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/*
* This file is part of LEM, a Lua Event Machine.
* Copyright 2013 Emil Renner Berthing
*
* LEM is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* LEM is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with LEM. If not, see <http://www.gnu.org/licenses/>.
*/
struct unix_create {
struct lem_async a;
const char *path;
size_t len;
int sock;
int err;
};
static void
unix_connect_work(struct lem_async *a)
{
struct unix_create *u = (struct unix_create *)a;
struct sockaddr_un addr;
int sock;
sock = socket(AF_UNIX,
#ifdef SOCK_CLOEXEC
SOCK_CLOEXEC |
#endif
SOCK_STREAM, 0);
if (sock < 0) {
u->sock = -1;
u->err = errno;
return;
}
#ifndef SOCK_CLOEXEC
if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1) {
u->sock = -1;
u->err = errno;
goto error;
}
#endif
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, u->path, u->len+1);
if (connect(sock, (struct sockaddr *)&addr,
offsetof(struct sockaddr_un, sun_path) + u->len)) {
u->sock = -2;
u->err = errno;
goto error;
}
/* make the socket non-blocking */
if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) {
u->sock = -1;
u->err = errno;
goto error;
}
u->sock = sock;
return;
error:
close(sock);
}
static void
unix_connect_reap(struct lem_async *a)
{
struct unix_create *u = (struct unix_create *)a;
lua_State *T = u->a.T;
int sock = u->sock;
if (sock >= 0) {
free(u);
stream_new(T, sock, 2);
lem_queue(T, 1);
return;
}
lua_pushnil(T);
switch (-sock) {
case 1:
lua_pushfstring(T, "error creating socket: %s",
strerror(u->err));
break;
case 2:
lua_pushfstring(T, "error connecting to '%s': %s",
u->path, strerror(u->err));
break;
}
lem_queue(T, 2);
free(u);
}
static int
unix_connect(lua_State *T)
{
size_t len;
const char *path = luaL_checklstring(T, 1, &len);
struct unix_create *u;
if (len >= UNIX_PATH_MAX)
return luaL_argerror(T, 1, "path too long");
u = lem_xmalloc(sizeof(struct unix_create));
u->path = path;
u->len = len;
lem_async_do(&u->a, T, unix_connect_work, unix_connect_reap);
lua_settop(T, 1);
lua_pushvalue(T, lua_upvalueindex(1));
return lua_yield(T, 2);
}
static void
unix_listen_work(struct lem_async *a)
{
struct unix_create *u = (struct unix_create *)a;
struct sockaddr_un addr;
int sock;
sock = socket(AF_UNIX,
#ifdef SOCK_CLOEXEC
SOCK_CLOEXEC |
#endif
SOCK_STREAM, 0);
if (sock < 0) {
u->sock = -1;
u->err = errno;
return;
}
#ifndef SOCK_CLOEXEC
if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1) {
u->sock = -1;
u->err = errno;
goto error;
}
#endif
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, u->path, u->len+1);
if (bind(sock, (struct sockaddr *)&addr,
offsetof(struct sockaddr_un, sun_path) + u->len)) {
u->sock = -2;
u->err = errno;
goto error;
}
if (u->sock >= 0 && chmod(u->path, u->sock)) {
u->sock = -3;
u->err = errno;
goto error;
}
if (listen(sock, u->err)) {
u->sock = -4;
u->err = errno;
goto error;
}
/* make the socket non-blocking */
if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) {
u->sock = -1;
u->err = errno;
goto error;
}
u->sock = sock;
return;
error:
close(sock);
}
static void
unix_listen_reap(struct lem_async *a)
{
struct unix_create *u = (struct unix_create *)a;
lua_State *T = u->a.T;
int sock = u->sock;
if (sock >= 0) {
free(u);
server_new(T, sock, 2);
lem_queue(T, 1);
return;
}
lua_pushnil(T);
switch (-sock) {
case 1:
lua_pushfstring(T, "error creating socket: %s",
strerror(u->err));
break;
case 2:
lua_pushfstring(T, "error binding to '%s': %s",
u->path, strerror(u->err));
break;
case 3:
lua_pushfstring(T, "error setting permissions on '%s': %s",
u->path, strerror(u->err));
break;
case 4:
lua_pushfstring(T, "error listening on '%s': %s",
u->path, strerror(u->err));
break;
}
lem_queue(T, 2);
free(u);
}
static int
unix_listen(lua_State *T)
{
size_t len;
const char *path = luaL_checklstring(T, 1, &len);
int perm = io_optperm(T, 2);
int backlog = (int)luaL_optnumber(T, 3, MAXPENDING);
struct unix_create *u;
if (len >= UNIX_PATH_MAX)
return luaL_argerror(T, 1, "path too long");
u = lem_xmalloc(sizeof(struct unix_create));
u->path = path;
u->len = len;
u->sock = perm;
u->err = backlog;
lem_async_do(&u->a, T, unix_listen_work, unix_listen_reap);
lua_settop(T, 1);
lua_pushvalue(T, lua_upvalueindex(1));
return lua_yield(T, 2);
}
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