umdnsd: Replace strerror(errno) with %m.

[project/mdnsd.git] / dns.c

diff --git a/dns.c b/dns.c
index 51a0150..aadfdd8 100644 (file)
--- a/dns.c
+++ b/dns.c
@@ -68,7 +68,8 @@ dns_type_string(uint16_t type)
 }
 
 void
-dns_send_question(struct interface *iface, const char *question, int type, int multicast)
+dns_send_question(struct interface *iface, struct sockaddr *to,
+                 const char *question, int type, int multicast)
 {
        static struct dns_header h;
        static struct dns_question q;
@@ -98,7 +99,7 @@ dns_send_question(struct interface *iface, const char *question, int type, int m
        iov[1].iov_len = len;
 
        DBG(1, "Q <- %s %s\n", dns_type_string(type), question);
-       if (interface_send_packet(iface, NULL, iov, ARRAY_SIZE(iov)) < 0)
+       if (interface_send_packet(iface, to, iov, ARRAY_SIZE(iov)) < 0)
                perror("failed to send question");
 }
 
@@ -312,8 +313,9 @@ dns_consume_name(const uint8_t *base, int blen, uint8_t **data, int *len)
        return name_buffer;
 }
 
-static int
-parse_answer(struct interface *iface, uint8_t *buffer, int len, uint8_t **b, int *rlen, int cache)
+static int parse_answer(struct interface *iface, struct sockaddr *from,
+                       uint8_t *buffer, int len, uint8_t **b, int *rlen,
+                       int cache)
 {
        char *name = dns_consume_name(buffer, len, b, rlen);
        struct dns_answer *a;
@@ -343,7 +345,7 @@ parse_answer(struct interface *iface, uint8_t *buffer, int len, uint8_t **b, int
        *b += a->rdlength;
 
        if (cache)
-               cache_answer(iface, buffer, len, name, a, rdata, a->class & CLASS_FLUSH);
+               cache_answer(iface, from, buffer, len, name, a, rdata, a->class & CLASS_FLUSH);
 
        return 0;
 }
@@ -367,7 +369,7 @@ parse_question(struct interface *iface, struct sockaddr *from, char *name, struc
        case TYPE_ANY:
                if (!strcmp(name, mdns_hostname_local)) {
                        dns_reply_a(iface, to, announce_ttl);
-                       service_reply(iface, to, NULL, announce_ttl);
+                       service_reply(iface, to, NULL, NULL, announce_ttl);
                }
                break;
 
@@ -376,15 +378,18 @@ parse_question(struct interface *iface, struct sockaddr *from, char *name, struc
                        dns_reply_a(iface, to, announce_ttl);
                        service_announce_services(iface, to, announce_ttl);
                } else {
-                       /* First dot separates instance name from the rest */
-                       char *dot = strchr(name, '.');
-                       /* Length of queried instance */
-                       size_t len = dot ? dot - name : 0;
-
-                       /* Make sure it's query for the instance name we use */
-                       if (len && len == strlen(mdns_hostname) &&
-                           !strncmp(name, mdns_hostname, len))
-                               service_reply(iface, to, dot + 1, announce_ttl);
+                       if (name[0] == '_') {
+                               service_reply(iface, to, NULL, name, announce_ttl);
+                       } else {
+                               /* First dot separates instance name from the rest */
+                               char *dot = strchr(name, '.');
+
+                               if (dot) {
+                                       *dot = '\0';
+                                       service_reply(iface, to, name, dot + 1, announce_ttl);
+                                       *dot = '.';
+                               }
+                       }
                }
                break;
 
@@ -393,14 +398,14 @@ parse_question(struct interface *iface, struct sockaddr *from, char *name, struc
                host = strstr(name, ".local");
                if (host)
                        *host = '\0';
-               if (!strcmp(mdns_hostname, name))
+               if (!strcmp(umdns_host_label, name))
                        dns_reply_a(iface, to, announce_ttl);
                break;
        };
 }
 
 void
-dns_handle_packet(struct interface *iface, struct sockaddr *s, uint16_t port, uint8_t *buffer, int len)
+dns_handle_packet(struct interface *iface, struct sockaddr *from, uint16_t port, uint8_t *buffer, int len)
 {
        struct dns_header *h;
        uint8_t *b = buffer;
@@ -432,22 +437,22 @@ dns_handle_packet(struct interface *iface, struct sockaddr *s, uint16_t port, ui
                }
 
                if (!(h->flags & FLAG_RESPONSE))
-                       parse_question(iface, s, name, q);
+                       parse_question(iface, from, name, q);
        }
 
        if (!(h->flags & FLAG_RESPONSE))
                return;
 
        while (h->answers-- > 0)
-               if (parse_answer(iface, buffer, len, &b, &rlen, 1))
+               if (parse_answer(iface, from, buffer, len, &b, &rlen, 1))
                        return;
 
        while (h->authority-- > 0)
-               if (parse_answer(iface, buffer, len, &b, &rlen, 1))
+               if (parse_answer(iface, from, buffer, len, &b, &rlen, 1))
                        return;
 
        while (h->additional-- > 0)
-               if (parse_answer(iface, buffer, len, &b, &rlen, 1))
+               if (parse_answer(iface, from, buffer, len, &b, &rlen, 1))
                        return;
 
 }