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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 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" },
{ "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. */
if (!enablestatic || 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> Asterisk™ 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 statusuri = {
.callback = httpstatus_callback,
.description = "Asterisk HTTP General Status",
.uri = "httpstatus",
.has_subtree = 0,
.data = NULL,
.key = __FILE__,
};
static struct ast_http_uri staticuri = {
.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') {