Add new InternetAddress class with a static lookup function (including IPv6 results).

runtime/bin/socket_linux.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include <errno.h>  // NOLINT
 #include <stdio.h>  // NOLINT
 #include <stdlib.h>  // NOLINT
 #include <string.h>  // NOLINT
 #include <sys/stat.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 #include <netinet/tcp.h>  // NOLINT
 
 #include "bin/fdutils.h"
 #include "bin/file.h"
 #include "bin/log.h"
 #include "bin/socket.h"
 
+#define SOCKADDR_STORAGE_SET_PORT(addr, port) \
+    if (addr.ss_family == AF_INET) { \
+      reinterpret_cast<struct sockaddr_in*>(&addr)->sin_port = htons(port); \
+    } else { \
+      reinterpret_cast<struct sockaddr_in6*>(&addr)->sin6_port = htons(port); \
+    }
+
+SocketAddress::SocketAddress(struct addrinfo* addrinfo) {
+  ASSERT(INET6_ADDRSTRLEN >= INET_ADDRSTRLEN);
+  sockaddr_in *sockaddr = reinterpret_cast<sockaddr_in *>(addrinfo->ai_addr);
+  const char* result = inet_ntop(addrinfo->ai_family,
+                                 &sockaddr->sin_addr,
+                                 as_string_,
+                                 INET6_ADDRSTRLEN);
+  if (result == NULL) as_string_[0] = 0;
+  memmove(reinterpret_cast<void *>(&addr_),
+          addrinfo->ai_addr,
+          addrinfo->ai_addrlen);
+}
+
 
 bool Socket::Initialize() {
   // Nothing to do on Linux.
   return true;
 }
 
 
-intptr_t Socket::CreateConnect(const char* host, const intptr_t port) {
+intptr_t Socket::CreateConnect(sockaddr_storage addr, const intptr_t port) {
   intptr_t fd;
-  struct hostent server;
-  struct sockaddr_in server_address;
 
-  fd = TEMP_FAILURE_RETRY(socket(AF_INET, SOCK_STREAM, 0));
+  fd = TEMP_FAILURE_RETRY(socket(addr.ss_family, SOCK_STREAM, 0));
   if (fd < 0) {
     Log::PrintErr("Error CreateConnect: %s\n", strerror(errno));
     return -1;
   }
 
   FDUtils::SetCloseOnExec(fd);
   Socket::SetNonBlocking(fd);
 
-  static const size_t kTempBufSize = 1024;
-  char temp_buf[kTempBufSize];
-  struct hostent *unused;
-  int err;
-  if (gethostbyname_r(
-          host, &server, temp_buf, kTempBufSize, &unused, &err) != 0) {
-    TEMP_FAILURE_RETRY(close(fd));
-    Log::PrintErr("Error CreateConnect: %s\n", strerror(errno));
-    return -1;
-  }
-
-  server_address.sin_family = AF_INET;
-  server_address.sin_port = htons(port);
-  bcopy(server.h_addr, &server_address.sin_addr.s_addr, server.h_length);
-  memset(&server_address.sin_zero, 0, sizeof(server_address.sin_zero));
+  SOCKADDR_STORAGE_SET_PORT(addr, port);
   intptr_t result = TEMP_FAILURE_RETRY(
       connect(fd,
-              reinterpret_cast<struct sockaddr *>(&server_address),
-              sizeof(server_address)));
+              reinterpret_cast<struct sockaddr*>(&addr),
+              SocketAddress::GetAddrLength(addr)));
   if (result == 0 || errno == EINPROGRESS) {
     return fd;
   }
+  TEMP_FAILURE_RETRY(close(fd));
   return -1;
 }
 
 
 intptr_t Socket::Available(intptr_t fd) {
   return FDUtils::AvailableBytes(fd);
 }
 
 
 int Socket::Read(intptr_t fd, void* buffer, intptr_t num_bytes) {
@@ skipping 79 matching lines @@
   if (S_ISFIFO(buf.st_mode)) return File::kPipe;
   if (S_ISREG(buf.st_mode)) return File::kFile;
   return File::kOther;
 }
 
 
 intptr_t Socket::GetStdioHandle(int num) {
   return static_cast<intptr_t>(num);
 }
 
-
-const char* Socket::LookupIPv4Address(char* host, OSError** os_error) {
-  // Perform a name lookup for an IPv4 address.
+SocketAddresses* Socket::LookupAddress(const char* host,
+                                       int type,
+                                       OSError** os_error) {
+  // Perform a name lookup for a host name.
   struct addrinfo hints;
   memset(&hints, 0, sizeof(hints));
-  hints.ai_family = AF_INET;
+  hints.ai_family = SocketAddress::FromType(type);
   hints.ai_socktype = SOCK_STREAM;
+  hints.ai_flags = 0;
   hints.ai_protocol = IPPROTO_TCP;
   struct addrinfo* info = NULL;
   int status = getaddrinfo(host, 0, &hints, &info);
   if (status != 0) {
     ASSERT(*os_error == NULL);
     *os_error = new OSError(status,
                             gai_strerror(status),
                             OSError::kGetAddressInfo);
     return NULL;
   }
-  // Convert the address into IPv4 dotted decimal notation.
-  char* buffer = reinterpret_cast<char*>(malloc(INET_ADDRSTRLEN));
-  sockaddr_in *sockaddr = reinterpret_cast<sockaddr_in *>(info->ai_addr);
-  const char* result = inet_ntop(AF_INET,
-                                 reinterpret_cast<void *>(&sockaddr->sin_addr),
-                                 buffer,
-                                 INET_ADDRSTRLEN);
-  if (result == NULL) {
-    free(buffer);
-    return NULL;
+  intptr_t count = 0;
+  for (struct addrinfo* c = info; c != NULL; c = c->ai_next) {
+    if (c->ai_family == AF_INET || c->ai_family == AF_INET6) count++;
   }
-  ASSERT(result == buffer);
-  return buffer;
+  SocketAddresses* addresses = new SocketAddresses(count);
+  intptr_t i = 0;
+  for (struct addrinfo* c = info; c != NULL; c = c->ai_next) {
+    if (c->ai_family == AF_INET || c->ai_family == AF_INET6) {
+      addresses->SetAt(i, new SocketAddress(c));
+      i++;
+    }
+  }
+  freeaddrinfo(info);
+  return addresses;
 }
 
 
-intptr_t ServerSocket::CreateBindListen(const char* host,
+intptr_t ServerSocket::CreateBindListen(sockaddr_storage addr,
                                         intptr_t port,
                                         intptr_t backlog) {
   intptr_t fd;
-  struct sockaddr_in server_address;
 
-  in_addr_t s_addr = inet_addr(host);
-  if (s_addr == INADDR_NONE) {
-    return -5;
-  }
-
-  fd = TEMP_FAILURE_RETRY(socket(AF_INET, SOCK_STREAM, 0));
+  fd = TEMP_FAILURE_RETRY(socket(addr.ss_family, SOCK_STREAM, 0));
   if (fd < 0) return -1;
 
   FDUtils::SetCloseOnExec(fd);
 
   int optval = 1;
   TEMP_FAILURE_RETRY(
       setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)));
 
-  server_address.sin_family = AF_INET;
-  server_address.sin_port = htons(port);
-  server_address.sin_addr.s_addr = s_addr;
-  memset(&server_address.sin_zero, 0, sizeof(server_address.sin_zero));
+  if (addr.ss_family == AF_INET6) {
+    optval = 0;

[Søren Gjesse, 2013/04/22 15:02:08]

Maybe we should consider a way to keep IPV6_ONLY set (optional argument?).

We should probably add it to SocketOption and support it in Socket.setOption.

We should document that it is on by default.

[Anders Johnsen, 2013/04/23 08:03:57]

Yeah, good idea. Will do a follow-up on this. I think on by default is a good
choice.

+    TEMP_FAILURE_RETRY(
+        setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &optval, sizeof(optval)));
+  }
 
+  SOCKADDR_STORAGE_SET_PORT(addr, port);
   if (TEMP_FAILURE_RETRY(
           bind(fd,
-               reinterpret_cast<struct sockaddr *>(&server_address),
-               sizeof(server_address))) < 0) {
+               reinterpret_cast<struct sockaddr*>(&addr),
+               SocketAddress::GetAddrLength(addr))) < 0) {
     TEMP_FAILURE_RETRY(close(fd));
     return -1;
   }
 
   if (TEMP_FAILURE_RETRY(listen(fd, backlog > 0 ? backlog : SOMAXCONN)) != 0) {
     TEMP_FAILURE_RETRY(close(fd));
     return -1;
   }
 
   Socket::SetNonBlocking(fd);
@@ skipping 56 matching lines @@
 bool Socket::SetNoDelay(intptr_t fd, bool enabled) {
   int on = enabled ? 1 : 0;
   return TEMP_FAILURE_RETRY(setsockopt(fd,
                                        SOL_TCP,
                                        TCP_NODELAY,
                                        reinterpret_cast<char *>(&on),
                                        sizeof(on))) == 0;
 }
 
 #endif  // defined(TARGET_OS_LINUX)