diff options
Diffstat (limited to 'app/nginx/src/core/ngx_resolver.c')
| -rw-r--r-- | app/nginx/src/core/ngx_resolver.c | 4662 |
1 files changed, 0 insertions, 4662 deletions
diff --git a/app/nginx/src/core/ngx_resolver.c b/app/nginx/src/core/ngx_resolver.c deleted file mode 100644 index e140ab6..0000000 --- a/app/nginx/src/core/ngx_resolver.c +++ /dev/null @@ -1,4662 +0,0 @@ - -/* - * Copyright (C) Igor Sysoev - * Copyright (C) Nginx, Inc. - */ - - -#include <ngx_config.h> -#include <ngx_core.h> -#include <ngx_event.h> - - -#define NGX_RESOLVER_UDP_SIZE 4096 - -#define NGX_RESOLVER_TCP_RSIZE (2 + 65535) -#define NGX_RESOLVER_TCP_WSIZE 8192 - - -typedef struct { - u_char ident_hi; - u_char ident_lo; - u_char flags_hi; - u_char flags_lo; - u_char nqs_hi; - u_char nqs_lo; - u_char nan_hi; - u_char nan_lo; - u_char nns_hi; - u_char nns_lo; - u_char nar_hi; - u_char nar_lo; -} ngx_resolver_hdr_t; - - -typedef struct { - u_char type_hi; - u_char type_lo; - u_char class_hi; - u_char class_lo; -} ngx_resolver_qs_t; - - -typedef struct { - u_char type_hi; - u_char type_lo; - u_char class_hi; - u_char class_lo; - u_char ttl[4]; - u_char len_hi; - u_char len_lo; -} ngx_resolver_an_t; - - -#define ngx_resolver_node(n) \ - (ngx_resolver_node_t *) \ - ((u_char *) (n) - offsetof(ngx_resolver_node_t, node)) - - -static ngx_int_t ngx_udp_connect(ngx_resolver_connection_t *rec); -static ngx_int_t ngx_tcp_connect(ngx_resolver_connection_t *rec); - - -static void ngx_resolver_cleanup(void *data); -static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); -static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, - ngx_resolver_ctx_t *ctx, ngx_str_t *name); -static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, - ngx_queue_t *queue); -static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, - ngx_resolver_node_t *rn); -static ngx_int_t ngx_resolver_send_udp_query(ngx_resolver_t *r, - ngx_resolver_connection_t *rec, u_char *query, u_short qlen); -static ngx_int_t ngx_resolver_send_tcp_query(ngx_resolver_t *r, - ngx_resolver_connection_t *rec, u_char *query, u_short qlen); -static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_t *r, - ngx_resolver_node_t *rn, ngx_str_t *name); -static ngx_int_t ngx_resolver_create_srv_query(ngx_resolver_t *r, - ngx_resolver_node_t *rn, ngx_str_t *name); -static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_t *r, - ngx_resolver_node_t *rn, ngx_resolver_addr_t *addr); -static void ngx_resolver_resend_handler(ngx_event_t *ev); -static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, - ngx_queue_t *queue); -static ngx_uint_t ngx_resolver_resend_empty(ngx_resolver_t *r); -static void ngx_resolver_udp_read(ngx_event_t *rev); -static void ngx_resolver_tcp_write(ngx_event_t *wev); -static void ngx_resolver_tcp_read(ngx_event_t *rev); -static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, - size_t n, ngx_uint_t tcp); -static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, - ngx_uint_t ident, ngx_uint_t code, ngx_uint_t qtype, - ngx_uint_t nan, ngx_uint_t trunc, ngx_uint_t ans); -static void ngx_resolver_process_srv(ngx_resolver_t *r, u_char *buf, size_t n, - ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, - ngx_uint_t trunc, ngx_uint_t ans); -static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, - ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); -static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, - ngx_str_t *name, uint32_t hash); -static ngx_resolver_node_t *ngx_resolver_lookup_srv(ngx_resolver_t *r, - ngx_str_t *name, uint32_t hash); -static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, - in_addr_t addr); -static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, - ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); -static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, - u_char *buf, u_char *src, u_char *last); -static void ngx_resolver_timeout_handler(ngx_event_t *ev); -static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); -static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); -static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); -static void ngx_resolver_free(ngx_resolver_t *r, void *p); -static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); -static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); -static ngx_resolver_addr_t *ngx_resolver_export(ngx_resolver_t *r, - ngx_resolver_node_t *rn, ngx_uint_t rotate); -static void ngx_resolver_report_srv(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx); -static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); -static void ngx_resolver_resolve_srv_names(ngx_resolver_ctx_t *ctx, - ngx_resolver_node_t *rn); -static void ngx_resolver_srv_names_handler(ngx_resolver_ctx_t *ctx); -static ngx_int_t ngx_resolver_cmp_srvs(const void *one, const void *two); - -#if (NGX_HAVE_INET6) -static void ngx_resolver_rbtree_insert_addr6_value(ngx_rbtree_node_t *temp, - ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); -static ngx_resolver_node_t *ngx_resolver_lookup_addr6(ngx_resolver_t *r, - struct in6_addr *addr, uint32_t hash); -#endif - - -ngx_resolver_t * -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, j; - ngx_resolver_t *r; - ngx_pool_cleanup_t *cln; - ngx_resolver_connection_t *rec; - - cln = ngx_pool_cleanup_add(cf->pool, 0); - if (cln == NULL) { - return NULL; - } - - cln->handler = ngx_resolver_cleanup; - - r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); - if (r == NULL) { - return NULL; - } - - cln->data = r; - - r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); - if (r->event == NULL) { - return NULL; - } - - ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, - ngx_resolver_rbtree_insert_value); - - ngx_rbtree_init(&r->srv_rbtree, &r->srv_sentinel, - ngx_resolver_rbtree_insert_value); - - ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, - ngx_rbtree_insert_value); - - ngx_queue_init(&r->name_resend_queue); - ngx_queue_init(&r->srv_resend_queue); - ngx_queue_init(&r->addr_resend_queue); - - ngx_queue_init(&r->name_expire_queue); - ngx_queue_init(&r->srv_expire_queue); - ngx_queue_init(&r->addr_expire_queue); - -#if (NGX_HAVE_INET6) - r->ipv6 = 1; - - ngx_rbtree_init(&r->addr6_rbtree, &r->addr6_sentinel, - ngx_resolver_rbtree_insert_addr6_value); - - ngx_queue_init(&r->addr6_resend_queue); - - ngx_queue_init(&r->addr6_expire_queue); -#endif - - r->event->handler = ngx_resolver_resend_handler; - r->event->data = r; - r->event->log = &cf->cycle->new_log; - r->ident = -1; - - r->resend_timeout = 5; - r->tcp_timeout = 5; - r->expire = 30; - r->valid = 0; - - r->log = &cf->cycle->new_log; - r->log_level = NGX_LOG_ERR; - - if (n) { - if (ngx_array_init(&r->connections, cf->pool, n, - sizeof(ngx_resolver_connection_t)) - != NGX_OK) - { - return NULL; - } - } - - for (i = 0; i < n; i++) { - if (ngx_strncmp(names[i].data, "valid=", 6) == 0) { - s.len = names[i].len - 6; - s.data = names[i].data + 6; - - r->valid = ngx_parse_time(&s, 1); - - if (r->valid == (time_t) NGX_ERROR) { - ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, - "invalid parameter: %V", &names[i]); - return NULL; - } - - continue; - } - -#if (NGX_HAVE_INET6) - if (ngx_strncmp(names[i].data, "ipv6=", 5) == 0) { - - if (ngx_strcmp(&names[i].data[5], "on") == 0) { - r->ipv6 = 1; - - } else if (ngx_strcmp(&names[i].data[5], "off") == 0) { - r->ipv6 = 0; - - } else { - ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, - "invalid parameter: %V", &names[i]); - return NULL; - } - - continue; - } -#endif - - ngx_memzero(&u, sizeof(ngx_url_t)); - - u.url = names[i]; - u.default_port = 53; - - 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.url); - } - - return NULL; - } - - rec = ngx_array_push_n(&r->connections, u.naddrs); - if (rec == NULL) { - return NULL; - } - - ngx_memzero(rec, u.naddrs * sizeof(ngx_resolver_connection_t)); - - for (j = 0; j < u.naddrs; j++) { - rec[j].sockaddr = u.addrs[j].sockaddr; - rec[j].socklen = u.addrs[j].socklen; - rec[j].server = u.addrs[j].name; - rec[j].resolver = r; - } - } - - return r; -} - - -static void -ngx_resolver_cleanup(void *data) -{ - ngx_resolver_t *r = data; - - ngx_uint_t i; - ngx_resolver_connection_t *rec; - - if (r) { - ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, - "cleanup resolver"); - - ngx_resolver_cleanup_tree(r, &r->name_rbtree); - - ngx_resolver_cleanup_tree(r, &r->srv_rbtree); - - ngx_resolver_cleanup_tree(r, &r->addr_rbtree); - -#if (NGX_HAVE_INET6) - ngx_resolver_cleanup_tree(r, &r->addr6_rbtree); -#endif - - if (r->event) { - if (r->event->timer_set) { - ngx_del_timer(r->event); - } - - ngx_free(r->event); - } - - - rec = r->connections.elts; - - for (i = 0; i < r->connections.nelts; i++) { - if (rec[i].udp) { - ngx_close_connection(rec[i].udp); - } - - if (rec[i].tcp) { - ngx_close_connection(rec[i].tcp); - } - - if (rec[i].read_buf) { - ngx_resolver_free(r, rec[i].read_buf->start); - ngx_resolver_free(r, rec[i].read_buf); - } - - if (rec[i].write_buf) { - ngx_resolver_free(r, rec[i].write_buf->start); - ngx_resolver_free(r, rec[i].write_buf); - } - } - - ngx_free(r); - } -} - - -static void -ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) -{ - ngx_resolver_ctx_t *ctx, *next; - ngx_resolver_node_t *rn; - - while (tree->root != tree->sentinel) { - - rn = ngx_resolver_node(ngx_rbtree_min(tree->root, tree->sentinel)); - - ngx_queue_remove(&rn->queue); - - for (ctx = rn->waiting; ctx; ctx = next) { - next = ctx->next; - - if (ctx->event) { - if (ctx->event->timer_set) { - ngx_del_timer(ctx->event); - } - - ngx_resolver_free(r, ctx->event); - } - - ngx_resolver_free(r, ctx); - } - - ngx_rbtree_delete(tree, &rn->node); - - ngx_resolver_free_node(r, rn); - } -} - - -ngx_resolver_ctx_t * -ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) -{ - in_addr_t addr; - ngx_resolver_ctx_t *ctx; - - if (temp) { - addr = ngx_inet_addr(temp->name.data, temp->name.len); - - if (addr != INADDR_NONE) { - temp->resolver = r; - temp->state = NGX_OK; - temp->naddrs = 1; - temp->addrs = &temp->addr; - temp->addr.sockaddr = (struct sockaddr *) &temp->sin; - temp->addr.socklen = sizeof(struct sockaddr_in); - ngx_memzero(&temp->sin, sizeof(struct sockaddr_in)); - temp->sin.sin_family = AF_INET; - temp->sin.sin_addr.s_addr = addr; - temp->quick = 1; - - return temp; - } - } - - if (r->connections.nelts == 0) { - return NGX_NO_RESOLVER; - } - - ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); - - if (ctx) { - ctx->resolver = r; - } - - return ctx; -} - - -ngx_int_t -ngx_resolve_name(ngx_resolver_ctx_t *ctx) -{ - size_t slen; - ngx_int_t rc; - ngx_str_t name; - ngx_resolver_t *r; - - r = ctx->resolver; - - if (ctx->name.len > 0 && ctx->name.data[ctx->name.len - 1] == '.') { - ctx->name.len--; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolve: \"%V\"", &ctx->name); - - if (ctx->quick) { - ctx->handler(ctx); - return NGX_OK; - } - - if (ctx->service.len) { - slen = ctx->service.len; - - if (ngx_strlchr(ctx->service.data, - ctx->service.data + ctx->service.len, '.') - == NULL) - { - slen += sizeof("_._tcp") - 1; - } - - name.len = slen + 1 + ctx->name.len; - - name.data = ngx_resolver_alloc(r, name.len); - if (name.data == NULL) { - return NGX_ERROR; - } - - if (slen == ctx->service.len) { - ngx_sprintf(name.data, "%V.%V", &ctx->service, &ctx->name); - - } else { - ngx_sprintf(name.data, "_%V._tcp.%V", &ctx->service, &ctx->name); - } - - /* lock name mutex */ - - rc = ngx_resolve_name_locked(r, ctx, &name); - - ngx_resolver_free(r, name.data); - - } else { - /* lock name mutex */ - - rc = ngx_resolve_name_locked(r, ctx, &ctx->name); - } - - if (rc == NGX_OK) { - return NGX_OK; - } - - /* unlock name mutex */ - - if (rc == NGX_AGAIN) { - return NGX_OK; - } - - /* NGX_ERROR */ - - if (ctx->event) { - ngx_resolver_free(r, ctx->event); - } - - ngx_resolver_free(r, ctx); - - return NGX_ERROR; -} - - -void -ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) -{ - ngx_uint_t i; - ngx_resolver_t *r; - ngx_resolver_ctx_t *w, **p; - ngx_resolver_node_t *rn; - - r = ctx->resolver; - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolve name done: %i", ctx->state); - - if (ctx->quick) { - return; - } - - if (ctx->event && ctx->event->timer_set) { - ngx_del_timer(ctx->event); - } - - /* lock name mutex */ - - if (ctx->nsrvs) { - for (i = 0; i < ctx->nsrvs; i++) { - if (ctx->srvs[i].ctx) { - ngx_resolve_name_done(ctx->srvs[i].ctx); - } - - if (ctx->srvs[i].addrs) { - ngx_resolver_free(r, ctx->srvs[i].addrs->sockaddr); - ngx_resolver_free(r, ctx->srvs[i].addrs); - } - - ngx_resolver_free(r, ctx->srvs[i].name.data); - } - - ngx_resolver_free(r, ctx->srvs); - } - - if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { - - rn = ctx->node; - - if (rn) { - p = &rn->waiting; - w = rn->waiting; - - while (w) { - if (w == ctx) { - *p = w->next; - - goto done; - } - - p = &w->next; - w = w->next; - } - - ngx_log_error(NGX_LOG_ALERT, r->log, 0, - "could not cancel %V resolving", &ctx->name); - } - } - -done: - - if (ctx->service.len) { - ngx_resolver_expire(r, &r->srv_rbtree, &r->srv_expire_queue); - - } else { - ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); - } - - /* unlock name mutex */ - - /* lock alloc mutex */ - - if (ctx->event) { - ngx_resolver_free_locked(r, ctx->event); - } - - ngx_resolver_free_locked(r, ctx); - - /* unlock alloc mutex */ - - if (r->event->timer_set && ngx_resolver_resend_empty(r)) { - ngx_del_timer(r->event); - } -} - - -static ngx_int_t -ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx, - ngx_str_t *name) -{ - uint32_t hash; - ngx_int_t rc; - ngx_str_t cname; - ngx_uint_t i, naddrs; - ngx_queue_t *resend_queue, *expire_queue; - ngx_rbtree_t *tree; - ngx_resolver_ctx_t *next, *last; - ngx_resolver_addr_t *addrs; - ngx_resolver_node_t *rn; - - ngx_strlow(name->data, name->data, name->len); - - hash = ngx_crc32_short(name->data, name->len); - - if (ctx->service.len) { - rn = ngx_resolver_lookup_srv(r, name, hash); - - tree = &r->srv_rbtree; - resend_queue = &r->srv_resend_queue; - expire_queue = &r->srv_expire_queue; - - } else { - rn = ngx_resolver_lookup_name(r, name, hash); - - tree = &r->name_rbtree; - resend_queue = &r->name_resend_queue; - expire_queue = &r->name_expire_queue; - } - - if (rn) { - - /* ctx can be a list after NGX_RESOLVE_CNAME */ - for (last = ctx; last->next; last = last->next); - - if (rn->valid >= ngx_time()) { - - ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); - - ngx_queue_remove(&rn->queue); - - rn->expire = ngx_time() + r->expire; - - ngx_queue_insert_head(expire_queue, &rn->queue); - - naddrs = (rn->naddrs == (u_short) -1) ? 0 : rn->naddrs; -#if (NGX_HAVE_INET6) - naddrs += (rn->naddrs6 == (u_short) -1) ? 0 : rn->naddrs6; -#endif - - if (naddrs) { - - if (naddrs == 1 && rn->naddrs == 1) { - addrs = NULL; - - } else { - addrs = ngx_resolver_export(r, rn, 1); - if (addrs == NULL) { - return NGX_ERROR; - } - } - - last->next = rn->waiting; - rn->waiting = NULL; - - /* unlock name mutex */ - - do { - ctx->state = NGX_OK; - ctx->valid = rn->valid; - ctx->naddrs = naddrs; - - if (addrs == NULL) { - ctx->addrs = &ctx->addr; - ctx->addr.sockaddr = (struct sockaddr *) &ctx->sin; - ctx->addr.socklen = sizeof(struct sockaddr_in); - ngx_memzero(&ctx->sin, sizeof(struct sockaddr_in)); - ctx->sin.sin_family = AF_INET; - ctx->sin.sin_addr.s_addr = rn->u.addr; - - } else { - ctx->addrs = addrs; - } - - next = ctx->next; - - ctx->handler(ctx); - - ctx = next; - } while (ctx); - - if (addrs != NULL) { - ngx_resolver_free(r, addrs->sockaddr); - ngx_resolver_free(r, addrs); - } - - return NGX_OK; - } - - if (rn->nsrvs) { - last->next = rn->waiting; - rn->waiting = NULL; - - /* unlock name mutex */ - - do { - next = ctx->next; - - ngx_resolver_resolve_srv_names(ctx, rn); - - ctx = next; - } while (ctx); - - return NGX_OK; - } - - /* NGX_RESOLVE_CNAME */ - - if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { - - cname.len = rn->cnlen; - cname.data = rn->u.cname; - - return ngx_resolve_name_locked(r, ctx, &cname); - } - - last->next = rn->waiting; - rn->waiting = NULL; - - /* unlock name mutex */ - - do { - ctx->state = NGX_RESOLVE_NXDOMAIN; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - next = ctx->next; - - ctx->handler(ctx); - - ctx = next; - } while (ctx); - - return NGX_OK; - } - - if (rn->waiting) { - - if (ctx->event == NULL && ctx->timeout) { - ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); - if (ctx->event == NULL) { - return NGX_ERROR; - } - - ctx->event->handler = ngx_resolver_timeout_handler; - ctx->event->data = ctx; - ctx->event->log = r->log; - ctx->ident = -1; - - ngx_add_timer(ctx->event, ctx->timeout); - } - - last->next = rn->waiting; - rn->waiting = ctx; - ctx->state = NGX_AGAIN; - - do { - ctx->node = rn; - ctx = ctx->next; - } while (ctx); - - return NGX_AGAIN; - } - - ngx_queue_remove(&rn->queue); - - /* lock alloc mutex */ - - if (rn->query) { - ngx_resolver_free_locked(r, rn->query); - rn->query = NULL; -#if (NGX_HAVE_INET6) - rn->query6 = NULL; -#endif - } - - if (rn->cnlen) { - ngx_resolver_free_locked(r, rn->u.cname); - } - - if (rn->naddrs > 1 && rn->naddrs != (u_short) -1) { - ngx_resolver_free_locked(r, rn->u.addrs); - } - -#if (NGX_HAVE_INET6) - if (rn->naddrs6 > 1 && rn->naddrs6 != (u_short) -1) { - ngx_resolver_free_locked(r, rn->u6.addrs6); - } -#endif - - if (rn->nsrvs) { - for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) { - if (rn->u.srvs[i].name.data) { - ngx_resolver_free_locked(r, rn->u.srvs[i].name.data); - } - } - - ngx_resolver_free_locked(r, rn->u.srvs); - } - - /* unlock alloc mutex */ - - } else { - - rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); - if (rn == NULL) { - return NGX_ERROR; - } - - rn->name = ngx_resolver_dup(r, name->data, name->len); - if (rn->name == NULL) { - ngx_resolver_free(r, rn); - return NGX_ERROR; - } - - rn->node.key = hash; - rn->nlen = (u_short) name->len; - rn->query = NULL; -#if (NGX_HAVE_INET6) - rn->query6 = NULL; -#endif - - ngx_rbtree_insert(tree, &rn->node); - } - - if (ctx->service.len) { - rc = ngx_resolver_create_srv_query(r, rn, name); - - } else { - rc = ngx_resolver_create_name_query(r, rn, name); - } - - if (rc == NGX_ERROR) { - goto failed; - } - - if (rc == NGX_DECLINED) { - ngx_rbtree_delete(tree, &rn->node); - - ngx_resolver_free(r, rn->query); - ngx_resolver_free(r, rn->name); - ngx_resolver_free(r, rn); - - do { - ctx->state = NGX_RESOLVE_NXDOMAIN; - next = ctx->next; - - ctx->handler(ctx); - - ctx = next; - } while (ctx); - - return NGX_OK; - } - - rn->last_connection = r->last_connection++; - if (r->last_connection == r->connections.nelts) { - r->last_connection = 0; - } - - rn->naddrs = (u_short) -1; - rn->tcp = 0; -#if (NGX_HAVE_INET6) - rn->naddrs6 = r->ipv6 ? (u_short) -1 : 0; - rn->tcp6 = 0; -#endif - rn->nsrvs = 0; - - if (ngx_resolver_send_query(r, rn) != NGX_OK) { - goto failed; - } - - if (ctx->event == NULL && ctx->timeout) { - ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); - if (ctx->event == NULL) { - goto failed; - } - - ctx->event->handler = ngx_resolver_timeout_handler; - ctx->event->data = ctx; - ctx->event->log = r->log; - ctx->ident = -1; - - ngx_add_timer(ctx->event, ctx->timeout); - } - - if (ngx_resolver_resend_empty(r)) { - ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); - } - - rn->expire = ngx_time() + r->resend_timeout; - - ngx_queue_insert_head(resend_queue, &rn->queue); - - rn->code = 0; - rn->cnlen = 0; - rn->valid = 0; - rn->ttl = NGX_MAX_UINT32_VALUE; - rn->waiting = ctx; - - ctx->state = NGX_AGAIN; - - do { - ctx->node = rn; - ctx = ctx->next; - } while (ctx); - - return NGX_AGAIN; - -failed: - - ngx_rbtree_delete(tree, &rn->node); - - if (rn->query) { - ngx_resolver_free(r, rn->query); - } - - ngx_resolver_free(r, rn->name); - - ngx_resolver_free(r, rn); - - return NGX_ERROR; -} - - -ngx_int_t -ngx_resolve_addr(ngx_resolver_ctx_t *ctx) -{ - u_char *name; - in_addr_t addr; - ngx_queue_t *resend_queue, *expire_queue; - ngx_rbtree_t *tree; - ngx_resolver_t *r; - struct sockaddr_in *sin; - ngx_resolver_node_t *rn; -#if (NGX_HAVE_INET6) - uint32_t hash; - struct sockaddr_in6 *sin6; -#endif - -#if (NGX_SUPPRESS_WARN) - addr = 0; -#if (NGX_HAVE_INET6) - hash = 0; - sin6 = NULL; -#endif -#endif - - r = ctx->resolver; - - switch (ctx->addr.sockaddr->sa_family) { - -#if (NGX_HAVE_INET6) - case AF_INET6: - sin6 = (struct sockaddr_in6 *) ctx->addr.sockaddr; - hash = ngx_crc32_short(sin6->sin6_addr.s6_addr, 16); - - /* lock addr mutex */ - - rn = ngx_resolver_lookup_addr6(r, &sin6->sin6_addr, hash); - - tree = &r->addr6_rbtree; - resend_queue = &r->addr6_resend_queue; - expire_queue = &r->addr6_expire_queue; - - break; -#endif - - default: /* AF_INET */ - sin = (struct sockaddr_in *) ctx->addr.sockaddr; - addr = ntohl(sin->sin_addr.s_addr); - - /* lock addr mutex */ - - rn = ngx_resolver_lookup_addr(r, addr); - - tree = &r->addr_rbtree; - resend_queue = &r->addr_resend_queue; - expire_queue = &r->addr_expire_queue; - } - - if (rn) { - - if (rn->valid >= ngx_time()) { - - ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); - - ngx_queue_remove(&rn->queue); - - rn->expire = ngx_time() + r->expire; - - ngx_queue_insert_head(expire_queue, &rn->queue); - - name = ngx_resolver_dup(r, rn->name, rn->nlen); - if (name == NULL) { - goto failed; - } - - ctx->name.len = rn->nlen; - ctx->name.data = name; - - /* unlock addr mutex */ - - ctx->state = NGX_OK; - ctx->valid = rn->valid; - - ctx->handler(ctx); - - ngx_resolver_free(r, name); - - return NGX_OK; - } - - if (rn->waiting) { - - if (ctx->event == NULL && ctx->timeout) { - ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); - if (ctx->event == NULL) { - return NGX_ERROR; - } - - ctx->event->handler = ngx_resolver_timeout_handler; - ctx->event->data = ctx; - ctx->event->log = r->log; - ctx->ident = -1; - - ngx_add_timer(ctx->event, ctx->timeout); - } - - ctx->next = rn->waiting; - rn->waiting = ctx; - ctx->state = NGX_AGAIN; - ctx->node = rn; - - /* unlock addr mutex */ - - return NGX_OK; - } - - ngx_queue_remove(&rn->queue); - - ngx_resolver_free(r, rn->query); - rn->query = NULL; -#if (NGX_HAVE_INET6) - rn->query6 = NULL; -#endif - - } else { - rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); - if (rn == NULL) { - goto failed; - } - - switch (ctx->addr.sockaddr->sa_family) { - -#if (NGX_HAVE_INET6) - case AF_INET6: - rn->addr6 = sin6->sin6_addr; - rn->node.key = hash; - break; -#endif - - default: /* AF_INET */ - rn->node.key = addr; - } - - rn->query = NULL; -#if (NGX_HAVE_INET6) - rn->query6 = NULL; -#endif - - ngx_rbtree_insert(tree, &rn->node); - } - - if (ngx_resolver_create_addr_query(r, rn, &ctx->addr) != NGX_OK) { - goto failed; - } - - rn->last_connection = r->last_connection++; - if (r->last_connection == r->connections.nelts) { - r->last_connection = 0; - } - - rn->naddrs = (u_short) -1; - rn->tcp = 0; -#if (NGX_HAVE_INET6) - rn->naddrs6 = (u_short) -1; - rn->tcp6 = 0; -#endif - rn->nsrvs = 0; - - if (ngx_resolver_send_query(r, rn) != NGX_OK) { - goto failed; - } - - if (ctx->event == NULL && ctx->timeout) { - ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); - if (ctx->event == NULL) { - goto failed; - } - - ctx->event->handler = ngx_resolver_timeout_handler; - ctx->event->data = ctx; - ctx->event->log = r->log; - ctx->ident = -1; - - ngx_add_timer(ctx->event, ctx->timeout); - } - - if (ngx_resolver_resend_empty(r)) { - ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); - } - - rn->expire = ngx_time() + r->resend_timeout; - - ngx_queue_insert_head(resend_queue, &rn->queue); - - rn->code = 0; - rn->cnlen = 0; - rn->name = NULL; - rn->nlen = 0; - rn->valid = 0; - rn->ttl = NGX_MAX_UINT32_VALUE; - rn->waiting = ctx; - - /* unlock addr mutex */ - - ctx->state = NGX_AGAIN; - ctx->node = rn; - - return NGX_OK; - -failed: - - if (rn) { - ngx_rbtree_delete(tree, &rn->node); - - if (rn->query) { - ngx_resolver_free(r, rn->query); - } - - ngx_resolver_free(r, rn); - } - - /* unlock addr mutex */ - - if (ctx->event) { - ngx_resolver_free(r, ctx->event); - } - - ngx_resolver_free(r, ctx); - - return NGX_ERROR; -} - - -void -ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) -{ - ngx_queue_t *expire_queue; - ngx_rbtree_t *tree; - ngx_resolver_t *r; - ngx_resolver_ctx_t *w, **p; - ngx_resolver_node_t *rn; - - r = ctx->resolver; - - switch (ctx->addr.sockaddr->sa_family) { - -#if (NGX_HAVE_INET6) - case AF_INET6: - tree = &r->addr6_rbtree; - expire_queue = &r->addr6_expire_queue; - break; -#endif - - default: /* AF_INET */ - tree = &r->addr_rbtree; - expire_queue = &r->addr_expire_queue; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolve addr done: %i", ctx->state); - - if (ctx->event && ctx->event->timer_set) { - ngx_del_timer(ctx->event); - } - - /* lock addr mutex */ - - if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { - - rn = ctx->node; - - if (rn) { - p = &rn->waiting; - w = rn->waiting; - - while (w) { - if (w == ctx) { - *p = w->next; - - goto done; - } - - p = &w->next; - w = w->next; - } - } - - { - u_char text[NGX_SOCKADDR_STRLEN]; - ngx_str_t addrtext; - - addrtext.data = text; - addrtext.len = ngx_sock_ntop(ctx->addr.sockaddr, ctx->addr.socklen, - text, NGX_SOCKADDR_STRLEN, 0); - - ngx_log_error(NGX_LOG_ALERT, r->log, 0, - "could not cancel %V resolving", &addrtext); - } - } - -done: - - ngx_resolver_expire(r, tree, expire_queue); - - /* unlock addr mutex */ - - /* lock alloc mutex */ - - if (ctx->event) { - ngx_resolver_free_locked(r, ctx->event); - } - - ngx_resolver_free_locked(r, ctx); - - /* unlock alloc mutex */ - - if (r->event->timer_set && ngx_resolver_resend_empty(r)) { - ngx_del_timer(r->event); - } -} - - -static void -ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) -{ - time_t now; - ngx_uint_t i; - ngx_queue_t *q; - ngx_resolver_node_t *rn; - - ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); - - now = ngx_time(); - - for (i = 0; i < 2; i++) { - if (ngx_queue_empty(queue)) { - return; - } - - q = ngx_queue_last(queue); - - rn = ngx_queue_data(q, ngx_resolver_node_t, queue); - - if (now <= rn->expire) { - return; - } - - ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); - - ngx_queue_remove(q); - - ngx_rbtree_delete(tree, &rn->node); - - ngx_resolver_free_node(r, rn); - } -} - - -static ngx_int_t -ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) -{ - ngx_int_t rc; - ngx_resolver_connection_t *rec; - - rec = r->connections.elts; - rec = &rec[rn->last_connection]; - - if (rec->log.handler == NULL) { - rec->log = *r->log; - rec->log.handler = ngx_resolver_log_error; - rec->log.data = rec; - rec->log.action = "resolving"; - } - - if (rn->naddrs == (u_short) -1) { - rc = rn->tcp ? ngx_resolver_send_tcp_query(r, rec, rn->query, rn->qlen) - : ngx_resolver_send_udp_query(r, rec, rn->query, rn->qlen); - - if (rc != NGX_OK) { - return rc; - } - } - -#if (NGX_HAVE_INET6) - - if (rn->query6 && rn->naddrs6 == (u_short) -1) { - rc = rn->tcp6 - ? ngx_resolver_send_tcp_query(r, rec, rn->query6, rn->qlen) - : ngx_resolver_send_udp_query(r, rec, rn->query6, rn->qlen); - - if (rc != NGX_OK) { - return rc; - } - } - -#endif - - return NGX_OK; -} - - -static ngx_int_t -ngx_resolver_send_udp_query(ngx_resolver_t *r, ngx_resolver_connection_t *rec, - u_char *query, u_short qlen) -{ - ssize_t n; - - if (rec->udp == NULL) { - if (ngx_udp_connect(rec) != NGX_OK) { - return NGX_ERROR; - } - - rec->udp->data = rec; - rec->udp->read->handler = ngx_resolver_udp_read; - rec->udp->read->resolver = 1; - } - - n = ngx_send(rec->udp, query, qlen); - - if (n == -1) { - return NGX_ERROR; - } - - if ((size_t) n != (size_t) qlen) { - ngx_log_error(NGX_LOG_CRIT, &rec->log, 0, "send() incomplete"); - return NGX_ERROR; - } - - return NGX_OK; -} - - -static ngx_int_t -ngx_resolver_send_tcp_query(ngx_resolver_t *r, ngx_resolver_connection_t *rec, - u_char *query, u_short qlen) -{ - ngx_buf_t *b; - ngx_int_t rc; - - rc = NGX_OK; - - if (rec->tcp == NULL) { - b = rec->read_buf; - - if (b == NULL) { - b = ngx_resolver_calloc(r, sizeof(ngx_buf_t)); - if (b == NULL) { - return NGX_ERROR; - } - - b->start = ngx_resolver_alloc(r, NGX_RESOLVER_TCP_RSIZE); - if (b->start == NULL) { - ngx_resolver_free(r, b); - return NGX_ERROR; - } - - b->end = b->start + NGX_RESOLVER_TCP_RSIZE; - - rec->read_buf = b; - } - - b->pos = b->start; - b->last = b->start; - - b = rec->write_buf; - - if (b == NULL) { - b = ngx_resolver_calloc(r, sizeof(ngx_buf_t)); - if (b == NULL) { - return NGX_ERROR; - } - - b->start = ngx_resolver_alloc(r, NGX_RESOLVER_TCP_WSIZE); - if (b->start == NULL) { - ngx_resolver_free(r, b); - return NGX_ERROR; - } - - b->end = b->start + NGX_RESOLVER_TCP_WSIZE; - - rec->write_buf = b; - } - - b->pos = b->start; - b->last = b->start; - - rc = ngx_tcp_connect(rec); - if (rc == NGX_ERROR) { - return NGX_ERROR; - } - - rec->tcp->data = rec; - rec->tcp->write->handler = ngx_resolver_tcp_write; - rec->tcp->read->handler = ngx_resolver_tcp_read; - rec->tcp->read->resolver = 1; - - ngx_add_timer(rec->tcp->write, (ngx_msec_t) (r->tcp_timeout * 1000)); - } - - b = rec->write_buf; - - if (b->end - b->last < 2 + qlen) { - ngx_log_error(NGX_LOG_CRIT, &rec->log, 0, "buffer overflow"); - return NGX_ERROR; - } - - *b->last++ = (u_char) (qlen >> 8); - *b->last++ = (u_char) qlen; - b->last = ngx_cpymem(b->last, query, qlen); - - if (rc == NGX_OK) { - ngx_resolver_tcp_write(rec->tcp->write); - } - - return NGX_OK; -} - - -static void -ngx_resolver_resend_handler(ngx_event_t *ev) -{ - time_t timer, atimer, stimer, ntimer; -#if (NGX_HAVE_INET6) - time_t a6timer; -#endif - ngx_resolver_t *r; - - r = ev->data; - - ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver resend handler"); - - /* lock name mutex */ - - ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); - - stimer = ngx_resolver_resend(r, &r->srv_rbtree, &r->srv_resend_queue); - - /* unlock name mutex */ - - /* lock addr mutex */ - - atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); - - /* unlock addr mutex */ - -#if (NGX_HAVE_INET6) - - /* lock addr6 mutex */ - - a6timer = ngx_resolver_resend(r, &r->addr6_rbtree, &r->addr6_resend_queue); - - /* unlock addr6 mutex */ - -#endif - - timer = ntimer; - - if (timer == 0) { - timer = atimer; - - } else if (atimer) { - timer = ngx_min(timer, atimer); - } - - if (timer == 0) { - timer = stimer; - - } else if (stimer) { - timer = ngx_min(timer, stimer); - } - -#if (NGX_HAVE_INET6) - - if (timer == 0) { - timer = a6timer; - - } else if (a6timer) { - timer = ngx_min(timer, a6timer); - } - -#endif - - if (timer) { - ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); - } -} - - -static time_t -ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) -{ - time_t now; - ngx_queue_t *q; - ngx_resolver_node_t *rn; - - now = ngx_time(); - - for ( ;; ) { - if (ngx_queue_empty(queue)) { - return 0; - } - - q = ngx_queue_last(queue); - - rn = ngx_queue_data(q, ngx_resolver_node_t, queue); - - if (now < rn->expire) { - return rn->expire - now; - } - - ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver resend \"%*s\" %p", - (size_t) rn->nlen, rn->name, rn->waiting); - - ngx_queue_remove(q); - - if (rn->waiting) { - - if (++rn->last_connection == r->connections.nelts) { - rn->last_connection = 0; - } - - (void) ngx_resolver_send_query(r, rn); - - rn->expire = now + r->resend_timeout; - - ngx_queue_insert_head(queue, q); - - continue; - } - - ngx_rbtree_delete(tree, &rn->node); - - ngx_resolver_free_node(r, rn); - } -} - - -static ngx_uint_t -ngx_resolver_resend_empty(ngx_resolver_t *r) -{ - return ngx_queue_empty(&r->name_resend_queue) - && ngx_queue_empty(&r->srv_resend_queue) -#if (NGX_HAVE_INET6) - && ngx_queue_empty(&r->addr6_resend_queue) -#endif - && ngx_queue_empty(&r->addr_resend_queue); -} - - -static void -ngx_resolver_udp_read(ngx_event_t *rev) -{ - ssize_t n; - ngx_connection_t *c; - ngx_resolver_connection_t *rec; - u_char buf[NGX_RESOLVER_UDP_SIZE]; - - c = rev->data; - rec = c->data; - - do { - n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); - - if (n < 0) { - return; - } - - ngx_resolver_process_response(rec->resolver, buf, n, 0); - - } while (rev->ready); -} - - -static void -ngx_resolver_tcp_write(ngx_event_t *wev) -{ - off_t sent; - ssize_t n; - ngx_buf_t *b; - ngx_resolver_t *r; - ngx_connection_t *c; - ngx_resolver_connection_t *rec; - - c = wev->data; - rec = c->data; - b = rec->write_buf; - r = rec->resolver; - - if (wev->timedout) { - goto failed; - } - - sent = c->sent; - - while (wev->ready && b->pos < b->last) { - n = ngx_send(c, b->pos, b->last - b->pos); - - if (n == NGX_AGAIN) { - break; - } - - if (n == NGX_ERROR) { - goto failed; - } - - b->pos += n; - } - - if (b->pos != b->start) { - b->last = ngx_movemem(b->start, b->pos, b->last - b->pos); - b->pos = b->start; - } - - if (c->sent != sent) { - ngx_add_timer(wev, (ngx_msec_t) (r->tcp_timeout * 1000)); - } - - if (ngx_handle_write_event(wev, 0) != NGX_OK) { - goto failed; - } - - return; - -failed: - - ngx_close_connection(c); - rec->tcp = NULL; -} - - -static void -ngx_resolver_tcp_read(ngx_event_t *rev) -{ - u_char *p; - size_t size; - ssize_t n; - u_short qlen; - ngx_buf_t *b; - ngx_resolver_t *r; - ngx_connection_t *c; - ngx_resolver_connection_t *rec; - - c = rev->data; - rec = c->data; - b = rec->read_buf; - r = rec->resolver; - - while (rev->ready) { - n = ngx_recv(c, b->last, b->end - b->last); - - if (n == NGX_AGAIN) { - break; - } - - if (n == NGX_ERROR || n == 0) { - goto failed; - } - - b->last += n; - - for ( ;; ) { - p = b->pos; - size = b->last - p; - - if (size < 2) { - break; - } - - qlen = (u_short) *p++ << 8; - qlen += *p++; - - if (size < (size_t) (2 + qlen)) { - break; - } - - ngx_resolver_process_response(r, p, qlen, 1); - - b->pos += 2 + qlen; - } - - if (b->pos != b->start) { - b->last = ngx_movemem(b->start, b->pos, b->last - b->pos); - b->pos = b->start; - } - } - - if (ngx_handle_read_event(rev, 0) != NGX_OK) { - goto failed; - } - - return; - -failed: - - ngx_close_connection(c); - rec->tcp = NULL; -} - - -static void -ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n, - ngx_uint_t tcp) -{ - char *err; - ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, trunc, - qtype, qclass; -#if (NGX_HAVE_INET6) - ngx_uint_t qident6; -#endif - ngx_queue_t *q; - ngx_resolver_qs_t *qs; - ngx_resolver_hdr_t *response; - ngx_resolver_node_t *rn; - - if (n < sizeof(ngx_resolver_hdr_t)) { - goto short_response; - } - - response = (ngx_resolver_hdr_t *) buf; - - ident = (response->ident_hi << 8) + response->ident_lo; - flags = (response->flags_hi << 8) + response->flags_lo; - nqs = (response->nqs_hi << 8) + response->nqs_lo; - nan = (response->nan_hi << 8) + response->nan_lo; - trunc = flags & 0x0200; - - ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver DNS response %ui fl:%04Xi %ui/%ui/%ud/%ud", - ident, flags, nqs, nan, - (response->nns_hi << 8) + response->nns_lo, - (response->nar_hi << 8) + response->nar_lo); - - /* response to a standard query */ - if ((flags & 0xf870) != 0x8000 || (trunc && tcp)) { - ngx_log_error(r->log_level, r->log, 0, - "invalid %s DNS response %ui fl:%04Xi", - tcp ? "TCP" : "UDP", ident, flags); - return; - } - - code = flags & 0xf; - - if (code == NGX_RESOLVE_FORMERR) { - - times = 0; - - for (q = ngx_queue_head(&r->name_resend_queue); - q != ngx_queue_sentinel(&r->name_resend_queue) && times++ < 100; - q = ngx_queue_next(q)) - { - rn = ngx_queue_data(q, ngx_resolver_node_t, queue); - qident = (rn->query[0] << 8) + rn->query[1]; - - if (qident == ident) { - goto dns_error_name; - } - -#if (NGX_HAVE_INET6) - if (rn->query6) { - qident6 = (rn->query6[0] << 8) + rn->query6[1]; - - if (qident6 == ident) { - goto dns_error_name; - } - } -#endif - } - - goto dns_error; - } - - if (code > NGX_RESOLVE_REFUSED) { - goto dns_error; - } - - if (nqs != 1) { - err = "invalid number of questions in DNS response"; - goto done; - } - - i = sizeof(ngx_resolver_hdr_t); - - while (i < (ngx_uint_t) n) { - if (buf[i] == '\0') { - goto found; - } - - i += 1 + buf[i]; - } - - goto short_response; - -found: - - if (i++ == sizeof(ngx_resolver_hdr_t)) { - err = "zero-length domain name in DNS response"; - goto done; - } - - if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) - > (ngx_uint_t) n) - { - goto short_response; - } - - qs = (ngx_resolver_qs_t *) &buf[i]; - - qtype = (qs->type_hi << 8) + qs->type_lo; - qclass = (qs->class_hi << 8) + qs->class_lo; - - ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver DNS response qt:%ui cl:%ui", qtype, qclass); - - if (qclass != 1) { - ngx_log_error(r->log_level, r->log, 0, - "unknown query class %ui in DNS response", qclass); - return; - } - - switch (qtype) { - - case NGX_RESOLVE_A: -#if (NGX_HAVE_INET6) - case NGX_RESOLVE_AAAA: -#endif - - ngx_resolver_process_a(r, buf, n, ident, code, qtype, nan, trunc, - i + sizeof(ngx_resolver_qs_t)); - - break; - - case NGX_RESOLVE_SRV: - - ngx_resolver_process_srv(r, buf, n, ident, code, nan, trunc, - i + sizeof(ngx_resolver_qs_t)); - - break; - - case NGX_RESOLVE_PTR: - - ngx_resolver_process_ptr(r, buf, n, ident, code, nan); - - break; - - default: - ngx_log_error(r->log_level, r->log, 0, - "unknown query type %ui in DNS response", qtype); - return; - } - - return; - -short_response: - - err = "short DNS response"; - -done: - - ngx_log_error(r->log_level, r->log, 0, err); - - return; - -dns_error_name: - - ngx_log_error(r->log_level, r->log, 0, - "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", - code, ngx_resolver_strerror(code), ident, - (size_t) rn->nlen, rn->name); - return; - -dns_error: - - ngx_log_error(r->log_level, r->log, 0, - "DNS error (%ui: %s), query id:%ui", - code, ngx_resolver_strerror(code), ident); - return; -} - - -static void -ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, - ngx_uint_t ident, ngx_uint_t code, ngx_uint_t qtype, - ngx_uint_t nan, ngx_uint_t trunc, ngx_uint_t ans) -{ - char *err; - u_char *cname; - size_t len; - int32_t ttl; - uint32_t hash; - in_addr_t *addr; - ngx_str_t name; - ngx_uint_t type, class, qident, naddrs, a, i, j, start; -#if (NGX_HAVE_INET6) - struct in6_addr *addr6; -#endif - ngx_resolver_an_t *an; - ngx_resolver_ctx_t *ctx, *next; - ngx_resolver_node_t *rn; - ngx_resolver_addr_t *addrs; - ngx_resolver_connection_t *rec; - - if (ngx_resolver_copy(r, &name, buf, - buf + sizeof(ngx_resolver_hdr_t), buf + n) - != NGX_OK) - { - return; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); - - hash = ngx_crc32_short(name.data, name.len); - - /* lock name mutex */ - - rn = ngx_resolver_lookup_name(r, &name, hash); - - if (rn == NULL) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected response for %V", &name); - ngx_resolver_free(r, name.data); - goto failed; - } - - switch (qtype) { - -#if (NGX_HAVE_INET6) - case NGX_RESOLVE_AAAA: - - if (rn->query6 == NULL || rn->naddrs6 != (u_short) -1) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected response for %V", &name); - ngx_resolver_free(r, name.data); - goto failed; - } - - if (trunc && rn->tcp6) { - ngx_resolver_free(r, name.data); - goto failed; - } - - qident = (rn->query6[0] << 8) + rn->query6[1]; - - break; -#endif - - default: /* NGX_RESOLVE_A */ - - if (rn->query == NULL || rn->naddrs != (u_short) -1) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected response for %V", &name); - ngx_resolver_free(r, name.data); - goto failed; - } - - if (trunc && rn->tcp) { - ngx_resolver_free(r, name.data); - goto failed; - } - - qident = (rn->query[0] << 8) + rn->query[1]; - } - - if (ident != qident) { - ngx_log_error(r->log_level, r->log, 0, - "wrong ident %ui response for %V, expect %ui", - ident, &name, qident); - ngx_resolver_free(r, name.data); - goto failed; - } - - ngx_resolver_free(r, name.data); - - if (trunc) { - - ngx_queue_remove(&rn->queue); - - if (rn->waiting == NULL) { - ngx_rbtree_delete(&r->name_rbtree, &rn->node); - ngx_resolver_free_node(r, rn); - goto next; - } - - rec = r->connections.elts; - rec = &rec[rn->last_connection]; - - switch (qtype) { - -#if (NGX_HAVE_INET6) - case NGX_RESOLVE_AAAA: - - rn->tcp6 = 1; - - (void) ngx_resolver_send_tcp_query(r, rec, rn->query6, rn->qlen); - - break; -#endif - - default: /* NGX_RESOLVE_A */ - - rn->tcp = 1; - - (void) ngx_resolver_send_tcp_query(r, rec, rn->query, rn->qlen); - } - - rn->expire = ngx_time() + r->resend_timeout; - - ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); - - goto next; - } - - if (code == 0 && rn->code) { - code = rn->code; - } - - if (code == 0 && nan == 0) { - -#if (NGX_HAVE_INET6) - switch (qtype) { - - case NGX_RESOLVE_AAAA: - - rn->naddrs6 = 0; - - if (rn->naddrs == (u_short) -1) { - goto next; - } - - if (rn->naddrs) { - goto export; - } - - break; - - default: /* NGX_RESOLVE_A */ - - rn->naddrs = 0; - - if (rn->naddrs6 == (u_short) -1) { - goto next; - } - - if (rn->naddrs6) { - goto export; - } - } -#endif - - code = NGX_RESOLVE_NXDOMAIN; - } - - if (code) { - -#if (NGX_HAVE_INET6) - switch (qtype) { - - case NGX_RESOLVE_AAAA: - - rn->naddrs6 = 0; - - if (rn->naddrs == (u_short) -1) { - rn->code = (u_char) code; - goto next; - } - - break; - - default: /* NGX_RESOLVE_A */ - - rn->naddrs = 0; - - if (rn->naddrs6 == (u_short) -1) { - rn->code = (u_char) code; - goto next; - } - } -#endif - - next = rn->waiting; - rn->waiting = NULL; - - ngx_queue_remove(&rn->queue); - - ngx_rbtree_delete(&r->name_rbtree, &rn->node); - - /* unlock name mutex */ - - while (next) { - ctx = next; - ctx->state = code; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - next = ctx->next; - - ctx->handler(ctx); - } - - ngx_resolver_free_node(r, rn); - - return; - } - - i = ans; - naddrs = 0; - cname = NULL; - - for (a = 0; a < nan; a++) { - - start = i; - - while (i < n) { - - if (buf[i] & 0xc0) { - i += 2; - goto found; - } - - if (buf[i] == 0) { - i++; - goto test_length; - } - - i += 1 + buf[i]; - } - - goto short_response; - - test_length: - - if (i - start < 2) { - err = "invalid name in DNS response"; - goto invalid; - } - - found: - - if (i + sizeof(ngx_resolver_an_t) >= n) { - goto short_response; - } - - an = (ngx_resolver_an_t *) &buf[i]; - - type = (an->type_hi << 8) + an->type_lo; - class = (an->class_hi << 8) + an->class_lo; - len = (an->len_hi << 8) + an->len_lo; - ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) - + (an->ttl[2] << 8) + (an->ttl[3]); - - if (class != 1) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected RR class %ui", class); - goto failed; - } - - if (ttl < 0) { - ttl = 0; - } - - rn->ttl = ngx_min(rn->ttl, (uint32_t) ttl); - - i += sizeof(ngx_resolver_an_t); - - switch (type) { - - case NGX_RESOLVE_A: - - if (qtype != NGX_RESOLVE_A) { - err = "unexpected A record in DNS response"; - goto invalid; - } - - if (len != 4) { - err = "invalid A record in DNS response"; - goto invalid; - } - - if (i + 4 > n) { - goto short_response; - } - - naddrs++; - - break; - -#if (NGX_HAVE_INET6) - case NGX_RESOLVE_AAAA: - - if (qtype != NGX_RESOLVE_AAAA) { - err = "unexpected AAAA record in DNS response"; - goto invalid; - } - - if (len != 16) { - err = "invalid AAAA record in DNS response"; - goto invalid; - } - - if (i + 16 > n) { - goto short_response; - } - - naddrs++; - - break; -#endif - - case NGX_RESOLVE_CNAME: - - cname = &buf[i]; - - break; - - case NGX_RESOLVE_DNAME: - - break; - - default: - - ngx_log_error(r->log_level, r->log, 0, - "unexpected RR type %ui", type); - } - - i += len; - } - - ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver naddrs:%ui cname:%p ttl:%uD", - naddrs, cname, rn->ttl); - - if (naddrs) { - - switch (qtype) { - -#if (NGX_HAVE_INET6) - case NGX_RESOLVE_AAAA: - - if (naddrs == 1) { - addr6 = &rn->u6.addr6; - rn->naddrs6 = 1; - - } else { - addr6 = ngx_resolver_alloc(r, naddrs * sizeof(struct in6_addr)); - if (addr6 == NULL) { - goto failed; - } - - rn->u6.addrs6 = addr6; - rn->naddrs6 = (u_short) naddrs; - } - -#if (NGX_SUPPRESS_WARN) - addr = NULL; -#endif - - break; -#endif - - default: /* NGX_RESOLVE_A */ - - if (naddrs == 1) { - addr = &rn->u.addr; - rn->naddrs = 1; - - } else { - addr = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); - if (addr == NULL) { - goto failed; - } - - rn->u.addrs = addr; - rn->naddrs = (u_short) naddrs; - } - -#if (NGX_HAVE_INET6 && NGX_SUPPRESS_WARN) - addr6 = NULL; -#endif - } - - j = 0; - i = ans; - - for (a = 0; a < nan; a++) { - - for ( ;; ) { - - if (buf[i] & 0xc0) { - i += 2; - break; - } - - if (buf[i] == 0) { - i++; - break; - } - - i += 1 + buf[i]; - } - - an = (ngx_resolver_an_t *) &buf[i]; - - type = (an->type_hi << 8) + an->type_lo; - len = (an->len_hi << 8) + an->len_lo; - - i += sizeof(ngx_resolver_an_t); - - if (type == NGX_RESOLVE_A) { - - addr[j] = htonl((buf[i] << 24) + (buf[i + 1] << 16) - + (buf[i + 2] << 8) + (buf[i + 3])); - - if (++j == naddrs) { - -#if (NGX_HAVE_INET6) - if (rn->naddrs6 == (u_short) -1) { - goto next; - } -#endif - - break; - } - } - -#if (NGX_HAVE_INET6) - else if (type == NGX_RESOLVE_AAAA) { - - ngx_memcpy(addr6[j].s6_addr, &buf[i], 16); - - if (++j == naddrs) { - - if (rn->naddrs == (u_short) -1) { - goto next; - } - - break; - } - } -#endif - - i += len; - } - } - - switch (qtype) { - -#if (NGX_HAVE_INET6) - case NGX_RESOLVE_AAAA: - - if (rn->naddrs6 == (u_short) -1) { - rn->naddrs6 = 0; - } - - break; -#endif - - default: /* NGX_RESOLVE_A */ - - if (rn->naddrs == (u_short) -1) { - rn->naddrs = 0; - } - } - - if (rn->naddrs != (u_short) -1 -#if (NGX_HAVE_INET6) - && rn->naddrs6 != (u_short) -1 -#endif - && rn->naddrs -#if (NGX_HAVE_INET6) - + rn->naddrs6 -#endif - > 0) - { - -#if (NGX_HAVE_INET6) - export: -#endif - - naddrs = rn->naddrs; -#if (NGX_HAVE_INET6) - naddrs += rn->naddrs6; -#endif - - if (naddrs == 1 && rn->naddrs == 1) { - addrs = NULL; - - } else { - addrs = ngx_resolver_export(r, rn, 0); - if (addrs == NULL) { - goto failed; - } - } - - ngx_queue_remove(&rn->queue); - - rn->valid = ngx_time() + (r->valid ? r->valid : (time_t) rn->ttl); - rn->expire = ngx_time() + r->expire; - - ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); - - next = rn->waiting; - rn->waiting = NULL; - - /* unlock name mutex */ - - while (next) { - ctx = next; - ctx->state = NGX_OK; - ctx->valid = rn->valid; - ctx->naddrs = naddrs; - - if (addrs == NULL) { - ctx->addrs = &ctx->addr; - ctx->addr.sockaddr = (struct sockaddr *) &ctx->sin; - ctx->addr.socklen = sizeof(struct sockaddr_in); - ngx_memzero(&ctx->sin, sizeof(struct sockaddr_in)); - ctx->sin.sin_family = AF_INET; - ctx->sin.sin_addr.s_addr = rn->u.addr; - - } else { - ctx->addrs = addrs; - } - - next = ctx->next; - - ctx->handler(ctx); - } - - if (addrs != NULL) { - ngx_resolver_free(r, addrs->sockaddr); - ngx_resolver_free(r, addrs); - } - - ngx_resolver_free(r, rn->query); - rn->query = NULL; -#if (NGX_HAVE_INET6) - rn->query6 = NULL; -#endif - - return; - } - - if (cname) { - - /* CNAME only */ - - if (rn->naddrs == (u_short) -1 -#if (NGX_HAVE_INET6) - || rn->naddrs6 == (u_short) -1 -#endif - ) - { - goto next; - } - - if (ngx_resolver_copy(r, &name, buf, cname, buf + n) != NGX_OK) { - goto failed; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver cname:\"%V\"", &name); - - ngx_queue_remove(&rn->queue); - - rn->cnlen = (u_short) name.len; - rn->u.cname = name.data; - - rn->valid = ngx_time() + (r->valid ? r->valid : (time_t) rn->ttl); - rn->expire = ngx_time() + r->expire; - - ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); - - ngx_resolver_free(r, rn->query); - rn->query = NULL; -#if (NGX_HAVE_INET6) - rn->query6 = NULL; -#endif - - ctx = rn->waiting; - rn->waiting = NULL; - - if (ctx) { - - if (ctx->recursion++ >= NGX_RESOLVER_MAX_RECURSION) { - - /* unlock name mutex */ - - do { - ctx->state = NGX_RESOLVE_NXDOMAIN; - next = ctx->next; - - ctx->handler(ctx); - - ctx = next; - } while (ctx); - - return; - } - - for (next = ctx; next; next = next->next) { - next->node = NULL; - } - - (void) ngx_resolve_name_locked(r, ctx, &name); - } - - /* unlock name mutex */ - - return; - } - - ngx_log_error(r->log_level, r->log, 0, - "no A or CNAME types in DNS response"); - return; - -short_response: - - err = "short DNS response"; - -invalid: - - /* unlock name mutex */ - - ngx_log_error(r->log_level, r->log, 0, err); - - return; - -failed: - -next: - - /* unlock name mutex */ - - return; -} - - -static void -ngx_resolver_process_srv(ngx_resolver_t *r, u_char *buf, size_t n, - ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, - ngx_uint_t trunc, ngx_uint_t ans) -{ - char *err; - u_char *cname; - size_t len; - int32_t ttl; - uint32_t hash; - ngx_str_t name; - ngx_uint_t type, qident, class, start, nsrvs, a, i, j; - ngx_resolver_an_t *an; - ngx_resolver_ctx_t *ctx, *next; - ngx_resolver_srv_t *srvs; - ngx_resolver_node_t *rn; - ngx_resolver_connection_t *rec; - - if (ngx_resolver_copy(r, &name, buf, - buf + sizeof(ngx_resolver_hdr_t), buf + n) - != NGX_OK) - { - return; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); - - hash = ngx_crc32_short(name.data, name.len); - - rn = ngx_resolver_lookup_srv(r, &name, hash); - - if (rn == NULL || rn->query == NULL) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected response for %V", &name); - ngx_resolver_free(r, name.data); - goto failed; - } - - if (trunc && rn->tcp) { - ngx_resolver_free(r, name.data); - goto failed; - } - - qident = (rn->query[0] << 8) + rn->query[1]; - - if (ident != qident) { - ngx_log_error(r->log_level, r->log, 0, - "wrong ident %ui response for %V, expect %ui", - ident, &name, qident); - ngx_resolver_free(r, name.data); - goto failed; - } - - ngx_resolver_free(r, name.data); - - if (trunc) { - - ngx_queue_remove(&rn->queue); - - if (rn->waiting == NULL) { - ngx_rbtree_delete(&r->srv_rbtree, &rn->node); - ngx_resolver_free_node(r, rn); - return; - } - - rec = r->connections.elts; - rec = &rec[rn->last_connection]; - - rn->tcp = 1; - - (void) ngx_resolver_send_tcp_query(r, rec, rn->query, rn->qlen); - - rn->expire = ngx_time() + r->resend_timeout; - - ngx_queue_insert_head(&r->srv_resend_queue, &rn->queue); - - return; - } - - if (code == 0 && rn->code) { - code = rn->code; - } - - if (code == 0 && nan == 0) { - code = NGX_RESOLVE_NXDOMAIN; - } - - if (code) { - next = rn->waiting; - rn->waiting = NULL; - - ngx_queue_remove(&rn->queue); - - ngx_rbtree_delete(&r->srv_rbtree, &rn->node); - - while (next) { - ctx = next; - ctx->state = code; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - next = ctx->next; - - ctx->handler(ctx); - } - - ngx_resolver_free_node(r, rn); - - return; - } - - i = ans; - nsrvs = 0; - cname = NULL; - - for (a = 0; a < nan; a++) { - - start = i; - - while (i < n) { - - if (buf[i] & 0xc0) { - i += 2; - goto found; - } - - if (buf[i] == 0) { - i++; - goto test_length; - } - - i += 1 + buf[i]; - } - - goto short_response; - - test_length: - - if (i - start < 2) { - err = "invalid name DNS response"; - goto invalid; - } - - found: - - if (i + sizeof(ngx_resolver_an_t) >= n) { - goto short_response; - } - - an = (ngx_resolver_an_t *) &buf[i]; - - type = (an->type_hi << 8) + an->type_lo; - class = (an->class_hi << 8) + an->class_lo; - len = (an->len_hi << 8) + an->len_lo; - ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) - + (an->ttl[2] << 8) + (an->ttl[3]); - - if (class != 1) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected RR class %ui", class); - goto failed; - } - - if (ttl < 0) { - ttl = 0; - } - - rn->ttl = ngx_min(rn->ttl, (uint32_t) ttl); - - i += sizeof(ngx_resolver_an_t); - - switch (type) { - - case NGX_RESOLVE_SRV: - - if (i + 6 > n) { - goto short_response; - } - - if (ngx_resolver_copy(r, NULL, buf, &buf[i + 6], buf + n) - != NGX_OK) - { - goto failed; - } - - nsrvs++; - - break; - - case NGX_RESOLVE_CNAME: - - cname = &buf[i]; - - break; - - case NGX_RESOLVE_DNAME: - - break; - - default: - - ngx_log_error(r->log_level, r->log, 0, - "unexpected RR type %ui", type); - } - - i += len; - } - - ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver nsrvs:%ui cname:%p ttl:%uD", - nsrvs, cname, rn->ttl); - - if (nsrvs) { - - srvs = ngx_resolver_calloc(r, nsrvs * sizeof(ngx_resolver_srv_t)); - if (srvs == NULL) { - goto failed; - } - - rn->u.srvs = srvs; - rn->nsrvs = (u_short) nsrvs; - - j = 0; - i = ans; - - for (a = 0; a < nan; a++) { - - for ( ;; ) { - - if (buf[i] & 0xc0) { - i += 2; - break; - } - - if (buf[i] == 0) { - i++; - break; - } - - i += 1 + buf[i]; - } - - an = (ngx_resolver_an_t *) &buf[i]; - - type = (an->type_hi << 8) + an->type_lo; - len = (an->len_hi << 8) + an->len_lo; - - i += sizeof(ngx_resolver_an_t); - - if (type == NGX_RESOLVE_SRV) { - - srvs[j].priority = (buf[i] << 8) + buf[i + 1]; - srvs[j].weight = (buf[i + 2] << 8) + buf[i + 3]; - - if (srvs[j].weight == 0) { - srvs[j].weight = 1; - } - - srvs[j].port = (buf[i + 4] << 8) + buf[i + 5]; - - if (ngx_resolver_copy(r, &srvs[j].name, buf, &buf[i + 6], - buf + n) - != NGX_OK) - { - goto failed; - } - - j++; - } - - i += len; - } - - ngx_sort(srvs, nsrvs, sizeof(ngx_resolver_srv_t), - ngx_resolver_cmp_srvs); - - ngx_resolver_free(r, rn->query); - rn->query = NULL; - - ngx_queue_remove(&rn->queue); - - rn->valid = ngx_time() + (r->valid ? r->valid : (time_t) rn->ttl); - rn->expire = ngx_time() + r->expire; - - ngx_queue_insert_head(&r->srv_expire_queue, &rn->queue); - - next = rn->waiting; - rn->waiting = NULL; - - while (next) { - ctx = next; - next = ctx->next; - - ngx_resolver_resolve_srv_names(ctx, rn); - } - - return; - } - - rn->nsrvs = 0; - - if (cname) { - - /* CNAME only */ - - if (ngx_resolver_copy(r, &name, buf, cname, buf + n) != NGX_OK) { - goto failed; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver cname:\"%V\"", &name); - - ngx_queue_remove(&rn->queue); - - rn->cnlen = (u_short) name.len; - rn->u.cname = name.data; - - rn->valid = ngx_time() + (r->valid ? r->valid : (time_t) rn->ttl); - rn->expire = ngx_time() + r->expire; - - ngx_queue_insert_head(&r->srv_expire_queue, &rn->queue); - - ngx_resolver_free(r, rn->query); - rn->query = NULL; -#if (NGX_HAVE_INET6) - rn->query6 = NULL; -#endif - - ctx = rn->waiting; - rn->waiting = NULL; - - if (ctx) { - - if (ctx->recursion++ >= NGX_RESOLVER_MAX_RECURSION) { - - /* unlock name mutex */ - - do { - ctx->state = NGX_RESOLVE_NXDOMAIN; - next = ctx->next; - - ctx->handler(ctx); - - ctx = next; - } while (ctx); - - return; - } - - for (next = ctx; next; next = next->next) { - next->node = NULL; - } - - (void) ngx_resolve_name_locked(r, ctx, &name); - } - - /* unlock name mutex */ - - return; - } - - ngx_log_error(r->log_level, r->log, 0, "no SRV type in DNS response"); - - return; - -short_response: - - err = "short DNS response"; - -invalid: - - /* unlock name mutex */ - - ngx_log_error(r->log_level, r->log, 0, err); - - return; - -failed: - - /* unlock name mutex */ - - return; -} - - -static void -ngx_resolver_resolve_srv_names(ngx_resolver_ctx_t *ctx, ngx_resolver_node_t *rn) -{ - ngx_uint_t i; - ngx_resolver_t *r; - ngx_resolver_ctx_t *cctx; - ngx_resolver_srv_name_t *srvs; - - r = ctx->resolver; - - ctx->node = NULL; - ctx->state = NGX_OK; - ctx->valid = rn->valid; - ctx->count = rn->nsrvs; - - srvs = ngx_resolver_calloc(r, rn->nsrvs * sizeof(ngx_resolver_srv_name_t)); - if (srvs == NULL) { - goto failed; - } - - ctx->srvs = srvs; - ctx->nsrvs = rn->nsrvs; - - if (ctx->event && ctx->event->timer_set) { - ngx_del_timer(ctx->event); - } - - for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) { - srvs[i].name.data = ngx_resolver_alloc(r, rn->u.srvs[i].name.len); - if (srvs[i].name.data == NULL) { - goto failed; - } - - srvs[i].name.len = rn->u.srvs[i].name.len; - ngx_memcpy(srvs[i].name.data, rn->u.srvs[i].name.data, - srvs[i].name.len); - - cctx = ngx_resolve_start(r, NULL); - if (cctx == NULL) { - goto failed; - } - - cctx->name = srvs[i].name; - cctx->handler = ngx_resolver_srv_names_handler; - cctx->data = ctx; - cctx->srvs = &srvs[i]; - cctx->timeout = ctx->timeout; - - srvs[i].priority = rn->u.srvs[i].priority; - srvs[i].weight = rn->u.srvs[i].weight; - srvs[i].port = rn->u.srvs[i].port; - srvs[i].ctx = cctx; - - if (ngx_resolve_name(cctx) == NGX_ERROR) { - srvs[i].ctx = NULL; - goto failed; - } - } - - return; - -failed: - - ctx->state = NGX_ERROR; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - - ctx->handler(ctx); -} - - -static void -ngx_resolver_srv_names_handler(ngx_resolver_ctx_t *cctx) -{ - ngx_uint_t i; - ngx_addr_t *addrs; - ngx_resolver_t *r; - ngx_sockaddr_t *sockaddr; - ngx_resolver_ctx_t *ctx; - ngx_resolver_srv_name_t *srv; - - r = cctx->resolver; - ctx = cctx->data; - srv = cctx->srvs; - - ctx->count--; - - srv->ctx = NULL; - srv->state = cctx->state; - - if (cctx->naddrs) { - - ctx->valid = ngx_min(ctx->valid, cctx->valid); - - addrs = ngx_resolver_calloc(r, cctx->naddrs * sizeof(ngx_addr_t)); - if (addrs == NULL) { - ngx_resolve_name_done(cctx); - - ctx->state = NGX_ERROR; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - - ctx->handler(ctx); - return; - } - - sockaddr = ngx_resolver_alloc(r, cctx->naddrs * sizeof(ngx_sockaddr_t)); - if (sockaddr == NULL) { - ngx_resolver_free(r, addrs); - ngx_resolve_name_done(cctx); - - ctx->state = NGX_ERROR; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - - ctx->handler(ctx); - return; - } - - for (i = 0; i < cctx->naddrs; i++) { - addrs[i].sockaddr = &sockaddr[i].sockaddr; - addrs[i].socklen = cctx->addrs[i].socklen; - - ngx_memcpy(&sockaddr[i], cctx->addrs[i].sockaddr, - addrs[i].socklen); - - ngx_inet_set_port(addrs[i].sockaddr, srv->port); - } - - srv->addrs = addrs; - srv->naddrs = cctx->naddrs; - } - - ngx_resolve_name_done(cctx); - - if (ctx->count == 0) { - ngx_resolver_report_srv(r, ctx); - } -} - - -static void -ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, - ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) -{ - char *err; - size_t len; - in_addr_t addr; - int32_t ttl; - ngx_int_t octet; - ngx_str_t name; - ngx_uint_t mask, type, class, qident, a, i, start; - ngx_queue_t *expire_queue; - ngx_rbtree_t *tree; - ngx_resolver_an_t *an; - ngx_resolver_ctx_t *ctx, *next; - ngx_resolver_node_t *rn; -#if (NGX_HAVE_INET6) - uint32_t hash; - ngx_int_t digit; - struct in6_addr addr6; -#endif - - if (ngx_resolver_copy(r, &name, buf, - buf + sizeof(ngx_resolver_hdr_t), buf + n) - != NGX_OK) - { - return; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); - - /* AF_INET */ - - addr = 0; - i = sizeof(ngx_resolver_hdr_t); - - for (mask = 0; mask < 32; mask += 8) { - len = buf[i++]; - - octet = ngx_atoi(&buf[i], len); - if (octet == NGX_ERROR || octet > 255) { - goto invalid_in_addr_arpa; - } - - addr += octet << mask; - i += len; - } - - if (ngx_strcasecmp(&buf[i], (u_char *) "\7in-addr\4arpa") == 0) { - i += sizeof("\7in-addr\4arpa"); - - /* lock addr mutex */ - - rn = ngx_resolver_lookup_addr(r, addr); - - tree = &r->addr_rbtree; - expire_queue = &r->addr_expire_queue; - - goto valid; - } - -invalid_in_addr_arpa: - -#if (NGX_HAVE_INET6) - - i = sizeof(ngx_resolver_hdr_t); - - for (octet = 15; octet >= 0; octet--) { - if (buf[i++] != '\1') { - goto invalid_ip6_arpa; - } - - digit = ngx_hextoi(&buf[i++], 1); - if (digit == NGX_ERROR) { - goto invalid_ip6_arpa; - } - - addr6.s6_addr[octet] = (u_char) digit; - - if (buf[i++] != '\1') { - goto invalid_ip6_arpa; - } - - digit = ngx_hextoi(&buf[i++], 1); - if (digit == NGX_ERROR) { - goto invalid_ip6_arpa; - } - - addr6.s6_addr[octet] += (u_char) (digit * 16); - } - - if (ngx_strcasecmp(&buf[i], (u_char *) "\3ip6\4arpa") == 0) { - i += sizeof("\3ip6\4arpa"); - - /* lock addr mutex */ - - hash = ngx_crc32_short(addr6.s6_addr, 16); - rn = ngx_resolver_lookup_addr6(r, &addr6, hash); - - tree = &r->addr6_rbtree; - expire_queue = &r->addr6_expire_queue; - - goto valid; - } - -invalid_ip6_arpa: -#endif - - ngx_log_error(r->log_level, r->log, 0, - "invalid in-addr.arpa or ip6.arpa name in DNS response"); - ngx_resolver_free(r, name.data); - return; - -valid: - - if (rn == NULL || rn->query == NULL) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected response for %V", &name); - ngx_resolver_free(r, name.data); - goto failed; - } - - qident = (rn->query[0] << 8) + rn->query[1]; - - if (ident != qident) { - ngx_log_error(r->log_level, r->log, 0, - "wrong ident %ui response for %V, expect %ui", - ident, &name, qident); - ngx_resolver_free(r, name.data); - goto failed; - } - - ngx_resolver_free(r, name.data); - - if (code == 0 && nan == 0) { - code = NGX_RESOLVE_NXDOMAIN; - } - - if (code) { - next = rn->waiting; - rn->waiting = NULL; - - ngx_queue_remove(&rn->queue); - - ngx_rbtree_delete(tree, &rn->node); - - /* unlock addr mutex */ - - while (next) { - ctx = next; - ctx->state = code; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - next = ctx->next; - - ctx->handler(ctx); - } - - ngx_resolver_free_node(r, rn); - - return; - } - - i += sizeof(ngx_resolver_qs_t); - - for (a = 0; a < nan; a++) { - - start = i; - - while (i < n) { - - if (buf[i] & 0xc0) { - i += 2; - goto found; - } - - if (buf[i] == 0) { - i++; - goto test_length; - } - - i += 1 + buf[i]; - } - - goto short_response; - - test_length: - - if (i - start < 2) { - err = "invalid name in DNS response"; - goto invalid; - } - - found: - - if (i + sizeof(ngx_resolver_an_t) >= n) { - goto short_response; - } - - an = (ngx_resolver_an_t *) &buf[i]; - - type = (an->type_hi << 8) + an->type_lo; - class = (an->class_hi << 8) + an->class_lo; - len = (an->len_hi << 8) + an->len_lo; - ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) - + (an->ttl[2] << 8) + (an->ttl[3]); - - if (class != 1) { - ngx_log_error(r->log_level, r->log, 0, - "unexpected RR class %ui", class); - goto failed; - } - - if (ttl < 0) { - ttl = 0; - } - - ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolver qt:%ui cl:%ui len:%uz", - type, class, len); - - i += sizeof(ngx_resolver_an_t); - - switch (type) { - - case NGX_RESOLVE_PTR: - - goto ptr; - - case NGX_RESOLVE_CNAME: - - break; - - default: - - ngx_log_error(r->log_level, r->log, 0, - "unexpected RR type %ui", type); - } - - i += len; - } - - /* unlock addr mutex */ - - ngx_log_error(r->log_level, r->log, 0, - "no PTR type in DNS response"); - return; - -ptr: - - if (ngx_resolver_copy(r, &name, buf, buf + i, buf + n) != NGX_OK) { - goto failed; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); - - if (name.len != (size_t) rn->nlen - || ngx_strncmp(name.data, rn->name, name.len) != 0) - { - if (rn->nlen) { - ngx_resolver_free(r, rn->name); - } - - rn->nlen = (u_short) name.len; - rn->name = name.data; - - name.data = ngx_resolver_dup(r, rn->name, name.len); - if (name.data == NULL) { - goto failed; - } - } - - ngx_queue_remove(&rn->queue); - - rn->valid = ngx_time() + (r->valid ? r->valid : ttl); - rn->expire = ngx_time() + r->expire; - - ngx_queue_insert_head(expire_queue, &rn->queue); - - next = rn->waiting; - rn->waiting = NULL; - - /* unlock addr mutex */ - - while (next) { - ctx = next; - ctx->state = NGX_OK; - ctx->valid = rn->valid; - ctx->name = name; - next = ctx->next; - - ctx->handler(ctx); - } - - ngx_resolver_free(r, name.data); - - return; - -short_response: - - err = "short DNS response"; - -invalid: - - /* unlock addr mutex */ - - ngx_log_error(r->log_level, r->log, 0, err); - - return; - -failed: - - /* unlock addr mutex */ - - return; -} - - -static ngx_resolver_node_t * -ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) -{ - ngx_int_t rc; - ngx_rbtree_node_t *node, *sentinel; - ngx_resolver_node_t *rn; - - node = r->name_rbtree.root; - sentinel = r->name_rbtree.sentinel; - - while (node != sentinel) { - - if (hash < node->key) { - node = node->left; - continue; - } - - if (hash > node->key) { - node = node->right; - continue; - } - - /* hash == node->key */ - - rn = ngx_resolver_node(node); - - rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); - - if (rc == 0) { - return rn; - } - - node = (rc < 0) ? node->left : node->right; - } - - /* not found */ - - return NULL; -} - - -static ngx_resolver_node_t * -ngx_resolver_lookup_srv(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) -{ - ngx_int_t rc; - ngx_rbtree_node_t *node, *sentinel; - ngx_resolver_node_t *rn; - - node = r->srv_rbtree.root; - sentinel = r->srv_rbtree.sentinel; - - while (node != sentinel) { - - if (hash < node->key) { - node = node->left; - continue; - } - - if (hash > node->key) { - node = node->right; - continue; - } - - /* hash == node->key */ - - rn = ngx_resolver_node(node); - - rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); - - if (rc == 0) { - return rn; - } - - node = (rc < 0) ? node->left : node->right; - } - - /* not found */ - - return NULL; -} - - -static ngx_resolver_node_t * -ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) -{ - ngx_rbtree_node_t *node, *sentinel; - - node = r->addr_rbtree.root; - sentinel = r->addr_rbtree.sentinel; - - while (node != sentinel) { - - if (addr < node->key) { - node = node->left; - continue; - } - - if (addr > node->key) { - node = node->right; - continue; - } - - /* addr == node->key */ - - return ngx_resolver_node(node); - } - - /* not found */ - - return NULL; -} - - -#if (NGX_HAVE_INET6) - -static ngx_resolver_node_t * -ngx_resolver_lookup_addr6(ngx_resolver_t *r, struct in6_addr *addr, - uint32_t hash) -{ - ngx_int_t rc; - ngx_rbtree_node_t *node, *sentinel; - ngx_resolver_node_t *rn; - - node = r->addr6_rbtree.root; - sentinel = r->addr6_rbtree.sentinel; - - while (node != sentinel) { - - if (hash < node->key) { - node = node->left; - continue; - } - - if (hash > node->key) { - node = node->right; - continue; - } - - /* hash == node->key */ - - rn = ngx_resolver_node(node); - - rc = ngx_memcmp(addr, &rn->addr6, 16); - - if (rc == 0) { - return rn; - } - - node = (rc < 0) ? node->left : node->right; - } - - /* not found */ - - return NULL; -} - -#endif - - -static void -ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, - ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) -{ - ngx_rbtree_node_t **p; - ngx_resolver_node_t *rn, *rn_temp; - - for ( ;; ) { - - if (node->key < temp->key) { - - p = &temp->left; - - } else if (node->key > temp->key) { - - p = &temp->right; - - } else { /* node->key == temp->key */ - - rn = ngx_resolver_node(node); - rn_temp = ngx_resolver_node(temp); - - p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) - < 0) ? &temp->left : &temp->right; - } - - if (*p == sentinel) { - break; - } - - temp = *p; - } - - *p = node; - node->parent = temp; - node->left = sentinel; - node->right = sentinel; - ngx_rbt_red(node); -} - - -#if (NGX_HAVE_INET6) - -static void -ngx_resolver_rbtree_insert_addr6_value(ngx_rbtree_node_t *temp, - ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) -{ - ngx_rbtree_node_t **p; - ngx_resolver_node_t *rn, *rn_temp; - - for ( ;; ) { - - if (node->key < temp->key) { - - p = &temp->left; - - } else if (node->key > temp->key) { - - p = &temp->right; - - } else { /* node->key == temp->key */ - - rn = ngx_resolver_node(node); - rn_temp = ngx_resolver_node(temp); - - p = (ngx_memcmp(&rn->addr6, &rn_temp->addr6, 16) - < 0) ? &temp->left : &temp->right; - } - - if (*p == sentinel) { - break; - } - - temp = *p; - } - - *p = node; - node->parent = temp; - node->left = sentinel; - node->right = sentinel; - ngx_rbt_red(node); -} - -#endif - - -static ngx_int_t -ngx_resolver_create_name_query(ngx_resolver_t *r, ngx_resolver_node_t *rn, - ngx_str_t *name) -{ - u_char *p, *s; - size_t len, nlen; - ngx_uint_t ident; - ngx_resolver_qs_t *qs; - ngx_resolver_hdr_t *query; - - nlen = name->len ? (1 + name->len + 1) : 1; - - len = sizeof(ngx_resolver_hdr_t) + nlen + sizeof(ngx_resolver_qs_t); - -#if (NGX_HAVE_INET6) - p = ngx_resolver_alloc(r, r->ipv6 ? len * 2 : len); -#else - p = ngx_resolver_alloc(r, len); -#endif - if (p == NULL) { - return NGX_ERROR; - } - - rn->qlen = (u_short) len; - rn->query = p; - -#if (NGX_HAVE_INET6) - if (r->ipv6) { - rn->query6 = p + len; - } -#endif - - query = (ngx_resolver_hdr_t *) p; - - ident = ngx_random(); - - ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolve: \"%V\" A %i", name, ident & 0xffff); - - query->ident_hi = (u_char) ((ident >> 8) & 0xff); - query->ident_lo = (u_char) (ident & 0xff); - - /* recursion query */ - query->flags_hi = 1; query->flags_lo = 0; - - /* one question */ - query->nqs_hi = 0; query->nqs_lo = 1; - query->nan_hi = 0; query->nan_lo = 0; - query->nns_hi = 0; query->nns_lo = 0; - query->nar_hi = 0; query->nar_lo = 0; - - p += sizeof(ngx_resolver_hdr_t) + nlen; - - qs = (ngx_resolver_qs_t *) p; - - /* query type */ - qs->type_hi = 0; qs->type_lo = NGX_RESOLVE_A; - - /* IN query class */ - qs->class_hi = 0; qs->class_lo = 1; - - /* convert "www.example.com" to "\3www\7example\3com\0" */ - - len = 0; - p--; - *p-- = '\0'; - - if (name->len == 0) { - return NGX_DECLINED; - } - - for (s = name->data + name->len - 1; s >= name->data; s--) { - if (*s != '.') { - *p = *s; - len++; - - } else { - if (len == 0 || len > 255) { - return NGX_DECLINED; - } - - *p = (u_char) len; - len = 0; - } - - p--; - } - - if (len == 0 || len > 255) { - return NGX_DECLINED; - } - - *p = (u_char) len; - -#if (NGX_HAVE_INET6) - if (!r->ipv6) { - return NGX_OK; - } - - p = rn->query6; - - ngx_memcpy(p, rn->query, rn->qlen); - - query = (ngx_resolver_hdr_t *) p; - - ident = ngx_random(); - - ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolve: \"%V\" AAAA %i", name, ident & 0xffff); - - query->ident_hi = (u_char) ((ident >> 8) & 0xff); - query->ident_lo = (u_char) (ident & 0xff); - - p += sizeof(ngx_resolver_hdr_t) + nlen; - - qs = (ngx_resolver_qs_t *) p; - - qs->type_lo = NGX_RESOLVE_AAAA; -#endif - - return NGX_OK; -} - - -static ngx_int_t -ngx_resolver_create_srv_query(ngx_resolver_t *r, ngx_resolver_node_t *rn, - ngx_str_t *name) -{ - u_char *p, *s; - size_t len, nlen; - ngx_uint_t ident; - ngx_resolver_qs_t *qs; - ngx_resolver_hdr_t *query; - - nlen = name->len ? (1 + name->len + 1) : 1; - - len = sizeof(ngx_resolver_hdr_t) + nlen + sizeof(ngx_resolver_qs_t); - - p = ngx_resolver_alloc(r, len); - if (p == NULL) { - return NGX_ERROR; - } - - rn->qlen = (u_short) len; - rn->query = p; - - query = (ngx_resolver_hdr_t *) p; - - ident = ngx_random(); - - ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, - "resolve: \"%V\" SRV %i", name, ident & 0xffff); - - query->ident_hi = (u_char) ((ident >> 8) & 0xff); - query->ident_lo = (u_char) (ident & 0xff); - - /* recursion query */ - query->flags_hi = 1; query->flags_lo = 0; - - /* one question */ - query->nqs_hi = 0; query->nqs_lo = 1; - query->nan_hi = 0; query->nan_lo = 0; - query->nns_hi = 0; query->nns_lo = 0; - query->nar_hi = 0; query->nar_lo = 0; - - p += sizeof(ngx_resolver_hdr_t) + nlen; - - qs = (ngx_resolver_qs_t *) p; - - /* query type */ - qs->type_hi = 0; qs->type_lo = NGX_RESOLVE_SRV; - - /* IN query class */ - qs->class_hi = 0; qs->class_lo = 1; - - /* converts "www.example.com" to "\3www\7example\3com\0" */ - - len = 0; - p--; - *p-- = '\0'; - - if (name->len == 0) { - return NGX_DECLINED; - } - - for (s = name->data + name->len - 1; s >= name->data; s--) { - if (*s != '.') { - *p = *s; - len++; - - } else { - if (len == 0 || len > 255) { - return NGX_DECLINED; - } - - *p = (u_char) len; - len = 0; - } - - p--; - } - - if (len == 0 || len > 255) { - return NGX_DECLINED; - } - - *p = (u_char) len; - - return NGX_OK; -} - - -static ngx_int_t -ngx_resolver_create_addr_query(ngx_resolver_t *r, ngx_resolver_node_t *rn, - ngx_resolver_addr_t *addr) -{ - u_char *p, *d; - size_t len; - in_addr_t inaddr; - ngx_int_t n; - ngx_uint_t ident; - ngx_resolver_hdr_t *query; - struct sockaddr_in *sin; -#if (NGX_HAVE_INET6) - struct sockaddr_in6 *sin6; -#endif - - switch (addr->sockaddr->sa_family) { - -#if (NGX_HAVE_INET6) - case AF_INET6: - len = sizeof(ngx_resolver_hdr_t) - + 64 + sizeof(".ip6.arpa.") - 1 - + sizeof(ngx_resolver_qs_t); - - break; -#endif - - default: /* AF_INET */ - len = sizeof(ngx_resolver_hdr_t) - + sizeof(".255.255.255.255.in-addr.arpa.") - 1 - + sizeof(ngx_resolver_qs_t); - } - - p = ngx_resolver_alloc(r, len); - if (p == NULL) { - return NGX_ERROR; - } - - rn->query = p; - query = (ngx_resolver_hdr_t *) p; - - ident = ngx_random(); - - query->ident_hi = (u_char) ((ident >> 8) & 0xff); - query->ident_lo = (u_char) (ident & 0xff); - - /* recursion query */ - query->flags_hi = 1; query->flags_lo = 0; - - /* one question */ - query->nqs_hi = 0; query->nqs_lo = 1; - query->nan_hi = 0; query->nan_lo = 0; - query->nns_hi = 0; query->nns_lo = 0; - query->nar_hi = 0; query->nar_lo = 0; - - p += sizeof(ngx_resolver_hdr_t); - - switch (addr->sockaddr->sa_family) { - -#if (NGX_HAVE_INET6) - case AF_INET6: - sin6 = (struct sockaddr_in6 *) addr->sockaddr; - - for (n = 15; n >= 0; n--) { - p = ngx_sprintf(p, "\1%xd\1%xd", - sin6->sin6_addr.s6_addr[n] & 0xf, - (sin6->sin6_addr.s6_addr[n] >> 4) & 0xf); - } - - p = ngx_cpymem(p, "\3ip6\4arpa\0", 10); - - break; -#endif - - default: /* AF_INET */ - - sin = (struct sockaddr_in *) addr->sockaddr; - inaddr = ntohl(sin->sin_addr.s_addr); - - for (n = 0; n < 32; n += 8) { - d = ngx_sprintf(&p[1], "%ud", (inaddr >> n) & 0xff); - *p = (u_char) (d - &p[1]); - p = d; - } - - p = ngx_cpymem(p, "\7in-addr\4arpa\0", 14); - } - - /* query type "PTR", IN query class */ - p = ngx_cpymem(p, "\0\14\0\1", 4); - - rn->qlen = (u_short) (p - rn->query); - - return NGX_OK; -} - - -static ngx_int_t -ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, - u_char *last) -{ - char *err; - u_char *p, *dst; - ssize_t len; - ngx_uint_t i, n; - - p = src; - len = -1; - - /* - * compression pointers allow to create endless loop, so we set limit; - * 128 pointers should be enough to store 255-byte name - */ - - for (i = 0; i < 128; i++) { - n = *p++; - - if (n == 0) { - goto done; - } - - if (n & 0xc0) { - n = ((n & 0x3f) << 8) + *p; - p = &buf[n]; - - } else { - len += 1 + n; - p = &p[n]; - } - - if (p >= last) { - err = "name is out of response"; - goto invalid; - } - } - - err = "compression pointers loop"; - -invalid: - - ngx_log_error(r->log_level, r->log, 0, err); - - return NGX_ERROR; - -done: - - if (name == NULL) { - return NGX_OK; - } - - if (len == -1) { - ngx_str_null(name); - return NGX_OK; - } - - dst = ngx_resolver_alloc(r, len); - if (dst == NULL) { - return NGX_ERROR; - } - - name->data = dst; - - n = *src++; - - for ( ;; ) { - if (n & 0xc0) { - n = ((n & 0x3f) << 8) + *src; - src = &buf[n]; - - n = *src++; - - } else { - ngx_strlow(dst, src, n); - dst += n; - src += n; - - n = *src++; - - if (n != 0) { - *dst++ = '.'; - } - } - - if (n == 0) { - name->len = dst - name->data; - return NGX_OK; - } - } -} - - -static void -ngx_resolver_timeout_handler(ngx_event_t *ev) -{ - ngx_resolver_ctx_t *ctx; - - ctx = ev->data; - - ctx->state = NGX_RESOLVE_TIMEDOUT; - - ctx->handler(ctx); -} - - -static void -ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) -{ - ngx_uint_t i; - - /* lock alloc mutex */ - - if (rn->query) { - ngx_resolver_free_locked(r, rn->query); - } - - if (rn->name) { - ngx_resolver_free_locked(r, rn->name); - } - - if (rn->cnlen) { - ngx_resolver_free_locked(r, rn->u.cname); - } - - if (rn->naddrs > 1 && rn->naddrs != (u_short) -1) { - ngx_resolver_free_locked(r, rn->u.addrs); - } - -#if (NGX_HAVE_INET6) - if (rn->naddrs6 > 1 && rn->naddrs6 != (u_short) -1) { - ngx_resolver_free_locked(r, rn->u6.addrs6); - } -#endif - - if (rn->nsrvs) { - for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) { - if (rn->u.srvs[i].name.data) { - ngx_resolver_free_locked(r, rn->u.srvs[i].name.data); - } - } - - ngx_resolver_free_locked(r, rn->u.srvs); - } - - ngx_resolver_free_locked(r, rn); - - /* unlock alloc mutex */ -} - - -static void * -ngx_resolver_alloc(ngx_resolver_t *r, size_t size) -{ - u_char *p; - - /* lock alloc mutex */ - - p = ngx_alloc(size, r->log); - - /* unlock alloc mutex */ - - return p; -} - - -static void * -ngx_resolver_calloc(ngx_resolver_t *r, size_t size) -{ - u_char *p; - - p = ngx_resolver_alloc(r, size); - - if (p) { - ngx_memzero(p, size); - } - - return p; -} - - -static void -ngx_resolver_free(ngx_resolver_t *r, void *p) -{ - /* lock alloc mutex */ - - ngx_free(p); - - /* unlock alloc mutex */ -} - - -static void -ngx_resolver_free_locked(ngx_resolver_t *r, void *p) -{ - ngx_free(p); -} - - -static void * -ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) -{ - void *dst; - - dst = ngx_resolver_alloc(r, size); - - if (dst == NULL) { - return dst; - } - - ngx_memcpy(dst, src, size); - - return dst; -} - - -static ngx_resolver_addr_t * -ngx_resolver_export(ngx_resolver_t *r, ngx_resolver_node_t *rn, - ngx_uint_t rotate) -{ - ngx_uint_t d, i, j, n; - in_addr_t *addr; - ngx_sockaddr_t *sockaddr; - struct sockaddr_in *sin; - ngx_resolver_addr_t *dst; -#if (NGX_HAVE_INET6) - struct in6_addr *addr6; - struct sockaddr_in6 *sin6; -#endif - - n = rn->naddrs; -#if (NGX_HAVE_INET6) - n += rn->naddrs6; -#endif - - dst = ngx_resolver_calloc(r, n * sizeof(ngx_resolver_addr_t)); - if (dst == NULL) { - return NULL; - } - - sockaddr = ngx_resolver_calloc(r, n * sizeof(ngx_sockaddr_t)); - if (sockaddr == NULL) { - ngx_resolver_free(r, dst); - return NULL; - } - - i = 0; - d = rotate ? ngx_random() % n : 0; - - if (rn->naddrs) { - j = rotate ? ngx_random() % rn->naddrs : 0; - - addr = (rn->naddrs == 1) ? &rn->u.addr : rn->u.addrs; - - do { - sin = &sockaddr[d].sockaddr_in; - sin->sin_family = AF_INET; - sin->sin_addr.s_addr = addr[j++]; - dst[d].sockaddr = (struct sockaddr *) sin; - dst[d++].socklen = sizeof(struct sockaddr_in); - - if (d == n) { - d = 0; - } - - if (j == (ngx_uint_t) rn->naddrs) { - j = 0; - } - } while (++i < (ngx_uint_t) rn->naddrs); - } - -#if (NGX_HAVE_INET6) - if (rn->naddrs6) { - j = rotate ? ngx_random() % rn->naddrs6 : 0; - - addr6 = (rn->naddrs6 == 1) ? &rn->u6.addr6 : rn->u6.addrs6; - - do { - sin6 = &sockaddr[d].sockaddr_in6; - sin6->sin6_family = AF_INET6; - ngx_memcpy(sin6->sin6_addr.s6_addr, addr6[j++].s6_addr, 16); - dst[d].sockaddr = (struct sockaddr *) sin6; - dst[d++].socklen = sizeof(struct sockaddr_in6); - - if (d == n) { - d = 0; - } - - if (j == rn->naddrs6) { - j = 0; - } - } while (++i < n); - } -#endif - - return dst; -} - - -static void -ngx_resolver_report_srv(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) -{ - ngx_uint_t naddrs, nsrvs, nw, i, j, k, l, m, n, w; - ngx_resolver_addr_t *addrs; - ngx_resolver_srv_name_t *srvs; - - naddrs = 0; - - for (i = 0; i < ctx->nsrvs; i++) { - naddrs += ctx->srvs[i].naddrs; - } - - if (naddrs == 0) { - ctx->state = NGX_RESOLVE_NXDOMAIN; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - - ctx->handler(ctx); - return; - } - - addrs = ngx_resolver_calloc(r, naddrs * sizeof(ngx_resolver_addr_t)); - if (addrs == NULL) { - ctx->state = NGX_ERROR; - ctx->valid = ngx_time() + (r->valid ? r->valid : 10); - - ctx->handler(ctx); - return; - } - - srvs = ctx->srvs; - nsrvs = ctx->nsrvs; - - i = 0; - n = 0; - - do { - nw = 0; - - for (j = i; j < nsrvs; j++) { - if (srvs[j].priority != srvs[i].priority) { - break; - } - - nw += srvs[j].naddrs * srvs[j].weight; - } - - if (nw == 0) { - goto next_srv; - } - - w = ngx_random() % nw; - - for (k = i; k < j; k++) { - if (w < srvs[k].naddrs * srvs[k].weight) { - break; - } - - w -= srvs[k].naddrs * srvs[k].weight; - } - - for (l = i; l < j; l++) { - - for (m = 0; m < srvs[k].naddrs; m++) { - addrs[n].socklen = srvs[k].addrs[m].socklen; - addrs[n].sockaddr = srvs[k].addrs[m].sockaddr; - addrs[n].name = srvs[k].name; - addrs[n].priority = srvs[k].priority; - addrs[n].weight = srvs[k].weight; - n++; - } - - if (++k == j) { - k = i; - } - } - -next_srv: - - i = j; - - } while (i < ctx->nsrvs); - - ctx->state = NGX_OK; - ctx->addrs = addrs; - ctx->naddrs = naddrs; - - ctx->handler(ctx); - - ngx_resolver_free(r, addrs); -} - - -char * -ngx_resolver_strerror(ngx_int_t err) -{ - static char *errors[] = { - "Format error", /* FORMERR */ - "Server failure", /* SERVFAIL */ - "Host not found", /* NXDOMAIN */ - "Unimplemented", /* NOTIMP */ - "Operation refused" /* REFUSED */ - }; - - if (err > 0 && err < 6) { - return errors[err - 1]; - } - - if (err == NGX_RESOLVE_TIMEDOUT) { - return "Operation timed out"; - } - - return "Unknown error"; -} - - -static u_char * -ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) -{ - u_char *p; - ngx_resolver_connection_t *rec; - - p = buf; - - if (log->action) { - p = ngx_snprintf(buf, len, " while %s", log->action); - len -= p - buf; - } - - rec = log->data; - - if (rec) { - p = ngx_snprintf(p, len, ", resolver: %V", &rec->server); - } - - return p; -} - - -static ngx_int_t -ngx_udp_connect(ngx_resolver_connection_t *rec) -{ - int rc; - ngx_int_t event; - ngx_event_t *rev, *wev; - ngx_socket_t s; - ngx_connection_t *c; - - s = ngx_socket(rec->sockaddr->sa_family, SOCK_DGRAM, 0); - - ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &rec->log, 0, "UDP socket %d", s); - - if (s == (ngx_socket_t) -1) { - ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno, - ngx_socket_n " failed"); - return NGX_ERROR; - } - - c = ngx_get_connection(s, &rec->log); - - if (c == NULL) { - if (ngx_close_socket(s) == -1) { - ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno, - ngx_close_socket_n "failed"); - } - - return NGX_ERROR; - } - - if (ngx_nonblocking(s) == -1) { - ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno, - ngx_nonblocking_n " failed"); - - goto failed; - } - - rev = c->read; - wev = c->write; - - rev->log = &rec->log; - wev->log = &rec->log; - - rec->udp = c; - - c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); - - ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &rec->log, 0, - "connect to %V, fd:%d #%uA", &rec->server, s, c->number); - - rc = connect(s, rec->sockaddr, rec->socklen); - - /* TODO: iocp */ - - if (rc == -1) { - ngx_log_error(NGX_LOG_CRIT, &rec->log, ngx_socket_errno, - "connect() failed"); - - goto failed; - } - - /* UDP sockets are always ready to write */ - wev->ready = 1; - - event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? - /* kqueue, epoll */ NGX_CLEAR_EVENT: - /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; - /* eventport event type has no meaning: oneshot only */ - - if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { - goto failed; - } - - return NGX_OK; - -failed: - - ngx_close_connection(c); - rec->udp = NULL; - - return NGX_ERROR; -} - - -static ngx_int_t -ngx_tcp_connect(ngx_resolver_connection_t *rec) -{ - int rc; - ngx_int_t event; - ngx_err_t err; - ngx_uint_t level; - ngx_socket_t s; - ngx_event_t *rev, *wev; - ngx_connection_t *c; - - s = ngx_socket(rec->sockaddr->sa_family, SOCK_STREAM, 0); - - ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &rec->log, 0, "TCP socket %d", s); - - if (s == (ngx_socket_t) -1) { - ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno, - ngx_socket_n " failed"); - return NGX_ERROR; - } - - c = ngx_get_connection(s, &rec->log); - - if (c == NULL) { - if (ngx_close_socket(s) == -1) { - ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno, - ngx_close_socket_n "failed"); - } - - return NGX_ERROR; - } - - if (ngx_nonblocking(s) == -1) { - ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno, - ngx_nonblocking_n " failed"); - - goto failed; - } - - rev = c->read; - wev = c->write; - - rev->log = &rec->log; - wev->log = &rec->log; - - rec->tcp = c; - - c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); - - if (ngx_add_conn) { - if (ngx_add_conn(c) == NGX_ERROR) { - goto failed; - } - } - - ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &rec->log, 0, - "connect to %V, fd:%d #%uA", &rec->server, s, c->number); - - rc = connect(s, rec->sockaddr, rec->socklen); - - if (rc == -1) { - err = ngx_socket_errno; - - - if (err != NGX_EINPROGRESS -#if (NGX_WIN32) - /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */ - && err != NGX_EAGAIN -#endif - ) - { - if (err == NGX_ECONNREFUSED -#if (NGX_LINUX) - /* - * Linux returns EAGAIN instead of ECONNREFUSED - * for unix sockets if listen queue is full - */ - || err == NGX_EAGAIN -#endif - || err == NGX_ECONNRESET - || err == NGX_ENETDOWN - || err == NGX_ENETUNREACH - || err == NGX_EHOSTDOWN - || err == NGX_EHOSTUNREACH) - { - level = NGX_LOG_ERR; - - } else { - level = NGX_LOG_CRIT; - } - - ngx_log_error(level, c->log, err, "connect() to %V failed", - &rec->server); - - ngx_close_connection(c); - rec->tcp = NULL; - - return NGX_ERROR; - } - } - - if (ngx_add_conn) { - if (rc == -1) { - - /* NGX_EINPROGRESS */ - - return NGX_AGAIN; - } - - ngx_log_debug0(NGX_LOG_DEBUG_EVENT, &rec->log, 0, "connected"); - - wev->ready = 1; - - return NGX_OK; - } - - if (ngx_event_flags & NGX_USE_IOCP_EVENT) { - - ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &rec->log, ngx_socket_errno, - "connect(): %d", rc); - - if (ngx_blocking(s) == -1) { - ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno, - ngx_blocking_n " failed"); - goto failed; - } - - /* - * FreeBSD's aio allows to post an operation on non-connected socket. - * NT does not support it. - * - * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT - */ - - rev->ready = 1; - wev->ready = 1; - - return NGX_OK; - } - - if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { - - /* kqueue */ - - event = NGX_CLEAR_EVENT; - - } else { - - /* select, poll, /dev/poll */ - - event = NGX_LEVEL_EVENT; - } - - if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { - goto failed; - } - - if (rc == -1) { - - /* NGX_EINPROGRESS */ - - if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) { - goto failed; - } - - return NGX_AGAIN; - } - - ngx_log_debug0(NGX_LOG_DEBUG_EVENT, &rec->log, 0, "connected"); - - wev->ready = 1; - - return NGX_OK; - -failed: - - ngx_close_connection(c); - rec->tcp = NULL; - - return NGX_ERROR; -} - - -static ngx_int_t -ngx_resolver_cmp_srvs(const void *one, const void *two) -{ - ngx_int_t p1, p2; - ngx_resolver_srv_t *first, *second; - - first = (ngx_resolver_srv_t *) one; - second = (ngx_resolver_srv_t *) two; - - p1 = first->priority; - p2 = second->priority; - - return p1 - p2; -} |