banan-os/userspace/libraries/LibC/netdb.cpp

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#include <BAN/Bitcast.h>
#include <arpa/inet.h>
#include <limits.h>
#include <netdb.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
int h_errno = 0;
struct hostent* gethostbyname(const char* name)
{
static char name_buffer[HOST_NAME_MAX + 1];
static in_addr_t addr_buffer;
static in_addr_t* addr_ptrs[2];
static struct hostent hostent;
if (strlen(name) > HOST_NAME_MAX)
return nullptr;
strcpy(name_buffer, name);
hostent.h_name = name_buffer;
hostent.h_aliases = nullptr;
hostent.h_addrtype = AF_INET;
hostent.h_length = sizeof(in_addr_t);
addr_ptrs[0] = &addr_buffer;
addr_ptrs[1] = nullptr;
hostent.h_addr_list = reinterpret_cast<char**>(addr_ptrs);
int socket = -1;
if (in_addr_t ipv4 = inet_addr(name); ipv4 != (in_addr_t)(-1))
addr_buffer = ipv4;
else
{
int socket = ::socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (socket == -1)
return nullptr;
sockaddr_un addr;
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, "/tmp/resolver.sock");
if (connect(socket, (sockaddr*)&addr, sizeof(addr)) == -1)
goto error_close_socket;
if (send(socket, name, strlen(name), 0) == -1)
goto error_close_socket;
sockaddr_storage storage;
if (recv(socket, &storage, sizeof(storage), 0) == -1)
goto error_close_socket;
close(socket);
if (storage.ss_family != AF_INET)
return nullptr;
addr_buffer = *reinterpret_cast<in_addr_t*>(storage.ss_storage);
}
return &hostent;
error_close_socket:
close(socket);
return nullptr;
}