Mercurial > dropbear

annotate tcp-accept.c @ 75:a54d20c96178

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Some documentation touchups
author Matt Johnston <matt@ucc.asn.au>
date Sat, 14 Aug 2004 17:59:42 +0000
parents e3adf4cf5465
children 0cfba3034be5
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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
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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 "runopts.h"
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34
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35 #ifdef DROPBEAR_TCP_ACCEPT
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36
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37 static void cleanup_tcp(struct Listener *listener) {
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38
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39 struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata);
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40
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41 m_free(tcpinfo->sendaddr);
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42 m_free(tcpinfo);
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43 }
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44
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45 static void tcp_acceptor(struct Listener *listener, int sock) {
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46
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47 int fd;
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48 struct sockaddr_storage addr;
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49 int len;
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50 char ipstring[NI_MAXHOST], portstring[NI_MAXSERV];
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51 struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata);
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52
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53 len = sizeof(addr);
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54
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55 fd = accept(sock, (struct sockaddr*)&addr, &len);
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56 if (fd < 0) {
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57 return;
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58 }
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59
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60 if (getnameinfo((struct sockaddr*)&addr, len, ipstring, sizeof(ipstring),
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61 portstring, sizeof(portstring),
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62 NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
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63 return;
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64 }
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65
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66 if (send_msg_channel_open_init(fd, tcpinfo->chantype) == DROPBEAR_SUCCESS) {
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67
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68 buf_putstring(ses.writepayload, tcpinfo->sendaddr,
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69 strlen(tcpinfo->sendaddr));
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70 buf_putint(ses.writepayload, tcpinfo->sendport);
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71 buf_putstring(ses.writepayload, ipstring, strlen(ipstring));
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72 buf_putint(ses.writepayload, atol(portstring));
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73
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74 encrypt_packet();
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75
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76 } else {
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77 /* XXX debug? */
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78 close(fd);
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79 }
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80 }
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81
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82 int listen_tcpfwd(struct TCPListener* tcpinfo) {
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83
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84 char portstring[NI_MAXSERV];
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85 int socks[DROPBEAR_MAX_SOCKS];
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86 struct Listener *listener = NULL;
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87 int nsocks;
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88 char* errstring = NULL;
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89
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90 TRACE(("enter listen_tcpfwd"));
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91
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92 /* first we try to bind, so don't need to do so much cleanup on failure */
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93 snprintf(portstring, sizeof(portstring), "%d", tcpinfo->listenport);
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94
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95 /* XXX Note: we're just listening on localhost, no matter what they tell
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96 * us. If someone wants to make it listen otherways, then change
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97 * the "" argument. but that requires UI changes too */
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98 nsocks = dropbear_listen("", portstring, socks,
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99 DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd);
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100 if (nsocks < 0) {
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101 dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring);
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102 m_free(errstring);
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103 TRACE(("leave listen_tcpfwd: dropbear_listen failed"));
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104 return DROPBEAR_FAILURE;
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105 }
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106
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107 listener = new_listener(socks, nsocks, CHANNEL_ID_TCPFORWARDED, tcpinfo,
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108 tcp_acceptor, cleanup_tcp);
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109
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110 if (listener == NULL) {
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111 m_free(tcpinfo);
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112 TRACE(("leave listen_tcpfwd: listener failed"));
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113 return DROPBEAR_FAILURE;
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114 }
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115
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116 TRACE(("leave listen_tcpfwd: success"));
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117 return DROPBEAR_SUCCESS;
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118 }
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119
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120 #endif /* DROPBEAR_TCP_ACCEPT */