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 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 42 #include <sys/param.h> 43 44 #include <err.h> 45 #include <pwd.h> 46 #include <stdlib.h> 47 #include <string.h> 48 49 #include "talk.h" 50 51 extern CTL_MSG msg; 52 53 static void 54 usage(void) 55 { 56 fprintf(stderr, "usage: talk person [ttyname]\n"); 57 exit(1); 58 } 59 60 /* 61 * Determine the local and remote user, tty, and machines 62 */ 63 void 64 get_names(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 char hostname[MAXHOSTNAMELEN]; 69 char *his_name, *my_name; 70 char *my_machine_name, *his_machine_name; 71 const char *his_tty; 72 char *cp; 73 74 if (argc < 2 ) 75 usage(); 76 if (!isatty(0)) 77 errx(1, "standard input must be a tty, not a pipe or a file"); 78 if ((my_name = getlogin()) == NULL) { 79 struct passwd *pw; 80 81 if ((pw = getpwuid(getuid())) == NULL) 82 errx(1, "you don't exist. Go away"); 83 my_name = pw->pw_name; 84 } 85 gethostname(hostname, sizeof (hostname)); 86 my_machine_name = hostname; 87 /* check for, and strip out, the machine name of the target */ 88 for (cp = argv[1]; *cp && !index("@:!", *cp); cp++) 89 ; 90 if (*cp == '\0') { 91 /* this is a local to local talk */ 92 his_name = argv[1]; 93 his_machine_name = my_machine_name; 94 } else { 95 if (*cp++ == '@') { 96 /* user@host */ 97 his_name = argv[1]; 98 his_machine_name = cp; 99 } else { 100 /* host!user or host:user */ 101 his_name = cp; 102 his_machine_name = argv[1]; 103 } 104 *--cp = '\0'; 105 } 106 if (argc > 2) 107 his_tty = argv[2]; /* tty name is arg 2 */ 108 else 109 his_tty = ""; 110 get_addrs(my_machine_name, his_machine_name); 111 /* 112 * Initialize the message template. 113 */ 114 msg.vers = TALK_VERSION; 115 msg.addr.sa_family = htons(AF_INET); 116 msg.ctl_addr.sa_family = htons(AF_INET); 117 msg.id_num = htonl(0); 118 strncpy(msg.l_name, my_name, NAME_SIZE); 119 msg.l_name[NAME_SIZE - 1] = '\0'; 120 strncpy(msg.r_name, his_name, NAME_SIZE); 121 msg.r_name[NAME_SIZE - 1] = '\0'; 122 strncpy(msg.r_tty, his_tty, TTY_SIZE); 123 msg.r_tty[TTY_SIZE - 1] = '\0'; 124 } 125