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util-src/net.c @ 12591:494577d883ff
util.table: Fix inaccurate comment
Probably a duplicate of the comment next to Lmove, recorded by mistake
Lpack can probably be removed at some point in the near future once we
are confident it is not used anywhere.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Mon, 11 Jul 2022 20:02:10 +0200 |
parent | 12575:1f6f05a98fcd |
child | 12976:a187600ec7d6 |
line wrap: on
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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 -- */ #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif #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 < 504) #define luaL_pushfail lua_pushnil #endif /* Enumerate all locally configured IP addresses */ static 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 uint32_t ip4_linklocal = htonl(0xa9fe0000); /* 169.254.0.0 */ const uint32_t 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) { luaL_pushfail(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; luaL_pushfail(L); lua_pushstring(L, strerror(errno_)); lua_pushinteger(L, errno_); return 3; default: case 0: luaL_pushfail(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 { luaL_pushfail(L); lua_pushstring(L, strerror(EAFNOSUPPORT)); lua_pushinteger(L, EAFNOSUPPORT); return 3; } if(!inet_ntop(family, ipaddr, buf, INET6_ADDRSTRLEN)) { errno_ = errno; luaL_pushfail(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) { luaL_checkversion(L); 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; }