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From 96fdf07acf78ecfc9be76a8b0591f38fe6f1a875 Mon Sep 17 00:00:00 2001
From: Steven Barth <steven@midlink.org>
Date: Sat, 9 Nov 2013 12:01:42 +0100
Subject: [PATCH] Add interface resolving
---
src/if.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/if.h | 27 ++++++++++++++
src/luasocket.c | 2 +
src/makefile | 2 +
src/options.c | 9 +++++
5 files changed, 153 insertions(+)
create mode 100644 src/if.c
create mode 100644 src/if.h
--- /dev/null
+++ b/src/if.c
@@ -0,0 +1,117 @@
+/*
+ * $Id: if.c $
+ *
+ * Author: Markus Stenberg <fingon@iki.fi>
+ *
+ * Copyright (c) 2012 cisco Systems, Inc.
+ *
+ * Created: Tue Dec 4 14:50:34 2012 mstenber
+ * Last modified: Wed Dec 5 18:51:08 2012 mstenber
+ * Edit time: 24 min
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/if.h>
+
+#include "if.h"
+
+#include "lauxlib.h"
+
+static int if_global_indextoname(lua_State *L);
+static int if_global_nametoindex(lua_State *L);
+static int if_global_nameindex(lua_State *L);
+
+static luaL_Reg func[] = {
+ { "indextoname", if_global_indextoname},
+ { "nametoindex", if_global_nametoindex},
+ { "nameindex", if_global_nameindex},
+ { NULL, NULL}
+};
+
+int if_open(lua_State *L)
+{
+ lua_pushstring(L, "iface");
+ lua_newtable(L);
+#if LUA_VERSION_NUM < 503
+ luaL_openlib(L, NULL, func, 0);
+#else
+ luaL_setfuncs(L, func, 0);
+#endif
+ lua_settable(L, -3);
+ return 0;
+}
+
+int if_global_indextoname(lua_State *L)
+{
+ unsigned int ifnumber;
+ const char *name;
+ char buf[IF_NAMESIZE+1];
+
+ if (!lua_isnumber(L, 1))
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, "indextoname expects only number argument");
+ return 2;
+ }
+ ifnumber = lua_tonumber(L, 1);
+ if (!(name = if_indextoname(ifnumber, buf)))
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, "nonexistent interface");
+ return 2;
+ }
+ lua_pushstring(L, name);
+ return 1;
+}
+
+int if_global_nametoindex(lua_State *L)
+{
+ unsigned int ifnumber;
+ if (!lua_isstring(L, 1))
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, "nametoindex expects only string argument");
+ return 2;
+ }
+ if (!(ifnumber = if_nametoindex(lua_tostring(L, 1))))
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, "nonexistent interface");
+ return 2;
+ }
+ lua_pushnumber(L, ifnumber);
+ return 1;
+}
+
+int if_global_nameindex(lua_State *L)
+{
+ struct if_nameindex *ni, *oni;
+ int i = 1;
+ oni = ni = if_nameindex();
+ lua_newtable(L);
+ while (ni && ni->if_index && *(ni->if_name))
+ {
+ /* at result[i], we store.. */
+ lua_pushnumber(L, i);
+
+ /* new table with two items - index, name*/
+ lua_newtable(L);
+ lua_pushstring(L, "index");
+ lua_pushnumber(L, ni->if_index);
+ lua_settable(L, -3);
+
+ lua_pushstring(L, "name");
+ lua_pushstring(L, ni->if_name);
+ lua_settable(L, -3);
+
+ /* Then, actually store it */
+ lua_settable(L, -3);
+
+ i++;
+ ni++;
+ }
+ if_freenameindex(oni);
+ return 1;
+}
--- /dev/null
+++ b/src/if.h
@@ -0,0 +1,27 @@
+/*
+ * $Id: if.h $
+ *
+ * Author: Markus Stenberg <fingon@iki.fi>
+ *
+ * Copyright (c) 2012 cisco Systems, Inc.
+ *
+ * Created: Tue Dec 4 14:37:24 2012 mstenber
+ * Last modified: Tue Dec 4 14:51:43 2012 mstenber
+ * Edit time: 7 min
+ *
+ */
+
+/* This module provides Lua wrapping for the advanced socket API
+ * defined in RFC3542, or mainly, the access to the system's interface
+ * list. It is necessary for use of recvmsg/sendmsg.
+ *
+ * TODO - Do something clever with Windows?
+ */
+#ifndef IF_H
+#define IF_H
+
+#include "lua.h"
+
+int if_open(lua_State *L);
+
+#endif /* IF_H */
--- a/src/luasocket.c
+++ b/src/luasocket.c
@@ -21,6 +21,7 @@
#include "tcp.h"
#include "udp.h"
#include "select.h"
+#include "if.h"
/*-------------------------------------------------------------------------*\
* Internal function prototypes
@@ -41,6 +42,7 @@ static const luaL_Reg mod[] = {
{"tcp", tcp_open},
{"udp", udp_open},
{"select", select_open},
+ {"iface", if_open},
{NULL, NULL}
};
--- a/src/makefile
+++ b/src/makefile
@@ -303,6 +303,7 @@ SOCKET_OBJS= \
compat.$(O) \
options.$(O) \
inet.$(O) \
+ if.$(O) \
$(SOCKET) \
except.$(O) \
select.$(O) \
@@ -440,6 +441,7 @@ auxiliar.$(O): auxiliar.c auxiliar.h
buffer.$(O): buffer.c buffer.h io.h timeout.h
except.$(O): except.c except.h
inet.$(O): inet.c inet.h socket.h io.h timeout.h usocket.h
+if.$(O): if.c if.h
io.$(O): io.c io.h timeout.h
luasocket.$(O): luasocket.c luasocket.h auxiliar.h except.h \
timeout.h buffer.h io.h inet.h socket.h usocket.h tcp.h \
--- a/src/options.c
+++ b/src/options.c
@@ -7,7 +7,10 @@
#include "options.h"
#include "inet.h"
#include <string.h>
-
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/if.h>
+
/*=========================================================================*\
* Internal functions prototypes
\*=========================================================================*/
@@ -414,6 +417,12 @@ static int opt_ip6_setmembership(lua_Sta
if (!lua_isnil(L, -1)) {
if (lua_isnumber(L, -1)) {
val.ipv6mr_interface = (unsigned int) lua_tonumber(L, -1);
+ } else if (lua_isstring(L, -1)) {
+ if (!(val.ipv6mr_interface = if_nametoindex(lua_tostring(L, -1)))) {
+ lua_pushnil(L);
+ lua_pushstring(L, "nonexistent interface");
+ return 2;
+ }
} else
luaL_argerror(L, -1, "number 'interface' field expected");
}
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