methods/http.cc.orig

   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 Aquire Method - This is the HTTP aquire 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 <apt-pkg/fileutl.h>
  29 #include <apt-pkg/acquire-method.h>
  30 #include <apt-pkg/error.h>
  31 #include <apt-pkg/hashes.h>
  32
  33 #include <sys/stat.h>
  34 #include <sys/time.h>
  35 #include <utime.h>
  36 #include <unistd.h>
  37 #include <signal.h>
  38 #include <stdio.h>
  39 #include <errno.h>
  40 #include <string.h>
  41 #include <iostream>
  42 #include <apti18n.h>
  43
  44 // Internet stuff
  45 #include <netdb.h>
  46
  47 #include <CoreFoundation/CoreFoundation.h>
  48 #include <CoreServices/CoreServices.h>
  49
  50 #include "connect.h"
  51 #include "rfc2553emu.h"
  52 #include "http.h"
  53
  54                                                                         /*}}}*/
  55 using namespace std;
  56
  57 string HttpMethod::FailFile;
  58 int HttpMethod::FailFd = -1;
  59 time_t HttpMethod::FailTime = 0;
  60 unsigned long PipelineDepth = 10;
  61 unsigned long TimeOut = 120;
  62 bool Debug = false;
  63
  64 unsigned long CircleBuf::BwReadLimit=0;
  65 unsigned long CircleBuf::BwTickReadData=0;
  66 struct timeval CircleBuf::BwReadTick={0,0};
  67 const unsigned int CircleBuf::BW_HZ=10;
  68
  69 // CircleBuf::CircleBuf - Circular input buffer                         /*{{{*/
  70 // ---------------------------------------------------------------------
  71 /* */
  72 CircleBuf::CircleBuf(unsigned long Size) : Size(Size), Hash(0)
  73 {
  74    Buf = new unsigned char[Size];
  75    Reset();
  76
  77    CircleBuf::BwReadLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024;
  78 }
  79                                                                         /*}}}*/
  80 // CircleBuf::Reset - Reset to the default state                        /*{{{*/
  81 // ---------------------------------------------------------------------
  82 /* */
  83 void CircleBuf::Reset()
  84 {
  85    InP = 0;
  86    OutP = 0;
  87    StrPos = 0;
  88    MaxGet = (unsigned int)-1;
  89    OutQueue = string();
  90    if (Hash != 0)
  91    {
  92       delete Hash;
  93       Hash = new Hashes;
  94    }
  95 };
  96                                                                         /*}}}*/
  97 // CircleBuf::Read - Read from a FD into the circular buffer            /*{{{*/
  98 // ---------------------------------------------------------------------
  99 /* This fills up the buffer with as much data as is in the FD, assuming it
 100    is non-blocking.. */
 101 bool CircleBuf::Read(int Fd)
 102 {
 103    unsigned long BwReadMax;
 104
 105    while (1)
 106    {
 107       // Woops, buffer is full
 108       if (InP - OutP == Size)
 109          return true;
 110
 111       // what's left to read in this tick
 112       BwReadMax = CircleBuf::BwReadLimit/BW_HZ;
 113
 114       if(CircleBuf::BwReadLimit) {
 115          struct timeval now;
 116          gettimeofday(&now,0);
 117
 118          unsigned long d = (now.tv_sec-CircleBuf::BwReadTick.tv_sec)*1000000 +
 119             now.tv_usec-CircleBuf::BwReadTick.tv_usec;
 120          if(d > 1000000/BW_HZ) {
 121             CircleBuf::BwReadTick = now;
 122             CircleBuf::BwTickReadData = 0;
 123          }
 124
 125          if(CircleBuf::BwTickReadData >= BwReadMax) {
 126             usleep(1000000/BW_HZ);
 127             return true;
 128          }
 129       }
 130
 131       // Write the buffer segment
 132       int Res;
 133       if(CircleBuf::BwReadLimit) {
 134          Res = read(Fd,Buf + (InP%Size),
 135                     BwReadMax > LeftRead() ? LeftRead() : BwReadMax);
 136       } else
 137          Res = read(Fd,Buf + (InP%Size),LeftRead());
 138
 139       if(Res > 0 && BwReadLimit > 0)
 140          CircleBuf::BwTickReadData += Res;
 141
 142       if (Res == 0)
 143          return false;
 144       if (Res < 0)
 145       {
 146          if (errno == EAGAIN)
 147             return true;
 148          return false;
 149       }
 150
 151       if (InP == 0)
 152          gettimeofday(&Start,0);
 153       InP += Res;
 154    }
 155 }
 156                                                                         /*}}}*/
 157 // CircleBuf::Read - Put the string into the buffer                     /*{{{*/
 158 // ---------------------------------------------------------------------
 159 /* This will hold the string in and fill the buffer with it as it empties */
 160 bool CircleBuf::Read(string Data)
 161 {
 162    OutQueue += Data;
 163    FillOut();
 164    return true;
 165 }
 166                                                                         /*}}}*/
 167 // CircleBuf::FillOut - Fill the buffer from the output queue           /*{{{*/
 168 // ---------------------------------------------------------------------
 169 /* */
 170 void CircleBuf::FillOut()
 171 {
 172    if (OutQueue.empty() == true)
 173       return;
 174    while (1)
 175    {
 176       // Woops, buffer is full
 177       if (InP - OutP == Size)
 178          return;
 179
 180       // Write the buffer segment
 181       unsigned long Sz = LeftRead();
 182       if (OutQueue.length() - StrPos < Sz)
 183          Sz = OutQueue.length() - StrPos;
 184       memcpy(Buf + (InP%Size),OutQueue.c_str() + StrPos,Sz);
 185
 186       // Advance
 187       StrPos += Sz;
 188       InP += Sz;
 189       if (OutQueue.length() == StrPos)
 190       {
 191          StrPos = 0;
 192          OutQueue = "";
 193          return;
 194       }
 195    }
 196 }
 197                                                                         /*}}}*/
 198 // CircleBuf::Write - Write from the buffer into a FD                   /*{{{*/
 199 // ---------------------------------------------------------------------
 200 /* This empties the buffer into the FD. */
 201 bool CircleBuf::Write(int Fd)
 202 {
 203    while (1)
 204    {
 205       FillOut();
 206
 207       // Woops, buffer is empty
 208       if (OutP == InP)
 209          return true;
 210
 211       if (OutP == MaxGet)
 212          return true;
 213
 214       // Write the buffer segment
 215       int Res;
 216       Res = write(Fd,Buf + (OutP%Size),LeftWrite());
 217
 218       if (Res == 0)
 219          return false;
 220       if (Res < 0)
 221       {
 222          if (errno == EAGAIN)
 223             return true;
 224
 225          return false;
 226       }
 227
 228       if (Hash != 0)
 229          Hash->Add(Buf + (OutP%Size),Res);
 230
 231       OutP += Res;
 232    }
 233 }
 234                                                                         /*}}}*/
 235 // CircleBuf::WriteTillEl - Write from the buffer to a string           /*{{{*/
 236 // ---------------------------------------------------------------------
 237 /* This copies till the first empty line */
 238 bool CircleBuf::WriteTillEl(string &Data,bool Single)
 239 {
 240    // We cheat and assume it is unneeded to have more than one buffer load
 241    for (unsigned long I = OutP; I < InP; I++)
 242    {
 243       if (Buf[I%Size] != '\n')
 244          continue;
 245       ++I;
 246
 247       if (Single == false)
 248       {
 249          if (I < InP  && Buf[I%Size] == '\r')
 250             ++I;
 251          if (I >= InP || Buf[I%Size] != '\n')
 252             continue;
 253          ++I;
 254       }
 255
 256       Data = "";
 257       while (OutP < I)
 258       {
 259          unsigned long Sz = LeftWrite();
 260          if (Sz == 0)
 261             return false;
 262          if (I - OutP < Sz)
 263             Sz = I - OutP;
 264          Data += string((char *)(Buf + (OutP%Size)),Sz);
 265          OutP += Sz;
 266       }
 267       return true;
 268    }
 269    return false;
 270 }
 271                                                                         /*}}}*/
 272 // CircleBuf::Stats - Print out stats information                       /*{{{*/
 273 // ---------------------------------------------------------------------
 274 /* */
 275 void CircleBuf::Stats()
 276 {
 277    if (InP == 0)
 278       return;
 279
 280    struct timeval Stop;
 281    gettimeofday(&Stop,0);
 282 /*   float Diff = Stop.tv_sec - Start.tv_sec +
 283              (float)(Stop.tv_usec - Start.tv_usec)/1000000;
 284    clog << "Got " << InP << " in " << Diff << " at " << InP/Diff << endl;*/
 285 }
 286                                                                         /*}}}*/
 287
 288 // ServerState::ServerState - Constructor                               /*{{{*/
 289 // ---------------------------------------------------------------------
 290 /* */
 291 ServerState::ServerState(URI Srv,HttpMethod *Owner) : Owner(Owner),
 292                         In(64*1024), Out(4*1024),
 293                         ServerName(Srv)
 294 {
 295    Reset();
 296 }
 297                                                                         /*}}}*/
 298 // ServerState::Open - Open a connection to the server                  /*{{{*/
 299 // ---------------------------------------------------------------------
 300 /* This opens a connection to the server. */
 301 bool ServerState::Open()
 302 {
 303    // Use the already open connection if possible.
 304    if (ServerFd != -1)
 305       return true;
 306
 307    Close();
 308    In.Reset();
 309    Out.Reset();
 310    Persistent = true;
 311
 312    // Determine the proxy setting
 313    if (getenv("http_proxy") == 0)
 314    {
 315       string DefProxy = _config->Find("Acquire::http::Proxy");
 316       string SpecificProxy = _config->Find("Acquire::http::Proxy::" + ServerName.Host);
 317       if (SpecificProxy.empty() == false)
 318       {
 319          if (SpecificProxy == "DIRECT")
 320             Proxy = "";
 321          else
 322             Proxy = SpecificProxy;
 323       }
 324       else
 325          Proxy = DefProxy;
 326    }
 327    else
 328       Proxy = getenv("http_proxy");
 329
 330    // Parse no_proxy, a , separated list of domains
 331    if (getenv("no_proxy") != 0)
 332    {
 333       if (CheckDomainList(ServerName.Host,getenv("no_proxy")) == true)
 334          Proxy = "";
 335    }
 336
 337    // Determine what host and port to use based on the proxy settings
 338    int Port = 0;
 339    string Host;
 340    if (Proxy.empty() == true || Proxy.Host.empty() == true)
 341    {
 342       if (ServerName.Port != 0)
 343          Port = ServerName.Port;
 344       Host = ServerName.Host;
 345    }
 346    else
 347    {
 348       if (Proxy.Port != 0)
 349          Port = Proxy.Port;
 350       Host = Proxy.Host;
 351    }
 352
 353    // Connect to the remote server
 354    if (Connect(Host,Port,"http",80,ServerFd,TimeOut,Owner) == false)
 355       return false;
 356
 357    return true;
 358 }
 359                                                                         /*}}}*/
 360 // ServerState::Close - Close a connection to the server                /*{{{*/
 361 // ---------------------------------------------------------------------
 362 /* */
 363 bool ServerState::Close()
 364 {
 365    close(ServerFd);
 366    ServerFd = -1;
 367    return true;
 368 }
 369                                                                         /*}}}*/
 370 // ServerState::RunHeaders - Get the headers before the data            /*{{{*/
 371 // ---------------------------------------------------------------------
 372 /* Returns 0 if things are OK, 1 if an IO error occursed and 2 if a header
 373    parse error occured */
 374 int ServerState::RunHeaders()
 375 {
 376    State = Header;
 377
 378    Owner->Status(_("Waiting for headers"));
 379
 380    Major = 0;
 381    Minor = 0;
 382    Result = 0;
 383    Size = 0;
 384    StartPos = 0;
 385    Encoding = Closes;
 386    HaveContent = false;
 387    time(&Date);
 388
 389    do
 390    {
 391       string Data;
 392       if (In.WriteTillEl(Data) == false)
 393          continue;
 394
 395       if (Debug == true)
 396          clog << Data;
 397
 398       for (string::const_iterator I = Data.begin(); I < Data.end(); I++)
 399       {
 400          string::const_iterator J = I;
 401          for (; J != Data.end() && *J != '\n' && *J != '\r';J++);
 402          if (HeaderLine(string(I,J)) == false)
 403             return 2;
 404          I = J;
 405       }
 406
 407       // 100 Continue is a Nop...
 408       if (Result == 100)
 409          continue;
 410
 411       // Tidy up the connection persistance state.
 412       if (Encoding == Closes && HaveContent == true)
 413          Persistent = false;
 414
 415       return 0;
 416    }
 417    while (Owner->Go(false,this) == true);
 418
 419    return 1;
 420 }
 421                                                                         /*}}}*/
 422 // ServerState::RunData - Transfer the data from the socket             /*{{{*/
 423 // ---------------------------------------------------------------------
 424 /* */
 425 bool ServerState::RunData()
 426 {
 427    State = Data;
 428
 429    // Chunked transfer encoding is fun..
 430    if (Encoding == Chunked)
 431    {
 432       while (1)
 433       {
 434          // Grab the block size
 435          bool Last = true;
 436          string Data;
 437          In.Limit(-1);
 438          do
 439          {
 440             if (In.WriteTillEl(Data,true) == true)
 441                break;
 442          }
 443          while ((Last = Owner->Go(false,this)) == true);
 444
 445          if (Last == false)
 446             return false;
 447
 448          // See if we are done
 449          unsigned long Len = strtol(Data.c_str(),0,16);
 450          if (Len == 0)
 451          {
 452             In.Limit(-1);
 453
 454             // We have to remove the entity trailer
 455             Last = true;
 456             do
 457             {
 458                if (In.WriteTillEl(Data,true) == true && Data.length() <= 2)
 459                   break;
 460             }
 461             while ((Last = Owner->Go(false,this)) == true);
 462             if (Last == false)
 463                return false;
 464             return !_error->PendingError();
 465          }
 466
 467          // Transfer the block
 468          In.Limit(Len);
 469          while (Owner->Go(true,this) == true)
 470             if (In.IsLimit() == true)
 471                break;
 472
 473          // Error
 474          if (In.IsLimit() == false)
 475             return false;
 476
 477          // The server sends an extra new line before the next block specifier..
 478          In.Limit(-1);
 479          Last = true;
 480          do
 481          {
 482             if (In.WriteTillEl(Data,true) == true)
 483                break;
 484          }
 485          while ((Last = Owner->Go(false,this)) == true);
 486          if (Last == false)
 487             return false;
 488       }
 489    }
 490    else
 491    {
 492       /* Closes encoding is used when the server did not specify a size, the
 493          loss of the connection means we are done */
 494       if (Encoding == Closes)
 495          In.Limit(-1);
 496       else
 497          In.Limit(Size - StartPos);
 498
 499       // Just transfer the whole block.
 500       do
 501       {
 502          if (In.IsLimit() == false)
 503             continue;
 504
 505          In.Limit(-1);
 506          return !_error->PendingError();
 507       }
 508       while (Owner->Go(true,this) == true);
 509    }
 510
 511    return Owner->Flush(this) && !_error->PendingError();
 512 }
 513                                                                         /*}}}*/
 514 // ServerState::HeaderLine - Process a header line                      /*{{{*/
 515 // ---------------------------------------------------------------------
 516 /* */
 517 bool ServerState::HeaderLine(string Line)
 518 {
 519    if (Line.empty() == true)
 520       return true;
 521
 522    // The http server might be trying to do something evil.
 523    if (Line.length() >= MAXLEN)
 524       return _error->Error(_("Got a single header line over %u chars"),MAXLEN);
 525
 526    string::size_type Pos = Line.find(' ');
 527    if (Pos == string::npos || Pos+1 > Line.length())
 528    {
 529       // Blah, some servers use "connection:closes", evil.
 530       Pos = Line.find(':');
 531       if (Pos == string::npos || Pos + 2 > Line.length())
 532          return _error->Error(_("Bad header line"));
 533       Pos++;
 534    }
 535
 536    // Parse off any trailing spaces between the : and the next word.
 537    string::size_type Pos2 = Pos;
 538    while (Pos2 < Line.length() && isspace(Line[Pos2]) != 0)
 539       Pos2++;
 540
 541    string Tag = string(Line,0,Pos);
 542    string Val = string(Line,Pos2);
 543
 544    if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0)
 545    {
 546       // Evil servers return no version
 547       if (Line[4] == '/')
 548       {
 549          if (sscanf(Line.c_str(),"HTTP/%u.%u %u %[^\n]",&Major,&Minor,
 550                     &Result,Code) != 4)
 551             return _error->Error(_("The HTTP server sent an invalid reply header"));
 552       }
 553       else
 554       {
 555          Major = 0;
 556          Minor = 9;
 557          if (sscanf(Line.c_str(),"HTTP %u %[^\n]",&Result,Code) != 2)
 558             return _error->Error(_("The HTTP server sent an invalid reply header"));
 559       }
 560
 561       /* Check the HTTP response header to get the default persistance
 562          state. */
 563       if (Major < 1)
 564          Persistent = false;
 565       else
 566       {
 567          if (Major == 1 && Minor <= 0)
 568             Persistent = false;
 569          else
 570             Persistent = true;
 571       }
 572
 573       return true;
 574    }
 575
 576    if (stringcasecmp(Tag,"Content-Length:") == 0)
 577    {
 578       if (Encoding == Closes)
 579          Encoding = Stream;
 580       HaveContent = true;
 581
 582       // The length is already set from the Content-Range header
 583       if (StartPos != 0)
 584          return true;
 585
 586       if (sscanf(Val.c_str(),"%lu",&Size) != 1)
 587          return _error->Error(_("The HTTP server sent an invalid Content-Length header"));
 588       return true;
 589    }
 590
 591    if (stringcasecmp(Tag,"Content-Type:") == 0)
 592    {
 593       HaveContent = true;
 594       return true;
 595    }
 596
 597    if (stringcasecmp(Tag,"Content-Range:") == 0)
 598    {
 599       HaveContent = true;
 600
 601       if (sscanf(Val.c_str(),"bytes %lu-%*u/%lu",&StartPos,&Size) != 2)
 602          return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
 603       if ((unsigned)StartPos > Size)
 604          return _error->Error(_("This HTTP server has broken range support"));
 605       return true;
 606    }
 607
 608    if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
 609    {
 610       HaveContent = true;
 611       if (stringcasecmp(Val,"chunked") == 0)
 612          Encoding = Chunked;
 613       return true;
 614    }
 615
 616    if (stringcasecmp(Tag,"Connection:") == 0)
 617    {
 618       if (stringcasecmp(Val,"close") == 0)
 619          Persistent = false;
 620       if (stringcasecmp(Val,"keep-alive") == 0)
 621          Persistent = true;
 622       return true;
 623    }
 624
 625    if (stringcasecmp(Tag,"Last-Modified:") == 0)
 626    {
 627       if (StrToTime(Val,Date) == false)
 628          return _error->Error(_("Unknown date format"));
 629       return true;
 630    }
 631
 632    return true;
 633 }
 634                                                                         /*}}}*/
 635
 636 // HttpMethod::SendReq - Send the HTTP request                          /*{{{*/
 637 // ---------------------------------------------------------------------
 638 /* This places the http request in the outbound buffer */
 639 void HttpMethod::SendReq(FetchItem *Itm,CircleBuf &Out)
 640 {
 641    URI Uri = Itm->Uri;
 642
 643    // The HTTP server expects a hostname with a trailing :port
 644    char Buf[1000];
 645    string ProperHost = Uri.Host;
 646    if (Uri.Port != 0)
 647    {
 648       sprintf(Buf,":%u",Uri.Port);
 649       ProperHost += Buf;
 650    }
 651
 652    // Just in case.
 653    if (Itm->Uri.length() >= sizeof(Buf))
 654        abort();
 655
 656    /* Build the request. We include a keep-alive header only for non-proxy
 657       requests. This is to tweak old http/1.0 servers that do support keep-alive
 658       but not HTTP/1.1 automatic keep-alive. Doing this with a proxy server
 659       will glitch HTTP/1.0 proxies because they do not filter it out and
 660       pass it on, HTTP/1.1 says the connection should default to keep alive
 661       and we expect the proxy to do this */
 662    if (Proxy.empty() == true || Proxy.Host.empty())
 663       sprintf(Buf,"GET %s HTTP/1.1\r\nHost: %s\r\nConnection: keep-alive\r\n",
 664               QuoteString(Uri.Path,"~").c_str(),ProperHost.c_str());
 665    else
 666    {
 667       /* Generate a cache control header if necessary. We place a max
 668          cache age on index files, optionally set a no-cache directive
 669          and a no-store directive for archives. */
 670       sprintf(Buf,"GET %s HTTP/1.1\r\nHost: %s\r\n",
 671               Itm->Uri.c_str(),ProperHost.c_str());
 672       // only generate a cache control header if we actually want to
 673       // use a cache
 674       if (_config->FindB("Acquire::http::No-Cache",false) == false)
 675       {
 676          if (Itm->IndexFile == true)
 677             sprintf(Buf+strlen(Buf),"Cache-Control: max-age=%u\r\n",
 678                     _config->FindI("Acquire::http::Max-Age",0));
 679          else
 680          {
 681             if (_config->FindB("Acquire::http::No-Store",false) == true)
 682                strcat(Buf,"Cache-Control: no-store\r\n");
 683          }
 684       }
 685    }
 686    // generate a no-cache header if needed
 687    if (_config->FindB("Acquire::http::No-Cache",false) == true)
 688       strcat(Buf,"Cache-Control: no-cache\r\nPragma: no-cache\r\n");
 689
 690
 691    string Req = Buf;
 692
 693    // Check for a partial file
 694    struct stat SBuf;
 695    if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 696    {
 697       // In this case we send an if-range query with a range header
 698       sprintf(Buf,"Range: bytes=%li-\r\nIf-Range: %s\r\n",(long)SBuf.st_size - 1,
 699               TimeRFC1123(SBuf.st_mtime).c_str());
 700       Req += Buf;
 701    }
 702    else
 703    {
 704       if (Itm->LastModified != 0)
 705       {
 706          sprintf(Buf,"If-Modified-Since: %s\r\n",TimeRFC1123(Itm->LastModified).c_str());
 707          Req += Buf;
 708       }
 709    }
 710
 711    if (Proxy.User.empty() == false || Proxy.Password.empty() == false)
 712       Req += string("Proxy-Authorization: Basic ") +
 713           Base64Encode(Proxy.User + ":" + Proxy.Password) + "\r\n";
 714
 715    if (Uri.User.empty() == false || Uri.Password.empty() == false)
 716       Req += string("Authorization: Basic ") +
 717           Base64Encode(Uri.User + ":" + Uri.Password) + "\r\n";
 718
 719    Req += "User-Agent: Debian APT-HTTP/1.3\r\n\r\n";
 720
 721    if (Debug == true)
 722       cerr << Req << endl;
 723
 724    Out.Read(Req);
 725 }
 726                                                                         /*}}}*/
 727 // HttpMethod::Go - Run a single loop                                   /*{{{*/
 728 // ---------------------------------------------------------------------
 729 /* This runs the select loop over the server FDs, Output file FDs and
 730    stdin. */
 731 bool HttpMethod::Go(bool ToFile,ServerState *Srv)
 732 {
 733    // Server has closed the connection
 734    if (Srv->ServerFd == -1 && (Srv->In.WriteSpace() == false ||
 735                                ToFile == false))
 736       return false;
 737
 738    fd_set rfds,wfds;
 739    FD_ZERO(&rfds);
 740    FD_ZERO(&wfds);
 741
 742    /* Add the server. We only send more requests if the connection will
 743       be persisting */
 744    if (Srv->Out.WriteSpace() == true && Srv->ServerFd != -1
 745        && Srv->Persistent == true)
 746       FD_SET(Srv->ServerFd,&wfds);
 747    if (Srv->In.ReadSpace() == true && Srv->ServerFd != -1)
 748       FD_SET(Srv->ServerFd,&rfds);
 749
 750    // Add the file
 751    int FileFD = -1;
 752    if (File != 0)
 753       FileFD = File->Fd();
 754
 755    if (Srv->In.WriteSpace() == true && ToFile == true && FileFD != -1)
 756       FD_SET(FileFD,&wfds);
 757
 758    // Add stdin
 759    FD_SET(STDIN_FILENO,&rfds);
 760
 761    // Figure out the max fd
 762    int MaxFd = FileFD;
 763    if (MaxFd < Srv->ServerFd)
 764       MaxFd = Srv->ServerFd;
 765
 766    // Select
 767    struct timeval tv;
 768    tv.tv_sec = TimeOut;
 769    tv.tv_usec = 0;
 770    int Res = 0;
 771    if ((Res = select(MaxFd+1,&rfds,&wfds,0,&tv)) < 0)
 772    {
 773       if (errno == EINTR)
 774          return true;
 775       return _error->Errno("select",_("Select failed"));
 776    }
 777
 778    if (Res == 0)
 779    {
 780       _error->Error(_("Connection timed out"));
 781       return ServerDie(Srv);
 782    }
 783
 784    // Handle server IO
 785    if (Srv->ServerFd != -1 && FD_ISSET(Srv->ServerFd,&rfds))
 786    {
 787       errno = 0;
 788       if (Srv->In.Read(Srv->ServerFd) == false)
 789          return ServerDie(Srv);
 790    }
 791
 792    if (Srv->ServerFd != -1 && FD_ISSET(Srv->ServerFd,&wfds))
 793    {
 794       errno = 0;
 795       if (Srv->Out.Write(Srv->ServerFd) == false)
 796          return ServerDie(Srv);
 797    }
 798
 799    // Send data to the file
 800    if (FileFD != -1 && FD_ISSET(FileFD,&wfds))
 801    {
 802       if (Srv->In.Write(FileFD) == false)
 803          return _error->Errno("write",_("Error writing to output file"));
 804    }
 805
 806    // Handle commands from APT
 807    if (FD_ISSET(STDIN_FILENO,&rfds))
 808    {
 809       if (Run(true) != -1)
 810          exit(100);
 811    }
 812
 813    return true;
 814 }
 815                                                                         /*}}}*/
 816 // HttpMethod::Flush - Dump the buffer into the file                    /*{{{*/
 817 // ---------------------------------------------------------------------
 818 /* This takes the current input buffer from the Server FD and writes it
 819    into the file */
 820 bool HttpMethod::Flush(ServerState *Srv)
 821 {
 822    if (File != 0)
 823    {
 824       // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking
 825       // can't be set
 826       if (File->Name() != "/dev/null")
 827          SetNonBlock(File->Fd(),false);
 828       if (Srv->In.WriteSpace() == false)
 829          return true;
 830
 831       while (Srv->In.WriteSpace() == true)
 832       {
 833          if (Srv->In.Write(File->Fd()) == false)
 834             return _error->Errno("write",_("Error writing to file"));
 835          if (Srv->In.IsLimit() == true)
 836             return true;
 837       }
 838
 839       if (Srv->In.IsLimit() == true || Srv->Encoding == ServerState::Closes)
 840          return true;
 841    }
 842    return false;
 843 }
 844                                                                         /*}}}*/
 845 // HttpMethod::ServerDie - The server has closed the connection.        /*{{{*/
 846 // ---------------------------------------------------------------------
 847 /* */
 848 bool HttpMethod::ServerDie(ServerState *Srv)
 849 {
 850    unsigned int LErrno = errno;
 851
 852    // Dump the buffer to the file
 853    if (Srv->State == ServerState::Data)
 854    {
 855       // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking
 856       // can't be set
 857       if (File->Name() != "/dev/null")
 858          SetNonBlock(File->Fd(),false);
 859       while (Srv->In.WriteSpace() == true)
 860       {
 861          if (Srv->In.Write(File->Fd()) == false)
 862             return _error->Errno("write",_("Error writing to the file"));
 863
 864          // Done
 865          if (Srv->In.IsLimit() == true)
 866             return true;
 867       }
 868    }
 869
 870    // See if this is because the server finished the data stream
 871    if (Srv->In.IsLimit() == false && Srv->State != ServerState::Header &&
 872        Srv->Encoding != ServerState::Closes)
 873    {
 874       Srv->Close();
 875       if (LErrno == 0)
 876          return _error->Error(_("Error reading from server. Remote end closed connection"));
 877       errno = LErrno;
 878       return _error->Errno("read",_("Error reading from server"));
 879    }
 880    else
 881    {
 882       Srv->In.Limit(-1);
 883
 884       // Nothing left in the buffer
 885       if (Srv->In.WriteSpace() == false)
 886          return false;
 887
 888       // We may have got multiple responses back in one packet..
 889       Srv->Close();
 890       return true;
 891    }
 892
 893    return false;
 894 }
 895                                                                         /*}}}*/
 896 // HttpMethod::DealWithHeaders - Handle the retrieved header data       /*{{{*/
 897 // ---------------------------------------------------------------------
 898 /* We look at the header data we got back from the server and decide what
 899    to do. Returns
 900      0 - File is open,
 901      1 - IMS hit
 902      3 - Unrecoverable error
 903      4 - Error with error content page
 904      5 - Unrecoverable non-server error (close the connection) */
 905 int HttpMethod::DealWithHeaders(FetchResult &Res,ServerState *Srv)
 906 {
 907    // Not Modified
 908    if (Srv->Result == 304)
 909    {
 910       unlink(Queue->DestFile.c_str());
 911       Res.IMSHit = true;
 912       Res.LastModified = Queue->LastModified;
 913       return 1;
 914    }
 915
 916    /* We have a reply we dont handle. This should indicate a perm server
 917       failure */
 918    if (Srv->Result < 200 || Srv->Result >= 300)
 919    {
 920       _error->Error("%u %s",Srv->Result,Srv->Code);
 921       if (Srv->HaveContent == true)
 922          return 4;
 923       return 3;
 924    }
 925
 926    // This is some sort of 2xx 'data follows' reply
 927    Res.LastModified = Srv->Date;
 928    Res.Size = Srv->Size;
 929
 930    // Open the file
 931    delete File;
 932    File = new FileFd(Queue->DestFile,FileFd::WriteAny);
 933    if (_error->PendingError() == true)
 934       return 5;
 935
 936    FailFile = Queue->DestFile;
 937    FailFile.c_str();   // Make sure we dont do a malloc in the signal handler
 938    FailFd = File->Fd();
 939    FailTime = Srv->Date;
 940
 941    // Set the expected size
 942    if (Srv->StartPos >= 0)
 943    {
 944       Res.ResumePoint = Srv->StartPos;
 945       ftruncate(File->Fd(),Srv->StartPos);
 946    }
 947
 948    // Set the start point
 949    lseek(File->Fd(),0,SEEK_END);
 950
 951    delete Srv->In.Hash;
 952    Srv->In.Hash = new Hashes;
 953
 954    // Fill the Hash if the file is non-empty (resume)
 955    if (Srv->StartPos > 0)
 956    {
 957       lseek(File->Fd(),0,SEEK_SET);
 958       if (Srv->In.Hash->AddFD(File->Fd(),Srv->StartPos) == false)
 959       {
 960          _error->Errno("read",_("Problem hashing file"));
 961          return 5;
 962       }
 963       lseek(File->Fd(),0,SEEK_END);
 964    }
 965
 966    SetNonBlock(File->Fd(),true);
 967    return 0;
 968 }
 969                                                                         /*}}}*/
 970 // HttpMethod::SigTerm - Handle a fatal signal                          /*{{{*/
 971 // ---------------------------------------------------------------------
 972 /* This closes and timestamps the open file. This is neccessary to get
 973    resume behavoir on user abort */
 974 void HttpMethod::SigTerm(int)
 975 {
 976    if (FailFd == -1)
 977       _exit(100);
 978    close(FailFd);
 979
 980    // Timestamp
 981    struct utimbuf UBuf;
 982    UBuf.actime = FailTime;
 983    UBuf.modtime = FailTime;
 984    utime(FailFile.c_str(),&UBuf);
 985
 986    _exit(100);
 987 }
 988                                                                         /*}}}*/
 989 // HttpMethod::Fetch - Fetch an item                                    /*{{{*/
 990 // ---------------------------------------------------------------------
 991 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 992    depth. */
 993 bool HttpMethod::Fetch(FetchItem *)
 994 {
 995    if (Server == 0)
 996       return true;
 997
 998    // Queue the requests
 999    int Depth = -1;
1000    bool Tail = false;
1001    for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
1002         I = I->Next, Depth++)
1003    {
1004       // If pipelining is disabled, we only queue 1 request
1005       if (Server->Pipeline == false && Depth >= 0)
1006          break;
1007
1008       // Make sure we stick with the same server
1009       if (Server->Comp(I->Uri) == false)
1010          break;
1011       if (QueueBack == I)
1012          Tail = true;
1013       if (Tail == true)
1014       {
1015          QueueBack = I->Next;
1016          SendReq(I,Server->Out);
1017          continue;
1018       }
1019    }
1020
1021    return true;
1022 };
1023                                                                         /*}}}*/
1024 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
1025 // ---------------------------------------------------------------------
1026 /* We stash the desired pipeline depth */
1027 bool HttpMethod::Configuration(string Message)
1028 {
1029    if (pkgAcqMethod::Configuration(Message) == false)
1030       return false;
1031
1032    TimeOut = _config->FindI("Acquire::http::Timeout",TimeOut);
1033    PipelineDepth = _config->FindI("Acquire::http::Pipeline-Depth",
1034                                   PipelineDepth);
1035    Debug = _config->FindB("Debug::Acquire::http",false);
1036
1037    return true;
1038 }
1039                                                                         /*}}}*/
1040 // HttpMethod::Loop - Main loop                                         /*{{{*/
1041 // ---------------------------------------------------------------------
1042 /* */
1043 int HttpMethod::Loop()
1044 {
1045    signal(SIGTERM,SigTerm);
1046    signal(SIGINT,SigTerm);
1047
1048    Server = 0;
1049
1050    int FailCounter = 0;
1051    while (1)
1052    {
1053       // We have no commands, wait for some to arrive
1054       if (Queue == 0)
1055       {
1056          if (WaitFd(STDIN_FILENO) == false)
1057             return 0;
1058       }
1059
1060       /* Run messages, we can accept 0 (no message) if we didn't
1061          do a WaitFd above.. Otherwise the FD is closed. */
1062       int Result = Run(true);
1063       if (Result != -1 && (Result != 0 || Queue == 0))
1064          return 100;
1065
1066       if (Queue == 0)
1067          continue;
1068
1069       CFStringEncoding se = kCFStringEncodingUTF8;
1070
1071       CFStringRef sr = CFStringCreateWithCString(kCFAllocatorDefault, Queue->Uri.c_str(), se);
1072       CFURLRef ur = CFURLCreateWithString(kCFAllocatorDefault, sr, NULL);
1073       CFRelease(sr);
1074       CFHTTPMessageRef hm = CFHTTPMessageCreateRequest(kCFAllocatorDefault, CFSTR("GET"), ur, kCFHTTPVersion1_1);
1075       CFRelease(ur);
1076
1077       struct stat SBuf;
1078       if (stat(Queue->DestFile.c_str(), &SBuf) >= 0 && SBuf.st_size > 0) {
1079          sr = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("bytes=%li-"), (long) SBuf.st_size - 1);
1080          CFHTTPMessageSetHeaderFieldValue(hm, CFSTR("Range"), sr);
1081          CFRelease(sr);
1082
1083          sr = CFStringCreateWithCString(kCFAllocatorDefault, TimeRFC1123(SBuf.st_mtime).c_str(), se);
1084          CFHTTPMessageSetHeaderFieldValue(hm, CFSTR("If-Range"), sr);
1085          CFRelease(sr);
1086       } else if (Queue->LastModified != 0) {
1087          sr = CFStringCreateWithCString(kCFAllocatorDefault, TimeRFC1123(SBuf.st_mtime).c_str(), se);
1088          CFHTTPMessageSetHeaderFieldValue(hm, CFSTR("If-Modified-Since"), sr);
1089          CFRelease(sr);
1090       }
1091
1092       CFHTTPMessageSetHeaderFieldValue(hm, CFSTR("User-Agent"), CFSTR("Telesphoreo APT-HTTP/1.0.98"));
1093       CFReadStreamRef rs = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, hm);
1094       CFRelease(hm);
1095
1096       CFReadStreamSetProperty(rs, kCFStreamPropertyHTTPShouldAutoredirect, kCFBooleanTrue);
1097       CFReadStreamSetProperty(rs, kCFStreamPropertyHTTPAttemptPersistentConnection, kCFBooleanTrue);
1098
1099       URI uri = Queue->Uri;
1100
1101       FetchResult Res;
1102
1103       uint8_t data[10240];
1104       size_t offset = 0;
1105
1106       Status("Connecting to %s", uri.Host.c_str());
1107
1108       if (!CFReadStreamOpen(rs)) {
1109          _error->Error("Unable to open stream");
1110          Fail(true);
1111          goto done;
1112       }
1113
1114       CFIndex rd = CFReadStreamRead(rs, data, sizeof(data));
1115
1116       if (rd == -1) {
1117          _error->Error("Stream read failure");
1118          Fail(true);
1119          goto done;
1120       }
1121
1122       Res.Filename = Queue->DestFile;
1123
1124       hm = (CFHTTPMessageRef) CFReadStreamCopyProperty(rs, kCFStreamPropertyHTTPResponseHeader);
1125       UInt32 sc = CFHTTPMessageGetResponseStatusCode(hm);
1126
1127       sr = CFHTTPMessageCopyHeaderFieldValue(hm, CFSTR("Content-Range"));
1128       if (sr != NULL) {
1129          size_t ln = CFStringGetLength(sr) + 1;
1130          char cr[ln];
1131
1132          if (!CFStringGetCString(sr, cr, ln, se)) {
1133             Fail();
1134             goto done;
1135          }
1136
1137          CFRelease(sr);
1138
1139          if (sscanf(cr, "bytes %lu-%*u/%lu", &offset, &Res.Size) != 2) {
1140             _error->Error(_("The HTTP server sent an invalid Content-Range header"));
1141             Fail();
1142             goto done;
1143          }
1144
1145          if (offset > Res.Size) {
1146             _error->Error(_("This HTTP server has broken range support"));
1147             Fail();
1148             goto done;
1149          }
1150       } else {
1151          sr = CFHTTPMessageCopyHeaderFieldValue(hm, CFSTR("Content-Length"));
1152          if (sr != NULL) {
1153             Res.Size = CFStringGetIntValue(sr);
1154             CFRelease(sr);
1155          }
1156       }
1157
1158       time(&Res.LastModified);
1159
1160       sr = CFHTTPMessageCopyHeaderFieldValue(hm, CFSTR("Last-Modified"));
1161       if (sr != NULL) {
1162          size_t ln = CFStringGetLength(sr) + 1;
1163          char cr[ln];
1164
1165          if (!CFStringGetCString(sr, cr, ln, se)) {
1166             Fail();
1167             goto done;
1168          }
1169
1170          CFRelease(sr);
1171
1172          if (!StrToTime(cr, Res.LastModified)) {
1173             _error->Error(_("Unknown date format"));
1174             Fail();
1175             goto done;
1176          }
1177       }
1178
1179       CFRelease(hm);
1180
1181       if (sc == 304) {
1182          unlink(Queue->DestFile.c_str());
1183          Res.IMSHit = true;
1184          Res.LastModified = Queue->LastModified;
1185          URIDone(Res);
1186       } else if (sc < 200 || sc >= 300)
1187          Fail();
1188       else {
1189          Hashes hash;
1190
1191          File = new FileFd(Queue->DestFile, FileFd::WriteAny);
1192          if (_error->PendingError() == true) {
1193             delete File;
1194             File = NULL;
1195             Fail();
1196             goto done;
1197          }
1198
1199          FailFile = Queue->DestFile;
1200          FailFile.c_str();   // Make sure we dont do a malloc in the signal handler
1201          FailFd = File->Fd();
1202          FailTime = Res.LastModified;
1203
1204          Res.ResumePoint = offset;
1205          ftruncate(File->Fd(), offset);
1206
1207          if (offset != 0) {
1208             lseek(File->Fd(), 0, SEEK_SET);
1209             if (!hash.AddFD(File->Fd(), offset)) {
1210                _error->Errno("read", _("Problem hashing file"));
1211                delete File;
1212                File = NULL;
1213                Fail();
1214                goto done;
1215             }
1216          }
1217
1218          lseek(File->Fd(), 0, SEEK_END);
1219
1220          URIStart(Res);
1221
1222          read: if (rd == -1) {
1223             _error->Error("Stream read failure");
1224             Fail(true);
1225          } else if (rd == 0) {
1226             if (Res.Size == 0)
1227                Res.Size = File->Size();
1228
1229             struct utimbuf UBuf;
1230             time(&UBuf.actime);
1231             UBuf.actime = Res.LastModified;
1232             UBuf.modtime = Res.LastModified;
1233             utime(Queue->DestFile.c_str(), &UBuf);
1234
1235             Res.TakeHashes(hash);
1236             URIDone(Res);
1237          } else {
1238             hash.Add(data, rd);
1239
1240             uint8_t *dt = data;
1241             while (rd != 0) {
1242                int sz = write(File->Fd(), dt, rd);
1243
1244                if (sz == -1) {
1245                    delete File;
1246                    File = NULL;
1247                    Fail();
1248                    goto done;
1249                }
1250
1251                dt += sz;
1252                rd -= sz;
1253             }
1254
1255             rd = CFReadStreamRead(rs, data, sizeof(data));
1256             goto read;
1257          }
1258       }
1259
1260     done:
1261       CFRelease(rs);
1262
1263       FailCounter = 0;
1264    }
1265
1266    return 0;
1267 }
1268                                                                         /*}}}*/
1269
1270 int main()
1271 {
1272    setlocale(LC_ALL, "");
1273
1274    HttpMethod Mth;
1275
1276    return Mth.Loop();
1277 }
1278
1279