ifupdown: fix for standalone shell; removed hardcoded PATH

diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index 9841b5903c7735ea60e065180ae7b1974a12b4fd..99b1c59d99f07d29a0ab7b096f10f60a78c26e70 100644 (file)
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -106,6 +106,8 @@ enum {
 
 static char **__myenviron;
 
+static char *startup_PATH;
+
 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
 
 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
@@ -448,50 +450,29 @@ static int static_down(struct interface_defn_t *ifd, execfn *exec)
        return ((result == 2) ? 2 : 0);
 }
 
-static int execable(char *program)
-{
-       struct stat buf;
-       if (0 == stat(program, &buf)) {
-               if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
-                       return(1);
-               }
-       }
-       return(0);
-}
-
 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 {
-       if (execable("/sbin/udhcpc")) {
-               return( execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i "
-                                       "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec));
-       } else if (execable("/sbin/pump")) {
-               return( execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec));
-       } else if (execable("/sbin/dhclient")) {
-               return( execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec));
-       } else if (execable("/sbin/dhcpcd")) {
-               return( execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] "
-                                       "[[-l %leasetime%]] %iface%", ifd, exec));
-       }
-       return(0);
+       if (execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i "
+                       "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) return 1;
+       if (execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) return 1;
+       if (execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) return 1;
+       if (execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] "
+                       "[[-l %leasetime%]] %iface%", ifd, exec)) return 1;
+       return 0;
 }
 
 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 {
-       int result = 0;
-       if (execable("/sbin/udhcpc")) {
-               /* SIGUSR2 forces udhcpc to release the current lease and go inactive,
-                * and SIGTERM causes udhcpc to exit.  Signals are queued and processed
-                * sequentially so we don't need to sleep */
-               result = execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
-               result += execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
-       } else if (execable("/sbin/pump")) {
-               result = execute("pump -i %iface% -k", ifd, exec);
-       } else if (execable("/sbin/dhclient")) {
-               result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec);
-       } else if (execable("/sbin/dhcpcd")) {
-               result = execute("dhcpcd -k %iface%", ifd, exec);
-       }
-       return (result || static_down(ifd, exec));
+       /* SIGUSR2 forces udhcpc to release the current lease and go inactive,
+        * and SIGTERM causes udhcpc to exit.  Signals are queued and processed
+        * sequentially so we don't need to sleep */
+       if (execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec)
+        || execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec))
+               return 1;
+       if (execute("pump -i %iface% -k", ifd, exec)) return 1;
+       if (execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec)) return 1;
+       if (execute("dhcpcd -k %iface%", ifd, exec)) return 1;
+       return static_down(ifd, exec);
 }
 
 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
@@ -875,9 +856,7 @@ static void set_environ(struct interface_defn_t *iface, const char *mode)
        *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
        *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
        *(environend++) = setlocalenv("%s=%s", "MODE", mode);
-       /* FIXME: we must not impose our own PATH, it is admin's job!
-          Use PATH from parent env */
-       *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
+       *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH);
 }
 
 static int doit(char *str)
@@ -1103,6 +1082,9 @@ int ifupdown_main(int argc, char **argv)
                exit(EXIT_FAILURE);
        }
 
+       startup_PATH = getenv("PATH");
+       if (!startup_PATH) startup_PATH = "";
+
        /* Create a list of interfaces to work on */
        if (DO_ALL) {
                if (cmds == iface_up) {