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Annotation of 43BSDReno/usr.bin/talk/get_addrs.c, revision 1.1.1.1

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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