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Add --dynamic-host option.

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A and AAAA records which take their
network part from the network of a local interface. Useful
for routers with dynamically prefixes.
This commit is contained in:
Simon Kelley
2021-03-04 16:54:14 +00:00
parent 14e3f6ba19
commit b7cf754f6f
5 changed files with 170 additions and 44 deletions
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117
src/network.c
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@@ -348,36 +348,109 @@ static int iface_allowed(struct iface_param *param, int if_index, char *label,
/* Update addresses from interface_names. These are a set independent
of the set we're listening on. */
for (int_name = daemon->int_names; int_name; int_name = int_name->next)
if (strncmp(label, int_name->intr, IF_NAMESIZE) == 0 &&
(addr->sa.sa_family == int_name->family || int_name->family == 0))
if (strncmp(label, int_name->intr, IF_NAMESIZE) == 0)
{
if (param->spare)
struct addrlist *lp;
al = NULL;
if (addr->sa.sa_family == AF_INET && (int_name->flags & (IN4 | INP4)))
{
al = param->spare;
param->spare = al->next;
struct in_addr newaddr = addr->in.sin_addr;
if (int_name->flags & INP4)
{
if (netmask.s_addr == 0xffff)
continue;
newaddr.s_addr = (addr->in.sin_addr.s_addr & netmask.s_addr) |
(int_name->proto4.s_addr & ~netmask.s_addr);
}
/* check for duplicates. */
for (lp = int_name->addr; lp; lp = lp->next)
if (lp->flags == 0 && lp->addr.addr4.s_addr == newaddr.s_addr)
break;
if (!lp)
{
if (param->spare)
{
al = param->spare;
param->spare = al->next;
}
else
al = whine_malloc(sizeof(struct addrlist));
if (al)
{
al->flags = 0;
al->addr.addr4 = newaddr;
}
}
}
if (addr->sa.sa_family == AF_INET6 && (int_name->flags & (IN6 | INP6)))
{
struct in6_addr newaddr = addr->in6.sin6_addr;
if (int_name->flags & INP6)
{
int i;
/* No sense in doing /128. */
if (prefixlen == 128)
continue;
for (i = 0; i < 16; i++)
{
int bits = ((i+1)*8) - prefixlen;
if (bits >= 8)
newaddr.s6_addr[i] = int_name->proto6.s6_addr[i];
else if (bits >= 0)
{
unsigned char mask = 0xff << bits;
newaddr.s6_addr[i] =
(addr->in6.sin6_addr.s6_addr[i] & mask) |
(int_name->proto6.s6_addr[i] & ~mask);
}
}
}
/* check for duplicates. */
for (lp = int_name->addr; lp; lp = lp->next)
if ((lp->flags & ADDRLIST_IPV6) &&
IN6_ARE_ADDR_EQUAL(&lp->addr.addr6, &newaddr))
break;
if (!lp)
{
if (param->spare)
{
al = param->spare;
param->spare = al->next;
}
else
al = whine_malloc(sizeof(struct addrlist));
if (al)
{
al->flags = ADDRLIST_IPV6;
al->addr.addr6 = newaddr;
/* Privacy addresses and addresses still undergoing DAD and deprecated addresses
don't appear in forward queries, but will in reverse ones. */
if (!(iface_flags & IFACE_PERMANENT) || (iface_flags & (IFACE_DEPRECATED | IFACE_TENTATIVE)))
al->flags |= ADDRLIST_REVONLY;
}
}
}
else
al = whine_malloc(sizeof(struct addrlist));
if (al)
{
al->next = int_name->addr;
int_name->addr = al;
if (addr->sa.sa_family == AF_INET)
{
al->addr.addr4 = addr->in.sin_addr;
al->flags = 0;
}
else
{
al->addr.addr6 = addr->in6.sin6_addr;
al->flags = ADDRLIST_IPV6;
/* Privacy addresses and addresses still undergoing DAD and deprecated addresses
don't appear in forward queries, but will in reverse ones. */
if (!(iface_flags & IFACE_PERMANENT) || (iface_flags & (IFACE_DEPRECATED | IFACE_TENTATIVE)))
al->flags |= ADDRLIST_REVONLY;
}
}
}
}