/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #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"); } bool dns_resource_key_is_dnssd_two_label_ptr(const DnsResourceKey *key) { assert(key); /* Check if this is a PTR resource key used in Service Instance * Enumeration as described in RFC6763 § 4.1, excluding selective * service names described in RFC6763 § 7.1. */ if (key->type != DNS_TYPE_PTR) return false; const char *name = dns_resource_key_name(key); if (dns_name_parent(&name) <= 0) return false; return dns_name_equal(name, "_tcp.local") || dns_name_equal(name, "_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);