Tweaks to previous, DNS label charset commit.

src/dns-protocol.h

@@ -144,5 +144,9 @@ struct dns_header {
   (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
 
 /* Escape character in our presentation format for names.
-   Cannot be '.' or /000 and must be !isprint() */
+   Cannot be '.' or /000 and must be !isprint().
+   Note that escaped chars are stored as
+   <NAME_ESCAPE> <orig-char+1>
+   to ensure that the escaped form of /000 doesn't include /000
+*/
 #define NAME_ESCAPE 1

src/dnssec.c

@@ -341,9 +341,11 @@ static int to_wire(char *name)
 	if (*p >= 'A' && *p <= 'Z')
 	  *p = *p - 'A' + 'a';
 	else if (*p == NAME_ESCAPE)
+	  {
 	    for (q = p; *q; q++)
 	      *q = *(q+1);
-	       
+	    (*p)--;
+	  }
       term = *p;
       
       if ((len = p - l) != 0)
@@ -377,6 +379,7 @@ static void from_wire(char *name)
 	    memmove(p+1, p, 1 + last - p);
 	    len++;
 	    *p++ = NAME_ESCAPE; 
+	    (*p)++;
 	  }
 	
       l[len] = '.';

src/rfc1035.c

@@ -20,7 +20,7 @@ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
 		 char *name, int isExtract, int extrabytes)
 {
   unsigned char *cp = (unsigned char *)name, *p = *pp, *p1 = NULL;
-  unsigned int j, l, hops = 0;
+  unsigned int j, l, namelen = 0, hops = 0;
   int retvalue = 1;
   
   if (isExtract)
@@ -94,9 +94,15 @@ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
 	    count = 256;
 	  digs = ((count-1)>>2)+1;
 	  
-	  /* output is \[x<hex>/siz]. which is digs+9 chars */
-	  if (cp - (unsigned char *)name + digs + 9 >= MAXDNAME)
+	  /* output is \[x<hex>/siz]. which is digs+6/7/8 chars */
+	  namelen += digs+6;
+	  if (count > 9)
+	    namelen++;
+	  if (count > 99)
+	    namelen++;
+	  if (namelen+1 >= MAXDNAME)
 	    return 0;
+
 	  if (!CHECK_LEN(header, p, plen, (count-1)>>3))
 	    return 0;
 
@@ -119,7 +125,8 @@ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
 	}
       else 
 	{ /* label_type = 0 -> label. */
-	  if (cp - (unsigned char *)name + l + 1 >= MAXDNAME)
+	  namelen += l;
+	  if (namelen+1 >= MAXDNAME)
 	    return 0;
 	  if (!CHECK_LEN(header, p, plen, l))
 	    return 0;
@@ -132,7 +139,11 @@ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
 		if (option_bool(OPT_DNSSEC_VALID))
 		  {
 		    if (c == 0 || c == '.' || c == NAME_ESCAPE)
+		      {
 			*cp++ = NAME_ESCAPE;
+			*cp++ = c+1;
+		      }
+		    else
 		      *cp++ = c; 
 		  }
 		else
@@ -155,7 +166,7 @@ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
 		      c1 += 'a' - 'A';
 #ifdef HAVE_DNSSEC
 		    if (option_bool(OPT_DNSSEC_VALID) && c1 == NAME_ESCAPE)
-		      c1 = *cp++;
+		      c1 = (*cp++)-1;
 #endif
 		    
 		    if (c2 >= 'A' && c2 <= 'Z')

src/util.c

@@ -229,7 +229,7 @@ unsigned char *do_rfc1035_name(unsigned char *p, char *sval)
 	{
 #ifdef HAVE_DNSSEC
 	  if (option_bool(OPT_DNSSEC_VALID) && *sval == NAME_ESCAPE)
-	    *p++ = *(++sval);
+	    *p++ = (*(++sval))-1;
 	  else
 #endif		
 	    *p++ = *sval;