wwan/ppp: send explicit port speed to pppd when port speed is zero (rh #1281731)

Some TTY drivers or devices appear to ignore port speed and always
report zero.  Technically this means the port is hung up and control
lines should be disconnected, but with USB devices many of the serial
port attributes are meaningless and ignored by some devices.

pppd requires the port's speed to be greater than zero, and will
exit immediately when that is not the case, even though these
modems will work fine.  Passing an explicit speed to pppd in this
case works around the issue, as pppd attempts to set that speed
on the port and doesn't actually care if that operation fails.

https://bugzilla.redhat.com/show_bug.cgi?id=1281731

3 files changed, 31 insertions, 3 deletions

diff --git a/src/devices/adsl/nm-device-adsl.c b/src/devices/adsl/nm-device-adsl.c
index a5b6641abf..d1d0a9b0de 100644
--- a/src/devices/adsl/nm-device-adsl.c
+++ b/src/devices/adsl/nm-device-adsl.c
@@ -477,7 +477,7 @@ act_stage3_ip4_config_start (NMDevice *device,
 	}
 
 	priv->ppp_manager = nm_ppp_manager_new (ppp_iface);
-	if (nm_ppp_manager_start (priv->ppp_manager, req, nm_setting_adsl_get_username (s_adsl), 30, &err)) {
+	if (nm_ppp_manager_start (priv->ppp_manager, req, nm_setting_adsl_get_username (s_adsl), 30, 0, &err)) {
 		g_signal_connect (priv->ppp_manager, NM_PPP_MANAGER_STATE_CHANGED,
 		                  G_CALLBACK (ppp_state_changed),
 		                  self);
diff --git a/src/devices/nm-device-ethernet.c b/src/devices/nm-device-ethernet.c
index fd80a607a2..3604a168a8 100644
--- a/src/devices/nm-device-ethernet.c
+++ b/src/devices/nm-device-ethernet.c
@@ -937,7 +937,7 @@ pppoe_stage3_ip4_config_start (NMDeviceEthernet *self, NMDeviceStateReason *reas
 	g_assert (s_pppoe);
 
 	priv->ppp_manager = nm_ppp_manager_new (nm_device_get_iface (NM_DEVICE (self)));
-	if (nm_ppp_manager_start (priv->ppp_manager, req, nm_setting_pppoe_get_username (s_pppoe), 30, &err)) {
+	if (nm_ppp_manager_start (priv->ppp_manager, req, nm_setting_pppoe_get_username (s_pppoe), 30, 0, &err)) {
 		g_signal_connect (priv->ppp_manager, NM_PPP_MANAGER_STATE_CHANGED,
 		                  G_CALLBACK (ppp_state_changed),
 		                  self);
diff --git a/src/devices/wwan/nm-modem.c b/src/devices/wwan/nm-modem.c
index d5f12b1cc2..9897424466 100644
--- a/src/devices/wwan/nm-modem.c
+++ b/src/devices/wwan/nm-modem.c
@@ -23,7 +23,9 @@
 
 #include "nm-modem.h"
 
+#include <fcntl.h>
 #include <string.h>
+#include <termios.h>
 
 #include "nm-core-internal.h"
 #include "nm-platform.h"
@@ -492,6 +494,23 @@ ppp_stats (NMPPPManager *ppp_manager,
 	}
 }
 
+static gboolean
+port_speed_is_zero (const char *port)
+{
+    struct termios options;
+    gs_fd_close int fd = -1;
+
+    fd = open (port, O_RDWR | O_NONBLOCK | O_NOCTTY);
+    if (fd < 0)
+		return FALSE;
+
+    memset (&options, 0, sizeof (struct termios));
+    if (tcgetattr (fd, &options) != 0)
+        return FALSE;
+
+    return cfgetospeed (&options) == B0;
+}
+
 static NMActStageReturn
 ppp_stage3_ip_config_start (NMModem *self,
                             NMActRequest *req,
@@ -502,6 +521,7 @@ ppp_stage3_ip_config_start (NMModem *self,
 	GError *error = NULL;
 	NMActStageReturn ret;
 	guint ip_timeout = 30;
+	guint baud_override = 0;
 
 	g_return_val_if_fail (NM_IS_MODEM (self), NM_ACT_STAGE_RETURN_FAILURE);
 	g_return_val_if_fail (NM_IS_ACT_REQUEST (req), NM_ACT_STAGE_RETURN_FAILURE);
@@ -531,8 +551,16 @@ ppp_stage3_ip_config_start (NMModem *self,
 		ip_timeout = priv->mm_ip_timeout;
 	}
 
+	/* Some tty drivers and modems ignore port speed, but pppd requires the
+	 * port speed to be > 0 or it exits. If the port speed is 0 pass an
+	 * explicit speed to pppd to prevent the exit.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=1281731
+	 */
+	if (port_speed_is_zero (priv->data_port))
+		baud_override = 57600;
+
 	priv->ppp_manager = nm_ppp_manager_new (priv->data_port);
-	if (nm_ppp_manager_start (priv->ppp_manager, req, ppp_name, ip_timeout, &error)) {
+	if (nm_ppp_manager_start (priv->ppp_manager, req, ppp_name, ip_timeout, baud_override, &error)) {
 		g_signal_connect (priv->ppp_manager, NM_PPP_MANAGER_STATE_CHANGED,
 		                  G_CALLBACK (ppp_state_changed),
 		                  self);