/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/bio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#if !defined(OPENSSL_WINDOWS)
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#else
OPENSSL_MSVC_PRAGMA(warning(push, 3))
#include <winsock2.h>
#include <ws2tcpip.h>
OPENSSL_MSVC_PRAGMA(warning(pop))
#endif
#include <openssl/buf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "internal.h"
#include "../internal.h"
enum {
BIO_CONN_S_BEFORE,
BIO_CONN_S_BLOCKED_CONNECT,
BIO_CONN_S_OK,
};
typedef struct bio_connect_st {
int state;
char *param_hostname;
char *param_port;
int nbio;
unsigned short port;
struct sockaddr_storage them;
socklen_t them_length;
/* the file descriptor is kept in bio->num in order to match the socket
* BIO. */
/* info_callback is called when the connection is initially made
* callback(BIO,state,ret); The callback should return 'ret', state is for
* compatibility with the SSL info_callback. */
int (*info_callback)(const BIO *bio, int state, int ret);
} BIO_CONNECT;
#if !defined(OPENSSL_WINDOWS)
static int closesocket(int sock) {
return close(sock);
}
#endif
/* split_host_and_port sets |*out_host| and |*out_port| to the host and port
* parsed from |name|. It returns one on success or zero on error. Even when
* successful, |*out_port| may be NULL on return if no port was specified. */
static int split_host_and_port(char **out_host, char **out_port, const char *name) {
const char *host, *port = NULL;
size_t host_len = 0;
*out_host = NULL;
*out_port = NULL;
if (name[0] == '[') { /* bracketed IPv6 address */
const char *close = strchr(name, ']');
if (close == NULL) {
return 0;
}
host = name + 1;
host_len = close - host;
if (close[1] == ':') { /* [IP]:port */
port = close + 2;
} else if (close[1] != 0) {
return 0;
}
} else {
const char *colon = strchr(name, ':');
if (colon == NULL || strchr(colon + 1, ':') != NULL) { /* IPv6 address */
host = name;
host_len = strlen(name);
} else { /* host:port */
host = name;
host_len = colon - name;
port = colon + 1;
}
}
*out_host = BUF_strndup(host, host_len);
if (*out_host == NULL) {
return 0;
}
if (port == NULL) {
*out_port = NULL;
return 1;
}
*out_port = OPENSSL_strdup(port);
if (*out_port == NULL) {
OPENSSL_free(*out_host);
*out_host = NULL;
return 0;
}
return 1;
}
static int conn_state(BIO *bio, BIO_CONNECT *c) {
int ret = -1, i;
int (*cb)(const BIO *, int, int) = NULL;
if (c->info_callback != NULL) {
cb = c->info_callback;
}
for (;;) {
switch (c->state) {
case BIO_CONN_S_BEFORE:
/* If there's a hostname and a port, assume that both are
* exactly what they say. If there is only a hostname, try
* (just once) to split it into a hostname and port. */
if (c->param_hostname == NULL) {
OPENSSL_PUT_ERROR(BIO, BIO_R_NO_HOSTNAME_SPECIFIED);
goto exit_loop;
}
if (c->param_port == NULL) {
char *host, *port;
if (!split_host_and_port(&host, &port, c->param_hostname) ||
port == NULL) {
OPENSSL_free(host);
OPENSSL_free(port);
OPENSSL_PUT_ERROR(BIO, BIO_R_NO_PORT_SPECIFIED);
ERR_add_error_data(2, "host=", c->param_hostname);
goto exit_loop;
}
OPENSSL_free(c->param_port);
c->param_port = port;
OPENSSL_free(c->param_hostname);
c->param_hostname = host;
}
if (!bio_ip_and_port_to_socket_and_addr(
&bio->num, &c->them, &c->them_length, c->param_hostname,
c->param_port)) {
OPENSSL_PUT_ERROR(BIO, BIO_R_UNABLE_TO_CREATE_SOCKET);
ERR_add_error_data(4, "host=", c->param_hostname, ":", c->param_port);
goto exit_loop;
}
if (c->nbio) {
if (!bio_socket_nbio(bio->num, 1)) {
OPENSSL_PUT_ERROR(BIO, BIO_R_ERROR_SETTING_NBIO);
ERR_add_error_data(4, "host=", c->param_hostname, ":",
c->param_port);
goto exit_loop;
}
}
i = 1;
ret = setsockopt(bio->num, SOL_SOCKET, SO_KEEPALIVE, (char *)&i,
sizeof(i));
if (ret < 0) {
OPENSSL_PUT_SYSTEM_ERROR();
OPENSSL_PUT_ERROR(BIO, BIO_R_KEEPALIVE);
ERR_add_error_data(4, "host=", c->param_hostname, ":", c->param_port);
goto exit_loop;
}
BIO_clear_retry_flags(bio);
ret = connect(bio->num, (struct sockaddr*) &c->them, c->them_length);
if (ret < 0) {
if (bio_fd_should_retry(ret)) {
BIO_set_flags(bio, (BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY));
c->state = BIO_CONN_S_BLOCKED_CONNECT;
bio->retry_reason = BIO_RR_CONNECT;
} else {
OPENSSL_PUT_SYSTEM_ERROR();
OPENSSL_PUT_ERROR(BIO, BIO_R_CONNECT_ERROR);
ERR_add_error_data(4, "host=", c->param_hostname, ":",
c->param_port);
}
goto exit_loop;
} else {
c->state = BIO_CONN_S_OK;
}
break;
case BIO_CONN_S_BLOCKED_CONNECT:
i = bio_sock_error(bio->num);
if (i) {
if (bio_fd_should_retry(ret)) {
BIO_set_flags(bio, (BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY));
c->state = BIO_CONN_S_BLOCKED_CONNECT;
bio->retry_reason = BIO_RR_CONNECT;
ret = -1;
} else {
BIO_clear_retry_flags(bio);
OPENSSL_PUT_SYSTEM_ERROR();
OPENSSL_PUT_ERROR(BIO, BIO_R_NBIO_CONNECT_ERROR);
ERR_add_error_data(4, "host=", c->param_hostname, ":", c->param_port);
ret = 0;
}
goto exit_loop;
} else {
c->state = BIO_CONN_S_OK;
}
break;
case BIO_CONN_S_OK:
ret = 1;
goto exit_loop;
default:
assert(0);
goto exit_loop;
}
if (cb != NULL) {
ret = cb((BIO *)bio, c->state, ret);
if (ret == 0) {
goto end;
}
}
}
exit_loop:
if (cb != NULL) {
ret = cb((BIO *)bio, c->state, ret);
}
end:
return ret;
}
static BIO_CONNECT *BIO_CONNECT_new(void) {
BIO_CONNECT *ret = OPENSSL_malloc(sizeof(BIO_CONNECT));
if (ret == NULL) {
return NULL;
}
OPENSSL_memset(ret, 0, sizeof(BIO_CONNECT));
ret->state = BIO_CONN_S_BEFORE;
return ret;
}
static void BIO_CONNECT_free(BIO_CONNECT *c) {
if (c == NULL) {
return;
}
OPENSSL_free(c->param_hostname);
OPENSSL_free(c->param_port);
OPENSSL_free(c);
}
static int conn_new(BIO *bio) {
bio->init = 0;
bio->num = -1;
bio->flags = 0;
bio->ptr = (char *)BIO_CONNECT_new();
return bio->ptr != NULL;
}
static void conn_close_socket(BIO *bio) {
BIO_CONNECT *c = (BIO_CONNECT *) bio->ptr;
if (bio->num == -1) {
return;
}
/* Only do a shutdown if things were established */
if (c->state == BIO_CONN_S_OK) {
shutdown(bio->num, 2);
}
closesocket(bio->num);
bio->num = -1;
}
static int conn_free(BIO *bio) {
if (bio == NULL) {
return 0;
}
if (bio->shutdown) {
conn_close_socket(bio);
}
BIO_CONNECT_free((BIO_CONNECT*) bio->ptr);
return 1;
}
static int conn_read(BIO *bio, char *out, int out_len) {
int ret = 0;
BIO_CONNECT *data;
data = (BIO_CONNECT *)bio->ptr;
if (data->state != BIO_CONN_S_OK) {
ret = conn_state(bio, data);
if (ret <= 0) {
return ret;
}
}
bio_clear_socket_error();
ret = recv(bio->num, out, out_len, 0);
BIO_clear_retry_flags(bio);
if (ret <= 0) {
if (bio_fd_should_retry(ret)) {
BIO_set_retry_read(bio);
}
}
return ret;
}
static int conn_write(BIO *bio, const char *in, int in_len) {
int ret;
BIO_CONNECT *data;
data = (BIO_CONNECT *)bio->ptr;
if (data->state != BIO_CONN_S_OK) {
ret = conn_state(bio, data);
if (ret <= 0) {
return ret;
}
}
bio_clear_socket_error();
ret = send(bio->num, in, in_len, 0);
BIO_clear_retry_flags(bio);
if (ret <= 0) {
if (bio_fd_should_retry(ret)) {
BIO_set_retry_write(bio);
}
}
return ret;
}
static long conn_ctrl(BIO *bio, int cmd, long num, void *ptr) {
int *ip;
long ret = 1;
BIO_CONNECT *data;
data = (BIO_CONNECT *)bio->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
ret = 0;
data->state = BIO_CONN_S_BEFORE;
conn_close_socket(bio);
bio->flags = 0;
break;
case BIO_C_DO_STATE_MACHINE:
/* use this one to start the connection */
if (data->state != BIO_CONN_S_OK) {
ret = (long)conn_state(bio, data);
} else {
ret = 1;
}
break;
case BIO_C_SET_CONNECT:
if (ptr != NULL) {
bio->init = 1;
if (num == 0) {
OPENSSL_free(data->param_hostname);
data->param_hostname = BUF_strdup(ptr);
if (data->param_hostname == NULL) {
ret = 0;
}
} else if (num == 1) {
OPENSSL_free(data->param_port);
data->param_port = BUF_strdup(ptr);
if (data->param_port == NULL) {
ret = 0;
}
} else {
ret = 0;
}
}
break;
case BIO_C_SET_NBIO:
data->nbio = (int)num;
break;
case BIO_C_GET_FD:
if (bio->init) {
ip = (int *)ptr;
if (ip != NULL) {
*ip = bio->num;
}
ret = bio->num;
} else {
ret = -1;
}
break;
case BIO_CTRL_GET_CLOSE:
ret = bio->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
bio->shutdown = (int)num;
break;
case BIO_CTRL_PENDING:
case BIO_CTRL_WPENDING:
ret = 0;
break;
case BIO_CTRL_FLUSH:
break;
case BIO_CTRL_GET_CALLBACK: {
int (**fptr)(const BIO *bio, int state, int xret);
fptr = (int (**)(const BIO *bio, int state, int xret))ptr;
*fptr = data->info_callback;
} break;
default:
ret = 0;
break;
}
return ret;
}
static long conn_callback_ctrl(BIO *bio, int cmd, bio_info_cb fp) {
long ret = 1;
BIO_CONNECT *data;
data = (BIO_CONNECT *)bio->ptr;
switch (cmd) {
case BIO_CTRL_SET_CALLBACK:
data->info_callback = (int (*)(const struct bio_st *, int, int))fp;
break;
default:
ret = 0;
break;
}
return ret;
}
BIO *BIO_new_connect(const char *hostname) {
BIO *ret;
ret = BIO_new(BIO_s_connect());
if (ret == NULL) {
return NULL;
}
if (!BIO_set_conn_hostname(ret, hostname)) {
BIO_free(ret);
return NULL;
}
return ret;
}
static const BIO_METHOD methods_connectp = {
BIO_TYPE_CONNECT, "socket connect", conn_write, conn_read,
NULL /* puts */, NULL /* gets */, conn_ctrl, conn_new,
conn_free, conn_callback_ctrl,
};
const BIO_METHOD *BIO_s_connect(void) { return &methods_connectp; }
int BIO_set_conn_hostname(BIO *bio, const char *name) {
return BIO_ctrl(bio, BIO_C_SET_CONNECT, 0, (void*) name);
}
int BIO_set_conn_port(BIO *bio, const char *port_str) {
return BIO_ctrl(bio, BIO_C_SET_CONNECT, 1, (void*) port_str);
}
int BIO_set_conn_int_port(BIO *bio, const int *port) {
char buf[DECIMAL_SIZE(int) + 1];
BIO_snprintf(buf, sizeof(buf), "%d", *port);
return BIO_set_conn_port(bio, buf);
}
int BIO_set_nbio(BIO *bio, int on) {
return BIO_ctrl(bio, BIO_C_SET_NBIO, on, NULL);
}
int BIO_do_connect(BIO *bio) {
return BIO_ctrl(bio, BIO_C_DO_STATE_MACHINE, 0, NULL);
}