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dns_util.h
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dns_util.h
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/**
* Utility functions for DNS
*/
#include "dns.h"
class dns_util {
public:
static int cmp_label_in_name_from_right(const char* a, int num_labels_a, const char* b, int num_labels_b, int right_offset);
static inline const char* skip_to_label(const char* name, int offset_left);
/**
* Counts the number of labels in a Dns name.
*
* @param char* name the dns name to count the label from
* @return int the number of labels in the dns name.
* @note that the root name (".") does not have any labels
*/
static int count_name_labels(const char* name);
/**
* Compares 2 dns labels, the labels must start with the
* length byte
*
* @param char* a the first label to compare
* @param char* b the second label to compare
* @return <0 if a<b, 0 if a==b, >0 if a>b
*/
static inline int cmp_label(const char* a, const char* b);
/**
* Compares the text of the 2 dns labels without taking the case into account.
* The length of both texts must be the same.
*
* Use this function instead of strcmpi because there is a difference between canonical ordering
* and our string is not NULL terminated.
*
* @param const char* a the first label text to compare
* @param const char* b the second label text to compare
* @param int len the length of both labels
* @return <0 if a<b, 0 if a==b, >0 if a>b
*/
static int cmp_label_text(const char* a, const char* b, int len);
/**
* Compares 2 dns labels canonically, the labels must start with the
* length byte
*
* @param char* a the first label to compare
* @param char* b the second label to compare
* @return <0 if a<b, 0 if a==b, >0 if a>b
*/
static inline int cmp_label_canonical(const char* a, const char* b);
/**
* Compares two dns names canonically
*
* @param string char* a the first name to compare
* @param string char* b the second name to compare
* @return -1 if a < b, 0 if a == b, 1 if a > b
*/
static int cmp_names_canonical(const char* a, const char* b);
static bool matches_name(const char* a, const char* b);
static bool matches_label_or_wildcard(const char* a, const char* b);
static bool matches_name_or_wildcard(const char* a, const char* b);
};