Introduced by dnsmasq commit:
commit 54dd393f3938fc0c19088fbd319b95e37d81a2b0
CommitDate: 2012-06-20 11:23:38 +0100
Add --bind-dynamic
git describe: v2.63test1 contains: v2.63test1^0
Signed-off-by: Ján Tomko <jtomko@xxxxxxxxxx>
---
src/network/bridge_driver.c | 68 ++++++-------------------------------
1 file changed, 11 insertions(+), 57 deletions(-)
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index e57731742b..dffe4e1574 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -1062,7 +1062,6 @@ networkDnsmasqConfContents(virNetworkObj *obj,
size_t i;
virNetworkDNSDef *dns = &def->dns;
bool wantDNS = dns->enable != VIR_TRISTATE_BOOL_NO;
- virNetworkIPDef *tmpipdef;
virNetworkIPDef *ipdef;
virNetworkIPDef *ipv4def;
virNetworkIPDef *ipv6def;
@@ -1173,62 +1172,17 @@ networkDnsmasqConfContents(virNetworkObj *obj,
virBufferAddLit(&configbuf, "except-interface=lo0\n");
#endif
- if (dnsmasqCapsGet(caps, DNSMASQ_CAPS_BIND_DYNAMIC)) {
- /* using --bind-dynamic with only --interface (no
- * --listen-address) prevents dnsmasq from responding to dns
- * queries that arrive on some interface other than our bridge
- * interface (in other words, requests originating somewhere
- * other than one of the virtual guests connected directly to
- * this network). This was added in response to CVE 2012-3411.
- */
- virBufferAsprintf(&configbuf,
- "bind-dynamic\n"
- "interface=%s\n",
- def->bridge);
- } else {
- virBufferAddLit(&configbuf, "bind-interfaces\n");
- /*
- * --interface does not actually work with dnsmasq < 2.47,
- * due to DAD for ipv6 addresses on the interface.
- *
- * virCommandAddArgList(cmd, "--interface", def->bridge, NULL);
- *
- * So listen on all defined IPv[46] addresses
- */
- for (i = 0;
- (tmpipdef = virNetworkDefGetIPByIndex(def, AF_UNSPEC, i));
- i++) {
- g_autofree char *ipaddr = virSocketAddrFormat(&tmpipdef->address);
-
- if (!ipaddr)
- return -1;
-
- /* also part of CVE 2012-3411 - if the host's version of
- * dnsmasq doesn't have bind-dynamic, only allow listening on
- * private/local IP addresses (see RFC1918/RFC3484/RFC4193)
- */
- if (!dnsmasqCapsGet(caps, DNSMASQ_CAPS_BINDTODEVICE) &&
- !virSocketAddrIsPrivate(&tmpipdef->address)) {
- unsigned long version = dnsmasqCapsGetVersion(caps);
-
- virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
- _("Publicly routable address %s is prohibited. "
- "The version of dnsmasq on this host (%d.%d) "
- "doesn't support the bind-dynamic option or "
- "use SO_BINDTODEVICE on listening sockets, "
- "one of which is required for safe operation "
- "on a publicly routable subnet "
- "(see CVE-2012-3411). You must either "
- "upgrade dnsmasq, or use a private/local "
- "subnet range for this network "
- "(as described in RFC1918/RFC3484/RFC4193)."),
- ipaddr, (int)version / 1000000,
- (int)(version % 1000000) / 1000);
- return -1;
- }
- virBufferAsprintf(&configbuf, "listen-address=%s\n", ipaddr);
- }
- }
+ /* using --bind-dynamic with only --interface (no
+ * --listen-address) prevents dnsmasq from responding to dns
+ * queries that arrive on some interface other than our bridge
+ * interface (in other words, requests originating somewhere
+ * other than one of the virtual guests connected directly to
+ * this network). This was added in response to CVE 2012-3411.
+ */
+ virBufferAsprintf(&configbuf,
+ "bind-dynamic\n"
+ "interface=%s\n",
+ def->bridge);
/* If this is an isolated network, set the default route option
* (3) to be empty to avoid setting a default route that's
--
2.31.1
