Merge from non-crypto version:

- "-N" option
- "-E" security fix
- "-s src_addr" option

Requested by:	markm


git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@47973 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f

telnet/commands.c

@@ -1125,7 +1125,7 @@ unsetcmd(argc, argv)
 #ifdef	KLUDGELINEMODE
 extern int kludgelinemode;
 
-    static void
+    static int
 dokludgemode()
 {
     kludgelinemode = 1;
@@ -2277,7 +2277,7 @@ tn(argc, argv)
     char *argv[];
 {
     register struct hostent *host = 0;
-    struct sockaddr_in sin;
+    struct sockaddr_in sin, src_sin;
     struct servent *sp = 0;
     unsigned long temp;
     extern char *inet_ntoa();
@@ -2286,6 +2286,7 @@ tn(argc, argv)
     unsigned long sourceroute(), srlen;
 #endif
     char *cmd, *hostp = 0, *portp = 0, *user = 0;
+    char *src_addr = NULL;
 
     /* clear the socket address prior to use */
     memset((char *)&sin, 0, sizeof(sin));
@@ -2321,6 +2322,14 @@ tn(argc, argv)
 	    autologin = 1;
 	    continue;
 	}
+	if (strcmp(*argv, "-s") == 0) {
+	    --argc; ++argv;
+	    if (argc == 0)
+		goto usage;
+	    src_addr = *argv++;
+	    --argc;
+	    continue;
+	}
 	if (hostp == 0) {
 	    hostp = *argv++;
 	    --argc;
@@ -2332,13 +2341,31 @@ tn(argc, argv)
 	    continue;
 	}
     usage:
-	printf("usage: %s [-l user] [-a] host-name [port]\n", cmd);
+	printf("usage: %s [-l user] [-a] [-s src_addr] host-name [port]\n", cmd);
 	setuid(getuid());
 	return 0;
     }
     if (hostp == 0)
 	goto usage;
 
+    if (src_addr != NULL) {
+	bzero((char *)&src_sin, sizeof(src_sin));
+	src_sin.sin_family = AF_INET;
+	if (!inet_aton(src_addr, &src_sin.sin_addr)) {
+	    host = gethostbyname2(src_addr, AF_INET);
+	    if (host == NULL) {
+		herror(src_addr);
+		return 0;
+	    }
+	    if (host->h_length != sizeof(src_sin.sin_addr)) {
+		fprintf(stderr, "telnet: gethostbyname2: invalid address\n");
+		return 0;
+	    }
+	    memcpy((void *)&src_sin.sin_addr, (void *)host->h_addr_list[0],
+			sizeof(src_sin.sin_addr));
+	}
+    }
+
 #if	defined(IP_OPTIONS) && defined(IPPROTO_IP)
     if (hostp[0] == '@' || hostp[0] == '!') {
 	if ((hostname = strrchr(hostp, ':')) == NULL)
@@ -2364,7 +2391,8 @@ tn(argc, argv)
  	if (temp != INADDR_NONE) {
 	    sin.sin_addr.s_addr = temp;
 	    sin.sin_family = AF_INET;
- 	    host = gethostbyaddr((char *)&temp, sizeof(temp), AF_INET);
+	    if (doaddrlookup)
+		host = gethostbyaddr((char *)&temp, sizeof(temp), AF_INET);
  	    if (host)
  	        (void) strncpy(_hostname, host->h_name, sizeof(_hostname));
  	    else
@@ -2460,6 +2488,13 @@ tn(argc, argv)
 		perror("setsockopt (SO_DEBUG)");
 	}
 
+	if (src_addr != NULL) {
+	    if (bind(net, (struct sockaddr *)&src_sin, sizeof(src_sin)) == -1) {
+		perror("bind");
+		return 0;
+	    }
+	}
+
 	if (connect(net, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
 #if	defined(h_addr)		/* In 4.3, this is a #define */
 	    if (host && host->h_addr_list[1]) {

telnet/externs.h

@@ -146,6 +146,7 @@ extern int
     termdata,		/* Print out terminal data flow */
 #endif	/* defined(unix) */
     debug,		/* Debug level */
+    doaddrlookup,	/* do a reverse lookup? */
     clienteof;		/* Client received EOF */
 
 extern cc_t escape;	/* Escape to command mode */

telnet/main.c

@@ -95,20 +95,22 @@ usage()
 	fprintf(stderr, "Usage: %s %s%s%s%s\n",
 	    prompt,
 #ifdef	AUTHENTICATION
-	    "[-8] [-E] [-K] [-L] [-S tos] [-X atype] [-a] [-c] [-d] [-e char]",
+	    "[-8] [-E] [-K] [-L] [-N] [-S tos] [-X atype] [-a] [-c] [-d]",
-	    "\n\t[-k realm] [-l user] [-f/-F] [-n tracefile] ",
+	    "\n\t[-e char] [-k realm] [-l user] [-f/-F] [-n tracefile] ",
 #else
-	    "[-8] [-E] [-L] [-S tos] [-a] [-c] [-d] [-e char] [-l user]",
+	    "[-8] [-E] [-L] [-N] [-S tos] [-a] [-c] [-d] [-e char] [-l user]",
-	    "\n\t[-n tracefile]",
+	    "\n\t[-n tracefile] ",
 #endif
 #if defined(TN3270) && defined(unix)
 # ifdef AUTHENTICATION
-	    "[-noasynch] [-noasynctty]\n\t[-noasyncnet] [-r] [-t transcom] ",
+	    "[-noasynch] [-noasynctty]\n\t"
+	    "[-noasyncnet] [-r] [-s src_addr] [-t transcom] ",
 # else
-	    "[-noasynch] [-noasynctty] [-noasyncnet] [-r]\n\t[-t transcom]",
+	    "[-noasynch] [-noasynctty] [-noasyncnet] [-r]\n\t"
+	    "[-s src_addr] [-t transcom]",
 # endif
 #else
-	    "[-r] ",
+	    "[-r] [-s src_addr] ",
 #endif
 #ifdef	ENCRYPTION
 	    "[-x] [host-name [port]]"
@@ -132,6 +134,7 @@ main(argc, argv)
 	extern int optind;
 	int ch;
 	char *user, *strrchr();
+	char *src_addr = NULL;
 #ifdef	FORWARD
 	extern int forward_flags;
 #endif	/* FORWARD */
@@ -153,7 +156,7 @@ main(argc, argv)
 	rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 	autologin = -1;
 
-	while ((ch = getopt(argc, argv, "8EKLS:X:acde:fFk:l:n:rt:x")) != EOF) {
+	while ((ch = getopt(argc, argv, "8EKLNS:X:acde:fFk:l:n:rs:t:x")) != EOF) {
 		switch(ch) {
 		case '8':
 			eight = 3;	/* binary output and input */
@@ -169,6 +172,9 @@ main(argc, argv)
 		case 'L':
 			eight |= 2;	/* binary output only */
 			break;
+		case 'N':
+			doaddrlookup = 0;
+			break;
 		case 'S':
 		    {
 #ifdef	HAS_GETTOS
@@ -270,6 +276,9 @@ main(argc, argv)
 		case 'r':
 			rlogin = '~';
 			break;
+		case 's':
+			src_addr = optarg;
+			break;
 		case 't':
 #if defined(TN3270) && defined(unix)
 			transcom = tline;
@@ -303,7 +312,7 @@ main(argc, argv)
 	argv += optind;
 
 	if (argc) {
-		char *args[7], **argp = args;
+		char *args[9], **argp = args;
 
 		if (argc > 2)
 			usage();
@@ -312,6 +321,10 @@ main(argc, argv)
 			*argp++ = "-l";
 			*argp++ = user;
 		}
+		if (src_addr) {
+			*argp++ = "-s";
+			*argp++ = src_addr;
+		}
 		*argp++ = argv[0];		/* host */
 		if (argc > 1)
 			*argp++ = argv[1];	/* port */

telnet/telnet.1

@@ -41,13 +41,14 @@
 protocol
 .Sh SYNOPSIS
 .Nm telnet
-.Op Fl 8EFKLacdfrx
+.Op Fl 8EFKLNacdfrx
 .Op Fl S Ar tos
 .Op Fl X Ar authtype
 .Op Fl e Ar escapechar
 .Op Fl k Ar realm
 .Op Fl l Ar user
 .Op Fl n Ar tracefile
+.Op Fl s Ar src_addr
 .Oo
 .Ar host
 .Op port
@@ -91,6 +92,9 @@ Specifies no automatic login to the remote system.
 .It Fl L
 Specifies an 8-bit data path on output.  This causes the
 BINARY option to be negotiated on output.
+.It Fl N
+Prevents IP address to name lookup when destination host is given
+as an IP address.
 .It Fl S Ar tos
 Sets the IP type-of-service (TOS) option for the telnet
 connection to the value
@@ -173,6 +177,12 @@ Specifies a user interface similar to
 In this
 mode, the escape character is set to the tilde (~) character,
 unless modified by the -e option.
+.It Fl s Ar src_addr
+Set the source IP address for the
+.Nm
+connection to
+.Ar src_addr ,
+which can be an IP address or a host name.
 .It Fl x
 Turns on encryption of the data stream if possible.  This
 option is not available outside of the United States and

telnet/telnet.c

@@ -116,6 +116,7 @@ int
 	donebinarytoggle,	/* the user has put us in binary */
 	dontlecho,	/* do we suppress local echoing right now? */
 	globalmode,
+	doaddrlookup = 1, /* do a reverse address lookup? */
 	clienteof = 0;
 
 char *prompt = 0;
@@ -2083,7 +2084,7 @@ telsnd()
 		}
 		if ((sc == '\n') || (sc == '\r'))
 			bol = 1;
-	} else if (sc == escape) {
+	} else if (escape != _POSIX_VDISABLE && sc == escape) {
 	    /*
 	     * Double escape is a pass through of a single escape character.
 	     */