util.net: Add util.net, containing local_addresses() (removed from LuaSocket 3.0)

diff --git a/util-src/Makefile b/util-src/Makefile
index 90d65e514d8eb68e6307aa1ecafaaf7fda298e42..3a1ba3f2af1f69f506c6ddfb93c5c4f51837e90c 100644 (file)
--- a/util-src/Makefile
+++ b/util-src/Makefile
@@ -14,9 +14,9 @@ CFLAGS+=-ggdb
 .PHONY: all install clean
 .SUFFIXES: .c .o .so
 
-all: encodings.so hashes.so pposix.so signal.so
+all: encodings.so hashes.so net.so pposix.so signal.so
 
-install: encodings.so hashes.so pposix.so signal.so
+install: encodings.so hashes.so net.so pposix.so signal.so
        install *.so ../util/
 
 clean:

diff --git a/util-src/net.c b/util-src/net.c
new file mode 100644 (file)
index 0000000..497cd95
--- /dev/null
+++ b/util-src/net.c
@@ -0,0 +1,107 @@
+/* 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
+--
+*/
+
+#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>
+#endif
+
+#include <lua.h>
+#include <lauxlib.h>
+
+/* Enumerate all locally configured IP addresses */
+
+const char * const type_strings[] = {
+       "both",
+       "ipv4",
+       "ipv6",
+       NULL
+};
+
+static int lc_local_addresses(lua_State *L)
+{
+       /* 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);
+#ifndef _WIN32
+       struct ifaddrs *addr = NULL, *a;
+       int n = 1;
+#endif
+       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;
+       }
+
+       lua_newtable(L);
+
+       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);
+
+       return 1;
+#endif
+}
+
+int luaopen_util_net(lua_State* L)
+{
+       luaL_Reg exports[] = {
+               { "local_addresses", lc_local_addresses },
+               { NULL, NULL }
+       };
+
+       luaL_register(L, "net",  exports);
+       return 1;
+}