trondd noticed a startup problem with snmpd on mips64 but didn't see
them on amd64 and wondered if it was arch-specific, I had a go at
reproducing and see it very often on aarch64 and also sometimes on
amd64.
Any setting of "trap receiver $ip snmpv2c community $community"
triggers the problem:
# for i in `jot 20`; do snmpd -nvf /etc/snmpd.conf; done
trap receiver: missing community
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
trap receiver: missing community
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
configuration ok
trap receiver: missing community
Additionally even when configuration is accepted, the community is set
to junk
822 tr->ta_oid = $2;
823 tr->ta_version = $3.type;
with snmpv2c ta_version is set to 1
824 if ($3.type == ADDRESS_FLAG_SNMPV2) {
so this branch isn't taken
825 (void)strlcpy(tr->ta_community, $3.data,
826 sizeof(tr->ta_community));
827 free($3.data);
828 } else {
829 tr->ta_usmusername = $3.data;
830 tr->ta_seclevel = $3.value;
831 }
at this point ta_usmusername is set to the community and ta_community
is junk.
810 if ($4 != NULL) {
(gdb)
823 tr->ta_version = $3.type;
(gdb)
824 if ($3.type == ADDRESS_FLAG_SNMPV2) {
(gdb) p *tr
$3 = {ta_ss = {ss_len = 16 '\020', ss_family = 2 '\002', __ss_pad1 =
"\000\242\303_\273T", __ss_pad2 = 0,
__ss_pad3 = "\002\000\000\000\001\000\000\000\001\000\000\000\a", '\000'
<repeats 226 times>}, ta_sslocal = {
ss_len = 0 '\000', ss_family = 0 '\000', __ss_pad1 =
"\000\000\000\000\000", __ss_pad2 = 0,
__ss_pad3 = '\000' <repeats 239 times>}, ta_version = 1, {ta_community =
'\000' <repeats 483 times>, {
ta_usmusername = 0x0, ta_usmuser = 0x0, ta_seclevel = 0}}, ta_oid = 0x0,
entry = {tqe_next = 0x0,
tqe_prev = 0x0}}
(gdb) n
829 tr->ta_usmusername = $3.data;
(gdb)
830 tr->ta_seclevel = $3.value;
(gdb)
832 TAILQ_INSERT_TAIL(&(conf->sc_trapreceivers),
tr, entry);
(gdb) p *tr
$4 = {ta_ss = {ss_len = 16 '\020', ss_family = 2 '\002', __ss_pad1 =
"\000\242\303_\273T", __ss_pad2 = 0,
__ss_pad3 = "\002\000\000\000\001\000\000\000\001\000\000\000\a", '\000'
<repeats 226 times>}, ta_sslocal = {
ss_len = 0 '\000', ss_family = 0 '\000', __ss_pad1 =
"\000\000\000\000\000", __ss_pad2 = 0,
__ss_pad3 = '\000' <repeats 239 times>}, ta_version = 1, {
ta_community = "\340\035a\250O\005", '\000' <repeats 477 times>, {
ta_usmusername = 0x54fa8611de0 "zzzzzzzzzzzzzzzzzz", ta_usmuser = 0x0,
ta_seclevel = 0}}, ta_oid = 0x0,
entry = {tqe_next = 0x0, tqe_prev = 0x0}}
