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# probe libc's inet_pton & backtrace it with ping
# Installs a probe on libc's inet_pton function, that will use uprobes,
# then use 'perf trace' on a ping to localhost asking for just one packet
# with the a backtrace 3 levels deep, check that it is what we expect.
# This needs no debuginfo package, all is done using the libc ELF symtab
# and the CFI info in the binaries.
# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
. $(dirname $0)/lib/probe.sh
libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g')
nm -g $libc 2>/dev/null | fgrep -q inet_pton || exit 254
trace_libc_inet_pton_backtrace() {
idx=0
expected[0]="PING.*bytes"
expected[1]="64 bytes from ::1.*"
expected[2]=".*ping statistics.*"
expected[3]=".*packets transmitted.*"
expected[4]="rtt min.*"
expected[5]="[0-9]+\.[0-9]+[[:space:]]+probe_libc:inet_pton:\([[:xdigit:]]+\)"
expected[6]=".*inet_pton[[:space:]]\($libc\)$"
expected[7]="getaddrinfo[[:space:]]\($libc\)$"
expected[8]=".*\(.*/bin/ping.*\)$"
perf trace --no-syscalls -e probe_libc:inet_pton/max-stack=3/ ping -6 -c 1 ::1 2>&1 | grep -v ^$ | while read line ; do
echo $line
echo "$line" | egrep -q "${expected[$idx]}"
if [ $? -ne 0 ] ; then
printf "FAIL: expected backtrace entry %d \"%s\" got \"%s\"\n" $idx "${expected[$idx]}" "$line"
exit 1
fi
let idx+=1
[ $idx -eq 9 ] && break
done
}
# Check for IPv6 interface existence
ip a sh lo | fgrep -q inet6 || exit 2
skip_if_no_perf_probe && \
perf probe -q $libc inet_pton && \
trace_libc_inet_pton_backtrace
err=$?
rm -f ${file}
perf probe -q -d probe_libc:inet_pton
exit $err
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