luasocket/src/options.c

#include <lauxlib.h> 
#include <string.h> 

#include "auxiliar.h"
#include "options.h"
#include "inet.h"

static int opt_setmembership(lua_State *L, p_sock ps, int level, int name);
static int opt_setboolean(lua_State *L, p_sock ps, int level, int name);
static int opt_set(lua_State *L, p_sock ps, int level, int name, 
        void *val, int len);

/*=========================================================================*\
* Exported functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Calls appropriate option handler
\*-------------------------------------------------------------------------*/
int opt_meth_setoption(lua_State *L, p_opt opt, p_sock ps)
{
    const char *name = luaL_checkstring(L, 2);      /* obj, name, ... */
    while (opt->name && strcmp(name, opt->name))
        opt++;
    if (!opt->func) {
        char msg[45];
        sprintf(msg, "unsupported option `%.35s'", name);
        luaL_argerror(L, 2, msg);
    }
    return opt->func(L, ps);
}

/* enables reuse of local address */
int opt_reuseaddr(lua_State *L, p_sock ps)
{
    return opt_setboolean(L, ps, SOL_SOCKET, SO_REUSEADDR); 
}

/* disables the Naggle algorithm */
int opt_tcp_nodelay(lua_State *L, p_sock ps)
{
    return opt_setboolean(L, ps, IPPROTO_TCP, TCP_NODELAY); 
}

int opt_keepalive(lua_State *L, p_sock ps)
{
    return opt_setboolean(L, ps, SOL_SOCKET, SO_KEEPALIVE); 
}

int opt_dontroute(lua_State *L, p_sock ps)
{
    return opt_setboolean(L, ps, SOL_SOCKET, SO_DONTROUTE);
}

int opt_broadcast(lua_State *L, p_sock ps)
{
    return opt_setboolean(L, ps, SOL_SOCKET, SO_BROADCAST);
}

int opt_ip_multicast_loop(lua_State *L, p_sock ps)
{
    return opt_setboolean(L, ps, IPPROTO_IP, IP_MULTICAST_LOOP);
}

int opt_linger(lua_State *L, p_sock ps)
{
    struct linger li;                      /* obj, name, table */
    if (!lua_istable(L, 3)) luaL_typerror(L, 3, lua_typename(L, LUA_TTABLE));
    lua_pushstring(L, "on");
    lua_gettable(L, 3);
    if (!lua_isboolean(L, -1)) 
        luaL_argerror(L, 3, "boolean 'on' field expected");
    li.l_onoff = lua_toboolean(L, -1);
    lua_pushstring(L, "timeout");
    lua_gettable(L, 3);
    if (!lua_isnumber(L, -1)) 
        luaL_argerror(L, 3, "number 'timeout' field expected");
    li.l_linger = (int) lua_tonumber(L, -1);
    return opt_set(L, ps, SOL_SOCKET, SO_LINGER, (char *) &li, sizeof(li));
}

int opt_ip_multicast_ttl(lua_State *L, p_sock ps)
{
    int val = (int) luaL_checknumber(L, 3);    /* obj, name, int */
    return opt_set(L, ps, SOL_SOCKET, SO_LINGER, (char *) &val, sizeof(val));
}

int opt_ip_add_membership(lua_State *L, p_sock ps)
{
    return opt_setmembership(L, ps, IPPROTO_IP, IP_ADD_MEMBERSHIP);
}

int opt_ip_drop_membersip(lua_State *L, p_sock ps)
{
    return opt_setmembership(L, ps, IPPROTO_IP, IP_DROP_MEMBERSHIP);
}

/*=========================================================================*\
* Auxiliar functions
\*=========================================================================*/
static int opt_setmembership(lua_State *L, p_sock ps, int level, int name)
{
    struct ip_mreq val;                   /* obj, name, table */
    if (!lua_istable(L, 3)) luaL_typerror(L, 3, lua_typename(L, LUA_TTABLE));
    lua_pushstring(L, "multiaddr");
    lua_gettable(L, 3);
    if (!lua_isstring(L, -1)) 
        luaL_argerror(L, 3, "string 'multiaddr' field expected");
    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, 3);
    if (!lua_isstring(L, -1)) 
        luaL_argerror(L, 3, "string 'interface' field expected");
    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");
    return opt_set(L, ps, level, name, (char *) &val, sizeof(val));
}

static 
int opt_set(lua_State *L, p_sock ps, int level, int name, void *val, int len)
{
    if (setsockopt(*ps, level, name, (char *) val, len) < 0) {
        lua_pushnil(L);
        lua_pushstring(L, "setsockopt failed");
        return 2;
    }
    lua_pushnumber(L, 1);
    return 1;
}

static int opt_setboolean(lua_State *L, p_sock ps, int level, int name)
{
    int val = aux_checkboolean(L, 3);             /* obj, name, bool */
    return opt_set(L, ps, level, name, (char *) &val, sizeof(val));
}