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 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 37 #endif 38 static const char rcsid[] = 39 "$Id$"; 40 #endif /* not lint */ 41 42 #include <err.h> 43 #include <pwd.h> 44 #include <string.h> 45 #include <sys/param.h> 46 #include "talk.h" 47 48 extern CTL_MSG msg; 49 50 static void 51 usage(void) 52 { 53 fprintf(stderr, "usage: talk person [ttyname]\n"); 54 exit(1); 55 } 56 57 /* 58 * Determine the local and remote user, tty, and machines 59 */ 60 void 61 get_names(argc, argv) 62 int argc; 63 char *argv[]; 64 { 65 char hostname[MAXHOSTNAMELEN]; 66 char *his_name, *my_name; 67 char *my_machine_name, *his_machine_name; 68 char *my_tty, *his_tty; 69 register char *cp; 70 71 if (argc < 2 ) 72 usage(); 73 if (!isatty(0)) 74 errx(1, "standard input must be a tty, not a pipe or a file"); 75 if ((my_name = getlogin()) == NULL) { 76 struct passwd *pw; 77 78 if ((pw = getpwuid(getuid())) == NULL) 79 errx(1, "you don't exist. Go away"); 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 for (cp = argv[1]; *cp && !index("@:!", *cp); cp++) 86 ; 87 if (*cp == '\0') { 88 /* this is a local to local talk */ 89 his_name = argv[1]; 90 his_machine_name = my_machine_name; 91 } else { 92 if (*cp++ == '@') { 93 /* user@host */ 94 his_name = argv[1]; 95 his_machine_name = cp; 96 } else { 97 /* host!user or host:user */ 98 his_name = cp; 99 his_machine_name = argv[1]; 100 } 101 *--cp = '\0'; 102 } 103 if (argc > 2) 104 his_tty = argv[2]; /* tty name is arg 2 */ 105 else 106 his_tty = ""; 107 get_addrs(my_machine_name, his_machine_name); 108 /* 109 * Initialize the message template. 110 */ 111 msg.vers = TALK_VERSION; 112 msg.addr.sa_family = htons(AF_INET); 113 msg.ctl_addr.sa_family = htons(AF_INET); 114 msg.id_num = htonl(0); 115 strncpy(msg.l_name, my_name, NAME_SIZE); 116 msg.l_name[NAME_SIZE - 1] = '\0'; 117 strncpy(msg.r_name, his_name, NAME_SIZE); 118 msg.r_name[NAME_SIZE - 1] = '\0'; 119 strncpy(msg.r_tty, his_tty, TTY_SIZE); 120 msg.r_tty[TTY_SIZE - 1] = '\0'; 121 } 122