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/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nixio.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <net/if.h>
#include <sys/time.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include "nixio.h"
/**
* setblocking()
*/
static int nixio_sock_setblocking(lua_State *L) {
int fd = nixio__checkfd(L, 1);
luaL_checkany(L, 2);
int set = lua_toboolean(L, 2);
int flags = fcntl(fd, F_GETFL);
if (flags == -1) {
return nixio__perror(L);
}
if (!set) {
flags |= O_NONBLOCK;
} else {
flags &= ~O_NONBLOCK;
}
return nixio__pstatus(L, !fcntl(fd, F_SETFL, flags));
}
static int nixio__gso_int(lua_State *L, int fd, int level, int opt, int set) {
int value;
socklen_t optlen = sizeof(value);
if (!set) {
if (!getsockopt(fd, level, opt, &value, &optlen)) {
lua_pushinteger(L, value);
return 1;
}
} else {
value = luaL_checkinteger(L, set);
if (!setsockopt(fd, level, opt, &value, optlen)) {
lua_pushboolean(L, 1);
return 1;
}
}
return nixio__perror(L);
}
static int nixio__gso_ling(lua_State *L, int fd, int level, int opt, int set) {
struct linger value;
socklen_t optlen = sizeof(value);
if (!set) {
if (!getsockopt(fd, level, opt, &value, &optlen)) {
lua_pushinteger(L, value.l_onoff ? value.l_linger : 0);
return 1;
}
} else {
value.l_linger = luaL_checkinteger(L, set);
value.l_onoff = value.l_linger ? 1 : 0;
if (!setsockopt(fd, level, opt, &value, optlen)) {
lua_pushboolean(L, 1);
return 1;
}
}
return nixio__perror(L);
}
static int nixio__gso_timev(lua_State *L, int fd, int level, int opt, int set) {
struct timeval value;
socklen_t optlen = sizeof(value);
if (!set) {
if (!getsockopt(fd, level, opt, &value, &optlen)) {
lua_pushinteger(L, value.tv_sec);
lua_pushinteger(L, value.tv_usec);
return 2;
}
} else {
value.tv_sec = luaL_checkinteger(L, set);
value.tv_usec = luaL_optinteger(L, set + 1, 0);
if (!setsockopt(fd, level, opt, &value, optlen)) {
lua_pushboolean(L, 1);
return 1;
}
}
return nixio__perror(L);
}
#ifdef SO_BINDTODEVICE
static int nixio__gso_b(lua_State *L, int fd, int level, int opt, int set) {
if (!set) {
socklen_t optlen = IFNAMSIZ;
char ifname[IFNAMSIZ];
if (!getsockopt(fd, level, opt, ifname, &optlen)) {
lua_pushlstring(L, ifname, optlen);
return 1;
}
} else {
size_t valuelen;
const char *value = luaL_checklstring(L, set, &valuelen);
luaL_argcheck(L, valuelen <= IFNAMSIZ, set, "invalid interface name");
if (!setsockopt(fd, level, opt, value, valuelen)) {
lua_pushboolean(L, 1);
return 1;
}
}
return nixio__perror(L);
}
#endif /* SO_BINDTODEVICE */
/**
* get/setsockopt() helper
*/
static int nixio__getsetsockopt(lua_State *L, int set) {
nixio_sock *sock = nixio__checksock(L);
const char *level = luaL_optlstring(L, 2, "", NULL);
const char *option = luaL_optlstring(L, 3, "", NULL);
set = (set) ? 4 : 0;
if (!strcmp(level, "socket")) {
if (!strcmp(option, "keepalive")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_KEEPALIVE, set);
} else if (!strcmp(option, "reuseaddr")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_REUSEADDR, set);
} else if (!strcmp(option, "rcvbuf")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_RCVBUF, set);
} else if (!strcmp(option, "sndbuf")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_SNDBUF, set);
} else if (!strcmp(option, "priority")) {
#ifdef SO_PRIORITY
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_PRIORITY, set);
#else
return nixio__pstatus(L, !(errno = ENOPROTOOPT));
#endif
} else if (!strcmp(option, "broadcast")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_BROADCAST, set);
} else if (!strcmp(option, "dontroute")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_DONTROUTE, set);
} else if (!strcmp(option, "error")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_ERROR, set);
} else if (!strcmp(option, "oobinline")) {
return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_OOBINLINE, set);
} else if (!strcmp(option, "linger")) {
return nixio__gso_ling(L, sock->fd, SOL_SOCKET, SO_LINGER, set);
} else if (!strcmp(option, "sndtimeo")) {
return nixio__gso_timev(L, sock->fd, SOL_SOCKET, SO_SNDTIMEO, set);
} else if (!strcmp(option, "rcvtimeo")) {
return nixio__gso_timev(L, sock->fd, SOL_SOCKET, SO_RCVTIMEO, set);
} else if (!strcmp(option, "bindtodevice")) {
#ifdef SO_BINDTODEVICE
return nixio__gso_b(L, sock->fd, SOL_SOCKET, SO_BINDTODEVICE, set);
#else
return nixio__pstatus(L, !(errno = ENOPROTOOPT));
#endif
} else {
return luaL_argerror(L, 3, "supported values: keepalive, reuseaddr,"
" sndbuf, rcvbuf, priority, broadcast, linger, sndtimeo, rcvtimeo,"
" dontroute, bindtodevice, error, oobinline"
);
}
} else if (!strcmp(level, "tcp")) {
if (sock->type != SOCK_STREAM) {
return luaL_error(L, "not a TCP socket");
}
if (!strcmp(option, "cork")) {
#ifdef TCP_CORK
return nixio__gso_int(L, sock->fd, IPPROTO_TCP, TCP_CORK, set);
#else
return nixio__pstatus(L, !(errno = ENOPROTOOPT));
#endif
} else if (!strcmp(option, "nodelay")) {
return nixio__gso_int(L, sock->fd, IPPROTO_TCP, TCP_NODELAY, set);
} else {
return luaL_argerror(L, 3, "supported values: cork, nodelay");
}
} else {
return luaL_argerror(L, 2, "supported values: socket, tcp");
}
}
/**
* getsockopt()
*/
static int nixio_sock_getsockopt(lua_State *L) {
return nixio__getsetsockopt(L, 0);
}
/**
* setsockopt()
*/
static int nixio_sock_setsockopt(lua_State *L) {
return nixio__getsetsockopt(L, 1);
}
/* module table */
static const luaL_reg M[] = {
{"setblocking", nixio_sock_setblocking},
{"getsockopt", nixio_sock_getsockopt},
{"setsockopt", nixio_sock_setsockopt},
{NULL, NULL}
};
void nixio_open_sockopt(lua_State *L) {
lua_pushvalue(L, -2);
luaL_register(L, NULL, M);
lua_pop(L, 1);
luaL_getmetatable(L, NIXIO_FILE_META);
lua_pushcfunction(L, nixio_sock_setblocking);
lua_setfield(L, -2, "setblocking");
lua_pop(L, 1);
}
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