get_names.c revision 32503
1324145Smm/* 2324145Smm * Copyright (c) 1983, 1993 3324145Smm * The Regents of the University of California. All rights reserved. 4324145Smm * 5324145Smm * Redistribution and use in source and binary forms, with or without 6324145Smm * modification, are permitted provided that the following conditions 7324145Smm * are met: 8324145Smm * 1. Redistributions of source code must retain the above copyright 9324145Smm * notice, this list of conditions and the following disclaimer. 10324145Smm * 2. Redistributions in binary form must reproduce the above copyright 11324145Smm * notice, this list of conditions and the following disclaimer in the 12324145Smm * documentation and/or other materials provided with the distribution. 13324145Smm * 3. All advertising materials mentioning features or use of this software 14324145Smm * must display the following acknowledgement: 15324145Smm * This product includes software developed by the University of 16324145Smm * California, Berkeley and its contributors. 17324145Smm * 4. Neither the name of the University nor the names of its contributors 18324145Smm * may be used to endorse or promote products derived from this software 19324145Smm * without specific prior written permission. 20324145Smm * 21324145Smm * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22324145Smm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23324145Smm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24324145Smm * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25324145Smm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26324145Smm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27324145Smm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28324145Smm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29324145Smm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30324145Smm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31324145Smm * SUCH DAMAGE. 32324145Smm */ 33324145Smm 34324145Smm#ifndef lint 35324145Smm#if 0 36324145Smmstatic char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 37324145Smm#endif 38324145Smmstatic const char rcsid[] = 39324145Smm "$Id$"; 40324145Smm#endif /* not lint */ 41324145Smm 42324145Smm#include <err.h> 43324145Smm#include <pwd.h> 44324145Smm#include <string.h> 45324145Smm#include <sys/param.h> 46324145Smm#include "talk.h" 47324145Smm 48324145Smmextern CTL_MSG msg; 49324145Smm 50324145Smmstatic void 51324145Smmusage(void) 52324145Smm{ 53324145Smm fprintf(stderr, "usage: talk person [ttyname]\n"); 54324145Smm exit(1); 55324145Smm} 56324145Smm 57324145Smm/* 58324145Smm * Determine the local and remote user, tty, and machines 59324145Smm */ 60324145Smmvoid 61324145Smmget_names(argc, argv) 62324145Smm int argc; 63324145Smm char *argv[]; 64324145Smm{ 65324145Smm char hostname[MAXHOSTNAMELEN]; 66324145Smm char *his_name, *my_name; 67324145Smm char *my_machine_name, *his_machine_name; 68324145Smm char *my_tty, *his_tty; 69324145Smm register char *cp; 70324145Smm 71324145Smm if (argc < 2 ) 72324145Smm usage(); 73324145Smm if (!isatty(0)) 74324145Smm errx(1, "standard input must be a tty, not a pipe or a file"); 75324145Smm if ((my_name = getlogin()) == NULL) { 76324145Smm struct passwd *pw; 77324145Smm 78324145Smm if ((pw = getpwuid(getuid())) == NULL) 79324145Smm errx(1, "you don't exist. Go away"); 80324145Smm my_name = pw->pw_name; 81324145Smm } 82324145Smm gethostname(hostname, sizeof (hostname)); 83324145Smm my_machine_name = hostname; 84324145Smm /* check for, and strip out, the machine name of the target */ 85324145Smm for (cp = argv[1]; *cp && !index("@:!", *cp); cp++) 86324145Smm ; 87324145Smm if (*cp == '\0') { 88324145Smm /* this is a local to local talk */ 89324145Smm his_name = argv[1]; 90324145Smm his_machine_name = my_machine_name; 91324145Smm } else { 92324145Smm if (*cp++ == '@') { 93324145Smm /* user@host */ 94324145Smm his_name = argv[1]; 95324145Smm his_machine_name = cp; 96324145Smm } else { 97324145Smm /* host!user or host:user */ 98324145Smm his_name = cp; 99324145Smm his_machine_name = argv[1]; 100324145Smm } 101324145Smm *--cp = '\0'; 102324145Smm } 103324145Smm if (argc > 2) 104324145Smm his_tty = argv[2]; /* tty name is arg 2 */ 105324145Smm else 106324145Smm his_tty = ""; 107324145Smm get_addrs(my_machine_name, his_machine_name); 108324145Smm /* 109324145Smm * Initialize the message template. 110324145Smm */ 111324145Smm msg.vers = TALK_VERSION; 112324145Smm msg.addr.sa_family = htons(AF_INET); 113324145Smm msg.ctl_addr.sa_family = htons(AF_INET); 114324145Smm msg.id_num = htonl(0); 115324145Smm strncpy(msg.l_name, my_name, NAME_SIZE); 116324145Smm msg.l_name[NAME_SIZE - 1] = '\0'; 117324145Smm strncpy(msg.r_name, his_name, NAME_SIZE); 118324145Smm msg.r_name[NAME_SIZE - 1] = '\0'; 119324145Smm strncpy(msg.r_tty, his_tty, TTY_SIZE); 120324145Smm msg.r_tty[TTY_SIZE - 1] = '\0'; 121324145Smm} 122362133Smm