banan-os/userspace/test-tcp/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>
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");
if (nrecv <= 0)
break;
write(STDOUT_FILENO, buffer, nrecv);
}
close(socket);
return 0;
}