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Handle trans id >= 0x8000, fix bug #37

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This commit is contained in:
Erik Ekman 2009-01-03 20:13:31 +00:00 committed by Erik Ekman
parent 09c904f0c1
commit 62824e92ed
3 changed files with 30 additions and 3 deletions
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4
src/common.h
View File

@ -50,8 +50,8 @@ struct packet
struct query { struct query {
char name[QUERY_NAME_SIZE]; char name[QUERY_NAME_SIZE];
short type; unsigned short type;
short id; unsigned short id;
struct in_addr destination; struct in_addr destination;
struct sockaddr from; struct sockaddr from;
int fromlen; int fromlen;

1
src/dns.c
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@ -222,6 +222,7 @@ dns_decode(char *buf, size_t buflen, struct query *q, qr_t qr, char *packet, siz
ancount = ntohs(header->ancount); ancount = ntohs(header->ancount);
id = ntohs(header->id); id = ntohs(header->id);
id = id & 0xFFFF; /* Kill any sign extension */
rlen = 0; rlen = 0;

28
tests/dns.c
View File

@ -48,6 +48,13 @@ static char answerPacket[] =
"\x69\x73\x20\x74\x68\x65\x20\x6D\x65\x73\x73\x61\x67\x65\x20\x74\x6F" "\x69\x73\x20\x74\x68\x65\x20\x6D\x65\x73\x73\x61\x67\x65\x20\x74\x6F"
"\x20\x62\x65\x20\x64\x65\x6C\x69\x76\x65\x72\x65\x64"; "\x20\x62\x65\x20\x64\x65\x6C\x69\x76\x65\x72\x65\x64";
static char answerPacketHighTransId[] =
"\x85\x39\x84\x00\x00\x01\x00\x01\x00\x00\x00\x00\x05\x73\x69\x6C\x6C"
"\x79\x04\x68\x6F\x73\x74\x02\x6F\x66\x06\x69\x6F\x64\x69\x6E\x65\x04"
"\x63\x6F\x64\x65\x04\x6B\x72\x79\x6F\x02\x73\x65\x00\x00\x0A\x00\x01"
"\xC0\x0C\x00\x0A\x00\x01\x00\x00\x00\x00\x00\x23\x74\x68\x69\x73\x20"
"\x69\x73\x20\x74\x68\x65\x20\x6D\x65\x73\x73\x61\x67\x65\x20\x74\x6F"
"\x20\x62\x65\x20\x64\x65\x6C\x69\x76\x65\x72\x65\x64";
static char *msgData = "this is the message to be delivered"; static char *msgData = "this is the message to be delivered";
static char *topdomain = "kryo.se"; static char *topdomain = "kryo.se";
@ -142,18 +149,36 @@ END_TEST
START_TEST(test_decode_response) START_TEST(test_decode_response)
{ {
char buf[512]; char buf[512];
struct query q;
int len; int len;
int ret; int ret;
len = sizeof(buf); len = sizeof(buf);
memset(&buf, 0, sizeof(buf)); memset(&buf, 0, sizeof(buf));
ret = dns_decode(buf, len, NULL, QR_ANSWER, answerPacket, sizeof(answerPacket)-1); ret = dns_decode(buf, len, &q, QR_ANSWER, answerPacket, sizeof(answerPacket)-1);
fail_unless(strncmp(msgData, buf, sizeof(msgData)) == 0, "Did not extract expected data"); fail_unless(strncmp(msgData, buf, sizeof(msgData)) == 0, "Did not extract expected data");
fail_unless(ret == strlen(msgData), "Bad data length: %d, expected %d", ret, strlen(msgData)); fail_unless(ret == strlen(msgData), "Bad data length: %d, expected %d", ret, strlen(msgData));
fail_unless(q.id == 0x0539);
} }
END_TEST END_TEST
START_TEST(test_decode_response_with_high_trans_id)
{
char buf[512];
struct query q;
int len;
int ret;
len = sizeof(buf);
memset(&buf, 0, sizeof(buf));
ret = dns_decode(buf, len, &q, QR_ANSWER, answerPacketHighTransId, sizeof(answerPacketHighTransId)-1);
fail_unless(strncmp(msgData, buf, sizeof(msgData)) == 0, "Did not extract expected data");
fail_unless(ret == strlen(msgData), "Bad data length: %d, expected %d", ret, strlen(msgData));
fail_unless(q.id == 0x8539, "q.id was %08X instead of %08X!", q.id, 0x8539);
}
END_TEST
static void static void
dump_packet(char *buf, size_t len) dump_packet(char *buf, size_t len)
{ {
@ -183,6 +208,7 @@ test_dns_create_tests()
tcase_add_test(tc, test_decode_query); tcase_add_test(tc, test_decode_query);
tcase_add_test(tc, test_encode_response); tcase_add_test(tc, test_encode_response);
tcase_add_test(tc, test_decode_response); tcase_add_test(tc, test_decode_response);
tcase_add_test(tc, test_decode_response_with_high_trans_id);
return tc; return tc;
} }