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Annotation of src/usr.bin/talk/get_names.c, Revision 1.1

1.1     ! deraadt     1: /*     $NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $        */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1983, 1993
        !             5:  *     The Regents of the University of California.  All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  * 3. All advertising materials mentioning features or use of this software
        !            16:  *    must display the following acknowledgement:
        !            17:  *     This product includes software developed by the University of
        !            18:  *     California, Berkeley and its contributors.
        !            19:  * 4. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  */
        !            35:
        !            36: #ifndef lint
        !            37: #if 0
        !            38: static char sccsid[] = "@(#)get_names.c        8.1 (Berkeley) 6/6/93";
        !            39: #endif
        !            40: static char rcsid[] = "$NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $";
        !            41: #endif /* not lint */
        !            42:
        !            43: #include <sys/param.h>
        !            44: #include <sys/socket.h>
        !            45: #include <protocols/talkd.h>
        !            46: #include <pwd.h>
        !            47: #include <string.h>
        !            48: #include "talk.h"
        !            49:
        !            50: char   *getlogin();
        !            51: char   *ttyname();
        !            52: char   *rindex();
        !            53: extern CTL_MSG msg;
        !            54:
        !            55: /*
        !            56:  * Determine the local and remote user, tty, and machines
        !            57:  */
        !            58: get_names(argc, argv)
        !            59:        int argc;
        !            60:        char *argv[];
        !            61: {
        !            62:        char hostname[MAXHOSTNAMELEN];
        !            63:        char *his_name, *my_name;
        !            64:        char *my_machine_name, *his_machine_name;
        !            65:        char *my_tty, *his_tty;
        !            66:        register char *cp;
        !            67:        char *names;
        !            68:
        !            69:        if (argc < 2 ) {
        !            70:                printf("Usage: talk user [ttyname]\n");
        !            71:                exit(-1);
        !            72:        }
        !            73:        if (!isatty(0)) {
        !            74:                printf("Standard input must be a tty, not a pipe or a file\n");
        !            75:                exit(-1);
        !            76:        }
        !            77:        if ((my_name = getlogin()) == NULL) {
        !            78:                struct passwd *pw;
        !            79:
        !            80:                if ((pw = getpwuid(getuid())) == NULL) {
        !            81:                        printf("You don't exist. Go away.\n");
        !            82:                        exit(-1);
        !            83:                }
        !            84:                my_name = pw->pw_name;
        !            85:        }
        !            86:        gethostname(hostname, sizeof (hostname));
        !            87:        my_machine_name = hostname;
        !            88:        /* check for, and strip out, the machine name of the target */
        !            89:        names = strdup(argv[1]);
        !            90:        for (cp = names; *cp && !index("@:!.", *cp); cp++)
        !            91:                ;
        !            92:        if (*cp == '\0') {
        !            93:                /* this is a local to local talk */
        !            94:                his_name = names;
        !            95:                his_machine_name = my_machine_name;
        !            96:        } else {
        !            97:                if (*cp++ == '@') {
        !            98:                        /* user@host */
        !            99:                        his_name = names;
        !           100:                        his_machine_name = cp;
        !           101:                } else {
        !           102:                        /* host.user or host!user or host:user */
        !           103:                        his_name = cp;
        !           104:                        his_machine_name = names;
        !           105:                }
        !           106:                *--cp = '\0';
        !           107:        }
        !           108:        if (argc > 2)
        !           109:                his_tty = argv[2];      /* tty name is arg 2 */
        !           110:        else
        !           111:                his_tty = "";
        !           112:        get_addrs(my_machine_name, his_machine_name);
        !           113:        /*
        !           114:         * Initialize the message template.
        !           115:         */
        !           116:        msg.vers = TALK_VERSION;
        !           117:        msg.addr.sa_family = htons(AF_INET);
        !           118:        msg.ctl_addr.sa_family = htons(AF_INET);
        !           119:        msg.id_num = htonl(0);
        !           120:        strncpy(msg.l_name, my_name, NAME_SIZE);
        !           121:        msg.l_name[NAME_SIZE - 1] = '\0';
        !           122:        strncpy(msg.r_name, his_name, NAME_SIZE);
        !           123:        msg.r_name[NAME_SIZE - 1] = '\0';
        !           124:        strncpy(msg.r_tty, his_tty, TTY_SIZE);
        !           125:        msg.r_tty[TTY_SIZE - 1] = '\0';
        !           126: }