#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include "DieWithMessage.h"
void PrintSocketAddress(const struct sockaddr *address, FILE *stream);
int main(int argc, char *argv[])
{
if(argc != 3)
DieWithUserMessage("Parameter(s)", "<Address/Name> <Port/Server>");
char *addrString = argv[1];
char *portString = argv[2];
struct addrinfo addrCriteria;
memset(&addrCriteria, 0, sizeof(addrCriteria));
addrCriteria.ai_family = AF_UNSPEC;
addrCriteria.ai_socktype = SOCK_STREAM;
addrCriteria.ai_protocol = IPPROTO_TCP;
struct addrinfo *addrList;
int rtnVal = getaddrinfo(addrString, portString, &addrCriteria, &addrList);
if(rtnVal != 0)
DieWithUserMessage("getaddrinfo() failed", gai_strerror(rtnVal));
struct addrinfo *addr;
for(addr = addrList; addr != NULL; addr = addr->ai_next)
{
PrintSocketAddress(addr->ai_addr, stdout);
fputc('\n', stdout);
}
freeaddrinfo(addrList);
exit(0);
}
void PrintSocketAddress(const struct sockaddr *address, FILE *stream)
{
if(address == NULL || stream == NULL)
return;
void *numericAddress;
char addrBuffer[INET6_ADDRSTRLEN];
in_port_t port;
switch(address->sa_family)
{
case AF_INET:
numericAddress = &((struct sockaddr_in* ) address)->sin_addr;
port = ntohs(((struct sockaddr_in *)address)->sin_port);
break;
case AF_INET6:
numericAddress = &((struct sockaddr_in6 *)address)->sin6_addr;
port = ntohs(((struct sockaddr_in6 *)address)->sin6_port);
break;
default:
fputs("[unknown type]", stream);
return;
}
if(inet_ntop(address->sa_family, numericAddress, addrBuffer, sizeof(addrBuffer)) == NULL)
fputs("[invalid address]", stream);
else
{
fprintf(stream, "%s", addrBuffer);
if(port != 0)
fprintf(stream, "-%u", port);
}
}