Mercurial > dropbear
annotate common-channel.c @ 717:74deece07742
update text about authorized_keys options
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 21 Mar 2013 23:11:16 +0800 |
parents | abd99ecd7ec2 |
children | 4a274f47eabd |
rev | line source |
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1 /* |
107 | 2 * Dropbear SSH |
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3 * |
107 | 4 * Copyright (c) 2002-2004 Matt Johnston |
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5 * All rights reserved. |
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6 * |
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 * of this software and associated documentation files (the "Software"), to deal |
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9 * in the Software without restriction, including without limitation the rights |
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 * copies of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be included in |
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15 * all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 * SOFTWARE. */ |
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24 |
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25 /* Handle the multiplexed channels, such as sessions, x11, agent connections */ |
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26 |
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27 #include "includes.h" |
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28 #include "session.h" |
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29 #include "packet.h" |
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30 #include "ssh.h" |
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31 #include "buffer.h" |
107 | 32 #include "circbuffer.h" |
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33 #include "dbutil.h" |
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34 #include "channel.h" |
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35 #include "ssh.h" |
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36 #include "listener.h" |
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37 #include "runopts.h" |
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38 |
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39 static void send_msg_channel_open_failure(unsigned int remotechan, int reason, |
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40 const unsigned char *text, const unsigned char *lang); |
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41 static void send_msg_channel_open_confirmation(struct Channel* channel, |
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42 unsigned int recvwindow, |
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43 unsigned int recvmaxpacket); |
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44 static void writechannel(struct Channel* channel, int fd, circbuffer *cbuf); |
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45 static void send_msg_channel_window_adjust(struct Channel *channel, |
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46 unsigned int incr); |
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47 static void send_msg_channel_data(struct Channel *channel, int isextended); |
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48 static void send_msg_channel_eof(struct Channel *channel); |
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49 static void send_msg_channel_close(struct Channel *channel); |
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50 static void remove_channel(struct Channel *channel); |
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51 static void check_in_progress(struct Channel *channel); |
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52 static unsigned int write_pending(struct Channel * channel); |
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53 static void check_close(struct Channel *channel); |
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54 static void close_chan_fd(struct Channel *channel, int fd, int how); |
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55 |
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56 #define FD_UNINIT (-2) |
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57 #define FD_CLOSED (-1) |
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58 |
375 | 59 #define ERRFD_IS_READ(channel) ((channel)->extrabuf == NULL) |
60 #define ERRFD_IS_WRITE(channel) (!ERRFD_IS_READ(channel)) | |
61 | |
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62 /* Initialise all the channels */ |
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63 void chaninitialise(const struct ChanType *chantypes[]) { |
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64 |
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65 /* may as well create space for a single channel */ |
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66 ses.channels = (struct Channel**)m_malloc(sizeof(struct Channel*)); |
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67 ses.chansize = 1; |
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68 ses.channels[0] = NULL; |
37 | 69 ses.chancount = 0; |
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70 |
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71 ses.chantypes = chantypes; |
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72 |
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73 #ifdef USING_LISTENERS |
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74 listeners_initialise(); |
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75 #endif |
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76 |
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77 } |
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78 |
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79 /* Clean up channels, freeing allocated memory */ |
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80 void chancleanup() { |
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81 |
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82 unsigned int i; |
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83 |
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84 TRACE(("enter chancleanup")) |
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85 for (i = 0; i < ses.chansize; i++) { |
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86 if (ses.channels[i] != NULL) { |
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87 TRACE(("channel %d closing", i)) |
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88 remove_channel(ses.channels[i]); |
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89 } |
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90 } |
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91 m_free(ses.channels); |
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92 TRACE(("leave chancleanup")) |
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93 } |
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94 |
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95 static void |
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96 chan_initwritebuf(struct Channel *channel) |
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97 { |
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98 dropbear_assert(channel->writebuf->size == 0 && channel->recvwindow == 0); |
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99 cbuf_free(channel->writebuf); |
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100 channel->writebuf = cbuf_new(opts.recv_window); |
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101 channel->recvwindow = opts.recv_window; |
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102 } |
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103 |
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104 /* Create a new channel entry, send a reply confirm or failure */ |
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105 /* If remotechan, transwindow and transmaxpacket are not know (for a new |
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106 * outgoing connection, with them to be filled on confirmation), they should |
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107 * all be set to 0 */ |
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108 static struct Channel* newchannel(unsigned int remotechan, |
7 | 109 const struct ChanType *type, |
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110 unsigned int transwindow, unsigned int transmaxpacket) { |
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111 |
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112 struct Channel * newchan; |
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113 unsigned int i, j; |
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114 |
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115 TRACE(("enter newchannel")) |
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116 |
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117 /* first see if we can use existing channels */ |
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118 for (i = 0; i < ses.chansize; i++) { |
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119 if (ses.channels[i] == NULL) { |
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120 break; |
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121 } |
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122 } |
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123 |
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124 /* otherwise extend the list */ |
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125 if (i == ses.chansize) { |
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126 if (ses.chansize >= MAX_CHANNELS) { |
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127 TRACE(("leave newchannel: max chans reached")) |
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128 return NULL; |
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129 } |
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130 |
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131 /* extend the channels */ |
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132 ses.channels = (struct Channel**)m_realloc(ses.channels, |
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133 (ses.chansize+CHAN_EXTEND_SIZE)*sizeof(struct Channel*)); |
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134 |
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135 ses.chansize += CHAN_EXTEND_SIZE; |
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136 |
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137 /* set the new channels to null */ |
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138 for (j = i; j < ses.chansize; j++) { |
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139 ses.channels[j] = NULL; |
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140 } |
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141 |
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142 } |
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143 |
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144 newchan = (struct Channel*)m_malloc(sizeof(struct Channel)); |
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145 newchan->type = type; |
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146 newchan->index = i; |
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147 newchan->sent_close = newchan->recv_close = 0; |
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148 newchan->sent_eof = newchan->recv_eof = 0; |
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149 newchan->close_handler_done = 0; |
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150 |
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151 newchan->remotechan = remotechan; |
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152 newchan->transwindow = transwindow; |
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153 newchan->transmaxpacket = transmaxpacket; |
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154 |
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155 newchan->typedata = NULL; |
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156 newchan->writefd = FD_UNINIT; |
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157 newchan->readfd = FD_UNINIT; |
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158 newchan->errfd = FD_CLOSED; /* this isn't always set to start with */ |
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159 newchan->initconn = 0; |
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160 newchan->await_open = 0; |
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161 newchan->flushing = 0; |
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162 |
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163 newchan->writebuf = cbuf_new(0); /* resized later by chan_initwritebuf */ |
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164 newchan->recvwindow = 0; |
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165 |
107 | 166 newchan->extrabuf = NULL; /* The user code can set it up */ |
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167 newchan->recvdonelen = 0; |
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168 newchan->recvmaxpacket = RECV_MAX_PAYLOAD_LEN; |
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169 |
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170 ses.channels[i] = newchan; |
37 | 171 ses.chancount++; |
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172 |
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173 TRACE(("leave newchannel")) |
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174 |
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175 return newchan; |
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176 } |
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177 |
179
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178 /* Returns the channel structure corresponding to the channel in the current |
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179 * data packet (ses.payload must be positioned appropriately). |
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180 * A valid channel is always returns, it will fail fatally with an unknown |
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181 * channel */ |
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182 static struct Channel* getchannel_msg(const char* kind) { |
179
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183 |
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184 unsigned int chan; |
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185 |
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186 chan = buf_getint(ses.payload); |
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187 if (chan >= ses.chansize || ses.channels[chan] == NULL) { |
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188 if (kind) { |
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189 dropbear_exit("%s for unknown channel %d", kind, chan); |
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190 } else { |
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191 dropbear_exit("Unknown channel %d", chan); |
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192 } |
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193 } |
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194 return ses.channels[chan]; |
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195 } |
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196 |
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197 struct Channel* getchannel() { |
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198 return getchannel_msg(NULL); |
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199 } |
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200 |
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201 /* Iterate through the channels, performing IO if available */ |
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202 void channelio(fd_set *readfds, fd_set *writefds) { |
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203 |
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204 struct Channel *channel; |
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205 unsigned int i; |
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206 |
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207 /* foreach channel */ |
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208 for (i = 0; i < ses.chansize; i++) { |
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209 |
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210 channel = ses.channels[i]; |
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211 if (channel == NULL) { |
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212 /* only process in-use channels */ |
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213 continue; |
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214 } |
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215 |
253
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216 /* read data and send it over the wire */ |
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217 if (channel->readfd >= 0 && FD_ISSET(channel->readfd, readfds)) { |
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218 TRACE(("send normal readfd")) |
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219 send_msg_channel_data(channel, 0); |
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220 } |
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221 |
253
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222 /* read stderr data and send it over the wire */ |
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223 if (ERRFD_IS_READ(channel) && channel->errfd >= 0 |
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224 && FD_ISSET(channel->errfd, readfds)) { |
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225 TRACE(("send normal errfd")) |
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226 send_msg_channel_data(channel, 1); |
395
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227 } |
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228 |
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229 /* write to program/pipe stdin */ |
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230 if (channel->writefd >= 0 && FD_ISSET(channel->writefd, writefds)) { |
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231 if (channel->initconn) { |
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232 /* XXX should this go somewhere cleaner? */ |
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233 check_in_progress(channel); |
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234 continue; /* Important not to use the channel after |
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235 check_in_progress(), as it may be NULL */ |
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236 } |
253
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237 writechannel(channel, channel->writefd, channel->writebuf); |
108
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238 } |
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239 |
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240 /* stderr for client mode */ |
375 | 241 if (ERRFD_IS_WRITE(channel) |
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242 && channel->errfd >= 0 && FD_ISSET(channel->errfd, writefds)) { |
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243 writechannel(channel, channel->errfd, channel->extrabuf); |
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244 } |
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245 |
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246 /* handle any channel closing etc */ |
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247 check_close(channel); |
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248 |
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249 } |
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250 |
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251 /* Listeners such as TCP, X11, agent-auth */ |
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252 #ifdef USING_LISTENERS |
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253 handle_listeners(readfds); |
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254 #endif |
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255 } |
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256 |
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257 |
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258 /* Returns true if there is data remaining to be written to stdin or |
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259 * stderr of a channel's endpoint. */ |
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260 static unsigned int write_pending(struct Channel * channel) { |
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261 |
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262 if (channel->writefd >= 0 && cbuf_getused(channel->writebuf) > 0) { |
363
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263 return 1; |
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264 } else if (channel->errfd >= 0 && channel->extrabuf && |
375 | 265 cbuf_getused(channel->extrabuf) > 0) { |
363
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266 return 1; |
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267 } |
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268 return 0; |
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269 } |
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270 |
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271 |
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272 /* EOF/close handling */ |
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273 static void check_close(struct Channel *channel) { |
467
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274 int close_allowed = 0; |
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275 |
359
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276 TRACE(("check_close: writefd %d, readfd %d, errfd %d, sent_close %d, recv_close %d", |
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277 channel->writefd, channel->readfd, |
359
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278 channel->errfd, channel->sent_close, channel->recv_close)) |
375 | 279 TRACE(("writebuf size %d extrabuf size %d", |
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280 channel->writebuf ? cbuf_getused(channel->writebuf) : 0, |
375 | 281 channel->extrabuf ? cbuf_getused(channel->extrabuf) : 0)) |
109
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282 |
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283 if (!channel->flushing |
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284 && !channel->close_handler_done |
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285 && channel->type->check_close |
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286 && channel->type->check_close(channel)) |
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287 { |
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288 channel->flushing = 1; |
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289 } |
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290 |
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291 /* if a type-specific check_close is defined we will only exit |
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292 once that has been triggered. this is only used for a server "session" |
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293 channel, to ensure that the shell has exited (and the exit status |
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294 retrieved) before we close things up. */ |
467
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295 if (!channel->type->check_close |
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296 || channel->close_handler_done |
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297 || channel->type->check_close(channel)) { |
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298 close_allowed = 1; |
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299 } |
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300 |
467
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301 if (channel->recv_close && !write_pending(channel) && close_allowed) { |
416
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302 if (!channel->sent_close) { |
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303 TRACE(("Sending MSG_CHANNEL_CLOSE in response to same.")) |
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304 send_msg_channel_close(channel); |
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305 } |
362
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306 remove_channel(channel); |
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307 return; |
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308 } |
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309 |
364 | 310 if (channel->recv_eof && !write_pending(channel)) { |
311 close_chan_fd(channel, channel->writefd, SHUT_WR); | |
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312 } |
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313 |
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314 /* Special handling for flushing read data after an exit. We |
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315 read regardless of whether the select FD was set, |
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316 and if there isn't data available, the channel will get closed. */ |
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317 if (channel->flushing) { |
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318 TRACE(("might send data, flushing")) |
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319 if (channel->readfd >= 0 && channel->transwindow > 0) { |
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320 TRACE(("send data readfd")) |
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321 send_msg_channel_data(channel, 0); |
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322 } |
439
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323 if (ERRFD_IS_READ(channel) && channel->errfd >= 0 |
416
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324 && channel->transwindow > 0) { |
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325 TRACE(("send data errfd")) |
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326 send_msg_channel_data(channel, 1); |
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327 } |
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328 } |
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329 |
375 | 330 /* If we're not going to send any more data, send EOF */ |
359
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331 if (!channel->sent_eof |
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332 && channel->readfd == FD_CLOSED |
375 | 333 && (ERRFD_IS_WRITE(channel) || channel->errfd == FD_CLOSED)) { |
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334 send_msg_channel_eof(channel); |
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335 } |
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336 |
375 | 337 /* And if we can't receive any more data from them either, close up */ |
467
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338 if (channel->readfd == FD_CLOSED |
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339 && (ERRFD_IS_WRITE(channel) || channel->errfd == FD_CLOSED) |
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340 && !channel->sent_close |
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341 && close_allowed |
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342 && !write_pending(channel)) { |
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343 TRACE(("sending close, readfd is closed")) |
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344 send_msg_channel_close(channel); |
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345 } |
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346 } |
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347 |
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348 /* Check whether a deferred (EINPROGRESS) connect() was successful, and |
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349 * if so, set up the channel properly. Otherwise, the channel is cleaned up, so |
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350 * it is important that the channel reference isn't used after a call to this |
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351 * function */ |
359
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352 static void check_in_progress(struct Channel *channel) { |
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353 |
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354 int val; |
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355 socklen_t vallen = sizeof(val); |
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356 |
359
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357 TRACE(("enter check_in_progress")) |
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358 |
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359 if (getsockopt(channel->writefd, SOL_SOCKET, SO_ERROR, &val, &vallen) |
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360 || val != 0) { |
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361 send_msg_channel_open_failure(channel->remotechan, |
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362 SSH_OPEN_CONNECT_FAILED, "", ""); |
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363 close(channel->writefd); |
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364 remove_channel(channel); |
359
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365 TRACE(("leave check_in_progress: fail")) |
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366 } else { |
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367 chan_initwritebuf(channel); |
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368 send_msg_channel_open_confirmation(channel, channel->recvwindow, |
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369 channel->recvmaxpacket); |
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370 channel->readfd = channel->writefd; |
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371 channel->initconn = 0; |
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372 TRACE(("leave check_in_progress: success")) |
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373 } |
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374 } |
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375 |
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376 |
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377 /* Send the close message and set the channel as closed */ |
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378 static void send_msg_channel_close(struct Channel *channel) { |
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379 |
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380 TRACE(("enter send_msg_channel_close %p", channel)) |
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381 if (channel->type->closehandler |
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382 && !channel->close_handler_done) { |
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383 channel->type->closehandler(channel); |
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384 channel->close_handler_done = 1; |
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385 } |
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386 |
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387 CHECKCLEARTOWRITE(); |
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388 |
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389 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_CLOSE); |
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390 buf_putint(ses.writepayload, channel->remotechan); |
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391 |
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392 encrypt_packet(); |
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393 |
359
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394 channel->sent_eof = 1; |
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395 channel->sent_close = 1; |
416
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396 close_chan_fd(channel, channel->readfd, SHUT_RD); |
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397 close_chan_fd(channel, channel->errfd, SHUT_RDWR); |
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398 close_chan_fd(channel, channel->writefd, SHUT_WR); |
165
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399 TRACE(("leave send_msg_channel_close")) |
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400 } |
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401 |
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402 /* call this when trans/eof channels are closed */ |
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403 static void send_msg_channel_eof(struct Channel *channel) { |
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404 |
165
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405 TRACE(("enter send_msg_channel_eof")) |
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406 CHECKCLEARTOWRITE(); |
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407 |
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408 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_EOF); |
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409 buf_putint(ses.writepayload, channel->remotechan); |
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410 |
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411 encrypt_packet(); |
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412 |
359
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413 channel->sent_eof = 1; |
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414 |
165
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415 TRACE(("leave send_msg_channel_eof")) |
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416 } |
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417 |
107 | 418 /* Called to write data out to the local side of the channel. |
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419 * Only called when we know we can write to a channel, writes as much as |
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420 * possible */ |
108
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421 static void writechannel(struct Channel* channel, int fd, circbuffer *cbuf) { |
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422 |
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423 int len, maxlen; |
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424 |
375 | 425 TRACE(("enter writechannel fd %d", fd)) |
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426 |
107 | 427 maxlen = cbuf_readlen(cbuf); |
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428 |
107 | 429 /* Write the data out */ |
108
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430 len = write(fd, cbuf_readptr(cbuf, maxlen), maxlen); |
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431 if (len <= 0) { |
375 | 432 TRACE(("errno %d len %d", errno, len)) |
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433 if (len < 0 && errno != EINTR) { |
363
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434 close_chan_fd(channel, fd, SHUT_WR); |
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435 } |
165
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436 TRACE(("leave writechannel: len <= 0")) |
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437 return; |
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438 } |
375 | 439 TRACE(("writechannel wrote %d", len)) |
107 | 440 |
441 cbuf_incrread(cbuf, len); | |
108
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442 channel->recvdonelen += len; |
107 | 443 |
444 /* Window adjust handling */ | |
108
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445 if (channel->recvdonelen >= RECV_WINDOWEXTEND) { |
107 | 446 /* Set it back to max window */ |
108
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447 send_msg_channel_window_adjust(channel, channel->recvdonelen); |
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448 channel->recvwindow += channel->recvdonelen; |
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449 channel->recvdonelen = 0; |
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450 } |
108
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451 |
449
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|
452 dropbear_assert(channel->recvwindow <= opts.recv_window); |
709
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453 dropbear_assert(channel->recvwindow <= cbuf_getavail(channel->writebuf)); |
241
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454 dropbear_assert(channel->extrabuf == NULL || |
108
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455 channel->recvwindow <= cbuf_getavail(channel->extrabuf)); |
107 | 456 |
165
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457 TRACE(("leave writechannel")) |
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458 } |
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459 |
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460 /* Set the file descriptors for the main select in session.c |
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461 * This avoid channels which don't have any window available, are closed, etc*/ |
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462 void setchannelfds(fd_set *readfds, fd_set *writefds) { |
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463 |
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464 unsigned int i; |
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465 struct Channel * channel; |
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466 |
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467 for (i = 0; i < ses.chansize; i++) { |
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468 |
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469 channel = ses.channels[i]; |
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470 if (channel == NULL) { |
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471 continue; |
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472 } |
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473 |
107 | 474 /* Stuff to put over the wire */ |
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475 if (channel->transwindow > 0) { |
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476 |
253
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477 if (channel->readfd >= 0) { |
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478 FD_SET(channel->readfd, readfds); |
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479 } |
107 | 480 |
375 | 481 if (ERRFD_IS_READ(channel) && channel->errfd >= 0) { |
253
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482 FD_SET(channel->errfd, readfds); |
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483 } |
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484 } |
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485 |
397
2908122e9eed
disapproval of revision '1250b8af44b62d8f4fe0f8d9fc7e7a1cc34e7e1c'
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486 /* Stuff from the wire */ |
707
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Fix memory leak when direct TCP connections time out on connection.
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|
487 if (channel->initconn |
564e7f87ecc3
Fix memory leak when direct TCP connections time out on connection.
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673
diff
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|
488 ||(channel->writefd >= 0 && cbuf_getused(channel->writebuf) > 0)) { |
253
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489 FD_SET(channel->writefd, writefds); |
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490 } |
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491 |
433
c216212001fc
Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
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423
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|
492 if (ERRFD_IS_WRITE(channel) && channel->errfd >= 0 |
707
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|
493 && cbuf_getused(channel->extrabuf) > 0) { |
253
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494 FD_SET(channel->errfd, writefds); |
107 | 495 } |
496 | |
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497 } /* foreach channel */ |
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498 |
9
7f77962de998
- Reworked non-channel fd handling to listener.c
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|
499 #ifdef USING_LISTENERS |
253
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500 set_listener_fds(readfds); |
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501 #endif |
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502 |
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503 } |
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504 |
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505 /* handle the channel EOF event, by closing the channel filedescriptor. The |
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506 * channel isn't closed yet, it is left until the incoming (from the program |
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507 * etc) FD is also EOF */ |
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508 void recv_msg_channel_eof() { |
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509 |
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510 struct Channel * channel; |
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511 |
165
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512 TRACE(("enter recv_msg_channel_eof")) |
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513 |
362
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514 channel = getchannel_msg("EOF"); |
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515 |
359
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516 channel->recv_eof = 1; |
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517 |
362
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
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518 check_close(channel); |
165
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519 TRACE(("leave recv_msg_channel_eof")) |
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520 } |
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521 |
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522 |
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523 /* Handle channel closure(), respond in kind and close the channels */ |
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524 void recv_msg_channel_close() { |
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525 |
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526 struct Channel * channel; |
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527 |
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528 TRACE(("enter recv_msg_channel_close")) |
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529 |
362
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530 channel = getchannel_msg("Close"); |
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531 |
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532 channel->recv_eof = 1; |
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533 channel->recv_close = 1; |
4
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534 |
362
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535 check_close(channel); |
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536 TRACE(("leave recv_msg_channel_close")) |
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537 } |
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538 |
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539 /* Remove a channel entry, this is only executed after both sides have sent |
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540 * channel close */ |
359
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541 static void remove_channel(struct Channel * channel) { |
4
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542 |
359
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543 TRACE(("enter remove_channel")) |
165
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544 TRACE(("channel index is %d", channel->index)) |
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545 |
709
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546 cbuf_free(channel->writebuf); |
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|
547 channel->writebuf = NULL; |
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548 |
107 | 549 if (channel->extrabuf) { |
550 cbuf_free(channel->extrabuf); | |
551 channel->extrabuf = NULL; | |
552 } | |
553 | |
554 | |
4
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555 /* close the FDs in case they haven't been done |
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556 * yet (they might have been shutdown etc) */ |
375 | 557 TRACE(("CLOSE writefd %d", channel->writefd)) |
253
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558 close(channel->writefd); |
375 | 559 TRACE(("CLOSE readfd %d", channel->readfd)) |
253
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560 close(channel->readfd); |
375 | 561 TRACE(("CLOSE errfd %d", channel->errfd)) |
109
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108
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562 close(channel->errfd); |
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108
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563 |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
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|
564 channel->typedata = NULL; |
4
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565 |
707
564e7f87ecc3
Fix memory leak when direct TCP connections time out on connection.
Matt Johnston <matt@ucc.asn.au>
parents:
673
diff
changeset
|
566 ses.channels[channel->index] = NULL; |
564e7f87ecc3
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Matt Johnston <matt@ucc.asn.au>
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673
diff
changeset
|
567 m_free(channel); |
564e7f87ecc3
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diff
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|
568 ses.chancount--; |
4
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569 |
359
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570 TRACE(("leave remove_channel")) |
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571 } |
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572 |
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573 /* Handle channel specific requests, passing off to corresponding handlers |
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574 * such as chansession or x11fwd */ |
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575 void recv_msg_channel_request() { |
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576 |
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577 struct Channel *channel; |
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578 |
179
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579 channel = getchannel(); |
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580 |
652
17962b2a6b8f
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|
581 TRACE(("enter recv_msg_channel_request %p", channel)) |
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|
582 |
495
cd02449b709c
Don't send anything in response to a SSH_MSG_CHANNEL_REQUEST if we have
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583 if (channel->sent_close) { |
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584 TRACE(("leave recv_msg_channel_request: already closed channel")) |
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585 return; |
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diff
changeset
|
586 } |
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587 |
652
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Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
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|
588 if (channel->type->reqhandler |
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|
589 && !channel->close_handler_done) { |
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590 channel->type->reqhandler(channel); |
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591 } else { |
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592 send_msg_channel_failure(channel); |
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593 } |
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|
594 |
165
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595 TRACE(("leave recv_msg_channel_request")) |
4
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596 |
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597 } |
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598 |
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599 /* Reads data from the server's program/shell/etc, and puts it in a |
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|
600 * channel_data packet to send. |
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601 * chan is the remote channel, isextended is 0 if it is normal data, 1 |
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|
602 * if it is extended data. if it is extended, then the type is in |
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603 * exttype */ |
363
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parents:
362
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604 static void send_msg_channel_data(struct Channel *channel, int isextended) { |
4
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605 |
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|
606 int len; |
362
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607 size_t maxlen, size_pos; |
4
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|
608 int fd; |
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|
609 |
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|
610 CHECKCLEARTOWRITE(); |
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|
611 |
416
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
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diff
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|
612 TRACE(("enter send_msg_channel_data")) |
359
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613 dropbear_assert(!channel->sent_close); |
4
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|
614 |
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|
615 if (isextended) { |
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|
616 fd = channel->errfd; |
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|
617 } else { |
253
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|
618 fd = channel->readfd; |
4
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619 } |
375 | 620 TRACE(("enter send_msg_channel_data isextended %d fd %d", isextended, fd)) |
241
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* use own assertions which should get logged properly
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621 dropbear_assert(fd >= 0); |
4
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622 |
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623 maxlen = MIN(channel->transwindow, channel->transmaxpacket); |
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624 /* -(1+4+4) is SSH_MSG_CHANNEL_DATA, channel number, string length, and |
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|
625 * exttype if is extended */ |
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|
626 maxlen = MIN(maxlen, |
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|
627 ses.writepayload->size - 1 - 4 - 4 - (isextended ? 4 : 0)); |
362
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Rearranged some more bits, marked some areas that need work.
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|
628 TRACE(("maxlen %d", maxlen)) |
4
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|
629 if (maxlen == 0) { |
165
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|
630 TRACE(("leave send_msg_channel_data: no window")) |
4
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|
631 return; |
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|
632 } |
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|
633 |
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|
634 buf_putbyte(ses.writepayload, |
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|
635 isextended ? SSH_MSG_CHANNEL_EXTENDED_DATA : SSH_MSG_CHANNEL_DATA); |
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|
636 buf_putint(ses.writepayload, channel->remotechan); |
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|
637 if (isextended) { |
363
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|
638 buf_putint(ses.writepayload, SSH_EXTENDED_DATA_STDERR); |
4
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639 } |
362
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|
640 /* a dummy size first ...*/ |
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|
641 size_pos = ses.writepayload->pos; |
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642 buf_putint(ses.writepayload, 0); |
4
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|
643 |
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644 /* read the data */ |
362
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645 len = read(fd, buf_getwriteptr(ses.writepayload, maxlen), maxlen); |
4
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|
646 if (len <= 0) { |
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|
647 if (len == 0 || errno != EINTR) { |
416
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Improve behaviour when flushing out after a process has exited.
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415
diff
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|
648 /* This will also get hit in the case of EAGAIN. The only |
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Improve behaviour when flushing out after a process has exited.
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|
649 time we expect to receive EAGAIN is when we're flushing a FD, |
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Improve behaviour when flushing out after a process has exited.
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650 in which case it can be treated the same as EOF */ |
363
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|
651 close_chan_fd(channel, fd, SHUT_RD); |
4
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652 } |
362
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|
653 ses.writepayload->len = ses.writepayload->pos = 0; |
423
b2b67cfcd66e
- Fix bug in child-exit handling where the wrong pid was being matched.
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416
diff
changeset
|
654 TRACE(("leave send_msg_channel_data: len %d read err %d or EOF for fd %d", |
b2b67cfcd66e
- Fix bug in child-exit handling where the wrong pid was being matched.
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diff
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|
655 len, errno, fd)) |
4
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|
656 return; |
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|
657 } |
673
c519b78b6d1a
- Don't sent SSH_MSG_UNIMPLEMENTED if we don't have ENABLE_SVR_REMOTETCPFWD
Matt Johnston <matt@ucc.asn.au>
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652
diff
changeset
|
658 |
c519b78b6d1a
- Don't sent SSH_MSG_UNIMPLEMENTED if we don't have ENABLE_SVR_REMOTETCPFWD
Matt Johnston <matt@ucc.asn.au>
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diff
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|
659 TRACE(("send_msg_channel_data: len %d fd %d", len, fd)) |
362
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
Matt Johnston <matt@ucc.asn.au>
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359
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|
660 buf_incrwritepos(ses.writepayload, len); |
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
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|
661 /* ... real size here */ |
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
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359
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|
662 buf_setpos(ses.writepayload, size_pos); |
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
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|
663 buf_putint(ses.writepayload, len); |
4
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664 |
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|
665 channel->transwindow -= len; |
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|
666 |
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|
667 encrypt_packet(); |
416
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
Matt Johnston <matt@ucc.asn.au>
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415
diff
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|
668 |
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
Matt Johnston <matt@ucc.asn.au>
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415
diff
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|
669 /* If we receive less data than we requested when flushing, we've |
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
Matt Johnston <matt@ucc.asn.au>
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415
diff
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|
670 reached the equivalent of EOF */ |
433
c216212001fc
Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
Matt Johnston <matt@ucc.asn.au>
parents:
423
diff
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|
671 if (channel->flushing && len < (ssize_t)maxlen) |
416
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
Matt Johnston <matt@ucc.asn.au>
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415
diff
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|
672 { |
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
Matt Johnston <matt@ucc.asn.au>
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415
diff
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|
673 TRACE(("closing from channel, flushing out.")) |
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
Matt Johnston <matt@ucc.asn.au>
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415
diff
changeset
|
674 close_chan_fd(channel, fd, SHUT_RD); |
a01c0c8e543a
Improve behaviour when flushing out after a process has exited.
Matt Johnston <matt@ucc.asn.au>
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415
diff
changeset
|
675 } |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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156
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|
676 TRACE(("leave send_msg_channel_data")) |
4
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|
677 } |
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|
678 |
107 | 679 /* We receive channel data */ |
4
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|
680 void recv_msg_channel_data() { |
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681 |
107 | 682 struct Channel *channel; |
4
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683 |
179
161557a9dde8
* fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
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|
684 channel = getchannel(); |
4
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685 |
253
84925eceeb13
* rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
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243
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|
686 common_recv_msg_channel_data(channel, channel->writefd, channel->writebuf); |
107 | 687 } |
688 | |
689 /* Shared for data and stderr data - when we receive data, put it in a buffer | |
690 * for writing to the local file descriptor */ | |
691 void common_recv_msg_channel_data(struct Channel *channel, int fd, | |
692 circbuffer * cbuf) { | |
693 | |
694 unsigned int datalen; | |
695 unsigned int maxdata; | |
696 unsigned int buflen; | |
697 unsigned int len; | |
698 | |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
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|
699 TRACE(("enter recv_msg_channel_data")) |
107 | 700 |
359
78518751cb82
just shuffle some variables names about, a brief comment
Matt Johnston <matt@ucc.asn.au>
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332
diff
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|
701 if (channel->recv_eof) { |
594
a98a2138364a
Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents:
513
diff
changeset
|
702 dropbear_exit("Received data after eof"); |
4
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|
703 } |
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changeset
|
704 |
707
564e7f87ecc3
Fix memory leak when direct TCP connections time out on connection.
Matt Johnston <matt@ucc.asn.au>
parents:
673
diff
changeset
|
705 if (fd < 0 || !cbuf) { |
365
49fcc9875045
Remove accidentally removed block (making sure to close the channel).
Matt Johnston <matt@ucc.asn.au>
parents:
364
diff
changeset
|
706 /* If we have encountered failed write, the far side might still |
49fcc9875045
Remove accidentally removed block (making sure to close the channel).
Matt Johnston <matt@ucc.asn.au>
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364
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|
707 * be sending data without having yet received our close notification. |
49fcc9875045
Remove accidentally removed block (making sure to close the channel).
Matt Johnston <matt@ucc.asn.au>
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364
diff
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|
708 * We just drop the data. */ |
49fcc9875045
Remove accidentally removed block (making sure to close the channel).
Matt Johnston <matt@ucc.asn.au>
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364
diff
changeset
|
709 return; |
4
fe6bca95afa7
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|
710 } |
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|
711 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
712 datalen = buf_getint(ses.payload); |
365
49fcc9875045
Remove accidentally removed block (making sure to close the channel).
Matt Johnston <matt@ucc.asn.au>
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|
713 TRACE(("length %d", datalen)) |
107 | 714 |
715 maxdata = cbuf_getavail(cbuf); | |
108
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
107
diff
changeset
|
716 |
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
107
diff
changeset
|
717 /* Whilst the spec says we "MAY ignore data past the end" this could |
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
107
diff
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|
718 * lead to corrupted file transfers etc (chunks missed etc). It's better to |
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
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107
diff
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|
719 * just die horribly */ |
4
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|
720 if (datalen > maxdata) { |
108
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
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107
diff
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|
721 dropbear_exit("Oversized packet"); |
4
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|
722 } |
fe6bca95afa7
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|
723 |
107 | 724 /* We may have to run throught twice, if the buffer wraps around. Can't |
725 * just "leave it for next time" like with writechannel, since this | |
726 * is payload data */ | |
727 len = datalen; | |
728 while (len > 0) { | |
729 buflen = cbuf_writelen(cbuf); | |
730 buflen = MIN(buflen, len); | |
731 | |
732 memcpy(cbuf_writeptr(cbuf, buflen), | |
733 buf_getptr(ses.payload, buflen), buflen); | |
734 cbuf_incrwrite(cbuf, buflen); | |
108
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
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107
diff
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|
735 buf_incrpos(ses.payload, buflen); |
107 | 736 len -= buflen; |
737 } | |
4
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738 |
241
c5d3ef11155f
* use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
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221
diff
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|
739 dropbear_assert(channel->recvwindow >= datalen); |
4
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Matt Johnston <matt@ucc.asn.au>
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|
740 channel->recvwindow -= datalen; |
449
3e6c536bc023
Add -W <windowsize> argument and document it.
Matt Johnston <matt@ucc.asn.au>
parents:
448
diff
changeset
|
741 dropbear_assert(channel->recvwindow <= opts.recv_window); |
4
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|
742 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
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diff
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|
743 TRACE(("leave recv_msg_channel_data")) |
4
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|
744 } |
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|
745 |
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changeset
|
746 /* Increment the outgoing data window for a channel - the remote end limits |
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changeset
|
747 * the amount of data which may be transmitted, this window is decremented |
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|
748 * as data is sent, and incremented upon receiving window-adjust messages */ |
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|
749 void recv_msg_channel_window_adjust() { |
fe6bca95afa7
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|
750 |
fe6bca95afa7
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|
751 struct Channel * channel; |
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|
752 unsigned int incr; |
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diff
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|
753 |
179
161557a9dde8
* fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
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165
diff
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|
754 channel = getchannel(); |
4
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|
755 |
fe6bca95afa7
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|
756 incr = buf_getint(ses.payload); |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
757 TRACE(("received window increment %d", incr)) |
448
9c61e7af0156
Rearrange the channel buffer sizes into three neat use-editable values in
Matt Johnston <matt@ucc.asn.au>
parents:
439
diff
changeset
|
758 incr = MIN(incr, TRANS_MAX_WIN_INCR); |
4
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Matt Johnston <matt@ucc.asn.au>
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changeset
|
759 |
fe6bca95afa7
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parents:
diff
changeset
|
760 channel->transwindow += incr; |
448
9c61e7af0156
Rearrange the channel buffer sizes into three neat use-editable values in
Matt Johnston <matt@ucc.asn.au>
parents:
439
diff
changeset
|
761 channel->transwindow = MIN(channel->transwindow, TRANS_MAX_WINDOW); |
4
fe6bca95afa7
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changeset
|
762 |
fe6bca95afa7
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parents:
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changeset
|
763 } |
fe6bca95afa7
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parents:
diff
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|
764 |
fe6bca95afa7
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parents:
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changeset
|
765 /* Increment the incoming data window for a channel, and let the remote |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
766 * end know */ |
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Matt Johnston <matt@ucc.asn.au>
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changeset
|
767 static void send_msg_channel_window_adjust(struct Channel* channel, |
fe6bca95afa7
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changeset
|
768 unsigned int incr) { |
fe6bca95afa7
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|
769 |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
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156
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|
770 TRACE(("sending window adjust %d", incr)) |
4
fe6bca95afa7
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|
771 CHECKCLEARTOWRITE(); |
fe6bca95afa7
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changeset
|
772 |
fe6bca95afa7
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changeset
|
773 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_WINDOW_ADJUST); |
fe6bca95afa7
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diff
changeset
|
774 buf_putint(ses.writepayload, channel->remotechan); |
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changeset
|
775 buf_putint(ses.writepayload, incr); |
fe6bca95afa7
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parents:
diff
changeset
|
776 |
fe6bca95afa7
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changeset
|
777 encrypt_packet(); |
fe6bca95afa7
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|
778 } |
fe6bca95afa7
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changeset
|
779 |
fe6bca95afa7
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changeset
|
780 /* Handle a new channel request, performing any channel-type-specific setup */ |
fe6bca95afa7
Makefile.in contains updated files required
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changeset
|
781 void recv_msg_channel_open() { |
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changeset
|
782 |
fe6bca95afa7
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changeset
|
783 unsigned char *type; |
fe6bca95afa7
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changeset
|
784 unsigned int typelen; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
785 unsigned int remotechan, transwindow, transmaxpacket; |
fe6bca95afa7
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changeset
|
786 struct Channel *channel; |
7 | 787 const struct ChanType **cp; |
6
ab00ef513e97
Sorted out the first channel init issues.
Matt Johnston <matt@ucc.asn.au>
parents:
4
diff
changeset
|
788 const struct ChanType *chantype; |
4
fe6bca95afa7
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changeset
|
789 unsigned int errtype = SSH_OPEN_UNKNOWN_CHANNEL_TYPE; |
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parents:
diff
changeset
|
790 int ret; |
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changeset
|
791 |
fe6bca95afa7
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parents:
diff
changeset
|
792 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents:
156
diff
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|
793 TRACE(("enter recv_msg_channel_open")) |
4
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parents:
diff
changeset
|
794 |
fe6bca95afa7
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parents:
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changeset
|
795 /* get the packet contents */ |
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parents:
diff
changeset
|
796 type = buf_getstring(ses.payload, &typelen); |
fe6bca95afa7
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parents:
diff
changeset
|
797 |
fe6bca95afa7
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parents:
diff
changeset
|
798 remotechan = buf_getint(ses.payload); |
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parents:
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changeset
|
799 transwindow = buf_getint(ses.payload); |
448
9c61e7af0156
Rearrange the channel buffer sizes into three neat use-editable values in
Matt Johnston <matt@ucc.asn.au>
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439
diff
changeset
|
800 transwindow = MIN(transwindow, TRANS_MAX_WINDOW); |
4
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changeset
|
801 transmaxpacket = buf_getint(ses.payload); |
448
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Rearrange the channel buffer sizes into three neat use-editable values in
Matt Johnston <matt@ucc.asn.au>
parents:
439
diff
changeset
|
802 transmaxpacket = MIN(transmaxpacket, TRANS_MAX_PAYLOAD_LEN); |
4
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parents:
diff
changeset
|
803 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
804 /* figure what type of packet it is */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
805 if (typelen > MAX_NAME_LEN) { |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
806 goto failure; |
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parents:
diff
changeset
|
807 } |
fe6bca95afa7
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parents:
diff
changeset
|
808 |
7 | 809 /* Get the channel type. Client and server style invokation will set up a |
810 * different list for ses.chantypes at startup. We just iterate through | |
811 * this list and find the matching name */ | |
812 for (cp = &ses.chantypes[0], chantype = (*cp); | |
813 chantype != NULL; | |
814 cp++, chantype = (*cp)) { | |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
815 if (strcmp(type, chantype->name) == 0) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
816 break; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
817 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
818 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
819 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
820 if (chantype == NULL) { |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
821 TRACE(("No matching type for '%s'", type)) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
822 goto failure; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
823 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
824 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
825 TRACE(("matched type '%s'", type)) |
7 | 826 |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
827 /* create the channel */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
828 channel = newchannel(remotechan, chantype, transwindow, transmaxpacket); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
829 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
830 if (channel == NULL) { |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
831 TRACE(("newchannel returned NULL")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
832 goto failure; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
833 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
834 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
835 if (channel->type->inithandler) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
836 ret = channel->type->inithandler(channel); |
362
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
Matt Johnston <matt@ucc.asn.au>
parents:
359
diff
changeset
|
837 if (ret == SSH_OPEN_IN_PROGRESS) { |
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
Matt Johnston <matt@ucc.asn.au>
parents:
359
diff
changeset
|
838 /* We'll send the confirmation later */ |
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
Matt Johnston <matt@ucc.asn.au>
parents:
359
diff
changeset
|
839 goto cleanup; |
1c7bf9cec6c8
Rearranged some more bits, marked some areas that need work.
Matt Johnston <matt@ucc.asn.au>
parents:
359
diff
changeset
|
840 } |
6
ab00ef513e97
Sorted out the first channel init issues.
Matt Johnston <matt@ucc.asn.au>
parents:
4
diff
changeset
|
841 if (ret > 0) { |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
842 errtype = ret; |
707
564e7f87ecc3
Fix memory leak when direct TCP connections time out on connection.
Matt Johnston <matt@ucc.asn.au>
parents:
673
diff
changeset
|
843 remove_channel(channel); |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
844 TRACE(("inithandler returned failure %d", ret)) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
845 goto failure; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
846 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
847 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
848 |
707
564e7f87ecc3
Fix memory leak when direct TCP connections time out on connection.
Matt Johnston <matt@ucc.asn.au>
parents:
673
diff
changeset
|
849 chan_initwritebuf(channel); |
564e7f87ecc3
Fix memory leak when direct TCP connections time out on connection.
Matt Johnston <matt@ucc.asn.au>
parents:
673
diff
changeset
|
850 |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
851 /* success */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
852 send_msg_channel_open_confirmation(channel, channel->recvwindow, |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
853 channel->recvmaxpacket); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
854 goto cleanup; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
855 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
856 failure: |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
857 TRACE(("recv_msg_channel_open failure")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
858 send_msg_channel_open_failure(remotechan, errtype, "", ""); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
859 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
860 cleanup: |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
861 m_free(type); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
862 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
863 TRACE(("leave recv_msg_channel_open")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
864 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
865 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
866 /* Send a failure message */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
867 void send_msg_channel_failure(struct Channel *channel) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
868 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
869 TRACE(("enter send_msg_channel_failure")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
870 CHECKCLEARTOWRITE(); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
871 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
872 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_FAILURE); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
873 buf_putint(ses.writepayload, channel->remotechan); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
874 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
875 encrypt_packet(); |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
876 TRACE(("leave send_msg_channel_failure")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
877 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
878 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
879 /* Send a success message */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
880 void send_msg_channel_success(struct Channel *channel) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
881 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
882 TRACE(("enter send_msg_channel_success")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
883 CHECKCLEARTOWRITE(); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
884 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
885 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_SUCCESS); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
886 buf_putint(ses.writepayload, channel->remotechan); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
887 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
888 encrypt_packet(); |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
889 TRACE(("leave send_msg_channel_success")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
890 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
891 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
892 /* Send a channel open failure message, with a corresponding reason |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
893 * code (usually resource shortage or unknown chan type) */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
894 static void send_msg_channel_open_failure(unsigned int remotechan, |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
895 int reason, const unsigned char *text, const unsigned char *lang) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
896 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
897 TRACE(("enter send_msg_channel_open_failure")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
898 CHECKCLEARTOWRITE(); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
899 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
900 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_OPEN_FAILURE); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
901 buf_putint(ses.writepayload, remotechan); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
902 buf_putint(ses.writepayload, reason); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
903 buf_putstring(ses.writepayload, text, strlen((char*)text)); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
904 buf_putstring(ses.writepayload, lang, strlen((char*)lang)); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
905 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
906 encrypt_packet(); |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
907 TRACE(("leave send_msg_channel_open_failure")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
908 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
909 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
910 /* Confirm a channel open, and let the remote end know what number we've |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
911 * allocated and the receive parameters */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
912 static void send_msg_channel_open_confirmation(struct Channel* channel, |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
913 unsigned int recvwindow, |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
914 unsigned int recvmaxpacket) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
915 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
916 TRACE(("enter send_msg_channel_open_confirmation")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
917 CHECKCLEARTOWRITE(); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
918 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
919 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
920 buf_putint(ses.writepayload, channel->remotechan); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
921 buf_putint(ses.writepayload, channel->index); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
922 buf_putint(ses.writepayload, recvwindow); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
923 buf_putint(ses.writepayload, recvmaxpacket); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
924 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
925 encrypt_packet(); |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
156
diff
changeset
|
926 TRACE(("leave send_msg_channel_open_confirmation")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
927 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
928 |
363
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
929 /* close a fd, how is SHUT_RD or SHUT_WR */ |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
930 static void close_chan_fd(struct Channel *channel, int fd, int how) { |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
931 |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
932 int closein = 0, closeout = 0; |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
933 |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
934 if (channel->type->sepfds) { |
375 | 935 TRACE(("SHUTDOWN(%d, %d)", fd, how)) |
363
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
936 shutdown(fd, how); |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
937 if (how == 0) { |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
938 closeout = 1; |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
939 } else { |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
940 closein = 1; |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
changeset
|
941 } |
6ba2894ec8d5
Rearranged (and hopefully simplified) channel close/eof handling
Matt Johnston <matt@ucc.asn.au>
parents:
362
diff
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942 } else { |
375 | 943 TRACE(("CLOSE some fd %d", fd)) |
363
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944 close(fd); |
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945 closein = closeout = 1; |
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946 } |
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947 |
375 | 948 if (closeout && (fd == channel->readfd)) { |
363
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949 channel->readfd = FD_CLOSED; |
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950 } |
375 | 951 if (closeout && ERRFD_IS_READ(channel) && (fd == channel->errfd)) { |
363
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952 channel->errfd = FD_CLOSED; |
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953 } |
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954 |
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955 if (closein && fd == channel->writefd) { |
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956 channel->writefd = FD_CLOSED; |
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957 } |
375 | 958 if (closein && ERRFD_IS_WRITE(channel) && (fd == channel->errfd)) { |
363
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959 channel->errfd = FD_CLOSED; |
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960 } |
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961 |
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962 /* if we called shutdown on it and all references are gone, then we |
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963 * need to close() it to stop it lingering */ |
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964 if (channel->type->sepfds && channel->readfd == FD_CLOSED |
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965 && channel->writefd == FD_CLOSED && channel->errfd == FD_CLOSED) { |
375 | 966 TRACE(("CLOSE (finally) of %d", fd)) |
363
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967 close(fd); |
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968 } |
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969 } |
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970 |
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971 |
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972 #if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT) |
4
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973 /* Create a new channel, and start the open request. This is intended |
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974 * for X11, agent, tcp forwarding, and should be filled with channel-specific |
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975 * options, with the calling function calling encrypt_packet() after |
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976 * completion. It is mandatory for the caller to encrypt_packet() if |
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977 * DROPBEAR_SUCCESS is returned */ |
9
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978 int send_msg_channel_open_init(int fd, const struct ChanType *type) { |
4
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979 |
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980 struct Channel* chan; |
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981 |
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982 TRACE(("enter send_msg_channel_open_init()")) |
4
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983 chan = newchannel(0, type, 0, 0); |
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984 if (!chan) { |
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985 TRACE(("leave send_msg_channel_open_init() - FAILED in newchannel()")) |
4
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986 return DROPBEAR_FAILURE; |
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987 } |
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988 |
707
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989 /* Outbound opened channels don't make use of in-progress connections, |
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990 * we can set it up straight away */ |
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991 chan_initwritebuf(chan); |
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992 |
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993 /* set fd non-blocking */ |
109
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
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994 setnonblocking(fd); |
4
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995 |
253
84925eceeb13
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996 chan->writefd = chan->readfd = fd; |
4
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997 ses.maxfd = MAX(ses.maxfd, fd); |
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998 |
243
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999 chan->await_open = 1; |
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1000 |
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1001 /* now open the channel connection */ |
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1002 CHECKCLEARTOWRITE(); |
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1003 |
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1004 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_OPEN); |
9
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1005 buf_putstring(ses.writepayload, type->name, strlen(type->name)); |
4
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1006 buf_putint(ses.writepayload, chan->index); |
449
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1007 buf_putint(ses.writepayload, opts.recv_window); |
448
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1008 buf_putint(ses.writepayload, RECV_MAX_PAYLOAD_LEN); |
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1009 |
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1010 TRACE(("leave send_msg_channel_open_init()")) |
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1011 return DROPBEAR_SUCCESS; |
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1012 } |
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1013 |
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1014 /* Confirmation that our channel open request (for forwardings) was |
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1015 * successful*/ |
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1016 void recv_msg_channel_open_confirmation() { |
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1017 |
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1018 struct Channel * channel; |
37 | 1019 int ret; |
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1020 |
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1021 TRACE(("enter recv_msg_channel_open_confirmation")) |
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1022 |
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1023 channel = getchannel(); |
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1024 |
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1025 if (!channel->await_open) { |
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1026 dropbear_exit("Unexpected channel reply"); |
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1027 } |
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1028 channel->await_open = 0; |
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1029 |
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1030 channel->remotechan = buf_getint(ses.payload); |
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1031 channel->transwindow = buf_getint(ses.payload); |
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1032 channel->transmaxpacket = buf_getint(ses.payload); |
13
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1033 |
187
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1034 TRACE(("new chan remote %d local %d", |
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1035 channel->remotechan, channel->index)) |
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1036 |
37 | 1037 /* Run the inithandler callback */ |
1038 if (channel->type->inithandler) { | |
1039 ret = channel->type->inithandler(channel); | |
1040 if (ret > 0) { | |
359
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1041 remove_channel(channel); |
165
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1042 TRACE(("inithandler returned failure %d", ret)) |
37 | 1043 } |
1044 } | |
1045 | |
13
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1046 |
165
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1047 TRACE(("leave recv_msg_channel_open_confirmation")) |
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1048 } |
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1049 |
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1050 /* Notification that our channel open request failed */ |
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|
1051 void recv_msg_channel_open_failure() { |
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1052 |
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1053 struct Channel * channel; |
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1054 |
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1055 channel = getchannel(); |
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1056 |
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1057 if (!channel->await_open) { |
594
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1058 dropbear_exit("Unexpected channel reply"); |
243
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1059 } |
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1060 channel->await_open = 0; |
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1061 |
359
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1062 remove_channel(channel); |
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1063 } |
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1064 #endif /* USING_LISTENERS */ |