Mercurial > dropbear
annotate cli-tcpfwd.c @ 553:8711f20b89ab
- For uclinux, only cleanup on exit for the main process. This avoids
trashing the state when a failing child exits.
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 09 Jul 2009 16:01:30 +0000 |
| parents | 805e557fdff7 |
| children | c3f2ec71e3d4 69e98c45db7c |
| rev | line source |
|---|---|
|
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1 /* |
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2 * Dropbear SSH |
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3 * |
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4 * Copyright (c) 2002,2003 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 |
| 62 | 25 #include "includes.h" |
| 26 #include "options.h" | |
| 64 | 27 #include "dbutil.h" |
| 28 #include "tcpfwd.h" | |
| 62 | 29 #include "channel.h" |
| 64 | 30 #include "runopts.h" |
| 31 #include "session.h" | |
| 32 #include "ssh.h" | |
| 62 | 33 |
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34 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 64 | 35 static int newtcpforwarded(struct Channel * channel); |
| 36 | |
| 37 const struct ChanType cli_chan_tcpremote = { | |
| 38 1, /* sepfds */ | |
| 39 "forwarded-tcpip", | |
| 40 newtcpforwarded, | |
| 41 NULL, | |
| 42 NULL, | |
| 43 NULL | |
| 44 }; | |
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45 #endif |
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46 |
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47 #ifdef ENABLE_CLI_LOCALTCPFWD |
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48 static int cli_localtcp(unsigned int listenport, const char* remoteaddr, |
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49 unsigned int remoteport); |
| 62 | 50 static const struct ChanType cli_chan_tcplocal = { |
| 51 1, /* sepfds */ | |
| 52 "direct-tcpip", | |
| 53 NULL, | |
| 54 NULL, | |
| 64 | 55 NULL, |
| 62 | 56 NULL |
| 57 }; | |
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58 #endif |
| 62 | 59 |
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60 #ifdef ENABLE_CLI_LOCALTCPFWD |
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61 void setup_localtcp() { |
| 62 | 62 |
| 64 | 63 int ret; |
| 64 | |
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65 TRACE(("enter setup_localtcp")) |
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66 |
| 64 | 67 if (cli_opts.localfwds == NULL) { |
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68 TRACE(("cli_opts.localfwds == NULL")) |
| 64 | 69 } |
| 70 | |
| 71 while (cli_opts.localfwds != NULL) { | |
| 72 ret = cli_localtcp(cli_opts.localfwds->listenport, | |
| 73 cli_opts.localfwds->connectaddr, | |
| 74 cli_opts.localfwds->connectport); | |
| 75 if (ret == DROPBEAR_FAILURE) { | |
| 76 dropbear_log(LOG_WARNING, "Failed local port forward %d:%s:%d", | |
| 77 cli_opts.localfwds->listenport, | |
| 78 cli_opts.localfwds->connectaddr, | |
| 79 cli_opts.localfwds->connectport); | |
| 80 } | |
| 81 | |
| 82 cli_opts.localfwds = cli_opts.localfwds->next; | |
| 83 } | |
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84 TRACE(("leave setup_localtcp")) |
| 62 | 85 |
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86 } |
| 62 | 87 |
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88 static int cli_localtcp(unsigned int listenport, const char* remoteaddr, |
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89 unsigned int remoteport) { |
| 62 | 90 |
| 91 struct TCPListener* tcpinfo = NULL; | |
| 64 | 92 int ret; |
| 93 | |
| 94 TRACE(("enter cli_localtcp: %d %s %d", listenport, remoteaddr, | |
| 95 remoteport)); | |
| 62 | 96 |
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97 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener)); |
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98 |
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99 tcpinfo->sendaddr = m_strdup(remoteaddr); |
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100 tcpinfo->sendport = remoteport; |
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101 |
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102 if (opts.listen_fwd_all) { |
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103 tcpinfo->listenaddr = m_strdup(""); |
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104 } else { |
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105 tcpinfo->listenaddr = m_strdup("localhost"); |
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106 } |
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107 tcpinfo->listenport = listenport; |
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108 |
| 62 | 109 tcpinfo->chantype = &cli_chan_tcplocal; |
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110 tcpinfo->tcp_type = direct; |
| 62 | 111 |
| 112 ret = listen_tcpfwd(tcpinfo); | |
| 113 | |
| 114 if (ret == DROPBEAR_FAILURE) { | |
| 115 m_free(tcpinfo); | |
| 116 } | |
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117 TRACE(("leave cli_localtcp: %d", ret)) |
| 62 | 118 return ret; |
| 119 } | |
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120 #endif /* ENABLE_CLI_LOCALTCPFWD */ |
| 64 | 121 |
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122 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 64 | 123 static void send_msg_global_request_remotetcp(int port) { |
| 124 | |
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125 char* listenspec = NULL; |
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126 TRACE(("enter send_msg_global_request_remotetcp")) |
| 64 | 127 |
| 128 CHECKCLEARTOWRITE(); | |
| 129 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST); | |
| 130 buf_putstring(ses.writepayload, "tcpip-forward", 13); | |
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131 buf_putbyte(ses.writepayload, 1); /* want_reply */ |
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132 if (opts.listen_fwd_all) { |
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133 listenspec = ""; |
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134 } else { |
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135 listenspec = "localhost"; |
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136 } |
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137 /* TODO: IPv6? */; |
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138 buf_putstring(ses.writepayload, listenspec, strlen(listenspec)); |
| 64 | 139 buf_putint(ses.writepayload, port); |
| 140 | |
| 141 encrypt_packet(); | |
| 142 | |
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143 TRACE(("leave send_msg_global_request_remotetcp")) |
| 64 | 144 } |
| 145 | |
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146 /* The only global success/failure messages are for remotetcp. |
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147 * Since there isn't any identifier in these messages, we have to rely on them |
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148 * being in the same order as we sent the requests. This is the ordering |
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149 * of the cli_opts.remotefwds list */ |
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150 void cli_recv_msg_request_success() { |
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151 |
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152 /* Nothing in the packet. We just mark off that we have received the reply, |
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153 * so that we can report failure for later ones. */ |
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154 struct TCPFwdList * iter = NULL; |
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155 |
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156 iter = cli_opts.remotefwds; |
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157 while (iter != NULL) { |
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158 if (!iter->have_reply) |
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159 { |
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160 iter->have_reply = 1; |
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161 return; |
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162 } |
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163 iter = iter->next; |
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164 } |
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165 } |
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166 |
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167 void cli_recv_msg_request_failure() { |
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168 struct TCPFwdList * iter = NULL; |
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169 |
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170 iter = cli_opts.remotefwds; |
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171 while (iter != NULL) { |
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172 if (!iter->have_reply) |
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173 { |
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174 iter->have_reply = 1; |
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175 dropbear_log(LOG_WARNING, "Remote TCP forward request failed (port %d -> %s:%d)", iter->listenport, iter->connectaddr, iter->connectport); |
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176 return; |
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177 } |
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178 iter = iter->next; |
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179 } |
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180 } |
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181 |
| 64 | 182 void setup_remotetcp() { |
| 183 | |
| 184 struct TCPFwdList * iter = NULL; | |
| 185 | |
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186 TRACE(("enter setup_remotetcp")) |
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187 |
| 64 | 188 if (cli_opts.remotefwds == NULL) { |
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189 TRACE(("cli_opts.remotefwds == NULL")) |
| 64 | 190 } |
| 191 | |
| 192 iter = cli_opts.remotefwds; | |
| 193 | |
| 194 while (iter != NULL) { | |
| 195 send_msg_global_request_remotetcp(iter->listenport); | |
| 196 iter = iter->next; | |
| 197 } | |
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198 TRACE(("leave setup_remotetcp")) |
| 64 | 199 } |
| 200 | |
| 201 static int newtcpforwarded(struct Channel * channel) { | |
| 202 | |
| 203 unsigned int origport; | |
| 204 struct TCPFwdList * iter = NULL; | |
| 205 char portstring[NI_MAXSERV]; | |
| 206 int sock; | |
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207 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |
| 64 | 208 |
| 209 /* We don't care what address they connected to */ | |
| 210 buf_eatstring(ses.payload); | |
| 211 | |
| 212 origport = buf_getint(ses.payload); | |
| 213 | |
| 214 /* Find which port corresponds */ | |
| 215 iter = cli_opts.remotefwds; | |
| 216 | |
| 217 while (iter != NULL) { | |
| 218 if (origport == iter->listenport) { | |
| 219 break; | |
| 220 } | |
| 221 iter = iter->next; | |
| 222 } | |
| 223 | |
| 224 if (iter == NULL) { | |
| 225 /* We didn't request forwarding on that port */ | |
| 226 dropbear_log(LOG_INFO, "Server send unrequested port, from port %d", | |
| 227 origport); | |
| 228 goto out; | |
| 229 } | |
| 230 | |
| 231 snprintf(portstring, sizeof(portstring), "%d", iter->connectport); | |
| 232 sock = connect_remote(iter->connectaddr, portstring, 1, NULL); | |
| 233 if (sock < 0) { | |
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234 TRACE(("leave newtcpdirect: sock failed")) |
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235 err = SSH_OPEN_CONNECT_FAILED; |
| 64 | 236 goto out; |
| 237 } | |
| 238 | |
| 239 ses.maxfd = MAX(ses.maxfd, sock); | |
| 240 | |
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241 /* We don't set readfd, that will get set after the connection's |
| 64 | 242 * progress succeeds */ |
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243 channel->writefd = sock; |
| 64 | 244 channel->initconn = 1; |
| 245 | |
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246 err = SSH_OPEN_IN_PROGRESS; |
| 64 | 247 |
| 248 out: | |
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249 TRACE(("leave newtcpdirect: err %d", err)) |
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250 return err; |
| 64 | 251 } |
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252 #endif /* ENABLE_CLI_REMOTETCPFWD */ |