sock_ntop.c

#include "headers.h"
#include <stdio.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h> 
#include <unistd.h>
#include <stdlib.h>
#include <sys/un.h>
char * 
sock_ntop(const struct sockaddr *sa, socklen_t salen)
{
    char		portstr[8];
    static char str[128];		/* Unix domain is largest */

	switch (sa->sa_family) {
	case AF_INET: {
		struct sockaddr_in	*sin = (struct sockaddr_in *) sa;

		if (inet_ntop(AF_INET, &sin->sin_addr, str, sizeof(str)) == NULL)
			return(NULL);
		if (ntohs(sin->sin_port) != 0) {
			snprintf(portstr, sizeof(portstr), ":%d", ntohs(sin->sin_port));
			strcat(str, portstr);
		}
		return(str);
	}
/* end sock_ntop */

	case AF_INET6: {
		struct sockaddr_in6	*sin6 = (struct sockaddr_in6 *) sa;

		str[0] = '[';
		if (inet_ntop(AF_INET6, &sin6->sin6_addr, str + 1, sizeof(str) - 1) == NULL)
			return(NULL);
		if (ntohs(sin6->sin6_port) != 0) {
			snprintf(portstr, sizeof(portstr), "]:%d", ntohs(sin6->sin6_port));
			strcat(str, portstr);
			return(str);
		}
		return (str + 1);
	}
	default:
		return "";
}
}