parser.h

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Implementation of Inter-Asterisk eXchange
 *
 * Copyright (C) 2003, Digium
 *
 * Mark Spencer <markster@digium.com>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */
 
/*!\file
 * \brief Implementation of the IAX2 protocol
 */
 
#ifndef _IAX2_PARSER_H
#define _IAX2_PARSER_H
 
#include "asterisk/frame.h"
#include "asterisk/linkedlists.h"
#include "asterisk/crypto.h"
#include "asterisk/netsock2.h"
#include "iax2.h"
 
struct iax_ies {
    char *called_number;
    char *calling_number;
    char *calling_ani;
    char *calling_name;
    int calling_ton;
    int calling_tns;
    int calling_pres;
    int calling_ani2;
    char *called_context;
    char *username;
    char *password;
    iax2_format capability;
    iax2_format format;
    char *codec_prefs;
    char *language;
    int version;
    unsigned short adsicpe;
    char *dnid;
    char *rdnis;
    unsigned int authmethods;
    unsigned int encmethods;
    char *challenge;
    char *md5_result;
    char *rsa_result;
    struct ast_sockaddr apparent_addr;
    unsigned short refresh;
    unsigned short dpstatus;
    unsigned short callno;
    char *cause;
    unsigned char causecode;
    unsigned char iax_unknown;
    int msgcount;
    int autoanswer;
    int musiconhold;
    unsigned int transferid;
    unsigned int datetime;
    char *devicetype;
    char *serviceident;
    int firmwarever;
    unsigned int fwdesc;
    unsigned char *fwdata;
    unsigned char fwdatalen;
    unsigned char *enckey;
    unsigned char enckeylen;
    unsigned int provver;
    unsigned short samprate;
    int provverpres;
    unsigned int rr_jitter;
    unsigned int rr_loss;
    unsigned int rr_pkts;
    unsigned short rr_delay;
    unsigned int rr_dropped;
    unsigned int rr_ooo;
    struct ast_variable *vars;
    char *osptokenblock[IAX_MAX_OSPBLOCK_NUM];
    unsigned int ospblocklength[IAX_MAX_OSPBLOCK_NUM];
    unsigned char calltoken;
    unsigned char *calltokendata;
};
 
#define DIRECTION_INGRESS 1
#define DIRECTION_OUTGRESS 2
 
struct iax_frame {
#ifdef LIBIAX
    struct iax_session *session;
    struct iax_event *event;
#else
    int sockfd;
#endif
 
    /*! /Our/ call number */
    unsigned short callno;
    /*! /Their/ call number */
    unsigned short dcallno;
    /*! Start of raw frame (outgoing only) */
    void *data;
    /*! Length of frame (outgoing only) */
    int datalen;
    /*! How many retries so far? */
    int retries;
    /*! Outgoing relative timestamp (ms) */
    unsigned int ts;
    /*! How long to wait before retrying */
    int retrytime;
    /*! Are we received out of order?  */
    unsigned int outoforder:1;
    /*! Have we been sent at all yet? */
    unsigned int sentyet:1;
    /*! Non-zero if should be sent to transfer peer */
    unsigned int transfer:1;
    /*! Non-zero if this is the final message */
    unsigned int final:1;
    /*! Ingress or outgres */
    unsigned int direction:2;
    /*! Can this frame be cached? */
    unsigned int cacheable:1;
    /*! Outgoing Packet sequence number */
    int oseqno;
    /*! Next expected incoming packet sequence number */
    int iseqno;
    /*! Retransmission ID */
    int retrans;
    /*! is this packet encrypted or not. if set this varible holds encryption methods*/
    int encmethods;
    /*! store encrypt key */
    ast_aes_encrypt_key ecx;
    /*! store decrypt key which corresponds to ecx */
    ast_aes_decrypt_key mydcx;
    /*! random data for encryption pad */
    unsigned char semirand[32];
    /*! Easy linking */
    AST_LIST_ENTRY(iax_frame) list;
    /*! Actual, isolated frame header */
    struct ast_frame af;
    /*! Amount of space _allocated_ for data */
    size_t afdatalen;
    unsigned char unused[AST_FRIENDLY_OFFSET];
    unsigned char afdata[0];    /* Data for frame */
};
 
struct iax_ie_data {
    unsigned char buf[1024];
    int pos;
};
 
/* Choose a different function for output */
void iax_set_output(void (*output)(const char *data));
/* Choose a different function for errors */
void iax_set_error(void (*output)(const char *data));
void iax_showframe(struct iax_frame *f, struct ast_iax2_full_hdr *fhi, int rx, struct ast_sockaddr *addr, int datalen);
void iax_frame_subclass2str(enum iax_frame_subclass subclass, char *str, size_t len);
 
const char *iax_ie2str(int ie);
 
int iax_ie_append_raw(struct iax_ie_data *ied, unsigned char ie, const void *data, int datalen);
int iax_ie_append_addr(struct iax_ie_data *ied, unsigned char ie, const struct ast_sockaddr *addr);
int iax_ie_append_versioned_uint64(struct iax_ie_data *ied, unsigned char ie, unsigned char version, uint64_t value);
int iax_ie_append_int(struct iax_ie_data *ied, unsigned char ie, unsigned int value);
int iax_ie_append_short(struct iax_ie_data *ied, unsigned char ie, unsigned short value);
int iax_ie_append_str(struct iax_ie_data *ied, unsigned char ie, const char *str);
int iax_ie_append_byte(struct iax_ie_data *ied, unsigned char ie, unsigned char dat);
int iax_ie_append(struct iax_ie_data *ied, unsigned char ie);
int iax_parse_ies(struct iax_ies *ies, unsigned char *data, int datalen);
 
int iax_get_frames(void);
int iax_get_iframes(void);
int iax_get_oframes(void);
 
void iax_frame_wrap(struct iax_frame *fr, struct ast_frame *f);
struct iax_frame *iax_frame_new(int direction, int datalen, unsigned int cacheable);
void iax_frame_free(struct iax_frame *fr);
#endif