[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; 
   TotalFileSize = 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 * DownloadSizePtr = &DownloadSize;
      if (Result == 416)
	 DownloadSizePtr = &JunkSize;

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

      // On partial content (206) the Content-Length less than the real
      // size, so do not set it here but leave that to the Content-Range
      // header instead
      if(Result != 206 && TotalFileSize == 0)
         TotalFileSize = DownloadSize;

      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",&TotalFileSize) == 1)
	 ; // we got the expected filesize which is all we wanted
      else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&TotalFileSize) != 2)
	 return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
      if ((unsigned long long)StartPos > TotalFileSize)
	 return _error->Error(_("This HTTP server has broken range support"));

      // figure out what we will download
      DownloadSize = TotalFileSize - StartPos;
      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->TotalFileSize)
	 {
	    // 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->TotalFileSize;
	    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)
   {
      char err[255];
      snprintf(err,sizeof(err)-1,"HttpError%i",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->TotalFileSize;
   
   // 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 pipelining is disabled, we only queue 1 request
      if (Server->Pipeline == false && Depth >= 0)
	 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;
            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)
	    {
	       Res.TakeHashes(*Server->GetHashes());
	       URIDone(Res);
	    }
	    else
	    {
	       if (Server->IsOpen() == false)
	       {
		  FailCounter++;
		  _error->Discard();
		  Server->Close();
		  
		  if (FailCounter >= 2)
		  {
		     Fail(_("Connection failed"),true);
		     FailCounter = 0;
		  }
		  
		  QueueBack = Queue;
	       }
	       else
		  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;
}
									/*}}}*/
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;
6291f60e	57	TotalFileSize = 0;
92e8c1ff	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
ceafe8a6	167	unsigned long long * DownloadSizePtr = &DownloadSize;
92e8c1ff	168	if (Result == 416)
ceafe8a6	169	DownloadSizePtr = &JunkSize;
7330f4df	170
ceafe8a6 MV	171	*DownloadSizePtr = strtoull(Val.c_str(), NULL, 10);
ceafe8a6 MV	172	if (*DownloadSizePtr >= std::numeric_limits<unsigned long long>::max())
7330f4df	173	return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
ceafe8a6	174	else if (*DownloadSizePtr == 0)
7330f4df	175	HaveContent = false;
ceafe8a6 MV	176
	177	// On partial content (206) the Content-Length less than the real
	178	// size, so do not set it here but leave that to the Content-Range
	179	// header instead
6291f60e MV	180	if(Result != 206 && TotalFileSize == 0)
6291f60e MV	181	TotalFileSize = DownloadSize;
ceafe8a6	182
7330f4df DK	183	return true;
	184	}
	185
	186	if (stringcasecmp(Tag,"Content-Type:") == 0)
	187	{
	188	HaveContent = true;
	189	return true;
	190	}
d3e8fbb3	191
7330f4df DK	192	if (stringcasecmp(Tag,"Content-Range:") == 0)
	193	{
	194	HaveContent = true;
	195
	196	// §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
6291f60e	197	if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&TotalFileSize) == 1)
92e8c1ff	198	; // we got the expected filesize which is all we wanted
6291f60e	199	else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&TotalFileSize) != 2)
7330f4df	200	return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
6291f60e	201	if ((unsigned long long)StartPos > TotalFileSize)
7330f4df	202	return _error->Error(_("This HTTP server has broken range support"));
ceafe8a6 MV	203
ceafe8a6 MV	204	// figure out what we will download
6291f60e	205	DownloadSize = TotalFileSize - StartPos;
7330f4df DK	206	return true;
7330f4df DK	207	}
d3e8fbb3	208
7330f4df DK	209	if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
	210	{
	211	HaveContent = true;
	212	if (stringcasecmp(Val,"chunked") == 0)
d3e8fbb3	213	Encoding = Chunked;
7330f4df DK	214	return true;
	215	}
	216
	217	if (stringcasecmp(Tag,"Connection:") == 0)
	218	{
	219	if (stringcasecmp(Val,"close") == 0)
	220	Persistent = false;
	221	if (stringcasecmp(Val,"keep-alive") == 0)
	222	Persistent = true;
	223	return true;
	224	}
d3e8fbb3	225
7330f4df DK	226	if (stringcasecmp(Tag,"Last-Modified:") == 0)
	227	{
	228	if (RFC1123StrToTime(Val.c_str(), Date) == false)
	229	return _error->Error(_("Unknown date format"));
	230	return true;
	231	}
	232
	233	if (stringcasecmp(Tag,"Location:") == 0)
	234	{
	235	Location = Val;
	236	return true;
	237	}
	238
	239	return true;
	240	}
	241	/}}}/
	242	// ServerState::ServerState - Constructor /{{{/
	243	ServerState::ServerState(URI Srv, ServerMethod *Owner) : ServerName(Srv), TimeOut(120), Owner(Owner)
	244	{
	245	Reset();
	246	}
	247	/}}}/
	248
	249	bool ServerMethod::Configuration(string Message) /{{{/
	250	{
	251	return pkgAcqMethod::Configuration(Message);
	252	}
	253	/}}}/
	254
	255	// ServerMethod::DealWithHeaders - Handle the retrieved header data /{{{/
	256	// ---------------------------------------------------------------------
	257	/* We look at the header data we got back from the server and decide what
	258	to do. Returns DealWithHeadersResult (see http.h for details).
	259	*/
	260	ServerMethod::DealWithHeadersResult
	261	ServerMethod::DealWithHeaders(FetchResult &Res)
	262	{
	263	// Not Modified
	264	if (Server->Result == 304)
	265	{
	266	unlink(Queue->DestFile.c_str());
	267	Res.IMSHit = true;
	268	Res.LastModified = Queue->LastModified;
	269	return IMS_HIT;
	270	}
	271
	272	/* Redirect
	273	*
	274	* Note that it is only OK for us to treat all redirection the same
	275	* because we always use GET, not other HTTP methods. There are
	276	* three redirection codes for which it is not appropriate that we
	277	* redirect. Pass on those codes so the error handling kicks in.
	278	*/
	279	if (AllowRedirect
	280	&& (Server->Result > 300 && Server->Result < 400)
	281	&& (Server->Result != 300 // Multiple Choices
	282	&& Server->Result != 304 // Not Modified
	283	&& Server->Result != 306)) // (Not part of HTTP/1.1, reserved)
	284	{
	285	if (Server->Location.empty() == true);
	286	else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
	287	{
	288	URI Uri = Queue->Uri;
	289	if (Uri.Host.empty() == false)
290	NextURI = URI::SiteOnly(Uri);
291	else
292	NextURI.clear();
293	NextURI.append(DeQuoteString(Server->Location));
294	return TRY_AGAIN_OR_REDIRECT;
295	}
296	else
297	{
9082a1fc DK	298	NextURI = DeQuoteString(Server->Location);
	299	URI tmpURI = NextURI;
	300	URI Uri = Queue->Uri;
	301	// same protocol redirects are okay
	302	if (tmpURI.Access == Uri.Access)
	303	return TRY_AGAIN_OR_REDIRECT;
	304	// as well as http to https
	305	else if (Uri.Access == "http" && tmpURI.Access == "https")
	306	return TRY_AGAIN_OR_REDIRECT;
7330f4df DK	307	}
	308	/* else pass through for error message */
	309	}
	310	// retry after an invalid range response without partial data
	311	else if (Server->Result == 416)
	312	{
	313	struct stat SBuf;
	314	if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
	315	{
6291f60e	316	if ((unsigned long long)SBuf.st_size == Server->TotalFileSize)
7330f4df DK	317	{
7330f4df DK	318	// the file is completely downloaded, but was not moved
92e8c1ff DK	319	if (Server->HaveContent == true)
	320	{
	321	// Send to error page to dev/null
	322	FileFd DevNull("/dev/null",FileFd::WriteExists);
	323	Server->RunData(&DevNull);
	324	}
	325	Server->HaveContent = false;
6291f60e	326	Server->StartPos = Server->TotalFileSize;
7330f4df	327	Server->Result = 200;
7330f4df DK	328	}
	329	else if (unlink(Queue->DestFile.c_str()) == 0)
	330	{
	331	NextURI = Queue->Uri;
	332	return TRY_AGAIN_OR_REDIRECT;
	333	}
	334	}
	335	}
	336
	337	/* We have a reply we dont handle. This should indicate a perm server
	338	failure */
	339	if (Server->Result < 200 \|\| Server->Result >= 300)
	340	{
	341	char err[255];
	342	snprintf(err,sizeof(err)-1,"HttpError%i",Server->Result);
	343	SetFailReason(err);
	344	_error->Error("%u %s",Server->Result,Server->Code);
	345	if (Server->HaveContent == true)
	346	return ERROR_WITH_CONTENT_PAGE;
	347	return ERROR_UNRECOVERABLE;
	348	}
	349
	350	// This is some sort of 2xx 'data follows' reply
	351	Res.LastModified = Server->Date;
6291f60e	352	Res.Size = Server->TotalFileSize;
7330f4df DK	353
	354	// Open the file
	355	delete File;
	356	File = new FileFd(Queue->DestFile,FileFd::WriteAny);
	357	if (_error->PendingError() == true)
	358	return ERROR_NOT_FROM_SERVER;
	359
	360	FailFile = Queue->DestFile;
	361	FailFile.c_str(); // Make sure we dont do a malloc in the signal handler
	362	FailFd = File->Fd();
	363	FailTime = Server->Date;
	364
	365	if (Server->InitHashes(*File) == false)
	366	{
	367	_error->Errno("read",_("Problem hashing file"));
	368	return ERROR_NOT_FROM_SERVER;
	369	}
	370	if (Server->StartPos > 0)
	371	Res.ResumePoint = Server->StartPos;
	372
	373	SetNonBlock(File->Fd(),true);
	374	return FILE_IS_OPEN;
	375	}
	376	/}}}/
	377	// ServerMethod::SigTerm - Handle a fatal signal /{{{/
	378	// ---------------------------------------------------------------------
1e3f4083	379	/* This closes and timestamps the open file. This is necessary to get
7330f4df DK	380	resume behavoir on user abort */
	381	void ServerMethod::SigTerm(int)
	382	{
	383	if (FailFd == -1)
	384	_exit(100);
9ce3cfc9	385
246bbb61	386	struct timeval times[2];
9ce3cfc9 DK	387	times[0].tv_sec = FailTime;
9ce3cfc9 DK	388	times[1].tv_sec = FailTime;
246bbb61 DK	389	times[0].tv_usec = times[1].tv_usec = 0;
246bbb61 DK	390	utimes(FailFile.c_str(), times);
7330f4df	391	close(FailFd);
9ce3cfc9	392
7330f4df DK	393	_exit(100);
	394	}
	395	/}}}/
	396	// ServerMethod::Fetch - Fetch an item /{{{/
	397	// ---------------------------------------------------------------------
	398	/* This adds an item to the pipeline. We keep the pipeline at a fixed
	399	depth. */
	400	bool ServerMethod::Fetch(FetchItem *)
	401	{
	402	if (Server == 0)
	403	return true;
	404
	405	// Queue the requests
	406	int Depth = -1;
	407	for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
	408	I = I->Next, Depth++)
	409	{
	410	// If pipelining is disabled, we only queue 1 request
	411	if (Server->Pipeline == false && Depth >= 0)
	412	break;
	413
	414	// Make sure we stick with the same server
	415	if (Server->Comp(I->Uri) == false)
	416	break;
	417	if (QueueBack == I)
	418	{
	419	QueueBack = I->Next;
	420	SendReq(I);
	421	continue;
	422	}
	423	}
	424
	425	return true;
d3e8fbb3	426	}
7330f4df DK	427	/}}}/
	428	// ServerMethod::Loop - Main loop /{{{/
	429	int ServerMethod::Loop()
	430	{
	431	typedef vector<string> StringVector;
	432	typedef vector<string>::iterator StringVectorIterator;
	433	map<string, StringVector> Redirected;
	434
	435	signal(SIGTERM,SigTerm);
	436	signal(SIGINT,SigTerm);
	437
	438	Server = 0;
	439
	440	int FailCounter = 0;
	441	while (1)
	442	{
	443	// We have no commands, wait for some to arrive
	444	if (Queue == 0)
	445	{
	446	if (WaitFd(STDIN_FILENO) == false)
	447	return 0;
	448	}
	449
	450	/* Run messages, we can accept 0 (no message) if we didn't
	451	do a WaitFd above.. Otherwise the FD is closed. */
	452	int Result = Run(true);
	453	if (Result != -1 && (Result != 0 \|\| Queue == 0))
	454	{
	455	if(FailReason.empty() == false \|\|
	456	_config->FindB("Acquire::http::DependOnSTDIN", true) == true)
	457	return 100;
	458	else
	459	return 0;
	460	}
	461
	462	if (Queue == 0)
	463	continue;
	464
	465	// Connect to the server
	466	if (Server == 0 \|\| Server->Comp(Queue->Uri) == false)
	467	{
	468	delete Server;
	469	Server = CreateServerState(Queue->Uri);
	470	}
	471	/* If the server has explicitly said this is the last connection
	472	then we pre-emptively shut down the pipeline and tear down
	473	the connection. This will speed up HTTP/1.0 servers a tad
	474	since we don't have to wait for the close sequence to
	475	complete */
	476	if (Server->Persistent == false)
	477	Server->Close();
	478
	479	// Reset the pipeline
	480	if (Server->IsOpen() == false)
	481	QueueBack = Queue;
	482
	483	// Connnect to the host
	484	if (Server->Open() == false)
	485	{
	486	Fail(true);
	487	delete Server;
	488	Server = 0;
	489	continue;
	490	}
491
492	// Fill the pipeline.
493	Fetch(0);
494
495	// Fetch the next URL header data from the server.
9622b211	496	switch (Server->RunHeaders(File, Queue->Uri))
7330f4df DK	497	{
	498	case ServerState::RUN_HEADERS_OK:
	499	break;
	500
	501	// The header data is bad
	502	case ServerState::RUN_HEADERS_PARSE_ERROR:
	503	{
	504	_error->Error(_("Bad header data"));
	505	Fail(true);
	506	RotateDNS();
	507	continue;
	508	}
	509
	510	// The server closed a connection during the header get..
	511	default:
	512	case ServerState::RUN_HEADERS_IO_ERROR:
	513	{
	514	FailCounter++;
	515	_error->Discard();
	516	Server->Close();
	517	Server->Pipeline = false;
	518
	519	if (FailCounter >= 2)
	520	{
	521	Fail(_("Connection failed"),true);
	522	FailCounter = 0;
	523	}
	524
	525	RotateDNS();
	526	continue;
	527	}
	528	};
	529
	530	// Decide what to do.
	531	FetchResult Res;
	532	Res.Filename = Queue->DestFile;
	533	switch (DealWithHeaders(Res))
	534	{
	535	// Ok, the file is Open
	536	case FILE_IS_OPEN:
	537	{
	538	URIStart(Res);
	539
	540	// Run the data
	541	bool Result = true;
	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	{
	564	Res.TakeHashes(*Server->GetHashes());
	565	URIDone(Res);
	566	}
	567	else
	568	{
	569	if (Server->IsOpen() == false)
	570	{
	571	FailCounter++;
	572	_error->Discard();
	573	Server->Close();
	574
	575	if (FailCounter >= 2)
	576	{
	577	Fail(_("Connection failed"),true);
	578	FailCounter = 0;
	579	}
	580
	581	QueueBack = Queue;
	582	}
	583	else
	584	Fail(true);
	585	}
	586	break;
	587	}
	588
	589	// IMS hit
	590	case IMS_HIT:
	591	{
	592	URIDone(Res);
	593	break;
	594	}
	595
	596	// Hard server error, not found or something
	597	case ERROR_UNRECOVERABLE:
	598	{
	599	Fail();
	600	break;
	601	}
	602
	603	// Hard internal error, kill the connection and fail
	604	case ERROR_NOT_FROM_SERVER:
	605	{
	606	delete File;
	607	File = 0;
	608
	609	Fail();
	610	RotateDNS();
	611	Server->Close();
	612	break;
	613	}
	614
	615	// We need to flush the data, the header is like a 404 w/ error text
	616	case ERROR_WITH_CONTENT_PAGE:
	617	{
	618	Fail();
	619
	620	// Send to content to dev/null
	621	File = new FileFd("/dev/null",FileFd::WriteExists);
	622	Server->RunData(File);
	623	delete File;
624	File = 0;
625	break;
626	}
627
628	// Try again with a new URL
629	case TRY_AGAIN_OR_REDIRECT:
630	{
631	// Clear rest of response if there is content
632	if (Server->HaveContent)
633	{
634	File = new FileFd("/dev/null",FileFd::WriteExists);
635	Server->RunData(File);
636	delete File;
637	File = 0;
638	}
639
640	/* Detect redirect loops. No more redirects are allowed
641	after the same URI is seen twice in a queue item. */
642	StringVector &R = Redirected[Queue->DestFile];
643	bool StopRedirects = false;
644	if (R.empty() == true)
645	R.push_back(Queue->Uri);
646	else if (R[0] == "STOP" \|\| R.size() > 10)
647	StopRedirects = true;
648	else
649	{
650	for (StringVectorIterator I = R.begin(); I != R.end(); ++I)
651	if (Queue->Uri == *I)
652	{
653	R[0] = "STOP";
654	break;
655	}
656
657	R.push_back(Queue->Uri);
658	}
659
660	if (StopRedirects == false)
661	Redirect(NextURI);
662	else
663	Fail();
664
665	break;
666	}
667
668	default:
669	Fail(_("Internal error"));
670	break;
671	}
672
673	FailCounter = 0;
674	}
675
676	return 0;
677	}
678	/}}}/