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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
74
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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
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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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62
64
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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
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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
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109 tcpinfo->chantype = &cli_chan_tcplocal;
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110 tcpinfo->tcp_type = direct;
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111
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112 ret = listen_tcpfwd(tcpinfo);
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113
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114 if (ret == DROPBEAR_FAILURE) {
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115 m_free(tcpinfo);
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116 }
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117 TRACE(("leave cli_localtcp: %d", ret))
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118 return ret;
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119 }
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120 #endif /* ENABLE_CLI_LOCALTCPFWD */
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121
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122 #ifdef ENABLE_CLI_REMOTETCPFWD
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123 static void send_msg_global_request_remotetcp(int port) {
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124
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125 char* listenspec = NULL;
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126 TRACE(("enter send_msg_global_request_remotetcp"))
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127
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128 CHECKCLEARTOWRITE();
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129 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST);
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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));
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139 buf_putint(ses.writepayload, port);
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140
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141 encrypt_packet();
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142
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143 TRACE(("leave send_msg_global_request_remotetcp"))
64
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144 }
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145
505
805e557fdff7 Report errors if a remote request fails
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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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diff changeset
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
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182 void setup_remotetcp() {
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183
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184 struct TCPFwdList * iter = NULL;
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185
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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186 TRACE(("enter setup_remotetcp"))
66
38c3146aa23d Some more sanity-checking of args, and just warn and ignore OpenSSH args
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diff changeset
187
64
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diff changeset
188 if (cli_opts.remotefwds == NULL) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
189 TRACE(("cli_opts.remotefwds == NULL"))
64
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diff changeset
190 }
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diff changeset
191
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diff changeset
192 iter = cli_opts.remotefwds;
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diff changeset
193
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diff changeset
194 while (iter != NULL) {
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diff changeset
195 send_msg_global_request_remotetcp(iter->listenport);
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diff changeset
196 iter = iter->next;
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diff changeset
197 }
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 changeset
198 TRACE(("leave setup_remotetcp"))
64
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diff changeset
199 }
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diff changeset
200
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diff changeset
201 static int newtcpforwarded(struct Channel * channel) {
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diff changeset
202
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diff changeset
203 unsigned int origport;
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diff changeset
204 struct TCPFwdList * iter = NULL;
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diff changeset
205 char portstring[NI_MAXSERV];
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diff changeset
206 int sock;
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
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diff changeset
207 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED;
64
efb5e0b335cf TCP forwarding works.
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diff changeset
208
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diff changeset
209 /* We don't care what address they connected to */
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diff changeset
210 buf_eatstring(ses.payload);
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diff changeset
211
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diff changeset
212 origport = buf_getint(ses.payload);
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
213
efb5e0b335cf TCP forwarding works.
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diff changeset
214 /* Find which port corresponds */
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diff changeset
215 iter = cli_opts.remotefwds;
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diff changeset
216
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diff changeset
217 while (iter != NULL) {
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parents: 63
diff changeset
218 if (origport == iter->listenport) {
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
219 break;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
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diff changeset
220 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
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diff changeset
221 iter = iter->next;
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
222 }
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
223
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
224 if (iter == NULL) {
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
225 /* We didn't request forwarding on that port */
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parents: 63
diff changeset
226 dropbear_log(LOG_INFO, "Server send unrequested port, from port %d",
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
227 origport);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
228 goto out;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
229 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
230
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
231 snprintf(portstring, sizeof(portstring), "%d", iter->connectport);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
232 sock = connect_remote(iter->connectaddr, portstring, 1, NULL);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
233 if (sock < 0) {
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
234 TRACE(("leave newtcpdirect: sock failed"))
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 66
diff changeset
235 err = SSH_OPEN_CONNECT_FAILED;
64
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
236 goto out;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
237 }
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
238
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
239 ses.maxfd = MAX(ses.maxfd, sock);
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
240
253
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 184
diff changeset
241 /* We don't set readfd, that will get set after the connection's
64
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
242 * progress succeeds */
253
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 184
diff changeset
243 channel->writefd = sock;
64
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
244 channel->initconn = 1;
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
245
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 66
diff changeset
246 err = SSH_OPEN_IN_PROGRESS;
64
efb5e0b335cf TCP forwarding works.
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parents: 63
diff changeset
247
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
248 out:
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
249 TRACE(("leave newtcpdirect: err %d", err))
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 66
diff changeset
250 return err;
64
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
251 }
156
8c2b3506f112 Rearrange preprocessor parts so that compilation with various options
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
252 #endif /* ENABLE_CLI_REMOTETCPFWD */