diff options
Diffstat (limited to 'libgo/go/net/dnsconfig_unix.go')
| -rw-r--r-- | libgo/go/net/dnsconfig_unix.go | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/libgo/go/net/dnsconfig_unix.go b/libgo/go/net/dnsconfig_unix.go index 58ae4a35b75..b76b32fb253 100644 --- a/libgo/go/net/dnsconfig_unix.go +++ b/libgo/go/net/dnsconfig_unix.go @@ -21,17 +21,19 @@ var ( ) type dnsConfig struct { - servers []string // server addresses (in host:port form) to use - search []string // rooted suffixes to append to local name - ndots int // number of dots in name to trigger absolute lookup - timeout time.Duration // wait before giving up on a query, including retries - attempts int // lost packets before giving up on server - rotate bool // round robin among servers - unknownOpt bool // anything unknown was encountered - 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 + servers []string // server addresses (in host:port form) to use + search []string // rooted suffixes to append to local name + ndots int // number of dots in name to trigger absolute lookup + timeout time.Duration // wait before giving up on a query, including retries + attempts int // lost packets before giving up on server + rotate bool // round robin among servers + unknownOpt bool // anything unknown was encountered + 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 + singleRequest bool // use sequential A and AAAA queries instead of parallel queries + useTCP bool // force usage of TCP for DNS resolutions } // See resolv.conf(5) on a Linux machine. @@ -115,6 +117,21 @@ func dnsReadConfig(filename string) *dnsConfig { conf.attempts = n case s == "rotate": conf.rotate = true + case s == "single-request" || s == "single-request-reopen": + // Linux option: + // http://man7.org/linux/man-pages/man5/resolv.conf.5.html + // "By default, glibc performs IPv4 and IPv6 lookups in parallel [...] + // This option disables the behavior and makes glibc + // perform the IPv6 and IPv4 requests sequentially." + conf.singleRequest = true + case s == "use-vc" || s == "usevc" || s == "tcp": + // Linux (use-vc), FreeBSD (usevc) and OpenBSD (tcp) option: + // http://man7.org/linux/man-pages/man5/resolv.conf.5.html + // "Sets RES_USEVC in _res.options. + // This option forces the use of TCP for DNS resolutions." + // https://www.freebsd.org/cgi/man.cgi?query=resolv.conf&sektion=5&manpath=freebsd-release-ports + // https://man.openbsd.org/resolv.conf.5 + conf.useTCP = true default: conf.unknownOpt = true } |