diff options
Diffstat (limited to 'libgo/go/net/dnsconfig_unix.go')
| -rw-r--r-- | libgo/go/net/dnsconfig_unix.go | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/libgo/go/net/dnsconfig_unix.go b/libgo/go/net/dnsconfig_unix.go index aec575e8541..9c8108d11cb 100644 --- a/libgo/go/net/dnsconfig_unix.go +++ b/libgo/go/net/dnsconfig_unix.go @@ -10,6 +10,7 @@ package net import ( "os" + "sync/atomic" "time" ) @@ -29,6 +30,7 @@ type dnsConfig struct { lookup []string // OpenBSD top-level database "lookup" order err error // any error that occurs during open of resolv.conf mtime time.Time // time of resolv.conf modification + soffset uint32 // used by serverOffset } // See resolv.conf(5) on a Linux machine. @@ -91,19 +93,21 @@ func dnsReadConfig(filename string) *dnsConfig { for _, s := range f[1:] { switch { case hasPrefix(s, "ndots:"): - n, _, _ := dtoi(s, 6) - if n < 1 { - n = 1 + n, _, _ := dtoi(s[6:]) + if n < 0 { + n = 0 + } else if n > 15 { + n = 15 } conf.ndots = n case hasPrefix(s, "timeout:"): - n, _, _ := dtoi(s, 8) + n, _, _ := dtoi(s[8:]) if n < 1 { n = 1 } conf.timeout = time.Duration(n) * time.Second case hasPrefix(s, "attempts:"): - n, _, _ := dtoi(s, 9) + n, _, _ := dtoi(s[9:]) if n < 1 { n = 1 } @@ -134,6 +138,17 @@ func dnsReadConfig(filename string) *dnsConfig { return conf } +// serverOffset returns an offset that can be used to determine +// indices of servers in c.servers when making queries. +// When the rotate option is enabled, this offset increases. +// Otherwise it is always 0. +func (c *dnsConfig) serverOffset() uint32 { + if c.rotate { + return atomic.AddUint32(&c.soffset, 1) - 1 // return 0 to start + } + return 0 +} + func dnsDefaultSearch() []string { hn, err := getHostname() if err != nil { |