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-rw-r--r--utils/pb-udhcpc84
1 files changed, 82 insertions, 2 deletions
diff --git a/utils/pb-udhcpc b/utils/pb-udhcpc
index ff23178..808f12a 100644
--- a/utils/pb-udhcpc
+++ b/utils/pb-udhcpc
@@ -9,16 +9,96 @@
PBOOT_USER_EVENT_SOCKET="/tmp/petitboot.ev"
log="/var/log/petitboot/pb-udhcpc.log"
+resolve_url() {
+ file="$1"
+
+ # URL? use as-is.
+ tmp=${file#://*}
+ if [ "$tmp" != "$file" ]
+ then
+ echo "$file"
+ fi
+
+ # Otherwise, TFTP using an appropriate host. Start with the
+ # DHCP 'tftp' option:
+ host=${tftp}
+
+ # next, try the DHCP next-server-address
+ [ -z "$host" ] && host=${siaddr}
+
+ # finally, use the DHCP server we got this lease from:
+ [ -z "$host" ] && host=${serverid}
+
+ echo "tftp://$host/$file"
+}
+
+do_pxe() {
+ basedir=$1
+
+ params="conf@/net/${interface} method=dhcp"
+
+ # first, try by MAC
+ mac=$(cat /sys/class/net/$interface/address)
+ pb-event $params url=$basedir/$mac
+
+ # try decreasing fragments of IP lease
+ ip_hex=$(printf '%02X%02X%02X%02X' $(echo $ip | tr '.' ' '))
+ for i in $(seq 8 -1 1)
+ do
+ frag=${hex_ip:0:$i}
+ pb-event $params url=$basedir/$frag
+ done
+
+ # last, use default
+ pb-event $params url=$basedir/default
+}
+
pb_add () {
+
+ # Look for an explicit config file location in the DHCP config-file
+ # parameter
+ if [ -n ${conffile} ]
+ then
+ url=$(resolve_url ${conffile})
+ pb-event conf@/net/${interface} url=$url method=dhcp
+ return
+ fi
+
+ # Otherwise, we'll need the boot-file parameter. Looks like udhcpc
+ # will give us different names, depending if the parameter was in
+ # the header, or specified by options
+ [ -n "$bootfile" ] && bootfile=${boot_file}
+
+ if [ -z "$bootfile" ]
+ then
+ return
+ fi
+
+ # PXE behaviour is to download the config file based on a file
+ # structure relative to the pxelinux binary
+ file=${bootfile}
+ [ -z "$file" ] && file=${boot_file}
+ if [ -n "$file" ]
+ then
+ basedir=${file%%/*}
+ do_pxe $basedir
+ fi
+
+ # Finally, add an option for the boot_file parameter
k_server_ip=${rootpath%%:*}
k_root_dir=${rootpath#*:}
- [ ${k_server_ip} != ${rootpath} ] || k_server_ip=${serverid}
+ args=
+ if [ -n $rootpath ]
+ then
+ [ ${k_server_ip} != ${rootpath} ] || k_server_ip=${serverid}
+ args="root=/dev/nfs ip=any nfsroot=${k_server_ip}:${k_root_dir}"
+ fi
pb-event add@/net/${interface} \
name=netboot \
image=tftp://${siaddr}/${boot_file} \
- args="root=/dev/nfs ip=any nfsroot=${k_server_ip}:${k_root_dir}"
+ args="$args"
}
pb_remove () {
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