Hanle multi-pattern match on a single line of log

Makefile

@@ -3,10 +3,10 @@ PREFIX ?= /usr/local
 BINDIR = $(PREFIX)/bin
 SYSTEMDDIR ?= /etc/systemd
 
-all: reaction.linux reaction.freebsd ip46tables nft46
+all: reaction ip46tables nft46
 
 clean:
-	rm -f reaction.linux reaction.freebsd ip46tables nft46 reaction.deb deb reaction.minisig ip46tables.minisig reaction.deb.minisig nft46.minisig
+	rm -f reaction ip46tables nft46 reaction.deb deb reaction.minisig ip46tables.minisig reaction.deb.minisig nft46.minisig
 
 ip46tables: helpers_c/ip46tables.c
 	$(CC) -s -static helpers_c/ip46tables.c -o ip46tables
@@ -14,11 +14,8 @@ ip46tables: helpers_c/ip46tables.c
 nft46: helpers_c/nft46.c
 	$(CC) -s -static helpers_c/nft46.c -o nft46
 
-reaction.linux: app/* reaction.go go.mod go.sum
-	GOOS=linux CGO_ENABLED=0 go build -buildvcs=false -ldflags "-s -X main.version=`git tag --sort=v:refname | tail -n1` -X main.commit=`git rev-parse --short HEAD`" -o reaction.linux
-
-reaction.freebsd: app/* reaction.go go.mod go.sum
-	GOOS=freebsd CGO_ENABLED=0 go build -buildvcs=false -ldflags "-s -X main.version=`git tag --sort=v:refname | tail -n1` -X main.commit=`git rev-parse --short HEAD`" -o reaction.freebsd
+reaction: app/* reaction.go go.mod go.sum
+	CGO_ENABLED=0 go build -buildvcs=false -ldflags "-s -X main.version=`git tag --sort=v:refname | tail -n1` -X main.commit=`git rev-parse --short HEAD`"
 
 reaction.deb: reaction ip46tables nft46
 	chmod +x reaction ip46tables nft46

README.md

@@ -208,10 +208,3 @@ To install the systemd file as well
 ```shell
 make install_systemd
 ```
-
-## Development
-
-Contributions are welcome. For any substantial feature, please file an issue first, to be assured that we agree on the feature, and to avoid unnecessary work.
-
-This is a free time project, so I'm not working on schedule.
-However, if you're willing to fund the project, I can priorise and plan paid work. This includes features, documentation and specific JSONnet configurations.

app/client.go

@@ -20,7 +20,7 @@ const (
 
 type Request struct {
 	Request int
-	Pattern string
+	Pattern []string
 }
 
 type Response struct {
@@ -85,7 +85,7 @@ func usage(err string) {
 }
 
 func ClientShow(format, stream, filter string, regex *regexp.Regexp) {
-	response := SendAndRetrieve(Request{Show, ""})
+	response := SendAndRetrieve(Request{Show, []string{""}})
 	if response.Err != nil {
 		logger.Fatalln("Received error from daemon:", response.Err)
 	}
@@ -166,7 +166,7 @@ func ClientShow(format, stream, filter string, regex *regexp.Regexp) {
 	os.Exit(0)
 }
 
-func ClientFlush(pattern, streamfilter, format string) {
+func ClientFlush(pattern []string, streamfilter, format string) {
 	response := SendAndRetrieve(Request{Flush, pattern})
 	if response.Err != nil {
 		logger.Fatalln("Received error from daemon:", response.Err)

app/daemon.go

@@ -13,6 +13,16 @@ import (
 	"framagit.org/ppom/reaction/logger"
 )
 
+// Compare content and ordering. Case sensitive.
+func IsStringArrayEqual(one, two []string) bool {
+	for i, a := range one {
+		if a != two[i] {
+			return false
+		}
+	}
+	return true
+}
+
 // Executes a command and channel-send its stdout
 func cmdStdout(commandline []string) chan *string {
 	lines := make(chan *string)
@@ -77,44 +87,53 @@ func (p *Pattern) notAnIgnore(match *string) bool {
 }
 
 // Whether one of the filter's regexes is matched on a line
-func (f *Filter) match(line *string) string {
+func (f *Filter) match(line *string) []string {
+	var result []string
 	for _, regex := range f.compiledRegex {
 
 		if matches := regex.FindStringSubmatch(*line); matches != nil {
+			var pnames []string
+			for _, p := range f.pattern {
+				pnames = append(pnames, p.name)
+			}
 
-			if f.pattern != nil {
-				match := matches[regex.SubexpIndex(f.pattern.name)]
-
-				if f.pattern.notAnIgnore(&match) {
+			for _, p := range f.pattern {
+				match := matches[regex.SubexpIndex(p.name)]
+				if p.notAnIgnore(&match) {
 					logger.Printf(logger.INFO, "%s.%s: match [%v]\n", f.stream.name, f.name, match)
-					return match
+					result = append(result, match)
 				}
-			} else {
-				logger.Printf(logger.INFO, "%s.%s: match [.]\n", f.stream.name, f.name)
+			}
+			if f.pattern == nil {
 				// No pattern, so this match will never actually be used
-				return "."
+				return []string{"."}
 			}
 		}
 	}
-	return ""
+	return result
 }
 
-func (f *Filter) sendActions(match string, at time.Time) {
+func (f *Filter) sendActions(match []string, at time.Time) {
 	for _, a := range f.Actions {
 		actionsC <- PAT{match, a, at.Add(a.afterDuration)}
 	}
 }
 
-func (a *Action) exec(match string) {
+func (a *Action) exec(match []string) {
 	defer wgActions.Done()
 
 	var computedCommand []string
+	var cmdItem string
 
 	if a.filter.pattern != nil {
 		computedCommand = make([]string, 0, len(a.Cmd))
 
 		for _, item := range a.Cmd {
-			computedCommand = append(computedCommand, strings.ReplaceAll(item, a.filter.pattern.nameWithBraces, match))
+			cmdItem = strings.Clone(item)
+			for i, p := range a.filter.pattern {
+				cmdItem = strings.ReplaceAll(cmdItem, p.nameWithBraces, match[i])
+			}
+			computedCommand = append(computedCommand, cmdItem)
 		}
 	} else {
 		computedCommand = a.Cmd
@@ -153,7 +172,7 @@ func ActionsManager(concurrency int) {
 			}
 		}()
 	}
-	execAction := func(a *Action, p string) {
+	execAction := func(a *Action, p []string) {
 		wgActions.Add(1)
 		execActionsC <- PA{p, a}
 	}
@@ -171,10 +190,10 @@ func ActionsManager(concurrency int) {
 				execAction(action, pattern)
 			} else {
 				actionsLock.Lock()
-				if actions[pa] == nil {
-					actions[pa] = make(map[time.Time]struct{})
+				if actions[&pa] == nil {
+					actions[&pa] = make(map[time.Time]struct{})
 				}
-				actions[pa][then] = struct{}{}
+				actions[&pa][then] = struct{}{}
 				actionsLock.Unlock()
 				go func(insidePat PAT, insideNow time.Time) {
 					time.Sleep(insidePat.t.Sub(insideNow))
@@ -185,8 +204,8 @@ func ActionsManager(concurrency int) {
 			pa := PA{pat.p, pat.a}
 			pattern, action, then := pat.p, pat.a, pat.t
 			actionsLock.Lock()
-			if actions[pa] != nil {
-				delete(actions[pa], then)
+			if actions[&pa] != nil {
+				delete(actions[&pa], then)
 			}
 			actionsLock.Unlock()
 			execAction(action, pattern)
@@ -194,7 +213,7 @@ func ActionsManager(concurrency int) {
 			ret := make(ActionsMap)
 			actionsLock.Lock()
 			for pa := range actions {
-				if pa.p == fo.p {
+				if IsStringArrayEqual(pa.p, fo.p) {
 					for range actions[pa] {
 						execAction(pa.a, pa.p)
 					}
@@ -257,7 +276,7 @@ func matchesManagerHandleFlush(fo FlushMatchOrder) {
 	ret := make(MatchesMap)
 	matchesLock.Lock()
 	for pf := range matches {
-		if fo.p == pf.p {
+		if IsStringArrayEqual(fo.p, pf.p) {
 			if fo.ret != nil {
 				ret[pf] = matches[pf]
 			}
@@ -279,26 +298,26 @@ func matchesManagerHandleMatch(pft PFT) bool {
 
 	if filter.Retry > 1 {
 		// make sure map exists
-		if matches[pf] == nil {
-			matches[pf] = make(map[time.Time]struct{})
+		if matches[&pf] == nil {
+			matches[&pf] = make(map[time.Time]struct{})
 		}
 		// add new match
-		matches[pf][then] = struct{}{}
+		matches[&pf][then] = struct{}{}
 		// remove match when expired
 		go func(pf PF, then time.Time) {
 			time.Sleep(then.Sub(time.Now()) + filter.retryDuration)
 			matchesLock.Lock()
-			if matches[pf] != nil {
+			if matches[&pf] != nil {
 				// FIXME replace this and all similar occurences
 				// by clear() when switching to go 1.21
-				delete(matches[pf], then)
+				delete(matches[&pf], then)
 			}
 			matchesLock.Unlock()
 		}(pf, then)
 	}
 
-	if filter.Retry <= 1 || len(matches[pf]) >= filter.Retry {
-		delete(matches, pf)
+	if filter.Retry <= 1 || len(matches[&pf]) >= filter.Retry {
+		delete(matches, &pf)
 		filter.sendActions(pattern, then)
 		return true
 	}
@@ -318,7 +337,7 @@ func StreamManager(s *Stream, endedSignal chan *Stream) {
 				return
 			}
 			for _, filter := range s.Filters {
-				if match := filter.match(line); match != "" {
+				if match := filter.match(line); len(match) > 0 {
 					matchesC <- PFT{match, filter, time.Now()}
 				}
 			}

app/example.yml

@@ -1,11 +1,4 @@
 ---
-# This example configuration file is a good starting point, but you're
-# strongly encouraged to take a look at the full documentation: https://reaction.ppom.me
-#
-# This file is using the well-established YAML configuration language.
-# Note that the more powerful JSONnet configuration language is also supported
-# and that the documentation uses JSONnet
-
 # definitions are just a place to put chunks of conf you want to reuse in another place
 # using YAML anchors `&name` and pointers `*name`
 # definitions are not readed by reaction
@@ -38,12 +31,10 @@ patterns:
 start:
   - [ 'ip46tables', '-w', '-N', 'reaction' ]
   - [ 'ip46tables', '-w', '-I', 'INPUT', '-p', 'all', '-j', 'reaction' ]
-  - [ 'ip46tables', '-w', '-I', 'FORWARD', '-p', 'all', '-j', 'reaction' ]
 
 # Those commands will be executed in order at stop, after everything else
 stop:
   - [ 'ip46tables', '-w,', '-D', 'INPUT', '-p', 'all', '-j', 'reaction' ]
-  - [ 'ip46tables', '-w,', '-D', 'FORWARD', '-p', 'all', '-j', 'reaction' ]
   - [ 'ip46tables', '-w', '-F', 'reaction' ]
   - [ 'ip46tables', '-w', '-X', 'reaction' ]
 

app/main.go

@@ -103,6 +103,8 @@ func basicUsage() {
   # remove currently active matches and run currently pending actions for the specified TARGET
   # (then show flushed matches and actions)
   # e.g. reaction flush 192.168.1.1
+  # Concatenate patterns with " / " if several patterns in TARGET
+  # e.g. reaction flush "192.168.1.1 / root"
 
   # options:
     -s/--socket SOCKET               # path to the client-daemon communication socket
@@ -209,7 +211,7 @@ func Main(version, commit string) {
 			logger.Fatalln("for now, -l/--limit is not supported")
 			os.Exit(1)
 		}
-		ClientFlush(f.Arg(0), *limit, *queryFormat)
+		ClientFlush(strings.Split(f.Arg(0), " / "), *limit, *queryFormat)
 
 	case "test-regex":
 		// socket not needed, no interaction with the daemon

app/persist.go

@@ -134,7 +134,7 @@ func rotateDB(c *Conf, logDec *gob.Decoder, flushDec *gob.Decoder, logEnc *gob.E
 	}()
 
 	// pattern, stream, fitler → last flush
-	flushes := make(map[PSF]time.Time)
+	flushes := make(map[*PSF]time.Time)
 	for {
 		var entry LogEntry
 		var filter *Filter
@@ -160,7 +160,7 @@ func rotateDB(c *Conf, logDec *gob.Decoder, flushDec *gob.Decoder, logEnc *gob.E
 		}
 
 		// store
-		flushes[PSF{entry.Pattern, entry.Stream, entry.Filter}] = entry.T
+		flushes[&PSF{entry.Pattern, entry.Stream, entry.Filter}] = entry.T
 	}
 
 	lastTimeCpt := int64(0)
@@ -201,8 +201,8 @@ func rotateDB(c *Conf, logDec *gob.Decoder, flushDec *gob.Decoder, logEnc *gob.E
 		}
 
 		// check if it hasn't been flushed
-		lastGlobalFlush := flushes[PSF{entry.Pattern, "", ""}].Unix()
-		lastLocalFlush := flushes[PSF{entry.Pattern, entry.Stream, entry.Filter}].Unix()
+		lastGlobalFlush := flushes[&PSF{entry.Pattern, "", ""}].Unix()
+		lastLocalFlush := flushes[&PSF{entry.Pattern, entry.Stream, entry.Filter}].Unix()
 		entryTime := entry.T.Unix()
 		if lastLocalFlush > entryTime || lastGlobalFlush > entryTime {
 			continue

app/pipe.go

@@ -7,6 +7,7 @@ import (
 	"path"
 	"sync"
 	"time"
+	"strings"
 
 	"framagit.org/ppom/reaction/logger"
 )
@@ -24,7 +25,7 @@ func genClientStatus(local_actions ActionsMap, local_matches MatchesMap, local_a
 		if cs[filter.stream.name][filter.name] == nil {
 			cs[filter.stream.name][filter.name] = make(MapPatternStatus)
 		}
-		cs[filter.stream.name][filter.name][pattern] = &PatternStatus{len(times), nil}
+		cs[filter.stream.name][filter.name][strings.Join(pattern, " / ")] = &PatternStatus{len(times), nil}
 	}
 
 	local_matchesLock.Unlock()
@@ -39,10 +40,10 @@ func genClientStatus(local_actions ActionsMap, local_matches MatchesMap, local_a
 		if cs[action.filter.stream.name][action.filter.name] == nil {
 			cs[action.filter.stream.name][action.filter.name] = make(MapPatternStatus)
 		}
-		if cs[action.filter.stream.name][action.filter.name][pattern] == nil {
-			cs[action.filter.stream.name][action.filter.name][pattern] = new(PatternStatus)
+		if cs[action.filter.stream.name][action.filter.name][strings.Join(pattern, " / ")] == nil {
+			cs[action.filter.stream.name][action.filter.name][strings.Join(pattern, " / ")] = new(PatternStatus)
 		}
-		ps := cs[action.filter.stream.name][action.filter.name][pattern]
+		ps := cs[action.filter.stream.name][action.filter.name][strings.Join(pattern, " / ")]
 		if ps.Actions == nil {
 			ps.Actions = make(map[string][]string)
 		}

app/startup.go

@@ -13,6 +13,7 @@ import (
 	"framagit.org/ppom/reaction/logger"
 
 	"github.com/google/go-jsonnet"
+	"golang.org/x/exp/slices"
 )
 
 func (c *Conf) setup() {
@@ -74,17 +75,17 @@ func (c *Conf) setup() {
 			filter.name = filterName
 
 			if strings.Contains(filter.name, ".") {
-				logger.Fatalf("Bad configuration: character '.' is not allowed in filter names: '%v'", filter.name)
+				logger.Fatalf(fmt.Sprintf("Bad configuration: character '.' is not allowed in filter names: '%v'", filter.name))
 			}
 			// Parse Duration
 			if filter.RetryPeriod == "" {
 				if filter.Retry > 1 {
-					logger.Fatalf("Bad configuration: retry but no retryperiod in %v.%v", stream.name, filter.name)
+					logger.Fatalf(fmt.Sprintf("Bad configuration: retry but no retryperiod in %v.%v", stream.name, filter.name))
 				}
 			} else {
 				retryDuration, err := time.ParseDuration(filter.RetryPeriod)
 				if err != nil {
-					logger.Fatalf("Bad configuration: Failed to parse retry time in %v.%v: %v", stream.name, filter.name, err)
+					logger.Fatalf(fmt.Sprintf("Bad configuration: Failed to parse retry time in %v.%v: %v", stream.name, filter.name, err))
 				}
 				filter.retryDuration = retryDuration
 			}
@@ -95,27 +96,17 @@ func (c *Conf) setup() {
 			// Compute Regexes
 			// Look for Patterns inside Regexes
 			for _, regex := range filter.Regex {
-				for patternName, pattern := range c.Patterns {
+				for _, pattern := range c.Patterns {
 					if strings.Contains(regex, pattern.nameWithBraces) {
-
-						if filter.pattern == nil {
-							filter.pattern = pattern
-						} else if filter.pattern == pattern {
-							// no op
-						} else {
-							logger.Fatalf(
-								"Bad configuration: Can't mix different patterns (%s, %s) in same filter (%s.%s)\n",
-								filter.pattern.name, patternName, streamName, filterName,
-							)
+						if !slices.Contains(filter.pattern, pattern) {
+							filter.pattern = append(filter.pattern, pattern)
 						}
-
-						// FIXME should go in the `if filter.pattern == nil`?
 						regex = strings.Replace(regex, pattern.nameWithBraces, pattern.Regex, 1)
 					}
 				}
 				compiledRegex, err := regexp.Compile(regex)
 				if err != nil {
-					log.Fatalf("%vBad configuration: regex of filter %s.%s: %v", logger.FATAL, stream.name, filter.name, err)
+					log.Fatal(fmt.Sprintf("Bad configuration: regex of filter %s.%s: %v", stream.name, filter.name, err))
 				}
 				filter.compiledRegex = append(filter.compiledRegex, *compiledRegex)
 			}

app/types.go

@@ -42,7 +42,7 @@ type Filter struct {
 
 	Regex         []string        `json:"regex"`
 	compiledRegex []regexp.Regexp `json:"-"`
-	pattern       *Pattern        `json:"-"`
+	pattern       []*Pattern        `json:"-"`
 
 	Retry         int           `json:"retry"`
 	RetryPeriod   string        `json:"retryperiod"`
@@ -67,7 +67,7 @@ type Action struct {
 type LogEntry struct {
 	T              time.Time
 	S              int64
-	Pattern        string
+	Pattern        []string
 	Stream, Filter string
 	SF             int
 	Exec           bool
@@ -82,37 +82,43 @@ type WriteDB struct {
 	file *os.File
 	enc  *gob.Encoder
 }
-
-type MatchesMap map[PF]map[time.Time]struct{}
-type ActionsMap map[PA]map[time.Time]struct{}
+// https://stackoverflow.com/a/69691894
+type MatchesMap map[*PF]map[time.Time]struct{}
+type ActionsMap map[*PA]map[time.Time]struct{}
 
 // Helper structs made to carry information
+// Stream, Filter
 type SF struct{ s, f string }
-type PSF struct{ p, s, f string }
+// Pattern, Stream, Filter
+type PSF struct{
+	p []string
+	s string
+	f string
+}
 type PF struct {
-	p string
+	p []string
 	f *Filter
 }
 type PFT struct {
-	p string
+	p []string
 	f *Filter
 	t time.Time
 }
 type PA struct {
-	p string
+	p []string
 	a *Action
 }
 type PAT struct {
-	p string
+	p []string
 	a *Action
 	t time.Time
 }
 
 type FlushMatchOrder struct {
-	p   string
+	p   []string
 	ret chan MatchesMap
 }
 type FlushActionOrder struct {
-	p   string
+	p   []string
 	ret chan ActionsMap
 }

config/example.jsonnet

@@ -1,15 +1,11 @@
-// This file is using JSONnet, a complete configuration language based on JSON
+// This file is using JSONNET, a complete configuration language based on JSON
 // See https://jsonnet.org
-// JSONnet is a superset of JSON, so one can write plain JSON files if wanted.
+// JSONNET is a superset of JSON, so one can write plain JSON files if wanted.
 // Note that YAML is also supported, see ./example.yml
 
-// This example configuration file is a good starting point, but you're
-// strongly encouraged to take a look at the full documentation: https://reaction.ppom.me
-
-// JSONnet functions
+// JSONNET functions
 local iptables(args) = ['ip46tables', '-w'] + args;
-// ip46tables is a minimal C program (only POSIX dependencies) present in a
-// subdirectory of this repo.
+// ip46tables is a minimal C program (only POSIX dependencies) present in a subdirectory of this repo.
 // it permits to handle both ipv4/iptables and ipv6/ip6tables commands
 
 // See meaning and usage of this function around L106
@@ -47,16 +43,14 @@ local banFor(time) = {
   start: [
     // Create an iptables chain for reaction
     iptables(['-N', 'reaction']),
-    // Insert this chain as the first item of the INPUT & FORWARD chains (for incoming connections)
+    // Insert this chain as the first item of the INPUT chain (for incoming connections)
     iptables(['-I', 'INPUT', '-p', 'all', '-j', 'reaction']),
-    iptables(['-I', 'FORWARD', '-p', 'all', '-j', 'reaction']),
   ],
 
   // Those commands will be executed in order at stop, after everything else
   stop: [
-    // Remove the chain from the INPUT & FORWARD chains
+    // Remove the chain from the INPUT chain
     iptables(['-D', 'INPUT', '-p', 'all', '-j', 'reaction']),
-    iptables(['-D', 'FORWARD', '-p', 'all', '-j', 'reaction']),
     // Empty the chain
     iptables(['-F', 'reaction']),
     // Delete the chain

config/reaction.debian.service

@@ -1,8 +1,6 @@
 [Unit]
 Description=A daemon that scans program outputs for repeated patterns, and takes action.
 Documentation=https://framagit.org/ppom/reaction-wiki
-# Ensure reaction will insert its chain after docker has inserted theirs. Only useful when iptables & docker are used
-# After=docker.service
 
 [Service]
 ExecStart=/usr/bin/reaction start -c /etc/reaction.jsonnet

config/reaction.example.service

@@ -1,8 +1,6 @@
 # vim: ft=systemd
 [Install]
 WantedBy=multi-user.target
-# Ensure reaction will insert its chain after docker has inserted theirs. Only useful when iptables & docker are used
-# After=docker.service
 
 # See `man systemd.exec` and `man systemd.service` for most options below
 [Service]

go.mod

@@ -4,6 +4,7 @@ go 1.20
 
 require (
 	github.com/google/go-jsonnet v0.20.0
+	golang.org/x/exp v0.0.0-20240213143201-ec583247a57a
 	sigs.k8s.io/yaml v1.1.0
 )
 

go.sum

@@ -1,6 +1,8 @@
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/go-jsonnet v0.20.0 h1:WG4TTSARuV7bSm4PMB4ohjxe33IHT5WVTrJSU33uT4g=
 github.com/google/go-jsonnet v0.20.0/go.mod h1:VbgWF9JX7ztlv770x/TolZNGGFfiHEVx9G6ca2eUmeA=
+golang.org/x/exp v0.0.0-20240213143201-ec583247a57a h1:HinSgX1tJRX3KsL//Gxynpw5CTOAIPhgL4W8PNiIpVE=
+golang.org/x/exp v0.0.0-20240213143201-ec583247a57a/go.mod h1:CxmFvTBINI24O/j8iY7H1xHzx2i4OsyguNBmN/uPtqc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
 gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

helpers_c/nft46.c

@@ -38,7 +38,7 @@ int isIPv6(char *tab, int len) {
 	}
 	// Each char must be a digit, :, a-f, or A-F
 	for (i=0; i<len; i++) {
-		if (!isdigit(tab[i]) && tab[i] != ':' && tab[i] != '.' && !(tab[i] >= 'a' && tab[i] <= 'f') && !(tab[i] >= 'A' && tab[i] <= 'F')) {
+		if (!isdigit(tab[i]) && tab[i] != ':' && !(tab[i] >= 'a' && tab[i] <= 'f') && !(tab[i] >= 'A' && tab[i] <= 'F')) {
 			return 0;
 		}
 	}