initial commit, 4.5 stable

thirdparty/misc/ifaddrs-android.cc

@@ -0,0 +1,221 @@
+/*
+ * libjingle
+ * Copyright 2012, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  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.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include "ifaddrs-android.h"
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/utsname.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <errno.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+struct netlinkrequest {
+  nlmsghdr header;
+  ifaddrmsg msg;
+};
+namespace {
+const int kMaxReadSize = 4096;
+};
+int set_ifname(struct ifaddrs* ifaddr, int interface) {
+  char buf[IFNAMSIZ] = {0};
+  char* name = if_indextoname(interface, buf);
+  if (name == NULL) {
+    return -1;
+  }
+  ifaddr->ifa_name = new char[strlen(name) + 1];
+  strncpy(ifaddr->ifa_name, name, strlen(name) + 1);
+  return 0;
+}
+int set_flags(struct ifaddrs* ifaddr) {
+  int fd = socket(AF_INET, SOCK_DGRAM, 0);
+  if (fd == -1) {
+    return -1;
+  }
+  ifreq ifr;
+  memset(&ifr, 0, sizeof(ifr));
+  strncpy(ifr.ifr_name, ifaddr->ifa_name, IFNAMSIZ - 1);
+  int rc = ioctl(fd, SIOCGIFFLAGS, &ifr);
+  close(fd);
+  if (rc == -1) {
+    return -1;
+  }
+  ifaddr->ifa_flags = ifr.ifr_flags;
+  return 0;
+}
+int set_addresses(struct ifaddrs* ifaddr, ifaddrmsg* msg, void* data,
+                  size_t len) {
+  if (msg->ifa_family == AF_INET) {
+    sockaddr_in* sa = new sockaddr_in;
+    sa->sin_family = AF_INET;
+    memcpy(&sa->sin_addr, data, len);
+    ifaddr->ifa_addr = reinterpret_cast<sockaddr*>(sa);
+  } else if (msg->ifa_family == AF_INET6) {
+    sockaddr_in6* sa = new sockaddr_in6;
+    sa->sin6_family = AF_INET6;
+    sa->sin6_scope_id = msg->ifa_index;
+    memcpy(&sa->sin6_addr, data, len);
+    ifaddr->ifa_addr = reinterpret_cast<sockaddr*>(sa);
+  } else {
+    return -1;
+  }
+  return 0;
+}
+int make_prefixes(struct ifaddrs* ifaddr, int family, int prefixlen) {
+  char* prefix = NULL;
+  if (family == AF_INET) {
+    sockaddr_in* mask = new sockaddr_in;
+    mask->sin_family = AF_INET;
+    memset(&mask->sin_addr, 0, sizeof(in_addr));
+    ifaddr->ifa_netmask = reinterpret_cast<sockaddr*>(mask);
+    if (prefixlen > 32) {
+      prefixlen = 32;
+    }
+    prefix = reinterpret_cast<char*>(&mask->sin_addr);
+  } else if (family == AF_INET6) {
+    sockaddr_in6* mask = new sockaddr_in6;
+    mask->sin6_family = AF_INET6;
+    memset(&mask->sin6_addr, 0, sizeof(in6_addr));
+    ifaddr->ifa_netmask = reinterpret_cast<sockaddr*>(mask);
+    if (prefixlen > 128) {
+      prefixlen = 128;
+    }
+    prefix = reinterpret_cast<char*>(&mask->sin6_addr);
+  } else {
+    return -1;
+  }
+  for (int i = 0; i < (prefixlen / 8); i++) {
+    *prefix++ = 0xFF;
+  }
+  char remainder = 0xff;
+  remainder <<= (8 - prefixlen % 8);
+  *prefix = remainder;
+  return 0;
+}
+int populate_ifaddrs(struct ifaddrs* ifaddr, ifaddrmsg* msg, void* bytes,
+                     size_t len) {
+  if (set_ifname(ifaddr, msg->ifa_index) != 0) {
+    return -1;
+  }
+  if (set_flags(ifaddr) != 0) {
+    return -1;
+  }
+  if (set_addresses(ifaddr, msg, bytes, len) != 0) {
+    return -1;
+  }
+  if (make_prefixes(ifaddr, msg->ifa_family, msg->ifa_prefixlen) != 0) {
+    return -1;
+  }
+  return 0;
+}
+int getifaddrs(struct ifaddrs** result) {
+  int fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+  if (fd < 0) {
+    return -1;
+  }
+  netlinkrequest ifaddr_request;
+  memset(&ifaddr_request, 0, sizeof(ifaddr_request));
+  ifaddr_request.header.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
+  ifaddr_request.header.nlmsg_type = RTM_GETADDR;
+  ifaddr_request.header.nlmsg_len = NLMSG_LENGTH(sizeof(ifaddrmsg));
+  ssize_t count = send(fd, &ifaddr_request, ifaddr_request.header.nlmsg_len, 0);
+  if (static_cast<size_t>(count) != ifaddr_request.header.nlmsg_len) {
+    close(fd);
+    return -1;
+  }
+  struct ifaddrs* start = NULL;
+  struct ifaddrs* current = NULL;
+  char buf[kMaxReadSize];
+  ssize_t amount_read = recv(fd, &buf, kMaxReadSize, 0);
+  while (amount_read > 0) {
+    nlmsghdr* header = reinterpret_cast<nlmsghdr*>(&buf[0]);
+    size_t header_size = static_cast<size_t>(amount_read);
+    for ( ; NLMSG_OK(header, header_size);
+          header = NLMSG_NEXT(header, header_size)) {
+      switch (header->nlmsg_type) {
+        case NLMSG_DONE:
+          // Success. Return.
+          *result = start;
+          close(fd);
+          return 0;
+        case NLMSG_ERROR:
+          close(fd);
+          freeifaddrs(start);
+          return -1;
+        case RTM_NEWADDR: {
+          ifaddrmsg* address_msg =
+              reinterpret_cast<ifaddrmsg*>(NLMSG_DATA(header));
+          rtattr* rta = IFA_RTA(address_msg);
+          ssize_t payload_len = IFA_PAYLOAD(header);
+          while (RTA_OK(rta, payload_len)) {
+            if (rta->rta_type == IFA_ADDRESS) {
+              int family = address_msg->ifa_family;
+              if (family == AF_INET || family == AF_INET6) {
+                ifaddrs* newest = new ifaddrs;
+                memset(newest, 0, sizeof(ifaddrs));
+                if (current) {
+                  current->ifa_next = newest;
+                } else {
+                  start = newest;
+                }
+                if (populate_ifaddrs(newest, address_msg, RTA_DATA(rta),
+                                     RTA_PAYLOAD(rta)) != 0) {
+                  freeifaddrs(start);
+                  *result = NULL;
+                  return -1;
+                }
+                current = newest;
+              }
+            }
+            rta = RTA_NEXT(rta, payload_len);
+          }
+          break;
+        }
+      }
+    }
+    amount_read = recv(fd, &buf, kMaxReadSize, 0);
+  }
+  close(fd);
+  freeifaddrs(start);
+  return -1;
+}
+void freeifaddrs(struct ifaddrs* addrs) {
+  struct ifaddrs* last = NULL;
+  struct ifaddrs* cursor = addrs;
+  while (cursor) {
+    delete[] cursor->ifa_name;
+    delete cursor->ifa_addr;
+    delete cursor->ifa_netmask;
+    last = cursor;
+    cursor = cursor->ifa_next;
+    delete last;
+  }
+}