annotate cli-tcpfwd.c @ 221:a4b93a2ed879

* close a file descriptor after we've shutdown() both sides, to avoid a leak
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Jul 2005 15:04:06 +0000
parents ca55377e4f7e
children 84925eceeb13
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
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25 #include "includes.h"
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26 #include "options.h"
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27 #include "dbutil.h"
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28 #include "tcpfwd.h"
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29 #include "channel.h"
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30 #include "runopts.h"
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31 #include "session.h"
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32 #include "ssh.h"
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33
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34 #ifdef ENABLE_CLI_REMOTETCPFWD
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35 static int newtcpforwarded(struct Channel * channel);
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36
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37 const struct ChanType cli_chan_tcpremote = {
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38 1, /* sepfds */
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39 "forwarded-tcpip",
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40 newtcpforwarded,
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41 NULL,
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42 NULL,
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43 NULL
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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);
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50 static const struct ChanType cli_chan_tcplocal = {
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51 1, /* sepfds */
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52 "direct-tcpip",
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53 NULL,
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54 NULL,
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55 NULL,
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56 NULL
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57 };
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58 #endif
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59
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60 #ifdef ENABLE_CLI_LOCALTCPFWD
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61 void setup_localtcp() {
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63 int ret;
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64
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65 TRACE(("enter setup_localtcp"))
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66
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67 if (cli_opts.localfwds == NULL) {
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68 TRACE(("cli_opts.localfwds == NULL"))
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69 }
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70
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71 while (cli_opts.localfwds != NULL) {
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72 ret = cli_localtcp(cli_opts.localfwds->listenport,
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73 cli_opts.localfwds->connectaddr,
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74 cli_opts.localfwds->connectport);
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75 if (ret == DROPBEAR_FAILURE) {
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76 dropbear_log(LOG_WARNING, "Failed local port forward %d:%s:%d",
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77 cli_opts.localfwds->listenport,
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78 cli_opts.localfwds->connectaddr,
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79 cli_opts.localfwds->connectport);
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80 }
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81
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82 cli_opts.localfwds = cli_opts.localfwds->next;
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83 }
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84 TRACE(("leave setup_localtcp"))
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85
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86 }
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87
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88 static int cli_localtcp(unsigned int listenport, const char* remoteaddr,
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89 unsigned int remoteport) {
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90
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91 struct TCPListener* tcpinfo = NULL;
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92 int ret;
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93
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94 TRACE(("enter cli_localtcp: %d %s %d", listenport, remoteaddr,
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95 remoteport));
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96
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97 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener));
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98 tcpinfo->sendaddr = m_strdup(remoteaddr);
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99 tcpinfo->sendport = remoteport;
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100 tcpinfo->listenport = listenport;
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101 tcpinfo->chantype = &cli_chan_tcplocal;
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102
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103 ret = listen_tcpfwd(tcpinfo);
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104
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105 if (ret == DROPBEAR_FAILURE) {
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106 m_free(tcpinfo);
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107 }
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108 TRACE(("leave cli_localtcp: %d", ret))
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109 return ret;
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110 }
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111 #endif /* ENABLE_CLI_LOCALTCPFWD */
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112
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113 #ifdef ENABLE_CLI_REMOTETCPFWD
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114 static void send_msg_global_request_remotetcp(int port) {
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115
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116 TRACE(("enter send_msg_global_request_remotetcp"))
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117
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118 CHECKCLEARTOWRITE();
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119 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST);
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120 buf_putstring(ses.writepayload, "tcpip-forward", 13);
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121 buf_putbyte(ses.writepayload, 0);
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122 buf_putstring(ses.writepayload, "0.0.0.0", 7); /* TODO: IPv6? */
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123 buf_putint(ses.writepayload, port);
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124
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125 encrypt_packet();
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126
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127 TRACE(("leave send_msg_global_request_remotetcp"))
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128 }
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129
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130 void setup_remotetcp() {
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131
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132 struct TCPFwdList * iter = NULL;
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133
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134 TRACE(("enter setup_remotetcp"))
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135
64
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136 if (cli_opts.remotefwds == NULL) {
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137 TRACE(("cli_opts.remotefwds == NULL"))
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138 }
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139
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140 iter = cli_opts.remotefwds;
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141
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142 while (iter != NULL) {
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143 send_msg_global_request_remotetcp(iter->listenport);
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144 iter = iter->next;
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145 }
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146 TRACE(("leave setup_remotetcp"))
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147 }
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148
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149 static int newtcpforwarded(struct Channel * channel) {
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150
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151 unsigned int origport;
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152 struct TCPFwdList * iter = NULL;
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153 char portstring[NI_MAXSERV];
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154 int sock;
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155 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED;
64
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156
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157 /* We don't care what address they connected to */
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158 buf_eatstring(ses.payload);
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159
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160 origport = buf_getint(ses.payload);
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161
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162 /* Find which port corresponds */
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163 iter = cli_opts.remotefwds;
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164
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165 while (iter != NULL) {
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166 if (origport == iter->listenport) {
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167 break;
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168 }
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169 iter = iter->next;
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170 }
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171
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172 if (iter == NULL) {
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173 /* We didn't request forwarding on that port */
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174 dropbear_log(LOG_INFO, "Server send unrequested port, from port %d",
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175 origport);
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176 goto out;
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177 }
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178
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179 snprintf(portstring, sizeof(portstring), "%d", iter->connectport);
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180 sock = connect_remote(iter->connectaddr, portstring, 1, NULL);
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181 if (sock < 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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182 TRACE(("leave newtcpdirect: sock failed"))
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183 err = SSH_OPEN_CONNECT_FAILED;
64
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184 goto out;
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185 }
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186
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187 ses.maxfd = MAX(ses.maxfd, sock);
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188
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189 /* Note that infd is actually the "outgoing" direction on the
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190 * tcp connection, vice versa for outfd.
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191 * We don't set outfd, that will get set after the connection's
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192 * progress succeeds */
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193 channel->infd = sock;
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194 channel->initconn = 1;
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195
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196 err = SSH_OPEN_IN_PROGRESS;
64
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197
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198 out:
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
199 TRACE(("leave newtcpdirect: err %d", err))
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200 return err;
64
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201 }
156
8c2b3506f112 Rearrange preprocessor parts so that compilation with various options
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202 #endif /* ENABLE_CLI_REMOTETCPFWD */