simonmittag/jabba

package j8a

import "regexp"

//TODO: rather not use multiple regexes in a chain and replace this with a tested thirdparty framework.
type iprex struct {
    //v6 hex with embedded v4 dec address
    ipv64e *regexp.Regexp

    //v6 simple
    ipv6s *regexp.Regexp

    //v6 extended
    ipv6 *regexp.Regexp

    //v4 addresses
    ipv4 *regexp.Regexp
}

func (ipr *iprex) extractAddr(msg string) string {
    addr := "not found"
    if ipr.ipv6s == nil {
        r2, _ := regexp.Compile("([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}")
        ipr.ipv6s = r2
    }
    if ipr.ipv6 == nil {
        r1, _ := regexp.Compile("(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))")
        ipr.ipv6 = r1
    }
    if ipr.ipv64e == nil {
        r, _ := regexp.Compile("(:{0,2})([0-9a-fA-F]{1,4}:){1,6}(:{0,1})((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])")
        ipr.ipv64e = r
    }
    if ipr.ipv4 == nil {
        r, _ := regexp.Compile("((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])")
        ipr.ipv4 = r
    }
    match := ipr.ipv64e.FindStringSubmatch(msg)
    if len(match) > 0 {
        addr = match[0]
    } else {
        match2 := ipr.ipv6s.FindStringSubmatch(msg)
        if len(match2) > 0 {
            addr = match2[0]
        } else {
            match3 := ipr.ipv6.FindStringSubmatch(msg)
            if len(match3) > 0 {
                addr = match3[0]
            } else {
                match4 := ipr.ipv4.FindStringSubmatch(msg)
                if len(match4) > 0 {
                    addr = match4[0]
                }
            }
        }
    }
    return addr
}