/
rdata.c
1169 lines (1046 loc) · 27.9 KB
/
rdata.c
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/*
* rdata.c -- RDATA conversion functions.
*
* Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
*/
#include "config.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include "rdata.h"
#include "zonec.h"
/* Taken from RFC 4398, section 2.1. */
lookup_table_type dns_certificate_types[] = {
/* 0 Reserved */
{ 1, "PKIX" }, /* X.509 as per PKIX */
{ 2, "SPKI" }, /* SPKI cert */
{ 3, "PGP" }, /* OpenPGP packet */
{ 4, "IPKIX" }, /* The URL of an X.509 data object */
{ 5, "ISPKI" }, /* The URL of an SPKI certificate */
{ 6, "IPGP" }, /* The fingerprint and URL of an OpenPGP packet */
{ 7, "ACPKIX" }, /* Attribute Certificate */
{ 8, "IACPKIX" }, /* The URL of an Attribute Certificate */
{ 253, "URI" }, /* URI private */
{ 254, "OID" }, /* OID private */
/* 255 Reserved */
/* 256-65279 Available for IANA assignment */
/* 65280-65534 Experimental */
/* 65535 Reserved */
{ 0, NULL }
};
/* Taken from RFC 2535, section 7. */
lookup_table_type dns_algorithms[] = {
{ 1, "RSAMD5" }, /* RFC 2537 */
{ 2, "DH" }, /* RFC 2539 */
{ 3, "DSA" }, /* RFC 2536 */
{ 4, "ECC" },
{ 5, "RSASHA1" }, /* RFC 3110 */
{ 6, "DSA-NSEC3-SHA1" }, /* RFC 5155 */
{ 7, "RSASHA1-NSEC3-SHA1" }, /* RFC 5155 */
{ 8, "RSASHA256" }, /* RFC 5702 */
{ 10, "RSASHA512" }, /* RFC 5702 */
{ 12, "ECC-GOST" }, /* RFC 5933 */
{ 13, "ECDSAP256SHA256" }, /* RFC 6605 */
{ 14, "ECDSAP384SHA384" }, /* RFC 6605 */
{ 15, "ED25519" }, /* RFC 8080 */
{ 16, "ED448" }, /* RFC 8080 */
{ 252, "INDIRECT" },
{ 253, "PRIVATEDNS" },
{ 254, "PRIVATEOID" },
{ 0, NULL }
};
const char *svcparamkey_strs[] = {
"mandatory", "alpn", "no-default-alpn", "port",
"ipv4hint", "ech", "ipv6hint", "dohpath"
};
typedef int (*rdata_to_string_type)(buffer_type *output,
rdata_atom_type rdata,
rr_type *rr);
static int
rdata_dname_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
buffer_printf(output,
"%s",
dname_to_string(domain_dname(rdata_atom_domain(rdata)),
NULL));
return 1;
}
static int
rdata_dns_name_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
const uint8_t *data = rdata_atom_data(rdata);
size_t offset = 0;
uint8_t length = data[offset];
size_t i;
while (length > 0)
{
if (offset) /* concat label */
buffer_printf(output, ".");
for (i = 1; i <= length; ++i) {
uint8_t ch = data[i+offset];
if (ch=='.' || ch==';' || ch=='(' || ch==')' || ch=='\\') {
buffer_printf(output, "\\%c", (char) ch);
} else if (!isgraph((unsigned char) ch)) {
buffer_printf(output, "\\%03u", (unsigned int) ch);
} else if (isprint((unsigned char) ch)) {
buffer_printf(output, "%c", (char) ch);
} else {
buffer_printf(output, "\\%03u", (unsigned int) ch);
}
}
/* next label */
offset = offset+length+1;
length = data[offset];
}
/* root label */
buffer_printf(output, ".");
return 1;
}
static int
rdata_text_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
const uint8_t *data = rdata_atom_data(rdata);
uint8_t length = data[0];
size_t i;
buffer_printf(output, "\"");
for (i = 1; i <= length; ++i) {
char ch = (char) data[i];
if (isprint((unsigned char)ch)) {
if (ch == '"' || ch == '\\') {
buffer_printf(output, "\\");
}
buffer_printf(output, "%c", ch);
} else {
buffer_printf(output, "\\%03u", (unsigned) data[i]);
}
}
buffer_printf(output, "\"");
return 1;
}
static int
rdata_texts_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint16_t pos = 0;
const uint8_t *data = rdata_atom_data(rdata);
uint16_t length = rdata_atom_size(rdata);
size_t i;
while (pos < length && pos + data[pos] < length) {
buffer_printf(output, "\"");
for (i = 1; i <= data[pos]; ++i) {
char ch = (char) data[pos + i];
if (isprint((unsigned char)ch)) {
if (ch == '"' || ch == '\\') {
buffer_printf(output, "\\");
}
buffer_printf(output, "%c", ch);
} else {
buffer_printf(output, "\\%03u", (unsigned) data[pos+i]);
}
}
pos += data[pos]+1;
buffer_printf(output, pos < length?"\" ":"\"");
}
return 1;
}
static int
rdata_long_text_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
const uint8_t *data = rdata_atom_data(rdata);
uint16_t length = rdata_atom_size(rdata);
size_t i;
buffer_printf(output, "\"");
for (i = 0; i < length; ++i) {
char ch = (char) data[i];
if (isprint((unsigned char)ch)) {
if (ch == '"' || ch == '\\') {
buffer_printf(output, "\\");
}
buffer_printf(output, "%c", ch);
} else {
buffer_printf(output, "\\%03u", (unsigned) data[i]);
}
}
buffer_printf(output, "\"");
return 1;
}
static int
rdata_tag_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
const uint8_t *data = rdata_atom_data(rdata);
uint8_t length = data[0];
size_t i;
for (i = 1; i <= length; ++i) {
char ch = (char) data[i];
if (isdigit((unsigned char)ch) || islower((unsigned char)ch))
buffer_printf(output, "%c", ch);
else return 0;
}
return 1;
}
static int
rdata_byte_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint8_t data = *rdata_atom_data(rdata);
buffer_printf(output, "%lu", (unsigned long) data);
return 1;
}
static int
rdata_short_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint16_t data = read_uint16(rdata_atom_data(rdata));
buffer_printf(output, "%lu", (unsigned long) data);
return 1;
}
static int
rdata_long_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint32_t data = read_uint32(rdata_atom_data(rdata));
buffer_printf(output, "%lu", (unsigned long) data);
return 1;
}
static int
rdata_a_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
int result = 0;
char str[200];
if (inet_ntop(AF_INET, rdata_atom_data(rdata), str, sizeof(str))) {
buffer_printf(output, "%s", str);
result = 1;
}
return result;
}
static int
rdata_aaaa_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
int result = 0;
char str[200];
if (inet_ntop(AF_INET6, rdata_atom_data(rdata), str, sizeof(str))) {
buffer_printf(output, "%s", str);
result = 1;
}
return result;
}
static int
rdata_ilnp64_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint8_t* data = rdata_atom_data(rdata);
uint16_t a1 = read_uint16(data);
uint16_t a2 = read_uint16(data+2);
uint16_t a3 = read_uint16(data+4);
uint16_t a4 = read_uint16(data+6);
buffer_printf(output, "%.4x:%.4x:%.4x:%.4x", a1, a2, a3, a4);
return 1;
}
static int
rdata_eui48_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint8_t* data = rdata_atom_data(rdata);
uint8_t a1 = data[0];
uint8_t a2 = data[1];
uint8_t a3 = data[2];
uint8_t a4 = data[3];
uint8_t a5 = data[4];
uint8_t a6 = data[5];
buffer_printf(output, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
a1, a2, a3, a4, a5, a6);
return 1;
}
static int
rdata_eui64_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint8_t* data = rdata_atom_data(rdata);
uint8_t a1 = data[0];
uint8_t a2 = data[1];
uint8_t a3 = data[2];
uint8_t a4 = data[3];
uint8_t a5 = data[4];
uint8_t a6 = data[5];
uint8_t a7 = data[6];
uint8_t a8 = data[7];
buffer_printf(output, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x-%.2x",
a1, a2, a3, a4, a5, a6, a7, a8);
return 1;
}
static int
rdata_rrtype_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint16_t type = read_uint16(rdata_atom_data(rdata));
buffer_printf(output, "%s", rrtype_to_string(type));
return 1;
}
static int
rdata_algorithm_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint8_t id = *rdata_atom_data(rdata);
buffer_printf(output, "%u", (unsigned) id);
return 1;
}
static int
rdata_certificate_type_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint16_t id = read_uint16(rdata_atom_data(rdata));
lookup_table_type *type
= lookup_by_id(dns_certificate_types, id);
if (type) {
buffer_printf(output, "%s", type->name);
} else {
buffer_printf(output, "%u", (unsigned) id);
}
return 1;
}
static int
rdata_period_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint32_t period = read_uint32(rdata_atom_data(rdata));
buffer_printf(output, "%lu", (unsigned long) period);
return 1;
}
static int
rdata_time_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
int result = 0;
time_t time = (time_t) read_uint32(rdata_atom_data(rdata));
struct tm *tm = gmtime(&time);
char buf[15];
if (strftime(buf, sizeof(buf), "%Y%m%d%H%M%S", tm)) {
buffer_printf(output, "%s", buf);
result = 1;
}
return result;
}
static int
rdata_base32_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
int length;
size_t size = rdata_atom_size(rdata);
if(size == 0) {
buffer_write(output, "-", 1);
return 1;
}
size -= 1; /* remove length byte from count */
buffer_reserve(output, size * 2 + 1);
length = b32_ntop(rdata_atom_data(rdata)+1, size,
(char *) buffer_current(output), size * 2);
if (length > 0) {
buffer_skip(output, length);
}
return length != -1;
}
static int
rdata_base64_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
int length;
size_t size = rdata_atom_size(rdata);
if(size == 0) {
/* single zero represents empty buffer */
buffer_write(output, "0", 1);
return 1;
}
buffer_reserve(output, size * 2 + 1);
length = b64_ntop(rdata_atom_data(rdata), size,
(char *) buffer_current(output), size * 2);
if (length > 0) {
buffer_skip(output, length);
}
return length != -1;
}
static void
hex_to_string(buffer_type *output, const uint8_t *data, size_t size)
{
static const char hexdigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
size_t i;
buffer_reserve(output, size * 2);
for (i = 0; i < size; ++i) {
uint8_t octet = *data++;
buffer_write_u8(output, hexdigits[octet >> 4]);
buffer_write_u8(output, hexdigits[octet & 0x0f]);
}
}
static int
rdata_hex_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
if(rdata_atom_size(rdata) == 0) {
/* single zero represents empty buffer, such as CDS deletes */
buffer_printf(output, "0");
} else {
hex_to_string(output, rdata_atom_data(rdata), rdata_atom_size(rdata));
}
return 1;
}
static int
rdata_hexlen_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
if(rdata_atom_size(rdata) <= 1) {
/* NSEC3 salt hex can be empty */
buffer_printf(output, "-");
return 1;
}
hex_to_string(output, rdata_atom_data(rdata)+1, rdata_atom_size(rdata)-1);
return 1;
}
static int
rdata_nsap_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
buffer_printf(output, "0x");
hex_to_string(output, rdata_atom_data(rdata), rdata_atom_size(rdata));
return 1;
}
static int
rdata_apl_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
int result = 0;
buffer_type packet;
buffer_create_from(
&packet, rdata_atom_data(rdata), rdata_atom_size(rdata));
if (buffer_available(&packet, 4)) {
uint16_t address_family = buffer_read_u16(&packet);
uint8_t prefix = buffer_read_u8(&packet);
uint8_t length = buffer_read_u8(&packet);
int negated = length & APL_NEGATION_MASK;
int af = -1;
length &= APL_LENGTH_MASK;
switch (address_family) {
case 1: af = AF_INET; break;
case 2: af = AF_INET6; break;
}
if (af != -1 && buffer_available(&packet, length)) {
char text_address[1000];
uint8_t address[128];
memset(address, 0, sizeof(address));
buffer_read(&packet, address, length);
if (inet_ntop(af, address, text_address, sizeof(text_address))) {
buffer_printf(output, "%s%d:%s/%d",
negated ? "!" : "",
(int) address_family,
text_address,
(int) prefix);
result = 1;
}
}
}
return result;
}
static int
rdata_services_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
int result = 0;
buffer_type packet;
buffer_create_from(
&packet, rdata_atom_data(rdata), rdata_atom_size(rdata));
if (buffer_available(&packet, 1)) {
uint8_t protocol_number = buffer_read_u8(&packet);
ssize_t bitmap_size = buffer_remaining(&packet);
uint8_t *bitmap = buffer_current(&packet);
struct protoent *proto = getprotobynumber(protocol_number);
if (proto) {
int i;
buffer_printf(output, "%s", proto->p_name);
for (i = 0; i < bitmap_size * 8; ++i) {
if (get_bit(bitmap, i)) {
struct servent *service = getservbyport((int)htons(i), proto->p_name);
if (service) {
buffer_printf(output, " %s", service->s_name);
} else {
buffer_printf(output, " %d", i);
}
}
}
buffer_skip(&packet, bitmap_size);
result = 1;
}
}
return result;
}
static int
rdata_ipsecgateway_to_string(buffer_type *output, rdata_atom_type rdata, rr_type* rr)
{
int gateway_type = rdata_atom_data(rr->rdatas[1])[0];
switch(gateway_type) {
case IPSECKEY_NOGATEWAY:
buffer_printf(output, ".");
break;
case IPSECKEY_IP4:
rdata_a_to_string(output, rdata, rr);
break;
case IPSECKEY_IP6:
rdata_aaaa_to_string(output, rdata, rr);
break;
case IPSECKEY_DNAME:
{
region_type* temp = region_create(xalloc, free);
const dname_type* d = dname_make(temp,
rdata_atom_data(rdata), 0);
if(!d) {
region_destroy(temp);
return 0;
}
buffer_printf(output, "%s", dname_to_string(d, NULL));
region_destroy(temp);
}
break;
default:
return 0;
}
return 1;
}
static int
rdata_nxt_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
size_t i;
uint8_t *bitmap = rdata_atom_data(rdata);
size_t bitmap_size = rdata_atom_size(rdata);
for (i = 0; i < bitmap_size * 8; ++i) {
if (get_bit(bitmap, i)) {
buffer_printf(output, "%s ", rrtype_to_string(i));
}
}
buffer_skip(output, -1);
return 1;
}
static int
rdata_nsec_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
size_t saved_position = buffer_position(output);
buffer_type packet;
int insert_space = 0;
buffer_create_from(
&packet, rdata_atom_data(rdata), rdata_atom_size(rdata));
while (buffer_available(&packet, 2)) {
uint8_t window = buffer_read_u8(&packet);
uint8_t bitmap_size = buffer_read_u8(&packet);
uint8_t *bitmap = buffer_current(&packet);
int i;
if (!buffer_available(&packet, bitmap_size)) {
buffer_set_position(output, saved_position);
return 0;
}
for (i = 0; i < bitmap_size * 8; ++i) {
if (get_bit(bitmap, i)) {
buffer_printf(output,
"%s%s",
insert_space ? " " : "",
rrtype_to_string(
window * 256 + i));
insert_space = 1;
}
}
buffer_skip(&packet, bitmap_size);
}
return 1;
}
static int
rdata_loc_to_string(buffer_type *ATTR_UNUSED(output),
rdata_atom_type ATTR_UNUSED(rdata),
rr_type* ATTR_UNUSED(rr))
{
/*
* Returning 0 forces the record to be printed in unknown
* format.
*/
return 0;
}
static void
buffer_print_svcparamkey(buffer_type *output, uint16_t svcparamkey)
{
if (svcparamkey < SVCPARAMKEY_COUNT)
buffer_printf(output, "%s", svcparamkey_strs[svcparamkey]);
else
buffer_printf(output, "key%d", (int)svcparamkey);
}
static int
rdata_svcparam_port_to_string(buffer_type *output, uint16_t val_len,
uint16_t *data)
{
if (val_len != 2)
return 0; /* wireformat error, a short is 2 bytes */
buffer_printf(output, "=%d", (int)ntohs(data[0]));
return 1;
}
static int
rdata_svcparam_ipv4hint_to_string(buffer_type *output, uint16_t val_len,
uint16_t *data)
{
char ip_str[INET_ADDRSTRLEN + 1];
assert(val_len > 0); /* Guaranteed by rdata_svcparam_to_string */
if ((val_len % IP4ADDRLEN) == 0) {
if (inet_ntop(AF_INET, data, ip_str, sizeof(ip_str)) == NULL)
return 0; /* wireformat error, incorrect size or inet family */
buffer_printf(output, "=%s", ip_str);
data += IP4ADDRLEN / sizeof(uint16_t);
while ((val_len -= IP4ADDRLEN) > 0) {
if (inet_ntop(AF_INET, data, ip_str, sizeof(ip_str)) == NULL)
return 0; /* wireformat error, incorrect size or inet family */
buffer_printf(output, ",%s", ip_str);
data += IP4ADDRLEN / sizeof(uint16_t);
}
return 1;
} else
return 0;
}
static int
rdata_svcparam_ipv6hint_to_string(buffer_type *output, uint16_t val_len,
uint16_t *data)
{
char ip_str[INET6_ADDRSTRLEN + 1];
assert(val_len > 0); /* Guaranteed by rdata_svcparam_to_string */
if ((val_len % IP6ADDRLEN) == 0) {
if (inet_ntop(AF_INET6, data, ip_str, sizeof(ip_str)) == NULL)
return 0; /* wireformat error, incorrect size or inet family */
buffer_printf(output, "=%s", ip_str);
data += IP6ADDRLEN / sizeof(uint16_t);
while ((val_len -= IP6ADDRLEN) > 0) {
if (inet_ntop(AF_INET6, data, ip_str, sizeof(ip_str)) == NULL)
return 0; /* wireformat error, incorrect size or inet family */
buffer_printf(output, ",%s", ip_str);
data += IP6ADDRLEN / sizeof(uint16_t);
}
return 1;
} else
return 0;
}
static int
rdata_svcparam_mandatory_to_string(buffer_type *output, uint16_t val_len,
uint16_t *data)
{
assert(val_len > 0); /* Guaranteed by rdata_svcparam_to_string */
if (val_len % sizeof(uint16_t))
return 0; /* wireformat error, val_len must be multiple of shorts */
buffer_write_u8(output, '=');
buffer_print_svcparamkey(output, ntohs(*data));
data += 1;
while ((val_len -= sizeof(uint16_t))) {
buffer_write_u8(output, ',');
buffer_print_svcparamkey(output, ntohs(*data));
data += 1;
}
return 1;
}
static int
rdata_svcparam_ech_to_string(buffer_type *output, uint16_t val_len,
uint16_t *data)
{
int length;
assert(val_len > 0); /* Guaranteed by rdata_svcparam_to_string */
buffer_write_u8(output, '=');
buffer_reserve(output, val_len * 2 + 1);
length = b64_ntop((uint8_t*) data, val_len,
(char *) buffer_current(output), val_len * 2);
if (length > 0) {
buffer_skip(output, length);
}
return length != -1;
}
static int
rdata_svcparam_alpn_to_string(buffer_type *output, uint16_t val_len,
uint16_t *data)
{
uint8_t *dp = (void *)data;
assert(val_len > 0); /* Guaranteed by rdata_svcparam_to_string */
buffer_write_u8(output, '=');
buffer_write_u8(output, '"');
while (val_len) {
uint8_t i, str_len = *dp++;
if (str_len > --val_len)
return 0;
for (i = 0; i < str_len; i++) {
if (dp[i] == '"' || dp[i] == '\\')
buffer_printf(output, "\\\\\\%c", dp[i]);
else if (dp[i] == ',')
buffer_printf(output, "\\\\%c", dp[i]);
else if (!isprint(dp[i]))
buffer_printf(output, "\\%03u", (unsigned) dp[i]);
else
buffer_write_u8(output, dp[i]);
}
dp += str_len;
if ((val_len -= str_len))
buffer_write_u8(output, ',');
}
buffer_write_u8(output, '"');
return 1;
}
static int
rdata_svcparam_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint16_t size = rdata_atom_size(rdata);
uint16_t* data = (uint16_t *)rdata_atom_data(rdata);
uint16_t svcparamkey, val_len;
uint8_t* dp;
size_t i;
if (size < 4)
return 0;
svcparamkey = ntohs(data[0]);
buffer_print_svcparamkey(output, svcparamkey);
val_len = ntohs(data[1]);
if (size != val_len + 4)
return 0; /* wireformat error */
if (!val_len) {
/* Some SvcParams MUST have values */
switch (svcparamkey) {
case SVCB_KEY_ALPN:
case SVCB_KEY_PORT:
case SVCB_KEY_IPV4HINT:
case SVCB_KEY_IPV6HINT:
case SVCB_KEY_MANDATORY:
case SVCB_KEY_DOHPATH:
return 0;
default:
return 1;
}
}
switch (svcparamkey) {
case SVCB_KEY_PORT:
return rdata_svcparam_port_to_string(output, val_len, data+2);
case SVCB_KEY_IPV4HINT:
return rdata_svcparam_ipv4hint_to_string(output, val_len, data+2);
case SVCB_KEY_IPV6HINT:
return rdata_svcparam_ipv6hint_to_string(output, val_len, data+2);
case SVCB_KEY_MANDATORY:
return rdata_svcparam_mandatory_to_string(output, val_len, data+2);
case SVCB_KEY_NO_DEFAULT_ALPN:
return 0; /* wireformat error, should not have a value */
case SVCB_KEY_ALPN:
return rdata_svcparam_alpn_to_string(output, val_len, data+2);
case SVCB_KEY_ECH:
return rdata_svcparam_ech_to_string(output, val_len, data+2);
case SVCB_KEY_DOHPATH:
/* fallthrough */
default:
buffer_write(output, "=\"", 2);
dp = (void*) (data + 2);
for (i = 0; i < val_len; i++) {
if (dp[i] == '"' || dp[i] == '\\')
buffer_printf(output, "\\%c", dp[i]);
else if (!isprint(dp[i]))
buffer_printf(output, "\\%03u", (unsigned) dp[i]);
else
buffer_write_u8(output, dp[i]);
}
buffer_write_u8(output, '"');
break;
}
return 1;
}
static int
rdata_unknown_to_string(buffer_type *output, rdata_atom_type rdata,
rr_type* ATTR_UNUSED(rr))
{
uint16_t size = rdata_atom_size(rdata);
buffer_printf(output, "\\# %lu ", (unsigned long) size);
hex_to_string(output, rdata_atom_data(rdata), size);
return 1;
}
static rdata_to_string_type rdata_to_string_table[RDATA_ZF_UNKNOWN + 1] = {
rdata_dname_to_string,
rdata_dns_name_to_string,
rdata_text_to_string,
rdata_texts_to_string,
rdata_byte_to_string,
rdata_short_to_string,
rdata_long_to_string,
rdata_a_to_string,
rdata_aaaa_to_string,
rdata_rrtype_to_string,
rdata_algorithm_to_string,
rdata_certificate_type_to_string,
rdata_period_to_string,
rdata_time_to_string,
rdata_base64_to_string,
rdata_base32_to_string,
rdata_hex_to_string,
rdata_hexlen_to_string,
rdata_nsap_to_string,
rdata_apl_to_string,
rdata_ipsecgateway_to_string,
rdata_services_to_string,
rdata_nxt_to_string,
rdata_nsec_to_string,
rdata_loc_to_string,
rdata_ilnp64_to_string,
rdata_eui48_to_string,
rdata_eui64_to_string,
rdata_long_text_to_string,
rdata_tag_to_string,
rdata_svcparam_to_string,
rdata_unknown_to_string
};
int
rdata_atom_to_string(buffer_type *output, rdata_zoneformat_type type,
rdata_atom_type rdata, rr_type* record)
{
return rdata_to_string_table[type](output, rdata, record);
}
ssize_t
rdata_wireformat_to_rdata_atoms(region_type *region,
domain_table_type *owners,
uint16_t rrtype,
uint16_t data_size,
buffer_type *packet,
rdata_atom_type **rdatas)
{
size_t end = buffer_position(packet) + data_size;
size_t i;
rdata_atom_type temp_rdatas[MAXRDATALEN];
rrtype_descriptor_type *descriptor = rrtype_descriptor_by_type(rrtype);
region_type *temp_region;
assert(descriptor->maximum <= MAXRDATALEN);
if (!buffer_available(packet, data_size)) {
return -1;
}
temp_region = region_create(xalloc, free);
for (i = 0; i < descriptor->maximum; ++i) {
int is_domain = 0;
int is_normalized = 0;
int is_wirestore = 0;
size_t length = 0;
int required = i < descriptor->minimum;
switch (rdata_atom_wireformat_type(rrtype, i)) {
case RDATA_WF_COMPRESSED_DNAME:
case RDATA_WF_UNCOMPRESSED_DNAME:
is_domain = 1;
is_normalized = 1;
break;
case RDATA_WF_LITERAL_DNAME:
is_domain = 1;
is_wirestore = 1;
break;
case RDATA_WF_BYTE:
length = sizeof(uint8_t);
break;
case RDATA_WF_SHORT:
length = sizeof(uint16_t);
break;
case RDATA_WF_LONG:
length = sizeof(uint32_t);
break;
case RDATA_WF_TEXTS:
case RDATA_WF_LONG_TEXT:
length = end - buffer_position(packet);
break;
case RDATA_WF_TEXT:
case RDATA_WF_BINARYWITHLENGTH:
/* Length is stored in the first byte. */
length = 1;
if (buffer_position(packet) + length <= end) {
length += buffer_current(packet)[length - 1];
}
break;
case RDATA_WF_A:
length = sizeof(in_addr_t);
break;
case RDATA_WF_AAAA:
length = IP6ADDRLEN;
break;
case RDATA_WF_ILNP64:
length = IP6ADDRLEN/2;
break;
case RDATA_WF_EUI48:
length = EUI48ADDRLEN;
break;
case RDATA_WF_EUI64:
length = EUI64ADDRLEN;
break;
case RDATA_WF_BINARY:
/* Remaining RDATA is binary. */
length = end - buffer_position(packet);
break;