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Merge of r4654, r4672, r4684, r4685, r4692: resolver changes.

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*) Resolver: fixed format specification.
   Patch by Yichun Zhang (agentzh).

*) Support for IPv6 literals and an optional port in resolver.

*) Fixed crash in ngx_resolver_cleanup_tree().

   If sending a DNS request fails with an error (e.g., when mistakenly
   trying to send it to a local IP broadcast), such a request is not
   deleted if there are clients waiting on it.  However, it was still
   erroneously removed from the queue.  Later ngx_resolver_cleanup_tree()
   attempted to remove it from the queue again that resulted in a NULL
   pointer dereference.

*) When "resolver" is configured with a domain name, only the first
   resolved address was used.  Now all addresses will be used.

*) Fixed segfault with poll and resolver used.

   Poll event method needs ngx_cycle->files to work, and use of
   ngx_exit_cycle without files set caused null pointer dereference in
   resolver's cleanup on udp socket close.
This commit is contained in:
Maxim Dounin 2012-07-02 16:23:14 +00:00
parent cd8c055e4a
commit bb612f1336
2 changed files with 21 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/core/ngx_resolver.c
View File

@ -96,7 +96,7 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
{
ngx_str_t s;
ngx_url_t u;
ngx_uint_t i;
ngx_uint_t i, j;
ngx_resolver_t *r;
ngx_pool_cleanup_t *cln;
ngx_udp_connection_t *uc;
@ -171,29 +171,31 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
ngx_memzero(&u, sizeof(ngx_url_t));
u.host = names[i];
u.port = 53;
u.url = names[i];
u.default_port = 53;
if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) {
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in resolver \"%V\"",
u.err, &u.host);
u.err, &u.url);
}
return NULL;
}
uc = ngx_array_push(&r->udp_connections);
uc = ngx_array_push_n(&r->udp_connections, u.naddrs);
if (uc == NULL) {
return NULL;
}
ngx_memzero(uc, sizeof(ngx_udp_connection_t));
ngx_memzero(uc, u.naddrs * sizeof(ngx_udp_connection_t));
uc->sockaddr = u.addrs->sockaddr;
uc->socklen = u.addrs->socklen;
uc->server = u.addrs->name;
for (j = 0; j < u.naddrs; j++) {
uc[j].sockaddr = u.addrs[j].sockaddr;
uc[j].socklen = u.addrs[j].socklen;
uc[j].server = u.addrs[j].name;
}
}
return r;
@ -977,12 +979,11 @@ ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue)
if (rn->waiting) {
if (ngx_resolver_send_query(r, rn) == NGX_OK) {
(void) ngx_resolver_send_query(r, rn);
rn->expire = now + r->resend_timeout;
ngx_queue_insert_head(queue, &rn->queue);
}
ngx_queue_insert_head(queue, q);
continue;
}
@ -1040,7 +1041,7 @@ ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n)
nan = (query->nan_hi << 8) + query->nan_lo;
ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui",
"resolver DNS response %ui fl:%04Xui %ui/%ui/%ud/%ud",
ident, flags, nqs, nan,
(query->nns_hi << 8) + query->nns_lo,
(query->nar_hi << 8) + query->nar_lo);
@ -2189,7 +2190,7 @@ ngx_udp_connect(ngx_udp_connection_t *uc)
ngx_socket_t s;
ngx_connection_t *c;
s = ngx_socket(AF_INET, SOCK_DGRAM, 0);
s = ngx_socket(uc->sockaddr->sa_family, SOCK_DGRAM, 0);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s);

4
src/os/unix/ngx_process_cycle.c
View File

@ -711,6 +711,8 @@ ngx_master_process_exit(ngx_cycle_t *cycle)
ngx_exit_log.file = &ngx_exit_log_file;
ngx_exit_cycle.log = &ngx_exit_log;
ngx_exit_cycle.files = ngx_cycle->files;
ngx_exit_cycle.files_n = ngx_cycle->files_n;
ngx_cycle = &ngx_exit_cycle;
ngx_destroy_pool(cycle->pool);
@ -1054,6 +1056,8 @@ ngx_worker_process_exit(ngx_cycle_t *cycle)
ngx_exit_log.file = &ngx_exit_log_file;
ngx_exit_cycle.log = &ngx_exit_log;
ngx_exit_cycle.files = ngx_cycle->files;
ngx_exit_cycle.files_n = ngx_cycle->files_n;
ngx_cycle = &ngx_exit_cycle;
ngx_destroy_pool(cycle->pool);