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From b9560cc74c99e96f97490608b292f23735252aaf Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jan=20Pokorn=C3=BD?= <jpokorny@redhat.com>
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Date: Wed, 14 Sep 2016 22:31:56 +0200
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Subject: [PATCH] High: zealous local address matching with the same subnet
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entries
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Previously, having booth components on the same subnet could seriously
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confuse self-determination of those tolerating fuzziness when doing so
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(i.e., not site nor arbitrator).
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It would be the case when there are two (or more) addresses sharing the
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same network part of the address as one of the actual hosts's addresses
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(assigned to one of its interfaces), and the exactly matching one is
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listed _after_ at least a single network-part-match-only one ("fuzzy"
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match). Due to the original requirement that any subsequent candidate
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would have to beat a running winner in the length of the network prefix,
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such exact match could never have been tested and hence missed.
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(IOW, algorithm used to search for local, not global maximum in some
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circumstances).
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Now we allow further examination of the candidate with the same length
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of the network prefix as a running winner, which -- moreover -- cannot
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be the exact match because now, it terminates the search immediately.
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---
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src/transport.c | 22 ++++++++++++++--------
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1 file changed, 14 insertions(+), 8 deletions(-)
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diff --git a/src/transport.c b/src/transport.c
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index b3e4432..1d620a0 100644
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--- a/src/transport.c
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+++ b/src/transport.c
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@@ -237,15 +237,21 @@ int _find_myself(int family, struct booth_site **mep, int fuzzy_allowed)
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BOOTH_IPADDR_LEN);
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}
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- /* First try with exact addresses, then optionally with subnet matching. */
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- if (ifa->ifa_prefixlen > address_bits_matched) {
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- find_address(ipaddr,
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- ifa->ifa_family, ifa->ifa_prefixlen,
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- fuzzy_allowed, &me, &address_bits_matched);
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- if (me) {
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- log_debug("found myself at %s (%d bits matched)",
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- site_string(me), address_bits_matched);
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+ if (ifa->ifa_prefixlen >= address_bits_matched) {
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+ /* First attempt exact match with addresses in the config,
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+ then optionally with subnet matching. */
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+ if (find_address(ipaddr,
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+ ifa->ifa_family, ifa->ifa_prefixlen,
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+ fuzzy_allowed, &me, &address_bits_matched)
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+ == EXACT_MATCH) {
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+ log_debug("found exactly myself at %s (%d bits matched)",
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+ site_string(me), address_bits_matched);
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+ break;
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}
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+ if (me)
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+ log_debug("running winner to determine myself at %s"
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+ " (%d bits matched)",
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+ site_string(me), address_bits_matched);
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}
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}
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h = NLMSG_NEXT(h, status);
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--
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2.4.11
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