asterisk/main/http.c

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * 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 <markster@digium.com>
 *
 * This program implements a tiny http server
 * and was inspired by micro-httpd by Jef Poskanzer 
 * 
 * \ref AstHTTP - AMI over the http protocol
 */

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include "asterisk/paths.h"	/* use ast_config_AST_DATA_DIR */
#include "asterisk/network.h"
#include <time.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/signal.h>
#include <fcntl.h>

#ifdef ENABLE_UPLOADS
#include <gmime/gmime.h>
#endif /* ENABLE_UPLOADS */

#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"

#define MAX_PREFIX 80

/* See http.h for more information about the SSL implementation */
#if defined(HAVE_OPENSSL) && (defined(HAVE_FUNOPEN) || defined(HAVE_FOPENCOOKIE))
#define	DO_SSL	/* comment in/out if you want to support ssl */
#endif

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 server_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 server_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 */

#ifdef ENABLE_UPLOADS
struct ast_http_post_mapping {
	AST_RWLIST_ENTRY(ast_http_post_mapping) entry;
	char *from;
	char *to;
};

static AST_RWLIST_HEAD_STATIC(post_mappings, ast_http_post_mapping);

struct mime_cbinfo {
	int count;
	const char *post_dir;
};
#endif /* ENABLE_UPLOADS */

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

/*! \brief Limit the kinds of files we're willing to serve up */
static struct {
	const char *ext;
	const char *mtype;
} mimetypes[] = {
	{ "png", "image/png" },
	{ "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" },
};

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 char *ftype2mtype(const char *ftype, char *wkspace, int wkspacelen)
{
	int x;
	if (ftype) {
		for (x=0;x<sizeof(mimetypes) / sizeof(mimetypes[0]); x++) {
			if (!strcasecmp(ftype, mimetypes[x].ext))
				return mimetypes[x].mtype;
		}
	}
	snprintf(wkspace, wkspacelen, "text/%s", ftype ? ftype : "plain");
	return wkspace;
}

static uint32_t manid_from_vars(struct ast_variable *sid) {
	uint32_t mngid;

	while (sid && strcmp(sid->name, "mansession_id"))
		sid = sid->next;

	if (!sid || sscanf(sid->value, "%30x", &mngid) != 1)
		return 0;

	return mngid;
}

static struct ast_str *static_callback(struct ast_tcptls_session_instance *ser, const char *uri, struct ast_variable *vars, int *status, char **title, int *contentlength)
{
	char *path;
	char *ftype;
	const char *mtype;
	char wkspace[80];
	struct stat st;
	int len;
	int fd;
	struct timeval tv = ast_tvnow();
	char buf[256];
	struct ast_tm tm;

	/* 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. */
	if (!enablestatic || ast_strlen_zero(uri))
		goto out403;
	/* Disallow any funny filenames at all */
	if ((uri[0] < 33) || strchr("./|~@#$%^&*() \t", uri[0]))
		goto out403;
	if (strstr(uri, "/.."))
		goto out403;
		
	if ((ftype = strrchr(uri, '.')))
		ftype++;
	mtype = ftype2mtype(ftype, wkspace, sizeof(wkspace));
	
	/* Cap maximum length */
	len = strlen(uri) + strlen(ast_config_AST_DATA_DIR) + strlen("/static-http/") + 5;
	if (len > 1024)
		goto out403;
		
	path = 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;
	fd = open(path, O_RDONLY);
	if (fd < 0)
		goto out403;

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

	ast_strftime(buf, sizeof(buf), "%a, %d %b %Y %H:%M:%S %Z", ast_localtime(&tv, &tm, "GMT"));
	fprintf(ser->f, "HTTP/1.1 200 OK\r\n"
		"Server: Asterisk/%s\r\n"
		"Date: %s\r\n"
		"Connection: close\r\n"
		"Cache-Control: private\r\n"
		"Content-Length: %d\r\n"
		"Content-type: %s\r\n\r\n",
		ast_get_version(), buf, (int) st.st_size, mtype);

	while ((len = read(fd, buf, sizeof(buf))) > 0)
		if (fwrite(buf, 1, len, ser->f) != len) {
			ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
		}

	close(fd);
	return NULL;

out404:
	return ast_http_error((*status = 404),
			      (*title = ast_strdup("Not Found")),
			       NULL, "The requested URL was not found on this server.");

out403:
	return ast_http_error((*status = 403),
			      (*title = ast_strdup("Access Denied")),
			      NULL, "You do not have permission to access the requested URL.");
}


static struct ast_str *httpstatus_callback(struct ast_tcptls_session_instance *ser, const char *uri, struct ast_variable *vars, int *status, char **title, int *contentlength)
{
	struct ast_str *out = ast_str_create(512);
	struct ast_variable *v;

	if (out == NULL)
		return out;

	ast_str_append(&out, 0,
		"\r\n"
		"<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>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_inet_ntoa(http_desc.oldsin.sin_addr));
	ast_str_append(&out, 0, "<tr><td><i>Bind Port</i></td><td><b>%d</b></td></tr>\r\n",
			ntohs(http_desc.oldsin.sin_port));
	if (http_tls_cfg.enabled)
		ast_str_append(&out, 0, "<tr><td><i>SSL Bind Port</i></td><td><b>%d</b></td></tr>\r\n",
			ntohs(https_desc.oldsin.sin_port));
	ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
	for (v = vars; v; v = v->next) {
		if (strncasecmp(v->name, "cookie_", 7))
			ast_str_append(&out, 0, "<tr><td><i>Submitted 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");
	for (v = vars; v; v = v->next) {
		if (!strncasecmp(v->name, "cookie_", 7))
			ast_str_append(&out, 0, "<tr><td><i>Cookie '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
	}
	ast_str_append(&out, 0, "</table><center><font size=\"-1\"><i>Asterisk and Digium are registered trademarks of Digium, Inc.</i></font></center></body>\r\n");
	return out;
}

static struct ast_http_uri statusuri = {
	.callback = httpstatus_callback,
	.description = "Asterisk HTTP General Status",
	.uri = "httpstatus",
	.has_subtree = 0,
};
	
static struct ast_http_uri staticuri = {
	.callback = static_callback,
	.description = "Asterisk HTTP Static Delivery",
	.uri = "static",
	.has_subtree = 1,
	.static_content = 1,
};
	
struct ast_str *ast_http_error(int status, const char *title, const char *extra_header, const char *text)
{
	struct ast_str *out = ast_str_create(512);
	if (out == NULL)
		return out;
	ast_str_set(&out, 0,
		"Content-type: text/html\r\n"
		"%s"
		"\r\n"
		"<!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"
		"<address>Asterisk Server</address>\r\n"
		"</body></html>\r\n",
			(extra_header ? extra_header : ""), status, title, title, text);
	return out;
}

/*! \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);

	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);
}

#ifdef ENABLE_UPLOADS
/*! \note This assumes that the post_mappings list is locked */
static struct ast_http_post_mapping *find_post_mapping(const char *uri)
{
	struct ast_http_post_mapping *post_map;

	if (!ast_strlen_zero(prefix) && strncmp(prefix, uri, strlen(prefix))) {
		ast_debug(1, "URI %s does not have prefix %s\n", uri, prefix);
		return NULL;
	}

	uri += strlen(prefix);
	if (*uri == '/')
		uri++;
	
	AST_RWLIST_TRAVERSE(&post_mappings, post_map, entry) {
		if (!strcmp(uri, post_map->from))
			return post_map;
	}

	return NULL;
}

static void post_raw(GMimePart *part, const char *post_dir, const char *fn)
{
	char filename[PATH_MAX];
	GMimeDataWrapper *content;
	GMimeStream *stream;
	int fd;

	snprintf(filename, sizeof(filename), "%s/%s", post_dir, fn);

	ast_debug(1, "Posting raw data to %s\n", filename);

	if ((fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666)) == -1) {
		ast_log(LOG_WARNING, "Unable to open %s for writing file from a POST!\n", filename);
		return;
	}

	stream = g_mime_stream_fs_new(fd);

	content = g_mime_part_get_content_object(part);
	g_mime_data_wrapper_write_to_stream(content, stream);
	g_mime_stream_flush(stream);

	g_object_unref(content);
	g_object_unref(stream);
}

static GMimeMessage *parse_message(FILE *f)
{
	GMimeMessage *message;
	GMimeParser *parser;
	GMimeStream *stream;

	stream = g_mime_stream_file_new(f);

	parser = g_mime_parser_new_with_stream(stream);
	g_mime_parser_set_respect_content_length(parser, 1);
	
	g_object_unref(stream);

	message = g_mime_parser_construct_message(parser);

	g_object_unref(parser);

	return message;
}

static void process_message_callback(GMimeObject *part, gpointer user_data)
{
	struct mime_cbinfo *cbinfo = user_data;

	cbinfo->count++;

	/* We strip off the headers before we get here, so should only see GMIME_IS_PART */
	if (GMIME_IS_MESSAGE_PART(part)) {
		ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MESSAGE_PART\n");
		return;
	} else if (GMIME_IS_MESSAGE_PARTIAL(part)) {
		ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MESSAGE_PARTIAL\n");
		return;
	} else if (GMIME_IS_MULTIPART(part)) {
		GList *l;
		
		ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MULTIPART, trying to process subparts\n");
		l = GMIME_MULTIPART (part)->subparts;
		while (l) {
			process_message_callback(l->data, cbinfo);
			l = l->next;
		}
	} else if (GMIME_IS_PART(part)) {
		const char *filename;

		ast_debug(3, "Got mime part\n");
		if (ast_strlen_zero(filename = g_mime_part_get_filename(GMIME_PART(part)))) {
			ast_debug(1, "Skipping part with no filename\n");
			return;
		}

		post_raw(GMIME_PART(part), cbinfo->post_dir, filename);
	} else {
		ast_log(LOG_ERROR, "Encountered unknown MIME part. This should never happen!\n");
	}
}

static int process_message(GMimeMessage *message, const char *post_dir)
{
	struct mime_cbinfo cbinfo = {
		.count = 0,
		.post_dir = post_dir,
	};

	g_mime_message_foreach_part(message, process_message_callback, &cbinfo);

	return cbinfo.count;
}

static struct ast_str *handle_post(struct ast_tcptls_session_instance *ser, char *uri, 
	int *status, char **title, int *contentlength, struct ast_variable *headers,
	struct ast_variable *cookies)
{
	char buf[4096];
	FILE *f;
	size_t res;
	struct ast_variable *var;
	int content_len = 0;
	struct ast_http_post_mapping *post_map;
	const char *post_dir;
	unsigned long ident = 0;
	GMimeMessage *message;
	int message_count = 0;

	for (var = cookies; var; var = var->next) {
		if (strcasecmp(var->name, "mansession_id"))
			continue;

		if (sscanf(var->value, "%30lx", &ident) != 1) {
			*status = 400;
			*title = ast_strdup("Bad Request");
			return ast_http_error(400, "Bad Request", NULL, "The was an error parsing the request.");
		}

		if (!astman_verify_session_writepermissions(ident, EVENT_FLAG_CONFIG)) {
			*status = 401;
			*title = ast_strdup("Unauthorized");
			return ast_http_error(401, "Unauthorized", NULL, "You are not authorized to make this request.");
		}

		break;
	}
	if (!var) {
		*status = 401;
		*title = ast_strdup("Unauthorized");
		return ast_http_error(401, "Unauthorized", NULL, "You are not authorized to make this request.");
	}

	if (!(f = tmpfile()))
		return NULL;

	for (var = headers; var; var = var->next) {
		if (!strcasecmp(var->name, "Content-Length")) {
			if ((sscanf(var->value, "%30u", &content_len)) != 1) {
				ast_log(LOG_ERROR, "Invalid Content-Length in POST request!\n");
				fclose(f);
				return NULL;
			}
			ast_debug(1, "Got a Content-Length of %d\n", content_len);
		} else if (!strcasecmp(var->name, "Content-Type"))
			fprintf(f, "Content-Type: %s\r\n\r\n", var->value);
	}

	for(res = sizeof(buf);content_len;content_len -= res) {
		if (content_len < res)
			res = content_len;
		if (fread(buf, 1, res, ser->f) != res) {
			ast_log(LOG_WARNING, "fread() failed: %s\n", strerror(errno));
		}
		if (fwrite(buf, 1, res, f) != res) {
			ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
		}
	}

	if (fseek(f, SEEK_SET, 0)) {
		ast_debug(1, "Failed to seek temp file back to beginning.\n");
		fclose(f);
		return NULL;
	}

	AST_RWLIST_RDLOCK(&post_mappings);
	if (!(post_map = find_post_mapping(uri))) {
		ast_debug(1, "%s is not a valid URI for POST\n", uri);
		AST_RWLIST_UNLOCK(&post_mappings);
		*status = 404;
		*title = ast_strdup("Not Found");
		return ast_http_error(404, "Not Found", NULL, "The requested URL was not found on this server.");
	}
	post_dir = ast_strdupa(post_map->to);
	post_map = NULL;
	AST_RWLIST_UNLOCK(&post_mappings);

	ast_debug(1, "Going to post files to dir %s\n", post_dir);

	message = parse_message(f); /* Takes ownership and will close f */

	if (!message) {
		ast_log(LOG_ERROR, "Error parsing MIME data\n");
		*status = 400;
		*title = ast_strdup("Bad Request");
		return ast_http_error(400, "Bad Request", NULL, "The was an error parsing the request.");
	}

	if (!(message_count = process_message(message, post_dir))) {
		ast_log(LOG_ERROR, "Invalid MIME data, found no parts!\n");
		*status = 400;
		*title = ast_strdup("Bad Request");
		return ast_http_error(400, "Bad Request", NULL, "The was an error parsing the request.");
	}

	*status = 200;
	*title = ast_strdup("OK");
	return ast_http_error(200, "OK", NULL, "File successfully uploaded.");
}
#endif /* ENABLE_UPLOADS */

/*
 * Decode special characters in http uri.
 * We have ast_uri_decode to handle %XX sequences, but spaces
 * are encoded as a '+' so we need to replace them beforehand.
 */
static void http_decode(char *s)
{
	char *t;
	
	for (t = s; *t; t++) {
		if (*t == '+')
			*t = ' ';
	}

	ast_uri_decode(s);
}

static struct ast_str *handle_uri(struct ast_tcptls_session_instance *ser, char *uri, int *status, 
	char **title, int *contentlength, struct ast_variable **cookies, 
	unsigned int *static_content)
{
	char *c;
	struct ast_str *out = NULL;
	char *params = uri;
	struct ast_http_uri *urih=NULL;
	int l;
	struct ast_variable *vars=NULL, *v, *prev = NULL;
	struct http_uri_redirect *redirect;

	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)
				http_decode(val);
			else 
				val = "";
			http_decode(var);
			if ((v = ast_variable_new(var, val, ""))) {
				if (vars)
					prev->next = v;
				else
					vars = v;
				prev = v;
			}
		}
	}
	/*
	 * Append the cookies to the variables (the only reason to have them
	 * at the end is to avoid another pass of the cookies list to find
	 * the tail).
	 */
	if (prev)
		prev->next = *cookies;
	else
		vars = *cookies;
	*cookies = NULL;
	http_decode(uri);

	AST_RWLIST_RDLOCK(&uri_redirects);
	AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry) {
		if (!strcasecmp(uri, redirect->target)) {
			char buf[512];
			snprintf(buf, sizeof(buf), "Location: %s\r\n", redirect->dest);
			out = ast_http_error((*status = 302),
					     (*title = ast_strdup("Moved Temporarily")),
					     buf, "Redirecting...");

			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 */
			if (strncasecmp(urih->uri, uri, l) /* no match */
			    || (*c && *c != '/')) /* substring */
				continue;
			if (*c == '/')
				c++;
			if (!*c || urih->has_subtree) {
				uri = c;
				break;
			}
		}
		if (!urih)
			AST_RWLIST_UNLOCK(&uris);
	}
	if (urih) {
		if (urih->static_content)
			*static_content = 1;
		out = urih->callback(ser, uri, vars, status, title, contentlength);
		AST_RWLIST_UNLOCK(&uris);
	} else {
		out = ast_http_error(404, "Not Found", NULL,
			"The requested URL was not found on this server.");
		*status = 404;
		*title = ast_strdup("Not Found");
	}

cleanup:
	ast_variables_destroy(vars);
	return out;
}

#ifdef DO_SSL
#if defined(HAVE_FUNOPEN)
#define HOOK_T int
#define LEN_T int
#else
#define HOOK_T ssize_t
#define LEN_T size_t
#endif
/*!
 * replacement read/write functions for SSL support.
 * We use wrappers rather than SSL_read/SSL_write directly so
 * we can put in some debugging.
 */
/*static HOOK_T ssl_read(void *cookie, char *buf, LEN_T len)
{
	int i = SSL_read(cookie, buf, len-1);
#if 0
	if (i >= 0)
		buf[i] = '\0';
	ast_verbose("ssl read size %d returns %d <%s>\n", (int)len, i, buf);
#endif
	return i;
}

static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)
{
#if 0
	char *s = alloca(len+1);
	strncpy(s, buf, len);
	s[len] = '\0';
	ast_verbose("ssl write size %d <%s>\n", (int)len, s);
#endif
	return SSL_write(cookie, buf, len);
}

static int ssl_close(void *cookie)
{
	close(SSL_get_fd(cookie));
	SSL_shutdown(cookie);
	SSL_free(cookie);
	return 0;
}*/
#endif	/* DO_SSL */

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

	/* Skip Cookie: */
	cookies += 8;

	while ((cur = strsep(&cookies, ";"))) {
		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;
		}

		if (option_debug) {
			ast_log(LOG_DEBUG, "mmm ... cookie!  Name: '%s'  Value: '%s'\n", name, val);
		}

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

	return vars;
}

static void *httpd_helper_thread(void *data)
{
	char buf[4096];
	char cookie[4096];
	struct ast_tcptls_session_instance *ser = data;
	struct ast_variable *vars=NULL, *headers = NULL;
	char *uri, *title=NULL;
	int status = 200, contentlength = 0;
	struct ast_str *out = NULL;
	unsigned int static_content = 0;

	if (!fgets(buf, sizeof(buf), ser->f))
		goto done;

	uri = ast_skip_nonblanks(buf);	/* Skip method */
	if (*uri)
		*uri++ = '\0';

	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';
	}

	/* process "Cookie: " lines */
	while (fgets(cookie, sizeof(cookie), ser->f)) {
		/* Trim trailing characters */
		ast_trim_blanks(cookie);
		if (ast_strlen_zero(cookie))
			break;
		if (strncasecmp(cookie, "Cookie: ", 8)) {
			char *name, *value;
			struct ast_variable *var;

			value = ast_strdupa(cookie);
			name = strsep(&value, ":");
			if (!value)
				continue;
			value = ast_skip_blanks(value);
			if (ast_strlen_zero(value))
				continue;
			var = ast_variable_new(name, value, "");
			if (!var)
				continue;
			var->next = headers;
			headers = var;
			continue;
		}

		if (vars) {
			ast_variables_destroy(vars);
		}
		vars = parse_cookies(cookie);
	}

	if (!*uri) {
		out = ast_http_error(400, "Bad Request", NULL, "Invalid Request");
	} else if (!strcasecmp(buf, "post")) {
#ifdef ENABLE_UPLOADS
		out = handle_post(ser, uri, &status, &title, &contentlength, headers, vars);
#else
		out = ast_http_error(501, "Not Implemented", NULL,
			"Attempt to use unimplemented / unsupported method");
#endif /* ENABLE_UPLOADS */
	} else if (strcasecmp(buf, "get")) {
		out = ast_http_error(501, "Not Implemented", NULL,
			"Attempt to use unimplemented / unsupported method");
	} else {	/* try to serve it */
		out = handle_uri(ser, uri, &status, &title, &contentlength, &vars, &static_content);
	}

	/* If they aren't mopped up already, clean up the cookies */
	if (vars)
		ast_variables_destroy(vars);
	/* Clean up all the header information pulled as well */
	if (headers)
		ast_variables_destroy(headers);

	if (out) {
		struct timeval tv = ast_tvnow();
		char timebuf[256];
		struct ast_tm tm;

		ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S %Z", ast_localtime(&tv, &tm, "GMT"));
		fprintf(ser->f, "HTTP/1.1 %d %s\r\n"
				"Server: Asterisk/%s\r\n"
				"Date: %s\r\n"
				"Connection: close\r\n"
				"%s",
			status, title ? title : "OK", ast_get_version(), timebuf,
			static_content ? "" : "Cache-Control: no-cache, no-store\r\n");
			/* We set the no-cache headers only for dynamic content.
			* If you want to make sure the static file you requested is not from cache,
			* append a random variable to your GET request.  Ex: 'something.html?r=109987734'
			*/
		if (!contentlength) {	/* opaque body ? just dump it hoping it is properly formatted */
			fprintf(ser->f, "%s", out->str);
		} else {
			char *tmp = strstr(out->str, "\r\n\r\n");

			if (tmp) {
				fprintf(ser->f, "Content-length: %d\r\n", contentlength);
				/* first write the header, then the body */
				if (fwrite(out->str, 1, (tmp + 4 - out->str), ser->f) != tmp + 4 - out->str) {
					ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
				}
				if (fwrite(tmp + 4, 1, contentlength, ser->f) != contentlength ) {
					ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
				}
			}
		}
		ast_free(out);
	}
	if (title)
		ast_free(title);

done:
	fclose(ser->f);
	ao2_ref(ser, -1);
	ser = NULL;
	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;

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

	if (!(redirect = ast_calloc(1, total_len)))
		return;

	redirect->dest = redirect->target + target_len;
	strcpy(redirect->target, target);
	strcpy(redirect->dest, dest);

	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);
}

#ifdef ENABLE_UPLOADS
static void destroy_post_mapping(struct ast_http_post_mapping *post_map)
{
	if (post_map->from)
		ast_free(post_map->from);
	if (post_map->to)
		ast_free(post_map->to);
	ast_free(post_map);
}

static void destroy_post_mappings(void)
{
	struct ast_http_post_mapping *post_map;

	AST_RWLIST_WRLOCK(&post_mappings);
	while ((post_map = AST_RWLIST_REMOVE_HEAD(&post_mappings, entry)))
		destroy_post_mapping(post_map);
	AST_RWLIST_UNLOCK(&post_mappings);
}

static void add_post_mapping(const char *from, const char *to)
{
	struct ast_http_post_mapping *post_map;

	if (!(post_map = ast_calloc(1, sizeof(*post_map))))
		return;

	if (!(post_map->from = ast_strdup(from))) {
		destroy_post_mapping(post_map);
		return;
	}

	if (!(post_map->to = ast_strdup(to))) {
		destroy_post_mapping(post_map);
		return;
	}

	AST_RWLIST_WRLOCK(&post_mappings);
	AST_RWLIST_INSERT_TAIL(&post_mappings, post_map, entry);
	AST_RWLIST_UNLOCK(&post_mappings);
}
#endif /* ENABLE_UPLOADS */

static int __ast_http_load(int reload)
{
	struct ast_config *cfg;
	struct ast_variable *v;
	int enabled=0;
	int newenablestatic=0;
	struct hostent *hp;
	struct ast_hostent ahp;
	char newprefix[MAX_PREFIX] = "";
	int have_sslbindaddr = 0;
	struct http_uri_redirect *redirect;
	struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };

	if ((cfg = ast_config_load("http.conf", config_flags)) == CONFIG_STATUS_FILEUNCHANGED)
		return 0;

	/* default values */
	memset(&http_desc.sin, 0, sizeof(http_desc.sin));
	http_desc.sin.sin_port = htons(8088);

	memset(&https_desc.sin, 0, sizeof(https_desc.sin));
	https_desc.sin.sin_port = htons(8089);

	http_tls_cfg.enabled = 0;
	if (http_tls_cfg.certfile)
		ast_free(http_tls_cfg.certfile);
	http_tls_cfg.certfile = ast_strdup(AST_CERTFILE);
	if (http_tls_cfg.cipher)
		ast_free(http_tls_cfg.cipher);
	http_tls_cfg.cipher = ast_strdup("");

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

#ifdef ENABLE_UPLOADS
	destroy_post_mappings();
#endif /* ENABLE_UPLOADS */

	if (cfg) {
		v = ast_variable_browse(cfg, "general");
		for (; v; v = v->next) {
			if (!strcasecmp(v->name, "enabled"))
				enabled = ast_true(v->value);
			else if (!strcasecmp(v->name, "sslenable"))
				http_tls_cfg.enabled = ast_true(v->value);
			else if (!strcasecmp(v->name, "sslbindport"))
				https_desc.sin.sin_port = htons(atoi(v->value));
			else if (!strcasecmp(v->name, "sslcert")) {
				ast_free(http_tls_cfg.certfile);
				http_tls_cfg.certfile = ast_strdup(v->value);
			} else if (!strcasecmp(v->name, "sslcipher")) {
				ast_free(http_tls_cfg.cipher);
				http_tls_cfg.cipher = ast_strdup(v->value);
			}
			else if (!strcasecmp(v->name, "enablestatic"))
				newenablestatic = ast_true(v->value);
			else if (!strcasecmp(v->name, "bindport"))
				http_desc.sin.sin_port = htons(atoi(v->value));
			else if (!strcasecmp(v->name, "sslbindaddr")) {
				if ((hp = ast_gethostbyname(v->value, &ahp))) {
					memcpy(&https_desc.sin.sin_addr, hp->h_addr, sizeof(https_desc.sin.sin_addr));
					have_sslbindaddr = 1;
				} else {
					ast_log(LOG_WARNING, "Invalid bind address '%s'\n", v->value);
				}
			} else if (!strcasecmp(v->name, "bindaddr")) {
				if ((hp = ast_gethostbyname(v->value, &ahp))) {
					memcpy(&http_desc.sin.sin_addr, hp->h_addr, sizeof(http_desc.sin.sin_addr));
				} else {
					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 {
				ast_log(LOG_WARNING, "Ignoring unknown option '%s' in http.conf\n", v->name);
			}
		}

#ifdef ENABLE_UPLOADS
		for (v = ast_variable_browse(cfg, "post_mappings"); v; v = v->next)
			add_post_mapping(v->name, v->value);
#endif /* ENABLE_UPLOADS */

		ast_config_destroy(cfg);
	}
	if (!have_sslbindaddr)
		https_desc.sin.sin_addr = http_desc.sin.sin_addr;
	if (enabled)
		http_desc.sin.sin_family = https_desc.sin.sin_family = AF_INET;
	if (strcmp(prefix, newprefix))
		ast_copy_string(prefix, newprefix, sizeof(prefix));
	enablestatic = newenablestatic;
	ast_tcptls_server_start(&http_desc);
	if (ast_ssl_setup(https_desc.tls_cfg))
		ast_tcptls_server_start(&https_desc);

	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;

#ifdef ENABLE_UPLOADS
	struct ast_http_post_mapping *post_map;
#endif /* ENABLE_UPLOADS */

	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);
	if (!http_desc.oldsin.sin_family)
		ast_cli(a->fd, "Server Disabled\n\n");
	else {
		ast_cli(a->fd, "Server Enabled and Bound to %s:%d\n\n",
			ast_inet_ntoa(http_desc.oldsin.sin_addr),
			ntohs(http_desc.oldsin.sin_port));
		if (http_tls_cfg.enabled)
			ast_cli(a->fd, "HTTPS Server Enabled and Bound to %s:%d\n\n",
				ast_inet_ntoa(https_desc.oldsin.sin_addr),
				ntohs(https_desc.oldsin.sin_port));
	}

	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);


#ifdef ENABLE_UPLOADS
	ast_cli(a->fd, "\nPOST mappings:\n");
	AST_RWLIST_RDLOCK(&post_mappings);
	AST_LIST_TRAVERSE(&post_mappings, post_map, entry) {
		ast_cli(a->fd, "%s/%s => %s\n", prefix, post_map->from, post_map->to);
	}
	ast_cli(a->fd, "%s\n", AST_LIST_EMPTY(&post_mappings) ? "None.\n" : "");
	AST_RWLIST_UNLOCK(&post_mappings);
#endif /* ENABLE_UPLOADS */

	return CLI_SUCCESS;
}

int ast_http_reload(void)
{
	return __ast_http_load(1);
}

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

int ast_http_init(void)
{
#ifdef ENABLE_UPLOADS
	g_mime_init(0);
#endif /* ENABLE_UPLOADS */

	ast_http_uri_link(&statusuri);
	ast_http_uri_link(&staticuri);
	ast_cli_register_multiple(cli_http, sizeof(cli_http) / sizeof(struct ast_cli_entry));

	return __ast_http_load(0);
}