lib/dns/message.c

31 #include <isc/buffer.h>
103  * This is the size of each individual scratchpad buffer, and the numbers
262  * Allocate a new dynamic buffer, and attach it to this message as the
263  * "current" buffer.  (which is always the last on the list, for our
404 	m->buffer = NULL;
649 	 * cleanup the buffer cleanup list
827 	dns_name_t *curr;
829 	for (curr = ISC_LIST_TAIL(*section);
830 	     curr != NULL;
831 	     curr = ISC_LIST_PREV(curr, link)) {
832 		if (dns_name_equal(curr, target)) {
834 				*foundname = curr;
847 	dns_rdataset_t *curr;
853 	for (curr = ISC_LIST_TAIL(name->list);
854 	     curr != NULL;
855 	     curr = ISC_LIST_PREV(curr, link)) {
856 		if (curr->rdclass == rdclass &&
857 		    curr->type == type && curr->covers == covers) {
859 				*rdataset = curr;
871 	dns_rdataset_t *curr;
878 	for (curr = ISC_LIST_TAIL(name->list);
879 	     curr != NULL;
880 	     curr = ISC_LIST_PREV(curr, link)) {
881 		if (curr->type == type && curr->covers == covers) {
883 				*rdataset = curr;
892  * Read a name from buffer "source".
905 	 * First try:  use current buffer.
906 	 * Second try:  allocate a new buffer and use that.
946 	 * First try:  use current buffer.
947 	 * Second try:  allocate a new buffer of size
950 	 * Subsequent tries: double buffer size on each try.
1307 		 * ... now get ttl and rdatalen, and check buffer.
1685 			isc_buffer_t *buffer)
1690 	REQUIRE(buffer != NULL);
1691 	REQUIRE(msg->buffer == NULL);
1697 	 * Erase the contents of this buffer.
1699 	isc_buffer_clear(buffer);
1703 	 * buffer.
1705 	isc_buffer_availableregion(buffer, &r);
1713 	 * Reserve enough space for the header in this buffer.
1715 	isc_buffer_add(buffer, DNS_MESSAGE_HEADERLEN);
1717 	msg->buffer = buffer;
1723 dns_message_renderchangebuffer(dns_message_t *msg, isc_buffer_t *buffer) {
1727 	REQUIRE(buffer != NULL);
1728 	REQUIRE(msg->buffer != NULL);
1731 	 * Ensure that the new buffer is empty, and has enough space to
1734 	isc_buffer_clear(buffer);
1736 	isc_buffer_availableregion(buffer, &rn);
1737 	isc_buffer_usedregion(msg->buffer, &r);
1741 	 * Copy the contents from the old to the new buffer.
1743 	isc_buffer_add(buffer, r.length);
1746 	msg->buffer = buffer;
1765 	if (msg->buffer != NULL) {
1766 		isc_buffer_availableregion(msg->buffer, &r);
1854 	REQUIRE(msg->buffer != NULL);
1878 	 * Shrink the space in the buffer by the reserved amount.
1880 	msg->buffer->length -= msg->reserved;
1896 			st = *(msg->buffer);
1902 								    msg->buffer,
1912 								   msg->buffer,
1920 				msg->buffer->length += msg->reserved;
1930 				*(msg->buffer) = st;  /* rollback */
1931 				msg->buffer->length += msg->reserved;
1942 			msg->buffer->length += msg->reserved;
1982 				st = *(msg->buffer);
1990 							  msg->buffer,
2001 							  msg->buffer,
2023 					msg->buffer->length += msg->reserved;
2031 					*(msg->buffer) = st;  /* rollback */
2032 					msg->buffer->length += msg->reserved;
2059 	msg->buffer->length += msg->reserved;
2107 	REQUIRE(msg->buffer != NULL);
2133 					     msg->cctx, msg->buffer, 0,
2152 		buf = msg->buffer;
2154 		msg->buffer = buf;
2155 		isc_buffer_clear(msg->buffer);
2156 		isc_buffer_add(msg->buffer, DNS_MESSAGE_HEADERLEN);
2175 					     msg->cctx, msg->buffer, 0,
2198 					     msg->cctx, msg->buffer, 0,
2205 	isc_buffer_usedregion(msg->buffer, &r);
2210 	msg->buffer = NULL;  /* forget about this buffer only on success XXX */
2228 	msg->buffer = NULL;
2494 	isc_buffer_t buffer;
2500 	buffer = *source;
2502 	isc_buffer_remainingregion(&buffer, &r);
2506 	id = isc_buffer_getuint16(&buffer);
2507 	flags = isc_buffer_getuint16(&buffer);
2875 dns_message_takebuffer(dns_message_t *msg, isc_buffer_t **buffer) {
2877 	REQUIRE(buffer != NULL);
2878 	REQUIRE(ISC_BUFFER_VALID(*buffer));
2880 	ISC_LIST_APPEND(msg->cleanup, *buffer, link);
2881 	*buffer = NULL;