112 lines
2.1 KiB
C++
112 lines
2.1 KiB
C++
#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>
|
|
|
|
in_addr_t get_ipv4_address(const char* query)
|
|
{
|
|
if (in_addr_t ipv4 = inet_addr(query); ipv4 != (in_addr_t)(-1))
|
|
return ipv4;
|
|
|
|
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");
|
|
close(socket);
|
|
return -1;
|
|
}
|
|
|
|
if (send(socket, query, strlen(query), 0) == -1)
|
|
{
|
|
perror("send");
|
|
close(socket);
|
|
return -1;
|
|
}
|
|
|
|
sockaddr_storage storage;
|
|
if (recv(socket, &storage, sizeof(storage), 0) == -1)
|
|
{
|
|
perror("recv");
|
|
close(socket);
|
|
return -1;
|
|
}
|
|
|
|
close(socket);
|
|
|
|
return *reinterpret_cast<in_addr_t*>(storage.ss_storage);
|
|
}
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
if (argc != 2)
|
|
{
|
|
fprintf(stderr, "usage: %s IPADDR\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
in_addr_t ipv4 = get_ipv4_address(argv[1]);
|
|
if (ipv4 == (in_addr_t)(-1))
|
|
{
|
|
fprintf(stderr, "could not parse address '%s'\n", argv[1]);
|
|
return 1;
|
|
}
|
|
|
|
int socket = ::socket(AF_INET, SOCK_STREAM, 0);
|
|
if (socket == -1)
|
|
{
|
|
perror("socket");
|
|
return 1;
|
|
}
|
|
|
|
printf("connecting to %s\n", inet_ntoa({ .s_addr = ipv4 }));
|
|
|
|
sockaddr_in server_addr;
|
|
server_addr.sin_family = AF_INET;
|
|
server_addr.sin_port = htons(80);
|
|
server_addr.sin_addr.s_addr = ipv4;
|
|
if (connect(socket, (sockaddr*)&server_addr, sizeof(server_addr)) == -1)
|
|
{
|
|
perror("connect");
|
|
return 1;
|
|
}
|
|
|
|
char request[128];
|
|
strcpy(request, "GET / HTTP/1.1\r\n");
|
|
strcat(request, "Host: "); strcat(request, argv[1]); strcat(request, "\r\n");
|
|
strcat(request, "Accept: */*\r\n");
|
|
strcat(request, "Connection: close\r\n");
|
|
strcat(request, "\r\n");
|
|
if (send(socket, request, strlen(request), 0) == -1)
|
|
{
|
|
perror("send");
|
|
return 1;
|
|
}
|
|
|
|
char buffer[1024];
|
|
for (;;)
|
|
{
|
|
ssize_t nrecv = recv(socket, buffer, sizeof(buffer), 0);
|
|
if (nrecv == -1)
|
|
{
|
|
perror("recv");
|
|
break;
|
|
}
|
|
write(STDOUT_FILENO, buffer, nrecv);
|
|
}
|
|
|
|
close(socket);
|
|
return 0;
|
|
}
|