- Merged OpenBSD IPv6 patch:

   - [sshd.c sshd.8 sshconnect.c ssh.h ssh.c servconf.h servconf.c scp.1]
     [scp.c packet.h packet.c login.c log.c canohost.c channels.c]
     [hostfile.c sshd_config]
     ipv6 support: mostly gethostbyname->getaddrinfo/getnameinfo, new
     features: sshd allows multiple ListenAddress and Port options. note
     that libwrap is not IPv6-ready. (based on patches from
     fujiwara@rcac.tdi.co.jp)
   - [ssh.c canohost.c]
     more hints (hints.ai_socktype=SOCK_STREAM) for getaddrinfo,
     from itojun@
   - [channels.c]
     listen on _all_ interfaces for X11-Fwd (hints.ai_flags = AI_PASSIVE)
   - [packet.h]
     allow auth-kerberos for IPv4 only
   - [scp.1 sshd.8 servconf.h scp.c]
     document -4, -6, and 'ssh -L 2022/::1/22'
   - [ssh.c]
     'ssh @host' is illegal (null user name), from
     karsten@gedankenpolizei.de
   - [sshconnect.c]
     better error message
   - [sshd.c]
     allow auth-kerberos for IPv4 only
 - Big IPv6 merge:
   - Cleanup overrun in sockaddr copying on RHL 6.1
   - Replacements for getaddrinfo, getnameinfo, etc based on versions
     from patch from KIKUCHI Takahiro <kick@kyoto.wide.ad.jp>
   - Replacement for missing structures on systems that lack IPv6
   - record_login needed to know about AF_INET6 addresses
   - Borrowed more code from OpenBSD: rresvport_af and requisites

1 files changed, 54 insertions, 11 deletions

diff --git a/packet.c b/packet.c
index 17f6f6e3..bcd25834 100644
--- a/packet.c
+++ b/packet.c
@@ -15,7 +15,7 @@
  */
 
 #include "includes.h"
-RCSID("$Id: packet.c,v 1.8 1999/12/16 02:18:04 damien Exp $");
+RCSID("$Id: packet.c,v 1.9 2000/01/14 04:45:50 damien Exp $");
 
 #include "xmalloc.h"
 #include "buffer.h"
@@ -104,6 +104,48 @@ packet_set_connection(int fd_in, int fd_out)
 	fatal_add_cleanup((void (*) (void *)) packet_close, NULL);
 }
 
+/* Returns 1 if remote host is connected via socket, 0 if not. */
+
+int
+packet_connection_is_on_socket()
+{
+	struct sockaddr_storage from, to;
+	socklen_t fromlen, tolen;
+
+	/* filedescriptors in and out are the same, so it's a socket */
+	if (connection_in == connection_out)
+		return 1;
+	fromlen = sizeof(from);
+	memset(&from, 0, sizeof(from));
+	if (getpeername(connection_in, (struct sockaddr *) & from, &fromlen) < 0)
+		return 0;
+	tolen = sizeof(to);
+	memset(&to, 0, sizeof(to));
+	if (getsockname(connection_out, (struct sockaddr *)&to, &tolen) < 0)
+		return 0;
+	if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
+		return 0;
+	if (from.ss_family != AF_INET && from.ss_family != AF_INET6)
+		return 0;
+	return 1;
+}
+
+/* returns 1 if connection is via ipv4 */
+
+int
+packet_connection_is_ipv4()
+{
+	struct sockaddr_storage to;
+	socklen_t tolen;
+
+	memset(&to, 0, sizeof(to));
+	if (getsockname(connection_out, (struct sockaddr *)&to, &tolen) < 0)
+		return 0;
+	if (to.ss_family != AF_INET)
+		return 0;
+	return 1;
+}
+
 /* Sets the connection into non-blocking mode. */
 
 void
@@ -735,19 +777,20 @@ packet_set_interactive(int interactive, int keepalives)
 	/* Record that we are in interactive mode. */
 	interactive_mode = interactive;
 
-	/*
-	 * Only set socket options if using a socket (as indicated by the
-	 * descriptors being the same).
-	 */
-	if (connection_in != connection_out)
+	/* Only set socket options if using a socket.  */
+	if (!packet_connection_is_on_socket())
 		return;
-
 	if (keepalives) {
 		/* Set keepalives if requested. */
 		if (setsockopt(connection_in, SOL_SOCKET, SO_KEEPALIVE, (void *) &on,
-			       sizeof(on)) < 0)
+		    sizeof(on)) < 0)
 			error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
 	}
+	/*
+	 * IPTOS_LOWDELAY, TCP_NODELAY and IPTOS_THROUGHPUT are IPv4 only
+	 */
+	if (!packet_connection_is_ipv4())
+		return;
 	if (interactive) {
 		/*
 		 * Set IP options for an interactive connection.  Use
@@ -755,10 +798,10 @@ packet_set_interactive(int interactive, int keepalives)
 		 */
 		int lowdelay = IPTOS_LOWDELAY;
 		if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &lowdelay,
-			       sizeof(lowdelay)) < 0)
+		    sizeof(lowdelay)) < 0)
 			error("setsockopt IPTOS_LOWDELAY: %.100s", strerror(errno));
 		if (setsockopt(connection_in, IPPROTO_TCP, TCP_NODELAY, (void *) &on,
-			       sizeof(on)) < 0)
+		    sizeof(on)) < 0)
 			error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
 	} else {
 		/*
@@ -767,7 +810,7 @@ packet_set_interactive(int interactive, int keepalives)
 		 */
 		int throughput = IPTOS_THROUGHPUT;
 		if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &throughput,
-			       sizeof(throughput)) < 0)
+		    sizeof(throughput)) < 0)
 			error("setsockopt IPTOS_THROUGHPUT: %.100s", strerror(errno));
 	}
 }