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[dns] Allow trailing dots in DNS names 

Reported-by: Christian Hesse <list@eworm.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/5/head
Michael Brown 2012-01-10 23:25:00 +00:00
parent 55f6c88a27
commit 187cd80106
1 changed files with 15 additions and 9 deletions
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20
src/net/udp/dns.c
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@ -222,18 +222,24 @@ static char * dns_qualify_name ( const char *string ) {
* DNS names consist of "<length>element" pairs. * DNS names consist of "<length>element" pairs.
*/ */
static char * dns_make_name ( const char *string, char *buf ) { static char * dns_make_name ( const char *string, char *buf ) {
char *length_byte = buf++; char *length_byte;
char c; char c;
while ( ( c = *(string++) ) ) { length_byte = buf++;
if ( c == '.' ) { *length_byte = 0;
*length_byte = buf - length_byte - 1; do {
length_byte = buf; c = *(string++);
if ( ( c == '.' ) || ( c == '\0' ) ) {
if ( *length_byte ) {
length_byte = buf++;
*length_byte = 0;
} }
} else {
*(buf++) = c; *(buf++) = c;
(*length_byte)++;
} }
*length_byte = buf - length_byte - 1; } while ( c );
*(buf++) = '\0';
return buf; return buf;
} }