This is libmicrohttpd.info, produced by makeinfo version 5.2 from
libmicrohttpd.texi.
This manual is for GNU libmicrohttpd (version 0.9.42, 3 April 2015), a
library for embedding an HTTP(S) server into C applications.
Copyright (C) 2007-2013 Christian Grothoff
Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License,
Version 1.3 or any later version published by the Free Software
Foundation; with no Invariant Sections, no Front-Cover Texts, and
no Back-Cover Texts. A copy of the license is included in the
section entitled "GNU Free Documentation License".
INFO-DIR-SECTION Software libraries
START-INFO-DIR-ENTRY
* libmicrohttpd: (libmicrohttpd). Embedded HTTP server library.
END-INFO-DIR-ENTRY
File: libmicrohttpd.info, Node: Top, Next: microhttpd-intro, Up: (dir)
The GNU libmicrohttpd Library
*****************************
This manual is for GNU libmicrohttpd (version 0.9.42, 3 April 2015), a
library for embedding an HTTP(S) server into C applications.
Copyright (C) 2007-2013 Christian Grothoff
Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License,
Version 1.3 or any later version published by the Free Software
Foundation; with no Invariant Sections, no Front-Cover Texts, and
no Back-Cover Texts. A copy of the license is included in the
section entitled "GNU Free Documentation License".
* Menu:
* microhttpd-intro:: Introduction.
* microhttpd-const:: Constants.
* microhttpd-struct:: Structures type definition.
* microhttpd-cb:: Callback functions definition.
* microhttpd-init:: Starting and stopping the server.
* microhttpd-inspect:: Implementing external 'select'.
* microhttpd-requests:: Handling requests.
* microhttpd-responses:: Building responses to requests.
* microhttpd-flow:: Flow control.
* microhttpd-dauth:: Utilizing Authentication.
* microhttpd-post:: Adding a 'POST' processor.
* microhttpd-info:: Obtaining and modifying status information.
* microhttpd-util:: Utilities.
Appendices
* GNU-LGPL:: The GNU Lesser General Public License says how you
can copy and share almost all of 'libmicrohttpd'.
* GNU GPL with eCos Extension:: The GNU General Public License with eCos extension says how you
can copy and share some parts of 'libmicrohttpd'.
* GNU-FDL:: The GNU Free Documentation License says how you
can copy and share the documentation of 'libmicrohttpd'.
Indices
* Concept Index:: Index of concepts and programs.
* Function and Data Index:: Index of functions, variables and data types.
* Type Index:: Index of data types.
File: libmicrohttpd.info, Node: microhttpd-intro, Next: microhttpd-const, Prev: Top, Up: Top
1 Introduction
**************
All symbols defined in the public API start with 'MHD_'. MHD is a small
HTTP daemon library. As such, it does not have any API for logging
errors (you can only enable or disable logging to stderr). Also, it may
not support all of the HTTP features directly, where applicable,
portions of HTTP may have to be handled by clients of the library.
The library is supposed to handle everything that it must handle
(because the API would not allow clients to do this), such as basic
connection management; however, detailed interpretations of headers --
such as range requests -- and HTTP methods are left to clients. The
library does understand 'HEAD' and will only send the headers of the
response and not the body, even if the client supplied a body. The
library also understands headers that control connection management
(specifically, 'Connection: close' and 'Expect: 100 continue' are
understood and handled automatically).
MHD understands 'POST' data and is able to decode certain formats (at
the moment only 'application/x-www-form-urlencoded' and
'multipart/form-data') using the post processor API. The data stream of
a POST is also provided directly to the main application, so unsupported
encodings could still be processed, just not conveniently by MHD.
The header file defines various constants used by the HTTP protocol.
This does not mean that MHD actually interprets all of these values.
The provided constants are exported as a convenience for users of the
library. MHD does not verify that transmitted HTTP headers are part of
the standard specification; users of the library are free to define
their own extensions of the HTTP standard and use those with MHD.
All functions are guaranteed to be completely reentrant and
thread-safe. MHD checks for allocation failures and tries to recover
gracefully (for example, by closing the connection). Additionally,
clients can specify resource limits on the overall number of
connections, number of connections per IP address and memory used per
connection to avoid resource exhaustion.
1.1 Scope
=========
MHD is currently used in a wide range of implementations. Examples
based on reports we've received from developers include:
* Embedded HTTP server on a cortex M3 (128 KB code space)
* Large-scale multimedia server (reportedly serving at the simulator
limit of 7.5 GB/s)
* Administrative console (via HTTP/HTTPS) for network appliances
1.2 Thread modes and event loops
================================
MHD supports four basic thread modes and up to three event loop styes.
The four basic thread modes are external (MHD creates no threads,
event loop is fully managed by the application), internal (MHD creates
one thread for all connections), thread pool (MHD creates a thread pool
which is used to process all connections) and thread-per-connection (MHD
creates one listen thread and then one thread per accepted connection).
These thread modes are then combined with the event loop styles. MHD
support select, poll and epoll. epoll is only available on Linux, poll
may not be available on some platforms. Note that it is possible to
combine MHD using epoll with an external select-based event loop.
The default (if no other option is passed) is "external select". The
highest performance can typically be obtained with a thread pool using
'epoll'. Apache Benchmark (ab) was used to compare the performance of
'select' and 'epoll' when using a thread pool and a large number of
connections. *note Figure 1.1: fig:performance. shows the resulting
plot from the 'benchmark.c' example, which measures the latency between
an incoming request and the completion of the transmission of the
response. In this setting, the 'epoll' thread pool with four threads
was able to handle more than 45,000 connections per second on loopback
(with Apache Benchmark running three processes on the same machine).
[image src="performance_data.png" alt="Data" ]
Figure 1.1: Performance measurements for select vs. epoll (with
thread-pool).
Not all combinations of thread modes and event loop styles are
supported. This is partially to keep the API simple, and partially
because some combinations simply make no sense as others are strictly
superior. Note that the choice of style depends fist of all on the
application logic, and then on the performance requirements.
Applications that perform a blocking operation while handling a request
within the callbacks from MHD must use a thread per connection. This is
typically rather costly. Applications that do not support threads or
that must run on embedded devices without thread-support must use the
external mode. Using 'epoll' is only supported on Linux, thus portable
applications must at least have a fallback option available. *note
Table 1.1: tbl:supported. lists the sane combinations.
select poll epoll
external yes no yes
internal yes yes yes
thread pool yes yes yes
thread-per-connection yes yes no
Table 1.1: Supported combinations of event styles and thread modes.
1.3 Compiling GNU libmicrohttpd
===============================
MHD uses the standard GNU system where the usual build process involves
running
$ ./configure
$ make
$ make install
MHD supports various options to be given to configure to tailor the
binary to a specific situation. Note that some of these options will
remove portions of the MHD code that are required for
binary-compatibility. They should only be used on embedded systems with
tight resource constraints and no concerns about library versioning.
Standard distributions including MHD are expected to always ship with
all features enabled, otherwise unexpected incompatibilities can arise!
Here is a list of MHD-specific options that can be given to configure
(canonical configure options such as "-prefix" are also supported, for a
full list of options run "./configure -help"):
'``--disable-curl'''
disable running testcases using libcurl
'``--disable-largefile'''
disable support for 64-bit files
'``--disable-messages'''
disable logging of error messages (smaller binary size, not so much
fun for debugging)
'``--disable-https'''
disable HTTPS support, even if GNUtls is found; this option must be
used if eCOS license is desired as an option (in all cases the
resulting binary falls under a GNU LGPL-only license)
'``--disable-postprocessor'''
do not include the post processor API (results in binary
incompatibility)
'``--disable-dauth'''
do not include the authentication APIs (results in binary
incompatibility)
'``--disable-epoll'
do not include epoll support, even on Linux (minimally smaller
binary size, good for testing portability to non-Linux systems)
'``--enable-coverage'''
set flags for analysis of code-coverage with gcc/gcov (results in
slow, large binaries)
'``--with-gcrypt=PATH'''
specifies path to libgcrypt installation
'``--with-gnutls=PATH'''
specifies path to libgnutls installation
1.4 Validity of pointers
========================
MHD will give applications access to its internal data structures via
pointers via arguments and return values from its API. This creates the
question as to how long those pointers are assured to stay valid.
Most MHD data structures are associated with the connection of an
HTTP client. Thus, pointers associated with a connection are typically
valid until the connection is finished, at which point MHD will call the
'MHD_RequestCompletedCallback' if one is registered. Applications that
have such a callback registered may assume that keys and values from the
'MHD_KeyValueIterator', return values from 'MHD_lookup_connection_value'
and the 'url', 'method' and 'version' arguments to the
'MHD_AccessHandlerCallback' will remain valid until the respective
'MHD_RequestCompletedCallback' is invoked.
In contrast, the 'upload_data' argument of
'MHD_RequestCompletedCallback' as well as all pointers from the
'MHD_PostDataIterator' are only valid for the duration of the callback.
Pointers returned from 'MHD_get_response_header' are valid as long as
the response itself is valid.
1.5 Including the microhttpd.h header
=====================================
Ideally, before including "microhttpd.h" you should add the necessary
includes to define the 'uint64_t', 'size_t', 'fd_set', 'socklen_t' and
'struct sockaddr' data types. Which specific headers are needed may
depend on your platform and your build system might include some tests
to provide you with the necessary conditional operations. For possible
suggestions consult 'platform.h' and 'configure.ac' in the MHD
distribution.
Once you have ensured that you manually (!) included the right
headers for your platform before "microhttpd.h", you should also add a
line with '#define MHD_PLATFORM_H' which will prevent the "microhttpd.h"
header from trying (and, depending on your platform, failing) to include
the right headers.
If you do not define MHD_PLATFORM_H, the "microhttpd.h" header will
automatically include headers needed on GNU/Linux systems (possibly
causing problems when porting to other platforms).
1.6 SIGPIPE
===========
MHD does not install a signal handler for SIGPIPE. On platforms where
this is possible (such as GNU/Linux), it disables SIGPIPE for its I/O
operations (by passing MSG_NOSIGNAL). On other platforms, SIGPIPE
signals may be generated from network operations by MHD and will cause
the process to die unless the developer explicitly installs a signal
handler for SIGPIPE.
Hence portable code using MHD must install a SIGPIPE handler or
explicitly block the SIGPIPE signal. MHD does not do so in order to
avoid messing with other parts of the application that may need to
handle SIGPIPE in a particular way. You can make your application
handle SIGPIPE by calling the following function in 'main':
static void
catcher (int sig)
{
}
static void
ignore_sigpipe ()
{
struct sigaction oldsig;
struct sigaction sig;
sig.sa_handler = &catcher;
sigemptyset (&sig.sa_mask);
#ifdef SA_INTERRUPT
sig.sa_flags = SA_INTERRUPT; /* SunOS */
#else
sig.sa_flags = SA_RESTART;
#endif
if (0 != sigaction (SIGPIPE, &sig, &oldsig))
fprintf (stderr,
"Failed to install SIGPIPE handler: %s\n", strerror (errno));
}
1.7 MHD_UNSIGNED_LONG_LONG
==========================
Some platforms do not support 'long long'. Hence MHD defines a macro
'MHD_UNSIGNED LONG_LONG' which will default to 'unsigned long long'.
For standard desktop operating systems, this is all you need to know.
However, if your platform does not support 'unsigned long long', you
should change "platform.h" to define 'MHD_LONG_LONG' and
'MHD_UNSIGNED_LONG_LONG' to an appropriate alternative type and also
define 'MHD_LONG_LONG_PRINTF' and 'MHD_UNSIGNED_LONG_LONG_PRINTF' to the
corresponding format string for printing such a data type. Note that
the "signed" versions are deprecated. Also, for historical reasons,
'MHD_LONG_LONG_PRINTF' is without the percent sign, whereas
'MHD_UNSIGNED_LONG_LONG_PRINTF' is with the percent sign. Newly written
code should only use the unsigned versions. However, you need to define
both in "platform.h" if you need to change the definition for the
specific platform.
1.8 Portability to W32
======================
libmicrohttpd in general ported well to W32. Most libmicrohttpd
features are supported. W32 do not support some functions, like epoll
and corresponding MHD features are not available on W32.
1.9 Portability to z/OS
=======================
To compile MHD on z/OS, extract the archive and run
iconv -f UTF-8 -t IBM-1047 contrib/ascebc > /tmp/ascebc.sh
chmod +x /tmp/ascebc.sh
for n in `find * -type f`
do
/tmp/ascebc.sh $n
done
to convert all source files to EBCDIC. Note that you must run
'configure' from the directory where the configure script is located.
Otherwise, configure will fail to find the 'contrib/xcc' script (which
is a wrapper around the z/OS c89 compiler).
File: libmicrohttpd.info, Node: microhttpd-const, Next: microhttpd-struct, Prev: microhttpd-intro, Up: Top
2 Constants
***********
-- Enumeration: MHD_FLAG
Options for the MHD daemon.
Note that if neither 'MHD_USE_THREAD_PER_CONNECTION' nor
'MHD_USE_SELECT_INTERNALLY' is used, the client wants control over
the process and will call the appropriate microhttpd callbacks.
Starting the daemon may also fail if a particular option is not
implemented or not supported on the target platform (i.e. no
support for SSL, threads or IPv6). SSL support generally depends
on options given during MHD compilation. Threaded operations
(including 'MHD_USE_SELECT_INTERNALLY') are not supported on
Symbian.
'MHD_NO_FLAG'
No options selected.
'MHD_USE_DEBUG'
Run in debug mode. If this flag is used, the library should
print error messages and warnings to stderr. Note that for
this run-time option to have any effect, MHD needs to be
compiled with messages enabled. This is done by default
except you ran configure with the '--disable-messages' flag
set.
'MHD_USE_SSL'
Run in HTTPS-mode. If you specify 'MHD_USE_SSL' and MHD was
compiled without SSL support, 'MHD_start_daemon' will return
NULL.
'MHD_USE_THREAD_PER_CONNECTION'
Run using one thread per connection.
'MHD_USE_SELECT_INTERNALLY'
Run using an internal thread doing 'SELECT'.
'MHD_USE_IPv6'
Run using the IPv6 protocol (otherwise, MHD will just support
IPv4). If you specify 'MHD_USE_IPV6' and the local platform
does not support it, 'MHD_start_daemon' will return NULL.
If you want MHD to support IPv4 and IPv6 using a single
socket, pass MHD_USE_DUAL_STACK, otherwise, if you only pass
this option, MHD will try to bind to IPv6-only (resulting in
no IPv4 support).
'MHD_USE_DUAL_STACK'
Use a single socket for IPv4 and IPv6. Note that this will
mean that IPv4 addresses are returned by MHD in the
IPv6-mapped format (the 'struct sockaddr_in6' format will be
used for IPv4 and IPv6).
'MHD_USE_PEDANTIC_CHECKS'
Be pedantic about the protocol (as opposed to as tolerant as
possible). Specifically, at the moment, this flag causes MHD
to reject HTTP 1.1 connections without a 'Host' header. This
is required by the standard, but of course in violation of the
"be as liberal as possible in what you accept" norm. It is
recommended to turn this *ON* if you are testing clients
against MHD, and *OFF* in production.
'MHD_USE_POLL'
Use poll instead of select. This allows sockets with
descriptors '>= FD_SETSIZE'. This option currently only works
in conjunction with 'MHD_USE_THREAD_PER_CONNECTION' or
'MHD_USE_INTERNAL_SELECT' (at this point). If you specify
'MHD_USE_POLL' and the local platform does not support it,
'MHD_start_daemon' will return NULL.
'MHD_USE_EPOLL_LINUX_ONLY'
Use epoll instead of poll or select. This allows sockets with
descriptors '>= FD_SETSIZE'. This option is only available on
Linux systems and only works in conjunction with
'MHD_USE_THREAD_PER_CONNECTION' (at this point). If you
specify 'MHD_USE_EPOLL_LINUX_ONLY' and the local platform does
not support it, 'MHD_start_daemon' will return NULL. Using
epoll instead of select or poll can in some situations result
in significantly higher performance as the system call has
fundamentally lower complexity (O(1) for epoll vs. O(n) for
select/poll where n is the number of open connections).
'MHD_SUPPRESS_DATE_NO_CLOCK'
Suppress (automatically) adding the 'Date:' header to HTTP
responses. This option should ONLY be used on systems that do
not have a clock and that DO provide other mechanisms for
cache control. See also RFC 2616, section 14.18 (exception
3).
'MHD_USE_NO_LISTEN_SOCKET'
Run the HTTP server without any listen socket. This option
only makes sense if 'MHD_add_connection' is going to be used
exclusively to connect HTTP clients to the HTTP server. This
option is incompatible with using a thread pool; if it is
used, 'MHD_OPTION_THREAD_POOL_SIZE' is ignored.
'MHD_USE_PIPE_FOR_SHUTDOWN'
Force MHD to use a signal pipe to notify the event loop (of
threads) of our shutdown. This is required if an appliction
uses 'MHD_USE_INTERNAL_SELECT' or
'MHD_USE_THREAD_PER_CONNECTION' and then performs
'MHD_quiesce_daemon' (which eliminates our ability to signal
termination via the listen socket). In these modes,
'MHD_quiesce_daemon' will fail if this option was not set.
Also, use of this option is automatic (as in, you do not even
have to specify it), if 'MHD_USE_NO_LISTEN_SOCKET' is
specified. In "external" select mode, this option is always
simply ignored.
'MHD_USE_SUSPEND_RESUME'
Enables using 'MHD_suspend_connection' and
'MHD_resume_connection', as performing these calls requires
some additional pipes to be created, and code not using these
calls should not pay the cost.
'MHD_USE_TCP_FASTOPEN'
Enable TCP_FASTOPEN on the listen socket. TCP_FASTOPEN is
currently supported on Linux >= 3.6. On other systems using
this option with cause 'MHD_start_daemon' to fail.
-- Enumeration: MHD_OPTION
MHD options. Passed in the varargs portion of
'MHD_start_daemon()'.
'MHD_OPTION_END'
No more options / last option. This is used to terminate the
VARARGs list.
'MHD_OPTION_CONNECTION_MEMORY_LIMIT'
Maximum memory size per connection (followed by a 'size_t').
The default is 32 kB (32*1024 bytes) as defined by the
internal constant 'MHD_POOL_SIZE_DEFAULT'. Values above 128k
are unlikely to result in much benefit, as half of the memory
will be typically used for IO, and TCP buffers are unlikely to
support window sizes above 64k on most systems.
'MHD_OPTION_CONNECTION_MEMORY_INCREMENT'
Increment to use for growing the read buffer (followed by a
'size_t'). The default is 1024 (bytes). Increasing this
value will make MHD use memory for reading more aggressively,
which can reduce the number of 'recvfrom' calls but may
increase the number of 'sendto' calls. The given value must
fit within MHD_OPTION_CONNECTION_MEMORY_LIMIT.
'MHD_OPTION_CONNECTION_LIMIT'
Maximum number of concurrent connections to accept (followed
by an 'unsigned int'). The default is 'FD_SETSIZE - 4' (the
maximum number of file descriptors supported by 'select' minus
four for 'stdin', 'stdout', 'stderr' and the server socket).
In other words, the default is as large as possible.
Note that if you set a low connection limit, you can easily
get into trouble with browsers doing request pipelining. For
example, if your connection limit is "1", a browser may open a
first connection to access your "index.html" file, keep it
open but use a second connection to retrieve CSS files, images
and the like. In fact, modern browsers are typically by
default configured for up to 15 parallel connections to a
single server. If this happens, MHD will refuse to even
accept the second connection until the first connection is
closed -- which does not happen until timeout. As a result,
the browser will fail to render the page and seem to hang. If
you expect your server to operate close to the connection
limit, you should first consider using a lower timeout value
and also possibly add a "Connection: close" header to your
response to ensure that request pipelining is not used and
connections are closed immediately after the request has
completed:
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONNECTION,
"close");
'MHD_OPTION_CONNECTION_TIMEOUT'
After how many seconds of inactivity should a connection
automatically be timed out? (followed by an 'unsigned int';
use zero for no timeout). The default is zero (no timeout).
'MHD_OPTION_NOTIFY_COMPLETED'
Register a function that should be called whenever a request
has been completed (this can be used for application-specific
clean up). Requests that have never been presented to the
application (via 'MHD_AccessHandlerCallback()') will not
result in notifications.
This option should be followed by *TWO* pointers. First a
pointer to a function of type 'MHD_RequestCompletedCallback()'
and second a pointer to a closure to pass to the request
completed callback. The second pointer maybe 'NULL'.
'MHD_OPTION_NOTIFY_CONNECTION'
Register a function that should be called when the TCP
connection to a client is opened or closed. Note that
'MHD_OPTION_NOTIFY_COMPLETED' and the 'con_cls' argument to
the 'MHD_AccessHandlerCallback' are per HTTP request (and
there can be multiple HTTP requests per TCP connection). The
registered callback is called twice per TCP connection, with
'MHD_CONNECTION_NOTIFY_STARTED' and
'MHD_CONNECTION_NOTIFY_CLOSED' respectively. An additional
argument can be used to store TCP connection specific
information, which can be retrieved using
'MHD_CONNECTION_INFO_SOCKET_CONTEXT' during the lifetime of
the TCP connection. The respective location is not the same
as the HTTP-request-specific 'con_cls' from the
'MHD_AccessHandlerCallback'.
This option should be followed by *TWO* pointers. First a
pointer to a function of type 'MHD_NotifyConnectionCallback()'
and second a pointer to a closure to pass to the request
completed callback. The second pointer maybe 'NULL'.
'MHD_OPTION_PER_IP_CONNECTION_LIMIT'
Limit on the number of (concurrent) connections made to the
server from the same IP address. Can be used to prevent one
IP from taking over all of the allowed connections. If the
same IP tries to establish more than the specified number of
connections, they will be immediately rejected. The option
should be followed by an 'unsigned int'. The default is zero,
which means no limit on the number of connections from the
same IP address.
'MHD_OPTION_SOCK_ADDR'
Bind daemon to the supplied socket address. This option
should be followed by a 'struct sockaddr *'. If
'MHD_USE_IPv6' is specified, the 'struct sockaddr*' should
point to a 'struct sockaddr_in6', otherwise to a 'struct
sockaddr_in'. If this option is not specified, the daemon
will listen to incoming connections from anywhere. If you use
this option, the 'port' argument from 'MHD_start_daemon' is
ignored and the port from the given 'struct sockaddr *' will
be used instead.
'MHD_OPTION_URI_LOG_CALLBACK'
Specify a function that should be called before parsing the
URI from the client. The specified callback function can be
used for processing the URI (including the options) before it
is parsed. The URI after parsing will no longer contain the
options, which maybe inconvenient for logging. This option
should be followed by two arguments, the first one must be of
the form
void * my_logger(void * cls, const char * uri, struct MHD_Connection *con)
where the return value will be passed as '*con_cls' in calls
to the 'MHD_AccessHandlerCallback' when this request is
processed later; returning a value of 'NULL' has no special
significance; (however, note that if you return non-'NULL',
you can no longer rely on the first call to the access handler
having 'NULL == *con_cls' on entry) 'cls' will be set to the
second argument following MHD_OPTION_URI_LOG_CALLBACK.
Finally, 'uri' will be the 0-terminated URI of the request.
Note that during the time of this call, most of the
connection's state is not initialized (as we have not yet
parsed he headers). However, information about the connecting
client (IP, socket) is available.
'MHD_OPTION_HTTPS_MEM_KEY'
Memory pointer to the private key to be used by the HTTPS
daemon. This option should be followed by an "const char*"
argument. This should be used in conjunction with
'MHD_OPTION_HTTPS_MEM_CERT'.
'MHD_OPTION_HTTPS_KEY_PASSWORD'
Memory pointer to the password that decrypts the private key
to be used by the HTTPS daemon. This option should be
followed by an "const char*" argument. This should be used in
conjunction with 'MHD_OPTION_HTTPS_MEM_KEY'.
The password (or passphrase) is only used immediately during
'MHD_start_daemon()'. Thus, the application may want to erase
it from memory afterwards for additional security.
'MHD_OPTION_HTTPS_MEM_CERT'
Memory pointer to the certificate to be used by the HTTPS
daemon. This option should be followed by an "const char*"
argument. This should be used in conjunction with
'MHD_OPTION_HTTPS_MEM_KEY'.
'MHD_OPTION_HTTPS_MEM_TRUST'
Memory pointer to the CA certificate to be used by the HTTPS
daemon to authenticate and trust clients certificates. This
option should be followed by an "const char*" argument. The
presence of this option activates the request of certificate
to the client. The request to the client is marked optional,
and it is the responsibility of the server to check the
presence of the certificate if needed. Note that most
browsers will only present a client certificate only if they
have one matching the specified CA, not sending any
certificate otherwise.
'MHD_OPTION_HTTPS_CRED_TYPE'
Daemon credentials type. Either certificate or anonymous,
this option should be followed by one of the values listed in
"enum gnutls_credentials_type_t".
'MHD_OPTION_HTTPS_PRIORITIES'
SSL/TLS protocol version and ciphers. This option must be
followed by an "const char *" argument specifying the SSL/TLS
protocol versions and ciphers that are acceptable for the
application. The string is passed unchanged to
gnutls_priority_init. If this option is not specified,
"NORMAL" is used.
'MHD_OPTION_HTTPS_CERT_CALLBACK'
Use a callback to determine which X.509 certificate should be
used for a given HTTPS connection. This option should be
followed by a argument of type
"gnutls_certificate_retrieve_function2 *". This option
provides an alternative to MHD_OPTION_HTTPS_MEM_KEY and
MHD_OPTION_HTTPS_MEM_CERT. You must use this version if
multiple domains are to be hosted at the same IP address using
TLS's Server Name Indication (SNI) extension. In this case,
the callback is expected to select the correct certificate
based on the SNI information provided. The callback is
expected to access the SNI data using
gnutls_server_name_get(). Using this option requires GnuTLS
3.0 or higher.
'MHD_OPTION_DIGEST_AUTH_RANDOM'
Digest Authentication nonce's seed.
This option should be followed by two arguments. First an
integer of type "size_t" which specifies the size of the
buffer pointed to by the second argument in bytes. Note that
the application must ensure that the buffer of the second
argument remains allocated and unmodified while the daemon is
running. For security, you SHOULD provide a fresh random
nonce when using MHD with Digest Authentication.
'MHD_OPTION_NONCE_NC_SIZE'
Size of an array of nonce and nonce counter map. This option
must be followed by an "unsigned int" argument that have the
size (number of elements) of a map of a nonce and a
nonce-counter. If this option is not specified, a default
value of 4 will be used (which might be too small for servers
handling many requests). If you do not use digest
authentication at all, you can specify a value of zero to save
some memory.
You should calculate the value of NC_SIZE based on the number
of connections per second multiplied by your expected session
duration plus a factor of about two for hash table collisions.
For example, if you expect 100 digest-authenticated
connections per second and the average user to stay on your
site for 5 minutes, then you likely need a value of about
60000. On the other hand, if you can only expect only 10
digest-authenticated connections per second, tolerate browsers
getting a fresh nonce for each request and expect a HTTP
request latency of 250 ms, then a value of about 5 should be
fine.
'MHD_OPTION_LISTEN_SOCKET'
Listen socket to use. Pass a listen socket for MHD to use
(systemd-style). If this option is used, MHD will not open
its own listen socket(s). The argument passed must be of type
"int" and refer to an existing socket that has been bound to a
port and is listening.
'MHD_OPTION_EXTERNAL_LOGGER'
Use the given function for logging error messages. This
option must be followed by two arguments; the first must be a
pointer to a function of type 'void fun(void * arg, const char
* fmt, va_list ap)' and the second a pointer of type 'void*'
which will be passed as the "arg" argument to "fun".
Note that MHD will not generate any log messages without the
MHD_USE_DEBUG flag set and if MHD was compiled with the
"-disable-messages" flag.
'MHD_OPTION_THREAD_POOL_SIZE'
Number (unsigned int) of threads in thread pool. Enable
thread pooling by setting this value to to something greater
than 1. Currently, thread model must be
MHD_USE_SELECT_INTERNALLY if thread pooling is enabled
('MHD_start_daemon' returns 'NULL' for an unsupported thread
model).
'MHD_OPTION_ARRAY'
This option can be used for initializing MHD using options
from an array. A common use for this is writing an FFI for
MHD. The actual options given are in an array of 'struct
MHD_OptionItem', so this option requires a single argument of
type 'struct MHD_OptionItem'. The array must be terminated
with an entry 'MHD_OPTION_END'.
An example for code using MHD_OPTION_ARRAY is:
struct MHD_OptionItem ops[] = {
{ MHD_OPTION_CONNECTION_LIMIT, 100, NULL },
{ MHD_OPTION_CONNECTION_TIMEOUT, 10, NULL },
{ MHD_OPTION_END, 0, NULL }
};
d = MHD_start_daemon(0, 8080, NULL, NULL, dh, NULL,
MHD_OPTION_ARRAY, ops,
MHD_OPTION_END);
For options that expect a single pointer argument, the second
member of the 'struct MHD_OptionItem' is ignored. For options
that expect two pointer arguments, the first argument must be
cast to 'intptr_t'.
'MHD_OPTION_UNESCAPE_CALLBACK'
Specify a function that should be called for unescaping escape
sequences in URIs and URI arguments. Note that this function
will NOT be used by the MHD_PostProcessor. If this option is
not specified, the default method will be used which decodes
escape sequences of the form "%HH". This option should be
followed by two arguments, the first one must be of the form
size_t my_unescaper(void * cls, struct MHD_Connection *c, char *s)
where the return value must be 'strlen(s)' and 's' should be
updated. Note that the unescape function must not lengthen
's' (the result must be shorter than the input and still be
0-terminated). 'cls' will be set to the second argument
following MHD_OPTION_UNESCAPE_CALLBACK.
'MHD_OPTION_THREAD_STACK_SIZE'
Maximum stack size for threads created by MHD. This option
must be followed by a 'size_t'). Not specifying this option
or using a value of zero means using the system default (which
is likely to differ based on your platform).
'MHD_OPTION_TCP_FASTQUEUE_QUEUE_SIZE'
When the flag 'MHD_USE_TCP_FASTOPEN' is used, this option sets
the connection handshake queue size for the TCP FASTOPEN
connections. Note that a TCP FASTOPEN connection handshake
occupies more resources than a TCP handshake as the SYN
packets also contain DATA which is kept in the associate state
until handshake is completed. If this option is not given the
queue size is set to a default value of 10. This option must
be followed by a 'unsigned int'.
'MHD_OPTION_HTTPS_MEM_DHPARAMS'
Memory pointer for the Diffie-Hellman parameters (dh.pem) to
be used by the HTTPS daemon for key exchange. This option
must be followed by a 'const char *' argument. The argument
would be a zero-terminated string with a PEM encoded PKCS3 DH
parameters structure suitable for passing to
'gnutls_dh_parms_import_pkcs3'.
'MHD_OPTION_LISTENING_ADDRESS_REUSE'
This option must be followed by a 'unsigned int' argument. If
this option is present and true (nonzero) parameter is given,
allow reusing the address:port of the listening socket (using
'SO_REUSEPORT' on most platforms, and 'SO_REUSEADDR' on
Windows). If a false (zero) parameter is given, disallow
reusing the the address:port of the listening socket (this
usually requires no special action, but 'SO_EXCLUSIVEADDRUSE'
is needed on Windows). If this option is not present, default
behaviour is undefined (currently, 'SO_REUSEADDR' is used on
all platforms, which disallows address:port reusing with the
exception of Windows).
-- C Struct: MHD_OptionItem
Entry in an MHD_OPTION_ARRAY. See the 'MHD_OPTION_ARRAY' option
argument for its use.
The 'option' member is used to specify which option is specified in
the array. The other members specify the respective argument.
Note that for options taking only a single pointer, the 'ptr_value'
member should be set. For options taking two pointer arguments,
the first pointer must be cast to 'intptr_t' and both the 'value'
and the 'ptr_value' members should be used to pass the two
pointers.
-- Enumeration: MHD_ValueKind
The 'MHD_ValueKind' specifies the source of the key-value pairs in
the HTTP protocol.
'MHD_RESPONSE_HEADER_KIND'
Response header.
'MHD_HEADER_KIND'
HTTP header.
'MHD_COOKIE_KIND'
Cookies. Note that the original HTTP header containing the
cookie(s) will still be available and intact.
'MHD_POSTDATA_KIND'
'POST' data. This is available only if a content encoding
supported by MHD is used (currently only URL encoding), and
only if the posted content fits within the available memory
pool. Note that in that case, the upload data given to the
'MHD_AccessHandlerCallback()' will be empty (since it has
already been processed).
'MHD_GET_ARGUMENT_KIND'
'GET' (URI) arguments.
'MHD_FOOTER_KIND'
HTTP footer (only for http 1.1 chunked encodings).
-- Enumeration: MHD_RequestTerminationCode
The 'MHD_RequestTerminationCode' specifies reasons why a request
has been terminated (or completed).
'MHD_REQUEST_TERMINATED_COMPLETED_OK'
We finished sending the response.
'MHD_REQUEST_TERMINATED_WITH_ERROR'
Error handling the connection (resources exhausted, other side
closed connection, application error accepting request, etc.)
'MHD_REQUEST_TERMINATED_TIMEOUT_REACHED'
No activity on the connection for the number of seconds
specified using 'MHD_OPTION_CONNECTION_TIMEOUT'.
'MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN'
We had to close the session since MHD was being shut down.
-- Enumeration: MHD_ResponseMemoryMode
The 'MHD_ResponeMemoryMode' specifies how MHD should treat the
memory buffer given for the response in
'MHD_create_response_from_buffer'.
'MHD_RESPMEM_PERSISTENT'
Buffer is a persistent (static/global) buffer that won't
change for at least the lifetime of the response, MHD should
just use it, not free it, not copy it, just keep an alias to
it.
'MHD_RESPMEM_MUST_FREE'
Buffer is heap-allocated with 'malloc' (or equivalent) and
should be freed by MHD after processing the response has
concluded (response reference counter reaches zero).
'MHD_RESPMEM_MUST_COPY'
Buffer is in transient memory, but not on the heap (for
example, on the stack or non-malloc allocated) and only valid
during the call to 'MHD_create_response_from_buffer'. MHD
must make its own private copy of the data for processing.
-- Enumeration: MHD_ResponseFlags
Response-specific flags. Passed as an argument to
'MHD_set_response_options()'.
'MHD_RF_NONE'
No special handling.
'MHD_RF_HTTP_VERSION_1_0_ONLY'
Only respond in conservative HTTP 1.0-mode. In particular, do
not (automatically) sent "Connection" headers and always close
the connection after generating the response.
-- Enumeration: MHD_ResponseOptions
Response-specific options. Passed in the varargs portion of
'MHD_set_response_options()'.
'MHD_RO_END'
No more options / last option. This is used to terminate the
VARARGs list.
File: libmicrohttpd.info, Node: microhttpd-struct, Next: microhttpd-cb, Prev: microhttpd-const, Up: Top
3 Structures type definition
****************************
-- C Struct: MHD_Daemon
Handle for the daemon (listening on a socket for HTTP traffic).
-- C Struct: MHD_Connection
Handle for a connection / HTTP request. With HTTP/1.1, multiple
requests can be run over the same connection. However, MHD will
only show one request per TCP connection to the client at any given
time.
-- C Struct: MHD_Response
Handle for a response.
-- C Struct: MHD_PostProcessor
Handle for 'POST' processing.
-- C Union: MHD_ConnectionInfo
Information about a connection.
-- C Union: MHD_DaemonInfo
Information about an MHD daemon.
File: libmicrohttpd.info, Node: microhttpd-cb, Next: microhttpd-init, Prev: microhttpd-struct, Up: Top
4 Callback functions definition
*******************************
-- Function Pointer: int *MHD_AcceptPolicyCallback (void *cls, const
struct sockaddr * addr, socklen_t addrlen)
Invoked in the context of a connection to allow or deny a client to
connect. This callback return 'MHD_YES' if connection is allowed,
'MHD_NO' if not.
CLS
custom value selected at callback registration time;
ADDR
address information from the client;
ADDRLEN
length of the address information.
-- Function Pointer: int *MHD_AccessHandlerCallback (void *cls, struct
MHD_Connection * connection, const char *url, const char
*method, const char *version, const char *upload_data, size_t
*upload_data_size, void **con_cls)
Invoked in the context of a connection to answer a request from the
client. This callback must call MHD functions (example: the
'MHD_Response' ones) to provide content to give back to the client
and return an HTTP status code (i.e. '200' for OK, '404', etc.).
*note microhttpd-post::, for details on how to code this callback.
Must return 'MHD_YES' if the connection was handled successfully,
'MHD_NO' if the socket must be closed due to a serious error while
handling the request
CLS
custom value selected at callback registration time;
URL
the URL requested by the client;
METHOD
the HTTP method used by the client ('GET', 'PUT', 'DELETE',
'POST', etc.);
VERSION
the HTTP version string (i.e. 'HTTP/1.1');
UPLOAD_DATA
the data being uploaded (excluding headers):
'POST' data *will* be made available incrementally in
UPLOAD_DATA; even if 'POST' data is available, the first time
the callback is invoked there won't be upload data, as this is
done just after MHD parses the headers. If supported by the
client and the HTTP version, the application can at this point
queue an error response to possibly avoid the upload entirely.
If no response is generated, MHD will (if required)
automatically send a 100 CONTINUE reply to the client.
Afterwards, POST data will be passed to the callback to be
processed incrementally by the application. The application
may return 'MHD_NO' to forcefully terminate the TCP connection
without generating a proper HTTP response. Once all of the
upload data has been provided to the application, the
application will be called again with 0 bytes of upload data.
At this point, a response should be queued to complete the
handling of the request.
UPLOAD_DATA_SIZE
set initially to the size of the UPLOAD_DATA provided; this
callback must update this value to the number of bytes *NOT*
processed; unless external select is used, the callback maybe
required to process at least some data. If the callback fails
to process data in multi-threaded or internal-select mode and
if the read-buffer is already at the maximum size that MHD is
willing to use for reading (about half of the maximum amount
of memory allowed for the connection), then MHD will abort
handling the connection and return an internal server error to
the client. In order to avoid this, clients must be able to
process upload data incrementally and reduce the value of
'upload_data_size'.
CON_CLS
reference to a pointer, initially set to 'NULL', that this
callback can set to some address and that will be preserved by
MHD for future calls for this request;
since the access handler may be called many times (i.e., for a
'PUT'/'POST' operation with plenty of upload data) this allows
the application to easily associate some request-specific
state;
if necessary, this state can be cleaned up in the global
'MHD_RequestCompletedCallback' (which can be set with the
'MHD_OPTION_NOTIFY_COMPLETED').
-- Function Pointer: void *MHD_RequestCompletedCallback (void *cls,
struct MHD_Connectionconnection, void **con_cls, enum
MHD_RequestTerminationCode toe)
Signature of the callback used by MHD to notify the application
about completed requests.
CLS
custom value selected at callback registration time;
CONNECTION
connection handle;
CON_CLS
value as set by the last call to the
'MHD_AccessHandlerCallback';
TOE
reason for request termination see
'MHD_OPTION_NOTIFY_COMPLETED'.
-- Function Pointer: int *MHD_KeyValueIterator (void *cls, enum
MHD_ValueKind kind, const char *key, const char *value)
Iterator over key-value pairs. This iterator can be used to
iterate over all of the cookies, headers, or 'POST'-data fields of
a request, and also to iterate over the headers that have been
added to a response.
CLS
custom value specified when iteration was triggered;
KIND
kind of the header we are looking at
KEY
key for the value, can be an empty string
VALUE
value corresponding value, can be NULL
Return 'MHD_YES' to continue iterating, 'MHD_NO' to abort the
iteration.
-- Function Pointer: int *MHD_ContentReaderCallback (void *cls,
uint64_t pos, char *buf, size_t max)
Callback used by MHD in order to obtain content. The callback has
to copy at most MAX bytes of content into BUF. The total number of
bytes that has been placed into BUF should be returned.
Note that returning zero will cause MHD to try again. Thus,
returning zero should only be used in conjunction with
'MHD_suspend_connection()' to avoid busy waiting.
While usually the callback simply returns the number of bytes
written into BUF, there are two special return value:
'MHD_CONTENT_READER_END_OF_STREAM' (-1) should be returned for the
regular end of transmission (with chunked encoding, MHD will then
terminate the chunk and send any HTTP footers that might be
present; without chunked encoding and given an unknown response
size, MHD will simply close the connection; note that while
returning 'MHD_CONTENT_READER_END_OF_STREAM' is not technically
legal if a response size was specified, MHD accepts this and treats
it just as 'MHD_CONTENT_READER_END_WITH_ERROR'.
'MHD_CONTENT_READER_END_WITH_ERROR' (-2) is used to indicate a
server error generating the response; this will cause MHD to simply
close the connection immediately. If a response size was given or
if chunked encoding is in use, this will indicate an error to the
client. Note, however, that if the client does not know a response
size and chunked encoding is not in use, then clients will not be
able to tell the difference between
'MHD_CONTENT_READER_END_WITH_ERROR' and
'MHD_CONTENT_READER_END_OF_STREAM'. This is not a limitation of
MHD but rather of the HTTP protocol.
CLS
custom value selected at callback registration time;
POS
position in the datastream to access; note that if an
'MHD_Response' object is re-used, it is possible for the same
content reader to be queried multiple times for the same data;
however, if an 'MHD_Response' is not re-used, MHD guarantees
that POS will be the sum of all non-negative return values
obtained from the content reader so far.
Return '-1' on error (MHD will no longer try to read content and
instead close the connection with the client).
-- Function Pointer: void *MHD_ContentReaderFreeCallback (void *cls)
This method is called by MHD if we are done with a content reader.
It should be used to free resources associated with the content
reader.
-- Function Pointer: int *MHD_PostDataIterator (void *cls, enum
MHD_ValueKind kind, const char *key, const char *filename,
const char *content_type, const char *transfer_encoding, const
char *data, uint64_t off, size_t size)
Iterator over key-value pairs where the value maybe made available
in increments and/or may not be zero-terminated. Used for
processing 'POST' data.
CLS
custom value selected at callback registration time;
KIND
type of the value;
KEY
zero-terminated key for the value;
FILENAME
name of the uploaded file, 'NULL' if not known;
CONTENT_TYPE
mime-type of the data, 'NULL' if not known;
TRANSFER_ENCODING
encoding of the data, 'NULL' if not known;
DATA
pointer to size bytes of data at the specified offset;
OFF
offset of data in the overall value;
SIZE
number of bytes in data available.
Return 'MHD_YES' to continue iterating, 'MHD_NO' to abort the
iteration.
File: libmicrohttpd.info, Node: microhttpd-init, Next: microhttpd-inspect, Prev: microhttpd-cb, Up: Top
5 Starting and stopping the server
**********************************
-- Function: void MHD_set_panic_func (MHD_PanicCallback cb, void *cls)
Set a handler for fatal errors.
CB
function to call if MHD encounters a fatal internal error. If
no handler was set explicitly, MHD will call 'abort'.
CLS
closure argument for cb; the other arguments are the name of
the source file, line number and a string describing the
nature of the fatal error (which can be 'NULL')
-- Function: struct MHD_Daemon * MHD_start_daemon (unsigned int flags,
unsigned short port, MHD_AcceptPolicyCallback apc, void
*apc_cls, MHD_AccessHandlerCallback dh, void *dh_cls, ...)
Start a webserver on the given port.
FLAGS
OR-ed combination of 'MHD_FLAG' values;
PORT
port to bind to;
APC
callback to call to check which clients will be allowed to
connect; you can pass 'NULL' in which case connections from
any IP will be accepted;
APC_CLS
extra argument to APC;
DH
default handler for all URIs;
DH_CLS
extra argument to DH.
Additional arguments are a list of options (type-value pairs,
terminated with 'MHD_OPTION_END'). It is mandatory to use
'MHD_OPTION_END' as last argument, even when there are no
additional arguments.
Return 'NULL' on error, handle to daemon on success.
-- Function: int MHD_quiesce_daemon (struct MHD_Daemon *daemon)
Stop accepting connections from the listening socket. Allows
clients to continue processing, but stops accepting new
connections. Note that the caller is responsible for closing the
returned socket; however, if MHD is run using threads (anything but
external select mode), it must not be closed until AFTER
'MHD_stop_daemon' has been called (as it is theoretically possible
that an existing thread is still using it).
This function is useful in the special case that a listen socket is
to be migrated to another process (i.e. a newer version of the
HTTP server) while existing connections should continue to be
processed until they are finished.
Return '-1' on error (daemon not listening), the handle to the
listen socket otherwise.
-- Function: void MHD_stop_daemon (struct MHD_Daemon *daemon)
Shutdown an HTTP daemon.
-- Function: int MHD_run (struct MHD_Daemon *daemon)
Run webserver operations (without blocking unless in client
callbacks). This method should be called by clients in combination
with 'MHD_get_fdset()' if the client-controlled 'select'-method is
used.
This function will work for external 'poll' and 'select' mode.
However, if using external 'select' mode, you may want to instead
use 'MHD_run_from_select', as it is more efficient.
DAEMON
daemon to process connections of
Return 'MHD_YES' on success, 'MHD_NO' if this daemon was not
started with the right options for this call.
-- Function: int MHD_run_from_select (struct MHD_Daemon *daemon, const
fd_set *read_fd_set, const fd_set *write_fd_set, const fd_set
*except_fd_set)
Run webserver operations given sets of ready socket handles.
This method should be called by clients in combination with
'MHD_get_fdset' if the client-controlled (external) select method
is used.
You can use this function instead of 'MHD_run' if you called
'select' on the result from 'MHD_get_fdset'. File descriptors in
the sets that are not controlled by MHD will be ignored. Calling
this function instead of 'MHD_run' is more efficient as MHD will
not have to call 'select' again to determine which operations are
ready.
DAEMON
daemon to process connections of
READ_FD_SET
set of descriptors that must be ready for reading without
blocking
WRITE_FD_SET
set of descriptors that must be ready for writing without
blocking
EXCEPT_FD_SET
ignored, can be NULL
Return 'MHD_YES' on success, 'MHD_NO' on serious internal errors.
-- Function: void MHD_add_connection (struct MHD_Daemon *daemon, int
client_socket, const struct sockaddr *addr, socklen_t addrlen)
Add another client connection to the set of connections managed by
MHD. This API is usually not needed (since MHD will accept inbound
connections on the server socket). Use this API in special cases,
for example if your HTTP server is behind NAT and needs to connect
out to the HTTP client, or if you are building a proxy.
If you use this API in conjunction with a internal select or a
thread pool, you must set the option 'MHD_USE_PIPE_FOR_SHUTDOWN' to
ensure that the freshly added connection is immediately processed
by MHD.
The given client socket will be managed (and closed!) by MHD after
this call and must no longer be used directly by the application
afterwards.
DAEMON
daemon that manages the connection
CLIENT_SOCKET
socket to manage (MHD will expect to receive an HTTP request
from this socket next).
ADDR
IP address of the client
ADDRLEN
number of bytes in addr
This function will return 'MHD_YES' on success, 'MHD_NO' if this
daemon could not handle the connection (i.e. malloc failed, etc).
The socket will be closed in any case; 'errno' is set to indicate
further details about the error.
File: libmicrohttpd.info, Node: microhttpd-inspect, Next: microhttpd-requests, Prev: microhttpd-init, Up: Top
6 Implementing external 'select'
********************************
-- Function: int MHD_get_fdset (struct MHD_Daemon *daemon, fd_set *
read_fd_set, fd_set * write_fd_set, fd_set * except_fd_set,
int *max_fd)
Obtain the 'select()' sets for this daemon. The daemon's socket is
added to READ_FD_SET. The list of currently existent connections
is scanned and their file descriptors added to the correct set.
After the call completed successfully: the variable referenced by
MAX_FD references the file descriptor with highest integer
identifier. The variable must be set to zero before invoking this
function.
Return 'MHD_YES' on success, 'MHD_NO' if: the arguments are invalid
(example: 'NULL' pointers); this daemon was not started with the
right options for this call.
-- Function: int MHD_get_timeout (struct MHD_Daemon *daemon, unsigned
long long *timeout)
Obtain timeout value for select for this daemon (only needed if
connection timeout is used). The returned value is how many
milliseconds 'select' should at most block, not the timeout value
set for connections. This function must not be called if the
'MHD_USE_THREAD_PER_CONNECTION' mode is in use (since then it is
not meaningful to ask for a timeout, after all, there is
concurrenct activity). The function must also not be called by
user-code if 'MHD_USE_INTERNAL_SELECT' is in use. In the latter
case, the behavior is undefined.
DAEMON
which daemon to obtain the timeout from.
TIMEOUT
will be set to the timeout (in milliseconds).
Return 'MHD_YES' on success, 'MHD_NO' if timeouts are not used (or
no connections exist that would necessiate the use of a timeout
right now).
File: libmicrohttpd.info, Node: microhttpd-requests, Next: microhttpd-responses, Prev: microhttpd-inspect, Up: Top
7 Handling requests
*******************
-- Function: int MHD_get_connection_values (struct MHD_Connection
*connection, enum MHD_ValueKind kind, MHD_KeyValueIterator
iterator, void *iterator_cls)
Get all the headers matching KIND from the request.
The ITERATOR callback is invoked once for each header, with
ITERATOR_CLS as first argument. After version 0.9.19, the headers
are iterated in the same order as they were received from the
network; previous versions iterated over the headers in reverse
order.
'MHD_get_connection_values' returns the number of entries iterated
over; this can be less than the number of headers if, while
iterating, ITERATOR returns 'MHD_NO'.
ITERATOR can be 'NULL': in this case this function just counts and
returns the number of headers.
In the case of 'MHD_GET_ARGUMENT_KIND', the VALUE argument will be
'NULL' if the URL contained a key without an equals operator. For
example, for a HTTP request to the URL "http://foo/bar?key", the
VALUE argument is 'NULL'; in contrast, a HTTP request to the URL
"http://foo/bar?key=", the VALUE argument is the empty string. The
normal case is that the URL contains "http://foo/bar?key=value" in
which case VALUE would be the string "value" and KEY would contain
the string "key".
-- Function: int MHD_set_connection_value (struct MHD_Connection
*connection, enum MHD_ValueKind kind, const char * key, const
char * value)
This function can be used to append an entry to the list of HTTP
headers of a connection (so that the 'MHD_get_connection_values
function' will return them - and the MHD PostProcessor will also
see them). This maybe required in certain situations (see Mantis
#1399) where (broken) HTTP implementations fail to supply values
needed by the post processor (or other parts of the application).
This function MUST only be called from within the
MHD_AccessHandlerCallback (otherwise, access maybe improperly
synchronized). Furthermore, the client must guarantee that the key
and value arguments are 0-terminated strings that are NOT freed
until the connection is closed. (The easiest way to do this is by
passing only arguments to permanently allocated strings.).
CONNECTION is the connection for which the entry for KEY of the
given KIND should be set to the given VALUE.
The function returns 'MHD_NO' if the operation could not be
performed due to insufficient memory and 'MHD_YES' on success.
-- Function: const char * MHD_lookup_connection_value (struct
MHD_Connection *connection, enum MHD_ValueKind kind, const
char *key)
Get a particular header value. If multiple values match the KIND,
return one of them (the "first", whatever that means). KEY must
reference a zero-terminated ASCII-coded string representing the
header to look for: it is compared against the headers using
'strcasecmp()', so case is ignored. A value of 'NULL' for KEY can
be used to lookup 'trailing' values without a key, for example if a
URI is of the form "http://example.com/?trailer", a KEY of 'NULL'
can be used to access "tailer" The function returns 'NULL' if no
matching item was found.
File: libmicrohttpd.info, Node: microhttpd-responses, Next: microhttpd-flow, Prev: microhttpd-requests, Up: Top
8 Building responses to requests
********************************
Response objects handling by MHD is asynchronous with respect to the
application execution flow. Instances of the 'MHD_Response' structure
are not associated to a daemon and neither to a client connection: they
are managed with reference counting.
In the simplest case: we allocate a new 'MHD_Response' structure for
each response, we use it once and finally we destroy it.
MHD allows more efficient resources usages.
Example: we allocate a new 'MHD_Response' structure for each response
*kind*, we use it every time we have to give that response and we
finally destroy it only when the daemon shuts down.
* Menu:
* microhttpd-response enqueue:: Enqueuing a response.
* microhttpd-response create:: Creating a response object.
* microhttpd-response headers:: Adding headers to a response.
* microhttpd-response options:: Setting response options.
* microhttpd-response inspect:: Inspecting a response object.
File: libmicrohttpd.info, Node: microhttpd-response enqueue, Next: microhttpd-response create, Up: microhttpd-responses
8.1 Enqueuing a response
========================
-- Function: int MHD_queue_response (struct MHD_Connection *connection,
unsigned int status_code, struct MHD_Response *response)
Queue a response to be transmitted to the client as soon as
possible but only after MHD_AccessHandlerCallback returns. This
function checks that it is legal to queue a response at this time
for the given connection. It also increments the internal
reference counter for the response object (the counter will be
decremented automatically once the response has been transmitted).
CONNECTION
the connection identifying the client;
STATUS_CODE
HTTP status code (i.e. '200' for OK);
RESPONSE
response to transmit.
Return 'MHD_YES' on success or if message has been queued. Return
'MHD_NO': if arguments are invalid (example: 'NULL' pointer); on
error (i.e. reply already sent).
-- Function: void MHD_destroy_response (struct MHD_Response *response)
Destroy a response object and associated resources (decrement the
reference counter). Note that MHD may keep some of the resources
around if the response is still in the queue for some clients, so
the memory may not necessarily be freed immediately.
An explanation of reference counting(1):
1. a 'MHD_Response' object is allocated:
struct MHD_Response * response = MHD_create_response_from_buffer(...);
/* here: reference counter = 1 */
2. the 'MHD_Response' object is enqueued in a 'MHD_Connection':
MHD_queue_response(connection, , response);
/* here: reference counter = 2 */
3. the creator of the response object discharges responsibility for
it:
MHD_destroy_response(response);
/* here: reference counter = 1 */
4. the daemon handles the connection sending the response's data to
the client then decrements the reference counter by calling
'MHD_destroy_response()': the counter's value drops to zero and the
'MHD_Response' object is released.
---------- Footnotes ----------
(1) Note to readers acquainted to the Tcl API: reference counting on
'MHD_Connection' structures is handled in the same way as Tcl handles
'Tcl_Obj' structures through 'Tcl_IncrRefCount()' and
'Tcl_DecrRefCount()'.
File: libmicrohttpd.info, Node: microhttpd-response create, Next: microhttpd-response headers, Prev: microhttpd-response enqueue, Up: microhttpd-responses
8.2 Creating a response object
==============================
-- Function: struct MHD_Response * MHD_create_response_from_callback
(uint64_t size, size_t block_size, MHD_ContentReaderCallback
crc, void *crc_cls, MHD_ContentReaderFreeCallback crfc)
Create a response object. The response object can be extended with
header information and then it can be used any number of times.
SIZE
size of the data portion of the response, '-1' for unknown;
BLOCK_SIZE
preferred block size for querying CRC (advisory only, MHD may
still call CRC using smaller chunks); this is essentially the
buffer size used for IO, clients should pick a value that is
appropriate for IO and memory performance requirements;
CRC
callback to use to obtain response data;
CRC_CLS
extra argument to CRC;
CRFC
callback to call to free CRC_CLS resources.
Return 'NULL' on error (i.e. invalid arguments, out of memory).
-- Function: struct MHD_Response * MHD_create_response_from_fd
(uint64_t size, int fd)
Create a response object. The response object can be extended with
header information and then it can be used any number of times.
SIZE
size of the data portion of the response (should be smaller or
equal to the size of the file)
FD
file descriptor referring to a file on disk with the data;
will be closed when response is destroyed; note that 'fd' must
be an actual file descriptor (not a pipe or socket) since MHD
might use 'sendfile' or 'seek' on it. The descriptor should
be in blocking-IO mode.
Return 'NULL' on error (i.e. invalid arguments, out of memory).
-- Function: struct MHD_Response *
MHD_create_response_from_fd_at_offset (size_t size, int fd,
off_t offset)
Create a response object. The response object can be extended with
header information and then it can be used any number of times.
Note that you need to be a bit careful about 'off_t' when writing
this code. Depending on your platform, MHD is likely to have been
compiled with support for 64-bit files. When you compile your own
application, you must make sure that 'off_t' is also a 64-bit
value. If not, your compiler may pass a 32-bit value as 'off_t',
which will result in 32-bits of garbage.
If you use the autotools, use the 'AC_SYS_LARGEFILE' autoconf macro
and make sure to include the generated 'config.h' file before
'microhttpd.h' to avoid problems. If you do not have a build
system and only want to run on a GNU/Linux system, you could also
use
#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <microhttpd.h>
to ensure 64-bit 'off_t'. Note that if your operating system does
not support 64-bit files, MHD will be compiled with a 32-bit
'off_t' (in which case the above would be wrong).
SIZE
size of the data portion of the response (number of bytes to
transmit from the file starting at offset).
FD
file descriptor referring to a file on disk with the data;
will be closed when response is destroyed; note that 'fd' must
be an actual file descriptor (not a pipe or socket) since MHD
might use 'sendfile' or 'seek' on it. The descriptor should
be in blocking-IO mode.
OFFSET
offset to start reading from in the file
Return 'NULL' on error (i.e. invalid arguments, out of memory).
-- Function: struct MHD_Response * MHD_create_response_from_buffer
(size_t size, void *data, enum MHD_ResponseMemoryMode mode)
Create a response object. The response object can be extended with
header information and then it can be used any number of times.
SIZE
size of the data portion of the response;
BUFFER
the data itself;
MODE
memory management options for buffer; use
MHD_RESPMEM_PERSISTENT if the buffer is static/global memory,
use MHD_RESPMEM_MUST_FREE if the buffer is heap-allocated and
should be freed by MHD and MHD_RESPMEM_MUST_COPY if the buffer
is in transient memory (i.e. on the stack) and must be copied
by MHD;
Return 'NULL' on error (i.e. invalid arguments, out of memory).
-- Function: struct MHD_Response * MHD_create_response_from_data
(size_t size, void *data, int must_free, int must_copy)
Create a response object. The response object can be extended with
header information and then it can be used any number of times.
This function is deprecated, use 'MHD_create_response_from_buffer'
instead.
SIZE
size of the data portion of the response;
DATA
the data itself;
MUST_FREE
if true: MHD should free data when done;
MUST_COPY
if true: MHD allocates a block of memory and use it to make a
copy of DATA embedded in the returned 'MHD_Response'
structure; handling of the embedded memory is responsibility
of MHD; DATA can be released anytime after this call returns.
Return 'NULL' on error (i.e. invalid arguments, out of memory).
Example: create a response from a statically allocated string:
const char * data = "<html><body><p>Error!</p></body></html>";
struct MHD_Connection * connection = ...;
struct MHD_Response * response;
response = MHD_create_response_from_buffer (strlen(data), data,
MHD_RESPMEM_PERSISTENT);
MHD_queue_response(connection, 404, response);
MHD_destroy_response(response);
File: libmicrohttpd.info, Node: microhttpd-response headers, Next: microhttpd-response options, Prev: microhttpd-response create, Up: microhttpd-responses
8.3 Adding headers to a response
================================
-- Function: int MHD_add_response_header (struct MHD_Response
*response, const char *header, const char *content)
Add a header line to the response. The strings referenced by
HEADER and CONTENT must be zero-terminated and they are duplicated
into memory blocks embedded in RESPONSE.
Notice that the strings must not hold newlines, carriage returns or
tab chars.
Return 'MHD_NO' on error (i.e. invalid header or content format or
memory allocation error).
-- Function: int MHD_add_response_footer (struct MHD_Response
*response, const char *footer, const char *content)
Add a footer line to the response. The strings referenced by
FOOTER and CONTENT must be zero-terminated and they are duplicated
into memory blocks embedded in RESPONSE.
Notice that the strings must not hold newlines, carriage returns or
tab chars. You can add response footers at any time before
signalling the end of the response to MHD (not just before calling
'MHD_queue_response'). Footers are useful for adding cryptographic
checksums to the reply or to signal errors encountered during data
generation. This call was introduced in MHD 0.9.3.
Return 'MHD_NO' on error (i.e. invalid header or content format or
memory allocation error).
-- Function: int MHD_del_response_header (struct MHD_Response
*response, const char *header, const char *content)
Delete a header (or footer) line from the response. Return
'MHD_NO' on error (arguments are invalid or no such header known).
File: libmicrohttpd.info, Node: microhttpd-response options, Next: microhttpd-response inspect, Prev: microhttpd-response headers, Up: microhttpd-responses
8.4 Setting response options
============================
-- Function: int MHD_set_response_options (struct MHD_Response
*response, enum MHD_ResponseFlags flags, ...)
Set special flags and options for a response.
Calling this functions sets the given flags and options for the
response.
RESPONSE
which response should be modified;
FLAGS
flags to set for the response;
Additional arguments are a list of options (type-value pairs,
terminated with 'MHD_RO_END'). It is mandatory to use 'MHD_RO_END'
as last argument, even when there are no additional arguments.
Return 'MHD_NO' on error, 'MHD_YES' on success.
File: libmicrohttpd.info, Node: microhttpd-response inspect, Prev: microhttpd-response options, Up: microhttpd-responses
8.5 Inspecting a response object
================================
-- Function: int MHD_get_response_headers (struct MHD_Response
*response, MHD_KeyValueIterator iterator, void *iterator_cls)
Get all of the headers added to a response.
Invoke the ITERATOR callback for each header in the response, using
ITERATOR_CLS as first argument. Return number of entries iterated
over. ITERATOR can be 'NULL': in this case the function just
counts headers.
ITERATOR should not modify the its key and value arguments, unless
we know what we are doing.
-- Function: const char * MHD_get_response_header (struct MHD_Response
*response, const char *key)
Find and return a pointer to the value of a particular header from
the response. KEY must reference a zero-terminated string
representing the header to look for. The search is case sensitive.
Return 'NULL' if header does not exist or KEY is 'NULL'.
We should not modify the value, unless we know what we are doing.
File: libmicrohttpd.info, Node: microhttpd-flow, Next: microhttpd-dauth, Prev: microhttpd-responses, Up: Top
9 Flow control.
***************
Sometimes it may be possible that clients upload data faster than an
application can process it, or that an application needs an extended
period of time to generate a response. If
'MHD_USE_THREAD_PER_CONNECTION' is used, applications can simply deal
with this by performing their logic within the thread and thus
effectively blocking connection processing by MHD. In all other modes,
blocking logic must not be placed within the callbacks invoked by MHD as
this would also block processing of other requests, as a single thread
may be responsible for tens of thousands of connections.
Instead, applications using thread modes other than
'MHD_USE_THREAD_PER_CONNECTION' should use the following functions to
perform flow control.
-- Function: int MHD_suspend_connection (struct MHD_Connection
*connection)
Suspend handling of network data for a given connection. This can
be used to dequeue a connection from MHD's event loop (external
select, internal select or thread pool; not applicable to
thread-per-connection!) for a while.
If you use this API in conjunction with a internal select or a
thread pool, you must set the option 'MHD_USE_SUSPEND_RESUME' to
ensure that a resumed connection is immediately processed by MHD.
Suspended connections continue to count against the total number of
connections allowed (per daemon, as well as per IP, if such limits
are set). Suspended connections will NOT time out; timeouts will
restart when the connection handling is resumed. While a
connection is suspended, MHD will not detect disconnects by the
client.
The only safe time to suspend a connection is from the
'MHD_AccessHandlerCallback'.
Finally, it is an API violation to call 'MHD_stop_daemon' while
having suspended connections (this will at least create memory and
socket leaks or lead to undefined behavior). You must explicitly
resume all connections before stopping the daemon.
CONNECTION
the connection to suspend
-- Function: int MHD_resume_connection (struct MHD_Connection
*connection)
Resume handling of network data for suspended connection. It is
safe to resume a suspended connection at any time. Calling this
function on a connection that was not previously suspended will
result in undefined behavior.
CONNECTION
the connection to resume
File: libmicrohttpd.info, Node: microhttpd-dauth, Next: microhttpd-post, Prev: microhttpd-flow, Up: Top
10 Utilizing Authentication
***************************
MHD support three types of client authentication.
Basic authentication uses a simple authentication method based on
BASE64 algorithm. Username and password are exchanged in clear between
the client and the server, so this method must only be used for
non-sensitive content or when the session is protected with https. When
using basic authentication MHD will have access to the clear password,
possibly allowing to create a chained authentication toward an external
authentication server.
Digest authentication uses a one-way authentication method based on
MD5 hash algorithm. Only the hash will transit over the network, hence
protecting the user password. The nonce will prevent replay attacks.
This method is appropriate for general use, especially when https is not
used to encrypt the session.
Client certificate authentication uses a X.509 certificate from the
client. This is the strongest authentication mechanism but it requires
the use of HTTPS. Client certificate authentication can be used
simultaneously with Basic or Digest Authentication in order to provide a
two levels authentication (like for instance separate machine and user
authentication). A code example for using client certificates is
presented in the MHD tutorial.
* Menu:
* microhttpd-dauth basic:: Using Basic Authentication.
* microhttpd-dauth digest:: Using Digest Authentication.
File: libmicrohttpd.info, Node: microhttpd-dauth basic, Next: microhttpd-dauth digest, Up: microhttpd-dauth
10.1 Using Basic Authentication
===============================
-- Function: char * MHD_basic_auth_get_username_password (struct
MHD_Connection *connection, char** password)
Get the username and password from the basic authorization header
sent by the client. Return 'NULL' if no username could be found, a
pointer to the username if found. If returned value is not 'NULL',
the value must be 'free()''ed.
PASSWORD reference a buffer to store the password. It can be
'NULL'. If returned value is not 'NULL', the value must be
'free()''ed.
-- Function: int MHD_queue_basic_auth_fail_response (struct
MHD_Connection *connection, const char *realm, struct
MHD_Response *response)
Queues a response to request basic authentication from the client.
Return 'MHD_YES' if successful, otherwise 'MHD_NO'.
REALM must reference to a zero-terminated string representing the
realm.
RESPONSE a response structure to specify what shall be presented to
the client with a 401 HTTP status.
File: libmicrohttpd.info, Node: microhttpd-dauth digest, Prev: microhttpd-dauth basic, Up: microhttpd-dauth
10.2 Using Digest Authentication
================================
-- Function: char * MHD_digest_auth_get_username (struct MHD_Connection
*connection)
Find and return a pointer to the username value from the request
header. Return 'NULL' if the value is not found or header does not
exist. If returned value is not 'NULL', the value must be
'free()''ed.
-- Function: int MHD_digest_auth_check (struct MHD_Connection
*connection, const char *realm, const char *username, const
char *password, unsigned int nonce_timeout)
Checks if the provided values in the WWW-Authenticate header are
valid and sound according to RFC2716. If valid return 'MHD_YES',
otherwise return 'MHD_NO'.
REALM must reference to a zero-terminated string representing the
realm.
USERNAME must reference to a zero-terminated string representing
the username, it is usually the returned value from
MHD_digest_auth_get_username.
PASSWORD must reference to a zero-terminated string representing
the password, most probably it will be the result of a lookup of
the username against a local database.
NONCE_TIMEOUT is the amount of time in seconds for a nonce to be
invalid. Most of the time it is sound to specify 300 seconds as
its values.
-- Function: int MHD_queue_auth_fail_response (struct MHD_Connection
*connection, const char *realm, const char *opaque, struct
MHD_Response *response, int signal_stale)
Queues a response to request authentication from the client, return
'MHD_YES' if successful, otherwise 'MHD_NO'.
REALM must reference to a zero-terminated string representing the
realm.
OPAQUE must reference to a zero-terminated string representing a
value that gets passed to the client and expected to be passed
again to the server as-is. This value can be a hexadecimal or
base64 string.
RESPONSE a response structure to specify what shall be presented to
the client with a 401 HTTP status.
SIGNAL_STALE a value that signals "stale=true" in the response
header to indicate the invalidity of the nonce and no need to ask
for authentication parameters and only a new nonce gets generated.
'MHD_YES' to generate a new nonce, 'MHD_NO' to ask for
authentication parameters.
Example: handling digest authentication requests and responses.
#define PAGE "<html><head><title>libmicrohttpd demo</title></head><body>Access granted</body></html>"
#define DENIED "<html><head><title>libmicrohttpd demo</title></head><body>Access denied</body></html>"
#define OPAQUE "11733b200778ce33060f31c9af70a870ba96ddd4"
static int
ahc_echo (void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data, size_t *upload_data_size, void **ptr)
{
struct MHD_Response *response;
char *username;
const char *password = "testpass";
const char *realm = "test@example.com";
int ret;
username = MHD_digest_auth_get_username(connection);
if (username == NULL)
{
response = MHD_create_response_from_buffer(strlen (DENIED),
DENIED,
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_auth_fail_response(connection, realm,
OPAQUE,
response,
MHD_NO);
MHD_destroy_response(response);
return ret;
}
ret = MHD_digest_auth_check(connection, realm,
username,
password,
300);
free(username);
if ( (ret == MHD_INVALID_NONCE) ||
(ret == MHD_NO) )
{
response = MHD_create_response_from_buffer(strlen (DENIED),
DENIED,
MHD_RESPMEM_PERSISTENT);
if (NULL == response)
return MHD_NO;
ret = MHD_queue_auth_fail_response(connection, realm,
OPAQUE,
response,
(ret == MHD_INVALID_NONCE) ? MHD_YES : MHD_NO);
MHD_destroy_response(response);
return ret;
}
response = MHD_create_response_from_buffer (strlen(PAGE), PAGE,
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return ret;
}
File: libmicrohttpd.info, Node: microhttpd-post, Next: microhttpd-info, Prev: microhttpd-dauth, Up: Top
11 Adding a 'POST' processor
****************************
* Menu:
* microhttpd-post api:: Programming interface for the
'POST' processor.
MHD provides the post processor API to make it easier for applications
to parse the data of a client's 'POST' request: the
'MHD_AccessHandlerCallback' will be invoked multiple times to process
data as it arrives; at each invocation a new chunk of data must be
processed. The arguments UPLOAD_DATA and UPLOAD_DATA_SIZE are used to
reference the chunk of data.
When 'MHD_AccessHandlerCallback' is invoked for a new connection: its
'*CON_CLS' argument is set to 'NULL'. When 'POST' data comes in the
upload buffer it is *mandatory* to use the CON_CLS to store a reference
to per-connection data. The fact that the pointer was initially 'NULL'
can be used to detect that this is a new request.
One method to detect that a new connection was established is to set
'*con_cls' to an unused integer:
int
access_handler (void *cls,
struct MHD_Connection * connection,
const char *url,
const char *method, const char *version,
const char *upload_data, size_t *upload_data_size,
void **con_cls)
{
static int old_connection_marker;
int new_connection = (NULL == *con_cls);
if (new_connection)
{
/* new connection with POST */
*con_cls = &old_connection_marker;
}
...
}
In contrast to the previous example, for 'POST' requests in particular,
it is more common to use the value of '*con_cls' to keep track of actual
state used during processing, such as the post processor (or a struct
containing a post processor):
int
access_handler (void *cls,
struct MHD_Connection * connection,
const char *url,
const char *method, const char *version,
const char *upload_data, size_t *upload_data_size,
void **con_cls)
{
struct MHD_PostProcessor * pp = *con_cls;
if (pp == NULL)
{
pp = MHD_create_post_processor(connection, ...);
*con_cls = pp;
return MHD_YES;
}
if (*upload_data_size)
{
MHD_post_process(pp, upload_data, *upload_data_size);
*upload_data_size = 0;
return MHD_YES;
}
else
{
MHD_destroy_post_processor(pp);
return MHD_queue_response(...);
}
}
Note that the callback from 'MHD_OPTION_NOTIFY_COMPLETED' should be
used to destroy the post processor. This cannot be done inside of the
access handler since the connection may not always terminate normally.
File: libmicrohttpd.info, Node: microhttpd-post api, Up: microhttpd-post
11.1 Programming interface for the 'POST' processor
===================================================
-- Function: struct MHD_PostProcessor * MHD_create_post_processor
(struct MHD_Connection *connection, size_t buffer_size,
MHD_PostDataIterator iterator, void *iterator_cls)
Create a PostProcessor. A PostProcessor can be used to
(incrementally) parse the data portion of a 'POST' request.
CONNECTION
the connection on which the 'POST' is happening (used to
determine the 'POST' format);
BUFFER_SIZE
maximum number of bytes to use for internal buffering (used
only for the parsing, specifically the parsing of the keys).
A tiny value (256-1024) should be sufficient; do *NOT* use a
value smaller than 256; for good performance, use 32k or 64k
(i.e. 65536).
ITERATOR
iterator to be called with the parsed data; must *NOT* be
'NULL';
ITERATOR_CLS
custom value to be used as first argument to ITERATOR.
Return 'NULL' on error (out of memory, unsupported encoding),
otherwise a PP handle.
-- Function: int MHD_post_process (struct MHD_PostProcessor *pp, const
char *post_data, size_t post_data_len)
Parse and process 'POST' data. Call this function when 'POST' data
is available (usually during an 'MHD_AccessHandlerCallback') with
the UPLOAD_DATA and UPLOAD_DATA_SIZE. Whenever possible, this will
then cause calls to the 'MHD_IncrementalKeyValueIterator'.
PP
the post processor;
POST_DATA
POST_DATA_LEN bytes of 'POST' data;
POST_DATA_LEN
length of POST_DATA.
Return 'MHD_YES' on success, 'MHD_NO' on error (out-of-memory,
iterator aborted, parse error).
-- Function: int MHD_destroy_post_processor (struct MHD_PostProcessor
*pp)
Release PostProcessor resources. After this function is being
called, the PostProcessor is guaranteed to no longer call its
iterator. There is no special call to the iterator to indicate the
end of the post processing stream. After destroying the
PostProcessor, the programmer should perform any necessary work to
complete the processing of the iterator.
Return 'MHD_YES' if processing completed nicely, 'MHD_NO' if there
were spurious characters or formatting problems with the post
request. It is common to ignore the return value of this function.
File: libmicrohttpd.info, Node: microhttpd-info, Next: microhttpd-util, Prev: microhttpd-post, Up: Top
12 Obtaining and modifying status information.
**********************************************
* Menu:
* microhttpd-info daemon:: State information about an MHD daemon
* microhttpd-info conn:: State information about a connection
* microhttpd-option conn:: Modify per-connection options
File: libmicrohttpd.info, Node: microhttpd-info daemon, Next: microhttpd-info conn, Up: microhttpd-info
12.1 Obtaining state information about an MHD daemon
====================================================
-- Function: const union MHD_DaemonInfo * MHD_get_daemon_info (struct
MHD_Daemon *daemon, enum MHD_DaemonInfoType infoType, ...)
Obtain information about the given daemon. This function is
currently not fully implemented.
DAEMON
the daemon about which information is desired;
INFOTYPE
type of information that is desired
...
additional arguments about the desired information (depending
on infoType)
Returns a union with the respective member (depending on infoType)
set to the desired information), or 'NULL' in case the desired
information is not available or applicable.
-- Enumeration: MHD_DaemonInfoType
Values of this enum are used to specify what information about a
daemon is desired.
'MHD_DAEMON_INFO_KEY_SIZE'
Request information about the key size for a particular cipher
algorithm. The cipher algorithm should be passed as an extra
argument (of type 'enum MHD_GNUTLS_CipherAlgorithm'). No
longer supported, using this value will cause
'MHD_get_daemon_info' to return NULL.
'MHD_DAEMON_INFO_MAC_KEY_SIZE'
Request information about the key size for a particular cipher
algorithm. The cipher algorithm should be passed as an extra
argument (of type 'enum MHD_GNUTLS_HashAlgorithm'). No longer
supported, using this value will cause 'MHD_get_daemon_info'
to return NULL.
'MHD_DAEMON_INFO_LISTEN_FD'
Request the file-descriptor number that MHD is using to listen
to the server socket. This can be useful if no port was
specified and a client needs to learn what port is actually
being used by MHD. No extra arguments should be passed.
'MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY'
Request the file-descriptor number that MHD is using for
epoll. If the build is not supporting epoll, NULL is
returned; if we are using a thread pool or this daemon was not
started with 'MHD_USE_EPOLL_LINUX_ONLY', (a pointer to) -1 is
returned. If we are using 'MHD_USE_SELECT_INTERNALLY' or are
in 'external' select mode, the internal epoll FD is returned.
This function must be used in external select mode with epoll
to obtain the FD to call epoll on. No extra arguments should
be passed.
'MHD_DAEMON_INFO_CURRENT_CONNECTIONS'
Request the number of current connections handled by the
daemon. No extra arguments should be passed and a pointer to
a 'union MHD_DaemonInfo' value is returned, with the
'num_connections' member of type 'unsigned int' set to the
number of active connections.
Note that in multi-threaded or internal-select mode, the real
number of current connections may already be different when
'MHD_get_daemon_info' returns. The number of current
connections can be used (even in multi-threaded and
internal-select mode) after 'MHD_quiesce_daemon' to detect
whether all connections have been handled.
File: libmicrohttpd.info, Node: microhttpd-info conn, Next: microhttpd-option conn, Prev: microhttpd-info daemon, Up: microhttpd-info
12.2 Obtaining state information about a connection
===================================================
-- Function: const union MHD_ConnectionInfo * MHD_get_connection_info
(struct MHD_Connection *daemon, enum MHD_ConnectionInfoType
infoType, ...)
Obtain information about the given connection.
CONNECTION
the connection about which information is desired;
INFOTYPE
type of information that is desired
...
additional arguments about the desired information (depending
on infoType)
Returns a union with the respective member (depending on infoType)
set to the desired information), or 'NULL' in case the desired
information is not available or applicable.
-- Enumeration: MHD_ConnectionInfoType
Values of this enum are used to specify what information about a
connection is desired.
'MHD_CONNECTION_INFO_CIPHER_ALGO'
What cipher algorithm is being used (HTTPS connections only).
Takes no extra arguments. 'NULL' is returned for non-HTTPS
connections.
'MHD_CONNECTION_INFO_PROTOCOL,'
Takes no extra arguments. Allows finding out the TLS/SSL
protocol used (HTTPS connections only). 'NULL' is returned
for non-HTTPS connections.
'MHD_CONNECTION_INFO_CLIENT_ADDRESS'
Returns information about the address of the client. Returns
essentially a 'struct sockaddr **' (since the API returns a
'union MHD_ConnectionInfo *' and that union contains a 'struct
sockaddr *').
'MHD_CONNECTION_INFO_GNUTLS_SESSION,'
Takes no extra arguments. Allows access to the underlying
GNUtls session, including access to the underlying GNUtls
client certificate (HTTPS connections only). Takes no extra
arguments. 'NULL' is returned for non-HTTPS connections.
'MHD_CONNECTION_INFO_GNUTLS_CLIENT_CERT,'
Dysfunctional (never implemented, deprecated). Use
MHD_CONNECTION_INFO_GNUTLS_SESSION to get the
'gnutls_session_t' and then call
'gnutls_certificate_get_peers()'.
'MHD_CONNECTION_INFO_DAEMON'
Returns information about 'struct MHD_Daemon' which manages
this connection.
'MHD_CONNECTION_INFO_CONNECTION_FD'
Returns the file descriptor (usually a TCP socket) associated
with this connection (in the "connect-fd" member of the
returned struct). Note that manipulating the descriptor
directly can have problematic consequences (as in, break
HTTP). Applications might use this access to manipulate TCP
options, for example to set the "TCP-NODELAY" option for
COMET-like applications. Note that MHD will set TCP-CORK
after sending the HTTP header and clear it after finishing the
footers automatically (if the platform supports it). As the
connection callbacks are invoked in between, those might be
used to set different values for TCP-CORK and TCP-NODELAY in
the meantime.
'MHD_CONNECTION_INFO_SOCKET_CONTEXT'
Returns the client-specific pointer to a 'void *' that was
(possibly) set during a 'MHD_NotifyConnectionCallback' when
the socket was first accepted. Note that this is NOT the same
as the 'con_cls' argument of the 'MHD_AccessHandlerCallback'.
The 'con_cls' is fresh for each HTTP request, while the
'socket_context' is fresh for each socket.
File: libmicrohttpd.info, Node: microhttpd-option conn, Prev: microhttpd-info conn, Up: microhttpd-info
12.3 Setting custom options for an individual connection
========================================================
-- Function: int MHD_set_connection_option (struct MHD_Connection
*daemon, enum MHD_CONNECTION_OPTION option, ...)
Set a custom option for the given connection.
CONNECTION
the connection for which an option should be set or modified;
OPTION
option to set
...
additional arguments for the option (depending on option)
Returns 'MHD_YES' on success, 'MHD_NO' for errors (i.e. option
argument invalid or option unknown).
-- Enumeration: MHD_CONNECTION_OPTION
Values of this enum are used to specify which option for a
connection should be changed.
'MHD_CONNECTION_OPTION_TIMEOUT'
Set a custom timeout for the given connection. Specified as
the number of seconds, given as an 'unsigned int'. Use zero
for no timeout.
File: libmicrohttpd.info, Node: microhttpd-util, Next: GNU-LGPL, Prev: microhttpd-info, Up: Top
13 Utility functions.
*********************
* Menu:
* microhttpd-util feature:: Test supported MHD features
* microhttpd-util unescape:: Unescape strings
File: libmicrohttpd.info, Node: microhttpd-util feature, Next: microhttpd-util unescape, Up: microhttpd-util
13.1 Testing for supported MHD features
=======================================
-- Enumeration: MHD_FEATURE
Values of this enum are used to specify what information about a
daemon is desired.
'MHD_FEATURE_MESSAGES'
Get whether messages are supported. If supported then in
debug mode messages can be printed to stderr or to external
logger.
'MHD_FEATURE_SSL'
Get whether HTTPS is supported. If supported then flag
MHD_USE_SSL and options MHD_OPTION_HTTPS_MEM_KEY,
MHD_OPTION_HTTPS_MEM_CERT, MHD_OPTION_HTTPS_MEM_TRUST,
MHD_OPTION_HTTPS_MEM_DHPARAMS, MHD_OPTION_HTTPS_CRED_TYPE,
MHD_OPTION_HTTPS_PRIORITIES can be used.
'MHD_FEATURE_HTTPS_CERT_CALLBACK'
Get whether option #MHD_OPTION_HTTPS_CERT_CALLBACK is
supported.
'MHD_FEATURE_IPv6'
Get whether IPv6 is supported. If supported then flag
MHD_USE_IPv6 can be used.
'MHD_FEATURE_IPv6_ONLY'
Get whether IPv6 without IPv4 is supported. If not supported
then IPv4 is always enabled in IPv6 sockets and flag
MHD_USE_DUAL_STACK if always used when MHD_USE_IPv6 is
specified.
'MHD_FEATURE_POLL'
Get whether 'poll()' is supported. If supported then flag
MHD_USE_POLL can be used.
'MHD_FEATURE_EPOLL'
Get whether 'epoll()' is supported. If supported then Flags
MHD_USE_EPOLL_LINUX_ONLY and
MHD_USE_EPOLL_INTERNALLY_LINUX_ONLY can be used.
'MHD_FEATURE_SHUTDOWN_LISTEN_SOCKET'
Get whether shutdown on listen socket to signal other threads
is supported. If not supported flag MHD_USE_PIPE_FOR_SHUTDOWN
is automatically forced.
'MHD_FEATURE_SOCKETPAIR'
Get whether a 'socketpair()' is used internally instead of a
'pipe()' to signal other threads.
'MHD_FEATURE_TCP_FASTOPEN'
Get whether TCP Fast Open is supported. If supported then
flag MHD_USE_TCP_FASTOPEN and option
MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE can be used.
'MHD_FEATURE_BASIC_AUTH'
Get whether HTTP Basic authorization is supported. If
supported then functions
'MHD_basic_auth_get_username_password()' and
'MHD_queue_basic_auth_fail_response()' can be used.
'MHD_FEATURE_DIGEST_AUTH'
Get whether HTTP Digest authorization is supported. If
supported then options MHD_OPTION_DIGEST_AUTH_RANDOM,
MHD_OPTION_NONCE_NC_SIZE and functions
'MHD_digest_auth_check()', can be used.
'MHD_FEATURE_POSTPROCESSOR'
Get whether postprocessor is supported. If supported then
functions 'MHD_create_post_processor()', 'MHD_post_process()',
'MHD_destroy_post_processor()' can be used.
-- Function: int MHD_is_feature_supported (enum MHD_FEATURE feature)
Get information about supported MHD features. Indicate that MHD
was compiled with or without support for particular feature. Some
features require additional support by the kernel. However, kernel
support is not checked by this function.
FEATURE
type of requested information
Returns 'MHD_YES' if the feature is supported, and 'MHD_NO' if not.
File: libmicrohttpd.info, Node: microhttpd-util unescape, Prev: microhttpd-util feature, Up: microhttpd-util
13.2 Unescape strings
=====================
-- Function: size_t MHD_http_unescape (char *val)
Process escape sequences ('%HH') Updates val in place; the result
should be UTF-8 encoded and cannot be larger than the input. The
result must also still be 0-terminated.
VAL
value to unescape (modified in the process), must be a
0-terminated UTF-8 string.
Returns length of the resulting val ('strlen(val)' may be shorter
afterwards due to elimination of escape sequences).
File: libmicrohttpd.info, Node: GNU-LGPL, Next: GNU GPL with eCos Extension, Prev: microhttpd-util, Up: Top
GNU-LGPL
********
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
[This is the first released version of the Lesser GPL. It also counts
as the successor of the GNU Library Public License, version 2, hence the
version number 2.1.]
Preamble
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How to Apply These Terms to Your New Libraries
----------------------------------------------
If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change. You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of
the ordinary General Public License).
To apply these terms, attach the following notices to the library.
It is safest to attach them to the start of each source file to most
effectively convey the exclusion of warranty; and each file should have
at least the "copyright" line and a pointer to where the full notice is
found.
ONE LINE TO GIVE THE LIBRARY'S NAME AND AN IDEA OF WHAT IT DOES.
Copyright (C) YEAR NAME OF AUTHOR
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at
your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
USA.
Also add information on how to contact you by electronic and paper
mail.
You should also get your employer (if you work as a programmer) or
your school, if any, to sign a "copyright disclaimer" for the library,
if necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the library
`Frob' (a library for tweaking knobs) written by James Random Hacker.
SIGNATURE OF TY COON, 1 April 1990
Ty Coon, President of Vice
That's all there is to it!
File: libmicrohttpd.info, Node: GNU GPL with eCos Extension, Next: GNU-FDL, Prev: GNU-LGPL, Up: Top
GNU GPL with eCos Extension
***************************
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
--------
The licenses for most software are designed to take away your freedom to
share and change it. By contrast, the GNU General Public License is
intended to guarantee your freedom to share and change free software--to
make sure the software is free for all its users. This General Public
License applies to most of the Free Software Foundation's software and
to any other program whose authors commit to using it. (Some other Free
Software Foundation software is covered by the GNU Library General
Public License instead.) You can apply it to your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it if
you want it, that you can change the software or use pieces of it in new
free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether
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you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
We protect your rights with two steps: (1) copyright the software,
and (2) offer you this license which gives you legal permission to copy,
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Also, for each author's protection and ours, we want to make certain
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Finally, any free program is threatened constantly by software
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The precise terms and conditions for copying, distribution and
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
1. This License applies to any program or other work which contains a
notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program",
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Activities other than copying, distribution and modification are
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of running the Program is not restricted, and the output from the
Program is covered only if its contents constitute a work based on
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Program). Whether that is true depends on what the Program does.
2. You may copy and distribute verbatim copies of the Program's source
code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any
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this License along with the Program.
You may charge a fee for the physical act of transferring a copy,
and you may at your option offer warranty protection in exchange
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in whole or in part contains or is derived from the Program or
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c. If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display
an announcement including an appropriate copyright notice and
a notice that there is no warranty (or else, saying that you
provide a warranty) and that users may redistribute the
program under these conditions, and telling the user how to
view a copy of this License. (Exception: if the Program
itself is interactive but does not normally print such an
announcement, your work based on the Program is not required
to print an announcement.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the
Program, and can be reasonably considered independent and separate
works in themselves, then this License, and its terms, do not apply
to those sections when you distribute them as separate works. But
when you distribute the same sections as part of a whole which is a
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Thus, it is not the intent of this section to claim rights or
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In addition, mere aggregation of another work not based on the
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of Sections 1 and 2 above provided that you also do one of the
following:
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licensee cannot impose that choice.
This section is intended to make thoroughly clear what is believed
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certain countries either by patents or by copyrighted interfaces,
the original copyright holder who places the Program under this
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10. The Free Software Foundation may publish revised and/or new
versions of the General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
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NO WARRANTY
12. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS
AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR
OR CORRECTION.
13. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU
OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY
OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
ECOS EXTENSION
14. As a special exception, if other files instantiate templates or
use macros or inline functions from this file, or you compile this
file and link it with other works to produce a work based on this
file, this file does not by itself cause the resulting work to be
covered by the GNU General Public License. However the source code
for this file must still be made available in accordance with
section (3) of the GNU General Public License v2.
This exception does not invalidate any other reasons why a work
based on this file might be covered by the GNU General Public
License.
END OF TERMS AND CONDITIONS
---------------------------
How to Apply These Terms to Your New Programs
=============================================
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
ONE LINE TO GIVE THE PROGRAM'S NAME AND AN IDEA OF WHAT IT DOES.
Copyright (C) 19YY NAME OF AUTHOR
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
Also add information on how to contact you by electronic and paper
mail.
If the program is interactive, make it output a short notice like
this when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) 19YY NAME OF AUTHOR
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w'. This is free software, and you are welcome
to redistribute it under certain conditions; type `show c'
for details.
The hypothetical commands 'show w' and 'show c' should show the
appropriate parts of the General Public License. Of course, the
commands you use may be called something other than 'show w' and 'show
c'; they could even be mouse-clicks or menu items--whatever suits your
program.
You should also get your employer (if you work as a programmer) or
your school, if any, to sign a "copyright disclaimer" for the program,
if necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright
interest in the program `Gnomovision'
(which makes passes at compilers) written
by James Hacker.
SIGNATURE OF TY COON, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your
program into proprietary programs. If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the
GNU Library General Public License instead of this License.
File: libmicrohttpd.info, Node: GNU-FDL, Next: Concept Index, Prev: GNU GPL with eCos Extension, Up: Top
GNU-FDL
*******
Version 1.3, 3 November 2008
Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
<http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
0. PREAMBLE
The purpose of this License is to make a manual, textbook, or other
functional and useful document "free" in the sense of freedom: to
assure everyone the effective freedom to copy and redistribute it,
with or without modifying it, either commercially or
noncommercially. Secondarily, this License preserves for the
author and publisher a way to get credit for their work, while not
being considered responsible for modifications made by others.
This License is a kind of "copyleft", which means that derivative
works of the document must themselves be free in the same sense.
It complements the GNU General Public License, which is a copyleft
license designed for free software.
We have designed this License in order to use it for manuals for
free software, because free software needs free documentation: a
free program should come with manuals providing the same freedoms
that the software does. But this License is not limited to
software manuals; it can be used for any textual work, regardless
of subject matter or whether it is published as a printed book. We
recommend this License principally for works whose purpose is
instruction or reference.
1. APPLICABILITY AND DEFINITIONS
This License applies to any manual or other work, in any medium,
that contains a notice placed by the copyright holder saying it can
be distributed under the terms of this License. Such a notice
grants a world-wide, royalty-free license, unlimited in duration,
to use that work under the conditions stated herein. The
"Document", below, refers to any such manual or work. Any member
of the public is a licensee, and is addressed as "you". You accept
the license if you copy, modify or distribute the work in a way
requiring permission under copyright law.
A "Modified Version" of the Document means any work containing the
Document or a portion of it, either copied verbatim, or with
modifications and/or translated into another language.
A "Secondary Section" is a named appendix or a front-matter section
of the Document that deals exclusively with the relationship of the
publishers or authors of the Document to the Document's overall
subject (or to related matters) and contains nothing that could
fall directly within that overall subject. (Thus, if the Document
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explain any mathematics.) The relationship could be a matter of
historical connection with the subject or with related matters, or
of legal, commercial, philosophical, ethical or political position
regarding them.
The "Invariant Sections" are certain Secondary Sections whose
titles are designated, as being those of Invariant Sections, in the
notice that says that the Document is released under this License.
If a section does not fit the above definition of Secondary then it
is not allowed to be designated as Invariant. The Document may
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any Invariant Sections then there are none.
The "Cover Texts" are certain short passages of text that are
listed, as Front-Cover Texts or Back-Cover Texts, in the notice
that says that the Document is released under this License. A
Front-Cover Text may be at most 5 words, and a Back-Cover Text may
be at most 25 words.
A "Transparent" copy of the Document means a machine-readable copy,
represented in a format whose specification is available to the
general public, that is suitable for revising the document
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formatters or for automatic translation to a variety of formats
suitable for input to text formatters. A copy made in an otherwise
Transparent file format whose markup, or absence of markup, has
been arranged to thwart or discourage subsequent modification by
readers is not Transparent. An image format is not Transparent if
used for any substantial amount of text. A copy that is not
"Transparent" is called "Opaque".
Examples of suitable formats for Transparent copies include plain
ASCII without markup, Texinfo input format, LaTeX input format,
SGML or XML using a publicly available DTD, and standard-conforming
simple HTML, PostScript or PDF designed for human modification.
Examples of transparent image formats include PNG, XCF and JPG.
Opaque formats include proprietary formats that can be read and
edited only by proprietary word processors, SGML or XML for which
the DTD and/or processing tools are not generally available, and
the machine-generated HTML, PostScript or PDF produced by some word
processors for output purposes only.
The "Title Page" means, for a printed book, the title page itself,
plus such following pages as are needed to hold, legibly, the
material this License requires to appear in the title page. For
works in formats which do not have any title page as such, "Title
Page" means the text near the most prominent appearance of the
work's title, preceding the beginning of the body of the text.
The "publisher" means any person or entity that distributes copies
of the Document to the public.
A section "Entitled XYZ" means a named subunit of the Document
whose title either is precisely XYZ or contains XYZ in parentheses
following text that translates XYZ in another language. (Here XYZ
stands for a specific section name mentioned below, such as
"Acknowledgements", "Dedications", "Endorsements", or "History".)
To "Preserve the Title" of such a section when you modify the
Document means that it remains a section "Entitled XYZ" according
to this definition.
The Document may include Warranty Disclaimers next to the notice
which states that this License applies to the Document. These
Warranty Disclaimers are considered to be included by reference in
this License, but only as regards disclaiming warranties: any other
implication that these Warranty Disclaimers may have is void and
has no effect on the meaning of this License.
2. VERBATIM COPYING
You may copy and distribute the Document in any medium, either
commercially or noncommercially, provided that this License, the
copyright notices, and the license notice saying this License
applies to the Document are reproduced in all copies, and that you
add no other conditions whatsoever to those of this License. You
may not use technical measures to obstruct or control the reading
or further copying of the copies you make or distribute. However,
you may accept compensation in exchange for copies. If you
distribute a large enough number of copies you must also follow the
conditions in section 3.
You may also lend copies, under the same conditions stated above,
and you may publicly display copies.
3. COPYING IN QUANTITY
If you publish printed copies (or copies in media that commonly
have printed covers) of the Document, numbering more than 100, and
the Document's license notice requires Cover Texts, you must
enclose the copies in covers that carry, clearly and legibly, all
these Cover Texts: Front-Cover Texts on the front cover, and
Back-Cover Texts on the back cover. Both covers must also clearly
and legibly identify you as the publisher of these copies. The
front cover must present the full title with all words of the title
equally prominent and visible. You may add other material on the
covers in addition. Copying with changes limited to the covers, as
long as they preserve the title of the Document and satisfy these
conditions, can be treated as verbatim copying in other respects.
If the required texts for either cover are too voluminous to fit
legibly, you should put the first ones listed (as many as fit
reasonably) on the actual cover, and continue the rest onto
adjacent pages.
If you publish or distribute Opaque copies of the Document
numbering more than 100, you must either include a machine-readable
Transparent copy along with each Opaque copy, or state in or with
each Opaque copy a computer-network location from which the general
network-using public has access to download using public-standard
network protocols a complete Transparent copy of the Document, free
of added material. If you use the latter option, you must take
reasonably prudent steps, when you begin distribution of Opaque
copies in quantity, to ensure that this Transparent copy will
remain thus accessible at the stated location until at least one
year after the last time you distribute an Opaque copy (directly or
through your agents or retailers) of that edition to the public.
It is requested, but not required, that you contact the authors of
the Document well before redistributing any large number of copies,
to give them a chance to provide you with an updated version of the
Document.
4. MODIFICATIONS
You may copy and distribute a Modified Version of the Document
under the conditions of sections 2 and 3 above, provided that you
release the Modified Version under precisely this License, with the
Modified Version filling the role of the Document, thus licensing
distribution and modification of the Modified Version to whoever
possesses a copy of it. In addition, you must do these things in
the Modified Version:
A. Use in the Title Page (and on the covers, if any) a title
distinct from that of the Document, and from those of previous
versions (which should, if there were any, be listed in the
History section of the Document). You may use the same title
as a previous version if the original publisher of that
version gives permission.
B. List on the Title Page, as authors, one or more persons or
entities responsible for authorship of the modifications in
the Modified Version, together with at least five of the
principal authors of the Document (all of its principal
authors, if it has fewer than five), unless they release you
from this requirement.
C. State on the Title page the name of the publisher of the
Modified Version, as the publisher.
D. Preserve all the copyright notices of the Document.
E. Add an appropriate copyright notice for your modifications
adjacent to the other copyright notices.
F. Include, immediately after the copyright notices, a license
notice giving the public permission to use the Modified
Version under the terms of this License, in the form shown in
the Addendum below.
G. Preserve in that license notice the full lists of Invariant
Sections and required Cover Texts given in the Document's
license notice.
H. Include an unaltered copy of this License.
I. Preserve the section Entitled "History", Preserve its Title,
and add to it an item stating at least the title, year, new
authors, and publisher of the Modified Version as given on the
Title Page. If there is no section Entitled "History" in the
Document, create one stating the title, year, authors, and
publisher of the Document as given on its Title Page, then add
an item describing the Modified Version as stated in the
previous sentence.
J. Preserve the network location, if any, given in the Document
for public access to a Transparent copy of the Document, and
likewise the network locations given in the Document for
previous versions it was based on. These may be placed in the
"History" section. You may omit a network location for a work
that was published at least four years before the Document
itself, or if the original publisher of the version it refers
to gives permission.
K. For any section Entitled "Acknowledgements" or "Dedications",
Preserve the Title of the section, and preserve in the section
all the substance and tone of each of the contributor
acknowledgements and/or dedications given therein.
L. Preserve all the Invariant Sections of the Document, unaltered
in their text and in their titles. Section numbers or the
equivalent are not considered part of the section titles.
M. Delete any section Entitled "Endorsements". Such a section
may not be included in the Modified Version.
N. Do not retitle any existing section to be Entitled
"Endorsements" or to conflict in title with any Invariant
Section.
O. Preserve any Warranty Disclaimers.
If the Modified Version includes new front-matter sections or
appendices that qualify as Secondary Sections and contain no
material copied from the Document, you may at your option designate
some or all of these sections as invariant. To do this, add their
titles to the list of Invariant Sections in the Modified Version's
license notice. These titles must be distinct from any other
section titles.
You may add a section Entitled "Endorsements", provided it contains
nothing but endorsements of your Modified Version by various
parties--for example, statements of peer review or that the text
has been approved by an organization as the authoritative
definition of a standard.
You may add a passage of up to five words as a Front-Cover Text,
and a passage of up to 25 words as a Back-Cover Text, to the end of
the list of Cover Texts in the Modified Version. Only one passage
of Front-Cover Text and one of Back-Cover Text may be added by (or
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File: libmicrohttpd.info, Node: Concept Index, Next: Function and Data Index, Prev: GNU-FDL, Up: Top
Concept Index
*************
[index ]
* Menu:
* ARM: microhttpd-intro. (line 249)
* bind, restricting bind: microhttpd-const. (line 226)
* bind, restricting bind <1>: microhttpd-const. (line 445)
* cipher: microhttpd-const. (line 299)
* clock: microhttpd-const. (line 88)
* compilation: microhttpd-intro. (line 107)
* connection, limiting number of connections: microhttpd-const.
(line 150)
* connection, limiting number of connections <1>: microhttpd-info daemon.
(line 60)
* cookie: microhttpd-const. (line 481)
* cortex m3: microhttpd-intro. (line 249)
* date: microhttpd-const. (line 88)
* debugging: microhttpd-const. (line 24)
* debugging <1>: microhttpd-const. (line 237)
* DH: microhttpd-const. (line 437)
* digest auth: microhttpd-const. (line 322)
* digest auth <1>: microhttpd-const. (line 333)
* eCos, GNU General Public License with eCos Extension: GNU GPL with eCos Extension.
(line 6)
* embedded systems: microhttpd-intro. (line 107)
* embedded systems <1>: microhttpd-intro. (line 249)
* embedded systems <2>: microhttpd-const. (line 88)
* embedded systems <3>: microhttpd-const. (line 95)
* embedded systems <4>: microhttpd-const. (line 421)
* epoll: microhttpd-intro. (line 55)
* epoll <1>: microhttpd-const. (line 76)
* epoll <2>: microhttpd-info daemon.
(line 49)
* escaping: microhttpd-const. (line 404)
* FD_SETSIZE: microhttpd-const. (line 68)
* FD_SETSIZE <1>: microhttpd-const. (line 76)
* foreign-function interface: microhttpd-const. (line 382)
* GPL, GNU General Public License: GNU GPL with eCos Extension.
(line 6)
* IAR: microhttpd-intro. (line 249)
* internationalization: microhttpd-const. (line 404)
* IPv6: microhttpd-const. (line 43)
* IPv6 <1>: microhttpd-const. (line 53)
* license: GNU-LGPL. (line 6)
* license <1>: GNU GPL with eCos Extension.
(line 6)
* license <2>: GNU-FDL. (line 6)
* listen: microhttpd-const. (line 95)
* listen <1>: microhttpd-const. (line 121)
* listen <2>: microhttpd-const. (line 427)
* listen <3>: microhttpd-info daemon.
(line 43)
* logging: microhttpd-const. (line 237)
* logging <1>: microhttpd-const. (line 363)
* long long: microhttpd-intro. (line 249)
* memory: microhttpd-const. (line 142)
* memory, limiting memory utilization: microhttpd-const. (line 134)
* MHD_LONG_LONG: microhttpd-intro. (line 249)
* microhttpd.h: microhttpd-intro. (line 189)
* options: microhttpd-const. (line 382)
* performance: microhttpd-intro. (line 77)
* performance <1>: microhttpd-const. (line 374)
* poll: microhttpd-intro. (line 55)
* poll <1>: microhttpd-const. (line 68)
* poll <2>: microhttpd-init. (line 74)
* portability: microhttpd-intro. (line 107)
* portability <1>: microhttpd-intro. (line 189)
* POST method: microhttpd-const. (line 485)
* POST method <1>: microhttpd-struct. (line 19)
* POST method <2>: microhttpd-cb. (line 48)
* POST method <3>: microhttpd-post. (line 6)
* POST method <4>: microhttpd-post api. (line 6)
* proxy: microhttpd-const. (line 95)
* pthread: microhttpd-const. (line 421)
* PUT method: microhttpd-cb. (line 48)
* query string: microhttpd-const. (line 237)
* quiesce: microhttpd-const. (line 102)
* quiesce <1>: microhttpd-init. (line 51)
* random: microhttpd-const. (line 322)
* replay attack: microhttpd-const. (line 333)
* reusing listening address: microhttpd-const. (line 445)
* select: microhttpd-intro. (line 55)
* select <1>: microhttpd-const. (line 68)
* select <2>: microhttpd-const. (line 76)
* select <3>: microhttpd-init. (line 74)
* select <4>: microhttpd-init. (line 89)
* signals: microhttpd-intro. (line 210)
* SNI: microhttpd-const. (line 307)
* SSL: microhttpd-const. (line 32)
* SSL <1>: microhttpd-const. (line 260)
* SSL <2>: microhttpd-const. (line 266)
* SSL <3>: microhttpd-const. (line 276)
* SSL <4>: microhttpd-const. (line 282)
* SSL <5>: microhttpd-const. (line 294)
* SSL <6>: microhttpd-const. (line 299)
* SSL <7>: microhttpd-const. (line 307)
* SSL <8>: microhttpd-const. (line 437)
* stack: microhttpd-const. (line 421)
* systemd: microhttpd-const. (line 356)
* thread: microhttpd-const. (line 421)
* timeout: microhttpd-const. (line 178)
* timeout <1>: microhttpd-inspect. (line 24)
* timeout <2>: microhttpd-option conn.
(line 6)
* TLS: microhttpd-const. (line 32)
* TLS <1>: microhttpd-const. (line 260)
* TLS <2>: microhttpd-const. (line 266)
* TLS <3>: microhttpd-const. (line 276)
* TLS <4>: microhttpd-const. (line 282)
* TLS <5>: microhttpd-const. (line 294)
* TLS <6>: microhttpd-const. (line 299)
* TLS <7>: microhttpd-const. (line 307)
* TLS <8>: microhttpd-const. (line 437)
File: libmicrohttpd.info, Node: Function and Data Index, Next: Type Index, Prev: Concept Index, Up: Top
Function and Data Index
***********************
[index ]
* Menu:
* *MHD_AcceptPolicyCallback: microhttpd-cb. (line 6)
* *MHD_AccessHandlerCallback: microhttpd-cb. (line 19)
* *MHD_ContentReaderCallback: microhttpd-cb. (line 138)
* *MHD_ContentReaderFreeCallback: microhttpd-cb. (line 185)
* *MHD_KeyValueIterator: microhttpd-cb. (line 116)
* *MHD_PostDataIterator: microhttpd-cb. (line 190)
* *MHD_RequestCompletedCallback: microhttpd-cb. (line 96)
* MHD_add_connection: microhttpd-init. (line 115)
* MHD_add_response_footer: microhttpd-response headers.
(line 18)
* MHD_add_response_header: microhttpd-response headers.
(line 6)
* MHD_basic_auth_get_username_password: microhttpd-dauth basic.
(line 6)
* MHD_create_post_processor: microhttpd-post api. (line 6)
* MHD_create_response_from_buffer: microhttpd-response create.
(line 92)
* MHD_create_response_from_callback: microhttpd-response create.
(line 6)
* MHD_create_response_from_data: microhttpd-response create.
(line 113)
* MHD_create_response_from_fd: microhttpd-response create.
(line 32)
* MHD_create_response_from_fd_at_offset: microhttpd-response create.
(line 50)
* MHD_del_response_header: microhttpd-response headers.
(line 34)
* MHD_destroy_post_processor: microhttpd-post api. (line 52)
* MHD_destroy_response: microhttpd-response enqueue.
(line 28)
* MHD_digest_auth_check: microhttpd-dauth digest.
(line 13)
* MHD_digest_auth_get_username: microhttpd-dauth digest.
(line 6)
* MHD_get_connection_info: microhttpd-info conn.
(line 6)
* MHD_get_connection_values: microhttpd-requests. (line 6)
* MHD_get_daemon_info: microhttpd-info daemon.
(line 6)
* MHD_get_fdset: microhttpd-inspect. (line 6)
* MHD_get_response_header: microhttpd-response inspect.
(line 18)
* MHD_get_response_headers: microhttpd-response inspect.
(line 6)
* MHD_get_timeout: microhttpd-inspect. (line 22)
* MHD_http_unescape: microhttpd-util unescape.
(line 6)
* MHD_is_feature_supported: microhttpd-util feature.
(line 75)
* MHD_lookup_connection_value: microhttpd-requests. (line 56)
* MHD_post_process: microhttpd-post api. (line 33)
* MHD_queue_auth_fail_response: microhttpd-dauth digest.
(line 35)
* MHD_queue_basic_auth_fail_response: microhttpd-dauth basic.
(line 17)
* MHD_queue_response: microhttpd-response enqueue.
(line 6)
* MHD_quiesce_daemon: microhttpd-init. (line 50)
* MHD_resume_connection: microhttpd-flow. (line 49)
* MHD_run: microhttpd-init. (line 70)
* MHD_run_from_select: microhttpd-init. (line 86)
* MHD_set_connection_option: microhttpd-option conn.
(line 6)
* MHD_set_connection_value: microhttpd-requests. (line 33)
* MHD_set_panic_func: microhttpd-init. (line 6)
* MHD_set_response_options: microhttpd-response options.
(line 6)
* MHD_start_daemon: microhttpd-init. (line 18)
* MHD_stop_daemon: microhttpd-init. (line 67)
* MHD_suspend_connection: microhttpd-flow. (line 20)
File: libmicrohttpd.info, Node: Type Index, Prev: Function and Data Index, Up: Top
Type Index
**********
[index ]
* Menu:
* MHD_Connection: microhttpd-struct. (line 9)
* MHD_ConnectionInfo: microhttpd-struct. (line 21)
* MHD_ConnectionInfoType: microhttpd-info conn.
(line 25)
* MHD_CONNECTION_OPTION: microhttpd-option conn.
(line 22)
* MHD_Daemon: microhttpd-struct. (line 6)
* MHD_DaemonInfo: microhttpd-struct. (line 24)
* MHD_DaemonInfoType: microhttpd-info daemon.
(line 25)
* MHD_FEATURE: microhttpd-util feature.
(line 6)
* MHD_FLAG: microhttpd-const. (line 6)
* MHD_OPTION: microhttpd-const. (line 125)
* MHD_OptionItem: microhttpd-const. (line 457)
* MHD_PostProcessor: microhttpd-struct. (line 18)
* MHD_RequestTerminationCode: microhttpd-const. (line 498)
* MHD_Response: microhttpd-struct. (line 15)
* MHD_ResponseFlags: microhttpd-const. (line 538)
* MHD_ResponseMemoryMode: microhttpd-const. (line 516)
* MHD_ResponseOptions: microhttpd-const. (line 550)
* MHD_ValueKind: microhttpd-const. (line 470)
Tag Table:
Node: Top813
Node: microhttpd-intro3014
Ref: fig:performance7063
Ref: tbl:supported8008
Node: microhttpd-const15281
Node: microhttpd-struct42798
Node: microhttpd-cb43578
Node: microhttpd-init52920
Node: microhttpd-inspect58674
Node: microhttpd-requests60611
Node: microhttpd-responses64095
Node: microhttpd-response enqueue65207
Ref: microhttpd-response enqueue-Footnote-167474
Node: microhttpd-response create67693
Node: microhttpd-response headers73726
Node: microhttpd-response options75553
Node: microhttpd-response inspect76408
Node: microhttpd-flow77581
Node: microhttpd-dauth80172
Node: microhttpd-dauth basic81723
Node: microhttpd-dauth digest82915
Node: microhttpd-post87563
Node: microhttpd-post api90508
Node: microhttpd-info93092
Node: microhttpd-info daemon93514
Node: microhttpd-info conn96919
Node: microhttpd-option conn100636
Node: microhttpd-util101700
Node: microhttpd-util feature101971
Node: microhttpd-util unescape105412
Node: GNU-LGPL106052
Node: GNU GPL with eCos Extension134156
Node: GNU-FDL154024
Node: Concept Index179110
Node: Function and Data Index187200
Node: Type Index192372
End Tag Table