1 | /***************************************************************************\ |
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2 | * * |
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3 | * BitlBee - An IRC to IM gateway * |
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4 | * Jabber module - I/O stuff (plain, SSL), queues, etc * |
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5 | * * |
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6 | * Copyright 2006 Wilmer van der Gaast <wilmer@gaast.net> * |
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7 | * * |
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8 | * This program is free software; you can redistribute it and/or modify * |
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9 | * it under the terms of the GNU General Public License as published by * |
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10 | * the Free Software Foundation; either version 2 of the License, or * |
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11 | * (at your option) any later version. * |
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12 | * * |
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13 | * This program is distributed in the hope that it will be useful, * |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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16 | * GNU General Public License for more details. * |
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17 | * * |
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18 | * You should have received a copy of the GNU General Public License along * |
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19 | * with this program; if not, write to the Free Software Foundation, Inc., * |
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20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * |
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21 | * * |
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22 | \***************************************************************************/ |
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23 | |
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24 | #include "jabber.h" |
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25 | |
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26 | static gboolean jabber_write_callback( gpointer data, gint fd, b_input_condition cond ); |
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27 | |
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28 | int jabber_write_packet( struct gaim_connection *gc, struct xt_node *node ) |
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29 | { |
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30 | char *buf; |
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31 | int st; |
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32 | |
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33 | buf = xt_to_string( node ); |
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34 | st = jabber_write( gc, buf, strlen( buf ) ); |
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35 | g_free( buf ); |
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36 | |
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37 | return st; |
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38 | } |
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39 | |
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40 | int jabber_write( struct gaim_connection *gc, char *buf, int len ) |
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41 | { |
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42 | struct jabber_data *jd = gc->proto_data; |
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43 | |
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44 | if( jd->tx_len == 0 ) |
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45 | { |
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46 | /* If the queue is empty, allocate a new buffer. */ |
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47 | jd->tx_len = len; |
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48 | jd->txq = g_memdup( buf, len ); |
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49 | |
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50 | /* Try if we can write it immediately so we don't have to do |
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51 | it via the event handler. If not, add the handler. (In |
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52 | most cases it probably won't be necessary.) */ |
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53 | if( jabber_write_callback( gc, jd->fd, GAIM_INPUT_WRITE ) ) |
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54 | jd->w_inpa = b_input_add( jd->fd, GAIM_INPUT_WRITE, jabber_write_callback, gc ); |
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55 | } |
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56 | else |
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57 | { |
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58 | /* Just add it to the buffer if it's already filled. The |
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59 | event handler is already set. */ |
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60 | jd->txq = g_renew( char, jd->txq, jd->tx_len + len ); |
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61 | memcpy( jd->txq + jd->tx_len, buf, len ); |
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62 | jd->tx_len += len; |
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63 | } |
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64 | |
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65 | /* FIXME: write_callback could've generated a real error! */ |
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66 | return 1; |
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67 | } |
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68 | |
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69 | static gboolean jabber_write_callback( gpointer data, gint fd, b_input_condition cond ) |
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70 | { |
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71 | struct gaim_connection *gc = data; |
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72 | struct jabber_data *jd = gc->proto_data; |
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73 | int st; |
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74 | |
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75 | if( jd->fd == -1 ) |
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76 | return FALSE; |
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77 | |
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78 | st = write( jd->fd, jd->txq, jd->tx_len ); |
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79 | |
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80 | if( st == jd->tx_len ) |
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81 | { |
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82 | /* We wrote everything, clear the buffer. */ |
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83 | g_free( jd->txq ); |
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84 | jd->txq = NULL; |
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85 | jd->tx_len = 0; |
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86 | |
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87 | return FALSE; |
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88 | } |
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89 | else if( st == 0 || ( st < 0 && !sockerr_again() ) ) |
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90 | { |
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91 | /* Set fd to -1 to make sure we won't write to it anymore. */ |
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92 | closesocket( jd->fd ); /* Shouldn't be necessary after errors? */ |
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93 | jd->fd = -1; |
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94 | |
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95 | hide_login_progress_error( gc, "Short write() to server" ); |
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96 | signoff( gc ); |
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97 | return FALSE; |
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98 | } |
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99 | else if( st > 0 ) |
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100 | { |
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101 | char *s; |
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102 | |
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103 | s = g_memdup( jd->txq + st, jd->tx_len - st ); |
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104 | jd->tx_len -= st; |
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105 | g_free( jd->txq ); |
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106 | jd->txq = s; |
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107 | |
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108 | return TRUE; |
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109 | } |
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110 | else |
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111 | { |
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112 | /* Just in case we had EINPROGRESS/EAGAIN: */ |
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113 | |
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114 | return TRUE; |
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115 | } |
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116 | } |
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117 | |
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118 | static gboolean jabber_read_callback( gpointer data, gint fd, b_input_condition cond ) |
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119 | { |
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120 | struct gaim_connection *gc = data; |
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121 | struct jabber_data *jd = gc->proto_data; |
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122 | char buf[512]; |
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123 | int st; |
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124 | |
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125 | if( jd->fd == -1 ) |
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126 | return FALSE; |
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127 | |
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128 | st = read( fd, buf, sizeof( buf ) ); |
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129 | |
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130 | if( st > 0 ) |
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131 | { |
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132 | /* Parse. */ |
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133 | if( !xt_feed( jd->xt, buf, st ) ) |
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134 | { |
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135 | hide_login_progress_error( gc, "XML stream error" ); |
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136 | signoff( gc ); |
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137 | return FALSE; |
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138 | } |
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139 | |
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140 | /* Execute all handlers. */ |
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141 | if( !xt_handle( jd->xt, NULL ) ) |
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142 | { |
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143 | /* Don't do anything, the handlers should have |
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144 | aborted the connection already... Or not? FIXME */ |
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145 | return FALSE; |
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146 | } |
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147 | |
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148 | if( jd->flags & JFLAG_STREAM_RESTART ) |
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149 | { |
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150 | jd->flags &= ~JFLAG_STREAM_RESTART; |
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151 | jabber_start_stream( gc ); |
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152 | } |
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153 | |
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154 | /* Garbage collection. */ |
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155 | xt_cleanup( jd->xt, NULL ); |
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156 | |
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157 | /* This is a bit hackish, unfortunately. Although xmltree |
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158 | has nifty event handler stuff, it only calls handlers |
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159 | when nodes are complete. Since the server should only |
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160 | send an opening <stream:stream> tag, we have to check |
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161 | this by hand. :-( */ |
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162 | if( !( jd->flags & JFLAG_STREAM_STARTED ) && jd->xt && jd->xt->root ) |
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163 | { |
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164 | if( g_strcasecmp( jd->xt->root->name, "stream:stream" ) == 0 ) |
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165 | { |
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166 | jd->flags |= JFLAG_STREAM_STARTED; |
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167 | |
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168 | /* If there's no version attribute, assume |
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169 | this is an old server that can't do SASL |
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170 | authentication. */ |
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171 | if( !sasl_supported( gc ) ) |
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172 | return jabber_start_iq_auth( gc ); |
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173 | } |
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174 | else |
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175 | { |
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176 | hide_login_progress_error( gc, "XML stream error" ); |
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177 | signoff( gc ); |
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178 | return FALSE; |
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179 | } |
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180 | } |
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181 | } |
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182 | else if( st == 0 || ( st < 0 && !sockerr_again() ) ) |
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183 | { |
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184 | closesocket( jd->fd ); |
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185 | jd->fd = -1; |
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186 | |
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187 | hide_login_progress_error( gc, "Error while reading from server" ); |
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188 | signoff( gc ); |
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189 | return FALSE; |
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190 | } |
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191 | |
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192 | /* EAGAIN/etc or a successful read. */ |
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193 | return TRUE; |
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194 | } |
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195 | |
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196 | gboolean jabber_connected_plain( gpointer data, gint source, b_input_condition cond ) |
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197 | { |
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198 | struct gaim_connection *gc = data; |
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199 | |
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200 | if( source == -1 ) |
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201 | { |
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202 | hide_login_progress( gc, "Could not connect to server" ); |
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203 | signoff( gc ); |
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204 | return FALSE; |
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205 | } |
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206 | |
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207 | set_login_progress( gc, 1, "Connected to server, logging in" ); |
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208 | |
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209 | return jabber_start_stream( gc ); |
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210 | } |
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211 | |
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212 | static xt_status jabber_end_of_stream( struct xt_node *node, gpointer data ) |
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213 | { |
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214 | return XT_ABORT; |
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215 | } |
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216 | |
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217 | static xt_status jabber_pkt_features( struct xt_node *node, gpointer data ) |
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218 | { |
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219 | struct gaim_connection *gc = data; |
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220 | struct jabber_data *jd = gc->proto_data; |
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221 | struct xt_node *c, *reply; |
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222 | |
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223 | c = xt_find_node( node->children, "starttls" ); |
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224 | if( c ) |
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225 | { |
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226 | /* |
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227 | jd->flags |= JFLAG_SUPPORTS_TLS; |
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228 | if( xt_find_node( c->children, "required" ) ) |
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229 | jd->flags |= JFLAG_REQUIRES_TLS; |
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230 | */ |
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231 | } |
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232 | |
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233 | if( ( c = xt_find_node( node->children, "bind" ) ) ) |
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234 | { |
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235 | reply = xt_new_node( "bind", NULL, xt_new_node( "resource", set_getstr( &gc->acc->set, "resource" ), NULL ) ); |
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236 | xt_add_attr( reply, "xmlns", "urn:ietf:params:xml:ns:xmpp-bind" ); |
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237 | reply = jabber_make_packet( "iq", "set", NULL, reply ); |
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238 | jabber_cache_packet( gc, reply ); |
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239 | |
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240 | if( !jabber_write_packet( gc, reply ) ) |
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241 | return XT_ABORT; |
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242 | |
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243 | jd->flags |= JFLAG_WAIT_BIND; |
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244 | } |
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245 | |
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246 | if( ( c = xt_find_node( node->children, "session" ) ) ) |
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247 | { |
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248 | reply = xt_new_node( "session", NULL, NULL ); |
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249 | xt_add_attr( reply, "xmlns", "urn:ietf:params:xml:ns:xmpp-session" ); |
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250 | reply = jabber_make_packet( "iq", "set", NULL, reply ); |
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251 | jabber_cache_packet( gc, reply ); |
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252 | |
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253 | if( !jabber_write_packet( gc, reply ) ) |
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254 | return XT_ABORT; |
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255 | |
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256 | jd->flags |= JFLAG_WAIT_SESSION; |
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257 | } |
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258 | |
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259 | /* This flag is already set if we authenticated via SASL, so now |
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260 | we can resume the session in the new stream, if we don't have |
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261 | to bind/initialize the session. */ |
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262 | if( jd->flags & JFLAG_AUTHENTICATED && ( jd->flags & ( JFLAG_WAIT_BIND | JFLAG_WAIT_SESSION ) ) == 0 ) |
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263 | { |
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264 | if( !jabber_get_roster( gc ) ) |
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265 | return XT_ABORT; |
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266 | } |
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267 | |
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268 | return XT_HANDLED; |
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269 | } |
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270 | |
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271 | static xt_status jabber_pkt_misc( struct xt_node *node, gpointer data ) |
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272 | { |
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273 | printf( "Received unknown packet:\n" ); |
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274 | xt_print( node ); |
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275 | |
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276 | return XT_HANDLED; |
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277 | } |
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278 | |
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279 | static const struct xt_handler_entry jabber_handlers[] = { |
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280 | { "stream:stream", "<root>", jabber_end_of_stream }, |
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281 | { "message", "stream:stream", jabber_pkt_message }, |
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282 | { "presence", "stream:stream", jabber_pkt_presence }, |
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283 | { "iq", "stream:stream", jabber_pkt_iq }, |
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284 | { "stream:features", "stream:stream", jabber_pkt_features }, |
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285 | { "mechanisms", "stream:features", sasl_pkt_mechanisms }, |
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286 | { "challenge", "stream:stream", sasl_pkt_challenge }, |
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287 | { "success", "stream:stream", sasl_pkt_result }, |
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288 | { "failure", "stream:stream", sasl_pkt_result }, |
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289 | { NULL, "stream:stream", jabber_pkt_misc }, |
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290 | { NULL, NULL, NULL } |
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291 | }; |
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292 | |
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293 | gboolean jabber_start_stream( struct gaim_connection *gc ) |
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294 | { |
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295 | struct jabber_data *jd = gc->proto_data; |
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296 | int st; |
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297 | char *greet; |
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298 | |
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299 | /* We'll start our stream now, so prepare everything to receive one |
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300 | from the server too. */ |
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301 | xt_free( jd->xt ); /* In case we're RE-starting. */ |
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302 | jd->xt = xt_new( gc ); |
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303 | jd->xt->handlers = (struct xt_handler_entry*) jabber_handlers; |
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304 | |
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305 | if( jd->r_inpa <= 0 ) |
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306 | jd->r_inpa = b_input_add( jd->fd, GAIM_INPUT_READ, jabber_read_callback, gc ); |
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307 | |
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308 | greet = g_strdup_printf( "<?xml version='1.0' ?>" |
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309 | "<stream:stream to=\"%s\" xmlns=\"jabber:client\" " |
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310 | "xmlns:stream=\"http://etherx.jabber.org/streams\" version=\"1.0\">", jd->server ); |
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311 | |
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312 | st = jabber_write( gc, greet, strlen( greet ) ); |
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313 | |
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314 | g_free( greet ); |
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315 | |
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316 | return st; |
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317 | } |
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318 | |
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319 | void jabber_end_stream( struct gaim_connection *gc ) |
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320 | { |
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321 | struct jabber_data *jd = gc->proto_data; |
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322 | |
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323 | /* Let's only do this if the queue is currently empty, otherwise it'd |
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324 | take too long anyway. */ |
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325 | if( jd->tx_len == 0 ) |
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326 | { |
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327 | char eos[] = "</stream:stream>"; |
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328 | struct xt_node *node; |
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329 | int st = 1; |
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330 | |
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331 | if( gc->flags & OPT_LOGGED_IN ) |
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332 | { |
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333 | node = jabber_make_packet( "presence", "unavailable", NULL, NULL ); |
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334 | st = jabber_write_packet( gc, node ); |
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335 | xt_free_node( node ); |
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336 | } |
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337 | |
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338 | if( st ) |
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339 | jabber_write( gc, eos, strlen( eos ) ); |
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340 | } |
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341 | } |
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