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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#include <assert.h>
#include <stdint.h>
#include <uv.h>
#include "nvim/event/loop.h"
#include "nvim/event/socket.h"
#include "nvim/event/rstream.h"
#include "nvim/event/wstream.h"
#include "nvim/os/os.h"
#include "nvim/ascii.h"
#include "nvim/vim.h"
#include "nvim/strings.h"
#include "nvim/path.h"
#include "nvim/memory.h"
#include "nvim/macros.h"
#include "nvim/charset.h"
#include "nvim/log.h"
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "event/socket.c.generated.h"
#endif
int socket_watcher_init(Loop *loop, SocketWatcher *watcher,
const char *endpoint)
FUNC_ATTR_NONNULL_ALL
{
xstrlcpy(watcher->addr, endpoint, sizeof(watcher->addr));
char *addr = watcher->addr;
char *host_end = strrchr(addr, ':');
if (host_end && addr != host_end) {
// Split user specified address into two strings, addr(hostname) and port.
// The port part in watcher->addr will be updated later.
*host_end = '\0';
char *port = host_end + 1;
intmax_t iport;
int ret = getdigits_safe(&(char_u *){ (char_u *)port }, &iport);
if (ret == FAIL || iport < 0 || iport > UINT16_MAX) {
ELOG("Invalid port: %s", port);
return UV_EINVAL;
}
if (*port == NUL) {
// When no port is given, (uv_)getaddrinfo expects NULL otherwise the
// implementation may attempt to lookup the service by name (and fail)
port = NULL;
}
uv_getaddrinfo_t request;
int retval = uv_getaddrinfo(&loop->uv, &request, NULL, addr, port,
&(struct addrinfo){
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
});
if (retval != 0) {
ELOG("Host lookup failed: %s", endpoint);
return retval;
}
watcher->uv.tcp.addrinfo = request.addrinfo;
uv_tcp_init(&loop->uv, &watcher->uv.tcp.handle);
watcher->stream = STRUCT_CAST(uv_stream_t, &watcher->uv.tcp.handle);
} else {
uv_pipe_init(&loop->uv, &watcher->uv.pipe.handle, 0);
watcher->stream = STRUCT_CAST(uv_stream_t, &watcher->uv.pipe.handle);
}
watcher->stream->data = watcher;
watcher->cb = NULL;
watcher->close_cb = NULL;
watcher->events = NULL;
watcher->data = NULL;
return 0;
}
int socket_watcher_start(SocketWatcher *watcher, int backlog, socket_cb cb)
FUNC_ATTR_NONNULL_ALL
{
watcher->cb = cb;
int result = UV_EINVAL;
if (watcher->stream->type == UV_TCP) {
struct addrinfo *ai = watcher->uv.tcp.addrinfo;
for (; ai; ai = ai->ai_next) {
result = uv_tcp_bind(&watcher->uv.tcp.handle, ai->ai_addr, 0);
if (result != 0) {
continue;
}
result = uv_listen(watcher->stream, backlog, connection_cb);
if (result == 0) {
struct sockaddr_storage sas;
// When the endpoint in socket_watcher_init() didn't specify a port
// number, a free random port number will be assigned. sin_port will
// contain 0 in this case, unless uv_tcp_getsockname() is used first.
uv_tcp_getsockname(&watcher->uv.tcp.handle, (struct sockaddr *)&sas,
&(int){ sizeof(sas) });
uint16_t port = (uint16_t)((sas.ss_family == AF_INET)
? ((struct sockaddr_in *)&sas)->sin_port
: ((struct sockaddr_in6 *)&sas)->sin6_port);
// v:servername uses the string from watcher->addr
size_t len = strlen(watcher->addr);
snprintf(watcher->addr+len, sizeof(watcher->addr)-len, ":%" PRIu16,
ntohs(port));
break;
}
}
uv_freeaddrinfo(watcher->uv.tcp.addrinfo);
} else {
result = uv_pipe_bind(&watcher->uv.pipe.handle, watcher->addr);
if (result == 0) {
result = uv_listen(watcher->stream, backlog, connection_cb);
}
}
assert(result <= 0); // libuv should return negative error code or zero.
if (result < 0) {
if (result == UV_EACCES) {
// Libuv converts ENOENT to EACCES for Windows compatibility, but if
// the parent directory does not exist, ENOENT would be more accurate.
*path_tail((char_u *)watcher->addr) = NUL;
if (!os_path_exists((char_u *)watcher->addr)) {
result = UV_ENOENT;
}
}
return result;
}
return 0;
}
int socket_watcher_accept(SocketWatcher *watcher, Stream *stream)
FUNC_ATTR_NONNULL_ARG(1) FUNC_ATTR_NONNULL_ARG(2)
{
uv_stream_t *client;
if (watcher->stream->type == UV_TCP) {
client = STRUCT_CAST(uv_stream_t, &stream->uv.tcp);
uv_tcp_init(watcher->uv.tcp.handle.loop, (uv_tcp_t *)client);
} else {
client = STRUCT_CAST(uv_stream_t, &stream->uv.pipe);
uv_pipe_init(watcher->uv.pipe.handle.loop, (uv_pipe_t *)client, 0);
}
int result = uv_accept(watcher->stream, client);
if (result) {
uv_close((uv_handle_t *)client, NULL);
return result;
}
stream_init(NULL, stream, -1, client);
return 0;
}
void socket_watcher_close(SocketWatcher *watcher, socket_close_cb cb)
FUNC_ATTR_NONNULL_ARG(1)
{
watcher->close_cb = cb;
uv_close((uv_handle_t *)watcher->stream, close_cb);
}
static void connection_event(void **argv)
{
SocketWatcher *watcher = argv[0];
int status = (int)(uintptr_t)(argv[1]);
watcher->cb(watcher, status, watcher->data);
}
static void connection_cb(uv_stream_t *handle, int status)
{
SocketWatcher *watcher = handle->data;
CREATE_EVENT(watcher->events, connection_event, 2, watcher,
(void *)(uintptr_t)status);
}
static void close_cb(uv_handle_t *handle)
{
SocketWatcher *watcher = handle->data;
if (watcher->close_cb) {
watcher->close_cb(watcher, watcher->data);
}
}
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