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