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Khem Raj
4ec8afbfcf
- ctypes.util.find_library() relies on "ldconfig -p", gcc or ld, none of
which exist on a musl target, so find_library("pcap") returns None
and scapy raises "Cannot find libpcap.so library" even with libpcap
installed. That disabled conf.use_pcap and BPF filter compilation and
failed ten ptests (offline sniff() with filters, tcpdump(), tdecode(),
traceroute). Fall back to loading libpcap.so.1/libpcap.so by name.
- The NetBSD read_routes6() test compares IPv4-compatible IPv6 prefixes
as strings, but musl's inet_ntop() prints ::127.0.0.0 as ::7f00:0.
Normalise the expected values with in6_ptop().
Tested with meta-networking-image-ptest-python3-scapy on qemux86-64
with yoe-musl-systemd-wayland: TOTAL: 1 FAIL: 0.
AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
53 lines
1.9 KiB
Diff
53 lines
1.9 KiB
Diff
From 6ee4ddc1b53f792d4e2a7826d65cebeeb9d9eb79 Mon Sep 17 00:00:00 2001
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From: Khem Raj <khem.raj@oss.qualcomm.com>
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Date: Sun, 27 Sep 2026 15:54:57 -0700
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Subject: [PATCH 3/4] libpcap: load libpcap even when find_library() cannot
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locate it
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ctypes.util.find_library() finds libraries through "ldconfig -p", gcc
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or ld. A target system may have none of them; on musl-based systems
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there is no ldconfig cache at all, so find_library("pcap") returns None
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even with libpcap installed, and scapy reports
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OSError: Cannot find libpcap.so library
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which disables conf.use_pcap and BPF filter compilation (sniff() with a
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filter, tcpdump(), tdecode(), ...). Fall back to loading libpcap.so.1 or
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libpcap.so by name and let the dynamic loader search its default paths.
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Upstream-Status: Pending
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Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
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---
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scapy/libs/winpcapy.py | 18 +++++++++++++++---
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1 file changed, 15 insertions(+), 3 deletions(-)
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diff --git a/scapy/libs/winpcapy.py b/scapy/libs/winpcapy.py
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index 42bfa850..c537b22b 100644
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--- a/scapy/libs/winpcapy.py
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+++ b/scapy/libs/winpcapy.py
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@@ -36,9 +36,21 @@ else:
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# Try to load libpcap
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SOCKET = c_int
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_lib_name = find_library("pcap")
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- if not _lib_name:
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- raise OSError("Cannot find libpcap.so library")
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- _lib = CDLL(_lib_name)
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+ if _lib_name:
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+ _lib = CDLL(_lib_name)
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+ else:
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+ # ctypes.util.find_library() relies on ldconfig, gcc or ld to
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+ # locate libraries, none of which may exist on the target (e.g.
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+ # musl-based systems have no "ldconfig -p"). Fall back to letting
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+ # the dynamic loader search its default paths.
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+ for _lib_name in ("libpcap.so.1", "libpcap.so"):
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+ try:
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+ _lib = CDLL(_lib_name)
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+ break
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+ except OSError:
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+ pass
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+ else:
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+ raise OSError("Cannot find libpcap.so library")
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##
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