***/
#include "utf8.h"
-
+#include "util.h"
+#include "strv.h"
+#include "unaligned.h"
#include "resolved-dns-domain.h"
#include "resolved-dns-packet.h"
-int dns_packet_new(DnsPacket **ret, size_t mtu) {
+int dns_packet_new(DnsPacket **ret, DnsProtocol protocol, size_t mtu) {
DnsPacket *p;
size_t a;
if (a < DNS_PACKET_HEADER_SIZE)
a = DNS_PACKET_HEADER_SIZE;
+ /* round up to next page size */
+ a = PAGE_ALIGN(ALIGN(sizeof(DnsPacket)) + a) - ALIGN(sizeof(DnsPacket));
+
+ /* make sure we never allocate more than useful */
+ if (a > DNS_PACKET_SIZE_MAX)
+ a = DNS_PACKET_SIZE_MAX;
+
p = malloc0(ALIGN(sizeof(DnsPacket)) + a);
if (!p)
return -ENOMEM;
p->size = p->rindex = DNS_PACKET_HEADER_SIZE;
p->allocated = a;
+ p->protocol = protocol;
p->n_ref = 1;
*ret = p;
return 0;
}
-int dns_packet_new_query(DnsPacket **ret, size_t mtu) {
+int dns_packet_new_query(DnsPacket **ret, DnsProtocol protocol, size_t mtu) {
DnsPacket *p;
DnsPacketHeader *h;
int r;
assert(ret);
- r = dns_packet_new(&p, mtu);
+ r = dns_packet_new(&p, protocol, mtu);
if (r < 0)
return r;
h = DNS_PACKET_HEADER(p);
- h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0, 0, 0, 0, 1, 0, 0, 0, 0));
+
+ if (protocol == DNS_PROTOCOL_LLMNR)
+ h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */,
+ 0 /* opcode */,
+ 0 /* c */,
+ 0 /* tc */,
+ 0 /* t */,
+ 0 /* ra */,
+ 0 /* ad */,
+ 0 /* cd */,
+ 0 /* rcode */));
+ else
+ h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */,
+ 0 /* opcode */,
+ 0 /* aa */,
+ 0 /* tc */,
+ 1 /* rd (ask for recursion) */,
+ 0 /* ra */,
+ 0 /* ad */,
+ 0 /* cd */,
+ 0 /* rcode */));
*ret = p;
return 0;
assert(p);
+ dns_question_unref(p->question);
+ dns_answer_unref(p->answer);
+
while ((s = hashmap_steal_first_key(p->names)))
free(s);
hashmap_free(p->names);
- free(p->data);
+ free(p->_data);
free(p);
}
if (p->size < DNS_PACKET_HEADER_SIZE)
return -EBADMSG;
- return 0;
+ if (p->size > DNS_PACKET_SIZE_MAX)
+ return -EBADMSG;
+
+ return 1;
}
int dns_packet_validate_reply(DnsPacket *p) {
if (r < 0)
return r;
- if (DNS_PACKET_QR(p) == 0)
+ if (DNS_PACKET_QR(p) != 1)
+ return 0;
+
+ if (DNS_PACKET_OPCODE(p) != 0)
return -EBADMSG;
+ /* RFC 4795, Section 2.1.1. says to discard all replies with QDCOUNT != 1 */
+ if (p->protocol == DNS_PROTOCOL_LLMNR &&
+ DNS_PACKET_QDCOUNT(p) != 1)
+ return -EBADMSG;
+
+ return 1;
+}
+
+int dns_packet_validate_query(DnsPacket *p) {
+ int r;
+
+ assert(p);
+
+ r = dns_packet_validate(p);
+ if (r < 0)
+ return r;
+
+ if (DNS_PACKET_QR(p) != 0)
+ return 0;
+
if (DNS_PACKET_OPCODE(p) != 0)
return -EBADMSG;
- return 0;
+ if (DNS_PACKET_TC(p))
+ return -EBADMSG;
+
+ /* RFC 4795, Section 2.1.1. says to discard all queries with QDCOUNT != 1 */
+ if (p->protocol == DNS_PROTOCOL_LLMNR &&
+ DNS_PACKET_QDCOUNT(p) != 1)
+ return -EBADMSG;
+
+ /* RFC 4795, Section 2.1.1. says to discard all queries with ANCOUNT != 0 */
+ if (DNS_PACKET_ANCOUNT(p) > 0)
+ return -EBADMSG;
+
+ /* RFC 4795, Section 2.1.1. says to discard all queries with NSCOUNT != 0 */
+ if (DNS_PACKET_NSCOUNT(p) > 0)
+ return -EBADMSG;
+
+ return 1;
}
static int dns_packet_extend(DnsPacket *p, size_t add, void **ret, size_t *start) {
assert(p);
- if (p->size + add > p->allocated)
- return -ENOMEM;
+ if (p->size + add > p->allocated) {
+ size_t a;
+
+ a = PAGE_ALIGN((p->size + add) * 2);
+ if (a > DNS_PACKET_SIZE_MAX)
+ a = DNS_PACKET_SIZE_MAX;
+
+ if (p->size + add > a)
+ return -EMSGSIZE;
+
+ if (p->_data) {
+ void *d;
+
+ d = realloc(p->_data, a);
+ if (!d)
+ return -ENOMEM;
+
+ p->_data = d;
+ } else {
+ p->_data = malloc(a);
+ if (!p->_data)
+ return -ENOMEM;
+
+ memcpy(p->_data, (uint8_t*) p + ALIGN(sizeof(DnsPacket)), p->size);
+ memzero((uint8_t*) p->_data + p->size, a - p->size);
+ }
+
+ p->allocated = a;
+ }
if (start)
*start = p->size;
p->size = sz;
}
+int dns_packet_append_blob(DnsPacket *p, const void *d, size_t l, size_t *start) {
+ void *q;
+ int r;
+
+ assert(p);
+
+ r = dns_packet_extend(p, l, &q, start);
+ if (r < 0)
+ return r;
+
+ memcpy(q, d, l);
+ return 0;
+}
+
int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start) {
void *d;
int r;
if (r < 0)
return r;
- ((uint8_t*) d)[0] = (uint8_t) (v >> 8);
- ((uint8_t*) d)[1] = (uint8_t) (v & 255);
+ unaligned_write_be16(d, v);
+
+ return 0;
+}
+
+int dns_packet_append_uint32(DnsPacket *p, uint32_t v, size_t *start) {
+ void *d;
+ int r;
+
+ assert(p);
+
+ r = dns_packet_extend(p, sizeof(uint32_t), &d, start);
+ if (r < 0)
+ return r;
+
+ unaligned_write_be32(d, v);
return 0;
}
return 0;
}
-int dns_packet_append_name(DnsPacket *p, const char *name, size_t *start) {
+int dns_packet_append_name(DnsPacket *p, const char *name,
+ bool allow_compression, size_t *start) {
size_t saved_size;
int r;
while (*name) {
_cleanup_free_ char *s = NULL;
char label[DNS_LABEL_MAX];
- size_t n;
+ size_t n = 0;
+ int k;
- n = PTR_TO_SIZE(hashmap_get(p->names, name));
+ if (allow_compression)
+ n = PTR_TO_SIZE(hashmap_get(p->names, name));
if (n > 0) {
assert(n < p->size);
if (r < 0)
goto fail;
- r = dns_packet_append_label(p, label, r, &n);
- if (r < 0)
+ if (p->protocol == DNS_PROTOCOL_DNS)
+ k = dns_label_apply_idna(label, r, label, sizeof(label));
+ else
+ k = dns_label_undo_idna(label, r, label, sizeof(label));
+ if (k < 0) {
+ r = k;
goto fail;
+ }
+ if (k > 0)
+ r = k;
- r = hashmap_ensure_allocated(&p->names, dns_name_hash_func, dns_name_compare_func);
+ r = dns_packet_append_label(p, label, r, &n);
if (r < 0)
goto fail;
- r = hashmap_put(p->names, s, SIZE_TO_PTR(n));
- if (r < 0)
- goto fail;
+ if (allow_compression) {
+ r = hashmap_ensure_allocated(&p->names, &dns_name_hash_ops);
+ if (r < 0)
+ goto fail;
+
+ r = hashmap_put(p->names, s, SIZE_TO_PTR(n));
+ if (r < 0)
+ goto fail;
- s = NULL;
+ s = NULL;
+ }
}
r = dns_packet_append_uint8(p, 0, NULL);
saved_size = p->size;
- r = dns_packet_append_name(p, k->name, NULL);
+ r = dns_packet_append_name(p, DNS_RESOURCE_KEY_NAME(k), true, NULL);
if (r < 0)
goto fail;
return r;
}
+int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start) {
+ size_t saved_size, rdlength_offset, end, rdlength;
+ int r;
+
+ assert(p);
+ assert(rr);
+
+ saved_size = p->size;
+
+ r = dns_packet_append_key(p, rr->key, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->ttl, NULL);
+ if (r < 0)
+ goto fail;
+
+ /* Initially we write 0 here */
+ r = dns_packet_append_uint16(p, 0, &rdlength_offset);
+ if (r < 0)
+ goto fail;
+
+ switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) {
+
+ case DNS_TYPE_SRV:
+ r = dns_packet_append_uint16(p, rr->srv.priority, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint16(p, rr->srv.weight, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint16(p, rr->srv.port, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_name(p, rr->srv.name, true, NULL);
+ break;
+
+ case DNS_TYPE_PTR:
+ case DNS_TYPE_NS:
+ case DNS_TYPE_CNAME:
+ case DNS_TYPE_DNAME:
+ r = dns_packet_append_name(p, rr->ptr.name, true, NULL);
+ break;
+
+ case DNS_TYPE_HINFO:
+ r = dns_packet_append_string(p, rr->hinfo.cpu, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_string(p, rr->hinfo.os, NULL);
+ break;
+
+ case DNS_TYPE_SPF: /* exactly the same as TXT */
+ case DNS_TYPE_TXT: {
+ char **s;
+
+ STRV_FOREACH(s, rr->txt.strings) {
+ r = dns_packet_append_string(p, *s, NULL);
+ if (r < 0)
+ goto fail;
+ }
+
+ r = 0;
+ break;
+ }
+
+ case DNS_TYPE_A:
+ r = dns_packet_append_blob(p, &rr->a.in_addr, sizeof(struct in_addr), NULL);
+ break;
+
+ case DNS_TYPE_AAAA:
+ r = dns_packet_append_blob(p, &rr->aaaa.in6_addr, sizeof(struct in6_addr), NULL);
+ break;
+
+ case DNS_TYPE_SOA:
+ r = dns_packet_append_name(p, rr->soa.mname, true, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_name(p, rr->soa.rname, true, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->soa.serial, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->soa.refresh, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->soa.retry, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->soa.expire, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->soa.minimum, NULL);
+ break;
+
+ case DNS_TYPE_MX:
+ r = dns_packet_append_uint16(p, rr->mx.priority, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_name(p, rr->mx.exchange, true, NULL);
+ break;
+
+ case DNS_TYPE_LOC:
+ r = dns_packet_append_uint8(p, rr->loc.version, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->loc.size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->loc.horiz_pre, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->loc.vert_pre, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->loc.latitude, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->loc.longitude, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->loc.altitude, NULL);
+ break;
+
+ case DNS_TYPE_SSHFP:
+ r = dns_packet_append_uint8(p, rr->sshfp.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->sshfp.fptype, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_blob(p, rr->sshfp.key, rr->sshfp.key_size, NULL);
+ break;
+
+ case DNS_TYPE_DNSKEY:
+ r = dns_packet_append_uint16(p, dnskey_to_flags(rr), NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, 3u, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->dnskey.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_blob(p, rr->dnskey.key, rr->dnskey.key_size, NULL);
+ break;
+
+ case DNS_TYPE_RRSIG:
+ r = dns_packet_append_uint16(p, rr->rrsig.type_covered, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->rrsig.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->rrsig.labels, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->rrsig.original_ttl, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->rrsig.expiration, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->rrsig.inception, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->rrsig.key_tag, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_name(p, rr->rrsig.signer, false, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_blob(p, rr->rrsig.signature, rr->rrsig.signature_size, NULL);
+ break;
+
+ case _DNS_TYPE_INVALID: /* unparseable */
+ default:
+
+ r = dns_packet_append_blob(p, rr->generic.data, rr->generic.size, NULL);
+ break;
+ }
+ if (r < 0)
+ goto fail;
+
+ /* Let's calculate the actual data size and update the field */
+ rdlength = p->size - rdlength_offset - sizeof(uint16_t);
+ if (rdlength > 0xFFFF) {
+ r = ENOSPC;
+ goto fail;
+ }
+
+ end = p->size;
+ p->size = rdlength_offset;
+ r = dns_packet_append_uint16(p, rdlength, NULL);
+ if (r < 0)
+ goto fail;
+ p->size = end;
+
+ if (start)
+ *start = saved_size;
+
+ return 0;
+
+fail:
+ dns_packet_truncate(p, saved_size);
+ return r;
+}
+
+
int dns_packet_read(DnsPacket *p, size_t sz, const void **ret, size_t *start) {
assert(p);
return 0;
}
-static void dns_packet_rewind(DnsPacket *p, size_t idx) {
+void dns_packet_rewind(DnsPacket *p, size_t idx) {
assert(p);
assert(idx <= p->size);
assert(idx >= DNS_PACKET_HEADER_SIZE);
p->rindex = idx;
}
+int dns_packet_read_blob(DnsPacket *p, void *d, size_t sz, size_t *start) {
+ const void *q;
+ int r;
+
+ assert(p);
+ assert(d);
+
+ r = dns_packet_read(p, sz, &q, start);
+ if (r < 0)
+ return r;
+
+ memcpy(d, q, sz);
+ return 0;
+}
+
int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start) {
const void *d;
int r;
if (r < 0)
return r;
- *ret = (((uint16_t) ((uint8_t*) d)[0]) << 8) |
- ((uint16_t) ((uint8_t*) d)[1]);
+ *ret = unaligned_read_be16(d);
+
return 0;
}
if (r < 0)
return r;
- *ret = (((uint32_t) ((uint8_t*) d)[0]) << 24) |
- (((uint32_t) ((uint8_t*) d)[1]) << 16) |
- (((uint32_t) ((uint8_t*) d)[2]) << 8) |
- ((uint32_t) ((uint8_t*) d)[3]);
+ *ret = unaligned_read_be32(d);
return 0;
}
return r;
}
-int dns_packet_read_name(DnsPacket *p, char **_ret, size_t *start) {
- size_t saved_rindex, after_rindex = 0;
+int dns_packet_read_name(DnsPacket *p, char **_ret,
+ bool allow_compression, size_t *start) {
+ size_t saved_rindex, after_rindex = 0, jump_barrier;
_cleanup_free_ char *ret = NULL;
size_t n = 0, allocated = 0;
bool first = true;
assert(_ret);
saved_rindex = p->rindex;
+ jump_barrier = p->rindex;
for (;;) {
uint8_t c, d;
else
first = false;
- memcpy(ret + n, t, c);
+ memcpy(ret + n, t, r);
n += r;
continue;
- } else if ((c & 0xc0) == 0xc0) {
+ } else if (allow_compression && (c & 0xc0) == 0xc0) {
uint16_t ptr;
/* Pointer */
goto fail;
ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d;
- if (ptr < DNS_PACKET_HEADER_SIZE || ptr >= saved_rindex) {
+ if (ptr < DNS_PACKET_HEADER_SIZE || ptr >= jump_barrier) {
r = -EBADMSG;
goto fail;
}
if (after_rindex == 0)
after_rindex = p->rindex;
+ /* Jumps are limited to a "prior occurence" (RFC-1035 4.1.4) */
+ jump_barrier = ptr;
p->rindex = ptr;
- } else
+ } else {
+ r = -EBADMSG;
goto fail;
+ }
}
if (!GREEDY_REALLOC(ret, allocated, n + 1)) {
return r;
}
-int dns_packet_read_key(DnsPacket *p, DnsResourceKey *ret, size_t *start) {
- _cleanup_(dns_resource_key_free) DnsResourceKey k = {};
+int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
+ _cleanup_free_ char *name = NULL;
+ uint16_t class, type;
+ DnsResourceKey *key;
size_t saved_rindex;
int r;
saved_rindex = p->rindex;
- r = dns_packet_read_name(p, &k.name, NULL);
+ r = dns_packet_read_name(p, &name, true, NULL);
if (r < 0)
goto fail;
- r = dns_packet_read_uint16(p, &k.type, NULL);
+ r = dns_packet_read_uint16(p, &type, NULL);
if (r < 0)
goto fail;
- r = dns_packet_read_uint16(p, &k.class, NULL);
+ r = dns_packet_read_uint16(p, &class, NULL);
if (r < 0)
goto fail;
- *ret = k;
- zero(k);
+ key = dns_resource_key_new_consume(class, type, name);
+ if (!key) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ name = NULL;
+ *ret = key;
if (start)
*start = saved_rindex;
return r;
}
+static int dns_packet_read_public_key(DnsPacket *p, size_t length,
+ void **dp, size_t *lengthp,
+ size_t *start) {
+ int r;
+ const void *d;
+ void *d2;
+
+ r = dns_packet_read(p, length, &d, NULL);
+ if (r < 0)
+ return r;
+
+ d2 = memdup(d, length);
+ if (!d2)
+ return -ENOMEM;
+
+ *dp = d2;
+ *lengthp = length;
+ return 0;
+}
+
+static bool loc_size_ok(uint8_t size) {
+ uint8_t m = size >> 4, e = size & 0xF;
+
+ return m <= 9 && e <= 9 && (m > 0 || e == 0);
+}
+
+static int dnskey_parse_flags(DnsResourceRecord *rr, uint16_t flags) {
+ assert(rr);
+
+ if (flags & ~(DNSKEY_FLAG_SEP | DNSKEY_FLAG_ZONE_KEY))
+ return -EBADMSG;
+
+ rr->dnskey.zone_key_flag = flags & DNSKEY_FLAG_ZONE_KEY;
+ rr->dnskey.sep_flag = flags & DNSKEY_FLAG_SEP;
+ return 0;
+}
+
int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
- _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr;
+ _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
size_t saved_rindex, offset;
uint16_t rdlength;
const void *d;
assert(p);
assert(ret);
- rr = dns_resource_record_new();
- if (!rr)
- return -ENOMEM;
-
saved_rindex = p->rindex;
- r = dns_packet_read_key(p, &rr->key, NULL);
+ r = dns_packet_read_key(p, &key, NULL);
if (r < 0)
goto fail;
+ if (key->class == DNS_CLASS_ANY ||
+ key->type == DNS_TYPE_ANY) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ rr = dns_resource_record_new(key);
+ if (!rr) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
r = dns_packet_read_uint32(p, &rr->ttl, NULL);
if (r < 0)
goto fail;
offset = p->rindex;
- switch (rr->key.type) {
+ switch (rr->key->type) {
+
+ case DNS_TYPE_SRV:
+ r = dns_packet_read_uint16(p, &rr->srv.priority, NULL);
+ if (r < 0)
+ goto fail;
+ r = dns_packet_read_uint16(p, &rr->srv.weight, NULL);
+ if (r < 0)
+ goto fail;
+ r = dns_packet_read_uint16(p, &rr->srv.port, NULL);
+ if (r < 0)
+ goto fail;
+ r = dns_packet_read_name(p, &rr->srv.name, true, NULL);
+ break;
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
- r = dns_packet_read_name(p, &rr->ptr.name, NULL);
+ case DNS_TYPE_DNAME:
+ r = dns_packet_read_name(p, &rr->ptr.name, true, NULL);
break;
case DNS_TYPE_HINFO:
r = dns_packet_read_string(p, &rr->hinfo.os, NULL);
break;
+ case DNS_TYPE_SPF: /* exactly the same as TXT */
+ case DNS_TYPE_TXT: {
+ char *s;
+
+ /* RFC 1035 says that TXT must be at least one
+ string. Reject empty records. */
+ if (!rdlength) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ while (p->rindex < offset + rdlength) {
+ r = dns_packet_read_string(p, &s, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = strv_consume(&rr->txt.strings, s);
+ if (r < 0)
+ goto fail;
+ }
+
+ r = 0;
+ break;
+ }
+
case DNS_TYPE_A:
- r = dns_packet_read(p, sizeof(struct in_addr), &d, NULL);
+ r = dns_packet_read_blob(p, &rr->a.in_addr, sizeof(struct in_addr), NULL);
+ break;
+
+ case DNS_TYPE_AAAA:
+ r = dns_packet_read_blob(p, &rr->aaaa.in6_addr, sizeof(struct in6_addr), NULL);
+ break;
+
+ case DNS_TYPE_SOA:
+ r = dns_packet_read_name(p, &rr->soa.mname, true, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_name(p, &rr->soa.rname, true, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->soa.serial, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->soa.refresh, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->soa.retry, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->soa.expire, NULL);
if (r < 0)
goto fail;
- memcpy(&rr->a.in_addr, d, sizeof(struct in_addr));
+ r = dns_packet_read_uint32(p, &rr->soa.minimum, NULL);
break;
- case DNS_TYPE_AAAA:
- r = dns_packet_read(p, sizeof(struct in6_addr), &d, NULL);
+ case DNS_TYPE_MX:
+ r = dns_packet_read_uint16(p, &rr->mx.priority, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_name(p, &rr->mx.exchange, true, NULL);
+ break;
+
+ case DNS_TYPE_LOC: {
+ uint8_t t;
+ size_t pos;
+
+ r = dns_packet_read_uint8(p, &t, &pos);
+ if (r < 0)
+ goto fail;
+
+ if (t == 0) {
+ rr->loc.version = t;
+
+ r = dns_packet_read_uint8(p, &rr->loc.size, NULL);
+ if (r < 0)
+ goto fail;
+
+ if (!loc_size_ok(rr->loc.size)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ r = dns_packet_read_uint8(p, &rr->loc.horiz_pre, NULL);
+ if (r < 0)
+ goto fail;
+
+ if (!loc_size_ok(rr->loc.horiz_pre)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ r = dns_packet_read_uint8(p, &rr->loc.vert_pre, NULL);
+ if (r < 0)
+ goto fail;
+
+ if (!loc_size_ok(rr->loc.vert_pre)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ r = dns_packet_read_uint32(p, &rr->loc.latitude, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->loc.longitude, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->loc.altitude, NULL);
+ if (r < 0)
+ goto fail;
+
+ break;
+ } else {
+ dns_packet_rewind(p, pos);
+ rr->unparseable = true;
+ goto unparseable;
+ }
+ }
+
+ case DNS_TYPE_SSHFP:
+ r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &rr->sshfp.fptype, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_public_key(p, rdlength - 2,
+ &rr->sshfp.key, &rr->sshfp.key_size,
+ NULL);
+ break;
+
+ case DNS_TYPE_DNSKEY: {
+ uint16_t flags;
+ uint8_t proto;
+
+ r = dns_packet_read_uint16(p, &flags, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dnskey_parse_flags(rr, flags);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &proto, NULL);
+ if (r < 0)
+ goto fail;
+
+ /* protocol is required to be always 3 */
+ if (proto != 3) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ r = dns_packet_read_uint8(p, &rr->dnskey.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_public_key(p, rdlength - 4,
+ &rr->dnskey.key, &rr->dnskey.key_size,
+ NULL);
+ break;
+ }
+
+ case DNS_TYPE_RRSIG:
+ r = dns_packet_read_uint16(p, &rr->rrsig.type_covered, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &rr->rrsig.algorithm, NULL);
if (r < 0)
goto fail;
- memcpy(&rr->aaaa.in6_addr, d, sizeof(struct in6_addr));
+ r = dns_packet_read_uint8(p, &rr->rrsig.labels, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->rrsig.original_ttl, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->rrsig.expiration, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->rrsig.inception, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint16(p, &rr->rrsig.key_tag, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_name(p, &rr->rrsig.signer, false, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_public_key(p, offset + rdlength - p->rindex,
+ &rr->rrsig.signature, &rr->rrsig.signature_size,
+ NULL);
break;
default:
+ unparseable:
r = dns_packet_read(p, rdlength, &d, NULL);
if (r < 0)
goto fail;
return r;
}
-int dns_packet_skip_question(DnsPacket *p) {
+int dns_packet_extract(DnsPacket *p) {
+ _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
+ _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
+ size_t saved_rindex;
+ unsigned n, i;
int r;
- unsigned i, n;
- assert(p);
+ if (p->extracted)
+ return 0;
+
+ saved_rindex = p->rindex;
+ dns_packet_rewind(p, DNS_PACKET_HEADER_SIZE);
n = DNS_PACKET_QDCOUNT(p);
- for (i = 0; i < n; i++) {
- _cleanup_(dns_resource_key_free) DnsResourceKey key = {};
+ if (n > 0) {
+ question = dns_question_new(n);
+ if (!question) {
+ r = -ENOMEM;
+ goto finish;
+ }
- r = dns_packet_read_key(p, &key, NULL);
- if (r < 0)
- return r;
+ for (i = 0; i < n; i++) {
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
+
+ r = dns_packet_read_key(p, &key, NULL);
+ if (r < 0)
+ goto finish;
+
+ r = dns_question_add(question, key);
+ if (r < 0)
+ goto finish;
+ }
}
- return 0;
+ n = DNS_PACKET_RRCOUNT(p);
+ if (n > 0) {
+ answer = dns_answer_new(n);
+ if (!answer) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ for (i = 0; i < n; i++) {
+ _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+
+ r = dns_packet_read_rr(p, &rr, NULL);
+ if (r < 0)
+ goto finish;
+
+ r = dns_answer_add(answer, rr);
+ if (r < 0)
+ goto finish;
+ }
+ }
+
+ p->question = question;
+ question = NULL;
+
+ p->answer = answer;
+ answer = NULL;
+
+ p->extracted = true;
+
+ r = 0;
+
+finish:
+ p->rindex = saved_rindex;
+ return r;
}
static const char* const dns_rcode_table[_DNS_RCODE_MAX_DEFINED] = {
[DNS_RCODE_BADTRUNC] = "BADTRUNC",
};
DEFINE_STRING_TABLE_LOOKUP(dns_rcode, int);
+
+static const char* const dns_protocol_table[_DNS_PROTOCOL_MAX] = {
+ [DNS_PROTOCOL_DNS] = "dns",
+ [DNS_PROTOCOL_MDNS] = "mdns",
+ [DNS_PROTOCOL_LLMNR] = "llmnr",
+};
+DEFINE_STRING_TABLE_LOOKUP(dns_protocol, DnsProtocol);
+
+static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
+ [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
+ [DNSSEC_ALGORITHM_DH] = "DH",
+ [DNSSEC_ALGORITHM_DSA] = "DSA",
+ [DNSSEC_ALGORITHM_ECC] = "ECC",
+ [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
+ [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
+ [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
+ [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
+};
+DEFINE_STRING_TABLE_LOOKUP(dnssec_algorithm, int);
~ianmdlvl / elogind.git / blobdiff