1 | /********************************************************************\ |
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2 | * BitlBee -- An IRC to other IM-networks gateway * |
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3 | * * |
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4 | * Copyright 2007 Uli Meis <a.sporto+bee@gmail.com> * |
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5 | \********************************************************************/ |
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6 | |
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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 with |
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19 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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20 | if not, write to the Free Software Foundation, Inc., 59 Temple Place, |
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21 | Suite 330, Boston, MA 02111-1307 USA |
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22 | */ |
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23 | |
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24 | #define BITLBEE_CORE |
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25 | #include "bitlbee.h" |
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26 | #include "ft.h" |
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27 | #include "dcc.h" |
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28 | #include <poll.h> |
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29 | #include <netinet/tcp.h> |
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30 | |
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31 | /* |
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32 | * Since that might be confusing a note on naming: |
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33 | * |
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34 | * Generic dcc functions start with |
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35 | * |
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36 | * dcc_ |
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37 | * |
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38 | * ,methods specific to DCC SEND start with |
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39 | * |
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40 | * dccs_ |
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41 | * |
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42 | * . Since we can be on both ends of a DCC SEND, |
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43 | * functions specific to one end are called |
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44 | * |
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45 | * dccs_send and dccs_recv |
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46 | * |
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47 | * ,respectively. |
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48 | */ |
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49 | |
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50 | |
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51 | /* |
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52 | * used to generate a unique local transfer id the user |
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53 | * can use to reject/cancel transfers |
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54 | */ |
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55 | unsigned int local_transfer_id=1; |
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56 | |
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57 | /* |
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58 | * just for debugging the nr. of chunks we received from im-protocols and the total data |
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59 | */ |
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60 | unsigned int receivedchunks=0, receiveddata=0; |
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61 | |
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62 | /* |
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63 | * If using DCC SEND AHEAD this value will be set before the first transfer starts. |
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64 | * Not that in this case it degenerates to the maximum message size to send() and |
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65 | * has nothing to do with packets. |
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66 | */ |
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67 | #ifdef DCC_SEND_AHEAD |
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68 | int max_packet_size = DCC_PACKET_SIZE; |
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69 | #else |
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70 | int max_packet_size = 0; |
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71 | #endif |
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72 | |
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73 | static void dcc_finish( file_transfer_t *file ); |
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74 | static void dcc_close( file_transfer_t *file ); |
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75 | gboolean dccs_send_proto( gpointer data, gint fd, b_input_condition cond ); |
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76 | gboolean dcc_listen( dcc_file_transfer_t *df, struct sockaddr_storage **saddr_ptr ); |
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77 | int dccs_send_request( struct dcc_file_transfer *df, char *user_nick, struct sockaddr_storage *saddr ); |
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78 | |
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79 | /* As defined in ft.h */ |
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80 | file_transfer_t *imcb_file_send_start( struct im_connection *ic, char *handle, char *file_name, size_t file_size ) |
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81 | { |
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82 | user_t *u = user_findhandle( ic, handle ); |
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83 | /* one could handle this more intelligent like imcb_buddy_msg. |
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84 | * can't call it directly though cause it does some wrapping. |
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85 | * Maybe give imcb_buddy_msg a parameter NO_WRAPPING? */ |
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86 | if (!u) return NULL; |
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87 | |
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88 | return dccs_send_start( ic, u->nick, file_name, file_size ); |
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89 | }; |
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90 | |
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91 | /* As defined in ft.h */ |
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92 | void imcb_file_canceled( file_transfer_t *file, char *reason ) |
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93 | { |
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94 | if( file->canceled ) |
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95 | file->canceled( file, reason ); |
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96 | |
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97 | dcc_close( file ); |
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98 | } |
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99 | |
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100 | /* As defined in ft.h */ |
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101 | gboolean imcb_file_write( file_transfer_t *file, gpointer data, size_t data_size ) |
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102 | { |
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103 | return dccs_send_write( file, data, data_size ); |
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104 | } |
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105 | |
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106 | /* This is where the sending magic starts... */ |
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107 | file_transfer_t *dccs_send_start( struct im_connection *ic, char *user_nick, char *file_name, size_t file_size ) |
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108 | { |
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109 | file_transfer_t *file; |
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110 | dcc_file_transfer_t *df; |
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111 | struct sockaddr_storage **saddr; |
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112 | |
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113 | if( file_size > global.conf->max_filetransfer_size ) |
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114 | return NULL; |
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115 | |
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116 | /* alloc stuff */ |
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117 | file = g_new0( file_transfer_t, 1 ); |
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118 | file->priv = df = g_new0( dcc_file_transfer_t, 1); |
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119 | file->file_size = file_size; |
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120 | file->file_name = g_strdup( file_name ); |
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121 | file->local_id = local_transfer_id++; |
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122 | df->ic = ic; |
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123 | df->ft = file; |
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124 | |
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125 | /* listen and request */ |
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126 | if( !dcc_listen( df, saddr ) || |
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127 | !dccs_send_request( df, user_nick, *saddr ) ) |
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128 | return NULL; |
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129 | |
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130 | g_free( *saddr ); |
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131 | |
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132 | /* watch */ |
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133 | df->watch_in = b_input_add( df->fd, GAIM_INPUT_READ, dccs_send_proto, df ); |
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134 | |
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135 | df->ic->irc->file_transfers = g_slist_prepend( df->ic->irc->file_transfers, file ); |
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136 | |
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137 | return file; |
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138 | } |
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139 | |
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140 | /* Used pretty much everywhere in the code to abort a transfer */ |
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141 | gboolean dcc_abort( dcc_file_transfer_t *df, char *reason, ... ) |
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142 | { |
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143 | file_transfer_t *file = df->ft; |
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144 | va_list params; |
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145 | va_start( params, reason ); |
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146 | char *msg = g_strdup_vprintf( reason, params ); |
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147 | va_end( params ); |
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148 | |
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149 | file->status |= FT_STATUS_CANCELED; |
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150 | |
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151 | if( file->canceled ) |
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152 | file->canceled( file, msg ); |
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153 | else |
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154 | imcb_log( df->ic, "DCC transfer aborted: %s", msg ); |
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155 | |
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156 | g_free( msg ); |
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157 | |
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158 | dcc_close( df->ft ); |
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159 | |
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160 | return FALSE; |
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161 | } |
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162 | |
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163 | /* used extensively for socket operations */ |
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164 | #define ASSERTSOCKOP(op, msg) \ |
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165 | if( (op) == -1 ) \ |
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166 | return dcc_abort( df , msg ": %s", strerror( errno ) ); |
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167 | |
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168 | /* Creates the "DCC SEND" line and sends it to the server */ |
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169 | int dccs_send_request( struct dcc_file_transfer *df, char *user_nick, struct sockaddr_storage *saddr ) |
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170 | { |
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171 | char ipaddr[INET6_ADDRSTRLEN]; |
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172 | const void *netaddr; |
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173 | int port; |
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174 | char *cmd; |
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175 | |
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176 | if( saddr->ss_family == AF_INET ) |
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177 | { |
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178 | struct sockaddr_in *saddr_ipv4 = ( struct sockaddr_in *) saddr; |
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179 | |
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180 | /* |
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181 | * this is so ridiculous. We're supposed to convert the address to |
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182 | * host byte order!!! Let's exclude anyone running big endian just |
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183 | * for the fun of it... |
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184 | */ |
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185 | sprintf( ipaddr, "%d", |
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186 | htonl( saddr_ipv4->sin_addr.s_addr ) ); |
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187 | port = saddr_ipv4->sin_port; |
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188 | } else |
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189 | { |
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190 | struct sockaddr_in6 *saddr_ipv6 = ( struct sockaddr_in6 *) saddr; |
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191 | |
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192 | netaddr = &saddr_ipv6->sin6_addr.s6_addr; |
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193 | port = saddr_ipv6->sin6_port; |
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194 | |
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195 | /* |
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196 | * Didn't find docs about this, but it seems that's the way irssi does it |
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197 | */ |
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198 | if( !inet_ntop( saddr->ss_family, netaddr, ipaddr, sizeof( ipaddr ) ) ) |
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199 | return dcc_abort( df, "inet_ntop failed: %s", strerror( errno ) ); |
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200 | } |
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201 | |
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202 | port = ntohs( port ); |
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203 | |
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204 | cmd = g_strdup_printf( "\001DCC SEND %s %s %u %zu\001", |
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205 | df->ft->file_name, ipaddr, port, df->ft->file_size ); |
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206 | |
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207 | if ( !irc_msgfrom( df->ic->irc, user_nick, cmd ) ) |
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208 | return dcc_abort( df, "couldn't send 'DCC SEND' message to %s", user_nick ); |
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209 | |
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210 | g_free( cmd ); |
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211 | |
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212 | /* message is sortof redundant cause the users client probably informs him about that. remove? */ |
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213 | imcb_log( df->ic, "Transferring file %s: Chose local address %s for DCC connection", df->ft->file_name, ipaddr ); |
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214 | |
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215 | return TRUE; |
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216 | } |
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217 | |
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218 | /* |
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219 | * Creates a listening socket and returns it in saddr_ptr. |
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220 | */ |
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221 | gboolean dcc_listen( dcc_file_transfer_t *df, struct sockaddr_storage **saddr_ptr ) |
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222 | { |
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223 | file_transfer_t *file = df->ft; |
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224 | struct sockaddr_storage *saddr; |
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225 | int fd; |
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226 | char hostname[ HOST_NAME_MAX + 1 ]; |
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227 | struct addrinfo hints, *rp; |
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228 | socklen_t ssize = sizeof( struct sockaddr_storage ); |
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229 | |
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230 | /* won't be long till someone asks for this to be configurable :) */ |
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231 | |
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232 | ASSERTSOCKOP( gethostname( hostname, sizeof( hostname ) ), "gethostname()" ); |
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233 | |
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234 | memset( &hints, 0, sizeof( struct addrinfo ) ); |
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235 | hints.ai_socktype = SOCK_STREAM; |
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236 | hints.ai_flags = AI_NUMERICSERV; |
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237 | |
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238 | if ( getaddrinfo( hostname, "0", &hints, &rp ) != 0 ) |
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239 | return dcc_abort( df, "getaddrinfo()" ); |
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240 | |
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241 | saddr = g_new( struct sockaddr_storage, 1 ); |
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242 | |
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243 | *saddr_ptr = saddr; |
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244 | |
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245 | memcpy( saddr, rp->ai_addr, rp->ai_addrlen ); |
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246 | |
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247 | ASSERTSOCKOP( fd = df->fd = socket( saddr->ss_family, SOCK_STREAM, 0 ), "Opening socket" ); |
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248 | |
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249 | ASSERTSOCKOP( bind( fd, ( struct sockaddr *)saddr, rp->ai_addrlen ), "Binding socket" ); |
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250 | |
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251 | freeaddrinfo( rp ); |
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252 | |
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253 | ASSERTSOCKOP( getsockname( fd, ( struct sockaddr *)saddr, &ssize ), "Getting socket name" ); |
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254 | |
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255 | ASSERTSOCKOP( listen( fd, 1 ), "Making socket listen" ); |
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256 | |
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257 | file->status = FT_STATUS_LISTENING; |
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258 | |
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259 | return TRUE; |
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260 | } |
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261 | |
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262 | /* |
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263 | * After setup, the transfer itself is handled entirely by this function. |
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264 | * There are basically four things to handle: connect, receive, send, and error. |
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265 | */ |
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266 | gboolean dccs_send_proto( gpointer data, gint fd, b_input_condition cond ) |
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267 | { |
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268 | dcc_file_transfer_t *df = data; |
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269 | file_transfer_t *file = df->ft; |
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270 | struct pollfd pfd = { .fd = fd, .events = POLLHUP|POLLERR|POLLIN|POLLOUT }; |
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271 | short revents; |
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272 | |
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273 | if ( poll( &pfd, 1, 0 ) == -1 ) |
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274 | { |
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275 | imcb_log( df->ic, "poll() failed, weird!" ); |
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276 | revents = 0; |
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277 | }; |
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278 | |
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279 | revents = pfd.revents; |
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280 | |
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281 | if( revents & POLLERR ) |
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282 | { |
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283 | int sockerror; |
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284 | socklen_t errlen = sizeof( sockerror ); |
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285 | |
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286 | if ( getsockopt( fd, SOL_SOCKET, SO_ERROR, &sockerror, &errlen ) ) |
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287 | return dcc_abort( df, "getsockopt() failed, unknown socket error (weird!)" ); |
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288 | |
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289 | return dcc_abort( df, "Socket error: %s", strerror( sockerror ) ); |
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290 | } |
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291 | |
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292 | if( revents & POLLHUP ) |
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293 | return dcc_abort( df, "Remote end closed connection" ); |
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294 | |
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295 | if( ( revents & POLLIN ) && |
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296 | ( file->status & FT_STATUS_LISTENING ) ) |
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297 | { |
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298 | struct sockaddr *clt_addr; |
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299 | socklen_t ssize = sizeof( clt_addr ); |
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300 | |
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301 | /* Connect */ |
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302 | |
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303 | ASSERTSOCKOP( df->fd = accept( fd, (struct sockaddr *) &clt_addr, &ssize ), "Accepting connection" ); |
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304 | |
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305 | closesocket( fd ); |
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306 | fd = df->fd; |
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307 | file->status = FT_STATUS_TRANSFERING; |
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308 | sock_make_nonblocking( fd ); |
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309 | |
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310 | #ifdef DCC_SEND_AHEAD |
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311 | /* |
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312 | * use twice the maximum segment size as a maximum for calls to send(). |
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313 | */ |
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314 | if( max_packet_size == 0 ) |
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315 | { |
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316 | unsigned int mpslen = sizeof( max_packet_size ); |
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317 | if( getsockopt( fd, IPPROTO_TCP, TCP_MAXSEG, &max_packet_size, &mpslen ) ) |
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318 | return dcc_abort( df, "getsockopt() failed" ); |
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319 | max_packet_size *= 2; |
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320 | } |
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321 | #endif |
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322 | /* IM protocol callback */ |
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323 | |
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324 | if( file->accept ) |
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325 | file->accept( file ); |
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326 | /* reschedule for reading on new fd */ |
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327 | df->watch_in = b_input_add( fd, GAIM_INPUT_READ, dccs_send_proto, df ); |
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328 | |
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329 | return FALSE; |
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330 | } |
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331 | |
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332 | if( revents & POLLIN ) |
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333 | { |
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334 | int bytes_received; |
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335 | int ret; |
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336 | |
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337 | ASSERTSOCKOP( ret = recv( fd, &bytes_received, sizeof( bytes_received ), MSG_PEEK ), "Receiving" ); |
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338 | |
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339 | if( ret == 0 ) |
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340 | return dcc_abort( df, "Remote end closed connection" ); |
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341 | |
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342 | if( ret < 4 ) |
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343 | { |
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344 | imcb_log( df->ic, "WARNING: DCC SEND: receiver sent only 2 bytes instead of 4, shouldn't happen too often!" ); |
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345 | return TRUE; |
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346 | } |
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347 | |
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348 | ASSERTSOCKOP( ret = recv( fd, &bytes_received, sizeof( bytes_received ), 0 ), "Receiving" ); |
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349 | if( ret != 4 ) |
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350 | return dcc_abort( df, "MSG_PEEK'ed 4, but can only dequeue %d bytes", ret ); |
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351 | |
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352 | bytes_received = ntohl( bytes_received ); |
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353 | |
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354 | /* If any of this is actually happening, the receiver should buy a new IRC client */ |
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355 | |
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356 | if ( bytes_received > df->bytes_sent ) |
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357 | return dcc_abort( df, "Receiver magically received more bytes than sent ( %d > %d ) (BUG at receiver?)", bytes_received, df->bytes_sent ); |
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358 | |
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359 | if ( bytes_received < file->bytes_transferred ) |
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360 | return dcc_abort( df, "Receiver lost bytes? ( has %d, had %d ) (BUG at receiver?)", bytes_received, file->bytes_transferred ); |
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361 | |
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362 | file->bytes_transferred = bytes_received; |
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363 | |
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364 | if( file->bytes_transferred >= file->file_size ) { |
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365 | dcc_finish( file ); |
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366 | return FALSE; |
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367 | } |
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368 | |
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369 | #ifndef DCC_SEND_AHEAD |
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370 | /* reschedule writer if neccessary */ |
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371 | if( file->bytes_transferred >= df->bytes_sent && |
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372 | df->watch_out == 0 && |
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373 | df->queued_bytes > 0 ) { |
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374 | df->watch_out = b_input_add( fd, GAIM_INPUT_WRITE, dcc_send_proto, df ); |
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375 | } |
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376 | #endif |
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377 | return TRUE; |
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378 | } |
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379 | |
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380 | if( revents & POLLOUT ) |
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381 | { |
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382 | struct dcc_buffer *dccb; |
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383 | int ret; |
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384 | char *msg; |
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385 | |
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386 | if( df->queued_bytes == 0 ) |
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387 | { |
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388 | /* shouldn't happen */ |
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389 | imcb_log( df->ic, "WARNING: DCC SEND: write called with empty queue" ); |
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390 | |
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391 | df->watch_out = 0; |
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392 | return FALSE; |
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393 | } |
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394 | |
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395 | /* start where we left off */ |
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396 | if( !( df->queued_buffers ) || |
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397 | !( dccb = df->queued_buffers->data ) ) |
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398 | return dcc_abort( df, "BUG in DCC SEND: queued data but no buffers" ); |
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399 | |
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400 | msg = dccb->b + df->buffer_pos; |
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401 | |
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402 | int msgsize = MIN( |
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403 | #ifndef DCC_SEND_AHEAD |
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404 | file->bytes_transferred + MAX_PACKET_SIZE - df->bytes_sent, |
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405 | #else |
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406 | max_packet_size, |
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407 | #endif |
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408 | dccb->len - df->buffer_pos ); |
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409 | |
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410 | if ( msgsize == 0 ) |
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411 | { |
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412 | df->watch_out = 0; |
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413 | return FALSE; |
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414 | } |
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415 | |
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416 | ASSERTSOCKOP( ret = send( fd, msg, msgsize, 0 ), "Sending data" ); |
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417 | |
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418 | if( ret == 0 ) |
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419 | return dcc_abort( df, "Remote end closed connection" ); |
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420 | |
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421 | df->bytes_sent += ret; |
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422 | df->queued_bytes -= ret; |
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423 | df->buffer_pos += ret; |
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424 | |
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425 | if( df->buffer_pos == dccb->len ) |
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426 | { |
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427 | df->buffer_pos = 0; |
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428 | df->queued_buffers = g_slist_remove( df->queued_buffers, dccb ); |
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429 | g_free( dccb->b ); |
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430 | g_free( dccb ); |
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431 | } |
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432 | |
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433 | if( ( df->queued_bytes < DCC_QUEUE_THRESHOLD_LOW ) && file->out_of_data ) |
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434 | file->out_of_data( file ); |
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435 | |
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436 | if( df->queued_bytes > 0 ) |
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437 | { |
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438 | /* Who knows how long the event loop cycle will take, |
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439 | * let's just try to send some more now. */ |
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440 | #ifndef DCC_SEND_AHEAD |
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441 | if( df->bytes_sent < ( file->bytes_transferred + max_packet_size ) ) |
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442 | #endif |
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443 | return dccs_send_proto( df, fd, cond ); |
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444 | } |
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445 | |
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446 | df->watch_out = 0; |
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447 | return FALSE; |
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448 | } |
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449 | |
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450 | /* Send buffer full, come back later */ |
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451 | |
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452 | return TRUE; |
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453 | } |
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454 | |
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455 | /* |
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456 | * Incoming data. Note that the buffer MUST NOT be freed by the caller! |
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457 | * We don't copy the buffer but put it in our queue. |
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458 | * |
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459 | * */ |
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460 | gboolean dccs_send_write( file_transfer_t *file, gpointer data, unsigned int data_size ) |
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461 | { |
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462 | dcc_file_transfer_t *df = file->priv; |
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463 | struct dcc_buffer *dccb = g_new0( struct dcc_buffer, 1 ); |
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464 | |
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465 | receivedchunks++; receiveddata += data_size; |
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466 | |
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467 | dccb->b = data; |
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468 | dccb->len = data_size; |
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469 | |
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470 | df->queued_buffers = g_slist_append( df->queued_buffers, dccb ); |
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471 | |
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472 | df->queued_bytes += data_size; |
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473 | |
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474 | if( ( file->status & FT_STATUS_TRANSFERING ) && |
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475 | #ifndef DCC_SEND_AHEAD |
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476 | ( file->bytes_transferred >= df->bytes_sent ) && |
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477 | #endif |
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478 | ( df->watch_out == 0 ) && |
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479 | ( df->queued_bytes > 0 ) ) |
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480 | { |
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481 | df->watch_out = b_input_add( df->fd, GAIM_INPUT_WRITE, dccs_send_proto, df ); |
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482 | } |
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483 | |
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484 | return df->queued_bytes > DCC_QUEUE_THRESHOLD_HIGH; |
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485 | } |
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486 | |
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487 | /* |
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488 | * Cleans up after a transfer. |
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489 | */ |
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490 | static void dcc_close( file_transfer_t *file ) |
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491 | { |
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492 | dcc_file_transfer_t *df = file->priv; |
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493 | |
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494 | if( file->free ) |
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495 | file->free( file ); |
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496 | |
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497 | closesocket( df->fd ); |
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498 | |
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499 | if( df->watch_in ) |
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500 | b_event_remove( df->watch_in ); |
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501 | |
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502 | if( df->watch_out ) |
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503 | b_event_remove( df->watch_out ); |
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504 | |
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505 | if( df->queued_buffers ) |
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506 | { |
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507 | struct dcc_buffer *dccb; |
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508 | GSList *gslist = df->queued_buffers; |
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509 | |
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510 | for( ; gslist ; gslist = g_slist_next( gslist ) ) |
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511 | { |
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512 | dccb = gslist->data; |
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513 | g_free( dccb->b ); |
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514 | g_free( dccb ); |
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515 | } |
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516 | g_slist_free( df->queued_buffers ); |
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517 | } |
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518 | |
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519 | df->ic->irc->file_transfers = g_slist_remove( df->ic->irc->file_transfers, file ); |
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520 | |
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521 | g_free( df ); |
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522 | g_free( file->file_name ); |
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523 | g_free( file ); |
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524 | } |
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525 | |
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526 | void dcc_finish( file_transfer_t *file ) |
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527 | { |
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528 | file->status |= FT_STATUS_FINISHED; |
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529 | |
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530 | if( file->finished ) |
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531 | file->finished( file ); |
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532 | |
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533 | dcc_close( file ); |
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534 | } |
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