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Annotation of src/usr.bin/talk/get_addrs.c, Revision 1.4

1.4     ! millert     1: /*     $OpenBSD: get_addrs.c,v 1.3 1998/04/28 22:13:23 pjanzen Exp $   */
1.1       deraadt     2: /*     $NetBSD: get_addrs.c,v 1.3 1994/12/09 02:14:14 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. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: #if 0
                     39: static char sccsid[] = "@(#)get_addrs.c        8.1 (Berkeley) 6/6/93";
                     40: #endif
1.4     ! millert    41: static char rcsid[] = "$OpenBSD: get_addrs.c,v 1.3 1998/04/28 22:13:23 pjanzen Exp $";
1.1       deraadt    42: #endif /* not lint */
                     43:
1.3       pjanzen    44: #include "talk.h"
1.1       deraadt    45: #include <netdb.h>
                     46: #include <stdio.h>
1.3       pjanzen    47: #include <unistd.h>
1.1       deraadt    48: #include "talk_ctl.h"
                     49:
1.3       pjanzen    50: void
1.1       deraadt    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;
1.4     ! millert    56:        extern int h_errno;
1.1       deraadt    57:
                     58:        msg.pid = htonl(getpid());
                     59:        /* look up the address of the local host */
                     60:        hp = gethostbyname(my_machine_name);
1.4     ! millert    61:        if (hp == NULL)
        !            62:                errx(1, "%s: %s", my_machine_name, hstrerror(h_errno));
1.1       deraadt    63:        bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
                     64:        /*
                     65:         * If the callee is on-machine, just copy the
                     66:         * network address, otherwise do a lookup...
                     67:         */
                     68:        if (strcmp(his_machine_name, my_machine_name)) {
                     69:                hp = gethostbyname(his_machine_name);
1.4     ! millert    70:                if (hp == NULL)
        !            71:                        errx(1, "%s: %s", his_machine_name, hstrerror(h_errno));
1.1       deraadt    72:                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
                     73:        } else
                     74:                his_machine_addr = my_machine_addr;
                     75:        /* find the server's port */
                     76:        sp = getservbyname("ntalk", "udp");
1.4     ! millert    77:        if (sp == NULL)
        !            78:                errx(1, "ntalk/udp: service is not registered.");
1.1       deraadt    79:        daemon_port = sp->s_port;
                     80: }