X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/5f2e19fcf977f48387d918948aa3ed66748208b0..b7a189f38294c745ae4ea6efb55891c8196e275b:/portfwd.c

diff --git a/portfwd.c b/portfwd.c
index 4d77ae17..dc865f62 100644
--- a/portfwd.c
+++ b/portfwd.c
@@ -1,4 +1,3 @@
-#include <windows.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -52,9 +51,6 @@
   (cp)[0] = (value) >> 8, \
   (cp)[1] = (value) )
 
-extern void sshfwd_close(void *);
-extern void sshfwd_write(void *, char *, int);
-
 struct pfwd_queue {
     struct pfwd_queue *next;
     char *buf;
@@ -64,8 +60,11 @@ struct PFwdPrivate {
     struct plug_function_table *fn;
     /* the above variable absolutely *must* be the first in this structure */
     void *c;			       /* (channel) data used by ssh.c */
+    void *backhandle;		       /* instance of SSH backend itself */
+    /* Note that backhandle need not be filled in if c is non-NULL */
     Socket s;
     char hostname[128];
+    int throttled, throttle_override;
     int port;
     int ready;
     struct pfwd_queue *waiting;
@@ -92,12 +91,22 @@ static int pfd_closing(Plug plug, char *error_msg, int error_code,
 static int pfd_receive(Plug plug, int urgent, char *data, int len)
 {
     struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
-
-    if (pr->ready)
-	sshfwd_write(pr->c, data, len);
+    if (pr->ready) {
+	if (sshfwd_write(pr->c, data, len) > 0) {
+	    pr->throttled = 1;
+	    sk_set_frozen(pr->s, 1);
+	}
+    }
     return 1;
 }
 
+static void pfd_sent(Plug plug, int bufsize)
+{
+    struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
+
+    sshfwd_unthrottle(pr->c, bufsize);
+}
+
 /*
  * Called when receiving a PORT OPEN from the server
  */
@@ -106,6 +115,7 @@ char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
     static struct plug_function_table fn_table = {
 	pfd_closing,
 	pfd_receive,
+	pfd_sent,
 	NULL
     };
 
@@ -116,7 +126,7 @@ char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
     /*
      * Try to find host.
      */
-    addr = sk_namelookup(hostname, &dummy_realhost);
+    addr = name_lookup(hostname, port, &dummy_realhost);
     if ((err = sk_addr_error(addr)))
 	return err;
 
@@ -125,10 +135,12 @@ char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
      */
     pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
     pr->fn = &fn_table;
+    pr->throttled = pr->throttle_override = 0;
     pr->ready = 1;
     pr->c = c;
+    pr->backhandle = NULL;	       /* we shouldn't need this */
 
-    pr->s = *s = sk_new(addr, port, 0, 1, (Plug) pr);
+    pr->s = *s = new_connection(addr, dummy_realhost, port, 0, 1, 0, (Plug) pr);
     if ((err = sk_socket_error(*s))) {
 	sfree(pr);
 	return err;
@@ -143,27 +155,24 @@ char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
  called when someone connects to the local port
  */
 
-static int pfd_accepting(Plug p, struct sockaddr *addr, void *sock)
+static int pfd_accepting(Plug p, void *sock)
 {
-    /* for now always accept this socket */
     static struct plug_function_table fn_table = {
 	pfd_closing,
 	pfd_receive,
+	pfd_sent,
 	NULL
     };
     struct PFwdPrivate *pr, *org;
-    struct sockaddr_in *sin = (struct sockaddr_in *)addr;
     Socket s;
     char *err;
 
-    if (ntohl(sin->sin_addr.s_addr) != 0x7F000001 && !cfg.lport_acceptall)
-	return 1; /* denied */
-
     org = (struct PFwdPrivate *)p;
     pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
     pr->fn = &fn_table;
 
     pr->c = NULL;
+    pr->backhandle = org->backhandle;
 
     pr->s = s = sk_register(sock, (Plug) pr);
     if ((err = sk_socket_error(s))) {
@@ -171,10 +180,11 @@ static int pfd_accepting(Plug p, struct sockaddr *addr, void *sock)
 	return err != NULL;
     }
 
-    pr->c = new_sock_channel(s);
+    pr->c = new_sock_channel(org->backhandle, s);
 
     strcpy(pr->hostname, org->hostname);
     pr->port = org->port;
+    pr->throttled = pr->throttle_override = 0;
     pr->ready = 0;
     pr->waiting = NULL;
 
@@ -193,13 +203,15 @@ static int pfd_accepting(Plug p, struct sockaddr *addr, void *sock)
 
 
 /* Add a new forwarding from port -> desthost:destport
- sets up a listenner on the local machine on port
+ sets up a listener on the local machine on (srcaddr:)port
  */
-char *pfd_addforward(char *desthost, int destport, int port)
+char *pfd_addforward(char *desthost, int destport, char *srcaddr, int port,
+		     void *backhandle)
 {
     static struct plug_function_table fn_table = {
 	pfd_closing,
-	pfd_receive, /* should not happen... */
+	pfd_receive,		       /* should not happen... */
+	pfd_sent,		       /* also should not happen */
 	pfd_accepting
     };
 
@@ -215,10 +227,12 @@ char *pfd_addforward(char *desthost, int destport, int port)
     pr->c = NULL;
     strcpy(pr->hostname, desthost);
     pr->port = destport;
+    pr->throttled = pr->throttle_override = 0;
     pr->ready = 0;
     pr->waiting = NULL;
+    pr->backhandle = backhandle;
 
-    pr->s = s = sk_newlistenner(port, (Plug) pr);
+    pr->s = s = new_listener(srcaddr, port, (Plug) pr, !cfg.lport_acceptall);
     if ((err = sk_socket_error(s))) {
 	sfree(pr);
 	return err;
@@ -243,15 +257,36 @@ void pfd_close(Socket s)
     sk_close(s);
 }
 
+void pfd_unthrottle(Socket s)
+{
+    struct PFwdPrivate *pr;
+    if (!s)
+	return;
+    pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
+
+    pr->throttled = 0;
+    sk_set_frozen(s, pr->throttled || pr->throttle_override);
+}
+
+void pfd_override_throttle(Socket s, int enable)
+{
+    struct PFwdPrivate *pr;
+    if (!s)
+	return;
+    pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
+
+    pr->throttle_override = enable;
+    sk_set_frozen(s, pr->throttled || pr->throttle_override);
+}
+
 /*
  * Called to send data down the raw connection.
  */
-void pfd_send(Socket s, char *data, int len)
+int pfd_send(Socket s, char *data, int len)
 {
     if (s == NULL)
-	return;
-
-    sk_write(s, data, len);
+	return 0;
+    return sk_write(s, data, len);
 }