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Hello,
As a follow-up to https://github.com/the-tcpdump-group/tcpdump/issues/919, here
is a way to help finding eventual inconsistent outputs.
1) Get libpcap and tcpdump from the-tcpdump-group:master branches in the same
directory.
git clone https://github.com/the-tcpdump-group/libpcap.git
git clone https://github.com/the-tcpdump-group/tcpdump.git
2) Build libpcap (./configure && make -s clean all).
3) Build tcpdump with clang (CC=clang ./configure && make -s clean all). Rename
tcpdump to tcpdump_clang.
4) Build tcpdump with gcc (CC=gcc ./configure && make -s clean all). Rename
tcpdump to tcpdump_gcc.
5) Run the following script on all the pcap(ng) files you have access.
(Update PCAP_DIRS...)
6) Report any output giving the OS, clang and gcc versions.
Notes:
a) The script may need some update (TMPDIR for some systems).
b) It also could be updated to use compilers different from clang/gcc...
------------------------------------------------------------------------------------
#!/bin/bash
PCAP_DIRS='dir1 dir2 ...'
TMPDIR=/dev/shm/diff_2_compilers_$$
mkdir -p $TMPDIR
TCPDUMP_1=tcpdump_clang
TCPDUMP_2=tcpdump_gcc
while read -r p; do
rm -f $TMPDIR/*
file -b "$p" | grep capture >/dev/null || continue
./$TCPDUMP_1 -#Henvvvvvvvvvvvv -r "$p" >$TMPDIR/out1 2>$TMPDIR/err1
./$TCPDUMP_2 -#Henvvvvvvvvvvvv -r "$p" >$TMPDIR/out2 2>$TMPDIR/err2
cmp $TMPDIR/out1 $TMPDIR/out2 >/dev/null
[ $? = 1 ] && echo "$p" && diff $TMPDIR/out1 $TMPDIR/out2 && echo
sed -i "s/$TCPDUMP_1/$TCPDUMP_2/" $TMPDIR/err1
cmp $TMPDIR/err1 $TMPDIR/err2 >/dev/null
[ $? = 1 ] && echo "$p" && diff $TMPDIR/err1 $TMPDIR/err2 && echo
done < <(find $PCAP_DIRS -type f -not -path '*/\.git/*' -not -path
'*/\.svn/*'|sort)
------------------------------------------------------------------------------------
Greetings,
--
Francois-Xavier
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