X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/c69784c016672f18d546875689652c4b54431bad..5f4e628b09b4b279dc633d639ce4598a4acec26d:/ssh.c

diff --git a/ssh.c b/ssh.c
index 3464ea54..505b4ae1 100644
--- a/ssh.c
+++ b/ssh.c
@@ -558,7 +558,15 @@ enum {				       /* channel types */
     CHAN_X11,
     CHAN_AGENT,
     CHAN_SOCKDATA,
-    CHAN_SOCKDATA_DORMANT	       /* one the remote hasn't confirmed */
+    CHAN_SOCKDATA_DORMANT,	       /* one the remote hasn't confirmed */
+    /*
+     * CHAN_ZOMBIE is used to indicate a channel for which we've
+     * already destroyed the local data source: for instance, if a
+     * forwarded port experiences a socket error on the local side, we
+     * immediately destroy its local socket and turn the SSH channel
+     * into CHAN_ZOMBIE.
+     */
+    CHAN_ZOMBIE
 };
 
 /*
@@ -4250,6 +4258,35 @@ void sshfwd_write_eof(struct ssh_channel *c)
     ssh_channel_try_eof(c);
 }
 
+void sshfwd_unclean_close(struct ssh_channel *c)
+{
+    Ssh ssh = c->ssh;
+    struct Packet *pktout;
+
+    if (ssh->state == SSH_STATE_CLOSED)
+	return;
+
+    if (!(c->closes & CLOSES_SENT_CLOSE)) {
+        pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE);
+        ssh2_pkt_adduint32(pktout, c->remoteid);
+        ssh2_pkt_send(ssh, pktout);
+        c->closes |= CLOSES_SENT_EOF | CLOSES_SENT_CLOSE;
+    }
+
+    switch (c->type) {
+      case CHAN_X11:
+        x11_close(c->u.x11.s);
+        break;
+      case CHAN_SOCKDATA:
+      case CHAN_SOCKDATA_DORMANT:
+        pfd_close(c->u.pfd.s);
+        break;
+    }
+    c->type = CHAN_ZOMBIE;
+
+    ssh2_channel_check_close(c);
+}
+
 int sshfwd_write(struct ssh_channel *c, char *buf, int len)
 {
     Ssh ssh = c->ssh;
@@ -6551,9 +6588,10 @@ static void ssh2_set_window(struct ssh_channel *c, int newwin)
     /*
      * Never send WINDOW_ADJUST for a channel that the remote side has
      * already sent EOF on; there's no point, since it won't be
-     * sending any more data anyway.
+     * sending any more data anyway. Ditto if _we've_ already sent
+     * CLOSE.
      */
-    if (c->closes & CLOSES_RCVD_EOF)
+    if (c->closes & (CLOSES_RCVD_EOF | CLOSES_SENT_CLOSE))
 	return;
 
     /*
@@ -6563,7 +6601,6 @@ static void ssh2_set_window(struct ssh_channel *c, int newwin)
      */
     if ((ssh->remote_bugs & BUG_SSH2_MAXPKT) && newwin > OUR_V2_MAXPKT)
 	newwin = OUR_V2_MAXPKT;
-	
 
     /*
      * Only send a WINDOW_ADJUST if there's significantly more window
@@ -6999,7 +7036,7 @@ static void ssh2_msg_channel_close(Ssh ssh, struct Packet *pktin)
         /*
          * Send outgoing EOF.
          */
-        sshfwd_write_eof(ssh->mainchan);
+        sshfwd_write_eof(c);
     }
 
     /*