From 42cc2eebb01056beb7acd3ecfe8e533558237f84 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 31 Jul 2014 18:41:41 +0200
Subject: [PATCH] resolved: properly process SSHFP RRs

---
 src/resolve/resolved-dns-packet.c | 32 +++++++++++++++++++++++++++++++
 src/resolve/resolved-dns-rr.c     | 28 ++++++++++++++++++++++++++-
 src/resolve/resolved-dns-rr.h     |  8 +++++++-
 3 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 024ab0d0e..3eda80314 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -617,6 +617,16 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
                 break;
 
         case DNS_TYPE_SSHFP:
+                r = dns_packet_append_uint8(p, rr->sshfp.algorithm, NULL);
+                if (r < 0)
+                        goto fail;
+                r = dns_packet_append_uint8(p, rr->sshfp.fptype, NULL);
+                if (r < 0)
+                        goto fail;
+
+                r = dns_packet_append_blob(p, rr->sshfp.key, rr->sshfp.key_size, NULL);
+                break;
+
         case _DNS_TYPE_INVALID: /* unparseable */
         default:
 
@@ -1100,6 +1110,28 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
         }
 
         case DNS_TYPE_SSHFP:
+
+                r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL);
+                if (r < 0)
+                        goto fail;
+
+                r = dns_packet_read_uint8(p, &rr->sshfp.fptype, NULL);
+                if (r < 0)
+                        goto fail;
+
+                r = dns_packet_read(p, rdlength - 2, &d, NULL);
+                if (r < 0)
+                        goto fail;
+
+                rr->sshfp.key = memdup(d, rdlength - 2);
+                if (!rr->sshfp.key) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+
+                rr->sshfp.key_size = rdlength - 2;
+                break;
+
         default:
                 r = dns_packet_read(p, rdlength, &d, NULL);
                 if (r < 0)
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 9ef3135c2..04004de5e 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -265,6 +265,10 @@ DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
                         free(rr->mx.exchange);
                         break;
 
+                case DNS_TYPE_SSHFP:
+                        free(rr->sshfp.key);
+                        break;
+
                 case DNS_TYPE_LOC:
                 case DNS_TYPE_A:
                 case DNS_TYPE_AAAA:
@@ -393,6 +397,12 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
                        a->loc.longitude == b->loc.longitude &&
                        a->loc.altitude == b->loc.altitude;
 
+        case DNS_TYPE_SSHFP:
+                return a->sshfp.algorithm == b->sshfp.algorithm &&
+                       a->sshfp.fptype == b->sshfp.fptype &&
+                       a->sshfp.key_size == b->sshfp.key_size &&
+                       memcmp(a->sshfp.key, b->sshfp.key, a->sshfp.key_size) == 0;
+
         default:
                 return a->generic.size == b->generic.size &&
                         memcmp(a->generic.data, b->generic.data, a->generic.size) == 0;
@@ -430,7 +440,6 @@ static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t alt
         return s;
 }
 
-
 int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
         _cleanup_free_ char *k = NULL;
         char *s;
@@ -555,6 +564,23 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
                 break;
         }
 
+        case DNS_TYPE_SSHFP: {
+                _cleanup_free_ char *x = NULL;
+
+                x = hexmem(rr->sshfp.key, rr->sshfp.key_size);
+                if (!x)
+                        return -ENOMEM;
+
+                r = asprintf(&s, "%s %u %u %s",
+                             k,
+                             rr->sshfp.algorithm,
+                             rr->sshfp.fptype,
+                             x);
+                if (r < 0)
+                        return -ENOMEM;
+                break;
+        }
+
         default: {
                 _cleanup_free_ char *x = NULL;
 
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index a001433ff..61c00d59b 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -55,7 +55,6 @@ enum {
         DNS_TYPE_SRV   = 0x21,
         DNS_TYPE_DNAME = 0x27,
         DNS_TYPE_SSHFP = 0x2C,
-
         DNS_TYPE_SPF   = 0x63,
 
         /* Special records */
@@ -138,6 +137,13 @@ struct DnsResourceRecord {
                         uint32_t longitude;
                         uint32_t altitude;
                 } loc;
+
+                struct {
+                        uint8_t algorithm;
+                        uint8_t fptype;
+                        void *key;
+                        size_t key_size;
+                } sshfp;
         };
 };
 
-- 
2.30.2