nixio linux IO/socket api (incomplete / WIP)

8 files changed, 1178 insertions, 0 deletions

diff --git a/libs/nixio/Makefile b/libs/nixio/Makefile
new file mode 100644
index 000000000..a2ce5dae6
--- /dev/null
+++ b/libs/nixio/Makefile
@@ -0,0 +1,14 @@
+include ../../build/config.mk
+include ../../build/module.mk
+include ../../build/gccconfig.mk
+
+%.o: %.c
+	$(COMPILE) $(LUA_CFLAGS) $(FPIC) -c -o $@ $< 
+
+compile: src/nixio.o src/socket.o src/sockopt.o src/bind.o src/address.o src/select.o
+	$(LINK) $(SHLIB_FLAGS) -o src/nixio.so src/*.o
+	mkdir -p dist$(LUA_LIBRARYDIR)
+	cp src/nixio.so dist$(LUA_LIBRARYDIR)/nixio.so
+
+clean: luaclean
+	rm -f src/*.o src/*.so
diff --git a/libs/nixio/src/address.c b/libs/nixio/src/address.c
new file mode 100644
index 000000000..ae01c19ea
--- /dev/null
+++ b/libs/nixio/src/address.c
@@ -0,0 +1,259 @@
+/*
+ * 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/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <netdb.h>
+#include "nixio.h"
+
+/**
+ * getaddrinfo(host, family, port)
+ */
+static int nixio_getaddrinfo(lua_State *L) {
+	const char *host = NULL;
+	if (!lua_isnoneornil(L, 1)) {
+		host = luaL_checklstring(L, 1, NULL);
+	}
+	const char *family = luaL_optlstring(L, 2, "any", NULL);
+	const char *port = lua_tolstring(L, 3, NULL);
+
+	struct addrinfo hints, *result, *rp;
+	memset(&hints, 0, sizeof(hints));
+
+	if (!strcmp(family, "any")) {
+		hints.ai_family = AF_UNSPEC;
+	} else if (!strcmp(family, "inet")) {
+		hints.ai_family = AF_INET;
+	} else if (!strcmp(family, "inet6")) {
+		hints.ai_family = AF_INET6;
+	} else {
+		return luaL_argerror(L, 2, "supported values: any, inet, inet6");
+	}
+
+	hints.ai_socktype = 0;
+	hints.ai_protocol = 0;
+
+	int aistat = getaddrinfo(host, port, &hints, &result);
+	if (aistat) {
+		lua_pushnil(L);
+		lua_pushinteger(L, aistat);
+		lua_pushstring(L, gai_strerror(aistat));
+		return 3;
+	}
+
+	/* create socket object */
+	lua_newtable(L);
+	int i = 1;
+
+	for (rp = result; rp != NULL; rp = rp->ai_next) {
+		/* avoid duplicate results */
+		if (!port && rp->ai_socktype != SOCK_STREAM) {
+			continue;
+		}
+
+		if (rp->ai_family == AF_INET || rp->ai_family == AF_INET6) {
+			lua_createtable(L, 0, port ? 4 : 2);
+			if (rp->ai_family == AF_INET) {
+				lua_pushliteral(L, "inet");
+			} else if (rp->ai_family == AF_INET6) {
+				lua_pushliteral(L, "inet6");
+			}
+			lua_setfield(L, -2, "family");
+
+			if (port) {
+				switch (rp->ai_socktype) {
+					case SOCK_STREAM:
+						lua_pushliteral(L, "stream");
+						break;
+					case SOCK_DGRAM:
+						lua_pushliteral(L, "dgram");
+						break;
+					case SOCK_RAW:
+						lua_pushliteral(L, "raw");
+						break;
+					default:
+						lua_pushnil(L);
+						break;
+				}
+				lua_setfield(L, -2, "socktype");
+			}
+
+			char ip[INET6_ADDRSTRLEN];
+			void *binaddr = NULL;
+			uint16_t binport = 0;
+
+			if (rp->ai_family == AF_INET) {
+				struct sockaddr_in *v4addr = (struct sockaddr_in*)rp->ai_addr;
+				binport = v4addr->sin_port;
+				binaddr = (void *)&v4addr->sin_addr;
+			} else if (rp->ai_family == AF_INET6) {
+				struct sockaddr_in6 *v6addr = (struct sockaddr_in6*)rp->ai_addr;
+				binport = v6addr->sin6_port;
+				binaddr = (void *)&v6addr->sin6_addr;
+			}
+
+			if (!inet_ntop(rp->ai_family, binaddr, ip, sizeof(ip))) {
+				freeaddrinfo(result);
+				return nixio__perror(L);
+			}
+
+			if (port) {
+				lua_pushinteger(L, ntohs(binport));
+				lua_setfield(L, -2, "port");
+			}
+
+			lua_pushstring(L, ip);
+			lua_setfield(L, -2, "address");
+			lua_rawseti(L, -2, i++);
+		}
+	}
+
+	freeaddrinfo(result);
+
+	return 1;
+}
+
+/**
+ * getnameinfo(address, family)
+ */
+static int nixio_getnameinfo(lua_State *L) {
+	const char *ip = luaL_checklstring(L, 1, NULL);
+	const char *family = luaL_optlstring(L, 2, "inet", NULL);
+	char host[NI_MAXHOST];
+
+	struct sockaddr *addr = NULL;
+	socklen_t alen = 0;
+	int res;
+
+	if (!strcmp(family, "inet")) {
+		struct sockaddr_in inetaddr;
+		memset(&inetaddr, 0, sizeof(inetaddr));
+		inetaddr.sin_family = AF_INET;
+		if (inet_pton(AF_INET, ip, &inetaddr.sin_addr) < 1) {
+			return luaL_argerror(L, 1, "invalid address");
+		}
+		alen = sizeof(inetaddr);
+		addr = (struct sockaddr *)&inetaddr;
+	} else if (!strcmp(family, "inet6")) {
+		struct sockaddr_in6 inet6addr;
+		memset(&inet6addr, 0, sizeof(inet6addr));
+		inet6addr.sin6_family = AF_INET6;
+		if (inet_pton(AF_INET6, ip, &inet6addr.sin6_addr) < 1) {
+			return luaL_argerror(L, 1, "invalid address");
+		}
+		alen = sizeof(inet6addr);
+		addr = (struct sockaddr *)&inet6addr;
+	} else {
+		return luaL_argerror(L, 2, "supported values: inet, inet6");
+	}
+
+	res = getnameinfo(addr, alen, host, sizeof(host), NULL, 0, NI_NAMEREQD);
+	if (res) {
+		lua_pushnil(L);
+		lua_pushinteger(L, res);
+		lua_pushstring(L, gai_strerror(res));
+		return 3;
+	} else {
+		lua_pushstring(L, host);
+		return 1;
+	}
+}
+
+/**
+ * getsockname() / getpeername() helper
+ */
+static int nixio_sock__getname(lua_State *L, int sock) {
+	int sockfd = nixio__checksockfd(L);
+	struct sockaddr_storage addr;
+	socklen_t addrlen = sizeof(addr);
+	char ipaddr[INET6_ADDRSTRLEN];
+	void *binaddr;
+	uint16_t port;
+
+	if (sock) {
+		if (getsockname(sockfd, (struct sockaddr*)&addr, &addrlen)) {
+			return nixio__perror(L);
+		}
+	} else {
+		if (getpeername(sockfd, (struct sockaddr*)&addr, &addrlen)) {
+			return nixio__perror(L);
+		}
+	}
+
+	if (addr.ss_family == AF_INET) {
+		struct sockaddr_in *inetaddr = (struct sockaddr_in*)&addr;
+		port = inetaddr->sin_port;
+		binaddr = &inetaddr->sin_addr;
+	} else if (addr.ss_family == AF_INET6) {
+		struct sockaddr_in6 *inet6addr = (struct sockaddr_in6*)&addr;
+		port = inet6addr->sin6_port;
+		binaddr = &inet6addr->sin6_addr;
+	} else {
+		return luaL_error(L, "unknown address family");
+	}
+
+	if (!inet_ntop(addr.ss_family, binaddr, ipaddr, sizeof(ipaddr))) {
+		return nixio__perror(L);
+	}
+
+	lua_pushstring(L, ipaddr);
+	lua_pushinteger(L, ntohs(port));
+	return 2;
+}
+
+/**
+ * getsockname()
+ */
+static int nixio_sock_getsockname(lua_State *L) {
+	return nixio_sock__getname(L, 1);
+}
+
+/**
+ * getpeername()
+ */
+static int nixio_sock_getpeername(lua_State *L) {
+	return nixio_sock__getname(L, 0);
+}
+
+
+/* module table */
+static const luaL_reg R[] = {
+	{"getaddrinfo",	nixio_getaddrinfo},
+	{"getnameinfo",	nixio_getnameinfo},
+	{NULL,			NULL}
+};
+
+/* object table */
+static const luaL_reg M[] = {
+	{"getsockname",	nixio_sock_getsockname},
+	{"getpeername",	nixio_sock_getpeername},
+	{NULL,			NULL}
+};
+
+void nixio_open_address(lua_State *L) {
+	luaL_register(L, NULL, R);
+
+	lua_pushvalue(L, -2);
+	luaL_register(L, NULL, M);
+	lua_pop(L, 1);
+}
diff --git a/libs/nixio/src/bind.c b/libs/nixio/src/bind.c
new file mode 100644
index 000000000..66337eeb5
--- /dev/null
+++ b/libs/nixio/src/bind.c
@@ -0,0 +1,291 @@
+/*
+ * 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/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
+#include <string.h>
+#include <unistd.h>
+#include <netdb.h>
+#include "nixio.h"
+
+/**
+ * connect()/bind() shortcut
+ */
+static int nixio__bind_connect(lua_State *L, int do_bind) {
+	const char *host = NULL;
+	if (!lua_isnoneornil(L, 1)) {
+		host = luaL_checklstring(L, 1, NULL);
+	}
+	const char *port = luaL_checklstring(L, 2, NULL);
+	const char *family = luaL_optlstring(L, 3, "any", NULL);
+	const char *socktype = luaL_optlstring(L, 4, "stream", NULL);
+
+	struct addrinfo hints, *result, *rp;
+	memset(&hints, 0, sizeof(hints));
+
+	if (!strcmp(family, "any")) {
+		hints.ai_family = AF_UNSPEC;
+	} else if (!strcmp(family, "inet")) {
+		hints.ai_family = AF_INET;
+	} else if (!strcmp(family, "inet6")) {
+		hints.ai_family = AF_INET6;
+	} else {
+		return luaL_argerror(L, 3, "supported values: any, inet, inet6");
+	}
+
+	if (!strcmp(socktype, "any")) {
+		hints.ai_socktype = 0;
+	} else if (!strcmp(socktype, "stream")) {
+		hints.ai_socktype = SOCK_STREAM;
+	} else if (!strcmp(socktype, "dgram")) {
+		hints.ai_socktype = SOCK_DGRAM;
+	} else {
+		return luaL_argerror(L, 4, "supported values: any, stream, dgram");
+	}
+
+	if (do_bind) {
+		hints.ai_flags |= AI_PASSIVE;
+	}
+
+	hints.ai_protocol = 0;
+
+	int aistat = getaddrinfo(host, port, &hints, &result);
+	if (aistat) {
+		lua_pushnil(L);
+		lua_pushinteger(L, aistat);
+		lua_pushstring(L, gai_strerror(aistat));
+		return 3;
+	}
+
+	/* create socket object */
+	nixio_sock *sock = lua_newuserdata(L, sizeof(nixio_sock));
+	int status = -1;
+
+	for (rp = result; rp != NULL; rp = rp->ai_next) {
+		sock->fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+		if (sock->fd == -1) {
+			continue;
+		}
+
+		if (do_bind) {
+			status = bind(sock->fd, rp->ai_addr, rp->ai_addrlen);
+		} else {
+			status = connect(sock->fd, rp->ai_addr, rp->ai_addrlen);
+		}
+
+		/* on success */
+		if (!status) {
+			sock->domain = rp->ai_family;
+			sock->type = rp->ai_socktype;
+			sock->protocol = rp->ai_protocol;
+			break;
+		}
+
+		close(sock->fd);
+	}
+
+	freeaddrinfo(result);
+
+	/* on failure */
+	if (status) {
+		return nixio__perror(L);
+	}
+
+	luaL_getmetatable(L, NIXIO_META);
+	lua_setmetatable(L, -2);
+
+	return 1;
+}
+
+/**
+ * bind(host, port, [family=any], [type=any]) shortcut
+ */
+static int nixio_bind(lua_State *L) {
+	return nixio__bind_connect(L, 1);
+}
+
+/**
+ * connect(host, port, [family=any], [type=any]) shortcut
+ */
+static int nixio_connect(lua_State *L) {
+	return nixio__bind_connect(L, 0);
+}
+
+/**
+ * bind()/connect() helper
+ */
+static int nixio_sock__bind_connect(lua_State *L, int do_bind) {
+	nixio_sock *sock = nixio__checksock(L);
+	int status = -1;
+
+	if (sock->domain == AF_INET || sock->domain == AF_INET6) {
+		const char *host = NULL;
+		if (!lua_isnoneornil(L, 2)) {
+			host = luaL_checklstring(L, 2, NULL);
+		}
+		const char *port = luaL_checklstring(L, 3, NULL);
+
+		struct addrinfo hints, *result, *rp;
+
+		memset(&hints, 0, sizeof(hints));
+		hints.ai_family = sock->domain;
+		hints.ai_socktype = sock->type;
+		hints.ai_protocol = sock->protocol;
+
+		if (do_bind) {
+			hints.ai_flags |= AI_PASSIVE;
+		}
+
+		int aistat = getaddrinfo(host, port, &hints, &result);
+		if (aistat) {
+			lua_pushnil(L);
+			lua_pushinteger(L, aistat);
+			lua_pushstring(L, gai_strerror(aistat));
+			return 3;
+		}
+
+		for (rp = result; rp != NULL; rp = rp->ai_next) {
+			if (do_bind) {
+				status = bind(sock->fd, rp->ai_addr, rp->ai_addrlen);
+			} else {
+				status = connect(sock->fd, rp->ai_addr, rp->ai_addrlen);
+			}
+
+			/* on success */
+			if (!status) {
+				break;
+			}
+		}
+
+		freeaddrinfo(result);
+	} else if (sock->domain == AF_UNIX) {
+		size_t pathlen;
+		const char *path = luaL_checklstring(L, 2, &pathlen);
+
+		struct sockaddr_un addr;
+		addr.sun_family = AF_UNIX;
+		luaL_argcheck(L, pathlen < sizeof(addr.sun_path), 2, "out of range");
+		strncpy(addr.sun_path, path, sizeof(addr.sun_path));
+
+		if (do_bind) {
+			status = bind(sock->fd, (struct sockaddr*)&addr, sizeof(addr));
+		} else {
+			status = connect(sock->fd, (struct sockaddr*)&addr, sizeof(addr));
+		}
+	} else {
+		return luaL_error(L, "not supported");
+	}
+	return nixio__pstatus(L, !status);
+}
+
+/**
+ * bind()
+ */
+static int nixio_sock_bind(lua_State *L) {
+	return nixio_sock__bind_connect(L, 1);
+}
+
+/**
+ * connect()
+ */
+static int nixio_sock_connect(lua_State *L) {
+	return nixio_sock__bind_connect(L, 0);
+}
+
+/**
+ * listen()
+ */
+static int nixio_sock_listen(lua_State *L) {
+	int sockfd = nixio__checksockfd(L);
+	lua_Integer backlog = luaL_checkinteger(L, 2);
+	return nixio__pstatus(L, !listen(sockfd, backlog));
+}
+
+/**
+ * accept()
+ */
+static int nixio_sock_accept(lua_State *L) {
+	nixio_sock *sock = nixio__checksock(L);
+	struct sockaddr_storage addr;
+	socklen_t addrlen = sizeof(addr);
+	char ipaddr[INET6_ADDRSTRLEN];
+	void *binaddr;
+	uint16_t port;
+
+	int newfd = accept(sock->fd, (struct sockaddr *)&addr, &addrlen);
+	if (newfd < 0) {
+		return nixio__perror(L);
+	}
+
+	/* create userdata */
+	nixio_sock *clsock = lua_newuserdata(L, sizeof(nixio_sock));
+	luaL_getmetatable(L, NIXIO_META);
+	lua_setmetatable(L, -2);
+
+	memcpy(clsock, sock, sizeof(clsock));
+	clsock->fd = newfd;
+
+	if (addr.ss_family == AF_INET) {
+		struct sockaddr_in *inetaddr = (struct sockaddr_in*)&addr;
+		port = inetaddr->sin_port;
+		binaddr = &inetaddr->sin_addr;
+	} else if (addr.ss_family == AF_INET6) {
+		struct sockaddr_in6 *inet6addr = (struct sockaddr_in6*)&addr;
+		port = inet6addr->sin6_port;
+		binaddr = &inet6addr->sin6_addr;
+	} else {
+		return luaL_error(L, "unknown address family");
+	}
+
+	if (!inet_ntop(addr.ss_family, binaddr, ipaddr, sizeof(ipaddr))) {
+		return nixio__perror(L);
+	}
+
+	lua_pushstring(L, ipaddr);
+	lua_pushinteger(L, ntohs(port));
+	return 3;
+}
+
+/* module table */
+static const luaL_reg R[] = {
+	{"bind",		nixio_bind},
+	{"connect",		nixio_connect},
+	{NULL,			NULL}
+};
+
+/* object table */
+static const luaL_reg M[] = {
+	{"bind",		nixio_sock_bind},
+	{"connect",		nixio_sock_connect},
+	{"listen",		nixio_sock_listen},
+	{"accept",		nixio_sock_accept},
+	{NULL,			NULL}
+};
+
+void nixio_open_bind(lua_State *L) {
+	luaL_register(L, NULL, R);
+
+	lua_pushvalue(L, -2);
+	luaL_register(L, NULL, M);
+	lua_pop(L, 1);
+}
diff --git a/libs/nixio/src/nixio.c b/libs/nixio/src/nixio.c
new file mode 100644
index 000000000..1152f2cc8
--- /dev/null
+++ b/libs/nixio/src/nixio.c
@@ -0,0 +1,122 @@
+/*
+ * 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 <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include "nixio.h"
+
+#define VERSION 0.1
+
+
+/* pushes nil, error number and errstring on the stack */
+int nixio__perror(lua_State *L) {
+    lua_pushnil(L);
+    lua_pushinteger(L, errno);
+    lua_pushstring(L, strerror(errno));
+    return 3;
+}
+
+/* pushes true, if operation succeeded, otherwise call nixio__perror */
+int nixio__pstatus(lua_State *L, int condition) {
+	if (condition) {
+		lua_pushboolean(L, 1);
+		return 1;
+	} else {
+		return nixio__perror(L);
+	}
+}
+
+/* checks whether the first argument is a socket and returns it */
+nixio_sock* nixio__checksock(lua_State *L) {
+    nixio_sock *sock = (nixio_sock*)luaL_checkudata(L, 1, NIXIO_META);
+    luaL_argcheck(L, sock->fd != -1, 1, "invalid socket object");
+    return sock;
+}
+
+/* read fd from nixio_sock object */
+int nixio__checksockfd(lua_State *L) {
+	return nixio__checksock(L)->fd;
+}
+
+/* return any possible fd, otherwise error out */
+int nixio__checkfd(lua_State *L, int ud) {
+	int fd = nixio__tofd(L, ud);
+	return (fd != -1) ? fd : luaL_argerror(L, ud, "invalid file descriptor");
+}
+
+/* return any possible fd */
+int nixio__tofd(lua_State *L, int ud) {
+	void *udata = lua_touserdata(L, ud);
+	int fd = -1;
+	if (udata && lua_getmetatable(L, ud)) {
+		luaL_getmetatable(L, NIXIO_META);
+		luaL_getmetatable(L, LUA_FILEHANDLE);
+		if (lua_rawequal(L, -2, -3)) {
+			fd = ((nixio_sock*)udata)->fd;
+		} else if (lua_rawequal(L, -1, -3)) {
+			fd = fileno(*((FILE **)udata));
+		}
+		lua_pop(L, 3);
+	}
+	return fd;
+}
+
+/* object table */
+static const luaL_reg R[] = {
+	{NULL,			NULL}
+};
+
+/* entry point */
+LUALIB_API int luaopen_nixio(lua_State *L) {
+	/* create metatable */
+	luaL_newmetatable(L, NIXIO_META);
+
+	/* method table */
+	lua_newtable(L);
+	lua_pushvalue(L, -1);
+
+	/* metatable.__index = M */
+	lua_setfield(L, -3, "__index");
+	lua_remove(L, -2);
+
+	/* register module */
+	luaL_register(L, "nixio", R);
+
+	/* register methods */
+	nixio_open_socket(L);
+	nixio_open_sockopt(L);
+	nixio_open_bind(L);
+	nixio_open_address(L);
+	nixio_open_select(L);
+
+	/* module version */
+	lua_pushnumber(L, VERSION);
+	lua_setfield(L, -2, "version");
+
+	/* remove meta table */
+	lua_remove(L, -2);
+
+	return 1;
+}
diff --git a/libs/nixio/src/nixio.h b/libs/nixio/src/nixio.h
new file mode 100644
index 000000000..ce79c9aa6
--- /dev/null
+++ b/libs/nixio/src/nixio.h
@@ -0,0 +1,31 @@
+#ifndef NIXIO_H_
+#define NIXIO_H_
+
+#define NIXIO_META "nixio.socket"
+
+struct nixio_socket {
+	int fd;
+	int domain;
+	int type;
+	int protocol;
+};
+
+typedef struct nixio_socket nixio_sock;
+
+int nixio__perror(lua_State *L);
+int nixio__pstatus(lua_State *L, int condition);
+nixio_sock* nixio__checksock(lua_State *L);
+int nixio__checksockfd(lua_State *L);
+int nixio__checkfd(lua_State *L, int ud);
+int nixio__tofd(lua_State *L, int ud);
+
+/* Module functions */
+void nixio_open_socket(lua_State *L);
+void nixio_open_sockopt(lua_State *L);
+void nixio_open_bind(lua_State *L);
+void nixio_open_address(lua_State *L);
+void nixio_open_select(lua_State *L);
+
+/* Method functions */
+
+#endif /* NIXIO_H_ */
diff --git a/libs/nixio/src/select.c b/libs/nixio/src/select.c
new file mode 100644
index 000000000..e88075ce4
--- /dev/null
+++ b/libs/nixio/src/select.c
@@ -0,0 +1,110 @@
+/*
+ * 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/select.h>
+#include "nixio.h"
+
+static int nixio_select(lua_State *L) {
+	int nfds = 0, tmpfd = -1, i = 0, j = 0, o = 0, k, tlen;
+	fd_set rfds, wfds, xfds;
+	fd_set *fdsets[3] = {&rfds, &wfds, &xfds};
+	FD_ZERO(fdsets[0]);
+	FD_ZERO(fdsets[1]);
+	FD_ZERO(fdsets[2]);
+
+	struct timeval timeout;
+	timeout.tv_sec = luaL_optinteger(L, 4, 0);
+	timeout.tv_usec = luaL_optinteger(L, 5, 0);
+
+	/* create fdsets */
+	for (i=0; i<3; i++) {
+		o = i + 1;
+		if (lua_isnoneornil(L, o)) {
+			fdsets[i] = NULL;
+			continue;
+		}
+
+		luaL_checktype(L, o, LUA_TTABLE);
+		tlen = lua_objlen(L, o);
+		luaL_argcheck(L, tlen <= FD_SETSIZE, o, "too many fds");
+
+		for (j=1; j<=tlen; j++) {
+			lua_rawgeti(L, o, j);
+			tmpfd = nixio__checkfd(L, -1);
+			FD_SET(tmpfd, fdsets[i]);
+			if (tmpfd >= nfds) {
+				nfds = tmpfd + 1;
+			}
+			lua_pop(L, 1);
+		}
+	}
+
+	int stat = select(nfds, fdsets[0], fdsets[1], fdsets[2], &timeout);
+
+	if (stat < 0) {
+		return nixio__perror(L);
+	} else if (stat == 0) {
+		lua_pushinteger(L, stat);
+		for (i=1; i<=3; i++) {
+			if (lua_isnoneornil(L, i)) {
+				lua_pushnil(L);
+			} else {
+				lua_newtable(L);
+			}
+		}
+	} else {
+		lua_pushinteger(L, stat);
+
+		/* create return tables */
+		for (i=0; i<3; i++) {
+			o = i + 1;
+			if (lua_isnoneornil(L, o)) {
+				lua_pushnil(L);
+				continue;
+			}
+
+			lua_newtable(L);
+			tlen = lua_objlen(L, o);
+			k = 1;
+
+			for (j=1; j<=tlen; j++) {
+				lua_rawgeti(L, o, j);
+				tmpfd = nixio__tofd(L, -1);
+				if (FD_ISSET(tmpfd, fdsets[i])) {
+					lua_rawseti(L, -2, k++);
+				} else {
+					lua_pop(L, 1);
+				}
+			}
+		}
+	}
+	return 4;
+}
+
+/* module table */
+static const luaL_reg R[] = {
+	{"select",	nixio_select},
+	{NULL,			NULL}
+};
+
+void nixio_open_select(lua_State *L) {
+	luaL_register(L, NULL, R);
+}
diff --git a/libs/nixio/src/socket.c b/libs/nixio/src/socket.c
new file mode 100644
index 000000000..acfa9aeb2
--- /dev/null
+++ b/libs/nixio/src/socket.c
@@ -0,0 +1,163 @@
+/*
+ * 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);
+}
diff --git a/libs/nixio/src/sockopt.c b/libs/nixio/src/sockopt.c
new file mode 100644
index 000000000..f1a326c75
--- /dev/null
+++ b/libs/nixio/src/sockopt.c
@@ -0,0 +1,188 @@
+/*
+ * 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 <netinet/tcp.h>
+#include <sys/time.h>
+#include <string.h>
+#include <fcntl.h>
+#include "nixio.h"
+
+/**
+ * setblocking()
+ */
+static int nixio_sock_setblocking(lua_State *L) {
+	int fd = nixio__checkfd(L, 1);
+	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);
+}
+
+/**
+ * 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")) {
+			return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_PRIORITY, set);
+		} else if (!strcmp(option, "broadcast")) {
+			return nixio__gso_int(L, sock->fd, SOL_SOCKET, SO_BROADCAST, 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 {
+			return luaL_argerror(L, 3, "supported values: keepalive, reuseaddr,"
+			 " sndbuf, rcvbuf, priority, broadcast, linger, sndtimeo, rcvtimeo"
+			);
+		}
+	} else if (!strcmp(level, "tcp")) {
+		if (sock->type != SOCK_STREAM) {
+			return luaL_error(L, "not a TCP socket");
+		}
+		if (!strcmp(option, "cork")) {
+			return nixio__gso_int(L, sock->fd, SOL_TCP, TCP_CORK, set);
+		} else if (!strcmp(option, "nodelay")) {
+			return nixio__gso_int(L, sock->fd, SOL_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, LUA_FILEHANDLE);
+	lua_pushcfunction(L, nixio_sock_setblocking);
+	lua_setfield(L, -2, "setblocking");
+	lua_pop(L, 1);
+}