+/*
+ * SSH port forwarding.
+ */
+
#include <stdio.h>
#include <stdlib.h>
#define TRUE 1
#endif
-#define GET_32BIT_LSB_FIRST(cp) \
- (((unsigned long)(unsigned char)(cp)[0]) | \
- ((unsigned long)(unsigned char)(cp)[1] << 8) | \
- ((unsigned long)(unsigned char)(cp)[2] << 16) | \
- ((unsigned long)(unsigned char)(cp)[3] << 24))
-
-#define PUT_32BIT_LSB_FIRST(cp, value) ( \
- (cp)[0] = (value), \
- (cp)[1] = (value) >> 8, \
- (cp)[2] = (value) >> 16, \
- (cp)[3] = (value) >> 24 )
-
-#define GET_16BIT_LSB_FIRST(cp) \
- (((unsigned long)(unsigned char)(cp)[0]) | \
- ((unsigned long)(unsigned char)(cp)[1] << 8))
-
-#define PUT_16BIT_LSB_FIRST(cp, value) ( \
- (cp)[0] = (value), \
- (cp)[1] = (value) >> 8 )
-
-#define GET_32BIT_MSB_FIRST(cp) \
- (((unsigned long)(unsigned char)(cp)[0] << 24) | \
- ((unsigned long)(unsigned char)(cp)[1] << 16) | \
- ((unsigned long)(unsigned char)(cp)[2] << 8) | \
- ((unsigned long)(unsigned char)(cp)[3]))
-
-#define PUT_32BIT_MSB_FIRST(cp, value) ( \
- (cp)[0] = (value) >> 24, \
- (cp)[1] = (value) >> 16, \
- (cp)[2] = (value) >> 8, \
- (cp)[3] = (value) )
-
-#define GET_16BIT_MSB_FIRST(cp) \
- (((unsigned long)(unsigned char)(cp)[0] << 8) | \
- ((unsigned long)(unsigned char)(cp)[1]))
-
-#define PUT_16BIT_MSB_FIRST(cp, value) ( \
- (cp)[0] = (value) >> 8, \
- (cp)[1] = (value) )
-
struct PFwdPrivate {
const struct plug_function_table *fn;
/* the above variable absolutely *must* be the first in this structure */
int buflen;
};
+static void pfd_log(Plug plug, int type, SockAddr addr, int port,
+ const char *error_msg, int error_code)
+{
+ /* we have to dump these since we have no interface to logging.c */
+}
+
static int pfd_closing(Plug plug, const char *error_msg, int error_code,
int calling_back)
{
struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
- /*
- * We have no way to communicate down the forwarded connection,
- * so if an error occurred on the socket, we just ignore it
- * and treat it like a proper close.
- */
- if (pr->c)
- sshfwd_close(pr->c);
- pfd_close(pr->s);
+ if (error_msg) {
+ /*
+ * Socket error. Slam the connection instantly shut.
+ */
+ sshfwd_unclean_close(pr->c);
+ } else {
+ /*
+ * Ordinary EOF received on socket. Send an EOF on the SSH
+ * channel.
+ */
+ if (pr->c)
+ sshfwd_write_eof(pr->c);
+ }
+
return 1;
}
struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
if (pr->dynamic) {
while (len--) {
+ /*
+ * Throughout SOCKS negotiation, "hostname" is re-used as a
+ * random protocol buffer with "port" storing the length.
+ */
if (pr->port >= lenof(pr->hostname)) {
/* Request too long. */
if ((pr->dynamic >> 12) == 4) {
pr->dynamic = 0x4000;
if (pr->port < 2) continue;/* don't have command code yet */
if (pr->hostname[1] != 1) {
+ /* Not CONNECT. */
/* Send back a SOCKS 4 error before closing. */
char data[8];
memset(data, 0, sizeof(data));
pfd_close(pr->s);
return 1;
}
- if (pr->port < 8) continue; /* haven't started username */
+ if (pr->port <= 8) continue; /* haven't started user/hostname */
if (pr->hostname[pr->port-1] != 0)
- continue; /* haven't _finished_ username */
+ continue; /* haven't _finished_ user/hostname */
/*
* Now we have a full SOCKS 4 request. Check it to
* see if it's a SOCKS 4A request.
pr->hostname[0] = 0; /* reply version code */
pr->hostname[1] = 90; /* request granted */
sk_write(pr->s, pr->hostname, 8);
- len= pr->port;
+ len= pr->port - 8;
pr->port = GET_16BIT_MSB_FIRST(pr->hostname+2);
memmove(pr->hostname, pr->hostname + 8, len);
goto connect;
if (pr->hostname[1] != 1 || pr->hostname[2] != 0) {
/* Not CONNECT or reserved field nonzero - error */
reply[1] = 1; /* generic failure */
- sk_write(pr->s, reply, lenof(reply));
+ sk_write(pr->s, (char *) reply, lenof(reply));
pfd_close(pr->s);
return 1;
}
pr->port = GET_16BIT_MSB_FIRST(pr->hostname+4+alen);
if (atype == 1) {
/* REP=0 (success) already */
- sk_write(pr->s, reply, lenof(reply));
+ sk_write(pr->s, (char *) reply, lenof(reply));
sprintf(pr->hostname, "%d.%d.%d.%d",
(unsigned char)pr->hostname[4],
(unsigned char)pr->hostname[5],
goto connect;
} else if (atype == 3) {
/* REP=0 (success) already */
- sk_write(pr->s, reply, lenof(reply));
+ sk_write(pr->s, (char *) reply, lenof(reply));
memmove(pr->hostname, pr->hostname + 5, alen-1);
pr->hostname[alen-1] = '\0';
goto connect;
* Unknown address type. (FIXME: support IPv6!)
*/
reply[1] = 8; /* atype not supported */
- sk_write(pr->s, reply, lenof(reply));
+ sk_write(pr->s, (char *) reply, lenof(reply));
pfd_close(pr->s);
- return 1;
+ return 1;
}
}
}
-
+
/*
* If we get here without either having done `continue'
* or `goto connect', it must be because there is no
*/
connect:
+ /*
+ * Freeze the socket until the SSH server confirms the
+ * connection.
+ */
+ sk_set_frozen(pr->s, 1);
+
pr->c = new_sock_channel(pr->backhandle, pr->s);
if (pr->c == NULL) {
pfd_close(pr->s);
pr->dynamic = 0;
/*
- * Now freeze the socket until the SSH server confirms the
- * connection.
- */
- sk_set_frozen(pr->s, 1);
- /*
* If there's any data remaining in our current buffer,
* save it to be sent on pfd_confirm().
*/
* Called when receiving a PORT OPEN from the server
*/
const char *pfd_newconnect(Socket *s, char *hostname, int port,
- void *c, const Config *cfg)
+ void *c, Conf *conf, int addressfamily)
{
static const struct plug_function_table fn_table = {
+ pfd_log,
pfd_closing,
pfd_receive,
pfd_sent,
/*
* Try to find host.
*/
- addr = name_lookup(hostname, port, &dummy_realhost, cfg);
+ addr = name_lookup(hostname, port, &dummy_realhost, conf, addressfamily);
if ((err = sk_addr_error(addr)) != NULL) {
sk_addr_free(addr);
return err;
pr->dynamic = 0;
pr->s = *s = new_connection(addr, dummy_realhost, port,
- 0, 1, 0, (Plug) pr, cfg);
+ 0, 1, 0, 0, (Plug) pr, conf);
if ((err = sk_socket_error(*s)) != NULL) {
sfree(pr);
return err;
static int pfd_accepting(Plug p, OSSocket sock)
{
static const struct plug_function_table fn_table = {
+ pfd_log,
pfd_closing,
pfd_receive,
pfd_sent,
if (org->dynamic) {
pr->dynamic = 1;
- pr->port = 0; /* hostname buffer is so far empty */
+ pr->port = 0; /* "hostname" buffer is so far empty */
sk_set_frozen(s, 0); /* we want to receive SOCKS _now_! */
} else {
pr->dynamic = 0;
sets up a listener on the local machine on (srcaddr:)port
*/
const char *pfd_addforward(char *desthost, int destport, char *srcaddr,
- int port, void *backhandle, const Config *cfg)
+ int port, void *backhandle, Conf *conf,
+ void **sockdata, int address_family)
{
static const struct plug_function_table fn_table = {
+ pfd_log,
pfd_closing,
pfd_receive, /* should not happen... */
pfd_sent, /* also should not happen */
pr->backhandle = backhandle;
pr->s = s = new_listener(srcaddr, port, (Plug) pr,
- !cfg->lport_acceptall, cfg);
+ !conf_get_int(conf, CONF_lport_acceptall),
+ conf, address_family);
if ((err = sk_socket_error(s)) != NULL) {
sfree(pr);
return err;
sk_set_private_ptr(s, pr);
+ *sockdata = (void *)s;
+
return NULL;
}
sk_close(s);
}
+/*
+ * Terminate a listener.
+ */
+void pfd_terminate(void *sv)
+{
+ pfd_close((Socket)sv);
+}
+
void pfd_unthrottle(Socket s)
{
struct PFwdPrivate *pr;
return sk_write(s, data, len);
}
+void pfd_send_eof(Socket s)
+{
+ sk_write_eof(s);
+}
void pfd_confirm(Socket s)
{
~mdw / sgt / putty / blobdiff