1/* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include <sys/cdefs.h> 35 36#ifndef __APPLE__ 37__FBSDID("$FreeBSD: src/usr.bin/talk/get_names.c,v 1.9 2004/06/14 22:34:13 bms Exp $"); 38 39#ifndef lint 40static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 41#endif 42#endif /* __APPLE__ */ 43 44#include <sys/param.h> 45 46#include <err.h> 47#include <pwd.h> 48#include <stdlib.h> 49#include <string.h> 50 51#include "talk.h" 52 53extern CTL_MSG msg; 54 55static void 56usage(void) 57{ 58 fprintf(stderr, "usage: talk person [ttyname]\n"); 59 exit(1); 60} 61 62/* 63 * Determine the local and remote user, tty, and machines 64 */ 65void 66get_names(argc, argv) 67 int argc; 68 char *argv[]; 69{ 70 char hostname[MAXHOSTNAMELEN]; 71 char *his_name, *my_name; 72 char *my_machine_name, *his_machine_name; 73 const char *his_tty; 74 char *cp; 75 76 if (argc < 2 ) 77 usage(); 78 if (!isatty(0)) 79 errx(1, "standard input must be a tty, not a pipe or a file"); 80 if ((my_name = getlogin()) == NULL) { 81 struct passwd *pw; 82 83 if ((pw = getpwuid(getuid())) == NULL) 84 errx(1, "you don't exist. Go away"); 85 my_name = pw->pw_name; 86 } 87 gethostname(hostname, sizeof (hostname)); 88 my_machine_name = hostname; 89 /* check for, and strip out, the machine name of the target */ 90 for (cp = argv[1]; *cp && !index("@:!", *cp); cp++) 91 ; 92 if (*cp == '\0') { 93 /* this is a local to local talk */ 94 his_name = argv[1]; 95 my_machine_name = his_machine_name = "localhost"; 96 } else { 97 if (*cp++ == '@') { 98 /* user@host */ 99 his_name = argv[1]; 100 his_machine_name = cp; 101 } else { 102 /* host!user or host:user */ 103 his_name = cp; 104 his_machine_name = argv[1]; 105 } 106 *--cp = '\0'; 107 } 108 if (argc > 2) 109 his_tty = argv[2]; /* tty name is arg 2 */ 110 else 111 his_tty = ""; 112 get_addrs(my_machine_name, his_machine_name); 113 /* 114 * Initialize the message template. 115 */ 116 msg.vers = TALK_VERSION; 117 msg.addr.sa_family = htons(AF_INET); 118 msg.ctl_addr.sa_family = htons(AF_INET); 119 msg.id_num = htonl(0); 120 strncpy(msg.l_name, my_name, NAME_SIZE); 121 msg.l_name[NAME_SIZE - 1] = '\0'; 122 strncpy(msg.r_name, his_name, NAME_SIZE); 123 msg.r_name[NAME_SIZE - 1] = '\0'; 124 strncpy(msg.r_tty, his_tty, TTY_SIZE); 125 msg.r_tty[TTY_SIZE - 1] = '\0'; 126} 127