Revert "ppp-manager: don't use kernel pppoe (rh #1034860, rh #1061641)"

We switched to user-mode PPPoE client to work around a bug in kernel
PPPoE code that caused pppd not to be notified when the connection was
terminated with a PADT before the LCP Termination Request.

The kernel bug has now been fixed upstream with commit 287f3a943fef
"pppoe: Use workqueue to die properly when a PADT is received", queued
for v4.1.

Since the issue affected only very particular scenarios and could
somehow be solved with the right configuration (see bugzilla entry),
we can safely revert the patch and restore the use of kernel mode
PPPoE.

This reverts commit 7955806a02db64b20079267743056d7d9d45af3b.

https://bugzilla.gnome.org/show_bug.cgi?id=742939

2 files changed, 12 insertions, 42 deletions

diff --git a/configure.ac b/configure.ac
index 0689fd526a..f51e09e94a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -619,15 +619,6 @@ fi
 AC_DEFINE_UNQUOTED(PPPD_PATH, "$PPPD_PATH", [Define to path of pppd binary])
 AC_SUBST(PPPD_PATH)
 
-AC_ARG_WITH(pppoe, AS_HELP_STRING([--with-pppoe=/path/to/pppoe], [path to pppoe binary]))
-if test "x${with_pppoe}" = x; then
-  AC_PATH_PROG(PPPOE_PATH, pppoe, [], $PATH:/sbin:/usr/sbin)
-else
-  PPPOE_PATH="$with_pppoe"
-fi
-AC_DEFINE_UNQUOTED(PPPOE_PATH, "$PPPOE_PATH", [Define to path of pppoe binary])
-AC_SUBST(PPPOE_PATH)
-
 # ModemManager1 with libmm-glib
 AC_ARG_WITH(modem-manager-1, AS_HELP_STRING([--with-modem-manager-1], [Enable new ModemManager1 interface support]),,[with_modem_manager_1=auto])
 if (test "${with_modem_manager_1}" != "no"); then
diff --git a/src/ppp-manager/nm-ppp-manager.c b/src/ppp-manager/nm-ppp-manager.c
index 17c9456e1b..e27c82b70c 100644
--- a/src/ppp-manager/nm-ppp-manager.c
+++ b/src/ppp-manager/nm-ppp-manager.c
@@ -854,7 +854,7 @@ create_pppd_cmd_line (NMPPPManager *self,
                       GError **err)
 {
 	NMPPPManagerPrivate *priv = NM_PPP_MANAGER_GET_PRIVATE (self);
-	const char *pppd_binary = NULL, *pppoe_binary = NULL;
+	const char *pppd_binary = NULL;
 	NMCmdLine *cmd;
 	gboolean ppp_debug;
 
@@ -864,13 +864,6 @@ create_pppd_cmd_line (NMPPPManager *self,
 	if (!pppd_binary)
 		return NULL;
 
-	if (   pppoe
-	    || (adsl && strcmp (nm_setting_adsl_get_protocol (adsl), NM_SETTING_ADSL_PROTOCOL_PPPOE))) {
-		pppoe_binary = nm_utils_find_helper ("pppoe", NULL, err);
-		if (!pppoe_binary)
-			return NULL;
-	}
-
 	/* Create pppd command line */
 	cmd = nm_cmd_line_new ();
 	nm_cmd_line_add_string (cmd, pppd_binary);
@@ -898,30 +891,21 @@ create_pppd_cmd_line (NMPPPManager *self,
 	}
 
 	if (pppoe) {
-		GString *pppoe_arg;
+		char *dev_str;
 		const char *pppoe_service;
-		char *quoted;
 
-		g_assert (pppoe_binary != NULL);
-		pppoe_arg = g_string_new (pppoe_binary);
+		nm_cmd_line_add_string (cmd, "plugin");
+		nm_cmd_line_add_string (cmd, "rp-pppoe.so");
 
-		g_string_append (pppoe_arg, " -I ");
-		quoted = g_shell_quote (priv->parent_iface);
-		g_string_append (pppoe_arg, quoted);
-		g_free (quoted);
+		dev_str = g_strdup_printf ("nic-%s", priv->parent_iface);
+		nm_cmd_line_add_string (cmd, dev_str);
+		g_free (dev_str);
 
 		pppoe_service = nm_setting_pppoe_get_service (pppoe);
 		if (pppoe_service) {
-			g_string_append (pppoe_arg, " -S ");
-			quoted = g_shell_quote (pppoe_service);
-			g_string_append (pppoe_arg, quoted);
-			g_free (quoted);
+			nm_cmd_line_add_string (cmd, "rp_pppoe_service");
+			nm_cmd_line_add_string (cmd, pppoe_service);
 		}
-
-		nm_cmd_line_add_string (cmd, "pty");
-		nm_cmd_line_add_string (cmd, pppoe_arg->str);
-
-		g_string_free (pppoe_arg, TRUE);
 	} else if (adsl) {
 		const gchar *protocol = nm_setting_adsl_get_protocol (adsl);
 
@@ -944,14 +928,9 @@ create_pppd_cmd_line (NMPPPManager *self,
 				nm_cmd_line_add_string (cmd, "vc-encaps");
 
 		} else if (!strcmp (protocol, NM_SETTING_ADSL_PROTOCOL_PPPOE)) {
-			char *pppoe_arg;
-
-			g_assert (pppoe_binary != NULL);
-
-			pppoe_arg = g_strdup_printf ("%s -I %s", pppoe_binary, priv->parent_iface);
-			nm_cmd_line_add_string (cmd, "pty");
-			nm_cmd_line_add_string (cmd, pppoe_arg);
-			g_free (pppoe_arg);
+			nm_cmd_line_add_string (cmd, "plugin");
+			nm_cmd_line_add_string (cmd, "rp-pppoe.so");
+			nm_cmd_line_add_string (cmd, priv->parent_iface);
 		}
 
 		nm_cmd_line_add_string (cmd, "noipdefault");