talk.tproj/get_names.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57
  58 #include <sys/param.h>
  59 #include <sys/socket.h>
  60 #include <protocols/talkd.h>
  61 #include <pwd.h>
  62 #include "talk.h"
  63
  64 char    *getlogin();
  65 char    *ttyname();
  66 char    *rindex();
  67 extern  CTL_MSG msg;
  68
  69 /*
  70  * Determine the local and remote user, tty, and machines
  71  */
  72 get_names(argc, argv)
  73         int argc;
  74         char *argv[];
  75 {
  76         char hostname[MAXHOSTNAMELEN];
  77         char *his_name, *my_name;
  78         char *my_machine_name, *his_machine_name;
  79         char *my_tty, *his_tty;
  80         register char *cp;
  81
  82         if (argc < 2 ) {
  83                 printf("Usage: talk user [ttyname]\n");
  84                 exit(-1);
  85         }
  86         if (!isatty(0)) {
  87                 printf("Standard input must be a tty, not a pipe or a file\n");
  88                 exit(-1);
  89         }
  90         if ((my_name = getlogin()) == NULL) {
  91                 struct passwd *pw;
  92
  93                 if ((pw = getpwuid(getuid())) == NULL) {
  94                         printf("You don't exist. Go away.\n");
  95                         exit(-1);
  96                 }
  97                 my_name = pw->pw_name;
  98         }
  99         gethostname(hostname, sizeof (hostname));
 100         my_machine_name = hostname;
 101         /* check for, and strip out, the machine name of the target */
 102         for (cp = argv[1]; *cp && !index("@:!.", *cp); cp++)
 103                 ;
 104         if (*cp == '\0') {
 105                 /* this is a local to local talk */
 106                 his_name = argv[1];
 107                 his_machine_name = my_machine_name;
 108         } else {
 109                 if (*cp++ == '@') {
 110                         /* user@host */
 111                         his_name = argv[1];
 112                         his_machine_name = cp;
 113                 } else {
 114                         /* host.user or host!user or host:user */
 115                         his_name = cp;
 116                         his_machine_name = argv[1];
 117                 }
 118                 *--cp = '\0';
 119         }
 120         if (argc > 2)
 121                 his_tty = argv[2];      /* tty name is arg 2 */
 122         else
 123                 his_tty = "";
 124         get_addrs(my_machine_name, his_machine_name);
 125         /*
 126          * Initialize the message template.
 127          */
 128         msg.vers = TALK_VERSION;
 129         msg.addr.sa_family = htons(AF_INET);
 130         msg.ctl_addr.sa_family = htons(AF_INET);
 131         msg.id_num = htonl(0);
 132         strncpy(msg.l_name, my_name, NAME_SIZE);
 133         msg.l_name[NAME_SIZE - 1] = '\0';
 134         strncpy(msg.r_name, his_name, NAME_SIZE);
 135         msg.r_name[NAME_SIZE - 1] = '\0';
 136         strncpy(msg.r_tty, his_tty, TTY_SIZE);
 137         msg.r_tty[TTY_SIZE - 1] = '\0';
 138 }