ifupdown: make dhcp start/stop scripts user configurable

in /etc/network/interfaces. Patch author is Gabriel L. Somlo <somlo@cmu.edu>

diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index 99b1c59d99f07d29a0ab7b096f10f60a78c26e70..fae0684b59f27914b05cc7bae323b6ddb8fd4858 100644 (file)
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -452,6 +452,14 @@ static int static_down(struct interface_defn_t *ifd, execfn *exec)
 
 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 {
+       int i;
+
+       for (i = 0; i < ifd->n_options; i++) {
+               if (strcmp(ifd->option[i].name, "dhcp-start-cmd") == 0) {
+                       return execute(ifd->option[i].value, ifd, exec);
+               }
+       }
+
        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;
@@ -463,6 +471,14 @@ static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 
 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 {
+       int i;
+
+       for (i = 0; i < ifd->n_options; i++) {
+               if (strcmp(ifd->option[i].name, "dhcp-stop-cmd") == 0) {
+                       return execute(ifd->option[i].value, 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 */