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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: connect.cc,v 1.6 2000/05/28 04:34:44 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];
char Service[NI_MAXSERV];
Name[0] = 0;
Service[0] = 0;
getnameinfo(Addr->ai_addr,Addr->ai_addrlen,
Name,sizeof(Name),Service,sizeof(Service),
NI_NUMERICHOST|NI_NUMERICSERV);
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 (%s).",Host.c_str(),Service,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 (%s), "
"connection timed out",Host.c_str(),Service,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)
{
errno = Err;
return _error->Errno("connect","Could not connect to %s:%s (%s).",Host.c_str(),
Service,Name);
}
return true;
}
/*}}}*/
// Connect - Connect to a server /*{{{*/
// ---------------------------------------------------------------------
/* Performs a connection to the server */
bool Connect(string Host,int Port,const char *Service,int DefPort,int &Fd,
unsigned long TimeOut,pkgAcqMethod *Owner)
{
if (_error->PendingError() == true)
return false;
// Convert the port name/number
char ServStr[300];
if (Port != 0)
snprintf(ServStr,sizeof(ServStr),"%u",Port);
else
snprintf(ServStr,sizeof(ServStr),"%s",Service);
/* 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());
// Free the old address structure
if (LastHostAddr != 0)
{
freeaddrinfo(LastHostAddr);
LastHostAddr = 0;
LastUsed = 0;
}
// We only understand SOCK_STREAM sockets.
struct addrinfo Hints;
memset(&Hints,0,sizeof(Hints));
Hints.ai_socktype = SOCK_STREAM;
Hints.ai_protocol = 0;
// Resolve both the host and service simultaneously
while (1)
{
int Res;
if ((Res = getaddrinfo(Host.c_str(),ServStr,&Hints,&LastHostAddr)) != 0 ||
LastHostAddr == 0)
{
if (Res == EAI_NONAME || Res == EAI_SERVICE)
{
if (DefPort != 0)
{
snprintf(ServStr,sizeof(ServStr),"%u",DefPort);
DefPort = 0;
continue;
}
return _error->Error("Could not resolve '%s'",Host.c_str());
}
return _error->Error("Something wicked happend resolving '%s:%s'",
Host.c_str(),ServStr);
}
break;
}
LastHost = Host;
LastPort = Port;
}
// When we have an IP rotation stay with the last IP.
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;
// Ignore UNIX domain sockets
do
{
CurHost = CurHost->ai_next;
}
while (CurHost != 0 && CurHost->ai_family == AF_UNIX);
LastUsed = 0;
if (CurHost != 0)
_error->Discard();
}
if (_error->PendingError() == true)
return false;
return _error->Error("Unable to connect to %s:",Host.c_str(),ServStr);
}
/*}}}*/
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