>Number:         7965
>Category:       bin
>Synopsis:       Can't use IPv4 on ftp(1) (via ftp/http proxy) and telnet(1)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people (Utility Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 11 19:35:00 1999
>Last-Modified:
>Originator:     ITOH Yasufumi
>Organization:
	
>Release:        1.4D (June 3, 1999)
>Environment:
System: NetBSD pino.my.domain 1.4D NetBSD 1.4D (PINO) #0: Sun Jul 11 15:35:13 JST 1999 itohy@pino.my.domain:/usr/src/sys/arch/i386/compile/PINO i386


>Description:
	Can't use IPv4 address by ftp(1) (via proxy), telnet(1)
	if the kernel is build without IPv6 support (sorry :).

	The source is a little old and ignore this if already fixed.

>How-To-Repeat:
	Note that the kernel has no IPv6 support.

	% env http_proxy=http://proxy/ ftp -o foo http://www.netbsd.org/
	ftp: Can't create socket: Protocol not supported
	%
	% telnet server
	Trying c0a8:102:6963:6e6d:7039:0:7465:0...
	telnet: socket: Protocol not supported
	%

>Fix:
	This would not be a correct fix since I'm ignorant of
	IPv6 programming....

diff -uF^[a-zA-Z_][a-z 	A-Z0-9_]*(.*[^;]$ usr.bin/ftp/fetch.c.orig usr.bin/ftp/fetch.c
--- usr.bin/ftp/fetch.c.orig	Mon Jul 12 08:44:08 1999
+++ usr.bin/ftp/fetch.c	Mon Jul 12 10:31:02 1999
@@ -430,6 +430,7 @@ fetch_url(url, proxyenv, proxyauth, wwwa
 	in_port_t		portnum;
 	char			*port;
 	int			error;
+	const char		*cause;
 
 	closefunc = NULL;
 	fin = fout = NULL;
@@ -670,12 +671,12 @@ fetch_url(url, proxyenv, proxyauth, wwwa
 		if (res->ai_canonname)
 			host = res->ai_canonname;
 
-		while (1) {
+		for ( ; res; res = res->ai_next) {
 			s = socket(res->ai_family,
 				   res->ai_socktype, res->ai_protocol);
 			if (s < 0) {
-				warn("Can't create socket");
-				goto cleanup_fetch_url;
+				cause = "Can't create socket";
+				continue;
 			}
 
 			if (xconnect(s, res->ai_addr, res->ai_addrlen) < 0) {
@@ -694,12 +695,14 @@ fetch_url(url, proxyenv, proxyauth, wwwa
 						fprintf(ttyout, "Trying %s...\n", hbuf);
 					continue;
 				}
-				warn("Can't connect to %s", host);
-				goto cleanup_fetch_url;
+				cause = "Can't connect to %s";
+				resetsockbufsize();
 			}
-		
-			break;
+			goto sock_ok;
 		}
+		warn(cause, host);
+		goto cleanup_fetch_url;
+sock_ok:
 #endif
 
 
diff -uF^[a-zA-Z_][a-z 	A-Z0-9_]*(.*[^;]$ usr.bin/telnet/commands.c.orig usr.bin/telnet/commands.c
--- usr.bin/telnet/commands.c.orig	Sat Jul  3 13:04:31 1999
+++ usr.bin/telnet/commands.c	Mon Jul 12 10:37:01 1999
@@ -2307,6 +2307,11 @@ tn(argc, argv)
 	net = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 	setuid(getuid());
 	if (net < 0) {
+	    if (res->ai_next) {
+		/* probably no IPv6 support by this kernel */
+		res = res->ai_next;
+		continue;
+	    }
 	    perror("telnet: socket");
 	    return 0;
 	}
>Audit-Trail:
>Unformatted: