mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-11-16 10:18:21 +01:00
58bdb658aa
Few changes in internal class and group registration. Lua modules are compiled and built into library. Dynamic library tested in Linux and Mac OS X.
303 lines
9.8 KiB
C
303 lines
9.8 KiB
C
/*=========================================================================*\
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* Internet domain functions
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*
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* RCS ID: $Id$
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\*=========================================================================*/
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#include <string.h>
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#include <lua.h>
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#include <lauxlib.h>
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#include "luasocket.h"
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#include "inet.h"
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/*=========================================================================*\
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* Internal function prototypes.
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\*=========================================================================*/
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static int inet_global_toip(lua_State *L);
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static int inet_global_tohostname(lua_State *L);
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static void inet_pushresolved(lua_State *L, struct hostent *hp);
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#ifdef INET_ATON
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static int inet_aton(const char *cp, struct in_addr *inp);
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#endif
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static luaL_reg func[] = {
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{ "toip", inet_global_toip },
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{ "tohostname", inet_global_tohostname },
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{ NULL, NULL}
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};
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/*=========================================================================*\
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* Exported functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Initializes module
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\*-------------------------------------------------------------------------*/
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void inet_open(lua_State *L)
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{
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luaL_openlib(L, LUASOCKET_LIBNAME, func, 0);
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lua_pop(L, 1);
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}
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/*=========================================================================*\
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* Global Lua functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Returns all information provided by the resolver given a host name
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* or ip address
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* Lua Input: address
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* address: ip address or hostname to dns lookup
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* Lua Returns
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* On success: first IP address followed by a resolved table
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* On error: nil, followed by an error message
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\*-------------------------------------------------------------------------*/
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static int inet_global_toip(lua_State *L)
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{
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const char *address = luaL_checkstring(L, 1);
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struct in_addr addr;
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struct hostent *hp;
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if (inet_aton(address, &addr))
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hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
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else
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hp = gethostbyname(address);
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if (!hp) {
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lua_pushnil(L);
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lua_pushstring(L, sock_hoststrerror());
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return 2;
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}
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addr = *((struct in_addr *) hp->h_addr);
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lua_pushstring(L, inet_ntoa(addr));
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inet_pushresolved(L, hp);
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return 2;
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}
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/*-------------------------------------------------------------------------*\
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* Returns all information provided by the resolver given a host name
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* or ip address
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* Lua Input: address
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* address: ip address or host name to reverse dns lookup
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* Lua Returns
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* On success: canonic name followed by a resolved table
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* On error: nil, followed by an error message
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\*-------------------------------------------------------------------------*/
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static int inet_global_tohostname(lua_State *L)
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{
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const char *address = luaL_checkstring(L, 1);
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struct in_addr addr;
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struct hostent *hp;
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if (inet_aton(address, &addr))
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hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
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else
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hp = gethostbyname(address);
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if (!hp) {
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lua_pushnil(L);
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lua_pushstring(L, sock_hoststrerror());
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return 2;
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}
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lua_pushstring(L, hp->h_name);
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inet_pushresolved(L, hp);
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return 2;
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}
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/*=========================================================================*\
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* Lua methods
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Retrieves socket peer name
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* Input:
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* sock: socket
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* Lua Returns
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* On success: ip address and port of peer
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* On error: nil
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\*-------------------------------------------------------------------------*/
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int inet_meth_getpeername(lua_State *L, p_sock ps)
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{
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struct sockaddr_in peer;
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socklen_t peer_len = sizeof(peer);
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if (getpeername(*ps, (SA *) &peer, &peer_len) < 0) {
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lua_pushnil(L);
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return 1;
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}
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lua_pushstring(L, inet_ntoa(peer.sin_addr));
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lua_pushnumber(L, ntohs(peer.sin_port));
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return 2;
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}
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/*-------------------------------------------------------------------------*\
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* Retrieves socket local name
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* Input:
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* sock: socket
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* Lua Returns
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* On success: local ip address and port
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* On error: nil
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\*-------------------------------------------------------------------------*/
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int inet_meth_getsockname(lua_State *L, p_sock ps)
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{
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struct sockaddr_in local;
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socklen_t local_len = sizeof(local);
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if (getsockname(*ps, (SA *) &local, &local_len) < 0) {
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lua_pushnil(L);
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return 1;
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}
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lua_pushstring(L, inet_ntoa(local.sin_addr));
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lua_pushnumber(L, ntohs(local.sin_port));
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return 2;
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}
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/*=========================================================================*\
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* Internal functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Passes all resolver information to Lua as a table
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* Input
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* hp: hostent structure returned by resolver
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\*-------------------------------------------------------------------------*/
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static void inet_pushresolved(lua_State *L, struct hostent *hp)
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{
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char **alias;
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struct in_addr **addr;
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int i, resolved;
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lua_newtable(L); resolved = lua_gettop(L);
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lua_pushstring(L, "name");
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lua_pushstring(L, hp->h_name);
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lua_settable(L, resolved);
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lua_pushstring(L, "ip");
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lua_pushstring(L, "alias");
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i = 1;
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alias = hp->h_aliases;
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lua_newtable(L);
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while (*alias) {
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lua_pushnumber(L, i);
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lua_pushstring(L, *alias);
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lua_settable(L, -3);
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i++; alias++;
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}
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lua_settable(L, resolved);
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i = 1;
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lua_newtable(L);
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addr = (struct in_addr **) hp->h_addr_list;
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while (*addr) {
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lua_pushnumber(L, i);
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lua_pushstring(L, inet_ntoa(**addr));
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lua_settable(L, -3);
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i++; addr++;
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}
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lua_settable(L, resolved);
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}
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/*-------------------------------------------------------------------------*\
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* Tries to connect to remote address (address, port)
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* Input
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* ps: pointer to socket
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* address: host name or ip address
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* port: port number to bind to
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* Returns
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* NULL in case of success, error message otherwise
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\*-------------------------------------------------------------------------*/
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const char *inet_tryconnect(p_sock ps, const char *address, ushort port)
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{
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struct sockaddr_in remote;
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memset(&remote, 0, sizeof(remote));
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remote.sin_family = AF_INET;
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remote.sin_port = htons(port);
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if (strcmp(address, "*")) {
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if (!strlen(address) || !inet_aton(address, &remote.sin_addr)) {
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struct hostent *hp = gethostbyname(address);
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struct in_addr **addr;
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remote.sin_family = AF_INET;
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if (!hp) return sock_hoststrerror();
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addr = (struct in_addr **) hp->h_addr_list;
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memcpy(&remote.sin_addr, *addr, sizeof(struct in_addr));
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}
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} else remote.sin_family = AF_UNSPEC;
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sock_setblocking(ps);
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const char *err = sock_connect(ps, (SA *) &remote, sizeof(remote));
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if (err) {
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sock_destroy(ps);
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*ps = SOCK_INVALID;
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return err;
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} else {
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sock_setnonblocking(ps);
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return NULL;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Tries to bind socket to (address, port)
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* Input
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* sock: pointer to socket
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* address: host name or ip address
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* port: port number to bind to
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* Returns
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* NULL in case of success, error message otherwise
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\*-------------------------------------------------------------------------*/
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const char *inet_trybind(p_sock ps, const char *address, ushort port,
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int backlog)
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{
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struct sockaddr_in local;
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memset(&local, 0, sizeof(local));
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/* address is either wildcard or a valid ip address */
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local.sin_addr.s_addr = htonl(INADDR_ANY);
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local.sin_port = htons(port);
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local.sin_family = AF_INET;
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if (strcmp(address, "*") &&
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(!strlen(address) || !inet_aton(address, &local.sin_addr))) {
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struct hostent *hp = gethostbyname(address);
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struct in_addr **addr;
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if (!hp) return sock_hoststrerror();
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addr = (struct in_addr **) hp->h_addr_list;
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memcpy(&local.sin_addr, *addr, sizeof(struct in_addr));
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}
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sock_setblocking(ps);
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const char *err = sock_bind(ps, (SA *) &local, sizeof(local));
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if (err) {
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sock_destroy(ps);
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*ps = SOCK_INVALID;
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return err;
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} else {
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sock_setnonblocking(ps);
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if (backlog > 0) sock_listen(ps, backlog);
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return NULL;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Tries to create a new inet socket
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* Input
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* sock: pointer to socket
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* Returns
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* NULL if successfull, error message on error
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\*-------------------------------------------------------------------------*/
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const char *inet_trycreate(p_sock ps, int type)
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{
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return sock_create(ps, AF_INET, type, 0);
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}
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/*-------------------------------------------------------------------------*\
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* Some systems do not provide this so that we provide our own. It's not
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* marvelously fast, but it works just fine.
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\*-------------------------------------------------------------------------*/
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#ifdef COMPAT_INETATON
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static int inet_aton(const char *cp, struct in_addr *inp)
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{
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unsigned int a = 0, b = 0, c = 0, d = 0;
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int n = 0, r;
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unsigned long int addr = 0;
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r = sscanf(cp, "%u.%u.%u.%u%n", &a, &b, &c, &d, &n);
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if (r == 0 || n == 0) return 0;
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cp += n;
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if (*cp) return 0;
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if (a > 255 || b > 255 || c > 255 || d > 255) return 0;
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if (inp) {
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addr += a; addr <<= 8;
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addr += b; addr <<= 8;
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addr += c; addr <<= 8;
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addr += d;
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inp->s_addr = htonl(addr);
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}
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return 1;
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}
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#endif
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