1 files changed, 606 insertions, 0 deletions
diff --git a/vendor/gopkg.in/mcuadros/go-syslog.v2/internal/syslogparser/rfc5424/rfc5424.go b/vendor/gopkg.in/mcuadros/go-syslog.v2/internal/syslogparser/rfc5424/rfc5424.go
new file mode 100644
index 000000000..bea8e5879
--- /dev/null
+++ b/vendor/gopkg.in/mcuadros/go-syslog.v2/internal/syslogparser/rfc5424/rfc5424.go
@@ -0,0 +1,606 @@
+// Note to self : never try to code while looking after your kids
+// The result might look like this : https://pbs.twimg.com/media/BXqSuYXIEAAscVA.png
+
+package rfc5424
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+	"time"
+
+	"gopkg.in/mcuadros/go-syslog.v2/internal/syslogparser"
+)
+
+const (
+	NILVALUE = '-'
+)
+
+var (
+	ErrYearInvalid       = &syslogparser.ParserError{"Invalid year in timestamp"}
+	ErrMonthInvalid      = &syslogparser.ParserError{"Invalid month in timestamp"}
+	ErrDayInvalid        = &syslogparser.ParserError{"Invalid day in timestamp"}
+	ErrHourInvalid       = &syslogparser.ParserError{"Invalid hour in timestamp"}
+	ErrMinuteInvalid     = &syslogparser.ParserError{"Invalid minute in timestamp"}
+	ErrSecondInvalid     = &syslogparser.ParserError{"Invalid second in timestamp"}
+	ErrSecFracInvalid    = &syslogparser.ParserError{"Invalid fraction of second in timestamp"}
+	ErrTimeZoneInvalid   = &syslogparser.ParserError{"Invalid time zone in timestamp"}
+	ErrInvalidTimeFormat = &syslogparser.ParserError{"Invalid time format"}
+	ErrInvalidAppName    = &syslogparser.ParserError{"Invalid app name"}
+	ErrInvalidProcId     = &syslogparser.ParserError{"Invalid proc ID"}
+	ErrInvalidMsgId      = &syslogparser.ParserError{"Invalid msg ID"}
+	ErrNoStructuredData  = &syslogparser.ParserError{"No structured data"}
+)
+
+type Parser struct {
+	buff           []byte
+	cursor         int
+	l              int
+	header         header
+	structuredData string
+	message        string
+}
+
+type header struct {
+	priority  syslogparser.Priority
+	version   int
+	timestamp time.Time
+	hostname  string
+	appName   string
+	procId    string
+	msgId     string
+}
+
+type partialTime struct {
+	hour    int
+	minute  int
+	seconds int
+	secFrac float64
+}
+
+type fullTime struct {
+	pt  partialTime
+	loc *time.Location
+}
+
+type fullDate struct {
+	year  int
+	month int
+	day   int
+}
+
+func NewParser(buff []byte) *Parser {
+	return &Parser{
+		buff:   buff,
+		cursor: 0,
+		l:      len(buff),
+	}
+}
+
+func (p *Parser) Location(location *time.Location) {
+	// Ignore as RFC5424 syslog always has a timezone
+}
+
+func (p *Parser) Parse() error {
+	hdr, err := p.parseHeader()
+	if err != nil {
+		return err
+	}
+
+	p.header = hdr
+
+	sd, err := p.parseStructuredData()
+	if err != nil {
+		return err
+	}
+
+	p.structuredData = sd
+	p.cursor++
+
+	if p.cursor < p.l {
+		p.message = string(p.buff[p.cursor:])
+	}
+
+	return nil
+}
+
+func (p *Parser) Dump() syslogparser.LogParts {
+	return syslogparser.LogParts{
+		"priority":        p.header.priority.P,
+		"facility":        p.header.priority.F.Value,
+		"severity":        p.header.priority.S.Value,
+		"version":         p.header.version,
+		"timestamp":       p.header.timestamp,
+		"hostname":        p.header.hostname,
+		"app_name":        p.header.appName,
+		"proc_id":         p.header.procId,
+		"msg_id":          p.header.msgId,
+		"structured_data": p.structuredData,
+		"message":         p.message,
+	}
+}
+
+// HEADER = PRI VERSION SP TIMESTAMP SP HOSTNAME SP APP-NAME SP PROCID SP MSGID
+func (p *Parser) parseHeader() (header, error) {
+	hdr := header{}
+
+	pri, err := p.parsePriority()
+	if err != nil {
+		return hdr, err
+	}
+
+	hdr.priority = pri
+
+	ver, err := p.parseVersion()
+	if err != nil {
+		return hdr, err
+	}
+	hdr.version = ver
+	p.cursor++
+
+	ts, err := p.parseTimestamp()
+	if err != nil {
+		return hdr, err
+	}
+
+	hdr.timestamp = ts
+	p.cursor++
+
+	host, err := p.parseHostname()
+	if err != nil {
+		return hdr, err
+	}
+
+	hdr.hostname = host
+	p.cursor++
+
+	appName, err := p.parseAppName()
+	if err != nil {
+		return hdr, err
+	}
+
+	hdr.appName = appName
+	p.cursor++
+
+	procId, err := p.parseProcId()
+	if err != nil {
+		return hdr, nil
+	}
+
+	hdr.procId = procId
+	p.cursor++
+
+	msgId, err := p.parseMsgId()
+	if err != nil {
+		return hdr, nil
+	}
+
+	hdr.msgId = msgId
+	p.cursor++
+
+	return hdr, nil
+}
+
+func (p *Parser) parsePriority() (syslogparser.Priority, error) {
+	return syslogparser.ParsePriority(p.buff, &p.cursor, p.l)
+}
+
+func (p *Parser) parseVersion() (int, error) {
+	return syslogparser.ParseVersion(p.buff, &p.cursor, p.l)
+}
+
+// https://tools.ietf.org/html/rfc5424#section-6.2.3
+func (p *Parser) parseTimestamp() (time.Time, error) {
+	var ts time.Time
+
+	if p.cursor >= p.l {
+		return ts, ErrInvalidTimeFormat
+	}
+
+	if p.buff[p.cursor] == NILVALUE {
+		p.cursor++
+		return ts, nil
+	}
+
+	fd, err := parseFullDate(p.buff, &p.cursor, p.l)
+	if err != nil {
+		return ts, err
+	}
+
+	if p.cursor >= p.l || p.buff[p.cursor] != 'T' {
+		return ts, ErrInvalidTimeFormat
+	}
+
+	p.cursor++
+
+	ft, err := parseFullTime(p.buff, &p.cursor, p.l)
+	if err != nil {
+		return ts, syslogparser.ErrTimestampUnknownFormat
+	}
+
+	nSec, err := toNSec(ft.pt.secFrac)
+	if err != nil {
+		return ts, err
+	}
+
+	ts = time.Date(
+		fd.year,
+		time.Month(fd.month),
+		fd.day,
+		ft.pt.hour,
+		ft.pt.minute,
+		ft.pt.seconds,
+		nSec,
+		ft.loc,
+	)
+
+	return ts, nil
+}
+
+// HOSTNAME = NILVALUE / 1*255PRINTUSASCII
+func (p *Parser) parseHostname() (string, error) {
+	return syslogparser.ParseHostname(p.buff, &p.cursor, p.l)
+}
+
+// APP-NAME = NILVALUE / 1*48PRINTUSASCII
+func (p *Parser) parseAppName() (string, error) {
+	return parseUpToLen(p.buff, &p.cursor, p.l, 48, ErrInvalidAppName)
+}
+
+// PROCID = NILVALUE / 1*128PRINTUSASCII
+func (p *Parser) parseProcId() (string, error) {
+	return parseUpToLen(p.buff, &p.cursor, p.l, 128, ErrInvalidProcId)
+}
+
+// MSGID = NILVALUE / 1*32PRINTUSASCII
+func (p *Parser) parseMsgId() (string, error) {
+	return parseUpToLen(p.buff, &p.cursor, p.l, 32, ErrInvalidMsgId)
+}
+
+func (p *Parser) parseStructuredData() (string, error) {
+	return parseStructuredData(p.buff, &p.cursor, p.l)
+}
+
+// ----------------------------------------------
+// https://tools.ietf.org/html/rfc5424#section-6
+// ----------------------------------------------
+
+// XXX : bind them to Parser ?
+
+// FULL-DATE : DATE-FULLYEAR "-" DATE-MONTH "-" DATE-MDAY
+func parseFullDate(buff []byte, cursor *int, l int) (fullDate, error) {
+	var fd fullDate
+
+	year, err := parseYear(buff, cursor, l)
+	if err != nil {
+		return fd, err
+	}
+
+	if *cursor >= l || buff[*cursor] != '-' {
+		return fd, syslogparser.ErrTimestampUnknownFormat
+	}
+
+	*cursor++
+
+	month, err := parseMonth(buff, cursor, l)
+	if err != nil {
+		return fd, err
+	}
+
+	if *cursor >= l || buff[*cursor] != '-' {
+		return fd, syslogparser.ErrTimestampUnknownFormat
+	}
+
+	*cursor++
+
+	day, err := parseDay(buff, cursor, l)
+	if err != nil {
+		return fd, err
+	}
+
+	fd = fullDate{
+		year:  year,
+		month: month,
+		day:   day,
+	}
+
+	return fd, nil
+}
+
+// DATE-FULLYEAR   = 4DIGIT
+func parseYear(buff []byte, cursor *int, l int) (int, error) {
+	yearLen := 4
+
+	if *cursor+yearLen > l {
+		return 0, syslogparser.ErrEOL
+	}
+
+	// XXX : we do not check for a valid year (ie. 1999, 2013 etc)
+	// XXX : we only checks the format is correct
+	sub := string(buff[*cursor : *cursor+yearLen])
+
+	*cursor += yearLen
+
+	year, err := strconv.Atoi(sub)
+	if err != nil {
+		return 0, ErrYearInvalid
+	}
+
+	return year, nil
+}
+
+// DATE-MONTH = 2DIGIT  ; 01-12
+func parseMonth(buff []byte, cursor *int, l int) (int, error) {
+	return syslogparser.Parse2Digits(buff, cursor, l, 1, 12, ErrMonthInvalid)
+}
+
+// DATE-MDAY = 2DIGIT  ; 01-28, 01-29, 01-30, 01-31 based on month/year
+func parseDay(buff []byte, cursor *int, l int) (int, error) {
+	// XXX : this is a relaxed constraint
+	// XXX : we do not check if valid regarding February or leap years
+	// XXX : we only checks that day is in range [01 -> 31]
+	// XXX : in other words this function will not rant if you provide Feb 31th
+	return syslogparser.Parse2Digits(buff, cursor, l, 1, 31, ErrDayInvalid)
+}
+
+// FULL-TIME = PARTIAL-TIME TIME-OFFSET
+func parseFullTime(buff []byte, cursor *int, l int) (fullTime, error) {
+	var loc = new(time.Location)
+	var ft fullTime
+
+	pt, err := parsePartialTime(buff, cursor, l)
+	if err != nil {
+		return ft, err
+	}
+
+	loc, err = parseTimeOffset(buff, cursor, l)
+	if err != nil {
+		return ft, err
+	}
+
+	ft = fullTime{
+		pt:  pt,
+		loc: loc,
+	}
+
+	return ft, nil
+}
+
+// PARTIAL-TIME = TIME-HOUR ":" TIME-MINUTE ":" TIME-SECOND[TIME-SECFRAC]
+func parsePartialTime(buff []byte, cursor *int, l int) (partialTime, error) {
+	var pt partialTime
+
+	hour, minute, err := getHourMinute(buff, cursor, l)
+	if err != nil {
+		return pt, err
+	}
+
+	if *cursor >= l || buff[*cursor] != ':' {
+		return pt, ErrInvalidTimeFormat
+	}
+
+	*cursor++
+
+	// ----
+
+	seconds, err := parseSecond(buff, cursor, l)
+	if err != nil {
+		return pt, err
+	}
+
+	pt = partialTime{
+		hour:    hour,
+		minute:  minute,
+		seconds: seconds,
+	}
+
+	// ----
+
+	if *cursor >= l || buff[*cursor] != '.' {
+		return pt, nil
+	}
+
+	*cursor++
+
+	secFrac, err := parseSecFrac(buff, cursor, l)
+	if err != nil {
+		return pt, nil
+	}
+	pt.secFrac = secFrac
+
+	return pt, nil
+}
+
+// TIME-HOUR = 2DIGIT  ; 00-23
+func parseHour(buff []byte, cursor *int, l int) (int, error) {
+	return syslogparser.Parse2Digits(buff, cursor, l, 0, 23, ErrHourInvalid)
+}
+
+// TIME-MINUTE = 2DIGIT  ; 00-59
+func parseMinute(buff []byte, cursor *int, l int) (int, error) {
+	return syslogparser.Parse2Digits(buff, cursor, l, 0, 59, ErrMinuteInvalid)
+}
+
+// TIME-SECOND = 2DIGIT  ; 00-59
+func parseSecond(buff []byte, cursor *int, l int) (int, error) {
+	return syslogparser.Parse2Digits(buff, cursor, l, 0, 59, ErrSecondInvalid)
+}
+
+// TIME-SECFRAC = "." 1*6DIGIT
+func parseSecFrac(buff []byte, cursor *int, l int) (float64, error) {
+	maxDigitLen := 6
+
+	max := *cursor + maxDigitLen
+	from := *cursor
+	to := from
+
+	for to = from; to < max; to++ {
+		if to >= l {
+			break
+		}
+
+		c := buff[to]
+		if !syslogparser.IsDigit(c) {
+			break
+		}
+	}
+
+	sub := string(buff[from:to])
+	if len(sub) == 0 {
+		return 0, ErrSecFracInvalid
+	}
+
+	secFrac, err := strconv.ParseFloat("0."+sub, 64)
+	*cursor = to
+	if err != nil {
+		return 0, ErrSecFracInvalid
+	}
+
+	return secFrac, nil
+}
+
+// TIME-OFFSET = "Z" / TIME-NUMOFFSET
+func parseTimeOffset(buff []byte, cursor *int, l int) (*time.Location, error) {
+
+	if *cursor >= l || buff[*cursor] == 'Z' {
+		*cursor++
+		return time.UTC, nil
+	}
+
+	return parseNumericalTimeOffset(buff, cursor, l)
+}
+
+// TIME-NUMOFFSET  = ("+" / "-") TIME-HOUR ":" TIME-MINUTE
+func parseNumericalTimeOffset(buff []byte, cursor *int, l int) (*time.Location, error) {
+	var loc = new(time.Location)
+
+	sign := buff[*cursor]
+
+	if (sign != '+') && (sign != '-') {
+		return loc, ErrTimeZoneInvalid
+	}
+
+	*cursor++
+
+	hour, minute, err := getHourMinute(buff, cursor, l)
+	if err != nil {
+		return loc, err
+	}
+
+	tzStr := fmt.Sprintf("%s%02d:%02d", string(sign), hour, minute)
+	tmpTs, err := time.Parse("-07:00", tzStr)
+	if err != nil {
+		return loc, err
+	}
+
+	return tmpTs.Location(), nil
+}
+
+func getHourMinute(buff []byte, cursor *int, l int) (int, int, error) {
+	hour, err := parseHour(buff, cursor, l)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	if *cursor >= l || buff[*cursor] != ':' {
+		return 0, 0, ErrInvalidTimeFormat
+	}
+
+	*cursor++
+
+	minute, err := parseMinute(buff, cursor, l)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	return hour, minute, nil
+}
+
+func toNSec(sec float64) (int, error) {
+	_, frac := math.Modf(sec)
+	fracStr := strconv.FormatFloat(frac, 'f', 9, 64)
+	fracInt, err := strconv.Atoi(fracStr[2:])
+	if err != nil {
+		return 0, err
+	}
+
+	return fracInt, nil
+}
+
+// ------------------------------------------------
+// https://tools.ietf.org/html/rfc5424#section-6.3
+// ------------------------------------------------
+
+func parseStructuredData(buff []byte, cursor *int, l int) (string, error) {
+	var sdData string
+	var found bool
+
+	if *cursor >= l {
+		return "-", nil
+	}
+
+	if buff[*cursor] == NILVALUE {
+		*cursor++
+		return "-", nil
+	}
+
+	if buff[*cursor] != '[' {
+		return sdData, ErrNoStructuredData
+	}
+
+	from := *cursor
+	to := from
+
+	for to = from; to < l; to++ {
+		if found {
+			break
+		}
+
+		b := buff[to]
+
+		if b == ']' {
+			switch t := to + 1; {
+			case t == l:
+				found = true
+			case t <= l && buff[t] == ' ':
+				found = true
+			}
+		}
+	}
+
+	if found {
+		*cursor = to
+		return string(buff[from:to]), nil
+	}
+
+	return sdData, ErrNoStructuredData
+}
+
+func parseUpToLen(buff []byte, cursor *int, l int, maxLen int, e error) (string, error) {
+	var to int
+	var found bool
+	var result string
+
+	max := *cursor + maxLen
+
+	for to = *cursor; (to <= max) && (to < l); to++ {
+		if buff[to] == ' ' {
+			found = true
+			break
+		}
+	}
+
+	if found {
+		result = string(buff[*cursor:to])
+	} else if to > max {
+		to = max // don't go past max
+	}
+
+	*cursor = to
+
+	if found {
+		return result, nil
+	}
+
+	return "", e
+}