ifup/ifdown: make location of ifstate configurable

3 files changed, 16 insertions, 3 deletions

diff --git a/networking/Config.in b/networking/Config.in
index 77b5d2558..2ea0650a0 100644
--- a/networking/Config.in
+++ b/networking/Config.in
@@ -225,6 +225,16 @@ config IFUPDOWN
           "ifconfig", "route" and "run-parts" or the "ip" command, either
           via busybox or via standalone utilities.
 
+config IFUPDOWN_IFSTATE_PATH
+        string "Absolute path to ifstate file"
+        default "/var/run/ifstate"
+        help
+          ifupdown keeps state information in a file called ifstate.
+          Typically it is located in /var/run/ifstate, however
+          some distributions tend to put it in other places
+          (debian, for example, uses /etc/network/run/ifstate).
+          This config option defines location of ifstate.
+
 config FEATURE_IFUPDOWN_IP
         bool "Use ip applet"
         default n
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index e9f0a646c..5aa3fa5f1 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -10,7 +10,9 @@
  *  Changes to upstream version
  *  Remove checks for kernel version, assume kernel version 2.2.0 or better.
  *  Lines in the interfaces file cannot wrap.
- *  To adhere to the FHS, the default state file is /var/run/ifstate.
+ *  To adhere to the FHS, the default state file is /var/run/ifstate
+ *  (defined via CONFIG_IFUPDOWN_IFSTATE_PATH) and can be overridden by build
+ *  configuration.
  *
  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  */
@@ -1105,7 +1107,7 @@ static llist_t *find_iface_state(llist_t *state_list, const char *iface)
 static llist_t *read_iface_state(void)
 {
         llist_t *state_list = NULL;
-        FILE *state_fp = fopen("/var/run/ifstate", "r");
+        FILE *state_fp = fopen(CONFIG_IFUPDOWN_IFSTATE_PATH, "r");
 
         if (state_fp) {
                 char *start, *end_ptr;
@@ -1275,7 +1277,7 @@ int ifupdown_main(int argc, char **argv)
                         }
 
                         /* Actually write the new state */
-                        state_fp = xfopen("/var/run/ifstate", "w");
+                        state_fp = xfopen(CONFIG_IFUPDOWN_IFSTATE_PATH, "w");
                         state = state_list;
                         while (state) {
                                 if (state->data) {
diff --git a/scripts/defconfig b/scripts/defconfig
index 4d12f8ec5..088ff791a 100644
--- a/scripts/defconfig
+++ b/scripts/defconfig
@@ -554,6 +554,7 @@ CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ=y
 CONFIG_FEATURE_IFCONFIG_HW=y
 CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS=y
 CONFIG_IFUPDOWN=y
+CONFIG_IFUPDOWN_IFSTATE_PATH="/var/run/ifstate"
 CONFIG_FEATURE_IFUPDOWN_IP=y
 CONFIG_FEATURE_IFUPDOWN_IP_BUILTIN=y
 # CONFIG_FEATURE_IFUPDOWN_IFCONFIG_BUILTIN is not set