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>
#include "auxiliar.h"
#include "socket.h"
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#include "inet.h"
#include "options.h"
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#include "udp.h"
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/* min and max macros */
#ifndef MIN
#define MIN(x, y) ((x) < (y) ? x : y)
#endif
#ifndef MAX
#define MAX(x, y) ((x) > (y) ? x : y)
#endif
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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_setoption(lua_State *L);
static int meth_settimeout(lua_State *L);
static int meth_getfd(lua_State *L);
static int meth_setfd(lua_State *L);
static int meth_dirty(lua_State *L);
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/* udp object methods */
static luaL_reg udp[] = {
{"__gc", meth_close},
{"__tostring", aux_tostring},
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{"close", meth_close},
{"dirty", meth_dirty},
{"getfd", meth_getfd},
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{"getpeername", meth_getpeername},
{"getsockname", meth_getsockname},
{"receive", meth_receive},
{"receivefrom", meth_receivefrom},
{"send", meth_send},
{"sendto", meth_sendto},
{"setfd", meth_setfd},
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{"setoption", meth_setoption},
{"setpeername", meth_setpeername},
{"setsockname", meth_setsockname},
{"settimeout", meth_settimeout},
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{NULL, NULL}
};
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/* socket options */
static t_opt 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
\*-------------------------------------------------------------------------*/
int udp_open(lua_State *L)
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{
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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 */
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luaL_openlib(L, NULL, func, 0);
return 0;
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}
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/*=========================================================================*\
* Lua methods
\*=========================================================================*/
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const char *udp_strerror(int err) {
/* a 'closed' error on an unconnected means the target address was not
* accepted by the transport layer */
if (err == IO_CLOSED) return "refused";
else return sock_strerror(err);
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}
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/*-------------------------------------------------------------------------*\
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* Send data through connected udp socket
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\*-------------------------------------------------------------------------*/
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static int meth_send(lua_State *L) {
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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);
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err = sock_send(&udp->sock, data, count, &sent, tm);
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if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, udp_strerror(err));
return 2;
}
lua_pushnumber(L, sent);
return 1;
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}
/*-------------------------------------------------------------------------*\
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* Send data through unconnected udp socket
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\*-------------------------------------------------------------------------*/
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static int meth_sendto(lua_State *L) {
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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);
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err = sock_sendto(&udp->sock, data, count, &sent,
(SA *) &addr, sizeof(addr), tm);
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if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, udp_strerror(err));
return 2;
}
lua_pushnumber(L, sent);
return 1;
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}
/*-------------------------------------------------------------------------*\
* Receives data from a UDP socket
\*-------------------------------------------------------------------------*/
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static int meth_receive(lua_State *L) {
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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);
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err = sock_recv(&udp->sock, buffer, count, &got, tm);
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if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, udp_strerror(err));
return 2;
}
lua_pushlstring(L, buffer, got);
return 1;
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}
/*-------------------------------------------------------------------------*\
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* Receives data and sender from a UDP socket
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\*-------------------------------------------------------------------------*/
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static int meth_receivefrom(lua_State *L) {
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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));
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err = sock_recvfrom(&udp->sock, buffer, count, &got,
(SA *) &addr, &addr_len, 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);
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lua_pushstring(L, udp_strerror(err));
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return 2;
}
}
/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
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static int meth_getfd(lua_State *L) {
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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lua_pushnumber(L, (int) udp->sock);
return 1;
}
/* this is very dangerous, but can be handy for those that are brave enough */
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static int meth_setfd(lua_State *L) {
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
udp->sock = (t_sock) luaL_checknumber(L, 2);
return 0;
}
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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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\*-------------------------------------------------------------------------*/
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static int meth_getpeername(lua_State *L) {
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p_udp udp = (p_udp) aux_checkclass(L, "udp{connected}", 1);
return inet_meth_getpeername(L, &udp->sock);
}
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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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}
/*-------------------------------------------------------------------------*\
* Just call option handler
\*-------------------------------------------------------------------------*/
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static int meth_setoption(lua_State *L) {
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
return opt_meth_setoption(L, opt, &udp->sock);
}
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/*-------------------------------------------------------------------------*\
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* Just call tm methods
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\*-------------------------------------------------------------------------*/
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static int meth_settimeout(lua_State *L) {
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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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\*-------------------------------------------------------------------------*/
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static int meth_setpeername(lua_State *L) {
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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, address, port, tm);
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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
\*-------------------------------------------------------------------------*/
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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);
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lua_pushnumber(L, 1);
return 1;
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}
/*-------------------------------------------------------------------------*\
* Turns a master object into a server object
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\*-------------------------------------------------------------------------*/
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static int meth_setsockname(lua_State *L) {
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);
const char *err = inet_trybind(&udp->sock, address, port);
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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
\*-------------------------------------------------------------------------*/
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static int global_create(lua_State *L) {
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));
aux_setclass(L, "udp{unconnected}", -1);
/* initialize remaining structure fields */
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sock_setnonblocking(&sock);
udp->sock = sock;
tm_init(&udp->tm, -1, -1);
return 1;
} else {
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lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
}