Mercurial > dropbear

annotate tcp-accept.c @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents 5daedffd0769
children c45d65392c1a
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 "ssh.h"
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27 #include "tcpfwd.h"
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28 #include "dbutil.h"
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29 #include "session.h"
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30 #include "buffer.h"
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31 #include "packet.h"
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32 #include "listener.h"
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33 #include "listener.h"
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34 #include "runopts.h"
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35
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36 #ifdef DROPBEAR_TCP_ACCEPT
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37
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38 static void cleanup_tcp(struct Listener *listener) {
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39
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40 struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata);
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41
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42 m_free(tcpinfo->sendaddr);
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43 m_free(tcpinfo->listenaddr);
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44 m_free(tcpinfo->request_listenaddr);
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45 m_free(tcpinfo);
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46 }
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47
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48 int tcp_prio_inithandler(struct Channel* channel)
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49 {
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50 TRACE(("tcp_prio_inithandler channel %d", channel->index))
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51 channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE;
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52 return 0;
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53 }
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54
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55 static void tcp_acceptor(struct Listener *listener, int sock) {
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56
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57 int fd;
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58 struct sockaddr_storage addr;
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59 socklen_t len;
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60 char ipstring[NI_MAXHOST], portstring[NI_MAXSERV];
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61 struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata);
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62
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63 len = sizeof(addr);
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64
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65 fd = accept(sock, (struct sockaddr*)&addr, &len);
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66 if (fd < 0) {
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67 return;
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68 }
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69
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70 if (getnameinfo((struct sockaddr*)&addr, len, ipstring, sizeof(ipstring),
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71 portstring, sizeof(portstring),
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72 NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
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73 m_close(fd);
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74 return;
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75 }
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76
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77 if (send_msg_channel_open_init(fd, tcpinfo->chantype) == DROPBEAR_SUCCESS) {
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78 unsigned char* addr = NULL;
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79 unsigned int port = 0;
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80
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81 if (tcpinfo->tcp_type == direct) {
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82 /* "direct-tcpip" */
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83 /* host to connect, port to connect */
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84 addr = tcpinfo->sendaddr;
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85 port = tcpinfo->sendport;
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86 } else {
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87 dropbear_assert(tcpinfo->tcp_type == forwarded);
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88 /* "forwarded-tcpip" */
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89 /* address that was connected, port that was connected */
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90 addr = tcpinfo->request_listenaddr;
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91 port = tcpinfo->listenport;
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92 }
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93
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94 if (addr == NULL) {
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95 addr = "localhost";
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96 }
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97 buf_putstring(ses.writepayload, addr, strlen(addr));
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98 buf_putint(ses.writepayload, port);
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99
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100 /* originator ip */
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101 buf_putstring(ses.writepayload, ipstring, strlen(ipstring));
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102 /* originator port */
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103 buf_putint(ses.writepayload, atol(portstring));
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104
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105 encrypt_packet();
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106
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107 } else {
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108 /* XXX debug? */
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109 close(fd);
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110 }
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111 }
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112
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113 int listen_tcpfwd(struct TCPListener* tcpinfo) {
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114
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115 char portstring[NI_MAXSERV];
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116 int socks[DROPBEAR_MAX_SOCKS];
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117 struct Listener *listener = NULL;
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118 int nsocks;
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119 char* errstring = NULL;
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120
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121 TRACE(("enter listen_tcpfwd"))
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122
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123 /* first we try to bind, so don't need to do so much cleanup on failure */
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124 snprintf(portstring, sizeof(portstring), "%d", tcpinfo->listenport);
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125
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126 nsocks = dropbear_listen(tcpinfo->listenaddr, portstring, socks,
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127 DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd);
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128 if (nsocks < 0) {
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129 dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring);
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130 m_free(errstring);
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131 TRACE(("leave listen_tcpfwd: dropbear_listen failed"))
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132 return DROPBEAR_FAILURE;
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133 }
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134 m_free(errstring);
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135
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136 /* new_listener will close the socks if it fails */
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137 listener = new_listener(socks, nsocks, CHANNEL_ID_TCPFORWARDED, tcpinfo,
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138 tcp_acceptor, cleanup_tcp);
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139
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140 if (listener == NULL) {
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141 TRACE(("leave listen_tcpfwd: listener failed"))
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142 return DROPBEAR_FAILURE;
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143 }
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144
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145 TRACE(("leave listen_tcpfwd: success"))
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parents:
diff changeset
146 return DROPBEAR_SUCCESS;
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents:
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147 }
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
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148
65
02e4a7f614f8 Oops, forgot to call the actual code.
Matt Johnston <matt@ucc.asn.au>
parents: 64
diff changeset
149 #endif /* DROPBEAR_TCP_ACCEPT */