Patch enables including subdomain data; it is done by following entry in data:
    Idomain.somewhere:/domain/data.cdb
Now data for domain.somewhere is looked up in /domain/data.cdb (relative to
tinydns root dir, /etc/tinydns/root in default setup).

diff -u djbdns-1.05/tdlookup.c djbdns-1.05-include/tdlookup.c
--- djbdns-1.05/tdlookup.c	Sun Feb 11 22:11:45 2001
+++ djbdns-1.05-include/tdlookup.c	Fri May  7 13:10:14 2004
@@ -42,6 +42,7 @@
 static unsigned int dpos;
 static char type[2];
 static uint32 ttl;
+static char dfile[512];
 
 static int find(char *d,int flagwild)
 {
@@ -134,6 +135,11 @@
       if (r == -1) return 0;
       if (byte_equal(type,2,DNS_T_SOA)) flagauthoritative = 1;
       if (byte_equal(type,2,DNS_T_NS)) flagns = 1;
+      if (byte_equal(type,2,"\0\0")) {
+	      if(dlen-dpos>sizeof(dfile)) return 0;
+	      byte_copy(dfile,dlen-dpos,data+dpos);
+	      return 2;
+      }
     }
     if (flagns) break;
     if (!*control) return 0; /* q is not within our bailiwick */
@@ -282,10 +288,13 @@
 {
   int fd;
   int r;
+  int i;
   char key[6];
 
   tai_now(&now);
-  fd = open_read("data.cdb");
+  byte_copy(dfile,9,"data.cdb\0");
+  for(i=0;i<2;i++) {
+  fd = open_read(dfile);
   if (fd == -1) return 0;
   cdb_init(&c,fd);
 
@@ -306,5 +315,7 @@
 
   cdb_free(&c);
   close(fd);
+  if(r!=2) break;
+  }
   return r;
 }
diff -u djbdns-1.05/tinydns-data.c djbdns-1.05-include/tinydns-data.c
--- djbdns-1.05/tinydns-data.c	Sun Feb 11 22:11:45 2001
+++ djbdns-1.05-include/tinydns-data.c	Fri May  7 13:05:25 2004
@@ -246,7 +246,16 @@
         if (cdb_make_add(&cdb,key.s,key.len,loc,2) == -1)
           die_datatmp();
 	break;
-
+      case 'I':
+	if (!dns_domain_fromdot(&d1,f[0].s,f[0].len)) nomem();
+	if(!stralloc_0(&f[1])) nomem();
+	ttl=0;
+	byte_zero(ttd,8);
+	byte_zero(loc,2);
+	rr_start("\0\0",ttl,ttd,loc);
+	rr_add(f[1].s,f[1].len);
+	rr_finish(d1);
+	break;
       case 'Z':
 	if (!dns_domain_fromdot(&d1,f[0].s,f[0].len)) nomem();