234 lines
6.2 KiB
Tcl
234 lines
6.2 KiB
Tcl
# 2010 January 7
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements utility functions for SQLite library.
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#
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# This file attempts to restore the header of a journal.
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# This may be useful for rolling-back the last committed
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# transaction from a recovered journal.
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#
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package require sqlite3
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set parm_error 0
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set fix_chksums 0
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set dump_pages 0
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set db_name ""
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for {set i 0} {$i<$argc} {incr i} {
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if {[lindex $argv $i] == "-fix_chksums"} {
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set fix_chksums -1
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} elseif {[lindex $argv $i] == "-dump_pages"} {
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set dump_pages -1
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} elseif {$db_name == ""} {
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set db_name [lindex $argv $i]
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set jrnl_name $db_name-journal
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} else {
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set parm_error -1
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}
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}
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if {$parm_error || $db_name == ""} {
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puts "USAGE: restore_jrnl.tcl \[-fix_chksums\] \[-dump_pages\] db_name"
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puts "Example: restore_jrnl.tcl foo.sqlite"
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return
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}
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# is there a way to determine this?
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set sectsz 512
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# Copy file $from into $to
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#
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proc copy_file {from to} {
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file copy -force $from $to
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}
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# Execute some SQL
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#
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proc catchsql {sql} {
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set rc [catch {uplevel [list db eval $sql]} msg]
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list $rc $msg
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}
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# Perform a test
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#
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proc do_test {name cmd expected} {
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puts -nonewline "$name ..."
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set res [uplevel $cmd]
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if {$res eq $expected} {
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puts Ok
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} else {
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puts Error
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puts " Got: $res"
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puts " Expected: $expected"
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}
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}
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# Calc checksum nonce from journal page data.
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#
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proc calc_nonce {jrnl_pgno} {
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global sectsz
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global db_pgsz
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global jrnl_name
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set jrnl_pg_offset [expr $sectsz+((4+$db_pgsz+4)*$jrnl_pgno)]
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set nonce [hexio_get_int [hexio_read $jrnl_name [expr $jrnl_pg_offset+4+$db_pgsz] 4]]
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for {set i [expr $db_pgsz-200]} {$i>0} {set i [expr $i-200]} {
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set byte [hexio_get_int [hexio_read $jrnl_name [expr $jrnl_pg_offset+4+$i] 1]]
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set nonce [expr $nonce-$byte]
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}
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return $nonce
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}
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# Calc checksum from journal page data.
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#
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proc calc_chksum {jrnl_pgno} {
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global sectsz
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global db_pgsz
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global jrnl_name
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global nonce
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set jrnl_pg_offset [expr $sectsz+((4+$db_pgsz+4)*$jrnl_pgno)]
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set chksum $nonce
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for {set i [expr $db_pgsz-200]} {$i>0} {set i [expr $i-200]} {
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set byte [hexio_get_int [hexio_read $jrnl_name [expr $jrnl_pg_offset+4+$i] 1]]
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set chksum [expr $chksum+$byte]
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}
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return $chksum
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}
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# Print journal page data in hex dump form
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#
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proc dump_jrnl_page {jrnl_pgno} {
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global sectsz
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global db_pgsz
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global jrnl_name
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# print a header block for the page
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puts [string repeat "-" 79]
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set jrnl_pg_offset [expr $sectsz+((4+$db_pgsz+4)*$jrnl_pgno)]
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set db_pgno [hexio_get_int [hexio_read $jrnl_name [expr $jrnl_pg_offset] 4]]
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set chksum [hexio_get_int [hexio_read $jrnl_name [expr $jrnl_pg_offset+4+$db_pgsz] 4]]
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set nonce [calc_nonce $jrnl_pgno]
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puts [ format {jrnl_pg_offset: %08x (%d) jrnl_pgno: %d db_pgno: %d} \
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$jrnl_pg_offset $jrnl_pg_offset \
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$jrnl_pgno $db_pgno]
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puts [ format {nonce: %08x chksum: %08x} \
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$nonce $chksum]
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# now hex dump the data
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# This is derived from the Tcler's WIKI
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set fid [open $jrnl_name r]
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fconfigure $fid -translation binary -encoding binary
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seek $fid [expr $jrnl_pg_offset+4]
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set data [read $fid $db_pgsz]
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close $fid
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for {set addr 0} {$addr<$db_pgsz} {set addr [expr $addr+16]} {
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# get 16 bytes of data
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set s [string range $data $addr [expr $addr+16]]
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# Convert the data to hex and to characters.
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binary scan $s H*@0a* hex ascii
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# Replace non-printing characters in the data.
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regsub -all -- {[^[:graph:] ]} $ascii {.} ascii
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# Split the 16 bytes into two 8-byte chunks
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regexp -- {(.{16})(.{0,16})} $hex -> hex1 hex2
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# Convert the hex to pairs of hex digits
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regsub -all -- {..} $hex1 {& } hex1
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regsub -all -- {..} $hex2 {& } hex2
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# Print the hex and ascii data
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puts [ format {%08x %-24s %-24s %-16s} \
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$addr $hex1 $hex2 $ascii ]
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}
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}
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# Setup for the tests. Make a backup copy of the files.
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#
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if [file exist $db_name.org] {
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puts "ERROR: during back-up: $db_name.org exists already."
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return;
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}
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if [file exist $jrnl_name.org] {
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puts "ERROR: during back-up: $jrnl_name.org exists already."
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return
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}
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copy_file $db_name $db_name.org
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copy_file $jrnl_name $jrnl_name.org
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set db_fsize [file size $db_name]
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set db_pgsz [hexio_get_int [hexio_read $db_name 16 2]]
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set db_npage [expr {$db_fsize / $db_pgsz}]
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set jrnl_fsize [file size $jrnl_name]
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set jrnl_npage [expr {($jrnl_fsize - $sectsz) / (4 + $db_pgsz + 4)}]
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# calculate checksum nonce for first page
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set nonce [calc_nonce 0]
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# verify all the pages in the journal use the same nonce
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for {set i 1} {$i<$jrnl_npage} {incr i} {
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set tnonce [calc_nonce $i]
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if {$tnonce != $nonce} {
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puts "WARNING: different nonces: 0=$nonce $i=$tnonce"
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if {$fix_chksums } {
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set jrnl_pg_offset [expr $sectsz+((4+$db_pgsz+4)*$i)]
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set tchksum [calc_chksum $i]
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hexio_write $jrnl_name [expr $jrnl_pg_offset+4+$db_pgsz] [format %08x $tchksum]
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puts "INFO: fixing chksum: $i=$tchksum"
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}
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}
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}
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# verify all the page numbers in the journal
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for {set i 0} {$i<$jrnl_npage} {incr i} {
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set jrnl_pg_offset [expr $sectsz+((4+$db_pgsz+4)*$i)]
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set db_pgno [hexio_get_int [hexio_read $jrnl_name $jrnl_pg_offset 4]]
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if {$db_pgno < 1} {
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puts "WARNING: page number < 1: $i=$db_pgno"
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}
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if {$db_pgno >= $db_npage} {
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puts "WARNING: page number >= $db_npage: $i=$db_pgno"
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}
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}
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# dump page data
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if {$dump_pages} {
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for {set i 0} {$i<$jrnl_npage} {incr i} {
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dump_jrnl_page $i
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}
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}
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# write the 8 byte magic string
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hexio_write $jrnl_name 0 d9d505f920a163d7
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# write -1 for number of records
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hexio_write $jrnl_name 8 ffffffff
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# write 00 for checksum nonce
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hexio_write $jrnl_name 12 [format %08x $nonce]
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# write page count
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hexio_write $jrnl_name 16 [format %08x $db_npage]
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# write sector size
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hexio_write $jrnl_name 20 [format %08x $sectsz]
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# write page size
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hexio_write $jrnl_name 24 [format %08x $db_pgsz]
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# check the integrity of the database with the patched journal
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sqlite3 db $db_name
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do_test restore_jrnl-1.0 {
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catchsql {PRAGMA integrity_check}
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} {0 ok}
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db close
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