1 /* $OpenBSD: get_names.c,v 1.19 2010/08/12 23:31:29 tedu 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 #include "talk.h" 34 #include <sys/param.h> 35 #include <pwd.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 39 extern CTL_MSG msg; 40 41 /* 42 * Determine the local and remote user, tty, and machines 43 */ 44 void 45 get_names(int argc, char *argv[]) 46 { 47 char hostname[MAXHOSTNAMELEN]; 48 char *his_name, *my_name; 49 char *my_machine_name, *his_machine_name; 50 char *his_tty; 51 char *cp; 52 char *names; 53 54 if (argc > 1 && !strcmp(argv[1], "-H")) { 55 argv[1] = argv[0]; 56 ++argv; 57 --argc; 58 high_print = 1; 59 } 60 61 if (argc > 1 && !strcmp(argv[1], "-s")) { 62 argv[1] = argv[0]; 63 ++argv; 64 --argc; 65 smooth_scroll = TRUE; 66 } 67 68 if ((argc < 2 ) || ('@' == argv[1][0])) { 69 fprintf(stderr, "usage: talk [-Hs] person [ttyname]\n"); 70 exit(1); 71 } 72 if (!isatty(STDIN_FILENO)) 73 errx(1, "standard input must be a tty, not a pipe or a file"); 74 75 if ((my_name = getlogin()) == NULL) { 76 struct passwd *pw; 77 78 if ((pw = getpwuid(getuid())) == NULL) 79 errx(1, "you don't exist in the passwd file."); 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 if (names == NULL) 87 errx(1, "out of memory"); 88 for (cp = names; *cp && !strchr("@:!.", *cp); cp++) 89 ; 90 if (*cp == '\0') { 91 /* this is a local to local talk */ 92 his_name = names; 93 his_machine_name = my_machine_name; 94 } else { 95 if (*cp++ == '@') { 96 /* user@host */ 97 his_name = names; 98 his_machine_name = cp; 99 } else { 100 /* host.user or host!user or host:user */ 101 his_name = cp; 102 his_machine_name = names; 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 free(names); 125 } 126