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 | #include "ssl_client.h" |
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26 | |
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27 | static gboolean jabber_write_callback( gpointer data, gint fd, b_input_condition cond ); |
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28 | static gboolean jabber_write_queue( struct im_connection *ic ); |
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29 | |
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30 | int jabber_write_packet( struct im_connection *ic, struct xt_node *node ) |
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31 | { |
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32 | char *buf; |
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33 | int st; |
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34 | |
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35 | buf = xt_to_string( node ); |
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36 | st = jabber_write( ic, buf, strlen( buf ) ); |
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37 | g_free( buf ); |
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38 | |
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39 | return st; |
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40 | } |
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41 | |
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42 | int jabber_write( struct im_connection *ic, char *buf, int len ) |
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43 | { |
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44 | struct jabber_data *jd = ic->proto_data; |
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45 | gboolean ret; |
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46 | |
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47 | if( jd->flags & JFLAG_XMLCONSOLE ) |
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48 | { |
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49 | char *msg; |
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50 | |
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51 | msg = g_strdup_printf( "TX: %s", buf ); |
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52 | imcb_buddy_msg( ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0 ); |
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53 | g_free( msg ); |
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54 | } |
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55 | |
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56 | if( jd->tx_len == 0 ) |
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57 | { |
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58 | /* If the queue is empty, allocate a new buffer. */ |
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59 | jd->tx_len = len; |
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60 | jd->txq = g_memdup( buf, len ); |
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61 | |
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62 | /* Try if we can write it immediately so we don't have to do |
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63 | it via the event handler. If not, add the handler. (In |
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64 | most cases it probably won't be necessary.) */ |
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65 | if( ( ret = jabber_write_queue( ic ) ) && jd->tx_len > 0 ) |
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66 | jd->w_inpa = b_input_add( jd->fd, GAIM_INPUT_WRITE, jabber_write_callback, ic ); |
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67 | } |
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68 | else |
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69 | { |
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70 | /* Just add it to the buffer if it's already filled. The |
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71 | event handler is already set. */ |
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72 | jd->txq = g_renew( char, jd->txq, jd->tx_len + len ); |
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73 | memcpy( jd->txq + jd->tx_len, buf, len ); |
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74 | jd->tx_len += len; |
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75 | |
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76 | /* The return value for write() doesn't necessarily mean |
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77 | that everything got sent, it mainly means that the |
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78 | connection (officially) still exists and can still |
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79 | be accessed without hitting SIGSEGV. IOW: */ |
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80 | ret = TRUE; |
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81 | } |
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82 | |
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83 | return ret; |
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84 | } |
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85 | |
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86 | /* Splitting up in two separate functions: One to use as a callback and one |
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87 | to use in the function above to escape from having to wait for the event |
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88 | handler to call us, if possible. |
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89 | |
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90 | Two different functions are necessary because of the return values: The |
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91 | callback should only return TRUE if the write was successful AND if the |
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92 | buffer is not empty yet (ie. if the handler has to be called again when |
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93 | the socket is ready for more data). */ |
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94 | static gboolean jabber_write_callback( gpointer data, gint fd, b_input_condition cond ) |
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95 | { |
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96 | struct jabber_data *jd = ((struct im_connection *)data)->proto_data; |
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97 | |
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98 | return jd->fd != -1 && |
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99 | jabber_write_queue( data ) && |
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100 | jd->tx_len > 0; |
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101 | } |
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102 | |
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103 | static gboolean jabber_write_queue( struct im_connection *ic ) |
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104 | { |
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105 | struct jabber_data *jd = ic->proto_data; |
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106 | int st; |
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107 | |
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108 | if( jd->ssl ) |
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109 | st = ssl_write( jd->ssl, jd->txq, jd->tx_len ); |
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110 | else |
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111 | st = write( jd->fd, jd->txq, jd->tx_len ); |
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112 | |
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113 | if( st == jd->tx_len ) |
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114 | { |
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115 | /* We wrote everything, clear the buffer. */ |
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116 | g_free( jd->txq ); |
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117 | jd->txq = NULL; |
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118 | jd->tx_len = 0; |
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119 | |
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120 | return TRUE; |
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121 | } |
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122 | else if( st == 0 || ( st < 0 && !ssl_sockerr_again( jd->ssl ) ) ) |
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123 | { |
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124 | /* Set fd to -1 to make sure we won't write to it anymore. */ |
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125 | closesocket( jd->fd ); /* Shouldn't be necessary after errors? */ |
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126 | jd->fd = -1; |
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127 | |
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128 | imcb_error( ic, "Short write() to server" ); |
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129 | imc_logout( ic, TRUE ); |
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130 | return FALSE; |
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131 | } |
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132 | else if( st > 0 ) |
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133 | { |
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134 | char *s; |
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135 | |
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136 | s = g_memdup( jd->txq + st, jd->tx_len - st ); |
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137 | jd->tx_len -= st; |
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138 | g_free( jd->txq ); |
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139 | jd->txq = s; |
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140 | |
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141 | return TRUE; |
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142 | } |
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143 | else |
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144 | { |
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145 | /* Just in case we had EINPROGRESS/EAGAIN: */ |
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146 | |
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147 | return TRUE; |
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148 | } |
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149 | } |
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150 | |
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151 | static gboolean jabber_read_callback( gpointer data, gint fd, b_input_condition cond ) |
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152 | { |
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153 | struct im_connection *ic = data; |
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154 | struct jabber_data *jd = ic->proto_data; |
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155 | char buf[512]; |
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156 | int st; |
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157 | |
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158 | if( jd->fd == -1 ) |
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159 | return FALSE; |
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160 | |
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161 | if( jd->ssl ) |
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162 | st = ssl_read( jd->ssl, buf, sizeof( buf ) ); |
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163 | else |
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164 | st = read( jd->fd, buf, sizeof( buf ) ); |
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165 | |
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166 | if( st > 0 ) |
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167 | { |
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168 | /* Parse. */ |
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169 | if( xt_feed( jd->xt, buf, st ) < 0 ) |
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170 | { |
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171 | imcb_error( ic, "XML stream error" ); |
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172 | imc_logout( ic, TRUE ); |
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173 | return FALSE; |
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174 | } |
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175 | |
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176 | /* Execute all handlers. */ |
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177 | if( !xt_handle( jd->xt, NULL, 1 ) ) |
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178 | { |
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179 | /* Don't do anything, the handlers should have |
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180 | aborted the connection already. */ |
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181 | return FALSE; |
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182 | } |
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183 | |
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184 | if( jd->flags & JFLAG_STREAM_RESTART ) |
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185 | { |
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186 | jd->flags &= ~JFLAG_STREAM_RESTART; |
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187 | jabber_start_stream( ic ); |
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188 | } |
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189 | |
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190 | /* Garbage collection. */ |
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191 | xt_cleanup( jd->xt, NULL, 1 ); |
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192 | |
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193 | /* This is a bit hackish, unfortunately. Although xmltree |
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194 | has nifty event handler stuff, it only calls handlers |
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195 | when nodes are complete. Since the server should only |
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196 | send an opening <stream:stream> tag, we have to check |
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197 | this by hand. :-( */ |
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198 | if( !( jd->flags & JFLAG_STREAM_STARTED ) && jd->xt && jd->xt->root ) |
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199 | { |
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200 | if( g_strcasecmp( jd->xt->root->name, "stream:stream" ) == 0 ) |
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201 | { |
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202 | jd->flags |= JFLAG_STREAM_STARTED; |
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203 | |
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204 | /* If there's no version attribute, assume |
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205 | this is an old server that can't do SASL |
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206 | authentication. */ |
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207 | if( !sasl_supported( ic ) ) |
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208 | { |
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209 | /* If there's no version= tag, we suppose |
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210 | this server does NOT implement: XMPP 1.0, |
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211 | SASL and TLS. */ |
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212 | if( set_getbool( &ic->acc->set, "tls" ) ) |
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213 | { |
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214 | imcb_error( ic, "TLS is turned on for this " |
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215 | "account, but is not supported by this server" ); |
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216 | imc_logout( ic, FALSE ); |
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217 | return FALSE; |
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218 | } |
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219 | else |
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220 | { |
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221 | return jabber_init_iq_auth( ic ); |
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222 | } |
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223 | } |
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224 | } |
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225 | else |
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226 | { |
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227 | imcb_error( ic, "XML stream error" ); |
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228 | imc_logout( ic, TRUE ); |
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229 | return FALSE; |
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230 | } |
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231 | } |
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232 | } |
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233 | else if( st == 0 || ( st < 0 && !ssl_sockerr_again( jd->ssl ) ) ) |
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234 | { |
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235 | closesocket( jd->fd ); |
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236 | jd->fd = -1; |
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237 | |
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238 | imcb_error( ic, "Error while reading from server" ); |
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239 | imc_logout( ic, TRUE ); |
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240 | return FALSE; |
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241 | } |
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242 | |
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243 | if( ssl_pending( jd->ssl ) ) |
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244 | /* OpenSSL empties the TCP buffers completely but may keep some |
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245 | data in its internap buffers. select() won't see that, but |
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246 | ssl_pending() does. */ |
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247 | return jabber_read_callback( data, fd, cond ); |
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248 | else |
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249 | return TRUE; |
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250 | } |
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251 | |
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252 | gboolean jabber_connected_plain( gpointer data, gint source, b_input_condition cond ) |
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253 | { |
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254 | struct im_connection *ic = data; |
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255 | |
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256 | if( g_slist_find( jabber_connections, ic ) == NULL ) |
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257 | return FALSE; |
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258 | |
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259 | if( source == -1 ) |
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260 | { |
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261 | imcb_error( ic, "Could not connect to server" ); |
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262 | imc_logout( ic, TRUE ); |
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263 | return FALSE; |
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264 | } |
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265 | |
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266 | imcb_log( ic, "Connected to server, logging in" ); |
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267 | |
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268 | return jabber_start_stream( ic ); |
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269 | } |
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270 | |
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271 | gboolean jabber_connected_ssl( gpointer data, void *source, b_input_condition cond ) |
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272 | { |
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273 | struct im_connection *ic = data; |
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274 | struct jabber_data *jd; |
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275 | |
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276 | if( g_slist_find( jabber_connections, ic ) == NULL ) |
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277 | return FALSE; |
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278 | |
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279 | jd = ic->proto_data; |
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280 | |
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281 | if( source == NULL ) |
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282 | { |
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283 | /* The SSL connection will be cleaned up by the SSL lib |
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284 | already, set it to NULL here to prevent a double cleanup: */ |
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285 | jd->ssl = NULL; |
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286 | |
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287 | imcb_error( ic, "Could not connect to server" ); |
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288 | imc_logout( ic, TRUE ); |
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289 | return FALSE; |
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290 | } |
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291 | |
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292 | imcb_log( ic, "Connected to server, logging in" ); |
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293 | |
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294 | return jabber_start_stream( ic ); |
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295 | } |
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296 | |
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297 | static xt_status jabber_end_of_stream( struct xt_node *node, gpointer data ) |
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298 | { |
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299 | imc_logout( data, TRUE ); |
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300 | return XT_ABORT; |
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301 | } |
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302 | |
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303 | static xt_status jabber_pkt_features( struct xt_node *node, gpointer data ) |
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304 | { |
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305 | struct im_connection *ic = data; |
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306 | struct jabber_data *jd = ic->proto_data; |
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307 | struct xt_node *c, *reply; |
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308 | int trytls; |
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309 | |
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310 | trytls = g_strcasecmp( set_getstr( &ic->acc->set, "tls" ), "try" ) == 0; |
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311 | c = xt_find_node( node->children, "starttls" ); |
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312 | if( c && !jd->ssl ) |
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313 | { |
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314 | /* If the server advertises the STARTTLS feature and if we're |
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315 | not in a secure connection already: */ |
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316 | |
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317 | c = xt_find_node( c->children, "required" ); |
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318 | |
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319 | if( c && ( !trytls && !set_getbool( &ic->acc->set, "tls" ) ) ) |
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320 | { |
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321 | imcb_error( ic, "Server requires TLS connections, but TLS is turned off for this account" ); |
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322 | imc_logout( ic, FALSE ); |
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323 | |
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324 | return XT_ABORT; |
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325 | } |
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326 | |
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327 | /* Only run this if the tls setting is set to true or try: */ |
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328 | if( ( trytls || set_getbool( &ic->acc->set, "tls" ) ) ) |
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329 | { |
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330 | reply = xt_new_node( "starttls", NULL, NULL ); |
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331 | xt_add_attr( reply, "xmlns", XMLNS_TLS ); |
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332 | if( !jabber_write_packet( ic, reply ) ) |
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333 | { |
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334 | xt_free_node( reply ); |
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335 | return XT_ABORT; |
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336 | } |
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337 | xt_free_node( reply ); |
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338 | |
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339 | return XT_HANDLED; |
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340 | } |
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341 | } |
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342 | else if( !c && !jd->ssl ) |
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343 | { |
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344 | /* If the server does not advertise the STARTTLS feature and |
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345 | we're not in a secure connection already: (Servers have a |
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346 | habit of not advertising <starttls/> anymore when already |
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347 | using SSL/TLS. */ |
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348 | |
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349 | if( !trytls && set_getbool( &ic->acc->set, "tls" ) ) |
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350 | { |
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351 | imcb_error( ic, "TLS is turned on for this account, but is not supported by this server" ); |
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352 | imc_logout( ic, FALSE ); |
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353 | |
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354 | return XT_ABORT; |
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355 | } |
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356 | } |
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357 | |
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358 | /* This one used to be in jabber_handlers[], but it has to be done |
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359 | from here to make sure the TLS session will be initialized |
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360 | properly before we attempt SASL authentication. */ |
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361 | if( ( c = xt_find_node( node->children, "mechanisms" ) ) ) |
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362 | { |
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363 | if( sasl_pkt_mechanisms( c, data ) == XT_ABORT ) |
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364 | return XT_ABORT; |
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365 | } |
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366 | /* If the server *SEEMS* to support SASL authentication but doesn't |
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367 | support it after all, we should try to do authentication the |
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368 | other way. jabber.com doesn't seem to do SASL while it pretends |
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369 | to be XMPP 1.0 compliant! */ |
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370 | else if( !( jd->flags & JFLAG_AUTHENTICATED ) && sasl_supported( ic ) ) |
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371 | { |
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372 | if( !jabber_init_iq_auth( ic ) ) |
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373 | return XT_ABORT; |
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374 | } |
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375 | |
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376 | if( ( c = xt_find_node( node->children, "bind" ) ) ) |
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377 | jd->flags |= JFLAG_WANT_BIND; |
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378 | |
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379 | if( ( c = xt_find_node( node->children, "session" ) ) ) |
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380 | jd->flags |= JFLAG_WANT_SESSION; |
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381 | |
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382 | /* This flag is already set if we authenticated via SASL, so now |
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383 | we can resume the session in the new stream, if we don't have |
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384 | to bind/initialize the session. */ |
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385 | if( jd->flags & JFLAG_AUTHENTICATED && ( jd->flags & ( JFLAG_WANT_BIND | JFLAG_WANT_SESSION ) ) == 0 ) |
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386 | { |
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387 | if( !jabber_get_roster( ic ) ) |
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388 | return XT_ABORT; |
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389 | } |
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390 | else if( jd->flags & JFLAG_AUTHENTICATED ) |
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391 | { |
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392 | return jabber_pkt_bind_sess( ic, NULL, NULL ); |
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393 | } |
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394 | |
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395 | return XT_HANDLED; |
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396 | } |
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397 | |
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398 | static xt_status jabber_pkt_proceed_tls( struct xt_node *node, gpointer data ) |
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399 | { |
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400 | struct im_connection *ic = data; |
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401 | struct jabber_data *jd = ic->proto_data; |
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402 | char *xmlns; |
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403 | |
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404 | xmlns = xt_find_attr( node, "xmlns" ); |
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405 | |
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406 | /* Just ignore it when it doesn't seem to be TLS-related (is that at |
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407 | all possible??). */ |
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408 | if( !xmlns || strcmp( xmlns, XMLNS_TLS ) != 0 ) |
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409 | return XT_HANDLED; |
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410 | |
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411 | /* We don't want event handlers to touch our TLS session while it's |
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412 | still initializing! */ |
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413 | b_event_remove( jd->r_inpa ); |
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414 | if( jd->tx_len > 0 ) |
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415 | { |
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416 | /* Actually the write queue should be empty here, but just |
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417 | to be sure... */ |
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418 | b_event_remove( jd->w_inpa ); |
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419 | g_free( jd->txq ); |
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420 | jd->txq = NULL; |
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421 | jd->tx_len = 0; |
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422 | } |
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423 | jd->w_inpa = jd->r_inpa = 0; |
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424 | |
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425 | imcb_log( ic, "Converting stream to TLS" ); |
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426 | |
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427 | jd->flags |= JFLAG_STARTTLS_DONE; |
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428 | jd->ssl = ssl_starttls( jd->fd, jabber_connected_ssl, ic ); |
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429 | |
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430 | return XT_HANDLED; |
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431 | } |
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432 | |
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433 | static xt_status jabber_pkt_stream_error( struct xt_node *node, gpointer data ) |
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434 | { |
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435 | struct im_connection *ic = data; |
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436 | int allow_reconnect = TRUE; |
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437 | struct jabber_error *err; |
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438 | |
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439 | err = jabber_error_parse( node, XMLNS_STREAM_ERROR ); |
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440 | |
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441 | /* Tssk... */ |
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442 | if( err->code == NULL ) |
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443 | { |
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444 | imcb_error( ic, "Unknown stream error reported by server" ); |
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445 | imc_logout( ic, allow_reconnect ); |
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446 | jabber_error_free( err ); |
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447 | return XT_ABORT; |
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448 | } |
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449 | |
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450 | /* We know that this is a fatal error. If it's a "conflict" error, we |
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451 | should turn off auto-reconnect to make sure we won't get some nasty |
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452 | infinite loop! */ |
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453 | if( strcmp( err->code, "conflict" ) == 0 ) |
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454 | { |
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455 | imcb_error( ic, "Account and resource used from a different location" ); |
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456 | allow_reconnect = FALSE; |
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457 | } |
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458 | else |
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459 | { |
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460 | imcb_error( ic, "Stream error: %s%s%s", err->code, err->text ? ": " : "", |
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461 | err->text ? err->text : "" ); |
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462 | } |
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463 | |
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464 | jabber_error_free( err ); |
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465 | imc_logout( ic, allow_reconnect ); |
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466 | |
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467 | return XT_ABORT; |
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468 | } |
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469 | |
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470 | static xt_status jabber_xmlconsole( struct xt_node *node, gpointer data ) |
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471 | { |
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472 | struct im_connection *ic = data; |
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473 | struct jabber_data *jd = ic->proto_data; |
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474 | |
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475 | if( jd->flags & JFLAG_XMLCONSOLE ) |
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476 | { |
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477 | char *msg, *pkt; |
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478 | |
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479 | pkt = xt_to_string( node ); |
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480 | msg = g_strdup_printf( "RX: %s", pkt ); |
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481 | imcb_buddy_msg( ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0 ); |
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482 | g_free( msg ); |
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483 | g_free( pkt ); |
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484 | } |
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485 | |
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486 | return XT_NEXT; |
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487 | } |
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488 | |
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489 | static const struct xt_handler_entry jabber_handlers[] = { |
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490 | { NULL, "stream:stream", jabber_xmlconsole }, |
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491 | { "stream:stream", "<root>", jabber_end_of_stream }, |
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492 | { "message", "stream:stream", jabber_pkt_message }, |
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493 | { "presence", "stream:stream", jabber_pkt_presence }, |
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494 | { "iq", "stream:stream", jabber_pkt_iq }, |
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495 | { "stream:features", "stream:stream", jabber_pkt_features }, |
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496 | { "stream:error", "stream:stream", jabber_pkt_stream_error }, |
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497 | { "proceed", "stream:stream", jabber_pkt_proceed_tls }, |
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498 | { "challenge", "stream:stream", sasl_pkt_challenge }, |
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499 | { "success", "stream:stream", sasl_pkt_result }, |
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500 | { "failure", "stream:stream", sasl_pkt_result }, |
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501 | { NULL, NULL, NULL } |
---|
502 | }; |
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503 | |
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504 | gboolean jabber_start_stream( struct im_connection *ic ) |
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505 | { |
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506 | struct jabber_data *jd = ic->proto_data; |
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507 | int st; |
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508 | char *greet; |
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509 | |
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510 | /* We'll start our stream now, so prepare everything to receive one |
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511 | from the server too. */ |
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512 | xt_free( jd->xt ); /* In case we're RE-starting. */ |
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513 | jd->xt = xt_new( jabber_handlers, ic ); |
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514 | |
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515 | if( jd->r_inpa <= 0 ) |
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516 | jd->r_inpa = b_input_add( jd->fd, GAIM_INPUT_READ, jabber_read_callback, ic ); |
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517 | |
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518 | greet = g_strdup_printf( "%s<stream:stream to=\"%s\" xmlns=\"jabber:client\" " |
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519 | "xmlns:stream=\"http://etherx.jabber.org/streams\" version=\"1.0\">", |
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520 | ( jd->flags & JFLAG_STARTTLS_DONE ) ? "" : "<?xml version='1.0' ?>", |
---|
521 | jd->server ); |
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522 | |
---|
523 | st = jabber_write( ic, greet, strlen( greet ) ); |
---|
524 | |
---|
525 | g_free( greet ); |
---|
526 | |
---|
527 | return st; |
---|
528 | } |
---|
529 | |
---|
530 | void jabber_end_stream( struct im_connection *ic ) |
---|
531 | { |
---|
532 | struct jabber_data *jd = ic->proto_data; |
---|
533 | |
---|
534 | /* Let's only do this if the queue is currently empty, otherwise it'd |
---|
535 | take too long anyway. */ |
---|
536 | if( jd->tx_len == 0 ) |
---|
537 | { |
---|
538 | char eos[] = "</stream:stream>"; |
---|
539 | struct xt_node *node; |
---|
540 | int st = 1; |
---|
541 | |
---|
542 | if( ic->flags & OPT_LOGGED_IN ) |
---|
543 | { |
---|
544 | node = jabber_make_packet( "presence", "unavailable", NULL, NULL ); |
---|
545 | st = jabber_write_packet( ic, node ); |
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546 | xt_free_node( node ); |
---|
547 | } |
---|
548 | |
---|
549 | if( st ) |
---|
550 | jabber_write( ic, eos, strlen( eos ) ); |
---|
551 | } |
---|
552 | } |
---|