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Add missing EDNS0 section.

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EDNS0 section missing in replies to EDNS0-containing queries where
answer generated from --local=/<domain>/
This commit is contained in:
Simon Kelley
2018-08-03 20:38:18 +01:00
parent dd33e98da0
commit 1682d15a74
2 changed files with 14 additions and 5 deletions
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4
CHANGELOG
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@@ -45,6 +45,10 @@ version 2.80
Fix crash on startup with a --synth-domain which has no prefix.
Introduced in 2.79. Thanks to Andreas Engel for the bug report.
Fix missing EDNS0 section in some replies generated by local
DNS configuration which confused systemd-resolvd. Thanks to
Steve Dodd for characterising the problem.
version 2.79
Fix parsing of CNAME arguments, which are confused by extra spaces.

15
src/forward.c
View File

@@ -246,9 +246,9 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
unsigned int crc = questions_crc(header, plen, daemon->namebuff);
void *hash = &crc;
#endif
unsigned int gotname = extract_request(header, plen, daemon->namebuff, NULL);
(void)do_bit;
unsigned int gotname = extract_request(header, plen, daemon->namebuff, NULL);
unsigned char *oph = find_pseudoheader(header, plen, NULL, NULL, NULL, NULL);
(void)do_bit;
/* may be no servers available. */
if (forward || (hash && (forward = lookup_frec_by_sender(ntohs(header->id), udpaddr, hash))))
@@ -399,7 +399,6 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
struct server *firstsentto = start;
int subnet, forwarded = 0;
size_t edns0_len;
unsigned char *oph = find_pseudoheader(header, plen, NULL, NULL, NULL, NULL);
unsigned char *pheader;
/* If a query is retried, use the log_id for the retry when logging the answer. */
@@ -554,6 +553,8 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
if (udpfd != -1)
{
plen = setup_reply(header, plen, addrp, flags, daemon->local_ttl);
if (oph)
plen = add_pseudoheader(header, plen, ((unsigned char *) header) + PACKETSZ, daemon->edns_pktsz, 0, NULL, 0, do_bit, 0);
send_from(udpfd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), (char *)header, plen, udpaddr, dst_addr, dst_iface);
}
@@ -2104,7 +2105,11 @@ unsigned char *tcp_request(int confd, time_t now,
/* In case of local answer or no connections made. */
if (m == 0)
m = setup_reply(header, (unsigned int)size, addrp, flags, daemon->local_ttl);
{
m = setup_reply(header, (unsigned int)size, addrp, flags, daemon->local_ttl);
if (have_pseudoheader)
m = add_pseudoheader(header, m, ((unsigned char *) header) + 65536, daemon->edns_pktsz, 0, NULL, 0, do_bit, 0);
}
}
}