get_names.c revision 1.4
1/* $OpenBSD: get_names.c,v 1.4 1997/02/01 19:38:26 jkatz Exp $ */ 2/* $NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $ */ 3 4/* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38#if 0 39static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 40#endif 41static char rcsid[] = "$OpenBSD: get_names.c,v 1.4 1997/02/01 19:38:26 jkatz Exp $"; 42#endif /* not lint */ 43 44#include <sys/param.h> 45#include <sys/socket.h> 46#include <protocols/talkd.h> 47#include <pwd.h> 48#include <string.h> 49#include "talk.h" 50 51char *getlogin(); 52char *ttyname(); 53extern CTL_MSG msg; 54 55/* 56 * Determine the local and remote user, tty, and machines 57 */ 58get_names(argc, argv) 59 int argc; 60 char *argv[]; 61{ 62 char hostname[MAXHOSTNAMELEN]; 63 char *his_name, *my_name; 64 char *my_machine_name, *his_machine_name; 65 char *my_tty, *his_tty; 66 register char *cp; 67 char *names; 68 69 if (argc < 2 ) { 70 printf("Usage: talk user [ttyname]\n"); 71 printf(" talk user@hostname [ttyname]\n"); 72 exit(-1); 73 } 74 if (!isatty(0)) { 75 printf("Standard input must be a tty, not a pipe or a file\n"); 76 exit(-1); 77 } 78 79 if ('@' == argv[1][0]) { 80 printf("Usage: talk user [ttyname]\n"); 81 printf(" talk user@hostname [ttyname]\n"); 82 exit(-1); 83 } 84 85 if ((my_name = getlogin()) == NULL) { 86 struct passwd *pw; 87 88 if ((pw = getpwuid(getuid())) == NULL) { 89 printf("You don't exist. Go away.\n"); 90 exit(-1); 91 } 92 my_name = pw->pw_name; 93 } 94 gethostname(hostname, sizeof (hostname)); 95 my_machine_name = hostname; 96 /* check for, and strip out, the machine name of the target */ 97 names = strdup(argv[1]); 98 for (cp = names; *cp && !strchr("@:!.", *cp); cp++) 99 ; 100 if (*cp == '\0') { 101 /* this is a local to local talk */ 102 his_name = names; 103 his_machine_name = my_machine_name; 104 } else { 105 if (*cp++ == '@') { 106 /* user@host */ 107 his_name = names; 108 his_machine_name = cp; 109 } else { 110 /* host.user or host!user or host:user */ 111 his_name = cp; 112 his_machine_name = names; 113 } 114 *--cp = '\0'; 115 } 116 if (argc > 2) 117 his_tty = argv[2]; /* tty name is arg 2 */ 118 else 119 his_tty = ""; 120 get_addrs(my_machine_name, his_machine_name); 121 /* 122 * Initialize the message template. 123 */ 124 msg.vers = TALK_VERSION; 125 msg.addr.sa_family = htons(AF_INET); 126 msg.ctl_addr.sa_family = htons(AF_INET); 127 msg.id_num = htonl(0); 128 strncpy(msg.l_name, my_name, NAME_SIZE); 129 msg.l_name[NAME_SIZE - 1] = '\0'; 130 strncpy(msg.r_name, his_name, NAME_SIZE); 131 msg.r_name[NAME_SIZE - 1] = '\0'; 132 strncpy(msg.r_tty, his_tty, TTY_SIZE); 133 msg.r_tty[TTY_SIZE - 1] = '\0'; 134} 135