[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; 
   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->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;

      // The length is already set from the Content-Range header
      if (StartPos != 0)
	 return true;

      Size = strtoull(Val.c_str(), NULL, 10);
      if (Size >= std::numeric_limits<unsigned long long>::max())
	 return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
      else if (Size == 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)
      {
	 StartPos = 1; // ignore Content-Length, it would override Size
	 HaveContent = false;
      }
      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 ServerMethod::Configuration(string Message)			/*{{{*/
{
   return pkgAcqMethod::Configuration(Message);
}
									/*}}}*/

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