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/* $OpenBSD: get_names.c,v 1.21 2016/02/01 07:29:25 mestre Exp $ */ |
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/* $NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $ */ |
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/* |
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* Copyright (c) 1983, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/socket.h> |
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#include <err.h> |
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#include <limits.h> |
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#include <pwd.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "talk.h" |
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extern CTL_MSG msg; |
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/* |
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* Determine the local and remote user, tty, and machines |
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*/ |
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void |
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get_names(int argc, char *argv[]) |
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{ |
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char hostname[HOST_NAME_MAX+1]; |
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char *his_name, *my_name; |
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char *my_machine_name, *his_machine_name; |
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char *his_tty; |
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char *cp; |
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char *names; |
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if (argc > 1 && !strcmp(argv[1], "-H")) { |
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argv[1] = argv[0]; |
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++argv; |
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--argc; |
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high_print = 1; |
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} |
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if (argc > 1 && !strcmp(argv[1], "-s")) { |
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argv[1] = argv[0]; |
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++argv; |
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--argc; |
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smooth_scroll = TRUE; |
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} |
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if ((argc < 2 ) || ('@' == argv[1][0])) { |
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extern char *__progname; |
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fprintf(stderr, "usage: %s [-Hs] person [ttyname]\n", __progname); |
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exit(1); |
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} |
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if (!isatty(STDIN_FILENO)) |
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errx(1, "standard input must be a tty, not a pipe or a file"); |
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if ((my_name = getlogin()) == NULL) { |
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struct passwd *pw; |
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if ((pw = getpwuid(getuid())) == NULL) |
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errx(1, "you don't exist in the passwd file."); |
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my_name = pw->pw_name; |
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} |
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gethostname(hostname, sizeof (hostname)); |
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my_machine_name = hostname; |
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/* check for, and strip out, the machine name of the target */ |
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names = strdup(argv[1]); |
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if (names == NULL) |
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errx(1, "out of memory"); |
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for (cp = names; *cp && !strchr("@:!.", *cp); cp++) |
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; |
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if (*cp == '\0') { |
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/* this is a local to local talk */ |
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his_name = names; |
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his_machine_name = my_machine_name; |
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} else { |
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if (*cp++ == '@') { |
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/* user@host */ |
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his_name = names; |
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his_machine_name = cp; |
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} else { |
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/* host.user or host!user or host:user */ |
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his_name = cp; |
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his_machine_name = names; |
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} |
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*--cp = '\0'; |
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} |
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if (argc > 2) |
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his_tty = argv[2]; /* tty name is arg 2 */ |
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else |
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his_tty = ""; |
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get_addrs(my_machine_name, his_machine_name); |
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/* |
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* Initialize the message template. |
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*/ |
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msg.vers = TALK_VERSION; |
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msg.addr.sa_family = htons(AF_INET); |
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msg.ctl_addr.sa_family = htons(AF_INET); |
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msg.id_num = htonl(0); |
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strncpy(msg.l_name, my_name, NAME_SIZE); |
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msg.l_name[NAME_SIZE - 1] = '\0'; |
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strncpy(msg.r_name, his_name, NAME_SIZE); |
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msg.r_name[NAME_SIZE - 1] = '\0'; |
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strncpy(msg.r_tty, his_tty, TTY_SIZE); |
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msg.r_tty[TTY_SIZE - 1] = '\0'; |
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free(names); |
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} |