static ngx_int_t ngx_http_limit_conn_handler(ngx_http_request_t *r) { syslog(LOG_INFO, "[%s:%s:%d]", __FILE__, __func__, __LINE__); size_t len, n; uint32_t hash; ngx_uint_t i; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *node; ngx_pool_cleanup_t *cln; ngx_http_variable_value_t *vv; ngx_http_limit_conn_ctx_t *ctx; ngx_http_limit_conn_node_t *lc; ngx_http_limit_conn_conf_t *lccf; ngx_http_limit_conn_limit_t *limits; ngx_http_limit_conn_cleanup_t *lccln; if (r->main->limit_conn_set) { return NGX_DECLINED; } lccf = ngx_http_get_module_loc_conf(r, ngx_http_limit_conn_module); limits = lccf->limits.elts; for (i = 0; i < lccf->limits.nelts; i++) { ctx = limits[i].shm_zone->data; vv = ngx_http_get_indexed_variable(r, ctx->index); if (vv == NULL || vv->not_found) { continue; } len = vv->len; if (len == 0) { continue; } if (len > 255) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "the value of the \"%V\" variable " "is more than 255 bytes: \"%v\"", &ctx->var, vv); continue; } r->main->limit_conn_set = 1; hash = ngx_crc32_short(vv->data, len); shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr; ngx_shmtx_lock(&shpool->mutex); node = ngx_http_limit_conn_lookup(ctx->rbtree, vv, hash); if (node == NULL) { n = offsetof(ngx_rbtree_node_t, color) + offsetof(ngx_http_limit_conn_node_t, data) + len; node = ngx_slab_alloc_locked(shpool, n); if (node == NULL) { ngx_shmtx_unlock(&shpool->mutex); ngx_http_limit_conn_cleanup_all(r->pool); return NGX_HTTP_SERVICE_UNAVAILABLE; } lc = (ngx_http_limit_conn_node_t *) &node->color; node->key = hash; lc->len = (u_char) len; lc->conn = 1; ngx_memcpy(lc->data, vv->data, len); ngx_rbtree_insert(ctx->rbtree, node); } else { lc = (ngx_http_limit_conn_node_t *) &node->color; if ((ngx_uint_t) lc->conn >= limits[i].conn) { ngx_shmtx_unlock(&shpool->mutex); ngx_log_error(lccf->log_level, r->connection->log, 0, "limiting connections by zone \"%V\"", &limits[i].shm_zone->shm.name); ngx_http_limit_conn_cleanup_all(r->pool); return NGX_HTTP_SERVICE_UNAVAILABLE; } lc->conn++; } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "limit conn: %08XD %d", node->key, lc->conn); ngx_shmtx_unlock(&shpool->mutex); cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_conn_cleanup_t)); if (cln == NULL) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } cln->handler = ngx_http_limit_conn_cleanup; lccln = cln->data; lccln->shm_zone = limits[i].shm_zone; lccln->node = node; } return NGX_DECLINED; }
static ngx_int_t ngx_http_limit_conn_handler(ngx_http_request_t *r) { size_t n; uint32_t hash; ngx_str_t key; ngx_uint_t i; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *node; ngx_pool_cleanup_t *cln; ngx_http_limit_conn_ctx_t *ctx; ngx_http_limit_conn_node_t *lc; ngx_http_limit_conn_conf_t *lccf; ngx_http_limit_conn_limit_t *limits; ngx_http_limit_conn_cleanup_t *lccln; if (r->main->limit_conn_set) { return NGX_DECLINED; } lccf = ngx_http_get_module_loc_conf(r, ngx_http_limit_conn_module); limits = lccf->limits.elts; for (i = 0; i < lccf->limits.nelts; i++) { ctx = limits[i].shm_zone->data; if (ngx_http_complex_value(r, &ctx->key, &key) != NGX_OK) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } if (key.len == 0) { continue; } if (key.len > 255) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "the value of the \"%V\" key " "is more than 255 bytes: \"%V\"", &ctx->key.value, &key); continue; } r->main->limit_conn_set = 1; hash = ngx_crc32_short(key.data, key.len); shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr; ngx_shmtx_lock(&shpool->mutex); node = ngx_http_limit_conn_lookup(ctx->rbtree, &key, hash); if (node == NULL) { n = offsetof(ngx_rbtree_node_t, color) + offsetof(ngx_http_limit_conn_node_t, data) + key.len; node = ngx_slab_alloc_locked(shpool, n); if (node == NULL) { ngx_shmtx_unlock(&shpool->mutex); ngx_http_limit_conn_cleanup_all(r->pool); return lccf->status_code; } lc = (ngx_http_limit_conn_node_t *) &node->color; node->key = hash; lc->len = (u_char) key.len; lc->conn = 1; ngx_memcpy(lc->data, key.data, key.len); ngx_rbtree_insert(ctx->rbtree, node); } else { lc = (ngx_http_limit_conn_node_t *) &node->color; if ((ngx_uint_t) lc->conn >= limits[i].conn) { ngx_shmtx_unlock(&shpool->mutex); ngx_log_error(lccf->log_level, r->connection->log, 0, "limiting connections by zone \"%V\"", &limits[i].shm_zone->shm.name); ngx_http_limit_conn_cleanup_all(r->pool); return lccf->status_code; } lc->conn++; } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "limit conn: %08XD %d", node->key, lc->conn); ngx_shmtx_unlock(&shpool->mutex); cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_conn_cleanup_t)); if (cln == NULL) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } cln->handler = ngx_http_limit_conn_cleanup; lccln = cln->data; lccln->shm_zone = limits[i].shm_zone; lccln->node = node; } return NGX_DECLINED; }