text: /* Copyright 2015 greenbytes GmbH (https://www.greenbytes.de)
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <assert.h>
  
  #include <apr_hash.h>
  #include <apr_lib.h>
  
  #include <httpd.h>
  #include <http_core.h>
  #include <http_config.h>
  #include <http_log.h>
  #include <http_vhost.h>
  
  #include <ap_mpm.h>
  
  #include <apr_strings.h>
  
  #include "h2.h"
  #include "h2_alt_svc.h"
  #include "h2_ctx.h"
  #include "h2_conn.h"
  #include "h2_config.h"
  #include "h2_h2.h"
  #include "h2_private.h"
  
  #define DEF_VAL     (-1)
  
  #define H2_CONFIG_GET(a, b, n) \
      (((a)->n == DEF_VAL)? (b) : (a))->n
  
  static h2_config defconf = {
      "default",
      100,                    /* max_streams */
      H2_INITIAL_WINDOW_SIZE, /* window_size */
      -1,                     /* min workers */
      -1,                     /* max workers */
      10 * 60,                /* max workers idle secs */
      32 * 1024,              /* stream max mem size */
      NULL,                   /* no alt-svcs */
      -1,                     /* alt-svc max age */
      0,                      /* serialize headers */
      -1,                     /* h2 direct mode */
      1,                      /* modern TLS only */
      -1,                     /* HTTP/1 Upgrade support */
      1024*1024,              /* TLS warmup size */
      1,                      /* TLS cooldown secs */
      1,                      /* HTTP/2 server push enabled */
      NULL,                   /* map of content-type to priorities */
      256,                    /* push diary size */
      0,                      /* copy files across threads */
      NULL,                   /* push list */
      0,                      /* early hints, http status 103 */
  };
  
  void h2_config_init(apr_pool_t *pool)
  {
      (void)pool;
  }
  
  static void *h2_config_create(apr_pool_t *pool,
                                const char *prefix, const char *x)
  {
      h2_config *conf = (h2_config *)apr_pcalloc(pool, sizeof(h2_config));
      const char *s = x? x : "unknown";
      char *name = apr_pstrcat(pool, prefix, "[", s, "]", NULL);
      
      conf->name                 = name;
      conf->h2_max_streams       = DEF_VAL;
      conf->h2_window_size       = DEF_VAL;
      conf->min_workers          = DEF_VAL;
      conf->max_workers          = DEF_VAL;
      conf->max_worker_idle_secs = DEF_VAL;
      conf->stream_max_mem_size  = DEF_VAL;
      conf->alt_svc_max_age      = DEF_VAL;
      conf->serialize_headers    = DEF_VAL;
      conf->h2_direct            = DEF_VAL;
      conf->modern_tls_only      = DEF_VAL;
      conf->h2_upgrade           = DEF_VAL;
      conf->tls_warmup_size      = DEF_VAL;
      conf->tls_cooldown_secs    = DEF_VAL;
      conf->h2_push              = DEF_VAL;
      conf->priorities           = NULL;
      conf->push_diary_size      = DEF_VAL;
      conf->copy_files           = DEF_VAL;
      conf->push_list            = NULL;
      conf->early_hints          = DEF_VAL;
      return conf;
  }
  
  void *h2_config_create_svr(apr_pool_t *pool, server_rec *s)
  {
      return h2_config_create(pool, "srv", s->defn_name);
  }
  
  void *h2_config_create_dir(apr_pool_t *pool, char *x)
  {
      return h2_config_create(pool, "dir", x);
  }
  
  static void *h2_config_merge(apr_pool_t *pool, void *basev, void *addv)
  {
      h2_config *base = (h2_config *)basev;
      h2_config *add = (h2_config *)addv;
      h2_config *n = (h2_config *)apr_pcalloc(pool, sizeof(h2_config));
      char *name = apr_pstrcat(pool, "merged[", add->name, ", ", base->name, "]", NULL);
      n->name = name;
  
      n->h2_max_streams       = H2_CONFIG_GET(add, base, h2_max_streams);
      n->h2_window_size       = H2_CONFIG_GET(add, base, h2_window_size);
      n->min_workers          = H2_CONFIG_GET(add, base, min_workers);
      n->max_workers          = H2_CONFIG_GET(add, base, max_workers);
      n->max_worker_idle_secs = H2_CONFIG_GET(add, base, max_worker_idle_secs);
      n->stream_max_mem_size  = H2_CONFIG_GET(add, base, stream_max_mem_size);
      n->alt_svcs             = add->alt_svcs? add->alt_svcs : base->alt_svcs;
      n->alt_svc_max_age      = H2_CONFIG_GET(add, base, alt_svc_max_age);
      n->serialize_headers    = H2_CONFIG_GET(add, base, serialize_headers);
      n->h2_direct            = H2_CONFIG_GET(add, base, h2_direct);
      n->modern_tls_only      = H2_CONFIG_GET(add, base, modern_tls_only);
      n->h2_upgrade           = H2_CONFIG_GET(add, base, h2_upgrade);
      n->tls_warmup_size      = H2_CONFIG_GET(add, base, tls_warmup_size);
      n->tls_cooldown_secs    = H2_CONFIG_GET(add, base, tls_cooldown_secs);
      n->h2_push              = H2_CONFIG_GET(add, base, h2_push);
      if (add->priorities && base->priorities) {
          n->priorities       = apr_hash_overlay(pool, add->priorities, base->priorities);
      }
      else {
          n->priorities       = add->priorities? add->priorities : base->priorities;
      }
      n->push_diary_size      = H2_CONFIG_GET(add, base, push_diary_size);
      n->copy_files           = H2_CONFIG_GET(add, base, copy_files);
      if (add->push_list && base->push_list) {
          n->push_list        = apr_array_append(pool, base->push_list, add->push_list);
      }
      else {
          n->push_list        = add->push_list? add->push_list : base->push_list;
      }
      n->early_hints          = H2_CONFIG_GET(add, base, early_hints);
      return n;
  }
  
  void *h2_config_merge_dir(apr_pool_t *pool, void *basev, void *addv)
  {
      return h2_config_merge(pool, basev, addv);
  }
  
  void *h2_config_merge_svr(apr_pool_t *pool, void *basev, void *addv)
  {
      return h2_config_merge(pool, basev, addv);
  }
  
  int h2_config_geti(const h2_config *conf, h2_config_var_t var)
  {
      return (int)h2_config_geti64(conf, var);
  }
  
  apr_int64_t h2_config_geti64(const h2_config *conf, h2_config_var_t var)
  {
      switch(var) {
          case H2_CONF_MAX_STREAMS:
              return H2_CONFIG_GET(conf, &defconf, h2_max_streams);
          case H2_CONF_WIN_SIZE:
              return H2_CONFIG_GET(conf, &defconf, h2_window_size);
          case H2_CONF_MIN_WORKERS:
              return H2_CONFIG_GET(conf, &defconf, min_workers);
          case H2_CONF_MAX_WORKERS:
              return H2_CONFIG_GET(conf, &defconf, max_workers);
          case H2_CONF_MAX_WORKER_IDLE_SECS:
              return H2_CONFIG_GET(conf, &defconf, max_worker_idle_secs);
          case H2_CONF_STREAM_MAX_MEM:
              return H2_CONFIG_GET(conf, &defconf, stream_max_mem_size);
          case H2_CONF_ALT_SVC_MAX_AGE:
              return H2_CONFIG_GET(conf, &defconf, alt_svc_max_age);
          case H2_CONF_SER_HEADERS:
              return H2_CONFIG_GET(conf, &defconf, serialize_headers);
          case H2_CONF_MODERN_TLS_ONLY:
              return H2_CONFIG_GET(conf, &defconf, modern_tls_only);
          case H2_CONF_UPGRADE:
              return H2_CONFIG_GET(conf, &defconf, h2_upgrade);
          case H2_CONF_DIRECT:
              return H2_CONFIG_GET(conf, &defconf, h2_direct);
          case H2_CONF_TLS_WARMUP_SIZE:
              return H2_CONFIG_GET(conf, &defconf, tls_warmup_size);
          case H2_CONF_TLS_COOLDOWN_SECS:
              return H2_CONFIG_GET(conf, &defconf, tls_cooldown_secs);
          case H2_CONF_PUSH:
              return H2_CONFIG_GET(conf, &defconf, h2_push);
          case H2_CONF_PUSH_DIARY_SIZE:
              return H2_CONFIG_GET(conf, &defconf, push_diary_size);
          case H2_CONF_COPY_FILES:
              return H2_CONFIG_GET(conf, &defconf, copy_files);
          case H2_CONF_EARLY_HINTS:
              return H2_CONFIG_GET(conf, &defconf, early_hints);
          default:
              return DEF_VAL;
      }
  }
  
  const h2_config *h2_config_sget(server_rec *s)
  {
      h2_config *cfg = (h2_config *)ap_get_module_config(s->module_config, 
                                                         &http2_module);
      ap_assert(cfg);
      return cfg;
  }
  
  const struct h2_priority *h2_config_get_priority(const h2_config *conf, 
                                                   const char *content_type)
  {
      if (content_type && conf->priorities) {
          size_t len = strcspn(content_type, "; \t");
          h2_priority *prio = apr_hash_get(conf->priorities, content_type, len);
          return prio? prio : apr_hash_get(conf->priorities, "*", 1);
      }
      return NULL;
  }
  
  static const char *h2_conf_set_max_streams(cmd_parms *parms,
                                             void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->h2_max_streams = (int)apr_atoi64(value);
      (void)arg;
      if (cfg->h2_max_streams < 1) {
          return "value must be > 0";
      }
      return NULL;
  }
  
  static const char *h2_conf_set_window_size(cmd_parms *parms,
                                             void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->h2_window_size = (int)apr_atoi64(value);
      (void)arg;
      if (cfg->h2_window_size < 1024) {
          return "value must be >= 1024";
      }
      return NULL;
  }
  
  static const char *h2_conf_set_min_workers(cmd_parms *parms,
                                             void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->min_workers = (int)apr_atoi64(value);
      (void)arg;
      if (cfg->min_workers < 1) {
          return "value must be > 0";
      }
      return NULL;
  }
  
  static const char *h2_conf_set_max_workers(cmd_parms *parms,
                                             void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->max_workers = (int)apr_atoi64(value);
      (void)arg;
      if (cfg->max_workers < 1) {
          return "value must be > 0";
      }
      return NULL;
  }
  
  static const char *h2_conf_set_max_worker_idle_secs(cmd_parms *parms,
                                                      void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->max_worker_idle_secs = (int)apr_atoi64(value);
      (void)arg;
      if (cfg->max_worker_idle_secs < 1) {
          return "value must be > 0";
      }
      return NULL;
  }
  
  static const char *h2_conf_set_stream_max_mem_size(cmd_parms *parms,
                                                     void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      
      
      cfg->stream_max_mem_size = (int)apr_atoi64(value);
      (void)arg;
      if (cfg->stream_max_mem_size < 1024) {
          return "value must be >= 1024";
      }
      return NULL;
  }
  
  static const char *h2_add_alt_svc(cmd_parms *parms,
                                    void *arg, const char *value)
  {
      if (value && *value) {
          h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
          h2_alt_svc *as = h2_alt_svc_parse(value, parms->pool);
          if (!as) {
              return "unable to parse alt-svc specifier";
          }
          if (!cfg->alt_svcs) {
              cfg->alt_svcs = apr_array_make(parms->pool, 5, sizeof(h2_alt_svc*));
          }
          APR_ARRAY_PUSH(cfg->alt_svcs, h2_alt_svc*) = as;
      }
      (void)arg;
      return NULL;
  }
  
  static const char *h2_conf_set_alt_svc_max_age(cmd_parms *parms,
                                                 void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->alt_svc_max_age = (int)apr_atoi64(value);
      (void)arg;
      return NULL;
  }
  
  static const char *h2_conf_set_session_extra_files(cmd_parms *parms,
                                                     void *arg, const char *value)
  {
      /* deprecated, ignore */
      (void)arg;
      (void)value;
      ap_log_perror(APLOG_MARK, APLOG_WARNING, 0, parms->pool, /* NO LOGNO */
                    "H2SessionExtraFiles is obsolete and will be ignored");
      return NULL;
  }
  
  static const char *h2_conf_set_serialize_headers(cmd_parms *parms,
                                                   void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      if (!strcasecmp(value, "On")) {
          cfg->serialize_headers = 1;
          return NULL;
      }
      else if (!strcasecmp(value, "Off")) {
          cfg->serialize_headers = 0;
          return NULL;
      }
      
      (void)arg;
      return "value must be On or Off";
  }
  
  static const char *h2_conf_set_direct(cmd_parms *parms,
                                        void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      if (!strcasecmp(value, "On")) {
          cfg->h2_direct = 1;
          return NULL;
      }
      else if (!strcasecmp(value, "Off")) {
          cfg->h2_direct = 0;
          return NULL;
      }
      
      (void)arg;
      return "value must be On or Off";
  }
  
  static const char *h2_conf_set_push(cmd_parms *parms,
                                      void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      if (!strcasecmp(value, "On")) {
          cfg->h2_push = 1;
          return NULL;
      }
      else if (!strcasecmp(value, "Off")) {
          cfg->h2_push = 0;
          return NULL;
      }
      
      (void)arg;
      return "value must be On or Off";
  }
  
  static const char *h2_conf_add_push_priority(cmd_parms *cmd, void *_cfg,
                                               const char *ctype, const char *sdependency,
                                               const char *sweight)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(cmd->server);
      const char *sdefweight = "16";         /* default AFTER weight */
      h2_dependency dependency;
      h2_priority *priority;
      int weight;
      
      if (!*ctype) {
          return "1st argument must be a mime-type, like 'text/css' or '*'";
      }
      
      if (!sweight) {
          /* 2 args only, but which one? */
          if (apr_isdigit(sdependency[0])) {
              sweight = sdependency;
              sdependency = "AFTER";        /* default dependency */
          }
      }
      
      if (!strcasecmp("AFTER", sdependency)) {
          dependency = H2_DEPENDANT_AFTER;
      } 
      else if (!strcasecmp("BEFORE", sdependency)) {
          dependency = H2_DEPENDANT_BEFORE;
          if (sweight) {
              return "dependecy 'Before' does not allow a weight";
          }
      } 
      else if (!strcasecmp("INTERLEAVED", sdependency)) {
          dependency = H2_DEPENDANT_INTERLEAVED;
          sdefweight = "256";        /* default INTERLEAVED weight */
      }
      else {
          return "dependency must be one of 'After', 'Before' or 'Interleaved'";
      }
      
      weight = (int)apr_atoi64(sweight? sweight : sdefweight);
      if (weight < NGHTTP2_MIN_WEIGHT) {
          return apr_psprintf(cmd->pool, "weight must be a number >= %d",
                              NGHTTP2_MIN_WEIGHT);
      }
      
      priority = apr_pcalloc(cmd->pool, sizeof(*priority));
      priority->dependency = dependency;
      priority->weight = weight;
      
      if (!cfg->priorities) {
          cfg->priorities = apr_hash_make(cmd->pool);
      }
      apr_hash_set(cfg->priorities, ctype, strlen(ctype), priority);
      return NULL;
  }
  
  static const char *h2_conf_set_modern_tls_only(cmd_parms *parms,
                                                 void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      if (!strcasecmp(value, "On")) {
          cfg->modern_tls_only = 1;
          return NULL;
      }
      else if (!strcasecmp(value, "Off")) {
          cfg->modern_tls_only = 0;
          return NULL;
      }
      
      (void)arg;
      return "value must be On or Off";
  }
  
  static const char *h2_conf_set_upgrade(cmd_parms *parms,
                                         void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      if (!strcasecmp(value, "On")) {
          cfg->h2_upgrade = 1;
          return NULL;
      }
      else if (!strcasecmp(value, "Off")) {
          cfg->h2_upgrade = 0;
          return NULL;
      }
      
      (void)arg;
      return "value must be On or Off";
  }
  
  static const char *h2_conf_set_tls_warmup_size(cmd_parms *parms,
                                                 void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->tls_warmup_size = apr_atoi64(value);
      (void)arg;
      return NULL;
  }
  
  static const char *h2_conf_set_tls_cooldown_secs(cmd_parms *parms,
                                                   void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      cfg->tls_cooldown_secs = (int)apr_atoi64(value);
      (void)arg;
      return NULL;
  }
  
  static const char *h2_conf_set_push_diary_size(cmd_parms *parms,
                                                 void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      (void)arg;
      cfg->push_diary_size = (int)apr_atoi64(value);
      if (cfg->push_diary_size < 0) {
          return "value must be >= 0";
      }
      if (cfg->push_diary_size > 0 && (cfg->push_diary_size & (cfg->push_diary_size-1))) {
          return "value must a power of 2";
      }
      if (cfg->push_diary_size > (1 << 15)) {
          return "value must <= 65536";
      }
      return NULL;
  }
  
  static const char *h2_conf_set_copy_files(cmd_parms *parms,
                                            void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)arg;
      if (!strcasecmp(value, "On")) {
          cfg->copy_files = 1;
          return NULL;
      }
      else if (!strcasecmp(value, "Off")) {
          cfg->copy_files = 0;
          return NULL;
      }
      
      (void)arg;
      return "value must be On or Off";
  }
  
  static void add_push(apr_pool_t *pool, h2_config *conf, h2_push_res *push)
  {
      h2_push_res *new;
      if (!conf->push_list) {
          conf->push_list = apr_array_make(pool, 10, sizeof(*push));
      }
      new = apr_array_push(conf->push_list);
      new->uri_ref = push->uri_ref;
      new->critical = push->critical;
  }
  
  static const char *h2_conf_add_push_res(cmd_parms *cmd, void *dirconf,
                                          const char *arg1, const char *arg2,
                                          const char *arg3)
  {
      h2_config *dconf = (h2_config*)dirconf ;
      h2_config *sconf = (h2_config*)h2_config_sget(cmd->server);
      h2_push_res push;
      const char *last = arg3;
      
      memset(&push, 0, sizeof(push));
      if (!strcasecmp("add", arg1)) {
          push.uri_ref = arg2;
      }
      else {
          push.uri_ref = arg1;
          last = arg2;
          if (arg3) {
              return "too many parameter";
          }
      }
      
      if (last) {
          if (!strcasecmp("critical", last)) {
              push.critical = 1;
          }
          else {
              return "unknown last parameter";
          }
      }
  
      /* server command? set both */
      if (cmd->path == NULL) {
          add_push(cmd->pool, sconf, &push);
          add_push(cmd->pool, dconf, &push);
      }
      else {
          add_push(cmd->pool, dconf, &push);
      }
  
      return NULL;
  }
  
  static const char *h2_conf_set_early_hints(cmd_parms *parms,
                                             void *arg, const char *value)
  {
      h2_config *cfg = (h2_config *)h2_config_sget(parms->server);
      if (!strcasecmp(value, "On")) {
          cfg->early_hints = 1;
          return NULL;
      }
      else if (!strcasecmp(value, "Off")) {
          cfg->early_hints = 0;
          return NULL;
      }
      
      (void)arg;
      return "value must be On or Off";
  }
  
  #define AP_END_CMD     AP_INIT_TAKE1(NULL, NULL, NULL, RSRC_CONF, NULL)
  
  const command_rec h2_cmds[] = {
      AP_INIT_TAKE1("H2MaxSessionStreams", h2_conf_set_max_streams, NULL,
                    RSRC_CONF, "maximum number of open streams per session"),
      AP_INIT_TAKE1("H2WindowSize", h2_conf_set_window_size, NULL,
                    RSRC_CONF, "window size on client DATA"),
      AP_INIT_TAKE1("H2MinWorkers", h2_conf_set_min_workers, NULL,
                    RSRC_CONF, "minimum number of worker threads per child"),
      AP_INIT_TAKE1("H2MaxWorkers", h2_conf_set_max_workers, NULL,
                    RSRC_CONF, "maximum number of worker threads per child"),
      AP_INIT_TAKE1("H2MaxWorkerIdleSeconds", h2_conf_set_max_worker_idle_secs, NULL,
                    RSRC_CONF, "maximum number of idle seconds before a worker shuts down"),
      AP_INIT_TAKE1("H2StreamMaxMemSize", h2_conf_set_stream_max_mem_size, NULL,
                    RSRC_CONF, "maximum number of bytes buffered in memory for a stream"),
      AP_INIT_TAKE1("H2AltSvc", h2_add_alt_svc, NULL,
                    RSRC_CONF, "adds an Alt-Svc for this server"),
      AP_INIT_TAKE1("H2AltSvcMaxAge", h2_conf_set_alt_svc_max_age, NULL,
                    RSRC_CONF, "set the maximum age (in seconds) that client can rely on alt-svc information"),
      AP_INIT_TAKE1("H2SerializeHeaders", h2_conf_set_serialize_headers, NULL,
                    RSRC_CONF, "on to enable header serialization for compatibility"),
      AP_INIT_TAKE1("H2ModernTLSOnly", h2_conf_set_modern_tls_only, NULL,
                    RSRC_CONF, "off to not impose RFC 7540 restrictions on TLS"),
      AP_INIT_TAKE1("H2Upgrade", h2_conf_set_upgrade, NULL,
                    RSRC_CONF, "on to allow HTTP/1 Upgrades to h2/h2c"),
      AP_INIT_TAKE1("H2Direct", h2_conf_set_direct, NULL,
                    RSRC_CONF, "on to enable direct HTTP/2 mode"),
      AP_INIT_TAKE1("H2SessionExtraFiles", h2_conf_set_session_extra_files, NULL,
                    RSRC_CONF, "number of extra file a session might keep open (obsolete)"),
      AP_INIT_TAKE1("H2TLSWarmUpSize", h2_conf_set_tls_warmup_size, NULL,
                    RSRC_CONF, "number of bytes on TLS connection before doing max writes"),
      AP_INIT_TAKE1("H2TLSCoolDownSecs", h2_conf_set_tls_cooldown_secs, NULL,
                    RSRC_CONF, "seconds of idle time on TLS before shrinking writes"),
      AP_INIT_TAKE1("H2Push", h2_conf_set_push, NULL,
                    RSRC_CONF, "off to disable HTTP/2 server push"),
      AP_INIT_TAKE23("H2PushPriority", h2_conf_add_push_priority, NULL,
                    RSRC_CONF, "define priority of PUSHed resources per content type"),
      AP_INIT_TAKE1("H2PushDiarySize", h2_conf_set_push_diary_size, NULL,
                    RSRC_CONF, "size of push diary"),
      AP_INIT_TAKE1("H2CopyFiles", h2_conf_set_copy_files, NULL,
                    OR_FILEINFO, "on to perform copy of file data"),
      AP_INIT_TAKE123("H2PushResource", h2_conf_add_push_res, NULL,
                     OR_FILEINFO, "add a resource to be pushed in this location/on this server."),
      AP_INIT_TAKE1("H2EarlyHints", h2_conf_set_early_hints, NULL,
                    RSRC_CONF, "on to enable interim status 103 responses"),
      AP_END_CMD
  };
  
  
  const h2_config *h2_config_rget(request_rec *r)
  {
      h2_config *cfg = (h2_config *)ap_get_module_config(r->per_dir_config, 
                                                         &http2_module);
      return cfg? cfg : h2_config_sget(r->server); 
  }
  
  const h2_config *h2_config_get(conn_rec *c)
  {
      h2_ctx *ctx = h2_ctx_get(c, 0);
      
      if (ctx) {
          if (ctx->config) {
              return ctx->config;
          }
          else if (ctx->server) {
              ctx->config = h2_config_sget(ctx->server);
              return ctx->config;
          }
      }
      
      return h2_config_sget(c->base_server);
  }
  