BSD 4_4 release

[unix-history] / usr / src / usr.bin / talk / get_names.c

diff --git a/usr/src/usr.bin/talk/get_names.c b/usr/src/usr.bin/talk/get_names.c
index 71dd4b7..9d3cc04 100644 (file)
--- a/usr/src/usr.bin/talk/get_names.c
+++ b/usr/src/usr.bin/talk/get_names.c
@@ -1,103 +1,118 @@
-/* $Header: get_names.c 1.2 83/03/26 14:35:54 moore Exp $ */
+/*
+ * Copyright (c) 1983, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */

 
 

-#include "talk.h"
-#include "ctl.h"
+#ifndef lint
+static char sccsid[] = "@(#)get_names.c        8.1 (Berkeley) 6/6/93";
+#endif /* not lint */

 
 

-char *getlogin(), *ttyname(), *rindex();
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <protocols/talkd.h>
+#include <pwd.h>
+#include "talk.h"

 
 

-extern CTL_MSG msg;
+char   *getlogin();
+char   *ttyname();
+char   *rindex();
+extern CTL_MSG msg;

 
 /*
  * Determine the local and remote user, tty, and machines
  */
 
 /*
  * Determine the local and remote user, tty, and machines
  */

-
-struct hostent *gethostbyname();
-

 get_names(argc, argv)
 get_names(argc, argv)

-int argc;
-char *argv[];
+       int argc;
+       char *argv[];

 {
 {

-    char hostname[HOST_NAME_LENGTH];
-    char *his_name;
-    char *my_name;
-    char *my_machine_name;
-    char *his_machine_name;
-    char *my_tty;
-    char *his_tty;
-    char *ptr;
-    int name_length;
-
-    if (argc < 2 ) {
-       printf("Usage:  talk user [ttyname]\n");
-       exit(-1);
-    }
-    if ( !isatty(0) ) {
-       printf("Standard input must be a tty, not a pipe or a file\n");
-       exit(-1);
-    }
-
-    my_name = getlogin();
-    if (my_name == NULL) {
-       printf("You don't exist. Go away.\n");
-       exit(-1);
-    }
-
-    name_length = HOST_NAME_LENGTH;
-    gethostname(hostname, &name_length);
-    my_machine_name = hostname;
-
-    my_tty = rindex(ttyname(0), '/') + 1;
-
-       /* check for, and strip out, the machine name 
-           of the target */
-
-    for (ptr = argv[1]; *ptr != '\0' &&
-                        *ptr != '@' &&
-                        *ptr != ':' &&
-                        *ptr != '!' &&
-                        *ptr != '.'     ; ptr++) {
-    }
-
-    if (*ptr == '\0') {
-
-           /* this is a local to local talk */
-
-       his_name = argv[1];
-       his_machine_name = my_machine_name;
-
-    } else {
-
-       if (*ptr == '@') {
-               /* user@host */
-           his_name = argv[1];
-           his_machine_name = ptr + 1;
+       char hostname[MAXHOSTNAMELEN];
+       char *his_name, *my_name;
+       char *my_machine_name, *his_machine_name;
+       char *my_tty, *his_tty;
+       register char *cp;
+
+       if (argc < 2 ) {
+               printf("Usage: talk user [ttyname]\n");
+               exit(-1);
+       }
+       if (!isatty(0)) {
+               printf("Standard input must be a tty, not a pipe or a file\n");
+               exit(-1);
+       }
+       if ((my_name = getlogin()) == NULL) {
+               struct passwd *pw;
+
+               if ((pw = getpwuid(getuid())) == NULL) {
+                       printf("You don't exist. Go away.\n");
+                       exit(-1);
+               }
+               my_name = pw->pw_name;
+       }
+       gethostname(hostname, sizeof (hostname));
+       my_machine_name = hostname;
+       /* check for, and strip out, the machine name of the target */
+       for (cp = argv[1]; *cp && !index("@:!.", *cp); cp++)
+               ;
+       if (*cp == '\0') {
+               /* this is a local to local talk */
+               his_name = argv[1];
+               his_machine_name = my_machine_name;

        } else {
        } else {

-               /* host.user or host!user or host:user */
-           his_name = ptr + 1;
-           his_machine_name = argv[1];
+               if (*cp++ == '@') {
+                       /* user@host */
+                       his_name = argv[1];
+                       his_machine_name = cp;
+               } else {
+                       /* host.user or host!user or host:user */
+                       his_name = cp;
+                       his_machine_name = argv[1];
+               }
+               *--cp = '\0';

        }
        }

-       *ptr = '\0';
-    }
-
-
-    if (argc > 2) {
-       his_tty = argv[2];      /* tty name is arg 2 */
-    } else {
-       his_tty = (char *) 0;
-    }
-
-    get_addrs(my_machine_name, his_machine_name);
-
-       /* Load these useful values into the standard message header */
-
-    msg.id_num = 0;
-
-    strncpy(msg.l_name, my_name, NAME_SIZE);
-    msg.l_name[NAME_SIZE - 1] = '\0';
-
-    strncpy(msg.r_name, his_name, NAME_SIZE);
-    msg.r_name[NAME_SIZE - 1] = '\0';
-
-    strncpy(msg.r_tty, his_tty, TTY_SIZE);
-    msg.r_tty[TTY_SIZE - 1] = '\0';
+       if (argc > 2)
+               his_tty = argv[2];      /* tty name is arg 2 */
+       else
+               his_tty = "";
+       get_addrs(my_machine_name, his_machine_name);
+       /*
+        * Initialize the message template.
+        */
+       msg.vers = TALK_VERSION;
+       msg.addr.sa_family = htons(AF_INET);
+       msg.ctl_addr.sa_family = htons(AF_INET);
+       msg.id_num = htonl(0);
+       strncpy(msg.l_name, my_name, NAME_SIZE);
+       msg.l_name[NAME_SIZE - 1] = '\0';
+       strncpy(msg.r_name, his_name, NAME_SIZE);
+       msg.r_name[NAME_SIZE - 1] = '\0';
+       strncpy(msg.r_tty, his_tty, TTY_SIZE);
+       msg.r_tty[TTY_SIZE - 1] = '\0';

 }
 }