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/* Prosody IM
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
-- Copyright (C) 2012 Paul Aurich
-- Copyright (C) 2013 Matthew Wild
-- Copyright (C) 2013 Florian Zeitz
--
*/
#define _GNU_SOURCE
#include <stddef.h>
#include <string.h>
#include <errno.h>
#ifndef _WIN32
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#endif
#include <lua.h>
#include <lauxlib.h>
#if (LUA_VERSION_NUM == 501)
#define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
#endif
/* Enumerate all locally configured IP addresses */
const char *const type_strings[] = {
"both",
"ipv4",
"ipv6",
NULL
};
static int lc_local_addresses(lua_State *L) {
#ifndef _WIN32
/* Link-local IPv4 addresses; see RFC 3927 and RFC 5735 */
const long ip4_linklocal = htonl(0xa9fe0000); /* 169.254.0.0 */
const long ip4_mask = htonl(0xffff0000);
struct ifaddrs *addr = NULL, *a;
#endif
int n = 1;
int type = luaL_checkoption(L, 1, "both", type_strings);
const char link_local = lua_toboolean(L, 2); /* defaults to 0 (false) */
const char ipv4 = (type == 0 || type == 1);
const char ipv6 = (type == 0 || type == 2);
#ifndef _WIN32
if(getifaddrs(&addr) < 0) {
lua_pushnil(L);
lua_pushfstring(L, "getifaddrs failed (%d): %s", errno,
strerror(errno));
return 2;
}
#endif
lua_newtable(L);
#ifndef _WIN32
for(a = addr; a; a = a->ifa_next) {
int family;
char ipaddr[INET6_ADDRSTRLEN];
const char *tmp = NULL;
if(a->ifa_addr == NULL || a->ifa_flags & IFF_LOOPBACK) {
continue;
}
family = a->ifa_addr->sa_family;
if(ipv4 && family == AF_INET) {
struct sockaddr_in *sa = (struct sockaddr_in *)a->ifa_addr;
if(!link_local && ((sa->sin_addr.s_addr & ip4_mask) == ip4_linklocal)) {
continue;
}
tmp = inet_ntop(family, &sa->sin_addr, ipaddr, sizeof(ipaddr));
} else if(ipv6 && family == AF_INET6) {
struct sockaddr_in6 *sa = (struct sockaddr_in6 *)a->ifa_addr;
if(!link_local && IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr)) {
continue;
}
if(IN6_IS_ADDR_V4MAPPED(&sa->sin6_addr) || IN6_IS_ADDR_V4COMPAT(&sa->sin6_addr)) {
continue;
}
tmp = inet_ntop(family, &sa->sin6_addr, ipaddr, sizeof(ipaddr));
}
if(tmp != NULL) {
lua_pushstring(L, tmp);
lua_rawseti(L, -2, n++);
}
/* TODO: Error reporting? */
}
freeifaddrs(addr);
#else
if(ipv4) {
lua_pushstring(L, "0.0.0.0");
lua_rawseti(L, -2, n++);
}
if(ipv6) {
lua_pushstring(L, "::");
lua_rawseti(L, -2, n++);
}
#endif
return 1;
}
static int lc_pton(lua_State *L) {
char buf[16];
const char *ipaddr = luaL_checkstring(L, 1);
int errno_ = 0;
int family = strchr(ipaddr, ':') ? AF_INET6 : AF_INET;
switch(inet_pton(family, ipaddr, &buf)) {
case 1:
lua_pushlstring(L, buf, family == AF_INET6 ? 16 : 4);
return 1;
case -1:
errno_ = errno;
lua_pushnil(L);
lua_pushstring(L, strerror(errno_));
lua_pushinteger(L, errno_);
return 3;
default:
case 0:
lua_pushnil(L);
lua_pushstring(L, strerror(EINVAL));
lua_pushinteger(L, EINVAL);
return 3;
}
}
static int lc_ntop(lua_State *L) {
char buf[INET6_ADDRSTRLEN];
int family;
int errno_;
size_t l;
const char *ipaddr = luaL_checklstring(L, 1, &l);
if(l == 16) {
family = AF_INET6;
}
else if(l == 4) {
family = AF_INET;
}
else {
lua_pushnil(L);
lua_pushstring(L, strerror(EAFNOSUPPORT));
lua_pushinteger(L, EAFNOSUPPORT);
return 3;
}
if(!inet_ntop(family, ipaddr, buf, INET6_ADDRSTRLEN))
{
errno_ = errno;
lua_pushnil(L);
lua_pushstring(L, strerror(errno_));
lua_pushinteger(L, errno_);
return 3;
}
lua_pushstring(L, (const char *)(&buf));
return 1;
}
int luaopen_util_net(lua_State *L) {
#if (LUA_VERSION_NUM > 501)
luaL_checkversion(L);
#endif
luaL_Reg exports[] = {
{ "local_addresses", lc_local_addresses },
{ "pton", lc_pton },
{ "ntop", lc_ntop },
{ NULL, NULL }
};
lua_createtable(L, 0, 1);
luaL_setfuncs(L, exports, 0);
return 1;
}
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