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path: root/libgo/go/net/cgo_unix.go
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Diffstat (limited to 'libgo/go/net/cgo_unix.go')
-rw-r--r--libgo/go/net/cgo_unix.go182
1 files changed, 135 insertions, 47 deletions
diff --git a/libgo/go/net/cgo_unix.go b/libgo/go/net/cgo_unix.go
index 0abf43410e1..8eafa8cbd44 100644
--- a/libgo/go/net/cgo_unix.go
+++ b/libgo/go/net/cgo_unix.go
@@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-// +build !netgo
-// +build darwin dragonfly freebsd linux netbsd openbsd
+// +build cgo,!netgo
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package net
@@ -42,24 +42,30 @@ func bytePtrToString(p *byte) string {
return string(a[:i])
}
-func cgoLookupHost(name string) (addrs []string, err error, completed bool) {
- ip, err, completed := cgoLookupIP(name)
- for _, p := range ip {
- addrs = append(addrs, p.String())
+// An addrinfoErrno represents a getaddrinfo, getnameinfo-specific
+// error number. It's a signed number and a zero value is a non-error
+// by convention.
+type addrinfoErrno int
+
+func (eai addrinfoErrno) Error() string { return bytePtrToString(libc_gai_strerror(int(eai))) }
+func (eai addrinfoErrno) Temporary() bool { return eai == syscall.EAI_AGAIN }
+func (eai addrinfoErrno) Timeout() bool { return false }
+
+func cgoLookupHost(name string) (hosts []string, err error, completed bool) {
+ addrs, err, completed := cgoLookupIP(name)
+ for _, addr := range addrs {
+ hosts = append(hosts, addr.String())
}
return
}
-func cgoLookupPort(net, service string) (port int, err error, completed bool) {
+func cgoLookupPort(network, service string) (port int, err error, completed bool) {
acquireThread()
defer releaseThread()
- var res *syscall.Addrinfo
var hints syscall.Addrinfo
-
- switch net {
- case "":
- // no hints
+ switch network {
+ case "": // no hints
case "tcp", "tcp4", "tcp6":
hints.Ai_socktype = syscall.SOCK_STREAM
hints.Ai_protocol = syscall.IPPROTO_TCP
@@ -67,10 +73,10 @@ func cgoLookupPort(net, service string) (port int, err error, completed bool) {
hints.Ai_socktype = syscall.SOCK_DGRAM
hints.Ai_protocol = syscall.IPPROTO_UDP
default:
- return 0, UnknownNetworkError(net), true
+ return 0, &DNSError{Err: "unknown network", Name: network + "/" + service}, true
}
- if len(net) >= 4 {
- switch net[3] {
+ if len(network) >= 4 {
+ switch network[3] {
case '4':
hints.Ai_family = syscall.AF_INET
case '6':
@@ -79,48 +85,56 @@ func cgoLookupPort(net, service string) (port int, err error, completed bool) {
}
s := syscall.StringBytePtr(service)
+ var res *syscall.Addrinfo
syscall.Entersyscall()
gerrno := libc_getaddrinfo(nil, s, &hints, &res)
syscall.Exitsyscall()
- if gerrno == 0 {
- defer libc_freeaddrinfo(res)
- for r := res; r != nil; r = r.Ai_next {
- switch r.Ai_family {
- default:
- continue
- case syscall.AF_INET:
- sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.Ai_addr))
- p := (*[2]byte)(unsafe.Pointer(&sa.Port))
- return int(p[0])<<8 | int(p[1]), nil, true
- case syscall.AF_INET6:
- sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.Ai_addr))
- p := (*[2]byte)(unsafe.Pointer(&sa.Port))
- return int(p[0])<<8 | int(p[1]), nil, true
+ if gerrno != 0 {
+ switch gerrno {
+ case syscall.EAI_SYSTEM:
+ errno := syscall.GetErrno()
+ if errno == 0 { // see golang.org/issue/6232
+ errno = syscall.EMFILE
}
+ err = errno
+ default:
+ err = addrinfoErrno(gerrno)
}
+ return 0, &DNSError{Err: err.Error(), Name: network + "/" + service}, true
}
- return 0, &AddrError{"unknown port", net + "/" + service}, true
+ defer libc_freeaddrinfo(res)
+
+ for r := res; r != nil; r = r.Ai_next {
+ switch r.Ai_family {
+ case syscall.AF_INET:
+ sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.Ai_addr))
+ p := (*[2]byte)(unsafe.Pointer(&sa.Port))
+ return int(p[0])<<8 | int(p[1]), nil, true
+ case syscall.AF_INET6:
+ sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.Ai_addr))
+ p := (*[2]byte)(unsafe.Pointer(&sa.Port))
+ return int(p[0])<<8 | int(p[1]), nil, true
+ }
+ }
+ return 0, &DNSError{Err: "unknown port", Name: network + "/" + service}, true
}
-func cgoLookupIPCNAME(name string) (addrs []IP, cname string, err error, completed bool) {
+func cgoLookupIPCNAME(name string) (addrs []IPAddr, cname string, err error, completed bool) {
acquireThread()
defer releaseThread()
- var res *syscall.Addrinfo
var hints syscall.Addrinfo
-
- hints.Ai_flags = int32(cgoAddrInfoFlags())
+ hints.Ai_flags = int32(cgoAddrInfoFlags)
hints.Ai_socktype = syscall.SOCK_STREAM
h := syscall.StringBytePtr(name)
+ var res *syscall.Addrinfo
syscall.Entersyscall()
gerrno := libc_getaddrinfo(h, nil, &hints, &res)
syscall.Exitsyscall()
if gerrno != 0 {
- var str string
- if gerrno == syscall.EAI_NONAME {
- str = noSuchHost
- } else if gerrno == syscall.EAI_SYSTEM {
+ switch gerrno {
+ case syscall.EAI_SYSTEM:
errno := syscall.GetErrno()
if errno == 0 {
// err should not be nil, but sometimes getaddrinfo returns
@@ -132,13 +146,16 @@ func cgoLookupIPCNAME(name string) (addrs []IP, cname string, err error, complet
// comes up again. golang.org/issue/6232.
errno = syscall.EMFILE
}
- str = errno.Error()
- } else {
- str = bytePtrToString(libc_gai_strerror(gerrno))
+ err = errno
+ case syscall.EAI_NONAME:
+ err = errNoSuchHost
+ default:
+ err = addrinfoErrno(gerrno)
}
- return nil, "", &DNSError{Err: str, Name: name}, true
+ return nil, "", &DNSError{Err: err.Error(), Name: name}, true
}
defer libc_freeaddrinfo(res)
+
if res != nil {
cname = bytePtrToString((*byte)(unsafe.Pointer(res.Ai_canonname)))
if cname == "" {
@@ -154,20 +171,20 @@ func cgoLookupIPCNAME(name string) (addrs []IP, cname string, err error, complet
continue
}
switch r.Ai_family {
- default:
- continue
case syscall.AF_INET:
sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.Ai_addr))
- addrs = append(addrs, copyIP(sa.Addr[:]))
+ addr := IPAddr{IP: copyIP(sa.Addr[:])}
+ addrs = append(addrs, addr)
case syscall.AF_INET6:
sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.Ai_addr))
- addrs = append(addrs, copyIP(sa.Addr[:]))
+ addr := IPAddr{IP: copyIP(sa.Addr[:]), Zone: zoneToString(int(sa.Scope_id))}
+ addrs = append(addrs, addr)
}
}
return addrs, cname, nil, true
}
-func cgoLookupIP(name string) (addrs []IP, err error, completed bool) {
+func cgoLookupIP(name string) (addrs []IPAddr, err error, completed bool) {
addrs, _, err, completed = cgoLookupIPCNAME(name)
return
}
@@ -177,6 +194,77 @@ func cgoLookupCNAME(name string) (cname string, err error, completed bool) {
return
}
+// These are roughly enough for the following:
+//
+// Source Encoding Maximum length of single name entry
+// Unicast DNS ASCII or <=253 + a NUL terminator
+// Unicode in RFC 5892 252 * total number of labels + delimiters + a NUL terminator
+// Multicast DNS UTF-8 in RFC 5198 or <=253 + a NUL terminator
+// the same as unicast DNS ASCII <=253 + a NUL terminator
+// Local database various depends on implementation
+const (
+ nameinfoLen = 64
+ maxNameinfoLen = 4096
+)
+
+func cgoLookupPTR(addr string) ([]string, error, bool) {
+ acquireThread()
+ defer releaseThread()
+
+ ip := ParseIP(addr)
+ if ip == nil {
+ return nil, &DNSError{Err: "invalid address", Name: addr}, true
+ }
+ sa, salen := cgoSockaddr(ip)
+ if sa == nil {
+ return nil, &DNSError{Err: "invalid address " + ip.String(), Name: addr}, true
+ }
+ var err error
+ var b []byte
+ var gerrno int
+ for l := nameinfoLen; l <= maxNameinfoLen; l *= 2 {
+ b = make([]byte, l)
+ gerrno, err = cgoNameinfoPTR(b, sa, salen)
+ if gerrno == 0 || gerrno != syscall.EAI_OVERFLOW {
+ break
+ }
+ }
+ if gerrno != 0 {
+ switch gerrno {
+ case syscall.EAI_SYSTEM:
+ if err == nil { // see golang.org/issue/6232
+ err = syscall.EMFILE
+ }
+ default:
+ err = addrinfoErrno(gerrno)
+ }
+ return nil, &DNSError{Err: err.Error(), Name: addr}, true
+ }
+
+ for i := 0; i < len(b); i++ {
+ if b[i] == 0 {
+ b = b[:i]
+ break
+ }
+ }
+ // Add trailing dot to match pure Go reverse resolver
+ // and all other lookup routines. See golang.org/issue/12189.
+ if len(b) > 0 && b[len(b)-1] != '.' {
+ b = append(b, '.')
+ }
+ return []string{string(b)}, nil, true
+}
+
+func cgoSockaddr(ip IP) (*syscall.RawSockaddr, syscall.Socklen_t) {
+ if ip4 := ip.To4(); ip4 != nil {
+ return cgoSockaddrInet4(ip4), syscall.Socklen_t(syscall.SizeofSockaddrInet4)
+ }
+ if ip6 := ip.To16(); ip6 != nil {
+ return cgoSockaddrInet6(ip6), syscall.Socklen_t(syscall.SizeofSockaddrInet6)
+ }
+ return nil, 0
+}
+
func copyIP(x IP) IP {
if len(x) < 16 {
return x.To16()
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-04 15:27:21 +0000