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

1.1     ! deraadt     1: /*     $NetBSD: get_addrs.c,v 1.3 1994/12/09 02:14:14 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_addrs.c        8.1 (Berkeley) 6/6/93";
        !            39: #endif
        !            40: static char rcsid[] = "$NetBSD: get_addrs.c,v 1.3 1994/12/09 02:14:14 jtc Exp $";
        !            41: #endif /* not lint */
        !            42:
        !            43: #include <sys/types.h>
        !            44: #include <sys/socket.h>
        !            45: #include <netinet/in.h>
        !            46: #include <protocols/talkd.h>
        !            47: #include <netdb.h>
        !            48: #include <stdio.h>
        !            49: #include "talk_ctl.h"
        !            50:
        !            51: get_addrs(my_machine_name, his_machine_name)
        !            52:        char *my_machine_name, *his_machine_name;
        !            53: {
        !            54:        struct hostent *hp;
        !            55:        struct servent *sp;
        !            56:
        !            57:        msg.pid = htonl(getpid());
        !            58:        /* look up the address of the local host */
        !            59:        hp = gethostbyname(my_machine_name);
        !            60:        if (hp == NULL) {
        !            61:                fprintf(stderr, "talk: %s: ", my_machine_name);
        !            62:                herror((char *)NULL);
        !            63:                exit(-1);
        !            64:        }
        !            65:        bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
        !            66:        /*
        !            67:         * If the callee is on-machine, just copy the
        !            68:         * network address, otherwise do a lookup...
        !            69:         */
        !            70:        if (strcmp(his_machine_name, my_machine_name)) {
        !            71:                hp = gethostbyname(his_machine_name);
        !            72:                if (hp == NULL) {
        !            73:                        fprintf(stderr, "talk: %s: ", his_machine_name);
        !            74:                        herror((char *)NULL);
        !            75:                        exit(-1);
        !            76:                }
        !            77:                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
        !            78:        } else
        !            79:                his_machine_addr = my_machine_addr;
        !            80:        /* find the server's port */
        !            81:        sp = getservbyname("ntalk", "udp");
        !            82:        if (sp == 0) {
        !            83:                fprintf(stderr, "talk: %s/%s: service is not registered.\n",
        !            84:                     "ntalk", "udp");
        !            85:                exit(-1);
        !            86:        }
        !            87:        daemon_port = sp->s_port;
        !            88: }