19b50d902SRodney W. Grimes /* 29b50d902SRodney W. Grimes * Copyright (c) 1983, 1993 39b50d902SRodney W. Grimes * The Regents of the University of California. All rights reserved. 49b50d902SRodney W. Grimes * 59b50d902SRodney W. Grimes * Redistribution and use in source and binary forms, with or without 69b50d902SRodney W. Grimes * modification, are permitted provided that the following conditions 79b50d902SRodney W. Grimes * are met: 89b50d902SRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 99b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer. 109b50d902SRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 119b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 129b50d902SRodney W. Grimes * documentation and/or other materials provided with the distribution. 13*fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors 149b50d902SRodney W. Grimes * may be used to endorse or promote products derived from this software 159b50d902SRodney W. Grimes * without specific prior written permission. 169b50d902SRodney W. Grimes * 179b50d902SRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 189b50d902SRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 199b50d902SRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 209b50d902SRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 219b50d902SRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 229b50d902SRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 239b50d902SRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 249b50d902SRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 259b50d902SRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 269b50d902SRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 279b50d902SRodney W. Grimes * SUCH DAMAGE. 289b50d902SRodney W. Grimes */ 299b50d902SRodney W. Grimes 30caa64801SMark Murray #include <sys/cdefs.h> 31caa64801SMark Murray 32caa64801SMark Murray __FBSDID("$FreeBSD$"); 33caa64801SMark Murray 349b50d902SRodney W. Grimes #ifndef lint 35caa64801SMark Murray static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 3620868061SPhilippe Charnier #endif 37caa64801SMark Murray 38caa64801SMark Murray #include <sys/param.h> 399b50d902SRodney W. Grimes 4020868061SPhilippe Charnier #include <err.h> 4120868061SPhilippe Charnier #include <pwd.h> 429582ea7eSDima Dorfman #include <stdlib.h> 4328592604SJoerg Wunsch #include <string.h> 443daadfc8SXin LI #include <unistd.h> 45caa64801SMark Murray 469b50d902SRodney W. Grimes #include "talk.h" 479b50d902SRodney W. Grimes 489b50d902SRodney W. Grimes extern CTL_MSG msg; 499b50d902SRodney W. Grimes 5020868061SPhilippe Charnier static void 5120868061SPhilippe Charnier usage(void) 5220868061SPhilippe Charnier { 5320868061SPhilippe Charnier fprintf(stderr, "usage: talk person [ttyname]\n"); 5420868061SPhilippe Charnier exit(1); 5520868061SPhilippe Charnier } 5620868061SPhilippe Charnier 579b50d902SRodney W. Grimes /* 589b50d902SRodney W. Grimes * Determine the local and remote user, tty, and machines 599b50d902SRodney W. Grimes */ 6028592604SJoerg Wunsch void 61b6d9e1f3SXin LI get_names(int argc, char *argv[]) 629b50d902SRodney W. Grimes { 639b50d902SRodney W. Grimes char hostname[MAXHOSTNAMELEN]; 649b50d902SRodney W. Grimes char *his_name, *my_name; 65b6d9e1f3SXin LI const char *my_machine_name, *his_machine_name; 66caa64801SMark Murray const char *his_tty; 67caa64801SMark Murray char *cp; 689b50d902SRodney W. Grimes 6920868061SPhilippe Charnier if (argc < 2 ) 7020868061SPhilippe Charnier usage(); 7120868061SPhilippe Charnier if (!isatty(0)) 7220868061SPhilippe Charnier errx(1, "standard input must be a tty, not a pipe or a file"); 739b50d902SRodney W. Grimes if ((my_name = getlogin()) == NULL) { 749b50d902SRodney W. Grimes struct passwd *pw; 759b50d902SRodney W. Grimes 7620868061SPhilippe Charnier if ((pw = getpwuid(getuid())) == NULL) 7720868061SPhilippe Charnier errx(1, "you don't exist. Go away"); 789b50d902SRodney W. Grimes my_name = pw->pw_name; 799b50d902SRodney W. Grimes } 809b50d902SRodney W. Grimes gethostname(hostname, sizeof (hostname)); 819b50d902SRodney W. Grimes my_machine_name = hostname; 829b50d902SRodney W. Grimes /* check for, and strip out, the machine name of the target */ 8375ac3edfSEd Schouten cp = argv[1] + strcspn(argv[1], "@:!"); 849b50d902SRodney W. Grimes if (*cp == '\0') { 859b50d902SRodney W. Grimes /* this is a local to local talk */ 869b50d902SRodney W. Grimes his_name = argv[1]; 879d61853dSBruce M Simpson my_machine_name = his_machine_name = "localhost"; 889b50d902SRodney W. Grimes } else { 89c6189102SAndrey A. Chernov if (*cp++ == '@') { 909b50d902SRodney W. Grimes /* user@host */ 919b50d902SRodney W. Grimes his_name = argv[1]; 92c6189102SAndrey A. Chernov his_machine_name = cp; 93c6189102SAndrey A. Chernov } else { 94c6189102SAndrey A. Chernov /* host!user or host:user */ 95c6189102SAndrey A. Chernov his_name = cp; 96c6189102SAndrey A. Chernov his_machine_name = argv[1]; 97c6189102SAndrey A. Chernov } 98c6189102SAndrey A. Chernov *--cp = '\0'; 999b50d902SRodney W. Grimes } 1009b50d902SRodney W. Grimes if (argc > 2) 1019b50d902SRodney W. Grimes his_tty = argv[2]; /* tty name is arg 2 */ 1029b50d902SRodney W. Grimes else 1039b50d902SRodney W. Grimes his_tty = ""; 1049b50d902SRodney W. Grimes get_addrs(my_machine_name, his_machine_name); 1059b50d902SRodney W. Grimes /* 1069b50d902SRodney W. Grimes * Initialize the message template. 1079b50d902SRodney W. Grimes */ 1089b50d902SRodney W. Grimes msg.vers = TALK_VERSION; 1099b50d902SRodney W. Grimes msg.addr.sa_family = htons(AF_INET); 1109b50d902SRodney W. Grimes msg.ctl_addr.sa_family = htons(AF_INET); 1119b50d902SRodney W. Grimes msg.id_num = htonl(0); 1121c8ee5f2SXin LI strlcpy(msg.l_name, my_name, NAME_SIZE); 1131c8ee5f2SXin LI strlcpy(msg.r_name, his_name, NAME_SIZE); 1141c8ee5f2SXin LI strlcpy(msg.r_tty, his_tty, TTY_SIZE); 1159b50d902SRodney W. Grimes } 116