[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;
static int LastSrvRecord = 0;

// 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 
bool ConnectAfterSrvRecords(std::string Host,int Port,const char *Service,
                            int DefPort,int &Fd,
                            unsigned long TimeOut,pkgAcqMethod *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 */
bool Connect(std::string Host,int Port,const char *Service,
                            int DefPort,int &Fd,
                            unsigned long TimeOut,pkgAcqMethod *Owner)
{
#if 0
   if (_error->PendingError() == true)
      return false;
#endif

   if(LastHost != Host || LastPort != Port)
   {
      SrvRecords.clear();
      bool res = GetSrvRecords(Host, DefPort, SrvRecords);
   }
   if(SrvRecords.size() == 0)
      return ConnectAfterSrvRecords(Host, Port, Service, DefPort, Fd, 
                                    TimeOut, Owner);

   bool connected = false;
   while(SrvRecords.size() > 0)
   {
      Host = SrvRecords[0].target;
      connected = ConnectAfterSrvRecords(Host, Port, Service, DefPort, Fd, 
                                         TimeOut, Owner);
      if(connected == true)
         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 MV	47	static std::vector<SrvRec> SrvRecords;
	48	static int LastSrvRecord = 0;
	49
654881fb	50	// Set of IP/hostnames that we timed out before or couldn't resolve
8f3ba4e8	51	static std::set<std::string> bad_addr;
654881fb	52
b2e465d6 AL	53	// RotateDNS - Select a new server from a DNS rotation /{{{/
	54	// ---------------------------------------------------------------------
	55	/* This is called during certain errors in order to recover by selecting a
	56	new server */
	57	void RotateDNS()
	58	{
	59	if (LastUsed != 0 && LastUsed->ai_next != 0)
	60	LastUsed = LastUsed->ai_next;
	61	else
	62	LastUsed = LastHostAddr;
	63	}
	64	/}}}/
0837bd25 AL	65	// DoConnect - Attempt a connect operation /{{{/
	66	// ---------------------------------------------------------------------
	67	/* This helper function attempts a connection to a single address. */
8f3ba4e8	68	static bool DoConnect(struct addrinfo *Addr,std::string Host,
0837bd25 AL	69	unsigned long TimeOut,int &Fd,pkgAcqMethod *Owner)
	70	{
	71	// Show a status indicator
	72	char Name[NI_MAXHOST];
28006885	73	char Service[NI_MAXSERV];
b2e465d6 AL	74
b2e465d6 AL	75	Name[0] = 0;
28006885	76	Service[0] = 0;
0837bd25	77	getnameinfo(Addr->ai_addr,Addr->ai_addrlen,
28006885 AL	78	Name,sizeof(Name),Service,sizeof(Service),
28006885 AL	79	NI_NUMERICHOST\|NI_NUMERICSERV);
dc738e7a	80	Owner->Status(_("Connecting to %s (%s)"),Host.c_str(),Name);
b2e465d6	81
654881fb	82	// if that addr did timeout before, we do not try it again
8f3ba4e8	83	if(bad_addr.find(std::string(Name)) != bad_addr.end())
654881fb MV	84	return false;
654881fb MV	85
b2e465d6 AL	86	/* If this is an IP rotation store the IP we are using.. If something goes
	87	wrong this will get tacked onto the end of the error message */
	88	if (LastHostAddr->ai_next != 0)
	89	{
36280399 MV	90	std::stringstream ss;
	91	ioprintf(ss, _("[IP: %s %s]"),Name,Service);
	92	Owner->SetIP(ss.str());
	93	}
b2e465d6	94
0837bd25 AL	95	// Get a socket
	96	if ((Fd = socket(Addr->ai_family,Addr->ai_socktype,
	97	Addr->ai_protocol)) < 0)
dc738e7a	98	return _error->Errno("socket",_("Could not create a socket for %s (f=%u t=%u p=%u)"),
b2e465d6	99	Name,Addr->ai_family,Addr->ai_socktype,Addr->ai_protocol);
0837bd25 AL	100
	101	SetNonBlock(Fd,true);
	102	if (connect(Fd,Addr->ai_addr,Addr->ai_addrlen) < 0 &&
	103	errno != EINPROGRESS)
dc738e7a AL	104	return _error->Errno("connect",_("Cannot initiate the connection "
dc738e7a AL	105	"to %s:%s (%s)."),Host.c_str(),Service,Name);
0837bd25 AL	106
	107	/* This implements a timeout for connect by opening the connection
	108	nonblocking */
24057ad6	109	if (WaitFd(Fd,true,TimeOut) == false) {
8f3ba4e8	110	bad_addr.insert(bad_addr.begin(), std::string(Name));
36280399	111	Owner->SetFailReason("Timeout");
dc738e7a AL	112	return _error->Error(_("Could not connect to %s:%s (%s), "
dc738e7a AL	113	"connection timed out"),Host.c_str(),Service,Name);
24057ad6	114	}
b2e465d6	115
0837bd25 AL	116	// Check the socket for an error condition
	117	unsigned int Err;
	118	unsigned int Len = sizeof(Err);
	119	if (getsockopt(Fd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0)
dc738e7a	120	return _error->Errno("getsockopt",_("Failed"));
0837bd25 AL	121
0837bd25 AL	122	if (Err != 0)
28006885 AL	123	{
28006885 AL	124	errno = Err;
75dd8af1	125	if(errno == ECONNREFUSED)
36280399	126	Owner->SetFailReason("ConnectionRefused");
785b920b	127	else if (errno == ETIMEDOUT)
df3226c1	128	Owner->SetFailReason("ConnectionTimedOut");
8f3ba4e8	129	bad_addr.insert(bad_addr.begin(), std::string(Name));
dc738e7a	130	return _error->Errno("connect",_("Could not connect to %s:%s (%s)."),Host.c_str(),
28006885 AL	131	Service,Name);
	132	}
	133
0837bd25 AL	134	return true;
	135	}
	136	/}}}/
28006885	137
cc480014 MV	138	// Connect to a given Hostname
	139	bool ConnectAfterSrvRecords(std::string Host,int Port,const char *Service,
	140	int DefPort,int &Fd,
	141	unsigned long TimeOut,pkgAcqMethod *Owner)
	142	{
28006885 AL	143	// Convert the port name/number
	144	char ServStr[300];
	145	if (Port != 0)
9ce3cfc9	146	snprintf(ServStr,sizeof(ServStr),"%i", Port);
28006885	147	else
9ce3cfc9	148	snprintf(ServStr,sizeof(ServStr),"%s", Service);
0837bd25 AL	149
	150	/* We used a cached address record.. Yes this is against the spec but
	151	the way we have setup our rotating dns suggests that this is more
	152	sensible */
	153	if (LastHost != Host \|\| LastPort != Port)
	154	{
dc738e7a	155	Owner->Status(_("Connecting to %s"),Host.c_str());
0837bd25	156
0837bd25 AL	157	// Free the old address structure
	158	if (LastHostAddr != 0)
	159	{
	160	freeaddrinfo(LastHostAddr);
	161	LastHostAddr = 0;
28006885	162	LastUsed = 0;
0837bd25 AL	163	}
	164
	165	// We only understand SOCK_STREAM sockets.
	166	struct addrinfo Hints;
	167	memset(&Hints,0,sizeof(Hints));
	168	Hints.ai_socktype = SOCK_STREAM;
d746ad6e	169	Hints.ai_flags = AI_ADDRCONFIG;
28006885	170	Hints.ai_protocol = 0;
0837bd25	171
45d02095 MV	172	if(_config->FindB("Acquire::ForceIPv4", false) == true)
	173	Hints.ai_family = AF_INET;
	174	else if(_config->FindB("Acquire::ForceIPv6", false) == true)
	175	Hints.ai_family = AF_INET6;
	176	else
	177	Hints.ai_family = AF_UNSPEC;
	178
654881fb MV	179	// if we couldn't resolve the host before, we don't try now
	180	if(bad_addr.find(Host) != bad_addr.end())
	181	return _error->Error(_("Could not resolve '%s'"),Host.c_str());
	182
0837bd25	183	// Resolve both the host and service simultaneously
9505213b	184	while (1)
c141b9a9	185	{
9505213b	186	int Res;
28006885	187	if ((Res = getaddrinfo(Host.c_str(),ServStr,&Hints,&LastHostAddr)) != 0 \|\|
9505213b AL	188	LastHostAddr == 0)
9505213b AL	189	{
72472b95	190	if (Res == EAI_NONAME \|\| Res == EAI_SERVICE)
9505213b AL	191	{
	192	if (DefPort != 0)
	193	{
9ce3cfc9	194	snprintf(ServStr, sizeof(ServStr), "%i", DefPort);
9505213b AL	195	DefPort = 0;
	196	continue;
	197	}
654881fb	198	bad_addr.insert(bad_addr.begin(), Host);
59271f62	199	Owner->SetFailReason("ResolveFailure");
dc738e7a	200	return _error->Error(_("Could not resolve '%s'"),Host.c_str());
9505213b AL	201	}
9505213b AL	202
4fe6e0c2	203	if (Res == EAI_AGAIN)
25182152	204	{
36280399	205	Owner->SetFailReason("TmpResolveFailure");
dc738e7a	206	return _error->Error(_("Temporary failure resolving '%s'"),
4fe6e0c2	207	Host.c_str());
25182152	208	}
945d2a8a	209	if (Res == EAI_SYSTEM)
5cf466f4 MV	210	return _error->Errno("getaddrinfo", _("System error resolving '%s:%s'"),
5cf466f4 MV	211	Host.c_str(),ServStr);
ce26dee7 DK	212	return _error->Error(_("Something wicked happened resolving '%s:%s' (%i - %s)"),
ce26dee7 DK	213	Host.c_str(),ServStr,Res,gai_strerror(Res));
9505213b AL	214	}
9505213b AL	215	break;
c141b9a9 AL	216	}
c141b9a9 AL	217
0837bd25 AL	218	LastHost = Host;
0837bd25 AL	219	LastPort = Port;
0837bd25 AL	220	}
0837bd25 AL	221
28006885	222	// When we have an IP rotation stay with the last IP.
0837bd25 AL	223	struct addrinfo *CurHost = LastHostAddr;
	224	if (LastUsed != 0)
	225	CurHost = LastUsed;
	226
	227	while (CurHost != 0)
	228	{
	229	if (DoConnect(CurHost,Host,TimeOut,Fd,Owner) == true)
	230	{
	231	LastUsed = CurHost;
	232	return true;
	233	}
	234	close(Fd);
	235	Fd = -1;
	236
28006885 AL	237	// Ignore UNIX domain sockets
	238	do
	239	{
	240	CurHost = CurHost->ai_next;
	241	}
	242	while (CurHost != 0 && CurHost->ai_family == AF_UNIX);
b2e465d6 AL	243
	244	/* If we reached the end of the search list then wrap around to the
	245	start */
	246	if (CurHost == 0 && LastUsed != 0)
	247	CurHost = LastHostAddr;
	248
	249	// Reached the end of the search cycle
	250	if (CurHost == LastUsed)
	251	break;
	252
0837bd25 AL	253	if (CurHost != 0)
0837bd25 AL	254	_error->Discard();
b2e465d6	255	}
28006885	256
dd1fd92b	257	if (_error->PendingError() == true)
b2e465d6	258	return false;
cdd5a135	259	return _error->Error(_("Unable to connect to %s:%s:"),Host.c_str(),ServStr);
0837bd25 AL	260	}
0837bd25 AL	261	/}}}/
cc480014 MV	262	// Connect - Connect to a server /{{{/
	263	// ---------------------------------------------------------------------
	264	/* Performs a connection to the server */
	265	bool Connect(std::string Host,int Port,const char *Service,
	266	int DefPort,int &Fd,
	267	unsigned long TimeOut,pkgAcqMethod *Owner)
	268	{
	269	#if 0
	270	if (_error->PendingError() == true)
	271	return false;
	272	#endif
	273
	274	if(LastHost != Host \|\| LastPort != Port)
	275	{
	276	SrvRecords.clear();
	277	bool res = GetSrvRecords(Host, DefPort, SrvRecords);
	278	}
	279	if(SrvRecords.size() == 0)
	280	return ConnectAfterSrvRecords(Host, Port, Service, DefPort, Fd,
	281	TimeOut, Owner);
	282
	283	bool connected = false;
	284	while(SrvRecords.size() > 0)
	285	{
	286	Host = SrvRecords[0].target;
	287	connected = ConnectAfterSrvRecords(Host, Port, Service, DefPort, Fd,
	288	TimeOut, Owner);
	289	if(connected == true)
	290	return true;
	291
	292	// we couldn't connect to this one, use the next
	293	SrvRecords.erase(SrvRecords.begin());
	294	}
	295	return false;
	296	}