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Ensure domain name has at least a single character. hack.

This commit is contained in:
Neel Goyal 2014-02-04 10:39:04 -05:00
parent 4fceebbdcf
commit 3a694c2b02
1 changed files with 9 additions and 2 deletions
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11
src/util-internal.c
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@ -589,6 +589,7 @@ getdns_return_t
validate_dname(const char* dname) {
int len;
int label_len;
int num_chars;
const char* s;
if (dname == NULL) {
return GETDNS_RETURN_INVALID_PARAMETER;
@ -602,6 +603,7 @@ validate_dname(const char* dname) {
return GETDNS_RETURN_GOOD;
}
label_len = 0;
num_chars = 0;
for (s = dname; *s; ++s) {
switch (*s) {
case '.':
@ -613,8 +615,10 @@ validate_dname(const char* dname) {
break;
default:
if ((*s >= 'a' && *s <= 'z') ||
(*s >= 'A' && *s <= 'Z') ||
(*s >= '0' && *s <= '9')) {
(*s >= 'A' && *s <= 'Z')) {
label_len++;
num_chars++;
} else if (*s >= '0' && *s <= '9') {
label_len++;
} else if (*s == '-' && label_len != 0) {
label_len++;
@ -627,6 +631,9 @@ validate_dname(const char* dname) {
if (label_len > GETDNS_MAX_LABEL_LEN) {
return GETDNS_RETURN_BAD_DOMAIN_NAME;
}
if (num_chars == 0) {
return GETDNS_RETURN_BAD_DOMAIN_NAME;
}
return GETDNS_RETURN_GOOD;
}