Mercurial > hg > nginx-quic
view src/http/modules/ngx_http_limit_zone_module.c @ 4009:3183165283cc
Fixing proxy_set_body and proxy_pass_request_body with SSL.
Flush flag wasn't set in constructed buffer and this prevented any data
from being actually sent to upstream due to SSL buffering. Make sure
we always set flush in the last buffer we are going to sent.
See here for report:
http://nginx.org/pipermail/nginx-ru/2011-June/041552.html
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Thu, 18 Aug 2011 16:34:24 +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; }