tlssrv: fix this mess (thanks burnzez for reporting the issue)

tlsServer() closes the passed in fd, in our case fd=1 leaving it
with no std output which got occupied by pipe() filedescriptor
which it then closed after duping... a classic.

delete all this mess. theres no reason to fork() and copy traffic
on a pipe at all as tlsServer() gives us a perfectly valid filedescriptor.
just dup() and exec() and we'r done.

sys/src/cmd/tlssrv.c

@@ -4,84 +4,9 @@
 #include <mp.h>
 #include <libsec.h>
 
-enum{ BufSize = 8192 };
+char *remotesys = "";
-
+char *logfile = nil;
-char *remotesys, *logfile;
+int debug = 0;
-int debug, p[2];
-
-void
-death(void *, char *)
-{
-	int pid;
-
-	close(0);
-	close(1);
-	close(p[1]);
-	pid = getpid();
-	postnote(PNGROUP, pid, "die");
-	postnote(PNGROUP, pid, "die");
-	postnote(PNGROUP, pid, "die");
-	_exits(0);
-}
-
-static void
-dump(int fd, uchar *buf, int n, char *label)
-{
-	Biobuf bout;
-	int i;
-
-	Binit(&bout, fd, OWRITE);
-	Bprint(&bout, "%s<%d>: ", label, n);
-	if(n > 64)
-		n = 64;
-	for(i = 0; i < n; i++)
-		Bprint(&bout, "%2.2x ", buf[i]);
-	Bprint(&bout, "\n");
-	Bterm(&bout);
-}
-
-static void
-xfer(int from, int to, int cfd, char *label)
-{
-	uchar buf[BufSize];
-	int n;
-
-	if(fork() == 0)
-		return;
-
-	close(cfd);
-	for(;;){
-		n = read(from, buf, sizeof(buf));
-		if(n <= 0){
-			fprint(2, "%s EOF\n", label);
-			close(to);
-			close(from);
-			death(nil, nil);
-		}
-		dump(2, buf, n, label);
-		n = write(to, buf, n);
-		if(n < 0){
-			fprint(2, "%s write err\n", label);
-			close(to);
-			close(from);
-			death(nil, nil);
-		}
-	}
-}
-
-static int
-dumper(int fd)
-{
-	int p[2];
-
-	if(pipe(p) < 0)
-		sysfatal("can't make pipe: %r");
-
-	xfer(fd, p[0], p[1], "read");
-	xfer(p[0], fd, p[1], "write");
-	close(p[0]);
-	return p[1];
-}
 
 static int
 reporter(char *fmt, ...)
@@ -114,14 +39,10 @@ void
 main(int argc, char *argv[])
 {
 	TLSconn *conn;
-	uchar buf[BufSize];
 	char *cert;
-	int n, fd, clearfd;
+	int fd;
 
-	debug = 0;
-	remotesys = nil;
 	cert = nil;
-	logfile = nil;
 	ARGBEGIN{
 	case 'D':
 		debug++;
@@ -141,76 +62,33 @@ main(int argc, char *argv[])
 
 	if(cert == nil)
 		sysfatal("no certificate specified");
-	if(remotesys == nil)
-		remotesys = "";
 	conn = (TLSconn*)mallocz(sizeof *conn, 1);
 	if(conn == nil)
 		sysfatal("out of memory");
 	conn->chain = readcertchain(cert);
 	if(conn->chain == nil)
-		sysfatal("can't read certificate");
+		sysfatal("can't read certificate %s", cert);
 	conn->cert = conn->chain->pem;
 	conn->certlen = conn->chain->pemlen;
 	conn->chain = conn->chain->next;
 	if(debug)
 		conn->trace = reporter;
 
-	clearfd = 0;
+	fd = tlsServer(1, conn);
-	fd = 1;
-	if(debug > 1)
-		fd = dumper(fd);
-	fd = tlsServer(fd, conn);
 	if(fd < 0){
 		reporter("failed: %r");
 		exits(0);
 	}
-	reporter("open");
+	if(debug)
+		reporter("open");
 
-	if(argc > 0){
+	dup(fd, 0);
-		if(pipe(p) < 0)
+	dup(fd, 1);
-			exits("pipe");
-		switch(fork()){
-		case 0:
-			close(fd);
-			dup(p[0], 0);
-			dup(p[0], 1);
-			close(p[1]);
-			close(p[0]);
-			exec(argv[0], argv);
-			reporter("can't exec %s: %r", argv[0]);
-			_exits("exec");
-		case -1:
-			exits("fork");
-		default:
-			close(p[0]);
-			clearfd = p[1];
-			break;
-		}
-	}
 
-	rfork(RFNOTEG);
+	if(*argv == nil)
-	notify(death);
+		*--argv = "/bin/cat";
-	switch(rfork(RFPROC)){
+
-	case -1:
+	exec(*argv, argv);
-		sysfatal("can't fork");
+	reporter("can't exec %s: %r", *argv);
-	case 0:
+	exits("exec");
-		for(;;){
-			n = read(clearfd, buf, BufSize);
-			if(n <= 0)
-				break;
-			if(write(fd, buf, n) != n)
-				break;
-		}
-		break;
-	default:
-		for(;;){
-			n = read(fd, buf, BufSize);
-			if(n <= 0)
-				break;
-			if(write(clearfd, buf, n) != n)
-				break;
-		}
-		break;
-	}
-	death(nil, nil);
 }