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ebpf instructions updated

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Gustavo Iñiguez Goia 2022-11-18 21:50:42 +01:00
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20
ebpf_prog/README
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@ -1,4 +1,9 @@
opensnitch.c is an eBPF program. Compilation requires getting kernel source.
Compilation requires getting kernel sources.
There's a helper script to automate this process:
https://github.com/evilsocket/opensnitch/blob/master/utils/packaging/build_modules.sh
The basic steps to compile the modules are:
sudo apt install clang llvm libelf-dev libzip-dev flex bison libssl-dev bc rsync python3
cd opensnitch
@ -13,8 +18,12 @@ llvm-strip -g opensnitch.o #remove debug info
sudo cp opensnitch*.o /etc/opensnitchd/
cd ../../../daemon
--opensnitchd expects to find opensnitch.o in /etc/opensnitchd/
--start opensnitchd with:
opensnitchd expects to find opensnitch.o in:
/usr/local/lib/opensnitchd/ebpf/
/usr/lib/opensnitchd/ebpf/
/etc/opensnitchd/ # deprecated
start opensnitchd with:
opensnitchd -rules-path /etc/opensnitchd/rules -process-monitor-method ebpf
@ -28,6 +37,11 @@ CONFIG_BPF_EVENTS=y
CONFIG_KPROBES=y
CONFIG_KPROBE_EVENTS=y
For the opensnitch-procs.o module to work, this option must be enabled:
$ grep FTRACE_SYSCALLS /boot/config-$(uname -r)
CONFIG_FTRACE_SYSCALLS=y
Also, in some distributions debugfs is not mounted automatically, so you need
to do it manually: