/* Test setting SO_BROADCAST, connecting to the broadcast address port 1 and
   printing the local address. */

#include "udp.h"

int main(void)
{
	int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if ( fd < 0 )
		err(1, "socket");
	int enable = 1;
	if ( setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &enable, sizeof(enable)) < 0 )
		err(1, "setsockopt: SO_BROADCAST");
	struct sockaddr_in sin;
	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = htobe32(INADDR_BROADCAST);
	sin.sin_port = htobe16(1);
	if ( connect(fd, (const struct sockaddr*) &sin, sizeof(sin)) < 0 )
		err(1, "connect");
	struct sockaddr_in local;
	socklen_t locallen = sizeof(local);
	if ( getsockname(fd, (struct sockaddr*) &local, &locallen) < 0 )
		err(1, "getsockname");
	char host[INET_ADDRSTRLEN + 1];
	char port[5 + 1];
	getnameinfo((const struct sockaddr*) &local, locallen, host, sizeof(host),
	            port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV);
	if ( !strncmp(host, "192.168.1.", strlen("192.168.1.")) )
		printf("192.168.1.x");
	else
		printf("%s", host);
	printf(":");
	if ( !strcmp(port, "0") )
		printf("%s", port);
	else
		printf("non-zero");
	printf("\n");
	return 0;
}