#! /usr/bin/env tclsh
package require http 2.7
package require sqlite3
package require sha1
package require appfsd
package require platform
package require pki
# Functions specifically meant for users to replace as a part of configuration
namespace eval ::appfs::user {
# User-replacable function to convert a hostname/hash/method to an URL
proc construct_url {hostname hash method} {
return "http://$hostname/appfs/$method/$hash"
}
# User-replaceable function get the home directory of the current user
proc get_homedir {} {
return [::appfsd::get_homedir]
}
}
namespace eval ::appfs {
variable cachedir "/tmp/appfs-cache"
variable ttl 3600
variable nttl 60
variable trusted_cas [list]
proc _hash_sep {hash {seps 4}} {
for {set idx 0} {$idx < $seps} {incr idx} {
append retval "[string range $hash [expr {$idx * 2}] [expr {($idx * 2) + 1}]]/"
}
append retval "[string range $hash [expr {$idx * 2}] end]"
return $retval
}
proc _cachefile {url key {keyIsHash 1}} {
set filekey $key
if {$keyIsHash} {
set filekey [_hash_sep $filekey]
}
set file [file join $::appfs::cachedir $filekey]
file mkdir [file dirname $file]
if {[file exists $file]} {
return $file
}
set tmpfile "${file}.[expr {rand()}][clock clicks]"
set fd [open $tmpfile "w"]
fconfigure $fd -translation binary
catch {
set token [::http::geturl $url -channel $fd -binary true]
}
if {[info exists token]} {
set ncode [::http::ncode $token]
::http::reset $token
} else {
set ncode "900"
}
close $fd
if {$keyIsHash} {
set hash [string tolower [sha1::sha1 -hex -file $tmpfile]]
} else {
set hash $key
}
if {$ncode == "200" && $hash == $key} {
file rename -force -- $tmpfile $file
} else {
file delete -force -- $tmpfile
}
return $file
}
proc _isHash {value} {
set value [string tolower $value]
if {[string length $value] != 40} {
return false
}
if {![regexp {^[0-9a-f]*$} $value]} {
return false
}
return true
}
proc _verifySignatureAndCertificate {hostname certificate signature hash} {
set certificate [binary format "H*" $certificate]
set signature [binary format "H*" $signature]
set certificate [::pki::x509::parse_cert $certificate]
array set certificate_arr $certificate
set certificate_cn [::pki::x509::_dn_to_cn $certificate_arr(subject)]
if {![::pki::verify $signature "$hash,sha1" $certificate]} {
return false
}
if {[string tolower $certificate_cn] != [string tolower $hostname]} {
return false
}
if {![::pki::x509::verify_cert $certificate $::appfs::trusted_cas]} {
return false
}
return true
}
proc _normalizeOS {os} {
set os [string tolower [string trim $os]]
switch -- $os {
"linux" - "freebsd" - "openbsd" - "netbsd" {
return $os
}
"sunos" {
return "solaris"
}
"noarch" - "none" - "any" - "all" {
return "noarch"
}
}
return -code error "Unable to normalize OS: $os"
}
proc _normalizeCPU {cpu} {
set cpu [string tolower [string trim $cpu]]
switch -glob -- $cpu {
"i?86" {
return "ix86"
}
"x86_64" {
return $cpu
}
"noarch" - "none" - "any" - "all" {
return "noarch"
}
}
return -code error "Unable to normalize CPU: $cpu"
}
proc _as_user {code} {
::appfsd::simulate_user_fs_enter
set retcode [catch [list uplevel $code] retstr]
::appfsd::simulate_user_fs_leave
return -code $retcode $retstr
}
proc init {} {
if {[info exists ::appfs::init_called]} {
return
}
# Force [parray] and [clock] to be loaded
catch {
parray does_not_exist
}
catch {
clock seconds
}
catch {
clock add [clock seconds] 3 seconds
}
set ::appfs::init_called 1
# Add a default CA to list of trusted CAs
lappend ::appfs::trusted_cas [::pki::x509::parse_cert {
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
}]
# Load configuration file
set config_file [file join $::appfs::cachedir config]
if {[file exists $config_file]} {
source $config_file
}
if {![info exists ::appfs::db]} {
file mkdir $::appfs::cachedir
sqlite3 ::appfs::db [file join $::appfs::cachedir cache.db]
::appfs::db timeout 30000
}
# Create tables
db eval {CREATE TABLE IF NOT EXISTS sites(hostname PRIMARY KEY, lastUpdate, ttl);}
db eval {CREATE TABLE IF NOT EXISTS packages(hostname, sha1, package, version, os, cpuArch, isLatest, haveManifest);}
db eval {CREATE TABLE IF NOT EXISTS files(package_sha1, type, time, source, size, perms, file_sha1, file_name, file_directory);}
# Create indexes
db eval {CREATE INDEX IF NOT EXISTS sites_index ON sites (hostname);}
db eval {CREATE INDEX IF NOT EXISTS packages_index ON packages (hostname, sha1, package, version, os, cpuArch);}
db eval {CREATE INDEX IF NOT EXISTS files_index ON files (package_sha1, file_name, file_directory);}
}
proc download {hostname hash {method sha1}} {
set url [::appfs::user::construct_url $hostname $hash $method]
set file [_cachefile $url $hash]
if {![file exists $file]} {
return -code error "Unable to fetch (file does not exist: $file)"
}
return $file
}
proc getindex {hostname} {
set now [clock seconds]
set lastUpdates [db eval {SELECT lastUpdate, ttl FROM sites WHERE hostname = $hostname LIMIT 1;}]
if {[llength $lastUpdates] == 0} {
set lastUpdate 0
set ttl 0
} else {
set lastUpdate [lindex $lastUpdates 0]
set ttl [lindex $lastUpdates 1]
}
if {$now < ($lastUpdate + $ttl)} {
return COMPLETE
}
if {[string match "*\[/~\]*" $hostname]} {
return -code error "Invalid hostname"
}
set url "http://$hostname/appfs/index"
catch {
set token [::http::geturl $url]
if {[::http::ncode $token] == "200"} {
set indexhash_data [::http::data $token]
}
::http::reset $token
::http::cleanup $token
}
if {![info exists indexhash_data]} {
# Cache this result for 60 seconds
db eval {INSERT OR REPLACE INTO sites (hostname, lastUpdate, ttl) VALUES ($hostname, $now, $::appfs::nttl);}
return -code error "Unable to fetch $url"
}
set indexhash_data [string trim $indexhash_data "\r\n"]
set indexhash_data [split $indexhash_data ","]
set indexhash [lindex $indexhash_data 0]
set indexhashmethod [lindex $indexhash_data 1]
set indexhashcert [lindex $indexhash_data 2]
set indexhashsig [lindex $indexhash_data 3]
if {![_isHash $indexhash]} {
return -code error "Invalid hash: $indexhash"
}
if {![_verifySignatureAndCertificate $hostname $indexhashcert $indexhashsig $indexhash]} {
return -code error "Invalid signature or certificate from $hostname"
}
set file [download $hostname $indexhash]
set fd [open $file]
set data [read $fd]
close $fd
set curr_packages [list]
foreach line [split $data "\n"] {
set line [string trim $line]
if {[string match "*/*" $line]} {
continue
}
if {$line == ""} {
continue
}
set work [split $line ","]
unset -nocomplain pkgInfo
if {[catch {
set pkgInfo(package) [lindex $work 0]
set pkgInfo(version) [lindex $work 1]
set pkgInfo(os) [_normalizeOS [lindex $work 2]]
set pkgInfo(cpuArch) [_normalizeCPU [lindex $work 3]]
set pkgInfo(hash) [string tolower [lindex $work 4]]
set pkgInfo(hash_type) "sha1"
set pkgInfo(isLatest) [expr {!![lindex $work 5]}]
}]} {
continue
}
if {![_isHash $pkgInfo(hash)]} {
continue
}
lappend curr_packages $pkgInfo(hash)
# Do not do any additional work if we already have this package
set existing_packages [db eval {SELECT package FROM packages WHERE hostname = $hostname AND sha1 = $pkgInfo(hash);}]
if {[lsearch -exact $existing_packages $pkgInfo(package)] != -1} {
continue
}
if {$pkgInfo(isLatest)} {
db eval {UPDATE packages SET isLatest = 0 WHERE hostname = $hostname AND package = $pkgInfo($package) AND os = $pkgInfo($package) AND cpuArch = $pkgInfo(cpuArch);}
}
db eval {INSERT INTO packages (hostname, sha1, package, version, os, cpuArch, isLatest, haveManifest) VALUES ($hostname, $pkgInfo(hash), $pkgInfo(package), $pkgInfo(version), $pkgInfo(os), $pkgInfo(cpuArch), $pkgInfo(isLatest), 0);}
}
# Look for packages that have been deleted
set found_packages [db eval {SELECT sha1 FROM packages WHERE hostname = $hostname;}]
foreach package $found_packages {
set found_packages_arr($package) 1
}
foreach package $curr_packages {
unset -nocomplain found_packages_arr($package)
}
foreach package [array names found_packages_arr] {
db eval {DELETE FROM packages WHERE hostname = $hostname AND sha1 = $package;}
}
db eval {INSERT OR REPLACE INTO sites (hostname, lastUpdate, ttl) VALUES ($hostname, $now, $::appfs::ttl);}
appfsd::get_path_info_cache_flush
return COMPLETE
}
proc getpkgmanifest {hostname package_sha1} {
set haveManifest [db onecolumn {SELECT haveManifest FROM packages WHERE sha1 = $package_sha1 LIMIT 1;}]
if {$haveManifest == "1"} {
return COMPLETE
}
if {![_isHash $package_sha1]} {
return FAIL
}
set file [download $hostname $package_sha1]
set fd [open $file]
set pkgdata [read $fd]
close $fd
db transaction {
foreach line [split $pkgdata "\n"] {
set line [string trim $line]
if {$line == ""} {
continue
}
set work [split $line ","]
unset -nocomplain fileInfo
set fileInfo(type) [lindex $work 0]
set fileInfo(time) [lindex $work 1]
set work [lrange $work 2 end]
switch -- $fileInfo(type) {
"#manifestmetadata" {
unset -nocomplain fileInfo
continue
}
"file" {
set fileInfo(size) [lindex $work 0]
set fileInfo(perms) [lindex $work 1]
set fileInfo(sha1) [lindex $work 2]
set work [lrange $work 3 end]
}
"symlink" {
set fileInfo(source) [lindex $work 0]
set work [lrange $work 1 end]
}
"directory" {
# No extra data required
}
default {
# Handle unknown types
if {[string index $fileInfo(type) 0] == "#"} {
# Metadata type, ignore
# it if we don't
# understand this type
continue
} else {
# Unknown type,
# generate an error
error "Manifest cannot be parsed"
}
}
}
set fileInfo(name) [join $work ","]
set fileInfo(name) [split [string trim $fileInfo(name) "/"] "/"]
set fileInfo(directory) [join [lrange $fileInfo(name) 0 end-1] "/"]
set fileInfo(name) [lindex $fileInfo(name) end]
db eval {INSERT INTO files (package_sha1, type, time, source, size, perms, file_sha1, file_name, file_directory) VALUES ($package_sha1, $fileInfo(type), $fileInfo(time), $fileInfo(source), $fileInfo(size), $fileInfo(perms), $fileInfo(sha1), $fileInfo(name), $fileInfo(directory) );}
db eval {UPDATE packages SET haveManifest = 1 WHERE sha1 = $package_sha1;}
}
}
appfsd::get_path_info_cache_flush
return COMPLETE
}
proc _localpath {package hostname file} {
set dir ""
catch {
set homedir [::appfs::user::get_homedir]
set dir [file join $homedir .appfs "./${package}@${hostname}" "./${file}"]
}
return $dir
}
proc _whiteoutpath {package hostname file} {
set dir ""
catch {
set homedir [::appfs::user::get_homedir]
set dir [file join $homedir .appfs "./${package}@${hostname}" ".APPFS.WHITEOUT" "./${file}.APPFS.WHITEOUT"]
}
return $dir
}
proc _parsepath {path} {
set path [string trim $path "/"]
set path [split $path "/"]
set pathlen [llength $path]
array set retval [list _children sites _type toplevel]
if {$pathlen > 0} {
set retval(hostname) [lindex $path 0]
set retval(_children) packages
set retval(_type) sites
if {$pathlen > 1} {
set package [lindex $path 1]
if {[string length $package] == "40" && [regexp {^[a-fA-F0-9]*$} $package]} {
set retval(package_sha1) $package
set retval(_children) files
set retval(_type) files
::appfs::db eval {SELECT package, os, cpuArch, version FROM packages WHERE sha1 = $retval(package_sha1);} pkginfo {}
set retval(package) $pkginfo(package)
set retval(os) $pkginfo(os)
set retval(cpu) $pkginfo(cpuArch)
set retval(version) $pkginfo(version)
if {$pathlen > 2} {
set retval(file) [join [lrange $path 2 end] "/"]
} else {
set retval(file) ""
}
} else {
set retval(package) $package
set retval(_children) os-cpu
set retval(_type) packages
if {$pathlen > 2} {
set os_cpu [lindex $path 2]
set os_cpu [split $os_cpu "-"]
set retval(os) [lindex $os_cpu 0]
set retval(cpu) [lindex $os_cpu 1]
set retval(_children) versions
set retval(_type) os-cpu
if {$pathlen > 3} {
set retval(version) [lindex $path 3]
set retval(_children) files
set retval(_type) versions
set retval(package_sha1) [::appfs::db onecolumn {SELECT sha1 FROM packages WHERE hostname = $retval(hostname) AND package = $retval(package) AND os = $retval(os) AND cpuArch = $retval(cpu) AND version = $retval(version);}]
if {$retval(package_sha1) == ""} {
set retval(_children) dead
return [array get retval]
}
if {$pathlen > 4} {
set retval(_type) files
set retval(file) [join [lrange $path 4 end] "/"]
} else {
set retval(_type) files
set retval(file) ""
}
}
}
}
}
}
return [array get retval]
}
proc getchildren {dir} {
array set pathinfo [_parsepath $dir]
switch -- $pathinfo(_children) {
"sites" {
return [::appfs::db eval {SELECT DISTINCT hostname FROM packages;}]
}
"packages" {
catch {
::appfs::getindex $pathinfo(hostname)
}
return [::appfs::db eval {SELECT DISTINCT package FROM packages WHERE hostname = $pathinfo(hostname);}]
}
"os-cpu" {
set retval [::appfs::db eval {SELECT DISTINCT os || "-" || cpuArch FROM packages WHERE hostname = $pathinfo(hostname) AND package = $pathinfo(package);}]
lappend retval "platform"
return $retval
}
"versions" {
set retval [::appfs::db eval {
SELECT DISTINCT version FROM packages WHERE hostname = $pathinfo(hostname) AND package = $pathinfo(package) AND os = $pathinfo(os) AND cpuArch = $pathinfo(cpu);
}]
::appfs::db eval {SELECT version FROM packages WHERE isLatest = 1 AND hostname = $pathinfo(hostname) AND package = $pathinfo(package) AND os = $pathinfo(os) AND cpuArch = $pathinfo(cpu) LIMIT 1;} latest_info {}
if {[info exists latest_info(version)]} {
lappend retval "latest"
}
return $retval
}
"files" {
catch {
::appfs::getindex $pathinfo(hostname)
::appfs::getpkgmanifest $pathinfo(hostname) $pathinfo(package_sha1)
}
set retval [::appfs::db eval {SELECT DISTINCT file_name FROM files WHERE package_sha1 = $pathinfo(package_sha1) AND file_directory = $pathinfo(file);}]
if {[info exists pathinfo(package)] && [info exists pathinfo(hostname)] && [info exists pathinfo(file)]} {
_as_user {
set dir [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]
set whiteoutdir [string range [_whiteoutpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)] 0 end-15]
if {$whiteoutdir != ""} {
foreach file [glob -nocomplain -tails -directory $whiteoutdir {{.,}*.APPFS.WHITEOUT}] {
set remove [string range $file 0 end-15]
set idx [lsearch -exact $retval $remove]
if {$idx != -1} {
set retval [lreplace $retval $idx $idx]
}
}
}
if {$dir != ""} {
foreach file [glob -nocomplain -tails -directory $dir {{.,}*}] {
if {$file == "." || $file == ".."} {
continue
}
if {$file == ".APPFS.WHITEOUT"} {
continue
}
if {[lsearch -exact $retval $file] != -1} {
continue
}
lappend retval $file
}
}
}
}
return $retval
}
}
return -code error "Invalid or unacceptable path: $dir"
}
proc getattr {path} {
array set pathinfo [_parsepath $path]
array set retval [list]
catch {
::appfs::getindex $pathinfo(hostname)
::appfs::getpkgmanifest $pathinfo(hostname) $pathinfo(package_sha1)
}
switch -- $pathinfo(_type) {
"toplevel" {
set retval(type) directory
set retval(childcount) [llength [getchildren $path]]
}
"sites" {
set check [::appfs::db onecolumn {SELECT 1 FROM packages WHERE hostname = $pathinfo(hostname);}]
if {$check == "1"} {
set retval(type) directory
set retval(childcount) [llength [getchildren $path]]
}
}
"packages" {
set check [::appfs::db onecolumn {SELECT 1 FROM packages WHERE hostname = $pathinfo(hostname) AND package = $pathinfo(package);}]
if {$check == "1"} {
set retval(type) directory
set retval(childcount) [llength [getchildren $path]]
}
}
"os-cpu" {
if {$pathinfo(os) == "platform" && $pathinfo(cpu) == ""} {
set retval(type) symlink
set retval(source) [platform::generic]
} else {
set check [::appfs::db onecolumn {
SELECT 1 FROM packages WHERE hostname = $pathinfo(hostname) AND package = $pathinfo(package) AND os = $pathinfo(os) AND cpuArch = $pathinfo(cpu);
}]
if {$check == "1"} {
set retval(type) directory
set retval(childcount) [llength [getchildren $path]]
}
}
}
"versions" {
if {$pathinfo(version) == "latest"} {
::appfs::db eval {SELECT version FROM packages WHERE isLatest = 1 AND hostname = $pathinfo(hostname) AND package = $pathinfo(package) AND os = $pathinfo(os) AND cpuArch = $pathinfo(cpu) LIMIT 1;} latest_info {}
if {[info exists latest_info(version)]} {
set retval(type) symlink
set retval(source) $latest_info(version)
}
} else {
if {[info exists pathinfo(package_sha1)] && $pathinfo(package_sha1) != ""} {
set retval(type) directory
set retval(childcount) [llength [getchildren $path]]
}
}
}
"files" {
set retval(packaged) 1
set localpath [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]
set whiteoutpath [_whiteoutpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]
set retval(localpath) $localpath
set retval(whiteoutpath) $whiteoutpath
unset -nocomplain localpathinfo
if {$localpath != ""} {
_as_user {
catch {
file lstat $localpath localpathinfo
}
}
}
if {$localpath != "" && [info exists localpathinfo]} {
set retval(is_localfile) 1
catch {
set retval(time) $localpathinfo(mtime)
switch -- $localpathinfo(type) {
"directory" {
set retval(type) "directory"
set retval(childcount) [llength [getchildren $path]]
}
"file" {
set retval(type) "file"
set retval(size) $localpathinfo(size)
_as_user {
if {[file executable $localpath]} {
set retval(perms) "x"
} else {
set retval(perms) ""
}
}
}
"link" {
set retval(type) "symlink"
_as_user {
set retval(source) [file readlink $localpath]
}
}
"fifo" {
# Capitalized so that the first char is unique
set retval(type) "Fifo"
}
"socket" {
# Capitalized so that the first char is unique
set retval(type) "Socket"
}
}
} err
} else {
if {$whiteoutpath == "" || ![file exists $whiteoutpath]} {
set retval(is_remotefile) 1
set work [split $pathinfo(file) "/"]
set directory [join [lrange $work 0 end-1] "/"]
set file [lindex $work end]
if {$directory == "" && $file == ""} {
array set retval [list type directory]
}
::appfs::db eval {SELECT type, time, source, size, perms FROM files WHERE package_sha1 = $pathinfo(package_sha1) AND file_directory = $directory AND file_name = $file;} retval {}
if {[info exists retval(type)] && $retval(type) == "directory"} {
set retval(childcount) [llength [getchildren $path]]
}
unset -nocomplain retval(*)
}
}
}
}
if {![info exists retval(type)]} {
return -code error "No such file or directory"
}
return [array get retval]
}
proc openpath {path mode} {
array set pathinfo [_parsepath $path]
if {$pathinfo(_type) != "files"} {
return -code error "invalid type"
}
set localpath [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]
if {$mode == "create"} {
if {$localpath == ""} {
return -code error "Asked to create, but no home directory."
}
return $localpath
}
if {$localpath != "" && [file exists $localpath]} {
return $localpath
}
set work [split $pathinfo(file) "/"]
set directory [join [lrange $work 0 end-1] "/"]
set file [lindex $work end]
::appfs::db eval {SELECT file_sha1, perms FROM files WHERE package_sha1 = $pathinfo(package_sha1) AND file_name = $file AND file_directory = $directory;} pkgpathinfo {}
if {$pkgpathinfo(file_sha1) == ""} {
return -code error "No such file or directory"
}
set localcachefile [download $pathinfo(hostname) $pkgpathinfo(file_sha1)]
if {$mode == "write"} {
_as_user {
set tmplocalpath "${localpath}.[expr rand()][clock clicks]"
set failed 0
if {[catch {
file mkdir [file dirname $localpath]
file copy -force -- $localcachefile $tmplocalpath
if {$pkgpathinfo(perms) == "x"} {
file attributes $tmplocalpath -permissions +x
}
file rename -force -- $tmplocalpath $localpath
} err]} {
set failed 1
}
catch {
file delete -force -- $tmplocalpath
}
}
if {$failed} {
return -code error $err
}
return $localpath
}
return $localcachefile
}
proc localpath {path} {
array set pathinfo [_parsepath $path]
if {$pathinfo(_type) != "files"} {
return -code error "invalid type"
}
set localpath [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]
return $localpath
}
proc exists {path} {
catch {
set info [getattr $path]
} err
if {![info exists info]} {
if {$err == "No such file or directory"} {
return [list]
} else {
return -code error $err
}
}
return $info
}
proc prepare_to_create {path {must_not_exist 1}} {
if {$must_not_exist} {
if {[exists $path] != ""} {
return -code error "File already exists"
}
}
set filename [localpath $path]
if {$filename == ""} {
return -code error "Asked to create, but no home directory."
}
set dirname [file dirname $filename]
_as_user {
file mkdir $dirname
}
return $filename
}
proc unlinkpath {path} {
array set pathattrs [exists $path]
if {![info exists pathattrs(packaged)]} {
return -code error "invalid type"
}
set localpath $pathattrs(localpath)
if {$localpath == ""} {
return -code error "Asked to delete, but no home directory."
}
if {[info exists pathattrs(is_localfile)]} {
if {[file isdirectory $localpath]} {
set children [getchildren $path]
if {[llength $children] != 0} {
return -code error "Asked to delete non-empty directory"
}
}
_as_user {
file delete -force -- $localpath
}
} elseif {[info exists pathattrs(is_remotefile)]} {
if {$pathattrs(type) == "directory"} {
set children [getchildren $path]
if {[llength $children] != 0} {
return -code error "Asked to delete non-empty directory"
}
}
} else {
return -code error "Unknown if file is remote or local !?"
}
set whiteoutfile $pathattrs(whiteoutpath)
set whiteoutdir [file dirname $whiteoutfile]
_as_user {
file mkdir $whiteoutdir
close [open $whiteoutfile w]
}
}
}