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Add helper for matching topdomain and getting data length

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This commit is contained in:
Erik Ekman 2021-08-25 00:48:10 +02:00
parent 589027568b
commit f1e7823a3d
3 changed files with 96 additions and 0 deletions
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46
src/common.c
View file

@ -404,6 +404,52 @@ check_topdomain(char *str, int allow_wildcard, char **errormsg)
return 0;
}
int
query_datalen(const char *qname, const char *topdomain)
{
/* Return number of data bytes embedded in DNS query name,
* or -1 if domains do not match.
*/
int qpos = strlen(qname);
int tpos = strlen(topdomain);
if (tpos < 3 || qpos < tpos) {
/* Domain or query name too short */
return -1;
}
/* Backward string compare */
qpos--;
tpos--;
while (qpos >= 0) {
if (topdomain[tpos] == '*') {
/* Wild match, is first in topdomain */
if (qname[qpos] == '*') {
/* Don't match against stars in query name */
return -1;
} else if (qpos == 0 || qname[qpos-1] == '.') {
/* Reached start of query name or chunk separator */
return qpos;
}
qpos--;
} else if (tolower(qname[qpos]) == tolower(topdomain[tpos])) {
/* Matching char, exclude wildcard in query name */
if (tpos == 0) {
/* Fully matched domain */
if (qpos == 0 || qname[qpos-1] == '.') {
/* Start of name or has dot before matching topdomain */
return qpos;
}
/* Query name has longer chunk than topdomain */
return -1;
}
tpos--;
qpos--;
} else {
return -1;
}
}
return -1;
}
#if defined(WINDOWS32) || defined(ANDROID)
#ifndef ANDROID
int

2
src/common.h
View file

@ -128,6 +128,8 @@ void read_password(char*, size_t);
int check_topdomain(char *, int, char **);
int query_datalen(const char *qname, const char *topdomain);
#if defined(WINDOWS32) || defined(ANDROID)
#ifndef ANDROID
int inet_aton(const char *cp, struct in_addr *inp);

48
tests/common.c
View file

@ -143,6 +143,52 @@ START_TEST(test_topdomain_wild)
}
END_TEST
START_TEST(test_query_datalen)
{
char *topdomain = "r.foo.com";
/* With data */
ck_assert(query_datalen("foobar.r.foo.com", topdomain) == 7);
ck_assert(query_datalen("foobar.r.FoO.Com", topdomain) == 7);
ck_assert(query_datalen("foo.bar.r.FoO.Com", topdomain) == 8);
ck_assert(query_datalen(".r.foo.com", topdomain) == 1);
/* Without data */
ck_assert(query_datalen("r.foo.com", topdomain) == 0);
ck_assert(query_datalen("R.foo.com", topdomain) == 0);
/* Shorter query name */
ck_assert(query_datalen("foo.com", topdomain) == -1);
/* Mismatched query name */
ck_assert(query_datalen("b.foo.com", topdomain) == -1);
ck_assert(query_datalen("*.foo.com", topdomain) == -1);
/* Query name overlaps topdomain, but is longer */
ck_assert(query_datalen("bar.foo.com", topdomain) == -1);
}
END_TEST
START_TEST(test_query_datalen_wild)
{
char *topdomain = "*.foo.com";
/* With data */
ck_assert(query_datalen("foobar.a.foo.com", topdomain) == 7);
ck_assert(query_datalen("foobar.r.FoO.Com", topdomain) == 7);
ck_assert(query_datalen("foo.bar.r.FoO.Com", topdomain) == 8);
ck_assert(query_datalen("foo.Ab.foo.cOm", topdomain) == 4);
ck_assert(query_datalen("foo.Abcd.Foo.com", topdomain) == 4);
ck_assert(query_datalen("***.STARs.foo.com", topdomain) == 4);
ck_assert(query_datalen(".a.foo.com", topdomain) == 1);
ck_assert(query_datalen(".ab.foo.com", topdomain) == 1);
/* Without data */
ck_assert(query_datalen("rr.foo.com", topdomain) == 0);
ck_assert(query_datalen("b.foo.com", topdomain) == 0);
ck_assert(query_datalen("B.foo.com", topdomain) == 0);
/* Shorter query name */
ck_assert(query_datalen("foo.com", topdomain) == -1);
/* Wildcard part of query name matching topdomain */
ck_assert(query_datalen("aa.*.foo.com", topdomain) == -1);
/* Mismatched query name */
ck_assert(query_datalen("bar.r.boo.com", topdomain) == -1);
}
END_TEST
START_TEST(test_parse_format_ipv4)
{
char *host = "192.168.2.10";
@ -245,6 +291,8 @@ test_common_create_tests()
tcase_add_test(tc, test_topdomain_length);
tcase_add_test(tc, test_topdomain_chunks);
tcase_add_test(tc, test_topdomain_wild);
tcase_add_test(tc, test_query_datalen);
tcase_add_test(tc, test_query_datalen_wild);
tcase_add_test(tc, test_parse_format_ipv4);
tcase_add_test(tc, test_parse_format_ipv4_listen_all);