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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
/*
* SOCK_SEQPACKET protocol is supported for AF_UNIX in Solaris 8 X/Open
* sockets, Linux 2.6.4, FreeBSD 9.0, NetBSD 6.0, and OpenBSD 5.0.
*/
/* SOCK_SEQPACKET is disabled to test SOCK_DGRAM on all platforms. */
#if (0 || NXT_HAVE_AF_UNIX_SOCK_SEQPACKET)
#define NXT_UNIX_SOCKET SOCK_SEQPACKET
#else
#define NXT_UNIX_SOCKET SOCK_DGRAM
#endif
static ssize_t nxt_sendmsg(nxt_socket_t s, nxt_fd_t fd, nxt_iobuf_t *iob,
nxt_uint_t niob);
static ssize_t nxt_recvmsg(nxt_socket_t s, nxt_fd_t *fd, nxt_iobuf_t *iob,
nxt_uint_t niob);
nxt_int_t
nxt_socketpair_create(nxt_task_t *task, nxt_socket_t *pair)
{
if (nxt_slow_path(socketpair(AF_UNIX, NXT_UNIX_SOCKET, 0, pair) != 0)) {
nxt_log(task, NXT_LOG_CRIT, "socketpair() failed %E", nxt_errno);
return NXT_ERROR;
}
nxt_debug(task, "socketpair(): %d:%d", pair[0], pair[1]);
if (nxt_slow_path(nxt_socket_nonblocking(task, pair[0]) != NXT_OK)) {
goto fail;
}
if (nxt_slow_path(fcntl(pair[0], F_SETFD, FD_CLOEXEC) == -1)) {
goto fail;
}
if (nxt_slow_path(nxt_socket_nonblocking(task, pair[1]) != NXT_OK)) {
goto fail;
}
if (nxt_slow_path(fcntl(pair[1], F_SETFD, FD_CLOEXEC) == -1)) {
goto fail;
}
return NXT_OK;
fail:
nxt_socketpair_close(task, pair);
return NXT_ERROR;
}
void
nxt_socketpair_close(nxt_task_t *task, nxt_socket_t *pair)
{
nxt_socket_close(task, pair[0]);
nxt_socket_close(task, pair[1]);
}
ssize_t
nxt_socketpair_send(nxt_fd_event_t *ev, nxt_fd_t fd, nxt_iobuf_t *iob,
nxt_uint_t niob)
{
ssize_t n;
nxt_err_t err;
for ( ;; ) {
n = nxt_sendmsg(ev->fd, fd, iob, niob);
err = (n == -1) ? nxt_socket_errno : 0;
nxt_debug(ev->task, "sendmsg(%d, %FD, %ui): %z", ev->fd, fd, niob, n);
if (n > 0) {
return n;
}
/* n == -1 */
switch (err) {
case NXT_EAGAIN:
nxt_debug(ev->task, "sendmsg(%d) not ready", ev->fd);
ev->write_ready = 0;
return NXT_AGAIN;
case NXT_EINTR:
nxt_debug(ev->task, "sendmsg(%d) interrupted", ev->fd);
continue;
default:
nxt_log(ev->task, NXT_LOG_CRIT, "sendmsg(%d, %FD, %ui) failed %E",
ev->fd, fd, niob, err);
return NXT_ERROR;
}
}
}
ssize_t
nxt_socketpair_recv(nxt_fd_event_t *ev, nxt_fd_t *fd, nxt_iobuf_t *iob,
nxt_uint_t niob)
{
ssize_t n;
nxt_err_t err;
for ( ;; ) {
n = nxt_recvmsg(ev->fd, fd, iob, niob);
err = (n == -1) ? nxt_socket_errno : 0;
nxt_debug(ev->task, "recvmsg(%d, %FD, %ui): %z", ev->fd, *fd, niob, n);
if (n > 0) {
return n;
}
if (n == 0) {
ev->closed = 1;
ev->read_ready = 0;
return n;
}
/* n == -1 */
switch (err) {
case NXT_EAGAIN:
nxt_debug(ev->task, "recvmsg(%d) not ready", ev->fd);
ev->read_ready = 0;
return NXT_AGAIN;
case NXT_EINTR:
nxt_debug(ev->task, "recvmsg(%d) interrupted", ev->fd);
continue;
default:
nxt_log(ev->task, NXT_LOG_CRIT, "recvmsg(%d, %p, %ui) failed %E",
ev->fd, fd, niob, err);
return NXT_ERROR;
}
}
}
#if (NXT_HAVE_MSGHDR_MSG_CONTROL)
/*
* Linux, FreeBSD, Solaris X/Open sockets,
* MacOSX, NetBSD, AIX, HP-UX X/Open sockets.
*/
static ssize_t
nxt_sendmsg(nxt_socket_t s, nxt_fd_t fd, nxt_iobuf_t *iob, nxt_uint_t niob)
{
struct msghdr msg;
union {
struct cmsghdr cm;
char space[CMSG_SPACE(sizeof(int))];
} cmsg;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iob;
msg.msg_iovlen = niob;
/* Flags are cleared just to suppress valgrind warning. */
msg.msg_flags = 0;
if (fd != -1) {
msg.msg_control = (caddr_t) &cmsg;
msg.msg_controllen = sizeof(cmsg);
#if (NXT_VALGRIND)
nxt_memzero(&cmsg, sizeof(cmsg));
#endif
cmsg.cm.cmsg_len = CMSG_LEN(sizeof(int));
cmsg.cm.cmsg_level = SOL_SOCKET;
cmsg.cm.cmsg_type = SCM_RIGHTS;
/*
* nxt_memcpy() is used instead of simple
* *(int *) CMSG_DATA(&cmsg.cm) = fd;
* because GCC 4.4 with -O2/3/s optimization may issue a warning:
* dereferencing type-punned pointer will break strict-aliasing rules
*
* Fortunately, GCC with -O1 compiles this nxt_memcpy()
* in the same simple assignment as in the code above.
*/
nxt_memcpy(CMSG_DATA(&cmsg.cm), &fd, sizeof(int));
} else {
msg.msg_control = NULL;
msg.msg_controllen = 0;
}
return sendmsg(s, &msg, 0);
}
static ssize_t
nxt_recvmsg(nxt_socket_t s, nxt_fd_t *fd, nxt_iobuf_t *iob, nxt_uint_t niob)
{
ssize_t n;
struct msghdr msg;
union {
struct cmsghdr cm;
char space[CMSG_SPACE(sizeof(int))];
} cmsg;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iob;
msg.msg_iovlen = niob;
msg.msg_control = (caddr_t) &cmsg;
msg.msg_controllen = sizeof(cmsg);
*fd = -1;
#if (NXT_VALGRIND)
nxt_memzero(&cmsg, sizeof(cmsg));
#endif
n = recvmsg(s, &msg, 0);
if (n > 0
&& cmsg.cm.cmsg_len == CMSG_LEN(sizeof(int))
&& cmsg.cm.cmsg_level == SOL_SOCKET
&& cmsg.cm.cmsg_type == SCM_RIGHTS)
{
/* (*fd) = *(int *) CMSG_DATA(&cmsg.cm); */
nxt_memcpy(fd, CMSG_DATA(&cmsg.cm), sizeof(int));
}
return n;
}
#else
/* Solaris 4.3BSD sockets. */
static ssize_t
nxt_sendmsg(nxt_socket_t s, nxt_fd_t fd, nxt_iobuf_t *iob, nxt_uint_t niob)
{
struct msghdr msg;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iob;
msg.msg_iovlen = niob;
if (fd != -1) {
msg.msg_accrights = (caddr_t) &fd;
msg.msg_accrightslen = sizeof(int);
} else {
msg.msg_accrights = NULL;
msg.msg_accrightslen = 0;
}
return sendmsg(s, &msg, 0);
}
static ssize_t
nxt_recvmsg(nxt_socket_t s, nxt_fd_t *fd, nxt_iobuf_t *iob, nxt_uint_t niob)
{
struct msghdr msg;
*fd = -1;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iob;
msg.msg_iovlen = niob;
msg.msg_accrights = (caddr_t) fd;
msg.msg_accrightslen = sizeof(int);
return recvmsg(s, &msg, 0);
}
#endif
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