ifupdown: improve compatibility with Debian

Set environment variable 'PHASE'.
Treat post-up and pre-down as aliases for up and down.
Uses the same logic as ifupdown.nw from ifupdown-0.6.16.
Makes it possible to execute Debian's ifupdown script for
wpa-supplicant.

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index dfda206..9b34986 100644 (file)
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -140,8 +140,6 @@ static const char keywords_up_down[] ALIGN1 =
        "up\0"
        "down\0"
        "pre-up\0"
-       "pre-down\0"
-       "post-up\0"
        "post-down\0"
 ;
 
@@ -895,6 +893,11 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
                                if (rest_of_line[0] == '\0')
                                        bb_error_msg_and_die("option with empty value \"%s\"", buf);
 
+                               if (strcmp(first_word, "post-up") == 0)
+                                       first_word += 5; /* "up" */
+                               else if (strcmp(first_word, "pre-down") == 0)
+                                       first_word += 4; /* "down" */
+
                                /* If not one of "up", "down",... words... */
                                if (index_in_strings(keywords_up_down, first_word) < 0) {
                                        int i;
@@ -963,7 +966,7 @@ static char *setlocalenv(const char *format, const char *name, const char *value
        return result;
 }
 
-static void set_environ(struct interface_defn_t *iface, const char *mode)
+static void set_environ(struct interface_defn_t *iface, const char *mode, const char *opt)
 {
        int i;
        char **pp;
@@ -976,7 +979,7 @@ static void set_environ(struct interface_defn_t *iface, const char *mode)
        }
 
        /* note: last element will stay NULL: */
-       G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 6));
+       G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 7));
        pp = G.my_environ;
 
        for (i = 0; i < iface->n_options; i++) {
@@ -990,6 +993,7 @@ static void set_environ(struct interface_defn_t *iface, const char *mode)
        *pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
        *pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
        *pp++ = setlocalenv("%s=%s", "MODE", mode);
+       *pp++ = setlocalenv("%s=%s", "PHASE", opt);
        if (G.startup_PATH)
                *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
 }
@@ -1044,21 +1048,21 @@ static int check(char *str)
 static int iface_up(struct interface_defn_t *iface)
 {
        if (!iface->method->up(iface, check)) return -1;
-       set_environ(iface, "start");
+       set_environ(iface, "start", "pre-up");
        if (!execute_all(iface, "pre-up")) return 0;
        if (!iface->method->up(iface, doit)) return 0;
+       set_environ(iface, "start", "post-up");
        if (!execute_all(iface, "up")) return 0;
-       if (!execute_all(iface, "post-up")) return 0;
        return 1;
 }
 
 static int iface_down(struct interface_defn_t *iface)
 {
        if (!iface->method->down(iface,check)) return -1;
-       set_environ(iface, "stop");
-       if (!execute_all(iface, "pre-down")) return 0;
+       set_environ(iface, "stop", "pre-down");
        if (!execute_all(iface, "down")) return 0;
        if (!iface->method->down(iface, doit)) return 0;
+       set_environ(iface, "stop", "post-down");
        if (!execute_all(iface, "post-down")) return 0;
        return 1;
 }