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Avoid prioritising MODE queries for channels with hyphens in their name

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If a user has a large number of channels containing hyphens in their
names, the initial MODE queries will have the same high priority as any
PINGs, and so will block the PINGs from being sent, causing the
connection to time out due to a lack of PONGs received.
This commit is contained in:
James Clarke 2020-01-01 20:37:39 +00:00 committed by Patrick
parent c361bdca6a
commit 9c44d7baf4
1 changed files with 28 additions and 6 deletions
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34
src/common/server.c
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@ -200,13 +200,35 @@ tcp_send_len (server *serv, char *buf, int len)
}
else
{
/* WHO/MODE get the lowest priority */
if (g_ascii_strncasecmp (dbuf + 1, "WHO ", 4) == 0 ||
/* but only MODE queries, not changes */
(g_ascii_strncasecmp (dbuf + 1, "MODE", 4) == 0 &&
strchr (dbuf, '-') == NULL &&
strchr (dbuf, '+') == NULL))
/* WHO gets the lowest priority */
if (g_ascii_strncasecmp (dbuf + 1, "WHO ", 4) == 0)
dbuf[0] = 0;
/* as do MODE queries (but not changes) */
else if (g_ascii_strncasecmp (dbuf + 1, "MODE ", 5) == 0)
{
char *mode_str, *mode_str_end, *loc;
/* skip spaces before channel/nickname */
for (mode_str = dbuf + 5; *mode_str == ' '; ++mode_str);
/* skip over channel/nickname */
mode_str = strchr (mode_str, ' ');
if (mode_str)
{
/* skip spaces before mode string */
for (; *mode_str == ' '; ++mode_str);
/* find spaces after end of mode string */
mode_str_end = strchr (mode_str, ' ');
/* look for +/- within the mode string */
loc = strchr (mode_str, '-');
if (loc && (!mode_str_end || loc < mode_str_end))
goto keep_priority;
loc = strchr (mode_str, '+');
if (loc && (!mode_str_end || loc < mode_str_end))
goto keep_priority;
}
dbuf[0] = 0;
keep_priority:
;
}
}
serv->outbound_queue = g_slist_append (serv->outbound_queue, dbuf);