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* net/interfaces: fix android "route ip+net: netlinkrib: permission d…
…enied" Signed-off-by: Asutorufa <16442314+Asutorufa@users.noreply.github.com>
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BSD 3-Clause License | ||
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Copyright (c) 2023, wlynxg | ||
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Redistribution and use in source and binary forms, with or without | ||
modification, are permitted provided that the following conditions are met: | ||
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1. Redistributions of source code must retain the above copyright notice, this | ||
list of conditions and the following disclaimer. | ||
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2. Redistributions in binary form must reproduce the above copyright notice, | ||
this list of conditions and the following disclaimer in the documentation | ||
and/or other materials provided with the distribution. | ||
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3. Neither the name of the copyright holder nor the names of its | ||
contributors may be used to endorse or promote products derived from | ||
this software without specific prior written permission. | ||
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | ||
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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//go:build androidxx | ||
// +build androidxx | ||
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package anet | ||
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import ( | ||
"net" | ||
) | ||
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// Interfaces returns a list of the system's network interfaces. | ||
func Interfaces() ([]net.Interface, error) { | ||
return net.Interfaces() | ||
} | ||
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// InterfaceAddrs returns a list of the system's unicast interface | ||
// addresses. | ||
// | ||
// The returned list does not identify the associated interface; use | ||
// Interfaces and Interface.Addrs for more detail. | ||
func InterfaceAddrs() ([]net.Addr, error) { | ||
return net.InterfaceAddrs() | ||
} | ||
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func InterfaceAddrTable(i *net.Interface) ([]net.Addr, error) { | ||
return i.Addrs() | ||
} |
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// 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. | ||
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// Netlink sockets and messages | ||
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package anet | ||
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import ( | ||
"syscall" | ||
"unsafe" | ||
) | ||
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// Round the length of a netlink message up to align it properly. | ||
func nlmAlignOf(msglen int) int { | ||
return (msglen + syscall.NLMSG_ALIGNTO - 1) & ^(syscall.NLMSG_ALIGNTO - 1) | ||
} | ||
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// Round the length of a netlink route attribute up to align it | ||
// properly. | ||
func rtaAlignOf(attrlen int) int { | ||
return (attrlen + syscall.RTA_ALIGNTO - 1) & ^(syscall.RTA_ALIGNTO - 1) | ||
} | ||
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// NetlinkRouteRequest represents a request message to receive routing | ||
// and link states from the kernel. | ||
type NetlinkRouteRequest struct { | ||
Header syscall.NlMsghdr | ||
Data syscall.RtGenmsg | ||
} | ||
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func (rr *NetlinkRouteRequest) toWireFormat() []byte { | ||
b := make([]byte, rr.Header.Len) | ||
*(*uint32)(unsafe.Pointer(&b[0:4][0])) = rr.Header.Len | ||
*(*uint16)(unsafe.Pointer(&b[4:6][0])) = rr.Header.Type | ||
*(*uint16)(unsafe.Pointer(&b[6:8][0])) = rr.Header.Flags | ||
*(*uint32)(unsafe.Pointer(&b[8:12][0])) = rr.Header.Seq | ||
*(*uint32)(unsafe.Pointer(&b[12:16][0])) = rr.Header.Pid | ||
b[16] = byte(rr.Data.Family) | ||
return b | ||
} | ||
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func newNetlinkRouteRequest(proto, seq, family int) []byte { | ||
rr := &NetlinkRouteRequest{} | ||
rr.Header.Len = uint32(syscall.NLMSG_HDRLEN + syscall.SizeofRtGenmsg) | ||
rr.Header.Type = uint16(proto) | ||
rr.Header.Flags = syscall.NLM_F_DUMP | syscall.NLM_F_REQUEST | ||
rr.Header.Seq = uint32(seq) | ||
rr.Data.Family = uint8(family) | ||
return rr.toWireFormat() | ||
} | ||
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// NetlinkRIB returns routing information base, as known as RIB, which | ||
// consists of network facility information, states and parameters. | ||
func NetlinkRIB(proto, family int) ([]byte, error) { | ||
s, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_RAW|syscall.SOCK_CLOEXEC, syscall.NETLINK_ROUTE) | ||
if err != nil { | ||
return nil, err | ||
} | ||
defer syscall.Close(s) | ||
sa := &syscall.SockaddrNetlink{Family: syscall.AF_NETLINK} | ||
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wb := newNetlinkRouteRequest(proto, 1, family) | ||
if err := syscall.Sendto(s, wb, 0, sa); err != nil { | ||
return nil, err | ||
} | ||
lsa, err := syscall.Getsockname(s) | ||
if err != nil { | ||
return nil, err | ||
} | ||
lsanl, ok := lsa.(*syscall.SockaddrNetlink) | ||
if !ok { | ||
return nil, syscall.EINVAL | ||
} | ||
var tab []byte | ||
rbNew := make([]byte, syscall.Getpagesize()) | ||
done: | ||
for { | ||
rb := rbNew | ||
nr, _, err := syscall.Recvfrom(s, rb, 0) | ||
if err != nil { | ||
return nil, err | ||
} | ||
if nr < syscall.NLMSG_HDRLEN { | ||
return nil, syscall.EINVAL | ||
} | ||
rb = rb[:nr] | ||
tab = append(tab, rb...) | ||
msgs, err := ParseNetlinkMessage(rb) | ||
if err != nil { | ||
return nil, err | ||
} | ||
for _, m := range msgs { | ||
if m.Header.Seq != 1 || m.Header.Pid != lsanl.Pid { | ||
return nil, syscall.EINVAL | ||
} | ||
if m.Header.Type == syscall.NLMSG_DONE { | ||
break done | ||
} | ||
if m.Header.Type == syscall.NLMSG_ERROR { | ||
return nil, syscall.EINVAL | ||
} | ||
} | ||
} | ||
return tab, nil | ||
} | ||
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// NetlinkMessage represents a netlink message. | ||
type NetlinkMessage struct { | ||
Header syscall.NlMsghdr | ||
Data []byte | ||
} | ||
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// ParseNetlinkMessage parses b as an array of netlink messages and | ||
// returns the slice containing the NetlinkMessage structures. | ||
func ParseNetlinkMessage(b []byte) ([]NetlinkMessage, error) { | ||
var msgs []NetlinkMessage | ||
for len(b) >= syscall.NLMSG_HDRLEN { | ||
h, dbuf, dlen, err := netlinkMessageHeaderAndData(b) | ||
if err != nil { | ||
return nil, err | ||
} | ||
m := NetlinkMessage{Header: *h, Data: dbuf[:int(h.Len)-syscall.NLMSG_HDRLEN]} | ||
msgs = append(msgs, m) | ||
b = b[dlen:] | ||
} | ||
return msgs, nil | ||
} | ||
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func netlinkMessageHeaderAndData(b []byte) (*syscall.NlMsghdr, []byte, int, error) { | ||
h := (*syscall.NlMsghdr)(unsafe.Pointer(&b[0])) | ||
l := nlmAlignOf(int(h.Len)) | ||
if int(h.Len) < syscall.NLMSG_HDRLEN || l > len(b) { | ||
return nil, nil, 0, syscall.EINVAL | ||
} | ||
return h, b[syscall.NLMSG_HDRLEN:], l, nil | ||
} | ||
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// NetlinkRouteAttr represents a netlink route attribute. | ||
type NetlinkRouteAttr struct { | ||
Attr syscall.RtAttr | ||
Value []byte | ||
} | ||
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// ParseNetlinkRouteAttr parses m's payload as an array of netlink | ||
// route attributes and returns the slice containing the | ||
// NetlinkRouteAttr structures. | ||
func ParseNetlinkRouteAttr(m *NetlinkMessage) ([]NetlinkRouteAttr, error) { | ||
var b []byte | ||
switch m.Header.Type { | ||
case syscall.RTM_NEWLINK, syscall.RTM_DELLINK: | ||
b = m.Data[syscall.SizeofIfInfomsg:] | ||
case syscall.RTM_NEWADDR, syscall.RTM_DELADDR: | ||
b = m.Data[syscall.SizeofIfAddrmsg:] | ||
case syscall.RTM_NEWROUTE, syscall.RTM_DELROUTE: | ||
b = m.Data[syscall.SizeofRtMsg:] | ||
default: | ||
return nil, syscall.EINVAL | ||
} | ||
var attrs []NetlinkRouteAttr | ||
for len(b) >= syscall.SizeofRtAttr { | ||
a, vbuf, alen, err := netlinkRouteAttrAndValue(b) | ||
if err != nil { | ||
return nil, err | ||
} | ||
ra := NetlinkRouteAttr{Attr: *a, Value: vbuf[:int(a.Len)-syscall.SizeofRtAttr]} | ||
attrs = append(attrs, ra) | ||
b = b[alen:] | ||
} | ||
return attrs, nil | ||
} | ||
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func netlinkRouteAttrAndValue(b []byte) (*syscall.RtAttr, []byte, int, error) { | ||
a := (*syscall.RtAttr)(unsafe.Pointer(&b[0])) | ||
if int(a.Len) < syscall.SizeofRtAttr || int(a.Len) > len(b) { | ||
return nil, nil, 0, syscall.EINVAL | ||
} | ||
return a, b[syscall.SizeofRtAttr:], rtaAlignOf(int(a.Len)), nil | ||
} |
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