| 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 | * @(#)get_names.c 8.1 (Berkeley) 6/6/93 |
| 34 | * $FreeBSD: src/usr.bin/talk/get_names.c,v 1.6.2.1 2001/07/30 10:31:29 dd Exp $ |
| 35 | * $DragonFly: src/usr.bin/talk/get_names.c,v 1.5 2008/10/16 01:52:33 swildner Exp $ |
| 36 | */ |
| 37 | |
| 38 | #include <err.h> |
| 39 | #include <pwd.h> |
| 40 | #include <stdlib.h> |
| 41 | #include <string.h> |
| 42 | #include <sys/param.h> |
| 43 | #include "talk.h" |
| 44 | |
| 45 | extern CTL_MSG msg; |
| 46 | |
| 47 | static void |
| 48 | usage(void) |
| 49 | { |
| 50 | fprintf(stderr, "usage: talk person [ttyname]\n"); |
| 51 | exit(1); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * Determine the local and remote user, tty, and machines |
| 56 | */ |
| 57 | void |
| 58 | get_names(int argc, char **argv) |
| 59 | { |
| 60 | char hostname[MAXHOSTNAMELEN]; |
| 61 | char *his_name, *my_name; |
| 62 | char *my_machine_name, *his_machine_name; |
| 63 | char *my_tty, *his_tty; |
| 64 | char *cp; |
| 65 | |
| 66 | if (argc < 2 ) |
| 67 | usage(); |
| 68 | if (!isatty(0)) |
| 69 | errx(1, "standard input must be a tty, not a pipe or a file"); |
| 70 | if ((my_name = getlogin()) == NULL) { |
| 71 | struct passwd *pw; |
| 72 | |
| 73 | if ((pw = getpwuid(getuid())) == NULL) |
| 74 | errx(1, "you don't exist. Go away"); |
| 75 | my_name = pw->pw_name; |
| 76 | } |
| 77 | gethostname(hostname, sizeof (hostname)); |
| 78 | my_machine_name = hostname; |
| 79 | /* check for, and strip out, the machine name of the target */ |
| 80 | for (cp = argv[1]; *cp && !strchr("@:!", *cp); cp++) |
| 81 | ; |
| 82 | if (*cp == '\0') { |
| 83 | /* this is a local to local talk */ |
| 84 | his_name = argv[1]; |
| 85 | his_machine_name = my_machine_name; |
| 86 | } else { |
| 87 | if (*cp++ == '@') { |
| 88 | /* user@host */ |
| 89 | his_name = argv[1]; |
| 90 | his_machine_name = cp; |
| 91 | } else { |
| 92 | /* host!user or host:user */ |
| 93 | his_name = cp; |
| 94 | his_machine_name = argv[1]; |
| 95 | } |
| 96 | *--cp = '\0'; |
| 97 | } |
| 98 | if (argc > 2) |
| 99 | his_tty = argv[2]; /* tty name is arg 2 */ |
| 100 | else |
| 101 | his_tty = ""; |
| 102 | get_addrs(my_machine_name, his_machine_name); |
| 103 | /* |
| 104 | * Initialize the message template. |
| 105 | */ |
| 106 | msg.vers = TALK_VERSION; |
| 107 | msg.addr.sa_family = htons(AF_INET); |
| 108 | msg.ctl_addr.sa_family = htons(AF_INET); |
| 109 | msg.id_num = htonl(0); |
| 110 | strncpy(msg.l_name, my_name, NAME_SIZE); |
| 111 | msg.l_name[NAME_SIZE - 1] = '\0'; |
| 112 | strncpy(msg.r_name, his_name, NAME_SIZE); |
| 113 | msg.r_name[NAME_SIZE - 1] = '\0'; |
| 114 | strncpy(msg.r_tty, his_tty, TTY_SIZE); |
| 115 | msg.r_tty[TTY_SIZE - 1] = '\0'; |
| 116 | } |