1 /* $OpenBSD: get_names.c,v 1.13 2003/07/10 00:06:51 david 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 static char rcsid[] = "$OpenBSD: get_names.c,v 1.13 2003/07/10 00:06:51 david Exp $"; 38 #endif /* not lint */ 39 40 #include "talk.h" 41 #include <sys/param.h> 42 #include <pwd.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 extern CTL_MSG msg; 47 48 /* 49 * Determine the local and remote user, tty, and machines 50 */ 51 void 52 get_names(argc, argv) 53 int argc; 54 char *argv[]; 55 { 56 char hostname[MAXHOSTNAMELEN]; 57 char *his_name, *my_name; 58 char *my_machine_name, *his_machine_name; 59 char *his_tty; 60 char *cp; 61 char *names; 62 63 if (argc > 1 && !strcmp(argv[1], "-H")) { 64 argv[1] = argv[0]; 65 ++argv; 66 --argc; 67 high_print = 1; 68 } 69 70 if (argc > 1 && !strcmp(argv[1], "-s")) { 71 argv[1] = argv[0]; 72 ++argv; 73 --argc; 74 smooth_scroll = TRUE; 75 } 76 77 if ((argc < 2 ) || ('@' == argv[1][0])) { 78 fprintf(stderr, "usage: talk [-Hs] user [ttyname]\n" 79 " talk [-Hs] user@hostname [ttyname]\n"); 80 exit(1); 81 } 82 if (!isatty(STDIN_FILENO)) 83 errx(1, "standard input must be a tty, not a pipe or a file"); 84 85 if ((my_name = getlogin()) == NULL) { 86 struct passwd *pw; 87 88 if ((pw = getpwuid(getuid())) == NULL) 89 errx(1, "you don't exist in the passwd file."); 90 my_name = pw->pw_name; 91 } 92 gethostname(hostname, sizeof (hostname)); 93 my_machine_name = hostname; 94 /* check for, and strip out, the machine name of the target */ 95 names = strdup(argv[1]); 96 for (cp = names; *cp && !strchr("@:!.", *cp); cp++) 97 ; 98 if (*cp == '\0') { 99 /* this is a local to local talk */ 100 his_name = names; 101 his_machine_name = my_machine_name; 102 } else { 103 if (*cp++ == '@') { 104 /* user@host */ 105 his_name = names; 106 his_machine_name = cp; 107 } else { 108 /* host.user or host!user or host:user */ 109 his_name = cp; 110 his_machine_name = names; 111 } 112 *--cp = '\0'; 113 } 114 if (argc > 2) 115 his_tty = argv[2]; /* tty name is arg 2 */ 116 else 117 his_tty = ""; 118 get_addrs(my_machine_name, his_machine_name); 119 /* 120 * Initialize the message template. 121 */ 122 msg.vers = TALK_VERSION; 123 msg.addr.sa_family = htons(AF_INET); 124 msg.ctl_addr.sa_family = htons(AF_INET); 125 msg.id_num = htonl(0); 126 strncpy(msg.l_name, my_name, NAME_SIZE); 127 msg.l_name[NAME_SIZE - 1] = '\0'; 128 strncpy(msg.r_name, his_name, NAME_SIZE); 129 msg.r_name[NAME_SIZE - 1] = '\0'; 130 strncpy(msg.r_tty, his_tty, TTY_SIZE); 131 msg.r_tty[TTY_SIZE - 1] = '\0'; 132 } 133