Mercurial > dropbear
annotate cli-tcpfwd.c @ 821:f8b28a3de6cb
Don't say "SSH 2" any more since protocol version 1 is irrelevant
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 03 Oct 2013 23:50:04 +0800 |
parents | af304deacb4c |
children | c19acba28590 |
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(const char* listenaddr, |
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49 unsigned int listenport, |
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50 const char* remoteaddr, |
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51 unsigned int remoteport); |
62 | 52 static const struct ChanType cli_chan_tcplocal = { |
53 1, /* sepfds */ | |
54 "direct-tcpip", | |
55 NULL, | |
56 NULL, | |
64 | 57 NULL, |
62 | 58 NULL |
59 }; | |
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60 #endif |
62 | 61 |
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62 #ifdef ENABLE_CLI_LOCALTCPFWD |
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63 void setup_localtcp() { |
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64 m_list_elem *iter; |
64 | 65 int ret; |
66 | |
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67 TRACE(("enter setup_localtcp")) |
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68 |
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69 for (iter = cli_opts.localfwds->first; iter; iter = iter->next) { |
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70 struct TCPFwdEntry * fwd = (struct TCPFwdEntry*)iter->item; |
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71 ret = cli_localtcp( |
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72 fwd->listenaddr, |
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73 fwd->listenport, |
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74 fwd->connectaddr, |
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75 fwd->connectport); |
64 | 76 if (ret == DROPBEAR_FAILURE) { |
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77 dropbear_log(LOG_WARNING, "Failed local port forward %s:%d:%s:%d", |
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78 fwd->listenaddr, |
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79 fwd->listenport, |
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80 fwd->connectaddr, |
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81 fwd->connectport); |
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82 } |
64 | 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(const char* listenaddr, |
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89 unsigned int listenport, |
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90 const char* remoteaddr, |
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91 unsigned int remoteport) { |
62 | 92 |
93 struct TCPListener* tcpinfo = NULL; | |
64 | 94 int ret; |
95 | |
96 TRACE(("enter cli_localtcp: %d %s %d", listenport, remoteaddr, | |
97 remoteport)); | |
62 | 98 |
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99 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener)); |
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100 |
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101 tcpinfo->sendaddr = m_strdup(remoteaddr); |
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102 tcpinfo->sendport = remoteport; |
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103 |
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104 if (listenaddr) |
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105 { |
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106 tcpinfo->listenaddr = m_strdup(listenaddr); |
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107 } |
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108 else |
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109 { |
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110 if (opts.listen_fwd_all) { |
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111 tcpinfo->listenaddr = m_strdup(""); |
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112 } else { |
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113 tcpinfo->listenaddr = m_strdup("localhost"); |
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114 } |
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115 } |
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116 tcpinfo->listenport = listenport; |
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117 |
62 | 118 tcpinfo->chantype = &cli_chan_tcplocal; |
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119 tcpinfo->tcp_type = direct; |
62 | 120 |
121 ret = listen_tcpfwd(tcpinfo); | |
122 | |
123 if (ret == DROPBEAR_FAILURE) { | |
124 m_free(tcpinfo); | |
125 } | |
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126 TRACE(("leave cli_localtcp: %d", ret)) |
62 | 127 return ret; |
128 } | |
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129 #endif /* ENABLE_CLI_LOCALTCPFWD */ |
64 | 130 |
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131 #ifdef ENABLE_CLI_REMOTETCPFWD |
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132 static void send_msg_global_request_remotetcp(const char *addr, int port) { |
64 | 133 |
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134 TRACE(("enter send_msg_global_request_remotetcp")) |
64 | 135 |
136 CHECKCLEARTOWRITE(); | |
137 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST); | |
138 buf_putstring(ses.writepayload, "tcpip-forward", 13); | |
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139 buf_putbyte(ses.writepayload, 1); /* want_reply */ |
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140 buf_putstring(ses.writepayload, addr, strlen(addr)); |
64 | 141 buf_putint(ses.writepayload, port); |
142 | |
143 encrypt_packet(); | |
144 | |
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145 TRACE(("leave send_msg_global_request_remotetcp")) |
64 | 146 } |
147 | |
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148 /* The only global success/failure messages are for remotetcp. |
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149 * Since there isn't any identifier in these messages, we have to rely on them |
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150 * being in the same order as we sent the requests. This is the ordering |
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151 * of the cli_opts.remotefwds list. |
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152 * If the requested remote port is 0 the listen port will be |
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153 * dynamically allocated by the server and the port number will be returned |
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154 * to client and the port number reported to the user. */ |
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155 void cli_recv_msg_request_success() { |
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156 /* We just mark off that we have received the reply, |
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157 * so that we can report failure for later ones. */ |
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158 m_list_elem * iter = NULL; |
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159 for (iter = cli_opts.remotefwds->first; iter; iter = iter->next) { |
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160 struct TCPFwdEntry *fwd = (struct TCPFwdEntry*)iter->item; |
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161 if (!fwd->have_reply) { |
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162 fwd->have_reply = 1; |
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163 if (fwd->listenport == 0) { |
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164 /* The server should let us know which port was allocated if we requestd port 0 */ |
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165 int allocport = buf_getint(ses.payload); |
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166 if (allocport > 0) { |
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167 dropbear_log(LOG_INFO, "Allocated port %d for remote forward to %s:%d", |
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168 allocport, fwd->connectaddr, fwd->connectport); |
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169 } |
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170 } |
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171 return; |
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172 } |
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173 } |
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174 } |
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175 |
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176 void cli_recv_msg_request_failure() { |
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177 m_list_elem *iter; |
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178 for (iter = cli_opts.remotefwds->first; iter; iter = iter->next) { |
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179 struct TCPFwdEntry *fwd = (struct TCPFwdEntry*)iter->item; |
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180 if (!fwd->have_reply) { |
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181 fwd->have_reply = 1; |
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182 dropbear_log(LOG_WARNING, "Remote TCP forward request failed (port %d -> %s:%d)", fwd->listenport, fwd->connectaddr, fwd->connectport); |
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183 return; |
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184 } |
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185 } |
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186 } |
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187 |
64 | 188 void setup_remotetcp() { |
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189 m_list_elem *iter; |
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190 TRACE(("enter setup_remotetcp")) |
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191 |
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192 for (iter = cli_opts.remotefwds->first; iter; iter = iter->next) { |
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193 struct TCPFwdEntry *fwd = (struct TCPFwdEntry*)iter->item; |
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194 if (!fwd->listenaddr) |
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195 { |
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196 // we store the addresses so that we can compare them |
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197 // when the server sends them back |
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198 if (opts.listen_fwd_all) { |
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199 fwd->listenaddr = m_strdup(""); |
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200 } else { |
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201 fwd->listenaddr = m_strdup("localhost"); |
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202 } |
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203 } |
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204 send_msg_global_request_remotetcp(fwd->listenaddr, fwd->listenport); |
64 | 205 } |
206 | |
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207 TRACE(("leave setup_remotetcp")) |
64 | 208 } |
209 | |
210 static int newtcpforwarded(struct Channel * channel) { | |
211 | |
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212 char *origaddr = NULL; |
64 | 213 unsigned int origport; |
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214 m_list_elem * iter = NULL; |
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215 struct TCPFwdEntry *fwd; |
64 | 216 char portstring[NI_MAXSERV]; |
217 int sock; | |
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218 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |
64 | 219 |
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220 origaddr = buf_getstring(ses.payload, NULL); |
64 | 221 origport = buf_getint(ses.payload); |
222 | |
223 /* Find which port corresponds */ | |
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224 for (iter = cli_opts.remotefwds->first; iter; iter = iter->next) { |
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225 fwd = (struct TCPFwdEntry*)iter->item; |
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226 if (origport == fwd->listenport |
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227 && (strcmp(origaddr, fwd->listenaddr) == 0)) { |
64 | 228 break; |
229 } | |
230 } | |
231 | |
232 if (iter == NULL) { | |
233 /* We didn't request forwarding on that port */ | |
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234 cleantext(origaddr); |
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235 dropbear_log(LOG_INFO, "Server sent unrequested forward from \"%s:%d\"", |
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236 origaddr, origport); |
64 | 237 goto out; |
238 } | |
239 | |
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240 snprintf(portstring, sizeof(portstring), "%d", fwd->connectport); |
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241 sock = connect_remote(fwd->connectaddr, portstring, 1, NULL); |
64 | 242 if (sock < 0) { |
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243 TRACE(("leave newtcpdirect: sock failed")) |
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244 err = SSH_OPEN_CONNECT_FAILED; |
64 | 245 goto out; |
246 } | |
247 | |
248 ses.maxfd = MAX(ses.maxfd, sock); | |
249 | |
253
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250 /* We don't set readfd, that will get set after the connection's |
64 | 251 * progress succeeds */ |
253
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252 channel->writefd = sock; |
64 | 253 channel->initconn = 1; |
254 | |
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255 err = SSH_OPEN_IN_PROGRESS; |
64 | 256 |
257 out: | |
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258 m_free(origaddr); |
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259 TRACE(("leave newtcpdirect: err %d", err)) |
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260 return err; |
64 | 261 } |
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262 #endif /* ENABLE_CLI_REMOTETCPFWD */ |