Merge pull request #505 from ourairquality/mdns-responder1
mDNS-responder: ipv6 support and fixes
This commit is contained in:
commit
131da5b4f2
2 changed files with 340 additions and 249 deletions
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@ -1,9 +1,10 @@
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/*
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* Basic multicast DNS responder
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*
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* Advertises the IP address, port, and characteristics of a service to other devices using multicast DNS on the same LAN,
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* so they can find devices with addresses dynamically allocated by DHCP. See avahi, Bonjour, etc
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* See RFC6762, RFC6763
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* Advertises the IP address, port, and characteristics of a service to other
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* devices using multicast DNS on the same LAN, so they can find devices with
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* addresses dynamically allocated by DHCP. See avahi, Bonjour, etc. See
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* RFC6762, RFC6763
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*
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* This sample code is in the public domain.
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*
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@ -26,22 +27,21 @@
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#include <lwip/netdb.h>
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#include <lwip/dns.h>
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#include <lwip/prot/dns.h>
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#include <lwip/prot/iana.h>
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#include <lwip/udp.h>
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#include <lwip/igmp.h>
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#include <lwip/netif.h>
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#include "mdnsresponder.h"
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#if !LWIP_IGMP
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#error "LWIP_IGMP needs to be defined in lwipopts.h"
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#endif
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#define qDebugLog // Log activity generally
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#define qLogIncoming // Log all arriving multicast packets
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#define qLogAllTraffic // Log and decode all mDNS packets
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#define kMDNSStackSize 800
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#define DNS_MULTICAST_ADDRESS "224.0.0.251" // RFC 6762
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#define DNS_MDNS_PORT 5353 // RFC 6762
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#define DNS_MSG_SIZE 512
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//-------------------------------------------------------------------
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#ifdef PACK_STRUCT_USE_INCLUDES
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@ -120,13 +120,15 @@ typedef struct mdns_rsrc {
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} mdns_rsrc;
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static struct udp_pcb* gMDNS_pcb = NULL;
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static ip_addr_t gMulticastAddr; // == DNS_MULTICAST_ADDRESS
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static const ip_addr_t gMulticastV4Addr = DNS_MQUERY_IPV4_GROUP_INIT;
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#if LWIP_IPV6
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#include "lwip/mld6.h"
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static const ip_addr_t gMulticastV6Addr = DNS_MQUERY_IPV6_GROUP_INIT;
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#endif
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static mdns_rsrc* gDictP = NULL; // RR database, linked list
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//---------------------- Debug/logging utilities -------------------------
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#ifdef qDebugLog
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// DNS field TYPE used for "Resource Records", some additions
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#define DNS_RRTYPE_AAAA 28 /* IPv6 host address */
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#define DNS_RRTYPE_SRV 33 /* Service record */
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@ -146,6 +148,7 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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#define DNS_FLAG2_RA 0x80
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#define DNS_FLAG2_RESMASK 0x0F
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#ifdef qDebugLog
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static char qstr[12];
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static char* mdns_qrtype(uint16_t typ)
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@ -160,11 +163,11 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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case DNS_RRTYPE_NSEC : return ("NSEC ");
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case DNS_RRTYPE_ANY : return ("ANY");
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}
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sprintf(qstr,"type %d",typ);
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sprintf(qstr, "type %d", typ);
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return qstr;
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}
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#ifdef qLogAllTraffic
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#ifdef qLogAllTraffic
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static void mdns_printhex(u8_t* p, int n)
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{
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@ -183,7 +186,9 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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n = *p++;
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cp = (char*)p;
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for (i=0; i<n; i++) putchar(*cp++);
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for (i = 0; i < n; i++) {
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putchar(*cp++);
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}
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}
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static char cstr[16];
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@ -198,9 +203,9 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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return cstr;
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}
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static u8_t* mdns_print_name(u8_t* p, struct mdns_hdr* hp)
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// Sequence of Pascal strings, terminated by zero-length string
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// Handles compression, returns ptr to next item
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static u8_t* mdns_print_name(u8_t* p, struct mdns_hdr* hp)
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{
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char* cp = (char*)p;
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int i, n;
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@ -210,17 +215,17 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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if ((n & 0xC0) == 0xC0) {
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n = (n & 0x3F) << 8;
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n |= (u8_t)*cp++;
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mdns_print_name( (u8_t*)hp + n ,hp );
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mdns_print_name((u8_t*)hp + n, hp);
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n = 0;
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} else if (n & 0xC0) {
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printf("<label $%X?>",n);
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n = 0;
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} else {
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for (i=0; i<n; i++)
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for (i = 0; i < n; i++)
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putchar(*cp++);
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if (n!=0) putchar('.');
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if (n != 0) putchar('.');
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}
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} while (n>0);
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} while (n > 0);
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return (u8_t*)cp;
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}
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@ -230,10 +235,10 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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if (hdr->flags1 & DNS_FLAG1_RESP) {
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printf("Response, ID $%X %s ", htons(hdr->id), (hdr->flags1 & DNS_FLAG1_AUTH) ? "Auth " : "Non-auth ");
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if (hdr->flags2 & DNS_FLAG2_RA) printf("RA ");
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if ((hdr->flags2 & DNS_FLAG2_RESMASK)==0) printf("noerr");
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if ((hdr->flags2 & DNS_FLAG2_RESMASK) == 0) printf("noerr");
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else printf("err %d", hdr->flags2 & DNS_FLAG2_RESMASK);
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} else {
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printf("Query, ID $%X op %d", htons(hdr->id), (hdr->flags1>>4) & 0x7 );
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printf("Query, ID $%X op %d", htons(hdr->id), (hdr->flags1 >> 4) & 0x7 );
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}
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if (hdr->flags1 & DNS_FLAG1_RD) printf("RD ");
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if (hdr->flags1 & DNS_FLAG1_TRUNC) printf("[TRUNC] ");
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@ -249,13 +254,13 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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return (u8_t*)hdr + SIZEOF_DNS_HDR;
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}
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static u8_t* mdns_print_query(u8_t* p)
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// Copy needed because it may be misaligned
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static u8_t* mdns_print_query(u8_t* p)
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{
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struct mdns_query q;
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uint16_t c;
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memcpy(&q,p,SIZEOF_DNS_QUERY);
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memcpy(&q, p, SIZEOF_DNS_QUERY);
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c = htons(q.class);
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printf(" %s %s", mdns_qrtype(htons(q.type)), mdns_qclass(c & 0x7FFF) );
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if (c & 0x8000) printf(" unicast-req");
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@ -263,8 +268,8 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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return p + SIZEOF_DNS_QUERY;
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}
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static u8_t* mdns_print_answer(u8_t* p, struct mdns_hdr* hp)
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// Copy needed because it may be misaligned
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static u8_t* mdns_print_answer(u8_t* p, struct mdns_hdr* hp)
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{
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struct mdns_answer ans;
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u16_t rrlen, atype, rrClass;;
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@ -278,23 +283,23 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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printf("cache-flush ");
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if (rrlen > 0) {
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u8_t* rp = p + SIZEOF_DNS_ANSWER;
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if (atype==DNS_RRTYPE_A && rrlen==4) {
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if (atype == DNS_RRTYPE_A && rrlen == 4) {
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printf("%d.%d.%d.%d\n",rp[0],rp[1],rp[2],rp[3]);
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} else if (atype==DNS_RRTYPE_PTR) {
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} else if (atype == DNS_RRTYPE_PTR) {
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mdns_print_name(rp, hp);
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printf("\n");
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} else if (atype==DNS_RRTYPE_TXT) {
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} else if (atype == DNS_RRTYPE_TXT) {
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mdns_print_pstr(rp);
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printf("\n");
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} else if (atype==DNS_RRTYPE_SRV && rrlen > SIZEOF_DNS_RR_SRV) {
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} else if (atype == DNS_RRTYPE_SRV && rrlen > SIZEOF_DNS_RR_SRV) {
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struct mdns_rr_srv srvRR;
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memcpy(&srvRR,rp,SIZEOF_DNS_RR_SRV);
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printf("prio %d, weight %d, port %d, target ", srvRR.prio, srvRR.weight, srvRR.port);
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memcpy(&srvRR, rp, SIZEOF_DNS_RR_SRV);
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printf("prio %d, weight %d, port %d, target ", srvRR.prio, srvRR.weight, ntohs(srvRR.port));
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mdns_print_name(rp + SIZEOF_DNS_RR_SRV, hp);
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printf("\n");
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} else {
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printf("%db:",rrlen);
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mdns_printhex(rp,rrlen);
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printf("%db:", rrlen);
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mdns_printhex(rp, rrlen);
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}
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} else
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printf("\n");
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@ -304,50 +309,49 @@ static mdns_rsrc* gDictP = NULL; // RR database, linked list
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static int mdns_print_msg(u8_t* msgP, int msgLen)
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{
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int i;
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u8_t* tp;
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u8_t* limP = msgP + msgLen;
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u8_t *tp;
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u8_t *limP = msgP + msgLen;
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struct mdns_hdr* hdr;
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hdr = (struct mdns_hdr*) msgP;
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tp = mdns_print_header(hdr);
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for (i=0; i<htons(hdr->numquestions); i++) {
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printf(" Q%d: ",i+1);
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tp = mdns_print_name(tp,hdr);
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for (i = 0; i < htons(hdr->numquestions); i++) {
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printf(" Q%d: ", i + 1);
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tp = mdns_print_name(tp, hdr);
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tp = mdns_print_query(tp);
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if (tp > limP) return 0;
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}
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for (i=0; i<htons(hdr->numanswers); i++) {
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printf(" A%d: ",i+1);
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tp = mdns_print_name(tp,hdr);
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tp = mdns_print_answer(tp,hdr);
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for (i = 0; i < htons(hdr->numanswers); i++) {
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printf(" A%d: ", i + 1);
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tp = mdns_print_name(tp, hdr);
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tp = mdns_print_answer(tp, hdr);
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if (tp > limP) return 0;
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}
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for (i=0; i<htons(hdr->numauthrr); i++) {
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printf(" AuRR%d: ",i+1);
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tp = mdns_print_name(tp,hdr);
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tp = mdns_print_answer(tp,hdr);
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for (i = 0; i < htons(hdr->numauthrr); i++) {
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printf(" AuRR%d: ", i + 1);
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tp = mdns_print_name(tp, hdr);
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tp = mdns_print_answer(tp, hdr);
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if (tp > limP) return 0;
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}
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for (i=0; i<htons(hdr->numextrarr); i++) {
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printf(" ExRR%d: ",i+1);
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tp = mdns_print_name(tp,hdr);
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tp = mdns_print_answer(tp,hdr);
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for (i = 0; i < htons(hdr->numextrarr); i++) {
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printf(" ExRR%d: ", i + 1);
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tp = mdns_print_name(tp, hdr);
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tp = mdns_print_answer(tp, hdr);
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if (tp > limP) return 0;
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}
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return 1;
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}
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#endif
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#endif // qLogAllTraffic
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#endif // qDebugLog
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//---------------------------------------------------------------------------
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static u8_t* mdns_labels2str(u8_t* hdrP, u8_t* p, char* qStr)
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// Convert a DNS domain name label sequence into C string with . seperators
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// Handles compression
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static u8_t* mdns_labels2str(u8_t* hdrP, u8_t* p, char* qStr)
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{
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int i, n;
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@ -362,51 +366,51 @@ static u8_t* mdns_labels2str(u8_t* hdrP, u8_t* p, char* qStr)
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printf(">>> mdns_labels2str,label $%X?",n);
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return p;
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} else {
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for (i=0; i<n; i++)
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for (i = 0; i < n; i++)
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*qStr++ = *p++;
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if (n==0) *qStr++ = 0;
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if (n == 0) *qStr++ = 0;
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else *qStr++ = '.';
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}
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} while (n>0);
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return p;
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}
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static int mdns_str2labels(const char* name, u8_t* lseq, int max)
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// Encode a <string>.<string>.<string> as a sequence of labels, return length
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static int mdns_str2labels(const char* name, u8_t* lseq, int max)
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{
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int i,n,sdx,idx = 0;
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int i, n, sdx, idx = 0;
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int lc = 0;
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do {
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sdx = idx;
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while (name[idx] != '.' && name[idx] != 0) idx++;
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n = idx-sdx;
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*lseq++ = n;
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lc++;
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if (lc+n > max) {
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printf(">>> mdns_str2labels: oversize (%d)\n",lc+n);
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n = idx - sdx;
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if (lc + 1 + n > max) {
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printf(">>> mdns_str2labels: oversize (%d)\n", lc + 1 + n);
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return 0;
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}
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for (i=0; i<n; i++)
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*lseq++ = name[sdx+i];
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*lseq++ = n;
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lc++;
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for (i = 0; i < n; i++)
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*lseq++ = name[sdx + i];
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lc += n;
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if (name[idx]=='.')
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if (name[idx] == '.')
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idx++;
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} while (n>0);
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} while (n > 0);
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return lc;
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}
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static u8_t* mdns_get_question(u8_t* hdrP, u8_t* qp, char* qStr, uint16_t* qClass, uint16_t* qType, u8_t* qUnicast)
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// Unpack a DNS question RR at qp, return pointer to next RR
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static u8_t* mdns_get_question(u8_t* hdrP, u8_t* qp, char* qStr, uint16_t* qClass, uint16_t* qType, u8_t* qUnicast)
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{
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struct mdns_query qr;
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uint16_t cls;
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qp = mdns_labels2str(hdrP, qp, qStr);
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memcpy(&qr,qp,SIZEOF_DNS_QUERY);
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memcpy(&qr, qp, SIZEOF_DNS_QUERY);
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*qType = htons(qr.type);
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cls = htons(qr.class);
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*qUnicast = cls>>15;
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*qUnicast = cls >> 15;
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*qClass = cls & 0x7FFF;
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return qp + SIZEOF_DNS_QUERY;
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}
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@ -414,8 +418,8 @@ static u8_t* mdns_get_question(u8_t* hdrP, u8_t* qp, char* qStr, uint16_t* qClas
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//---------------------------------------------------------------------------
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static void mdns_add_response(const char* vKey, u16_t vType, u32_t ttl, const void* dataP, u16_t vDataSize)
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// Add a record to the RR database list
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static void mdns_add_response(const char* vKey, u16_t vType, u32_t ttl, const void* dataP, u16_t vDataSize)
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{
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mdns_rsrc* rsrcP;
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int keyLen, recSize;
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@ -423,9 +427,9 @@ static void mdns_add_response(const char* vKey, u16_t vType, u32_t ttl, const vo
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keyLen = strlen(vKey) + 1;
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recSize = sizeof(mdns_rsrc) - kDummyDataSize + keyLen + vDataSize;
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rsrcP = (mdns_rsrc*)malloc(recSize);
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if (rsrcP==NULL)
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if (rsrcP == NULL) {
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printf(">>> mdns_add_response: couldn't alloc %d\n",recSize);
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else {
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} else {
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rsrcP->rType = vType;
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rsrcP->rTTL = ttl;
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rsrcP->rKeySize = keyLen;
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|
@ -434,20 +438,21 @@ static void mdns_add_response(const char* vKey, u16_t vType, u32_t ttl, const vo
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memcpy(&rsrcP->rData[keyLen], dataP, vDataSize);
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rsrcP->rNext = gDictP;
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gDictP = rsrcP;
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#ifdef qDebugLog
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printf("mDNS added RR '%s' %s, %d bytes\n", vKey, mdns_qrtype(vType), vDataSize);
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#endif
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#ifdef qDebugLog
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printf("mDNS added RR '%s' %s, %d bytes\n", vKey, mdns_qrtype(vType), vDataSize);
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#endif
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}
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}
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void mdns_add_PTR(const char* rKey, u32_t ttl, const char* nmStr)
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{
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int nl;
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size_t nl;
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u8_t lBuff[kMaxNameSize];
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nl = mdns_str2labels(nmStr,lBuff,sizeof(lBuff));
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if (nl>0)
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nl = mdns_str2labels(nmStr, lBuff, sizeof(lBuff));
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if (nl > 0) {
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mdns_add_response(rKey, DNS_RRTYPE_PTR, ttl, lBuff, nl);
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}
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}
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void mdns_add_SRV(const char* rKey, u32_t ttl, u16_t rPort, const char* targName)
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@ -463,91 +468,101 @@ void mdns_add_SRV(const char* rKey, u32_t ttl, u16_t rPort, const char* targName
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temp.srvRR.prio = 0;
|
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temp.srvRR.weight = 0;
|
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temp.srvRR.port = htons(rPort);
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nl = mdns_str2labels(targName,temp.lBuff,sizeof(temp.lBuff));
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if (nl>0)
|
||||
nl = mdns_str2labels(targName, temp.lBuff, sizeof(temp.lBuff));
|
||||
if (nl > 0)
|
||||
mdns_add_response(rKey, DNS_RRTYPE_SRV, ttl, &temp, SIZEOF_DNS_RR_SRV + nl);
|
||||
}
|
||||
|
||||
void mdns_add_TXT(const char* rKey, u32_t ttl, const char* txStr)
|
||||
// Single TXT str, can be concatenated
|
||||
void mdns_add_TXT(const char* rKey, u32_t ttl, const char* txStr)
|
||||
{
|
||||
char pstr[256];
|
||||
u16_t n = strlen(txStr);
|
||||
if (n > 255)
|
||||
if (n > 255) {
|
||||
printf(">>> mdns_add_TXT oversize (%d)\n",n);
|
||||
else {
|
||||
pstr[0] = n;
|
||||
memcpy(&pstr[1],txStr,n);
|
||||
mdns_add_response(rKey, DNS_RRTYPE_TXT, ttl, txStr, n+1);
|
||||
return;
|
||||
}
|
||||
|
||||
char *pstr = malloc(n + 1);
|
||||
pstr[0] = n;
|
||||
memcpy(&pstr[1], txStr, n);
|
||||
mdns_add_response(rKey, DNS_RRTYPE_TXT, ttl, pstr, n + 1);
|
||||
free(pstr);
|
||||
}
|
||||
|
||||
void mdns_add_A(const char* rKey, u32_t ttl, ip_addr_t addr)
|
||||
void mdns_add_A(const char* rKey, u32_t ttl, const ip4_addr_t *addr)
|
||||
{
|
||||
mdns_add_response(rKey, DNS_RRTYPE_A, ttl, &addr, sizeof(addr));
|
||||
mdns_add_response(rKey, DNS_RRTYPE_A, ttl, addr, sizeof(ip4_addr_t));
|
||||
}
|
||||
|
||||
#if LWIP_IPV6
|
||||
void mdns_add_AAAA(const char* rKey, u32_t ttl, const ip6_addr_t *addr)
|
||||
{
|
||||
mdns_add_response(rKey, DNS_RRTYPE_AAAA, ttl, addr, sizeof(addr->addr));
|
||||
}
|
||||
#endif
|
||||
|
||||
void mdns_add_facility( const char* instanceName, // Friendly name, need not be unique
|
||||
const char* serviceName, // Must be "name", e.g. "hap" or "http"
|
||||
const char* serviceName, // Must be "_name", e.g. "_hap" or "_http"
|
||||
const char* addText, // Must be <key>=<value>
|
||||
mdns_flags flags, // TCP or UDP
|
||||
u16_t onPort, // port number
|
||||
u32_t ttl // seconds
|
||||
)
|
||||
{
|
||||
char key[64];
|
||||
char fullName[128];
|
||||
char devName[96];
|
||||
struct ip_info ipInfo;
|
||||
size_t key_len = strlen(serviceName) + 12;
|
||||
char *key = malloc(key_len + 1);
|
||||
size_t full_name_len = strlen(instanceName) + 1 + key_len;
|
||||
char *fullName = malloc(full_name_len + 1);
|
||||
size_t dev_name_len = strlen(instanceName) + 7;
|
||||
char *devName = malloc(dev_name_len + 1);
|
||||
|
||||
#ifdef qDebugLog
|
||||
printf("\nmDNS advertising instance %s protocol %s text %s on port %d %s TTL %d secs\n",
|
||||
instanceName, serviceName, addText, onPort, (flags & mdns_UDP) ? "UDP" : "TCP", ttl);
|
||||
#endif
|
||||
#ifdef qDebugLog
|
||||
printf("\nmDNS advertising instance %s protocol %s", instanceName, serviceName);
|
||||
if (addText) {
|
||||
printf(" text %s", addText);
|
||||
}
|
||||
printf(" on port %d %s TTL %d secs\n", onPort, (flags & mdns_UDP) ? "UDP" : "TCP", ttl);
|
||||
#endif
|
||||
|
||||
snprintf(key, sizeof(key), "%s.%s.local.", serviceName, (flags & mdns_UDP) ? "_udp" :"_tcp");
|
||||
snprintf(fullName, sizeof(fullName), "%s.%s", instanceName, key);
|
||||
snprintf(devName, sizeof(devName), "%s.local.", instanceName);
|
||||
|
||||
if (!sdk_wifi_get_ip_info(STATION_IF,&ipInfo))
|
||||
ipInfo.ip.addr = IPADDR_NONE;
|
||||
snprintf(key, key_len + 1, "%s.%s.local.", serviceName, (flags & mdns_UDP) ? "_udp" :"_tcp");
|
||||
snprintf(fullName, full_name_len + 1, "%s.%s", instanceName, key);
|
||||
snprintf(devName, dev_name_len + 1, "%s.local.", instanceName);
|
||||
|
||||
// Order has significance for extraRR feature
|
||||
mdns_add_TXT(fullName, ttl, addText);
|
||||
mdns_add_A(devName, ttl, ipInfo.ip);
|
||||
if (addText) {
|
||||
mdns_add_TXT(fullName, ttl, addText);
|
||||
}
|
||||
|
||||
#if LWIP_IPV6
|
||||
const ip6_addr_t addr6 = { {0ul, 0ul, 0ul, 0ul} };
|
||||
mdns_add_AAAA(devName, ttl, &addr6);
|
||||
#endif
|
||||
|
||||
const ip4_addr_t addr4 = { 0 };
|
||||
mdns_add_A(devName, ttl, &addr4);
|
||||
|
||||
mdns_add_SRV(fullName, ttl, onPort, devName);
|
||||
mdns_add_PTR(key, ttl, fullName);
|
||||
|
||||
// Optional, makes us browsable
|
||||
if (flags & mdns_Browsable)
|
||||
mdns_add_PTR("_services._dns-sd._udp.local.",ttl,key);
|
||||
}
|
||||
|
||||
static void mdns_update_ipaddr(struct ip_info* ipInfo)
|
||||
// IP address has been defined/changed: update any A records with the new IP
|
||||
{
|
||||
mdns_rsrc* rp = gDictP;
|
||||
while (rp != NULL) {
|
||||
if (rp->rType==DNS_RRTYPE_A) {
|
||||
#ifdef qDebugLog
|
||||
printf("Updating A record for '%s' to %d.%d.%d.%d\n", rp->rData,
|
||||
ip4_addr1(&ipInfo->ip), ip4_addr2(&ipInfo->ip), ip4_addr3(&ipInfo->ip), ip4_addr4(&ipInfo->ip));
|
||||
#endif
|
||||
memcpy(&rp->rData[rp->rKeySize], &ipInfo->ip, sizeof(ip_addr_t));
|
||||
}
|
||||
rp = rp->rNext;
|
||||
if (flags & mdns_Browsable) {
|
||||
mdns_add_PTR("_services._dns-sd._udp.local.", ttl, key);
|
||||
}
|
||||
|
||||
free(key);
|
||||
free(fullName);
|
||||
free(devName);
|
||||
}
|
||||
|
||||
static mdns_rsrc* mdns_match(const char* qstr, u16_t qType)
|
||||
{
|
||||
mdns_rsrc* rp = gDictP;
|
||||
while (rp != NULL) {
|
||||
if (rp->rType==qType || qType==DNS_RRTYPE_ANY) {
|
||||
if (strcasecmp(rp->rData,qstr)==0) {
|
||||
#ifdef qDebugLog
|
||||
printf(" - matched '%s' %s\n",qstr,mdns_qrtype(rp->rType));
|
||||
#endif
|
||||
if (rp->rType == qType || qType == DNS_RRTYPE_ANY) {
|
||||
if (strcasecmp(rp->rData, qstr) == 0) {
|
||||
#ifdef qDebugLog
|
||||
printf(" - matched '%s' %s\n", qstr, mdns_qrtype(rp->rType));
|
||||
#endif
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
@ -556,11 +571,22 @@ static mdns_rsrc* mdns_match(const char* qstr, u16_t qType)
|
|||
return rp;
|
||||
}
|
||||
|
||||
static int mdns_add_to_answer(mdns_rsrc* rsrcP, u8_t* resp, int respLen)
|
||||
// Create answer RR and append to resp[respLen], return new length
|
||||
static int mdns_add_to_answer(mdns_rsrc* rsrcP, u8_t* resp, int respLen)
|
||||
{
|
||||
// Key is stored as C str, convert to labels
|
||||
respLen += mdns_str2labels(rsrcP->rData, &resp[respLen], DNS_MSG_SIZE-respLen);
|
||||
size_t rem = MDNS_RESPONDER_REPLY_SIZE - respLen;
|
||||
size_t len = mdns_str2labels(rsrcP->rData, &resp[respLen], rem);
|
||||
if (len == 0) {
|
||||
// Overflow, skip this answer.
|
||||
return respLen;
|
||||
}
|
||||
if ((len + SIZEOF_DNS_ANSWER + rsrcP->rDataSize) > rem) {
|
||||
// Overflow, skip this answer.
|
||||
printf(">>> mdns_add_to_answer: oversize (%d)\n", len + SIZEOF_DNS_ANSWER + rsrcP->rDataSize);
|
||||
return respLen;
|
||||
}
|
||||
respLen += len;
|
||||
|
||||
// Answer fields: may be misaligned, so build and memcpy
|
||||
struct mdns_answer ans;
|
||||
|
@ -580,29 +606,43 @@ static int mdns_add_to_answer(mdns_rsrc* rsrcP, u8_t* resp, int respLen)
|
|||
|
||||
//---------------------------------------------------------------------------
|
||||
|
||||
static void mdns_send_mcast(u8_t* msgP, int nBytes)
|
||||
// Send UDP to multicast address
|
||||
static void mdns_send_mcast(const ip_addr_t *addr, u8_t* msgP, int nBytes)
|
||||
{
|
||||
struct pbuf* p;
|
||||
err_t err;
|
||||
|
||||
#ifdef qLogAllTraffic
|
||||
mdns_print_msg(msgP, nBytes);
|
||||
#endif
|
||||
|
||||
p = pbuf_alloc(PBUF_TRANSPORT, nBytes, PBUF_RAM);
|
||||
if (p) {
|
||||
memcpy(p->payload, msgP, nBytes);
|
||||
err = udp_sendto(gMDNS_pcb, p, &gMulticastAddr, DNS_MDNS_PORT);
|
||||
if (err==ERR_OK) {
|
||||
#ifdef qDebugLog
|
||||
printf(" - responded with %d bytes err %d\n",nBytes,err);
|
||||
#endif
|
||||
const ip_addr_t *dest_addr;
|
||||
if (IP_IS_V6_VAL(*addr)) {
|
||||
#if LWIP_IPV6
|
||||
dest_addr = &gMulticastV6Addr;
|
||||
#endif
|
||||
} else {
|
||||
dest_addr = &gMulticastV4Addr;
|
||||
}
|
||||
struct netif *netif = ip_current_input_netif();
|
||||
err = udp_sendto_if(gMDNS_pcb, p, dest_addr, LWIP_IANA_PORT_MDNS, netif);
|
||||
if (err == ERR_OK) {
|
||||
#ifdef qDebugLog
|
||||
printf(" - responded with %d bytes err %d\n", nBytes, err);
|
||||
#endif
|
||||
} else
|
||||
printf(">>> mdns_send failed %d\n",err);
|
||||
printf(">>> mdns_send failed %d\n", err);
|
||||
pbuf_free(p);
|
||||
} else
|
||||
printf(">>> mdns_send: alloc failed[%d]\n",nBytes);
|
||||
} else {
|
||||
printf(">>> mdns_send: alloc failed[%d]\n", nBytes);
|
||||
}
|
||||
}
|
||||
|
||||
static void mdns_reply(struct mdns_hdr* hdrP)
|
||||
|
||||
// Message has passed tests, may want to send an answer
|
||||
static void mdns_reply(const ip_addr_t *addr, struct mdns_hdr* hdrP)
|
||||
{
|
||||
int i, nquestions, respLen;
|
||||
struct mdns_hdr* rHdr;
|
||||
|
@ -611,9 +651,9 @@ static void mdns_reply(struct mdns_hdr* hdrP)
|
|||
u8_t* qp;
|
||||
u8_t* mdns_response;
|
||||
|
||||
mdns_response = malloc(DNS_MSG_SIZE);
|
||||
if (mdns_response==NULL) {
|
||||
printf(">>> mdns_reply could not alloc %d\n",DNS_MSG_SIZE);
|
||||
mdns_response = malloc(MDNS_RESPONDER_REPLY_SIZE);
|
||||
if (mdns_response == NULL) {
|
||||
printf(">>> mdns_reply could not alloc %d\n", MDNS_RESPONDER_REPLY_SIZE);
|
||||
return;
|
||||
}
|
||||
|
||||
|
@ -632,25 +672,63 @@ static void mdns_reply(struct mdns_hdr* hdrP)
|
|||
qp = qBase + SIZEOF_DNS_HDR;
|
||||
nquestions = htons(hdrP->numquestions);
|
||||
|
||||
for (i=0; i<nquestions; i++) {
|
||||
for (i = 0; i < nquestions; i++) {
|
||||
char qStr[kMaxQStr];
|
||||
u16_t qClass, qType;
|
||||
u8_t qUnicast;
|
||||
mdns_rsrc* rsrcP;
|
||||
|
||||
qp = mdns_get_question(qBase, qp, qStr, &qClass, &qType, &qUnicast);
|
||||
if (qClass==DNS_RRCLASS_IN || qClass==DNS_RRCLASS_ANY) {
|
||||
if (qClass == DNS_RRCLASS_IN || qClass == DNS_RRCLASS_ANY) {
|
||||
rsrcP = mdns_match(qStr, qType);
|
||||
if (rsrcP) {
|
||||
respLen = mdns_add_to_answer(rsrcP, mdns_response, respLen);
|
||||
rHdr->numanswers = htons( htons(rHdr->numanswers) + 1 );
|
||||
#if LWIP_IPV6
|
||||
if (rsrcP->rType == DNS_RRTYPE_AAAA) {
|
||||
// Emit an answer for each ipv6 address.
|
||||
struct netif *netif = ip_current_input_netif();
|
||||
for (int i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
|
||||
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i))) {
|
||||
const ip6_addr_t *addr6 = netif_ip6_addr(netif, i);
|
||||
#ifdef qDebugLog
|
||||
char addr6_str[IP6ADDR_STRLEN_MAX];
|
||||
ip6addr_ntoa_r(addr6, addr6_str, IP6ADDR_STRLEN_MAX);
|
||||
printf("Updating AAAA record for '%s' to %s\n", rsrcP->rData, addr6_str);
|
||||
#endif
|
||||
memcpy(&rsrcP->rData[rsrcP->rKeySize], addr6, sizeof(addr6->addr));
|
||||
size_t new_len = mdns_add_to_answer(rsrcP, mdns_response, respLen);
|
||||
if (new_len > respLen) {
|
||||
rHdr->numanswers = htons(htons(rHdr->numanswers) + 1);
|
||||
respLen = new_len;
|
||||
}
|
||||
}
|
||||
}
|
||||
continue;
|
||||
}
|
||||
#endif
|
||||
|
||||
if (rsrcP->rType == DNS_RRTYPE_A) {
|
||||
struct netif *netif = ip_current_input_netif();
|
||||
#ifdef qDebugLog
|
||||
char addr4_str[IP4ADDR_STRLEN_MAX];
|
||||
ip4addr_ntoa_r(netif_ip4_addr(netif), addr4_str, IP4ADDR_STRLEN_MAX);
|
||||
printf("Updating A record for '%s' to %s\n", rsrcP->rData, addr4_str);
|
||||
#endif
|
||||
memcpy(&rsrcP->rData[rsrcP->rKeySize], netif_ip4_addr(netif), sizeof(ip4_addr_t));
|
||||
}
|
||||
|
||||
size_t new_len = mdns_add_to_answer(rsrcP, mdns_response, respLen);
|
||||
if (new_len > respLen) {
|
||||
rHdr->numanswers = htons(htons(rHdr->numanswers) + 1);
|
||||
respLen = new_len;
|
||||
}
|
||||
|
||||
// Extra RR logic: if SRV follows PTR, or A follows SRV, volunteer it in extraRR
|
||||
// Not required, but could do more here, see RFC6763 s12
|
||||
if (qType==DNS_RRTYPE_PTR) {
|
||||
if (rsrcP->rNext && rsrcP->rNext->rType==DNS_RRTYPE_SRV)
|
||||
if (qType == DNS_RRTYPE_PTR) {
|
||||
if (rsrcP->rNext && rsrcP->rNext->rType == DNS_RRTYPE_SRV)
|
||||
extra = rsrcP->rNext;
|
||||
} else if (qType==DNS_RRTYPE_SRV) {
|
||||
if (rsrcP->rNext && rsrcP->rNext->rType==DNS_RRTYPE_A)
|
||||
} else if (qType == DNS_RRTYPE_SRV) {
|
||||
if (rsrcP->rNext && rsrcP->rNext->rType == DNS_RRTYPE_A)
|
||||
extra = rsrcP->rNext;
|
||||
}
|
||||
}
|
||||
|
@ -659,16 +737,29 @@ static void mdns_reply(struct mdns_hdr* hdrP)
|
|||
|
||||
if (respLen > SIZEOF_DNS_HDR) {
|
||||
if (extra) {
|
||||
respLen = mdns_add_to_answer(extra, mdns_response, respLen);
|
||||
rHdr->numextrarr = htons( htons(rHdr->numextrarr) + 1 );
|
||||
if (extra->rType == DNS_RRTYPE_A) {
|
||||
struct netif *netif = ip_current_input_netif();
|
||||
#ifdef qDebugLog
|
||||
char addr4_str[IP4ADDR_STRLEN_MAX];
|
||||
ip4addr_ntoa_r(netif_ip4_addr(netif), addr4_str, IP4ADDR_STRLEN_MAX);
|
||||
printf("Updating A record for '%s' to %s\n", extra->rData, addr4_str);
|
||||
#endif
|
||||
memcpy(&extra->rData[extra->rKeySize], netif_ip4_addr(netif), sizeof(ip4_addr_t));
|
||||
}
|
||||
size_t new_len = mdns_add_to_answer(extra, mdns_response, respLen);
|
||||
if (new_len > respLen) {
|
||||
rHdr->numextrarr = htons(htons(rHdr->numextrarr) + 1);
|
||||
respLen = new_len;
|
||||
}
|
||||
}
|
||||
mdns_send_mcast(mdns_response, respLen);
|
||||
mdns_send_mcast(addr, mdns_response, respLen);
|
||||
}
|
||||
|
||||
free(mdns_response);
|
||||
}
|
||||
|
||||
static void mdns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
|
||||
// Callback from udp_recv
|
||||
static void mdns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
|
||||
{
|
||||
UNUSED_ARG(pcb);
|
||||
UNUSED_ARG(port);
|
||||
|
@ -676,30 +767,32 @@ static void mdns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t
|
|||
u8_t* mdns_payload;
|
||||
int plen;
|
||||
|
||||
// Sanity checks on size
|
||||
plen = p->tot_len;
|
||||
if (plen > DNS_MSG_SIZE) {
|
||||
#ifdef qLogIncoming
|
||||
char addr_str[IPADDR_STRLEN_MAX];
|
||||
ipaddr_ntoa_r(addr, addr_str, IPADDR_STRLEN_MAX);
|
||||
printf("\n\nmDNS IPv%d got %d bytes from %s\n", IP_IS_V6(addr) ? 6 : 4, plen, addr_str);
|
||||
#endif
|
||||
|
||||
// Sanity checks on size
|
||||
if (plen > MDNS_RESPONDER_REPLY_SIZE) {
|
||||
printf(">>> mdns_recv: pbuf too big\n");
|
||||
} else if (plen < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY + 1 + SIZEOF_DNS_ANSWER + 1)) {
|
||||
printf(">>> mdns_recv: pbuf too small\n");
|
||||
} else {
|
||||
#ifdef qLogIncoming
|
||||
printf("\n\nmDNS got %d bytes from %d.%d.%d.%d\n",plen, ip4_addr1(addr), ip4_addr2(addr), ip4_addr3(addr), ip4_addr4(addr));
|
||||
#endif
|
||||
mdns_payload = malloc(plen);
|
||||
if (!mdns_payload)
|
||||
if (!mdns_payload) {
|
||||
printf(">>> mdns_recv, could not alloc %d\n",plen);
|
||||
else {
|
||||
} else {
|
||||
if (pbuf_copy_partial(p, mdns_payload, plen, 0) == plen) {
|
||||
struct mdns_hdr* hdrP = (struct mdns_hdr*) mdns_payload;
|
||||
|
||||
#ifdef qLogAllTraffic
|
||||
mdns_print_msg(mdns_payload, plen);
|
||||
#endif
|
||||
#ifdef qLogAllTraffic
|
||||
mdns_print_msg(mdns_payload, plen);
|
||||
#endif
|
||||
|
||||
if ( (hdrP->flags1 & (DNS_FLAG1_RESP + DNS_FLAG1_OPMASK + DNS_FLAG1_TRUNC) ) == 0
|
||||
&& hdrP->numquestions > 0 )
|
||||
mdns_reply(hdrP);
|
||||
mdns_reply(addr, hdrP);
|
||||
}
|
||||
free(mdns_payload);
|
||||
}
|
||||
|
@ -707,92 +800,82 @@ static void mdns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t
|
|||
pbuf_free(p);
|
||||
}
|
||||
|
||||
static void mdns_start()
|
||||
// If we are in station mode and have an IP address, start a multicast UDP receive
|
||||
void mdns_init()
|
||||
{
|
||||
struct ip_info ipInfo;
|
||||
err_t err;
|
||||
|
||||
if (sdk_wifi_get_opmode() != STATION_MODE) {
|
||||
printf(">>> mDNS_start: wifi opmode not station\n");
|
||||
return;
|
||||
}
|
||||
struct netif *station_netif = sdk_system_get_netif(STATION_IF);
|
||||
|
||||
if (!sdk_wifi_get_ip_info(STATION_IF,&ipInfo)) {
|
||||
printf(">>> mDNS_start: no IP addr\n");
|
||||
return;
|
||||
}
|
||||
|
||||
mdns_update_ipaddr(&ipInfo);
|
||||
|
||||
// Start IGMP on the netif for our interface: this isn't done for us
|
||||
struct netif* nfp = netif_list;
|
||||
while (nfp!=NULL) {
|
||||
if ( ip_addr_cmp(&ipInfo.ip, &(nfp->ip_addr)) ) {
|
||||
if (!(nfp->flags & NETIF_FLAG_IGMP)) {
|
||||
nfp->flags |= NETIF_FLAG_IGMP;
|
||||
err = igmp_start(nfp);
|
||||
if (err != ERR_OK) {
|
||||
printf(">>> mDNS_start: igmp_start on %c%c failed %d\n",nfp->name[0], nfp->name[1],err);
|
||||
return;
|
||||
}
|
||||
}
|
||||
if (station_netif) {
|
||||
// Start IGMP on the netif for our interface: this isn't done for us
|
||||
if (!(station_netif->flags & NETIF_FLAG_IGMP)) {
|
||||
station_netif->flags |= NETIF_FLAG_IGMP;
|
||||
err = igmp_start(station_netif);
|
||||
if (err != ERR_OK) {
|
||||
printf(">>> mDNS_init: igmp_start on %c%c failed %d\n", station_netif->name[0], station_netif->name[1],err);
|
||||
return;
|
||||
}
|
||||
}
|
||||
nfp = nfp->next;
|
||||
|
||||
if ((err = igmp_joingroup_netif(station_netif, ip_2_ip4(&gMulticastV4Addr))) != ERR_OK) {
|
||||
printf(">>> mDNS_init: igmp_join failed %d\n",err);
|
||||
return;
|
||||
}
|
||||
|
||||
#if LWIP_IPV6
|
||||
if ((err = mld6_joingroup_netif(station_netif, ip_2_ip6(&gMulticastV6Addr))) != ERR_OK) {
|
||||
printf(">>> mDNS_init: igmp_join failed %d\n",err);
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
gMDNS_pcb = udp_new();
|
||||
struct netif *softap_netif = sdk_system_get_netif(SOFTAP_IF);
|
||||
if (softap_netif) {
|
||||
if (softap_netif == NULL) {
|
||||
printf(">>> mDNS_init: wifi opmode not softap\n");
|
||||
return;
|
||||
}
|
||||
|
||||
// Start IGMP on the netif for our interface: this isn't done for us
|
||||
if (!(softap_netif->flags & NETIF_FLAG_IGMP)) {
|
||||
softap_netif->flags |= NETIF_FLAG_IGMP;
|
||||
err = igmp_start(softap_netif);
|
||||
if (err != ERR_OK) {
|
||||
printf(">>> mDNS_init: igmp_start on %c%c failed %d\n", softap_netif->name[0], softap_netif->name[1],err);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
if ((err = igmp_joingroup_netif(softap_netif, ip_2_ip4(&gMulticastV4Addr))) != ERR_OK) {
|
||||
printf(">>> mDNS_init: igmp_join failed %d\n",err);
|
||||
return;
|
||||
}
|
||||
|
||||
#if LWIP_IPV6
|
||||
if ((err = mld6_joingroup_netif(softap_netif, ip_2_ip6(&gMulticastV6Addr))) != ERR_OK) {
|
||||
printf(">>> mDNS_init: igmp_join failed %d\n",err);
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
if (station_netif == NULL && softap_netif == NULL) {
|
||||
printf(">>> mDNS_init: wifi opmode none\n");
|
||||
return;
|
||||
}
|
||||
|
||||
gMDNS_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
|
||||
if (!gMDNS_pcb) {
|
||||
printf(">>> mDNS_start: udp_new failed\n");
|
||||
printf(">>> mDNS_init: udp_new failed\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if ((err=igmp_joingroup(&ipInfo.ip, &gMulticastAddr)) != ERR_OK) {
|
||||
printf(">>> mDNS_start: igmp_join failed %d\n",err);
|
||||
return;
|
||||
}
|
||||
|
||||
if ((err=udp_bind(gMDNS_pcb, IP_ADDR_ANY, DNS_MDNS_PORT)) != ERR_OK) {
|
||||
printf(">>> mDNS_start: udp_bind failed %d\n",err);
|
||||
if ((err = udp_bind(gMDNS_pcb, IP_ANY_TYPE, LWIP_IANA_PORT_MDNS)) != ERR_OK) {
|
||||
printf(">>> mDNS_init: udp_bind failed %d\n",err);
|
||||
return;
|
||||
}
|
||||
|
||||
udp_recv(gMDNS_pcb, mdns_recv, NULL);
|
||||
}
|
||||
|
||||
static void mdns_close()
|
||||
{
|
||||
udp_remove(gMDNS_pcb);
|
||||
gMDNS_pcb = NULL;
|
||||
#ifdef qDebugLog
|
||||
printf("Closing mDNS\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
static void mdns_task(void *pvParameters)
|
||||
{
|
||||
uint8_t hasIP = 0;
|
||||
uint8_t status;
|
||||
UNUSED_ARG(pvParameters);
|
||||
|
||||
ipaddr_aton(DNS_MULTICAST_ADDRESS, &gMulticastAddr);
|
||||
// Wait until we have joined AP and are assigned an IP
|
||||
while (1) {
|
||||
status = (sdk_wifi_station_get_connect_status() == STATION_GOT_IP);
|
||||
if (status != hasIP) {
|
||||
if (status) mdns_start();
|
||||
else mdns_close();
|
||||
hasIP = status;
|
||||
}
|
||||
vTaskDelayMs(status ? 1000 : 100);
|
||||
}
|
||||
}
|
||||
|
||||
void mdns_init()
|
||||
{
|
||||
#if LWIP_IGMP
|
||||
xTaskCreate(mdns_task, "MDNS", kMDNSStackSize, NULL, 2, NULL);
|
||||
#else
|
||||
#error "LWIP_IGMP needs to be defined in lwipopts.h"
|
||||
#endif
|
||||
}
|
||||
|
|
|
@ -1,20 +1,25 @@
|
|||
#ifndef __MDNSRESPONDER_H__
|
||||
#define __MDNSRESPONDER_H__
|
||||
|
||||
#include <lwip/ip_addr.h>
|
||||
|
||||
/*
|
||||
* Basic multicast DNS responder
|
||||
*
|
||||
* Advertises the IP address, port, and characteristics of a service to other devices using multicast DNS on the same LAN,
|
||||
* so they can find devices with addresses dynamically allocated by DHCP. See avahi, Bonjour, etc
|
||||
* See RFC6762, RFC6763
|
||||
* Advertises the IP address, port, and characteristics of a service to other
|
||||
* devices using multicast DNS on the same LAN, so they can find devices with
|
||||
* addresses dynamically allocated by DHCP. See avahi, Bonjour, etc See RFC6762,
|
||||
* RFC6763
|
||||
*
|
||||
* This sample code is in the public domain.
|
||||
*
|
||||
* by M J A Hamel 2016
|
||||
*/
|
||||
|
||||
#ifndef __MDNSRESPONDER_H__
|
||||
#define __MDNSRESPONDER_H__
|
||||
|
||||
#include <lwip/ip_addr.h>
|
||||
|
||||
/* The default maximum reply size, increase as necessary. */
|
||||
#ifndef MDNS_RESPONDER_REPLY_SIZE
|
||||
#define MDNS_RESPONDER_REPLY_SIZE 320
|
||||
#endif
|
||||
|
||||
// Starts the mDNS responder task, call first
|
||||
void mdns_init();
|
||||
|
@ -42,7 +47,10 @@ void mdns_add_facility( const char* instanceName, // Short user-friendly insta
|
|||
void mdns_add_PTR(const char* rKey, u32_t ttl, const char* nameStr);
|
||||
void mdns_add_SRV(const char* rKey, u32_t ttl, u16_t rPort, const char* targname);
|
||||
void mdns_add_TXT(const char* rKey, u32_t ttl, const char* txtStr);
|
||||
void mdns_add_A (const char* rKey, u32_t ttl, ip_addr_t addr);
|
||||
void mdns_add_A (const char* rKey, u32_t ttl, const ip4_addr_t *addr);
|
||||
#if LWIP_IPV6
|
||||
void mdns_add_AAAA(const char* rKey, u32_t ttl, const ip6_addr_t *addr);
|
||||
#endif
|
||||
|
||||
/* Sample usage, advertising a secure web service
|
||||
|
||||
|
|
Loading…
Reference in a new issue