[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/fileutl.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/netrc.h>

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <climits>
#include <iostream>
#include <map>

// Internet stuff
#include <netdb.h>

#include "config.h"
#include "connect.h"
#include "rfc2553emu.h"
#include "http.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 persistance 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 persistance
         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 neccessary 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
	13	#include <apt-pkg/fileutl.h>
	14	#include <apt-pkg/acquire-method.h>
	15	#include <apt-pkg/configuration.h>
	16	#include <apt-pkg/error.h>
	17	#include <apt-pkg/hashes.h>
	18	#include <apt-pkg/netrc.h>
	19
9ce3cfc9	20	#include <fcntl.h>
7330f4df DK	21	#include <sys/stat.h>
7330f4df DK	22	#include <sys/time.h>
7330f4df DK	23	#include <unistd.h>
	24	#include <signal.h>
	25	#include <stdio.h>
	26	#include <errno.h>
	27	#include <string.h>
	28	#include <climits>
	29	#include <iostream>
	30	#include <map>
	31
	32	// Internet stuff
	33	#include <netdb.h>
	34
	35	#include "config.h"
	36	#include "connect.h"
	37	#include "rfc2553emu.h"
	38	#include "http.h"
	39
	40	#include <apti18n.h>
	41	/}}}/
	42	using namespace std;
	43
	44	string ServerMethod::FailFile;
	45	int ServerMethod::FailFd = -1;
	46	time_t ServerMethod::FailTime = 0;
	47
	48	// ServerState::RunHeaders - Get the headers before the data /{{{/
	49	// ---------------------------------------------------------------------
	50	/* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header
	51	parse error occurred */
	52	ServerState::RunHeadersResult ServerState::RunHeaders(FileFd * const File)
	53	{
	54	State = Header;
	55
	56	Owner->Status(_("Waiting for headers"));
	57
	58	Major = 0;
	59	Minor = 0;
	60	Result = 0;
	61	Size = 0;
	62	StartPos = 0;
	63	Encoding = Closes;
	64	HaveContent = false;
	65	time(&Date);
	66
	67	do
	68	{
	69	string Data;
	70	if (ReadHeaderLines(Data) == false)
	71	continue;
	72
	73	if (Owner->Debug == true)
	74	clog << Data;
	75
	76	for (string::const_iterator I = Data.begin(); I < Data.end(); ++I)
	77	{
	78	string::const_iterator J = I;
	79	for (; J != Data.end() && J != '\n' && J != '\r'; ++J);
	80	if (HeaderLine(string(I,J)) == false)
	81	return RUN_HEADERS_PARSE_ERROR;
	82	I = J;
	83	}
	84
	85	// 100 Continue is a Nop...
	86	if (Result == 100)
87	continue;
88
89	// Tidy up the connection persistance state.
90	if (Encoding == Closes && HaveContent == true)
91	Persistent = false;
92
93	return RUN_HEADERS_OK;
94	}
95	while (LoadNextResponse(false, File) == true);
96
97	return RUN_HEADERS_IO_ERROR;
98	}
99	/}}}/
100	// ServerState::HeaderLine - Process a header line /{{{/
101	// ---------------------------------------------------------------------
102	/* */
103	bool ServerState::HeaderLine(string Line)
104	{
105	if (Line.empty() == true)
106	return true;
107
108	string::size_type Pos = Line.find(' ');
109	if (Pos == string::npos \|\| Pos+1 > Line.length())
110	{
111	// Blah, some servers use "connection:closes", evil.
112	Pos = Line.find(':');
113	if (Pos == string::npos \|\| Pos + 2 > Line.length())
114	return _error->Error(_("Bad header line"));
115	Pos++;
116	}
117
118	// Parse off any trailing spaces between the : and the next word.
119	string::size_type Pos2 = Pos;
120	while (Pos2 < Line.length() && isspace(Line[Pos2]) != 0)
121	Pos2++;
122
123	string Tag = string(Line,0,Pos);
124	string Val = string(Line,Pos2);
125
126	if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0)
127	{
128	// Evil servers return no version
129	if (Line[4] == '/')
130	{
131	int const elements = sscanf(Line.c_str(),"HTTP/%3u.%3u %3u%359[^\n]",&Major,&Minor,&Result,Code);
132	if (elements == 3)
133	{
134	Code[0] = '\0';
135	if (Owner->Debug == true)
136	clog << "HTTP server doesn't give Reason-Phrase for " << Result << std::endl;
137	}
138	else if (elements != 4)
139	return _error->Error(_("The HTTP server sent an invalid reply header"));
140	}
141	else
142	{
143	Major = 0;
144	Minor = 9;
145	if (sscanf(Line.c_str(),"HTTP %3u%359[^\n]",&Result,Code) != 2)
146	return _error->Error(_("The HTTP server sent an invalid reply header"));
147	}
148
149	/* Check the HTTP response header to get the default persistance
150	state. */
151	if (Major < 1)
152	Persistent = false;
153	else
154	{
155	if (Major == 1 && Minor == 0)
156	Persistent = false;
157	else
158	Persistent = true;
159	}
160
161	return true;
162	}
163
164	if (stringcasecmp(Tag,"Content-Length:") == 0)
165	{
166	if (Encoding == Closes)
167	Encoding = Stream;
168	HaveContent = true;
169
170	// The length is already set from the Content-Range header
171	if (StartPos != 0)
172	return true;
173
174	Size = strtoull(Val.c_str(), NULL, 10);
175	if (Size >= std::numeric_limits<unsigned long long>::max())
176	return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
177	else if (Size == 0)
178	HaveContent = false;
179	return true;
180	}
181
182	if (stringcasecmp(Tag,"Content-Type:") == 0)
183	{
184	HaveContent = true;
185	return true;
186	}
187
188	if (stringcasecmp(Tag,"Content-Range:") == 0)
189	{
190	HaveContent = true;
191
192	// §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
193	if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&Size) == 1)
194	{
195	StartPos = 1; // ignore Content-Length, it would override Size
196	HaveContent = false;
197	}
198	else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&Size) != 2)
199	return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
200	if ((unsigned long long)StartPos > Size)
201	return _error->Error(_("This HTTP server has broken range support"));
202	return true;
203	}
204
205	if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
206	{
207	HaveContent = true;
208	if (stringcasecmp(Val,"chunked") == 0)
209	Encoding = Chunked;
210	return true;
211	}
212
213	if (stringcasecmp(Tag,"Connection:") == 0)
214	{
215	if (stringcasecmp(Val,"close") == 0)
216	Persistent = false;
217	if (stringcasecmp(Val,"keep-alive") == 0)
218	Persistent = true;
219	return true;
220	}
221
222	if (stringcasecmp(Tag,"Last-Modified:") == 0)
223	{
224	if (RFC1123StrToTime(Val.c_str(), Date) == false)
225	return _error->Error(_("Unknown date format"));
226	return true;
227	}
228
229	if (stringcasecmp(Tag,"Location:") == 0)
230	{
231	Location = Val;
232	return true;
233	}
234
235	return true;
236	}
237	/}}}/
238	// ServerState::ServerState - Constructor /{{{/
239	ServerState::ServerState(URI Srv, ServerMethod *Owner) : ServerName(Srv), TimeOut(120), Owner(Owner)
240	{
241	Reset();
242	}
243	/}}}/
244
245	bool ServerMethod::Configuration(string Message) /{{{/
246	{
247	return pkgAcqMethod::Configuration(Message);
248	}
249	/}}}/
250
251	// ServerMethod::DealWithHeaders - Handle the retrieved header data /{{{/
252	// ---------------------------------------------------------------------
253	/* We look at the header data we got back from the server and decide what
254	to do. Returns DealWithHeadersResult (see http.h for details).
255	*/
256	ServerMethod::DealWithHeadersResult
257	ServerMethod::DealWithHeaders(FetchResult &Res)
258	{
259	// Not Modified
260	if (Server->Result == 304)
261	{
262	unlink(Queue->DestFile.c_str());
263	Res.IMSHit = true;
264	Res.LastModified = Queue->LastModified;
265	return IMS_HIT;
266	}
267
268	/* Redirect
269	*
270	* Note that it is only OK for us to treat all redirection the same
271	* because we always use GET, not other HTTP methods. There are
272	* three redirection codes for which it is not appropriate that we
273	* redirect. Pass on those codes so the error handling kicks in.
274	*/
275	if (AllowRedirect
276	&& (Server->Result > 300 && Server->Result < 400)
277	&& (Server->Result != 300 // Multiple Choices
278	&& Server->Result != 304 // Not Modified
279	&& Server->Result != 306)) // (Not part of HTTP/1.1, reserved)
280	{
281	if (Server->Location.empty() == true);
282	else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
283	{
284	URI Uri = Queue->Uri;
285	if (Uri.Host.empty() == false)
286	NextURI = URI::SiteOnly(Uri);
287	else
288	NextURI.clear();
289	NextURI.append(DeQuoteString(Server->Location));
290	return TRY_AGAIN_OR_REDIRECT;
291	}
292	else
293	{
9082a1fc DK	294	NextURI = DeQuoteString(Server->Location);
	295	URI tmpURI = NextURI;
	296	URI Uri = Queue->Uri;
	297	// same protocol redirects are okay
	298	if (tmpURI.Access == Uri.Access)
	299	return TRY_AGAIN_OR_REDIRECT;
	300	// as well as http to https
	301	else if (Uri.Access == "http" && tmpURI.Access == "https")
	302	return TRY_AGAIN_OR_REDIRECT;
7330f4df DK	303	}
	304	/* else pass through for error message */
	305	}
	306	// retry after an invalid range response without partial data
	307	else if (Server->Result == 416)
	308	{
	309	struct stat SBuf;
	310	if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
	311	{
	312	if ((unsigned long long)SBuf.st_size == Server->Size)
	313	{
	314	// the file is completely downloaded, but was not moved
	315	Server->StartPos = Server->Size;
	316	Server->Result = 200;
	317	Server->HaveContent = false;
	318	}
	319	else if (unlink(Queue->DestFile.c_str()) == 0)
	320	{
	321	NextURI = Queue->Uri;
	322	return TRY_AGAIN_OR_REDIRECT;
	323	}
	324	}
	325	}
	326
	327	/* We have a reply we dont handle. This should indicate a perm server
	328	failure */
	329	if (Server->Result < 200 \|\| Server->Result >= 300)
	330	{
	331	char err[255];
	332	snprintf(err,sizeof(err)-1,"HttpError%i",Server->Result);
	333	SetFailReason(err);
	334	_error->Error("%u %s",Server->Result,Server->Code);
	335	if (Server->HaveContent == true)
	336	return ERROR_WITH_CONTENT_PAGE;
	337	return ERROR_UNRECOVERABLE;
	338	}
	339
	340	// This is some sort of 2xx 'data follows' reply
	341	Res.LastModified = Server->Date;
	342	Res.Size = Server->Size;
	343
	344	// Open the file
	345	delete File;
	346	File = new FileFd(Queue->DestFile,FileFd::WriteAny);
	347	if (_error->PendingError() == true)
	348	return ERROR_NOT_FROM_SERVER;
	349
	350	FailFile = Queue->DestFile;
	351	FailFile.c_str(); // Make sure we dont do a malloc in the signal handler
	352	FailFd = File->Fd();
	353	FailTime = Server->Date;
	354
	355	if (Server->InitHashes(*File) == false)
	356	{
	357	_error->Errno("read",_("Problem hashing file"));
	358	return ERROR_NOT_FROM_SERVER;
	359	}
	360	if (Server->StartPos > 0)
	361	Res.ResumePoint = Server->StartPos;
	362
	363	SetNonBlock(File->Fd(),true);
	364	return FILE_IS_OPEN;
	365	}
	366	/}}}/
367	// ServerMethod::SigTerm - Handle a fatal signal /{{{/
368	// ---------------------------------------------------------------------
369	/* This closes and timestamps the open file. This is neccessary to get
370	resume behavoir on user abort */
371	void ServerMethod::SigTerm(int)
372	{
373	if (FailFd == -1)
374	_exit(100);
9ce3cfc9	375
246bbb61	376	struct timeval times[2];
9ce3cfc9 DK	377	times[0].tv_sec = FailTime;
9ce3cfc9 DK	378	times[1].tv_sec = FailTime;
246bbb61 DK	379	times[0].tv_usec = times[1].tv_usec = 0;
246bbb61 DK	380	utimes(FailFile.c_str(), times);
7330f4df	381	close(FailFd);
9ce3cfc9	382
7330f4df DK	383	_exit(100);
	384	}
	385	/}}}/
	386	// ServerMethod::Fetch - Fetch an item /{{{/
	387	// ---------------------------------------------------------------------
	388	/* This adds an item to the pipeline. We keep the pipeline at a fixed
	389	depth. */
	390	bool ServerMethod::Fetch(FetchItem *)
	391	{
	392	if (Server == 0)
	393	return true;
	394
	395	// Queue the requests
	396	int Depth = -1;
	397	for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
	398	I = I->Next, Depth++)
	399	{
	400	// If pipelining is disabled, we only queue 1 request
	401	if (Server->Pipeline == false && Depth >= 0)
	402	break;
	403
	404	// Make sure we stick with the same server
	405	if (Server->Comp(I->Uri) == false)
	406	break;
	407	if (QueueBack == I)
	408	{
	409	QueueBack = I->Next;
	410	SendReq(I);
	411	continue;
	412	}
	413	}
	414
	415	return true;
	416	};
	417	/}}}/
	418	// ServerMethod::Loop - Main loop /{{{/
	419	int ServerMethod::Loop()
	420	{
	421	typedef vector<string> StringVector;
	422	typedef vector<string>::iterator StringVectorIterator;
	423	map<string, StringVector> Redirected;
	424
	425	signal(SIGTERM,SigTerm);
	426	signal(SIGINT,SigTerm);
	427
	428	Server = 0;
	429
	430	int FailCounter = 0;
	431	while (1)
	432	{
	433	// We have no commands, wait for some to arrive
	434	if (Queue == 0)
	435	{
	436	if (WaitFd(STDIN_FILENO) == false)
	437	return 0;
	438	}
	439
	440	/* Run messages, we can accept 0 (no message) if we didn't
	441	do a WaitFd above.. Otherwise the FD is closed. */
	442	int Result = Run(true);
	443	if (Result != -1 && (Result != 0 \|\| Queue == 0))
	444	{
	445	if(FailReason.empty() == false \|\|
	446	_config->FindB("Acquire::http::DependOnSTDIN", true) == true)
447	return 100;
448	else
449	return 0;
450	}
451
452	if (Queue == 0)
453	continue;
454
455	// Connect to the server
456	if (Server == 0 \|\| Server->Comp(Queue->Uri) == false)
457	{
458	delete Server;
459	Server = CreateServerState(Queue->Uri);
460	}
461	/* If the server has explicitly said this is the last connection
462	then we pre-emptively shut down the pipeline and tear down
463	the connection. This will speed up HTTP/1.0 servers a tad
464	since we don't have to wait for the close sequence to
465	complete */
466	if (Server->Persistent == false)
467	Server->Close();
468
469	// Reset the pipeline
470	if (Server->IsOpen() == false)
471	QueueBack = Queue;
472
473	// Connnect to the host
474	if (Server->Open() == false)
475	{
476	Fail(true);
477	delete Server;
478	Server = 0;
479	continue;
480	}
481
482	// Fill the pipeline.
483	Fetch(0);
484
485	// Fetch the next URL header data from the server.
486	switch (Server->RunHeaders(File))
487	{
488	case ServerState::RUN_HEADERS_OK:
489	break;
490
491	// The header data is bad
492	case ServerState::RUN_HEADERS_PARSE_ERROR:
493	{
494	_error->Error(_("Bad header data"));
495	Fail(true);
496	RotateDNS();
497	continue;
498	}
499
500	// The server closed a connection during the header get..
501	default:
502	case ServerState::RUN_HEADERS_IO_ERROR:
503	{
504	FailCounter++;
505	_error->Discard();
506	Server->Close();
507	Server->Pipeline = false;
508
509	if (FailCounter >= 2)
510	{
511	Fail(_("Connection failed"),true);
512	FailCounter = 0;
513	}
514
515	RotateDNS();
516	continue;
517	}
518	};
519
520	// Decide what to do.
521	FetchResult Res;
522	Res.Filename = Queue->DestFile;
523	switch (DealWithHeaders(Res))
524	{
525	// Ok, the file is Open
526	case FILE_IS_OPEN:
527	{
528	URIStart(Res);
529
530	// Run the data
531	bool Result = true;
532	if (Server->HaveContent)
533	Result = Server->RunData(File);
534
535	/* If the server is sending back sizeless responses then fill in
536	the size now */
537	if (Res.Size == 0)
538	Res.Size = File->Size();
539
540	// Close the file, destroy the FD object and timestamp it
541	FailFd = -1;
542	delete File;
543	File = 0;
544
545	// Timestamp
246bbb61	546	struct timeval times[2];
9ce3cfc9	547	times[0].tv_sec = times[1].tv_sec = Server->Date;
246bbb61 DK	548	times[0].tv_usec = times[1].tv_usec = 0;
246bbb61 DK	549	utimes(Queue->DestFile.c_str(), times);
7330f4df DK	550
	551	// Send status to APT
	552	if (Result == true)
	553	{
	554	Res.TakeHashes(*Server->GetHashes());
	555	URIDone(Res);
	556	}
	557	else
	558	{
	559	if (Server->IsOpen() == false)
	560	{
	561	FailCounter++;
	562	_error->Discard();
	563	Server->Close();
	564
	565	if (FailCounter >= 2)
	566	{
	567	Fail(_("Connection failed"),true);
	568	FailCounter = 0;
	569	}
	570
	571	QueueBack = Queue;
	572	}
	573	else
	574	Fail(true);
	575	}
	576	break;
	577	}
	578
	579	// IMS hit
	580	case IMS_HIT:
	581	{
	582	URIDone(Res);
	583	break;
	584	}
	585
	586	// Hard server error, not found or something
	587	case ERROR_UNRECOVERABLE:
	588	{
	589	Fail();
	590	break;
	591	}
	592
	593	// Hard internal error, kill the connection and fail
	594	case ERROR_NOT_FROM_SERVER:
	595	{
	596	delete File;
	597	File = 0;
	598
	599	Fail();
	600	RotateDNS();
	601	Server->Close();
	602	break;
	603	}
	604
	605	// We need to flush the data, the header is like a 404 w/ error text
	606	case ERROR_WITH_CONTENT_PAGE:
	607	{
	608	Fail();
	609
	610	// Send to content to dev/null
	611	File = new FileFd("/dev/null",FileFd::WriteExists);
	612	Server->RunData(File);
	613	delete File;
614	File = 0;
615	break;
616	}
617
618	// Try again with a new URL
619	case TRY_AGAIN_OR_REDIRECT:
620	{
621	// Clear rest of response if there is content
622	if (Server->HaveContent)
623	{
624	File = new FileFd("/dev/null",FileFd::WriteExists);
625	Server->RunData(File);
626	delete File;
627	File = 0;
628	}
629
630	/* Detect redirect loops. No more redirects are allowed
631	after the same URI is seen twice in a queue item. */
632	StringVector &R = Redirected[Queue->DestFile];
633	bool StopRedirects = false;
634	if (R.empty() == true)
635	R.push_back(Queue->Uri);
636	else if (R[0] == "STOP" \|\| R.size() > 10)
637	StopRedirects = true;
638	else
639	{
640	for (StringVectorIterator I = R.begin(); I != R.end(); ++I)
641	if (Queue->Uri == *I)
642	{
643	R[0] = "STOP";
644	break;
645	}
646
647	R.push_back(Queue->Uri);
648	}
649
650	if (StopRedirects == false)
651	Redirect(NextURI);
652	else
653	Fail();
654
655	break;
656	}
657
658	default:
659	Fail(_("Internal error"));
660	break;
661	}
662
663	FailCounter = 0;
664	}
665
666	return 0;
667	}
668	/}}}/