#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

int main(int argc, char **argv) {
    struct sockaddr_storage peer;
    socklen_t peersize = sizeof peer;
    char hostname[256];
    char portname[32];

    if (getpeername(0, (struct sockaddr * restrict)&peer, &peersize) < 0) {
	perror("getpeername");
	exit(1);
    }

    int v;
    v = getnameinfo((struct sockaddr * restrict)&peer,
        sizeof(struct sockaddr_storage),
        hostname,
        sizeof(hostname),
        portname,
        sizeof(portname),
        NI_NUMERICHOST | NI_NUMERICSERV);

    if (v < 0) {
        printf("getnameinfo: %s\n", gai_strerror(v));
        exit(1);
    }

    printf("%s %s\n", hostname, portname);

    return 0;
}