mirror of
https://github.com/classilla/tenfourfox.git
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190 lines
6.8 KiB
C++
190 lines
6.8 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ifaddrs-android-ext.h"
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#include <stdlib.h>
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#include <string.h>
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#include "ScopedFd.h"
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#include "LocalArray.h"
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// Returns a pointer to the first byte in the address data (which is
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// stored in network byte order).
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uint8_t* sockaddrBytes(int family, sockaddr_storage* ss) {
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if (family == AF_INET) {
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sockaddr_in* ss4 = reinterpret_cast<sockaddr_in*>(ss);
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return reinterpret_cast<uint8_t*>(&ss4->sin_addr);
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} else if (family == AF_INET6) {
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sockaddr_in6* ss6 = reinterpret_cast<sockaddr_in6*>(ss);
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return reinterpret_cast<uint8_t*>(&ss6->sin6_addr);
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}
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return NULL;
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}
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// Sadly, we can't keep the interface index for portability with BSD.
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// We'll have to keep the name instead, and re-query the index when
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// we need it later.
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bool ifa_setNameAndFlagsByIndex(ifaddrs *self, int interfaceIndex) {
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// Get the name.
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char buf[IFNAMSIZ];
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char* name = if_indextoname(interfaceIndex, buf);
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if (name == NULL) {
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return false;
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}
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self->ifa_name = new char[strlen(name) + 1];
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strcpy(self->ifa_name, name);
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// Get the flags.
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ScopedFd fd(socket(AF_INET, SOCK_DGRAM, 0));
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if (fd.get() == -1) {
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return false;
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}
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ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strcpy(ifr.ifr_name, name);
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int rc = ioctl(fd.get(), SIOCGIFFLAGS, &ifr);
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if (rc == -1) {
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return false;
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}
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self->ifa_flags = ifr.ifr_flags;
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return true;
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}
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// Netlink gives us the address family in the header, and the
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// sockaddr_in or sockaddr_in6 bytes as the payload. We need to
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// stitch the two bits together into the sockaddr that's part of
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// our portable interface.
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void ifa_setAddress(ifaddrs *self, int family, void* data, size_t byteCount) {
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// Set the address proper...
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sockaddr_storage* ss = new sockaddr_storage;
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memset(ss, 0, sizeof(*ss));
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self->ifa_addr = reinterpret_cast<sockaddr*>(ss);
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ss->ss_family = family;
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uint8_t* dst = sockaddrBytes(family, ss);
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memcpy(dst, data, byteCount);
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}
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// Netlink gives us the prefix length as a bit count. We need to turn
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// that into a BSD-compatible netmask represented by a sockaddr*.
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void ifa_setNetmask(ifaddrs *self, int family, size_t prefixLength) {
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// ...and work out the netmask from the prefix length.
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sockaddr_storage* ss = new sockaddr_storage;
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memset(ss, 0, sizeof(*ss));
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self->ifa_netmask = reinterpret_cast<sockaddr*>(ss);
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ss->ss_family = family;
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uint8_t* dst = sockaddrBytes(family, ss);
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memset(dst, 0xff, prefixLength / 8);
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if ((prefixLength % 8) != 0) {
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dst[prefixLength/8] = (0xff << (8 - (prefixLength % 8)));
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}
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}
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// FIXME: use iovec instead.
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struct addrReq_struct {
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nlmsghdr netlinkHeader;
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ifaddrmsg msg;
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};
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inline bool sendNetlinkMessage(int fd, const void* data, size_t byteCount) {
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ssize_t sentByteCount = TEMP_FAILURE_RETRY(send(fd, data, byteCount, 0));
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return (sentByteCount == static_cast<ssize_t>(byteCount));
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}
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inline ssize_t recvNetlinkMessage(int fd, char* buf, size_t byteCount) {
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return TEMP_FAILURE_RETRY(recv(fd, buf, byteCount, 0));
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}
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// Source-compatible with the BSD function.
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int getifaddrs(ifaddrs** result)
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{
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// Simplify cleanup for callers.
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*result = NULL;
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// Create a netlink socket.
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ScopedFd fd(socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE));
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if (fd.get() < 0) {
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return -1;
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}
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// Ask for the address information.
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addrReq_struct addrRequest;
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memset(&addrRequest, 0, sizeof(addrRequest));
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addrRequest.netlinkHeader.nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH;
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addrRequest.netlinkHeader.nlmsg_type = RTM_GETADDR;
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addrRequest.netlinkHeader.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(addrRequest)));
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addrRequest.msg.ifa_family = AF_UNSPEC; // All families.
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addrRequest.msg.ifa_index = 0; // All interfaces.
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if (!sendNetlinkMessage(fd.get(), &addrRequest, addrRequest.netlinkHeader.nlmsg_len)) {
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return -1;
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}
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// Read the responses.
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LocalArray<0> buf(65536); // We don't necessarily have std::vector.
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ssize_t bytesRead;
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while ((bytesRead = recvNetlinkMessage(fd.get(), &buf[0], buf.size())) > 0) {
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nlmsghdr* hdr = reinterpret_cast<nlmsghdr*>(&buf[0]);
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for (; NLMSG_OK(hdr, (size_t)bytesRead); hdr = NLMSG_NEXT(hdr, bytesRead)) {
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switch (hdr->nlmsg_type) {
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case NLMSG_DONE:
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return 0;
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case NLMSG_ERROR:
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return -1;
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case RTM_NEWADDR:
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{
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ifaddrmsg* address = reinterpret_cast<ifaddrmsg*>(NLMSG_DATA(hdr));
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rtattr* rta = IFA_RTA(address);
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size_t ifaPayloadLength = IFA_PAYLOAD(hdr);
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while (RTA_OK(rta, ifaPayloadLength)) {
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if (rta->rta_type == IFA_LOCAL) {
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int family = address->ifa_family;
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if (family == AF_INET || family == AF_INET6) {
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ifaddrs *next = *result;
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*result = new ifaddrs;
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memset(*result, 0, sizeof(ifaddrs));
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(*result)->ifa_next = next;
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if (!ifa_setNameAndFlagsByIndex(*result, address->ifa_index)) {
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return -1;
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}
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ifa_setAddress(*result, family, RTA_DATA(rta), RTA_PAYLOAD(rta));
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ifa_setNetmask(*result, family, address->ifa_prefixlen);
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}
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}
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rta = RTA_NEXT(rta, ifaPayloadLength);
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}
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}
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break;
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}
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}
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}
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// We only get here if recv fails before we see a NLMSG_DONE.
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return -1;
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}
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// Source-compatible with the BSD function.
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void freeifaddrs(ifaddrs* addresses) {
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ifaddrs* self = addresses;
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while (self != NULL) {
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delete[] self->ifa_name;
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delete self->ifa_addr;
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delete self->ifa_netmask;
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ifaddrs* next = self->ifa_next;
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delete self;
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self = next;
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}
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}
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