libpcap cross-compiling

This paper studies the use of libpcap to collect data packets on openwrt routers (based on ARM architecture).

 

1. Install the ARM cross-compilation environment

Download the openwrt source code and check Build OpenWrt Toolchain when compiling. For the compilation process, see: http://tcspecial.iteye.com/blog/2280873 

 

2. Download the source code

libpcap only has the same set of source code, supports embedded compilation, and does not have a separate embedded version.

wget http://www.tcpdump.org/release/libpcap-1.4.0.tar.gz
tar -xzvf libpcap-1.4.0.tar.gz
cd libpcap-1.4.0

 

3. Compile libpcap

3.1 Setting up the cross-compilation environment

Because libpcap is running on the router, it should be compiled with the arm-openwrt-linux-gcc tool.

#armenv.sh
Workdir=~/openwrt-arm
export STAGING_DIR=${Workdir}/bin
export PATH=${Workdir}/bin:$PATH
 
export CROSS_COMPILE=arm-openwrt-linux-
export CROSS_PREFIX=arm-openwrt-linux-
export CC=${CROSS_PREFIX}gcc
export STRIP=${CROSS_PREFIX}strip
export AR=${CROSS_PREFIX}ar
export RANLIB=${CROSS_PREFIX}ranlib
export OBJCOPY=${CROSS_PREFIX}objcopy

  

source ~/mipsenv.sh
./configure --prefix=/home/ubuntu/libpcap-arm --host=arm-openwrt-linux

    Note: MIPS platform, specify --host=mips-openwrt-linux

 

Error message:

configure: error: pcap type not determined when cross-compiling; use --with-pcap=...

 

Method 1: Add the --with-pcap parameter to specify the collection type

./configure --prefix=/home/ubuntu/libpcap-arm --host=arm-openwrt-linux --with-pcap=linux

  

Method 2: Comment the code

Line 7210

vi configure

#if test -z "$with_pcap" && test "$cross_compiling" = yes; then
#       { { echo "$as_me:$LINENO: error: pcap type not determined when cross-compiling; use --with-pcap=..." >&5
#echo "$as_me: error: pcap type not determined when cross-compiling; use --with-pcap=..." >&2;}
  { (exit 1); exit 1; }; }
#be

  

make && make install 

 

4. Test