Package: ifupdown
Version: 0.6.7
Severity: wishlist
Tags: patch
I'm using ifupdown's mapping feature to map interface profiles to physical
interfaces, and I'd like to let it autodetect my current network environment
and configure interfaces accordingly.
This is achieved by a customized version of ping-places.sh in the examples
directory of the original source. However that script configures interfaces
prior to ping other hosts via ip/route, but configuring a wireless interface
is much more sophisticated (setting essid, channels, etc).
As I don't want to replicate all information into my version of
ping-places.sh I'd like to recurse ifup/ifdown to perform configuration of a
specified interface scheme, but this is not allowed as ifup locks on its
state file hard, and the ifup command deadlocks.
My solution was to add a --no-state command line option to ifup/ifdown,
which instructs ifup not to save the interface state, thus no locking is
necessary either. This makes my setup work nicely. Please consider applying
the patch, also included in this bugreport.
For your information here's the script I'm using:
#!/bin/sh
if [ d -u -ne 0 ] || [ "$1" = "" ]; then exit 1; fi
if [ -x /usr/bin/fping ]; then
PING="/usr/bin/fping"
else
PING="/bin/ping -c 2"
fi
iface="$1"
which=""
logger -t detectif "Trying to detect IP for $iface"
while read pingme scheme; do
if [ "$which" ]; then continue; fi
logger -t detectif " Trying $pingme ($scheme)"
# flush any routes/ip configuration
ip route flush dev $iface >/dev/null 2>&1
ifconfig $iface down
ifup --no-state $iface=$scheme >&2
logger -t detectif " Interface configured for scheme $scheme, starting
ping"
if $PING $pingme >/dev/null 2>&1; then
ifdown --force --no-state $iface=$scheme >&2
which="$scheme"
break
fi
logger -t detectif " Ping failed for scheme $scheme, trying next"
ifdown --force --no-state $iface=$scheme >&2
done
if [ "$which" ]; then echo $which; exit 0; fi
exit 1
And here's the set of mapping lines I'm using with that script:
mapping eth1
script /usr/local/bin/ping-places.sh
map 192.168.13.254 wifi-szekszard
map 192.168.1.1 wifi-home
And here's the patch:
--- ifupdown-0.6.7/ifupdown.nw 2005-04-05 19:31:29.000000000 +0200
+++ ifupdown-0.6.7-bazsi/ifupdown.nw 2005-08-13 13:10:34.000000000 +0200
@@ -3146,6 +3146,7 @@ struct option long_opts[] = {
{"allow", required_argument, NULL, 3 },
{"interfaces", required_argument, NULL, 'i'},
{"exclude", required_argument, NULL, 'e'},
+ {"no-state", no_argument, NULL, 4 },
{"no-act", no_argument, NULL, 'n'},
{"no-mappings", no_argument, NULL, 1 },
{"force", no_argument, NULL, 2 },
@@ -3159,11 +3160,13 @@ the various things. The only special not
<<exported symbols>>=
extern int no_act;
+extern int no_state;
extern int verbose;
@
<<main global variables>>=
int no_act = 0;
+int no_state = 0;
int verbose = 0;
@
@@ -3222,6 +3225,7 @@ static void help(char *execname) {
printf("\t\t\t\t(note that this option doesn't disable mappings)\n");
printf("\t-v, --verbose\t\tprint out what would happen before doing
it\n");
printf("\t--no-mappings\t\tdon't run any mappings\n");
+ printf("\t--no-state\t\t\tdon't record/lock/check interface state\n");
printf("\t--force\t\t\tforce de/configuration\n");
exit(0);
}
@@ -3282,6 +3286,11 @@ case 1:
case 2:
force = 1;
break;
+@
+<<[[getopt]] possibilities>>=
+case 4:
+ no_state = 1;
+ break;
@
<<[[getopt]] possibilities>>=
case 'e':
@@ -3630,8 +3639,8 @@ static FILE *state_fp = NULL;
<<lock 'n load ifupdown state>>=
{
- state_fp = fopen(statefile, no_act ? "r" : "a+");
- if (state_fp == NULL && !no_act) {
+ state_fp = fopen(statefile, (no_act || no_state) ? "r" : "a+");
+ if (state_fp == NULL && (!no_act && !no_state)) {
fprintf(stderr,
"%s: failed to open statefile %s: %s\n",
argv[0], statefile, strerror(errno));
@@ -3642,7 +3651,7 @@ static FILE *state_fp = NULL;
char buf[80];
char *p;
- if (!no_act) {
+ if (!no_act && !no_state) {
int flags;
if ((flags = fcntl(fileno(state_fp), F_GETFD)) < 0
@@ -3688,7 +3697,7 @@ if (state_fp != NULL) {
<<commit ifupdown state>>=
-if (state_fp != NULL && !no_act) {
+if (state_fp != NULL && (!no_act && !no_state)) {
int i;
if (ftruncate(fileno(state_fp), 0) < 0)
-- System Information:
Debian Release: 3.1
Architecture: i386 (i686)
Kernel: Linux 2.6.12
Locale: LANG=C, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Versions of packages ifupdown depends on:
ii debconf [debconf-2.0] 1.4.30.13 Debian configuration management sy
ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an
ii net-tools 1.60-10 The NET-3 networking toolkit
-- debconf information:
ifupdown/convert-interfaces: true
--
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