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get_names.c

/*
 * Copyright (c) 1983 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.
 */

/*
 * From: @(#)get_names.c      5.9 (Berkeley) 3/1/91
 */
char gn_rcsid[] = 
  "$Id: get_names.c,v 1.11 1999/11/25 05:05:05 netbug Exp $";

#include <stdio.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <pwd.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "talk.h"

/*
 * Determine the local and remote user, tty, and machines
 */
void
get_names(int argc, char *argv[])
{
      char hostname[MAXHOSTNAMELEN];
      char *his_name, *my_name;
      char *my_machine_name, *his_machine_name;
      const char *his_tty;
      register char *cp;
      char *names;

      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 || my_name[0] == 0) {
            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 */
      names = strdup(argv[1]);
      for (cp = names; *cp && !index("@:!.", *cp); cp++)
            ;
      if (*cp == '\0') {
            /* this is a local to local talk */
            his_name = names;
            his_machine_name = my_machine_name;
      } else {
            if (*cp++ == '@') {
                  /* user@host */
                  his_name = names;
                  his_machine_name = cp;
            } else {
                  /* host.user or host!user or host:user */
                  his_name = cp;
                  his_machine_name = names;
            }
            *--cp = '\0';
      }
      if (argc > 2)
            his_tty = argv[2];      /* tty name is arg 2 */
      else
            his_tty = "";
      get_addrs(his_machine_name);
      /*
       * Initialize the message template.
       */
      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;
}

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