Package: network-manager
Version: 0.8.999-1
Severity: normal
On a Finnish free software IRC channel I heard that sometimes when
people use a 3G stick of their Finnish ISP (Saunalahti) their DNS
requests are sent to 4.2.2.1 which according to traceroute is
somewhere in the UK.
I have not hit this bug myself but I started investigating and found the
below function in the source code. Does this mean that gtei.net can
profile what websites people visit when they use a Finnish ISP?
static void
ppp_ip4_config (NMPPPManager *ppp_manager,
const char *iface,
NMIP4Config *config,
gpointer user_data)
{
NMModem *self = NM_MODEM (user_data);
NMModemPrivate *priv = NM_MODEM_GET_PRIVATE (self);
guint32 i, num;
guint32 bad_dns1 = htonl (0x0A0B0C0D);
guint32 good_dns1 = htonl (0x04020201); /* GTE nameserver */
guint32 bad_dns2 = htonl (0x0A0B0C0E);
guint32 good_dns2 = htonl (0x04020202); /* GTE nameserver */
gboolean dns_workaround = FALSE;
/* Work around a PPP bug (#1732) which causes many mobile broadband
* providers to return 10.11.12.13 and 10.11.12.14 for the DNS servers.
* Apparently fixed in ppp-2.4.5 but we've had some reports that this is
* not the case.
*
*
http://git.ozlabs.org/?p=ppp.git;a=commitdiff_plain;h=2e09ef6886bbf00bc5a9a641110f801e372ffde6
*
http://git.ozlabs.org/?p=ppp.git;a=commitdiff_plain;h=f8191bf07df374f119a07910a79217c7618f113e
*/
num = nm_ip4_config_get_num_nameservers (config);
if (num == 2) {
gboolean found1 = FALSE, found2 = FALSE;
for (i = 0; i < num; i++) {
guint32 ns = nm_ip4_config_get_nameserver (config, i);
if (ns == bad_dns1)
found1 = TRUE;
else if (ns == bad_dns2)
found2 = TRUE;
}
/* Be somewhat conservative about substitutions; the "bad"
nameservers
* could actually be valid in some cases, so only substitute if
ppp
* returns *only* the two bad nameservers.
*/
dns_workaround = (found1 && found2);
}
if (!num || dns_workaround) {
nm_log_warn (LOGD_PPP, "compensating for invalid PPP-provided
nameservers");
nm_ip4_config_reset_nameservers (config);
nm_ip4_config_add_nameserver (config, good_dns1);
nm_ip4_config_add_nameserver (config, good_dns2);
}
priv->pending_ip4_config = g_object_ref (config);
g_signal_emit (self, signals[IP4_CONFIG_RESULT], 0, iface, config,
NULL);
}
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