talk.tproj/get_names.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <sys/param.h>
  60 #include <sys/socket.h>
  61 #include <protocols/talkd.h>
  62 #include <pwd.h>
  63 #include "talk.h"
  64
  65 char    *getlogin();
  66 char    *ttyname();
  67 char    *rindex();
  68 extern  CTL_MSG msg;
  69
  70 /*
  71  * Determine the local and remote user, tty, and machines
  72  */
  73 get_names(argc, argv)
  74         int argc;
  75         char *argv[];
  76 {
  77         char hostname[MAXHOSTNAMELEN];
  78         char *his_name, *my_name;
  79         char *my_machine_name, *his_machine_name;
  80         char *my_tty, *his_tty;
  81         register char *cp;
  82
  83         if (argc < 2 ) {
  84                 printf("Usage: talk user [ttyname]\n");
  85                 exit(-1);
  86         }
  87         if (!isatty(0)) {
  88                 printf("Standard input must be a tty, not a pipe or a file\n");
  89                 exit(-1);
  90         }
  91         if ((my_name = getlogin()) == NULL) {
  92                 struct passwd *pw;
  93
  94                 if ((pw = getpwuid(getuid())) == NULL) {
  95                         printf("You don't exist. Go away.\n");
  96                         exit(-1);
  97                 }
  98                 my_name = pw->pw_name;
  99         }
 100         gethostname(hostname, sizeof (hostname));
 101         my_machine_name = hostname;
 102         /* check for, and strip out, the machine name of the target */
 103         for (cp = argv[1]; *cp && !index("@:!.", *cp); cp++)
 104                 ;
 105         if (*cp == '\0') {
 106                 /* this is a local to local talk */
 107                 his_name = argv[1];
 108                 his_machine_name = my_machine_name;
 109         } else {
 110                 if (*cp++ == '@') {
 111                         /* user@host */
 112                         his_name = argv[1];
 113                         his_machine_name = cp;
 114                 } else {
 115                         /* host.user or host!user or host:user */
 116                         his_name = cp;
 117                         his_machine_name = argv[1];
 118                 }
 119                 *--cp = '\0';
 120         }
 121         if (argc > 2)
 122                 his_tty = argv[2];      /* tty name is arg 2 */
 123         else
 124                 his_tty = "";
 125         get_addrs(my_machine_name, his_machine_name);
 126         /*
 127          * Initialize the message template.
 128          */
 129         msg.vers = TALK_VERSION;
 130         msg.addr.sa_family = htons(AF_INET);
 131         msg.ctl_addr.sa_family = htons(AF_INET);
 132         msg.id_num = htonl(0);
 133         strncpy(msg.l_name, my_name, NAME_SIZE);
 134         msg.l_name[NAME_SIZE - 1] = '\0';
 135         strncpy(msg.r_name, his_name, NAME_SIZE);
 136         msg.r_name[NAME_SIZE - 1] = '\0';
 137         strncpy(msg.r_tty, his_tty, TTY_SIZE);
 138         msg.r_tty[TTY_SIZE - 1] = '\0';
 139 }