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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
// Parser control
#ifndef _PARSE_CTRL_H
#define _PARSE_CTRL_H
#include "sip_message.h"
#include "threads/mutex.h"
#define MSG t_parser::msg
#define CTXT_INITIAL (t_parser::context = t_parser::X_INITIAL)
#define CTXT_URI (t_parser::context = t_parser::X_URI)
#define CTXT_URI_SPECIAL (t_parser::context = t_parser::X_URI_SPECIAL)
#define CTXT_LANG (t_parser::context = t_parser::X_LANG)
#define CTXT_WORD (t_parser::context = t_parser::X_WORD)
#define CTXT_NUM (t_parser::context = t_parser::X_NUM)
#define CTXT_DATE (t_parser::context = t_parser::X_DATE)
#define CTXT_LINE (t_parser::context = t_parser::X_LINE)
#define CTXT_COMMENT (t_parser::enter_ctx_comment())
#define CTXT_NEW (t_parser::context = t_parser::X_NEW)
#define CTXT_AUTH_SCHEME (t_parser::context = t_parser::X_AUTH_SCHEME)
#define CTXT_IPV6ADDR (t_parser::context = t_parser::X_IPV6ADDR)
#define CTXT_PARAMVAL (t_parser::context = t_parser::X_PARAMVAL)
#define PARSE_ERROR(h) { t_parser::add_header_error(h); CTXT_INITIAL; }
// The t_parser controls the direction of the scanner/parser
// process and it stores the results from the parser.
class t_parser {
private:
/** Mutex to synchronize parse operations */
static t_mutex mtx_parser;
// Level for nested comments
static int comment_level;
// Non-fatal parse errors generated during parsing.
static list<string> parse_errors;
// Unfold SIP headers
static string unfold(const string &h);
public:
enum t_context {
X_INITIAL, // Initial context
X_URI, // URI context where parameters belong to URI
X_URI_SPECIAL, // URI context where parameters belong to SIP header
// if URI is not enclosed by < and >
X_LANG, // Language tag context
X_WORD, // Word context
X_NUM, // Number context
X_DATE, // Date context
X_LINE, // Whole line context
X_COMMENT, // Comment context
X_NEW, // Start of a new SIP message to distinguish
// request from responses
X_AUTH_SCHEME, // Authorization scheme context
X_IPV6ADDR, // IPv6 address context
X_PARAMVAL, // Generic parameter value context
};
// Parser options
// According to RFC3261 the Max-Forwards header is mandatory, but
// many implementations do not send this header.
static bool check_max_forwards;
// Encode headers in compact forom
static bool compact_headers;
// Encode multiple values as comma separated list or multiple headers
static bool multi_values_as_list;
static t_context context; // Scan context
static t_sip_message *msg; // Message that has been parsed
/**
* Parse a string representing a SIP message.
* @param s [in] String to parse.
* @param parse_errors_ [out] List of non-fatal parse errors.
* @return The parsed SIP message.
* @throw int exception when parsing fails.
*/
static t_sip_message *parse(const string &s, list<string> &parse_errors_);
/**
* Parse a string of headers (hdr1=val1;hdr=val2;...)
* The resulting SIP message is a SIP request with a fake request line.
* @param s [in] String to parse.
* @param parse_errors_ [out] List of non-fatal parse errors.
* @return The parsed SIP message.
* @throw int exception when parsing fails.
*/
static t_sip_message *parse_headers(const string &s, list<string> &parse_errors_);
static void enter_ctx_comment(void);
// Increment and decrement levels for nested comments
// dec_comment_level returns false if the level cannot be decremented.
static void inc_comment_level(void);
static bool dec_comment_level(void);
// Add parsing error for a header to the list of parse errors
static void add_header_error(const string &header_name);
};
// Error that can be thrown as exception
class t_syntax_error {
public:
string error;
t_syntax_error(const string &e);
};
#endif
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