[apt.git] / methods / connect.cc

// -*- 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 <config.h>

#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/srvrec.h>

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sstream>
#include <string.h>
#include<set>
#include<string>

// Internet stuff
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>

#include "connect.h"
#include "rfc2553emu.h"
#include <apti18n.h>
									/*}}}*/

static std::string LastHost;
static int LastPort = 0;
static struct addrinfo *LastHostAddr = 0;
static struct addrinfo *LastUsed = 0;

static std::vector<SrvRec> SrvRecords;

// Set of IP/hostnames that we timed out before or couldn't resolve
static std::set<std::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,std::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(std::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(), std::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(), std::string(Name));
      return _error->Errno("connect",_("Could not connect to %s:%s (%s)."),Host.c_str(),
			   Service,Name);
   }
   
   return true;
}
									/*}}}*/
// Connect to a given Hostname						/*{{{*/
static bool ConnectToHostname(std::string const &Host, int const Port,
      const char * const Service, int DefPort, int &Fd,
      unsigned long const TimeOut, pkgAcqMethod * const Owner)
{
   // Convert the port name/number
   char ServStr[300];
   if (Port != 0)
      snprintf(ServStr,sizeof(ServStr),"%i", 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(_config->FindB("Acquire::ForceIPv4", false) == true)
         Hints.ai_family = AF_INET;
      else if(_config->FindB("Acquire::ForceIPv6", false) == true)
         Hints.ai_family = AF_INET6;
      else
         Hints.ai_family = AF_UNSPEC;

      // 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), "%i", 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());
	    }
	    if (Res == EAI_SYSTEM)
	       return _error->Errno("getaddrinfo", _("System error resolving '%s:%s'"),
                                      Host.c_str(),ServStr);
	    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);
}
									/*}}}*/
// Connect - Connect to a server					/*{{{*/
// ---------------------------------------------------------------------
/* Performs a connection to the server (including SRV record lookup) */
bool Connect(std::string Host,int Port,const char *Service,
                            int DefPort,int &Fd,
                            unsigned long TimeOut,pkgAcqMethod *Owner)
{
   if (_error->PendingError() == true)
      return false;

   if(LastHost != Host || LastPort != Port)
   {
      SrvRecords.clear();
      if (_config->FindB("Acquire::EnableSrvRecords", true) == true)
         GetSrvRecords(Host, DefPort, SrvRecords);
   }
   // we have no SrvRecords for this host, connect right away
   if(SrvRecords.size() == 0)
      return ConnectToHostname(Host, Port, Service, DefPort, Fd, 
                                    TimeOut, Owner);

   // try to connect in the priority order of the srv records
   while(SrvRecords.size() > 0)
   {
      Host = PopFromSrvRecs(SrvRecords).target;
      if(ConnectToHostname(Host, Port, Service, DefPort, Fd, TimeOut, Owner))
         return true;

      // we couldn't connect to this one, use the next
      SrvRecords.erase(SrvRecords.begin());
   }

   return false;
}
Commit	Line	Data
0837bd25 AL	1	// -- mode: cpp; mode: fold --
0837bd25 AL	2	// Description /{{{/
7db98ffc	3	// $Id: connect.cc,v 1.10.2.1 2004/01/16 18:58:50 mdz Exp $
0837bd25 AL	4	/* ######################################################################
	5
	6	Connect - Replacement connect call
7da2b375 AL	7
	8	This was originally authored by Jason Gunthorpe <jgg@debian.org>
	9	and is placed in the Public Domain, do with it what you will.
	10
0837bd25 AL	11	##################################################################### */
	12	/}}}/
	13	// Include Files /{{{/
ea542140 DK	14	#include <config.h>
ea542140 DK	15
0837bd25 AL	16	#include <apt-pkg/error.h>
0837bd25 AL	17	#include <apt-pkg/fileutl.h>
472ff00e DK	18	#include <apt-pkg/strutl.h>
472ff00e DK	19	#include <apt-pkg/acquire-method.h>
45d02095	20	#include <apt-pkg/configuration.h>
a01695e8	21	#include <apt-pkg/srvrec.h>
0837bd25 AL	22
	23	#include <stdio.h>
	24	#include <errno.h>
	25	#include <unistd.h>
36280399	26	#include <sstream>
453b82a3	27	#include <string.h>
654881fb MV	28	#include<set>
	29	#include<string>
	30
0837bd25 AL	31	// Internet stuff
	32	#include <netinet/in.h>
	33	#include <sys/socket.h>
	34	#include <arpa/inet.h>
	35	#include <netdb.h>
	36
ea542140	37	#include "connect.h"
0837bd25	38	#include "rfc2553emu.h"
d77559ac	39	#include <apti18n.h>
0837bd25 AL	40	/}}}/
0837bd25 AL	41
8f3ba4e8	42	static std::string LastHost;
0837bd25 AL	43	static int LastPort = 0;
	44	static struct addrinfo *LastHostAddr = 0;
	45	static struct addrinfo *LastUsed = 0;
	46
a01695e8	47	static std::vector<SrvRec> SrvRecords;
a01695e8	48
654881fb	49	// Set of IP/hostnames that we timed out before or couldn't resolve
8f3ba4e8	50	static std::set<std::string> bad_addr;
654881fb	51
b2e465d6 AL	52	// RotateDNS - Select a new server from a DNS rotation /{{{/
	53	// ---------------------------------------------------------------------
	54	/* This is called during certain errors in order to recover by selecting a
	55	new server */
	56	void RotateDNS()
	57	{
	58	if (LastUsed != 0 && LastUsed->ai_next != 0)
	59	LastUsed = LastUsed->ai_next;
	60	else
	61	LastUsed = LastHostAddr;
	62	}
	63	/}}}/
0837bd25 AL	64	// DoConnect - Attempt a connect operation /{{{/
	65	// ---------------------------------------------------------------------
	66	/* This helper function attempts a connection to a single address. */
8f3ba4e8	67	static bool DoConnect(struct addrinfo *Addr,std::string Host,
0837bd25 AL	68	unsigned long TimeOut,int &Fd,pkgAcqMethod *Owner)
	69	{
	70	// Show a status indicator
	71	char Name[NI_MAXHOST];
28006885	72	char Service[NI_MAXSERV];
b2e465d6 AL	73
b2e465d6 AL	74	Name[0] = 0;
28006885	75	Service[0] = 0;
0837bd25	76	getnameinfo(Addr->ai_addr,Addr->ai_addrlen,
28006885 AL	77	Name,sizeof(Name),Service,sizeof(Service),
28006885 AL	78	NI_NUMERICHOST\|NI_NUMERICSERV);
dc738e7a	79	Owner->Status(_("Connecting to %s (%s)"),Host.c_str(),Name);
b2e465d6	80
654881fb	81	// if that addr did timeout before, we do not try it again
8f3ba4e8	82	if(bad_addr.find(std::string(Name)) != bad_addr.end())
654881fb MV	83	return false;
654881fb MV	84
b2e465d6 AL	85	/* If this is an IP rotation store the IP we are using.. If something goes
	86	wrong this will get tacked onto the end of the error message */
	87	if (LastHostAddr->ai_next != 0)
	88	{
36280399 MV	89	std::stringstream ss;
	90	ioprintf(ss, _("[IP: %s %s]"),Name,Service);
	91	Owner->SetIP(ss.str());
	92	}
b2e465d6	93
0837bd25 AL	94	// Get a socket
	95	if ((Fd = socket(Addr->ai_family,Addr->ai_socktype,
	96	Addr->ai_protocol)) < 0)
dc738e7a	97	return _error->Errno("socket",_("Could not create a socket for %s (f=%u t=%u p=%u)"),
b2e465d6	98	Name,Addr->ai_family,Addr->ai_socktype,Addr->ai_protocol);
0837bd25 AL	99
	100	SetNonBlock(Fd,true);
	101	if (connect(Fd,Addr->ai_addr,Addr->ai_addrlen) < 0 &&
	102	errno != EINPROGRESS)
dc738e7a AL	103	return _error->Errno("connect",_("Cannot initiate the connection "
dc738e7a AL	104	"to %s:%s (%s)."),Host.c_str(),Service,Name);
0837bd25 AL	105
	106	/* This implements a timeout for connect by opening the connection
	107	nonblocking */
24057ad6	108	if (WaitFd(Fd,true,TimeOut) == false) {
8f3ba4e8	109	bad_addr.insert(bad_addr.begin(), std::string(Name));
36280399	110	Owner->SetFailReason("Timeout");
dc738e7a AL	111	return _error->Error(_("Could not connect to %s:%s (%s), "
dc738e7a AL	112	"connection timed out"),Host.c_str(),Service,Name);
24057ad6	113	}
b2e465d6	114
0837bd25 AL	115	// Check the socket for an error condition
	116	unsigned int Err;
	117	unsigned int Len = sizeof(Err);
	118	if (getsockopt(Fd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0)
dc738e7a	119	return _error->Errno("getsockopt",_("Failed"));
0837bd25 AL	120
0837bd25 AL	121	if (Err != 0)
28006885 AL	122	{
28006885 AL	123	errno = Err;
75dd8af1	124	if(errno == ECONNREFUSED)
36280399	125	Owner->SetFailReason("ConnectionRefused");
785b920b	126	else if (errno == ETIMEDOUT)
df3226c1	127	Owner->SetFailReason("ConnectionTimedOut");
8f3ba4e8	128	bad_addr.insert(bad_addr.begin(), std::string(Name));
dc738e7a	129	return _error->Errno("connect",_("Could not connect to %s:%s (%s)."),Host.c_str(),
28006885 AL	130	Service,Name);
	131	}
	132
0837bd25 AL	133	return true;
	134	}
	135	/}}}/
b830f576 DK	136	// Connect to a given Hostname /{{{/
	137	static bool ConnectToHostname(std::string const &Host, int const Port,
	138	const char * const Service, int DefPort, int &Fd,
	139	unsigned long const TimeOut, pkgAcqMethod * const Owner)
cc480014	140	{
28006885 AL	141	// Convert the port name/number
	142	char ServStr[300];
	143	if (Port != 0)
9ce3cfc9	144	snprintf(ServStr,sizeof(ServStr),"%i", Port);
28006885	145	else
9ce3cfc9	146	snprintf(ServStr,sizeof(ServStr),"%s", Service);
0837bd25 AL	147
	148	/* We used a cached address record.. Yes this is against the spec but
	149	the way we have setup our rotating dns suggests that this is more
	150	sensible */
	151	if (LastHost != Host \|\| LastPort != Port)
	152	{
dc738e7a	153	Owner->Status(_("Connecting to %s"),Host.c_str());
0837bd25	154
0837bd25 AL	155	// Free the old address structure
	156	if (LastHostAddr != 0)
	157	{
	158	freeaddrinfo(LastHostAddr);
	159	LastHostAddr = 0;
28006885	160	LastUsed = 0;
0837bd25 AL	161	}
	162
	163	// We only understand SOCK_STREAM sockets.
	164	struct addrinfo Hints;
	165	memset(&Hints,0,sizeof(Hints));
	166	Hints.ai_socktype = SOCK_STREAM;
d746ad6e	167	Hints.ai_flags = AI_ADDRCONFIG;
28006885	168	Hints.ai_protocol = 0;
0837bd25	169
45d02095 MV	170	if(_config->FindB("Acquire::ForceIPv4", false) == true)
	171	Hints.ai_family = AF_INET;
	172	else if(_config->FindB("Acquire::ForceIPv6", false) == true)
	173	Hints.ai_family = AF_INET6;
	174	else
	175	Hints.ai_family = AF_UNSPEC;
	176
654881fb MV	177	// if we couldn't resolve the host before, we don't try now
	178	if(bad_addr.find(Host) != bad_addr.end())
	179	return _error->Error(_("Could not resolve '%s'"),Host.c_str());
	180
0837bd25	181	// Resolve both the host and service simultaneously
9505213b	182	while (1)
c141b9a9	183	{
9505213b	184	int Res;
28006885	185	if ((Res = getaddrinfo(Host.c_str(),ServStr,&Hints,&LastHostAddr)) != 0 \|\|
9505213b AL	186	LastHostAddr == 0)
9505213b AL	187	{
72472b95	188	if (Res == EAI_NONAME \|\| Res == EAI_SERVICE)
9505213b AL	189	{
	190	if (DefPort != 0)
	191	{
9ce3cfc9	192	snprintf(ServStr, sizeof(ServStr), "%i", DefPort);
9505213b AL	193	DefPort = 0;
	194	continue;
	195	}
654881fb	196	bad_addr.insert(bad_addr.begin(), Host);
59271f62	197	Owner->SetFailReason("ResolveFailure");
dc738e7a	198	return _error->Error(_("Could not resolve '%s'"),Host.c_str());
9505213b AL	199	}
9505213b AL	200
4fe6e0c2	201	if (Res == EAI_AGAIN)
25182152	202	{
36280399	203	Owner->SetFailReason("TmpResolveFailure");
dc738e7a	204	return _error->Error(_("Temporary failure resolving '%s'"),
4fe6e0c2	205	Host.c_str());
25182152	206	}
945d2a8a	207	if (Res == EAI_SYSTEM)
5cf466f4 MV	208	return _error->Errno("getaddrinfo", _("System error resolving '%s:%s'"),
5cf466f4 MV	209	Host.c_str(),ServStr);
ce26dee7 DK	210	return _error->Error(_("Something wicked happened resolving '%s:%s' (%i - %s)"),
ce26dee7 DK	211	Host.c_str(),ServStr,Res,gai_strerror(Res));
9505213b AL	212	}
9505213b AL	213	break;
c141b9a9 AL	214	}
c141b9a9 AL	215
0837bd25 AL	216	LastHost = Host;
0837bd25 AL	217	LastPort = Port;
0837bd25 AL	218	}
0837bd25 AL	219
28006885	220	// When we have an IP rotation stay with the last IP.
0837bd25 AL	221	struct addrinfo *CurHost = LastHostAddr;
	222	if (LastUsed != 0)
	223	CurHost = LastUsed;
	224
	225	while (CurHost != 0)
	226	{
	227	if (DoConnect(CurHost,Host,TimeOut,Fd,Owner) == true)
	228	{
	229	LastUsed = CurHost;
	230	return true;
	231	}
	232	close(Fd);
	233	Fd = -1;
	234
28006885 AL	235	// Ignore UNIX domain sockets
	236	do
	237	{
	238	CurHost = CurHost->ai_next;
	239	}
	240	while (CurHost != 0 && CurHost->ai_family == AF_UNIX);
b2e465d6 AL	241
	242	/* If we reached the end of the search list then wrap around to the
	243	start */
	244	if (CurHost == 0 && LastUsed != 0)
	245	CurHost = LastHostAddr;
	246
	247	// Reached the end of the search cycle
	248	if (CurHost == LastUsed)
	249	break;
	250
0837bd25 AL	251	if (CurHost != 0)
0837bd25 AL	252	_error->Discard();
b2e465d6	253	}
28006885	254
dd1fd92b	255	if (_error->PendingError() == true)
b2e465d6	256	return false;
cdd5a135	257	return _error->Error(_("Unable to connect to %s:%s:"),Host.c_str(),ServStr);
0837bd25 AL	258	}
0837bd25 AL	259	/}}}/
cc480014 MV	260	// Connect - Connect to a server /{{{/
cc480014 MV	261	// ---------------------------------------------------------------------
cdeb54d4	262	/* Performs a connection to the server (including SRV record lookup) */
cc480014 MV	263	bool Connect(std::string Host,int Port,const char *Service,
	264	int DefPort,int &Fd,
	265	unsigned long TimeOut,pkgAcqMethod *Owner)
	266	{
cc480014 MV	267	if (_error->PendingError() == true)
cc480014 MV	268	return false;
cc480014 MV	269
	270	if(LastHost != Host \|\| LastPort != Port)
	271	{
	272	SrvRecords.clear();
c8ec5ab7	273	if (_config->FindB("Acquire::EnableSrvRecords", true) == true)
c29dbdff	274	GetSrvRecords(Host, DefPort, SrvRecords);
cc480014	275	}
cdeb54d4	276	// we have no SrvRecords for this host, connect right away
cc480014	277	if(SrvRecords.size() == 0)
cdeb54d4	278	return ConnectToHostname(Host, Port, Service, DefPort, Fd,
cc480014 MV	279	TimeOut, Owner);
cc480014 MV	280
cdeb54d4	281	// try to connect in the priority order of the srv records
cc480014 MV	282	while(SrvRecords.size() > 0)
cc480014 MV	283	{
c29dbdff	284	Host = PopFromSrvRecs(SrvRecords).target;
cdeb54d4	285	if(ConnectToHostname(Host, Port, Service, DefPort, Fd, TimeOut, Owner))
cc480014 MV	286	return true;
	287
	288	// we couldn't connect to this one, use the next
	289	SrvRecords.erase(SrvRecords.begin());
cdeb54d4 MV	290	}
cdeb54d4 MV	291
cc480014 MV	292	return false;
cc480014 MV	293	}