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Hideaki YOSHIFUJI

2000-Mar-07 16:00 UTC

patch for openssh-1.2.2p1

Hi,

openssh-1.2.2p1 seems to have 2 problems on ipv6 (and
ipv4 mapped addresses).

 1. "BREAKIN ATTEMPT" warnings from ipv4 node
 2. X forwarding

The following patche fixes them.
Thanks.

diff -ru openssh-1.2.2p1/canohost.c openssh-1.2.2p1-20000308/canohost.c
--- openssh-1.2.2p1/canohost.c	Fri Jan 14 13:45:48 2000
+++ openssh-1.2.2p1-20000308/canohost.c	Wed Mar  8 00:25:18 2000
@@ -42,6 +42,22 @@
 		debug("getpeername failed: %.100s", strerror(errno));
 		fatal_cleanup();
 	}
+
+#ifdef IPV4_IN_IPV6
+	if (((struct sockaddr *)&from)->sa_family == AF_INET6 &&
+	    IN6_IS_ADDR_V4MAPPED((&((struct sockaddr_in6
*)&from)->sin6_addr))){
+		struct in_addr addr;
+		u_int16_t port;
+		memcpy(&addr, ((char *)&((struct sockaddr_in6
*)&from)->sin6_addr)+12,
+		       sizeof(addr));
+		port = ((struct sockaddr_in6 *)&from)->sin6_port;
+		memset(&from, 0, sizeof(from));
+		((struct sockaddr_in *)&from)->sin_family = AF_INET;
+		memcpy(&((struct sockaddr_in *)&from)->sin_addr, &addr,
sizeof(addr));
+		((struct sockaddr_in *)&from)->sin_port = port;
+	}
+#endif
+
 	if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
 	     NULL, 0, NI_NUMERICHOST) != 0)
 		fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed");
diff -ru openssh-1.2.2p1/channels.c openssh-1.2.2p1-20000308/channels.c
--- openssh-1.2.2p1/channels.c	Fri Mar  3 20:35:33 2000
+++ openssh-1.2.2p1-20000308/channels.c	Wed Mar  8 00:25:18 2000
@@ -1215,8 +1215,12 @@
 				break;
 			}
 			socks[num_socks++] = sock;
+#ifndef DONT_TRY_OTHER_AF
 			if (num_socks == NUM_SOCKS)
 				break;
+#else
+			break;
+#endif
 		}
 		if (num_socks > 0)
 			break;
diff -ru openssh-1.2.2p1/config.h.in openssh-1.2.2p1-20000308/config.h.in
--- openssh-1.2.2p1/config.h.in	Tue Mar  7 20:05:59 2000
+++ openssh-1.2.2p1-20000308/config.h.in	Wed Mar  8 00:25:18 2000
@@ -131,6 +131,9 @@
 /* Use IPv4 for connection by default, IPv6 can still if explicity asked */
 #undef IPV4_DEFAULT
 
+/* Assume IPv4 mapped addresses IPv4 addresses */
+#undef IPV4_IN_IPV6
+
 /* getaddrinfo is broken (if present) */
 #undef BROKEN_GETADDRINFO
 
diff -ru openssh-1.2.2p1/configure.in openssh-1.2.2p1-20000308/configure.in
--- openssh-1.2.2p1/configure.in	Sun Mar  5 15:02:46 2000
+++ openssh-1.2.2p1-20000308/configure.in	Wed Mar  8 00:26:15 2000
@@ -56,6 +56,8 @@
 *-*-linux*)
 	no_dev_ptmx=1
 	need_pty_removed_on_close=1
+	CFLAGS="$CFLAGS -DDONT_TRY_OTHER_AF"
+	inet6_default_4in6=yes
 	;;
 *-*-netbsd*)
 	need_dash_r=1
@@ -778,6 +780,26 @@
 	[
 		if test "x$withval" != "xno" ; then	
 			AC_DEFINE(IPV4_DEFAULT)
+		fi
+	]
+)
+
+AC_MSG_CHECKING([whether we assume IPv6-mapped addresses IPv4 addresses])
+AC_ARG_WITH(ipv4-in-ipv6,
+	[  --with-ipv4-in-ipv6     assumes ipv4 mapped addresses ipv4 addresses],
+	[
+		if test "x$withval" != "xno" ; then
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(IPV4_IN_IPV6)
+		else
+			AC_MSG_RESULT(no)
+		fi
+	],[
+		if test "x$inet6_default_4in6" = "xyes"; then
+			AC_MSG_RESULT([yes (default)])
+			AC_DEFINE(IPV4_IN_IPV6)
+		else
+			AC_MSG_RESULT([no (default)])
 		fi
 	]
 )

-- 
Hideaki YOSHIFUJI <yoshfuji at ecei.tohoku.ac.jp>
Web Page: http://www.ecei.tohoku.ac.jp/%7Eyoshfuji/
PGP5i FP: F731 6599 5EB2 BBA7 1515  1323 1806 A96F 5700 6B25

Ben Lindstrom

2000-Mar-09 07:01 UTC

head link

sigsuspend() replacement

Anyone want to provide me with better detailed information as to what
sigsuspend() really does.  It seems to be linked to Ctrl-Z.  Since Ctrl-Z
at the password prompt does not re-enable shell echoing.  

thanks.

Damien Miller

2000-Mar-11 09:40 UTC

head link

patch for openssh-1.2.2p1

On Wed, 8 Mar 2000, Hideaki YOSHIFUJI wrote:
> Hi,
> 
> openssh-1.2.2p1 seems to have 2 problems on ipv6 (and
> ipv4 mapped addresses).
> 
>  1. "BREAKIN ATTEMPT" warnings from ipv4 node
>  2. X forwarding
How does this patch look to you?

Regards,
Damien Miller

--
| "Bombay is 250ms from New York in the new world order" - Alan Cox
| Damien Miller - http://www.mindrot.org/
| Email: djm at mindrot.org (home) -or- djm at ibs.com.au (work)


-------------- next part --------------
Index: acconfig.h
==================================================================RCS file:
/var/cvs/openssh/acconfig.h,v
retrieving revision 1.53
diff -u -r1.53 acconfig.h
--- acconfig.h	2000/03/09 11:31:13	1.53
+++ acconfig.h	2000/03/11 09:38:46
@@ -153,6 +153,12 @@
 /* getaddrinfo is broken (if present) */
 #undef BROKEN_GETADDRINFO
 
+/* Workaround more Linux IPv6 bugs */
+#undef DONT_TRY_OTHER_AF
+
+/* Detect IPv4 in IPv6 mapped addresses and treat as IPv4 */
+#undef IPV4_IN_IPV6
+
 @BOTTOM@
 
 /* ******************* Shouldn't need to edit below this line
************** */
Index: canohost.c
==================================================================RCS file:
/var/cvs/openssh/canohost.c,v
retrieving revision 1.7
diff -u -r1.7 canohost.c
--- canohost.c	2000/01/14 04:45:48	1.7
+++ canohost.c	2000/03/11 09:38:49
@@ -42,6 +42,30 @@
 		debug("getpeername failed: %.100s", strerror(errno));
 		fatal_cleanup();
 	}
+
+#ifdef IPV4_IN_IPV6
+	if (from.ss_family == AF_INET6) {
+		struct sockaddr_in6 *from6 = (struct sockaddr_in6 *)&from;
+
+		/* Detect IPv4 in IPv6 mapped address and convert it to */
+		/* plain (AF_INET) IPv4 address */
+		if (IN6_IS_ADDR_V4MAPPED(&from6->sin6_addr)) {
+			struct sockaddr_in *from4 = (struct sockaddr_in *)&from;
+			struct in_addr addr;
+			u_int16_t port;
+
+			memcpy(&addr, ((char *)&from6->sin6_addr) + 12, sizeof(addr));
+			port = from6->sin6_port;
+
+			memset(&from, 0, sizeof(from));
+			
+			from4->sin_family = AF_INET;
+			memcpy(&from4->sin_addr, &addr, sizeof(addr));
+			from4->sin_port = port;
+		}
+	}
+#endif
+
 	if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
 	     NULL, 0, NI_NUMERICHOST) != 0)
 		fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed");
Index: channels.c
==================================================================RCS file:
/var/cvs/openssh/channels.c,v
retrieving revision 1.17
diff -u -r1.17 channels.c
--- channels.c	2000/03/03 11:35:33	1.17
+++ channels.c	2000/03/11 09:39:12
@@ -1215,8 +1215,12 @@
 				break;
 			}
 			socks[num_socks++] = sock;
+#ifndef DONT_TRY_OTHER_AF
 			if (num_socks == NUM_SOCKS)
 				break;
+#else
+			break;
+#endif
 		}
 		if (num_socks > 0)
 			break;
Index: configure.in
==================================================================RCS file:
/var/cvs/openssh/configure.in,v
retrieving revision 1.93
diff -u -r1.93 configure.in
--- configure.in	2000/03/11 09:05:12	1.93
+++ configure.in	2000/03/11 09:39:22
@@ -55,6 +55,8 @@
 	;;
 *-*-linux*)
 	no_dev_ptmx=1
+	AC_DEFINE(DONT_TRY_OTHER_AF)
+	inet6_default_4in6=yes
 	;;
 *-*-netbsd*)
 	need_dash_r=1
@@ -784,6 +786,26 @@
 	[
 		if test "x$withval" != "xno" ; then	
 			AC_DEFINE(IPV4_DEFAULT)
+		fi
+	]
+)
+
+AC_MSG_CHECKING([to convert IPv4 in IPv6-mapped addresses])
+AC_ARG_WITH(4in6,
+	[  --with-4in6             Check for and convert IPv4 in IPv6 mapped
addresses],
+	[
+		if test "x$withval" != "xno" ; then
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(IPV4_IN_IPV6)
+		else
+			AC_MSG_RESULT(no)
+		fi
+	],[
+		if test "x$inet6_default_4in6" = "xyes"; then
+			AC_MSG_RESULT([yes (default)])
+			AC_DEFINE(IPV4_IN_IPV6)
+		else
+			AC_MSG_RESULT([no (default)])
 		fi
 	]
 )

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