Send a multicast response for QM query and other mDNS fixes
* Send a multicast response if it is a QM query * Use the NSEC record in the style which mDNS demands * Shuffle the code a bit and allow sending of A response... * Made the A record work * Now gets TTLs right and (I think) handles multiple questions
This commit is contained in:
Philip Gladstone
Marcel Stör
parent
8705b9e5a2
commit
f0c1034308
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@ -57,8 +57,12 @@
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#define MDNS_DBG(...) do {} while (0)
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#endif
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#define min(a,b) ((a) < (b) ? (a) : (b))
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#define MDNS_NAME_LENGTH 68 //68
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#define DNS_RRTYPE_NSEC 47
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static const char* service_name_with_suffix = NULL;
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#define DNS_SD_SERVICE "_services._dns-sd._udp.local"
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#define PUCK_SERVICE_LENGTH 30
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@ -176,12 +180,12 @@ PACK_STRUCT_END
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PACK_STRUCT_BEGIN
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/** MDNS answer message structure */
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struct mdns_auth {
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struct mdns_a_rr {
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PACK_STRUCT_FIELD(u32_t src);
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}PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#define SIZEOF_MDNS_AUTH 4
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#define SIZEOF_MDNS_A_RR 4
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PACK_STRUCT_BEGIN
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/** MDNS service registration message structure */
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struct mdns_service {
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@ -222,19 +226,31 @@ static u8_t *mdns_payload;
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* @return 0: names equal; 1: names differ
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*/
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static u8_t ICACHE_FLASH_ATTR
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mdns_compare_name(unsigned char *query, unsigned char *response) {
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mdns_compare_name(unsigned char *query, unsigned char *response, unsigned char *pktbase) {
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unsigned char n;
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do {
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n = *response++;
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/** @see RFC 1035 - 4.1.4. Message compression */
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if ((n & 0xc0) == 0xc0) {
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/* Compressed name */
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break;
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n = ((n << 8) + *response) & 0x3fff;
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if (n < response - pktbase) {
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response = pktbase + n;
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} else {
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return 1;
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}
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} else {
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/* Not compressed name */
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while (n > 0) {
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if ((*query) != (*response)) {
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char q = *query;
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if (q >= 'A' && q <= 'Z') {
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q = q + 'a' - 'A';
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}
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char r = *response;
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if (r >= 'A' && r <= 'Z') {
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r = r + 'a' - 'A';
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}
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if (q != r) {
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return 1;
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}
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++response;
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@ -272,6 +288,26 @@ mdns_namelen(u8_t *p, unsigned int maxlen) {
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return p - orig;
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}
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/* Copy an unencoded name into an encoded name */
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static unsigned char *copy_and_encode_name(unsigned char *ptr, const char *name) {
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while (*name) {
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const char *p = name;
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while (*p != '.' && *p) {
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p++;
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}
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*ptr++ = p - name;
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memcpy(ptr, name, p - name);
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ptr += p - name;
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if (!*p) {
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break;
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}
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name = p + 1;
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}
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*ptr++ = 0;
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return ptr;
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}
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static err_t send_packet(struct pbuf *p, struct ip_addr *dst_addr, u16_t dst_port, u8_t *addr_ptr) {
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err_t err;
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/* send dns packet */
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@ -325,13 +361,14 @@ mdns_send_service_type(u16_t id, struct ip_addr *dst_addr, u16_t dst_port) {
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err_t err;
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struct mdns_hdr *hdr;
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struct mdns_answer ans;
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struct mdns_auth auth;
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struct mdns_a_rr a_rr;
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struct mdns_service serv;
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struct pbuf *p ,*p_sta;
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char *query, *nptr;
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const char *pHostname;
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struct netif * sta_netif = NULL;
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struct netif * ap_netif = NULL;
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int max_ttl = dst_addr ? 10 : 7200;
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char tmpBuf[PUCK_DATASHEET_SIZE + PUCK_SERVICE_LENGTH];
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u8_t n;
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u16_t length = 0;
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@ -368,7 +405,7 @@ mdns_send_service_type(u16_t id, struct ip_addr *dst_addr, u16_t dst_port) {
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ans.type = htons(DNS_RRTYPE_PTR);
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ans.class = htons(DNS_RRCLASS_IN);
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ans.ttl = htonl(3600);
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ans.ttl = htonl(min(max_ttl, 3600));
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ans.len = htons(os_strlen(service_name_with_suffix) + 1 +1 );
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length = 0;
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@ -418,12 +455,13 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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struct mdns_hdr *hdr;
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struct mdns_answer ans;
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struct mdns_service serv;
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struct mdns_auth auth;
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struct mdns_a_rr a_rr;
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struct pbuf *p ,*p_sta;
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char *query, *nptr;
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char *query_end;
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const char *pHostname;
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const char *name = info->host_name;
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int max_ttl = dst_addr ? 10 : 7200;
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u8_t n;
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u8_t i = 0;
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u16_t length = 0;
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@ -443,6 +481,7 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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hdr->id = htons(id);
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hdr->flags1 = DNS_FLAG1_RESPONSE;
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hdr->numanswers = htons(4);
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hdr->numextrarr = htons(1);
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query = (char*) hdr + SIZEOF_DNS_HDR;
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query_end = (char *) p->payload + p->tot_len;
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c_strlcpy(tmpBuf, service_name_with_suffix, sizeof(tmpBuf));
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@ -474,7 +513,7 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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ans.type = htons(DNS_RRTYPE_PTR);
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ans.class = htons(DNS_RRCLASS_IN);
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ans.ttl = htonl(300);
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ans.ttl = htonl(min(max_ttl, 300));
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length = os_strlen(ms_info->host_desc) + MDNS_LENGTH_ADD + 1;
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ans.len = htons(length);
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length = 0;
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@ -508,7 +547,7 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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/* fill the answer */
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ans.type = htons(DNS_RRTYPE_TXT);
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ans.class = htons(dns_class);
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ans.ttl = htonl(300);
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ans.ttl = htonl(min(max_ttl, 300));
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// length = os_strlen(TXT_DATA) + MDNS_LENGTH_ADD + 1;
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const char *attributes[12];
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int attr_count = 0;
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@ -541,7 +580,8 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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query = query + SIZEOF_DNS_ANSWER;
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// Check enough space in the packet
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const char *end_of_packet = query + length + 2 + SIZEOF_DNS_ANSWER + SIZEOF_MDNS_SERVICE +
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os_strlen(ms_info->host_name) + 7 + 1 + 2 + SIZEOF_DNS_ANSWER + SIZEOF_MDNS_AUTH;
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os_strlen(ms_info->host_name) + 7 + 1 + 2 + SIZEOF_DNS_ANSWER + SIZEOF_MDNS_A_RR +
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2 + SIZEOF_DNS_ANSWER + 5;
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if (query_end <= end_of_packet) {
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MDNS_DBG("Too much data to send\n");
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@ -577,7 +617,7 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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ans.type = htons(DNS_RRTYPE_SRV);
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ans.class = htons(dns_class);
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ans.ttl = htonl(300);
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ans.ttl = htonl(min(max_ttl, 300));
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c_strlcpy(tmpBuf,ms_info->host_name, sizeof(tmpBuf));
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c_strlcat(tmpBuf, ".", sizeof(tmpBuf));
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c_strlcat(tmpBuf, MDNS_LOCAL, sizeof(tmpBuf));
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@ -620,7 +660,7 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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ans.type = htons(DNS_RRTYPE_A);
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ans.class = htons(dns_class);
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ans.ttl = htonl(300);
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ans.ttl = htonl(min(max_ttl, 300));
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ans.len = htons(DNS_IP_ADDR_LEN);
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MEMCPY( query, &ans, SIZEOF_DNS_ANSWER);
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@ -633,15 +673,33 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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/* fill the payload of the mDNS message */
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/* set the local IP address */
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auth.src = 0;
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MEMCPY( query, &auth, SIZEOF_MDNS_AUTH);
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u8_t *addr_ptr = query + ((char *) &auth.src - (char *) &auth);
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a_rr.src = 0;
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MEMCPY( query, &a_rr, SIZEOF_MDNS_A_RR);
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u8_t *addr_ptr = query + ((char *) &a_rr.src - (char *) &a_rr);
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/* resize the query */
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query = query + SIZEOF_MDNS_AUTH;
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query = query + SIZEOF_MDNS_A_RR;
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// Append the NSEC record that says we only have an A record
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*query++ = 0xc0 + (hostname_offset >> 8);
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*query++ = hostname_offset & 0xff;
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ans.type = htons(DNS_RRTYPE_NSEC);
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ans.class = htons(dns_class);
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ans.ttl = htonl(min(max_ttl, 300));
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ans.len = htons(5);
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MEMCPY( query, &ans, SIZEOF_DNS_ANSWER);
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query = query + SIZEOF_DNS_ANSWER;
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*query++ = 0xc0 + (hostname_offset >> 8);
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*query++ = hostname_offset & 0xff;
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*query++ = 0;
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*query++ = 1;
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*query++ = 0x40;
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//MDNS_DBG("Final ptr=%x\n", query);
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// increment by sizeof_mdns_auth
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// increment by sizeof_mdns_a_rr
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/* set the name of the authority field.
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* The same name as the Query using the offset address*/
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@ -650,6 +708,13 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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pbuf_realloc(p, (query) - ((char*) (p->payload)));
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err = send_packet(p, dst_addr, dst_port, addr_ptr);
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if (!dst_addr) {
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// this is being sent multicast...
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// so reset the timer
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os_timer_disarm(&mdns_timer);
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os_timer_arm(&mdns_timer, 1000 * 280, 1);
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}
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} else {
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MDNS_DBG("ERR_MEM \n");
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err = ERR_MEM;
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@ -658,6 +723,137 @@ mdns_send_service(struct nodemcu_mdns_info *info, u16_t id, struct ip_addr *dst_
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return err;
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}
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static char *append_nsec_record(char *query, u32_t actual_rr, int max_ttl) {
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struct mdns_answer ans;
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ans.type = htons(DNS_RRTYPE_NSEC);
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ans.class = htons(DNS_RRCLASS_IN);
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ans.ttl = htonl(min(max_ttl, 300));
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ans.len = htons(9);
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MEMCPY( query, &ans, SIZEOF_DNS_ANSWER);
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char *rr_len = query + ((char *) &ans.len - (char *) &ans) + 1;
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query = query + SIZEOF_DNS_ANSWER;
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*query++ = 0xc0;
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*query++ = sizeof(struct mdns_hdr);
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*query++ = 0;
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char *bm_len = query;
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*query++ = 5;
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char *abase = query;
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*query++ = 0;
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*query++ = 0;
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*query++ = 0;
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*query++ = 0;
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*query++ = 0;
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while (actual_rr > 0) {
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int v = actual_rr & 255;
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if (v < 5 * 8) {
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abase[v >> 3] |= 0x80 >> (v & 7);
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actual_rr = actual_rr >> 8;
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}
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}
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while (query[-1] == 0) {
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query--;
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(*bm_len)--;
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(*rr_len)--;
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}
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return query;
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}
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/**
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* This sends an empty response -- this is used when we doin't have an RR to send
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* but the name exists
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*/
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static void
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mdns_send_no_rr(struct mdns_hdr *req, const char *name, u32_t actual_rr, struct ip_addr *dst_addr, u16_t dst_port) {
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int max_ttl = dst_addr ? 10 : 7200;
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struct pbuf *p;
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p = pbuf_alloc(PBUF_TRANSPORT,
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SIZEOF_DNS_HDR + MDNS_MAX_NAME_LENGTH * 2 + SIZEOF_DNS_QUERY, PBUF_RAM);
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if (p != NULL) {
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LWIP_ASSERT("pbuf must be in one piece", p->next == NULL);
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/* fill dns header */
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struct mdns_hdr *hdr = (struct mdns_hdr*) p->payload;
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os_memset(hdr, 0, SIZEOF_DNS_HDR);
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hdr->id = req->id;
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hdr->flags1 = DNS_FLAG1_RESPONSE;
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hdr->numextrarr = htons(1);
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char *query = (char*) hdr + SIZEOF_DNS_HDR;
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char *query_end = (char *) p->payload + p->tot_len;
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// Now copy over the dns name
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int len = strlen(name);
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if (query_end - query >= len + SIZEOF_DNS_QUERY + 15) {
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query = copy_and_encode_name((char *) (hdr + 1), name);
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query = append_nsec_record(query, actual_rr, max_ttl);
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// Set the length code correctly
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pbuf_realloc(p, query - ((char*) (p->payload)));
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send_packet(p, dst_addr, dst_port, NULL);
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}
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}
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}
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/**
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* This sends a single A record and the NSEC record as additional
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*/
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static void
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mdns_send_a_rr(struct mdns_hdr *req, const char *name, struct ip_addr *dst_addr, u16_t dst_port) {
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int max_ttl = dst_addr ? 10 : 7200;
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struct pbuf *p;
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p = pbuf_alloc(PBUF_TRANSPORT,
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SIZEOF_DNS_HDR + MDNS_MAX_NAME_LENGTH * 2 + SIZEOF_DNS_QUERY, PBUF_RAM);
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if (p != NULL) {
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LWIP_ASSERT("pbuf must be in one piece", p->next == NULL);
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/* fill dns header */
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struct mdns_hdr *hdr = (struct mdns_hdr*) p->payload;
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os_memset(hdr, 0, SIZEOF_DNS_HDR);
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hdr->id = req->id;
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hdr->flags1 = DNS_FLAG1_RESPONSE;
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hdr->numanswers = htons(1);
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hdr->numextrarr = htons(1);
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char *query = (char*) hdr + SIZEOF_DNS_HDR;
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char *query_end = (char *) p->payload + p->tot_len;
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// Now copy over the dns name
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int len = strlen(name) + 1;
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if (query_end - query >= len + SIZEOF_DNS_QUERY + 4 + 2 + 4 + 15) {
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query = copy_and_encode_name((char *) (hdr + 1), name);
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struct mdns_answer ans;
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ans.type = htons(DNS_RRTYPE_A);
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ans.class = htons(DNS_RRCLASS_IN);
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ans.ttl = htonl(min(max_ttl, 300));
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ans.len = htons(4);
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MEMCPY( query, &ans, SIZEOF_DNS_ANSWER);
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query = query + SIZEOF_DNS_ANSWER;
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char *addr_ptr = query;
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query += 4;
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// Now add the NSEC record
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*query++ = 0xc0;
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*query++ = sizeof(*hdr);
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query = append_nsec_record(query, DNS_RRTYPE_A, max_ttl);
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// Set the length code correctly
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pbuf_realloc(p, query - ((char*) (p->payload)));
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send_packet(p, dst_addr, dst_port, addr_ptr);
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}
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}
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}
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/**
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* Receive input function for DNS response packets arriving for the dns UDP pcb.
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*
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@ -695,52 +891,78 @@ mdns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr,
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nquestions = htons(hdr->numquestions);
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//nanswers = htons(hdr->numanswers);
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/* if we have a question send an answer if necessary */
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if (nquestions > 0) {
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u8_t qno;
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u8_t *qptr = (u8_t *) (hdr + 1);
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u8_t *qend = mdns_payload + p->tot_len;
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for (qno = 0; qno < nquestions && qptr < qend; qno++) {
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char tmpBuf[PUCK_DATASHEET_SIZE + PUCK_SERVICE_LENGTH];
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struct mdns_query qry;
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int namelen = mdns_namelen((u8_t *) (hdr + 1), p->tot_len);
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int namelen = mdns_namelen(qptr, qend - qptr);
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memcpy(&qry, namelen + (u8_t *) (hdr + 1), sizeof(qry));
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memcpy(&qry, namelen + qptr, sizeof(qry));
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u16_t qry_type = ntohs(qry.type);
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if (port == 5353 && (ntohs(qry.class) & 0x8000) == 0) {
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addr = NULL;
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}
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u32_t actual_rr = 0;
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const char *no_rr_name = NULL;
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/* MDNS_DS_DOES_NAME_CHECK */
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/* Check if the name in the "question" part match with the name of the MDNS DS service. */
|
||||
if (mdns_compare_name((unsigned char *) DNS_SD_SERVICE,
|
||||
(unsigned char *) mdns_payload + SIZEOF_DNS_HDR) == 0) {
|
||||
(unsigned char *) qptr, (unsigned char *) hdr) == 0) {
|
||||
if (qry_type == DNS_RRTYPE_PTR || qry_type == DNS_RRTYPE_ANY) {
|
||||
mdns_send_service_type(i, addr, port);
|
||||
} else {
|
||||
no_rr_name = DNS_SD_SERVICE;
|
||||
actual_rr = DNS_RRTYPE_PTR;
|
||||
}
|
||||
} else if (mdns_compare_name((unsigned char *) service_name_with_suffix,
|
||||
(unsigned char *) mdns_payload + SIZEOF_DNS_HDR) == 0) {
|
||||
|
||||
(unsigned char *) qptr, (unsigned char *) hdr) == 0) {
|
||||
if (qry_type == DNS_RRTYPE_PTR || qry_type == DNS_RRTYPE_ANY) {
|
||||
mdns_send_service(info, i, addr, port);
|
||||
} else {
|
||||
no_rr_name = service_name_with_suffix;
|
||||
actual_rr = DNS_RRTYPE_PTR;
|
||||
}
|
||||
} else {
|
||||
|
||||
char tmpBuf[PUCK_DATASHEET_SIZE + PUCK_SERVICE_LENGTH];
|
||||
c_strlcpy(tmpBuf,ms_info->host_name, sizeof(tmpBuf));
|
||||
c_strlcat(tmpBuf, ".", sizeof(tmpBuf));
|
||||
c_strlcat(tmpBuf, MDNS_LOCAL, sizeof(tmpBuf));
|
||||
no_rr_name = tmpBuf;
|
||||
|
||||
if (mdns_compare_name((unsigned char *) tmpBuf,
|
||||
(unsigned char *) mdns_payload + SIZEOF_DNS_HDR) == 0) {
|
||||
(unsigned char *) qptr, (unsigned char *) hdr) == 0) {
|
||||
if (qry_type == DNS_RRTYPE_A || qry_type == DNS_RRTYPE_ANY) {
|
||||
mdns_send_service(info, i, addr, port);
|
||||
mdns_send_a_rr(hdr, tmpBuf, addr, port);
|
||||
} else {
|
||||
actual_rr = DNS_RRTYPE_A;
|
||||
}
|
||||
} else {
|
||||
c_strlcpy(tmpBuf,ms_info->host_desc, sizeof(tmpBuf));
|
||||
c_strlcat(tmpBuf, ".", sizeof(tmpBuf));
|
||||
c_strlcat(tmpBuf, service_name_with_suffix, sizeof(tmpBuf));
|
||||
if (mdns_compare_name((unsigned char *) tmpBuf,
|
||||
(unsigned char *) mdns_payload + SIZEOF_DNS_HDR) == 0) {
|
||||
(unsigned char *) qptr, (unsigned char *) hdr) == 0) {
|
||||
if (qry_type == DNS_RRTYPE_TXT || qry_type == DNS_RRTYPE_SRV || qry_type == DNS_RRTYPE_ANY) {
|
||||
mdns_send_service(info, i, addr, port);
|
||||
} else {
|
||||
actual_rr = (DNS_RRTYPE_TXT << 8) + DNS_RRTYPE_SRV;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (actual_rr) {
|
||||
mdns_send_no_rr(hdr, no_rr_name, actual_rr, addr, port);
|
||||
}
|
||||
|
||||
qptr += namelen + sizeof(qry); // Now points to next question
|
||||
}
|
||||
}
|
||||
memerr1:
|
||||
|
|
@ -908,7 +1130,7 @@ nodemcu_mdns_init(struct nodemcu_mdns_info *info) {
|
|||
//MDNS_DBG("About to start timer\n");
|
||||
os_timer_disarm(&mdns_timer);
|
||||
os_timer_setfn(&mdns_timer, (os_timer_func_t *)mdns_reg,ms_info);
|
||||
os_timer_arm(&mdns_timer, 1000 * 120, 1);
|
||||
os_timer_arm(&mdns_timer, 1000 * 280, 1);
|
||||
/* kick off the first one right away */
|
||||
mdns_reg_handler_restart();
|
||||
mdns_reg(ms_info);
|
||||
|
|
|
|||
Loading…
Reference in New Issue