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Re-think who_count management.

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Should fix hard to trigger bug: fatal("negative who_count").
This commit is contained in:
nohar 2007-01-05 21:19:32 +00:00
parent a7d21b2693
commit 5c17d27a95
3 changed files with 104 additions and 40 deletions
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137
src/irc.c
View File

@ -396,16 +396,44 @@ static int irc_315(struct link_server *server, struct line *l)
{
struct link *link = LINK(server);
if (link->who_client) {
if (link->who_client->who_count == 0) {
mylog(LOG_DEBUG, "Spurious irc_315");
return OK_COPY_WHO;
}
link->who_client->whoc_tstamp = time(NULL);
if (link->who_client->who_count > 0) {
--link->who_client->who_count;
if (link->who_client->who_count < 0)
fatal("negative who count");
mylog(LOG_INFO,
"RPL_ENDOFWHO: "
"Decrementing who count for %p: %d",
link->who_client, link->who_client->who_count);
}
}
l = NULL; /* keep gcc happy */
return OK_COPY_WHO;
}
void rotate_who_client(struct link *link)
{
int i;
mylog(LOG_INFO, "rotate_who_client %p", link->who_client);
/* find a client with non-null who_count */
link->who_client = NULL;
for (i = 0; i < link->l_clientc; i++) {
struct link_client *ic = link->l_clientv[i];
if (!list_is_empty(&ic->who_queue)) {
char *l;
while ((l = list_remove_first(&ic->who_queue))) {
write_line(CONN(link->l_server), l);
free(l);
}
link->who_client = ic;
break;
}
}
}
/*
* parses:join part mode kick kill privmsg quit nick names
* returns: -1 invalid protocol
@ -540,32 +568,12 @@ int irc_dispatch_server(struct link_server *server, struct line *line)
s = irc_line_to_string(line);
write_line(CONN(LINK(server)->who_client), s);
free(s);
if (LINK(server)->who_client->who_count == 0) {
int i;
for (i = 0; i < LINK(server)->l_clientc; i++) {
struct link_client *ic =
LINK(server)->l_clientv[i];
if (ic == LINK(server)->who_client) {
if (!list_is_empty(&ic->who_queue))
fatal("who active and queued?");
continue;
}
if (!list_is_empty(&ic->who_queue)) {
char *l;
while ((l = list_remove_first(
&ic->who_queue))) {
write_line(CONN(server), l);
free(l);
}
LINK(server)->who_client = ic;
break;
}
}
if (i == LINK(server)->l_clientc)
LINK(server)->who_client = NULL;
}
if (LINK(server)->who_client &&
LINK(server)->who_client->who_count == 0) {
mylog(LOG_INFO, "OK_COPY_WHO: who_count for %p is nul",
LINK(server)->who_client);
rotate_who_client(LINK(server));
}
return ret;
}
@ -649,8 +657,16 @@ void unbind_from_link(struct link_client *ic)
if (i == l->l_clientc)
fatal("unbind_from_link");
if (l->who_client == ic)
if (l->who_client == ic) {
mylog(LOG_INFO, "unbind_from_link: %p: %d",
l->who_client, ic->who_count);
l->who_client = NULL;
} else {
mylog(LOG_INFO,
"unbind_from_link: nothing to do %p != %p: %d",
ic, l->who_client,
ic->who_count);
}
for (i = i + 1; i < l->l_clientc; i++)
l->l_clientv[i - 1] = l->l_clientv[i];
@ -948,6 +964,12 @@ static int irc_cli_who(struct link_client *ic, struct line *line)
{
struct link *l = LINK(ic);
++ic->who_count;
if (ic->who_count == 1)
ic->whoc_tstamp = time(NULL);
mylog(LOG_INFO, "cli_who: Incrementing who count for %p: %d",
ic, ic->who_count);
if (l->who_client && l->who_client != ic) {
list_add_first(&ic->who_queue, irc_line_to_string(line));
return OK_FORGET;
@ -956,8 +978,6 @@ static int irc_cli_who(struct link_client *ic, struct line *line)
if (!l->who_client)
l->who_client = ic;
++ic->who_count;
return OK_COPY;
}
@ -973,6 +993,12 @@ static int irc_cli_mode(struct link_client *ic, struct line *line)
strchr(line->elemv[2], 'b') == NULL)
return OK_COPY;
++ic->who_count;
if (ic->who_count == 1)
ic->whoc_tstamp = time(NULL);
mylog(LOG_INFO, "cli_mode: Incrementing who count for %p: %d",
l->who_client, ic->who_count);
if (l->who_client && l->who_client != ic) {
list_add_first(&ic->who_queue, irc_line_to_string(line));
return OK_FORGET;
@ -981,8 +1007,6 @@ static int irc_cli_mode(struct link_client *ic, struct line *line)
if (!l->who_client)
l->who_client = ic;
++ic->who_count;
return OK_COPY;
}
@ -1486,10 +1510,19 @@ static int irc_368(struct link_server *server, struct line *l)
{
struct link *link = LINK(server);
if (link->who_client) {
--link->who_client->who_count;
if (link->who_client->who_count == 0) {
mylog(LOG_DEBUG, "Spurious irc_368");
return OK_COPY_WHO;
}
link->who_client->whoc_tstamp = time(NULL);
if (link->who_client->who_count < 0)
fatal("negative who count");
if (link->who_client->who_count > 0) {
--link->who_client->who_count;
mylog(LOG_INFO,
"RPL_ENDOFBANLIST: "
"Decrementing who count for %p: %d",
link->who_client, link->who_client->who_count);
}
}
l = NULL; /* keep gcc happy */
@ -2202,6 +2235,29 @@ void oidentd_dump(list_t *connl)
/* do not use */
list_t *_connections = NULL;
void timeout_clean_who_counts(list_t *conns)
{
list_iterator_t it;
for (list_it_init(conns, &it); list_it_item(&it); list_it_next(&it)) {
struct link *l = list_it_item(&it);
struct link_client *client = l->who_client;
if (client && client->whoc_tstamp) {
time_t now;
now = time(NULL);
if (now - client->whoc_tstamp > 10) {
mylog(LOG_DEBUG, "Yawn, "
"forgetting one who reply");
if (client->who_count > 0)
--client->who_count;
client->whoc_tstamp = time(NULL);
if (client->who_count == 0)
rotate_who_client(l);
}
}
}
}
struct link_client *reloading_client;
/*
* The main loop
@ -2268,8 +2324,10 @@ void irc_main(connection_t *inc, list_t *ll)
struct link *link;
connection_t *conn;
/* Compute timeouts for next reconnections and lagouts */
if (timeleft == 0) {
/*
* Compute timeouts for next reconnections and lagouts
*/
static int throttle_prot = S_CONN_DELAY - 1;
timeleft = 1000;
@ -2328,6 +2386,11 @@ void irc_main(connection_t *inc, list_t *ll)
list_it_remove(&li);
}
}
/*
* Cleanup lagging or dangling who_count buffers
*/
timeout_clean_who_counts(ll);
}
int nc;

1
src/irc.h
View File

@ -155,6 +155,7 @@ struct link_client {
list_t who_queue;
int who_count;
time_t whoc_tstamp;
#ifdef HAVE_LIBSSL
int allow_trust;

2
src/util.c
View File

@ -459,7 +459,7 @@ static unsigned char hash_func(char *pkey)
char c;
unsigned long hash = 5381; /* 5381 & 0xff makes more sense */
while (c = *pkey++)
while ((c = *pkey++))
hash = ((hash << 5) + hash) ^ c;
return (unsigned char)hash;
}