Multiprotocol connect

Author: jgg
Date: 1999-05-29 03:25:03 GMT
Multiprotocol connect

1 files changed, 143 insertions, 0 deletions

diff --git a/methods/connect.cc b/methods/connect.cc
new file mode 100644
index 000000000..a7ef8c669
--- /dev/null
+++ b/methods/connect.cc
@@ -0,0 +1,143 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+// $Id: connect.cc,v 1.1 1999/05/29 03:25:03 jgg Exp $
+/* ######################################################################
+
+   Connect - Replacement connect call
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include "connect.h"
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
+
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+// Internet stuff
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include "rfc2553emu.h"
+									/*}}}*/
+
+static string LastHost;
+static int LastPort = 0;
+static struct addrinfo *LastHostAddr = 0;
+static struct addrinfo *LastUsed = 0;
+
+// DoConnect - Attempt a connect operation				/*{{{*/
+// ---------------------------------------------------------------------
+/* This helper function attempts a connection to a single address. */
+static bool DoConnect(struct addrinfo *Addr,string Host,
+		      unsigned long TimeOut,int &Fd,pkgAcqMethod *Owner)
+{
+   // Show a status indicator
+   char Name[NI_MAXHOST];
+   Name[0] = 0;
+   getnameinfo(Addr->ai_addr,Addr->ai_addrlen,
+	       Name,sizeof(Name),0,0,NI_NUMERICHOST);
+   Owner->Status("Connecting to %s (%s)",Host.c_str(),Name);
+   
+   // Get a socket
+   if ((Fd = socket(Addr->ai_family,Addr->ai_socktype,
+		    Addr->ai_protocol)) < 0)
+      return _error->Errno("socket","Could not create a socket");
+   
+   SetNonBlock(Fd,true);
+   if (connect(Fd,Addr->ai_addr,Addr->ai_addrlen) < 0 &&
+       errno != EINPROGRESS)
+      return _error->Errno("connect","Cannot initiate the connection "
+			   "to %s (%s).",Host.c_str(),Name);
+   
+   /* This implements a timeout for connect by opening the connection
+      nonblocking */
+   if (WaitFd(Fd,true,TimeOut) == false)
+      return _error->Error("Could not connect to %s (%s), "
+			   "connection timed out",Host.c_str(),Name);
+   
+   // Check the socket for an error condition
+   unsigned int Err;
+   unsigned int Len = sizeof(Err);
+   if (getsockopt(Fd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0)
+      return _error->Errno("getsockopt","Failed");
+   
+   if (Err != 0)
+      return _error->Error("Could not connect to %s (%s).",Host.c_str(),Name);
+
+   return true;
+}
+									/*}}}*/
+// Connect - Connect to a server						/*{{{*/
+// ---------------------------------------------------------------------
+/* Performs a connection to the server */
+bool Connect(string Host,int Port,const char *Service,int &Fd,
+	     unsigned long TimeOut,pkgAcqMethod *Owner)
+{
+   if (_error->PendingError() == true)
+      return false;
+   
+   /* We used a cached address record.. Yes this is against the spec but
+      the way we have setup our rotating dns suggests that this is more
+      sensible */
+   if (LastHost != Host || LastPort != Port)
+   {
+      Owner->Status("Connecting to %s",Host.c_str());
+
+      // Lookup the host
+      char S[300];
+      if (Port != 0)
+	 snprintf(S,sizeof(S),"%u",Port);
+      else
+	 snprintf(S,sizeof(S),"%s",Service);
+
+      // Free the old address structure
+      if (LastHostAddr != 0)
+      {
+	 freeaddrinfo(LastHostAddr);
+	 LastHostAddr = 0;
+      }
+      
+      // We only understand SOCK_STREAM sockets.
+      struct addrinfo Hints;
+      memset(&Hints,0,sizeof(Hints));
+      Hints.ai_socktype = SOCK_STREAM;
+      
+      // Resolve both the host and service simultaneously
+      if (getaddrinfo(Host.c_str(),S,&Hints,&LastHostAddr) != 0 ||
+	  LastHostAddr == 0)
+	 return _error->Error("Could not resolve '%s'",Host.c_str());
+
+      LastHost = Host;
+      LastPort = Port;
+      LastUsed = 0;
+   }
+
+   // Get the printable IP address
+   struct addrinfo *CurHost = LastHostAddr;
+   if (LastUsed != 0)
+       CurHost = LastUsed;
+   
+   while (CurHost != 0)
+   {
+      if (DoConnect(CurHost,Host,TimeOut,Fd,Owner) == true)
+      {
+	 LastUsed = CurHost;
+	 return true;
+      }      
+      close(Fd);
+      Fd = -1;
+      
+      CurHost = CurHost->ai_next;
+      LastUsed = 0;
+      if (CurHost != 0)
+	 _error->Discard();
+   }
+   
+   return false;
+}
+									/*}}}*/