ie.c

Asterisk中信道部分的源码 。。。。

		return;
	if (p[0] < 1)
	{
		printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
		return;
	}

	*type = (p[1]&0x70) >> 4;
	*plan = p[1] & 0xf;
	if (!(p[1] & 0x80))
	{
		if (p[0] < 2)
		{
			printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
			return;
		}
		*present = (p[2]&0x60) >> 5;
		*screen = p[2] & 0x3;
		strnncpy(number, (char *)p+3, p[0]-2, number_len);
	} else
	{
		strnncpy(number, (char *)p+2, p[0]-1, number_len);
 		/* SPECIAL workarround for IBT software bug */ 
		/* if (number[0]==0x80) */
		/*  strcpy((char *)number, (char *)number+1); */
	}

	if (MISDN_IE_DEBG) printf("    type=%d plan=%d present=%d screen=%d number='%s'\n", *type, *plan, *present, *screen, number);
}


/* IE_CONNECTED_PN */
static void enc_ie_connected_pn(unsigned char **ntmode, msg_t *msg, int type, int plan, int present, int screen, char *number, int nt, struct misdn_bchannel *bc)
{
	unsigned char *p;
	Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
	int l;

	if (type<0 || type>7)
	{
		printf("%s: ERROR: type(%d) is out of range.\n", __FUNCTION__, type);
		return;
	}
	if (plan<0 || plan>15)
	{
		printf("%s: ERROR: plan(%d) is out of range.\n", __FUNCTION__, plan);
		return;
	}
	if (present>3)
	{
		printf("%s: ERROR: present(%d) is out of range.\n", __FUNCTION__, present);
		return;
	}
	if (present >= 0) if (screen<0 || screen>3)
	{
		printf("%s: ERROR: screen(%d) is out of range.\n", __FUNCTION__, screen);
		return;
	}

	if (MISDN_IE_DEBG) printf("    type=%d plan=%d present=%d screen=%d number='%s'\n", type, plan, present, screen, number);

	l = 1;
	if (number) if (number[0])
		l += strlen((char *)number);
	if (present >= 0)
		l += 1;
	p = msg_put(msg, l+2);
	if (nt)
		*ntmode = p+1;
	else
		qi->QI_ELEMENT(connected_nr) = p - (unsigned char *)qi - sizeof(Q931_info_t);
	p[0] = IE_CONNECT_PN;
	p[1] = l;
	if (present >= 0)
	{
		p[2] = 0x00 + (type<<4) + plan;
		p[3] = 0x80 + (present<<5) + screen;
		if (number) if (number[0])
			strncpy((char *)p+4, (char *)number, strlen((char *)number));
	} else
	{
		p[2] = 0x80 + (type<<4) + plan;
		if (number) if (number[0])
			strncpy((char *)p+3, (char *)number, strlen((char *)number));
	}
}

static void dec_ie_connected_pn(unsigned char *p, Q931_info_t *qi, int *type, int *plan, int *present, int *screen, char *number, int number_len, int nt, struct misdn_bchannel *bc)
{
	*type = -1;
	*plan = -1;
	*present = -1;
	*screen = -1;
	*number = '\0';

	if (!nt)
	{
		p = NULL;
		if (qi->QI_ELEMENT(connected_nr))
			p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(connected_nr) + 1;
	}
	if (!p)
		return;
	if (p[0] < 1)
	{
		printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
		return;
	}

	*type = (p[1]&0x70) >> 4;
	*plan = p[1] & 0xf;
	if (!(p[1] & 0x80))
	{
		if (p[0] < 2)
		{
			printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
			return;
		}
		*present = (p[2]&0x60) >> 5;
		*screen = p[2] & 0x3;
		strnncpy(number, (char *)p+3, p[0]-2, number_len);
	} else
	{
		strnncpy(number, (char *)p+2, p[0]-1, number_len);
	}

	if (MISDN_IE_DEBG) printf("    type=%d plan=%d present=%d screen=%d number='%s'\n", *type, *plan, *present, *screen, number);
}


/* IE_CAUSE */
static void enc_ie_cause(unsigned char **ntmode, msg_t *msg, int location, int cause, int nt, struct misdn_bchannel *bc)
{
	unsigned char *p;
	Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
	int l;

	if (location<0 || location>7)
	{
		printf("%s: ERROR: location(%d) is out of range.\n", __FUNCTION__, location);
		return;
	}
	if (cause<0 || cause>127)
	{
		printf("%s: ERROR: cause(%d) is out of range.\n", __FUNCTION__, cause);
		return;
	}

	if (MISDN_IE_DEBG) printf("    location=%d cause=%d\n", location, cause);

	l = 2;
	p = msg_put(msg, l+2);
	if (nt)
		*ntmode = p+1;
	else
		qi->QI_ELEMENT(cause) = p - (unsigned char *)qi - sizeof(Q931_info_t);
	p[0] = IE_CAUSE;
	p[1] = l;
	p[2] = 0x80 + location;
	p[3] = 0x80 + cause;
}

#if 0
static void enc_ie_cause_standalone(unsigned char **ntmode, msg_t *msg, int location, int cause, int nt, struct misdn_bchannel *bc)
{
	unsigned char *p = msg_put(msg, 4);
	Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
	if (ntmode)
		*ntmode = p+1;
	else
		qi->QI_ELEMENT(cause) = p - (unsigned char *)qi - sizeof(Q931_info_t);
	p[0] = IE_CAUSE;
	p[1] = 2;
	p[2] = 0x80 + location;
	p[3] = 0x80 + cause;
}
#endif

static void dec_ie_cause(unsigned char *p, Q931_info_t *qi, int *location, int *cause, int nt, struct misdn_bchannel *bc)
{
	*location = -1;
	*cause = -1;

	if (!nt)
	{
		p = NULL;
		if (qi->QI_ELEMENT(cause))
			p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(cause) + 1;
	}
	if (!p)
		return;
	if (p[0] < 2)
	{
		printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
		return;
	}

	*location = p[1] & 0x0f;
	*cause = p[2] & 0x7f;

	if (MISDN_IE_DEBG) printf("    location=%d cause=%d\n", *location, *cause);
}


/* IE_CHANNEL_ID */
static void enc_ie_channel_id(unsigned char **ntmode, msg_t *msg, int exclusive, int channel, int nt, struct misdn_bchannel *bc)
{
	unsigned char *p;
	Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
	int l;
	struct misdn_stack *stack=get_stack_by_bc(bc);
	int pri = stack->pri;
	
	if (exclusive<0 || exclusive>1)
	{
		printf("%s: ERROR: exclusive(%d) is out of range.\n", __FUNCTION__, exclusive);
		return;
	}
	if ((channel<0 || channel>0xff)
	    || (!pri && (channel>2 && channel<0xff))
	    || (pri && (channel>31 && channel<0xff))
	    || (pri && channel==16))
	{
		printf("%s: ERROR: channel(%d) is out of range.\n", __FUNCTION__, channel);
		return;
	}

	/* if (MISDN_IE_DEBG) printf("    exclusive=%d channel=%d\n", exclusive, channel); */
	

	if (!pri)
	{
		/* BRI */
		l = 1;
		p = msg_put(msg, l+2);
		if (nt)
			*ntmode = p+1;
		else
			qi->QI_ELEMENT(channel_id) = p - (unsigned char *)qi - sizeof(Q931_info_t);
		p[0] = IE_CHANNEL_ID;
		p[1] = l;
		if (channel == 0xff)
			channel = 3;
		p[2] = 0x80 + (exclusive<<3) + channel;
		/* printf("    exclusive=%d channel=%d\n", exclusive, channel); */
	} else
	{
		/* PRI */
		if (channel == 0) /* no channel */
			return; /* IE not present */
/* 		if (MISDN_IE_DEBG) printf("channel = %d\n", channel); */
		if (channel == 0xff) /* any channel */
		{
			l = 1;
			p = msg_put(msg, l+2);
			if (nt)
				*ntmode = p+1;
			else
				qi->QI_ELEMENT(channel_id) = p - (unsigned char *)qi - sizeof(Q931_info_t);
			p[0] = IE_CHANNEL_ID;
			p[1] = l;
			p[2] = 0x80 + 0x20 + 0x03;
/* 			if (MISDN_IE_DEBG) printf("%02x\n", p[2]); */
			return; /* end */
		}
		l = 3;
		p = msg_put(msg, l+2);
		if (nt)
			*ntmode = p+1;
		else
			qi->QI_ELEMENT(channel_id) = p - (unsigned char *)qi - sizeof(Q931_info_t);
		p[0] = IE_CHANNEL_ID;
		p[1] = l;
		p[2] = 0x80 + 0x20 + (exclusive<<3) + 0x01;
		p[3] = 0x80 + 3; /* CCITT, Number, B-type */
		p[4] = 0x80 + channel;
/* 		if (MISDN_IE_DEBG) printf("%02x %02x %02x\n", p[2], p[3], p[4]); */
	}
}

static void dec_ie_channel_id(unsigned char *p, Q931_info_t *qi, int *exclusive, int *channel, int nt, struct misdn_bchannel *bc)
{
	struct misdn_stack *stack=get_stack_by_bc(bc);
	int pri =stack->pri;

	*exclusive = -1;
	*channel = -1;

	if (!nt)
	{
		p = NULL;
		if (qi->QI_ELEMENT(channel_id))
			p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(channel_id) + 1;
	}
	if (!p)
		return;
	if (p[0] < 1)
	{
		printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
		return;
	}

	if (p[1] & 0x40)
	{
		printf("%s: ERROR: refering to channels of other interfaces is not supported.\n", __FUNCTION__);
		return;
	}
	if (p[1] & 0x04)
	{
		printf("%s: ERROR: using d-channel is not supported.\n", __FUNCTION__);
		return;
	}

	*exclusive = (p[1]&0x08) >> 3;
	if (!pri)
	{
		/* BRI */
		if (p[1] & 0x20)
		{
			printf("%s: ERROR: extended channel ID with non PRI interface.\n", __FUNCTION__);
			return;
		}
		*channel = p[1] & 0x03;
		if (*channel == 3)
			*channel = 0xff;
	} else
	{
		/* PRI */
		if (p[0] < 1)
		{
			printf("%s: ERROR: IE too short for PRI (%d).\n", __FUNCTION__, p[0]);
			return;
		}
		if (!(p[1] & 0x20))
		{
			printf("%s: ERROR: basic channel ID with PRI interface.\n", __FUNCTION__);
			return;
		}
		if ((p[1]&0x03) == 0x00)
		{
			/* no channel */
			*channel = 0;
			return;
		}
		if ((p[1]&0x03) == 0x03)
		{
			/* any channel */
			*channel = 0xff;
			return;
		}
		if (p[0] < 3)
		{
			printf("%s: ERROR: IE too short for PRI with channel(%d).\n", __FUNCTION__, p[0]);
			return;
		}
		if (p[2] & 0x10)
		{
			printf("%s: ERROR: channel map not supported.\n", __FUNCTION__);
			return;
		}
		*channel = p[3] & 0x7f;
		if ( (*channel<1) | (*channel==16) | (*channel>31))
		{
			printf("%s: ERROR: PRI interface channel out of range (%d).\n", __FUNCTION__, *channel);
			return;
		}
/* 		if (MISDN_IE_DEBG) printf("%02x %02x %02x\n", p[1], p[2], p[3]); */
	}

	if (MISDN_IE_DEBG) printf("    exclusive=%d channel=%d\n", *exclusive, *channel);
}


/* IE_DATE */
static void enc_ie_date(unsigned char **ntmode, msg_t *msg, time_t ti, int nt, struct misdn_bchannel *bc)
{
	unsigned char *p;
	Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
	int l;

	struct tm *tm;

	tm = localtime(&ti);
	if (!tm)
	{
		printf("%s: ERROR: gettimeofday() returned NULL.\n", __FUNCTION__);
		return;
	}

	if (MISDN_IE_DEBG) printf("    year=%d month=%d day=%d hour=%d minute=%d\n", tm->tm_year%100, tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min);

	l = 5;
	p = msg_put(msg, l+2);
	if (nt)
		*ntmode = p+1;
	else
		qi->QI_ELEMENT(date) = p - (unsigned char *)qi - sizeof(Q931_info_t);
	p[0] = IE_DATE;
	p[1] = l;
	p[2] = tm->tm_year % 100;
	p[3] = tm->tm_mon + 1;
	p[4] = tm->tm_mday;
	p[5] = tm->tm_hour;
	p[6] = tm->tm_min;
}


/* IE_DISPLAY */
static void enc_ie_display(unsigned char **ntmode, msg_t *msg, char *display, int nt, struct misdn_bchannel *bc)
{
	unsigned char *p;
	Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
	int l;

	if (!display[0])
	{
		printf("%s: ERROR: display text not given.\n", __FUNCTION__);
		return;
	}

	if (strlen((char *)display) > 80)
	{
		printf("%s: WARNING: display text too long (max 80 chars), cutting.\n", __FUNCTION__);
		display[80] = '\0';
	}

	/* if (MISDN_IE_DEBG) printf("    display='%s' (len=%d)\n", display, strlen((char *)display)); */

	l = strlen((char *)display);
	p = msg_put(msg, l+2);
	if (nt)
		*ntmode = p+1;
	else
		qi->QI_ELEMENT(display) = p - (unsigned char *)qi - sizeof(Q931_info_t);
	p[0] = IE_DISPLAY;
	p[1] = l;
	strncpy((char *)p+2, (char *)display, strlen((char *)display));
}

#if 0
static void dec_ie_display(unsigned char *p, Q931_info_t *qi, char *display, int display_len, int nt, struct misdn_bchannel *bc)
{
	*display = '\0';

	if (!nt)
	{
		p = NULL;
		if (qi->QI_ELEMENT(display))
			p = (unsigned char *)qi + sizeof(Q931_info_t) + qi->QI_ELEMENT(display) + 1;
	}
	if (!p)
		return;
	if (p[0] < 1)
	{
		printf("%s: ERROR: IE too short (%d).\n", __FUNCTION__, p[0]);
		return;
	}

	strnncpy(display, (char *)p+1, p[0], display_len);

	if (MISDN_IE_DEBG) printf("    display='%s'\n", display);
}
#endif

/* IE_KEYPAD */
#if 1
static void enc_ie_keypad(unsigned char **ntmode, msg_t *msg, char *keypad, int nt, struct misdn_bchannel *bc)
{
	unsigned char *p;
	Q931_info_t *qi = (Q931_info_t *)(msg->data + mISDN_HEADER_LEN);
	int l;

	if (!keypad[0])
	{
		printf("%s: ERROR: keypad info not given.\n", __FUNCTION__);