I very much appreciate the work of reyk@ on dhclient to make it renew the lease
when the
link is lost. However it might happen that you don't have a link at the moment
where
you launch dhclient but you know that you might get a link afterwards.
This is true when you launch your laptop somewhere where you have wifi
connectivity
but unfortunately you're in a spot where you don't currently receive it.
If you specify 'dhcp' in hostname.<if> you will have to wait until dhclient
times out
or hit Ctrl-C at startup.
This tiny patch adds an option to dhclient to tell it to just go into
background and wait
until you get a link.
I would appreciate any comments.
Thanks!
Index: dhclient.c
===================================================================
RCS file: /cvs/src/sbin/dhclient/dhclient.c,v
retrieving revision 1.118
diff -u -r1.118 dhclient.c
--- dhclient.c 9 May 2008 05:19:14 -0000 1.118
+++ dhclient.c 18 May 2008 15:11:53 -0000
@@ -253,7 +253,7 @@
int
main(int argc, char *argv[])
{
- int ch, fd, quiet = 0, i = 0, pipe_fd[2];
+ int ch, fd, quiet = 0, background = 0, i = 0, pipe_fd[2];
extern char *__progname;
struct passwd *pw;
@@ -261,8 +261,11 @@
openlog(__progname, LOG_PID | LOG_NDELAY, DHCPD_LOG_FACILITY);
setlogmask(LOG_UPTO(LOG_INFO));
- while ((ch = getopt(argc, argv, "c:dl:qu")) != -1)
+ while ((ch = getopt(argc, argv, "bc:dl:qu")) != -1)
switch (ch) {
+ case 'b':
+ background = 1;
+ break;
case 'c':
path_dhclient_conf = optarg;
break;
@@ -319,6 +322,9 @@
read_client_conf();
+ if (background)
+ goto dispatch;
+
if (!(ifi->linkstat = interface_link_status(ifi->name))) {
fprintf(stderr, "%s: no link ...", ifi->name);
if (config->link_timeout == 0) {
@@ -409,7 +415,7 @@
{
extern char *__progname;
- fprintf(stderr, "usage: %s [-dqu] [-c file] [-l file] interface\n",
+ fprintf(stderr, "usage: %s [-bdqu] [-c file] [-l file] interface\n",
__progname);
exit(1);
}
