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author | Ondřej Surý <ondrej@sury.org> | 2011-09-13 13:13:40 +0200 |
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committer | Ondřej Surý <ondrej@sury.org> | 2011-09-13 13:13:40 +0200 |
commit | 5ff4c17907d5b19510a62e08fd8d3b11e62b431d (patch) | |
tree | c0650497e988f47be9c6f2324fa692a52dea82e1 /src/pkg/net/lookup_unix.go | |
parent | 80f18fc933cf3f3e829c5455a1023d69f7b86e52 (diff) | |
download | golang-upstream/60.tar.gz |
Imported Upstream version 60upstream/60
Diffstat (limited to 'src/pkg/net/lookup_unix.go')
-rw-r--r-- | src/pkg/net/lookup_unix.go | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/pkg/net/lookup_unix.go b/src/pkg/net/lookup_unix.go new file mode 100644 index 000000000..8f5e66212 --- /dev/null +++ b/src/pkg/net/lookup_unix.go @@ -0,0 +1,111 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package net + +import ( + "os" +) + +// LookupHost looks up the given host using the local resolver. +// It returns an array of that host's addresses. +func LookupHost(host string) (addrs []string, err os.Error) { + addrs, err, ok := cgoLookupHost(host) + if !ok { + addrs, err = goLookupHost(host) + } + return +} + +// LookupIP looks up host using the local resolver. +// It returns an array of that host's IPv4 and IPv6 addresses. +func LookupIP(host string) (addrs []IP, err os.Error) { + addrs, err, ok := cgoLookupIP(host) + if !ok { + addrs, err = goLookupIP(host) + } + return +} + +// LookupPort looks up the port for the given network and service. +func LookupPort(network, service string) (port int, err os.Error) { + port, err, ok := cgoLookupPort(network, service) + if !ok { + port, err = goLookupPort(network, service) + } + return +} + +// LookupCNAME returns the canonical DNS host for the given name. +// Callers that do not care about the canonical name can call +// LookupHost or LookupIP directly; both take care of resolving +// the canonical name as part of the lookup. +func LookupCNAME(name string) (cname string, err os.Error) { + cname, err, ok := cgoLookupCNAME(name) + if !ok { + cname, err = goLookupCNAME(name) + } + return +} + +// LookupSRV tries to resolve an SRV query of the given service, +// protocol, and domain name, as specified in RFC 2782. In most cases +// the proto argument can be the same as the corresponding +// Addr.Network(). The returned records are sorted by priority +// and randomized by weight within a priority. +func LookupSRV(service, proto, name string) (cname string, addrs []*SRV, err os.Error) { + target := "_" + service + "._" + proto + "." + name + var records []dnsRR + cname, records, err = lookup(target, dnsTypeSRV) + if err != nil { + return + } + addrs = make([]*SRV, len(records)) + for i, rr := range records { + r := rr.(*dnsRR_SRV) + addrs[i] = &SRV{r.Target, r.Port, r.Priority, r.Weight} + } + byPriorityWeight(addrs).sort() + return +} + +// LookupMX returns the DNS MX records for the given domain name sorted by preference. +func LookupMX(name string) (mx []*MX, err os.Error) { + _, rr, err := lookup(name, dnsTypeMX) + if err != nil { + return + } + mx = make([]*MX, len(rr)) + for i := range rr { + r := rr[i].(*dnsRR_MX) + mx[i] = &MX{r.Mx, r.Pref} + } + byPref(mx).sort() + return +} + +// LookupAddr performs a reverse lookup for the given address, returning a list +// of names mapping to that address. +func LookupAddr(addr string) (name []string, err os.Error) { + name = lookupStaticAddr(addr) + if len(name) > 0 { + return + } + var arpa string + arpa, err = reverseaddr(addr) + if err != nil { + return + } + var records []dnsRR + _, records, err = lookup(arpa, dnsTypePTR) + if err != nil { + return + } + name = make([]string, len(records)) + for i := range records { + r := records[i].(*dnsRR_PTR) + name[i] = r.Ptr + } + return +} |