banan-os/userspace/nslookup/main.cpp

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#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
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;
}
char buffer[128];
ssize_t nrecv = recv(socket, buffer, sizeof(buffer), 0);
if (nrecv == -1)
{
perror("recv");
return 1;
}
buffer[nrecv] = '\0';
printf("%s\n", buffer);
return 0;
}