Add Sean Eric Fagan's support for a ~/.nofinger file for user who prefer

their privacy.
Submitted by:	sef

usr.bin/finger/finger.1

@@ -173,6 +173,12 @@ style.
 The
 .Fl l
 option is the only option that may be passed to a remote machine.
+.Pp
+If the file
+.Dq Pa .nofinger
+exists in the user's home directory,
+.Nm finger
+behaves as if the user in question does not exist.
 .Sh ENVIRONMENT
 .Nm Finger
 utilizes the following environment variable, if it exists:

usr.bin/finger/finger.c

@@ -202,6 +202,8 @@ loginlist()
 			bcopy(user.ut_name, name, UT_NAMESIZE);
 			if ((pw = getpwnam(name)) == NULL)
 				continue;
+			if (hide(pw))
+				continue;
 			pn = enter_person(pw);
 		}
 		enter_where(&user, pn);
@@ -252,18 +254,21 @@ userlist(argc, argv)
 	 */
 	if (mflag)
 		for (p = argv; *p; ++p)
-			if (pw = getpwnam(*p))
+			if ((pw = getpwnam(*p)) && !hide(pw))
 				enter_person(pw);
 			else
 				(void)fprintf(stderr,
 				    "finger: %s: no such user\n", *p);
 	else {
-		while (pw = getpwent())
+		while (pw = getpwent()) {
+			if (hide (pw))
+				continue;
 			for (p = argv, ip = used; *p; ++p, ++ip)
 				if (match(pw, *p)) {
 					enter_person(pw);
 					*ip = 1;
 				}
+		}
 		for (p = argv, ip = used; *p; ++p, ++ip)
 			if (!*ip)
 				(void)fprintf(stderr,

usr.bin/finger/util.c

@@ -200,6 +200,8 @@ PERSON *
 find_person(name)
 	char *name;
 {
+	struct passwd *pw;
+
 	register int cnt;
 	DBT data, key;
 	char buf[UT_NAMESIZE + 1];
@@ -207,6 +209,9 @@ find_person(name)
 	if (!db)
 		return(NULL);
 
+	if ((pw = getpwnam(name)) && hide(pw))
+		return(NULL);
+
 	/* Name may be only UT_NAMESIZE long and not NUL terminated. */
 	for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
 		buf[cnt] = *name;
@@ -396,3 +401,26 @@ err(fmt, va_alist)
 	exit(1);
 	/* NOTREACHED */
 }
+
+/*
+ * Is this user hiding from finger?
+ * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
+ */
+
+int
+hide(pw)
+	struct passwd *pw;
+{
+	int fd;
+	char buf[MAXPATHLEN+1];
+
+	if (!pw->pw_dir)
+		return 0;
+
+	sprintf (buf, "%s/.nofinger", pw->pw_dir);
+
+	if (access (buf, F_OK) == 0)
+		return 1;
+
+	return 0;
+}