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BUG/MINOR: cfgparse/peers: fix inconsistent check for missing peer server

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In the "peers" section parser, right after parse_server() is called, we
used to check whether the curpeers->peers_fe->srv pointer was set or not
to know if parse_server() successfuly added a server to the peers proxy,
server that we can then associate to the new peer.

However the check is wrong, as curpeers->peers_fe->srv points to the
last added server, if a server was successfully added before the
failing one, we cannot detect that the last parse_server() didn't
add a server. This is known to cause bug with bad "peer"/"server"
statements.

To fix the issue, we save a pointer on the last known
curpeers->peers_fe->srv before parse_server() is called, and we then
compare the save with the pointer after parse_server(), if the value
didn't change, then parse_server() didn't add a server. This makes
the check consistent in all situations.

It should be backported to all stable versions.
This commit is contained in:
Aurelien DARRAGON 2025-03-06 09:05:23 +01:00
parent 29db5406b4
commit 2560ab892f
1 changed files with 6 additions and 2 deletions
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8
src/cfgparse.c
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@ -835,6 +835,7 @@ int cfg_parse_peers(const char *file, int linenum, char **args, int kwm)
}
else if (strcmp(args[0], "peer") == 0 ||
strcmp(args[0], "server") == 0) { /* peer or server definition */
struct server *prev_srv;
int local_peer, peer;
int parse_addr = 0;
@ -885,10 +886,13 @@ int cfg_parse_peers(const char *file, int linenum, char **args, int kwm)
* or if we are parsing a "server" line and the current peer is not the local one.
*/
parse_addr = (peer || !local_peer) ? SRV_PARSE_PARSE_ADDR : 0;
prev_srv = curpeers->peers_fe->srv;
err_code |= parse_server(file, linenum, args, curpeers->peers_fe, NULL,
SRV_PARSE_IN_PEER_SECTION|parse_addr|SRV_PARSE_INITIAL_RESOLVE);
if (!curpeers->peers_fe->srv) {
/* Remove the newly allocated peer. */
if (curpeers->peers_fe->srv == prev_srv) {
/* parse_server didn't add a server:
* Remove the newly allocated peer.
*/
if (newpeer != curpeers->local) {
struct peer *p;