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