1 | /********************************************************************\ |
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2 | * BitlBee -- An IRC to other IM-networks gateway * |
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3 | * * |
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4 | * Copyright 2002-2005 Wilmer van der Gaast and others * |
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5 | \********************************************************************/ |
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6 | |
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7 | /* HTTP(S) module */ |
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8 | |
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9 | /* |
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10 | This program is free software; you can redistribute it and/or modify |
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11 | it under the terms of the GNU General Public License as published by |
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12 | the Free Software Foundation; either version 2 of the License, or |
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13 | (at your option) any later version. |
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14 | |
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15 | This program is distributed in the hope that it will be useful, |
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16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 | GNU General Public License for more details. |
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19 | |
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20 | You should have received a copy of the GNU General Public License with |
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21 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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22 | if not, write to the Free Software Foundation, Inc., 59 Temple Place, |
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23 | Suite 330, Boston, MA 02111-1307 USA |
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24 | */ |
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25 | |
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26 | #include <string.h> |
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27 | #include <stdio.h> |
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28 | |
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29 | #include "http_client.h" |
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30 | #include "url.h" |
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31 | #include "sock.h" |
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32 | |
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33 | |
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34 | static void http_connected( gpointer data, int source, GaimInputCondition cond ); |
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35 | static void http_ssl_connected( gpointer data, void *source, GaimInputCondition cond ); |
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36 | static void http_incoming_data( gpointer data, int source, GaimInputCondition cond ); |
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37 | |
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38 | |
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39 | void *http_dorequest( char *host, int port, int ssl, char *request, http_input_function func, gpointer data ) |
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40 | { |
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41 | struct http_request *req; |
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42 | int error = 0; |
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43 | |
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44 | req = g_new0( struct http_request, 1 ); |
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45 | |
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46 | if( ssl ) |
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47 | { |
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48 | req->ssl = ssl_connect( host, port, http_ssl_connected, req ); |
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49 | if( req->ssl == NULL ) |
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50 | error = 1; |
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51 | } |
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52 | else |
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53 | { |
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54 | req->fd = proxy_connect( host, port, http_connected, req ); |
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55 | if( req->fd < 0 ) |
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56 | error = 1; |
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57 | } |
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58 | |
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59 | if( error ) |
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60 | { |
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61 | g_free( req ); |
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62 | return( NULL ); |
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63 | } |
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64 | |
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65 | req->func = func; |
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66 | req->data = data; |
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67 | req->request = g_strdup( request ); |
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68 | req->request_length = strlen( request ); |
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69 | |
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70 | return( req ); |
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71 | } |
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72 | |
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73 | void *http_dorequest_url( char *url_string, http_input_function func, gpointer data ) |
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74 | { |
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75 | url_t *url = g_new0( url_t, 1 ); |
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76 | char *request; |
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77 | void *ret; |
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78 | |
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79 | if( !url_set( url, url_string ) ) |
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80 | { |
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81 | g_free( url ); |
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82 | return NULL; |
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83 | } |
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84 | |
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85 | if( url->proto != PROTO_HTTP && url->proto != PROTO_HTTPS ) |
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86 | { |
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87 | g_free( url ); |
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88 | return NULL; |
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89 | } |
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90 | |
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91 | request = g_strdup_printf( "GET %s HTTP/1.0\r\n" |
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92 | "Host: %s\r\n" |
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93 | "User-Agent: BitlBee " BITLBEE_VERSION "\r\n" |
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94 | "\r\n", url->file, url->host ); |
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95 | |
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96 | ret = http_dorequest( url->host, url->port, |
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97 | url->proto == PROTO_HTTPS, request, func, data ); |
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98 | |
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99 | g_free( url ); |
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100 | g_free( request ); |
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101 | return NULL; |
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102 | } |
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103 | |
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104 | /* This one is actually pretty simple... Might get more calls if we can't write |
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105 | the whole request at once. */ |
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106 | static void http_connected( gpointer data, int source, GaimInputCondition cond ) |
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107 | { |
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108 | struct http_request *req = data; |
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109 | int st; |
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110 | |
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111 | if( source < 0 ) |
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112 | goto error; |
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113 | |
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114 | if( req->inpa > 0 ) |
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115 | gaim_input_remove( req->inpa ); |
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116 | |
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117 | sock_make_nonblocking( req->fd ); |
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118 | |
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119 | if( req->ssl ) |
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120 | { |
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121 | st = ssl_write( req->ssl, req->request + req->bytes_written, |
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122 | req->request_length - req->bytes_written ); |
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123 | if( st < 0 ) |
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124 | { |
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125 | if( ssl_errno != SSL_AGAIN ) |
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126 | { |
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127 | ssl_disconnect( req->ssl ); |
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128 | goto error; |
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129 | } |
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130 | } |
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131 | } |
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132 | else |
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133 | { |
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134 | st = write( source, req->request + req->bytes_written, |
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135 | req->request_length - req->bytes_written ); |
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136 | if( st < 0 ) |
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137 | { |
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138 | if( !sockerr_again() ) |
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139 | { |
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140 | closesocket( req->fd ); |
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141 | goto error; |
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142 | } |
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143 | } |
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144 | } |
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145 | |
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146 | if( st > 0 ) |
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147 | req->bytes_written += st; |
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148 | |
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149 | if( req->bytes_written < req->request_length ) |
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150 | req->inpa = gaim_input_add( source, |
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151 | req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_WRITE, |
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152 | http_connected, req ); |
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153 | else |
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154 | req->inpa = gaim_input_add( source, GAIM_INPUT_READ, http_incoming_data, req ); |
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155 | |
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156 | return; |
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157 | |
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158 | error: |
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159 | req->func( req ); |
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160 | |
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161 | g_free( req->request ); |
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162 | g_free( req ); |
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163 | |
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164 | return; |
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165 | } |
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166 | |
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167 | static void http_ssl_connected( gpointer data, void *source, GaimInputCondition cond ) |
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168 | { |
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169 | struct http_request *req = data; |
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170 | |
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171 | if( source == NULL ) |
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172 | return http_connected( data, -1, cond ); |
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173 | |
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174 | req->fd = ssl_getfd( source ); |
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175 | |
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176 | return http_connected( data, req->fd, cond ); |
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177 | } |
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178 | |
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179 | static void http_incoming_data( gpointer data, int source, GaimInputCondition cond ) |
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180 | { |
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181 | struct http_request *req = data; |
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182 | int evil_server = 0; |
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183 | char buffer[2048]; |
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184 | char *end1, *end2; |
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185 | int st; |
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186 | |
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187 | if( req->inpa > 0 ) |
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188 | gaim_input_remove( req->inpa ); |
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189 | |
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190 | if( req->ssl ) |
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191 | { |
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192 | st = ssl_read( req->ssl, buffer, sizeof( buffer ) ); |
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193 | if( st < 0 ) |
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194 | { |
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195 | if( ssl_errno != SSL_AGAIN ) |
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196 | { |
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197 | /* goto cleanup; */ |
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198 | |
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199 | /* YAY! We have to deal with crappy Microsoft |
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200 | servers that LOVE to send invalid TLS |
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201 | packets that abort connections! \o/ */ |
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202 | |
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203 | goto got_reply; |
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204 | } |
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205 | } |
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206 | else if( st == 0 ) |
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207 | { |
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208 | goto got_reply; |
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209 | } |
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210 | } |
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211 | else |
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212 | { |
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213 | st = read( req->fd, buffer, sizeof( buffer ) ); |
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214 | if( st < 0 ) |
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215 | { |
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216 | if( !sockerr_again() ) |
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217 | { |
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218 | goto cleanup; |
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219 | } |
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220 | } |
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221 | else if( st == 0 ) |
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222 | { |
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223 | goto got_reply; |
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224 | } |
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225 | } |
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226 | |
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227 | if( st > 0 ) |
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228 | { |
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229 | req->reply_headers = g_realloc( req->reply_headers, req->bytes_read + st + 1 ); |
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230 | memcpy( req->reply_headers + req->bytes_read, buffer, st ); |
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231 | req->bytes_read += st; |
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232 | } |
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233 | |
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234 | /* There will be more! */ |
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235 | req->inpa = gaim_input_add( req->fd, |
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236 | req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_READ, |
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237 | http_incoming_data, req ); |
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238 | |
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239 | return; |
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240 | |
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241 | got_reply: |
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242 | /* Zero termination is very convenient. */ |
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243 | req->reply_headers[req->bytes_read] = 0; |
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244 | |
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245 | /* Find the separation between headers and body, and keep stupid |
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246 | webservers in mind. */ |
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247 | end1 = strstr( req->reply_headers, "\r\n\r\n" ); |
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248 | end2 = strstr( req->reply_headers, "\n\n" ); |
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249 | |
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250 | if( end2 && end2 < end1 ) |
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251 | { |
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252 | end1 = end2 + 1; |
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253 | evil_server = 1; |
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254 | } |
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255 | else |
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256 | { |
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257 | end1 += 2; |
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258 | } |
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259 | |
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260 | if( end1 ) |
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261 | { |
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262 | *end1 = 0; |
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263 | |
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264 | if( evil_server ) |
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265 | req->reply_body = end1 + 1; |
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266 | else |
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267 | req->reply_body = end1 + 2; |
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268 | } |
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269 | |
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270 | if( ( end1 = strchr( req->reply_headers, ' ' ) ) != NULL ) |
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271 | { |
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272 | if( sscanf( end1 + 1, "%d", &req->status_code ) != 1 ) |
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273 | req->status_code = -1; |
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274 | } |
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275 | else |
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276 | { |
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277 | req->status_code = -1; |
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278 | } |
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279 | |
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280 | if( req->status_code == 301 || req->status_code == 302 ) |
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281 | { |
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282 | char *loc, *new_request, *new_host; |
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283 | int error = 0, new_port, new_proto; |
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284 | |
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285 | loc = strstr( req->reply_headers, "\nLocation: " ); |
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286 | if( loc == NULL ) /* We can't handle this redirect... */ |
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287 | goto cleanup; |
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288 | |
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289 | loc += 11; |
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290 | while( *loc == ' ' ) |
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291 | loc ++; |
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292 | |
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293 | /* TODO/FIXME: Possibly have to handle relative redirections, |
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294 | and rewrite Host: headers. Not necessary for now, it's |
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295 | enough for passport authentication like this. */ |
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296 | |
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297 | if( *loc == '/' ) |
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298 | { |
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299 | /* Just a different pathname... */ |
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300 | |
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301 | /* Since we don't cache the servername, and since we |
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302 | don't need this yet anyway, I won't implement it. */ |
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303 | |
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304 | goto cleanup; |
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305 | } |
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306 | else |
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307 | { |
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308 | /* A whole URL */ |
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309 | url_t *url; |
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310 | char *s; |
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311 | |
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312 | s = strstr( loc, "\r\n" ); |
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313 | if( s == NULL ) |
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314 | goto cleanup; |
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315 | |
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316 | url = g_new0( url_t, 1 ); |
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317 | *s = 0; |
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318 | |
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319 | if( !url_set( url, loc ) ) |
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320 | { |
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321 | g_free( url ); |
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322 | goto cleanup; |
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323 | } |
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324 | |
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325 | /* Okay, this isn't fun! We have to rebuild the request... :-( */ |
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326 | new_request = g_malloc( req->request_length + strlen( url->file ) ); |
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327 | |
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328 | /* So, now I just allocated enough memory, so I'm |
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329 | going to use strcat(), whether you like it or not. :-) */ |
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330 | |
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331 | /* First, find the GET/POST/whatever from the original request. */ |
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332 | s = strchr( req->request, ' ' ); |
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333 | if( s == NULL ) |
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334 | { |
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335 | g_free( new_request ); |
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336 | g_free( url ); |
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337 | goto cleanup; |
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338 | } |
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339 | |
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340 | *s = 0; |
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341 | sprintf( new_request, "%s %s HTTP/1.0\r\n", req->request, url->file ); |
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342 | *s = ' '; |
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343 | |
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344 | s = strstr( req->request, "\r\n" ); |
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345 | if( s == NULL ) |
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346 | { |
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347 | g_free( new_request ); |
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348 | g_free( url ); |
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349 | goto cleanup; |
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350 | } |
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351 | |
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352 | strcat( new_request, s + 2 ); |
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353 | new_host = g_strdup( url->host ); |
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354 | new_port = url->port; |
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355 | new_proto = url->proto; |
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356 | |
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357 | g_free( url ); |
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358 | } |
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359 | |
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360 | if( req->ssl ) |
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361 | ssl_disconnect( req->ssl ); |
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362 | else |
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363 | closesocket( req->fd ); |
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364 | |
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365 | req->fd = -1; |
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366 | req->ssl = 0; |
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367 | |
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368 | if( new_proto == PROTO_HTTPS ) |
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369 | { |
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370 | req->ssl = ssl_connect( new_host, new_port, http_ssl_connected, req ); |
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371 | if( req->ssl == NULL ) |
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372 | error = 1; |
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373 | } |
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374 | else |
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375 | { |
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376 | req->fd = proxy_connect( new_host, new_port, http_connected, req ); |
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377 | if( req->fd < 0 ) |
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378 | error = 1; |
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379 | } |
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380 | g_free( new_host ); |
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381 | |
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382 | if( error ) |
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383 | { |
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384 | g_free( new_request ); |
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385 | goto cleanup; |
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386 | } |
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387 | |
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388 | g_free( req->request ); |
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389 | g_free( req->reply_headers ); |
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390 | req->request = new_request; |
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391 | req->request_length = strlen( new_request ); |
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392 | req->bytes_read = req->bytes_written = req->inpa = 0; |
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393 | req->reply_headers = req->reply_body = NULL; |
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394 | |
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395 | return; |
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396 | } |
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397 | |
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398 | /* Assume that a closed connection means we're finished, this indeed |
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399 | breaks with keep-alive connections and faulty connections. */ |
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400 | req->finished = 1; |
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401 | |
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402 | cleanup: |
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403 | if( req->ssl ) |
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404 | ssl_disconnect( req->ssl ); |
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405 | else |
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406 | closesocket( req->fd ); |
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407 | |
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408 | req->func( req ); |
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409 | |
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410 | g_free( req->request ); |
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411 | g_free( req->reply_headers ); |
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412 | g_free( req ); |
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413 | } |
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