1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * 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 #ifndef lint 35 /*static char sccsid[] = "from: @(#)get_names.c 5.9 (Berkeley) 3/1/91";*/ 36 static char rcsid[] = "$Id: get_names.c,v 1.3 1994/04/17 12:31:05 deraadt Exp $"; 37 #endif /* not lint */ 38 39 #include <sys/param.h> 40 #include <sys/socket.h> 41 #include <protocols/talkd.h> 42 #include <pwd.h> 43 #include <string.h> 44 #include "talk.h" 45 46 char *getlogin(); 47 char *ttyname(); 48 char *rindex(); 49 extern CTL_MSG msg; 50 51 /* 52 * Determine the local and remote user, tty, and machines 53 */ 54 get_names(argc, argv) 55 int argc; 56 char *argv[]; 57 { 58 char hostname[MAXHOSTNAMELEN]; 59 char *his_name, *my_name; 60 char *my_machine_name, *his_machine_name; 61 char *my_tty, *his_tty; 62 register char *cp; 63 char *names; 64 65 if (argc < 2 ) { 66 printf("Usage: talk user [ttyname]\n"); 67 exit(-1); 68 } 69 if (!isatty(0)) { 70 printf("Standard input must be a tty, not a pipe or a file\n"); 71 exit(-1); 72 } 73 if ((my_name = getlogin()) == NULL) { 74 struct passwd *pw; 75 76 if ((pw = getpwuid(getuid())) == NULL) { 77 printf("You don't exist. Go away.\n"); 78 exit(-1); 79 } 80 my_name = pw->pw_name; 81 } 82 gethostname(hostname, sizeof (hostname)); 83 my_machine_name = hostname; 84 /* check for, and strip out, the machine name of the target */ 85 names = strdup(argv[1]); 86 for (cp = names; *cp && !index("@:!.", *cp); cp++) 87 ; 88 if (*cp == '\0') { 89 /* this is a local to local talk */ 90 his_name = names; 91 his_machine_name = my_machine_name; 92 } else { 93 if (*cp++ == '@') { 94 /* user@host */ 95 his_name = names; 96 his_machine_name = cp; 97 } else { 98 /* host.user or host!user or host:user */ 99 his_name = cp; 100 his_machine_name = names; 101 } 102 *--cp = '\0'; 103 } 104 if (argc > 2) 105 his_tty = argv[2]; /* tty name is arg 2 */ 106 else 107 his_tty = ""; 108 get_addrs(my_machine_name, his_machine_name); 109 /* 110 * Initialize the message template. 111 */ 112 msg.vers = TALK_VERSION; 113 msg.addr.sa_family = htons(AF_INET); 114 msg.ctl_addr.sa_family = htons(AF_INET); 115 msg.id_num = htonl(0); 116 strncpy(msg.l_name, my_name, NAME_SIZE); 117 msg.l_name[NAME_SIZE - 1] = '\0'; 118 strncpy(msg.r_name, his_name, NAME_SIZE); 119 msg.r_name[NAME_SIZE - 1] = '\0'; 120 strncpy(msg.r_tty, his_tty, TTY_SIZE); 121 msg.r_tty[TTY_SIZE - 1] = '\0'; 122 } 123