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Simplify preceding fix.

Browse Source 
Remove distinction between retry with same QID/SP and
retry for same query with different QID/SP. If the
QID/SP are the same as an existing one, simply retry,
if a new QID/SP is seen, add to the list to be replied to.
This commit is contained in:
Simon Kelley
2021-02-18 21:35:09 +00:00
parent 141a26f979
commit 305cb79c57
1 changed files with 22 additions and 42 deletions
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64
src/forward.c
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@@ -17,9 +17,6 @@
#include "dnsmasq.h"
static struct frec *lookup_frec(unsigned short id, int fd, int family, void *hash);
static struct frec *lookup_frec_by_sender(unsigned short id,
union mysockaddr *addr,
void *hash);
static struct frec *lookup_frec_by_query(void *hash, unsigned int flags);
static unsigned short get_id(void);
@@ -278,18 +275,20 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
fwd_flags |= FREC_DO_QUESTION;
#endif
/* Check for retry on existing query from same source */
if (!forward && (!(forward = lookup_frec_by_sender(ntohs(header->id), udpaddr, hash))))
/* Check for retry on existing query */
if (!forward && (forward = lookup_frec_by_query(hash, fwd_flags)))
{
/* Maybe query from new source, but the same query may be in progress
from another source. If so, just add this client to the
list that will get the reply.*/
if (!option_bool(OPT_ADD_MAC) && !option_bool(OPT_MAC_B64) &&
(forward = lookup_frec_by_query(hash, fwd_flags)))
{
struct frec_src *new;
struct frec_src *src;
for (src = &forward->frec_src; src; src = src->next)
if (src->orig_id == ntohs(header->id) &&
sockaddr_isequal(&src->source, udpaddr))
break;
/* Existing query, but from new source, just add this
client to the list that will get the reply.*/
if (!src)
{
/* Note whine_malloc() zeros memory. */
if (!daemon->free_frec_src &&
daemon->frec_src_count < daemon->ftabsize &&
@@ -303,16 +302,16 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
if (!daemon->free_frec_src)
return 0;
new = daemon->free_frec_src;
daemon->free_frec_src = new->next;
new->next = forward->frec_src.next;
forward->frec_src.next = new;
new->orig_id = ntohs(header->id);
new->source = *udpaddr;
new->dest = *dst_addr;
new->log_id = daemon->log_id;
new->iface = dst_iface;
new->fd = udpfd;
src = daemon->free_frec_src;
daemon->free_frec_src = src->next;
src->next = forward->frec_src.next;
forward->frec_src.next = src;
src->orig_id = ntohs(header->id);
src->source = *udpaddr;
src->dest = *dst_addr;
src->log_id = daemon->log_id;
src->iface = dst_iface;
src->fd = udpfd;
}
}
@@ -2433,25 +2432,6 @@ static struct frec *lookup_frec(unsigned short id, int fd, int family, void *has
return NULL;
}
static struct frec *lookup_frec_by_sender(unsigned short id,
union mysockaddr *addr,
void *hash)
{
struct frec *f;
struct frec_src *src;
for (f = daemon->frec_list; f; f = f->next)
if (f->sentto &&
!(f->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY)) &&
memcmp(hash, f->hash, HASH_SIZE) == 0)
for (src = &f->frec_src; src; src = src->next)
if (src->orig_id == id &&
sockaddr_isequal(&src->source, addr))
return f;
return NULL;
}
static struct frec *lookup_frec_by_query(void *hash, unsigned int flags)
{
struct frec *f;