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import of dnsmasq-2.43.tar.gz

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This commit is contained in:
Simon Kelley
2008-07-11 11:11:42 +01:00
parent 9e038946a1
commit 1a6bca81f6
28 changed files with 5052 additions and 4241 deletions
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79
src/network.c
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@@ -441,6 +441,61 @@ struct listener *create_bound_listeners(void)
return listeners;
}
/* return a UDP socket bound to a random port, have to coper with straying into
occupied port nos and reserved ones. */
int random_sock(int family)
{
int fd;
if ((fd = socket(family, SOCK_DGRAM, 0)) != -1)
{
union mysockaddr addr;
memset(&addr, 0, sizeof(addr));
addr.in.sin_family = family;
if (fix_fd(fd))
while (1)
{
unsigned short port = rand16();
if (port <= (unsigned short) daemon->min_port)
continue;
if (family == AF_INET)
{
addr.in.sin_addr.s_addr = INADDR_ANY;
addr.in.sin_port = htons(port);
#ifdef HAVE_SOCKADDR_SA_LEN
addr.in.sin_len = sizeof(struct sockaddr_in);
#endif
}
#ifdef HAVE_IPV6
else
{
addr.in6.sin6_addr = in6addr_any;
addr.in6.sin6_port = htons(port);
#ifdef HAVE_SOCKADDR_SA_LEN
addr.in6.sin6_len = sizeof(struct sockaddr_in6);
#endif
}
#endif
if (bind(fd, (struct sockaddr *)&addr, sa_len(&addr)) == 0)
return fd;
if (errno != EADDRINUSE && errno != EACCES)
break;
}
close(fd);
}
return -1;
}
int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp)
{
union mysockaddr addr_copy = *addr;
@@ -473,6 +528,25 @@ static struct serverfd *allocate_sfd(union mysockaddr *addr, char *intname)
struct serverfd *sfd;
int errsave;
/* when using random ports, servers which would otherwise use
the INADDR_ANY/port0 socket have sfd set to NULL */
if (!daemon->osport)
{
errno = 0;
if (addr->sa.sa_family == AF_INET &&
addr->in.sin_addr.s_addr == INADDR_ANY &&
addr->in.sin_port == htons(0))
return NULL;
#ifdef HAVE_IPV6
if (addr->sa.sa_family == AF_INET6 &&
memcmp(&addr->in6.sin6_addr, &in6addr_any, sizeof(in6addr_any)) == 0 &&
addr->in6.sin6_port == htons(0))
return NULL;
#endif
}
/* may have a suitable one already */
for (sfd = daemon->sfds; sfd; sfd = sfd->next )
if (sockaddr_isequal(&sfd->source_addr, addr) &&
@@ -538,6 +612,7 @@ void pre_allocate_sfds(void)
for (srv = daemon->servers; srv; srv = srv->next)
if (!(srv->flags & (SERV_LITERAL_ADDRESS | SERV_NO_ADDR)) &&
!allocate_sfd(&srv->source_addr, srv->interface) &&
errno != 0 &&
(daemon->options & OPT_NOWILD))
{
prettyprint_addr(&srv->addr, daemon->namebuff);
@@ -585,7 +660,9 @@ void check_servers(void)
}
/* Do we need a socket set? */
if (!new->sfd && !(new->sfd = allocate_sfd(&new->source_addr, new->interface)))
if (!new->sfd &&
!(new->sfd = allocate_sfd(&new->source_addr, new->interface)) &&
errno != 0)
{
my_syslog(LOG_WARNING,
_("ignoring nameserver %s - cannot make/bind socket: %s"),