/*
This file is part of libmicrohttpd
Copyright (C) 2006-2015 Christian Grothoff (and other contributing authors)
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
*/
/**
* @file microhttpd.h
* @brief public interface to libmicrohttpd
* @author Christian Grothoff
* @author Chris GauthierDickey
*
* All symbols defined in this header 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
* "mulitpart/formdata"). Unsupported encodings and large POST
* submissions may require the application to manually process
* the stream, which is provided to the main application (and thus can 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 (with the exception of #MHD_set_connection_value,
* which must only be used in a particular context).
*
* NEW: 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 headers are needed may
* depend on your platform; for possible suggestions consult
* "platform.h" in the MHD distribution). If you have done so, you
* should also have a line with "#define MHD_PLATFORM_H" which will
* prevent this header from trying (and, depending on your platform,
* failing) to include the right headers.
*
* @defgroup event event-loop control
* MHD API to start and stop the HTTP server and manage the event loop.
* @defgroup response generation of responses
* MHD API used to generate responses.
* @defgroup request handling of requests
* MHD API used to access information about requests.
* @defgroup authentication HTTP authentication
* MHD API related to basic and digest HTTP authentication.
* @defgroup logging logging
* MHD API to mange logging and error handling
* @defgroup specialized misc. specialized functions
* This group includes functions that do not fit into any particular
* category and that are rarely used.
*/
#ifndef MHD_MICROHTTPD_H
#define MHD_MICROHTTPD_H
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/* While we generally would like users to use a configure-driven
build process which detects which headers are present and
hence works on any platform, we use "standard" includes here
to build out-of-the-box for beginning users on common systems.
Once you have a proper build system and go for more exotic
platforms, you should define MHD_PLATFORM_H in some header that
you always include *before* "microhttpd.h". Then the following
"standard" includes won't be used (which might be a good
idea, especially on platforms where they do not exist). */
#ifndef MHD_PLATFORM_H
#include <stdarg.h>
#include <stdint.h>
#include <sys/types.h>
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <ws2tcpip.h>
#if defined(_MSC_FULL_VER) && !defined (_SSIZE_T_DEFINED)
#define _SSIZE_T_DEFINED
typedef intptr_t ssize_t;
#endif // !_SSIZE_T_DEFINED */
#else
#include <unistd.h>
#include <sys/time.h>
#include <sys/socket.h>
#endif
#endif
#if defined(__CYGWIN__) && !defined(_SYS_TYPES_FD_SET)
/* Do not define __USE_W32_SOCKETS under Cygwin! */
#error Cygwin with winsock fd_set is not supported
#endif
/**
* Current version of the library.
* 0x01093001 = 1.9.30-1.
*/
#define MHD_VERSION 0x00094200
/**
* MHD-internal return code for "YES".
*/
#define MHD_YES 1
/**
* MHD-internal return code for "NO".
*/
#define MHD_NO 0
/**
* MHD digest auth internal code for an invalid nonce.
*/
#define MHD_INVALID_NONCE -1
/**
* Constant used to indicate unknown size (use when
* creating a response).
*/
#ifdef UINT64_MAX
#define MHD_SIZE_UNKNOWN UINT64_MAX
#else
#define MHD_SIZE_UNKNOWN ((uint64_t) -1LL)
#endif
#ifdef SIZE_MAX
#define MHD_CONTENT_READER_END_OF_STREAM SIZE_MAX
#define MHD_CONTENT_READER_END_WITH_ERROR (SIZE_MAX - 1)
#else
#define MHD_CONTENT_READER_END_OF_STREAM ((size_t) -1LL)
#define MHD_CONTENT_READER_END_WITH_ERROR (((size_t) -1LL) - 1)
#endif
#ifndef _MHD_EXTERN
#if defined(_WIN32) && defined(MHD_W32LIB)
#define _MHD_EXTERN extern
#elif defined (_WIN32) && defined(MHD_W32DLL)
/* Define MHD_W32DLL when using MHD as W32 .DLL to speed up linker a little */
#define _MHD_EXTERN __declspec(dllimport)
#else
#define _MHD_EXTERN extern
#endif
#endif
#ifndef MHD_SOCKET_DEFINED
/**
* MHD_socket is type for socket FDs
*/
#if !defined(_WIN32) || defined(_SYS_TYPES_FD_SET)
#define MHD_POSIX_SOCKETS 1
typedef int MHD_socket;
#define MHD_INVALID_SOCKET (-1)
#else /* !defined(_WIN32) || defined(_SYS_TYPES_FD_SET) */
#define MHD_WINSOCK_SOCKETS 1
#include <winsock2.h>
typedef SOCKET MHD_socket;
#define MHD_INVALID_SOCKET (INVALID_SOCKET)
#endif /* !defined(_WIN32) || defined(_SYS_TYPES_FD_SET) */
#define MHD_SOCKET_DEFINED 1
#endif /* MHD_SOCKET_DEFINED */
/**
* Not all architectures and `printf()`'s support the `long long` type.
* This gives the ability to replace `long long` with just a `long`,
* standard `int` or a `short`.
*/
#ifndef MHD_LONG_LONG
/**
* @deprecated use #MHD_UNSIGNED_LONG_LONG instead!
*/
#define MHD_LONG_LONG long long
#define MHD_UNSIGNED_LONG_LONG unsigned long long
#endif
/**
* Format string for printing a variable of type #MHD_LONG_LONG.
* You should only redefine this if you also define #MHD_LONG_LONG.
*/
#ifndef MHD_LONG_LONG_PRINTF
/**
* @deprecated use #MHD_UNSIGNED_LONG_LONG_PRINTF instead!
*/
#define MHD_LONG_LONG_PRINTF "ll"
#define MHD_UNSIGNED_LONG_LONG_PRINTF "%llu"
#endif
/**
* @defgroup httpcode HTTP response codes.
* These are the status codes defined for HTTP responses.
* @{
*/
#define MHD_HTTP_CONTINUE 100
#define MHD_HTTP_SWITCHING_PROTOCOLS 101
#define MHD_HTTP_PROCESSING 102
#define MHD_HTTP_OK 200
#define MHD_HTTP_CREATED 201
#define MHD_HTTP_ACCEPTED 202
#define MHD_HTTP_NON_AUTHORITATIVE_INFORMATION 203
#define MHD_HTTP_NO_CONTENT 204
#define MHD_HTTP_RESET_CONTENT 205
#define MHD_HTTP_PARTIAL_CONTENT 206
#define MHD_HTTP_MULTI_STATUS 207
#define MHD_HTTP_MULTIPLE_CHOICES 300
#define MHD_HTTP_MOVED_PERMANENTLY 301
#define MHD_HTTP_FOUND 302
#define MHD_HTTP_SEE_OTHER 303
#define MHD_HTTP_NOT_MODIFIED 304
#define MHD_HTTP_USE_PROXY 305
#define MHD_HTTP_SWITCH_PROXY 306
#define MHD_HTTP_TEMPORARY_REDIRECT 307
#define MHD_HTTP_BAD_REQUEST 400
#define MHD_HTTP_UNAUTHORIZED 401
#define MHD_HTTP_PAYMENT_REQUIRED 402
#define MHD_HTTP_FORBIDDEN 403
#define MHD_HTTP_NOT_FOUND 404
#define MHD_HTTP_METHOD_NOT_ALLOWED 405
#define MHD_HTTP_NOT_ACCEPTABLE 406
/** @deprecated */
#define MHD_HTTP_METHOD_NOT_ACCEPTABLE 406
#define MHD_HTTP_PROXY_AUTHENTICATION_REQUIRED 407
#define MHD_HTTP_REQUEST_TIMEOUT 408
#define MHD_HTTP_CONFLICT 409
#define MHD_HTTP_GONE 410
#define MHD_HTTP_LENGTH_REQUIRED 411
#define MHD_HTTP_PRECONDITION_FAILED 412
#define MHD_HTTP_REQUEST_ENTITY_TOO_LARGE 413
#define MHD_HTTP_REQUEST_URI_TOO_LONG 414
#define MHD_HTTP_UNSUPPORTED_MEDIA_TYPE 415
#define MHD_HTTP_REQUESTED_RANGE_NOT_SATISFIABLE 416
#define MHD_HTTP_EXPECTATION_FAILED 417
#define MHD_HTTP_UNPROCESSABLE_ENTITY 422
#define MHD_HTTP_LOCKED 423
#define MHD_HTTP_FAILED_DEPENDENCY 424
#define MHD_HTTP_UNORDERED_COLLECTION 425
#define MHD_HTTP_UPGRADE_REQUIRED 426
#define MHD_HTTP_NO_RESPONSE 444
#define MHD_HTTP_RETRY_WITH 449
#define MHD_HTTP_BLOCKED_BY_WINDOWS_PARENTAL_CONTROLS 450
#define MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS 451
#define MHD_HTTP_INTERNAL_SERVER_ERROR 500
#define MHD_HTTP_NOT_IMPLEMENTED 501
#define MHD_HTTP_BAD_GATEWAY 502
#define MHD_HTTP_SERVICE_UNAVAILABLE 503
#define MHD_HTTP_GATEWAY_TIMEOUT 504
#define MHD_HTTP_HTTP_VERSION_NOT_SUPPORTED 505
#define MHD_HTTP_VARIANT_ALSO_NEGOTIATES 506
#define MHD_HTTP_INSUFFICIENT_STORAGE 507
#define MHD_HTTP_BANDWIDTH_LIMIT_EXCEEDED 509
#define MHD_HTTP_NOT_EXTENDED 510
/** @} */ /* end of group httpcode */
/**
* Flag to be or-ed with MHD_HTTP status code for
* SHOUTcast. This will cause the response to begin
* with the SHOUTcast "ICY" line instad of "HTTP".
* @ingroup specialized
*/
#define MHD_ICY_FLAG ((uint32_t)(((uint32_t)1) << 31))
/**
* @defgroup headers HTTP headers
* These are the standard headers found in HTTP requests and responses.
* @{
*/
/* See also: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html */
#define MHD_HTTP_HEADER_ACCEPT "Accept"
#define MHD_HTTP_HEADER_ACCEPT_CHARSET "Accept-Charset"
#define MHD_HTTP_HEADER_ACCEPT_ENCODING "Accept-Encoding"
#define MHD_HTTP_HEADER_ACCEPT_LANGUAGE "Accept-Language"
#define MHD_HTTP_HEADER_ACCEPT_RANGES "Accept-Ranges"
#define MHD_HTTP_HEADER_AGE "Age"
#define MHD_HTTP_HEADER_ALLOW "Allow"
#define MHD_HTTP_HEADER_AUTHORIZATION "Authorization"
#define MHD_HTTP_HEADER_CACHE_CONTROL "Cache-Control"
#define MHD_HTTP_HEADER_CONNECTION "Connection"
#define MHD_HTTP_HEADER_CONTENT_ENCODING "Content-Encoding"
#define MHD_HTTP_HEADER_CONTENT_LANGUAGE "Content-Language"
#define MHD_HTTP_HEADER_CONTENT_LENGTH "Content-Length"
#define MHD_HTTP_HEADER_CONTENT_LOCATION "Content-Location"
#define MHD_HTTP_HEADER_CONTENT_MD5 "Content-MD5"
#define MHD_HTTP_HEADER_CONTENT_RANGE "Content-Range"
#define MHD_HTTP_HEADER_CONTENT_TYPE "Content-Type"
#define MHD_HTTP_HEADER_COOKIE "Cookie"
#define MHD_HTTP_HEADER_DATE "Date"
#define MHD_HTTP_HEADER_ETAG "ETag"
#define MHD_HTTP_HEADER_EXPECT "Expect"
#define MHD_HTTP_HEADER_EXPIRES "Expires"
#define MHD_HTTP_HEADER_FROM "From"
#define MHD_HTTP_HEADER_HOST "Host"
#define MHD_HTTP_HEADER_IF_MATCH "If-Match"
#define MHD_HTTP_HEADER_IF_MODIFIED_SINCE "If-Modified-Since"
#define MHD_HTTP_HEADER_IF_NONE_MATCH "If-None-Match"
#define MHD_HTTP_HEADER_IF_RANGE "If-Range"
#define MHD_HTTP_HEADER_IF_UNMODIFIED_SINCE "If-Unmodified-Since"
#define MHD_HTTP_HEADER_LAST_MODIFIED "Last-Modified"
#define MHD_HTTP_HEADER_LOCATION "Location"
#define MHD_HTTP_HEADER_MAX_FORWARDS "Max-Forwards"
#define MHD_HTTP_HEADER_PRAGMA "Pragma"
#define MHD_HTTP_HEADER_PROXY_AUTHENTICATE "Proxy-Authenticate"
#define MHD_HTTP_HEADER_PROXY_AUTHORIZATION "Proxy-Authorization"
#define MHD_HTTP_HEADER_RANGE "Range"
/* This is not a typo, see HTTP spec */
#define MHD_HTTP_HEADER_REFERER "Referer"
#define MHD_HTTP_HEADER_RETRY_AFTER "Retry-After"
#define MHD_HTTP_HEADER_SERVER "Server"
#define MHD_HTTP_HEADER_SET_COOKIE "Set-Cookie"
#define MHD_HTTP_HEADER_SET_COOKIE2 "Set-Cookie2"
#define MHD_HTTP_HEADER_TE "TE"
#define MHD_HTTP_HEADER_TRAILER "Trailer"
#define MHD_HTTP_HEADER_TRANSFER_ENCODING "Transfer-Encoding"
#define MHD_HTTP_HEADER_UPGRADE "Upgrade"
#define MHD_HTTP_HEADER_USER_AGENT "User-Agent"
#define MHD_HTTP_HEADER_VARY "Vary"
#define MHD_HTTP_HEADER_VIA "Via"
#define MHD_HTTP_HEADER_WARNING "Warning"
#define MHD_HTTP_HEADER_WWW_AUTHENTICATE "WWW-Authenticate"
#define MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN "Access-Control-Allow-Origin"
/** @} */ /* end of group headers */
/**
* @defgroup versions HTTP versions
* These strings should be used to match against the first line of the
* HTTP header.
* @{
*/
#define MHD_HTTP_VERSION_1_0 "HTTP/1.0"
#define MHD_HTTP_VERSION_1_1 "HTTP/1.1"
/** @} */ /* end of group versions */
/**
* @defgroup methods HTTP methods
* Standard HTTP methods (as strings).
* @{
*/
#define MHD_HTTP_METHOD_CONNECT "CONNECT"
#define MHD_HTTP_METHOD_DELETE "DELETE"
#define MHD_HTTP_METHOD_GET "GET"
#define MHD_HTTP_METHOD_HEAD "HEAD"
#define MHD_HTTP_METHOD_OPTIONS "OPTIONS"
#define MHD_HTTP_METHOD_POST "POST"
#define MHD_HTTP_METHOD_PUT "PUT"
#define MHD_HTTP_METHOD_PATCH "PATCH"
#define MHD_HTTP_METHOD_TRACE "TRACE"
/** @} */ /* end of group methods */
/**
* @defgroup postenc HTTP POST encodings
* See also: http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4
* @{
*/
#define MHD_HTTP_POST_ENCODING_FORM_URLENCODED "application/x-www-form-urlencoded"
#define MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA "multipart/form-data"
/** @} */ /* end of group postenc */
/**
* @brief Handle for the daemon (listening on a socket for HTTP traffic).
* @ingroup event
*/
struct MHD_Daemon;
/**
* @brief 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.
* @ingroup request
*/
struct MHD_Connection;
/**
* @brief Handle for a response.
* @ingroup response
*/
struct MHD_Response;
/**
* @brief Handle for POST processing.
* @ingroup response
*/
struct MHD_PostProcessor;
/**
* @brief Flags for the `struct 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).
*/
enum MHD_FLAG
{
/**
* No options selected.
*/
MHD_NO_FLAG = 0,
/**
* Run in debug mode. If this flag is used, the library should
* print error messages and warnings to `stderr`.
*/
MHD_USE_DEBUG = 1,
/**
* Run in HTTPS mode.
*/
MHD_USE_SSL = 2,
/**
* Run using one thread per connection.
*/
MHD_USE_THREAD_PER_CONNECTION = 4,
/**
* Run using an internal thread (or thread pool) doing `select()`.
*/
MHD_USE_SELECT_INTERNALLY = 8,
/**
* Run using the IPv6 protocol (otherwise, MHD will just support
* IPv4). 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_IPv6 = 16,
/**
* 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_PEDANTIC_CHECKS = 32,
/**
* Use `poll()` instead of `select()`. This allows sockets with `fd >=
* FD_SETSIZE`. This option is not compatible with using an
* 'external' `select()` mode (as there is no API to get the file
* descriptors for the external select from MHD) and must also not
* be used in combination with #MHD_USE_EPOLL_LINUX_ONLY.
*/
MHD_USE_POLL = 64,
/**
* Run using an internal thread (or thread pool) doing `poll()`.
*/
MHD_USE_POLL_INTERNALLY = MHD_USE_SELECT_INTERNALLY | MHD_USE_POLL,
/**
* 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_SUPPRESS_DATE_NO_CLOCK = 128,
/**
* Run without a listen socket. This option only makes sense if
* #MHD_add_connection is 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_NO_LISTEN_SOCKET = 256,
/**
* Use `epoll()` instead of `select()` or `poll()` for the event loop.
* This option is only available on Linux; using the option on
* non-Linux systems will cause #MHD_start_daemon to fail.
*/
MHD_USE_EPOLL_LINUX_ONLY = 512,
/**
* Run using an internal thread (or thread pool) doing `epoll()`.
* This option is only available on Linux; using the option on
* non-Linux systems will cause #MHD_start_daemon to fail.
*/
MHD_USE_EPOLL_INTERNALLY_LINUX_ONLY = MHD_USE_SELECT_INTERNALLY | MHD_USE_EPOLL_LINUX_ONLY,
/**
* 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_SELECT_INTERNALLY 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 can be build for use a pair of sockets instead of a pipe.
* Pair of sockets is forced on W32.
*
* You must also use this option if you use internal select mode
* or a thread pool in conjunction with #MHD_add_connection.
*/
MHD_USE_PIPE_FOR_SHUTDOWN = 1024,
/**
* Use a single socket for IPv4 and IPv6.
*/
MHD_USE_DUAL_STACK = MHD_USE_IPv6 | 2048,
/**
* Enable `epoll()` turbo. Disables certain calls to `shutdown()`
* and enables aggressive non-blocking optimisitc reads.
* Most effects only happen with #MHD_USE_EPOLL_LINUX_ONLY.
* Enalbed always on W32 as winsock does not properly behave
* with `shutdown()` and this then fixes potential problems.
*/
MHD_USE_EPOLL_TURBO = 4096,
/**
* Enable suspend/resume functions, which also implies setting up
* pipes to signal resume.
*/
MHD_USE_SUSPEND_RESUME = 8192 | MHD_USE_PIPE_FOR_SHUTDOWN,
/**
* Enable TCP_FASTOPEN option. This option is only available on Linux with a
* kernel >= 3.6. On other systems, using this option cases #MHD_start_daemon
* to fail.
*/
MHD_USE_TCP_FASTOPEN = 16384
};
/**
* Type of a callback function used for logging by MHD.
*
* @param cls closure
* @param fm format string (`printf()`-style)
* @param ap arguments to @a fm
* @ingroup logging
*/
typedef void (*MHD_LogCallback)(void *cls, const char *fm, va_list ap);
/**
* @brief MHD options.
*
* Passed in the varargs portion of #MHD_start_daemon.
*/
enum MHD_OPTION
{
/**
* No more options / last option. This is used
* to terminate the VARARGs list.
*/
MHD_OPTION_END = 0,
/**
* Maximum memory size per connection (followed by a `size_t`).
* Default is 32 kb (#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_LIMIT = 1,
/**
* Maximum number of concurrent connections to
* accept (followed by an `unsigned int`).
*/
MHD_OPTION_CONNECTION_LIMIT = 2,
/**
* After how many seconds of inactivity should a
* connection automatically be timed out? (followed
* by an `unsigned int`; use zero for no timeout).
*/
MHD_OPTION_CONNECTION_TIMEOUT = 3,
/**
* 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_COMPLETED = 4,
/**
* 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_PER_IP_CONNECTION_LIMIT = 5,
/**
* Bind daemon to the supplied `struct sockaddr`. 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`.
*/
MHD_OPTION_SOCK_ADDR = 6,
/**
* 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_URI_LOG_CALLBACK = 7,
/**
* Memory pointer for the private key (key.pem) to be used by the
* HTTPS daemon. This option should be followed by a
* `const char *` argument.
* This should be used in conjunction with #MHD_OPTION_HTTPS_MEM_CERT.
*/
MHD_OPTION_HTTPS_MEM_KEY = 8,
/**
* Memory pointer for the certificate (cert.pem) to be used by the
* HTTPS daemon. This option should be followed by a
* `const char *` argument.
* This should be used in conjunction with #MHD_OPTION_HTTPS_MEM_KEY.
*/
MHD_OPTION_HTTPS_MEM_CERT = 9,
/**
* Daemon credentials type.
* Followed by an argument of type
* `gnutls_credentials_type_t`.
*/
MHD_OPTION_HTTPS_CRED_TYPE = 10,
/**
* Memory pointer to a `const char *` specifying the
* cipher algorithm (default: "NORMAL").
*/
MHD_OPTION_HTTPS_PRIORITIES = 11,
/**
* 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_LISTEN_SOCKET = 12,
/**
* 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 #MHD_LogCallback and the second a pointer
* `void *` which will be passed as the first argument to the log
* callback.
*
* Note that MHD will not generate any log messages
* if it was compiled without the "--enable-messages"
* flag being set.
*/
MHD_OPTION_EXTERNAL_LOGGER = 13,
/**
* 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_THREAD_POOL_SIZE = 14,
/**
* Additional options given in an array of `struct MHD_OptionItem`.
* The array must be terminated with an entry `{MHD_OPTION_END, 0, NULL}`.
* 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_ARRAY = 15,
/**
* 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 `struct 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_UNESCAPE_CALLBACK = 16,
/**
* Memory pointer for the random values to be used by the Digest
* Auth module. 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
* deamon is running.
*/
MHD_OPTION_DIGEST_AUTH_RANDOM = 17,
/**
* Size of the internal array holding the map of the nonce and
* the nonce counter. This option should be followed by an `unsigend int`
* argument.
*/
MHD_OPTION_NONCE_NC_SIZE = 18,
/**
* Desired size of the stack for threads created by MHD. Followed
* by an argument of type `size_t`. Use 0 for system default.
*/
MHD_OPTION_THREAD_STACK_SIZE = 19,
/**
* Memory pointer for the certificate (ca.pem) to be used by the
* HTTPS daemon for client authentification.
* This option should be followed by a `const char *` argument.
*/
MHD_OPTION_HTTPS_MEM_TRUST = 20,
/**
* Increment to use for growing the read buffer (followed by a
* `size_t`). Must fit within #MHD_OPTION_CONNECTION_MEMORY_LIMIT.
*/
MHD_OPTION_CONNECTION_MEMORY_INCREMENT = 21,
/**
* 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,
* #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_HTTPS_CERT_CALLBACK = 22,
/**
* When using #MHD_USE_TCP_FASTOPEN, this option changes the default TCP
* fastopen queue length of 50. Note that having a larger queue size can
* cause resource exhaustion attack as the TCP stack has to now allocate
* resources for the SYN packet along with its DATA. This option should be
* followed by an `unsigned int` argument.
*/
MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE = 23,
/**
* 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.
*/
MHD_OPTION_HTTPS_MEM_DHPARAMS = 24,
/**
* If present and set to true, allow reusing address:port socket
* (by using SO_REUSEPORT on most platform, or platform-specific ways).
* If present and set to false, disallow reusing address:port socket
* (does nothing on most plaform, but uses SO_EXCLUSIVEADDRUSE on Windows).
* This option must be followed by a `unsigned int` argument.
*/
MHD_OPTION_LISTENING_ADDRESS_REUSE = 25,
/**
* Memory pointer for a password that decrypts the private key (key.pem)
* to be used by the HTTPS daemon. This option should be followed by a
* `const char *` argument.
* This should be used in conjunction with #MHD_OPTION_HTTPS_MEM_KEY.
* @sa ::MHD_FEATURE_HTTPS_KEY_PASSWORD
*/
MHD_OPTION_HTTPS_KEY_PASSWORD = 26,
/**
* Register a function that should be called whenever a connection is
* started or closed.
*
* 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_NOTIFY_CONNECTION = 27
};
/**
* Entry in an #MHD_OPTION_ARRAY.
*/
struct MHD_OptionItem
{
/**
* Which option is being given. Use #MHD_OPTION_END
* to terminate the array.
*/
enum MHD_OPTION option;
/**
* Option value (for integer arguments, and for options requiring
* two pointer arguments); should be 0 for options that take no
* arguments or only a single pointer argument.
*/
intptr_t value;
/**
* Pointer option value (use NULL for options taking no arguments
* or only an integer option).
*/
void *ptr_value;
};
/**
* The `enum MHD_ValueKind` specifies the source of
* the key-value pairs in the HTTP protocol.
*/
enum MHD_ValueKind
{
/**
* Response header
*/
MHD_RESPONSE_HEADER_KIND = 0,
/**
* HTTP header.
*/
MHD_HEADER_KIND = 1,
/**
* Cookies. Note that the original HTTP header containing
* the cookie(s) will still be available and intact.
*/
MHD_COOKIE_KIND = 2,
/**
* 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_POSTDATA_KIND = 4,
/**
* GET (URI) arguments.
*/
MHD_GET_ARGUMENT_KIND = 8,
/**
* HTTP footer (only for HTTP 1.1 chunked encodings).
*/
MHD_FOOTER_KIND = 16
};
/**
* The `enum MHD_RequestTerminationCode` specifies reasons
* why a request has been terminated (or completed).
* @ingroup request
*/
enum MHD_RequestTerminationCode
{
/**
* We finished sending the response.
* @ingroup request
*/
MHD_REQUEST_TERMINATED_COMPLETED_OK = 0,
/**
* Error handling the connection (resources
* exhausted, other side closed connection,
* application error accepting request, etc.)
* @ingroup request
*/
MHD_REQUEST_TERMINATED_WITH_ERROR = 1,
/**
* No activity on the connection for the number
* of seconds specified using
* #MHD_OPTION_CONNECTION_TIMEOUT.
* @ingroup request
*/
MHD_REQUEST_TERMINATED_TIMEOUT_REACHED = 2,
/**
* We had to close the session since MHD was being
* shut down.
* @ingroup request
*/
MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN = 3,
/**
* We tried to read additional data, but the other side closed the
* connection. This error is similar to
* #MHD_REQUEST_TERMINATED_WITH_ERROR, but specific to the case where
* the connection died because the other side did not send expected
* data.
* @ingroup request
*/
MHD_REQUEST_TERMINATED_READ_ERROR = 4,
/**
* The client terminated the connection by closing the socket
* for writing (TCP half-closed); MHD aborted sending the
* response according to RFC 2616, section 8.1.4.
* @ingroup request
*/
MHD_REQUEST_TERMINATED_CLIENT_ABORT = 5
};
/**
* The `enum MHD_ConnectionNotificationCode` specifies types
* of connection notifications.
* @ingroup request
*/
enum MHD_ConnectionNotificationCode
{
/**
* A new connection has been started.
* @ingroup request
*/
MHD_CONNECTION_NOTIFY_STARTED = 0,
/**
* A connection is closed.
* @ingroup request
*/
MHD_CONNECTION_NOTIFY_CLOSED = 1
};
/**
* Information about a connection.
*/
union MHD_ConnectionInfo
{
/**
* Cipher algorithm used, as a string.
*/
const char* cipher_algorithm;
/**
* Protocol used, as a string.
*/
const char* protocol;
/**
* Connect socket
*/
MHD_socket connect_fd;
/**
* TLS session handle, of type "SSL".
*/
void * /* SSL */ tls_session;
/**
* TLS client certificate handle, of type "X509".
*/
void * /* X509 */ client_cert;
/**
* Address information for the client.
*/
struct sockaddr *client_addr;
/**
* Which daemon manages this connection (useful in case there are many
* daemons running).
*/
struct MHD_Daemon *daemon;
/**
* Socket-specific client context. Points to the same address as
* the "socket_context" of the #MHD_NotifyConnectionCallback.
*/
void **socket_context;
};
/**
* Values of this enum are used to specify what
* information about a connection is desired.
* @ingroup request
*/
enum MHD_ConnectionInfoType
{
/**
* What cipher algorithm is being used.
* Takes no extra arguments.
* @ingroup request
*/
MHD_CONNECTION_INFO_CIPHER_ALGO,
/**
*
* Takes no extra arguments.
* @ingroup request
*/
MHD_CONNECTION_INFO_PROTOCOL,
/**
* Obtain IP address of the client. Takes no extra arguments.
* Returns essentially a `struct sockaddr **` (since the API returns
* a `union MHD_ConnectionInfo *` and that union contains a `struct
* sockaddr *`).
* @ingroup request
*/
MHD_CONNECTION_INFO_CLIENT_ADDRESS,
/**
* Get the TLS session handle.
* @ingroup request
*/
MHD_CONNECTION_INFO_TLS_SESSION,
/**
* Get the gnuTLS client certificate handle. Dysfunctional (never
* implemented, deprecated). Use #MHD_CONNECTION_INFO_TLS_SESSION
* to get the `SSL` and then call
* SSL_get_peer_certificate() or SSL_get_peer_cert_chain().
*/
MHD_CONNECTION_INFO_TLS_CLIENT_CERT,
/**
* Get the `struct MHD_Daemon *` responsible for managing this connection.
* @ingroup request
*/
MHD_CONNECTION_INFO_DAEMON,
/**
* Request the file descriptor for the listening socket.
* No extra arguments should be passed.
* @ingroup request
*/
MHD_CONNECTION_INFO_CONNECTION_FD,
/**
* 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.
*/
MHD_CONNECTION_INFO_SOCKET_CONTEXT
};
/**
* Values of this enum are used to specify what
* information about a deamon is desired.
*/
enum MHD_DaemonInfoType
{
/**
* No longer supported (will return NULL).
*/
MHD_DAEMON_INFO_KEY_SIZE,
/**
* No longer supported (will return NULL).
*/
MHD_DAEMON_INFO_MAC_KEY_SIZE,
/**
* Request the file descriptor for the listening socket.
* No extra arguments should be passed.
*/
MHD_DAEMON_INFO_LISTEN_FD,
/**
* Request the file descriptor for the external epoll.
* No extra arguments should be passed.
*/
MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY,
/**
* Request the number of current connections handled by the daemon.
* No extra arguments should be passed.
*/
MHD_DAEMON_INFO_CURRENT_CONNECTIONS
};
/**
* Callback for serious error condition. The default action is to print
* an error message and `abort()`.
*
* @param cls user specified value
* @param file where the error occured
* @param line where the error occured
* @param reason error detail, may be NULL
* @ingroup logging
*/
typedef void
(*MHD_PanicCallback) (void *cls,
const char *file,
unsigned int line,
const char *reason);
/**
* Allow or deny a client to connect.
*
* @param cls closure
* @param addr address information from the client
* @param addrlen length of @a addr
* @return #MHD_YES if connection is allowed, #MHD_NO if not
*/
typedef int
(*MHD_AcceptPolicyCallback) (void *cls,
const struct sockaddr *addr,
socklen_t addrlen);
/**
* A client has requested the given url using the given method
* (#MHD_HTTP_METHOD_GET, #MHD_HTTP_METHOD_PUT,
* #MHD_HTTP_METHOD_DELETE, #MHD_HTTP_METHOD_POST, etc). The callback
* must call MHD callbacks to provide content to give back to the
* client and return an HTTP status code (i.e. #MHD_HTTP_OK,
* #MHD_HTTP_NOT_FOUND, etc.).
*
* @param cls argument given together with the function
* pointer when the handler was registered with MHD
* @param url the requested url
* @param method the HTTP method used (#MHD_HTTP_METHOD_GET,
* #MHD_HTTP_METHOD_PUT, etc.)
* @param version the HTTP version string (i.e.
* #MHD_HTTP_VERSION_1_1)
* @param upload_data the data being uploaded (excluding HEADERS,
* for a POST that fits into memory and that is encoded
* with a supported encoding, the POST data will NOT be
* given in upload_data and is instead available as
* part of #MHD_get_connection_values; very large POST
* data *will* be made available incrementally in
* @a upload_data)
* @param upload_data_size set initially to the size of the
* @a upload_data provided; the method must update this
* value to the number of bytes NOT processed;
* @param con_cls pointer that the 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).
* Initially, `*con_cls` will be NULL.
* @return #MHD_YES if the connection was handled successfully,
* #MHD_NO if the socket must be closed due to a serios
* error while handling the request
*/
typedef 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);
/**
* Signature of the callback used by MHD to notify the
* application about completed requests.
*
* @param cls client-defined closure
* @param connection connection handle
* @param con_cls value as set by the last call to
* the #MHD_AccessHandlerCallback
* @param toe reason for request termination
* @see #MHD_OPTION_NOTIFY_COMPLETED
* @ingroup request
*/
typedef void
(*MHD_RequestCompletedCallback) (void *cls,
struct MHD_Connection *connection,
void **con_cls,
enum MHD_RequestTerminationCode toe);
/**
* Signature of the callback used by MHD to notify the
* application about started/stopped connections
*
* @param cls client-defined closure
* @param connection connection handle
* @param socket_context socket-specific pointer where the
* client can associate some state specific
* to the TCP connection; note that this is
* different from the "con_cls" which is per
* HTTP request. The client can initialize
* during #MHD_CONNECTION_NOTIFY_STARTED and
* cleanup during #MHD_CONNECTION_NOTIFY_CLOSED
* and access in the meantime using
* #MHD_CONNECTION_INFO_SOCKET_CONTEXT.
* @param toe reason for connection notification
* @see #MHD_OPTION_NOTIFY_CONNECTION
* @ingroup request
*/
typedef void
(*MHD_NotifyConnectionCallback) (void *cls,
struct MHD_Connection *connection,
void **socket_context,
enum MHD_ConnectionNotificationCode toe);
/**
* 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.
*
* @param cls closure
* @param kind kind of the header we are looking at
* @param key key for the value, can be an empty string
* @param value corresponding value, can be NULL
* @return #MHD_YES to continue iterating,
* #MHD_NO to abort the iteration
* @ingroup request
*/
typedef int
(*MHD_KeyValueIterator) (void *cls,
enum MHD_ValueKind kind,
const char *key,
const char *value);
/**
* Callback used by libmicrohttpd in order to obtain content. The
* callback is to copy at most @a max bytes of content into @a buf. The
* total number of bytes that has been placed into @a buf should be
* returned.
*
* Note that returning zero will cause libmicrohttpd to try again.
* Thus, returning zero should only be used in conjunction
* with MHD_suspend_connection() to avoid busy waiting.
*
* @param cls extra argument to the callback
* @param pos position in the datastream to access;
* note that if a `struct 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 a `struct MHD_Response` is not re-used,
* libmicrohttpd guarantees that "pos" will be
* the sum of all non-negative return values
* obtained from the content reader so far.
* @param buf where to copy the data
* @param max maximum number of bytes to copy to @a buf (size of @a buf)
* @return number of bytes written to @a buf;
* 0 is legal unless we are running in internal select mode (since
* this would cause busy-waiting); 0 in external select mode
* will cause this function to be called again once the external
* select calls MHD again;
* #MHD_CONTENT_READER_END_OF_STREAM (-1) 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) 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.
*/
typedef ssize_t
(*MHD_ContentReaderCallback) (void *cls,
uint64_t pos,
char *buf,
size_t max);
/**
* This method is called by libmicrohttpd if we
* are done with a content reader. It should
* be used to free resources associated with the
* content reader.
*
* @param cls closure
* @ingroup response
*/
typedef void
(*MHD_ContentReaderFreeCallback) (void *cls);
/**
* 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.
*
* @param cls user-specified closure
* @param kind type of the value, always #MHD_POSTDATA_KIND when called from MHD
* @param key 0-terminated key for the value
* @param filename name of the uploaded file, NULL if not known
* @param content_type mime-type of the data, NULL if not known
* @param transfer_encoding encoding of the data, NULL if not known
* @param data pointer to @a size bytes of data at the
* specified offset
* @param off offset of data in the overall value
* @param size number of bytes in @a data available
* @return #MHD_YES to continue iterating,
* #MHD_NO to abort the iteration
*/
typedef 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);
/* **************** Daemon handling functions ***************** */
/**
* Start a webserver on the given port.
*
* @param flags combination of `enum MHD_FLAG` values
* @param port port to bind to (in host byte order)
* @param 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
* @param apc_cls extra argument to apc
* @param dh handler called for all requests (repeatedly)
* @param dh_cls extra argument to @a dh
* @param ap list of options (type-value pairs,
* terminated with #MHD_OPTION_END).
* @return NULL on error, handle to daemon on success
* @ingroup event
*/
_MHD_EXTERN struct MHD_Daemon *
MHD_start_daemon_va (unsigned int flags,
uint16_t port,
MHD_AcceptPolicyCallback apc, void *apc_cls,
MHD_AccessHandlerCallback dh, void *dh_cls,
va_list ap);
/**
* Start a webserver on the given port. Variadic version of
* #MHD_start_daemon_va.
*
* @param flags combination of `enum MHD_FLAG` values
* @param port port to bind to
* @param 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
* @param apc_cls extra argument to apc
* @param dh handler called for all requests (repeatedly)
* @param dh_cls extra argument to @a dh
* @return NULL on error, handle to daemon on success
* @ingroup event
*/
_MHD_EXTERN struct MHD_Daemon *
MHD_start_daemon (unsigned int flags,
uint16_t port,
MHD_AcceptPolicyCallback apc, void *apc_cls,
MHD_AccessHandlerCallback dh, void *dh_cls,
...);
/**
* 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).
*
* Note that some thread modes require the caller to have passed
* #MHD_USE_PIPE_FOR_SHUTDOWN when using this API. If this daemon is
* in one of those modes and this option was not given to
* #MHD_start_daemon, this function will return #MHD_INVALID_SOCKET.
*
* @param daemon daemon to stop accepting new connections for
* @return old listen socket on success, #MHD_INVALID_SOCKET if
* the daemon was already not listening anymore
* @ingroup specialized
*/
_MHD_EXTERN MHD_socket
MHD_quiesce_daemon (struct MHD_Daemon *daemon);
/**
* Shutdown an HTTP daemon.
*
* @param daemon daemon to stop
* @ingroup event
*/
_MHD_EXTERN void
MHD_stop_daemon (struct MHD_Daemon *daemon);
/**
* 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.
*
* Per-IP connection limits are ignored when using this API.
*
* @param daemon daemon that manages the connection
* @param client_socket socket to manage (MHD will expect
* to receive an HTTP request from this socket next).
* @param addr IP address of the client
* @param addrlen number of bytes in @a addr
* @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.
* @ingroup specialized
*/
_MHD_EXTERN int
MHD_add_connection (struct MHD_Daemon *daemon,
MHD_socket client_socket,
const struct sockaddr *addr,
socklen_t addrlen);
/**
* Obtain the `select()` sets for this daemon.
* Daemon's FDs will be added to fd_sets. To get only
* daemon FDs in fd_sets, call FD_ZERO for each fd_set
* before calling this function. FD_SETSIZE is assumed
* to be platform's default.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @return #MHD_YES on success, #MHD_NO if this
* daemon was not started with the right
* options for this call or any FD didn't
* fit fd_set.
* @ingroup event
*/
_MHD_EXTERN int
MHD_get_fdset (struct MHD_Daemon *daemon,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *except_fd_set,
MHD_socket *max_fd);
/**
* Obtain the `select()` sets for this daemon.
* Daemon's FDs will be added to fd_sets. To get only
* daemon FDs in fd_sets, call FD_ZERO for each fd_set
* before calling this function. Passing custom FD_SETSIZE
* as @a fd_setsize allow usage of larger/smaller than
* platform's default fd_sets.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @param fd_setsize value of FD_SETSIZE
* @return #MHD_YES on success, #MHD_NO if this
* daemon was not started with the right
* options for this call or any FD didn't
* fit fd_set.
* @ingroup event
*/
_MHD_EXTERN int
MHD_get_fdset2 (struct MHD_Daemon *daemon,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *except_fd_set,
MHD_socket *max_fd,
unsigned int fd_setsize);
/**
* Obtain the `select()` sets for this daemon.
* Daemon's FDs will be added to fd_sets. To get only
* daemon FDs in fd_sets, call FD_ZERO for each fd_set
* before calling this function. Size of fd_set is
* determined by current value of FD_SETSIZE.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @return #MHD_YES on success, #MHD_NO if this
* daemon was not started with the right
* options for this call or any FD didn't
* fit fd_set.
* @ingroup event
*/
#define MHD_get_fdset(daemon,read_fd_set,write_fd_set,except_fd_set,max_fd) \
MHD_get_fdset2((daemon),(read_fd_set),(write_fd_set),(except_fd_set),(max_fd),FD_SETSIZE)
/**
* Obtain timeout value for `select()` for this daemon (only needed if
* connection timeout is used). The returned value is how many milliseconds
* `select()` or `poll()` should at most block, not the timeout value set for
* connections. This function MUST NOT be called if MHD is running with
* #MHD_USE_THREAD_PER_CONNECTION.
*
* @param daemon daemon to query for timeout
* @param timeout 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).
* @ingroup event
*/
_MHD_EXTERN int
MHD_get_timeout (struct MHD_Daemon *daemon,
MHD_UNSIGNED_LONG_LONG *timeout);
/**
* 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 is a convenience method, which is useful if the
* fd_sets from #MHD_get_fdset were not directly passed to `select()`;
* with this function, MHD will internally do the appropriate `select()`
* call itself again. While it is always safe to call #MHD_run (in
* external select mode), you should call #MHD_run_from_select if
* performance is important (as it saves an expensive call to
* `select()`).
*
* @param daemon daemon to run
* @return #MHD_YES on success, #MHD_NO if this
* daemon was not started with the right
* options for this call.
* @ingroup event
*/
_MHD_EXTERN int
MHD_run (struct MHD_Daemon *daemon);
/**
* Run webserver operations. This method should be called by clients
* in combination with #MHD_get_fdset if the client-controlled 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.
*
* @param daemon daemon to run select loop for
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set (not used, can be NULL)
* @return #MHD_NO on serious errors, #MHD_YES on success
* @ingroup event
*/
_MHD_EXTERN 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);
/* **************** Connection handling functions ***************** */
/**
* Get all of the headers from the request.
*
* @param connection connection to get values from
* @param kind types of values to iterate over
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to @a iterator
* @return number of entries iterated over
* @ingroup request
*/
_MHD_EXTERN int
MHD_get_connection_values (struct MHD_Connection *connection,
enum MHD_ValueKind kind,
MHD_KeyValueIterator iterator, void *iterator_cls);
/**
* This function can be used to add an entry to the HTTP headers of a
* connection (so that the #MHD_get_connection_values function will
* return them -- and the `struct 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.).
*
* @param connection the connection for which a
* value should be set
* @param kind kind of the value
* @param key key for the value
* @param value the value itself
* @return #MHD_NO if the operation could not be
* performed due to insufficient memory;
* #MHD_YES on success
* @ingroup request
*/
_MHD_EXTERN int
MHD_set_connection_value (struct MHD_Connection *connection,
enum MHD_ValueKind kind,
const char *key,
const char *value);
/**
* Sets the global error handler to a different implementation. @a cb
* will only be called in the case of typically fatal, serious
* internal consistency issues. These issues should only arise in the
* case of serious memory corruption or similar problems with the
* architecture. While @a cb is allowed to return and MHD will then
* try to continue, this is never safe.
*
* The default implementation that is used if no panic function is set
* simply prints an error message and calls `abort()`. Alternative
* implementations might call `exit()` or other similar functions.
*
* @param cb new error handler
* @param cls passed to @a cb
* @ingroup logging
*/
_MHD_EXTERN void
MHD_set_panic_func (MHD_PanicCallback cb, void *cls);
/**
* 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.
*
* @param val value to unescape (modified in the process)
* @return length of the resulting val (`strlen(val)` may be
* shorter afterwards due to elimination of escape sequences)
*/
_MHD_EXTERN size_t
MHD_http_unescape (char *val);
/**
* Get a particular header value. If multiple
* values match the kind, return any one of them.
*
* @param connection connection to get values from
* @param kind what kind of value are we looking for
* @param key the header to look for, NULL to lookup 'trailing' value without a key
* @return NULL if no such item was found
* @ingroup request
*/
_MHD_EXTERN const char *
MHD_lookup_connection_value (struct MHD_Connection *connection,
enum MHD_ValueKind kind,
const char *key);
/**
* Queue a response to be transmitted to the client (as soon as
* possible but after #MHD_AccessHandlerCallback returns).
*
* @param connection the connection identifying the client
* @param status_code HTTP status code (i.e. #MHD_HTTP_OK)
* @param response response to transmit
* @return #MHD_NO on error (i.e. reply already sent),
* #MHD_YES on success or if message has been queued
* @ingroup response
*/
_MHD_EXTERN int
MHD_queue_response (struct MHD_Connection *connection,
unsigned int status_code,
struct MHD_Response *response);
/**
* 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_PIPE_FOR_SHUTDOWN 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.
*
* @param connection the connection to suspend
*/
_MHD_EXTERN void
MHD_suspend_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.
*
* @param connection the connection to resume
*/
_MHD_EXTERN void
MHD_resume_connection (struct MHD_Connection *connection);
/* **************** Response manipulation functions ***************** */
/**
* Flags for special handling of responses.
*/
enum MHD_ResponseFlags
{
/**
* Default: no special flags.
*/
MHD_RF_NONE = 0,
/**
* 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.
*/
MHD_RF_HTTP_VERSION_1_0_ONLY = 1
};
/**
* MHD options (for future extensions).
*/
enum MHD_ResponseOptions
{
/**
* End of the list of options.
*/
MHD_RO_END = 0
};
/**
* Set special flags and options for a response.
*
* @param response the response to modify
* @param flags to set for the response
* @param ... #MHD_RO_END terminated list of options
* @return #MHD_YES on success, #MHD_NO on error
*/
_MHD_EXTERN int
MHD_set_response_options (struct MHD_Response *response,
enum MHD_ResponseFlags flags,
...);
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response, #MHD_SIZE_UNKNOWN for unknown
* @param block_size preferred block size for querying crc (advisory only,
* MHD may still call @a 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
* @param crc callback to use to obtain response data
* @param crc_cls extra argument to @a crc
* @param crfc callback to call to free @a crc_cls resources
* @return NULL on error (i.e. invalid arguments, out of memory)
* @ingroup response
*/
_MHD_EXTERN 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 be used any number of times.
*
* @param size size of the @a data portion of the response
* @param data the data itself
* @param must_free libmicrohttpd should free data when done
* @param must_copy libmicrohttpd must make a copy of @a data
* right away, the data maybe released anytime after
* this call returns
* @return NULL on error (i.e. invalid arguments, out of memory)
* @deprecated use #MHD_create_response_from_buffer instead
* @ingroup response
*/
_MHD_EXTERN struct MHD_Response *
MHD_create_response_from_data (size_t size,
void *data,
int must_free,
int must_copy);
/**
* Specification for how MHD should treat the memory buffer
* given for the response.
* @ingroup response
*/
enum MHD_ResponseMemoryMode
{
/**
* 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.
* @ingroup response
*/
MHD_RESPMEM_PERSISTENT,
/**
* 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).
* @ingroup response
*/
MHD_RESPMEM_MUST_FREE,
/**
* 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.
* @ingroup response
*/
MHD_RESPMEM_MUST_COPY
};
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response
* @param buffer size bytes containing the response's data portion
* @param mode flags for buffer management
* @return NULL on error (i.e. invalid arguments, out of memory)
* @ingroup response
*/
_MHD_EXTERN struct MHD_Response *
MHD_create_response_from_buffer (size_t size,
void *buffer,
enum MHD_ResponseMemoryMode mode);
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response
* @param fd file descriptor referring to a file on disk with the
* data; will be closed when response is destroyed;
* fd should be in 'blocking' mode
* @return NULL on error (i.e. invalid arguments, out of memory)
* @ingroup response
*/
_MHD_EXTERN struct MHD_Response *
MHD_create_response_from_fd (size_t size,
int fd);
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response
* @param fd file descriptor referring to a file on disk with the
* data; will be closed when response is destroyed;
* fd should be in 'blocking' mode
* @param offset offset to start reading from in the file;
* Be careful! `off_t` may have been compiled to be a
* 64-bit variable for MHD, in which case your application
* also has to be compiled using the same options! Read
* the MHD manual for more details.
* @return NULL on error (i.e. invalid arguments, out of memory)
* @ingroup response
*/
_MHD_EXTERN struct MHD_Response *
MHD_create_response_from_fd_at_offset (size_t size,
int fd,
off_t offset);
#if 0
/**
* Enumeration for actions MHD should perform on the underlying socket
* of the upgrade. This API is not finalized, and in particular
* the final set of actions is yet to be decided. This is just an
* idea for what we might want.
*/
enum MHD_UpgradeAction
{
/**
* Close the socket, the application is done with it.
*
* Takes no extra arguments.
*
* NOTE: it is unclear if we want to have this in the
* "final" API, this is all just ideas.
*/
MHD_UPGRADE_ACTION_CLOSE = 0,
/**
* Uncork the TCP write buffer (that is, tell the OS to transmit all
* bytes in the buffer now, and to not use TCP-CORKing).
*
* Takes no extra arguments.
*
* NOTE: it is unclear if we want to have this in the
* "final" API, this is all just ideas.
*/
MHD_UPGRADE_ACTION_CORK
};
/**
* This connection-specific callback is provided by MHD to
* applications (unusual) during the #MHD_UpgradeHandler.
* It allows applications to perform 'special' actions on
* the underlying socket from the upgrade.
*
* @param cls the closure (from `upgrade_action_cls`)
* @param action which action should be performed
* @param ... arguments to the action (depends on the action)
* @return #MHD_NO on error, #MHD_YES on success
*/
typedef int
(*MHD_UpgradeActionCallback)(void *cls,
enum MHD_UpgradeAction action,
...);
/**
* Function called after a protocol "upgrade" response was sent
* successfully and the socket should now be controlled by some
* protocol other than HTTP.
*
* Any data received on the socket will be made available in
* 'data_in'. The function should update 'data_in_size' to
* reflect the number of bytes consumed from 'data_in' (the remaining
* bytes will be made available in the next call to the handler).
*
* Any data that should be transmitted on the socket should be
* stored in 'data_out'. '*data_out_size' is initially set to
* the available buffer space in 'data_out'. It should be set to
* the number of bytes stored in 'data_out' (which can be zero).
*
* The return value is a BITMASK that indicates how the function
* intends to interact with the event loop. It can request to be
* notified for reading, writing, request to UNCORK the send buffer
* (which MHD is allowed to ignore, if it is not possible to uncork on
* the local platform), to wait for the 'external' select loop to
* trigger another round. It is also possible to specify "no events"
* to terminate the connection; in this case, the
* #MHD_RequestCompletedCallback will be called and all resources of
* the connection will be released.
*
* Except when in 'thread-per-connection' mode, implementations
* of this function should never block (as it will still be called
* from within the main event loop).
*
* @param cls closure
* @param connection original HTTP connection handle,
* giving the function a last chance
* to inspect the original HTTP request
* @param sock socket to use for bi-directional communication
* with the client. For HTTPS, this may not be a socket
* that is directly connected to the client and thus certain
* operations (TCP-specific setsockopt(), getsockopt(), etc.)
* may not work as expected (as the socket could be from a
* socketpair() or a TCP-loopback)
* @param upgrade_action function that can be used to perform actions
* on the @a sock (like those that cannot be done explicitly).
* Applications must use this callback to perform the
* close() action on the @a sock.
* @param upgrade_action_cls closure that must be passed to @a upgrade_action
*/
typedef void
(*MHD_UpgradeHandler)(void *cls,
struct MHD_Connection *connection,
MHD_SOCKET sock,
MHD_UpgradeActionCallback upgrade_action,
void *upgrade_action_cls);
/**
* Create a response object that can be used for 101 UPGRADE
* responses, for example to implement WebSockets. After sending the
* response, control over the data stream is given to the callback (which
* can then, for example, start some bi-directional communication).
* If the response is queued for multiple connections, the callback
* will be called for each connection. The callback
* will ONLY be called after the response header was successfully passed
* to the OS; if there are communication errors before, the usual MHD
* connection error handling code will be performed.
*
* Setting the correct HTTP code (i.e. MHD_HTTP_SWITCHING_PROTOCOLS)
* and setting correct HTTP headers for the upgrade must be done
* manually (this way, it is possible to implement most existing
* WebSocket versions using this API; in fact, this API might be useful
* for any protocol switch, not just WebSockets). Note that
* draft-ietf-hybi-thewebsocketprotocol-00 cannot be implemented this
* way as the header "HTTP/1.1 101 WebSocket Protocol Handshake"
* cannot be generated; instead, MHD will always produce "HTTP/1.1 101
* Switching Protocols" (if the response code 101 is used).
*
* As usual, the response object can be extended with header
* information and then be used any number of times (as long as the
* header information is not connection-specific).
*
* @param upgrade_handler function to call with the 'upgraded' socket
* @param upgrade_handler_cls closure for @a upgrade_handler
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *
MHD_create_response_for_upgrade (MHD_UpgradeHandler upgrade_handler,
void *upgrade_handler_cls);
#endif
/**
* Destroy a response object and associated resources. Note that
* libmicrohttpd 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 immediatley.
*
* @param response response to destroy
* @ingroup response
*/
_MHD_EXTERN void
MHD_destroy_response (struct MHD_Response *response);
/**
* Add a header line to the response.
*
* @param response response to add a header to
* @param header the header to add
* @param content value to add
* @return #MHD_NO on error (i.e. invalid header or content format),
* or out of memory
* @ingroup response
*/
_MHD_EXTERN int
MHD_add_response_header (struct MHD_Response *response,
const char *header,
const char *content);
/**
* Add a footer line to the response.
*
* @param response response to remove a header from
* @param footer the footer to delete
* @param content value to delete
* @return #MHD_NO on error (i.e. invalid footer or content format).
* @ingroup response
*/
_MHD_EXTERN int
MHD_add_response_footer (struct MHD_Response *response,
const char *footer,
const char *content);
/**
* Delete a header (or footer) line from the response.
*
* @param response response to remove a header from
* @param header the header to delete
* @param content value to delete
* @return #MHD_NO on error (no such header known)
* @ingroup response
*/
_MHD_EXTERN int
MHD_del_response_header (struct MHD_Response *response,
const char *header,
const char *content);
/**
* Get all of the headers (and footers) added to a response.
*
* @param response response to query
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to @a iterator
* @return number of entries iterated over
* @ingroup response
*/
_MHD_EXTERN int
MHD_get_response_headers (struct MHD_Response *response,
MHD_KeyValueIterator iterator, void *iterator_cls);
/**
* Get a particular header (or footer) from the response.
*
* @param response response to query
* @param key which header to get
* @return NULL if header does not exist
* @ingroup response
*/
_MHD_EXTERN const char *
MHD_get_response_header (struct MHD_Response *response,
const char *key);
/* ********************** PostProcessor functions ********************** */
/**
* Create a `struct MHD_PostProcessor`.
*
* A `struct MHD_PostProcessor` can be used to (incrementally) parse
* the data portion of a POST request. Note that some buggy browsers
* fail to set the encoding type. If you want to support those, you
* may have to call #MHD_set_connection_value with the proper encoding
* type before creating a post processor (if no supported encoding
* type is set, this function will fail).
*
* @param connection the connection on which the POST is
* happening (used to determine the POST format)
* @param 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 32 or 64k (i.e. 65536).
* @param iter iterator to be called with the parsed data,
* Must NOT be NULL.
* @param iter_cls first argument to @a iter
* @return NULL on error (out of memory, unsupported encoding),
* otherwise a PP handle
* @ingroup request
*/
_MHD_EXTERN struct MHD_PostProcessor *
MHD_create_post_processor (struct MHD_Connection *connection,
size_t buffer_size,
MHD_PostDataIterator iter, void *iter_cls);
/**
* 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_PostDataIterator.
*
* @param pp the post processor
* @param post_data @a post_data_len bytes of POST data
* @param post_data_len length of @a post_data
* @return #MHD_YES on success, #MHD_NO on error
* (out-of-memory, iterator aborted, parse error)
* @ingroup request
*/
_MHD_EXTERN int
MHD_post_process (struct MHD_PostProcessor *pp,
const char *post_data, size_t post_data_len);
/**
* Release PostProcessor resources.
*
* @param pp the PostProcessor to destroy
* @return #MHD_YES if processing completed nicely,
* #MHD_NO if there were spurious characters / formatting
* problems; it is common to ignore the return
* value of this function
* @ingroup request
*/
_MHD_EXTERN int
MHD_destroy_post_processor (struct MHD_PostProcessor *pp);
/* ********************* Digest Authentication functions *************** */
/**
* Constant to indicate that the nonce of the provided
* authentication code was wrong.
* @ingroup authentication
*/
#define MHD_INVALID_NONCE -1
/**
* Get the username from the authorization header sent by the client
*
* @param connection The MHD connection structure
* @return NULL if no username could be found, a pointer
* to the username if found
* @ingroup authentication
*/
_MHD_EXTERN char *
MHD_digest_auth_get_username (struct MHD_Connection *connection);
/**
* Authenticates the authorization header sent by the client
*
* @param connection The MHD connection structure
* @param realm The realm presented to the client
* @param username The username needs to be authenticated
* @param password The password used in the authentication
* @param nonce_timeout The amount of time for a nonce to be
* invalid in seconds
* @return #MHD_YES if authenticated, #MHD_NO if not,
* #MHD_INVALID_NONCE if nonce is invalid
* @ingroup authentication
*/
_MHD_EXTERN int
MHD_digest_auth_check (struct MHD_Connection *connection,
const char *realm,
const char *username,
const char *password,
unsigned int nonce_timeout);
/**
* Queues a response to request authentication from the client
*
* @param connection The MHD connection structure
* @param realm The realm presented to the client
* @param opaque string to user for opaque value
* @param response reply to send; should contain the "access denied"
* body; note that this function will set the "WWW Authenticate"
* header and that the caller should not do this
* @param signal_stale #MHD_YES if the nonce is invalid to add
* 'stale=true' to the authentication header
* @return #MHD_YES on success, #MHD_NO otherwise
* @ingroup authentication
*/
_MHD_EXTERN int
MHD_queue_auth_fail_response (struct MHD_Connection *connection,
const char *realm,
const char *opaque,
struct MHD_Response *response,
int signal_stale);
/**
* Get the username and password from the basic authorization header sent by the client
*
* @param connection The MHD connection structure
* @param password a pointer for the password
* @return NULL if no username could be found, a pointer
* to the username if found
* @ingroup authentication
*/
_MHD_EXTERN char *
MHD_basic_auth_get_username_password (struct MHD_Connection *connection,
char** password);
/**
* Queues a response to request basic authentication from the client
* The given response object is expected to include the payload for
* the response; the "WWW-Authenticate" header will be added and the
* response queued with the 'UNAUTHORIZED' status code.
*
* @param connection The MHD connection structure
* @param realm the realm presented to the client
* @param response response object to modify and queue
* @return #MHD_YES on success, #MHD_NO otherwise
* @ingroup authentication
*/
_MHD_EXTERN int
MHD_queue_basic_auth_fail_response (struct MHD_Connection *connection,
const char *realm,
struct MHD_Response *response);
/* ********************** generic query functions ********************** */
/**
* Obtain information about the given connection.
*
* @param connection what connection to get information about
* @param info_type what information is desired?
* @param ... depends on @a info_type
* @return NULL if this information is not available
* (or if the @a info_type is unknown)
* @ingroup specialized
*/
_MHD_EXTERN const union MHD_ConnectionInfo *
MHD_get_connection_info (struct MHD_Connection *connection,
enum MHD_ConnectionInfoType info_type,
...);
/**
* MHD connection options. Given to #MHD_set_connection_option to
* set custom options for a particular connection.
*/
enum MHD_CONNECTION_OPTION
{
/**
* Set a custom timeout for the given connection. Specified
* as the number of seconds, given as an `unsigned int`. Use
* zero for no timeout.
*/
MHD_CONNECTION_OPTION_TIMEOUT
};
/**
* Set a custom option for the given connection, overriding defaults.
*
* @param connection connection to modify
* @param option option to set
* @param ... arguments to the option, depending on the option type
* @return #MHD_YES on success, #MHD_NO if setting the option failed
* @ingroup specialized
*/
_MHD_EXTERN int
MHD_set_connection_option (struct MHD_Connection *connection,
enum MHD_CONNECTION_OPTION option,
...);
/**
* Information about an MHD daemon.
*/
union MHD_DaemonInfo
{
/**
* Size of the key, no longer supported.
* @deprecated
*/
size_t key_size;
/**
* Size of the mac key, no longer supported.
* @deprecated
*/
size_t mac_key_size;
/**
* Listen socket file descriptor, for #MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY
* and #MHD_DAEMON_INFO_LISTEN_FD.
*/
MHD_socket listen_fd;
/**
* Number of active connections, for #MHD_DAEMON_INFO_CURRENT_CONNECTIONS.
*/
unsigned int num_connections;
};
/**
* Obtain information about the given daemon
* (not fully implemented!).
*
* @param daemon what daemon to get information about
* @param info_type what information is desired?
* @param ... depends on @a info_type
* @return NULL if this information is not available
* (or if the @a info_type is unknown)
* @ingroup specialized
*/
_MHD_EXTERN const union MHD_DaemonInfo *
MHD_get_daemon_info (struct MHD_Daemon *daemon,
enum MHD_DaemonInfoType info_type,
...);
/**
* Obtain the version of this library
*
* @return static version string, e.g. "0.9.9"
* @ingroup specialized
*/
_MHD_EXTERN const char*
MHD_get_version (void);
/**
* Types of information about MHD features,
* used by #MHD_is_feature_supported().
*/
enum MHD_FEATURE
{
/**
* Get whether messages are supported. If supported then in debug
* mode messages can be printed to stderr or to external logger.
*/
MHD_FEATURE_MESSGES = 1,
/**
* 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_SSL = 2,
/**
* Get whether option #MHD_OPTION_HTTPS_CERT_CALLBACK is
* supported.
*/
MHD_FEATURE_HTTPS_CERT_CALLBACK = 3,
/**
* Get whether IPv6 is supported. If supported then flag
* #MHD_USE_IPv6 can be used.
*/
MHD_FEATURE_IPv6 = 4,
/**
* 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_IPv6_ONLY = 5,
/**
* Get whether `poll()` is supported. If supported then flag
* #MHD_USE_POLL can be used.
*/
MHD_FEATURE_POLL = 6,
/**
* 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_EPOLL = 7,
/**
* 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_SHUTDOWN_LISTEN_SOCKET = 8,
/**
* Get whether socketpair is used internally instead of pipe to
* signal other threads.
*/
MHD_FEATURE_SOCKETPAIR = 9,
/**
* 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_TCP_FASTOPEN = 10,
/**
* 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_BASIC_AUTH = 11,
/**
* Get whether HTTP Digest authorization is supported. If
* supported then options #MHD_OPTION_DIGEST_AUTH_RANDOM,
* #MHD_OPTION_NONCE_NC_SIZE and
* #MHD_digest_auth_check() can be used.
*/
MHD_FEATURE_DIGEST_AUTH = 12,
/**
* Get whether postprocessor is supported. If supported then
* functions #MHD_create_post_processor(), #MHD_post_process() and
* #MHD_destroy_post_processor() can
* be used.
*/
MHD_FEATURE_POSTPROCESSOR = 13,
/**
* Get whether password encrypted private key for HTTPS daemon is
* supported. If supported then option
* ::MHD_OPTION_HTTPS_KEY_PASSWORD can be used.
*/
MHD_FEATURE_HTTPS_KEY_PASSWORD = 14
};
/**
* Get information about supported MHD features.
* Indicate that MHD was compiled with or without support for
* particular feature. Some features require additional support
* by kernel. Kernel support is not checked by this function.
*
* @param feature type of requested information
* @return #MHD_YES if feature is supported by MHD, #MHD_NO if
* feature is not supported or feature is unknown.
* @ingroup specialized
*/
_MHD_EXTERN int
MHD_is_feature_supported(enum MHD_FEATURE feature);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
#endif