[8a9afe4] | 1 | /********************************************************************\ |
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| 2 | * BitlBee -- An IRC to other IM-networks gateway * |
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| 3 | * * |
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[03a8f8e] | 4 | * Copyright 2002-2011 Wilmer van der Gaast and others * |
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[8a9afe4] | 5 | \********************************************************************/ |
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| 6 | |
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[52b3a99] | 7 | /* HTTP(S) module */ |
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[8a9afe4] | 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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[52b3a99] | 27 | #include <stdio.h> |
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[8a9afe4] | 28 | |
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| 29 | #include "http_client.h" |
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[52b3a99] | 30 | #include "url.h" |
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[e4d6271] | 31 | #include "sock.h" |
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[8a9afe4] | 32 | |
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| 33 | |
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[ba9edaa] | 34 | static gboolean http_connected( gpointer data, int source, b_input_condition cond ); |
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| 35 | static gboolean http_ssl_connected( gpointer data, void *source, b_input_condition cond ); |
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| 36 | static gboolean http_incoming_data( gpointer data, int source, b_input_condition cond ); |
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[516a9c6] | 37 | static void http_free( struct http_request *req ); |
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[8a9afe4] | 38 | |
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| 39 | |
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[516a9c6] | 40 | struct http_request *http_dorequest( char *host, int port, int ssl, char *request, http_input_function func, gpointer data ) |
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[8a9afe4] | 41 | { |
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| 42 | struct http_request *req; |
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| 43 | int error = 0; |
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| 44 | |
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| 45 | req = g_new0( struct http_request, 1 ); |
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| 46 | |
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| 47 | if( ssl ) |
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| 48 | { |
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| 49 | req->ssl = ssl_connect( host, port, http_ssl_connected, req ); |
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| 50 | if( req->ssl == NULL ) |
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| 51 | error = 1; |
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| 52 | } |
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| 53 | else |
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| 54 | { |
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| 55 | req->fd = proxy_connect( host, port, http_connected, req ); |
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| 56 | if( req->fd < 0 ) |
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| 57 | error = 1; |
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| 58 | } |
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| 59 | |
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| 60 | if( error ) |
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| 61 | { |
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[fb98634] | 62 | http_free( req ); |
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| 63 | return NULL; |
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[8a9afe4] | 64 | } |
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| 65 | |
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[52b3a99] | 66 | req->func = func; |
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| 67 | req->data = data; |
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[8a9afe4] | 68 | req->request = g_strdup( request ); |
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| 69 | req->request_length = strlen( request ); |
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[7885d0f] | 70 | req->redir_ttl = 3; |
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[8a9afe4] | 71 | |
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| 72 | return( req ); |
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| 73 | } |
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| 74 | |
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[516a9c6] | 75 | struct http_request *http_dorequest_url( char *url_string, http_input_function func, gpointer data ) |
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[0790644] | 76 | { |
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| 77 | url_t *url = g_new0( url_t, 1 ); |
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| 78 | char *request; |
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| 79 | void *ret; |
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| 80 | |
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| 81 | if( !url_set( url, url_string ) ) |
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| 82 | { |
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| 83 | g_free( url ); |
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| 84 | return NULL; |
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| 85 | } |
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| 86 | |
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| 87 | if( url->proto != PROTO_HTTP && url->proto != PROTO_HTTPS ) |
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| 88 | { |
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| 89 | g_free( url ); |
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| 90 | return NULL; |
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| 91 | } |
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| 92 | |
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| 93 | request = g_strdup_printf( "GET %s HTTP/1.0\r\n" |
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| 94 | "Host: %s\r\n" |
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[2423c93] | 95 | "Connection: close\r\n" |
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[1b5ab36] | 96 | "User-Agent: BitlBee " BITLBEE_VERSION " " ARCH "/" CPU "\r\n" |
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[0790644] | 97 | "\r\n", url->file, url->host ); |
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| 98 | |
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| 99 | ret = http_dorequest( url->host, url->port, |
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| 100 | url->proto == PROTO_HTTPS, request, func, data ); |
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| 101 | |
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| 102 | g_free( url ); |
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| 103 | g_free( request ); |
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[266fe2f] | 104 | return ret; |
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[0790644] | 105 | } |
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| 106 | |
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[8a9afe4] | 107 | /* This one is actually pretty simple... Might get more calls if we can't write |
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| 108 | the whole request at once. */ |
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[ba9edaa] | 109 | static gboolean http_connected( gpointer data, int source, b_input_condition cond ) |
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[8a9afe4] | 110 | { |
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| 111 | struct http_request *req = data; |
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| 112 | int st; |
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| 113 | |
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| 114 | if( source < 0 ) |
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| 115 | goto error; |
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| 116 | |
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| 117 | if( req->inpa > 0 ) |
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[ba9edaa] | 118 | b_event_remove( req->inpa ); |
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[8a9afe4] | 119 | |
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| 120 | sock_make_nonblocking( req->fd ); |
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| 121 | |
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| 122 | if( req->ssl ) |
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| 123 | { |
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| 124 | st = ssl_write( req->ssl, req->request + req->bytes_written, |
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| 125 | req->request_length - req->bytes_written ); |
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| 126 | if( st < 0 ) |
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| 127 | { |
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| 128 | if( ssl_errno != SSL_AGAIN ) |
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| 129 | { |
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| 130 | ssl_disconnect( req->ssl ); |
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| 131 | goto error; |
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| 132 | } |
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| 133 | } |
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| 134 | } |
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| 135 | else |
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| 136 | { |
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| 137 | st = write( source, req->request + req->bytes_written, |
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| 138 | req->request_length - req->bytes_written ); |
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| 139 | if( st < 0 ) |
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| 140 | { |
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| 141 | if( !sockerr_again() ) |
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| 142 | { |
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[52b3a99] | 143 | closesocket( req->fd ); |
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[8a9afe4] | 144 | goto error; |
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| 145 | } |
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| 146 | } |
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| 147 | } |
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| 148 | |
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| 149 | if( st > 0 ) |
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| 150 | req->bytes_written += st; |
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| 151 | |
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| 152 | if( req->bytes_written < req->request_length ) |
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[ba9edaa] | 153 | req->inpa = b_input_add( source, |
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[e046390] | 154 | req->ssl ? ssl_getdirection( req->ssl ) : B_EV_IO_WRITE, |
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[ba9edaa] | 155 | http_connected, req ); |
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[8a9afe4] | 156 | else |
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[e046390] | 157 | req->inpa = b_input_add( source, B_EV_IO_READ, http_incoming_data, req ); |
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[8a9afe4] | 158 | |
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[ba9edaa] | 159 | return FALSE; |
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[8a9afe4] | 160 | |
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| 161 | error: |
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[7deb447] | 162 | req->status_string = g_strdup( "Error while writing HTTP request" ); |
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| 163 | |
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[8a9afe4] | 164 | req->func( req ); |
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[fb98634] | 165 | http_free( req ); |
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[ba9edaa] | 166 | return FALSE; |
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[8a9afe4] | 167 | } |
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| 168 | |
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[ba9edaa] | 169 | static gboolean http_ssl_connected( gpointer data, void *source, b_input_condition cond ) |
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[8a9afe4] | 170 | { |
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| 171 | struct http_request *req = data; |
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| 172 | |
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| 173 | if( source == NULL ) |
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| 174 | return http_connected( data, -1, cond ); |
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| 175 | |
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| 176 | req->fd = ssl_getfd( source ); |
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| 177 | |
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| 178 | return http_connected( data, req->fd, cond ); |
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| 179 | } |
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| 180 | |
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[ba9edaa] | 181 | static gboolean http_incoming_data( gpointer data, int source, b_input_condition cond ) |
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[8a9afe4] | 182 | { |
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| 183 | struct http_request *req = data; |
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| 184 | int evil_server = 0; |
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| 185 | char buffer[2048]; |
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| 186 | char *end1, *end2; |
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| 187 | int st; |
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| 188 | |
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| 189 | if( req->inpa > 0 ) |
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[ba9edaa] | 190 | b_event_remove( req->inpa ); |
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[8a9afe4] | 191 | |
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| 192 | if( req->ssl ) |
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| 193 | { |
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| 194 | st = ssl_read( req->ssl, buffer, sizeof( buffer ) ); |
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| 195 | if( st < 0 ) |
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| 196 | { |
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| 197 | if( ssl_errno != SSL_AGAIN ) |
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| 198 | { |
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[ad8b8a3] | 199 | /* goto cleanup; */ |
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| 200 | |
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| 201 | /* YAY! We have to deal with crappy Microsoft |
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| 202 | servers that LOVE to send invalid TLS |
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| 203 | packets that abort connections! \o/ */ |
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| 204 | |
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| 205 | goto got_reply; |
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[8a9afe4] | 206 | } |
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| 207 | } |
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| 208 | else if( st == 0 ) |
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| 209 | { |
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| 210 | goto got_reply; |
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| 211 | } |
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| 212 | } |
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| 213 | else |
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| 214 | { |
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| 215 | st = read( req->fd, buffer, sizeof( buffer ) ); |
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| 216 | if( st < 0 ) |
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| 217 | { |
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| 218 | if( !sockerr_again() ) |
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| 219 | { |
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[7deb447] | 220 | req->status_string = g_strdup( strerror( errno ) ); |
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[8a9afe4] | 221 | goto cleanup; |
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| 222 | } |
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| 223 | } |
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| 224 | else if( st == 0 ) |
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| 225 | { |
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| 226 | goto got_reply; |
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| 227 | } |
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| 228 | } |
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| 229 | |
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| 230 | if( st > 0 ) |
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| 231 | { |
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| 232 | req->reply_headers = g_realloc( req->reply_headers, req->bytes_read + st + 1 ); |
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| 233 | memcpy( req->reply_headers + req->bytes_read, buffer, st ); |
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[52b3a99] | 234 | req->bytes_read += st; |
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[8a9afe4] | 235 | } |
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| 236 | |
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| 237 | /* There will be more! */ |
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[ba9edaa] | 238 | req->inpa = b_input_add( req->fd, |
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[e046390] | 239 | req->ssl ? ssl_getdirection( req->ssl ) : B_EV_IO_READ, |
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[ba9edaa] | 240 | http_incoming_data, req ); |
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[8a9afe4] | 241 | |
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[80acb6d] | 242 | if( ssl_pending( req->ssl ) ) |
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| 243 | return http_incoming_data( data, source, cond ); |
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| 244 | else |
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| 245 | return FALSE; |
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[8a9afe4] | 246 | |
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| 247 | got_reply: |
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[0602496] | 248 | /* Maybe if the webserver is overloaded, or when there's bad SSL |
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| 249 | support... */ |
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| 250 | if( req->bytes_read == 0 ) |
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[7deb447] | 251 | { |
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| 252 | req->status_string = g_strdup( "Empty HTTP reply" ); |
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[0602496] | 253 | goto cleanup; |
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[7deb447] | 254 | } |
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[0602496] | 255 | |
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[8a9afe4] | 256 | /* Zero termination is very convenient. */ |
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| 257 | req->reply_headers[req->bytes_read] = 0; |
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| 258 | |
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| 259 | /* Find the separation between headers and body, and keep stupid |
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| 260 | webservers in mind. */ |
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| 261 | end1 = strstr( req->reply_headers, "\r\n\r\n" ); |
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| 262 | end2 = strstr( req->reply_headers, "\n\n" ); |
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| 263 | |
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| 264 | if( end2 && end2 < end1 ) |
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| 265 | { |
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[52b3a99] | 266 | end1 = end2 + 1; |
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[8a9afe4] | 267 | evil_server = 1; |
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| 268 | } |
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[0eec386] | 269 | else if( end1 ) |
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[52b3a99] | 270 | { |
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| 271 | end1 += 2; |
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| 272 | } |
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[0eec386] | 273 | else |
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[8a9afe4] | 274 | { |
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[7deb447] | 275 | req->status_string = g_strdup( "Malformed HTTP reply" ); |
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[0eec386] | 276 | goto cleanup; |
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[52b3a99] | 277 | } |
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| 278 | |
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[0eec386] | 279 | *end1 = 0; |
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| 280 | |
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[bd31661] | 281 | if( getenv( "BITLBEE_DEBUG" ) ) |
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| 282 | printf( "HTTP response headers:\n%s", req->reply_headers ); |
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| 283 | |
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[0eec386] | 284 | if( evil_server ) |
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| 285 | req->reply_body = end1 + 1; |
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| 286 | else |
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| 287 | req->reply_body = end1 + 2; |
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| 288 | |
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[41e5202] | 289 | req->body_size = req->reply_headers + req->bytes_read - req->reply_body; |
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[0eec386] | 290 | |
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[52b3a99] | 291 | if( ( end1 = strchr( req->reply_headers, ' ' ) ) != NULL ) |
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| 292 | { |
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| 293 | if( sscanf( end1 + 1, "%d", &req->status_code ) != 1 ) |
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[7deb447] | 294 | { |
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| 295 | req->status_string = g_strdup( "Can't parse status code" ); |
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[52b3a99] | 296 | req->status_code = -1; |
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[7deb447] | 297 | } |
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| 298 | else |
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| 299 | { |
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| 300 | char *eol; |
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| 301 | |
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| 302 | if( evil_server ) |
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| 303 | eol = strchr( end1, '\n' ); |
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| 304 | else |
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| 305 | eol = strchr( end1, '\r' ); |
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| 306 | |
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| 307 | req->status_string = g_strndup( end1 + 1, eol - end1 - 1 ); |
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| 308 | |
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| 309 | /* Just to be sure... */ |
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| 310 | if( ( eol = strchr( req->status_string, '\r' ) ) ) |
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| 311 | *eol = 0; |
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| 312 | if( ( eol = strchr( req->status_string, '\n' ) ) ) |
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| 313 | *eol = 0; |
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| 314 | } |
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[52b3a99] | 315 | } |
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| 316 | else |
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| 317 | { |
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[7deb447] | 318 | req->status_string = g_strdup( "Can't locate status code" ); |
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[52b3a99] | 319 | req->status_code = -1; |
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| 320 | } |
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| 321 | |
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[dff732d] | 322 | if( ( req->status_code >= 301 && req->status_code <= 303 ) && req->redir_ttl-- > 0 ) |
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[52b3a99] | 323 | { |
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| 324 | char *loc, *new_request, *new_host; |
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| 325 | int error = 0, new_port, new_proto; |
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| 326 | |
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[7deb447] | 327 | /* We might fill it again, so let's not leak any memory. */ |
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| 328 | g_free( req->status_string ); |
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| 329 | req->status_string = NULL; |
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| 330 | |
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[52b3a99] | 331 | loc = strstr( req->reply_headers, "\nLocation: " ); |
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| 332 | if( loc == NULL ) /* We can't handle this redirect... */ |
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[7deb447] | 333 | { |
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| 334 | req->status_string = g_strdup( "Can't locate Location: header" ); |
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[52b3a99] | 335 | goto cleanup; |
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[7deb447] | 336 | } |
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[52b3a99] | 337 | |
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| 338 | loc += 11; |
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| 339 | while( *loc == ' ' ) |
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| 340 | loc ++; |
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| 341 | |
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| 342 | /* TODO/FIXME: Possibly have to handle relative redirections, |
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| 343 | and rewrite Host: headers. Not necessary for now, it's |
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| 344 | enough for passport authentication like this. */ |
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| 345 | |
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| 346 | if( *loc == '/' ) |
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| 347 | { |
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| 348 | /* Just a different pathname... */ |
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| 349 | |
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| 350 | /* Since we don't cache the servername, and since we |
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| 351 | don't need this yet anyway, I won't implement it. */ |
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| 352 | |
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[7deb447] | 353 | req->status_string = g_strdup( "Can't handle recursive redirects" ); |
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| 354 | |
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[52b3a99] | 355 | goto cleanup; |
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| 356 | } |
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[8a9afe4] | 357 | else |
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[52b3a99] | 358 | { |
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| 359 | /* A whole URL */ |
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| 360 | url_t *url; |
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| 361 | char *s; |
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[03a8f8e] | 362 | const char *new_method; |
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[52b3a99] | 363 | |
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| 364 | s = strstr( loc, "\r\n" ); |
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| 365 | if( s == NULL ) |
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| 366 | goto cleanup; |
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| 367 | |
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| 368 | url = g_new0( url_t, 1 ); |
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| 369 | *s = 0; |
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| 370 | |
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| 371 | if( !url_set( url, loc ) ) |
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| 372 | { |
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[7deb447] | 373 | req->status_string = g_strdup( "Malformed redirect URL" ); |
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[52b3a99] | 374 | g_free( url ); |
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| 375 | goto cleanup; |
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| 376 | } |
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| 377 | |
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[03a8f8e] | 378 | /* Find all headers and, if necessary, the POST request contents. |
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| 379 | Skip the old Host: header though. This crappy code here means |
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| 380 | anything using this http_client MUST put the Host: header at |
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| 381 | the top. */ |
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[dff732d] | 382 | if( !( ( s = strstr( req->request, "\r\nHost: " ) ) && |
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| 383 | ( s = strstr( s + strlen( "\r\nHost: " ), "\r\n" ) ) ) ) |
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[52b3a99] | 384 | { |
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[7deb447] | 385 | req->status_string = g_strdup( "Error while rebuilding request string" ); |
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[52b3a99] | 386 | g_free( url ); |
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| 387 | goto cleanup; |
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| 388 | } |
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| 389 | |
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[03a8f8e] | 390 | /* More or less HTTP/1.0 compliant, from my reading of RFC 2616. |
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| 391 | Always perform a GET request unless we received a 301. 303 was |
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| 392 | meant for this but it's HTTP/1.1-only and we're specifically |
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| 393 | speaking HTTP/1.0. */ |
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| 394 | new_method = req->status_code != 301 || req->request[0] == 'G' ? "GET" : "POST"; |
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| 395 | |
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| 396 | /* Okay, this isn't fun! We have to rebuild the request... :-( */ |
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| 397 | new_request = g_strdup_printf( "%s %s HTTP/1.0\r\nHost: %s%s", |
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| 398 | new_method, url->file, url->host, s ); |
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| 399 | |
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[52b3a99] | 400 | new_host = g_strdup( url->host ); |
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| 401 | new_port = url->port; |
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| 402 | new_proto = url->proto; |
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| 403 | |
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[03a8f8e] | 404 | /* If we went from POST to GET, truncate the request content. */ |
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| 405 | if( new_request[0] != req->request[0] && new_request[0] == 'G' && |
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| 406 | ( s = strstr( new_request, "\r\n\r\n" ) ) ) |
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| 407 | s[4] = '\0'; |
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| 408 | |
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[52b3a99] | 409 | g_free( url ); |
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| 410 | } |
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| 411 | |
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| 412 | if( req->ssl ) |
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| 413 | ssl_disconnect( req->ssl ); |
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| 414 | else |
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| 415 | closesocket( req->fd ); |
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| 416 | |
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| 417 | req->fd = -1; |
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[7deb447] | 418 | req->ssl = NULL; |
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[52b3a99] | 419 | |
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[bd31661] | 420 | if( getenv( "BITLBEE_DEBUG" ) ) |
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| 421 | printf( "New headers for redirected HTTP request:\n%s", new_request ); |
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| 422 | |
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[52b3a99] | 423 | if( new_proto == PROTO_HTTPS ) |
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| 424 | { |
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| 425 | req->ssl = ssl_connect( new_host, new_port, http_ssl_connected, req ); |
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| 426 | if( req->ssl == NULL ) |
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| 427 | error = 1; |
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| 428 | } |
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| 429 | else |
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| 430 | { |
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| 431 | req->fd = proxy_connect( new_host, new_port, http_connected, req ); |
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| 432 | if( req->fd < 0 ) |
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| 433 | error = 1; |
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| 434 | } |
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[2db811a] | 435 | g_free( new_host ); |
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[52b3a99] | 436 | |
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| 437 | if( error ) |
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| 438 | { |
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[7deb447] | 439 | req->status_string = g_strdup( "Connection problem during redirect" ); |
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[52b3a99] | 440 | g_free( new_request ); |
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| 441 | goto cleanup; |
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| 442 | } |
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| 443 | |
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| 444 | g_free( req->request ); |
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| 445 | g_free( req->reply_headers ); |
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| 446 | req->request = new_request; |
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| 447 | req->request_length = strlen( new_request ); |
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| 448 | req->bytes_read = req->bytes_written = req->inpa = 0; |
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| 449 | req->reply_headers = req->reply_body = NULL; |
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| 450 | |
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[ba9edaa] | 451 | return FALSE; |
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[8a9afe4] | 452 | } |
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| 453 | |
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| 454 | /* Assume that a closed connection means we're finished, this indeed |
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| 455 | breaks with keep-alive connections and faulty connections. */ |
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| 456 | req->finished = 1; |
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| 457 | |
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| 458 | cleanup: |
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| 459 | if( req->ssl ) |
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| 460 | ssl_disconnect( req->ssl ); |
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| 461 | else |
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[52b3a99] | 462 | closesocket( req->fd ); |
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[8a9afe4] | 463 | |
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[bd31661] | 464 | if( getenv( "BITLBEE_DEBUG" ) && req ) |
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| 465 | printf( "Finishing HTTP request with status: %s", |
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| 466 | req->status_string ? req->status_string : "NULL" ); |
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| 467 | |
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[8a9afe4] | 468 | req->func( req ); |
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[fb98634] | 469 | http_free( req ); |
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| 470 | return FALSE; |
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| 471 | } |
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| 472 | |
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[516a9c6] | 473 | static void http_free( struct http_request *req ) |
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[fb98634] | 474 | { |
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[8a9afe4] | 475 | g_free( req->request ); |
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| 476 | g_free( req->reply_headers ); |
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[7deb447] | 477 | g_free( req->status_string ); |
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[8a9afe4] | 478 | g_free( req ); |
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| 479 | } |
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[fb98634] | 480 | |
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