BSD 4_2 development

[unix-history] / usr / src / ucb / talk / get_addrs.c

/* $Header: get_addrs.c 1.5 83/04/01 17:55:41 moore Exp $ */

#include "talk_ctl.h"

struct hostent *gethostbyname();
struct servent *getservbyname();

get_addrs(my_machine_name, his_machine_name)
char *my_machine_name;
char *his_machine_name;
{
   struct hostent *hp;
   struct servent *sp;

   msg.pid = getpid();

       /* look up the address of the local host */

   hp = gethostbyname(my_machine_name);

   if (hp == (struct hostent *) 0) {
       printf("This machine doesn't exist. Boy, am I confused!\n");
       exit(-1);
   }

   if (hp->h_addrtype != AF_INET) {
       printf("Protocal mix up with local machine address\n");
       exit(-1);
   }

   bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);

       /* if he is on the same machine, then simply copy */

   if ( bcmp((char *)&his_machine_name, (char *)&my_machine_name,
               sizeof(his_machine_name)) == 0) {
       bcopy((char *)&my_machine_addr, (char *)&his_machine_addr,
               sizeof(his_machine_name));
   } else {

       /* look up the address of the recipient's machine */

       hp = gethostbyname(his_machine_name);

       if (hp == (struct hostent *) 0 ) {
           printf("%s is an unknown host\n", his_machine_name);
           exit(-1);
       }

       if (hp->h_addrtype != AF_INET) {
           printf("Protocol mix up with remote machine address\n");
           exit(-1);
       }

       bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
   }

       /* find the daemon portal */

#ifdef NTALK
   sp = getservbyname("ntalk", "udp");
#else
   sp = getservbyname("talk", "udp");
#endif

   if (strcmp(sp->s_proto, "udp") != 0) {
       printf("Protocol mix up with talk daemon\n");
       exit(-1);
   }

   if (sp == 0) {
           p_error("This machine doesn't support a tcp talk daemon");
           exit(-1);
   }

   daemon_port = sp->s_port;
}