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Native the maximum domain name length is 255 octets

Browse source 
http://tools.ietf.org/html/rfc3986#page-21
This commit is contained in:
M66B 2016-02-14 11:54:06 +01:00
parent dc0980e87f
commit 87b3d0c33c
2 changed files with 5 additions and 7 deletions
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10
app/src/main/jni/netguard/dns.c
View file

@ -26,9 +26,7 @@ int32_t get_qname(const uint8_t *data, const size_t datalen, uint16_t off, char
uint8_t noff = 0;
uint16_t ptr = off;
uint8_t len = *(data + ptr);
uint8_t parts = 0;
while (len && parts < 10) {
parts++;
while (len) {
if (len & 0xC0) {
ptr = (uint16_t) ((len & 0x3F) * 256 + *(data + ptr + 1));
len = *(data + ptr);
@ -38,7 +36,7 @@ int32_t get_qname(const uint8_t *data, const size_t datalen, uint16_t off, char
off += 2;
}
}
else if (ptr + 1 + len <= datalen) {
else if (ptr + 1 + len <= datalen && noff + len <= DNS_QNAME_MAX) {
memcpy(qname + noff, data + ptr + 1, len);
*(qname + noff + len) = '.';
noff += (len + 1);
@ -52,12 +50,12 @@ int32_t get_qname(const uint8_t *data, const size_t datalen, uint16_t off, char
ptr++;
if (len > 0 || noff == 0) {
log_android(ANDROID_LOG_ERROR, "DNS qname invalid len %d noff %d part %d", len, noff,
parts);
log_android(ANDROID_LOG_ERROR, "DNS qname invalid len %d noff %d", len, noff);
return -1;
}
*(qname + noff - 1) = 0;
log_android(ANDROID_LOG_DEBUG, "qname %s", qname);
return (c ? off : ptr);
}

2
app/src/main/jni/netguard/netguard.h
View file

@ -206,7 +206,7 @@ typedef struct pcaprec_hdr_s {
#define DNS_QTYPE_A 1 // IPv4
#define DNS_QTYPE_AAAA 28 // IPv6
#define DNS_QNAME_MAX 63
#define DNS_QNAME_MAX 255
#define DNS_TTL (10 * 60) // seconds
struct dns_header {