Mercurial > dropbear
annotate tcp-accept.c @ 584:0442c18da5c9
Comment public/private parts
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Tue, 20 Jul 2010 13:54:20 +0000 |
| parents | 69e98c45db7c |
| children | d2daeb015138 |
| 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 | 25 #include "includes.h" |
| 26 #include "ssh.h" | |
| 64 | 27 #include "tcpfwd.h" |
| 62 | 28 #include "dbutil.h" |
| 29 #include "session.h" | |
| 30 #include "buffer.h" | |
| 31 #include "packet.h" | |
| 32 #include "listener.h" | |
| 33 #include "runopts.h" | |
| 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->listenaddr); |
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43 m_free(tcpinfo); |
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44 } |
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45 |
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46 static void tcp_acceptor(struct Listener *listener, int sock) { |
| 62 | 47 |
| 48 int fd; | |
| 49 struct sockaddr_storage addr; | |
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50 socklen_t len; |
| 62 | 51 char ipstring[NI_MAXHOST], portstring[NI_MAXSERV]; |
| 52 struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata); | |
| 53 | |
| 54 len = sizeof(addr); | |
| 55 | |
| 56 fd = accept(sock, (struct sockaddr*)&addr, &len); | |
| 57 if (fd < 0) { | |
| 58 return; | |
| 59 } | |
| 60 | |
| 61 if (getnameinfo((struct sockaddr*)&addr, len, ipstring, sizeof(ipstring), | |
| 62 portstring, sizeof(portstring), | |
| 63 NI_NUMERICHOST | NI_NUMERICSERV) != 0) { | |
| 64 return; | |
| 65 } | |
| 66 | |
| 67 if (send_msg_channel_open_init(fd, tcpinfo->chantype) == DROPBEAR_SUCCESS) { | |
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68 unsigned char* addr = NULL; |
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69 unsigned int port = 0; |
| 62 | 70 |
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71 if (tcpinfo->tcp_type == direct) { |
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72 /* "direct-tcpip" */ |
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73 /* host to connect, port to connect */ |
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74 addr = tcpinfo->sendaddr; |
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75 port = tcpinfo->sendport; |
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76 } else { |
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77 dropbear_assert(tcpinfo->tcp_type == forwarded); |
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78 /* "forwarded-tcpip" */ |
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79 /* address that was connected, port that was connected */ |
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80 addr = tcpinfo->listenaddr; |
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81 port = tcpinfo->listenport; |
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82 } |
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83 |
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84 buf_putstring(ses.writepayload, addr, strlen(addr)); |
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85 buf_putint(ses.writepayload, port); |
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86 |
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87 /* originator ip */ |
| 62 | 88 buf_putstring(ses.writepayload, ipstring, strlen(ipstring)); |
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89 /* originator port */ |
| 62 | 90 buf_putint(ses.writepayload, atol(portstring)); |
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91 |
| 62 | 92 encrypt_packet(); |
| 93 | |
| 94 } else { | |
| 95 /* XXX debug? */ | |
| 96 close(fd); | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 int listen_tcpfwd(struct TCPListener* tcpinfo) { | |
| 101 | |
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102 char portstring[NI_MAXSERV]; |
| 62 | 103 int socks[DROPBEAR_MAX_SOCKS]; |
| 104 struct Listener *listener = NULL; | |
| 105 int nsocks; | |
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106 char* errstring = NULL; |
| 62 | 107 |
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108 TRACE(("enter listen_tcpfwd")) |
| 62 | 109 |
| 110 /* first we try to bind, so don't need to do so much cleanup on failure */ | |
| 64 | 111 snprintf(portstring, sizeof(portstring), "%d", tcpinfo->listenport); |
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112 |
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113 nsocks = dropbear_listen(tcpinfo->listenaddr, portstring, socks, |
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114 DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd); |
| 62 | 115 if (nsocks < 0) { |
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116 dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring); |
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117 m_free(errstring); |
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118 TRACE(("leave listen_tcpfwd: dropbear_listen failed")) |
| 62 | 119 return DROPBEAR_FAILURE; |
| 120 } | |
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121 m_free(errstring); |
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122 |
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123 /* new_listener will close the socks if it fails */ |
| 62 | 124 listener = new_listener(socks, nsocks, CHANNEL_ID_TCPFORWARDED, tcpinfo, |
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125 tcp_acceptor, cleanup_tcp); |
| 62 | 126 |
| 127 if (listener == NULL) { | |
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128 TRACE(("leave listen_tcpfwd: listener failed")) |
| 62 | 129 return DROPBEAR_FAILURE; |
| 130 } | |
| 131 | |
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132 TRACE(("leave listen_tcpfwd: success")) |
| 62 | 133 return DROPBEAR_SUCCESS; |
| 134 } | |
| 135 | |
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136 #endif /* DROPBEAR_TCP_ACCEPT */ |