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#include "includes.h"
#include "options.h"
#include "dbutil.h"
#include "tcpfwd.h"
#include "channel.h"
#include "runopts.h"
#include "session.h"
#include "ssh.h"
static int cli_localtcp(unsigned int listenport, const char* remoteaddr,
unsigned int remoteport);
static int newtcpforwarded(struct Channel * channel);
const struct ChanType cli_chan_tcpremote = {
1, /* sepfds */
"forwarded-tcpip",
newtcpforwarded,
NULL,
NULL,
NULL
};
static const struct ChanType cli_chan_tcplocal = {
1, /* sepfds */
"direct-tcpip",
NULL,
NULL,
NULL,
NULL
};
void setup_localtcp() {
int ret;
TRACE(("enter setup_localtcp"));
if (cli_opts.localfwds == NULL) {
TRACE(("cli_opts.localfwds == NULL"));
}
while (cli_opts.localfwds != NULL) {
ret = cli_localtcp(cli_opts.localfwds->listenport,
cli_opts.localfwds->connectaddr,
cli_opts.localfwds->connectport);
if (ret == DROPBEAR_FAILURE) {
dropbear_log(LOG_WARNING, "Failed local port forward %d:%s:%d",
cli_opts.localfwds->listenport,
cli_opts.localfwds->connectaddr,
cli_opts.localfwds->connectport);
}
cli_opts.localfwds = cli_opts.localfwds->next;
}
TRACE(("leave setup_localtcp"));
}
static int cli_localtcp(unsigned int listenport, const char* remoteaddr,
unsigned int remoteport) {
struct TCPListener* tcpinfo = NULL;
int ret;
TRACE(("enter cli_localtcp: %d %s %d", listenport, remoteaddr,
remoteport));
tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener*));
tcpinfo->sendaddr = remoteaddr;
tcpinfo->sendport = remoteport;
tcpinfo->listenport = listenport;
tcpinfo->chantype = &cli_chan_tcplocal;
ret = listen_tcpfwd(tcpinfo);
if (ret == DROPBEAR_FAILURE) {
m_free(tcpinfo);
}
TRACE(("leave cli_localtcp: %d", ret));
return ret;
}
static void send_msg_global_request_remotetcp(int port) {
TRACE(("enter send_msg_global_request_remotetcp"));
CHECKCLEARTOWRITE();
buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST);
buf_putstring(ses.writepayload, "tcpip-forward", 13);
buf_putbyte(ses.writepayload, 0);
buf_putstring(ses.writepayload, "0.0.0.0", 7); /* TODO: IPv6? */
buf_putint(ses.writepayload, port);
encrypt_packet();
TRACE(("leave send_msg_global_request_remotetcp"));
}
void setup_remotetcp() {
struct TCPFwdList * iter = NULL;
TRACE(("enter setup_remotetcp"));
if (cli_opts.remotefwds == NULL) {
TRACE(("cli_opts.remotefwds == NULL"));
}
iter = cli_opts.remotefwds;
while (iter != NULL) {
send_msg_global_request_remotetcp(iter->listenport);
iter = iter->next;
}
TRACE(("leave setup_remotetcp"));
}
static int newtcpforwarded(struct Channel * channel) {
unsigned int origport;
struct TCPFwdList * iter = NULL;
char portstring[NI_MAXSERV];
int sock;
int ret = DROPBEAR_FAILURE;
/* We don't care what address they connected to */
buf_eatstring(ses.payload);
origport = buf_getint(ses.payload);
/* Find which port corresponds */
iter = cli_opts.remotefwds;
while (iter != NULL) {
if (origport == iter->listenport) {
break;
}
iter = iter->next;
}
if (iter == NULL) {
/* We didn't request forwarding on that port */
dropbear_log(LOG_INFO, "Server send unrequested port, from port %d",
origport);
goto out;
}
snprintf(portstring, sizeof(portstring), "%d", iter->connectport);
sock = connect_remote(iter->connectaddr, portstring, 1, NULL);
if (sock < 0) {
TRACE(("leave newtcpdirect: sock failed"));
goto out;
}
ses.maxfd = MAX(ses.maxfd, sock);
/* Note that infd is actually the "outgoing" direction on the
* tcp connection, vice versa for outfd.
* We don't set outfd, that will get set after the connection's
* progress succeeds */
channel->infd = sock;
channel->initconn = 1;
ret = DROPBEAR_SUCCESS;
out:
TRACE(("leave newtcpdirect: ret %d", ret));
return ret;
}
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