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tests: net: dns: Add test for invalid DNS answer parsing

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Make sure we catch invalid answer during parsing.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
This commit is contained in:
Jukka Rissanen 2024-11-26 17:50:02 +02:00 • committed by Benjamin Cabé
commit 16669ec4d5
1 changed files with 21 additions and 0 deletions
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21
tests/net/lib/dns_packet/src/main.c
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@ -1266,6 +1266,27 @@ ZTEST(dns_packet, test_dns_flags_len)
"DNS message length check failed (%d)", ret); "DNS message length check failed (%d)", ret);
} }
static uint8_t invalid_answer_resp_ipv4[18] = {
/* DNS msg header (12 bytes) */
0x01, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0x00, 0x01,
};
ZTEST(dns_packet, test_dns_invalid_answer)
{
struct dns_msg_t dns_msg = { 0 };
enum dns_rr_type type;
uint32_t ttl;
int ret;
dns_msg.msg = invalid_answer_resp_ipv4;
dns_msg.msg_size = sizeof(invalid_answer_resp_ipv4);
dns_msg.answer_offset = 12;
ret = dns_unpack_answer(&dns_msg, 0, &ttl, &type);
zassert_equal(ret, -EINVAL, "DNS message answer check succeed (%d)", ret);
}
ZTEST_SUITE(dns_packet, NULL, NULL, NULL, NULL, NULL); ZTEST_SUITE(dns_packet, NULL, NULL, NULL, NULL, NULL);
/* TODO: /* TODO:
* 1) add malformed DNS data (mostly done) * 1) add malformed DNS data (mostly done)