Parse an IP Address: Difference between revisions
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{{task}}The purpose of this task is to demonstrate parsing of text-format IP addresses, using IPv4 and IPv6. |
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Taking the following as inputs: |
Taking the following as inputs: |
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Revision as of 16:42, 11 May 2014
You are encouraged to solve this task according to the task description, using any language you may know.
The purpose of this task is to demonstrate parsing of text-format IP addresses, using IPv4 and IPv6.
Taking the following as inputs:
| 127.0.0.1 | The "localhost" IPv4 address |
| 127.0.0.1:80 | The "localhost" IPv4 address, with a specified port (80) |
| ::1 | The "localhost" IPv6 address |
| [::1]:80 | The "localhost" IPv6 address, with a specified port (80) |
| 2605:2700:0:3::4713:93e3 | Rosetta Code's primary server's public IPv6 address |
| [2605:2700:0:3::4713:93e3]:80 | Rosetta Code's primary server's public IPv6 address, with a specified port (80) |
Emit each described IP address as a hexadecimal integer representing the address, the address space, and the port number specified, if any. In languages where variant result types are clumsy, the result should be ipv4 or ipv6 address number, something which says which address space was represented, port number and something that says if the port was specified.
For example 127.0.0.1 has the address number 7F000001 (2130706433 decimal) in the ipv4 address space. ::ffff:127.0.0.1 represents the same address in the ipv6 address space where it has the address number FFFF7F000001 (281472812449793 decimal). Meanwhile ::1 has address number 1 and serves the same purpose in the ipv6 address space that 127.0.0.1 serves in the ipv4 address space.
Go
<lang go>package main
import (
"fmt" "net" "strconv"
)
var testCases = []string{
"127.0.0.1", "127.0.0.1:80", "::1", "[::1]:80", "2605:2700:0:3::4713:93e3", "[2605:2700:0:3::4713:93e3]:80",
}
func main() {
var max int
for _, addr := range testCases {
if len(addr) > max {
max = len(addr)
}
}
fmt.Printf("%-*s ", max, "Input")
fmt.Println(" Address Space Port")
for _, addr := range testCases {
fmt.Printf("%-*s ", max, addr)
ip := net.ParseIP(addr)
var host, port string
var err error
if ip == nil {
host, port, err = net.SplitHostPort(addr)
if err != nil {
fmt.Println(err)
continue
}
ip = net.ParseIP(host)
}
if ip == nil {
fmt.Println("Invalid address format")
continue
}
if port > "" {
pn, err := strconv.Atoi(port)
if err != nil {
fmt.Println("Invalid port: ", err)
continue
}
if pn < 0 || pn > 65535 {
fmt.Println("Invalid port number")
continue
}
}
space := "ipv6"
if ip4 := ip.To4(); ip4 != nil {
space = "ipv4"
fmt.Print(" ")
ip = ip4
}
for _, b := range ip {
fmt.Printf("%02x", b)
}
fmt.Printf(" %s %s\n", space, port)
}
}</lang> Output:
Input Address Space Port 127.0.0.1 7f000001 ipv4 127.0.0.1:80 7f000001 ipv4 80 ::1 00000000000000000000000000000001 ipv6 [::1]:80 00000000000000000000000000000001 ipv6 80 2605:2700:0:3::4713:93e3 260527000000000300000000471393e3 ipv6 [2605:2700:0:3::4713:93e3]:80 260527000000000300000000471393e3 ipv6 80
Icon and Unicon
<lang Icon>link printf, hexcvt
procedure main()
L := ["192.168.0.1", # private
"127.0.0.1", # loop back
"127.0.0.1:80", # loop back +port
"2001:db8:85a3:0:0:8a2e:370:7334", # doc, IPv6 for 555-1234
"2001:db8:85a3::8a2e:370:7334", # doc
"::1", # loop back
"[::1]:80", # loop back +port
"::", # unspecified
"::ffff:192.168.0.1", # transition
"2605:2700:0:3::4713:93e3", # RC
"[2605:2700:0:3::4713:93e3]:80", # RC
"::ffff:71.19.147.227", # RC transition
"[::ffff:71.19.147.227]:80", # RC transition +port
"[2001:db8:85a3:8d3:1319:8a2e:370:7348]:443", # doc +port
"256.0.0.0", # invalid
"g::1"] # invalid
every x := !L do {
if x ? (ip := ipmatch(), port := portmatch(), pos(0)) then {
if i := IPv4decode(ip) then
printf("%s is the IPv4 address = x'%s'",x,i)
else if i := IPv6decode(ip) then
printf("%s is the IPv6 address = x'%s'",x,i)
else {
printf("%s is not a valid IP address\n",x)
next
}
if \port then printf(" port=%s\n",port) else printf("\n")
}
else printf("%s is not an IP address\n",x)
}
end
procedure ipmatch() #: match an ip v4/v6 address
static c4,c6
initial {
c4 := &digits ++ '.'
c6 := &digits ++ 'abcdef:'
}
suspend (="[" || ( (="::ffff:" || tab(many(c4))) | tab(many(c6)) ) || ="]") |
( ="::ffff:" || tab(many(c4))) | tab(many(c6|c4))
end
procedure portmatch() #: match a port number
return (=":",0 < (65536 > tab(many(&digits)))) | &null
end
procedure IPv4decode(s) #: match IPv4 to hex string
s ? ( ip := (0 <= (256 > tab(many(&digits)))), ip *:= 256, =".",
ip +:= (0 <= (256 > tab(many(&digits)))), ip *:= 256, =".",
ip +:= (0 <= (256 > tab(many(&digits)))), ip *:= 256, =".",
ip +:= (0 <= (256 > tab(many(&digits)))),
return right(hexstring(ip,,&lcase),8) )
end
procedure IPv6decode(s) #: IPv6 to hex string
s ?:= 2(="[", tab(-1), ="]") # remove any []
if find(".",s) then # transitional
s ? ( tab(many(':0')), ="ffff:",
return right("ffff" || IPv4decode(tab(0)),32,"0") )
else {
h := t := ""
s ? {
while x := tab(find(":")) do { # head
if *x <= 4 then h ||:= right(x,4,"0")
if ="::" then break
else move(1)
}
while x := tab(find(":")|0) do { # tail
if *x <= 4 then t ||:= right(x,4,"0")
move(1) | break
}
if x := h || repl("0",32-(*h+*t)) || t then # and insides
return x
}
}
end</lang>
printf.icn provides the printf family hexcvt.icn provides hex and hexstring
Output:
192.168.0.1 is the IPv4 address = x'c0a80001' 127.0.0.1 is the IPv4 address = x'7f000001' 127.0.0.1:80 is the IPv4 address = x'7f000001' port=80 2001:db8:85a3:0:0:8a2e:370:7334 is the IPv6 address = x'20010db885a3000000008a2e03707334' 2001:db8:85a3::8a2e:370:7334 is the IPv6 address = x'20010db885a3000000008a2e03707334' ::1 is the IPv6 address = x'00000000000000000000000000000001' [::1]:80 is the IPv6 address = x'00000000000000000000000000000001' port=80 :: is the IPv6 address = x'00000000000000000000000000000000' ::ffff:192.168.0.1 is the IPv6 address = x'00000000000000000000ffffc0a80001' 2605:2700:0:3::4713:93e3 is the IPv6 address = x'260527000000000300000000471393e3' [2605:2700:0:3::4713:93e3]:80 is the IPv6 address = x'260527000000000300000000471393e3' port=80 ::ffff:71.19.147.227 is the IPv6 address = x'00000000000000000000ffff471393e3' [::ffff:71.19.147.227]:80 is the IPv6 address = x'00000000000000000000ffff471393e3' port=80 [2001:db8:85a3:8d3:1319:8a2e:370:7348]:443 is the IPv6 address = x'20010db885a308d313198a2e03707348' port=443 256.0.0.0 is not a valid IP address g::1 is not an IP address
J
Implementation:
<lang J>parseaddr=:3 :0
if. '.' e. y do.
if. +./'::' E. y do.
parsehybrid y
else.
parseipv4 y
end.
else.
parseipv6 y
end.
)
parseipv4=:3 :0
'addr port'=. 2{.<;._2 y,'::'
4,((4#256)#._&".;._1'.',addr),_".port
)
parseipv6=:3 :0
'addr port'=. 2{.<;._2 (y-.'['),']]'
split=. I. '::' E. addr
a1=. 8{. dfh;._2 (split {. addr),8#':'
a2=._8{. dfh;._1 (8#':'),split }. addr
6,(65536x#.a1+a2),_".port-.':'
)
parsehybrid=:3 :0
'kludge port'=. 2{.<;._2 (tolower y-.'['),']]'
addr=. _1 {:: <;._2 kludge,':'
assert. (kludge-:'::ffff:',addr) +. kludge-: '::',addr
6,(16bffff00000000+1{parseipv4 addr),_".port-.':'
)
fmt=:3 :0
port=.
((#y){.'v';'addr';'port')=. y
'ipv',(":v),' ',(hfd addr),(#port)#' ',":port
)</lang>
Task examples:
<lang J> fmt parseaddr '127.0.0.1' ipv4 7f000001
fmt parseaddr '127.0.0.1:80'
ipv4 7f000001 80
fmt parseaddr '::1'
ipv6 1
fmt parseaddr '[::1]:80'
ipv6 1 80
fmt parseaddr '2605:2700:0:3::4713:93e3'
ipv6 260527000000000300000000471393e3
fmt parseaddr '[2605:2700:0:3::4713:93e3]:80'
ipv6 260527000000000300000000471393e3 80</lang>
Perl
<lang perl>sub parse_v4 { my ($ip, $port) = @_; my @quad = split(/\./, $ip);
return unless @quad == 4; for (@quad) { return if ($_ > 255) }
if (!length $port) { $port = -1 } elsif ($port =~ /^(\d+)$/) { $port = $1 } else { return }
my $h = join => map(sprintf("%02x", $_), @quad); return $h, $port }
sub parse_v6 { my $ip = shift; my $omits;
return unless $ip =~ /^[\da-f:.]+$/i; # invalid char
$ip =~ s/^:/0:/; $omits = 1 if $ip =~ s/::/:z:/g; return if $ip =~ /z.*z/; # multiple omits illegal
my $v4 = ; my $len = 8;
if ($ip =~ s/:((?:\d+\.){3}\d+)$//) { # hybrid 4/6 ip ($v4) = parse_v4($1) or return; $len -= 2;
} # what's left should be v6 only return unless $ip =~ /^[:a-fz\d]+$/i;
my @h = split(/:/, $ip); return if @h + $omits > $len; # too many segments
@h = map( $_ eq 'z' ? (0) x ($len - @h + 1) : ($_), @h); return join( => map(sprintf("%04x", hex($_)), @h)).$v4; }
sub parse_ip { my $str = shift; $str =~ s/^\s*//; $str =~ s/\s*$//;
if ($str =~ s/^((?:\d+\.)+\d+)(?::(\d+))?$//) { return 'v4', parse_v4($1, $2); }
my ($ip, $port); if ($str =~ /^\[(.*?)\]:(\d+)$/) { $port = $2; $ip = parse_v6($1); } else { $port = -1; $ip = parse_v6($str); }
return unless $ip; return 'v6', $ip, $port; }
for (qw/127.0.0.1 127.0.0.1:80 ::1 [::1]:80 2605:2700:0:3::4713:93e3 [2605:2700:0:3::4713:93e3]:80 ::ffff:192.168.0.1 [::ffff:192.168.0.1]:22 ::ffff:127.0.0.0.1 a::b::1/) { print "$_\n\t"; my ($ver, $ip, $port) = parse_ip($_) or print "parse error\n" and next;
print "$ver $ip\tport $port\n\n"; }</lang>output<lang>127.0.0.1
v4 7f000001 port -1
127.0.0.1:80
v4 7f000001 port 80
- 1
v6 00000000000000000000000000000001 port -1
[::1]:80
v6 00000000000000000000000000000001 port 80
2605:2700:0:3::4713:93e3
v6 260527000000000300000000471393e3 port -1
[2605:2700:0:3::4713:93e3]:80
v6 260527000000000300000000471393e3 port 80
- ffff:192.168.0.1
v6 00000000000000000000ffffc0a80001 port -1
[::ffff:192.168.0.1]:22
v6 00000000000000000000ffffc0a80001 port 22
- ffff:127.0.0.0.1
parse error
a::b::1
parse error</lang>
Perl 6
<lang perl6>grammar IP_Addr {
token TOP { ^ [ <IPv4> | <IPv6> ] $ }
token IPv4 {
[ <d8> +% '.' ] <?{ $<d8> == 4 }> <port>?
{ @*by8 = @$<d8> }
}
token IPv6 {
| <ipv6>
| '[' <ipv6> ']' <port>
}
token ipv6 {
| <h16> +% ':' <?{ $<h16> == 8 }>
{ @*by16 = @$<h16> }
| [ (<h16>) +% ':']? '::' (<h16>) +% ':' <?{ @$0 + @$1 <= 8 }>
{ @*by16 = @$0, '0' xx 8 - (@$0 + @$1), @$1 }
| '::ffff:' <IPv4>
{ @*by16 = '0' xx 5, 'ffff', by8to16 @*by8 }
}
token d8 { (\d+) <?{ $0 < 256 }> }
token d16 { (\d+) <?{ $0 < 65536 }> }
token h16 { (<:hexdigit>+) <?{ @$0 <= 4 }> }
token port {
':' <d16> { $*port = +$<d16> }
}
}
sub by8to16 (@m) { gather for @m -> $a,$b { take ($a * 256 + $b).fmt("%04x") } }
my @cases = <
127.0.0.1 127.0.0.1:80 ::1 [::1]:80 2605:2700:0:3::4713:93e3 [2605:2700:0:3::4713:93e3]:80 2001:db8:85a3:0:0:8a2e:370:7334 2001:db8:85a3::8a2e:370:7334 [2001:db8:85a3:8d3:1319:8a2e:370:7348]:443 192.168.0.1 ::ffff:192.168.0.1 ::ffff:71.19.147.227 [::ffff:71.19.147.227]:80 :: 256.0.0.0 g::1 0000 0000:0000 0000:0000:0000:0000:0000:0000:0000:0000 0000:0000:0000::0000:0000 0000::0000::0000:0000 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff ffff:ffff:ffff:fffg:ffff:ffff:ffff:ffff fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff fff:ffff:0:ffff:ffff:ffff:ffff:ffff
>;
for @cases -> $addr {
my @*by8; my @*by16; my $*port;
IP_Addr.parse($addr);
say $addr;
if @*by16 {
say " IPv6: ", @*by16».map({:16(~$_)})».fmt("%04x").join;
say " Port: ", $*port if $*port;
}
elsif @*by8 {
say " IPv4: ", @*by8».fmt("%02x").join;
say " Port: ", $*port if $*port;
}
else {
say " BOGUS!";
}
say ;
}</lang>
- Output:
127.0.0.1 IPv4: 7f000001 127.0.0.1:80 IPv4: 7f000001 Port: 80 ::1 IPv6: 00000000000000000000000000000001 [::1]:80 IPv6: 00000000000000000000000000000001 Port: 80 2605:2700:0:3::4713:93e3 IPv6: 260527000000000300000000471393e3 [2605:2700:0:3::4713:93e3]:80 IPv6: 260527000000000300000000471393e3 Port: 80 2001:db8:85a3:0:0:8a2e:370:7334 IPv6: 20010db885a3000000008a2e03707334 2001:db8:85a3::8a2e:370:7334 IPv6: 20010db885a3000000008a2e03707334 [2001:db8:85a3:8d3:1319:8a2e:370:7348]:443 IPv6: 20010db885a308d313198a2e03707348 Port: 443 192.168.0.1 IPv4: c0a80001 ::ffff:192.168.0.1 IPv6: 00000000000000000000ffffc0a80001 ::ffff:71.19.147.227 IPv6: 00000000000000000000ffff471393e3 [::ffff:71.19.147.227]:80 IPv6: 00000000000000000000ffff471393e3 Port: 80 :: BOGUS! 256.0.0.0 BOGUS! g::1 BOGUS! 0000 BOGUS! 0000:0000 BOGUS! 0000:0000:0000:0000:0000:0000:0000:0000 IPv6: 00000000000000000000000000000000 0000:0000:0000::0000:0000 IPv6: 00000000000000000000000000000000 0000::0000::0000:0000 IPv6: 00000000000000000000000000000000 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff IPv6: ffffffffffffffffffffffffffffffff ffff:ffff:ffff:fffg:ffff:ffff:ffff:ffff BOGUS! fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff IPv6: 0fffffffffffffffffffffffffffffff fff:ffff:0:ffff:ffff:ffff:ffff:ffff IPv6: 0fffffff0000ffffffffffffffffffff
PicoLisp
<lang PicoLisp># Return a cons pair of address and port: (address . port) (de ipAddress (Adr)
(use (@A @B @C @D @Port)
(cond
((match '("[" @A "]" ":" @Port) Adr)
(adrIPv6 (split @A ":") @Port) )
((match '("[" @A "]") Adr)
(adrIPv6 (split @A ":")) )
((match '(@A ":" @B ":" @C) Adr)
(adrIPv6 (cons @A @B (split @C ":"))) )
((match '(@A "." @B "." @C "." @D ":" @Port) Adr)
(adrIPv4 (list @A @B @C @D) @Port) )
((match '(@A "." @B "." @C "." @D) Adr)
(adrIPv4 (list @A @B @C @D)) )
(T (quit "Bad IP address" (pack Adr))) ) ) )
(de adrIPv4 (Lst Port)
(cons
(sum >> (-24 -16 -8 0) (mapcar format Lst))
(format Port) ) )
(de adrIPv6 (Lst Port)
(cons
(sum >>
(-112 -96 -80 -64 -48 -32 -16 0)
(mapcan
'((X)
(if X
(cons (hex X))
(need (- 9 (length Lst)) 0) ) ) # Handle '::'
(cons (or (car Lst) "0") (cdr Lst)) ) )
(format Port) ) )</lang>
Test: <lang PicoLisp>(for A
(quote
"127.0.0.1"
"127.0.0.1:80"
"::1"
"[::1]:80"
"2605:2700:0:3::4713:93e3"
"[2605:2700:0:3::4713:93e3]:80" )
(let I (ipAddress (chop A))
(tab (-29 34 40 7)
A
(hex (car I))
(format (car I))
(cdr I) ) ) )</lang>
Output:
127.0.0.1 7F000001 2130706433 127.0.0.1:80 7F000001 2130706433 80 ::1 1 1 [::1]:80 1 1 80 2605:2700:0:3::4713:93e3 260527000000000300000000471393E3 50537416338094019778974086937420469219 [2605:2700:0:3::4713:93e3]:80 260527000000000300000000471393E3 50537416338094019778974086937420469219 80
PL/I
<lang pli>*process or(!) source xref attributes macro options;
/*********************************************************************
* Program to parse an IP address into --> IPv4 or IPv6 format
* 28.05.2013 Walter Pachl translated from REXX version 3
* x2d was the hard part :-)
*********************************************************************/
ip: proc options(main);
Dcl ipa char(50) Var;
Dcl ipi char(50) Var;
Dcl ipax char(50) Var Init();
Dcl ipad char(50) Var Init();
Dcl space char(4);
Dcl port char(5) Var;
dcl head Char(132) Var;
head=' input IP address hex IP address '!!
' decimal IP address space port';
Put Edit(head)(Skip,a);
Put Edit(copies('_',30),
copies('_',32),
copies('_',39),
copies('_', 5),
copies('_', 5))
(Skip,6(a,x(1)));
call expand('127.0.0.1');
call expand('127.0.0.1:80');
call expand('2605:2700:0:3::4713:93e3');
call expand('[2605:2700:0:3::4713:93e3]:80');
call expand('::1');
call expand('[::1]:80');
expand: procedure(s);
Dcl s Char(50) Var;
ipi=s;
ipa=s;
If index(ipa,'.')>0 Then
Call expand_ipv4;
Else
Call expand_ipv6;
ipad=x2d(ipax);
Put Edit(left(ipi,30),right(ipax,32),right(ipad,39),
right(space,5),right(port,5))
(Skip,6(a,x(1)));
End;
expand_ipv4: Proc; Dcl a(4) Char(3) Var; Dcl (pp,j) Bin Fixed(31); space='IPv4'; pp=index(ipa,':'); If pp>0 Then Do; port=substr(ipa,pp+1); ipa=left(ipa,pp-1); End; Else Port=; Call parse((ipa),'.',a); ipax=; do j=1 To 4; ipax=ipax!!a(j); end; End;
expand_ipv6: Proc;
Dcl a(8) Char(4) Var;
Dcl (s,o1,o2) Char(50) Var Init();
Dcl (i,ii,pp,j,n) Bin Fixed(31) Init(0);
space='IPv6';
pp=index(ipa,']:');
If pp>0 Then Do;
port=substr(ipa,pp+2);
ipa=substr(ipa,2,pp-2);
End;
Else
Port=;
s=ipa;
j=0;
Do i=1 To 8 While(s>);
pp=index(s,':');
dcl temp Char(6) Var;
If pp>1 Then
temp=left(s,pp-1);
Else
temp=s;
temp=right(temp,4,'0');
Select(pp);
When(0) Do;
a(i)=temp;
s=;
End;
When(1) Do;
a(i)='----';
ii=i;
s=substr(s,pp+1);
If left(s,1)=':' Then
s=substr(s,2);
End;
Otherwise Do;
a(i)=temp;
s=substr(s,pp+1);
End;
End;
End;
n=i-1;
o1=;
o2=;
Do i=1 To n;
If i=ii Then Do;
o1=o1!!'----';
Do j=1 To 9-n;
o2=o2!!'0000';
End;
End;
Else Do;
o1=o1!!right(a(i),4,'0');
o2=o2!!right(a(i),4,'0');
End;
End;
ipax=o2;
End;
parse: Proc(s,c,a);
Dcl s Char(50) Var;
Dcl c Char( 1);
Dcl a(*) Char(*) Var;
Dcl (i,p) Bin Fixed(31);
a=;
Do i=1 By 1 While(length(s)>0);
p=index(s,c);
If p>0 Then Do;
a(i)=left(s,p-1);
s=substr(s,p+1);
End;
Else Do;
a(i)=s;
s=;
End;
End;
End;
/*
underscore: Proc(s) Returns(char(132) Var);
Dcl s Char(*);
Dcl r Char(length(s)) Var Init();
Dcl i Bin Fixed(31);
Dcl us Bit(1) Init('0'b);
Do i=1 To length(s)-1;
If substr(s,i,1)>' ' Then Do;
r=r!!'_';
us='1'b;
End;
Else Do;
If substr(s,i+1,1)>' ' & us Then
r=r!!'_';
Else Do;
r=r!!' ';
us='0'b;
End;
End;
End;
If substr(s,length(s),1)>' ' Then
r=r!!'_';
Return(r);
End;
center: Proc(s,l) Returns(char(50) Var);
Dcl s char(50) Var;
Dcl (l,b) Bin Fixed(31);
b=(l-length(s))/2;
Return(left(copies(' ',b)!!s,l));
End;
*/
copies: Proc(c,n) Returns(char(50) Var);
Dcl c char(50) Var;
Dcl n Bin Fixed(31);
Return(repeat(c,n-1));
End;
c2d: Procedure(s) Returns(Char(50) Var); Dcl s Char(*) Var; Dcl d Pic'99'; Dcl (v,part,result,old) Char(100) Var; Dcl i Bin Fixed(31); result='0'; v='1';
Do i=length(s) To 1 By -1;
d=c2d(substr(s,i,1));
part=longmult((v),(d));
result=longadd((result),(part));
v=longmult((v),'16');
End;
Do While(left(result,1)='0');
result=substr(result,2);
End;
Return(result);
/*
dbg: Proc(txt);
Dcl txt Char(*);
Put Skip list(txt);
End;
*/
x2d: Procedure(c) Returns(Char(2));
Dcl c Char(1);
Dcl res Char(2);
Select(c);
When('a','A') res='10';
When('b','B') res='11';
When('c','C') res='12';
When('d','D') res='13';
When('e','E') res='14';
When('f','F') res='15';
Otherwise res='0'!!c;
End;
Return(res);
End;
longmult: Procedure(as,bs) Returns(Char(1000) Var);
/* REXX **************************************************************
* Multiply(as,bs) -> as*bs
*********************************************************************/
Dcl (as,bs) Char(*);
Dcl (a(1000),b(1000),r(1000)) Pic'9';
Dcl (p,s) Pic'99';
Dcl (al,bl) Bin Fixed(31);
Dcl (i,ai,bi,ri,rim) Bin Fixed(31);
Dcl res Char(1000) Var Init((1000)'0');
al=length(as); Do ai=al To 1 By -1; a(ai)=substr(as,al-ai+1,1); End;
bl=length(bs); Do bi=bl To 1 By -1; b(bi)=substr(bs,bl-bi+1,1); End;
r=0;
rim=0;
Do bi=1 To bl;
Do ai=1 To al;
ri=ai+bi-1;
p=a(ai)*b(bi);
Do i=ri by 1 Until(p=0);
s=r(i)+p;
r(i)=mod(s,10);
p=s/10;
End;
rim=max(rim,i);
End;
End;
res=;
Do i=1 To rim;
res=r(i)!!res;
End;
Return(res);
End;
longadd: proc(as,bs) Returns(Char(100) Var); Dcl (as,bs) Char(*) Var; Dcl cs Char(100) Var Init(); Dcl (al,bl,cl,i) Bin Fixed(31); Dcl a(100) Pic'9' Init((100)0); Dcl b(100) Pic'9' Init((100)0); Dcl c(100) Pic'9' Init((100)0); Dcl temp Pic'99'; al=length(as); bl=length(bs); Do i=1 To al; a(i)=substr(as,al-i+1,1); End; Do i=1 To bl; b(i)=substr(bs,bl-i+1,1); End; cl=max(al,bl)+1; Do i=1 To cl; temp=a(i)+b(i)+c(i); c(i)=mod(temp,10); c(i+1)=c(i+1)+temp/10; End; Do i=1 To cl; cs=c(i)!!cs; End; Return(cs); End; End;
end;</lang>
Output:
input IP address hex IP address decimal IP address space port
______________________________ ________________________________ _______________________________________ _____ _____
127.0.0.1 127001 1208321 IPv4
127.0.0.1:80 127001 1208321 IPv4 80
2605:2700:0:3::4713:93e3 260527000000000300000000471393e3 50537416338094019778974086937420469219 IPv6
[2605:2700:0:3::4713:93e3]:80 260527000000000300000000471393e3 50537416338094019778974086937420469219 IPv6 80
::1 00000000000000000000000000000001 1 IPv6
[::1]:80 00000000000000000000000000000001 1 IPv6 80
Python
The following uses pyparse to parse the IP address. It's an attempt at using pyparse to describe an IP address in an extended BNF syntax. Using a parser does seems a bit like using a sledgehammer to crack a nut. However it does make for an interesting alternative to using a regular expressions to parse IP addresses. Note - for example - that the parser specifically reports - as an exception - the location where the IP address is syntactically wrong. <lang python>import string from pyparsing import * # import antigravity
tests="""# 127.0.0.1 # The "localhost" IPv4 address 127.0.0.1:80 # The "localhost" IPv4 address, with a specified port (80)
- 1 # The "localhost" IPv6 address
[::1]:80 # The "localhost" IPv6 address, with a specified port (80) 2605:2700:0:3::4713:93e3 # Rosetta Code's primary server's public IPv6 address [2605:2700:0:3::4713:93e3]:80 # Rosetta Code's primary server's public IPv6 address, +port (80) 2001:db8:85a3:0:0:8a2e:370:7334 # doc, IPv6 for 555-1234 2001:db8:85a3::8a2e:370:7334 # doc [2001:db8:85a3:8d3:1319:8a2e:370:7348]:443 # doc +port 192.168.0.1 # private
- ffff:192.168.0.1 # private transitional
- ffff:71.19.147.227 # Rosetta Code's transitional
[::ffff:71.19.147.227]:80 # Rosetta Code's transitional +port
- # unspecified
256.0.0.0 # invalid, octet > 255 (currently not detected) g::1 # invalid 0000 Bad address 0000:0000 Bad address 0000:0000:0000:0000:0000:0000:0000:0000 Good address 0000:0000:0000::0000:0000 Good Address 0000::0000::0000:0000 Bad address ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff Good address ffff:ffff:ffff:fffg:ffff:ffff:ffff:ffff Bad address fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff Good address fff:ffff:0:ffff:ffff:ffff:ffff:ffff Good address """
def print_args(args):
print "print_args:", args
def join(args):
args[0]="".join(args) del args[1:]
def replace(val):
def lambda_replace(args): args[0]=val del args[1:] return lambda_replace
def atoi(args): args[0]=string.atoi(args[0]) def itohex2(args): args[0]="%02x"%args[0]
def hextoi(args): args[0]=string.atoi(args[0], 16) def itohex4(args): args[0]="%04x"%args[0]
def assert_in_range(lwb, upb):
def range_check(args):
return # turn range checking off
if args[0] < lwb:
raise ValueError,"value %d < %d"%(args[0], lwb)
if args[0] > upb:
raise ValueError,"value %d > %d"%(args[0], upb)
return range_check
dot = Literal(".").suppress()("dot"); colon = Literal(":").suppress()("colon") octet = Word(nums).setParseAction(atoi,assert_in_range(0,255),itohex2)("octet");
port = Word(nums).setParseAction(atoi,assert_in_range(0,256*256-1))("port") ipv4 = (octet + (dot+octet)*3)("addr") ipv4.setParseAction(join) #,hextoi)
ipv4_port = ipv4+colon.suppress()+port
a2f = "abcdef" hex = oneOf(" ".join(nums+a2f));
hexet = (hex*(0,4))("hexet") hexet.setParseAction(join, hextoi, itohex4)
max=8; stop=max+1
xXXXX_etc = [None, hexet]; xXXXX_etc.extend([hexet + (colon+hexet)*n for n in range(1,max)]) x0000_etc = [ Literal("::").setParseAction(replace("0000"*num_x0000s)) for num_x0000s in range(stop) ]
ipv6=xXXXX_etc[-1]+x0000_etc[0] | xXXXX_etc[-1]
- Build a table of rules for IPv6, in particular the double colon
for num_prefix in range(max-1, -1, -1):
for num_x0000s in range(0,stop-num_prefix):
x0000 = x0000_etc[num_x0000s]
num_suffix=max-num_prefix-num_x0000s
if num_prefix:
if num_suffix: pat = xXXXX_etc[num_prefix]+x0000+xXXXX_etc[num_suffix]
else: pat = xXXXX_etc[num_prefix]+x0000
elif num_suffix: pat = x0000+xXXXX_etc[num_suffix]
else: pat=x0000
ipv6 = ipv6 | pat
ipv6.setParseAction(join) # ,hextoi) ipv6_port = Literal("[").suppress() + ipv6 + Literal("]").suppress()+colon+port
ipv6_transitional = (Literal("::ffff:").setParseAction(replace("0"*20+"ffff"))+ipv4).setParseAction(join) ipv6_transitional_port = Literal("[").suppress() + ipv6_transitional + Literal("]").suppress()+colon+port
ip_fmt = (
(ipv4_port|ipv4)("ipv4") |
(ipv6_transitional_port|ipv6_transitional|ipv6_port|ipv6)("ipv6")
) + LineEnd()
class IPAddr(object):
def __init__(self, string):
self.service = dict(zip(("address","port"), ip_fmt.parseString(string)[:]))
def __getitem__(self, key): return self.service[key]
def __contains__(self, key): return key in self.service
def __repr__(self): return `self.service` # "".join(self.service)
address=property(lambda self: self.service["address"])
port=property(lambda self: self.service["port"])
is_service=property(lambda self: "port" in self.service)
version=property(lambda self: {False:4, True:6}[len(self.address)>8])
for test in tests.splitlines():
if not test.startswith("#"):
ip_str, desc = test.split(None,1)
print ip_str,"=>",
try:
ip=IPAddr(ip_str)
print ip, "IP Version:",ip.version,"- Address is OK!",
except (ParseException,ValueError), details: print "Bad! IP address syntax error detected:",details,
print "- Actually:",desc</lang>
Output:
127.0.0.1 => {'address': '7f000001'} IP Version: 4 - Address is OK! - Actually: # The "localhost" IPv4 address
127.0.0.1:80 => {'port': 80, 'address': '7f000001'} IP Version: 4 - Address is OK! - Actually: # The "localhost" IPv4 address, with a specifie
d port (80)
::1 => {'address': '00000000000000000000000000000001'} IP Version: 6 - Address is OK! - Actually: # The "localhost" IPv6 address
[::1]:80 => {'port': 80, 'address': '00000000000000000000000000000001'} IP Version: 6 - Address is OK! - Actually: # The "localhost" IPv6 addr
ess, with a specified port (80)
2605:2700:0:3::4713:93e3 => {'address': '260527000000000300000000471393e3'} IP Version: 6 - Address is OK! - Actually: # Rosetta Code's primar
y server's public IPv6 address
[2605:2700:0:3::4713:93e3]:80 => {'port': 80, 'address': '260527000000000300000000471393e3'} IP Version: 6 - Address is OK! - Actually: # Rose
tta Code's primary server's public IPv6 address, +port (80)
2001:db8:85a3:0:0:8a2e:370:7334 => {'address': '20010db885a3000000008a2e03707334'} IP Version: 6 - Address is OK! - Actually: # doc, IPv6 for
555-1234
2001:db8:85a3::8a2e:370:7334 => {'address': '20010db885a3000000008a2e03707334'} IP Version: 6 - Address is OK! - Actually: # doc
[2001:db8:85a3:8d3:1319:8a2e:370:7348]:443 => {'port': 443, 'address': '20010db885a308d313198a2e03707348'} IP Version: 6 - Address is OK! - Ac
tually: # doc +port
192.168.0.1 => {'address': 'c0a80001'} IP Version: 4 - Address is OK! - Actually: # private
::ffff:192.168.0.1 => {'address': '00000000000000000000ffffc0a80001'} IP Version: 6 - Address is OK! - Actually: # private transitional
::ffff:71.19.147.227 => {'address': '00000000000000000000ffff471393e3'} IP Version: 6 - Address is OK! - Actually: # Rosetta Code's transition
al
[::ffff:71.19.147.227]:80 => {'port': 80, 'address': '00000000000000000000ffff471393e3'} IP Version: 6 - Address is OK! - Actually: # Rosetta
Code's transitional +port
:: => {'address': '00000000000000000000000000000000'} IP Version: 6 - Address is OK! - Actually: # unspecified
256.0.0.0 => {'address': '100000000'} IP Version: 6 - Address is OK! - Actually: # invalid, octet > 255 (currently not detected)
g::1 => Bad! IP address syntax error detected: (at char 4), (line:1, col:5) - Actually: # invalid
0000 => Bad! IP address syntax error detected: Expected "." (at char 4), (line:1, col:5) - Actually: Bad address
0000:0000 => Bad! IP address syntax error detected: Expected ":" (at char 9), (line:1, col:10) - Actually: Bad address
0000:0000:0000:0000:0000:0000:0000:0000 => {'address': '00000000000000000000000000000000'} IP Version: 6 - Address is OK! - Actually: Good add
ress
0000:0000:0000::0000:0000 => {'address': '00000000000000000000000000000000'} IP Version: 6 - Address is OK! - Actually: Good Address
0000::0000::0000:0000 => Bad! IP address syntax error detected: Expected end of line (at char 10), (line:1, col:11) - Actually: Bad address
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff => {'address': 'ffffffffffffffffffffffffffffffff'} IP Version: 6 - Address is OK! - Actually: Good add
ress
ffff:ffff:ffff:fffg:ffff:ffff:ffff:ffff => Bad! IP address syntax error detected: Expected ":" (at char 18), (line:1, col:19) - Actually: Bad
address
fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff => {'address': '0fffffffffffffffffffffffffffffff'} IP Version: 6 - Address is OK! - Actually: Good addr
ess
fff:ffff:0:ffff:ffff:ffff:ffff:ffff => {'address': '0fffffff0000ffffffffffffffffffff'} IP Version: 6 - Address is OK! - Actually: Good address
Racket
<lang racket>
- lang racket
(require net/private/ip)
(define (bytes->hex bs)
(string-append* (map (λ(n) (~r n #:base 16 #:min-width 2 #:pad-string "0"))
(bytes->list bs))))
(define (parse-ip str)
(define-values [ipstr portstr]
(match str
[(regexp #rx"^([0-9.]+):([0-9]+)$" (list _ i p)) (values i p)]
[(regexp #rx"^\\[([0-9a-fA-F:]+)\\]:([0-9]+)$" (list _ i p)) (values i p)]
[_ (values str "")]))
(define ip (make-ip-address ipstr))
(define 4? (ipv4? ip))
(define hex (bytes->hex ((if 4? ipv4-bytes ipv6-bytes) ip)))
(displayln (~a (~a str #:min-width 30)
" "
(~a hex #:min-width 32 #:align 'right)
" ipv" (if 4? "4" "6") " " portstr)))
(for-each parse-ip
'("127.0.0.1"
"127.0.0.1:80"
"::1"
"[::1]:80"
"2605:2700:0:3::4713:93e3"
"[2605:2700:0:3::4713:93e3]:80"))
</lang>
- Output:
127.0.0.1 7f000001 ipv4 127.0.0.1:80 7f000001 ipv4 80 ::1 00000000000000000000000000000001 ipv6 [::1]:80 00000000000000000000000000000001 ipv6 80 2605:2700:0:3::4713:93e3 260527000000000300000000471393e3 ipv6 [2605:2700:0:3::4713:93e3]:80 260527000000000300000000471393e3 ipv6 80
REXX
One of REXX's strongest features is its ability for parsing, it has PARSE instruction for this purpose.
version 1
<lang rexx>/*REXX program to parse an IP address into ──► IPv4 or IPv6 format, port*/
say center('input IP address' ,30),
center('hex IP address' ,32),
center('decimal IP address' ,39) 'space port'
_='─'
say copies(_,30) copies(_,32) copies(_,39) copies(_,5) copies(_,5)
call IP_parse 127.0.0.1 /*this IP doesn't need quotes. */ call IP_parse '127.0.0.1:80' call IP_parse '::1' call IP_parse '[::1]:80' call IP_parse '2605:2700:0:3::4713:93e3' call IP_parse '[2605:2700:0:3::4713:93e3]:80' exit /*stick a fork in it, we're done.*/ /*──────────────────────────────────IP_parse subroutine─────────────────*/ IP_parse: procedure; parse arg a .; hx=; @.=; numeric digits 50 dot=pos('.',a)\==0 /*see if there is a dot present. */
if dot then do; parse var a @.1 '.' @.2 "." @.3 '.' @.4 ":" port
do j=1 for 4; hx=hx || d2x(@.j,2)
end /*j*/
end /*if dot*/
else do; parse var a pureA ']:' port
_=space(translate(pureA,,'[]'),0) /*remove brackets*/
parse var _ x '::' y
do L=1 until x== /*get left side.*/
parse var x @.L ':' x
end /*L*/
y=reverse(y)
do r=8 by -1 /*get right side.*/
parse var y z ':' y; if z== then leave
@.r=reverse(z)
end /*r*/
do k=1 for 8; hx=hx || right(word(@.k 0, 1), 4, 0)
end /*k*/
end /*else dot*/
say left(a,30) right(hx,32) right(x2d(hx),39) ' IPv'||(6-2*dot) right(port,5) return</lang> output using the default input
input IP address hex IP address decimal IP address space port ────────────────────────────── ──────────────────────────────── ─────────────────────────────────────── ───── ───── 127.0.0.1 7F000001 2130706433 IPv4 127.0.0.1:80 7F000001 2130706433 IPv4 80 ::1 00000000000000000000000000000001 1 IPv6 [::1]:80 00000000000000000000000000000001 1 IPv6 80 2605:2700:0:3::4713:93e3 260527000000000300000000471393e3 50537416338094019778974086937420469219 IPv6 [2605:2700:0:3::4713:93e3]:80 260527000000000300000000471393e3 50537416338094019778974086937420469219 IPv6 80
version 2
<lang rexx>/* REXX ***************************************************************
- 27.05.2013 Walter Pachl
- /
Numeric Digits 100 say center('input IP address' ,30),
center('hex IP address' ,32),
center('decimal IP address' ,39) 'space port'
say copies(_,30) copies(_,32) copies(_,39) copies(_,5) copies(_,5) /*hdr*/ call expand '127.0.0.1' call expand '127.0.0.1:80' call expand '::1' call expand '[::1]:80' call expand '2605:2700:0:3::4713:93e3' call expand '[2605:2700:0:3::4713:93e3]:80' Say ' ' Say 'The following 2 are the same' Call expand '2001:0db8:0:0:0:0:1428:57ab' Call expand '2001:db8::1428:57ab' Say ' ' Say 'The following 3 are all the same' Call expand '2001:0db8:0:0:8d3:0:0:0' Call expand '2001:db8:0:0:8d3::' Call expand '2001:db8::8d3:0:0:0' Exit
expand: Procedure Parse Arg s If pos('.',s)>0 Then
Parse Value expand_ip4(s) With exp space port
Else
Parse Value expand_ip6(s) With exp space port
Say left(s,30) right(exp,32) right(x2d(exp),39) right(space,5) right(port,5) Return
expand_ip4: Procedure Parse Arg s If pos(':',s)>0 Then
Parse Var s s ':' port
Else
port=
Do i=1 To 4
Parse Var s a.i '.' s End
res= Do i=1 To 4
res=res||d2x(a.i,2) End
Return res 'IPv4' port
expand_ip6: Procedure /**********************************************************************
- Note: Doublecolon ('::') requires the inclusion of as many 0000
- tokens as necessary to result in 8 tokens
- /
Parse Arg s If pos(']:',s)>0 Then
Parse Var s '[' s ']:' port
Else
port=
sc=s ii=0 Do i=1 To 8 While s<>
Parse Var s x.i ':' s If left(s,1)=':' Then Do ii=i s=substr(s,2) End End
n=i-1 ol= o2= Do i=1 To n
ol=ol||right(x.i,4,'0')
o2=o2||right(x.i,4,'0')
If i=ii Then Do
ol=ol||'----'
Do j=1 To 8-n
o2=o2||'0000'
End
End
End
Return o2 'IPv6' port</lang> Output:
input IP address hex IP address decimal IP address space port
______________________________ ________________________________ _______________________________________ _____ _____
127.0.0.1 7F000001 2130706433 IPv4
127.0.0.1:80 7F000001 2130706433 IPv4 80
::1 00000000000000000000000000000001 1 IPv6
[::1]:80 00000000000000000000000000000001 1 IPv6 80
2605:2700:0:3::4713:93e3 260527000000000300000000471393e3 50537416338094019778974086937420469219 IPv6
[2605:2700:0:3::4713:93e3]:80 260527000000000300000000471393e3 50537416338094019778974086937420469219 IPv6 80
The following 2 are the same
2001:0db8:0:0:0:0:1428:57ab 20010db80000000000000000142857ab 42540766411282592856903984951992014763 IPv6
2001:db8::1428:57ab 20010db80000000000000000142857ab 42540766411282592856903984951992014763 IPv6
The following 3 are all the same
2001:0db8:0:0:8d3:0:0:0 20010db80000000008d3000000000000 42540766411282592857539836924043198464 IPv6
2001:db8:0:0:8d3:: 20010db80000000008d3000000000000 42540766411282592857539836924043198464 IPv6
2001:db8::8d3:0:0:0 20010db80000000008d3000000000000 42540766411282592857539836924043198464 IPv6
Ruby
Ruby 1.9.2 has better IPv6 support than older versions. This script uses class Addrinfo from Ruby 1.9.2.
<lang ruby>require 'socket' require 'ipaddr'
IP_ADDRESSES = ["127.0.0.1", "127.0.0.1:80",
"::1", "[::1]:80",
"2605:2700:0:3::4713:93e3", "[2605:2700:0:3::4713:93e3]:80",
"fe80::1%lo0", "1600 Pennsylvania Avenue NW"]
output = [] output << %w(String Address Port Family Hex Scope?) output << %w(------ ------- ---- ------ --- ------)
- Parse _string_ for an IP address and optional port number. Returns
- them in an Addrinfo object.
def parse_addr(string)
# Split host and port number from string. case string when /\A\[(?<address> .* )\]:(?<port> \d+ )\z/x # string like "[::1]:80" address, port = $~[:address], $~[:port] when /\A(?<address> [^:]+ ):(?<port> \d+ )\z/x # string like "127.0.0.1:80" address, port = $~[:address], $~[:port] else # string with no port number address, port = string, nil end
# Pass address, port to Addrinfo.getaddrinfo. It will raise SocketError if address or port is not valid. # IPAddr currently cannot handle ::1 notation, use Addrinfo instead ary = Addrinfo.getaddrinfo(address, port)
# An IP address is exactly one address.
ary.size == 1 or raise SocketError, "expected 1 address, found #{ary.size}"
ary.first
end
def output_table(rows)
widths = []
rows.each {|row| row.each_with_index {|col, i| widths[i] = [widths[i].to_i, col.to_s.length].max }}
format = widths.map {|size| "%#{size}s"}.join("\t")
rows.each {|row| puts format % row}
end
family_hash = {Socket::AF_INET => "ipv4", Socket::AF_INET6 => "ipv6"}
IP_ADDRESSES.each do |string|
begin addr = parse_addr(string) rescue SocketError output << [string, "illegal address", ,,,] else (cur_string ||= []) << string << addr.ip_address << addr.ip_port.to_s << family_hash[addr.afamily] # for output
# Show address in hexadecimal. We must unpack it from sockaddr string.
if addr.ipv4?
# network byte order "N"
cur_string << "0x%08x" % IPAddr.new(addr.ip_address).hton.unpack('N') << ""
elsif addr.ipv6?
# 32 bytes for address, network byte order "N4"
cur_string << "0x%032x" % IPAddr.new(addr.ip_address).to_i
cur_string << (addr.ipv6_linklocal? ? ary[4] : "") # for Scope
end
output << cur_string
end
end
output_table output </lang>
String Address Port Family Hex Scope?
------ ------- ---- ------ --- ------
127.0.0.1 127.0.0.1 0 ipv4 0x7f000001
127.0.0.1:80 127.0.0.1 80 ipv4 0x7f000001
::1 ::1 0 ipv6 0x00000000000000000000000000000001
[::1]:80 ::1 80 ipv6 0x00000000000000000000000000000001
2605:2700:0:3::4713:93e3 2605:2700:0:3::4713:93e3 0 ipv6 0x260527000000000300000000471393e3
[2605:2700:0:3::4713:93e3]:80 2605:2700:0:3::4713:93e3 80 ipv6 0x260527000000000300000000471393e3
fe80::1%lo0 illegal address
1600 Pennsylvania Avenue NW illegal address
With BSD, fe80::1%lo0 is a link-local address. With other systems, fe80::1%lo0 might be illegal address, because lo0 is not valid scope identifier.
Tcl
<lang tcl>package require Tcl 8.5 package require ip
proc parseIP {address} {
set result {}
set family [ip::version $address]
set port -1
if {$family == -1} {
if {[regexp {^\[(.*)\]:(\d+)$} $address -> address port]} { dict set result port $port set family [ip::version $address] if {$family != 6} { return -code error "bad address" } } elseif {[regexp {^(.*):(\d+)$} $address -> address port]} { dict set result port $port set family [ip::version $address] if {$family != 4} { return -code error "bad address" } } else { return -code error "bad address" }
}
# Only possible error in ports is to be too large an integer
if {$port > 65535} {
return -code error "bad port"
}
dict set result family $family
if {$family == 4} {
# IPv4 normalized form is dotted quad, but toInteger helps dict set result addr [format %x [ip::toInteger $address]]
} else {
# IPv6 normalized form is colin-separated hex dict set result addr [string map {: ""} [ip::normalize $address]]
} # Return the descriptor dictionary return $result
}</lang> Demonstration code: <lang tcl>foreach address {
127.0.0.1 127.0.0.1:80 ::1 [::1]:80 2605:2700:0:3::4713:93e3 [2605:2700:0:3::4713:93e3]:80 ::ffff:192.168.0.1 [::ffff:192.168.0.1]:22 ::ffff:127.0.0.0.1 a::b::1 127.0.0.1:100000
} {
if {[catch {
set parsed [parseIP $address]
} msg]} {
puts "error ${msg}: \"$address\"" continue
}
dict with parsed {
puts -nonewline "family: IPv$family addr: $addr" if {[dict exists $parsed port]} { puts -nonewline " port: $port" } puts ""
}
}</lang> Output:
family: IPv4 addr: 7f000001 family: IPv4 addr: 7f000001 port: 80 family: IPv6 addr: 00000000000000000000000000000001 family: IPv6 addr: 00000000000000000000000000000001 port: 80 family: IPv6 addr: 260527000000000300000000471393e3 family: IPv6 addr: 260527000000000300000000471393e3 port: 80 family: IPv6 addr: 00000000000000000000ffffc0a80001 family: IPv6 addr: 00000000000000000000ffffc0a80001 port: 22 error bad address: "::ffff:127.0.0.0.1" error bad address: "a::b::1" error bad port: "127.0.0.1:100000"