methods/http.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: http.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
   4 /* ######################################################################
   5
   6    HTTP Acquire Method - This is the HTTP acquire method for APT.
   7
   8    It uses HTTP/1.1 and many of the fancy options there-in, such as
   9    pipelining, range, if-range and so on.
  10
  11    It is based on a doubly buffered select loop. A groupe of requests are
  12    fed into a single output buffer that is constantly fed out the
  13    socket. This provides ideal pipelining as in many cases all of the
  14    requests will fit into a single packet. The input socket is buffered
  15    the same way and fed into the fd for the file (may be a pipe in future).
  16
  17    This double buffering provides fairly substantial transfer rates,
  18    compared to wget the http method is about 4% faster. Most importantly,
  19    when HTTP is compared with FTP as a protocol the speed difference is
  20    huge. In tests over the internet from two sites to llug (via ATM) this
  21    program got 230k/s sustained http transfer rates. FTP on the other
  22    hand topped out at 170k/s. That combined with the time to setup the
  23    FTP connection makes HTTP a vastly superior protocol.
  24
  25    ##################################################################### */
  26                                                                         /*}}}*/
  27 // Include Files                                                        /*{{{*/
  28 #include <config.h>
  29
  30 #include <apt-pkg/fileutl.h>
  31 #include <apt-pkg/acquire-method.h>
  32 #include <apt-pkg/configuration.h>
  33 #include <apt-pkg/error.h>
  34 #include <apt-pkg/hashes.h>
  35 #include <apt-pkg/netrc.h>
  36 #include <apt-pkg/strutl.h>
  37
  38 #include <stddef.h>
  39 #include <stdlib.h>
  40 #include <sys/select.h>
  41 #include <cstring>
  42 #include <sys/stat.h>
  43 #include <sys/time.h>
  44 #include <unistd.h>
  45 #include <stdio.h>
  46 #include <errno.h>
  47 #include <iostream>
  48 #include <sstream>
  49
  50 #include "config.h"
  51 #include "connect.h"
  52 #include "http.h"
  53
  54 #include <apti18n.h>
  55                                                                         /*}}}*/
  56 using namespace std;
  57
  58 unsigned long long CircleBuf::BwReadLimit=0;
  59 unsigned long long CircleBuf::BwTickReadData=0;
  60 struct timeval CircleBuf::BwReadTick={0,0};
  61 const unsigned int CircleBuf::BW_HZ=10;
  62
  63 // CircleBuf::CircleBuf - Circular input buffer                         /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* */
  66 CircleBuf::CircleBuf(unsigned long long Size)
  67    : Size(Size), Hash(0), TotalWriten(0)
  68 {
  69    Buf = new unsigned char[Size];
  70    Reset();
  71
  72    CircleBuf::BwReadLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024;
  73 }
  74                                                                         /*}}}*/
  75 // CircleBuf::Reset - Reset to the default state                        /*{{{*/
  76 // ---------------------------------------------------------------------
  77 /* */
  78 void CircleBuf::Reset()
  79 {
  80    InP = 0;
  81    OutP = 0;
  82    StrPos = 0;
  83    TotalWriten = 0;
  84    MaxGet = (unsigned long long)-1;
  85    OutQueue = string();
  86    if (Hash != 0)
  87    {
  88       delete Hash;
  89       Hash = new Hashes;
  90    }
  91 }
  92                                                                         /*}}}*/
  93 // CircleBuf::Read - Read from a FD into the circular buffer            /*{{{*/
  94 // ---------------------------------------------------------------------
  95 /* This fills up the buffer with as much data as is in the FD, assuming it
  96    is non-blocking.. */
  97 bool CircleBuf::Read(int Fd)
  98 {
  99    while (1)
 100    {
 101       // Woops, buffer is full
 102       if (InP - OutP == Size)
 103          return true;
 104
 105       // what's left to read in this tick
 106       unsigned long long const BwReadMax = CircleBuf::BwReadLimit/BW_HZ;
 107
 108       if(CircleBuf::BwReadLimit) {
 109          struct timeval now;
 110          gettimeofday(&now,0);
 111
 112          unsigned long long d = (now.tv_sec-CircleBuf::BwReadTick.tv_sec)*1000000 +
 113             now.tv_usec-CircleBuf::BwReadTick.tv_usec;
 114          if(d > 1000000/BW_HZ) {
 115             CircleBuf::BwReadTick = now;
 116             CircleBuf::BwTickReadData = 0;
 117          }
 118
 119          if(CircleBuf::BwTickReadData >= BwReadMax) {
 120             usleep(1000000/BW_HZ);
 121             return true;
 122          }
 123       }
 124
 125       // Write the buffer segment
 126       ssize_t Res;
 127       if(CircleBuf::BwReadLimit) {
 128          Res = read(Fd,Buf + (InP%Size),
 129                     BwReadMax > LeftRead() ? LeftRead() : BwReadMax);
 130       } else
 131          Res = read(Fd,Buf + (InP%Size),LeftRead());
 132
 133       if(Res > 0 && BwReadLimit > 0)
 134          CircleBuf::BwTickReadData += Res;
 135
 136       if (Res == 0)
 137          return false;
 138       if (Res < 0)
 139       {
 140          if (errno == EAGAIN)
 141             return true;
 142          return false;
 143       }
 144
 145       if (InP == 0)
 146          gettimeofday(&Start,0);
 147       InP += Res;
 148    }
 149 }
 150                                                                         /*}}}*/
 151 // CircleBuf::Read - Put the string into the buffer                     /*{{{*/
 152 // ---------------------------------------------------------------------
 153 /* This will hold the string in and fill the buffer with it as it empties */
 154 bool CircleBuf::Read(string Data)
 155 {
 156    OutQueue += Data;
 157    FillOut();
 158    return true;
 159 }
 160                                                                         /*}}}*/
 161 // CircleBuf::FillOut - Fill the buffer from the output queue           /*{{{*/
 162 // ---------------------------------------------------------------------
 163 /* */
 164 void CircleBuf::FillOut()
 165 {
 166    if (OutQueue.empty() == true)
 167       return;
 168    while (1)
 169    {
 170       // Woops, buffer is full
 171       if (InP - OutP == Size)
 172          return;
 173
 174       // Write the buffer segment
 175       unsigned long long Sz = LeftRead();
 176       if (OutQueue.length() - StrPos < Sz)
 177          Sz = OutQueue.length() - StrPos;
 178       memcpy(Buf + (InP%Size),OutQueue.c_str() + StrPos,Sz);
 179
 180       // Advance
 181       StrPos += Sz;
 182       InP += Sz;
 183       if (OutQueue.length() == StrPos)
 184       {
 185          StrPos = 0;
 186          OutQueue = "";
 187          return;
 188       }
 189    }
 190 }
 191                                                                         /*}}}*/
 192 // CircleBuf::Write - Write from the buffer into a FD                   /*{{{*/
 193 // ---------------------------------------------------------------------
 194 /* This empties the buffer into the FD. */
 195 bool CircleBuf::Write(int Fd)
 196 {
 197    while (1)
 198    {
 199       FillOut();
 200
 201       // Woops, buffer is empty
 202       if (OutP == InP)
 203          return true;
 204
 205       if (OutP == MaxGet)
 206          return true;
 207
 208       // Write the buffer segment
 209       ssize_t Res;
 210       Res = write(Fd,Buf + (OutP%Size),LeftWrite());
 211
 212       if (Res == 0)
 213          return false;
 214       if (Res < 0)
 215       {
 216          if (errno == EAGAIN)
 217             return true;
 218
 219          return false;
 220       }
 221
 222       TotalWriten += Res;
 223
 224       if (Hash != 0)
 225          Hash->Add(Buf + (OutP%Size),Res);
 226
 227       OutP += Res;
 228    }
 229 }
 230                                                                         /*}}}*/
 231 // CircleBuf::WriteTillEl - Write from the buffer to a string           /*{{{*/
 232 // ---------------------------------------------------------------------
 233 /* This copies till the first empty line */
 234 bool CircleBuf::WriteTillEl(string &Data,bool Single)
 235 {
 236    // We cheat and assume it is unneeded to have more than one buffer load
 237    for (unsigned long long I = OutP; I < InP; I++)
 238    {
 239       if (Buf[I%Size] != '\n')
 240          continue;
 241       ++I;
 242
 243       if (Single == false)
 244       {
 245          if (I < InP  && Buf[I%Size] == '\r')
 246             ++I;
 247          if (I >= InP || Buf[I%Size] != '\n')
 248             continue;
 249          ++I;
 250       }
 251
 252       Data = "";
 253       while (OutP < I)
 254       {
 255          unsigned long long Sz = LeftWrite();
 256          if (Sz == 0)
 257             return false;
 258          if (I - OutP < Sz)
 259             Sz = I - OutP;
 260          Data += string((char *)(Buf + (OutP%Size)),Sz);
 261          OutP += Sz;
 262       }
 263       return true;
 264    }
 265    return false;
 266 }
 267                                                                         /*}}}*/
 268 // CircleBuf::Stats - Print out stats information                       /*{{{*/
 269 // ---------------------------------------------------------------------
 270 /* */
 271 void CircleBuf::Stats()
 272 {
 273    if (InP == 0)
 274       return;
 275
 276    struct timeval Stop;
 277    gettimeofday(&Stop,0);
 278 /*   float Diff = Stop.tv_sec - Start.tv_sec +
 279              (float)(Stop.tv_usec - Start.tv_usec)/1000000;
 280    clog << "Got " << InP << " in " << Diff << " at " << InP/Diff << endl;*/
 281 }
 282                                                                         /*}}}*/
 283 CircleBuf::~CircleBuf()
 284 {
 285    delete [] Buf;
 286    delete Hash;
 287 }
 288
 289 // HttpServerState::HttpServerState - Constructor                       /*{{{*/
 290 HttpServerState::HttpServerState(URI Srv,HttpMethod *Owner) : ServerState(Srv, Owner), In(64*1024), Out(4*1024)
 291 {
 292    TimeOut = _config->FindI("Acquire::http::Timeout",TimeOut);
 293    Reset();
 294 }
 295                                                                         /*}}}*/
 296 // HttpServerState::Open - Open a connection to the server              /*{{{*/
 297 // ---------------------------------------------------------------------
 298 /* This opens a connection to the server. */
 299 bool HttpServerState::Open()
 300 {
 301    // Use the already open connection if possible.
 302    if (ServerFd != -1)
 303       return true;
 304
 305    Close();
 306    In.Reset();
 307    Out.Reset();
 308    Persistent = true;
 309
 310    // Determine the proxy setting
 311    string SpecificProxy = _config->Find("Acquire::http::Proxy::" + ServerName.Host);
 312    if (!SpecificProxy.empty())
 313    {
 314            if (SpecificProxy == "DIRECT")
 315                    Proxy = "";
 316            else
 317                    Proxy = SpecificProxy;
 318    }
 319    else
 320    {
 321            string DefProxy = _config->Find("Acquire::http::Proxy");
 322            if (!DefProxy.empty())
 323            {
 324                    Proxy = DefProxy;
 325            }
 326            else
 327            {
 328                    char* result = getenv("http_proxy");
 329                    Proxy = result ? result : "";
 330            }
 331    }
 332
 333    // Parse no_proxy, a , separated list of domains
 334    if (getenv("no_proxy") != 0)
 335    {
 336       if (CheckDomainList(ServerName.Host,getenv("no_proxy")) == true)
 337          Proxy = "";
 338    }
 339
 340    // Determine what host and port to use based on the proxy settings
 341    int Port = 0;
 342    string Host;
 343    if (Proxy.empty() == true || Proxy.Host.empty() == true)
 344    {
 345       if (ServerName.Port != 0)
 346          Port = ServerName.Port;
 347       Host = ServerName.Host;
 348    }
 349    else
 350    {
 351       if (Proxy.Port != 0)
 352          Port = Proxy.Port;
 353       Host = Proxy.Host;
 354    }
 355
 356    // Connect to the remote server
 357    if (Connect(Host,Port,"http",80,ServerFd,TimeOut,Owner) == false)
 358       return false;
 359
 360    return true;
 361 }
 362                                                                         /*}}}*/
 363 // HttpServerState::Close - Close a connection to the server            /*{{{*/
 364 // ---------------------------------------------------------------------
 365 /* */
 366 bool HttpServerState::Close()
 367 {
 368    close(ServerFd);
 369    ServerFd = -1;
 370    return true;
 371 }
 372                                                                         /*}}}*/
 373 // HttpServerState::RunData - Transfer the data from the socket         /*{{{*/
 374 bool HttpServerState::RunData(FileFd * const File)
 375 {
 376    State = Data;
 377
 378    // Chunked transfer encoding is fun..
 379    if (Encoding == Chunked)
 380    {
 381       while (1)
 382       {
 383          // Grab the block size
 384          bool Last = true;
 385          string Data;
 386          In.Limit(-1);
 387          do
 388          {
 389             if (In.WriteTillEl(Data,true) == true)
 390                break;
 391          }
 392          while ((Last = Go(false, File)) == true);
 393
 394          if (Last == false)
 395             return false;
 396
 397          // See if we are done
 398          unsigned long long Len = strtoull(Data.c_str(),0,16);
 399          if (Len == 0)
 400          {
 401             In.Limit(-1);
 402
 403             // We have to remove the entity trailer
 404             Last = true;
 405             do
 406             {
 407                if (In.WriteTillEl(Data,true) == true && Data.length() <= 2)
 408                   break;
 409             }
 410             while ((Last = Go(false, File)) == true);
 411             if (Last == false)
 412                return false;
 413             return !_error->PendingError();
 414          }
 415
 416          // Transfer the block
 417          In.Limit(Len);
 418          while (Go(true, File) == true)
 419             if (In.IsLimit() == true)
 420                break;
 421
 422          // Error
 423          if (In.IsLimit() == false)
 424             return false;
 425
 426          // The server sends an extra new line before the next block specifier..
 427          In.Limit(-1);
 428          Last = true;
 429          do
 430          {
 431             if (In.WriteTillEl(Data,true) == true)
 432                break;
 433          }
 434          while ((Last = Go(false, File)) == true);
 435          if (Last == false)
 436             return false;
 437       }
 438    }
 439    else
 440    {
 441       /* Closes encoding is used when the server did not specify a size, the
 442          loss of the connection means we are done */
 443       if (Encoding == Closes)
 444          In.Limit(-1);
 445       else
 446          In.Limit(Size - StartPos);
 447
 448       // Just transfer the whole block.
 449       do
 450       {
 451          if (In.IsLimit() == false)
 452             continue;
 453
 454          In.Limit(-1);
 455          return !_error->PendingError();
 456       }
 457       while (Go(true, File) == true);
 458    }
 459
 460    return Owner->Flush() && !_error->PendingError();
 461 }
 462                                                                         /*}}}*/
 463 bool HttpServerState::ReadHeaderLines(std::string &Data)                /*{{{*/
 464 {
 465    return In.WriteTillEl(Data);
 466 }
 467                                                                         /*}}}*/
 468 bool HttpServerState::LoadNextResponse(bool const ToFile, FileFd * const File)/*{{{*/
 469 {
 470    return Go(ToFile, File);
 471 }
 472                                                                         /*}}}*/
 473 bool HttpServerState::WriteResponse(const std::string &Data)            /*{{{*/
 474 {
 475    return Out.Read(Data);
 476 }
 477                                                                         /*}}}*/
 478 APT_PURE bool HttpServerState::IsOpen()                                 /*{{{*/
 479 {
 480    return (ServerFd != -1);
 481 }
 482                                                                         /*}}}*/
 483 bool HttpServerState::InitHashes(FileFd &File)                          /*{{{*/
 484 {
 485    delete In.Hash;
 486    In.Hash = new Hashes;
 487
 488    // Set the expected size and read file for the hashes
 489    File.Truncate(StartPos);
 490    return In.Hash->AddFD(File, StartPos);
 491 }
 492                                                                         /*}}}*/
 493 APT_PURE Hashes * HttpServerState::GetHashes()                          /*{{{*/
 494 {
 495    return In.Hash;
 496 }
 497                                                                         /*}}}*/
 498 // HttpServerState::Die - The server has closed the connection.         /*{{{*/
 499 bool HttpServerState::Die(FileFd &File)
 500 {
 501    unsigned int LErrno = errno;
 502
 503    // Dump the buffer to the file
 504    if (State == ServerState::Data)
 505    {
 506       // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking
 507       // can't be set
 508       if (File.Name() != "/dev/null")
 509          SetNonBlock(File.Fd(),false);
 510       while (In.WriteSpace() == true)
 511       {
 512          if (In.Write(File.Fd()) == false)
 513             return _error->Errno("write",_("Error writing to the file"));
 514
 515          // Done
 516          if (In.IsLimit() == true)
 517             return true;
 518       }
 519    }
 520
 521    // See if this is because the server finished the data stream
 522    if (In.IsLimit() == false && State != HttpServerState::Header &&
 523        Encoding != HttpServerState::Closes)
 524    {
 525       Close();
 526       if (LErrno == 0)
 527          return _error->Error(_("Error reading from server. Remote end closed connection"));
 528       errno = LErrno;
 529       return _error->Errno("read",_("Error reading from server"));
 530    }
 531    else
 532    {
 533       In.Limit(-1);
 534
 535       // Nothing left in the buffer
 536       if (In.WriteSpace() == false)
 537          return false;
 538
 539       // We may have got multiple responses back in one packet..
 540       Close();
 541       return true;
 542    }
 543
 544    return false;
 545 }
 546                                                                         /*}}}*/
 547 // HttpServerState::Flush - Dump the buffer into the file               /*{{{*/
 548 // ---------------------------------------------------------------------
 549 /* This takes the current input buffer from the Server FD and writes it
 550    into the file */
 551 bool HttpServerState::Flush(FileFd * const File)
 552 {
 553    if (File != NULL)
 554    {
 555       // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking
 556       // can't be set
 557       if (File->Name() != "/dev/null")
 558          SetNonBlock(File->Fd(),false);
 559       if (In.WriteSpace() == false)
 560          return true;
 561
 562       while (In.WriteSpace() == true)
 563       {
 564          if (In.Write(File->Fd()) == false)
 565             return _error->Errno("write",_("Error writing to file"));
 566          if (In.IsLimit() == true)
 567             return true;
 568       }
 569
 570       if (In.IsLimit() == true || Encoding == ServerState::Closes)
 571          return true;
 572    }
 573    return false;
 574 }
 575                                                                         /*}}}*/
 576 // HttpServerState::Go - Run a single loop                              /*{{{*/
 577 // ---------------------------------------------------------------------
 578 /* This runs the select loop over the server FDs, Output file FDs and
 579    stdin. */
 580 bool HttpServerState::Go(bool ToFile, FileFd * const File)
 581 {
 582    // Server has closed the connection
 583    if (ServerFd == -1 && (In.WriteSpace() == false ||
 584                                ToFile == false))
 585       return false;
 586
 587    fd_set rfds,wfds;
 588    FD_ZERO(&rfds);
 589    FD_ZERO(&wfds);
 590
 591    /* Add the server. We only send more requests if the connection will
 592       be persisting */
 593    if (Out.WriteSpace() == true && ServerFd != -1
 594        && Persistent == true)
 595       FD_SET(ServerFd,&wfds);
 596    if (In.ReadSpace() == true && ServerFd != -1)
 597       FD_SET(ServerFd,&rfds);
 598
 599    // Add the file
 600    int FileFD = -1;
 601    if (File != NULL)
 602       FileFD = File->Fd();
 603
 604    if (In.WriteSpace() == true && ToFile == true && FileFD != -1)
 605       FD_SET(FileFD,&wfds);
 606
 607    // Add stdin
 608    if (_config->FindB("Acquire::http::DependOnSTDIN", true) == true)
 609       FD_SET(STDIN_FILENO,&rfds);
 610
 611    // Figure out the max fd
 612    int MaxFd = FileFD;
 613    if (MaxFd < ServerFd)
 614       MaxFd = ServerFd;
 615
 616    // Select
 617    struct timeval tv;
 618    tv.tv_sec = TimeOut;
 619    tv.tv_usec = 0;
 620    int Res = 0;
 621    if ((Res = select(MaxFd+1,&rfds,&wfds,0,&tv)) < 0)
 622    {
 623       if (errno == EINTR)
 624          return true;
 625       return _error->Errno("select",_("Select failed"));
 626    }
 627
 628    if (Res == 0)
 629    {
 630       _error->Error(_("Connection timed out"));
 631       return Die(*File);
 632    }
 633
 634    // Handle server IO
 635    if (ServerFd != -1 && FD_ISSET(ServerFd,&rfds))
 636    {
 637       errno = 0;
 638       if (In.Read(ServerFd) == false)
 639          return Die(*File);
 640    }
 641
 642    if (ServerFd != -1 && FD_ISSET(ServerFd,&wfds))
 643    {
 644       errno = 0;
 645       if (Out.Write(ServerFd) == false)
 646          return Die(*File);
 647    }
 648
 649    // Send data to the file
 650    if (FileFD != -1 && FD_ISSET(FileFD,&wfds))
 651    {
 652       if (In.Write(FileFD) == false)
 653          return _error->Errno("write",_("Error writing to output file"));
 654    }
 655
 656    if (ExpectedSize > 0 && In.TotalWriten > ExpectedSize)
 657       return _error->Error("Writing more data than expected (%llu > %llu)",
 658                            In.TotalWriten, ExpectedSize);
 659
 660    // Handle commands from APT
 661    if (FD_ISSET(STDIN_FILENO,&rfds))
 662    {
 663       if (Owner->Run(true) != -1)
 664          exit(100);
 665    }
 666
 667    return true;
 668 }
 669                                                                         /*}}}*/
 670
 671 // HttpMethod::SendReq - Send the HTTP request                          /*{{{*/
 672 // ---------------------------------------------------------------------
 673 /* This places the http request in the outbound buffer */
 674 void HttpMethod::SendReq(FetchItem *Itm)
 675 {
 676    URI Uri = Itm->Uri;
 677
 678    // The HTTP server expects a hostname with a trailing :port
 679    std::stringstream Req;
 680    string ProperHost;
 681
 682    if (Uri.Host.find(':') != string::npos)
 683       ProperHost = '[' + Uri.Host + ']';
 684    else
 685       ProperHost = Uri.Host;
 686
 687    /* RFC 2616 §5.1.2 requires absolute URIs for requests to proxies,
 688       but while its a must for all servers to accept absolute URIs,
 689       it is assumed clients will sent an absolute path for non-proxies */
 690    std::string requesturi;
 691    if (Server->Proxy.empty() == true || Server->Proxy.Host.empty())
 692       requesturi = Uri.Path;
 693    else
 694       requesturi = Itm->Uri;
 695
 696    // The "+" is encoded as a workaround for a amazon S3 bug
 697    // see LP bugs #1003633 and #1086997.
 698    requesturi = QuoteString(requesturi, "+~ ");
 699
 700    /* Build the request. No keep-alive is included as it is the default
 701       in 1.1, can cause problems with proxies, and we are an HTTP/1.1
 702       client anyway.
 703       C.f. https://tools.ietf.org/wg/httpbis/trac/ticket/158 */
 704    Req << "GET " << requesturi << " HTTP/1.1\r\n";
 705    if (Uri.Port != 0)
 706       Req << "Host: " << ProperHost << ":" << Uri.Port << "\r\n";
 707    else
 708       Req << "Host: " << ProperHost << "\r\n";
 709
 710    // generate a cache control header (if needed)
 711    if (_config->FindB("Acquire::http::No-Cache",false) == true)
 712       Req << "Cache-Control: no-cache\r\n"
 713          << "Pragma: no-cache\r\n";
 714    else if (Itm->IndexFile == true)
 715       Req << "Cache-Control: max-age=" << _config->FindI("Acquire::http::Max-Age",0) << "\r\n";
 716    else if (_config->FindB("Acquire::http::No-Store",false) == true)
 717       Req << "Cache-Control: no-store\r\n";
 718
 719    // If we ask for uncompressed files servers might respond with content-
 720    // negotiation which lets us end up with compressed files we do not support,
 721    // see 657029, 657560 and co, so if we have no extension on the request
 722    // ask for text only. As a sidenote: If there is nothing to negotate servers
 723    // seem to be nice and ignore it.
 724    if (_config->FindB("Acquire::http::SendAccept", true) == true)
 725    {
 726       size_t const filepos = Itm->Uri.find_last_of('/');
 727       string const file = Itm->Uri.substr(filepos + 1);
 728       if (flExtension(file) == file)
 729          Req << "Accept: text/*\r\n";
 730    }
 731
 732    // Check for a partial file and send if-queries accordingly
 733    struct stat SBuf;
 734    if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 735       Req << "Range: bytes=" << SBuf.st_size << "-\r\n"
 736          << "If-Range: " << TimeRFC1123(SBuf.st_mtime) << "\r\n";
 737    else if (Itm->LastModified != 0)
 738       Req << "If-Modified-Since: " << TimeRFC1123(Itm->LastModified).c_str() << "\r\n";
 739
 740    if (Server->Proxy.User.empty() == false || Server->Proxy.Password.empty() == false)
 741       Req << "Proxy-Authorization: Basic "
 742          << Base64Encode(Server->Proxy.User + ":" + Server->Proxy.Password) << "\r\n";
 743
 744    maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc"));
 745    if (Uri.User.empty() == false || Uri.Password.empty() == false)
 746       Req << "Authorization: Basic "
 747          << Base64Encode(Uri.User + ":" + Uri.Password) << "\r\n";
 748
 749    Req << "User-Agent: " << _config->Find("Acquire::http::User-Agent",
 750                 "Debian APT-HTTP/1.3 (" PACKAGE_VERSION ")") << "\r\n";
 751
 752    Req << "\r\n";
 753
 754    if (Debug == true)
 755       cerr << Req << endl;
 756
 757    Server->WriteResponse(Req.str());
 758 }
 759                                                                         /*}}}*/
 760 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
 761 // ---------------------------------------------------------------------
 762 /* We stash the desired pipeline depth */
 763 bool HttpMethod::Configuration(string Message)
 764 {
 765    if (ServerMethod::Configuration(Message) == false)
 766       return false;
 767
 768    AllowRedirect = _config->FindB("Acquire::http::AllowRedirect",true);
 769    PipelineDepth = _config->FindI("Acquire::http::Pipeline-Depth",
 770                                   PipelineDepth);
 771    Debug = _config->FindB("Debug::Acquire::http",false);
 772
 773    // Get the proxy to use
 774    AutoDetectProxy();
 775
 776    return true;
 777 }
 778                                                                         /*}}}*/
 779 // HttpMethod::AutoDetectProxy - auto detect proxy                      /*{{{*/
 780 // ---------------------------------------------------------------------
 781 /* */
 782 bool HttpMethod::AutoDetectProxy()
 783 {
 784    // option is "Acquire::http::Proxy-Auto-Detect" but we allow the old
 785    // name without the dash ("-")
 786    AutoDetectProxyCmd = _config->Find("Acquire::http::Proxy-Auto-Detect",
 787                                       _config->Find("Acquire::http::ProxyAutoDetect"));
 788
 789    if (AutoDetectProxyCmd.empty())
 790       return true;
 791
 792    if (Debug)
 793       clog << "Using auto proxy detect command: " << AutoDetectProxyCmd << endl;
 794
 795    int Pipes[2] = {-1,-1};
 796    if (pipe(Pipes) != 0)
 797       return _error->Errno("pipe", "Failed to create Pipe");
 798
 799    pid_t Process = ExecFork();
 800    if (Process == 0)
 801    {
 802       close(Pipes[0]);
 803       dup2(Pipes[1],STDOUT_FILENO);
 804       SetCloseExec(STDOUT_FILENO,false);
 805
 806       const char *Args[2];
 807       Args[0] = AutoDetectProxyCmd.c_str();
 808       Args[1] = 0;
 809       execv(Args[0],(char **)Args);
 810       cerr << "Failed to exec method " << Args[0] << endl;
 811       _exit(100);
 812    }
 813    char buf[512];
 814    int InFd = Pipes[0];
 815    close(Pipes[1]);
 816    int res = read(InFd, buf, sizeof(buf)-1);
 817    ExecWait(Process, "ProxyAutoDetect", true);
 818
 819    if (res < 0)
 820       return _error->Errno("read", "Failed to read");
 821    if (res == 0)
 822       return _error->Warning("ProxyAutoDetect returned no data");
 823
 824    // add trailing \0
 825    buf[res] = 0;
 826
 827    if (Debug)
 828       clog << "auto detect command returned: '" << buf << "'" << endl;
 829
 830    if (strstr(buf, "http://") == buf)
 831       _config->Set("Acquire::http::proxy", _strstrip(buf));
 832
 833    return true;
 834 }
 835                                                                         /*}}}*/
 836 ServerState * HttpMethod::CreateServerState(URI uri)                    /*{{{*/
 837 {
 838    return new HttpServerState(uri, this);
 839 }
 840                                                                         /*}}}*/
 841 void HttpMethod::RotateDNS()                                            /*{{{*/
 842 {
 843    ::RotateDNS();
 844 }
 845                                                                         /*}}}*/