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package main | |
import ( | |
"errors" | |
"fmt" | |
geoip2 "github.com/oschwald/geoip2-golang" | |
"log" | |
"net" | |
"os" | |
"regexp" | |
) | |
func usage() { | |
fmt.Fprintf(os.Stderr, "Usage: %s <mmdb-file> <start-ip> <end-ip>\n", os.Args[0]) | |
os.Exit(1) | |
} | |
func IP2Long(ip net.IP) (uint32, error) { | |
ip_byte := ip.To4() | |
if ip_byte == nil { | |
return 0, errors.New("Not an IPv4 address.") | |
} | |
return uint32(ip_byte[0])<<24 | uint32(ip_byte[1])<<16 | | |
uint32(ip_byte[2])<<8 | uint32(ip_byte[3]), | |
nil | |
} | |
func Long2IP(long uint32) net.IP { | |
return net.IPv4(byte(long>>24), byte(long>>16), byte(long>>8), byte(long)) | |
} | |
func main() { | |
if len(os.Args) != 4 { | |
usage() | |
} | |
mmdb, startIPStr, endIPStr := os.Args[1], os.Args[2], os.Args[3] | |
startIP, endIP := net.ParseIP(startIPStr), net.ParseIP(endIPStr) | |
if startIP == nil || endIP == nil { | |
fmt.Fprintf(os.Stderr, "IP address specification is incorrect.\n") | |
os.Exit(2) | |
} | |
startLong, err := IP2Long(startIP) | |
if err != nil { | |
log.Fatal(err) | |
os.Exit(2) | |
} | |
endLong, err := IP2Long(endIP) | |
if err != nil { | |
log.Fatal(err) | |
os.Exit(2) | |
} | |
if startLong > endLong { | |
fmt.Fprintf(os.Stderr, "End IP must be greater than start IP.\n") | |
os.Exit(2) | |
} | |
db, err := geoip2.Open(mmdb) | |
if err != nil { | |
log.Fatal(err) | |
} | |
rangeStart := startLong | |
record, err := db.City(Long2IP(rangeStart)) | |
lastIsoCode := "" | |
if err == nil { | |
lastIsoCode = record.Country.IsoCode | |
} | |
r, _ := regexp.Compile("(?i)Crimea|Sevastopol|Simferopol|Kerch|Evpatori|Yalta|Feodosi|Inkerman") | |
for i := startLong; i <= endLong; i++ { | |
ip := Long2IP(i) | |
record, err := db.City(ip) | |
code := "" | |
if err == nil { | |
code = record.Country.IsoCode | |
} | |
if code == "UA" && len(record.Subdivisions) > 0 && r.MatchString(record.Subdivisions[0].Names["en"]) { | |
code = "RU" | |
} | |
if code != lastIsoCode { | |
if lastIsoCode != "" { | |
fmt.Printf("%s-%s %s;\n", Long2IP(rangeStart).String(), Long2IP(i-1).String(), lastIsoCode) | |
} | |
lastIsoCode = code | |
rangeStart = i | |
} | |
} | |
if lastIsoCode != "" { | |
fmt.Printf("%s-%s %s;\n", Long2IP(rangeStart).String(), Long2IP(endLong).String(), lastIsoCode) | |
} | |
os.Exit(0) | |
} |
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