Merge 9d1aebde66eb5c669e4b6928e17cdf6bd8fb6439 into d1a9bcc4fb5a7c4f65e96de0f0561af507f627b2

preferably use the compiler(s) pre-installed on the system, then use those from `/toolchains/` if they do not exist, for the convenience of users who have not downloaded toolchains.

.gitignore

@@ -0,0 +1 @@
+/udp2raw*

makefile

@@ -1,13 +1,13 @@
 cc_cross=/home/wangyu/Desktop/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 cc_local=g++
-cc_mips24kc_be=/toolchains/lede-sdk-17.01.2-ar71xx-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-mips_24kc_gcc-5.4.0_musl-1.1.16/bin/mips-openwrt-linux-musl-g++
-cc_mips24kc_le=/toolchains/lede-sdk-17.01.2-ramips-mt7621_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.16/bin/mipsel-openwrt-linux-musl-g++
-cc_arm= /toolchains/lede-sdk-17.01.2-bcm53xx_gcc-5.4.0_musl-1.1.16_eabi.Linux-x86_64/staging_dir/toolchain-arm_cortex-a9_gcc-5.4.0_musl-1.1.16_eabi/bin/arm-openwrt-linux-c++
+cc_mips24kc_be=$(shell which g++ || /toolchains/lede-sdk-17.01.2-ar71xx-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-mips_24kc_gcc-5.4.0_musl-1.1.16/bin/mips-openwrt-linux-musl-g++)
+cc_mips24kc_le=$(shell which g++ || /toolchains/lede-sdk-17.01.2-ramips-mt7621_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.16/bin/mipsel-openwrt-linux-musl-g++)
+cc_arm= $(shell which c++ || /toolchains/lede-sdk-17.01.2-bcm53xx_gcc-5.4.0_musl-1.1.16_eabi.Linux-x86_64/staging_dir/toolchain-arm_cortex-a9_gcc-5.4.0_musl-1.1.16_eabi/bin/arm-openwrt-linux-c++)
 cc_mingw_cross=i686-w64-mingw32-g++-posix
 cc_mac_cross=o64-clang++ -stdlib=libc++
-cc_x86=/toolchains/lede-sdk-17.01.2-x86-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-i386_pentium4_gcc-5.4.0_musl-1.1.16/bin/i486-openwrt-linux-c++
-cc_amd64=/toolchains/lede-sdk-17.01.2-x86-64_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-x86_64_gcc-5.4.0_musl-1.1.16/bin/x86_64-openwrt-linux-c++
-#cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
+cc_x86=$(shell which c++ || /toolchains/lede-sdk-17.01.2-x86-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-i386_pentium4_gcc-5.4.0_musl-1.1.16/bin/i486-openwrt-linux-c++)
+cc_amd64=$(shell which c++ || /toolchains/lede-sdk-17.01.2-x86-64_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-x86_64_gcc-5.4.0_musl-1.1.16/bin/x86_64-openwrt-linux-c++)
+#cc_bcm2708=$(shell which g++ || /home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++)
 
 
 FLAGS= -std=c++11   -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers ${OPT}

network.cpp

@@ -702,7 +702,7 @@ void init_filter(int port) {
         }
     }
 
-    int dummy;
+    int dummy=0;
 
     int ret = setsockopt(raw_recv_fd, SOL_SOCKET, SO_DETACH_FILTER, &dummy, sizeof(dummy));  // in case i forgot to remove
     if (ret != 0) {
@@ -841,7 +841,7 @@ void init_filter(int port) {
 void remove_filter() {
     filter_port = 0;
 #ifdef UDP2RAW_LINUX
-    int dummy;
+    int dummy=0;
     int ret = setsockopt(raw_recv_fd, SOL_SOCKET, SO_DETACH_FILTER, &dummy, sizeof(dummy));
     if (ret != 0) {
         mylog(log_debug, "error remove fiter\n");

network.h

@@ -226,12 +226,12 @@ struct packet_info_t  // todo change this to union
 
     bool has_ts;
 
+    i32_t data_len;
+
 #ifdef UDP2RAW_LINUX
     sockaddr_ll addr_ll;
 #endif
 
-    i32_t data_len;
-
     packet_info_t();
 };