summaryrefslogtreecommitdiffstats
path: root/netwerk/sctp/src/ifaddrs_android.cpp
diff options
context:
space:
mode:
authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /netwerk/sctp/src/ifaddrs_android.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
downloadUXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip
Add m-esr52 at 52.6.0
Diffstat (limited to 'netwerk/sctp/src/ifaddrs_android.cpp')
-rw-r--r--netwerk/sctp/src/ifaddrs_android.cpp189
1 files changed, 189 insertions, 0 deletions
diff --git a/netwerk/sctp/src/ifaddrs_android.cpp b/netwerk/sctp/src/ifaddrs_android.cpp
new file mode 100644
index 000000000..78eb90a1a
--- /dev/null
+++ b/netwerk/sctp/src/ifaddrs_android.cpp
@@ -0,0 +1,189 @@
+/* -*- 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;
+ }
+}