http.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*!
 * \file
 * \brief http server for AMI access
 *
 * \author Mark Spencer <[email protected]>
 *
 * This program implements a tiny http server
 * and was inspired by micro-httpd by Jef Poskanzer
 *
 * GMime http://spruce.sourceforge.net/gmime/
 *
 * \ref AstHTTP - AMI over the http protocol
 */

/*! \li \ref http.c uses the configuration file \ref http.conf
 * \addtogroup configuration_file
 */

/*! \page http.conf http.conf
 * \verbinclude http.conf.sample
 */

/*** MODULEINFO
   <support_level>core</support_level>
 ***/

#include "asterisk.h"

#include <time.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <signal.h>
#include <fcntl.h>

#include "asterisk/paths.h"   /* use ast_config_AST_DATA_DIR */
#include "asterisk/cli.h"
#include "asterisk/tcptls.h"
#include "asterisk/http.h"
#include "asterisk/utils.h"
#include "asterisk/strings.h"
#include "asterisk/config.h"
#include "asterisk/stringfields.h"
#include "asterisk/ast_version.h"
#include "asterisk/manager.h"
#include "asterisk/module.h"
#include "asterisk/astobj2.h"
#include "asterisk/netsock2.h"
#include "asterisk/json.h"

#define MAX_PREFIX 80
#define DEFAULT_PORT 8088
#define DEFAULT_TLS_PORT 8089
#define DEFAULT_SESSION_LIMIT 100
/*! (ms) Idle time waiting for data. */
#define DEFAULT_SESSION_INACTIVITY 30000
/*! (ms) Min timeout for initial HTTP request to start coming in. */
#define MIN_INITIAL_REQUEST_TIMEOUT 10000
/*! (ms) Idle time between HTTP requests */
#define DEFAULT_SESSION_KEEP_ALIVE 15000
/*! Max size for the http server name */
#define  MAX_SERVER_NAME_LENGTH 128
/*! Max size for the http response header */
#define  DEFAULT_RESPONSE_HEADER_LENGTH 512

/*! Maximum application/json or application/x-www-form-urlencoded body content length. */
#if !defined(LOW_MEMORY)
#define MAX_CONTENT_LENGTH 40960
#else
#define MAX_CONTENT_LENGTH 1024
#endif   /* !defined(LOW_MEMORY) */

/*! Initial response body length. */
#if !defined(LOW_MEMORY)
#define INITIAL_RESPONSE_BODY_BUFFER 1024
#else
#define INITIAL_RESPONSE_BODY_BUFFER 512
#endif   /* !defined(LOW_MEMORY) */

/*! Maximum line length for HTTP requests. */
#if !defined(LOW_MEMORY)
#define MAX_HTTP_LINE_LENGTH 4096
#else
#define MAX_HTTP_LINE_LENGTH 1024
#endif   /* !defined(LOW_MEMORY) */

static char http_server_name[MAX_SERVER_NAME_LENGTH];

static int session_limit = DEFAULT_SESSION_LIMIT;
static int session_inactivity = DEFAULT_SESSION_INACTIVITY;
static int session_keep_alive = DEFAULT_SESSION_KEEP_ALIVE;
static int session_count = 0;

static struct ast_tls_config http_tls_cfg;

static void *httpd_helper_thread(void *arg);

/*!
 * we have up to two accepting threads, one for http, one for https
 */
static struct ast_tcptls_session_args http_desc = {
   .accept_fd = -1,
   .master = AST_PTHREADT_NULL,
   .tls_cfg = NULL,
   .poll_timeout = -1,
   .name = "http server",
   .accept_fn = ast_tcptls_server_root,
   .worker_fn = httpd_helper_thread,
};

static struct ast_tcptls_session_args https_desc = {
   .accept_fd = -1,
   .master = AST_PTHREADT_NULL,
   .tls_cfg = &http_tls_cfg,
   .poll_timeout = -1,
   .name = "https server",
   .accept_fn = ast_tcptls_server_root,
   .worker_fn = httpd_helper_thread,
};

static AST_RWLIST_HEAD_STATIC(uris, ast_http_uri); /*!< list of supported handlers */

/* all valid URIs must be prepended by the string in prefix. */
static char prefix[MAX_PREFIX];
static int static_uri_enabled;
static int status_uri_enabled;

/*! \brief Limit the kinds of files we're willing to serve up */
static struct {
   const char *ext;
   const char *mtype;
} mimetypes[] = {
   { "png", "image/png" },
   { "xml", "text/xml" },
   { "jpg", "image/jpeg" },
   { "js", "application/x-javascript" },
   { "wav", "audio/x-wav" },
   { "mp3", "audio/mpeg" },
   { "svg", "image/svg+xml" },
   { "svgz", "image/svg+xml" },
   { "gif", "image/gif" },
   { "html", "text/html" },
   { "htm", "text/html" },
   { "css", "text/css" },
   { "cnf", "text/plain" },
   { "cfg", "text/plain" },
   { "bin", "application/octet-stream" },
   { "sbn", "application/octet-stream" },
   { "ld", "application/octet-stream" },
};

struct http_uri_redirect {
   AST_LIST_ENTRY(http_uri_redirect) entry;
   char *dest;
   char target[0];
};

static AST_RWLIST_HEAD_STATIC(uri_redirects, http_uri_redirect);

static const struct ast_cfhttp_methods_text {
   enum ast_http_method method;
   const char *text;
} ast_http_methods_text[] = {
   { AST_HTTP_UNKNOWN,     "UNKNOWN" },
   { AST_HTTP_GET,         "GET" },
   { AST_HTTP_POST,        "POST" },
   { AST_HTTP_HEAD,        "HEAD" },
   { AST_HTTP_PUT,         "PUT" },
   { AST_HTTP_DELETE,      "DELETE" },
   { AST_HTTP_OPTIONS,     "OPTIONS" },
};

const char *ast_get_http_method(enum ast_http_method method)
{
   int x;

   for (x = 0; x < ARRAY_LEN(ast_http_methods_text); x++) {
      if (ast_http_methods_text[x].method == method) {
         return ast_http_methods_text[x].text;
      }
   }

   return NULL;
}

const char *ast_http_ftype2mtype(const char *ftype)
{
   int x;

   if (ftype) {
      for (x = 0; x < ARRAY_LEN(mimetypes); x++) {
         if (!strcasecmp(ftype, mimetypes[x].ext)) {
            return mimetypes[x].mtype;
         }
      }
   }
   return NULL;
}

uint32_t ast_http_manid_from_vars(struct ast_variable *headers)
{
   uint32_t mngid = 0;
   struct ast_variable *v, *cookies;

   cookies = ast_http_get_cookies(headers);
   for (v = cookies; v; v = v->next) {
      if (!strcasecmp(v->name, "mansession_id")) {
         sscanf(v->value, "%30x", &mngid);
         break;
      }
   }
   ast_variables_destroy(cookies);
   return mngid;
}

void ast_http_prefix(char *buf, int len)
{
   if (buf) {
      ast_copy_string(buf, prefix, len);
   }
}

static int static_callback(struct ast_tcptls_session_instance *ser,
   const struct ast_http_uri *urih, const char *uri,
   enum ast_http_method method, struct ast_variable *get_vars,
   struct ast_variable *headers)
{
   char *path;
   const char *ftype;
   const char *mtype;
   char wkspace[80];
   struct stat st;
   int len;
   int fd;
   struct ast_str *http_header;
   struct timeval tv;
   struct ast_tm tm;
   char timebuf[80], etag[23];
   struct ast_variable *v;
   int not_modified = 0;

   if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
      ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
      return 0;
   }

   /* Yuck.  I'm not really sold on this, but if you don't deliver static content it
    * makes your configuration substantially more challenging, but this seems like a
    * rather irritating feature creep on Asterisk.
    *
    * XXX: It is not clear to me what this comment means or if it is any longer
    *      relevant. */
   if (ast_strlen_zero(uri)) {
      goto out403;
   }

   /* Disallow any funny filenames at all (checking first character only??) */
   if ((uri[0] < 33) || strchr("./|~@#$%^&*() \t", uri[0])) {
      goto out403;
   }

   if (strstr(uri, "/..")) {
      goto out403;
   }

   if ((ftype = strrchr(uri, '.'))) {
      ftype++;
   }

   if (!(mtype = ast_http_ftype2mtype(ftype))) {
      snprintf(wkspace, sizeof(wkspace), "text/%s", S_OR(ftype, "plain"));
      mtype = wkspace;
   }

   /* Cap maximum length */
   if ((len = strlen(uri) + strlen(ast_config_AST_DATA_DIR) + strlen("/static-http/") + 5) > 1024) {
      goto out403;
   }

   path = ast_alloca(len);
   sprintf(path, "%s/static-http/%s", ast_config_AST_DATA_DIR, uri);
   if (stat(path, &st)) {
      goto out404;
   }

   if (S_ISDIR(st.st_mode)) {
      goto out404;
   }

   if (strstr(path, "/private/") && !astman_is_authed(ast_http_manid_from_vars(headers))) {
      goto out403;
   }

   fd = open(path, O_RDONLY);
   if (fd < 0) {
      goto out403;
   }

   /* make "Etag:" http header value */
   snprintf(etag, sizeof(etag), "\"%ld\"", (long)st.st_mtime);

   /* make "Last-Modified:" http header value */
   tv.tv_sec = st.st_mtime;
   tv.tv_usec = 0;
   ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&tv, &tm, "GMT"));

   /* check received "If-None-Match" request header and Etag value for file */
   for (v = headers; v; v = v->next) {
      if (!strcasecmp(v->name, "If-None-Match")) {
         if (!strcasecmp(v->value, etag)) {
            not_modified = 1;
         }
         break;
      }
   }

   http_header = ast_str_create(255);
   if (!http_header) {
      ast_http_request_close_on_completion(ser);
      ast_http_error(ser, 500, "Server Error", "Out of memory");
      close(fd);
      return 0;
   }

   ast_str_set(&http_header, 0, "Content-type: %s\r\n"
      "ETag: %s\r\n"
      "Last-Modified: %s\r\n",
      mtype,
      etag,
      timebuf);

   /* ast_http_send() frees http_header, so we don't need to do it before returning */
   if (not_modified) {
      ast_http_send(ser, method, 304, "Not Modified", http_header, NULL, 0, 1);
   } else {
      ast_http_send(ser, method, 200, NULL, http_header, NULL, fd, 1); /* static content flag is set */
   }
   close(fd);
   return 0;

out404:
   ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
   return 0;

out403:
   ast_http_request_close_on_completion(ser);
   ast_http_error(ser, 403, "Access Denied", "You do not have permission to access the requested URL.");
   return 0;
}

static int httpstatus_callback(struct ast_tcptls_session_instance *ser,
   const struct ast_http_uri *urih, const char *uri,
   enum ast_http_method method, struct ast_variable *get_vars,
   struct ast_variable *headers)
{
   struct ast_str *out;
   struct ast_variable *v, *cookies = NULL;

   if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
      ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
      return 0;
   }

   out = ast_str_create(512);
   if (!out) {
      ast_http_request_close_on_completion(ser);
      ast_http_error(ser, 500, "Server Error", "Out of memory");
      return 0;
   }

   ast_str_append(&out, 0,
      "<html><title>Asterisk HTTP Status</title>\r\n"
      "<body bgcolor=\"#ffffff\">\r\n"
      "<table bgcolor=\"#f1f1f1\" align=\"center\"><tr><td bgcolor=\"#e0e0ff\" colspan=\"2\" width=\"500\">\r\n"
      "<h2>&nbsp;&nbsp;Asterisk&trade; HTTP Status</h2></td></tr>\r\n");

   ast_str_append(&out, 0, "<tr><td><i>Server</i></td><td><b>%s</b></td></tr>\r\n", http_server_name);
   ast_str_append(&out, 0, "<tr><td><i>Prefix</i></td><td><b>%s</b></td></tr>\r\n", prefix);
   ast_str_append(&out, 0, "<tr><td><i>Bind Address</i></td><td><b>%s</b></td></tr>\r\n",
             ast_sockaddr_stringify_addr(&http_desc.old_address));
   ast_str_append(&out, 0, "<tr><td><i>Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
             ast_sockaddr_stringify_port(&http_desc.old_address));
   if (http_tls_cfg.enabled) {
      ast_str_append(&out, 0, "<tr><td><i>SSL Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
                ast_sockaddr_stringify_port(&https_desc.old_address));
   }
   ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
   for (v = get_vars; v; v = v->next) {
      ast_str_append(&out, 0, "<tr><td><i>Submitted GET Variable '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
   }
   ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");

   cookies = ast_http_get_cookies(headers);
   for (v = cookies; v; v = v->next) {
      ast_str_append(&out, 0, "<tr><td><i>Cookie '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
   }
   ast_variables_destroy(cookies);

   ast_str_append(&out, 0, "</table><center><font size=\"-1\"><i>Asterisk and Digium are registered trademarks of Digium, Inc.</i></font></center></body></html>\r\n");
   ast_http_send(ser, method, 200, NULL, NULL, out, 0, 0);
   return 0;
}

static struct ast_http_uri status_uri = {
   .callback = httpstatus_callback,
   .description = "Asterisk HTTP General Status",
   .uri = "httpstatus",
   .has_subtree = 0,
   .data = NULL,
   .key = __FILE__,
};

static struct ast_http_uri static_uri = {
   .callback = static_callback,
   .description = "Asterisk HTTP Static Delivery",
   .uri = "static",
   .has_subtree = 1,
   .data = NULL,
   .key= __FILE__,
};

enum http_private_flags {
   /*! TRUE if the HTTP request has a body. */
   HTTP_FLAG_HAS_BODY = (1 << 0),
   /*! TRUE if the HTTP request body has been read. */
   HTTP_FLAG_BODY_READ = (1 << 1),
   /*! TRUE if the HTTP request must close when completed. */
   HTTP_FLAG_CLOSE_ON_COMPLETION = (1 << 2),
};

/*! HTTP tcptls worker_fn private data. */
struct http_worker_private_data {
   /*! Body length or -1 if chunked.  Valid if HTTP_FLAG_HAS_BODY is TRUE. */
   int body_length;
   /*! HTTP body tracking flags */
   struct ast_flags flags;
};

void ast_http_send(struct ast_tcptls_session_instance *ser,
   enum ast_http_method method, int status_code, const char *status_title,
   struct ast_str *http_header, struct ast_str *out, int fd,
   unsigned int static_content)
{
   struct timeval now = ast_tvnow();
   struct ast_tm tm;
   char timebuf[80];
   char buf[256];
   int len;
   int content_length = 0;
   int close_connection;
   struct ast_str *server_header_field = ast_str_create(MAX_SERVER_NAME_LENGTH);
   int send_content;

   if (!ser || !server_header_field) {
      /* The connection is not open. */
      ast_free(http_header);
      ast_free(out);
      ast_free(server_header_field);
      return;
   }

   if(!ast_strlen_zero(http_server_name)) {
      ast_str_set(&server_header_field,
                   0,
                   "Server: %s\r\n",
                   http_server_name);
   }

   /*
    * We shouldn't be sending non-final status codes to this
    * function because we may close the connection before
    * returning.
    */
   ast_assert(200 <= status_code);

   if (session_keep_alive <= 0) {
      close_connection = 1;
   } else {
      struct http_worker_private_data *request;

      request = ser->private_data;
      if (!request
         || ast_test_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION)
         || ast_http_body_discard(ser)) {
         close_connection = 1;
      } else {
         close_connection = 0;
      }
   }

   ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&now, &tm, "GMT"));

   /* calc content length */
   if (out) {
      content_length += ast_str_strlen(out);
   }

   if (fd) {
      content_length += lseek(fd, 0, SEEK_END);
      lseek(fd, 0, SEEK_SET);
   }

   send_content = method != AST_HTTP_HEAD || status_code >= 400;

   /* send http header */
   if (ast_iostream_printf(ser->stream,
      "HTTP/1.1 %d %s\r\n"
      "%s"
      "Date: %s\r\n"
      "%s"
      "%s"
      "%s"
      "Content-Length: %d\r\n"
      "\r\n"
      "%s",
      status_code, status_title ? status_title : "OK",
      ast_str_buffer(server_header_field),
      timebuf,
      close_connection ? "Connection: close\r\n" : "",
      static_content ? "" : "Cache-Control: no-cache, no-store\r\n",
      http_header ? ast_str_buffer(http_header) : "",
      content_length,
      send_content && out && ast_str_strlen(out) ? ast_str_buffer(out) : ""
      ) <= 0) {
      ast_debug(1, "ast_iostream_printf() failed: %s\n", strerror(errno));
      close_connection = 1;
   } else if (send_content && fd) {
      /* send file content */
      while ((len = read(fd, buf, sizeof(buf))) > 0) {
         if (ast_iostream_write(ser->stream, buf, len) != len) {
            ast_debug(1, "ast_iostream_write() failed: %s\n", strerror(errno));
            close_connection = 1;
            break;
         }
      }
   }

   ast_free(http_header);
   ast_free(out);
   ast_free(server_header_field);

   if (close_connection) {
      ast_debug(1, "HTTP closing session.  status_code:%d\n", status_code);
      ast_tcptls_close_session_file(ser);
   } else {
      ast_debug(1, "HTTP keeping session open.  status_code:%d\n", status_code);
   }
}

void ast_http_create_response(struct ast_tcptls_session_instance *ser, int status_code,
   const char *status_title, struct ast_str *http_header_data, const char *text)
{
   char server_name[MAX_SERVER_NAME_LENGTH];
   struct ast_str *server_address = ast_str_create(MAX_SERVER_NAME_LENGTH);
   struct ast_str *out = ast_str_create(INITIAL_RESPONSE_BODY_BUFFER);

   if (!http_header_data || !server_address || !out) {
      ast_free(http_header_data);
      ast_free(server_address);
      ast_free(out);
      if (ser) {
         ast_debug(1, "HTTP closing session. OOM.\n");
         ast_tcptls_close_session_file(ser);
      }
      return;
   }

   if(!ast_strlen_zero(http_server_name)) {
      ast_xml_escape(http_server_name, server_name, sizeof(server_name));
      ast_str_set(&server_address,
                   0,
                   "<address>%s</address>\r\n",
                   server_name);
   }

   ast_str_set(&out,
               0,
               "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
               "<html><head>\r\n"
               "<title>%d %s</title>\r\n"
               "</head><body>\r\n"
               "<h1>%s</h1>\r\n"
               "<p>%s</p>\r\n"
               "<hr />\r\n"
               "%s"
               "</body></html>\r\n",
               status_code,
               status_title,
               status_title,
               text ? text : "",
               ast_str_buffer(server_address));

   ast_free(server_address);

   ast_http_send(ser,
                 AST_HTTP_UNKNOWN,
                 status_code,
                 status_title,
                 http_header_data,
                 out,
                 0,
                 0);
}

void ast_http_auth(struct ast_tcptls_session_instance *ser, const char *realm,
   const unsigned long nonce, const unsigned long opaque, int stale,
   const char *text)
{
   int status_code = 401;
   char *status_title = "Unauthorized";
   struct ast_str *http_header_data = ast_str_create(DEFAULT_RESPONSE_HEADER_LENGTH);

   if (http_header_data) {
      ast_str_set(&http_header_data,
                  0,
                  "WWW-authenticate: Digest algorithm=MD5, realm=\"%s\", nonce=\"%08lx\", qop=\"auth\", opaque=\"%08lx\"%s\r\n"
                  "Content-type: text/html\r\n",
                  realm ? realm : "Asterisk",
                  nonce,
                  opaque,
                  stale ? ", stale=true" : "");
   }

   ast_http_create_response(ser,
                            status_code,
                            status_title,
                            http_header_data,
                            text);
}

void ast_http_error(struct ast_tcptls_session_instance *ser, int status_code,
   const char *status_title, const char *text)
{
   struct ast_str *http_header_data = ast_str_create(DEFAULT_RESPONSE_HEADER_LENGTH);

   if (http_header_data) {
      ast_str_set(&http_header_data, 0, "Content-type: text/html\r\n");
   }

   ast_http_create_response(ser,
                            status_code,
                            status_title,
                            http_header_data,
                            text);
}

/*!
 * \brief Link the new uri into the list.
 *
 * They are sorted by length of
 * the string, not alphabetically. Duplicate entries are not replaced,
 * but the insertion order (using <= and not just <) makes sure that
 * more recent insertions hide older ones.
 * On a lookup, we just scan the list and stop at the first matching entry.
 */
int ast_http_uri_link(struct ast_http_uri *urih)
{
   struct ast_http_uri *uri;
   int len = strlen(urih->uri);

   AST_RWLIST_WRLOCK(&uris);

   urih->prefix = prefix;

   if ( AST_RWLIST_EMPTY(&uris) || strlen(AST_RWLIST_FIRST(&uris)->uri) <= len ) {
      AST_RWLIST_INSERT_HEAD(&uris, urih, entry);
      AST_RWLIST_UNLOCK(&uris);
      return 0;
   }

   AST_RWLIST_TRAVERSE(&uris, uri, entry) {
      if (AST_RWLIST_NEXT(uri, entry) &&
         strlen(AST_RWLIST_NEXT(uri, entry)->uri) <= len) {
         AST_RWLIST_INSERT_AFTER(&uris, uri, urih, entry);
         AST_RWLIST_UNLOCK(&uris);

         return 0;
      }
   }

   AST_RWLIST_INSERT_TAIL(&uris, urih, entry);

   AST_RWLIST_UNLOCK(&uris);

   return 0;
}

void ast_http_uri_unlink(struct ast_http_uri *urih)
{
   AST_RWLIST_WRLOCK(&uris);
   AST_RWLIST_REMOVE(&uris, urih, entry);
   AST_RWLIST_UNLOCK(&uris);
}

void ast_http_uri_unlink_all_with_key(const char *key)
{
   struct ast_http_uri *urih;
   AST_RWLIST_WRLOCK(&uris);
   AST_RWLIST_TRAVERSE_SAFE_BEGIN(&uris, urih, entry) {
      if (!strcmp(urih->key, key)) {
         AST_RWLIST_REMOVE_CURRENT(entry);
         if (urih->dmallocd) {
            ast_free(urih->data);
         }
         if (urih->mallocd) {
            ast_free(urih);
         }
      }
   }
   AST_RWLIST_TRAVERSE_SAFE_END;
   AST_RWLIST_UNLOCK(&uris);
}

/*!
 * \brief Retrieves the header with the given field name.
 *
 * \param headers Headers to search.
 * \param field_name Name of the header to find.
 * \return Associated header value.
 * \return \c NULL if header is not present.
 */
static const char *get_header(struct ast_variable *headers, const char *field_name)
{
   struct ast_variable *v;

   for (v = headers; v; v = v->next) {
      if (!strcasecmp(v->name, field_name)) {
         return v->value;
      }
   }
   return NULL;
}

/*!
 * \brief Retrieves the content type specified in the "Content-Type" header.
 *
 * This function only returns the "type/subtype" and any trailing parameter is
 * not included.
 *
 * \note the return value is an allocated string that needs to be freed.
 *
 * \retval the content type/subtype or NULL if the header is not found.
 */
static char *get_content_type(struct ast_variable *headers)
{
   const char *content_type = get_header(headers, "Content-Type");
   const char *param;
   size_t size;

   if (!content_type) {
      return NULL;
   }

   param = strchr(content_type, ';');
   size = param ? param - content_type : strlen(content_type);

   return ast_strndup(content_type, size);
}

/*!
 * \brief Returns the value of the Content-Length header.
 *
 * \param headers HTTP headers.
 *
 * \retval length Value of the Content-Length header.
 * \retval 0 if header is not present.
 * \retval -1 if header is invalid.
 */
static int get_content_length(struct ast_variable *headers)
{
   const char *content_length = get_header(headers, "Content-Length");
   int length;

   if (!content_length) {
      /* Missing content length; assume zero */
      return 0;
   }

   length = 0;
   if (sscanf(content_length, "%30d", &length) != 1) {
      /* Invalid Content-Length value */
      length = -1;
   }
   return length;
}

/*!
 * \brief Returns the value of the Transfer-Encoding header.
 *
 * \param headers HTTP headers.
 * \retval string Value of the Transfer-Encoding header.
 * \retval NULL if header is not present.
 */
static const char *get_transfer_encoding(struct ast_variable *headers)
{
   return get_header(headers, "Transfer-Encoding");
}

/*!
 * \internal
 * \brief Determine if the HTTP peer wants the connection closed.
 *
 * \param headers List of HTTP headers
 *
 * \retval 0 keep connection open.
 * \retval -1 close connection.
 */
static int http_check_connection_close(struct ast_variable *headers)
{
   const char *connection = get_header(headers, "Connection");
   int close_connection = 0;

   if (connection && !strcasecmp(connection, "close")) {
      close_connection = -1;
   }
   return close_connection;
}

void ast_http_request_close_on_completion(struct ast_tcptls_session_instance *ser)
{
   struct http_worker_private_data *request = ser->private_data;

   ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
}

/*!
 * \internal
 * \brief Initialize the request tracking information in case of early failure.
 * \since 12.4.0
 *
 * \param request Request tracking information.
 *
 * \return Nothing
 */
static void http_request_tracking_init(struct http_worker_private_data *request)
{
   ast_set_flags_to(&request->flags,
      HTTP_FLAG_HAS_BODY | HTTP_FLAG_BODY_READ | HTTP_FLAG_CLOSE_ON_COMPLETION,
      /* Assume close in case request fails early */
      HTTP_FLAG_CLOSE_ON_COMPLETION);
}

/*!
 * \internal
 * \brief Setup the HTTP request tracking information.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 * \param headers List of HTTP headers.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int http_request_tracking_setup(struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
{
   struct http_worker_private_data *request = ser->private_data;
   const char *transfer_encoding;

   ast_set_flags_to(&request->flags,
      HTTP_FLAG_HAS_BODY | HTTP_FLAG_BODY_READ | HTTP_FLAG_CLOSE_ON_COMPLETION,
      http_check_connection_close(headers) ? HTTP_FLAG_CLOSE_ON_COMPLETION : 0);

   transfer_encoding = get_transfer_encoding(headers);
   if (transfer_encoding && !strcasecmp(transfer_encoding, "chunked")) {
      request->body_length = -1;
      ast_set_flag(&request->flags, HTTP_FLAG_HAS_BODY);
      return 0;
   }

   request->body_length = get_content_length(headers);
   if (0 < request->body_length) {
      ast_set_flag(&request->flags, HTTP_FLAG_HAS_BODY);
   } else if (request->body_length < 0) {
      /* Invalid Content-Length */
      ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
      ast_http_error(ser, 400, "Bad Request", "Invalid Content-Length in request!");
      return -1;
   }
   return 0;
}

void ast_http_body_read_status(struct ast_tcptls_session_instance *ser, int read_success)
{
   struct http_worker_private_data *request;

   request = ser->private_data;
   if (!ast_test_flag(&request->flags, HTTP_FLAG_HAS_BODY)
      || ast_test_flag(&request->flags, HTTP_FLAG_BODY_READ)) {
      /* No body to read. */
      return;
   }
   ast_set_flag(&request->flags, HTTP_FLAG_BODY_READ);
   if (!read_success) {
      ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
   }
}

/*!
 * \internal
 * \brief Read the next length bytes from the HTTP body.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 * \param buf Where to put the contents reading.
 * \param length How much contents to read.
 * \param what_getting Name of the contents reading.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int http_body_read_contents(struct ast_tcptls_session_instance *ser, char *buf, int length, const char *what_getting)
{
   int res;
   int total = 0;

   /* Stream is in exclusive mode so we get it all if possible. */
   while (total != length) {
      res = ast_iostream_read(ser->stream, buf + total, length - total);
      if (res <= 0) {
         break;
      }

      total += res;
   }

   if (total != length) {
      ast_log(LOG_WARNING, "Wrong HTTP content read. Request %s (Wanted %d, Read %d)\n",
         what_getting, length, res);
      return -1;
   }

   return 0;
}

/*!
 * \internal
 * \brief Read and discard the next length bytes from the HTTP body.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 * \param length How much contents to discard
 * \param what_getting Name of the contents discarding.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int http_body_discard_contents(struct ast_tcptls_session_instance *ser, int length, const char *what_getting)
{
   ssize_t res;

   res = ast_iostream_discard(ser->stream, length);
   if (res < length) {
      ast_log(LOG_WARNING, "Short HTTP request %s (Wanted %d but got %zd)\n",
         what_getting, length, res);
      return -1;
   }
   return 0;
}

/*!
 * \internal
 * \brief decode chunked mode hexadecimal value
 *
 * \param s string to decode
 * \param len length of string
 *
 * \retval length on success.
 * \retval -1 on error.
 */
static int chunked_atoh(const char *s, int len)
{
   int value = 0;
   char c;

   if (*s < '0') {
      /* zero value must be 0\n not just \n */
      return -1;
   }

   while (len--) {
      c = *s++;
      if (c == '\x0D') {
         return value;
      }
      if (c == ';') {
         /* We have a chunk-extension that we don't care about. */
         while (len--) {
            if (*s++ == '\x0D') {
               return value;
            }
         }
         break;
      }
      value <<= 4;
      if (c >= '0' && c <= '9') {
         value += c - '0';
         continue;
      }
      if (c >= 'a' && c <= 'f') {
         value += 10 + c - 'a';
         continue;
      }
      if (c >= 'A' && c <= 'F') {
         value += 10 + c - 'A';
         continue;
      }
      /* invalid character */
      return -1;
   }
   /* end of string */
   return -1;
}

/*!
 * \internal
 * \brief Read and convert the chunked body header length.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 *
 * \retval length Size of chunk to expect.
 * \retval -1 on error.
 */
static int http_body_get_chunk_length(struct ast_tcptls_session_instance *ser)
{
   int length;
   char header_line[MAX_HTTP_LINE_LENGTH];

   /* get the line of hexadecimal giving chunk-size w/ optional chunk-extension */
   if (ast_iostream_gets(ser->stream, header_line, sizeof(header_line)) <= 0) {
      ast_log(LOG_WARNING, "Short HTTP read of chunked header\n");
      return -1;
   }
   length = chunked_atoh(header_line, strlen(header_line));
   if (length < 0) {
      ast_log(LOG_WARNING, "Invalid HTTP chunk size\n");
      return -1;
   }
   return length;
}

/*!
 * \internal
 * \brief Read and check the chunk contents line termination.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int http_body_check_chunk_sync(struct ast_tcptls_session_instance *ser)
{
   int res;
   char chunk_sync[2];

   /* Stay in fread until get the expected CRLF or timeout. */
   res = ast_iostream_read(ser->stream, chunk_sync, sizeof(chunk_sync));
   if (res < sizeof(chunk_sync)) {
      ast_log(LOG_WARNING, "Short HTTP chunk sync read (Wanted %zu)\n",
         sizeof(chunk_sync));
      return -1;
   }
   if (chunk_sync[0] != 0x0D || chunk_sync[1] != 0x0A) {
      ast_log(LOG_WARNING, "HTTP chunk sync bytes wrong (0x%02hhX, 0x%02hhX)\n",
         (unsigned char) chunk_sync[0], (unsigned char) chunk_sync[1]);
      return -1;
   }

   return 0;
}

/*!
 * \internal
 * \brief Read and discard any chunked trailer entity-header lines.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int http_body_discard_chunk_trailer_headers(struct ast_tcptls_session_instance *ser)
{
   char header_line[MAX_HTTP_LINE_LENGTH];

   for (;;) {
      if (ast_iostream_gets(ser->stream, header_line, sizeof(header_line)) <= 0) {
         ast_log(LOG_WARNING, "Short HTTP read of chunked trailer header\n");
         return -1;
      }

      /* Trim trailing whitespace */
      ast_trim_blanks(header_line);
      if (ast_strlen_zero(header_line)) {
         /* A blank line ends the chunked-body */
         break;
      }
   }
   return 0;
}

int ast_http_body_discard(struct ast_tcptls_session_instance *ser)
{
   struct http_worker_private_data *request;

   request = ser->private_data;
   if (!ast_test_flag(&request->flags, HTTP_FLAG_HAS_BODY)
      || ast_test_flag(&request->flags, HTTP_FLAG_BODY_READ)) {
      /* No body to read or it has already been read. */
      return 0;
   }
   ast_set_flag(&request->flags, HTTP_FLAG_BODY_READ);

   ast_debug(1, "HTTP discarding unused request body\n");

   ast_assert(request->body_length != 0);
   if (0 < request->body_length) {
      if (http_body_discard_contents(ser, request->body_length, "body")) {
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         return -1;
      }
      return 0;
   }

   /* parse chunked-body */
   for (;;) {
      int length;

      length = http_body_get_chunk_length(ser);
      if (length < 0) {
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         return -1;
      }
      if (length == 0) {
         /* parsed last-chunk */
         break;
      }

      if (http_body_discard_contents(ser, length, "chunk-data")
         || http_body_check_chunk_sync(ser)) {
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         return -1;
      }
   }

   /* Read and discard any trailer entity-header lines. */
   if (http_body_discard_chunk_trailer_headers(ser)) {
      ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
      return -1;
   }
   return 0;
}

/*!
 * \brief Returns the contents (body) of the HTTP request
 *
 * \param return_length ptr to int that returns content length
 * \param ser HTTP TCP/TLS session object
 * \param headers List of HTTP headers
 * \return ptr to content (zero terminated) or NULL on failure
 * \note Since returned ptr is malloc'd, it should be free'd by caller
 */
static char *ast_http_get_contents(int *return_length,
   struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
{
   struct http_worker_private_data *request;
   int content_length;
   int bufsize;
   char *buf;

   request = ser->private_data;
   if (!ast_test_flag(&request->flags, HTTP_FLAG_HAS_BODY)) {
      /* no content - not an error */
      return NULL;
   }
   if (ast_test_flag(&request->flags, HTTP_FLAG_BODY_READ)) {
      /* Already read the body.  Cannot read again.  Assume no content. */
      ast_assert(0);
      return NULL;
   }
   ast_set_flag(&request->flags, HTTP_FLAG_BODY_READ);

   ast_debug(2, "HTTP consuming request body\n");

   ast_assert(request->body_length != 0);
   if (0 < request->body_length) {
      /* handle regular non-chunked content */
      content_length = request->body_length;
      if (content_length > MAX_CONTENT_LENGTH) {
         ast_log(LOG_WARNING, "Excessively long HTTP content. (%d > %d)\n",
            content_length, MAX_CONTENT_LENGTH);
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         errno = EFBIG;
         return NULL;
      }
      buf = ast_malloc(content_length + 1);
      if (!buf) {
         /* Malloc sets ENOMEM */
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         return NULL;
      }

      if (http_body_read_contents(ser, buf, content_length, "body")) {
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         errno = EIO;
         ast_free(buf);
         return NULL;
      }

      buf[content_length] = 0;
      *return_length = content_length;
      return buf;
   }

   /* pre-allocate buffer */
   bufsize = 250;
   buf = ast_malloc(bufsize);
   if (!buf) {
      ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
      return NULL;
   }

   /* parse chunked-body */
   content_length = 0;
   for (;;) {
      int chunk_length;

      chunk_length = http_body_get_chunk_length(ser);
      if (chunk_length < 0) {
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         errno = EIO;
         ast_free(buf);
         return NULL;
      }
      if (chunk_length == 0) {
         /* parsed last-chunk */
         break;
      }
      if (content_length + chunk_length > MAX_CONTENT_LENGTH) {
         ast_log(LOG_WARNING,
            "Excessively long HTTP accumulated chunked body. (%d + %d > %d)\n",
            content_length, chunk_length, MAX_CONTENT_LENGTH);
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         errno = EFBIG;
         ast_free(buf);
         return NULL;
      }

      /* insure buffer is large enough +1 */
      if (content_length + chunk_length >= bufsize) {
         char *new_buf;

         /* Increase bufsize until it can handle the expected data. */
         do {
            bufsize *= 2;
         } while (content_length + chunk_length >= bufsize);

         new_buf = ast_realloc(buf, bufsize);
         if (!new_buf) {
            ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
            ast_free(buf);
            return NULL;
         }
         buf = new_buf;
      }

      if (http_body_read_contents(ser, buf + content_length, chunk_length, "chunk-data")
         || http_body_check_chunk_sync(ser)) {
         ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
         errno = EIO;
         ast_free(buf);
         return NULL;
      }
      content_length += chunk_length;
   }

   /*
    * Read and discard any trailer entity-header lines
    * which we don't care about.
    *
    * XXX In the future we may need to add the trailer headers
    * to the passed in headers list rather than discarding them.
    */
   if (http_body_discard_chunk_trailer_headers(ser)) {
      ast_set_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION);
      errno = EIO;
      ast_free(buf);
      return NULL;
   }

   buf[content_length] = 0;
   *return_length = content_length;
   return buf;
}

struct ast_json *ast_http_get_json(
   struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
{
   int content_length = 0;
   struct ast_json *body;
   RAII_VAR(char *, buf, NULL, ast_free);
   RAII_VAR(char *, type, get_content_type(headers), ast_free);

   /* Use errno to distinguish errors from no body */
   errno = 0;

   if (ast_strlen_zero(type) || strcasecmp(type, "application/json")) {
      /* Content type is not JSON.  Don't read the body. */
      return NULL;
   }

   buf = ast_http_get_contents(&content_length, ser, headers);
   if (!buf || !content_length) {
      /*
       * errno already set
       * or it is not an error to have zero content
       */
      return NULL;
   }

   body = ast_json_load_buf(buf, content_length, NULL);
   if (!body) {
      /* Failed to parse JSON; treat as an I/O error */
      errno = EIO;
      return NULL;
   }

   return body;
}

/*
 * get post variables from client Request Entity-Body, if content type is
 * application/x-www-form-urlencoded
 */
struct ast_variable *ast_http_get_post_vars(
   struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
{
   int content_length = 0;
   struct ast_variable *v, *post_vars=NULL, *prev = NULL;
   char *var, *val;
   RAII_VAR(char *, buf, NULL, ast_free);
   RAII_VAR(char *, type, get_content_type(headers), ast_free);

   /* Use errno to distinguish errors from no params */
   errno = 0;

   if (ast_strlen_zero(type) ||
       strcasecmp(type, "application/x-www-form-urlencoded")) {
      /* Content type is not form data.  Don't read the body. */
      return NULL;
   }

   buf = ast_http_get_contents(&content_length, ser, headers);
   if (!buf || !content_length) {
      /*
       * errno already set
       * or it is not an error to have zero content
       */
      return NULL;
   }

   while ((val = strsep(&buf, "&"))) {
      var = strsep(&val, "=");
      if (val) {
         ast_uri_decode(val, ast_uri_http_legacy);
      } else  {
         val = "";
      }
      ast_uri_decode(var, ast_uri_http_legacy);
      if ((v = ast_variable_new(var, val, ""))) {
         if (post_vars) {
            prev->next = v;
         } else {
            post_vars = v;
         }
         prev = v;
      }
   }

   return post_vars;
}

static int handle_uri(struct ast_tcptls_session_instance *ser, char *uri,
   enum ast_http_method method, struct ast_variable *headers)
{
   char *c;
   int res = 0;
   char *params = uri;
   struct ast_http_uri *urih = NULL;
   int l;
   struct ast_variable *get_vars = NULL, *v, *prev = NULL;
   struct http_uri_redirect *redirect;

   ast_debug(2, "HTTP Request URI is %s \n", uri);

   strsep(&params, "?");
   /* Extract arguments from the request and store them in variables. */
   if (params) {
      char *var, *val;

      while ((val = strsep(&params, "&"))) {
         var = strsep(&val, "=");
         if (val) {
            ast_uri_decode(val, ast_uri_http_legacy);
         } else  {
            val = "";
         }
         ast_uri_decode(var, ast_uri_http_legacy);
         if ((v = ast_variable_new(var, val, ""))) {
            if (get_vars) {
               prev->next = v;
            } else {
               get_vars = v;
            }
            prev = v;
         }
      }
   }

   AST_RWLIST_RDLOCK(&uri_redirects);
   AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry) {
      if (!strcasecmp(uri, redirect->target)) {
         struct ast_str *http_header = ast_str_create(128);

         if (!http_header) {
            ast_http_request_close_on_completion(ser);
            ast_http_error(ser, 500, "Server Error", "Out of memory");
            break;
         }
         ast_str_set(&http_header, 0, "Location: %s\r\n", redirect->dest);
         ast_http_send(ser, method, 302, "Moved Temporarily", http_header, NULL, 0, 0);
         break;
      }
   }
   AST_RWLIST_UNLOCK(&uri_redirects);
   if (redirect) {
      goto cleanup;
   }

   /* We want requests to start with the (optional) prefix and '/' */
   l = strlen(prefix);
   if (!strncasecmp(uri, prefix, l) && uri[l] == '/') {
      uri += l + 1;
      /* scan registered uris to see if we match one. */
      AST_RWLIST_RDLOCK(&uris);
      AST_RWLIST_TRAVERSE(&uris, urih, entry) {
         l = strlen(urih->uri);
         c = uri + l;   /* candidate */
         ast_debug(2, "match request [%s] with handler [%s] len %d\n", uri, urih->uri, l);
         if (strncasecmp(urih->uri, uri, l) /* no match */
             || (*c && *c != '/')) { /* substring */
            continue;
         }
         if (*c == '/') {
            c++;
         }
         if (!*c || urih->has_subtree) {
            uri = c;
            break;
         }
      }
      AST_RWLIST_UNLOCK(&uris);
   }
   if (urih) {
      ast_debug(1, "Match made with [%s]\n", urih->uri);
      if (!urih->no_decode_uri) {
         ast_uri_decode(uri, ast_uri_http_legacy);
      }
      res = urih->callback(ser, urih, uri, method, get_vars, headers);
   } else {
      ast_debug(1, "Requested URI [%s] has no handler\n", uri);
      ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
   }

cleanup:
   ast_variables_destroy(get_vars);
   return res;
}

static struct ast_variable *parse_cookies(const char *cookies)
{
   char *parse = ast_strdupa(cookies);
   char *cur;
   struct ast_variable *vars = NULL, *var;

   while ((cur = strsep(&parse, ";"))) {
      char *name, *val;

      name = val = cur;
      strsep(&val, "=");

      if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
         continue;
      }

      name = ast_strip(name);
      val = ast_strip_quoted(val, "\"", "\"");

      if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
         continue;
      }

      ast_debug(1, "HTTP Cookie, Name: '%s'  Value: '%s'\n", name, val);

      var = ast_variable_new(name, val, __FILE__);
      var->next = vars;
      vars = var;
   }

   return vars;
}

/* get cookie from Request headers */
struct ast_variable *ast_http_get_cookies(struct ast_variable *headers)
{
   struct ast_variable *v, *cookies = NULL;

   for (v = headers; v; v = v->next) {
      if (!strcasecmp(v->name, "Cookie")) {
         ast_variables_destroy(cookies);
         cookies = parse_cookies(v->value);
      }
   }
   return cookies;
}

static struct ast_http_auth *auth_create(const char *userid, const char *password)
{
   struct ast_http_auth *auth;
   size_t userid_len;
   size_t password_len;

   if (!userid || !password) {
      ast_log(LOG_ERROR, "Invalid userid/password\n");
      return NULL;
   }

   userid_len = strlen(userid) + 1;
   password_len = strlen(password) + 1;

   /* Allocate enough room to store everything in one memory block */
   auth = ao2_alloc(sizeof(*auth) + userid_len + password_len, NULL);
   if (!auth) {
      return NULL;
   }

   /* Put the userid right after the struct */
   auth->userid = (char *)(auth + 1);
   strcpy(auth->userid, userid);

   /* Put the password right after the userid */
   auth->password = auth->userid + userid_len;
   strcpy(auth->password, password);

   return auth;
}

#define BASIC_PREFIX "Basic "
#define BASIC_LEN 6 /*!< strlen(BASIC_PREFIX) */

struct ast_http_auth *ast_http_get_auth(struct ast_variable *headers)
{
   struct ast_variable *v;

   for (v = headers; v; v = v->next) {
      const char *base64;
      char decoded[256] = {};
      char *username;
      char *password;
#ifdef AST_DEVMODE
      int cnt;
#endif /* AST_DEVMODE */

      if (strcasecmp("Authorization", v->name) != 0) {
         continue;
      }

      if (!ast_begins_with(v->value, BASIC_PREFIX)) {
         ast_log(LOG_DEBUG,
            "Unsupported Authorization scheme\n");
         continue;
      }

      /* Basic auth header parsing. RFC 2617, section 2.
       *   credentials = "Basic" basic-credentials
       *   basic-credentials = base64-user-pass
       *   base64-user-pass  = <base64 encoding of user-pass,
       *                        except not limited to 76 char/line>
       *   user-pass   = userid ":" password
       */

      base64 = v->value + BASIC_LEN;

      /* This will truncate "userid:password" lines to
       * sizeof(decoded). The array is long enough that this shouldn't
       * be a problem */
#ifdef AST_DEVMODE
      cnt =
#endif /* AST_DEVMODE */
      ast_base64decode((unsigned char*)decoded, base64,
         sizeof(decoded) - 1);
      ast_assert(cnt < sizeof(decoded));

      /* Split the string at the colon */
      password = decoded;
      username = strsep(&password, ":");
      if (!password) {
         ast_log(LOG_WARNING, "Invalid Authorization header\n");
         return NULL;
      }

      return auth_create(username, password);
   }

   return NULL;
}

int ast_http_response_status_line(const char *buf, const char *version, int code)
{
   int status_code;
   size_t size = strlen(version);

   if (strncmp(buf, version, size) || buf[size] != ' ') {
      ast_log(LOG_ERROR, "HTTP version not supported - "
         "expected %s\n", version);
      return -1;
   }

   /* skip to status code (version + space) */
   buf += size + 1;

   if (sscanf(buf, "%d", &status_code) != 1) {
      ast_log(LOG_ERROR, "Could not read HTTP status code - "
         "%s\n", buf);
      return -1;
   }

   return status_code;
}

static void remove_excess_lws(char *s)
{
   char *p, *res = s;
   char *buf = ast_malloc(strlen(s) + 1);
   char *buf_end;

   if (!buf) {
      return;
   }

   buf_end = buf;

   while (*s && *(s = ast_skip_blanks(s))) {
      p = s;
      s = ast_skip_nonblanks(s);

      if (buf_end != buf) {
         *buf_end++ = ' ';
      }

      memcpy(buf_end, p, s - p);
      buf_end += s - p;
   }
   *buf_end = '\0';
   /* safe since buf will always be less than or equal to res */
   strcpy(res, buf);
   ast_free(buf);
}

int ast_http_header_parse(char *buf, char **name, char **value)
{
   ast_trim_blanks(buf);
   if (ast_strlen_zero(buf)) {
      return -1;
   }

   *value = buf;
   *name = strsep(value, ":");
   if (!*value) {
      return 1;
   }

   *value = ast_skip_blanks(*value);
   if (ast_strlen_zero(*value) || ast_strlen_zero(*name)) {
      return 1;
   }

   remove_excess_lws(*value);
   return 0;
}

int ast_http_header_match(const char *name, const char *expected_name,
           const char *value, const char *expected_value)
{
   if (strcasecmp(name, expected_name)) {
      /* no value to validate if names don't match */
      return 0;
   }

   if (strcasecmp(value, expected_value)) {
      ast_log(LOG_ERROR, "Invalid header value - expected %s "
         "received %s", value, expected_value);
      return -1;
   }
   return 1;
}

int ast_http_header_match_in(const char *name, const char *expected_name,
              const char *value, const char *expected_value)
{
   if (strcasecmp(name, expected_name)) {
      /* no value to validate if names don't match */
      return 0;
   }

   if (!strcasestr(expected_value, value)) {
      ast_log(LOG_ERROR, "Header '%s' - could not locate '%s' "
         "in '%s'\n", name, value, expected_value);
      return -1;

   }
   return 1;
}

/*! Limit the number of request headers in case the sender is being ridiculous. */
#define MAX_HTTP_REQUEST_HEADERS 100

/*!
 * \internal
 * \brief Read the request headers.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 * \param headers Where to put the request headers list pointer.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int http_request_headers_get(struct ast_tcptls_session_instance *ser, struct ast_variable **headers)
{
   struct ast_variable *tail = *headers;
   int remaining_headers;
   char header_line[MAX_HTTP_LINE_LENGTH];

   remaining_headers = MAX_HTTP_REQUEST_HEADERS;
   for (;;) {
      ssize_t len;
      char *name;
      char *value;

      len = ast_iostream_gets(ser->stream, header_line, sizeof(header_line));
      if (len <= 0) {
         ast_http_error(ser, 400, "Bad Request", "Timeout");
         return -1;
      }
      if (header_line[len - 1] != '\n') {
         /* We didn't get a full line */
         ast_http_error(ser, 400, "Bad Request",
            (len == sizeof(header_line) - 1) ? "Header line too long" : "Timeout");
         return -1;
      }

      /* Trim trailing characters */
      ast_trim_blanks(header_line);
      if (ast_strlen_zero(header_line)) {
         /* A blank line ends the request header section. */
         break;
      }

      value = header_line;
      name = strsep(&value, ":");
      if (!value) {
         continue;
      }

      value = ast_skip_blanks(value);
      if (ast_strlen_zero(value) || ast_strlen_zero(name)) {
         continue;
      }

      ast_trim_blanks(name);

      if (!remaining_headers--) {
         /* Too many headers. */
         ast_http_error(ser, 413, "Request Entity Too Large", "Too many headers");
         return -1;
      }
      if (!*headers) {
         *headers = ast_variable_new(name, value, __FILE__);
         tail = *headers;
      } else {
         tail->next = ast_variable_new(name, value, __FILE__);
         tail = tail->next;
      }
      if (!tail) {
         /*
          * Variable allocation failure.
          * Try to make some room.
          */
         ast_variables_destroy(*headers);
         *headers = NULL;

         ast_http_error(ser, 500, "Server Error", "Out of memory");
         return -1;
      }
   }

   return 0;
}

/*!
 * \internal
 * \brief Process a HTTP request.
 * \since 12.4.0
 *
 * \param ser HTTP TCP/TLS session object.
 *
 * \retval 0 Continue and process the next HTTP request.
 * \retval -1 Fatal HTTP connection error.  Force the HTTP connection closed.
 */
static int httpd_process_request(struct ast_tcptls_session_instance *ser)
{
   RAII_VAR(struct ast_variable *, headers, NULL, ast_variables_destroy);
   char *uri;
   char *method;
   const char *transfer_encoding;
   struct http_worker_private_data *request;
   enum ast_http_method http_method = AST_HTTP_UNKNOWN;
   int res;
   ssize_t len;
   char request_line[MAX_HTTP_LINE_LENGTH];

   len = ast_iostream_gets(ser->stream, request_line, sizeof(request_line));
   if (len <= 0) {
      return -1;
   }

   /* Re-initialize the request body tracking data. */
   request = ser->private_data;
   http_request_tracking_init(request);

   if (request_line[len - 1] != '\n') {
      /* We didn't get a full line */
      ast_http_error(ser, 400, "Bad Request",
         (len == sizeof(request_line) - 1) ? "Request line too long" : "Timeout");
      return -1;
   }

   /* Get method */
   method = ast_skip_blanks(request_line);
   uri = ast_skip_nonblanks(method);
   if (*uri) {
      *uri++ = '\0';
   }

   if (!strcasecmp(method,"GET")) {
      http_method = AST_HTTP_GET;
   } else if (!strcasecmp(method,"POST")) {
      http_method = AST_HTTP_POST;
   } else if (!strcasecmp(method,"HEAD")) {
      http_method = AST_HTTP_HEAD;
   } else if (!strcasecmp(method,"PUT")) {
      http_method = AST_HTTP_PUT;
   } else if (!strcasecmp(method,"DELETE")) {
      http_method = AST_HTTP_DELETE;
   } else if (!strcasecmp(method,"OPTIONS")) {
      http_method = AST_HTTP_OPTIONS;
   }

   uri = ast_skip_blanks(uri);   /* Skip white space */
   if (*uri) {       /* terminate at the first blank */
      char *c = ast_skip_nonblanks(uri);

      if (*c) {
         *c = '\0';
      }
   } else {
      ast_http_error(ser, 400, "Bad Request", "Invalid Request");
      return -1;
   }

   if (ast_shutdown_final()) {
      ast_http_error(ser, 503, "Service Unavailable", "Shutdown in progress");
      return -1;
   }

   /* process "Request Headers" lines */
   if (http_request_headers_get(ser, &headers)) {
      return -1;
   }

   transfer_encoding = get_transfer_encoding(headers);
   /* Transfer encoding defaults to identity */
   if (!transfer_encoding) {
      transfer_encoding = "identity";
   }

   /*
    * RFC 2616, section 3.6, we should respond with a 501 for any transfer-
    * codings we don't understand.
    */
   if (strcasecmp(transfer_encoding, "identity") != 0 &&
      strcasecmp(transfer_encoding, "chunked") != 0) {
      /* Transfer encodings not supported */
      ast_http_error(ser, 501, "Unimplemented", "Unsupported Transfer-Encoding.");
      return -1;
   }

   if (http_request_tracking_setup(ser, headers)
      || handle_uri(ser, uri, http_method, headers)
      || ast_test_flag(&request->flags, HTTP_FLAG_CLOSE_ON_COMPLETION)) {
      res = -1;
   } else {
      res = 0;
   }
   return res;
}

static void *httpd_helper_thread(void *data)
{
   struct ast_tcptls_session_instance *ser = data;
   int timeout;
   int arg = 1;

   if (!ser) {
      ao2_cleanup(ser);
      return NULL;
   }

   if (ast_atomic_fetchadd_int(&session_count, +1) >= session_limit) {
      ast_log(LOG_WARNING, "HTTP session count exceeded %d sessions.\n",
         session_limit);
      goto done;
   }
   ast_debug(1, "HTTP opening session.  Top level\n");

   /*
    * Here we set TCP_NODELAY on the socket to disable Nagle's algorithm.
    * This is necessary to prevent delays (caused by buffering) as we
    * write to the socket in bits and pieces.
    */
   if (setsockopt(ast_iostream_get_fd(ser->stream), IPPROTO_TCP, TCP_NODELAY, (char *) &arg, sizeof(arg)) < 0) {
      ast_log(LOG_WARNING, "Failed to set TCP_NODELAY on HTTP connection: %s\n", strerror(errno));
   }
   ast_iostream_nonblock(ser->stream);

   /* Setup HTTP worker private data to keep track of request body reading. */
   ao2_cleanup(ser->private_data);
   ser->private_data = ao2_alloc_options(sizeof(struct http_worker_private_data), NULL,
      AO2_ALLOC_OPT_LOCK_NOLOCK);
   if (!ser->private_data) {
      ast_http_error(ser, 500, "Server Error", "Out of memory");
      goto done;
   }
   http_request_tracking_init(ser->private_data);

   /* Determine initial HTTP request wait timeout. */
   timeout = session_keep_alive;
   if (timeout <= 0) {
      /* Persistent connections not enabled. */
      timeout = session_inactivity;
   }
   if (timeout < MIN_INITIAL_REQUEST_TIMEOUT) {
      timeout = MIN_INITIAL_REQUEST_TIMEOUT;
   }

   /* We can let the stream wait for data to arrive. */
   ast_iostream_set_exclusive_input(ser->stream, 1);

   for (;;) {
      /* Wait for next potential HTTP request message. */
      ast_iostream_set_timeout_idle_inactivity(ser->stream, timeout, session_inactivity);
      if (httpd_process_request(ser)) {
         /* Break the connection or the connection closed */
         break;
      }
      if (!ser->stream) {
         /* Web-socket or similar that took the connection */
         break;
      }

      timeout = session_keep_alive;
      if (timeout <= 0) {
         /* Persistent connections not enabled. */
         break;
      }
   }

done:
   ast_atomic_fetchadd_int(&session_count, -1);

   ast_debug(1, "HTTP closing session.  Top level\n");
   ast_tcptls_close_session_file(ser);

   ao2_ref(ser, -1);
   return NULL;
}

/*!
 * \brief Add a new URI redirect
 * The entries in the redirect list are sorted by length, just like the list
 * of URI handlers.
 */
static void add_redirect(const char *value)
{
   char *target, *dest;
   struct http_uri_redirect *redirect, *cur;
   unsigned int target_len;
   unsigned int total_len;
   size_t dest_len;

   dest = ast_strdupa(value);
   dest = ast_skip_blanks(dest);
   target = strsep(&dest, " ");
   target = ast_skip_blanks(target);
   target = strsep(&target, " "); /* trim trailing whitespace */

   if (!dest) {
      ast_log(LOG_WARNING, "Invalid redirect '%s'\n", value);
      return;
   }

   target_len = strlen(target) + 1;
   dest_len = strlen(dest) + 1;
   total_len = sizeof(*redirect) + target_len + dest_len;

   if (!(redirect = ast_calloc(1, total_len))) {
      return;
   }
   redirect->dest = redirect->target + target_len;
   strcpy(redirect->target, target);
   ast_copy_string(redirect->dest, dest, dest_len);

   AST_RWLIST_WRLOCK(&uri_redirects);

   target_len--; /* So we can compare directly with strlen() */
   if (AST_RWLIST_EMPTY(&uri_redirects)
      || strlen(AST_RWLIST_FIRST(&uri_redirects)->target) <= target_len ) {
      AST_RWLIST_INSERT_HEAD(&uri_redirects, redirect, entry);
      AST_RWLIST_UNLOCK(&uri_redirects);

      return;
   }

   AST_RWLIST_TRAVERSE(&uri_redirects, cur, entry) {
      if (AST_RWLIST_NEXT(cur, entry)
         && strlen(AST_RWLIST_NEXT(cur, entry)->target) <= target_len ) {
         AST_RWLIST_INSERT_AFTER(&uri_redirects, cur, redirect, entry);
         AST_RWLIST_UNLOCK(&uri_redirects);
         return;
      }
   }

   AST_RWLIST_INSERT_TAIL(&uri_redirects, redirect, entry);

   AST_RWLIST_UNLOCK(&uri_redirects);
}

static int __ast_http_load(int reload)
{
   struct ast_config *cfg;
   struct ast_variable *v;
   int enabled = 0;
   int new_static_uri_enabled = 0;
   int new_status_uri_enabled = 1; /* Default to enabled for BC */
   char newprefix[MAX_PREFIX] = "";
   char server_name[MAX_SERVER_NAME_LENGTH];
   struct http_uri_redirect *redirect;
   struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
   uint32_t bindport = DEFAULT_PORT;
   RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
   int num_addrs = 0;
   int http_tls_was_enabled = 0;

   cfg = ast_config_load2("http.conf", "http", config_flags);
   if (!cfg || cfg == CONFIG_STATUS_FILEINVALID) {
      return 0;
   }

   /* Even if the http.conf hasn't been updated, the TLS certs/keys may have been */
   if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
      if (http_tls_cfg.enabled && ast_ssl_setup(https_desc.tls_cfg)) {
         ast_tcptls_server_start(&https_desc);
      }
      return 0;
   }

   http_tls_was_enabled = (reload && http_tls_cfg.enabled);

   http_tls_cfg.enabled = 0;

   ast_free(http_tls_cfg.certfile);
   http_tls_cfg.certfile = ast_strdup(AST_CERTFILE);

   ast_free(http_tls_cfg.capath);
   http_tls_cfg.capath = ast_strdup("");

   ast_free(http_tls_cfg.pvtfile);
   http_tls_cfg.pvtfile = ast_strdup("");

   /* Apply modern intermediate settings according to the Mozilla OpSec team as of July 30th, 2015 but disable TLSv1 */
   ast_set_flag(&http_tls_cfg.flags, AST_SSL_DISABLE_TLSV1 | AST_SSL_SERVER_CIPHER_ORDER);

   ast_free(http_tls_cfg.cipher);
   http_tls_cfg.cipher = ast_strdup("ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA");

   AST_RWLIST_WRLOCK(&uri_redirects);
   while ((redirect = AST_RWLIST_REMOVE_HEAD(&uri_redirects, entry))) {
      ast_free(redirect);
   }
   AST_RWLIST_UNLOCK(&uri_redirects);

   ast_sockaddr_setnull(&https_desc.local_address);

   session_limit = DEFAULT_SESSION_LIMIT;
   session_inactivity = DEFAULT_SESSION_INACTIVITY;
   session_keep_alive = DEFAULT_SESSION_KEEP_ALIVE;

   snprintf(server_name, sizeof(server_name), "Asterisk/%s", ast_get_version());

   v = ast_variable_browse(cfg, "general");
   for (; v; v = v->next) {
      /* read tls config options while preventing unsupported options from being set */
      if (strcasecmp(v->name, "tlscafile")
         && strcasecmp(v->name, "tlscapath")
         && strcasecmp(v->name, "tlscadir")
         && strcasecmp(v->name, "tlsverifyclient")
         && strcasecmp(v->name, "tlsdontverifyserver")
         && strcasecmp(v->name, "tlsclientmethod")
         && strcasecmp(v->name, "sslclientmethod")
         && !ast_tls_read_conf(&http_tls_cfg, &https_desc, v->name, v->value)) {
         continue;
      }

      if (!strcasecmp(v->name, "servername")) {
         if (!ast_strlen_zero(v->value)) {
            ast_copy_string(server_name, v->value, sizeof(server_name));
         } else {
            server_name[0] = '\0';
         }
      } else if (!strcasecmp(v->name, "enabled")) {
         enabled = ast_true(v->value);
      } else if (!strcasecmp(v->name, "enablestatic") || !strcasecmp(v->name, "enable_static")) {
         new_static_uri_enabled = ast_true(v->value);
      } else if (!strcasecmp(v->name, "enable_status")) {
         new_status_uri_enabled = ast_true(v->value);
      } else if (!strcasecmp(v->name, "bindport")) {
         if (ast_parse_arg(v->value, PARSE_UINT32 | PARSE_IN_RANGE | PARSE_DEFAULT,
            &bindport, DEFAULT_PORT, 0, 65535)) {
            ast_log(LOG_WARNING, "Invalid port %s specified. Using default port %" PRId32 "\n",
               v->value, DEFAULT_PORT);
         }
      } else if (!strcasecmp(v->name, "bindaddr")) {
         if (!(num_addrs = ast_sockaddr_resolve(&addrs, v->value, 0, AST_AF_UNSPEC))) {
            ast_log(LOG_WARNING, "Invalid bind address %s\n", v->value);
         }
      } else if (!strcasecmp(v->name, "prefix")) {
         if (!ast_strlen_zero(v->value)) {
            newprefix[0] = '/';
            ast_copy_string(newprefix + 1, v->value, sizeof(newprefix) - 1);
         } else {
            newprefix[0] = '\0';
         }
      } else if (!strcasecmp(v->name, "redirect")) {
         add_redirect(v->value);
      } else if (!strcasecmp(v->name, "sessionlimit")) {
         if (ast_parse_arg(v->value, PARSE_INT32 | PARSE_DEFAULT | PARSE_IN_RANGE,
            &session_limit, DEFAULT_SESSION_LIMIT, 1, INT_MAX)) {
            ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
               v->name, v->value, v->lineno);
         }
      } else if (!strcasecmp(v->name, "session_inactivity")) {
         if (ast_parse_arg(v->value, PARSE_INT32 | PARSE_DEFAULT | PARSE_IN_RANGE,
            &session_inactivity, DEFAULT_SESSION_INACTIVITY, 1, INT_MAX)) {
            ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
               v->name, v->value, v->lineno);
         }
      } else if (!strcasecmp(v->name, "session_keep_alive")) {
         if (sscanf(v->value, "%30d", &session_keep_alive) != 1
            || session_keep_alive < 0) {
            session_keep_alive = DEFAULT_SESSION_KEEP_ALIVE;
            ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
               v->name, v->value, v->lineno);
         }
      } else {
         ast_log(LOG_WARNING, "Ignoring unknown option '%s' in http.conf\n", v->name);
      }
   }

   ast_config_destroy(cfg);

   if (strcmp(prefix, newprefix)) {
      ast_copy_string(prefix, newprefix, sizeof(prefix));
   }

   ast_copy_string(http_server_name, server_name, sizeof(http_server_name));

   if (num_addrs && enabled) {
      int i;
      for (i = 0; i < num_addrs; ++i) {
         ast_sockaddr_copy(&http_desc.local_address, &addrs[i]);
         if (!ast_sockaddr_port(&http_desc.local_address)) {
            ast_sockaddr_set_port(&http_desc.local_address, bindport);
         }
         ast_tcptls_server_start(&http_desc);
         if (http_desc.accept_fd == -1) {
            ast_log(LOG_WARNING, "Failed to start HTTP server for address %s\n", ast_sockaddr_stringify(&addrs[i]));
            ast_sockaddr_setnull(&http_desc.local_address);
         } else {
            ast_verb(1, "Bound HTTP server to address %s\n", ast_sockaddr_stringify(&addrs[i]));
            break;
         }
      }
      /* When no specific TLS bindaddr is specified, we just use
       * the non-TLS bindaddress here.
       */
      if (ast_sockaddr_isnull(&https_desc.local_address) && http_desc.accept_fd != -1) {
         ast_sockaddr_copy(&https_desc.local_address, &http_desc.local_address);
         /* Of course, we can't use the same port though.
          * Since no bind address was specified, we just use the
          * default TLS port
          */
         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
      }
   }
   if (http_tls_was_enabled && !http_tls_cfg.enabled) {
      ast_tcptls_server_stop(&https_desc);
   } else if (http_tls_cfg.enabled && !ast_sockaddr_isnull(&https_desc.local_address)) {
      /* We can get here either because a TLS-specific address was specified
       * or because we copied the non-TLS address here. In the case where
       * we read an explicit address from the config, there may have been
       * no port specified, so we'll just use the default TLS port.
       */
      if (!ast_sockaddr_port(&https_desc.local_address)) {
         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
      }
      if (ast_ssl_setup(https_desc.tls_cfg)) {
         ast_tcptls_server_start(&https_desc);
      }
   }

   if (static_uri_enabled && !new_static_uri_enabled) {
      ast_http_uri_unlink(&static_uri);
   } else if (!static_uri_enabled && new_static_uri_enabled) {
      ast_http_uri_link(&static_uri);
   }

   static_uri_enabled = new_static_uri_enabled;

   if (status_uri_enabled && !new_status_uri_enabled) {
      ast_http_uri_unlink(&status_uri);
   } else if (!status_uri_enabled && new_status_uri_enabled) {
      ast_http_uri_link(&status_uri);
   }

   status_uri_enabled = new_status_uri_enabled;

   return 0;
}

static char *handle_show_http(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   struct ast_http_uri *urih;
   struct http_uri_redirect *redirect;

   switch (cmd) {
   case CLI_INIT:
      e->command = "http show status";
      e->usage =
         "Usage: http show status\n"
         "       Lists status of internal HTTP engine\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 3) {
      return CLI_SHOWUSAGE;
   }
   ast_cli(a->fd, "HTTP Server Status:\n");
   ast_cli(a->fd, "Prefix: %s\n", prefix);
   ast_cli(a->fd, "Server: %s\n", http_server_name);
   if (ast_sockaddr_isnull(&http_desc.old_address)) {
      ast_cli(a->fd, "Server Disabled\n\n");
   } else {
      ast_cli(a->fd, "Server Enabled and Bound to %s\n\n",
         ast_sockaddr_stringify(&http_desc.old_address));
      if (http_tls_cfg.enabled) {
         ast_cli(a->fd, "HTTPS Server Enabled and Bound to %s\n\n",
            ast_sockaddr_stringify(&https_desc.old_address));
      }
   }

   ast_cli(a->fd, "Enabled URI's:\n");
   AST_RWLIST_RDLOCK(&uris);
   if (AST_RWLIST_EMPTY(&uris)) {
      ast_cli(a->fd, "None.\n");
   } else {
      AST_RWLIST_TRAVERSE(&uris, urih, entry)
         ast_cli(a->fd, "%s/%s%s => %s\n", prefix, urih->uri, (urih->has_subtree ? "/..." : "" ), urih->description);
   }
   AST_RWLIST_UNLOCK(&uris);

   ast_cli(a->fd, "\nEnabled Redirects:\n");
   AST_RWLIST_RDLOCK(&uri_redirects);
   AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry)
      ast_cli(a->fd, "  %s => %s\n", redirect->target, redirect->dest);
   if (AST_RWLIST_EMPTY(&uri_redirects)) {
      ast_cli(a->fd, "  None.\n");
   }
   AST_RWLIST_UNLOCK(&uri_redirects);

   return CLI_SUCCESS;
}

static int reload_module(void)
{
   return __ast_http_load(1);
}

static struct ast_cli_entry cli_http[] = {
   AST_CLI_DEFINE(handle_show_http, "Display HTTP server status"),
};

static int unload_module(void)
{
   struct http_uri_redirect *redirect;
   ast_cli_unregister_multiple(cli_http, ARRAY_LEN(cli_http));

   ast_tcptls_server_stop(&http_desc);
   if (http_tls_cfg.enabled) {
      ast_tcptls_server_stop(&https_desc);
   }
   ast_free(http_tls_cfg.certfile);
   ast_free(http_tls_cfg.capath);
   ast_free(http_tls_cfg.pvtfile);
   ast_free(http_tls_cfg.cipher);

   if (status_uri_enabled) {
      ast_http_uri_unlink(&status_uri);
   }

   if (static_uri_enabled) {
      ast_http_uri_unlink(&static_uri);
   }

   AST_RWLIST_WRLOCK(&uri_redirects);
   while ((redirect = AST_RWLIST_REMOVE_HEAD(&uri_redirects, entry))) {
      ast_free(redirect);
   }
   AST_RWLIST_UNLOCK(&uri_redirects);

   return 0;
}

static int load_module(void)
{
   ast_cli_register_multiple(cli_http, ARRAY_LEN(cli_http));

   return __ast_http_load(0) ? AST_MODULE_LOAD_FAILURE : AST_MODULE_LOAD_SUCCESS;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Built-in HTTP Server",
   .support_level = AST_MODULE_SUPPORT_CORE,
   .load = load_module,
   .unload = unload_module,
   .reload = reload_module,
   .load_pri = AST_MODPRI_CORE,
   .requires = "extconfig",
);