Mercurial > dropbear

comparison tcp-accept.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents 3cea9d789cca
children 454a34b2dfd1 6aea2cfc113e
comparison
equal deleted inserted replaced
281:997e6f7dc01e 285:1b9e69c058d2
1 /*
2 * Dropbear SSH
3 *
4 * Copyright (c) 2002,2003 Matt Johnston
5 * All rights reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE. */
24
25 #include "includes.h"
26 #include "ssh.h"
27 #include "tcpfwd.h"
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
35 #ifdef DROPBEAR_TCP_ACCEPT
36
37 static void cleanup_tcp(struct Listener *listener) {
38
39 struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata);
40
41 m_free(tcpinfo->sendaddr);
42 m_free(tcpinfo->listenaddr);
43 m_free(tcpinfo);
44 }
45
46 static void tcp_acceptor(struct Listener *listener, int sock) {
47
48 int fd;
49 struct sockaddr_storage addr;
50 socklen_t len;
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) {
68 unsigned char* addr = NULL;
69 unsigned int port = 0;
70
71 if (tcpinfo->tcp_type == direct) {
72 /* "direct-tcpip" */
73 /* host to connect, port to connect */
74 addr = tcpinfo->sendaddr;
75 port = tcpinfo->sendport;
76 } else {
77 dropbear_assert(tcpinfo->tcp_type == forwarded);
78 /* "forwarded-tcpip" */
79 /* address that was connected, port that was connected */
80 addr = tcpinfo->listenaddr;
81 port = tcpinfo->listenport;
82 }
83
84 buf_putstring(ses.writepayload, addr, strlen(addr));
85 buf_putint(ses.writepayload, port);
86
87 /* originator ip */
88 buf_putstring(ses.writepayload, ipstring, strlen(ipstring));
89 /* originator port */
90 buf_putint(ses.writepayload, atol(portstring));
91
92 encrypt_packet();
93
94 } else {
95 /* XXX debug? */
96 close(fd);
97 }
98 }
99
100 int listen_tcpfwd(struct TCPListener* tcpinfo) {
101
102 char portstring[NI_MAXSERV];
103 int socks[DROPBEAR_MAX_SOCKS];
104 struct Listener *listener = NULL;
105 int nsocks;
106 char* errstring = NULL;
107 // listen_spec = NULL indicates localhost
108 const char* listen_spec = NULL;
109
110 TRACE(("enter listen_tcpfwd"))
111
112 /* first we try to bind, so don't need to do so much cleanup on failure */
113 snprintf(portstring, sizeof(portstring), "%d", tcpinfo->listenport);
114
115 /* a listenaddr of "" will indicate all interfaces */
116 if (opts.listen_fwd_all
117 && (strcmp(tcpinfo->listenaddr, "localhost") != 0) ) {
118 listen_spec = tcpinfo->listenaddr;
119 }
120
121 nsocks = dropbear_listen(listen_spec, portstring, socks,
122 DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd);
123 if (nsocks < 0) {
124 dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring);
125 m_free(errstring);
126 TRACE(("leave listen_tcpfwd: dropbear_listen failed"))
127 return DROPBEAR_FAILURE;
128 }
129
130 listener = new_listener(socks, nsocks, CHANNEL_ID_TCPFORWARDED, tcpinfo,
131 tcp_acceptor, cleanup_tcp);
132
133 if (listener == NULL) {
134 m_free(tcpinfo);
135 TRACE(("leave listen_tcpfwd: listener failed"))
136 return DROPBEAR_FAILURE;
137 }
138
139 TRACE(("leave listen_tcpfwd: success"))
140 return DROPBEAR_SUCCESS;
141 }
142
143 #endif /* DROPBEAR_TCP_ACCEPT */