luasocket/src/udp.c

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/*=========================================================================*\
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* UDP object
* LuaSocket toolkit
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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>
#include <lauxlib.h>
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#include "luasocket.h"
#include "auxiliar.h"
#include "socket.h"
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#include "inet.h"
#include "udp.h"
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/*=========================================================================*\
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* Internal function prototypes
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\*=========================================================================*/
static int global_create(lua_State *L);
static int meth_send(lua_State *L);
static int meth_sendto(lua_State *L);
static int meth_receive(lua_State *L);
static int meth_receivefrom(lua_State *L);
static int meth_getsockname(lua_State *L);
static int meth_getpeername(lua_State *L);
static int meth_setsockname(lua_State *L);
static int meth_setpeername(lua_State *L);
static int meth_close(lua_State *L);
static int meth_shutdown(lua_State *L);
static int meth_setoption(lua_State *L);
static int meth_settimeout(lua_State *L);
static int meth_fd(lua_State *L);
static int meth_dirty(lua_State *L);
static int opt_dontroute(lua_State *L);
static int opt_broadcast(lua_State *L);
static int opt_reuseaddr(lua_State *L);
static int opt_ip_multicast_ttl(lua_State *L);
static int opt_ip_multicast_loop(lua_State *L);
static int opt_ip_add_membership(lua_State *L);
static int opt_ip_drop_membersip(lua_State *L);
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/* udp object methods */
static luaL_reg udp[] = {
{"setpeername", meth_setpeername},
{"setsockname", meth_setsockname},
{"getsockname", meth_getsockname},
{"getpeername", meth_getpeername},
{"send", meth_send},
{"sendto", meth_sendto},
{"receive", meth_receive},
{"receivefrom", meth_receivefrom},
{"settimeout", meth_settimeout},
{"close", meth_close},
{"shutdown", meth_shutdown},
{"setoption", meth_setoption},
{"__gc", meth_close},
{"fd", meth_fd},
{"dirty", meth_dirty},
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{NULL, NULL}
};
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/* socket options */
static luaL_reg opt[] = {
{"dontroute", opt_dontroute},
{"broadcast", opt_broadcast},
{"reuseaddr", opt_reuseaddr},
{"ip-multicast-ttl", opt_ip_multicast_ttl},
{"ip-multicast-loop", opt_ip_multicast_loop},
{"ip-add-membership", opt_ip_add_membership},
{"ip-drop-membership", opt_ip_drop_membersip},
{NULL, NULL}
};
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/* functions in library namespace */
static luaL_reg func[] = {
{"udp", global_create},
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{NULL, NULL}
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};
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
void udp_open(lua_State *L)
{
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/* create classes */
aux_newclass(L, "udp{connected}", udp);
aux_newclass(L, "udp{unconnected}", udp);
/* create class groups */
aux_add2group(L, "udp{connected}", "udp{any}");
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aux_add2group(L, "udp{unconnected}", "udp{any}");
aux_add2group(L, "udp{connected}", "select{able}");
aux_add2group(L, "udp{unconnected}", "select{able}");
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/* define library functions */
luaL_openlib(L, LUASOCKET_LIBNAME, func, 0);
lua_pop(L, 1);
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}
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/*=========================================================================*\
* Lua methods
\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Send data through connected udp socket
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\*-------------------------------------------------------------------------*/
static int meth_send(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{connected}", 1);
p_tm tm = &udp->tm;
size_t count, sent = 0;
int err;
const char *data = luaL_checklstring(L, 2, &count);
tm_markstart(tm);
err = sock_send(&udp->sock, data, count, &sent, tm_get(tm));
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if (err == IO_DONE) lua_pushnumber(L, sent);
else lua_pushnil(L);
/* a 'closed' error on an unconnected means the target address was not
* accepted by the transport layer */
io_pusherror(L, err == IO_CLOSED ? IO_REFUSED : err);
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return 2;
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}
/*-------------------------------------------------------------------------*\
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* Send data through unconnected udp socket
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\*-------------------------------------------------------------------------*/
static int meth_sendto(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
size_t count, sent = 0;
const char *data = luaL_checklstring(L, 2, &count);
const char *ip = luaL_checkstring(L, 3);
unsigned short port = (unsigned short) luaL_checknumber(L, 4);
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p_tm tm = &udp->tm;
struct sockaddr_in addr;
int err;
memset(&addr, 0, sizeof(addr));
if (!inet_aton(ip, &addr.sin_addr))
luaL_argerror(L, 3, "invalid ip address");
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
tm_markstart(tm);
err = sock_sendto(&udp->sock, data, count, &sent,
(SA *) &addr, sizeof(addr), tm_get(tm));
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if (err == IO_DONE) lua_pushnumber(L, sent);
else lua_pushnil(L);
/* a 'closed' error on an unconnected means the target address was not
* accepted by the transport layer */
io_pusherror(L, err == IO_CLOSED ? IO_REFUSED : err);
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return 2;
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}
/*-------------------------------------------------------------------------*\
* Receives data from a UDP socket
\*-------------------------------------------------------------------------*/
static int meth_receive(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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char buffer[UDP_DATAGRAMSIZE];
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size_t got, count = (size_t) luaL_optnumber(L, 2, sizeof(buffer));
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int err;
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p_tm tm = &udp->tm;
count = MIN(count, sizeof(buffer));
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tm_markstart(tm);
err = sock_recv(&udp->sock, buffer, count, &got, tm_get(tm));
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if (err == IO_DONE) lua_pushlstring(L, buffer, got);
else lua_pushnil(L);
io_pusherror(L, err);
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return 2;
}
/*-------------------------------------------------------------------------*\
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* Receives data and sender from a UDP socket
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\*-------------------------------------------------------------------------*/
static int meth_receivefrom(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
struct sockaddr_in addr;
socklen_t addr_len = sizeof(addr);
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char buffer[UDP_DATAGRAMSIZE];
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size_t got, count = (size_t) luaL_optnumber(L, 2, sizeof(buffer));
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int err;
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p_tm tm = &udp->tm;
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tm_markstart(tm);
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count = MIN(count, sizeof(buffer));
err = sock_recvfrom(&udp->sock, buffer, count, &got,
(SA *) &addr, &addr_len, tm_get(tm));
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if (err == IO_DONE) {
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lua_pushlstring(L, buffer, got);
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lua_pushstring(L, inet_ntoa(addr.sin_addr));
lua_pushnumber(L, ntohs(addr.sin_port));
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return 3;
} else {
lua_pushnil(L);
io_pusherror(L, err);
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return 2;
}
}
/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
static int meth_fd(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
lua_pushnumber(L, udp->sock);
return 1;
}
static int meth_dirty(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
(void) udp;
lua_pushboolean(L, 0);
return 1;
}
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/*-------------------------------------------------------------------------*\
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* Just call inet methods
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\*-------------------------------------------------------------------------*/
static int meth_getpeername(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{connected}", 1);
return inet_meth_getpeername(L, &udp->sock);
}
static int meth_getsockname(lua_State *L)
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{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
return inet_meth_getsockname(L, &udp->sock);
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}
/*-------------------------------------------------------------------------*\
* Option handlers
\*-------------------------------------------------------------------------*/
static int meth_setoption(lua_State *L)
{
return aux_meth_setoption(L, opt);
}
static int opt_boolean(lua_State *L, int level, int name)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
int val = aux_checkboolean(L, 2);
if (setsockopt(udp->sock, level, name, (char *) &val, sizeof(val)) < 0) {
lua_pushnil(L);
lua_pushstring(L, "setsockopt failed");
return 2;
}
lua_pushnumber(L, 1);
return 1;
}
static int opt_dontroute(lua_State *L)
{
return opt_boolean(L, SOL_SOCKET, SO_DONTROUTE);
}
static int opt_reuseaddr(lua_State *L)
{
return opt_boolean(L, SOL_SOCKET, SO_REUSEADDR);
}
static int opt_broadcast(lua_State *L)
{
return opt_boolean(L, SOL_SOCKET, SO_BROADCAST);
}
static int opt_ip_multicast_loop(lua_State *L)
{
return opt_boolean(L, IPPROTO_IP, IP_MULTICAST_LOOP);
}
static int opt_ip_multicast_ttl(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
int val = (int) luaL_checknumber(L, 2);
if (setsockopt(udp->sock, IPPROTO_IP, IP_MULTICAST_TTL,
(char *) &val, sizeof(val)) < 0) {
lua_pushnil(L);
lua_pushstring(L, "setsockopt failed");
return 2;
}
lua_pushnumber(L, 1);
return 1;
}
static int opt_membership(lua_State *L, int level, int name)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
struct ip_mreq val;
if (!lua_istable(L, 2))
luaL_typerror(L, 2, lua_typename(L, LUA_TTABLE));
lua_pushstring(L, "multiaddr");
lua_gettable(L, 2);
if (!lua_isstring(L, -1)) luaL_argerror(L, 2, "invalid 'group' field");
if (!inet_aton(lua_tostring(L, -1), &val.imr_multiaddr))
luaL_argerror(L, 3, "invalid 'multiaddr' ip address");
lua_pushstring(L, "interface");
lua_gettable(L, 2);
if (!lua_isstring(L, -1)) luaL_argerror(L, 2, "invalid 'interface' field");
val.imr_interface.s_addr = htonl(INADDR_ANY);
if (strcmp(lua_tostring(L, -1), "*") &&
!inet_aton(lua_tostring(L, -1), &val.imr_interface))
luaL_argerror(L, 3, "invalid 'interface' ip address");
if (setsockopt(udp->sock, level, name, (char *) &val, sizeof(val)) < 0) {
lua_pushnil(L);
lua_pushstring(L, "setsockopt failed");
return 2;
}
lua_pushnumber(L, 1);
return 1;
}
static int opt_ip_add_membership(lua_State *L)
{
return opt_membership(L, IPPROTO_IP, IP_ADD_MEMBERSHIP);
}
static int opt_ip_drop_membersip(lua_State *L)
{
return opt_membership(L, IPPROTO_IP, IP_DROP_MEMBERSHIP);
}
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/*-------------------------------------------------------------------------*\
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* Just call tm methods
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\*-------------------------------------------------------------------------*/
static int meth_settimeout(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
return tm_meth_settimeout(L, &udp->tm);
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}
/*-------------------------------------------------------------------------*\
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* Turns a master udp object into a client object.
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\*-------------------------------------------------------------------------*/
static int meth_setpeername(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
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p_tm tm = &udp->tm;
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const char *address = luaL_checkstring(L, 2);
int connecting = strcmp(address, "*");
unsigned short port = connecting ?
(unsigned short) luaL_checknumber(L, 3) :
(unsigned short) luaL_optnumber(L, 3, 0);
const char *err = inet_tryconnect(&udp->sock, tm, address, port);
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if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* change class to connected or unconnected depending on address */
if (connecting) aux_setclass(L, "udp{connected}", 1);
else aux_setclass(L, "udp{unconnected}", 1);
lua_pushnumber(L, 1);
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return 1;
}
/*-------------------------------------------------------------------------*\
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* Closes socket used by object
\*-------------------------------------------------------------------------*/
static int meth_close(lua_State *L)
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{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
sock_destroy(&udp->sock);
return 0;
}
/*-------------------------------------------------------------------------*\
* Shuts the connection down partially
\*-------------------------------------------------------------------------*/
static int meth_shutdown(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
const char *how = luaL_optstring(L, 2, "both");
switch (how[0]) {
case 'b':
if (strcmp(how, "both")) goto error;
sock_shutdown(&udp->sock, 2);
break;
case 's':
if (strcmp(how, "send")) goto error;
sock_shutdown(&udp->sock, 1);
break;
case 'r':
if (strcmp(how, "receive")) goto error;
sock_shutdown(&udp->sock, 0);
break;
}
return 0;
error:
luaL_argerror(L, 2, "invalid shutdown method");
return 0;
}
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/*-------------------------------------------------------------------------*\
* Turns a master object into a server object
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\*-------------------------------------------------------------------------*/
static int meth_setsockname(lua_State *L)
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{
p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
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const char *address = luaL_checkstring(L, 2);
unsigned short port = (unsigned short) luaL_checknumber(L, 3);
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const char *err = inet_trybind(&udp->sock, address, port, -1);
if (err) {
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lua_pushnil(L);
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lua_pushstring(L, err);
return 2;
}
lua_pushnumber(L, 1);
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return 1;
}
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/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master udp object
\*-------------------------------------------------------------------------*/
int global_create(lua_State *L)
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{
t_sock sock;
const char *err = inet_trycreate(&sock, SOCK_DGRAM);
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/* try to allocate a system socket */
if (!err) {
/* allocate tcp object */
p_udp udp = (p_udp) lua_newuserdata(L, sizeof(t_udp));
udp->sock = sock;
/* set its type as master object */
aux_setclass(L, "udp{unconnected}", -1);
/* initialize remaining structure fields */
tm_init(&udp->tm, -1, -1);
return 1;
} else {
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lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
}