145 lines
4.2 KiB
C
Executable File
145 lines
4.2 KiB
C
Executable File
/*
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* Dropbear SSH
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*
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* Copyright (c) 2002,2003 Matt Johnston
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE. */
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#include "includes.h"
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#include "ssh.h"
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#include "tcpfwd.h"
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#include "dbutil.h"
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#include "session.h"
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#include "buffer.h"
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#include "packet.h"
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#include "listener.h"
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#include "runopts.h"
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#ifdef DROPBEAR_TCP_ACCEPT
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static void cleanup_tcp(struct Listener *listener) {
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struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata);
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m_free(tcpinfo->sendaddr);
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m_free(tcpinfo->listenaddr);
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m_free(tcpinfo);
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}
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static void tcp_acceptor(struct Listener *listener, int sock) {
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int fd;
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struct sockaddr_storage addr;
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socklen_t len;
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char ipstring[NI_MAXHOST], portstring[NI_MAXSERV];
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struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata);
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len = sizeof(addr);
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fd = accept(sock, (struct sockaddr*)&addr, &len);
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if (fd < 0) {
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return;
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}
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if (getnameinfo((struct sockaddr*)&addr, len, ipstring, sizeof(ipstring),
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portstring, sizeof(portstring),
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NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
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return;
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}
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if (send_msg_channel_open_init(fd, tcpinfo->chantype) == DROPBEAR_SUCCESS) {
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unsigned char* addr = NULL;
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unsigned int port = 0;
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if (tcpinfo->tcp_type == direct) {
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/* "direct-tcpip" */
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/* host to connect, port to connect */
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addr = tcpinfo->sendaddr;
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port = tcpinfo->sendport;
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} else {
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dropbear_assert(tcpinfo->tcp_type == forwarded);
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/* "forwarded-tcpip" */
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/* address that was connected, port that was connected */
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addr = tcpinfo->listenaddr;
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port = tcpinfo->listenport;
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}
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buf_putstring(ses.writepayload, addr, strlen(addr));
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buf_putint(ses.writepayload, port);
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/* originator ip */
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buf_putstring(ses.writepayload, ipstring, strlen(ipstring));
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/* originator port */
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buf_putint(ses.writepayload, atol(portstring));
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encrypt_packet();
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} else {
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/* XXX debug? */
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close(fd);
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}
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}
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int listen_tcpfwd(struct TCPListener* tcpinfo) {
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char portstring[NI_MAXSERV];
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int socks[DROPBEAR_MAX_SOCKS];
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struct Listener *listener = NULL;
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int nsocks;
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char* errstring = NULL;
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/* listen_spec = NULL indicates localhost */
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const char* listen_spec = NULL;
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TRACE(("enter listen_tcpfwd"))
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/* first we try to bind, so don't need to do so much cleanup on failure */
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snprintf(portstring, sizeof(portstring), "%d", tcpinfo->listenport);
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/* a listenaddr of "" will indicate all interfaces */
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if (opts.listen_fwd_all
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&& (strcmp(tcpinfo->listenaddr, "localhost") != 0) ) {
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listen_spec = tcpinfo->listenaddr;
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}
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nsocks = dropbear_listen(listen_spec, portstring, socks,
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DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd);
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if (nsocks < 0) {
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dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring);
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m_free(errstring);
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TRACE(("leave listen_tcpfwd: dropbear_listen failed"))
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return DROPBEAR_FAILURE;
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}
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m_free(errstring);
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/* new_listener will close the socks if it fails */
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listener = new_listener(socks, nsocks, CHANNEL_ID_TCPFORWARDED, tcpinfo,
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tcp_acceptor, cleanup_tcp);
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if (listener == NULL) {
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TRACE(("leave listen_tcpfwd: listener failed"))
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return DROPBEAR_FAILURE;
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}
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TRACE(("leave listen_tcpfwd: success"))
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return DROPBEAR_SUCCESS;
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}
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#endif /* DROPBEAR_TCP_ACCEPT */
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