libs/luanet: add wifi channel enumeration

libs/luanet/src/iwconfig.c

@@ -13,6 +13,7 @@
  *
  *   Copyright (C) 2008 John Crispin <blogic@openwrt.org> 
  *   Copyright (C) 2008 Steven Barth <steven@midlink.org>
+ *   Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
  */
 
 #include <net/if.h>
@@ -827,3 +828,54 @@ realloc:
 	free(buffer);
 	return 0;
 }
+
+int iwc_frequencies(lua_State *L)
+{
+	int i;
+	int has_range;
+	char *ifname;
+	struct iw_range range;
+
+	if(lua_gettop(L) != 1)
+	{
+		lua_pushstring(L, "invalid arg list");
+		lua_error(L);
+		return 0;
+	}
+
+	ifname = (char *)lua_tostring (L, 1);
+
+	/* Get range stuff */
+	has_range = (iw_get_range_info(sock_iwconfig, ifname, &range) >= 0);
+
+	/* Check if the interface could support scanning. */
+	if((!has_range) || (range.we_version_compiled < 14))
+	{
+		lua_pushstring(L, "interface does not support frequency enumeration");
+		lua_error(L);
+	}
+	else
+	{
+		lua_newtable(L);
+
+		for(i = 0; i < range.num_frequency; i++)
+		{
+			lua_pushnumber(L, i + 1);
+			lua_newtable(L);
+
+			lua_pushinteger(L, 1);
+			lua_pushinteger(L, (int)range.freq[i].i);
+			lua_settable(L, -3);
+
+			lua_pushinteger(L, 2);
+			lua_pushnumber(L, iw_freq2float(&(range.freq[i])));
+			lua_settable(L, -3);
+
+			lua_settable(L, -3);
+		}
+
+		return 1;
+	}
+
+	return 0;
+}

libs/luanet/src/iwconfig.h

@@ -13,6 +13,7 @@
  *
  *   Copyright (C) 2008 John Crispin <blogic@openwrt.org> 
  *   Copyright (C) 2008 Steven Barth <steven@midlink.org>
+ *   Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
  */
 
 #ifndef _IWCONFIG_H__
@@ -25,4 +26,5 @@ int iwc_set_essid(lua_State *L);
 int iwc_set_mode(lua_State *L);
 int iwc_set_channel(lua_State *L);
 int iwc_scan(lua_State *L);
+int iwc_frequencies(lua_State *L);
 #endif

libs/luanet/src/main.c

@@ -13,6 +13,7 @@
  *
  *   Copyright (C) 2008 John Crispin <blogic@openwrt.org> 
  *   Copyright (C) 2008 Steven Barth <steven@midlink.org>
+ *   Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
  */
 
 #include <stdio.h>
@@ -63,6 +64,7 @@ static luaL_reg func[] = {
 	{"iwc_set_mode", iwc_set_mode},
 	{"iwc_set_channel", iwc_set_channel},
 	{"iwc_scan", iwc_scan},
+	{"iwc_frequencies", iwc_frequencies},
 	{"vlan_getall", vlan_getall},
 	{"vlan_add", vlan_add},
 	{"vlan_del", vlan_del},

libs/luanet/src/test.lua

@@ -93,6 +93,15 @@ if scan then
 		end
 	end
 end
+local freq = luanet.iwc_frequencies("wlan0")
+print("\nfrequencies on wlan0")
+if freq then
+	for _,f in ipairs(freq) do
+		print("  channel -> "..f[1])
+		print("  frequency -> "..f[2])
+		print("")
+	end
+end
 
 
 print("\n\n---vlan---\n")