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Usenet 1994 October
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volume4
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bridge
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part02
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get_addrs.c
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C/C++ Source or Header
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1988-05-31
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2KB
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75 lines
#ifndef lint
static char sccsid[] = "@(#)get_addrs.c 1.1 86/02/05 SMI"; /* from UCB 1.5 83/04/01 */
#endif
#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);
}
daemon_port = sp->s_port;
}