[apt.git] / methods / server.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
/* ######################################################################

   HTTP and HTTPS share a lot of common code and these classes are
   exactly the dumping ground for this common code

   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <config.h>

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

#include <ctype.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <iostream>
#include <limits>
#include <map>
#include <string>
#include <vector>

#include "server.h"

#include <apti18n.h>
									/*}}}*/
using namespace std;

string ServerMethod::FailFile;
int ServerMethod::FailFd = -1;
time_t ServerMethod::FailTime = 0;

// ServerState::RunHeaders - Get the headers before the data		/*{{{*/
// ---------------------------------------------------------------------
/* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header
   parse error occurred */
ServerState::RunHeadersResult ServerState::RunHeaders(FileFd * const File,
                                                      const std::string &Uri)
{
   State = Header;
   
   Owner->Status(_("Waiting for headers"));

   Major = 0; 
   Minor = 0; 
   Result = 0; 
   Size = 0; 
   JunkSize = 0;
   StartPos = 0;
   Encoding = Closes;
   HaveContent = false;
   time(&Date);

   do
   {
      string Data;
      if (ReadHeaderLines(Data) == false)
	 continue;

      if (Owner->Debug == true)
	 clog << "Answer for: " << Uri << endl << Data;
      
      for (string::const_iterator I = Data.begin(); I < Data.end(); ++I)
      {
	 string::const_iterator J = I;
	 for (; J != Data.end() && *J != '\n' && *J != '\r'; ++J);
	 if (HeaderLine(string(I,J)) == false)
	    return RUN_HEADERS_PARSE_ERROR;
	 I = J;
      }

      // 100 Continue is a Nop...
      if (Result == 100)
	 continue;
      
      // Tidy up the connection persistence state.
      if (Encoding == Closes && HaveContent == true)
	 Persistent = false;
      
      return RUN_HEADERS_OK;
   }
   while (LoadNextResponse(false, File) == true);
   
   return RUN_HEADERS_IO_ERROR;
}
									/*}}}*/
// ServerState::HeaderLine - Process a header line			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool ServerState::HeaderLine(string Line)
{
   if (Line.empty() == true)
      return true;

   string::size_type Pos = Line.find(' ');
   if (Pos == string::npos || Pos+1 > Line.length())
   {
      // Blah, some servers use "connection:closes", evil.
      Pos = Line.find(':');
      if (Pos == string::npos || Pos + 2 > Line.length())
	 return _error->Error(_("Bad header line"));
      Pos++;
   }

   // Parse off any trailing spaces between the : and the next word.
   string::size_type Pos2 = Pos;
   while (Pos2 < Line.length() && isspace(Line[Pos2]) != 0)
      Pos2++;

   string Tag = string(Line,0,Pos);
   string Val = string(Line,Pos2);

   if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0)
   {
      // Evil servers return no version
      if (Line[4] == '/')
      {
	 int const elements = sscanf(Line.c_str(),"HTTP/%3u.%3u %3u%359[^\n]",&Major,&Minor,&Result,Code);
	 if (elements == 3)
	 {
	    Code[0] = '\0';
	    if (Owner != NULL && Owner->Debug == true)
	       clog << "HTTP server doesn't give Reason-Phrase for " << Result << std::endl;
	 }
	 else if (elements != 4)
	    return _error->Error(_("The HTTP server sent an invalid reply header"));
      }
      else
      {
	 Major = 0;
	 Minor = 9;
	 if (sscanf(Line.c_str(),"HTTP %3u%359[^\n]",&Result,Code) != 2)
	    return _error->Error(_("The HTTP server sent an invalid reply header"));
      }

      /* Check the HTTP response header to get the default persistence
         state. */
      if (Major < 1)
	 Persistent = false;
      else
      {
	 if (Major == 1 && Minor == 0)
	    Persistent = false;
	 else
	    Persistent = true;
      }

      return true;
   }

   if (stringcasecmp(Tag,"Content-Length:") == 0)
   {
      if (Encoding == Closes)
	 Encoding = Stream;
      HaveContent = true;

      unsigned long long * SizePtr = &Size;
      if (Result == 416)
	 SizePtr = &JunkSize;

      *SizePtr = strtoull(Val.c_str(), NULL, 10);
      if (*SizePtr >= std::numeric_limits<unsigned long long>::max())
	 return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
      else if (*SizePtr == 0)
	 HaveContent = false;
      return true;
   }

   if (stringcasecmp(Tag,"Content-Type:") == 0)
   {
      HaveContent = true;
      return true;
   }

   if (stringcasecmp(Tag,"Content-Range:") == 0)
   {
      HaveContent = true;

      // §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
      if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&Size) == 1)
	 ; // we got the expected filesize which is all we wanted
      else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&Size) != 2)
	 return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
      if ((unsigned long long)StartPos > Size)
	 return _error->Error(_("This HTTP server has broken range support"));
      return true;
   }

   if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
   {
      HaveContent = true;
      if (stringcasecmp(Val,"chunked") == 0)
	 Encoding = Chunked;
      return true;
   }

   if (stringcasecmp(Tag,"Connection:") == 0)
   {
      if (stringcasecmp(Val,"close") == 0)
	 Persistent = false;
      if (stringcasecmp(Val,"keep-alive") == 0)
	 Persistent = true;
      return true;
   }

   if (stringcasecmp(Tag,"Last-Modified:") == 0)
   {
      if (RFC1123StrToTime(Val.c_str(), Date) == false)
	 return _error->Error(_("Unknown date format"));
      return true;
   }

   if (stringcasecmp(Tag,"Location:") == 0)
   {
      Location = Val;
      return true;
   }

   return true;
}
									/*}}}*/
// ServerState::ServerState - Constructor				/*{{{*/
ServerState::ServerState(URI Srv, ServerMethod *Owner) : ServerName(Srv), TimeOut(120), Owner(Owner)
{
   Reset();
}
									/*}}}*/
bool ServerState::AddPartialFileToHashes(FileFd &File)			/*{{{*/
{
   File.Truncate(StartPos);
   return GetHashes()->AddFD(File, StartPos);
}
									/*}}}*/

bool ServerMethod::Configuration(string Message)			/*{{{*/
{
   if (pkgAcqMethod::Configuration(Message) == false)
      return false;

   DropPrivsOrDie();

   return true;
}
									/*}}}*/

// ServerMethod::DealWithHeaders - Handle the retrieved header data	/*{{{*/
// ---------------------------------------------------------------------
/* We look at the header data we got back from the server and decide what
   to do. Returns DealWithHeadersResult (see http.h for details).
 */
ServerMethod::DealWithHeadersResult
ServerMethod::DealWithHeaders(FetchResult &Res)
{
   // Not Modified
   if (Server->Result == 304)
   {
      unlink(Queue->DestFile.c_str());
      Res.IMSHit = true;
      Res.LastModified = Queue->LastModified;
      return IMS_HIT;
   }
   
   /* Redirect
    *
    * Note that it is only OK for us to treat all redirection the same
    * because we *always* use GET, not other HTTP methods.  There are
    * three redirection codes for which it is not appropriate that we
    * redirect.  Pass on those codes so the error handling kicks in.
    */
   if (AllowRedirect
       && (Server->Result > 300 && Server->Result < 400)
       && (Server->Result != 300       // Multiple Choices
           && Server->Result != 304    // Not Modified
           && Server->Result != 306))  // (Not part of HTTP/1.1, reserved)
   {
      if (Server->Location.empty() == true);
      else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
      {
	 URI Uri = Queue->Uri;
	 if (Uri.Host.empty() == false)
            NextURI = URI::SiteOnly(Uri);
	 else
	    NextURI.clear();
	 NextURI.append(DeQuoteString(Server->Location));
	 return TRY_AGAIN_OR_REDIRECT;
      }
      else
      {
	 NextURI = DeQuoteString(Server->Location);
	 URI tmpURI = NextURI;
	 URI Uri = Queue->Uri;
	 // same protocol redirects are okay
	 if (tmpURI.Access == Uri.Access)
	    return TRY_AGAIN_OR_REDIRECT;
	 // as well as http to https
	 else if (Uri.Access == "http" && tmpURI.Access == "https")
	    return TRY_AGAIN_OR_REDIRECT;
      }
      /* else pass through for error message */
   }
   // retry after an invalid range response without partial data
   else if (Server->Result == 416)
   {
      struct stat SBuf;
      if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
      {
	 if ((unsigned long long)SBuf.st_size == Server->Size)
	 {
	    // the file is completely downloaded, but was not moved
	    if (Server->HaveContent == true)
	    {
	       // Send to error page to dev/null
	       FileFd DevNull("/dev/null",FileFd::WriteExists);
	       Server->RunData(&DevNull);
	    }
	    Server->HaveContent = false;
	    Server->StartPos = Server->Size;
	    Server->Result = 200;
	 }
	 else if (unlink(Queue->DestFile.c_str()) == 0)
	 {
	    NextURI = Queue->Uri;
	    return TRY_AGAIN_OR_REDIRECT;
	 }
      }
   }

   /* We have a reply we dont handle. This should indicate a perm server
      failure */
   if (Server->Result < 200 || Server->Result >= 300)
   {
      std::string err;
      strprintf(err, "HttpError%u", Server->Result);
      SetFailReason(err);
      _error->Error("%u %s", Server->Result, Server->Code);
      if (Server->HaveContent == true)
	 return ERROR_WITH_CONTENT_PAGE;
      return ERROR_UNRECOVERABLE;
   }

   // This is some sort of 2xx 'data follows' reply
   Res.LastModified = Server->Date;
   Res.Size = Server->Size;
   
   // Open the file
   delete File;
   File = new FileFd(Queue->DestFile,FileFd::WriteAny);
   if (_error->PendingError() == true)
      return ERROR_NOT_FROM_SERVER;

   FailFile = Queue->DestFile;
   FailFile.c_str();   // Make sure we dont do a malloc in the signal handler
   FailFd = File->Fd();
   FailTime = Server->Date;

   if (Server->InitHashes(Queue->ExpectedHashes) == false || Server->AddPartialFileToHashes(*File) == false)
   {
      _error->Errno("read",_("Problem hashing file"));
      return ERROR_NOT_FROM_SERVER;
   }
   if (Server->StartPos > 0)
      Res.ResumePoint = Server->StartPos;

   SetNonBlock(File->Fd(),true);
   return FILE_IS_OPEN;
}
									/*}}}*/
// ServerMethod::SigTerm - Handle a fatal signal			/*{{{*/
// ---------------------------------------------------------------------
/* This closes and timestamps the open file. This is necessary to get
   resume behavoir on user abort */
void ServerMethod::SigTerm(int)
{
   if (FailFd == -1)
      _exit(100);

   struct timeval times[2];
   times[0].tv_sec = FailTime;
   times[1].tv_sec = FailTime;
   times[0].tv_usec = times[1].tv_usec = 0;
   utimes(FailFile.c_str(), times);
   close(FailFd);

   _exit(100);
}
									/*}}}*/
// ServerMethod::Fetch - Fetch an item					/*{{{*/
// ---------------------------------------------------------------------
/* This adds an item to the pipeline. We keep the pipeline at a fixed
   depth. */
bool ServerMethod::Fetch(FetchItem *)
{
   if (Server == 0)
      return true;

   // Queue the requests
   int Depth = -1;
   for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth; 
	I = I->Next, Depth++)
   {
      if (Depth >= 0)
      {
	 // If pipelining is disabled, we only queue 1 request
	 if (Server->Pipeline == false)
	    break;
	 // if we have no hashes, do at most one such request
	 // as we can't fixup pipeling misbehaviors otherwise
	 else if (I->ExpectedHashes.usable() == false)
	    break;
      }
      
      // Make sure we stick with the same server
      if (Server->Comp(I->Uri) == false)
	 break;
      if (QueueBack == I)
      {
	 QueueBack = I->Next;
	 SendReq(I);
	 continue;
      }
   }
   
   return true;
}
									/*}}}*/
// ServerMethod::Loop - Main loop					/*{{{*/
int ServerMethod::Loop()
{
   typedef vector<string> StringVector;
   typedef vector<string>::iterator StringVectorIterator;
   map<string, StringVector> Redirected;

   signal(SIGTERM,SigTerm);
   signal(SIGINT,SigTerm);
   
   Server = 0;
   
   int FailCounter = 0;
   while (1)
   {      
      // We have no commands, wait for some to arrive
      if (Queue == 0)
      {
	 if (WaitFd(STDIN_FILENO) == false)
	    return 0;
      }
      
      /* Run messages, we can accept 0 (no message) if we didn't
         do a WaitFd above.. Otherwise the FD is closed. */
      int Result = Run(true);
      if (Result != -1 && (Result != 0 || Queue == 0))
      {
	 if(FailReason.empty() == false ||
	    _config->FindB("Acquire::http::DependOnSTDIN", true) == true)
	    return 100;
	 else
	    return 0;
      }

      if (Queue == 0)
	 continue;
      
      // Connect to the server
      if (Server == 0 || Server->Comp(Queue->Uri) == false)
      {
	 delete Server;
	 Server = CreateServerState(Queue->Uri);
      }
      /* If the server has explicitly said this is the last connection
         then we pre-emptively shut down the pipeline and tear down 
	 the connection. This will speed up HTTP/1.0 servers a tad
	 since we don't have to wait for the close sequence to
         complete */
      if (Server->Persistent == false)
	 Server->Close();

      // Reset the pipeline
      if (Server->IsOpen() == false)
	 QueueBack = Queue;

      // Connnect to the host
      if (Server->Open() == false)
      {
	 Fail(true);
	 delete Server;
	 Server = 0;
	 continue;
      }

      // Fill the pipeline.
      Fetch(0);
      
      // Fetch the next URL header data from the server.
      switch (Server->RunHeaders(File, Queue->Uri))
      {
	 case ServerState::RUN_HEADERS_OK:
	 break;
	 
	 // The header data is bad
	 case ServerState::RUN_HEADERS_PARSE_ERROR:
	 {
	    _error->Error(_("Bad header data"));
	    Fail(true);
	    RotateDNS();
	    continue;
	 }
	 
	 // The server closed a connection during the header get..
	 default:
	 case ServerState::RUN_HEADERS_IO_ERROR:
	 {
	    FailCounter++;
	    _error->Discard();
	    Server->Close();
	    Server->Pipeline = false;
	    
	    if (FailCounter >= 2)
	    {
	       Fail(_("Connection failed"),true);
	       FailCounter = 0;
	    }
	    
	    RotateDNS();
	    continue;
	 }
      };

      // Decide what to do.
      FetchResult Res;
      Res.Filename = Queue->DestFile;
      switch (DealWithHeaders(Res))
      {
	 // Ok, the file is Open
	 case FILE_IS_OPEN:
	 {
	    URIStart(Res);

	    // Run the data
	    bool Result = true;

            // ensure we don't fetch too much
            // we could do "Server->MaximumSize = Queue->MaximumSize" here
            // but that would break the clever pipeline messup detection
            // so instead we use the size of the biggest item in the queue
            Server->MaximumSize = FindMaximumObjectSizeInQueue();

            if (Server->HaveContent)
	       Result = Server->RunData(File);

	    /* If the server is sending back sizeless responses then fill in
	       the size now */
	    if (Res.Size == 0)
	       Res.Size = File->Size();
	    
	    // Close the file, destroy the FD object and timestamp it
	    FailFd = -1;
	    delete File;
	    File = 0;
	    
	    // Timestamp
	    struct timeval times[2];
	    times[0].tv_sec = times[1].tv_sec = Server->Date;
	    times[0].tv_usec = times[1].tv_usec = 0;
	    utimes(Queue->DestFile.c_str(), times);

	    // Send status to APT
	    if (Result == true)
	    {
	       Hashes * const resultHashes = Server->GetHashes();
	       HashStringList const hashList = resultHashes->GetHashStringList();
	       if (PipelineDepth != 0 && Queue->ExpectedHashes.usable() == true && Queue->ExpectedHashes != hashList)
	       {
		  // we did not get the expected hash… mhhh:
		  // could it be that server/proxy messed up pipelining?
		  FetchItem * BeforeI = Queue;
		  for (FetchItem *I = Queue->Next; I != 0 && I != QueueBack; I = I->Next)
		  {
		     if (I->ExpectedHashes.usable() == true && I->ExpectedHashes == hashList)
		     {
			// yes, he did! Disable pipelining and rewrite queue
			if (Server->Pipeline == true)
			{
			   // FIXME: fake a warning message as we have no proper way of communicating here
			   std::string out;
			   strprintf(out, _("Automatically disabled %s due to incorrect response from server/proxy. (man 5 apt.conf)"), "Acquire::http::PipelineDepth");
			   std::cerr << "W: " << out << std::endl;
			   Server->Pipeline = false;
			   // we keep the PipelineDepth value so that the rest of the queue can be fixed up as well
			}
			Rename(Res.Filename, I->DestFile);
			Res.Filename = I->DestFile;
			BeforeI->Next = I->Next;
			I->Next = Queue;
			Queue = I;
			break;
		     }
		     BeforeI = I;
		  }
	       }
	       Res.TakeHashes(*resultHashes);
	       URIDone(Res);
	    }
	    else
	    {
	       if (Server->IsOpen() == false)
	       {
		  FailCounter++;
		  _error->Discard();
		  Server->Close();
		  
		  if (FailCounter >= 2)
		  {
		     Fail(_("Connection failed"),true);
		     FailCounter = 0;
		  }
		  
		  QueueBack = Queue;
	       }
	       else
               {
                  Server->Close();
		  Fail(true);
               }
	    }
	    break;
	 }
	 
	 // IMS hit
	 case IMS_HIT:
	 {
	    URIDone(Res);
	    break;
	 }
	 
	 // Hard server error, not found or something
	 case ERROR_UNRECOVERABLE:
	 {
	    Fail();
	    break;
	 }
	  
	 // Hard internal error, kill the connection and fail
	 case ERROR_NOT_FROM_SERVER:
	 {
	    delete File;
	    File = 0;

	    Fail();
	    RotateDNS();
	    Server->Close();
	    break;
	 }

	 // We need to flush the data, the header is like a 404 w/ error text
	 case ERROR_WITH_CONTENT_PAGE:
	 {
	    Fail();
	    
	    // Send to content to dev/null
	    File = new FileFd("/dev/null",FileFd::WriteExists);
	    Server->RunData(File);
	    delete File;
	    File = 0;
	    break;
	 }
	 
         // Try again with a new URL
         case TRY_AGAIN_OR_REDIRECT:
         {
            // Clear rest of response if there is content
            if (Server->HaveContent)
            {
               File = new FileFd("/dev/null",FileFd::WriteExists);
               Server->RunData(File);
               delete File;
               File = 0;
            }

            /* Detect redirect loops.  No more redirects are allowed
               after the same URI is seen twice in a queue item. */
            StringVector &R = Redirected[Queue->DestFile];
            bool StopRedirects = false;
            if (R.empty() == true)
               R.push_back(Queue->Uri);
            else if (R[0] == "STOP" || R.size() > 10)
               StopRedirects = true;
            else
            {
               for (StringVectorIterator I = R.begin(); I != R.end(); ++I)
                  if (Queue->Uri == *I)
                  {
                     R[0] = "STOP";
                     break;
                  }
 
               R.push_back(Queue->Uri);
            }
 
            if (StopRedirects == false)
               Redirect(NextURI);
            else
               Fail();
 
            break;
         }

	 default:
	 Fail(_("Internal error"));
	 break;
      }
      
      FailCounter = 0;
   }
   
   return 0;
}
									/*}}}*/
                         						/*{{{*/
unsigned long long
ServerMethod::FindMaximumObjectSizeInQueue() const 
{
   unsigned long long MaxSizeInQueue = 0;
   for (FetchItem *I = Queue; I != 0 && I != QueueBack; I = I->Next)
      MaxSizeInQueue = std::max(MaxSizeInQueue, I->MaximumSize);
   return MaxSizeInQueue;
}
									/*}}}*/
Commit	Line	Data
7330f4df DK	1	// -- mode: cpp; mode: fold --
	2	// Description /{{{/
	3	/* ######################################################################
	4
	5	HTTP and HTTPS share a lot of common code and these classes are
	6	exactly the dumping ground for this common code
	7
	8	##################################################################### */
	9	/}}}/
	10	// Include Files /{{{/
	11	#include <config.h>
	12
7330f4df DK	13	#include <apt-pkg/acquire-method.h>
	14	#include <apt-pkg/configuration.h>
	15	#include <apt-pkg/error.h>
453b82a3 DK	16	#include <apt-pkg/fileutl.h>
453b82a3 DK	17	#include <apt-pkg/strutl.h>
7330f4df	18
453b82a3 DK	19	#include <ctype.h>
	20	#include <signal.h>
	21	#include <stdio.h>
	22	#include <stdlib.h>
7330f4df DK	23	#include <sys/stat.h>
7330f4df DK	24	#include <sys/time.h>
453b82a3	25	#include <time.h>
7330f4df	26	#include <unistd.h>
7330f4df	27	#include <iostream>
453b82a3	28	#include <limits>
7330f4df	29	#include <map>
453b82a3 DK	30	#include <string>
453b82a3 DK	31	#include <vector>
7330f4df	32
453b82a3	33	#include "server.h"
7330f4df DK	34
	35	#include <apti18n.h>
	36	/}}}/
	37	using namespace std;
	38
	39	string ServerMethod::FailFile;
	40	int ServerMethod::FailFd = -1;
	41	time_t ServerMethod::FailTime = 0;
	42
	43	// ServerState::RunHeaders - Get the headers before the data /{{{/
	44	// ---------------------------------------------------------------------
	45	/* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header
	46	parse error occurred */
9622b211 MV	47	ServerState::RunHeadersResult ServerState::RunHeaders(FileFd * const File,
9622b211 MV	48	const std::string &Uri)
7330f4df DK	49	{
	50	State = Header;
	51
	52	Owner->Status(_("Waiting for headers"));
	53
	54	Major = 0;
	55	Minor = 0;
	56	Result = 0;
	57	Size = 0;
ed793a19	58	JunkSize = 0;
7330f4df DK	59	StartPos = 0;
	60	Encoding = Closes;
	61	HaveContent = false;
	62	time(&Date);
	63
	64	do
	65	{
	66	string Data;
	67	if (ReadHeaderLines(Data) == false)
	68	continue;
	69
	70	if (Owner->Debug == true)
9622b211	71	clog << "Answer for: " << Uri << endl << Data;
7330f4df DK	72
	73	for (string::const_iterator I = Data.begin(); I < Data.end(); ++I)
	74	{
	75	string::const_iterator J = I;
	76	for (; J != Data.end() && J != '\n' && J != '\r'; ++J);
	77	if (HeaderLine(string(I,J)) == false)
	78	return RUN_HEADERS_PARSE_ERROR;
	79	I = J;
	80	}
	81
	82	// 100 Continue is a Nop...
	83	if (Result == 100)
	84	continue;
	85
1e3f4083	86	// Tidy up the connection persistence state.
7330f4df DK	87	if (Encoding == Closes && HaveContent == true)
	88	Persistent = false;
	89
	90	return RUN_HEADERS_OK;
	91	}
	92	while (LoadNextResponse(false, File) == true);
	93
	94	return RUN_HEADERS_IO_ERROR;
	95	}
	96	/}}}/
	97	// ServerState::HeaderLine - Process a header line /{{{/
	98	// ---------------------------------------------------------------------
	99	/* */
	100	bool ServerState::HeaderLine(string Line)
	101	{
	102	if (Line.empty() == true)
	103	return true;
	104
	105	string::size_type Pos = Line.find(' ');
	106	if (Pos == string::npos \|\| Pos+1 > Line.length())
	107	{
	108	// Blah, some servers use "connection:closes", evil.
	109	Pos = Line.find(':');
	110	if (Pos == string::npos \|\| Pos + 2 > Line.length())
	111	return _error->Error(_("Bad header line"));
	112	Pos++;
	113	}
	114
	115	// Parse off any trailing spaces between the : and the next word.
	116	string::size_type Pos2 = Pos;
	117	while (Pos2 < Line.length() && isspace(Line[Pos2]) != 0)
	118	Pos2++;
d3e8fbb3	119
7330f4df DK	120	string Tag = string(Line,0,Pos);
7330f4df DK	121	string Val = string(Line,Pos2);
d3e8fbb3	122
7330f4df DK	123	if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0)
	124	{
	125	// Evil servers return no version
	126	if (Line[4] == '/')
	127	{
	128	int const elements = sscanf(Line.c_str(),"HTTP/%3u.%3u %3u%359[^\n]",&Major,&Minor,&Result,Code);
	129	if (elements == 3)
	130	{
	131	Code[0] = '\0';
0c2dc43d	132	if (Owner != NULL && Owner->Debug == true)
7330f4df DK	133	clog << "HTTP server doesn't give Reason-Phrase for " << Result << std::endl;
	134	}
	135	else if (elements != 4)
	136	return _error->Error(_("The HTTP server sent an invalid reply header"));
	137	}
	138	else
	139	{
	140	Major = 0;
	141	Minor = 9;
	142	if (sscanf(Line.c_str(),"HTTP %3u%359[^\n]",&Result,Code) != 2)
	143	return _error->Error(_("The HTTP server sent an invalid reply header"));
	144	}
	145
1e3f4083	146	/* Check the HTTP response header to get the default persistence
7330f4df DK	147	state. */
	148	if (Major < 1)
	149	Persistent = false;
	150	else
	151	{
	152	if (Major == 1 && Minor == 0)
	153	Persistent = false;
	154	else
	155	Persistent = true;
	156	}
	157
	158	return true;
d3e8fbb3 DK	159	}
d3e8fbb3 DK	160
7330f4df DK	161	if (stringcasecmp(Tag,"Content-Length:") == 0)
	162	{
	163	if (Encoding == Closes)
	164	Encoding = Stream;
	165	HaveContent = true;
d3e8fbb3	166
ed793a19 DK	167	unsigned long long * SizePtr = &Size;
	168	if (Result == 416)
	169	SizePtr = &JunkSize;
7330f4df	170
ed793a19 DK	171	*SizePtr = strtoull(Val.c_str(), NULL, 10);
ed793a19 DK	172	if (*SizePtr >= std::numeric_limits<unsigned long long>::max())
7330f4df	173	return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
ed793a19	174	else if (*SizePtr == 0)
7330f4df DK	175	HaveContent = false;
	176	return true;
	177	}
	178
	179	if (stringcasecmp(Tag,"Content-Type:") == 0)
	180	{
	181	HaveContent = true;
	182	return true;
	183	}
d3e8fbb3	184
7330f4df DK	185	if (stringcasecmp(Tag,"Content-Range:") == 0)
	186	{
	187	HaveContent = true;
	188
	189	// §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
	190	if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&Size) == 1)
ed793a19	191	; // we got the expected filesize which is all we wanted
7330f4df DK	192	else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&Size) != 2)
	193	return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
	194	if ((unsigned long long)StartPos > Size)
	195	return _error->Error(_("This HTTP server has broken range support"));
	196	return true;
	197	}
d3e8fbb3	198
7330f4df DK	199	if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
	200	{
	201	HaveContent = true;
	202	if (stringcasecmp(Val,"chunked") == 0)
d3e8fbb3	203	Encoding = Chunked;
7330f4df DK	204	return true;
	205	}
	206
	207	if (stringcasecmp(Tag,"Connection:") == 0)
	208	{
	209	if (stringcasecmp(Val,"close") == 0)
	210	Persistent = false;
	211	if (stringcasecmp(Val,"keep-alive") == 0)
	212	Persistent = true;
	213	return true;
	214	}
d3e8fbb3	215
7330f4df DK	216	if (stringcasecmp(Tag,"Last-Modified:") == 0)
	217	{
	218	if (RFC1123StrToTime(Val.c_str(), Date) == false)
	219	return _error->Error(_("Unknown date format"));
	220	return true;
	221	}
	222
	223	if (stringcasecmp(Tag,"Location:") == 0)
	224	{
	225	Location = Val;
	226	return true;
	227	}
	228
	229	return true;
	230	}
	231	/}}}/
	232	// ServerState::ServerState - Constructor /{{{/
	233	ServerState::ServerState(URI Srv, ServerMethod *Owner) : ServerName(Srv), TimeOut(120), Owner(Owner)
	234	{
	235	Reset();
	236	}
	237	/}}}/
34faa8f7 DK	238	bool ServerState::AddPartialFileToHashes(FileFd &File) /{{{/
	239	{
	240	File.Truncate(StartPos);
	241	return GetHashes()->AddFD(File, StartPos);
	242	}
	243	/}}}/
7330f4df DK	244
	245	bool ServerMethod::Configuration(string Message) /{{{/
	246	{
905fba60 DK	247	if (pkgAcqMethod::Configuration(Message) == false)
	248	return false;
	249
	250	DropPrivsOrDie();
	251
	252	return true;
7330f4df DK	253	}
	254	/}}}/
	255
	256	// ServerMethod::DealWithHeaders - Handle the retrieved header data /{{{/
	257	// ---------------------------------------------------------------------
	258	/* We look at the header data we got back from the server and decide what
	259	to do. Returns DealWithHeadersResult (see http.h for details).
	260	*/
	261	ServerMethod::DealWithHeadersResult
	262	ServerMethod::DealWithHeaders(FetchResult &Res)
	263	{
	264	// Not Modified
	265	if (Server->Result == 304)
	266	{
	267	unlink(Queue->DestFile.c_str());
	268	Res.IMSHit = true;
	269	Res.LastModified = Queue->LastModified;
	270	return IMS_HIT;
	271	}
	272
	273	/* Redirect
	274	*
	275	* Note that it is only OK for us to treat all redirection the same
	276	* because we always use GET, not other HTTP methods. There are
	277	* three redirection codes for which it is not appropriate that we
	278	* redirect. Pass on those codes so the error handling kicks in.
	279	*/
	280	if (AllowRedirect
	281	&& (Server->Result > 300 && Server->Result < 400)
	282	&& (Server->Result != 300 // Multiple Choices
	283	&& Server->Result != 304 // Not Modified
	284	&& Server->Result != 306)) // (Not part of HTTP/1.1, reserved)
	285	{
	286	if (Server->Location.empty() == true);
	287	else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
	288	{
	289	URI Uri = Queue->Uri;
	290	if (Uri.Host.empty() == false)
	291	NextURI = URI::SiteOnly(Uri);
	292	else
	293	NextURI.clear();
	294	NextURI.append(DeQuoteString(Server->Location));
	295	return TRY_AGAIN_OR_REDIRECT;
	296	}
	297	else
	298	{
9082a1fc DK	299	NextURI = DeQuoteString(Server->Location);
	300	URI tmpURI = NextURI;
	301	URI Uri = Queue->Uri;
	302	// same protocol redirects are okay
	303	if (tmpURI.Access == Uri.Access)
	304	return TRY_AGAIN_OR_REDIRECT;
	305	// as well as http to https
	306	else if (Uri.Access == "http" && tmpURI.Access == "https")
	307	return TRY_AGAIN_OR_REDIRECT;
7330f4df DK	308	}
	309	/* else pass through for error message */
	310	}
	311	// retry after an invalid range response without partial data
	312	else if (Server->Result == 416)
	313	{
	314	struct stat SBuf;
	315	if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
	316	{
	317	if ((unsigned long long)SBuf.st_size == Server->Size)
	318	{
	319	// the file is completely downloaded, but was not moved
ed793a19 DK	320	if (Server->HaveContent == true)
	321	{
	322	// Send to error page to dev/null
	323	FileFd DevNull("/dev/null",FileFd::WriteExists);
	324	Server->RunData(&DevNull);
	325	}
	326	Server->HaveContent = false;
7330f4df DK	327	Server->StartPos = Server->Size;
7330f4df DK	328	Server->Result = 200;
7330f4df DK	329	}
	330	else if (unlink(Queue->DestFile.c_str()) == 0)
	331	{
	332	NextURI = Queue->Uri;
	333	return TRY_AGAIN_OR_REDIRECT;
	334	}
	335	}
	336	}
	337
	338	/* We have a reply we dont handle. This should indicate a perm server
	339	failure */
	340	if (Server->Result < 200 \|\| Server->Result >= 300)
	341	{
84361def DK	342	std::string err;
84361def DK	343	strprintf(err, "HttpError%u", Server->Result);
7330f4df	344	SetFailReason(err);
84361def	345	_error->Error("%u %s", Server->Result, Server->Code);
7330f4df DK	346	if (Server->HaveContent == true)
	347	return ERROR_WITH_CONTENT_PAGE;
	348	return ERROR_UNRECOVERABLE;
	349	}
	350
	351	// This is some sort of 2xx 'data follows' reply
	352	Res.LastModified = Server->Date;
	353	Res.Size = Server->Size;
	354
	355	// Open the file
	356	delete File;
	357	File = new FileFd(Queue->DestFile,FileFd::WriteAny);
	358	if (_error->PendingError() == true)
	359	return ERROR_NOT_FROM_SERVER;
	360
	361	FailFile = Queue->DestFile;
	362	FailFile.c_str(); // Make sure we dont do a malloc in the signal handler
	363	FailFd = File->Fd();
	364	FailTime = Server->Date;
	365
34faa8f7	366	if (Server->InitHashes(Queue->ExpectedHashes) == false \|\| Server->AddPartialFileToHashes(*File) == false)
7330f4df DK	367	{
	368	_error->Errno("read",_("Problem hashing file"));
	369	return ERROR_NOT_FROM_SERVER;
	370	}
	371	if (Server->StartPos > 0)
	372	Res.ResumePoint = Server->StartPos;
	373
	374	SetNonBlock(File->Fd(),true);
	375	return FILE_IS_OPEN;
	376	}
	377	/}}}/
	378	// ServerMethod::SigTerm - Handle a fatal signal /{{{/
	379	// ---------------------------------------------------------------------
1e3f4083	380	/* This closes and timestamps the open file. This is necessary to get
7330f4df DK	381	resume behavoir on user abort */
	382	void ServerMethod::SigTerm(int)
	383	{
	384	if (FailFd == -1)
	385	_exit(100);
9ce3cfc9	386
246bbb61	387	struct timeval times[2];
9ce3cfc9 DK	388	times[0].tv_sec = FailTime;
9ce3cfc9 DK	389	times[1].tv_sec = FailTime;
246bbb61 DK	390	times[0].tv_usec = times[1].tv_usec = 0;
246bbb61 DK	391	utimes(FailFile.c_str(), times);
7330f4df	392	close(FailFd);
9ce3cfc9	393
7330f4df DK	394	_exit(100);
	395	}
	396	/}}}/
	397	// ServerMethod::Fetch - Fetch an item /{{{/
	398	// ---------------------------------------------------------------------
	399	/* This adds an item to the pipeline. We keep the pipeline at a fixed
	400	depth. */
	401	bool ServerMethod::Fetch(FetchItem *)
	402	{
	403	if (Server == 0)
	404	return true;
	405
	406	// Queue the requests
	407	int Depth = -1;
	408	for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
	409	I = I->Next, Depth++)
	410	{
895417ef DK	411	if (Depth >= 0)
	412	{
	413	// If pipelining is disabled, we only queue 1 request
	414	if (Server->Pipeline == false)
	415	break;
	416	// if we have no hashes, do at most one such request
	417	// as we can't fixup pipeling misbehaviors otherwise
	418	else if (I->ExpectedHashes.usable() == false)
	419	break;
	420	}
7330f4df DK	421
	422	// Make sure we stick with the same server
	423	if (Server->Comp(I->Uri) == false)
	424	break;
	425	if (QueueBack == I)
	426	{
	427	QueueBack = I->Next;
	428	SendReq(I);
	429	continue;
	430	}
	431	}
	432
	433	return true;
d3e8fbb3	434	}
7330f4df DK	435	/}}}/
	436	// ServerMethod::Loop - Main loop /{{{/
	437	int ServerMethod::Loop()
	438	{
	439	typedef vector<string> StringVector;
	440	typedef vector<string>::iterator StringVectorIterator;
	441	map<string, StringVector> Redirected;
	442
	443	signal(SIGTERM,SigTerm);
	444	signal(SIGINT,SigTerm);
	445
	446	Server = 0;
	447
	448	int FailCounter = 0;
	449	while (1)
	450	{
	451	// We have no commands, wait for some to arrive
	452	if (Queue == 0)
	453	{
	454	if (WaitFd(STDIN_FILENO) == false)
	455	return 0;
	456	}
	457
	458	/* Run messages, we can accept 0 (no message) if we didn't
	459	do a WaitFd above.. Otherwise the FD is closed. */
	460	int Result = Run(true);
	461	if (Result != -1 && (Result != 0 \|\| Queue == 0))
	462	{
	463	if(FailReason.empty() == false \|\|
	464	_config->FindB("Acquire::http::DependOnSTDIN", true) == true)
	465	return 100;
	466	else
	467	return 0;
	468	}
	469
	470	if (Queue == 0)
	471	continue;
	472
	473	// Connect to the server
	474	if (Server == 0 \|\| Server->Comp(Queue->Uri) == false)
	475	{
	476	delete Server;
	477	Server = CreateServerState(Queue->Uri);
	478	}
	479	/* If the server has explicitly said this is the last connection
	480	then we pre-emptively shut down the pipeline and tear down
	481	the connection. This will speed up HTTP/1.0 servers a tad
	482	since we don't have to wait for the close sequence to
	483	complete */
	484	if (Server->Persistent == false)
	485	Server->Close();
	486
	487	// Reset the pipeline
	488	if (Server->IsOpen() == false)
	489	QueueBack = Queue;
	490
	491	// Connnect to the host
	492	if (Server->Open() == false)
	493	{
	494	Fail(true);
	495	delete Server;
	496	Server = 0;
	497	continue;
	498	}
499
500	// Fill the pipeline.
501	Fetch(0);
502
503	// Fetch the next URL header data from the server.
9622b211	504	switch (Server->RunHeaders(File, Queue->Uri))
7330f4df DK	505	{
	506	case ServerState::RUN_HEADERS_OK:
	507	break;
	508
	509	// The header data is bad
	510	case ServerState::RUN_HEADERS_PARSE_ERROR:
	511	{
	512	_error->Error(_("Bad header data"));
	513	Fail(true);
	514	RotateDNS();
	515	continue;
	516	}
	517
	518	// The server closed a connection during the header get..
	519	default:
	520	case ServerState::RUN_HEADERS_IO_ERROR:
	521	{
	522	FailCounter++;
	523	_error->Discard();
	524	Server->Close();
	525	Server->Pipeline = false;
	526
	527	if (FailCounter >= 2)
	528	{
	529	Fail(_("Connection failed"),true);
	530	FailCounter = 0;
	531	}
	532
	533	RotateDNS();
	534	continue;
	535	}
	536	};
	537
	538	// Decide what to do.
	539	FetchResult Res;
	540	Res.Filename = Queue->DestFile;
	541	switch (DealWithHeaders(Res))
	542	{
	543	// Ok, the file is Open
	544	case FILE_IS_OPEN:
	545	{
	546	URIStart(Res);
	547
	548	// Run the data
	549	bool Result = true;
dcd5856b MV	550
dcd5856b MV	551	// ensure we don't fetch too much
f2b47ba2 MV	552	// we could do "Server->MaximumSize = Queue->MaximumSize" here
	553	// but that would break the clever pipeline messup detection
	554	// so instead we use the size of the biggest item in the queue
	555	Server->MaximumSize = FindMaximumObjectSizeInQueue();
dcd5856b	556
7330f4df DK	557	if (Server->HaveContent)
	558	Result = Server->RunData(File);
	559
	560	/* If the server is sending back sizeless responses then fill in
	561	the size now */
	562	if (Res.Size == 0)
	563	Res.Size = File->Size();
	564
	565	// Close the file, destroy the FD object and timestamp it
	566	FailFd = -1;
	567	delete File;
	568	File = 0;
	569
	570	// Timestamp
246bbb61	571	struct timeval times[2];
9ce3cfc9	572	times[0].tv_sec = times[1].tv_sec = Server->Date;
246bbb61 DK	573	times[0].tv_usec = times[1].tv_usec = 0;
246bbb61 DK	574	utimes(Queue->DestFile.c_str(), times);
7330f4df DK	575
	576	// Send status to APT
	577	if (Result == true)
	578	{
895417ef DK	579	Hashes * const resultHashes = Server->GetHashes();
	580	HashStringList const hashList = resultHashes->GetHashStringList();
	581	if (PipelineDepth != 0 && Queue->ExpectedHashes.usable() == true && Queue->ExpectedHashes != hashList)
	582	{
	583	// we did not get the expected hash… mhhh:
	584	// could it be that server/proxy messed up pipelining?
	585	FetchItem * BeforeI = Queue;
	586	for (FetchItem *I = Queue->Next; I != 0 && I != QueueBack; I = I->Next)
	587	{
	588	if (I->ExpectedHashes.usable() == true && I->ExpectedHashes == hashList)
	589	{
	590	// yes, he did! Disable pipelining and rewrite queue
	591	if (Server->Pipeline == true)
	592	{
	593	// FIXME: fake a warning message as we have no proper way of communicating here
	594	std::string out;
	595	strprintf(out, _("Automatically disabled %s due to incorrect response from server/proxy. (man 5 apt.conf)"), "Acquire::http::PipelineDepth");
	596	std::cerr << "W: " << out << std::endl;
	597	Server->Pipeline = false;
	598	// we keep the PipelineDepth value so that the rest of the queue can be fixed up as well
	599	}
	600	Rename(Res.Filename, I->DestFile);
	601	Res.Filename = I->DestFile;
	602	BeforeI->Next = I->Next;
	603	I->Next = Queue;
	604	Queue = I;
	605	break;
	606	}
	607	BeforeI = I;
	608	}
	609	}
	610	Res.TakeHashes(*resultHashes);
7330f4df DK	611	URIDone(Res);
	612	}
	613	else
	614	{
	615	if (Server->IsOpen() == false)
	616	{
	617	FailCounter++;
	618	_error->Discard();
	619	Server->Close();
	620
	621	if (FailCounter >= 2)
	622	{
	623	Fail(_("Connection failed"),true);
	624	FailCounter = 0;
	625	}
	626
	627	QueueBack = Queue;
	628	}
	629	else
a2d40703 MV	630	{
a2d40703 MV	631	Server->Close();
7330f4df	632	Fail(true);
a2d40703	633	}
7330f4df DK	634	}
	635	break;
	636	}
	637
	638	// IMS hit
	639	case IMS_HIT:
	640	{
	641	URIDone(Res);
	642	break;
	643	}
	644
	645	// Hard server error, not found or something
	646	case ERROR_UNRECOVERABLE:
	647	{
	648	Fail();
	649	break;
	650	}
	651
	652	// Hard internal error, kill the connection and fail
	653	case ERROR_NOT_FROM_SERVER:
	654	{
	655	delete File;
	656	File = 0;
	657
	658	Fail();
	659	RotateDNS();
	660	Server->Close();
	661	break;
	662	}
	663
	664	// We need to flush the data, the header is like a 404 w/ error text
	665	case ERROR_WITH_CONTENT_PAGE:
	666	{
	667	Fail();
	668
	669	// Send to content to dev/null
	670	File = new FileFd("/dev/null",FileFd::WriteExists);
	671	Server->RunData(File);
	672	delete File;
	673	File = 0;
	674	break;
	675	}
	676
	677	// Try again with a new URL
	678	case TRY_AGAIN_OR_REDIRECT:
	679	{
	680	// Clear rest of response if there is content
	681	if (Server->HaveContent)
	682	{
	683	File = new FileFd("/dev/null",FileFd::WriteExists);
	684	Server->RunData(File);
	685	delete File;
	686	File = 0;
	687	}
	688
	689	/* Detect redirect loops. No more redirects are allowed
	690	after the same URI is seen twice in a queue item. */
	691	StringVector &R = Redirected[Queue->DestFile];
	692	bool StopRedirects = false;
	693	if (R.empty() == true)
	694	R.push_back(Queue->Uri);
	695	else if (R[0] == "STOP" \|\| R.size() > 10)
	696	StopRedirects = true;
	697	else
698	{
699	for (StringVectorIterator I = R.begin(); I != R.end(); ++I)
700	if (Queue->Uri == *I)
701	{
702	R[0] = "STOP";
703	break;
704	}
705
706	R.push_back(Queue->Uri);
707	}
708
709	if (StopRedirects == false)
710	Redirect(NextURI);
711	else
712	Fail();
713
714	break;
715	}
716
717	default:
718	Fail(_("Internal error"));
719	break;
720	}
721
722	FailCounter = 0;
723	}
724
725	return 0;
f2b47ba2 MV	726	}
	727	/}}}/
	728	/{{{/
	729	unsigned long long
	730	ServerMethod::FindMaximumObjectSizeInQueue() const
	731	{
	732	unsigned long long MaxSizeInQueue = 0;
8bb043fc	733	for (FetchItem *I = Queue; I != 0 && I != QueueBack; I = I->Next)
f2b47ba2 MV	734	MaxSizeInQueue = std::max(MaxSizeInQueue, I->MaximumSize);
f2b47ba2 MV	735	return MaxSizeInQueue;
7330f4df DK	736	}
7330f4df DK	737	/}}}/