Support IPv6 address for FTP via HTTP tunneling.

We use control connection address as data connection address, so we
don't need to store both address and port. We just store port in
PASV/EPSV response and use SocketCore::getPeerInfo() to get peer's
address when needed.

src/FtpNegotiationCommand.cc

@@ -86,11 +86,13 @@ FtpNegotiationCommand::FtpNegotiationCommand
  const SocketHandle& socket,
  Seq seq,
  const std::string& baseWorkingDir):
-  AbstractCommand(cuid, req, fileEntry, requestGroup, e, socket), sequence_(seq),
+  AbstractCommand(cuid, req, fileEntry, requestGroup, e, socket),
+  sequence_(seq),
   ftp_(new FtpConnection(cuid, socket, req,
                         e->getAuthConfigFactory()->createAuthConfig
                         (req, requestGroup->getOption().get()),
-                        getOption().get()))
+                         getOption().get())),
+  pasvPort_(0)
 {
   ftp_->setBaseWorkingDir(baseWorkingDir);
   if(seq == SEQ_RECV_GREETING) {
@@ -606,10 +608,7 @@ bool FtpNegotiationCommand::recvEpsv() {
     return false;
   }
   if(status == 229) {
-    std::pair<std::string, uint16_t> peerInfo;
+    pasvPort_ = port;
-    getSocket()->getPeerInfo(peerInfo);
-    peerInfo.second = port;
-    dataConnAddr_ = peerInfo;
     return preparePasvConnect();
   } else {
     sequence_ = SEQ_SEND_PASV;
@@ -637,27 +636,24 @@ bool FtpNegotiationCommand::recvPasv() {
     throw DL_ABORT_EX2(fmt(EX_BAD_STATUS, status),
                        error_code::FTP_PROTOCOL_ERROR);
   }
-  std::pair<std::string, uint16_t> peerInfo;
+  pasvPort_ = dest.second;;
-  getSocket()->getPeerInfo(peerInfo);
-  peerInfo.second = dest.second;;
-  dataConnAddr_ = peerInfo;
   return preparePasvConnect();
 }
 
 bool FtpNegotiationCommand::preparePasvConnect() {
-  // TODO Should we check to see that dataConnAddr_.first is not in
-  // noProxy list?
   if(isProxyDefined()) {
     sequence_ = SEQ_RESOLVE_PROXY;
     return true;
   } else {
+    std::pair<std::string, uint16_t> dataAddr;
+    getSocket()->getPeerInfo(dataAddr);
     // make a data connection to the server.
     A2_LOG_INFO(fmt(MSG_CONNECTING_TO_SERVER,
                     getCuid(),
-                    dataConnAddr_.first.c_str(),
+                    dataAddr.first.c_str(),
-                    dataConnAddr_.second));
+                    pasvPort_));
     dataSocket_.reset(new SocketCore());
-    dataSocket_->establishConnection(dataConnAddr_.first, dataConnAddr_.second);
+    dataSocket_->establishConnection(dataAddr.first, pasvPort_);
     disableReadCheckSocket();
     setWriteCheckSocket(dataSocket_);
     sequence_ = SEQ_SEND_REST_PASV;
@@ -722,9 +718,14 @@ bool FtpNegotiationCommand::sendTunnelRequest()
     httpRequest->setUserAgent(getOption()->get(PREF_USER_AGENT));
     SharedHandle<Request> req(new Request());
     // Construct fake URI in order to use HttpRequest
-    // TODO Handle IPv6 address; it must be enclosed with [].
+    std::pair<std::string, uint16_t> dataAddr;
-    req->setUri(fmt("ftp://%s:%u",
+    int family = getSocket()->getPeerInfo(dataAddr);
-                    dataConnAddr_.first.c_str(), dataConnAddr_.second));
+    uri::UriStruct us;
+    us.protocol = "ftp";
+    us.host = dataAddr.first;
+    us.port = pasvPort_;
+    us.ipv6LiteralAddress = (family == AF_INET6);
+    req->setUri(uri::construct(us));
     httpRequest->setRequest(req);
     httpRequest->setProxyRequest(createProxyRequest());
     http_->sendProxyRequest(httpRequest);

src/FtpNegotiationCommand.h

@@ -147,8 +147,8 @@ private:
   SharedHandle<FtpConnection> ftp_;
   // For tunneling
   SharedHandle<HttpConnection> http_;
-  // IP, Port pair in pasv response
+  // Port number in PASV/EPSV response
-  std::pair<std::string, uint16_t> dataConnAddr_;
+  uint16_t pasvPort_;
   // Resolved address for proxy
   std::string proxyAddr_;
 

src/SocketCore.cc

@@ -345,12 +345,13 @@ SocketCore* SocketCore::acceptConnection() const
   return new SocketCore(fd, sockType_);
 }
 
-void SocketCore::getAddrInfo(std::pair<std::string, uint16_t>& addrinfo) const
+int SocketCore::getAddrInfo(std::pair<std::string, uint16_t>& addrinfo) const
 {
   sockaddr_union sockaddr;
   socklen_t len = sizeof(sockaddr);
   getAddrInfo(sockaddr, len);
   addrinfo = util::getNumericNameInfo(&sockaddr.sa, len);
+  return sockaddr.storage.ss_family;
 }
 
 void SocketCore::getAddrInfo(sockaddr_union& sockaddr, socklen_t& len) const
@@ -369,7 +370,7 @@ int SocketCore::getAddressFamily() const
   return sockaddr.storage.ss_family;
 }
 
-void SocketCore::getPeerInfo(std::pair<std::string, uint16_t>& peerinfo) const
+int SocketCore::getPeerInfo(std::pair<std::string, uint16_t>& peerinfo) const
 {
   sockaddr_union sockaddr;
   socklen_t len = sizeof(sockaddr);
@@ -378,6 +379,7 @@ void SocketCore::getPeerInfo(std::pair<std::string, uint16_t>& peerinfo) const
     throw DL_ABORT_EX(fmt(EX_SOCKET_GET_NAME, errorMsg(errNum).c_str()));
   }
   peerinfo = util::getNumericNameInfo(&sockaddr.sa, len);
+  return sockaddr.storage.ss_family;
 }
 
 void SocketCore::establishConnection(const std::string& host, uint16_t port)

src/SocketCore.h

@@ -147,10 +147,12 @@ public:
   void beginListen();
 
   /**
-   * Stores host address and port of this socket to addrinfo.
+   * Stores host address and port of this socket to addrinfo and
+   * returns address family.
+   *
    * @param addrinfo placeholder to store host address and port.
    */
-  void getAddrInfo(std::pair<std::string, uint16_t>& addrinfo) const;
+  int getAddrInfo(std::pair<std::string, uint16_t>& addrinfo) const;
 
   /**
    * Stores address of this socket to sockaddr.  len must be
@@ -168,10 +170,12 @@ public:
   int getAddressFamily() const;
 
   /**
-   * Stores peer's address and port to peerinfo.
+   * Stores peer's address and port to peerinfo and returns address
+   * family.
+   *
    * @param peerinfo placeholder to store peer's address and port.
    */
-  void getPeerInfo(std::pair<std::string, uint16_t>& peerinfo) const;
+  int getPeerInfo(std::pair<std::string, uint16_t>& peerinfo) const;
 
   /**
    * Accepts incoming connection on this socket.