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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include "core/nng_impl.h"
#ifdef PLATFORM_POSIX_IPC
#include "platform/posix/posix_aio.h"
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <unistd.h>
#ifdef SOCK_CLOEXEC
#define NNI_STREAM_SOCKTYPE (SOCK_STREAM | SOCK_CLOEXEC)
#else
#define NNI_STREAM_SOCKTYPE SOCK_STREAM
#endif
// Solaris/SunOS systems define this, which collides with our symbol
// names. Just undefine it now.
#ifdef sun
#undef sun
#endif
// We alias nni_posix_pipedesc to nni_plat_ipc_pipe.
// We alias nni_posix_epdesc to nni_plat_ipc_ep.
int
nni_plat_ipc_ep_init(nni_plat_ipc_ep **epp, const char *url, int mode)
{
nni_posix_epdesc * ed;
int rv;
struct sockaddr_un sun;
const char * path;
if (strncmp(url, "ipc://", strlen("ipc://")) != 0) {
return (NNG_EADDRINVAL);
}
path = url + strlen("ipc://"); // skip the prefix.
// prepare the sockaddr_un
sun.sun_family = AF_UNIX;
if (strlen(url) >= sizeof(sun.sun_path)) {
return (NNG_EADDRINVAL);
}
snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", path);
if ((rv = nni_posix_epdesc_init(&ed, url)) != 0) {
return (rv);
}
switch (mode) {
case NNI_EP_MODE_DIAL:
nni_posix_epdesc_set_remote(ed, &sun, sizeof(sun));
break;
case NNI_EP_MODE_LISTEN:
nni_posix_epdesc_set_local(ed, &sun, sizeof(sun));
break;
default:
nni_posix_epdesc_fini(ed);
return (NNG_EINVAL);
}
*epp = (void *) ed;
return (0);
}
void
nni_plat_ipc_ep_fini(nni_plat_ipc_ep *ep)
{
nni_posix_epdesc_fini((void *) ep);
}
void
nni_plat_ipc_ep_close(nni_plat_ipc_ep *ep)
{
nni_posix_epdesc_close((void *) ep);
}
// UNIX DOMAIN SOCKETS -- these have names in the file namespace.
// We are going to check to see if there was a name already there.
// If there was, and nothing is listening (ECONNREFUSED), then we
// will just try to cleanup the old socket. Note that this is not
// perfect in all scenarios, so use this with caution.
static int
nni_plat_ipc_remove_stale(const char *path)
{
int fd;
int rv;
struct sockaddr_un sun;
sun.sun_family = AF_UNIX;
snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", path);
if ((fd = socket(AF_UNIX, NNI_STREAM_SOCKTYPE, 0)) < 0) {
return (nni_plat_errno(errno));
}
// There is an assumption here that connect() returns immediately
// (even when non-blocking) when a server is absent. This seems
// to be true for the platforms we've tried. If it doesn't work,
// then the cleanup will fail. As this is supposed to be an
// exceptional case, don't worry.
(void) fcntl(fd, F_SETFL, O_NONBLOCK);
if (connect(fd, (void *) &sun, sizeof(sun)) < 0) {
if (errno == ECONNREFUSED) {
(void) unlink(path);
}
}
(void) close(fd);
return (0);
}
int
nni_plat_ipc_ep_listen(nni_plat_ipc_ep *ep)
{
const char * path;
nni_posix_epdesc * ed = (void *) ep;
struct sockaddr_un sun;
int rv;
path = nni_posix_epdesc_url(ed);
path += strlen("ipc://");
if ((rv = nni_plat_ipc_remove_stale(path)) != 0) {
return (rv);
}
return (nni_posix_epdesc_listen(ed));
}
void
nni_plat_ipc_ep_connect(nni_plat_ipc_ep *ep, nni_aio *aio)
{
nni_posix_epdesc_connect((void *) ep, aio);
}
void
nni_plat_ipc_ep_accept(nni_plat_ipc_ep *ep, nni_aio *aio)
{
nni_posix_epdesc_accept((void *) ep, aio);
}
void
nni_plat_ipc_pipe_fini(nni_plat_ipc_pipe *p)
{
nni_posix_pipedesc_fini((void *) p);
}
void
nni_plat_ipc_pipe_close(nni_plat_ipc_pipe *p)
{
nni_posix_pipedesc_close((void *) p);
}
void
nni_plat_ipc_pipe_send(nni_plat_ipc_pipe *p, nni_aio *aio)
{
nni_posix_pipedesc_send((void *) p, aio);
}
void
nni_plat_ipc_pipe_recv(nni_plat_ipc_pipe *p, nni_aio *aio)
{
nni_posix_pipedesc_recv((void *) p, aio);
}
#else
// Suppress empty symbols warnings in ranlib.
int nni_posix_ipc_not_used = 0;
#endif // PLATFORM_POSIX_IPC
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