annotate cli-tcpfwd.c @ 95:b855bf63766c

Don't try to remove non-eixtant listeners
author Matt Johnston <matt@ucc.asn.au>
date Wed, 18 Aug 2004 16:31:05 +0000
parents e3adf4cf5465
children 10f4d3319780
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
64
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34 static int cli_localtcp(unsigned int listenport, const char* remoteaddr,
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35 unsigned int remoteport);
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36 static int newtcpforwarded(struct Channel * channel);
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37
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38 const struct ChanType cli_chan_tcpremote = {
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39 1, /* sepfds */
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40 "forwarded-tcpip",
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41 newtcpforwarded,
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42 NULL,
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43 NULL,
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44 NULL
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45 };
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46 static const struct ChanType cli_chan_tcplocal = {
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47 1, /* sepfds */
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48 "direct-tcpip",
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49 NULL,
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50 NULL,
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51 NULL,
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52 NULL
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53 };
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54
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55 void setup_localtcp() {
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56
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57 int ret;
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58
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59 TRACE(("enter setup_localtcp"));
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60
64
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61 if (cli_opts.localfwds == NULL) {
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62 TRACE(("cli_opts.localfwds == NULL"));
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63 }
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64
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65 while (cli_opts.localfwds != NULL) {
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66 ret = cli_localtcp(cli_opts.localfwds->listenport,
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67 cli_opts.localfwds->connectaddr,
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68 cli_opts.localfwds->connectport);
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69 if (ret == DROPBEAR_FAILURE) {
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70 dropbear_log(LOG_WARNING, "Failed local port forward %d:%s:%d",
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71 cli_opts.localfwds->listenport,
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72 cli_opts.localfwds->connectaddr,
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73 cli_opts.localfwds->connectport);
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74 }
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75
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76 cli_opts.localfwds = cli_opts.localfwds->next;
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77 }
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78 TRACE(("leave setup_localtcp"));
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80 }
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81
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82 static int cli_localtcp(unsigned int listenport, const char* remoteaddr,
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83 unsigned int remoteport) {
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84
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85 struct TCPListener* tcpinfo = NULL;
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86 int ret;
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87
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88 TRACE(("enter cli_localtcp: %d %s %d", listenport, remoteaddr,
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89 remoteport));
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90
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91 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener*));
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92 tcpinfo->sendaddr = remoteaddr;
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93 tcpinfo->sendport = remoteport;
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94 tcpinfo->listenport = listenport;
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95 tcpinfo->chantype = &cli_chan_tcplocal;
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96
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97 ret = listen_tcpfwd(tcpinfo);
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98
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99 if (ret == DROPBEAR_FAILURE) {
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100 m_free(tcpinfo);
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101 }
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102 TRACE(("leave cli_localtcp: %d", ret));
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103 return ret;
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104 }
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105
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106 static void send_msg_global_request_remotetcp(int port) {
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107
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108 TRACE(("enter send_msg_global_request_remotetcp"));
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109
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110 CHECKCLEARTOWRITE();
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111 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST);
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112 buf_putstring(ses.writepayload, "tcpip-forward", 13);
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113 buf_putbyte(ses.writepayload, 0);
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114 buf_putstring(ses.writepayload, "0.0.0.0", 7); /* TODO: IPv6? */
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115 buf_putint(ses.writepayload, port);
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116
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117 encrypt_packet();
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118
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119 TRACE(("leave send_msg_global_request_remotetcp"));
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120 }
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121
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122 void setup_remotetcp() {
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123
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124 struct TCPFwdList * iter = NULL;
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125
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126 TRACE(("enter setup_remotetcp"));
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127
64
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128 if (cli_opts.remotefwds == NULL) {
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129 TRACE(("cli_opts.remotefwds == NULL"));
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130 }
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131
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132 iter = cli_opts.remotefwds;
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133
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134 while (iter != NULL) {
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135 send_msg_global_request_remotetcp(iter->listenport);
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136 iter = iter->next;
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137 }
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138 TRACE(("leave setup_remotetcp"));
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139 }
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140
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141 static int newtcpforwarded(struct Channel * channel) {
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142
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143 unsigned int origport;
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144 struct TCPFwdList * iter = NULL;
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145 char portstring[NI_MAXSERV];
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146 int sock;
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147 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED;
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148
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149 /* We don't care what address they connected to */
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150 buf_eatstring(ses.payload);
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151
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152 origport = buf_getint(ses.payload);
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153
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diff changeset
154 /* Find which port corresponds */
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diff changeset
155 iter = cli_opts.remotefwds;
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diff changeset
156
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diff changeset
157 while (iter != NULL) {
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diff changeset
158 if (origport == iter->listenport) {
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diff changeset
159 break;
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diff changeset
160 }
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diff changeset
161 iter = iter->next;
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diff changeset
162 }
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diff changeset
163
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diff changeset
164 if (iter == NULL) {
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diff changeset
165 /* We didn't request forwarding on that port */
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diff changeset
166 dropbear_log(LOG_INFO, "Server send unrequested port, from port %d",
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diff changeset
167 origport);
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diff changeset
168 goto out;
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diff changeset
169 }
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diff changeset
170
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diff changeset
171 snprintf(portstring, sizeof(portstring), "%d", iter->connectport);
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diff changeset
172 sock = connect_remote(iter->connectaddr, portstring, 1, NULL);
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diff changeset
173 if (sock < 0) {
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diff changeset
174 TRACE(("leave newtcpdirect: sock failed"));
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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diff changeset
175 err = SSH_OPEN_CONNECT_FAILED;
64
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diff changeset
176 goto out;
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parents: 63
diff changeset
177 }
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diff changeset
178
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diff changeset
179 ses.maxfd = MAX(ses.maxfd, sock);
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diff changeset
180
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diff changeset
181 /* Note that infd is actually the "outgoing" direction on the
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diff changeset
182 * tcp connection, vice versa for outfd.
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diff changeset
183 * We don't set outfd, that will get set after the connection's
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diff changeset
184 * progress succeeds */
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diff changeset
185 channel->infd = sock;
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diff changeset
186 channel->initconn = 1;
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diff changeset
187
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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diff changeset
188 err = SSH_OPEN_IN_PROGRESS;
64
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parents: 63
diff changeset
189
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diff changeset
190 out:
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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parents: 66
diff changeset
191 TRACE(("leave newtcpdirect: err %d", err));
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parents: 66
diff changeset
192 return err;
64
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parents: 63
diff changeset
193 }