Mercurial > hg > nginx
view src/http/modules/ngx_http_limit_zone_module.c @ 4253:6efec8b1ff52 stable-1.0
Merging r4193, r4194:
Autoindex fixes:
*) Autoindex: escape '?' in file names.
For files with '?' in their names autoindex generated links with '?' not
escaped. This resulted in effectively truncated links as '?' indicates
query string start.
This is an updated version of the patch originally posted at [1]. It
introduces generic NGX_ESCAPE_URI_COMPONENT which escapes everything but
unreserved characters as per RFC 3986. This approach also renders unneeded
special colon processing (as colon is percent-encoded now), it's dropped
accordingly.
[1] http://nginx.org/pipermail/nginx-devel/2010-February/000112.html
*) Autoindex: escape html in file names.
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 01 Nov 2011 14:09:15 +0000 |
parents | 23d567eabc5d |
children | 3544987fef85 97995d63aa36 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { u_char color; u_char len; u_short conn; u_char data[1]; } ngx_http_limit_zone_node_t; typedef struct { ngx_shm_zone_t *shm_zone; ngx_rbtree_node_t *node; } ngx_http_limit_zone_cleanup_t; typedef struct { ngx_rbtree_t *rbtree; ngx_int_t index; ngx_str_t var; } ngx_http_limit_zone_ctx_t; typedef struct { ngx_shm_zone_t *shm_zone; ngx_uint_t conn; ngx_uint_t log_level; } ngx_http_limit_zone_conf_t; static void ngx_http_limit_zone_cleanup(void *data); static void *ngx_http_limit_zone_create_conf(ngx_conf_t *cf); static char *ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf); static ngx_conf_enum_t ngx_http_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_http_limit_zone_commands[] = { { ngx_string("limit_zone"), NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, ngx_http_limit_zone, 0, 0, NULL }, { ngx_string("limit_conn"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, ngx_http_limit_conn, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("limit_conn_log_level"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_enum_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_limit_zone_conf_t, log_level), &ngx_http_limit_conn_log_levels }, ngx_null_command }; static ngx_http_module_t ngx_http_limit_zone_module_ctx = { NULL, /* preconfiguration */ ngx_http_limit_zone_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_limit_zone_create_conf, /* create location configration */ ngx_http_limit_zone_merge_conf /* merge location configration */ }; ngx_module_t ngx_http_limit_zone_module = { NGX_MODULE_V1, &ngx_http_limit_zone_module_ctx, /* module context */ ngx_http_limit_zone_commands, /* module directives */ NGX_HTTP_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_http_limit_zone_handler(ngx_http_request_t *r) { size_t len, n; uint32_t hash; ngx_int_t rc; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *node, *sentinel; ngx_pool_cleanup_t *cln; ngx_http_variable_value_t *vv; ngx_http_limit_zone_ctx_t *ctx; ngx_http_limit_zone_node_t *lz; ngx_http_limit_zone_conf_t *lzcf; ngx_http_limit_zone_cleanup_t *lzcln; if (r->main->limit_zone_set) { return NGX_DECLINED; } lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_zone_module); if (lzcf->shm_zone == NULL) { return NGX_DECLINED; } ctx = lzcf->shm_zone->data; vv = ngx_http_get_indexed_variable(r, ctx->index); if (vv == NULL || vv->not_found) { return NGX_DECLINED; } len = vv->len; if (len == 0) { return NGX_DECLINED; } 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); return NGX_DECLINED; } r->main->limit_zone_set = 1; hash = ngx_crc32_short(vv->data, len); cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t)); if (cln == NULL) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr; ngx_shmtx_lock(&shpool->mutex); node = ctx->rbtree->root; sentinel = ctx->rbtree->sentinel; while (node != sentinel) { if (hash < node->key) { node = node->left; continue; } if (hash > node->key) { node = node->right; continue; } /* hash == node->key */ do { lz = (ngx_http_limit_zone_node_t *) &node->color; rc = ngx_memn2cmp(vv->data, lz->data, len, (size_t) lz->len); if (rc == 0) { if ((ngx_uint_t) lz->conn < lzcf->conn) { lz->conn++; goto done; } ngx_shmtx_unlock(&shpool->mutex); ngx_log_error(lzcf->log_level, r->connection->log, 0, "limiting connections by zone \"%V\"", &lzcf->shm_zone->shm.name); return NGX_HTTP_SERVICE_UNAVAILABLE; } node = (rc < 0) ? node->left : node->right; } while (node != sentinel && hash == node->key); break; } n = offsetof(ngx_rbtree_node_t, color) + offsetof(ngx_http_limit_zone_node_t, data) + len; node = ngx_slab_alloc_locked(shpool, n); if (node == NULL) { ngx_shmtx_unlock(&shpool->mutex); return NGX_HTTP_SERVICE_UNAVAILABLE; } lz = (ngx_http_limit_zone_node_t *) &node->color; node->key = hash; lz->len = (u_char) len; lz->conn = 1; ngx_memcpy(lz->data, vv->data, len); ngx_rbtree_insert(ctx->rbtree, node); done: ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "limit zone: %08XD %d", node->key, lz->conn); ngx_shmtx_unlock(&shpool->mutex); cln->handler = ngx_http_limit_zone_cleanup; lzcln = cln->data; lzcln->shm_zone = lzcf->shm_zone; lzcln->node = node; return NGX_DECLINED; } static void ngx_http_limit_zone_rbtree_insert_value(ngx_rbtree_node_t *temp, ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) { ngx_rbtree_node_t **p; ngx_http_limit_zone_node_t *lzn, *lznt; for ( ;; ) { if (node->key < temp->key) { p = &temp->left; } else if (node->key > temp->key) { p = &temp->right; } else { /* node->key == temp->key */ lzn = (ngx_http_limit_zone_node_t *) &node->color; lznt = (ngx_http_limit_zone_node_t *) &temp->color; p = (ngx_memn2cmp(lzn->data, lznt->data, lzn->len, lznt->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 void ngx_http_limit_zone_cleanup(void *data) { ngx_http_limit_zone_cleanup_t *lzcln = data; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *node; ngx_http_limit_zone_ctx_t *ctx; ngx_http_limit_zone_node_t *lz; ctx = lzcln->shm_zone->data; shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; node = lzcln->node; lz = (ngx_http_limit_zone_node_t *) &node->color; ngx_shmtx_lock(&shpool->mutex); ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, "limit zone cleanup: %08XD %d", node->key, lz->conn); lz->conn--; if (lz->conn == 0) { ngx_rbtree_delete(ctx->rbtree, node); ngx_slab_free_locked(shpool, node); } ngx_shmtx_unlock(&shpool->mutex); } static ngx_int_t ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) { ngx_http_limit_zone_ctx_t *octx = data; size_t len; ngx_slab_pool_t *shpool; ngx_rbtree_node_t *sentinel; ngx_http_limit_zone_ctx_t *ctx; ctx = shm_zone->data; if (octx) { if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, "limit_zone \"%V\" uses the \"%V\" variable " "while previously it used the \"%V\" variable", &shm_zone->shm.name, &ctx->var, &octx->var); 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_http_limit_zone_rbtree_insert_value); len = sizeof(" in limit_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_zone \"%V\"%Z", &shm_zone->shm.name); return NGX_OK; } static void * ngx_http_limit_zone_create_conf(ngx_conf_t *cf) { ngx_http_limit_zone_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->shm_zone = NULL; * conf->conn = 0; */ conf->log_level = NGX_CONF_UNSET_UINT; return conf; } static char * ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_limit_zone_conf_t *prev = parent; ngx_http_limit_zone_conf_t *conf = child; if (conf->shm_zone == NULL) { *conf = *prev; } ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); return NGX_CONF_OK; } static char * ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ssize_t n; ngx_str_t *value; ngx_shm_zone_t *shm_zone; ngx_http_limit_zone_ctx_t *ctx; value = cf->args->elts; if (value[2].data[0] != '$') { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid variable name \"%V\"", &value[2]); return NGX_CONF_ERROR; } value[2].len--; value[2].data++; ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); if (ctx == NULL) { return NGX_CONF_ERROR; } ctx->index = ngx_http_get_variable_index(cf, &value[2]); if (ctx->index == NGX_ERROR) { return NGX_CONF_ERROR; } ctx->var = value[2]; n = ngx_parse_size(&value[3]); if (n == NGX_ERROR) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid size of limit_zone \"%V\"", &value[3]); return NGX_CONF_ERROR; } if (n < (ngx_int_t) (8 * ngx_pagesize)) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "limit_zone \"%V\" is too small", &value[1]); return NGX_CONF_ERROR; } shm_zone = ngx_shared_memory_add(cf, &value[1], n, &ngx_http_limit_zone_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, "limit_zone \"%V\" is already bound to variable \"%V\"", &value[1], &ctx->var); return NGX_CONF_ERROR; } shm_zone->init = ngx_http_limit_zone_init_zone; shm_zone->data = ctx; return NGX_CONF_OK; } static char * ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_limit_zone_conf_t *lzcf = conf; ngx_int_t n; ngx_str_t *value; if (lzcf->shm_zone) { return "is duplicate"; } value = cf->args->elts; lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, &ngx_http_limit_zone_module); if (lzcf->shm_zone == NULL) { return NGX_CONF_ERROR; } 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; } lzcf->conn = n; return NGX_CONF_OK; } static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf) { ngx_http_handler_pt *h; ngx_http_core_main_conf_t *cmcf; cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_http_limit_zone_handler; return NGX_OK; }