A feature to allow one to telnet to a unix domain socket. (MFC from

non-crypto version)

Also update the crypto telnet's man page to reflect other options
ported from the non-crypto version.

Obtained from:   Lyndon Nerenberg <lyndon@orthanc.ab.ca>


git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@77095 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f

telnet/commands.c

@@ -39,6 +39,7 @@ static const char sccsid[] = "@(#)commands.c	8.4 (Berkeley) 5/30/95";
 
 #if	defined(unix)
 #include <sys/param.h>
+#include <sys/un.h>
 #if	defined(CRAY) || defined(sysV88)
 #include <sys/types.h>
 #endif
@@ -2285,6 +2286,9 @@ sockaddr_ntop(sa)
     case AF_INET:
 	addr = &((struct sockaddr_in *)sa)->sin_addr;
 	break;
+    case AF_UNIX:
+	addr = &((struct sockaddr_un *)sa)->sun_path;
+	break;
 #ifdef INET6
     case AF_INET6:
 	addr = &((struct sockaddr_in6 *)sa)->sin6_addr;
@@ -2443,7 +2447,30 @@ tn(argc, argv)
 	}
 	src_res0 = src_res;
     }
-    if (hostp[0] == '@' || hostp[0] == '!') {
+    if (hostp[0] == '/') {
+	struct sockaddr_un su;
+	
+	if (strlen(hostp) >= sizeof(su.sun_path)) {
+	    fprintf(stderr, "hostname too long for unix domain socket: %s",
+		    hostp);
+		goto fail;
+	}
+	memset(&su, 0, sizeof su);
+	su.sun_family = AF_UNIX;
+	strncpy(su.sun_path, hostp, sizeof su.sun_path);
+	printf("Trying %s...\n", &su.sun_path);
+	net = socket(PF_UNIX, SOCK_STREAM, 0);
+	if ( net < 0) {
+	    perror("socket");
+	    goto fail;
+	}
+	if (connect(net, (struct sockaddr *)&su, sizeof su) == -1) {
+	    perror(su.sun_path);
+	    (void) NetClose(net);
+	    goto fail;
+	}
+	goto af_unix;
+    } else if (hostp[0] == '@' || hostp[0] == '!') {
 	if (
 #ifdef INET6
 	    family == AF_INET6 ||
@@ -2626,6 +2653,7 @@ tn(argc, argv)
     if (src_res0 != NULL)
         freeaddrinfo(src_res0);
     cmdrc(hostp, hostname);
+ af_unix:    
     if (autologin && user == NULL) {
 	struct passwd *pw;
 

telnet/main.c

@@ -184,6 +184,9 @@ main(argc, argv)
 #undef IPSECOPT
 	{
 		switch(ch) {
+		case 'u':
+			family = AF_UNIX;
+			break;
 		case '4':
 			family = AF_INET;
 			break;

telnet/telnet.1

@@ -42,7 +42,7 @@
 protocol
 .Sh SYNOPSIS
 .Nm
-.Op Fl 8EFKLNcdfry
+.Op Fl u468EFKLNcdfry
 .Op Fl S Ar tos
 .Op Fl X Ar authtype
 .Op Fl e Ar escapechar
@@ -75,6 +75,19 @@ command with those arguments.
 .Pp
 Options:
 .Bl -tag -width indent
+.It Fl u
+Forces
+.Nm
+to use
+AF_UNIX addresses only (e.g. unix domain sockets, accessed with a file path)
+.It Fl 4
+Forces
+.Nm
+to use IPv4 addresses only.
+.It Fl 6
+Forces
+.Nm
+to use IPv6 addresses only.
 .It Fl 8
 Specifies an 8-bit data path.  This causes an attempt to
 negotiate the
@@ -191,7 +204,11 @@ This is now the default, so this option is ignored.
 Suppresses encryption of the data stream.
 .It Ar host
 Indicates the official name, an alias, or the Internet address
-of a remote host.
+of a remote host. If
+.Ar host
+starts with a /,
+.Nm
+establishes a connection to the corresponding named socket.
 .It Ar port
 Indicates a port number (address of an application).  If a number is
 not specified, the default