telnet(1): add quiet mode ("telnet -Q")

Reviewed By:	imp, phk
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
X-NetApp-PR:	#54
Differential Revision:	https://reviews.freebsd.org/D30819

3 files changed, 25 insertions, 8 deletions

diff --git a/contrib/telnet/telnet/commands.c b/contrib/telnet/telnet/commands.c
index 21e973209d9b..c52af2a81a67 100644
--- a/contrib/telnet/telnet/commands.c
+++ b/contrib/telnet/telnet/commands.c
@@ -122,6 +122,7 @@ static char line[256];
 static char saveline[256];
 static int margc;
 static char *margv[20];
+int quiet_mode;
 
 #ifdef OPIE
 #include <sys/wait.h>
@@ -2042,7 +2043,8 @@ static int
 status(int argc, char *argv[])
 {
     if (connected) {
-	printf("Connected to %s.\n", hostname);
+	if (!quiet_mode)
+		printf("Connected to %s.\n", hostname);
 	if ((argc < 2) || strcmp(argv[1], "notmuch")) {
 	    int mode = getconnmode();
 
@@ -2071,7 +2073,8 @@ status(int argc, char *argv[])
     } else {
 	printf("No connection.\n");
     }
-    printf("Escape character is '%s'.\n", control(escape));
+    if (!quiet_mode)
+	printf("Escape character is '%s'.\n", control(escape));
     (void) fflush(stdout);
     return 1;
 }
@@ -2264,7 +2267,8 @@ tn(int argc, char *argv[])
 	memset(&su, 0, sizeof su);
 	su.sun_family = AF_UNIX;
 	strncpy(su.sun_path, hostp, sizeof su.sun_path);
-	printf("Trying %s...\n", hostp);
+	if (!quiet_mode)
+	    printf("Trying %s...\n", hostp);
 	net = socket(PF_UNIX, SOCK_STREAM, 0);
 	if ( net < 0) {
 	    perror("socket");
@@ -2373,7 +2377,8 @@ tn(int argc, char *argv[])
 	}
     }
     do {
-        printf("Trying %s...\n", sockaddr_ntop(res->ai_addr));
+	if (!quiet_mode)
+            printf("Trying %s...\n", sockaddr_ntop(res->ai_addr));
 	net = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 	setuid(getuid());
 	if (net < 0) {
@@ -2491,7 +2496,10 @@ tn(int argc, char *argv[])
     (void) call(status, "status", "notmuch", 0);
     telnet(user); 
     (void) NetClose(net);
-    ExitString("Connection closed by foreign host.\n",1);
+    if (quiet_mode)
+        ExitString("",1);
+    else
+        ExitString("Connection closed by foreign host.\n",1);
     /*NOTREACHED*/
  fail:
     if (res0 != NULL)
diff --git a/contrib/telnet/telnet/main.c b/contrib/telnet/telnet/main.c
index befb3eecee66..8ebcc0a86259 100644
--- a/contrib/telnet/telnet/main.c
+++ b/contrib/telnet/telnet/main.c
@@ -63,6 +63,7 @@ char *ipsec_policy_out = NULL;
 #endif
 
 extern int tos;
+extern int quiet_mode;
 
 int family = AF_UNSPEC;
 
@@ -152,7 +153,7 @@ main(int argc, char *argv[])
 #define IPSECOPT
 #endif
 	while ((ch = getopt(argc, argv,
-			    "468B:EKLNS:X:acde:fFk:l:n:rs:uxy" IPSECOPT)) != -1)
+			    "468B:EKLNQS:X:acde:fFk:l:n:rs:uxy" IPSECOPT)) != -1)
 #undef IPSECOPT
 	{
 		switch(ch) {
@@ -184,6 +185,9 @@ main(int argc, char *argv[])
 		case 'N':
 			doaddrlookup = 0;
 			break;
+		case 'Q':
+			quiet_mode = 1;
+			break;
 		case 'S':
 #ifdef	HAS_GETTOS
 
diff --git a/contrib/telnet/telnet/telnet.1 b/contrib/telnet/telnet/telnet.1
index b7004ee94a5d..015401030f23 100644
--- a/contrib/telnet/telnet/telnet.1
+++ b/contrib/telnet/telnet/telnet.1
@@ -28,7 +28,7 @@
 .\"	@(#)telnet.1	8.6 (Berkeley) 6/1/94
 .\" $FreeBSD$
 .\"
-.Dd August 7, 2020
+.Dd June 21, 2021
 .Dt TELNET 1
 .Os
 .Sh NAME
@@ -38,7 +38,7 @@
 protocol
 .Sh SYNOPSIS
 .Nm
-.Op Fl 468EFKLNacdfruxy
+.Op Fl 468EFKLNQacdfruxy
 .Op Fl B Ar baudrate
 .Op Fl S Ar tos
 .Op Fl X Ar authtype
@@ -108,6 +108,11 @@ 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 Q
+Quiet mode.
+This suppresses the messages
+.Nm
+would normally output upon connecting or disconnecting.
 .It Fl S Ar tos
 Sets the IP type-of-service (TOS) option for the telnet
 connection to the value