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host and port name lookup

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R=r,presotto
DELTA=1239  (935 added, 281 deleted, 23 changed)
OCL=21041
CL=21539
This commit is contained in:
Russ Cox 2008-12-18 15:42:39 -08:00
parent e29ce175ed
commit 83348f956e
15 changed files with 886 additions and 244 deletions
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60
src/lib/net/ip.go
View file

@ -12,6 +12,10 @@
package net
import (
"net"
)
export const (
IPv4len = 4;
IPv6len = 16
@ -240,58 +244,6 @@ export func MaskToString(mask *[]byte) string {
return IPToString(mask)
}
// Parsing.
// Bigger than we need, not too big to worry about overflow
const Big = 0xFFFFFF
// Decimal to integer starting at &s[i].
// Returns number, new offset, success.
func dtoi(s string, i int) (n int, i1 int, ok bool) {
if len(s) <= i || s[i] < '0' || s[i] > '9' {
return 0, i, false
}
n = 0;
for ; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
n = n*10 + int(s[i] - '0');
if n >= Big {
return 0, i, false
}
}
return n, i, true
}
// Is b a hex digit?
func ishex(b byte) bool {
return '0' <= b && b <= '9'
|| 'a' <= b && b <= 'f'
|| 'A' <= b && b <= 'F'
}
// Hexadecimal to integer starting at &s[i].
// Returns number, new offset, success.
func xtoi(s string, i int) (n int, i1 int, ok bool) {
if len(s) <= i || !ishex(s[i]) {
return 0, i, false
}
n = 0;
for ; i < len(s) && ishex(s[i]); i++ {
n *= 16;
if '0' <= s[i] && s[i] <= '9' {
n += int(s[i] - '0')
} else if 'a' <= s[i] && s[i] <= 'f' {
n += int(s[i] - 'a') + 10
} else {
n += int(s[i] -'A') + 10
}
if n >= Big {
return 0, i, false
}
}
return n, i, true
}
// Parse IPv4 address (d.d.d.d).
func ParseIPv4(s string) *[]byte {
var p [IPv4len]byte;
@ -307,7 +259,7 @@ func ParseIPv4(s string) *[]byte {
n int;
ok bool
)
n, i, ok = dtoi(s, i);
n, i, ok = Dtoi(s, i);
if !ok || n > 0xFF {
return nil
}
@ -346,7 +298,7 @@ func ParseIPv6(s string) *[]byte {
j := 0;
L: for j < IPv6len {
// Hex number.
n, i1, ok := xtoi(s, i);
n, i1, ok := Xtoi(s, i);
if !ok || n > 0xFFFF {
return nil
}