# . this file to load the following utility functions # # mtdev "name" # return (output) the character device name for flash parition "name" # /proc/mtd has the general form: # dev: size erasesize name # mtd5: 00020000 00020000 "FIS directory" # use this rather than hard-wiring the device because the partition # table can change - looking in /proc/mtd is more reliable. mtdev(){ sed -n 's!^\(mtd[0-9][0-9]*\):[^"]*"'"$1"'"$!/dev/\1!p' /proc/mtd } # # mtblockdev "name" # as mtdev but output the name of the block (not character) device mtblockdev(){ sed -n 's!^mtd\([0-9][0-9]*\):[^"]*"'"$1"'"$!/dev/mtdblock\1!p' /proc/mtd } # # mtsize "name" # the size of the partition as a hexadecimal value (with 0x at the front) mtsize(){ sed -n 's!^mtd[0-9][0-9]*: \([^ ]*\)[^"]*"'"$1"'"$!0x\1!p' /proc/mtd } # # sysvalmatch "section" "name" 'pattern' "configuration file" # sysvalof "section" "name" "configuration file" # sysval "section" "name" # outputs the value of the SysConf variable 'name' from section 'section', # this is a bit gross, when it gets a match it copies the value to the # hold space, if no match it jumps over the copy, at the end ($) it copies # the hold space to the pattern space and prints the result, thus it only # ever prints the last match # BUG FIX: busybox sed doesn't initialise the hold space and crashes if it # is used before initialisation, so temporarily this script does it's own # tail by hand. # NOTE: these functions should only be used internally, add entries to 'config' # below if necessary. This is because 'config' does the defaulting and in the # recovering case (zero or absent SysConf) /etc/default/sysconf only contains # the hw_addr entry! sysvalmatch(){ # sed -n '/^\['"$1"'\]$/,/^\[.*\]$/s/^'"$2"'=\('"$3"'\)$/\1/;tH;bE;:H;h;:E;$g;$p' "$4" sed -n '/^\['"$1"'\]$/,/^\[.*\]$/s/^'"$2"'=\('"$3"'\)$/\1/p' "$4" | sed -n '$p' } sysvalof(){ sysvalmatch "$1" "$2" '.*' "$3" } sysval(){ sysvalof "$1" "$2" /etc/default/sysconf } # # config "value" # convenience callers for specific values to avoid mis-typing in scripts # NOTE: this function does the defaulting, 'sysval' does not! Validity # of the sysconf file is determined by the presence of the all important # hw_addr. config(){ local mac mac= test -r /etc/default/sysconf && mac="$(sysvalmatch network hw_addr '[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]' /etc/default/sysconf)" if test -n "$mac" then case "$1" in mac) echo "$mac";; host) if test -n "$(sysval network disk_server_name)" then sysval network disk_server_name elif test -n "$(sysval network default_server_name)" then sysval network default_server_name else echo "$mac" | sed -n 's/^..:..:..:\(..\):\(..\):\(..\)$/LKG\1\2\3/p' fi;; domain) sysval network w_d_name;; iface) if test -n "$(sysval network lan_interface)" then sysval network lan_interface else echo eth0 fi;; ip) if test -n "$(sysval network ip_addr)" then sysval network ip_addr else echo 192.168.1.77 fi;; netmask)sysval network netmask;; gateway)sysval network gateway;; dns) sysval network dns_server1;; dns2) sysval network dns_server2;; dns3) sysval network dns_server3;; boot) if test -n "$(sysval network bootproto)" then sysval network bootproto else echo dhcp fi;; valid) return 0;; *) return 1;; esac else # These are the defaults for an invalid mac address, use the compiled # in hardware address. case "$1" in mac) echo "00:02:B3:02:02:01";; host) echo "brokenslug";; iface) echo eth0;; ip) echo 192.168.1.77;; boot) echo dhcp;; *) return 1;; esac fi } # # checkif "iface" # Validate an interface name by making sure that it exists # in /proc/net/dev (and is not lo). The listing outputs the # interface followed by a :, the check function looks for # something of the form '$1[a-zA-Z0-9]*:' and outputs the # part preceding the ':' checkif(){ sed -n '/^[ ]*lo:/d;s/^[ ]*\('"$1"'[a-zA-Z0-9]*\):.*$/\1/p;tE;d;:E;q' /proc/net/dev } # # checkmount "mountpoint" # tests an already mounted mountpoint to see whether to attempt to # boot with this as root. Returns success if it appears ok. checkmount(){ # basic test for init (the kernel will try to load this) # but require a shell in bin/sh and no .recovery too test \( ! -f "$1/.recovery" \) -a \ \( -d "$1/initrd" -o -d "$1/mnt" \) -a \ \( -x "$1/bin/sh" -o -h "$1/bin/sh" \) -a \ \( -x "$1/sbin/init" -o -h "$1/sbin/init" -o \ -x "$1/etc/init" -o -h "$1/etc/init" -o \ -x "$1/bin/init" -o -h "$1/bin/init" \) } # # swivel "new root" "old root" # NOTE: the arguments must be paths relative to /, bad things # will happen if the arguments themselves start with / # Pivot to a new root. This does all the fancy pivot_root stuff # including closing streams and does a umount /proc - it doesn't # matter if this fails (failure codes are ignored), but if /proc # was mounted it must be restored by the caller on return. # Normally this function never returns! # On return 0,1,2 are connected to /dev/console - this may not # have been true before! swivel() { cd "$1" exec <&- >&- 2>&- # This is just-in-case the called mounted /proc and was # unable to close it because of the streams umount /proc 2>/dev/null if pivot_root . "$2" then # everything must move out of the old root, this process # is $2/bin/sh so it must die, IO is redirected # just in case - typically it will be to a device so it # won't hold the old root open. # the exec here is the first point at which the old root # is unused - before the exec regardless of the close of # 0,1,2 above ash still has *this* shell script open! # (it's on fd 10). # init closes all file descriptors, there's no point # supplying it with fds. exec "$2/usr/sbin/chroot" . bin/sh -c "\ test -x sbin/init && exec sbin/init test -x etc/init && exec etc/init test -x bin/init && exec bin/init leds -A +gr1 '!g1' sleep 10 >/.recovery sync;sync;sync exit 1" fi # # recovery - must restore the old root cd "$2" sbin/pivot_root . "$1" # cd is back to $1 - either pivot_root doesn't change it and the # chroot above was not executed, or pivot_root does change it and # has just changed it back! exec <>/dev/console >&0 2>&0 } # # ifup "interface" # bring that interface up with the configured ip and other # information ifup(){ local ip hostname router subnet iface HOSTNAME NETMASK BROADCAST iface="$1" ip="$(config ip)" hostname="$(config host)" router="$(config gateway)" broadcast= if test -n "$ip" then # only if an ip was specified subnet="$(config netmask)" else ip=192.168.1.77 fi # First try udhcpc - note that the /boot/udhcpc.script # simply records the values returned and the udhcpc # is not left running so this will only work for # the lease length time! ifconfig "$iface" up if test "$(config boot)" != static then test -n "$hostname" && HOSTNAME="-H $hostname" # The script writes the required shell variable assignments # to file descriptor 9 eval $(udhcpc -i "$iface" -n -q -r "$ip" $HOSTNAME -s /boot/udhcpc.script 9>&1 >/dev/null) fi test -n "$broadcast" && BROADCAST="broadcast $broadcast" test -n "$subnet" && NETMASK="netmask $subnet" if ifconfig "$iface" "$ip" $NETMASK $BROADCAST then for route in $router do route add default gw "$route" dev "$iface" done return 0 else ifconfig "$iface" down return 1 fi } # # ifdown "interface" # take the interface down ifdown(){ ifconfig "$1" down } # # mountflash "flash device" "flash root directory" {mount options} # Finds and mounts the flash file system on the given directory mountflash() { local ffsdev ffsdir ffsdev="$1" test -n "$ffsdev" -a -b "$ffsdev" || { echo "$0: unable to find flash file system to copy ($ffsdev)" >&2 return 1 } shift ffsdir="$1" test -n "$ffsdir" -a -d "$ffsdir" || { echo "$0: mountflash $ffsdir: not a directory (internal error)" >&2 return 1 } shift mount -t jffs2 "$@" "$ffsdev" "$ffsdir" || { echo "$0: $ffsdev: unable to mount flash file system on $ffsdir" >&2 return 1 } return 0 } # # umountflash [-r] "flash device" # unmount any instance of the given flash device, if -r is specified a mount on # root is an error, otherwise a mount on root is ignored (and remains). umountflash() { local rootok ffsno ffsdev rootok=1 case "$1" in -r) rootok= shift;; esac # # The argument is ffsdev ffsdev="$1" ffsno="$(devio "<<$ffsdev" prd)" test -n "$ffsno" -a "$ffsno" -ge 0 || { echo "$0: $ffsdev: device number $ffsno is not valid, cannot continue." >&2 return 1 } # # Make sure that Flashdisk isn't mounted on / if test -z "$rootok" -a "$(devio "<&2 return 1 fi # # The function is currently always used interactively, so output echo "$0: umounting any existing mount of $ffsdev" >&2 # # check each mount point, do this last first because otherwise nested # mounts of ffsdev cannot be umounted. ffs_umount() { local device mp type options stuff read device mp type options stuff test -z "$device" && return 0 # handle following entries first ffs_umount || return 1 # handle this entry, since this is currently only used for unmounting # the flash root partition we know a file which must exist... case "$mp/$type" in //jffs2);; # skip / */jffs2)test "$(devio "<<$mp/etc/init.d/sysconfsetup" prd 2>/dev/null)" -ne "$ffsno" || umount "$mp" || { echo "$0: $mp: unable to umount $ffsdev" >&2 return 1 };; esac return 0 } # ffs_umount &2 return 1 } return 0 }