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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Antonin Decimo, Tarides */
/* */
/* Copyright 2021 Tarides */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include <caml/misc.h>
#include <caml/signals.h>
#include "caml/unixsupport.h"
#include <errno.h>
#ifdef HAS_SOCKETS
#include "caml/socketaddr.h"
#include <ws2tcpip.h>
extern const int caml_unix_socket_domain_table[]; /* from socket.c */
extern const int caml_unix_socket_type_table[]; /* from socket.c */
#ifdef HAS_SOCKETPAIR
#error "Windows has defined sockepair! win32unix should be updated."
#else
static int socketpair(int domain, int type, int protocol,
SOCKET socket_vector[2],
BOOL inherit)
{
wchar_t dirname[MAX_PATH + 1], path[MAX_PATH + 1];
union sock_addr_union addr;
socklen_param_type socklen;
/* POSIX states that in case of error, the contents of socket_vector
shall be unmodified. */
SOCKET listener = INVALID_SOCKET,
server = INVALID_SOCKET,
client = INVALID_SOCKET;
fd_set writefds, exceptfds;
u_long non_block, peerid = 0UL;
DWORD drc;
int rc;
if (GetTempPath(MAX_PATH + 1, dirname) == 0) {
caml_win32_maperr(GetLastError());
goto fail;
}
if (GetTempFileName(dirname, L"osp", 0U, path) == 0) {
caml_win32_maperr(GetLastError());
goto fail;
}
addr.s_unix.sun_family = PF_UNIX;
socklen = sizeof(addr.s_unix);
/* sun_path needs to be set in UTF-8 */
rc = WideCharToMultiByte(CP_UTF8, 0, path, -1, addr.s_unix.sun_path,
UNIX_PATH_MAX, NULL, NULL);
if (rc == 0) {
caml_win32_maperr(GetLastError());
goto fail_path;
}
listener = caml_win32_socket(domain, type, protocol, NULL, inherit);
if (listener == INVALID_SOCKET)
goto fail_wsa;
/* The documentation requires removing the file before binding the socket. */
if (DeleteFile(path) == 0) {
drc = GetLastError();
if (drc != ERROR_FILE_NOT_FOUND) {
caml_win32_maperr(drc);
goto fail_sockets;
}
}
rc = bind(listener, (struct sockaddr *) &addr, socklen);
if (rc == SOCKET_ERROR)
goto fail_wsa;
rc = listen(listener, 1);
if (rc == SOCKET_ERROR)
goto fail_wsa;
client = caml_win32_socket(domain, type, protocol, NULL, inherit);
if (client == INVALID_SOCKET)
goto fail_wsa;
non_block = 1UL;
if (ioctlsocket(client, FIONBIO, &non_block) == SOCKET_ERROR)
goto fail_wsa;
rc = connect(client, (struct sockaddr *) &addr, socklen);
if (rc != SOCKET_ERROR || WSAGetLastError() != WSAEWOULDBLOCK)
goto fail_wsa;
server = accept(listener, NULL, NULL);
if (server == INVALID_SOCKET)
goto fail_wsa;
rc = closesocket(listener);
listener = INVALID_SOCKET;
if (rc == SOCKET_ERROR)
goto fail_wsa;
FD_ZERO(&writefds);
FD_SET(client, &writefds);
FD_ZERO(&exceptfds);
FD_SET(client, &exceptfds);
rc = select(0 /* ignored */,
NULL, &writefds, &exceptfds,
NULL /* blocking */);
if (rc == SOCKET_ERROR
|| FD_ISSET(client, &exceptfds)
|| !FD_ISSET(client, &writefds)) {
/* We're not interested in the socket error status */
goto fail_wsa;
}
non_block = 0UL;
if (ioctlsocket(client, FIONBIO, &non_block) == SOCKET_ERROR)
goto fail_wsa;
if (DeleteFile(path) == 0) {
caml_win32_maperr(GetLastError());
goto fail_sockets;
}
rc = WSAIoctl(client, SIO_AF_UNIX_GETPEERPID,
NULL, 0U,
&peerid, sizeof(peerid), &drc /* Windows bug: always 0 */,
NULL, NULL);
if (rc == SOCKET_ERROR || peerid != GetCurrentProcessId())
goto fail_wsa;
socket_vector[0] = client;
socket_vector[1] = server;
return 0;
fail_wsa:
caml_win32_maperr(WSAGetLastError());
fail_path:
DeleteFile(path);
fail_sockets:
if(listener != INVALID_SOCKET)
closesocket(listener);
if(client != INVALID_SOCKET)
closesocket(client);
if(server != INVALID_SOCKET)
closesocket(server);
fail:
return SOCKET_ERROR;
}
CAMLprim value caml_unix_socketpair(value cloexec, value vdomain, value vtype,
value vprotocol)
{
CAMLparam4(cloexec, vdomain, vtype, vprotocol);
CAMLlocal1(result);
SOCKET sv[2];
int rc;
int domain = Int_val(vdomain);
int type = Int_val(vtype);
int protocol = Int_val(vprotocol);
caml_enter_blocking_section();
rc = socketpair(caml_unix_socket_domain_table[domain],
caml_unix_socket_type_table[type],
protocol,
sv,
! caml_unix_cloexec_p(cloexec));
caml_leave_blocking_section();
if (rc == SOCKET_ERROR)
caml_uerror("socketpair", Nothing);
result = caml_alloc_tuple(2);
Store_field(result, 0, caml_win32_alloc_socket(sv[0]));
Store_field(result, 1, caml_win32_alloc_socket(sv[1]));
CAMLreturn(result);
}
#endif /* HAS_SOCKETPAIR */
#endif /* HAS_SOCKETS */
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