The Tor Browser: comparison netwerk/sctp/src/ifaddrs

--1:000000000000
+:0fe6aa5ad1d7
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/*
+* Copyright (C) 2009 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+#include "ifaddrs-android-ext.h"
+#include <stdlib.h>
+#include <string.h>
+#include "ScopedFd.h"
+#include "LocalArray.h"
+// Returns a pointer to the first byte in the address data (which is
+// stored in network byte order).
+uint8_t* sockaddrBytes(int family, sockaddr_storage* ss) {
+if (family == AF_INET) {
+sockaddr_in* ss4 = reinterpret_cast<sockaddr_in*>(ss);
+return reinterpret_cast<uint8_t*>(&ss4->sin_addr);
+} else if (family == AF_INET6) {
+sockaddr_in6* ss6 = reinterpret_cast<sockaddr_in6*>(ss);
+return reinterpret_cast<uint8_t*>(&ss6->sin6_addr);
+}
+return NULL;
+}
+// Sadly, we can't keep the interface index for portability with BSD.
+// We'll have to keep the name instead, and re-query the index when
+// we need it later.
+bool ifa_setNameAndFlagsByIndex(ifaddrs *self, int interfaceIndex) {
+// Get the name.
+char buf[IFNAMSIZ];
+char* name = if_indextoname(interfaceIndex, buf);
+if (name == NULL) {
+return false;
+}
+self->ifa_name = new char[strlen(name) + 1];
+strcpy(self->ifa_name, name);
+// Get the flags.
+ScopedFd fd(socket(AF_INET, SOCK_DGRAM, 0));
+if (fd.get() == -1) {
+return false;
+}
+ifreq ifr;
+memset(&ifr, 0, sizeof(ifr));
+strcpy(ifr.ifr_name, name);
+int rc = ioctl(fd.get(), SIOCGIFFLAGS, &ifr);
+if (rc == -1) {
+return false;
+}
+self->ifa_flags = ifr.ifr_flags;
+return true;
+}
+// Netlink gives us the address family in the header, and the
+// sockaddr_in or sockaddr_in6 bytes as the payload. We need to
+// stitch the two bits together into the sockaddr that's part of
+// our portable interface.
+void ifa_setAddress(ifaddrs *self, int family, void* data, size_t byteCount) {
+// Set the address proper...
+sockaddr_storage* ss = new sockaddr_storage;
+memset(ss, 0, sizeof(*ss));
+self->ifa_addr = reinterpret_cast<sockaddr*>(ss);
+ss->ss_family = family;
+uint8_t* dst = sockaddrBytes(family, ss);
+memcpy(dst, data, byteCount);
+}
+// Netlink gives us the prefix length as a bit count. We need to turn
+// that into a BSD-compatible netmask represented by a sockaddr*.
+void ifa_setNetmask(ifaddrs *self, int family, size_t prefixLength) {
+// ...and work out the netmask from the prefix length.
+sockaddr_storage* ss = new sockaddr_storage;
+memset(ss, 0, sizeof(*ss));
+self->ifa_netmask = reinterpret_cast<sockaddr*>(ss);
+ss->ss_family = family;
+uint8_t* dst = sockaddrBytes(family, ss);
+memset(dst, 0xff, prefixLength / 8);
+if ((prefixLength % 8) != 0) {
+dst[prefixLength/8] = (0xff << (8 - (prefixLength % 8)));
+}
+}
+// FIXME: use iovec instead.
+struct addrReq_struct {
+nlmsghdr netlinkHeader;
+ifaddrmsg msg;
+};
+inline bool sendNetlinkMessage(int fd, const void* data, size_t byteCount) {
+ssize_t sentByteCount = TEMP_FAILURE_RETRY(send(fd, data, byteCount, 0));
+return (sentByteCount == static_cast<ssize_t>(byteCount));
+}
+inline ssize_t recvNetlinkMessage(int fd, char* buf, size_t byteCount) {
+return TEMP_FAILURE_RETRY(recv(fd, buf, byteCount, 0));
+}
+// Source-compatible with the BSD function.
+int getifaddrs(ifaddrs** result)
+{
+// Simplify cleanup for callers.
+*result = NULL;
+// Create a netlink socket.
+ScopedFd fd(socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE));
+if (fd.get() < 0) {
+return -1;
+}
+// Ask for the address information.
+addrReq_struct addrRequest;
+memset(&addrRequest, 0, sizeof(addrRequest));
+addrRequest.netlinkHeader.nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH;
+addrRequest.netlinkHeader.nlmsg_type = RTM_GETADDR;
+addrRequest.netlinkHeader.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(addrRequest)));
+addrRequest.msg.ifa_family = AF_UNSPEC; // All families.
+addrRequest.msg.ifa_index = 0; // All interfaces.
+if (!sendNetlinkMessage(fd.get(), &addrRequest, addrRequest.netlinkHeader.nlmsg_len)) {
+return -1;
+}
+// Read the responses.
+LocalArray<0> buf(65536); // We don't necessarily have std::vector.
+ssize_t bytesRead;
+while ((bytesRead  = recvNetlinkMessage(fd.get(), &buf[0], buf.size())) > 0) {
+nlmsghdr* hdr = reinterpret_cast<nlmsghdr*>(&buf[0]);
+for (; NLMSG_OK(hdr, (size_t)bytesRead); hdr = NLMSG_NEXT(hdr, bytesRead)) {
+switch (hdr->nlmsg_type) {
+case NLMSG_DONE:
+return 0;
+case NLMSG_ERROR:
+return -1;
+case RTM_NEWADDR:
+{
+ifaddrmsg* address = reinterpret_cast<ifaddrmsg*>(NLMSG_DATA(hdr));
+rtattr* rta = IFA_RTA(address);
+size_t ifaPayloadLength = IFA_PAYLOAD(hdr);
+while (RTA_OK(rta, ifaPayloadLength)) {
+if (rta->rta_type == IFA_LOCAL) {
+int family = address->ifa_family;
+if (family == AF_INET || family == AF_INET6) {
+ifaddrs *next = *result;
+*result = new ifaddrs;
+memset(*result, 0, sizeof(ifaddrs));
+(*result)->ifa_next = next;
+if (!ifa_setNameAndFlagsByIndex(*result, address->ifa_index)) {
+return -1;
+}
+ifa_setAddress(*result, family, RTA_DATA(rta), RTA_PAYLOAD(rta));
+ifa_setNetmask(*result, family, address->ifa_prefixlen);
+}
+}
+rta = RTA_NEXT(rta, ifaPayloadLength);
+}
+}
+break;
+}
+}
+}
+// We only get here if recv fails before we see a NLMSG_DONE.
+return -1;
+}
+// Source-compatible with the BSD function.
+void freeifaddrs(ifaddrs* addresses) {
+ifaddrs* self = addresses;
+while (self != NULL) {
+delete[] self->ifa_name;
+delete self->ifa_addr;
+delete self->ifa_netmask;
+ifaddrs* next = self->ifa_next;
+delete self;
+self = next;
+}
+}

The Tor Browser / file comparison

comparison: netwerk/sctp/src/ifaddrs_android.cpp

netwerk/sctp/src/ifaddrs_android.cpp