Add UDP syscall monitor with eBPF in Rust and Go integration #8
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- Implemented eBPF kprobe `udp_monitor` in Rust using aya
- Attached to `__x64_sys_sendto` and `__x64_sys_sendmsg` syscalls
- Counted UDP send attempts per process (PID)
- Used a fallback key `{ pid, dst_ip = 0 }` to ensure stable operation without pointer dereferencing
- Integrated with Go using cilium/ebpf for loading, attaching, and map polling
- Validated functionality with C-based sendto test client and netcat
- Final structure supports extendable map output and clean userland signal handling
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udp_monitorin Rust using aya__x64_sys_sendtoand__x64_sys_sendmsgsyscalls{ pid, dst_ip = 0 }to ensure stable operation without pointer dereferencing