net-dns/djbdns/files/srv_record_support.patch

From: Michael Handler <handler@sub-rosa.com>
To: dns@list.cr.yp.to
Subject: tinydns-data SRV & axfr-get SRV/PTR patches
Date: Thu, 14 Sep 2000 20:37:50 -0400

Here's a combined patch that:

a) adds a native SRV type to tinydns-data

Sfqdn:ip:x:port:weight:priority:ttl:timestamp

Standard rules for ip, x, ttl, and timestamp apply. Port, weight, and
priority all range from 0-65535. Weight and priority are optional; they
default to zero if not provided.

Sconsole.zoinks.example.com:1.2.3.4:rack102-con1:2001:69:7:300:

b) makes axfr-get decompose SRV and PTR records and write them out in
native format, rather than opaque. Again, this is necessary because if the
DNAME fields in the records reference the same zone as fqdn, they can have
compression pointers that are bogus outside the context of that specific
packet, and which can't be correctly loaded into data.cdb by tinydns-data.

--michael

Laurent G. Bercot <ska-djbdns@skarnet.org> updated it for
djbdns-1.05. Documentation patch by Alex Efros.

diff -rNU3 djbdns-1.05/axfr-get.c djbdns-1.05-srv/axfr-get.c
--- djbdns-1.05/axfr-get.c	Sun Feb 11 22:11:45 2001
+++ djbdns-1.05/axfr-get.c	Thu Oct 18 14:46:56 2001
@@ -209,6 +209,26 @@
     if (!stralloc_cats(&line,".:")) return 0;
     if (!stralloc_catulong0(&line,dist,0)) return 0;
   }
+  else if (byte_equal(data,2,DNS_T_SRV)) {
+    uint16 dist, weight, port;
+    if (!stralloc_copys(&line,"S")) return 0;
+    if (!dns_domain_todot_cat(&line,d1)) return 0;
+    if (!stralloc_cats(&line,"::")) return 0;
+    pos = x_copy(buf,len,pos,data,2);
+    uint16_unpack_big(data,&dist);
+    pos = x_copy(buf,len,pos,data,2);
+    uint16_unpack_big(data,&weight);
+    pos = x_copy(buf,len,pos,data,2);
+    uint16_unpack_big(data,&port);
+    x_getname(buf,len,pos,&d1);
+    if (!dns_domain_todot_cat(&line,d1)) return 0;
+    if (!stralloc_cats(&line,".:")) return 0;
+    if (!stralloc_catulong0(&line,dist,0)) return 0;
+    if (!stralloc_cats(&line,":")) return 0;
+    if (!stralloc_catulong0(&line,weight,0)) return 0;
+    if (!stralloc_cats(&line,":")) return 0;
+    if (!stralloc_catulong0(&line,port,0)) return 0;
+  }
   else if (byte_equal(data,2,DNS_T_A) && (dlen == 4)) {
     char ipstr[IP4_FMT];
     if (!stralloc_copys(&line,"+")) return 0;
@@ -216,6 +236,14 @@
     if (!stralloc_cats(&line,":")) return 0;
     x_copy(buf,len,pos,data,4);
     if (!stralloc_catb(&line,ipstr,ip4_fmt(ipstr,data))) return 0;
+  }
+  else if (byte_equal(data,2,DNS_T_PTR)) {
+    if (!stralloc_copys(&line,"^")) return 0;
+    if (!dns_domain_todot_cat(&line,d1)) return 0;
+    if (!stralloc_cats(&line,":")) return 0;
+    x_getname(buf,len,pos,&d1);
+    if (!dns_domain_todot_cat(&line,d1)) return 0;
+    if (!stralloc_cats(&line,".")) return 0;
   }
   else {
     unsigned char ch;
diff -rNU3 djbdns-1.05/dns.h djbdns-1.05-srv/dns.h
--- djbdns-1.05/dns.h	Sun Feb 11 22:11:45 2001
+++ djbdns-1.05/dns.h	Thu Oct 18 14:46:56 2001
@@ -20,6 +20,7 @@
 #define DNS_T_SIG "\0\30"
 #define DNS_T_KEY "\0\31"
 #define DNS_T_AAAA "\0\34"
+#define DNS_T_SRV "\0\41"
 #define DNS_T_AXFR "\0\374"
 #define DNS_T_ANY "\0\377"
 
diff -rNU3 djbdns-1.05/tinydns-data.c djbdns-1.05-srv/tinydns-data.c
--- djbdns-1.05/tinydns-data.c	Sun Feb 11 22:11:45 2001
+++ djbdns-1.05/tinydns-data.c	Thu Oct 18 14:50:53 2001
@@ -196,6 +196,7 @@
   char type[2];
   char soa[20];
   char buf[4];
+  char srv[6];
 
   umask(022);
 
@@ -360,6 +361,43 @@
 	rr_start(DNS_T_MX,ttl,ttd,loc);
 	uint16_pack_big(buf,u);
 	rr_add(buf,2);
+	rr_addname(d2);
+	rr_finish(d1);
+
+	if (ip4_scan(f[1].s,ip)) {
+	  rr_start(DNS_T_A,ttl,ttd,loc);
+	  rr_add(ip,4);
+	  rr_finish(d2);
+	}
+	break;
+	
+      case 'S':
+	if (!dns_domain_fromdot(&d1,f[0].s,f[0].len)) nomem();
+	if (!stralloc_0(&f[6])) nomem();
+	if (!scan_ulong(f[6].s,&ttl)) ttl = TTL_POSITIVE;
+	ttdparse(&f[7],ttd);
+	locparse(&f[8],loc);
+
+	if (!stralloc_0(&f[1])) nomem();
+
+	if (byte_chr(f[2].s,f[2].len,'.') >= f[2].len) {
+	  if (!stralloc_cats(&f[2],".srv.")) nomem();
+	  if (!stralloc_catb(&f[2],f[0].s,f[0].len)) nomem();
+	}
+	if (!dns_domain_fromdot(&d2,f[2].s,f[2].len)) nomem();
+
+	if (!stralloc_0(&f[4])) nomem();
+	if (!scan_ulong(f[4].s,&u)) u = 0;
+	uint16_pack_big(srv,u);
+	if (!stralloc_0(&f[5])) nomem();
+	if (!scan_ulong(f[5].s,&u)) u = 0;
+	uint16_pack_big(srv + 2,u);
+	if (!stralloc_0(&f[3])) nomem();
+	if (!scan_ulong(f[3].s,&u)) nomem();
+	uint16_pack_big(srv + 4,u);
+
+	rr_start(DNS_T_SRV,ttl,ttd,loc);
+	rr_add(srv,6);
 	rr_addname(d2);
 	rr_finish(d1);
 
--- djbdns-1.05/man/tinydns-data.8	2003-10-23 10:47:32.000000000 +0300
+++ djbdns-1.05/man/tinydns-data.8	2014-09-26 02:51:59.861716505 +0300
@@ -487,6 +487,38 @@
 .RI \ 072
 is a colon.
 
+.RI S fqdn\fR:\fIip\fR:\fIx\fR:\fIport\fR:\fIweight\fR:\fIpriority\fR:\fIttl\fR:\fItimestamp\fR:\fIlo\fR
+
+SRV record for
+.IR fqdn .
+
+.B tinydns-data
+creates
+.IP
+an SRV record
+showing 
+.IR x\fR.srv.\fIfqdn\fR:\fIport\fR
+as a service for 
+.IR fqdn
+with given \fIweight\fR and \fIpriority\fR
+(\fIport\fR, \fIweight\fR and \fIpriority\fR must be in range 0-65535;
+\fIweight\fR and \fIpriority\fR are optional;
+they default to zero if not provided)
+and
+.P
+.IP
+an A record showing
+.I ip
+as the IP address
+of
+.IR x\fR.srv.\fIfqdn .
+.P
+
+If
+.I x
+contains a dot
+then it is treated specially; see above.
+
 .RI ^ fqdn\fR:\fIp\fR:\fIttl\fR:\fItimestamp\fR:\fIlo\fR
 
 PTR record for