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-rw-r--r--usr.sbin/nginx/src/http/modules/ngx_http_limit_req_module.c811
1 files changed, 811 insertions, 0 deletions
diff --git a/usr.sbin/nginx/src/http/modules/ngx_http_limit_req_module.c b/usr.sbin/nginx/src/http/modules/ngx_http_limit_req_module.c
new file mode 100644
index 00000000000..718fae8e2e2
--- /dev/null
+++ b/usr.sbin/nginx/src/http/modules/ngx_http_limit_req_module.c
@@ -0,0 +1,811 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+typedef struct {
+ u_char color;
+ u_char dummy;
+ u_short len;
+ ngx_queue_t queue;
+ ngx_msec_t last;
+ /* integer value, 1 corresponds to 0.001 r/s */
+ ngx_uint_t excess;
+ u_char data[1];
+} ngx_http_limit_req_node_t;
+
+
+typedef struct {
+ ngx_rbtree_t rbtree;
+ ngx_rbtree_node_t sentinel;
+ ngx_queue_t queue;
+} ngx_http_limit_req_shctx_t;
+
+
+typedef struct {
+ ngx_http_limit_req_shctx_t *sh;
+ ngx_slab_pool_t *shpool;
+ /* integer value, 1 corresponds to 0.001 r/s */
+ ngx_uint_t rate;
+ ngx_int_t index;
+ ngx_str_t var;
+} ngx_http_limit_req_ctx_t;
+
+
+typedef struct {
+ ngx_shm_zone_t *shm_zone;
+ /* integer value, 1 corresponds to 0.001 r/s */
+ ngx_uint_t burst;
+ ngx_uint_t limit_log_level;
+ ngx_uint_t delay_log_level;
+
+ ngx_uint_t nodelay; /* unsigned nodelay:1 */
+} ngx_http_limit_req_conf_t;
+
+
+static void ngx_http_limit_req_delay(ngx_http_request_t *r);
+static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf,
+ ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep);
+static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
+ ngx_uint_t n);
+
+static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
+static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
+ void *child);
+static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd,
+ void *conf);
+static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
+ void *conf);
+static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);
+
+
+static ngx_conf_enum_t ngx_http_limit_req_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_req_commands[] = {
+
+ { ngx_string("limit_req_zone"),
+ NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
+ ngx_http_limit_req_zone,
+ 0,
+ 0,
+ NULL },
+
+ { ngx_string("limit_req"),
+ NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
+ ngx_http_limit_req,
+ NGX_HTTP_LOC_CONF_OFFSET,
+ 0,
+ NULL },
+
+ { ngx_string("limit_req_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_req_conf_t, limit_log_level),
+ &ngx_http_limit_req_log_levels },
+
+ ngx_null_command
+};
+
+
+static ngx_http_module_t ngx_http_limit_req_module_ctx = {
+ NULL, /* preconfiguration */
+ ngx_http_limit_req_init, /* postconfiguration */
+
+ NULL, /* create main configuration */
+ NULL, /* init main configuration */
+
+ NULL, /* create server configuration */
+ NULL, /* merge server configuration */
+
+ ngx_http_limit_req_create_conf, /* create location configration */
+ ngx_http_limit_req_merge_conf /* merge location configration */
+};
+
+
+ngx_module_t ngx_http_limit_req_module = {
+ NGX_MODULE_V1,
+ &ngx_http_limit_req_module_ctx, /* module context */
+ ngx_http_limit_req_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_req_handler(ngx_http_request_t *r)
+{
+ size_t len, n;
+ uint32_t hash;
+ ngx_int_t rc;
+ ngx_uint_t excess;
+ ngx_time_t *tp;
+ ngx_rbtree_node_t *node;
+ ngx_http_variable_value_t *vv;
+ ngx_http_limit_req_ctx_t *ctx;
+ ngx_http_limit_req_node_t *lr;
+ ngx_http_limit_req_conf_t *lrcf;
+
+ if (r->main->limit_req_set) {
+ return NGX_DECLINED;
+ }
+
+ lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
+
+ if (lrcf->shm_zone == NULL) {
+ return NGX_DECLINED;
+ }
+
+ ctx = lrcf->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 > 65535) {
+ ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+ "the value of the \"%V\" variable "
+ "is more than 65535 bytes: \"%v\"",
+ &ctx->var, vv);
+ return NGX_DECLINED;
+ }
+
+ r->main->limit_req_set = 1;
+
+ hash = ngx_crc32_short(vv->data, len);
+
+ ngx_shmtx_lock(&ctx->shpool->mutex);
+
+ ngx_http_limit_req_expire(ctx, 1);
+
+ rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &excess);
+
+ ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+ "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000);
+
+ if (rc == NGX_DECLINED) {
+
+ n = offsetof(ngx_rbtree_node_t, color)
+ + offsetof(ngx_http_limit_req_node_t, data)
+ + len;
+
+ node = ngx_slab_alloc_locked(ctx->shpool, n);
+ if (node == NULL) {
+
+ ngx_http_limit_req_expire(ctx, 0);
+
+ node = ngx_slab_alloc_locked(ctx->shpool, n);
+ if (node == NULL) {
+ ngx_shmtx_unlock(&ctx->shpool->mutex);
+ return NGX_HTTP_SERVICE_UNAVAILABLE;
+ }
+ }
+
+ lr = (ngx_http_limit_req_node_t *) &node->color;
+
+ node->key = hash;
+ lr->len = (u_char) len;
+
+ tp = ngx_timeofday();
+ lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
+
+ lr->excess = 0;
+ ngx_memcpy(lr->data, vv->data, len);
+
+ ngx_rbtree_insert(&ctx->sh->rbtree, node);
+
+ ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
+
+ ngx_shmtx_unlock(&ctx->shpool->mutex);
+
+ return NGX_DECLINED;
+ }
+
+ ngx_shmtx_unlock(&ctx->shpool->mutex);
+
+ if (rc == NGX_OK) {
+ return NGX_DECLINED;
+ }
+
+ if (rc == NGX_BUSY) {
+ ngx_log_error(lrcf->limit_log_level, r->connection->log, 0,
+ "limiting requests, excess: %ui.%03ui by zone \"%V\"",
+ excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
+
+ return NGX_HTTP_SERVICE_UNAVAILABLE;
+ }
+
+ /* rc == NGX_AGAIN */
+
+ if (lrcf->nodelay) {
+ return NGX_DECLINED;
+ }
+
+ ngx_log_error(lrcf->delay_log_level, r->connection->log, 0,
+ "delaying request, excess: %ui.%03ui, by zone \"%V\"",
+ excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
+
+ if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
+ return NGX_HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ r->read_event_handler = ngx_http_test_reading;
+ r->write_event_handler = ngx_http_limit_req_delay;
+ ngx_add_timer(r->connection->write,
+ (ngx_msec_t) excess * 1000 / ctx->rate);
+
+ return NGX_AGAIN;
+}
+
+
+static void
+ngx_http_limit_req_delay(ngx_http_request_t *r)
+{
+ ngx_event_t *wev;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+ "limit_req delay");
+
+ wev = r->connection->write;
+
+ if (!wev->timedout) {
+
+ if (ngx_handle_write_event(wev, 0) != NGX_OK) {
+ ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+ }
+
+ return;
+ }
+
+ wev->timedout = 0;
+
+ if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
+ ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+ return;
+ }
+
+ r->read_event_handler = ngx_http_block_reading;
+ r->write_event_handler = ngx_http_core_run_phases;
+
+ ngx_http_core_run_phases(r);
+}
+
+
+static void
+ngx_http_limit_req_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_req_node_t *lrn, *lrnt;
+
+ for ( ;; ) {
+
+ if (node->key < temp->key) {
+
+ p = &temp->left;
+
+ } else if (node->key > temp->key) {
+
+ p = &temp->right;
+
+ } else { /* node->key == temp->key */
+
+ lrn = (ngx_http_limit_req_node_t *) &node->color;
+ lrnt = (ngx_http_limit_req_node_t *) &temp->color;
+
+ p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->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_int_t
+ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
+ u_char *data, size_t len, ngx_uint_t *ep)
+{
+ ngx_int_t rc, excess;
+ ngx_time_t *tp;
+ ngx_msec_t now;
+ ngx_msec_int_t ms;
+ ngx_rbtree_node_t *node, *sentinel;
+ ngx_http_limit_req_ctx_t *ctx;
+ ngx_http_limit_req_node_t *lr;
+
+ ctx = lrcf->shm_zone->data;
+
+ node = ctx->sh->rbtree.root;
+ sentinel = ctx->sh->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 {
+ lr = (ngx_http_limit_req_node_t *) &node->color;
+
+ rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len);
+
+ if (rc == 0) {
+ ngx_queue_remove(&lr->queue);
+ ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
+
+ tp = ngx_timeofday();
+
+ now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
+ ms = (ngx_msec_int_t) (now - lr->last);
+
+ excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
+
+ if (excess < 0) {
+ excess = 0;
+ }
+
+ *ep = excess;
+
+ if ((ngx_uint_t) excess > lrcf->burst) {
+ return NGX_BUSY;
+ }
+
+ lr->excess = excess;
+ lr->last = now;
+
+ if (excess) {
+ return NGX_AGAIN;
+ }
+
+ return NGX_OK;
+ }
+
+ node = (rc < 0) ? node->left : node->right;
+
+ } while (node != sentinel && hash == node->key);
+
+ break;
+ }
+
+ *ep = 0;
+
+ return NGX_DECLINED;
+}
+
+
+static void
+ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
+{
+ ngx_int_t excess;
+ ngx_time_t *tp;
+ ngx_msec_t now;
+ ngx_queue_t *q;
+ ngx_msec_int_t ms;
+ ngx_rbtree_node_t *node;
+ ngx_http_limit_req_node_t *lr;
+
+ tp = ngx_timeofday();
+
+ now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
+
+ /*
+ * n == 1 deletes one or two zero rate entries
+ * n == 0 deletes oldest entry by force
+ * and one or two zero rate entries
+ */
+
+ while (n < 3) {
+
+ if (ngx_queue_empty(&ctx->sh->queue)) {
+ return;
+ }
+
+ q = ngx_queue_last(&ctx->sh->queue);
+
+ lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
+
+ if (n++ != 0) {
+
+ ms = (ngx_msec_int_t) (now - lr->last);
+ ms = ngx_abs(ms);
+
+ if (ms < 60000) {
+ return;
+ }
+
+ excess = lr->excess - ctx->rate * ms / 1000;
+
+ if (excess > 0) {
+ return;
+ }
+ }
+
+ ngx_queue_remove(q);
+
+ node = (ngx_rbtree_node_t *)
+ ((u_char *) lr - offsetof(ngx_rbtree_node_t, color));
+
+ ngx_rbtree_delete(&ctx->sh->rbtree, node);
+
+ ngx_slab_free_locked(ctx->shpool, node);
+ }
+}
+
+
+static ngx_int_t
+ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
+{
+ ngx_http_limit_req_ctx_t *octx = data;
+
+ size_t len;
+ ngx_http_limit_req_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_req \"%V\" uses the \"%V\" variable "
+ "while previously it used the \"%V\" variable",
+ &shm_zone->shm.name, &ctx->var, &octx->var);
+ return NGX_ERROR;
+ }
+
+ ctx->sh = octx->sh;
+ ctx->shpool = octx->shpool;
+
+ return NGX_OK;
+ }
+
+ ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
+
+ if (shm_zone->shm.exists) {
+ ctx->sh = ctx->shpool->data;
+
+ return NGX_OK;
+ }
+
+ ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t));
+ if (ctx->sh == NULL) {
+ return NGX_ERROR;
+ }
+
+ ctx->shpool->data = ctx->sh;
+
+ ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel,
+ ngx_http_limit_req_rbtree_insert_value);
+
+ ngx_queue_init(&ctx->sh->queue);
+
+ len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len;
+
+ ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len);
+ if (ctx->shpool->log_ctx == NULL) {
+ return NGX_ERROR;
+ }
+
+ ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z",
+ &shm_zone->shm.name);
+
+ return NGX_OK;
+}
+
+
+static void *
+ngx_http_limit_req_create_conf(ngx_conf_t *cf)
+{
+ ngx_http_limit_req_conf_t *conf;
+
+ conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
+ if (conf == NULL) {
+ return NULL;
+ }
+
+ /*
+ * set by ngx_pcalloc():
+ *
+ * conf->shm_zone = NULL;
+ * conf->burst = 0;
+ * conf->nodelay = 0;
+ */
+
+ conf->limit_log_level = NGX_CONF_UNSET_UINT;
+
+ return conf;
+}
+
+
+static char *
+ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+ ngx_http_limit_req_conf_t *prev = parent;
+ ngx_http_limit_req_conf_t *conf = child;
+
+ if (conf->shm_zone == NULL) {
+ *conf = *prev;
+ }
+
+ ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level,
+ NGX_LOG_ERR);
+
+ conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ?
+ NGX_LOG_INFO : conf->limit_log_level + 1;
+
+ return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+ u_char *p;
+ size_t size, len;
+ ngx_str_t *value, name, s;
+ ngx_int_t rate, scale;
+ ngx_uint_t i;
+ ngx_shm_zone_t *shm_zone;
+ ngx_http_limit_req_ctx_t *ctx;
+
+ value = cf->args->elts;
+
+ ctx = NULL;
+ size = 0;
+ rate = 1;
+ scale = 1;
+ name.len = 0;
+
+ for (i = 1; 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) {
+ *p = '\0';
+
+ name.len = p - name.data;
+
+ p++;
+
+ s.len = value[i].data + value[i].len - p;
+ s.data = p;
+
+ size = ngx_parse_size(&s);
+ if (size > 8191) {
+ continue;
+ }
+ }
+
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid zone size \"%V\"", &value[i]);
+ return NGX_CONF_ERROR;
+ }
+
+ if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
+
+ len = value[i].len;
+ p = value[i].data + len - 3;
+
+ if (ngx_strncmp(p, "r/s", 3) == 0) {
+ scale = 1;
+ len -= 3;
+
+ } else if (ngx_strncmp(p, "r/m", 3) == 0) {
+ scale = 60;
+ len -= 3;
+ }
+
+ rate = ngx_atoi(value[i].data + 5, len - 5);
+ if (rate <= NGX_ERROR) {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid rate \"%V\"", &value[i]);
+ return NGX_CONF_ERROR;
+ }
+
+ continue;
+ }
+
+ if (value[i].data[0] == '$') {
+
+ value[i].len--;
+ value[i].data++;
+
+ ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
+ if (ctx == NULL) {
+ return NGX_CONF_ERROR;
+ }
+
+ ctx->index = ngx_http_get_variable_index(cf, &value[i]);
+ if (ctx->index == NGX_ERROR) {
+ return NGX_CONF_ERROR;
+ }
+
+ ctx->var = value[i];
+
+ continue;
+ }
+
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid parameter \"%V\"", &value[i]);
+ return NGX_CONF_ERROR;
+ }
+
+ if (name.len == 0 || size == 0) {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "\"%V\" must have \"zone\" parameter",
+ &cmd->name);
+ return NGX_CONF_ERROR;
+ }
+
+ if (ctx == NULL) {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "no variable is defined for limit_req_zone \"%V\"",
+ &cmd->name);
+ return NGX_CONF_ERROR;
+ }
+
+ ctx->rate = rate * 1000 / scale;
+
+ shm_zone = ngx_shared_memory_add(cf, &name, size,
+ &ngx_http_limit_req_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_req_zone \"%V\" is already bound to variable \"%V\"",
+ &value[1], &ctx->var);
+ return NGX_CONF_ERROR;
+ }
+
+ shm_zone->init = ngx_http_limit_req_init_zone;
+ shm_zone->data = ctx;
+
+ return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+ ngx_http_limit_req_conf_t *lrcf = conf;
+
+ ngx_int_t burst;
+ ngx_str_t *value, s;
+ ngx_uint_t i;
+
+ if (lrcf->shm_zone) {
+ return "is duplicate";
+ }
+
+ value = cf->args->elts;
+
+ burst = 0;
+
+ for (i = 1; i < cf->args->nelts; i++) {
+
+ if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
+
+ s.len = value[i].len - 5;
+ s.data = value[i].data + 5;
+
+ lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
+ &ngx_http_limit_req_module);
+ if (lrcf->shm_zone == NULL) {
+ return NGX_CONF_ERROR;
+ }
+
+ continue;
+ }
+
+ if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
+
+ burst = ngx_atoi(value[i].data + 6, value[i].len - 6);
+ if (burst <= 0) {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid burst rate \"%V\"", &value[i]);
+ return NGX_CONF_ERROR;
+ }
+
+ continue;
+ }
+
+ if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
+ lrcf->nodelay = 1;
+ continue;
+ }
+
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid parameter \"%V\"", &value[i]);
+ return NGX_CONF_ERROR;
+ }
+
+ if (lrcf->shm_zone == NULL) {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "\"%V\" must have \"zone\" parameter",
+ &cmd->name);
+ return NGX_CONF_ERROR;
+ }
+
+ if (lrcf->shm_zone->data == NULL) {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "unknown limit_req_zone \"%V\"",
+ &lrcf->shm_zone->shm.name);
+ return NGX_CONF_ERROR;
+ }
+
+ lrcf->burst = burst * 1000;
+
+ return NGX_CONF_OK;
+}
+
+
+static ngx_int_t
+ngx_http_limit_req_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_req_handler;
+
+ return NGX_OK;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.