Add glibc to OpenWrt

中文版

I’m trying to replace traceroute with a tool called BestTrace, but an error was raised during execution:

Failed to execute process ‘./besttrace’. Reason:
The file ‘./besttrace’ does not exist or could not be executed.

Error

Check the executable with file:

besttrace: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, Go BuildID=1c1dnBC1TKT-wnm6J_Ek/Csaj2Jrm0niZmmJ8paMZ/_hoguDO-XKYO0IWEnHWa/H2kGhpM-teit7NepUJE5, not stripped

Noticed that, interpreter /lib64/ld-linux-x86-64.so.2, which means the arch x86-64 is correct, but glibc runtime is missing.

Since 2015, for consideration of the space and speed of embedded devices, OpenWrt has swutched to musl from uClibc as C library.

Whereas nowadays most software are using glibc, which cannot be run on OpenWrt.

Solution

Just copy ld-linux-x86-64.so.2 here!

Docker

If Docker is installed:

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#!/usr/bin/env bash

set -ex

# working directory
# change to /opt, /usr/share or something else if you like
WK_DIR="/root/data"
mkdir -p $WK_DIR
cd $WK_DIR

# pull Ubuntu
docker pull ubuntu:jammy

# start a container
docker run -itd --name glibc ubuntu:jammy

# copy libs
docker cp -a glibc:/lib/x86_64-linux-gnu .

# link
ln -s "$WK_DIR/x86_64-linux-gnu"                      /lib/x86_64-linux-gnu     || echo "Link already exists."
ln -s "$WK_DIR/x86_64-linux-gnu/ld-linux-x86-64.so.2" /lib/ld-linux-x86-64.so.2 || echo "Link already exists."

# cleanup
docker stop glibc
docker rm   glibc
docker rmi  ubuntu:jammy

This means you can always get the latest libs, and switch to other distros you like.

Directly

Note: glibc v2.35, packed on 2022-10-03, could be outdated.

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#!/usr/bin/env bash

set -ex

# working directory
# change to /opt, /usr/share or something else if you like
WK_DIR="/root/data"
mkdir -p $WK_DIR
cd $WK_DIR

# download
wget "https://github.com/KumaTea/blog/releases/download/221003/glibc.tar.gz"

# decompress
tar -xzf glibc.tar.gz

# link
ln -s "$WK_DIR/x86_64-linux-gnu"                      /lib/x86_64-linux-gnu     || echo "Link already exists."
ln -s "$WK_DIR/x86_64-linux-gnu/ld-linux-x86-64.so.2" /lib/ld-linux-x86-64.so.2 || echo "Link already exists."

# cleanup
rm -f glibc.tar.gz

After these instructions the program can be run successfully.

Done