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authorLennart Poettering <lennart@poettering.net>2015-12-02 20:47:11 +0100
committerLennart Poettering <lennart@poettering.net>2015-12-02 22:50:11 +0100
commit3cd03457bd3546a9d54a17bc00dae2058b43081b (patch)
treec3e544f712e2222a03dc80e68e2b503ef5fb66ec /src
parent92aea95e168f692803b30aaa72c9d1321632b6fd (diff)
util-lib: update dns_name_to_wire_format() to optionally generate DNSSEC canonical names
We'll need this later when putting together RR serializations to checksum.
Diffstat (limited to 'src')
-rw-r--r--src/libsystemd-network/sd-dhcp-client.c2
-rw-r--r--src/shared/dns-domain.c16
-rw-r--r--src/shared/dns-domain.h2
-rw-r--r--src/test/test-dns-domain.c2
4 files changed, 18 insertions, 4 deletions
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index a03c8460a8..4521f8f0b1 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -554,7 +554,7 @@ static int client_append_fqdn_option(DHCPMessage *message, size_t optlen, size_t
buffer[1] = 0; /* RCODE1 (deprecated) */
buffer[2] = 0; /* RCODE2 (deprecated) */
- r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3);
+ r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3, false);
if (r > 0)
r = dhcp_option_append(message, optlen, optoffset, 0,
DHCP_OPTION_FQDN, 3 + r, buffer);
diff --git a/src/shared/dns-domain.c b/src/shared/dns-domain.c
index 5ac8ad5b7a..429aa6d2cb 100644
--- a/src/shared/dns-domain.c
+++ b/src/shared/dns-domain.c
@@ -865,7 +865,7 @@ bool dns_name_is_single_label(const char *name) {
}
/* Encode a domain name according to RFC 1035 Section 3.1, without compression */
-int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) {
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical) {
uint8_t *label_length, *out;
int r;
@@ -890,6 +890,20 @@ int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) {
if (r < 0)
return r;
+ if (canonical) {
+ size_t i;
+
+ /* Optionally, output the name in DNSSEC
+ * canonical format, as described in RFC 4034,
+ * section 6.2. Or in other words: in
+ * lower-case. */
+
+ for (i = 0; i < (size_t) r; i++) {
+ if (out[i] >= 'A' && out[i] <= 'Z')
+ out[i] = out[i] - 'A' + 'a';
+ }
+ }
+
/* Fill label length, move forward */
*label_length = r;
out += r;
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index 44a9975541..17dab1da18 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -77,7 +77,7 @@ int dns_name_address(const char *p, int *family, union in_addr_union *a);
bool dns_name_is_root(const char *name);
bool dns_name_is_single_label(const char *name);
-int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len);
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical);
bool dns_srv_type_is_valid(const char *name);
bool dns_service_name_is_valid(const char *name);
diff --git a/src/test/test-dns-domain.c b/src/test/test-dns-domain.c
index 7f53a8cc56..de003e251c 100644
--- a/src/test/test-dns-domain.c
+++ b/src/test/test-dns-domain.c
@@ -56,7 +56,7 @@ static void test_dns_name_to_wire_format_one(const char *what, const char *expec
uint8_t buffer[buffer_sz];
int r;
- r = dns_name_to_wire_format(what, buffer, buffer_sz);
+ r = dns_name_to_wire_format(what, buffer, buffer_sz, false);
assert_se(r == ret);
if (r < 0)