diff options
Diffstat (limited to 'src/resolve/resolved-dns-rr.c')
| -rw-r--r-- | src/resolve/resolved-dns-rr.c | 2159 |
1 files changed, 2159 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c new file mode 100644 index 0000000..00f7bea --- /dev/null +++ b/src/resolve/resolved-dns-rr.c @@ -0,0 +1,2159 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <math.h> + +#include "alloc-util.h" +#include "dns-domain.h" +#include "dns-type.h" +#include "escape.h" +#include "hexdecoct.h" +#include "memory-util.h" +#include "resolved-dns-dnssec.h" +#include "resolved-dns-packet.h" +#include "resolved-dns-rr.h" +#include "string-table.h" +#include "string-util.h" +#include "strv.h" +#include "terminal-util.h" + +DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) { + DnsResourceKey *k; + size_t l; + + assert(name); + + l = strlen(name); + k = malloc0(sizeof(DnsResourceKey) + l + 1); + if (!k) + return NULL; + + k->n_ref = 1; + k->class = class; + k->type = type; + + strcpy((char*) k + sizeof(DnsResourceKey), name); + + return k; +} + +DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) { + int r; + + assert(key); + assert(cname); + + assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME)); + + if (cname->key->type == DNS_TYPE_CNAME) + return dns_resource_key_new(key->class, key->type, cname->cname.name); + else { + _cleanup_free_ char *destination = NULL; + DnsResourceKey *k; + + r = dns_name_change_suffix(dns_resource_key_name(key), dns_resource_key_name(cname->key), cname->dname.name, &destination); + if (r < 0) + return NULL; + if (r == 0) + return dns_resource_key_ref((DnsResourceKey*) key); + + k = dns_resource_key_new_consume(key->class, key->type, destination); + if (!k) + return NULL; + + TAKE_PTR(destination); + return k; + } +} + +int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name) { + DnsResourceKey *new_key; + char *joined; + int r; + + assert(ret); + assert(key); + assert(name); + + if (dns_name_is_root(name)) { + *ret = dns_resource_key_ref(key); + return 0; + } + + r = dns_name_concat(dns_resource_key_name(key), name, 0, &joined); + if (r < 0) + return r; + + new_key = dns_resource_key_new_consume(key->class, key->type, joined); + if (!new_key) { + free(joined); + return -ENOMEM; + } + + *ret = new_key; + return 0; +} + +DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) { + DnsResourceKey *k; + + assert(name); + + k = new(DnsResourceKey, 1); + if (!k) + return NULL; + + *k = (DnsResourceKey) { + .n_ref = 1, + .class = class, + .type = type, + ._name = name, + }; + + return k; +} + +DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) { + + if (!k) + return NULL; + + /* Static/const keys created with DNS_RESOURCE_KEY_CONST will + * set this to -1, they should not be reffed/unreffed */ + assert(k->n_ref != UINT_MAX); + + assert(k->n_ref > 0); + k->n_ref++; + + return k; +} + +DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) { + if (!k) + return NULL; + + assert(k->n_ref != UINT_MAX); + assert(k->n_ref > 0); + + if (k->n_ref == 1) { + free(k->_name); + free(k); + } else + k->n_ref--; + + return NULL; +} + +const char* dns_resource_key_name(const DnsResourceKey *key) { + const char *name; + + if (!key) + return NULL; + + if (key->_name) + name = key->_name; + else + name = (char*) key + sizeof(DnsResourceKey); + + if (dns_name_is_root(name)) + return "."; + else + return name; +} + +bool dns_resource_key_is_address(const DnsResourceKey *key) { + assert(key); + + /* Check if this is an A or AAAA resource key */ + + return key->class == DNS_CLASS_IN && IN_SET(key->type, DNS_TYPE_A, DNS_TYPE_AAAA); +} + +bool dns_resource_key_is_dnssd_ptr(const DnsResourceKey *key) { + assert(key); + + /* Check if this is a PTR resource key used in + Service Instance Enumeration as described in RFC6763 p4.1. */ + + if (key->type != DNS_TYPE_PTR) + return false; + + return dns_name_endswith(dns_resource_key_name(key), "_tcp.local") || + dns_name_endswith(dns_resource_key_name(key), "_udp.local"); +} + +int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) { + int r; + + if (a == b) + return 1; + + r = dns_name_equal(dns_resource_key_name(a), dns_resource_key_name(b)); + if (r <= 0) + return r; + + if (a->class != b->class) + return 0; + + if (a->type != b->type) + return 0; + + return 1; +} + +int dns_resource_key_match_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain) { + int r; + + assert(key); + assert(rr); + + if (key == rr->key) + return 1; + + /* Checks if an rr matches the specified key. If a search + * domain is specified, it will also be checked if the key + * with the search domain suffixed might match the RR. */ + + if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) + return 0; + + if (rr->key->type != key->type && key->type != DNS_TYPE_ANY) + return 0; + + r = dns_name_equal(dns_resource_key_name(rr->key), dns_resource_key_name(key)); + if (r != 0) + return r; + + if (search_domain) { + _cleanup_free_ char *joined = NULL; + + r = dns_name_concat(dns_resource_key_name(key), search_domain, 0, &joined); + if (r < 0) + return r; + + return dns_name_equal(dns_resource_key_name(rr->key), joined); + } + + return 0; +} + +int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain) { + int r; + + assert(key); + assert(cname); + + if (cname->class != key->class && key->class != DNS_CLASS_ANY) + return 0; + + if (!dns_type_may_redirect(key->type)) + return 0; + + if (cname->type == DNS_TYPE_CNAME) + r = dns_name_equal(dns_resource_key_name(key), dns_resource_key_name(cname)); + else if (cname->type == DNS_TYPE_DNAME) + r = dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(cname)); + else + return 0; + + if (r != 0) + return r; + + if (search_domain) { + _cleanup_free_ char *joined = NULL; + + r = dns_name_concat(dns_resource_key_name(key), search_domain, 0, &joined); + if (r < 0) + return r; + + if (cname->type == DNS_TYPE_CNAME) + return dns_name_equal(joined, dns_resource_key_name(cname)); + else if (cname->type == DNS_TYPE_DNAME) + return dns_name_endswith(joined, dns_resource_key_name(cname)); + } + + return 0; +} + +int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) { + assert(soa); + assert(key); + + /* Checks whether 'soa' is a SOA record for the specified key. */ + + if (soa->class != key->class) + return 0; + + if (soa->type != DNS_TYPE_SOA) + return 0; + + return dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(soa)); +} + +static void dns_resource_key_hash_func(const DnsResourceKey *k, struct siphash *state) { + assert(k); + + dns_name_hash_func(dns_resource_key_name(k), state); + siphash24_compress(&k->class, sizeof(k->class), state); + siphash24_compress(&k->type, sizeof(k->type), state); +} + +static int dns_resource_key_compare_func(const DnsResourceKey *x, const DnsResourceKey *y) { + int r; + + r = dns_name_compare_func(dns_resource_key_name(x), dns_resource_key_name(y)); + if (r != 0) + return r; + + r = CMP(x->type, y->type); + if (r != 0) + return r; + + return CMP(x->class, y->class); +} + +DEFINE_HASH_OPS(dns_resource_key_hash_ops, DnsResourceKey, dns_resource_key_hash_func, dns_resource_key_compare_func); + +char* dns_resource_key_to_string(const DnsResourceKey *key, char *buf, size_t buf_size) { + const char *c, *t; + char *ans = buf; + + /* If we cannot convert the CLASS/TYPE into a known string, + use the format recommended by RFC 3597, Section 5. */ + + c = dns_class_to_string(key->class); + t = dns_type_to_string(key->type); + + (void) snprintf(buf, buf_size, "%s %s%s%.0u %s%s%.0u", + dns_resource_key_name(key), + strempty(c), c ? "" : "CLASS", c ? 0u : key->class, + strempty(t), t ? "" : "TYPE", t ? 0u : key->type); + + return ans; +} + +bool dns_resource_key_reduce(DnsResourceKey **a, DnsResourceKey **b) { + assert(a); + assert(b); + + /* Try to replace one RR key by another if they are identical, thus saving a bit of memory. Note that we do + * this only for RR keys, not for RRs themselves, as they carry a lot of additional metadata (where they come + * from, validity data, and suchlike), and cannot be replaced so easily by other RRs that have the same + * superficial data. */ + + if (!*a) + return false; + if (!*b) + return false; + + /* We refuse merging const keys */ + if ((*a)->n_ref == UINT_MAX) + return false; + if ((*b)->n_ref == UINT_MAX) + return false; + + /* Already the same? */ + if (*a == *b) + return true; + + /* Are they really identical? */ + if (dns_resource_key_equal(*a, *b) <= 0) + return false; + + /* Keep the one which already has more references. */ + if ((*a)->n_ref > (*b)->n_ref) + DNS_RESOURCE_KEY_REPLACE(*b, dns_resource_key_ref(*a)); + else + DNS_RESOURCE_KEY_REPLACE(*a, dns_resource_key_ref(*b)); + + return true; +} + +DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) { + DnsResourceRecord *rr; + + rr = new(DnsResourceRecord, 1); + if (!rr) + return NULL; + + *rr = (DnsResourceRecord) { + .n_ref = 1, + .key = dns_resource_key_ref(key), + .expiry = USEC_INFINITY, + .n_skip_labels_signer = UINT8_MAX, + .n_skip_labels_source = UINT8_MAX, + }; + + return rr; +} + +DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) { + _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; + + key = dns_resource_key_new(class, type, name); + if (!key) + return NULL; + + return dns_resource_record_new(key); +} + +static DnsResourceRecord* dns_resource_record_free(DnsResourceRecord *rr) { + assert(rr); + + if (rr->key) { + switch (rr->key->type) { + + case DNS_TYPE_SRV: + free(rr->srv.name); + break; + + case DNS_TYPE_PTR: + case DNS_TYPE_NS: + case DNS_TYPE_CNAME: + case DNS_TYPE_DNAME: + free(rr->ptr.name); + break; + + case DNS_TYPE_HINFO: + free(rr->hinfo.cpu); + free(rr->hinfo.os); + break; + + case DNS_TYPE_TXT: + case DNS_TYPE_SPF: + dns_txt_item_free_all(rr->txt.items); + break; + + case DNS_TYPE_SOA: + free(rr->soa.mname); + free(rr->soa.rname); + break; + + case DNS_TYPE_MX: + free(rr->mx.exchange); + break; + + case DNS_TYPE_DS: + free(rr->ds.digest); + break; + + case DNS_TYPE_SSHFP: + free(rr->sshfp.fingerprint); + break; + + case DNS_TYPE_DNSKEY: + free(rr->dnskey.key); + break; + + case DNS_TYPE_RRSIG: + free(rr->rrsig.signer); + free(rr->rrsig.signature); + break; + + case DNS_TYPE_NSEC: + free(rr->nsec.next_domain_name); + bitmap_free(rr->nsec.types); + break; + + case DNS_TYPE_NSEC3: + free(rr->nsec3.next_hashed_name); + free(rr->nsec3.salt); + bitmap_free(rr->nsec3.types); + break; + + case DNS_TYPE_LOC: + case DNS_TYPE_A: + case DNS_TYPE_AAAA: + break; + + case DNS_TYPE_TLSA: + free(rr->tlsa.data); + break; + + case DNS_TYPE_CAA: + free(rr->caa.tag); + free(rr->caa.value); + break; + + case DNS_TYPE_OPENPGPKEY: + default: + if (!rr->unparsable) + free(rr->generic.data); + } + + if (rr->unparsable) + free(rr->generic.data); + + free(rr->wire_format); + dns_resource_key_unref(rr->key); + } + + free(rr->to_string); + return mfree(rr); +} + +DEFINE_TRIVIAL_REF_UNREF_FUNC(DnsResourceRecord, dns_resource_record, dns_resource_record_free); + +int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) { + _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; + _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; + _cleanup_free_ char *ptr = NULL; + int r; + + assert(ret); + assert(address); + assert(hostname); + + r = dns_name_reverse(family, address, &ptr); + if (r < 0) + return r; + + key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr); + if (!key) + return -ENOMEM; + + ptr = NULL; + + rr = dns_resource_record_new(key); + if (!rr) + return -ENOMEM; + + rr->ptr.name = strdup(hostname); + if (!rr->ptr.name) + return -ENOMEM; + + *ret = TAKE_PTR(rr); + + return 0; +} + +int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name) { + DnsResourceRecord *rr; + + assert(ret); + assert(address); + assert(family); + + if (family == AF_INET) { + + rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, name); + if (!rr) + return -ENOMEM; + + rr->a.in_addr = address->in; + + } else if (family == AF_INET6) { + + rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_AAAA, name); + if (!rr) + return -ENOMEM; + + rr->aaaa.in6_addr = address->in6; + } else + return -EAFNOSUPPORT; + + *ret = rr; + + return 0; +} + +#define FIELD_EQUAL(a, b, field) \ + ((a).field ## _size == (b).field ## _size && \ + memcmp_safe((a).field, (b).field, (a).field ## _size) == 0) + +int dns_resource_record_payload_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) { + int r; + + /* Check if a and b are the same, but don't look at their keys */ + + if (a->unparsable != b->unparsable) + return 0; + + switch (a->unparsable ? _DNS_TYPE_INVALID : a->key->type) { + + case DNS_TYPE_SRV: + r = dns_name_equal(a->srv.name, b->srv.name); + if (r <= 0) + return r; + + return a->srv.priority == b->srv.priority && + a->srv.weight == b->srv.weight && + a->srv.port == b->srv.port; + + case DNS_TYPE_PTR: + case DNS_TYPE_NS: + case DNS_TYPE_CNAME: + case DNS_TYPE_DNAME: + return dns_name_equal(a->ptr.name, b->ptr.name); + + case DNS_TYPE_HINFO: + return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) && + strcaseeq(a->hinfo.os, b->hinfo.os); + + case DNS_TYPE_SPF: /* exactly the same as TXT */ + case DNS_TYPE_TXT: + return dns_txt_item_equal(a->txt.items, b->txt.items); + + case DNS_TYPE_A: + return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0; + + case DNS_TYPE_AAAA: + return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0; + + case DNS_TYPE_SOA: + r = dns_name_equal(a->soa.mname, b->soa.mname); + if (r <= 0) + return r; + r = dns_name_equal(a->soa.rname, b->soa.rname); + if (r <= 0) + return r; + + return a->soa.serial == b->soa.serial && + a->soa.refresh == b->soa.refresh && + a->soa.retry == b->soa.retry && + a->soa.expire == b->soa.expire && + a->soa.minimum == b->soa.minimum; + + case DNS_TYPE_MX: + if (a->mx.priority != b->mx.priority) + return 0; + + return dns_name_equal(a->mx.exchange, b->mx.exchange); + + case DNS_TYPE_LOC: + assert(a->loc.version == b->loc.version); + + return a->loc.size == b->loc.size && + a->loc.horiz_pre == b->loc.horiz_pre && + a->loc.vert_pre == b->loc.vert_pre && + a->loc.latitude == b->loc.latitude && + a->loc.longitude == b->loc.longitude && + a->loc.altitude == b->loc.altitude; + + case DNS_TYPE_DS: + return a->ds.key_tag == b->ds.key_tag && + a->ds.algorithm == b->ds.algorithm && + a->ds.digest_type == b->ds.digest_type && + FIELD_EQUAL(a->ds, b->ds, digest); + + case DNS_TYPE_SSHFP: + return a->sshfp.algorithm == b->sshfp.algorithm && + a->sshfp.fptype == b->sshfp.fptype && + FIELD_EQUAL(a->sshfp, b->sshfp, fingerprint); + + case DNS_TYPE_DNSKEY: + return a->dnskey.flags == b->dnskey.flags && + a->dnskey.protocol == b->dnskey.protocol && + a->dnskey.algorithm == b->dnskey.algorithm && + FIELD_EQUAL(a->dnskey, b->dnskey, key); + + case DNS_TYPE_RRSIG: + /* do the fast comparisons first */ + return a->rrsig.type_covered == b->rrsig.type_covered && + a->rrsig.algorithm == b->rrsig.algorithm && + a->rrsig.labels == b->rrsig.labels && + a->rrsig.original_ttl == b->rrsig.original_ttl && + a->rrsig.expiration == b->rrsig.expiration && + a->rrsig.inception == b->rrsig.inception && + a->rrsig.key_tag == b->rrsig.key_tag && + FIELD_EQUAL(a->rrsig, b->rrsig, signature) && + dns_name_equal(a->rrsig.signer, b->rrsig.signer); + + case DNS_TYPE_NSEC: + return dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name) && + bitmap_equal(a->nsec.types, b->nsec.types); + + case DNS_TYPE_NSEC3: + return a->nsec3.algorithm == b->nsec3.algorithm && + a->nsec3.flags == b->nsec3.flags && + a->nsec3.iterations == b->nsec3.iterations && + FIELD_EQUAL(a->nsec3, b->nsec3, salt) && + FIELD_EQUAL(a->nsec3, b->nsec3, next_hashed_name) && + bitmap_equal(a->nsec3.types, b->nsec3.types); + + case DNS_TYPE_TLSA: + return a->tlsa.cert_usage == b->tlsa.cert_usage && + a->tlsa.selector == b->tlsa.selector && + a->tlsa.matching_type == b->tlsa.matching_type && + FIELD_EQUAL(a->tlsa, b->tlsa, data); + + case DNS_TYPE_CAA: + return a->caa.flags == b->caa.flags && + streq(a->caa.tag, b->caa.tag) && + FIELD_EQUAL(a->caa, b->caa, value); + + case DNS_TYPE_OPENPGPKEY: + default: + return FIELD_EQUAL(a->generic, b->generic, data); + } +} + +int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) { + int r; + + assert(a); + assert(b); + + if (a == b) + return 1; + + r = dns_resource_key_equal(a->key, b->key); + if (r <= 0) + return r; + + return dns_resource_record_payload_equal(a, b); +} + +static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude, + uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) { + char *s; + char NS = latitude >= 1U<<31 ? 'N' : 'S'; + char EW = longitude >= 1U<<31 ? 'E' : 'W'; + + int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude); + int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude); + double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude); + double siz = (size >> 4) * exp10((double) (size & 0xF)); + double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF)); + double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF)); + + if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm", + (lat / 60000 / 60), + (lat / 60000) % 60, + (lat % 60000) / 1000., + NS, + (lon / 60000 / 60), + (lon / 60000) % 60, + (lon % 60000) / 1000., + EW, + alt / 100., + siz / 100., + hor / 100., + ver / 100.) < 0) + return NULL; + + return s; +} + +static int format_timestamp_dns(char *buf, size_t l, time_t sec) { + struct tm tm; + + assert(buf); + assert(l > STRLEN("YYYYMMDDHHmmSS")); + + if (!gmtime_r(&sec, &tm)) + return -EINVAL; + + if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0) + return -EINVAL; + + return 0; +} + +static char *format_types(Bitmap *types) { + _cleanup_strv_free_ char **strv = NULL; + _cleanup_free_ char *str = NULL; + unsigned type; + int r; + + BITMAP_FOREACH(type, types) { + if (dns_type_to_string(type)) { + r = strv_extend(&strv, dns_type_to_string(type)); + if (r < 0) + return NULL; + } else { + char *t; + + r = asprintf(&t, "TYPE%u", type); + if (r < 0) + return NULL; + + r = strv_consume(&strv, t); + if (r < 0) + return NULL; + } + } + + str = strv_join(strv, " "); + if (!str) + return NULL; + + return strjoin("( ", str, " )"); +} + +static char *format_txt(DnsTxtItem *first) { + size_t c = 1; + char *p, *s; + + LIST_FOREACH(items, i, first) + c += i->length * 4 + 3; + + p = s = new(char, c); + if (!s) + return NULL; + + LIST_FOREACH(items, i, first) { + if (i != first) + *(p++) = ' '; + + *(p++) = '"'; + + for (size_t j = 0; j < i->length; j++) { + if (i->data[j] < ' ' || i->data[j] == '"' || i->data[j] >= 127) { + *(p++) = '\\'; + *(p++) = '0' + (i->data[j] / 100); + *(p++) = '0' + ((i->data[j] / 10) % 10); + *(p++) = '0' + (i->data[j] % 10); + } else + *(p++) = i->data[j]; + } + + *(p++) = '"'; + } + + *p = 0; + return s; +} + +const char *dns_resource_record_to_string(DnsResourceRecord *rr) { + _cleanup_free_ char *s = NULL, *t = NULL; + char k[DNS_RESOURCE_KEY_STRING_MAX]; + int r; + + assert(rr); + + if (rr->to_string) + return rr->to_string; + + dns_resource_key_to_string(rr->key, k, sizeof(k)); + + switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) { + + case DNS_TYPE_SRV: + r = asprintf(&s, "%s %u %u %u %s", + k, + rr->srv.priority, + rr->srv.weight, + rr->srv.port, + strna(rr->srv.name)); + if (r < 0) + return NULL; + break; + + case DNS_TYPE_PTR: + case DNS_TYPE_NS: + case DNS_TYPE_CNAME: + case DNS_TYPE_DNAME: + s = strjoin(k, " ", rr->ptr.name); + if (!s) + return NULL; + + break; + + case DNS_TYPE_HINFO: + s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os); + if (!s) + return NULL; + break; + + case DNS_TYPE_SPF: /* exactly the same as TXT */ + case DNS_TYPE_TXT: + t = format_txt(rr->txt.items); + if (!t) + return NULL; + + s = strjoin(k, " ", t); + if (!s) + return NULL; + break; + + case DNS_TYPE_A: + r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &t); + if (r < 0) + return NULL; + + s = strjoin(k, " ", t); + if (!s) + return NULL; + break; + + case DNS_TYPE_AAAA: + r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t); + if (r < 0) + return NULL; + + s = strjoin(k, " ", t); + if (!s) + return NULL; + break; + + case DNS_TYPE_SOA: + r = asprintf(&s, "%s %s %s %u %u %u %u %u", + k, + strna(rr->soa.mname), + strna(rr->soa.rname), + rr->soa.serial, + rr->soa.refresh, + rr->soa.retry, + rr->soa.expire, + rr->soa.minimum); + if (r < 0) + return NULL; + break; + + case DNS_TYPE_MX: + r = asprintf(&s, "%s %u %s", + k, + rr->mx.priority, + rr->mx.exchange); + if (r < 0) + return NULL; + break; + + case DNS_TYPE_LOC: + assert(rr->loc.version == 0); + + t = format_location(rr->loc.latitude, + rr->loc.longitude, + rr->loc.altitude, + rr->loc.size, + rr->loc.horiz_pre, + rr->loc.vert_pre); + if (!t) + return NULL; + + s = strjoin(k, " ", t); + if (!s) + return NULL; + break; + + case DNS_TYPE_DS: + t = hexmem(rr->ds.digest, rr->ds.digest_size); + if (!t) + return NULL; + + r = asprintf(&s, "%s %u %u %u %s", + k, + rr->ds.key_tag, + rr->ds.algorithm, + rr->ds.digest_type, + t); + if (r < 0) + return NULL; + break; + + case DNS_TYPE_SSHFP: + t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size); + if (!t) + return NULL; + + r = asprintf(&s, "%s %u %u %s", + k, + rr->sshfp.algorithm, + rr->sshfp.fptype, + t); + if (r < 0) + return NULL; + break; + + case DNS_TYPE_DNSKEY: { + _cleanup_free_ char *alg = NULL; + uint16_t key_tag; + + key_tag = dnssec_keytag(rr, true); + + r = dnssec_algorithm_to_string_alloc(rr->dnskey.algorithm, &alg); + if (r < 0) + return NULL; + + r = asprintf(&t, "%s %u %u %s", + k, + rr->dnskey.flags, + rr->dnskey.protocol, + alg); + if (r < 0) + return NULL; + + r = base64_append(&t, r, + rr->dnskey.key, rr->dnskey.key_size, + 8, columns()); + if (r < 0) + return NULL; + + r = asprintf(&s, "%s\n" + " -- Flags:%s%s%s\n" + " -- Key tag: %u", + t, + rr->dnskey.flags & DNSKEY_FLAG_SEP ? " SEP" : "", + rr->dnskey.flags & DNSKEY_FLAG_REVOKE ? " REVOKE" : "", + rr->dnskey.flags & DNSKEY_FLAG_ZONE_KEY ? " ZONE_KEY" : "", + key_tag); + if (r < 0) + return NULL; + + break; + } + + case DNS_TYPE_RRSIG: { + _cleanup_free_ char *alg = NULL; + char expiration[STRLEN("YYYYMMDDHHmmSS") + 1], inception[STRLEN("YYYYMMDDHHmmSS") + 1]; + const char *type; + + type = dns_type_to_string(rr->rrsig.type_covered); + + r = dnssec_algorithm_to_string_alloc(rr->rrsig.algorithm, &alg); + if (r < 0) + return NULL; + + r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration); + if (r < 0) + return NULL; + + r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception); + if (r < 0) + return NULL; + + /* TYPE?? follows + * http://tools.ietf.org/html/rfc3597#section-5 */ + + r = asprintf(&s, "%s %s%.*u %s %u %u %s %s %u %s", + k, + type ?: "TYPE", + type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered, + alg, + rr->rrsig.labels, + rr->rrsig.original_ttl, + expiration, + inception, + rr->rrsig.key_tag, + rr->rrsig.signer); + if (r < 0) + return NULL; + + r = base64_append(&s, r, + rr->rrsig.signature, rr->rrsig.signature_size, + 8, columns()); + if (r < 0) + return NULL; + + break; + } + + case DNS_TYPE_NSEC: + t = format_types(rr->nsec.types); + if (!t) + return NULL; + + r = asprintf(&s, "%s %s %s", + k, + rr->nsec.next_domain_name, + t); + if (r < 0) + return NULL; + break; + + case DNS_TYPE_NSEC3: { + _cleanup_free_ char *salt = NULL, *hash = NULL; + + if (rr->nsec3.salt_size > 0) { + salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size); + if (!salt) + return NULL; + } + + hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false); + if (!hash) + return NULL; + + t = format_types(rr->nsec3.types); + if (!t) + return NULL; + + r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s", + k, + rr->nsec3.algorithm, + rr->nsec3.flags, + rr->nsec3.iterations, + rr->nsec3.salt_size > 0 ? salt : "-", + hash, + t); + if (r < 0) + return NULL; + + break; + } + + case DNS_TYPE_TLSA: + t = hexmem(rr->tlsa.data, rr->tlsa.data_size); + if (!t) + return NULL; + + r = asprintf(&s, + "%s %u %u %u %s\n" + " -- Cert. usage: %s\n" + " -- Selector: %s\n" + " -- Matching type: %s", + k, + rr->tlsa.cert_usage, + rr->tlsa.selector, + rr->tlsa.matching_type, + t, + tlsa_cert_usage_to_string(rr->tlsa.cert_usage), + tlsa_selector_to_string(rr->tlsa.selector), + tlsa_matching_type_to_string(rr->tlsa.matching_type)); + if (r < 0) + return NULL; + + break; + + case DNS_TYPE_CAA: + t = octescape(rr->caa.value, rr->caa.value_size); + if (!t) + return NULL; + + r = asprintf(&s, "%s %u %s \"%s\"%s%s%s%.0u", + k, + rr->caa.flags, + rr->caa.tag, + t, + rr->caa.flags ? "\n -- Flags:" : "", + rr->caa.flags & CAA_FLAG_CRITICAL ? " critical" : "", + rr->caa.flags & ~CAA_FLAG_CRITICAL ? " " : "", + rr->caa.flags & ~CAA_FLAG_CRITICAL); + if (r < 0) + return NULL; + + break; + + case DNS_TYPE_OPENPGPKEY: + r = asprintf(&s, "%s", k); + if (r < 0) + return NULL; + + r = base64_append(&s, r, + rr->generic.data, rr->generic.data_size, + 8, columns()); + if (r < 0) + return NULL; + break; + + default: + /* Format as documented in RFC 3597, Section 5 */ + if (rr->generic.data_size == 0) + r = asprintf(&s, "%s \\# 0", k); + else { + t = hexmem(rr->generic.data, rr->generic.data_size); + if (!t) + return NULL; + r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.data_size, t); + } + if (r < 0) + return NULL; + break; + } + + rr->to_string = s; + return TAKE_PTR(s); +} + +ssize_t dns_resource_record_payload(DnsResourceRecord *rr, void **out) { + assert(rr); + assert(out); + + switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) { + case DNS_TYPE_SRV: + case DNS_TYPE_PTR: + case DNS_TYPE_NS: + case DNS_TYPE_CNAME: + case DNS_TYPE_DNAME: + case DNS_TYPE_HINFO: + case DNS_TYPE_SPF: + case DNS_TYPE_TXT: + case DNS_TYPE_A: + case DNS_TYPE_AAAA: + case DNS_TYPE_SOA: + case DNS_TYPE_MX: + case DNS_TYPE_LOC: + case DNS_TYPE_DS: + case DNS_TYPE_DNSKEY: + case DNS_TYPE_RRSIG: + case DNS_TYPE_NSEC: + case DNS_TYPE_NSEC3: + return -EINVAL; + + case DNS_TYPE_SSHFP: + *out = rr->sshfp.fingerprint; + return rr->sshfp.fingerprint_size; + + case DNS_TYPE_TLSA: + *out = rr->tlsa.data; + return rr->tlsa.data_size; + + case DNS_TYPE_OPENPGPKEY: + default: + *out = rr->generic.data; + return rr->generic.data_size; + } +} + +int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) { + + _cleanup_(dns_packet_unref) DnsPacket packet = { + .n_ref = 1, + .protocol = DNS_PROTOCOL_DNS, + .on_stack = true, + .refuse_compression = true, + .canonical_form = canonical, + }; + + size_t start, rds; + int r; + + assert(rr); + + /* Generates the RR in wire-format, optionally in the + * canonical form as discussed in the DNSSEC RFC 4034, Section + * 6.2. We allocate a throw-away DnsPacket object on the stack + * here, because we need some book-keeping for memory + * management, and can reuse the DnsPacket serializer, that + * can generate the canonical form, too, but also knows label + * compression and suchlike. */ + + if (rr->wire_format && rr->wire_format_canonical == canonical) + return 0; + + r = dns_packet_append_rr(&packet, rr, 0, &start, &rds); + if (r < 0) + return r; + + assert(start == 0); + assert(packet._data); + + free(rr->wire_format); + rr->wire_format = TAKE_PTR(packet._data); + rr->wire_format_size = packet.size; + rr->wire_format_rdata_offset = rds; + rr->wire_format_canonical = canonical; + + return 0; +} + +int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret) { + const char *n; + int r; + + assert(rr); + assert(ret); + + /* Returns the RRset's signer, if it is known. */ + + if (rr->n_skip_labels_signer == UINT8_MAX) + return -ENODATA; + + n = dns_resource_key_name(rr->key); + r = dns_name_skip(n, rr->n_skip_labels_signer, &n); + if (r < 0) + return r; + if (r == 0) + return -EINVAL; + + *ret = n; + return 0; +} + +int dns_resource_record_source(DnsResourceRecord *rr, const char **ret) { + const char *n; + int r; + + assert(rr); + assert(ret); + + /* Returns the RRset's synthesizing source, if it is known. */ + + if (rr->n_skip_labels_source == UINT8_MAX) + return -ENODATA; + + n = dns_resource_key_name(rr->key); + r = dns_name_skip(n, rr->n_skip_labels_source, &n); + if (r < 0) + return r; + if (r == 0) + return -EINVAL; + + *ret = n; + return 0; +} + +int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone) { + const char *signer; + int r; + + assert(rr); + + r = dns_resource_record_signer(rr, &signer); + if (r < 0) + return r; + + return dns_name_equal(zone, signer); +} + +int dns_resource_record_is_synthetic(DnsResourceRecord *rr) { + int r; + + assert(rr); + + /* Returns > 0 if the RR is generated from a wildcard, and is not the asterisk name itself */ + + if (rr->n_skip_labels_source == UINT8_MAX) + return -ENODATA; + + if (rr->n_skip_labels_source == 0) + return 0; + + if (rr->n_skip_labels_source > 1) + return 1; + + r = dns_name_startswith(dns_resource_key_name(rr->key), "*"); + if (r < 0) + return r; + + return !r; +} + +void dns_resource_record_hash_func(const DnsResourceRecord *rr, struct siphash *state) { + assert(rr); + + dns_resource_key_hash_func(rr->key, state); + + switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) { + + case DNS_TYPE_SRV: + siphash24_compress(&rr->srv.priority, sizeof(rr->srv.priority), state); + siphash24_compress(&rr->srv.weight, sizeof(rr->srv.weight), state); + siphash24_compress(&rr->srv.port, sizeof(rr->srv.port), state); + dns_name_hash_func(rr->srv.name, state); + break; + + case DNS_TYPE_PTR: + case DNS_TYPE_NS: + case DNS_TYPE_CNAME: + case DNS_TYPE_DNAME: + dns_name_hash_func(rr->ptr.name, state); + break; + + case DNS_TYPE_HINFO: + string_hash_func(rr->hinfo.cpu, state); + string_hash_func(rr->hinfo.os, state); + break; + + case DNS_TYPE_TXT: + case DNS_TYPE_SPF: { + LIST_FOREACH(items, j, rr->txt.items) { + siphash24_compress_safe(j->data, j->length, state); + + /* Add an extra NUL byte, so that "a" followed by "b" doesn't result in the same hash as "ab" + * followed by "". */ + siphash24_compress_byte(0, state); + } + break; + } + + case DNS_TYPE_A: + siphash24_compress(&rr->a.in_addr, sizeof(rr->a.in_addr), state); + break; + + case DNS_TYPE_AAAA: + siphash24_compress(&rr->aaaa.in6_addr, sizeof(rr->aaaa.in6_addr), state); + break; + + case DNS_TYPE_SOA: + dns_name_hash_func(rr->soa.mname, state); + dns_name_hash_func(rr->soa.rname, state); + siphash24_compress(&rr->soa.serial, sizeof(rr->soa.serial), state); + siphash24_compress(&rr->soa.refresh, sizeof(rr->soa.refresh), state); + siphash24_compress(&rr->soa.retry, sizeof(rr->soa.retry), state); + siphash24_compress(&rr->soa.expire, sizeof(rr->soa.expire), state); + siphash24_compress(&rr->soa.minimum, sizeof(rr->soa.minimum), state); + break; + + case DNS_TYPE_MX: + siphash24_compress(&rr->mx.priority, sizeof(rr->mx.priority), state); + dns_name_hash_func(rr->mx.exchange, state); + break; + + case DNS_TYPE_LOC: + siphash24_compress(&rr->loc.version, sizeof(rr->loc.version), state); + siphash24_compress(&rr->loc.size, sizeof(rr->loc.size), state); + siphash24_compress(&rr->loc.horiz_pre, sizeof(rr->loc.horiz_pre), state); + siphash24_compress(&rr->loc.vert_pre, sizeof(rr->loc.vert_pre), state); + siphash24_compress(&rr->loc.latitude, sizeof(rr->loc.latitude), state); + siphash24_compress(&rr->loc.longitude, sizeof(rr->loc.longitude), state); + siphash24_compress(&rr->loc.altitude, sizeof(rr->loc.altitude), state); + break; + + case DNS_TYPE_SSHFP: + siphash24_compress(&rr->sshfp.algorithm, sizeof(rr->sshfp.algorithm), state); + siphash24_compress(&rr->sshfp.fptype, sizeof(rr->sshfp.fptype), state); + siphash24_compress_safe(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, state); + break; + + case DNS_TYPE_DNSKEY: + siphash24_compress(&rr->dnskey.flags, sizeof(rr->dnskey.flags), state); + siphash24_compress(&rr->dnskey.protocol, sizeof(rr->dnskey.protocol), state); + siphash24_compress(&rr->dnskey.algorithm, sizeof(rr->dnskey.algorithm), state); + siphash24_compress_safe(rr->dnskey.key, rr->dnskey.key_size, state); + break; + + case DNS_TYPE_RRSIG: + siphash24_compress(&rr->rrsig.type_covered, sizeof(rr->rrsig.type_covered), state); + siphash24_compress(&rr->rrsig.algorithm, sizeof(rr->rrsig.algorithm), state); + siphash24_compress(&rr->rrsig.labels, sizeof(rr->rrsig.labels), state); + siphash24_compress(&rr->rrsig.original_ttl, sizeof(rr->rrsig.original_ttl), state); + siphash24_compress(&rr->rrsig.expiration, sizeof(rr->rrsig.expiration), state); + siphash24_compress(&rr->rrsig.inception, sizeof(rr->rrsig.inception), state); + siphash24_compress(&rr->rrsig.key_tag, sizeof(rr->rrsig.key_tag), state); + dns_name_hash_func(rr->rrsig.signer, state); + siphash24_compress_safe(rr->rrsig.signature, rr->rrsig.signature_size, state); + break; + + case DNS_TYPE_NSEC: + dns_name_hash_func(rr->nsec.next_domain_name, state); + /* FIXME: we leave out the type bitmap here. Hash + * would be better if we'd take it into account + * too. */ + break; + + case DNS_TYPE_DS: + siphash24_compress(&rr->ds.key_tag, sizeof(rr->ds.key_tag), state); + siphash24_compress(&rr->ds.algorithm, sizeof(rr->ds.algorithm), state); + siphash24_compress(&rr->ds.digest_type, sizeof(rr->ds.digest_type), state); + siphash24_compress_safe(rr->ds.digest, rr->ds.digest_size, state); + break; + + case DNS_TYPE_NSEC3: + siphash24_compress(&rr->nsec3.algorithm, sizeof(rr->nsec3.algorithm), state); + siphash24_compress(&rr->nsec3.flags, sizeof(rr->nsec3.flags), state); + siphash24_compress(&rr->nsec3.iterations, sizeof(rr->nsec3.iterations), state); + siphash24_compress_safe(rr->nsec3.salt, rr->nsec3.salt_size, state); + siphash24_compress_safe(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, state); + /* FIXME: We leave the bitmaps out */ + break; + + case DNS_TYPE_TLSA: + siphash24_compress(&rr->tlsa.cert_usage, sizeof(rr->tlsa.cert_usage), state); + siphash24_compress(&rr->tlsa.selector, sizeof(rr->tlsa.selector), state); + siphash24_compress(&rr->tlsa.matching_type, sizeof(rr->tlsa.matching_type), state); + siphash24_compress_safe(rr->tlsa.data, rr->tlsa.data_size, state); + break; + + case DNS_TYPE_CAA: + siphash24_compress(&rr->caa.flags, sizeof(rr->caa.flags), state); + string_hash_func(rr->caa.tag, state); + siphash24_compress_safe(rr->caa.value, rr->caa.value_size, state); + break; + + case DNS_TYPE_OPENPGPKEY: + default: + siphash24_compress_safe(rr->generic.data, rr->generic.data_size, state); + break; + } +} + +int dns_resource_record_compare_func(const DnsResourceRecord *x, const DnsResourceRecord *y) { + int r; + + r = dns_resource_key_compare_func(x->key, y->key); + if (r != 0) + return r; + + if (dns_resource_record_payload_equal(x, y) > 0) + return 0; + + /* We still use CMP() here, even though don't implement proper + * ordering, since the hashtable doesn't need ordering anyway. */ + return CMP(x, y); +} + +DEFINE_HASH_OPS(dns_resource_record_hash_ops, DnsResourceRecord, dns_resource_record_hash_func, dns_resource_record_compare_func); + +DnsResourceRecord *dns_resource_record_copy(DnsResourceRecord *rr) { + _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *copy = NULL; + DnsResourceRecord *t; + + assert(rr); + + copy = dns_resource_record_new(rr->key); + if (!copy) + return NULL; + + copy->ttl = rr->ttl; + copy->expiry = rr->expiry; + copy->n_skip_labels_signer = rr->n_skip_labels_signer; + copy->n_skip_labels_source = rr->n_skip_labels_source; + copy->unparsable = rr->unparsable; + + switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) { + + case DNS_TYPE_SRV: + copy->srv.priority = rr->srv.priority; + copy->srv.weight = rr->srv.weight; + copy->srv.port = rr->srv.port; + copy->srv.name = strdup(rr->srv.name); + if (!copy->srv.name) + return NULL; + break; + + case DNS_TYPE_PTR: + case DNS_TYPE_NS: + case DNS_TYPE_CNAME: + case DNS_TYPE_DNAME: + copy->ptr.name = strdup(rr->ptr.name); + if (!copy->ptr.name) + return NULL; + break; + + case DNS_TYPE_HINFO: + copy->hinfo.cpu = strdup(rr->hinfo.cpu); + if (!copy->hinfo.cpu) + return NULL; + + copy->hinfo.os = strdup(rr->hinfo.os); + if (!copy->hinfo.os) + return NULL; + break; + + case DNS_TYPE_TXT: + case DNS_TYPE_SPF: + copy->txt.items = dns_txt_item_copy(rr->txt.items); + if (!copy->txt.items) + return NULL; + break; + + case DNS_TYPE_A: + copy->a = rr->a; + break; + + case DNS_TYPE_AAAA: + copy->aaaa = rr->aaaa; + break; + + case DNS_TYPE_SOA: + copy->soa.mname = strdup(rr->soa.mname); + if (!copy->soa.mname) + return NULL; + copy->soa.rname = strdup(rr->soa.rname); + if (!copy->soa.rname) + return NULL; + copy->soa.serial = rr->soa.serial; + copy->soa.refresh = rr->soa.refresh; + copy->soa.retry = rr->soa.retry; + copy->soa.expire = rr->soa.expire; + copy->soa.minimum = rr->soa.minimum; + break; + + case DNS_TYPE_MX: + copy->mx.priority = rr->mx.priority; + copy->mx.exchange = strdup(rr->mx.exchange); + if (!copy->mx.exchange) + return NULL; + break; + + case DNS_TYPE_LOC: + copy->loc = rr->loc; + break; + + case DNS_TYPE_SSHFP: + copy->sshfp.algorithm = rr->sshfp.algorithm; + copy->sshfp.fptype = rr->sshfp.fptype; + copy->sshfp.fingerprint = memdup(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size); + if (!copy->sshfp.fingerprint) + return NULL; + copy->sshfp.fingerprint_size = rr->sshfp.fingerprint_size; + break; + + case DNS_TYPE_DNSKEY: + copy->dnskey.flags = rr->dnskey.flags; + copy->dnskey.protocol = rr->dnskey.protocol; + copy->dnskey.algorithm = rr->dnskey.algorithm; + copy->dnskey.key = memdup(rr->dnskey.key, rr->dnskey.key_size); + if (!copy->dnskey.key) + return NULL; + copy->dnskey.key_size = rr->dnskey.key_size; + break; + + case DNS_TYPE_RRSIG: + copy->rrsig.type_covered = rr->rrsig.type_covered; + copy->rrsig.algorithm = rr->rrsig.algorithm; + copy->rrsig.labels = rr->rrsig.labels; + copy->rrsig.original_ttl = rr->rrsig.original_ttl; + copy->rrsig.expiration = rr->rrsig.expiration; + copy->rrsig.inception = rr->rrsig.inception; + copy->rrsig.key_tag = rr->rrsig.key_tag; + copy->rrsig.signer = strdup(rr->rrsig.signer); + if (!copy->rrsig.signer) + return NULL; + copy->rrsig.signature = memdup(rr->rrsig.signature, rr->rrsig.signature_size); + if (!copy->rrsig.signature) + return NULL; + copy->rrsig.signature_size = rr->rrsig.signature_size; + break; + + case DNS_TYPE_NSEC: + copy->nsec.next_domain_name = strdup(rr->nsec.next_domain_name); + if (!copy->nsec.next_domain_name) + return NULL; + if (rr->nsec.types) { + copy->nsec.types = bitmap_copy(rr->nsec.types); + if (!copy->nsec.types) + return NULL; + } + break; + + case DNS_TYPE_DS: + copy->ds.key_tag = rr->ds.key_tag; + copy->ds.algorithm = rr->ds.algorithm; + copy->ds.digest_type = rr->ds.digest_type; + copy->ds.digest = memdup(rr->ds.digest, rr->ds.digest_size); + if (!copy->ds.digest) + return NULL; + copy->ds.digest_size = rr->ds.digest_size; + break; + + case DNS_TYPE_NSEC3: + copy->nsec3.algorithm = rr->nsec3.algorithm; + copy->nsec3.flags = rr->nsec3.flags; + copy->nsec3.iterations = rr->nsec3.iterations; + copy->nsec3.salt = memdup(rr->nsec3.salt, rr->nsec3.salt_size); + if (!copy->nsec3.salt) + return NULL; + copy->nsec3.salt_size = rr->nsec3.salt_size; + copy->nsec3.next_hashed_name = memdup(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size); + if (!copy->nsec3.next_hashed_name) + return NULL; + copy->nsec3.next_hashed_name_size = rr->nsec3.next_hashed_name_size; + if (rr->nsec3.types) { + copy->nsec3.types = bitmap_copy(rr->nsec3.types); + if (!copy->nsec3.types) + return NULL; + } + break; + + case DNS_TYPE_TLSA: + copy->tlsa.cert_usage = rr->tlsa.cert_usage; + copy->tlsa.selector = rr->tlsa.selector; + copy->tlsa.matching_type = rr->tlsa.matching_type; + copy->tlsa.data = memdup(rr->tlsa.data, rr->tlsa.data_size); + if (!copy->tlsa.data) + return NULL; + copy->tlsa.data_size = rr->tlsa.data_size; + break; + + case DNS_TYPE_CAA: + copy->caa.flags = rr->caa.flags; + copy->caa.tag = strdup(rr->caa.tag); + if (!copy->caa.tag) + return NULL; + copy->caa.value = memdup(rr->caa.value, rr->caa.value_size); + if (!copy->caa.value) + return NULL; + copy->caa.value_size = rr->caa.value_size; + break; + + case DNS_TYPE_OPT: + default: + copy->generic.data = memdup(rr->generic.data, rr->generic.data_size); + if (!copy->generic.data) + return NULL; + copy->generic.data_size = rr->generic.data_size; + break; + } + + t = TAKE_PTR(copy); + + return t; +} + +int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl) { + DnsResourceRecord *old_rr, *new_rr; + uint32_t new_ttl; + + assert(rr); + old_rr = *rr; + + if (old_rr->key->type == DNS_TYPE_OPT) + return -EINVAL; + + new_ttl = MIN(old_rr->ttl, max_ttl); + if (new_ttl == old_rr->ttl) + return 0; + + if (old_rr->n_ref == 1) { + /* Patch in place */ + old_rr->ttl = new_ttl; + return 1; + } + + new_rr = dns_resource_record_copy(old_rr); + if (!new_rr) + return -ENOMEM; + + new_rr->ttl = new_ttl; + + DNS_RR_REPLACE(*rr, new_rr); + return 1; +} + +bool dns_resource_record_is_link_local_address(DnsResourceRecord *rr) { + assert(rr); + + if (rr->key->class != DNS_CLASS_IN) + return false; + + if (rr->key->type == DNS_TYPE_A) + return in4_addr_is_link_local(&rr->a.in_addr); + + if (rr->key->type == DNS_TYPE_AAAA) + return in6_addr_is_link_local(&rr->aaaa.in6_addr); + + return false; +} + +int dns_resource_record_get_cname_target(DnsResourceKey *key, DnsResourceRecord *cname, char **ret) { + _cleanup_free_ char *d = NULL; + int r; + + assert(key); + assert(cname); + + /* Checks if the RR `cname` is a CNAME/DNAME RR that matches the specified `key`. If so, returns the + * target domain. If not, returns -EUNATCH */ + + if (key->class != cname->key->class && key->class != DNS_CLASS_ANY) + return -EUNATCH; + + if (!dns_type_may_redirect(key->type)) /* This key type is not subject to CNAME/DNAME redirection? + * Then let's refuse right-away */ + return -EUNATCH; + + if (cname->key->type == DNS_TYPE_CNAME) { + r = dns_name_equal(dns_resource_key_name(key), + dns_resource_key_name(cname->key)); + if (r < 0) + return r; + if (r == 0) + return -EUNATCH; /* CNAME RR key doesn't actually match the original key */ + + d = strdup(cname->cname.name); + if (!d) + return -ENOMEM; + + } else if (cname->key->type == DNS_TYPE_DNAME) { + + r = dns_name_change_suffix( + dns_resource_key_name(key), + dns_resource_key_name(cname->key), + cname->dname.name, + &d); + if (r < 0) + return r; + if (r == 0) + return -EUNATCH; /* DNAME RR key doesn't actually match the original key */ + + } else + return -EUNATCH; /* Not a CNAME/DNAME RR, hence doesn't match the proposition either */ + + *ret = TAKE_PTR(d); + return 0; +} + +DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *first) { + LIST_FOREACH(items, i, first) + free(i); + + return NULL; +} + +bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) { + DnsTxtItem *bb = b; + + if (a == b) + return true; + + LIST_FOREACH(items, aa, a) { + if (!bb) + return false; + + if (memcmp_nn(aa->data, aa->length, bb->data, bb->length) != 0) + return false; + + bb = bb->items_next; + } + + return !bb; +} + +DnsTxtItem *dns_txt_item_copy(DnsTxtItem *first) { + DnsTxtItem *copy = NULL, *end = NULL; + + LIST_FOREACH(items, i, first) { + DnsTxtItem *j; + + j = memdup(i, offsetof(DnsTxtItem, data) + i->length + 1); + if (!j) + return dns_txt_item_free_all(copy); + + LIST_INSERT_AFTER(items, copy, end, j); + end = j; + } + + return copy; +} + +int dns_txt_item_new_empty(DnsTxtItem **ret) { + DnsTxtItem *i; + + assert(ret); + + /* RFC 6763, section 6.1 suggests to treat + * empty TXT RRs as equivalent to a TXT record + * with a single empty string. */ + + i = malloc0(offsetof(DnsTxtItem, data) + 1); /* for safety reasons we add an extra NUL byte */ + if (!i) + return -ENOMEM; + + *ret = i; + return 0; +} + +int dns_resource_record_new_from_raw(DnsResourceRecord **ret, const void *data, size_t size) { + _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; + int r; + + r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0, DNS_PACKET_SIZE_MAX); + if (r < 0) + return r; + + p->refuse_compression = true; + + r = dns_packet_append_blob(p, data, size, NULL); + if (r < 0) + return r; + + return dns_packet_read_rr(p, ret, NULL, NULL); +} + +int dns_resource_key_to_json(DnsResourceKey *key, JsonVariant **ret) { + assert(key); + assert(ret); + + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("class", JSON_BUILD_INTEGER(key->class)), + JSON_BUILD_PAIR("type", JSON_BUILD_INTEGER(key->type)), + JSON_BUILD_PAIR("name", JSON_BUILD_STRING(dns_resource_key_name(key))))); +} + +int dns_resource_key_from_json(JsonVariant *v, DnsResourceKey **ret) { + _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; + uint16_t type = 0, class = 0; + const char *name = NULL; + int r; + + JsonDispatch dispatch_table[] = { + { "class", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint16, PTR_TO_SIZE(&class), JSON_MANDATORY }, + { "type", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint16, PTR_TO_SIZE(&type), JSON_MANDATORY }, + { "name", JSON_VARIANT_STRING, json_dispatch_const_string, PTR_TO_SIZE(&name), JSON_MANDATORY }, + {} + }; + + assert(v); + assert(ret); + + r = json_dispatch(v, dispatch_table, 0, NULL); + if (r < 0) + return r; + + key = dns_resource_key_new(class, type, name); + if (!key) + return -ENOMEM; + + *ret = TAKE_PTR(key); + return 0; +} + +static int type_bitmap_to_json(Bitmap *b, JsonVariant **ret) { + _cleanup_(json_variant_unrefp) JsonVariant *l = NULL; + unsigned t; + int r; + + assert(ret); + + BITMAP_FOREACH(t, b) { + _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; + + r = json_variant_new_unsigned(&v, t); + if (r < 0) + return r; + + r = json_variant_append_array(&l, v); + if (r < 0) + return r; + } + + if (!l) + return json_variant_new_array(ret, NULL, 0); + + *ret = TAKE_PTR(l); + return 0; +} + +static int txt_to_json(DnsTxtItem *items, JsonVariant **ret) { + JsonVariant **elements = NULL; + size_t n = 0; + int r; + + assert(ret); + + LIST_FOREACH(items, i, items) { + if (!GREEDY_REALLOC(elements, n + 1)) { + r = -ENOMEM; + goto finalize; + } + + r = json_variant_new_octescape(elements + n, i->data, i->length); + if (r < 0) + goto finalize; + + n++; + } + + r = json_variant_new_array(ret, elements, n); + +finalize: + for (size_t i = 0; i < n; i++) + json_variant_unref(elements[i]); + + free(elements); + return r; +} + +int dns_resource_record_to_json(DnsResourceRecord *rr, JsonVariant **ret) { + _cleanup_(json_variant_unrefp) JsonVariant *k = NULL; + int r; + + assert(rr); + assert(ret); + + r = dns_resource_key_to_json(rr->key, &k); + if (r < 0) + return r; + + switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) { + + case DNS_TYPE_SRV: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("priority", JSON_BUILD_UNSIGNED(rr->srv.priority)), + JSON_BUILD_PAIR("weight", JSON_BUILD_UNSIGNED(rr->srv.weight)), + JSON_BUILD_PAIR("port", JSON_BUILD_UNSIGNED(rr->srv.port)), + JSON_BUILD_PAIR("name", JSON_BUILD_STRING(rr->srv.name)))); + + case DNS_TYPE_PTR: + case DNS_TYPE_NS: + case DNS_TYPE_CNAME: + case DNS_TYPE_DNAME: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("name", JSON_BUILD_STRING(rr->ptr.name)))); + + case DNS_TYPE_HINFO: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("cpu", JSON_BUILD_STRING(rr->hinfo.cpu)), + JSON_BUILD_PAIR("os", JSON_BUILD_STRING(rr->hinfo.os)))); + + case DNS_TYPE_SPF: + case DNS_TYPE_TXT: { + _cleanup_(json_variant_unrefp) JsonVariant *l = NULL; + + r = txt_to_json(rr->txt.items, &l); + if (r < 0) + return r; + + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("items", JSON_BUILD_VARIANT(l)))); + } + + case DNS_TYPE_A: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("address", JSON_BUILD_IN4_ADDR(&rr->a.in_addr)))); + + case DNS_TYPE_AAAA: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("address", JSON_BUILD_IN6_ADDR(&rr->aaaa.in6_addr)))); + + case DNS_TYPE_SOA: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("mname", JSON_BUILD_STRING(rr->soa.mname)), + JSON_BUILD_PAIR("rname", JSON_BUILD_STRING(rr->soa.rname)), + JSON_BUILD_PAIR("serial", JSON_BUILD_UNSIGNED(rr->soa.serial)), + JSON_BUILD_PAIR("refresh", JSON_BUILD_UNSIGNED(rr->soa.refresh)), + JSON_BUILD_PAIR("expire", JSON_BUILD_UNSIGNED(rr->soa.retry)), + JSON_BUILD_PAIR("minimum", JSON_BUILD_UNSIGNED(rr->soa.minimum)))); + + case DNS_TYPE_MX: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("priority", JSON_BUILD_UNSIGNED(rr->mx.priority)), + JSON_BUILD_PAIR("exchange", JSON_BUILD_STRING(rr->mx.exchange)))); + case DNS_TYPE_LOC: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("version", JSON_BUILD_UNSIGNED(rr->loc.version)), + JSON_BUILD_PAIR("size", JSON_BUILD_UNSIGNED(rr->loc.size)), + JSON_BUILD_PAIR("horiz_pre", JSON_BUILD_UNSIGNED(rr->loc.horiz_pre)), + JSON_BUILD_PAIR("vert_pre", JSON_BUILD_UNSIGNED(rr->loc.vert_pre)), + JSON_BUILD_PAIR("latitude", JSON_BUILD_UNSIGNED(rr->loc.latitude)), + JSON_BUILD_PAIR("longitude", JSON_BUILD_UNSIGNED(rr->loc.longitude)), + JSON_BUILD_PAIR("altitude", JSON_BUILD_UNSIGNED(rr->loc.altitude)))); + + case DNS_TYPE_DS: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("keyTag", JSON_BUILD_UNSIGNED(rr->ds.key_tag)), + JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->ds.algorithm)), + JSON_BUILD_PAIR("digestType", JSON_BUILD_UNSIGNED(rr->ds.digest_type)), + JSON_BUILD_PAIR("digest", JSON_BUILD_HEX(rr->ds.digest, rr->ds.digest_size)))); + + case DNS_TYPE_SSHFP: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->sshfp.algorithm)), + JSON_BUILD_PAIR("fptype", JSON_BUILD_UNSIGNED(rr->sshfp.fptype)), + JSON_BUILD_PAIR("fingerprint", JSON_BUILD_HEX(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size)))); + + case DNS_TYPE_DNSKEY: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(rr->dnskey.flags)), + JSON_BUILD_PAIR("protocol", JSON_BUILD_UNSIGNED(rr->dnskey.protocol)), + JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->dnskey.algorithm)), + JSON_BUILD_PAIR("dnskey", JSON_BUILD_BASE64(rr->dnskey.key, rr->dnskey.key_size)))); + + + case DNS_TYPE_RRSIG: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("signer", JSON_BUILD_STRING(rr->rrsig.signer)), + JSON_BUILD_PAIR("typeCovered", JSON_BUILD_UNSIGNED(rr->rrsig.type_covered)), + JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->rrsig.algorithm)), + JSON_BUILD_PAIR("labels", JSON_BUILD_UNSIGNED(rr->rrsig.labels)), + JSON_BUILD_PAIR("originalTtl", JSON_BUILD_UNSIGNED(rr->rrsig.original_ttl)), + JSON_BUILD_PAIR("expiration", JSON_BUILD_UNSIGNED(rr->rrsig.expiration)), + JSON_BUILD_PAIR("inception", JSON_BUILD_UNSIGNED(rr->rrsig.inception)), + JSON_BUILD_PAIR("keyTag", JSON_BUILD_UNSIGNED(rr->rrsig.key_tag)), + JSON_BUILD_PAIR("signature", JSON_BUILD_BASE64(rr->rrsig.signature, rr->rrsig.signature_size)))); + + case DNS_TYPE_NSEC: { + _cleanup_(json_variant_unrefp) JsonVariant *bm = NULL; + + r = type_bitmap_to_json(rr->nsec.types, &bm); + if (r < 0) + return r; + + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("nextDomain", JSON_BUILD_STRING(rr->nsec.next_domain_name)), + JSON_BUILD_PAIR("types", JSON_BUILD_VARIANT(bm)))); + } + + case DNS_TYPE_NSEC3: { + _cleanup_(json_variant_unrefp) JsonVariant *bm = NULL; + + r = type_bitmap_to_json(rr->nsec3.types, &bm); + if (r < 0) + return r; + + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->nsec3.algorithm)), + JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(rr->nsec3.flags)), + JSON_BUILD_PAIR("iterations", JSON_BUILD_UNSIGNED(rr->nsec3.iterations)), + JSON_BUILD_PAIR("salt", JSON_BUILD_HEX(rr->nsec3.salt, rr->nsec3.salt_size)), + JSON_BUILD_PAIR("hash", JSON_BUILD_BASE32HEX(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size)), + JSON_BUILD_PAIR("types", JSON_BUILD_VARIANT(bm)))); + } + + case DNS_TYPE_TLSA: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("certUsage", JSON_BUILD_UNSIGNED(rr->tlsa.cert_usage)), + JSON_BUILD_PAIR("selector", JSON_BUILD_UNSIGNED(rr->tlsa.selector)), + JSON_BUILD_PAIR("matchingType", JSON_BUILD_UNSIGNED(rr->tlsa.matching_type)), + JSON_BUILD_PAIR("data", JSON_BUILD_HEX(rr->tlsa.data, rr->tlsa.data_size)))); + + case DNS_TYPE_CAA: + return json_build(ret, + JSON_BUILD_OBJECT( + JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)), + JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(rr->caa.flags)), + JSON_BUILD_PAIR("tag", JSON_BUILD_STRING(rr->caa.tag)), + JSON_BUILD_PAIR("value", JSON_BUILD_OCTESCAPE(rr->caa.value, rr->caa.value_size)))); + + default: + /* Can't provide broken-down format */ + *ret = NULL; + return 0; + } +} + +static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = { + /* Mnemonics as listed on https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */ + [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5", + [DNSSEC_ALGORITHM_DH] = "DH", + [DNSSEC_ALGORITHM_DSA] = "DSA", + [DNSSEC_ALGORITHM_ECC] = "ECC", + [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1", + [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1", + [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1", + [DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256", + [DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512", + [DNSSEC_ALGORITHM_ECC_GOST] = "ECC-GOST", + [DNSSEC_ALGORITHM_ECDSAP256SHA256] = "ECDSAP256SHA256", + [DNSSEC_ALGORITHM_ECDSAP384SHA384] = "ECDSAP384SHA384", + [DNSSEC_ALGORITHM_ED25519] = "ED25519", + [DNSSEC_ALGORITHM_ED448] = "ED448", + [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT", + [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS", + [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID", +}; +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_algorithm, int, 255); + +static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = { + /* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */ + [DNSSEC_DIGEST_SHA1] = "SHA-1", + [DNSSEC_DIGEST_SHA256] = "SHA-256", + [DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94", + [DNSSEC_DIGEST_SHA384] = "SHA-384", +}; +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_digest, int, 255); |