propagate from branch 'au.asn.ucc.matt.dropbear' (head b1dd3b94e60a07a176dba2b035ac79968595990a)

            to branch 'au.asn.ucc.matt.dropbear.channel-fix' (head fc77c3dea87a7c0f374e738d055f0b455495cbc3)

--HG--
branch : channel-fix
extra : convert_revision : dec459c955c306f9ecddc3b4e04a963f3f264a0f

channel.h

@@ -73,10 +73,9 @@ struct Channel {
 	circbuffer *extrabuf; /* extended-data for the program - used like writebuf
 					     but for stderr */
 
-	int sentclosed, recvclosed;
-
-	/* this is set when we receive/send a channel eof packet */
-	int recveof, senteof;
+	/* whether close/eof messages have been exchanged */
+	int sent_close, recv_close;
+	int recv_eof, sent_eof;
 
 	int initconn; /* used for TCP forwarding, whether the channel has been
 					 fully initialised */
@@ -94,7 +93,7 @@ struct ChanType {
 	int sepfds; /* Whether this channel has seperate pipes for in/out or not */
 	char *name;
 	int (*inithandler)(struct Channel*);
-	int (*checkclose)(struct Channel*);
+	int (*check_close)(struct Channel*);
 	void (*reqhandler)(struct Channel*);
 	void (*closehandler)(struct Channel*);
 

cli-channel.c

@@ -39,9 +39,6 @@ void recv_msg_channel_extended_data() {
 	TRACE(("enter recv_msg_channel_extended_data"))
 
 	channel = getchannel();
-	if (channel == NULL) {
-		dropbear_exit("Unknown channel");
-	}
 
 	if (channel->type != &clichansess) {
 		TRACE(("leave recv_msg_channel_extended_data: chantype is wrong"))

common-session.c

@@ -143,27 +143,21 @@ void session_loop(void(*loophandler)()) {
 			dropbear_exit("Terminated by signal");
 		}
 		
-		if (val < 0) {
-			if (errno == EINTR) {
-				/* This must happen even if we've been interrupted, so that
-				 * changed signal-handler vars can take effect etc */
-				if (loophandler) {
-					loophandler();
-				}
-				continue;
-			} else {
-				dropbear_exit("Error in select");
-			}
+		if (val < 0 && errno != EINTR) {
+			dropbear_exit("Error in select");
+		}
+
+		if (val <= 0) {
+			/* If we were interrupted or the select timed out, we still
+			 * want to iterate over channels etc for reading, to handle
+			 * server processes exiting etc. 
+			 * We don't want to read/write FDs. */
+			FD_ZERO(&writefd);
+			FD_ZERO(&readfd);
 		}
 
 		/* check for auth timeout, rekeying required etc */
 		checktimeouts();
-		
-		if (val == 0) {
-			/* timeout */
-			TRACE(("select timeout"))
-			continue;
-		}
 
 		/* process session socket's incoming/outgoing data */
 		if (ses.sock != -1) {

debug.h

@@ -39,7 +39,7 @@
  * Caution: Don't use this in an unfriendly environment (ie unfirewalled),
  * since the printing may not sanitise strings etc. This will add a reasonable
  * amount to your executable size. */
-/*#define DEBUG_TRACE */
+#define DEBUG_TRACE
 
 /* All functions writing to the cleartext payload buffer call
  * CHECKCLEARTOWRITE() before writing. This is only really useful if you're

svr-chansession.c

@@ -59,7 +59,6 @@ static void send_msg_chansess_exitstatus(struct Channel * channel,
 		struct ChanSess * chansess);
 static void send_msg_chansess_exitsignal(struct Channel * channel,
 		struct ChanSess * chansess);
-static int sesscheckclose(struct Channel *channel);
 static void get_termmodes(struct ChanSess *chansess);
 
 
@@ -68,7 +67,7 @@ extern char** environ;
 
 static int sesscheckclose(struct Channel *channel) {
 	struct ChanSess *chansess = (struct ChanSess*)channel->typedata;
-	return chansess->exit.exitpid >= 0;
+	return chansess->exit.exitpid != -1;
 }
 
 /* Handler for childs exiting, store the state for return to the client */