text: /* Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 "apr.h"
  #include "apr_lib.h"
  #include "apr_strings.h"
  
  #define APR_WANT_STRFUNC
  #include "apr_want.h"
  
  #if APR_HAVE_STDLIB_H
  #include <stdlib.h>
  #endif
  
  #include "ap_config.h"
  #include "httpd.h"
  #include "http_config.h"
  #include "http_main.h"
  #include "http_log.h"
  #include "http_core.h"
  #include "http_protocol.h"
  #include "http_request.h"       /* for sub_req_lookup_uri() */
  #include "util_script.h"
  #include "apr_date.h"           /* For apr_date_parse_http() */
  #include "util_ebcdic.h"
  
  #ifdef OS2
  #define INCL_DOS
  #include <os2.h>
  #endif
  
  /*
   * Various utility functions which are common to a whole lot of
   * script-type extensions mechanisms, and might as well be gathered
   * in one place (if only to avoid creating inter-module dependancies
   * where there don't have to be).
   */
  
  /* we know core's module_index is 0 */
  #undef APLOG_MODULE_INDEX
  #define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX
  
  static char *http2env(request_rec *r, const char *w)
  {
      char *res = (char *)apr_palloc(r->pool, sizeof("HTTP_") + strlen(w));
      char *cp = res;
      char c;
  
      *cp++ = 'H';
      *cp++ = 'T';
      *cp++ = 'T';
      *cp++ = 'P';
      *cp++ = '_';
  
      while ((c = *w++) != 0) {
          if (apr_isalnum(c)) {
              *cp++ = apr_toupper(c);
          }
          else if (c == '-') {
              *cp++ = '_';
          }
          else {
              if (APLOGrtrace1(r))
                  ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
                              "Not exporting header with invalid name as envvar: %s",
                              ap_escape_logitem(r->pool, w));
              return NULL;
          }
      }
      *cp = 0;
  
      return res;
  }
  
  static void add_unless_null(apr_table_t *table, const char *name, const char *val)
  {
      if (name && val) {
          apr_table_addn(table, name, val);
      }
  }
  
  static void env2env(apr_table_t *table, const char *name)
  {
      add_unless_null(table, name, getenv(name));
  }
  
  AP_DECLARE(char **) ap_create_environment(apr_pool_t *p, apr_table_t *t)
  {
      const apr_array_header_t *env_arr = apr_table_elts(t);
      const apr_table_entry_t *elts = (const apr_table_entry_t *) env_arr->elts;
      char **env = (char **) apr_palloc(p, (env_arr->nelts + 2) * sizeof(char *));
      int i, j;
      char *tz;
      char *whack;
  
      j = 0;
      if (!apr_table_get(t, "TZ")) {
          tz = getenv("TZ");
          if (tz != NULL) {
              env[j++] = apr_pstrcat(p, "TZ=", tz, NULL);
          }
      }
      for (i = 0; i < env_arr->nelts; ++i) {
          if (!elts[i].key) {
              continue;
          }
          env[j] = apr_pstrcat(p, elts[i].key, "=", elts[i].val, NULL);
          whack = env[j];
          if (apr_isdigit(*whack)) {
              *whack++ = '_';
          }
          while (*whack != '=') {
  #ifdef WIN32
              if (!apr_isalnum(*whack) && *whack != '(' && *whack != ')') {
  #else
              if (!apr_isalnum(*whack)) {
  #endif
                  *whack = '_';
              }
              ++whack;
          }
          ++j;
      }
  
      env[j] = NULL;
      return env;
  }
  
  AP_DECLARE(void) ap_add_common_vars(request_rec *r)
  {
      apr_table_t *e;
      server_rec *s = r->server;
      conn_rec *c = r->connection;
      core_dir_config *conf =
          (core_dir_config *)ap_get_core_module_config(r->per_dir_config);
      const char *env_temp;
      const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
      const apr_table_entry_t *hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
      int i;
      apr_port_t rport;
      char *q;
  
      /* use a temporary apr_table_t which we'll overlap onto
       * r->subprocess_env later
       * (exception: if r->subprocess_env is empty at the start,
       * write directly into it)
       */
      if (apr_is_empty_table(r->subprocess_env)) {
          e = r->subprocess_env;
      }
      else {
          e = apr_table_make(r->pool, 25 + hdrs_arr->nelts);
      }
  
      /* First, add environment vars from headers... this is as per
       * CGI specs, though other sorts of scripting interfaces see
       * the same vars...
       */
  
      for (i = 0; i < hdrs_arr->nelts; ++i) {
          if (!hdrs[i].key) {
              continue;
          }
  
          /* A few headers are special cased --- Authorization to prevent
           * rogue scripts from capturing passwords; content-type and -length
           * for no particular reason.
           */
  
          if (!ap_cstr_casecmp(hdrs[i].key, "Content-type")) {
              apr_table_addn(e, "CONTENT_TYPE", hdrs[i].val);
          }
          else if (!ap_cstr_casecmp(hdrs[i].key, "Content-length")) {
              apr_table_addn(e, "CONTENT_LENGTH", hdrs[i].val);
          }
          /* HTTP_PROXY collides with a popular envvar used to configure
           * proxies, don't let clients set/override it.  But, if you must...
           */
  #ifndef SECURITY_HOLE_PASS_PROXY
          else if (!ap_cstr_casecmp(hdrs[i].key, "Proxy")) {
              ;
          }
  #endif
          /*
           * You really don't want to disable this check, since it leaves you
           * wide open to CGIs stealing passwords and people viewing them
           * in the environment with "ps -e".  But, if you must...
           */
  #ifndef SECURITY_HOLE_PASS_AUTHORIZATION
          else if (!ap_cstr_casecmp(hdrs[i].key, "Authorization")
                   || !ap_cstr_casecmp(hdrs[i].key, "Proxy-Authorization")) {
              if (conf->cgi_pass_auth == AP_CGI_PASS_AUTH_ON) {
                  add_unless_null(e, http2env(r, hdrs[i].key), hdrs[i].val);
              }
          }
  #endif
          else
              add_unless_null(e, http2env(r, hdrs[i].key), hdrs[i].val);
      }
  
      env_temp = apr_table_get(r->subprocess_env, "PATH");
      if (env_temp == NULL) {
          env_temp = getenv("PATH");
      }
      if (env_temp == NULL) {
          env_temp = DEFAULT_PATH;
      }
      apr_table_addn(e, "PATH", apr_pstrdup(r->pool, env_temp));
  
  #if defined(WIN32)
      env2env(e, "SystemRoot");
      env2env(e, "COMSPEC");
      env2env(e, "PATHEXT");
      env2env(e, "WINDIR");
  #elif defined(OS2)
      env2env(e, "COMSPEC");
      env2env(e, "ETC");
      env2env(e, "DPATH");
      env2env(e, "PERLLIB_PREFIX");
  #elif defined(BEOS)
      env2env(e, "LIBRARY_PATH");
  #elif defined(DARWIN)
      env2env(e, "DYLD_LIBRARY_PATH");
  #elif defined(_AIX)
      env2env(e, "LIBPATH");
  #elif defined(__HPUX__)
      /* HPUX PARISC 2.0W knows both, otherwise redundancy is harmless */
      env2env(e, "SHLIB_PATH");
      env2env(e, "LD_LIBRARY_PATH");
  #else /* Some Unix */
      env2env(e, "LD_LIBRARY_PATH");
  #endif
  
      apr_table_addn(e, "SERVER_SIGNATURE", ap_psignature("", r));
      apr_table_addn(e, "SERVER_SOFTWARE", ap_get_server_banner());
      apr_table_addn(e, "SERVER_NAME",
                     ap_escape_html(r->pool, ap_get_server_name_for_url(r)));
      apr_table_addn(e, "SERVER_ADDR", r->connection->local_ip);  /* Apache */
      apr_table_addn(e, "SERVER_PORT",
                    apr_psprintf(r->pool, "%u", ap_get_server_port(r)));
      add_unless_null(e, "REMOTE_HOST",
                      ap_get_useragent_host(r, REMOTE_HOST, NULL));
      apr_table_addn(e, "REMOTE_ADDR", r->useragent_ip);
      apr_table_addn(e, "DOCUMENT_ROOT", ap_document_root(r));    /* Apache */
      apr_table_setn(e, "REQUEST_SCHEME", ap_http_scheme(r));
      apr_table_addn(e, "CONTEXT_PREFIX", ap_context_prefix(r));
      apr_table_addn(e, "CONTEXT_DOCUMENT_ROOT", ap_context_document_root(r));
      apr_table_addn(e, "SERVER_ADMIN", s->server_admin); /* Apache */
      if (apr_table_get(r->notes, "proxy-noquery") && (q = ap_strchr(r->filename, '?'))) {
          *q = '\0';
          apr_table_addn(e, "SCRIPT_FILENAME", apr_pstrdup(r->pool, r->filename));
          *q = '?';
      }
      else {
          apr_table_addn(e, "SCRIPT_FILENAME", r->filename);  /* Apache */
      }
  
      rport = c->client_addr->port;
      apr_table_addn(e, "REMOTE_PORT", apr_itoa(r->pool, rport));
  
      if (r->user) {
          apr_table_addn(e, "REMOTE_USER", r->user);
      }
      else if (r->prev) {
          request_rec *back = r->prev;
  
          while (back) {
              if (back->user) {
                  apr_table_addn(e, "REDIRECT_REMOTE_USER", back->user);
                  break;
              }
              back = back->prev;
          }
      }
      add_unless_null(e, "AUTH_TYPE", r->ap_auth_type);
      env_temp = ap_get_remote_logname(r);
      if (env_temp) {
          apr_table_addn(e, "REMOTE_IDENT", apr_pstrdup(r->pool, env_temp));
      }
  
      /* Apache custom error responses. If we have redirected set two new vars */
  
      if (r->prev) {
          if (conf->qualify_redirect_url != AP_CORE_CONFIG_ON) { 
              add_unless_null(e, "REDIRECT_URL", r->prev->uri);
          }
          else { 
              /* PR#57785: reconstruct full URL here */
              apr_uri_t *uri = &r->prev->parsed_uri;
              if (!uri->scheme) {
                  uri->scheme = (char*)ap_http_scheme(r->prev);
              }
              if (!uri->port) {
                  uri->port = ap_get_server_port(r->prev);
                  uri->port_str = apr_psprintf(r->pool, "%u", uri->port);
              }
              if (!uri->hostname) {
                  uri->hostname = (char*)ap_get_server_name_for_url(r->prev);
              }
              add_unless_null(e, "REDIRECT_URL",
                              apr_uri_unparse(r->pool, uri, 0));
          }
          add_unless_null(e, "REDIRECT_QUERY_STRING", r->prev->args);
      }
  
      if (e != r->subprocess_env) {
          apr_table_overlap(r->subprocess_env, e, APR_OVERLAP_TABLES_SET);
      }
  }
  
  /* This "cute" little function comes about because the path info on
   * filenames and URLs aren't always the same. So we take the two,
   * and find as much of the two that match as possible.
   */
  
  AP_DECLARE(int) ap_find_path_info(const char *uri, const char *path_info)
  {
      int lu = strlen(uri);
      int lp = strlen(path_info);
  
      while (lu-- && lp-- && uri[lu] == path_info[lp]) {
          if (path_info[lp] == '/') {
              while (lu && uri[lu-1] == '/') lu--;
          }
      }
  
      if (lu == -1) {
          lu = 0;
      }
  
      while (uri[lu] != '\0' && uri[lu] != '/') {
          lu++;
      }
      return lu;
  }
  
  /* Obtain the Request-URI from the original request-line, returning
   * a new string from the request pool containing the URI or "".
   */
  static char *original_uri(request_rec *r)
  {
      char *first, *last;
  
      if (r->the_request == NULL) {
          return (char *) apr_pcalloc(r->pool, 1);
      }
  
      first = r->the_request;     /* use the request-line */
  
      while (*first && !apr_isspace(*first)) {
          ++first;                /* skip over the method */
      }
      while (apr_isspace(*first)) {
          ++first;                /*   and the space(s)   */
      }
  
      last = first;
      while (*last && !apr_isspace(*last)) {
          ++last;                 /* end at next whitespace */
      }
  
      return apr_pstrmemdup(r->pool, first, last - first);
  }
  
  AP_DECLARE(void) ap_add_cgi_vars(request_rec *r)
  {
      apr_table_t *e = r->subprocess_env;
      core_dir_config *conf =
          (core_dir_config *)ap_get_core_module_config(r->per_dir_config);
      int request_uri_from_original = 1;
      const char *request_uri_rule;
  
      apr_table_setn(e, "GATEWAY_INTERFACE", "CGI/1.1");
      apr_table_setn(e, "SERVER_PROTOCOL", r->protocol);
      apr_table_setn(e, "REQUEST_METHOD", r->method);
      apr_table_setn(e, "QUERY_STRING", r->args ? r->args : "");
  
      if (conf->cgi_var_rules) {
          request_uri_rule = apr_hash_get(conf->cgi_var_rules, "REQUEST_URI",
                                          APR_HASH_KEY_STRING);
          if (request_uri_rule && !strcmp(request_uri_rule, "current-uri")) {
              request_uri_from_original = 0;
          }
      }
      apr_table_setn(e, "REQUEST_URI",
                     request_uri_from_original ? original_uri(r) : r->uri);
  
      /* Note that the code below special-cases scripts run from includes,
       * because it "knows" that the sub_request has been hacked to have the
       * args and path_info of the original request, and not any that may have
       * come with the script URI in the include command.  Ugh.
       */
  
      if (!strcmp(r->protocol, "INCLUDED")) {
          apr_table_setn(e, "SCRIPT_NAME", r->uri);
          if (r->path_info && *r->path_info) {
              apr_table_setn(e, "PATH_INFO", r->path_info);
          }
      }
      else if (!r->path_info || !*r->path_info) {
          apr_table_setn(e, "SCRIPT_NAME", r->uri);
      }
      else {
          int path_info_start = ap_find_path_info(r->uri, r->path_info);
  
          apr_table_setn(e, "SCRIPT_NAME",
                        apr_pstrndup(r->pool, r->uri, path_info_start));
  
          apr_table_setn(e, "PATH_INFO", r->path_info);
      }
  
      if (r->path_info && r->path_info[0]) {
          /*
           * To get PATH_TRANSLATED, treat PATH_INFO as a URI path.
           * Need to re-escape it for this, since the entire URI was
           * un-escaped before we determined where the PATH_INFO began.
           */
          request_rec *pa_req;
  
          pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info), r,
                                         NULL);
  
          if (pa_req->filename) {
              char *pt = apr_pstrcat(r->pool, pa_req->filename, pa_req->path_info,
                                    NULL);
  #ifdef WIN32
              /* We need to make this a real Windows path name */
              apr_filepath_merge(&pt, "", pt, APR_FILEPATH_NATIVE, r->pool);
  #endif
              apr_table_setn(e, "PATH_TRANSLATED", pt);
          }
          ap_destroy_sub_req(pa_req);
      }
  }
  
  
  static int set_cookie_doo_doo(void *v, const char *key, const char *val)
  {
      apr_table_addn(v, key, val);
      return 1;
  }
  
  #define HTTP_UNSET (-HTTP_OK)
  #define SCRIPT_LOG_MARK  __FILE__,__LINE__,module_index
  
  AP_DECLARE(int) ap_scan_script_header_err_core_ex(request_rec *r, char *buffer,
                                         int (*getsfunc) (char *, int, void *),
                                         void *getsfunc_data,
                                         int module_index)
  {
      char x[MAX_STRING_LEN];
      char *w, *l;
      int p;
      int cgi_status = HTTP_UNSET;
      apr_table_t *merge;
      apr_table_t *cookie_table;
      int trace_log = APLOG_R_MODULE_IS_LEVEL(r, module_index, APLOG_TRACE1);
      int first_header = 1;
  
      if (buffer) {
          *buffer = '\0';
      }
      w = buffer ? buffer : x;
  
      /* temporary place to hold headers to merge in later */
      merge = apr_table_make(r->pool, 10);
  
      /* The HTTP specification says that it is legal to merge duplicate
       * headers into one.  Some browsers that support Cookies don't like
       * merged headers and prefer that each Set-Cookie header is sent
       * separately.  Lets humour those browsers by not merging.
       * Oh what a pain it is.
       */
      cookie_table = apr_table_make(r->pool, 2);
      apr_table_do(set_cookie_doo_doo, cookie_table, r->err_headers_out, "Set-Cookie", NULL);
  
      while (1) {
  
          int rv = (*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data);
          if (rv == 0) {
              const char *msg = "Premature end of script headers";
              if (first_header)
                  msg = "End of script output before headers";
              /* Intentional no APLOGNO */
              ap_log_rerror(SCRIPT_LOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
                            "%s: %s", msg,
                            apr_filepath_name_get(r->filename));
              return HTTP_INTERNAL_SERVER_ERROR;
          }
          else if (rv == -1) {
              /* Intentional no APLOGNO */
              ap_log_rerror(SCRIPT_LOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
                            "Script timed out before returning headers: %s",
                            apr_filepath_name_get(r->filename));
              return HTTP_GATEWAY_TIME_OUT;
          }
  
          /* Delete terminal (CR?)LF */
  
          p = strlen(w);
               /* Indeed, the host's '\n':
                  '\012' for UNIX; '\015' for MacOS; '\025' for OS/390
                   -- whatever the script generates.
               */
          if (p > 0 && w[p - 1] == '\n') {
              if (p > 1 && w[p - 2] == CR) {
                  w[p - 2] = '\0';
              }
              else {
                  w[p - 1] = '\0';
              }
          }
  
          /*
           * If we've finished reading the headers, check to make sure any
           * HTTP/1.1 conditions are met.  If so, we're done; normal processing
           * will handle the script's output.  If not, just return the error.
           * The appropriate thing to do would be to send the script process a
           * SIGPIPE to let it know we're ignoring it, close the channel to the
           * script process, and *then* return the failed-to-meet-condition
           * error.  Otherwise we'd be waiting for the script to finish
           * blithering before telling the client the output was no good.
           * However, we don't have the information to do that, so we have to
           * leave it to an upper layer.
           */
          if (w[0] == '\0') {
              int cond_status = OK;
  
              /* PR#38070: This fails because it gets confused when a
               * CGI Status header overrides ap_meets_conditions.
               *
               * We can fix that by dropping ap_meets_conditions when
               * Status has been set.  Since this is the only place
               * cgi_status gets used, let's test it explicitly.
               *
               * The alternative would be to ignore CGI Status when
               * ap_meets_conditions returns anything interesting.
               * That would be safer wrt HTTP, but would break CGI.
               */
              if ((cgi_status == HTTP_UNSET) && (r->method_number == M_GET)) {
                  cond_status = ap_meets_conditions(r);
              }
              apr_table_overlap(r->err_headers_out, merge,
                  APR_OVERLAP_TABLES_MERGE);
              if (!apr_is_empty_table(cookie_table)) {
                  /* the cookies have already been copied to the cookie_table */
                  apr_table_unset(r->err_headers_out, "Set-Cookie");
                  r->err_headers_out = apr_table_overlay(r->pool,
                      r->err_headers_out, cookie_table);
              }
              return cond_status;
          }
  
          if (trace_log) {
              if (first_header)
                  ap_log_rerror(SCRIPT_LOG_MARK, APLOG_TRACE4, 0, r,
                                "Headers from script '%s':",
                                apr_filepath_name_get(r->filename));
              ap_log_rerror(SCRIPT_LOG_MARK, APLOG_TRACE4, 0, r, "  %s", w);
          }
  
          /* if we see a bogus header don't ignore it. Shout and scream */
  
  #if APR_CHARSET_EBCDIC
              /* Chances are that we received an ASCII header text instead of
               * the expected EBCDIC header lines. Try to auto-detect:
               */
          if (!(l = strchr(w, ':'))) {
              int maybeASCII = 0, maybeEBCDIC = 0;
              unsigned char *cp, native;
              apr_size_t inbytes_left, outbytes_left;
  
              for (cp = w; *cp != '\0'; ++cp) {
                  native = apr_xlate_conv_byte(ap_hdrs_from_ascii, *cp);
                  if (apr_isprint(*cp) && !apr_isprint(native))
                      ++maybeEBCDIC;
                  if (!apr_isprint(*cp) && apr_isprint(native))
                      ++maybeASCII;
              }
              if (maybeASCII > maybeEBCDIC) {
                  ap_log_error(SCRIPT_LOG_MARK, APLOG_ERR, 0, r->server,
                               APLOGNO(02660) "CGI Interface Error: "
                               "Script headers apparently ASCII: (CGI = %s)",
                               r->filename);
                  inbytes_left = outbytes_left = cp - w;
                  apr_xlate_conv_buffer(ap_hdrs_from_ascii,
                                        w, &inbytes_left, w, &outbytes_left);
              }
          }
  #endif /*APR_CHARSET_EBCDIC*/
          if (!(l = strchr(w, ':'))) {
              if (!buffer) {
                  /* Soak up all the script output - may save an outright kill */
                  while ((*getsfunc)(w, MAX_STRING_LEN - 1, getsfunc_data) > 0) {
                      continue;
                  }
              }
  
              /* Intentional no APLOGNO */
              ap_log_rerror(SCRIPT_LOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
                            "malformed header from script '%s': Bad header: %.30s",
                            apr_filepath_name_get(r->filename), w);
              return HTTP_INTERNAL_SERVER_ERROR;
          }
  
          *l++ = '\0';
          while (apr_isspace(*l)) {
              ++l;
          }
  
          if (!ap_cstr_casecmp(w, "Content-type")) {
              char *tmp;
  
              /* Nuke trailing whitespace */
  
              char *endp = l + strlen(l) - 1;
              while (endp > l && apr_isspace(*endp)) {
                  *endp-- = '\0';
              }
  
              tmp = apr_pstrdup(r->pool, l);
              ap_content_type_tolower(tmp);
              ap_set_content_type(r, tmp);
          }
          /*
           * If the script returned a specific status, that's what
           * we'll use - otherwise we assume 200 OK.
           */
          else if (!ap_cstr_casecmp(w, "Status")) {
              r->status = cgi_status = atoi(l);
              if (!ap_is_HTTP_VALID_RESPONSE(cgi_status))
                  /* Intentional no APLOGNO */
                  ap_log_rerror(SCRIPT_LOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
                                "Invalid status line from script '%s': %.30s",
                                apr_filepath_name_get(r->filename), l);
              else
                  if (APLOGrtrace1(r))
                     ap_log_rerror(SCRIPT_LOG_MARK, APLOG_TRACE1, 0, r,
                                   "Status line from script '%s': %.30s",
                                   apr_filepath_name_get(r->filename), l);
              r->status_line = apr_pstrdup(r->pool, l);
          }
          else if (!ap_cstr_casecmp(w, "Location")) {
              apr_table_set(r->headers_out, w, l);
          }
          else if (!ap_cstr_casecmp(w, "Content-Length")) {
              apr_table_set(r->headers_out, w, l);
          }
          else if (!ap_cstr_casecmp(w, "Content-Range")) {
              apr_table_set(r->headers_out, w, l);
          }
          else if (!ap_cstr_casecmp(w, "Transfer-Encoding")) {
              apr_table_set(r->headers_out, w, l);
          }
          else if (!ap_cstr_casecmp(w, "ETag")) {
              apr_table_set(r->headers_out, w, l);
          }
          /*
           * If the script gave us a Last-Modified header, we can't just
           * pass it on blindly because of restrictions on future or invalid values.
           */
          else if (!ap_cstr_casecmp(w, "Last-Modified")) {
              apr_time_t parsed_date = apr_date_parse_http(l);
              if (parsed_date != APR_DATE_BAD) {
                  ap_update_mtime(r, parsed_date);
                  ap_set_last_modified(r);
                  if (APLOGrtrace1(r)) {
                      apr_time_t last_modified_date = apr_date_parse_http(apr_table_get(r->headers_out,
                                                                                        "Last-Modified"));
                      /*
                       * A Last-Modified header value coming from a (F)CGI source
                       * is considered HTTP input so we assume the GMT timezone.
                       * The following logs should inform the admin about violations
                       * and related actions taken by httpd.
                       * The apr_date_parse_rfc function is 'timezone aware'
                       * and it will be used to generate a more informative set of logs
                       * (we don't use it as a replacement of apr_date_parse_http
                       * for the aforementioned reason).
                       */
                      apr_time_t parsed_date_tz_aware = apr_date_parse_rfc(l);
  
                      /* 
                       * The parsed Last-Modified header datestring has been replaced by httpd.
                       */
                      if (parsed_date > last_modified_date) {
                          ap_log_rerror(SCRIPT_LOG_MARK, APLOG_TRACE1, 0, r,
                                        "The Last-Modified header value %s (%s) "
                                        "has been replaced with '%s'", l,
                                        parsed_date != parsed_date_tz_aware ? "not in GMT"
                                                                            : "in the future",
                                        apr_table_get(r->headers_out, "Last-Modified"));
                      /* 
                       * Last-Modified header datestring not in GMT and not considered in the future
                       * by httpd (like now() + 1 hour in the PST timezone). No action is taken but
                       * the admin is warned about the violation.
                       */
                      } else if (parsed_date != parsed_date_tz_aware) {
                          ap_log_rerror(SCRIPT_LOG_MARK, APLOG_TRACE1, 0, r,
                                        "The Last-Modified header value is not set "
                                        "within the GMT timezone (as required)");
                      }
                  }
              }
              else {
                  if (APLOGrtrace1(r))
                     ap_log_rerror(SCRIPT_LOG_MARK, APLOG_TRACE1, 0, r,
                                   "Ignored invalid header value: Last-Modified: '%s'", l);
              }
          }
          else if (!ap_cstr_casecmp(w, "Set-Cookie")) {
              apr_table_add(cookie_table, w, l);
          }
          else {
              apr_table_add(merge, w, l);
          }
          first_header = 0;
      }
      /* never reached - we leave this function within the while loop above */
      return OK;
  }
  
  AP_DECLARE(int) ap_scan_script_header_err_core(request_rec *r, char *buffer,
                                         int (*getsfunc) (char *, int, void *),
                                         void *getsfunc_data)
  {
      return ap_scan_script_header_err_core_ex(r, buffer, getsfunc,
                                               getsfunc_data,
                                               APLOG_MODULE_INDEX);
  }
  
  static int getsfunc_FILE(char *buf, int len, void *f)
  {
      return apr_file_gets(buf, len, (apr_file_t *) f) == APR_SUCCESS;
  }
  
  AP_DECLARE(int) ap_scan_script_header_err(request_rec *r, apr_file_t *f,
                                            char *buffer)
  {
      return ap_scan_script_header_err_core_ex(r, buffer, getsfunc_FILE, f,
                                               APLOG_MODULE_INDEX);
  }
  
  AP_DECLARE(int) ap_scan_script_header_err_ex(request_rec *r, apr_file_t *f,
                                            char *buffer, int module_index)
  {
      return ap_scan_script_header_err_core_ex(r, buffer, getsfunc_FILE, f,
                                               module_index);
  }
  
  
  static int getsfunc_BRIGADE(char *buf, int len, void *arg)
  {
      apr_bucket_brigade *bb = (apr_bucket_brigade *)arg;
      const char *dst_end = buf + len - 1; /* leave room for terminating null */
      char *dst = buf;
      apr_bucket *e = APR_BRIGADE_FIRST(bb);
      apr_status_t rv;
      int done = 0;
  
      while ((dst < dst_end) && !done && e != APR_BRIGADE_SENTINEL(bb)
             && !APR_BUCKET_IS_EOS(e)) {
          const char *bucket_data;
          apr_size_t bucket_data_len;
          const char *src;
          const char *src_end;
          apr_bucket * next;
  
          rv = apr_bucket_read(e, &bucket_data, &bucket_data_len,
                               APR_BLOCK_READ);
          if (rv != APR_SUCCESS || (bucket_data_len == 0)) {
              *dst = '\0';
              return APR_STATUS_IS_TIMEUP(rv) ? -1 : 0;
          }
          src = bucket_data;
          src_end = bucket_data + bucket_data_len;
          while ((src < src_end) && (dst < dst_end) && !done) {
              if (*src == '\n') {
                  done = 1;
              }
              else if (*src != '\r') {
                  *dst++ = *src;
              }
              src++;
          }
  
          if (src < src_end) {
              apr_bucket_split(e, src - bucket_data);
          }
          next = APR_BUCKET_NEXT(e);
          apr_bucket_delete(e);
          e = next;
      }
      *dst = 0;
      return done;
  }
  
  AP_DECLARE(int) ap_scan_script_header_err_brigade(request_rec *r,
                                                    apr_bucket_brigade *bb,
                                                    char *buffer)
  {
      return ap_scan_script_header_err_core_ex(r, buffer, getsfunc_BRIGADE, bb,
                                               APLOG_MODULE_INDEX);
  }
  
  AP_DECLARE(int) ap_scan_script_header_err_brigade_ex(request_rec *r,
                                                       apr_bucket_brigade *bb,
                                                       char *buffer,
                                                       int module_index)
  {
      return ap_scan_script_header_err_core_ex(r, buffer, getsfunc_BRIGADE, bb,
                                               module_index);
  }
  
  
  struct vastrs {
      va_list args;
      int arg;
      const char *curpos;
  };
  
  static int getsfunc_STRING(char *w, int len, void *pvastrs)
  {
      struct vastrs *strs = (struct vastrs*) pvastrs;
      const char *p;
      int t;
  
      if (!strs->curpos || !*strs->curpos) {
          w[0] = '\0';
          return 0;
      }
      p = ap_strchr_c(strs->curpos, '\n');
      if (p)
          ++p;
      else
          p = ap_strchr_c(strs->curpos, '\0');
      t = p - strs->curpos;
      if (t > len)
          t = len;
      strncpy (w, strs->curpos, t);
      w[t] = '\0';
      if (!strs->curpos[t]) {
          ++strs->arg;
          strs->curpos = va_arg(strs->args, const char *);
      }
      else
          strs->curpos += t;
      return t;
  }
  
  /* ap_scan_script_header_err_strs() accepts additional const char* args...
   * each is treated as one or more header lines, and the first non-header
   * character is returned to **arg, **data.  (The first optional arg is
   * counted as 0.)
   */
  AP_DECLARE_NONSTD(int) ap_scan_script_header_err_strs_ex(request_rec *r,
                                                           char *buffer,
                                                           int module_index,
                                                           const char **termch,
                                                           int *termarg, ...)
  {
      struct vastrs strs;
      int res;
  
      va_start(strs.args, termarg);
      strs.arg = 0;
      strs.curpos = va_arg(strs.args, char*);
      res = ap_scan_script_header_err_core_ex(r, buffer, getsfunc_STRING,
                                              (void *) &strs, module_index);
      if (termch)
          *termch = strs.curpos;
      if (termarg)
          *termarg = strs.arg;
      va_end(strs.args);
      return res;
  }
  
  AP_DECLARE_NONSTD(int) ap_scan_script_header_err_strs(request_rec *r,
                                                        char *buffer,
                                                        const char **termch,
                                                        int *termarg, ...)
  {
      struct vastrs strs;
      int res;
  
      va_start(strs.args, termarg);
      strs.arg = 0;
      strs.curpos = va_arg(strs.args, char*);
      res = ap_scan_script_header_err_core_ex(r, buffer, getsfunc_STRING,
                                              (void *) &strs, APLOG_MODULE_INDEX);
      if (termch)
          *termch = strs.curpos;
      if (termarg)
          *termarg = strs.arg;
      va_end(strs.args);
      return res;
  }
  
  static void
  argstr_to_table(char *str, apr_table_t *parms)
  {
      char *key;
      char *value;
      char *strtok_state;
  
      if (str == NULL) {
          return;
      }
  
      key = apr_strtok(str, "&", &strtok_state);
      while (key) {
          value = strchr(key, '=');
          if (value) {
              *value = '\0';      /* Split the string in two */
              value++;            /* Skip passed the = */
          }
          else {
              value = "1";
          }
          ap_unescape_url(key);
          ap_unescape_url(value);
          apr_table_set(parms, key, value);
          key = apr_strtok(NULL, "&", &strtok_state);
      }
  }
  
  AP_DECLARE(void) ap_args_to_table(request_rec *r, apr_table_t **table)
  {
      apr_table_t *t = apr_table_make(r->pool, 10);
      argstr_to_table(apr_pstrdup(r->pool, r->args), t);
      *table = t;
  }
  