mirror of https://github.com/nginx/nginx
738 lines
20 KiB
C
738 lines
20 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_stream.h>
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#define NGX_STREAM_LIMIT_CONN_PASSED 1
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#define NGX_STREAM_LIMIT_CONN_REJECTED 2
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#define NGX_STREAM_LIMIT_CONN_REJECTED_DRY_RUN 3
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typedef struct {
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u_char color;
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u_char len;
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u_short conn;
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u_char data[1];
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} ngx_stream_limit_conn_node_t;
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typedef struct {
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ngx_shm_zone_t *shm_zone;
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ngx_rbtree_node_t *node;
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} ngx_stream_limit_conn_cleanup_t;
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typedef struct {
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ngx_rbtree_t rbtree;
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ngx_rbtree_node_t sentinel;
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} ngx_stream_limit_conn_shctx_t;
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typedef struct {
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ngx_stream_limit_conn_shctx_t *sh;
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ngx_slab_pool_t *shpool;
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ngx_stream_complex_value_t key;
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} ngx_stream_limit_conn_ctx_t;
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typedef struct {
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ngx_shm_zone_t *shm_zone;
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ngx_uint_t conn;
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} ngx_stream_limit_conn_limit_t;
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typedef struct {
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ngx_array_t limits;
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ngx_uint_t log_level;
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ngx_flag_t dry_run;
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} ngx_stream_limit_conn_conf_t;
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static ngx_rbtree_node_t *ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree,
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ngx_str_t *key, uint32_t hash);
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static void ngx_stream_limit_conn_cleanup(void *data);
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static ngx_inline void ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool);
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static ngx_int_t ngx_stream_limit_conn_status_variable(ngx_stream_session_t *s,
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ngx_stream_variable_value_t *v, uintptr_t data);
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static void *ngx_stream_limit_conn_create_conf(ngx_conf_t *cf);
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static char *ngx_stream_limit_conn_merge_conf(ngx_conf_t *cf, void *parent,
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void *child);
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static char *ngx_stream_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static char *ngx_stream_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static ngx_int_t ngx_stream_limit_conn_add_variables(ngx_conf_t *cf);
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static ngx_int_t ngx_stream_limit_conn_init(ngx_conf_t *cf);
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static ngx_conf_enum_t ngx_stream_limit_conn_log_levels[] = {
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{ ngx_string("info"), NGX_LOG_INFO },
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{ ngx_string("notice"), NGX_LOG_NOTICE },
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{ ngx_string("warn"), NGX_LOG_WARN },
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{ ngx_string("error"), NGX_LOG_ERR },
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{ ngx_null_string, 0 }
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};
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static ngx_command_t ngx_stream_limit_conn_commands[] = {
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{ ngx_string("limit_conn_zone"),
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NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE2,
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ngx_stream_limit_conn_zone,
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0,
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0,
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NULL },
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{ ngx_string("limit_conn"),
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NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE2,
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ngx_stream_limit_conn,
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NGX_STREAM_SRV_CONF_OFFSET,
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0,
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NULL },
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{ ngx_string("limit_conn_log_level"),
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NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_enum_slot,
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NGX_STREAM_SRV_CONF_OFFSET,
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offsetof(ngx_stream_limit_conn_conf_t, log_level),
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&ngx_stream_limit_conn_log_levels },
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{ ngx_string("limit_conn_dry_run"),
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NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG,
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ngx_conf_set_flag_slot,
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NGX_STREAM_SRV_CONF_OFFSET,
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offsetof(ngx_stream_limit_conn_conf_t, dry_run),
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NULL },
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ngx_null_command
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};
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static ngx_stream_module_t ngx_stream_limit_conn_module_ctx = {
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ngx_stream_limit_conn_add_variables, /* preconfiguration */
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ngx_stream_limit_conn_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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ngx_stream_limit_conn_create_conf, /* create server configuration */
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ngx_stream_limit_conn_merge_conf /* merge server configuration */
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};
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ngx_module_t ngx_stream_limit_conn_module = {
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NGX_MODULE_V1,
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&ngx_stream_limit_conn_module_ctx, /* module context */
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ngx_stream_limit_conn_commands, /* module directives */
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NGX_STREAM_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_stream_variable_t ngx_stream_limit_conn_vars[] = {
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{ ngx_string("limit_conn_status"), NULL,
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ngx_stream_limit_conn_status_variable, 0, NGX_STREAM_VAR_NOCACHEABLE, 0 },
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ngx_stream_null_variable
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};
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static ngx_str_t ngx_stream_limit_conn_status[] = {
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ngx_string("PASSED"),
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ngx_string("REJECTED"),
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ngx_string("REJECTED_DRY_RUN")
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};
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static ngx_int_t
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ngx_stream_limit_conn_handler(ngx_stream_session_t *s)
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{
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size_t n;
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uint32_t hash;
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ngx_str_t key;
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ngx_uint_t i;
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ngx_rbtree_node_t *node;
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ngx_pool_cleanup_t *cln;
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ngx_stream_limit_conn_ctx_t *ctx;
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ngx_stream_limit_conn_node_t *lc;
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ngx_stream_limit_conn_conf_t *lccf;
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ngx_stream_limit_conn_limit_t *limits;
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ngx_stream_limit_conn_cleanup_t *lccln;
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lccf = ngx_stream_get_module_srv_conf(s, ngx_stream_limit_conn_module);
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limits = lccf->limits.elts;
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for (i = 0; i < lccf->limits.nelts; i++) {
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ctx = limits[i].shm_zone->data;
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if (ngx_stream_complex_value(s, &ctx->key, &key) != NGX_OK) {
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return NGX_ERROR;
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}
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if (key.len == 0) {
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continue;
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}
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if (key.len > 255) {
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ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
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"the value of the \"%V\" key "
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"is more than 255 bytes: \"%V\"",
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&ctx->key.value, &key);
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continue;
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}
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s->limit_conn_status = NGX_STREAM_LIMIT_CONN_PASSED;
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hash = ngx_crc32_short(key.data, key.len);
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ngx_shmtx_lock(&ctx->shpool->mutex);
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node = ngx_stream_limit_conn_lookup(&ctx->sh->rbtree, &key, hash);
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if (node == NULL) {
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n = offsetof(ngx_rbtree_node_t, color)
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+ offsetof(ngx_stream_limit_conn_node_t, data)
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+ key.len;
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node = ngx_slab_alloc_locked(ctx->shpool, n);
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if (node == NULL) {
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ngx_shmtx_unlock(&ctx->shpool->mutex);
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ngx_stream_limit_conn_cleanup_all(s->connection->pool);
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if (lccf->dry_run) {
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s->limit_conn_status =
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NGX_STREAM_LIMIT_CONN_REJECTED_DRY_RUN;
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return NGX_DECLINED;
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}
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s->limit_conn_status = NGX_STREAM_LIMIT_CONN_REJECTED;
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return NGX_STREAM_SERVICE_UNAVAILABLE;
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}
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lc = (ngx_stream_limit_conn_node_t *) &node->color;
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node->key = hash;
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lc->len = (u_char) key.len;
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lc->conn = 1;
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ngx_memcpy(lc->data, key.data, key.len);
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ngx_rbtree_insert(&ctx->sh->rbtree, node);
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} else {
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lc = (ngx_stream_limit_conn_node_t *) &node->color;
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if ((ngx_uint_t) lc->conn >= limits[i].conn) {
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ngx_shmtx_unlock(&ctx->shpool->mutex);
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ngx_log_error(lccf->log_level, s->connection->log, 0,
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"limiting connections%s by zone \"%V\"",
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lccf->dry_run ? ", dry run," : "",
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&limits[i].shm_zone->shm.name);
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ngx_stream_limit_conn_cleanup_all(s->connection->pool);
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if (lccf->dry_run) {
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s->limit_conn_status =
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NGX_STREAM_LIMIT_CONN_REJECTED_DRY_RUN;
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return NGX_DECLINED;
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}
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s->limit_conn_status = NGX_STREAM_LIMIT_CONN_REJECTED;
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return NGX_STREAM_SERVICE_UNAVAILABLE;
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}
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lc->conn++;
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}
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ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
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"limit conn: %08Xi %d", node->key, lc->conn);
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ngx_shmtx_unlock(&ctx->shpool->mutex);
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cln = ngx_pool_cleanup_add(s->connection->pool,
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sizeof(ngx_stream_limit_conn_cleanup_t));
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if (cln == NULL) {
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return NGX_ERROR;
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}
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cln->handler = ngx_stream_limit_conn_cleanup;
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lccln = cln->data;
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lccln->shm_zone = limits[i].shm_zone;
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lccln->node = node;
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}
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return NGX_DECLINED;
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}
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static void
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ngx_stream_limit_conn_rbtree_insert_value(ngx_rbtree_node_t *temp,
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ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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{
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ngx_rbtree_node_t **p;
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ngx_stream_limit_conn_node_t *lcn, *lcnt;
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for ( ;; ) {
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if (node->key < temp->key) {
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p = &temp->left;
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} else if (node->key > temp->key) {
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p = &temp->right;
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} else { /* node->key == temp->key */
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lcn = (ngx_stream_limit_conn_node_t *) &node->color;
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lcnt = (ngx_stream_limit_conn_node_t *) &temp->color;
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p = (ngx_memn2cmp(lcn->data, lcnt->data, lcn->len, lcnt->len) < 0)
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? &temp->left : &temp->right;
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}
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if (*p == sentinel) {
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break;
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}
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temp = *p;
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}
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*p = node;
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node->parent = temp;
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node->left = sentinel;
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node->right = sentinel;
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ngx_rbt_red(node);
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}
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static ngx_rbtree_node_t *
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ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_str_t *key,
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uint32_t hash)
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{
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ngx_int_t rc;
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ngx_rbtree_node_t *node, *sentinel;
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ngx_stream_limit_conn_node_t *lcn;
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node = rbtree->root;
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sentinel = rbtree->sentinel;
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while (node != sentinel) {
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if (hash < node->key) {
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node = node->left;
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continue;
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}
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if (hash > node->key) {
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node = node->right;
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continue;
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}
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/* hash == node->key */
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lcn = (ngx_stream_limit_conn_node_t *) &node->color;
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rc = ngx_memn2cmp(key->data, lcn->data, key->len, (size_t) lcn->len);
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if (rc == 0) {
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return node;
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}
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node = (rc < 0) ? node->left : node->right;
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}
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return NULL;
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}
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static void
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ngx_stream_limit_conn_cleanup(void *data)
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{
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ngx_stream_limit_conn_cleanup_t *lccln = data;
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ngx_rbtree_node_t *node;
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ngx_stream_limit_conn_ctx_t *ctx;
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ngx_stream_limit_conn_node_t *lc;
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ctx = lccln->shm_zone->data;
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node = lccln->node;
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lc = (ngx_stream_limit_conn_node_t *) &node->color;
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ngx_shmtx_lock(&ctx->shpool->mutex);
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ngx_log_debug2(NGX_LOG_DEBUG_STREAM, lccln->shm_zone->shm.log, 0,
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"limit conn cleanup: %08Xi %d", node->key, lc->conn);
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lc->conn--;
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if (lc->conn == 0) {
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ngx_rbtree_delete(&ctx->sh->rbtree, node);
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ngx_slab_free_locked(ctx->shpool, node);
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}
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ngx_shmtx_unlock(&ctx->shpool->mutex);
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}
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static ngx_inline void
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ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool)
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{
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ngx_pool_cleanup_t *cln;
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cln = pool->cleanup;
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while (cln && cln->handler == ngx_stream_limit_conn_cleanup) {
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ngx_stream_limit_conn_cleanup(cln->data);
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cln = cln->next;
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}
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pool->cleanup = cln;
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}
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static ngx_int_t
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ngx_stream_limit_conn_init_zone(ngx_shm_zone_t *shm_zone, void *data)
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{
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ngx_stream_limit_conn_ctx_t *octx = data;
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size_t len;
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ngx_stream_limit_conn_ctx_t *ctx;
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ctx = shm_zone->data;
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if (octx) {
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if (ctx->key.value.len != octx->key.value.len
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|| ngx_strncmp(ctx->key.value.data, octx->key.value.data,
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ctx->key.value.len)
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!= 0)
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{
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ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
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"limit_conn_zone \"%V\" uses the \"%V\" key "
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"while previously it used the \"%V\" key",
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&shm_zone->shm.name, &ctx->key.value,
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&octx->key.value);
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return NGX_ERROR;
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}
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ctx->sh = octx->sh;
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ctx->shpool = octx->shpool;
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return NGX_OK;
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}
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ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
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if (shm_zone->shm.exists) {
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ctx->sh = ctx->shpool->data;
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return NGX_OK;
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}
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ctx->sh = ngx_slab_alloc(ctx->shpool,
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sizeof(ngx_stream_limit_conn_shctx_t));
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if (ctx->sh == NULL) {
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return NGX_ERROR;
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}
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ctx->shpool->data = ctx->sh;
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ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel,
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ngx_stream_limit_conn_rbtree_insert_value);
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len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len;
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ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len);
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if (ctx->shpool->log_ctx == NULL) {
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return NGX_ERROR;
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}
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ngx_sprintf(ctx->shpool->log_ctx, " in limit_conn_zone \"%V\"%Z",
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&shm_zone->shm.name);
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return NGX_OK;
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}
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static ngx_int_t
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ngx_stream_limit_conn_status_variable(ngx_stream_session_t *s,
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ngx_stream_variable_value_t *v, uintptr_t data)
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{
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if (s->limit_conn_status == 0) {
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v->not_found = 1;
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return NGX_OK;
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}
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v->valid = 1;
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v->no_cacheable = 0;
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v->not_found = 0;
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v->len = ngx_stream_limit_conn_status[s->limit_conn_status - 1].len;
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v->data = ngx_stream_limit_conn_status[s->limit_conn_status - 1].data;
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return NGX_OK;
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}
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static void *
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ngx_stream_limit_conn_create_conf(ngx_conf_t *cf)
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{
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ngx_stream_limit_conn_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_limit_conn_conf_t));
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if (conf == NULL) {
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return NULL;
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}
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/*
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* set by ngx_pcalloc():
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*
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* conf->limits.elts = NULL;
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*/
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|
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conf->log_level = NGX_CONF_UNSET_UINT;
|
|
conf->dry_run = NGX_CONF_UNSET;
|
|
|
|
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);
|
|
|
|
ngx_conf_merge_value(conf->dry_run, prev->dry_run, 0);
|
|
|
|
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_add_variables(ngx_conf_t *cf)
|
|
{
|
|
ngx_stream_variable_t *var, *v;
|
|
|
|
for (v = ngx_stream_limit_conn_vars; v->name.len; v++) {
|
|
var = ngx_stream_add_variable(cf, &v->name, v->flags);
|
|
if (var == NULL) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
var->get_handler = v->get_handler;
|
|
var->data = v->data;
|
|
}
|
|
|
|
return NGX_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;
|
|
}
|