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Rationalise join_multicast()

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This commit is contained in:
Simon Kelley
2012-12-20 14:55:46 +00:00
parent 9d29949440
commit 5d162f20a9
5 changed files with 94 additions and 120 deletions
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78
src/dhcp6.c
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@@ -607,84 +607,6 @@ void dhcp_construct_contexts(time_t now)
send_alarm(periodic_ra(now), now);
}
}
static int join_multicast_worker(struct in6_addr *local, int prefix,
int scope, int if_index, int dad,
int preferred, int valid, void *vparam)
{
char ifrn_name[IFNAMSIZ];
struct ipv6_mreq mreq;
int fd, i, max = *((int *)vparam);
struct iname *tmp;
(void)prefix;
(void)scope;
(void)dad;
(void)preferred;
(void)valid;
/* record which interfaces we join on, so that we do it at most one per
interface, even when they have multiple addresses. Use outpacket
as an array of int, since it's always allocated here and easy
to expand for theoretical vast numbers of interfaces. */
for (i = 0; i < max; i++)
if (if_index == ((int *)daemon->outpacket.iov_base)[i])
return 1;
if ((fd = socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
return 0;
if (!indextoname(fd, if_index, ifrn_name))
{
close(fd);
return 0;
}
close(fd);
/* Are we doing DHCP on this interface? */
if (!iface_check(AF_INET6, (struct all_addr *)local, ifrn_name, NULL))
return 1;
for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
if (tmp->name && (strcmp(tmp->name, ifrn_name) == 0))
return 1;
mreq.ipv6mr_interface = if_index;
inet_pton(AF_INET6, ALL_RELAY_AGENTS_AND_SERVERS, &mreq.ipv6mr_multiaddr);
if (daemon->doing_dhcp6 &&
setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
return 0;
inet_pton(AF_INET6, ALL_SERVERS, &mreq.ipv6mr_multiaddr);
if (daemon->doing_dhcp6 &&
setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
return 0;
inet_pton(AF_INET6, ALL_ROUTERS, &mreq.ipv6mr_multiaddr);
if (daemon->doing_ra &&
setsockopt(daemon->icmp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
return 0;
expand_buf(&daemon->outpacket, (max+1) * sizeof(int));
((int *)daemon->outpacket.iov_base)[max++] = if_index;
*((int *)vparam) = max;
return 1;
}
void join_multicast(void)
{
int count = 0;
if (!iface_enumerate(AF_INET6, &count, join_multicast_worker))
die(_("failed to join DHCPv6 multicast group: %s"), NULL, EC_BADNET);
}
#endif