rr_type *
packet_read_rr(region_type *region, domain_table_type *owners,
buffer_type *packet, int question_section)
{
const dname_type *owner;
uint16_t rdlength;
ssize_t rdata_count;
rdata_atom_type *rdatas;
rr_type *result = (rr_type *) region_alloc(region, sizeof(rr_type));
owner = dname_make_from_packet(region, packet, 1, 1);
if (!owner || !buffer_available(packet, 2*sizeof(uint16_t))) {
return NULL;
}
result->owner = domain_table_insert(owners, owner);
result->type = buffer_read_u16(packet);
result->klass = buffer_read_u16(packet);
if (question_section) {
result->ttl = 0;
result->rdata_count = 0;
result->rdatas = NULL;
return result;
} else if (!buffer_available(packet, sizeof(uint32_t) + sizeof(uint16_t))) {
return NULL;
}
result->ttl = buffer_read_u32(packet);
rdlength = buffer_read_u16(packet);
if (!buffer_available(packet, rdlength)) {
return NULL;
}
rdata_count = rdata_wireformat_to_rdata_atoms(
region, owners, result->type, rdlength, packet, &rdatas);
if (rdata_count == -1) {
return NULL;
}
result->rdata_count = rdata_count;
result->rdatas = rdatas;
return result;
}
ssize_t
rdata_wireformat_to_rdata_atoms(region_type *region,
domain_table_type *owners,
uint16_t rrtype,
uint16_t data_size,
buffer_type *packet,
rdata_atom_type **rdatas)
{
size_t end = buffer_position(packet) + data_size;
size_t i;
rdata_atom_type temp_rdatas[MAXRDATALEN];
rrtype_descriptor_type *descriptor = rrtype_descriptor_by_type(rrtype);
region_type *temp_region;
assert(descriptor->maximum <= MAXRDATALEN);
if (!buffer_available(packet, data_size)) {
return -1;
}
temp_region = region_create(xalloc, free);
for (i = 0; i < descriptor->maximum; ++i) {
int is_domain = 0;
int is_normalized = 0;
int is_wirestore = 0;
size_t length = 0;
int required = i < descriptor->minimum;
switch (rdata_atom_wireformat_type(rrtype, i)) {
case RDATA_WF_COMPRESSED_DNAME:
case RDATA_WF_UNCOMPRESSED_DNAME:
is_domain = 1;
is_normalized = 1;
break;
case RDATA_WF_LITERAL_DNAME:
is_domain = 1;
is_wirestore = 1;
break;
case RDATA_WF_BYTE:
length = sizeof(uint8_t);
break;
case RDATA_WF_SHORT:
length = sizeof(uint16_t);
break;
case RDATA_WF_LONG:
length = sizeof(uint32_t);
break;
case RDATA_WF_TEXTS:
case RDATA_WF_LONG_TEXT:
length = end - buffer_position(packet);
break;
case RDATA_WF_TEXT:
case RDATA_WF_BINARYWITHLENGTH:
/* Length is stored in the first byte. */
length = 1;
if (buffer_position(packet) + length <= end) {
length += buffer_current(packet)[length - 1];
}
break;
case RDATA_WF_A:
length = sizeof(in_addr_t);
break;
case RDATA_WF_AAAA:
length = IP6ADDRLEN;
break;
case RDATA_WF_ILNP64:
length = IP6ADDRLEN/2;
break;
case RDATA_WF_EUI48:
length = EUI48ADDRLEN;
break;
case RDATA_WF_EUI64:
length = EUI64ADDRLEN;
break;
case RDATA_WF_BINARY:
/* Remaining RDATA is binary. */
length = end - buffer_position(packet);
break;
case RDATA_WF_APL:
length = (sizeof(uint16_t) /* address family */
+ sizeof(uint8_t) /* prefix */
+ sizeof(uint8_t)); /* length */
if (buffer_position(packet) + length <= end) {
/* Mask out negation bit. */
length += (buffer_current(packet)[length - 1]
& APL_LENGTH_MASK);
}
break;
case RDATA_WF_IPSECGATEWAY:
switch(rdata_atom_data(temp_rdatas[1])[0]) /* gateway type */ {
default:
case IPSECKEY_NOGATEWAY:
length = 0;
break;
case IPSECKEY_IP4:
length = IP4ADDRLEN;
break;
case IPSECKEY_IP6:
length = IP6ADDRLEN;
break;
case IPSECKEY_DNAME:
is_domain = 1;
is_normalized = 1;
is_wirestore = 1;
break;
}
break;
}
if (is_domain) {
const dname_type *dname;
if (!required && buffer_position(packet) == end) {
break;
}
dname = dname_make_from_packet(
temp_region, packet, 1, is_normalized);
if (!dname || buffer_position(packet) > end) {
/* Error in domain name. */
region_destroy(temp_region);
return -1;
}
if(is_wirestore) {
temp_rdatas[i].data = (uint16_t *) region_alloc(
region, sizeof(uint16_t) + ((size_t)dname->name_size));
temp_rdatas[i].data[0] = dname->name_size;
memcpy(temp_rdatas[i].data+1, dname_name(dname),
dname->name_size);
} else {
temp_rdatas[i].domain
= domain_table_insert(owners, dname);
temp_rdatas[i].domain->usage ++;
}
} else {
if (buffer_position(packet) + length > end) {
if (required) {
/* Truncated RDATA. */
region_destroy(temp_region);
return -1;
} else {
break;
}
}
if (!required && buffer_position(packet) == end) {
break;
}
temp_rdatas[i].data = (uint16_t *) region_alloc(
region, sizeof(uint16_t) + length);
temp_rdatas[i].data[0] = length;
buffer_read(packet, temp_rdatas[i].data + 1, length);
}
}
if (buffer_position(packet) < end) {
/* Trailing garbage. */
region_destroy(temp_region);
return -1;
}
*rdatas = (rdata_atom_type *) region_alloc_array_init(
region, temp_rdatas, i, sizeof(rdata_atom_type));
region_destroy(temp_region);
return (ssize_t)i;
}
/* return value 0: syntaxerror,badIXFR, 1:OK, 2:done_and_skip_it */
static int
apply_ixfr(namedb_type* db, FILE *in, const off_t* startpos,
const char* zone, uint32_t serialno, nsd_options_t* opt,
uint16_t id, uint32_t seq_nr, uint32_t seq_total,
int* is_axfr, int* delete_mode, int* rr_count,
size_t child_count)
{
uint32_t filelen, msglen, pkttype, timestamp[2];
int qcount, ancount, counter;
buffer_type* packet;
region_type* region;
int i;
uint16_t rrlen;
const dname_type *dname_zone, *dname;
zone_type* zone_db;
domain_type* last_in_list;
char file_zone_name[3072];
uint32_t file_serial, file_seq_nr;
uint16_t file_id;
off_t mempos;
memmove(&mempos, startpos, sizeof(off_t));
if(fseeko(in, mempos, SEEK_SET) == -1) {
log_msg(LOG_INFO, "could not fseeko: %s.", strerror(errno));
return 0;
}
/* read ixfr packet RRs and apply to in memory db */
if(!diff_read_32(in, &pkttype) || pkttype != DIFF_PART_IXFR) {
log_msg(LOG_ERR, "could not read type or wrong type");
return 0;
}
if(!diff_read_32(in, ×tamp[0]) ||
!diff_read_32(in, ×tamp[1])) {
log_msg(LOG_ERR, "could not read timestamp");
return 0;
}
if(!diff_read_32(in, &filelen)) {
log_msg(LOG_ERR, "could not read len");
return 0;
}
/* read header */
if(filelen < QHEADERSZ + sizeof(uint32_t)*3 + sizeof(uint16_t)) {
log_msg(LOG_ERR, "msg too short");
return 0;
}
region = region_create(xalloc, free);
if(!region) {
log_msg(LOG_ERR, "out of memory");
return 0;
}
if(!diff_read_str(in, file_zone_name, sizeof(file_zone_name)) ||
!diff_read_32(in, &file_serial) ||
!diff_read_16(in, &file_id) ||
!diff_read_32(in, &file_seq_nr))
{
log_msg(LOG_ERR, "could not part data");
region_destroy(region);
return 0;
}
if(strcmp(file_zone_name, zone) != 0 || serialno != file_serial ||
id != file_id || seq_nr != file_seq_nr) {
log_msg(LOG_ERR, "internal error: reading part with changed id");
region_destroy(region);
return 0;
}
msglen = filelen - sizeof(uint32_t)*3 - sizeof(uint16_t)
- strlen(file_zone_name);
packet = buffer_create(region, QIOBUFSZ);
dname_zone = dname_parse(region, zone);
zone_db = find_zone(db, dname_zone, opt, child_count);
if(!zone_db) {
log_msg(LOG_ERR, "no zone exists");
region_destroy(region);
/* break out and stop the IXFR, ignore it */
return 2;
}
if(msglen > QIOBUFSZ) {
log_msg(LOG_ERR, "msg too long");
region_destroy(region);
return 0;
}
buffer_clear(packet);
if(fread(buffer_begin(packet), msglen, 1, in) != 1) {
log_msg(LOG_ERR, "short fread: %s", strerror(errno));
region_destroy(region);
return 0;
}
buffer_set_limit(packet, msglen);
/* only answer section is really used, question, additional and
authority section RRs are skipped */
qcount = QDCOUNT(packet);
ancount = ANCOUNT(packet);
buffer_skip(packet, QHEADERSZ);
/* skip queries */
for(i=0; i<qcount; ++i)
if(!packet_skip_rr(packet, 1)) {
log_msg(LOG_ERR, "bad RR in question section");
region_destroy(region);
return 0;
}
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "diff: started packet for zone %s",
dname_to_string(dname_zone, 0)));
/* first RR: check if SOA and correct zone & serialno */
if(*rr_count == 0) {
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "diff: %s parse first RR",
dname_to_string(dname_zone, 0)));
dname = dname_make_from_packet(region, packet, 1, 1);
if(!dname) {
log_msg(LOG_ERR, "could not parse dname");
region_destroy(region);
return 0;
}
if(dname_compare(dname_zone, dname) != 0) {
log_msg(LOG_ERR, "SOA dname %s not equal to zone",
dname_to_string(dname,0));
log_msg(LOG_ERR, "zone dname is %s",
dname_to_string(dname_zone,0));
region_destroy(region);
return 0;
}
if(!buffer_available(packet, 10)) {
log_msg(LOG_ERR, "bad SOA RR");
region_destroy(region);
return 0;
}
if(buffer_read_u16(packet) != TYPE_SOA ||
buffer_read_u16(packet) != CLASS_IN) {
log_msg(LOG_ERR, "first RR not SOA IN");
region_destroy(region);
return 0;
}
buffer_skip(packet, sizeof(uint32_t)); /* ttl */
if(!buffer_available(packet, buffer_read_u16(packet)) ||
!packet_skip_dname(packet) /* skip prim_ns */ ||
!packet_skip_dname(packet) /* skip email */) {
log_msg(LOG_ERR, "bad SOA RR");
region_destroy(region);
return 0;
}
if(buffer_read_u32(packet) != serialno) {
buffer_skip(packet, -4);
log_msg(LOG_ERR, "SOA serial %d different from commit %d",
buffer_read_u32(packet), serialno);
region_destroy(region);
return 0;
}
buffer_skip(packet, sizeof(uint32_t)*4);
counter = 1;
*rr_count = 1;
*is_axfr = 0;
*delete_mode = 0;
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "diff: %s start count %d, ax %d, delmode %d",
dname_to_string(dname_zone, 0), *rr_count, *is_axfr, *delete_mode));
}
else counter = 0;
last_in_list = zone_db->apex;
for(; counter < ancount; ++counter,++(*rr_count))
{
uint16_t type, klass;
uint32_t ttl;
if(!(dname=dname_make_from_packet(region, packet, 1,1))) {
log_msg(LOG_ERR, "bad xfr RR dname %d", *rr_count);
region_destroy(region);
return 0;
}
if(!buffer_available(packet, 10)) {
log_msg(LOG_ERR, "bad xfr RR format %d", *rr_count);
region_destroy(region);
return 0;
}
type = buffer_read_u16(packet);
klass = buffer_read_u16(packet);
ttl = buffer_read_u32(packet);
rrlen = buffer_read_u16(packet);
if(!buffer_available(packet, rrlen)) {
log_msg(LOG_ERR, "bad xfr RR rdata %d, len %d have %d",
*rr_count, rrlen, (int)buffer_remaining(packet));
region_destroy(region);
return 0;
}
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "diff: %s parsed count %d, ax %d, delmode %d",
dname_to_string(dname_zone, 0), *rr_count, *is_axfr, *delete_mode));
if(*rr_count == 1 && type != TYPE_SOA) {
/* second RR: if not SOA: this is an AXFR; delete all zone contents */
delete_zone_rrs(db, zone_db);
/* add everything else (incl end SOA) */
*delete_mode = 0;
*is_axfr = 1;
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "diff: %s sawAXFR count %d, ax %d, delmode %d",
dname_to_string(dname_zone, 0), *rr_count, *is_axfr, *delete_mode));
}
if(*rr_count == 1 && type == TYPE_SOA) {
/* if the serial no of the SOA equals the serialno, then AXFR */
size_t bufpos = buffer_position(packet);
uint32_t thisserial;
if(!packet_skip_dname(packet) ||
!packet_skip_dname(packet) ||
buffer_remaining(packet) < sizeof(uint32_t)*5)
{
log_msg(LOG_ERR, "bad xfr SOA RR formerr.");
region_destroy(region);
return 0;
}
thisserial = buffer_read_u32(packet);
if(thisserial == serialno) {
/* AXFR */
delete_zone_rrs(db, zone_db);
*delete_mode = 0;
*is_axfr = 1;
}
/* must have stuff in memory for a successful IXFR,
* the serial number of the SOA has been checked
* previously (by check_for_bad_serial) if it exists */
if(!*is_axfr && !domain_find_rrset(zone_db->apex,
zone_db, TYPE_SOA)) {
log_msg(LOG_ERR, "%s SOA serial %d is not "
"in memory, skip IXFR", zone, serialno);
region_destroy(region);
/* break out and stop the IXFR, ignore it */
return 2;
}
buffer_set_position(packet, bufpos);
}
if(type == TYPE_SOA && !*is_axfr) {
/* switch from delete-part to add-part and back again,
just before soa - so it gets deleted and added too */
/* this means we switch to delete mode for the final SOA */
*delete_mode = !*delete_mode;
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "diff: %s IXFRswapdel count %d, ax %d, delmode %d",
dname_to_string(dname_zone, 0), *rr_count, *is_axfr, *delete_mode));
}
if(type == TYPE_TSIG || type == TYPE_OPT) {
/* ignore pseudo RRs */
buffer_skip(packet, rrlen);
continue;
}
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "xfr %s RR dname is %s type %s",
*delete_mode?"del":"add",
dname_to_string(dname,0), rrtype_to_string(type)));
if(*delete_mode) {
/* delete this rr */
if(!*is_axfr && type == TYPE_SOA && counter==ancount-1
&& seq_nr == seq_total-1) {
continue; /* do not delete final SOA RR for IXFR */
}
if(!delete_RR(db, dname, type, klass, last_in_list, packet,
rrlen, zone_db, region, *is_axfr)) {
region_destroy(region);
return 0;
}
if (!*is_axfr && last_in_list->nextdiff) {
last_in_list = last_in_list->nextdiff;
}
}
else
{
/* add this rr */
if(!add_RR(db, dname, type, klass, ttl, packet,
rrlen, zone_db, *is_axfr)) {
region_destroy(region);
return 0;
}
}
}
fix_empty_terminals(zone_db);
region_destroy(region);
return 1;
}
