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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 <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "nixio.h"
/**
* create new socket
*/
static int nixio_socket(lua_State *L) {
const char *domain = luaL_optlstring(L, 1, "", NULL);
const char *type = luaL_optlstring(L, 2, "", NULL);
const char *proto = lua_tolstring(L, 3, NULL);
nixio_sock *sock = lua_newuserdata(L, sizeof(nixio_sock));
if (!strcmp(domain, "inet")) {
sock->domain = AF_INET;
} else if (!strcmp(domain, "inet6")) {
sock->domain = AF_INET6;
} else if (!strcmp(domain, "unix")) {
sock->domain = AF_UNIX;
/*} else if (!strcmp(domain, "packet")) {
sock->domain = AF_PACKET;*/
} else {
return luaL_argerror(L, 1,
"supported values: inet, inet6, unix, packet"
);
}
if (!strcmp(type, "stream")) {
sock->type = SOCK_STREAM;
} else if (!strcmp(type, "dgram")) {
sock->type = SOCK_DGRAM;
} else if (!strcmp(type, "raw")) {
sock->type = SOCK_RAW;
} else {
return luaL_argerror(L, 2, "supported values: stream, dgram, raw");
}
if (!proto) {
sock->protocol = 0;
} else if (!strcmp(proto, "icmp")) {
sock->protocol = IPPROTO_ICMP;
} else if (!strcmp(proto, "icmpv6")) {
sock->protocol = IPPROTO_ICMPV6;
} else {
return luaL_argerror(L, 3, "supported values: [empty], icmp, icmpv6");
}
/* create userdata */
luaL_getmetatable(L, NIXIO_META);
lua_setmetatable(L, -2);
sock->fd = socket(sock->domain, sock->type, sock->protocol);
if (sock->fd < 0) {
return nixio__perror(L);
}
return 1;
}
/**
* close a socket
*/
static int nixio_sock_close(lua_State *L) {
nixio_sock *sock = nixio__checksock(L);
int sockfd = sock->fd;
sock->fd = -1;
return nixio__pstatus(L, !close(sockfd));
}
/**
* garbage collector
*/
static int nixio_sock__gc(lua_State *L) {
nixio_sock *sock = (nixio_sock*)luaL_checkudata(L, 1, NIXIO_META);
if (sock && sock->fd != -1) {
close(sock->fd);
}
return 0;
}
/**
* string representation
*/
static int nixio_sock__tostring(lua_State *L) {
lua_pushfstring(L, "nixio socket %d", nixio__checksockfd(L));
return 1;
}
/**
* shutdown a socket
*/
static int nixio_sock_shutdown(lua_State *L) {
int sockfd = nixio__checksockfd(L);
const char *what = luaL_optlstring(L, 2, "rdwr", NULL);
int how;
if (!strcmp(what, "rdwr") || !strcmp(what, "both")) {
how = SHUT_RDWR;
} else if (!strcmp(what, "rd") || !strcmp(what, "read")) {
how = SHUT_RD;
} else if (!strcmp(what, "wr") || !strcmp(what, "write")) {
how = SHUT_WR;
} else {
return luaL_argerror(L, 2, "supported values: both, read, write");
}
return nixio__pstatus(L, !shutdown(sockfd, how));
}
/* module table */
static const luaL_reg R[] = {
{"socket", nixio_socket},
{NULL, NULL}
};
/* object table */
static const luaL_reg M[] = {
{"close", nixio_sock_close},
{"shutdown", nixio_sock_shutdown},
{NULL, NULL}
};
void nixio_open_socket(lua_State *L) {
luaL_getmetatable(L, NIXIO_META);
lua_pushcfunction(L, nixio_sock__gc);
lua_setfield(L, -2, "__gc");
lua_pushcfunction(L, nixio_sock__tostring);
lua_setfield(L, -2, "__tostring");
lua_pop(L, 1);
luaL_register(L, NULL, R);
lua_pushvalue(L, -2);
luaL_register(L, NULL, M);
lua_pop(L, 1);
}
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