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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: connect.cc,v 1.10.2.1 2004/01/16 18:58:50 mdz Exp $
/* ######################################################################
Connect - Replacement connect call
This was originally authored by Jason Gunthorpe <jgg@debian.org>
and is placed in the Public Domain, do with it what you will.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include "connect.h"
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sstream>
#include<set>
#include<string>
// Internet stuff
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "rfc2553emu.h"
#include <apti18n.h>
/*}}}*/
static string LastHost;
static int LastPort = 0;
static struct addrinfo *LastHostAddr = 0;
static struct addrinfo *LastUsed = 0;
// Set of IP/hostnames that we timed out before or couldn't resolve
static std::set<string> bad_addr;
// RotateDNS - Select a new server from a DNS rotation /*{{{*/
// ---------------------------------------------------------------------
/* This is called during certain errors in order to recover by selecting a
new server */
void RotateDNS()
{
if (LastUsed != 0 && LastUsed->ai_next != 0)
LastUsed = LastUsed->ai_next;
else
LastUsed = LastHostAddr;
}
/*}}}*/
// 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);
// if that addr did timeout before, we do not try it again
if(bad_addr.find(string(Name)) != bad_addr.end())
return false;
/* If this is an IP rotation store the IP we are using.. If something goes
wrong this will get tacked onto the end of the error message */
if (LastHostAddr->ai_next != 0)
{
std::stringstream ss;
ioprintf(ss, _("[IP: %s %s]"),Name,Service);
Owner->SetIP(ss.str());
}
// 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 for %s (f=%u t=%u p=%u)"),
Name,Addr->ai_family,Addr->ai_socktype,Addr->ai_protocol);
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) {
bad_addr.insert(bad_addr.begin(), string(Name));
Owner->SetFailReason("Timeout");
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;
if(errno == ECONNREFUSED)
Owner->SetFailReason("ConnectionRefused");
else if (errno == ETIMEDOUT)
Owner->SetFailReason("ConnectionTimedOut");
bad_addr.insert(bad_addr.begin(), string(Name));
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_flags = AI_ADDRCONFIG;
Hints.ai_protocol = 0;
// if we couldn't resolve the host before, we don't try now
if(bad_addr.find(Host) != bad_addr.end())
return _error->Error(_("Could not resolve '%s'"),Host.c_str());
// 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;
}
bad_addr.insert(bad_addr.begin(), Host);
Owner->SetFailReason("ResolveFailure");
return _error->Error(_("Could not resolve '%s'"),Host.c_str());
}
if (Res == EAI_AGAIN)
{
Owner->SetFailReason("TmpResolveFailure");
return _error->Error(_("Temporary failure resolving '%s'"),
Host.c_str());
}
return _error->Error(_("Something wicked happened resolving '%s:%s' (%i - %s)"),
Host.c_str(),ServStr,Res,gai_strerror(Res));
}
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);
/* If we reached the end of the search list then wrap around to the
start */
if (CurHost == 0 && LastUsed != 0)
CurHost = LastHostAddr;
// Reached the end of the search cycle
if (CurHost == LastUsed)
break;
if (CurHost != 0)
_error->Discard();
}
if (_error->PendingError() == true)
return false;
return _error->Error(_("Unable to connect to %s:%s:"),Host.c_str(),ServStr);
}
/*}}}*/
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