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import of dnsmasq-2.20.tar.gz

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This commit is contained in:
Simon Kelley
2005-01-23 12:06:08 +00:00
parent bb01cb9604
commit f6b7dc47c7
19 changed files with 906 additions and 438 deletions
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78
src/cache.c
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@@ -1,4 +1,4 @@
/* dnsmasq is Copyright (c) 2000 Simon Kelley
/* dnsmasq is Copyright (c) 2000-2005 Simon Kelley
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -156,32 +156,52 @@ static int is_outdated_cname_pointer(struct crec *crecp)
return 1;
}
static void cache_scan_free(char *name, struct all_addr *addr, time_t now, unsigned short flags)
static int is_expired(time_t now, struct crec *crecp)
{
if (crecp->flags & F_IMMORTAL)
return 0;
if (difftime(now, crecp->ttd) < 0)
return 0;
return 1;
}
static int cache_scan_free(char *name, struct all_addr *addr, time_t now, unsigned short flags)
{
/* Scan and remove old entries.
If (flags & F_FORWARD) then remove any forward entries for name and any expired
entries but only in the same hash bucket as name.
If (flags & F_REVERSE) then remove any reverse entries for addr and any expired
entries in the whole cache.
If (flags == 0) remove any expired entries in the whole cache. */
If (flags == 0) remove any expired entries in the whole cache.
In the flags & F_FORWARD case, the return code is valid, and returns zero if the
name exists in the cache as a HOSTS or DHCP entry (these are never deleted) */
#define F_CACHESTATUS (F_HOSTS | F_DHCP | F_FORWARD | F_REVERSE | F_IPV4 | F_IPV6 | F_CNAME)
struct crec *crecp, **up;
flags &= (F_FORWARD | F_REVERSE | F_IPV6 | F_IPV4 | F_CNAME);
if (flags & F_FORWARD)
{
for (up = hash_bucket(name), crecp = *up; crecp; crecp = crecp->hash_next)
if ((!(crecp->flags & F_IMMORTAL) && difftime(now, crecp->ttd) > 0) ||
is_outdated_cname_pointer(crecp) ||
((flags == (crecp->flags & F_CACHESTATUS)) && hostname_isequal(cache_get_name(crecp), name)))
{
if (is_expired(now, crecp) || is_outdated_cname_pointer(crecp))
{
*up = crecp->hash_next;
if (!(crecp->flags & (F_HOSTS | F_DHCP)))
{
{
cache_unlink(crecp);
cache_free(crecp);
}
}
else if ((crecp->flags & F_FORWARD) &&
((flags & crecp->flags & (F_IPV4 | F_IPV6)) || (crecp->flags & F_CNAME)) &&
hostname_isequal(cache_get_name(crecp), name))
{
if (crecp->flags & (F_HOSTS | F_DHCP))
return 0;
*up = crecp->hash_next;
cache_unlink(crecp);
cache_free(crecp);
}
else
up = &crecp->hash_next;
@@ -196,8 +216,7 @@ static void cache_scan_free(char *name, struct all_addr *addr, time_t now, unsig
#endif
for (i = 0; i < hash_size; i++)
for (crecp = hash_table[i], up = &hash_table[i]; crecp; crecp = crecp->hash_next)
if ((!(crecp->flags & F_IMMORTAL) && difftime(now, crecp->ttd) > 0) ||
((flags == (crecp->flags & F_CACHESTATUS)) && memcmp(&crecp->addr.addr, addr, addrlen) == 0))
if (is_expired(now, crecp))
{
*up = crecp->hash_next;
if (!(crecp->flags & (F_HOSTS | F_DHCP)))
@@ -206,9 +225,20 @@ static void cache_scan_free(char *name, struct all_addr *addr, time_t now, unsig
cache_free(crecp);
}
}
else if (!(crecp->flags & (F_HOSTS | F_DHCP)) &&
(flags & crecp->flags & F_REVERSE) &&
(flags & crecp->flags & (F_IPV4 | F_IPV6)) &&
memcmp(&crecp->addr.addr, addr, addrlen) == 0)
{
*up = crecp->hash_next;
cache_unlink(crecp);
cache_free(crecp);
}
else
up = &crecp->hash_next;
}
return 1;
}
/* Note: The normal calling sequence is
@@ -260,8 +290,13 @@ struct crec *cache_insert(char *name, struct all_addr *addr,
return NULL;
/* First remove any expired entries and entries for the name/address we
are currently inserting. */
cache_scan_free(name, addr, now, flags);
are currently inserting. Fail is we attempt to delete a name from
/etc/hosts or DHCP. */
if (!cache_scan_free(name, addr, now, flags))
{
insert_error = 1;
return NULL;
}
/* Now get a cache entry from the end of the LRU list */
while (1) {
@@ -376,8 +411,7 @@ struct crec *cache_find_by_name(struct crec *crecp, char *name, time_t now, unsi
{
next = crecp->hash_next;
if (!is_outdated_cname_pointer(crecp) &&
((crecp->flags & F_IMMORTAL) || difftime(now, crecp->ttd) < 0))
if (!is_expired(now, crecp) && !is_outdated_cname_pointer(crecp))
{
if ((crecp->flags & F_FORWARD) &&
(crecp->flags & prot) &&
@@ -458,7 +492,7 @@ struct crec *cache_find_by_addr(struct crec *crecp, struct all_addr *addr,
for(i=0; i<hash_size; i++)
for (crecp = hash_table[i], up = &hash_table[i]; crecp; crecp = crecp->hash_next)
if ((crecp->flags & F_IMMORTAL) || difftime(now, crecp->ttd) < 0)
if (!is_expired(now, crecp))
{
if ((crecp->flags & F_REVERSE) &&
(crecp->flags & prot) &&
@@ -835,7 +869,15 @@ void log_query(unsigned short flags, char *name, struct all_addr *addr,
strcat(addrbuff, "-IPv6");
}
else if (flags & F_CNAME)
strcpy(addrbuff, "<CNAME>");
{
/* nasty abuse of IPV4 and IPV6 flags */
if (flags & F_IPV4)
strcpy(addrbuff, "<MX>");
else if (flags & F_IPV6)
strcpy(addrbuff, "<SRV>");
else
strcpy(addrbuff, "<CNAME>");
}
else
#ifdef HAVE_IPV6
inet_ntop(flags & F_IPV4 ? AF_INET : AF_INET6,