Mercurial > hg > nginx
view src/stream/ngx_stream_limit_conn_module.c @ 7516:36c52a0f6ded
Perl: disabled not_modified filter (ticket #1786).
Embedded perl does not set any request fields needed for conditional
requests processing. Further, filter finalization in the not_modified
filter can cause segmentation faults due to cleared ctx as in
ticket #1786.
Before 5fb1e57c758a (1.7.3) the not_modified filter was implicitly disabled
for perl responses, as r->headers_out.last_modified_time was -1. This
change restores this behaviour by using the explicit r->disable_not_modified
flag.
Note that this patch doesn't try to address perl module robustness against
filter finalization and other errors returned from filter chains. It should
be eventually reworked to handle errors instead of ignoring them.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 17 Jun 2019 19:48:56 +0300 |
parents | 3908156a51fa |
children | 359b0ea2b067 |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_stream.h> typedef struct { u_char color; u_char len; u_short conn; u_char data[1]; } ngx_stream_limit_conn_node_t; typedef struct { ngx_shm_zone_t *shm_zone; ngx_rbtree_node_t *node; } ngx_stream_limit_conn_cleanup_t; typedef struct { ngx_rbtree_t *rbtree; ngx_stream_complex_value_t key; } ngx_stream_limit_conn_ctx_t; typedef struct { ngx_shm_zone_t *shm_zone; ngx_uint_t conn; } ngx_stream_limit_conn_limit_t; typedef struct { ngx_array_t limits; ngx_uint_t log_level; } ngx_stream_limit_conn_conf_t; static ngx_rbtree_node_t *ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_str_t *key, uint32_t hash); static void ngx_stream_limit_conn_cleanup(void *data); static ngx_inline void ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool); static void *ngx_stream_limit_conn_create_conf(ngx_conf_t *cf); static char *ngx_stream_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_stream_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_stream_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_stream_limit_conn_init(ngx_conf_t *cf); static ngx_conf_enum_t ngx_stream_limit_conn_log_levels[] = { { ngx_string("info"), NGX_LOG_INFO }, { ngx_string("notice"), NGX_LOG_NOTICE }, { ngx_string("warn"), NGX_LOG_WARN }, { ngx_string("error"), NGX_LOG_ERR }, { ngx_null_string, 0 } }; static ngx_command_t ngx_stream_limit_conn_commands[] = { { ngx_string("limit_conn_zone"), NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE2, ngx_stream_limit_conn_zone, 0, 0, NULL }, { ngx_string("limit_conn"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE2, ngx_stream_limit_conn, NGX_STREAM_SRV_CONF_OFFSET, 0, NULL }, { ngx_string("limit_conn_log_level"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_enum_slot, NGX_STREAM_SRV_CONF_OFFSET, offsetof(ngx_stream_limit_conn_conf_t, log_level), &ngx_stream_limit_conn_log_levels }, ngx_null_command }; static ngx_stream_module_t ngx_stream_limit_conn_module_ctx = { NULL, /* preconfiguration */ ngx_stream_limit_conn_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_stream_limit_conn_create_conf, /* create server configuration */ ngx_stream_limit_conn_merge_conf /* merge server configuration */ }; ngx_module_t ngx_stream_limit_conn_module = { NGX_MODULE_V1, &ngx_stream_limit_conn_module_ctx, /* module context */ ngx_stream_limit_conn_commands, /* module directives */ NGX_STREAM_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_int_t ngx_stream_limit_conn_handler(ngx_stream_session_t *s) { 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_stream_limit_conn_ctx_t *ctx; ngx_stream_limit_conn_node_t *lc; ngx_stream_limit_conn_conf_t *lccf; ngx_stream_limit_conn_limit_t *limits; ngx_stream_limit_conn_cleanup_t *lccln; lccf = ngx_stream_get_module_srv_conf(s, ngx_stream_limit_conn_module); limits = lccf->limits.elts; for (i = 0; i < lccf->limits.nelts; i++) { ctx = limits[i].shm_zone->data; if (ngx_stream_complex_value(s, &ctx->key, &key) != NGX_OK) { return NGX_ERROR; } if (key.len == 0) { continue; } if (key.len > 255) { ngx_log_error(NGX_LOG_ERR, s->connection->log, 0, "the value of the \"%V\" key " "is more than 255 bytes: \"%V\"", &ctx->key.value, &key); continue; } 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_stream_limit_conn_lookup(ctx->rbtree, &key, hash); if (node == NULL) { n = offsetof(ngx_rbtree_node_t, color) + offsetof(ngx_stream_limit_conn_node_t, data) + key.len; node = ngx_slab_alloc_locked(shpool, n); if (node == NULL) { ngx_shmtx_unlock(&shpool->mutex); ngx_stream_limit_conn_cleanup_all(s->connection->pool); return NGX_STREAM_SERVICE_UNAVAILABLE; } lc = (ngx_stream_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_stream_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, s->connection->log, 0, "limiting connections by zone \"%V\"", &limits[i].shm_zone->shm.name); ngx_stream_limit_conn_cleanup_all(s->connection->pool); return NGX_STREAM_SERVICE_UNAVAILABLE; } lc->conn++; } ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, "limit conn: %08Xi %d", node->key, lc->conn); ngx_shmtx_unlock(&shpool->mutex); cln = ngx_pool_cleanup_add(s->connection->pool, sizeof(ngx_stream_limit_conn_cleanup_t)); if (cln == NULL) { return NGX_ERROR; } cln->handler = ngx_stream_limit_conn_cleanup; lccln = cln->data; lccln->shm_zone = limits[i].shm_zone; lccln->node = node; } return NGX_DECLINED; } static void ngx_stream_limit_conn_rbtree_insert_value(ngx_rbtree_node_t *temp, ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) { ngx_rbtree_node_t **p; ngx_stream_limit_conn_node_t *lcn, *lcnt; for ( ;; ) { if (node->key < temp->key) { p = &temp->left; } else if (node->key > temp->key) { p = &temp->right; } else { /* node->key == temp->key */ lcn = (ngx_stream_limit_conn_node_t *) &node->color; lcnt = (ngx_stream_limit_conn_node_t *) &temp->color; p = (ngx_memn2cmp(lcn->data, lcnt->data, lcn->len, lcnt->len) < 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); } static ngx_rbtree_node_t * ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_str_t *key, uint32_t hash) { ngx_int_t rc; ngx_rbtree_node_t *node, *sentinel; ngx_stream_limit_conn_node_t *lcn; node = rbtree->root; sentinel = rbtree->sentinel; while (node != sentinel) { if (hash < node->key) { node = node->left; continue; } if (hash > node->key) { node = node->right; continue; } /* hash == node->key */ lcn = (ngx_stream_limit_conn_node_t *) &node->color; rc = ngx_memn2cmp(key->data, lcn->data, key->len, (size_t) lcn->len); if (rc == 0) { return node; } node = (rc < 0) ? node->left : node->right; } return NULL; } static void ngx_stream_limit_conn_cleanup(void *data) { ngx_stream_limit_conn_cleanup_t *lccln = data; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *node; ngx_stream_limit_conn_ctx_t *ctx; ngx_stream_limit_conn_node_t *lc; ctx = lccln->shm_zone->data; shpool = (ngx_slab_pool_t *) lccln->shm_zone->shm.addr; node = lccln->node; lc = (ngx_stream_limit_conn_node_t *) &node->color; ngx_shmtx_lock(&shpool->mutex); ngx_log_debug2(NGX_LOG_DEBUG_STREAM, lccln->shm_zone->shm.log, 0, "limit conn cleanup: %08Xi %d", node->key, lc->conn); lc->conn--; if (lc->conn == 0) { ngx_rbtree_delete(ctx->rbtree, node); ngx_slab_free_locked(shpool, node); } ngx_shmtx_unlock(&shpool->mutex); } static ngx_inline void ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool) { ngx_pool_cleanup_t *cln; cln = pool->cleanup; while (cln && cln->handler == ngx_stream_limit_conn_cleanup) { ngx_stream_limit_conn_cleanup(cln->data); cln = cln->next; } pool->cleanup = cln; } static ngx_int_t ngx_stream_limit_conn_init_zone(ngx_shm_zone_t *shm_zone, void *data) { ngx_stream_limit_conn_ctx_t *octx = data; size_t len; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *sentinel; ngx_stream_limit_conn_ctx_t *ctx; ctx = shm_zone->data; if (octx) { if (ctx->key.value.len != octx->key.value.len || ngx_strncmp(ctx->key.value.data, octx->key.value.data, ctx->key.value.len) != 0) { ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, "limit_conn_zone \"%V\" uses the \"%V\" key " "while previously it used the \"%V\" key", &shm_zone->shm.name, &ctx->key.value, &octx->key.value); return NGX_ERROR; } ctx->rbtree = octx->rbtree; return NGX_OK; } shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; if (shm_zone->shm.exists) { ctx->rbtree = shpool->data; return NGX_OK; } ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); if (ctx->rbtree == NULL) { return NGX_ERROR; } shpool->data = ctx->rbtree; sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); if (sentinel == NULL) { return NGX_ERROR; } ngx_rbtree_init(ctx->rbtree, sentinel, ngx_stream_limit_conn_rbtree_insert_value); len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len; shpool->log_ctx = ngx_slab_alloc(shpool, len); if (shpool->log_ctx == NULL) { return NGX_ERROR; } ngx_sprintf(shpool->log_ctx, " in limit_conn_zone \"%V\"%Z", &shm_zone->shm.name); return NGX_OK; } static void * ngx_stream_limit_conn_create_conf(ngx_conf_t *cf) { ngx_stream_limit_conn_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_limit_conn_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->limits.elts = NULL; */ conf->log_level = NGX_CONF_UNSET_UINT; return conf; } static char * ngx_stream_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_stream_limit_conn_conf_t *prev = parent; ngx_stream_limit_conn_conf_t *conf = child; if (conf->limits.elts == NULL) { conf->limits = prev->limits; } ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); return NGX_CONF_OK; } static char * ngx_stream_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { u_char *p; ssize_t size; ngx_str_t *value, name, s; ngx_uint_t i; ngx_shm_zone_t *shm_zone; ngx_stream_limit_conn_ctx_t *ctx; ngx_stream_compile_complex_value_t ccv; value = cf->args->elts; ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_limit_conn_ctx_t)); if (ctx == NULL) { return NGX_CONF_ERROR; } ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[1]; ccv.complex_value = &ctx->key; if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } size = 0; name.len = 0; for (i = 2; i < cf->args->nelts; i++) { if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { name.data = value[i].data + 5; p = (u_char *) ngx_strchr(name.data, ':'); if (p == NULL) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid zone size \"%V\"", &value[i]); return NGX_CONF_ERROR; } name.len = p - name.data; s.data = p + 1; s.len = value[i].data + value[i].len - s.data; size = ngx_parse_size(&s); if (size == NGX_ERROR) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid zone size \"%V\"", &value[i]); return NGX_CONF_ERROR; } if (size < (ssize_t) (8 * ngx_pagesize)) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "zone \"%V\" is too small", &value[i]); return NGX_CONF_ERROR; } continue; } ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", &value[i]); return NGX_CONF_ERROR; } if (name.len == 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"%V\" must have \"zone\" parameter", &cmd->name); return NGX_CONF_ERROR; } shm_zone = ngx_shared_memory_add(cf, &name, size, &ngx_stream_limit_conn_module); if (shm_zone == NULL) { return NGX_CONF_ERROR; } if (shm_zone->data) { ctx = shm_zone->data; ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V \"%V\" is already bound to key \"%V\"", &cmd->name, &name, &ctx->key.value); return NGX_CONF_ERROR; } shm_zone->init = ngx_stream_limit_conn_init_zone; shm_zone->data = ctx; return NGX_CONF_OK; } static char * ngx_stream_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_shm_zone_t *shm_zone; ngx_stream_limit_conn_conf_t *lccf = conf; ngx_stream_limit_conn_limit_t *limit, *limits; ngx_str_t *value; ngx_int_t n; ngx_uint_t i; value = cf->args->elts; shm_zone = ngx_shared_memory_add(cf, &value[1], 0, &ngx_stream_limit_conn_module); if (shm_zone == NULL) { return NGX_CONF_ERROR; } limits = lccf->limits.elts; if (limits == NULL) { if (ngx_array_init(&lccf->limits, cf->pool, 1, sizeof(ngx_stream_limit_conn_limit_t)) != NGX_OK) { return NGX_CONF_ERROR; } } for (i = 0; i < lccf->limits.nelts; i++) { if (shm_zone == limits[i].shm_zone) { return "is duplicate"; } } n = ngx_atoi(value[2].data, value[2].len); if (n <= 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid number of connections \"%V\"", &value[2]); return NGX_CONF_ERROR; } if (n > 65535) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "connection limit must be less 65536"); return NGX_CONF_ERROR; } limit = ngx_array_push(&lccf->limits); if (limit == NULL) { return NGX_CONF_ERROR; } limit->conn = n; limit->shm_zone = shm_zone; return NGX_CONF_OK; } static ngx_int_t ngx_stream_limit_conn_init(ngx_conf_t *cf) { ngx_stream_handler_pt *h; ngx_stream_core_main_conf_t *cmcf; cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module); h = ngx_array_push(&cmcf->phases[NGX_STREAM_PREACCESS_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_stream_limit_conn_handler; return NGX_OK; }