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Annotation of 43BSDReno/usr.bin/talk/get_addrs.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)get_addrs.c        5.6 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include "talk_ctl.h"
        !            25: #include <netdb.h>
        !            26: 
        !            27: get_addrs(my_machine_name, his_machine_name)
        !            28:        char *my_machine_name, *his_machine_name;
        !            29: {
        !            30:        struct hostent *hp;
        !            31:        struct servent *sp;
        !            32: 
        !            33:        msg.pid = htonl(getpid());
        !            34:        /* look up the address of the local host */
        !            35:        hp = gethostbyname(my_machine_name);
        !            36:        if (hp == NULL) {
        !            37:                fprintf(stderr, "talk: %s: ", my_machine_name);
        !            38:                herror((char *)NULL);
        !            39:                exit(-1);
        !            40:        }
        !            41:        bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
        !            42:        /*
        !            43:         * If the callee is on-machine, just copy the
        !            44:         * network address, otherwise do a lookup...
        !            45:         */
        !            46:        if (strcmp(his_machine_name, my_machine_name)) {
        !            47:                hp = gethostbyname(his_machine_name);
        !            48:                if (hp == NULL) {
        !            49:                        fprintf(stderr, "talk: %s: ", his_machine_name);
        !            50:                        herror((char *)NULL);
        !            51:                        exit(-1);
        !            52:                }
        !            53:                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
        !            54:        } else
        !            55:                his_machine_addr = my_machine_addr;
        !            56:        /* find the server's port */
        !            57:        sp = getservbyname("ntalk", "udp");
        !            58:        if (sp == 0) {
        !            59:                fprintf(stderr, "talk: %s/%s: service is not registered.\n",
        !            60:                     "ntalk", "udp");
        !            61:                exit(-1);
        !            62:        }
        !            63:        daemon_port = sp->s_port;
        !            64: }

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