banan-os/userspace/nslookup/main.cpp

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#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#define MAX(a, b) ((a) < (b) ? (b) : (a))
int main(int argc, char** argv)
{
if (argc != 2)
{
fprintf(stderr, "usage: %s DOMAIN\n", argv[0]);
return 1;
}
int socket = ::socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (socket == -1)
{
perror("socket");
return 1;
}
sockaddr_un addr;
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, "/tmp/resolver.sock");
if (connect(socket, (sockaddr*)&addr, sizeof(addr)) == -1)
{
perror("connect");
return 1;
}
if (send(socket, argv[1], strlen(argv[1]), 0) == -1)
{
perror("send");
return 1;
}
sockaddr_storage storage;
if (recv(socket, &storage, sizeof(storage), 0) == -1)
{
perror("recv");
return 1;
}
close(socket);
char buffer[MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)];
printf("%s\n", inet_ntop(storage.ss_family, storage.ss_storage, buffer, sizeof(buffer)));
return 0;
}