acc_mod.c

用来作为linux中SIP SERVER,完成VOIP网络电话中服务器的功能

	if (service_type != -1)
		vals[V_SIP_SESSION].v = service_type;
#endif

	return 0;
}

static int child_init(int rank)
{
#ifdef SQL_ACC
	if (acc_db_init()<0)
		return -1;
#endif

/* DIAMETER */
#ifdef DIAM_ACC
	/* open TCP connection */
	DBG(M_NAME": Initializing TCP connection\n");

	sockfd = init_mytcp(diameter_client_host, diameter_client_port);
	if(sockfd==-1) 
	{
		DBG(M_NAME": TCP connection not established\n");
		return -1;
	}

	DBG(M_NAME": TCP connection established on sockfd=%d\n", sockfd);

	/* every child with its buffer */
	rb = (rd_buf_t*)pkg_malloc(sizeof(rd_buf_t));
	if(!rb)
	{
		DBG("acc: mod_child_init: no more free memory\n");
		return -1;
	}
	rb->buf = 0;

#endif

	return 0;
}

static void destroy(void)
{
#ifdef SQL_ACC
	acc_db_close();
#endif
#ifdef DIAM_ACC
	close_tcp_connection(sockfd);
#endif
}


static inline void acc_preparse_req(struct sip_msg *rq)
{
	/* try to parse from for From-tag for accounted transactions; 
	 * don't be worried about parsing outcome -- if it failed, 
	 * we will report N/A
	 */
	parse_headers(rq, HDR_CALLID| HDR_FROM| HDR_TO, 0 );
	parse_from_header(rq);

	if (strchr(log_fmt, 'p') || strchr(log_fmt, 'D')) {
		parse_orig_ruri(rq);
	}
}


/* prepare message and transaction context for later accounting */
static void acc_onreq( struct cell* t, int type, struct tmcb_params *ps )
{
	int tmcb_types;

	if (is_acc_on(ps->req) || is_mc_on(ps->req)) {
		/* install addaitional handlers */
		tmcb_types =
			/* report on completed transactions */
			TMCB_RESPONSE_OUT |
			/* account e2e acks if configured to do so */
			TMCB_E2EACK_IN |
			/* report on missed calls */
			TMCB_ON_FAILURE_RO |
			/* get incoming replies ready for processing */
			TMCB_RESPONSE_IN;
		if (tmb.register_tmcb( 0, t, tmcb_types, tmcb_func, 0 )<=0) {
			LOG(L_ERR,"ERROR:acc:acc_onreq: cannot register additional "
				"callbacks\n");
			return;
		}
		/* do some parsing in advance */
		acc_preparse_req(ps->req);
		/* also, if that is INVITE, disallow silent t-drop */
		if (ps->req->REQ_METHOD==METHOD_INVITE) {
			DBG("DEBUG: noisy_timer set for accounting\n");
			t->flags |= T_NOISY_CTIMER_FLAG;
		}
	}
}

/* is this reply of interest for accounting ? */
static inline int should_acc_reply(struct cell *t, int code)
{
	struct sip_msg *r;

	r=t->uas.request;

	/* validation */
	if (r==0) {
		LOG(L_ERR, "ERROR: acc: should_acc_reply: 0 request\n");
		return 0;
	}

	/* negative transactions reported otherwise only if explicitly 
	 * demanded */
	if (!failed_transactions && code >=300) return 0;
	if (!is_acc_on(r))
		return 0;
	if (skip_cancel(r))
		return 0;
	if (code < 200 && ! (early_media && code==183))
		return 0;

	return 1; /* seed is through, we will account this reply */
}

/* parse incoming replies before cloning */
static inline void acc_onreply_in(struct cell *t, struct sip_msg *reply,
	int code, void *param)
{
	/* validation */
	if (t->uas.request==0) {
		LOG(L_ERR, "ERROR: acc: should_acc_reply: 0 request\n");
		return;
	}

	/* don't parse replies in which we are not interested */
	/* missed calls enabled ? */
	if (((is_invite(t) && code>=300 && is_mc_on(t->uas.request))
					|| should_acc_reply(t,code)) 
				&& (reply && reply!=FAKED_REPLY)) {
		parse_headers(reply, HDR_TO, 0 );
	}
}

/* initiate a report if we previously enabled MC accounting for this t */
static inline void on_missed(struct cell *t, struct sip_msg *reply,
	int code, void *param )
{
	int reset_lmf; 
#ifdef SQL_ACC
	int reset_dmf;
#endif
#ifdef RAD_ACC
	int reset_rmf;
#endif
/* DIAMETER */
#ifdef DIAM_ACC
	int reset_dimf;
#endif

	/* validation */
	if (t->uas.request==0) {
		DBG("DBG: acc: on_missed: no uas.request, local t; skipping\n");
		return;
	}

	if (is_invite(t) && code>=300) {
		if (is_log_mc_on(t->uas.request)) {
			acc_log_missed( t, reply, code);
			reset_lmf=1;
		} else reset_lmf=0;
#ifdef SQL_ACC
		if (is_db_mc_on(t->uas.request)) {
			acc_db_missed( t, reply, code);
			reset_dmf=1;
		} else reset_dmf=0;
#endif
#ifdef RAD_ACC
		if (is_rad_mc_on(t->uas.request)) {
			acc_rad_missed(t, reply, code );
			reset_rmf=1;
		} else reset_rmf=0;
#endif
/* DIAMETER */
#ifdef DIAM_ACC
		if (is_diam_mc_on(t->uas.request)) {
			acc_diam_missed(t, reply, code );
			reset_dimf=1;
		} else reset_dimf=0;
#endif
		/* we report on missed calls when the first
		 * forwarding attempt fails; we do not wish to
		 * report on every attempt; so we clear the flags; 
		 * we do it after all reporting is over to be sure
		 * that all reporting functions got a fair chance
		 */
		if (reset_lmf) resetflag(t->uas.request, log_missed_flag);
#ifdef SQL_ACC
		if (reset_dmf) resetflag(t->uas.request, db_missed_flag);
#endif
#ifdef RAD_ACC
		if (reset_rmf) resetflag(t->uas.request, radius_missed_flag);
#endif
/* DIAMETER */	
#ifdef DIAM_ACC
		if (reset_dimf) resetflag(t->uas.request, diameter_missed_flag);
#endif
	}
}


/* initiate a report if we previously enabled accounting for this t */
static inline void acc_onreply( struct cell* t, struct sip_msg *reply,
	int code, void *param )
{
	/* validation */
	if (t->uas.request==0) {
		DBG("DBG: acc: onreply: no uas.request, local t; skipping\n");
		return;
	}

	/* acc_onreply is bound to TMCB_REPLY which may be called
	   from _reply, like when FR hits; we should not miss this
	   event for missed calls either
	*/
	on_missed(t, reply, code, param );

	if (!should_acc_reply(t, code)) return;
	if (is_log_acc_on(t->uas.request))
		acc_log_reply(t, reply, code);
#ifdef SQL_ACC
	if (is_db_acc_on(t->uas.request))
		acc_db_reply(t, reply, code);
#endif
#ifdef RAD_ACC
	if (is_rad_acc_on(t->uas.request))
		acc_rad_reply(t, reply, code);
#endif
/* DIAMETER */
#ifdef DIAM_ACC
	if (is_diam_acc_on(t->uas.request))
		acc_diam_reply(t, reply, code);
#endif
}




static inline void acc_onack( struct cell* t , struct sip_msg *ack,
	int code, void *param )
{
	/* only for those guys who insist on seeing ACKs as well */
	if (!report_ack) return;
	/* if acc enabled for flagged transaction, check if flag matches */
	if (is_log_acc_on(t->uas.request)) {
		acc_preparse_req(ack);
		acc_log_ack(t, ack);
	}
#ifdef SQL_ACC
	if (is_db_acc_on(t->uas.request)) {
		acc_preparse_req(ack);
		acc_db_ack(t, ack);
	}
#endif
#ifdef RAD_ACC
	if (is_rad_acc_on(t->uas.request)) {
		acc_preparse_req(ack);
		acc_rad_ack(t,ack);
	}
#endif
/* DIAMETER */
#ifdef DIAM_ACC
	if (is_diam_acc_on(t->uas.request)) {
		acc_preparse_req(ack);
		acc_diam_ack(t,ack);
	}
#endif
	
}


static void tmcb_func( struct cell* t, int type, struct tmcb_params *ps )
{
	if (type&TMCB_RESPONSE_OUT) {
		acc_onreply( t, ps->rpl, ps->code, ps->param );
	} else if (type&TMCB_E2EACK_IN) {
		acc_onack( t, ps->req, ps->code, ps->param );
	} else if (type&TMCB_ON_FAILURE_RO) {
		on_missed( t, ps->rpl, ps->code, ps->param );
	} else if (type&TMCB_RESPONSE_IN) {
		acc_onreply_in( t, ps->rpl, ps->code, ps->param);
	}
}


/* these wrappers parse all what may be needed; they don't care about
 * the result -- accounting functions just display "unavailable" if there
 * is nothing meaningful
 */
static int w_acc_log_request(struct sip_msg *rq, char *comment, char *foo)
{
	str txt; str phrase;

	txt.s=ACC_REQUEST;
	txt.len=ACC_REQUEST_LEN;
	phrase.s=comment;
	phrase.len=strlen(comment);	/* fix_param would be faster! */
	acc_preparse_req(rq);
	return acc_log_request(rq, rq->to, &txt, &phrase);
}


#ifdef SQL_ACC
static int w_acc_db_request(struct sip_msg *rq, char *comment, char *table)
{
	str phrase;

	phrase.s=comment;
	phrase.len=strlen(comment);	/* fix_param would be faster! */
	acc_preparse_req(rq);
	return acc_db_request(rq, rq->to,&phrase,table, SQL_MC_FMT );
}
#endif


#ifdef RAD_ACC
static int w_acc_rad_request(struct sip_msg *rq, char *comment, 
				char *foo)
{
	str phrase;

	phrase.s=comment;
	phrase.len=strlen(comment);	/* fix_param would be faster! */
	acc_preparse_req(rq);
	return acc_rad_request(rq, rq->to,&phrase);
}
#endif


/* DIAMETER */
#ifdef DIAM_ACC
static int w_acc_diam_request(struct sip_msg *rq, char *comment, 
				char *foo)
{
	str phrase;

	phrase.s=comment;
	phrase.len=strlen(comment);	/* fix_param would be faster! */
	acc_preparse_req(rq);
	return acc_diam_request(rq, rq->to,&phrase);
}
#endif