methods/ftp.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: ftp.cc,v 1.14 1999/07/18 23:06:56 jgg Exp $
   4 /* ######################################################################
   5
   6    HTTP Aquire Method - This is the FTP aquire method for APT.
   7
   8    This is a very simple implementation that does not try to optimize
   9    at all. Commands are sent syncronously with the FTP server (as the
  10    rfc recommends, but it is not really necessary..) and no tricks are
  11    done to speed things along.
  12
  13    RFC 2428 describes the IPv6 FTP behavior
  14
  15    ##################################################################### */
  16                                                                         /*}}}*/
  17 // Include Files                                                        /*{{{*/
  18 #include <apt-pkg/fileutl.h>
  19 #include <apt-pkg/acquire-method.h>
  20 #include <apt-pkg/error.h>
  21 #include <apt-pkg/md5.h>
  22
  23 #include <sys/stat.h>
  24 #include <sys/time.h>
  25 #include <utime.h>
  26 #include <unistd.h>
  27 #include <signal.h>
  28 #include <stdio.h>
  29 #include <errno.h>
  30 #include <stdarg.h>
  31
  32 // Internet stuff
  33 #include <netinet/in.h>
  34 #include <sys/socket.h>
  35 #include <arpa/inet.h>
  36 #include <netdb.h>
  37
  38 #include "rfc2553emu.h"
  39 #include "connect.h"
  40 #include "ftp.h"
  41                                                                         /*}}}*/
  42
  43 unsigned long TimeOut = 120;
  44 URI Proxy;
  45 string FtpMethod::FailFile;
  46 int FtpMethod::FailFd = -1;
  47 time_t FtpMethod::FailTime = 0;
  48
  49 // FTPConn::FTPConn - Constructor                                       /*{{{*/
  50 // ---------------------------------------------------------------------
  51 /* */
  52 FTPConn::FTPConn(URI Srv) : Len(0), ServerFd(-1), DataFd(-1),
  53                             DataListenFd(-1), ServerName(Srv)
  54 {
  55    Debug = _config->FindB("Debug::Acquire::Ftp",false);
  56    memset(&PasvAddr,0,sizeof(PasvAddr));
  57 }
  58                                                                         /*}}}*/
  59 // FTPConn::~FTPConn - Destructor                                       /*{{{*/
  60 // ---------------------------------------------------------------------
  61 /* */
  62 FTPConn::~FTPConn()
  63 {
  64    Close();
  65 }
  66                                                                         /*}}}*/
  67 // FTPConn::Close - Close down the connection                           /*{{{*/
  68 // ---------------------------------------------------------------------
  69 /* Just tear down the socket and data socket */
  70 void FTPConn::Close()
  71 {
  72    close(ServerFd);
  73    ServerFd = -1;
  74    close(DataFd);
  75    DataFd = -1;
  76    close(DataListenFd);
  77    DataListenFd = -1;
  78    memset(&PasvAddr,0,sizeof(PasvAddr));
  79 }
  80                                                                         /*}}}*/
  81 // FTPConn::Open - Open a new connection                                /*{{{*/
  82 // ---------------------------------------------------------------------
  83 /* Connect to the server using a non-blocking connection and perform a
  84    login. */
  85 bool FTPConn::Open(pkgAcqMethod *Owner)
  86 {
  87    // Use the already open connection if possible.
  88    if (ServerFd != -1)
  89       return true;
  90
  91    Close();
  92
  93    // Determine the proxy setting
  94    if (getenv("ftp_proxy") == 0)
  95    {
  96       string DefProxy = _config->Find("Acquire::ftp::Proxy");
  97       string SpecificProxy = _config->Find("Acquire::ftp::Proxy::" + ServerName.Host);
  98       if (SpecificProxy.empty() == false)
  99       {
 100          if (SpecificProxy == "DIRECT")
 101             Proxy = "";
 102          else
 103             Proxy = SpecificProxy;
 104       }
 105       else
 106          Proxy = DefProxy;
 107    }
 108    else
 109       Proxy = getenv("ftp_proxy");
 110
 111    // Determine what host and port to use based on the proxy settings
 112    int Port = 0;
 113    string Host;
 114    if (Proxy.empty() == true)
 115    {
 116       if (ServerName.Port != 0)
 117          Port = ServerName.Port;
 118       Host = ServerName.Host;
 119    }
 120    else
 121    {
 122       if (Proxy.Port != 0)
 123          Port = Proxy.Port;
 124       Host = Proxy.Host;
 125    }
 126
 127    // Connect to the remote server
 128    if (Connect(Host,Port,"ftp",21,ServerFd,TimeOut,Owner) == false)
 129       return false;
 130    socklen_t Len = sizeof(Peer);
 131    if (getpeername(ServerFd,(sockaddr *)&Peer,&Len) != 0)
 132       return _error->Errno("getpeername","Unable to determine the peer name");
 133
 134    Owner->Status("Logging in");
 135    return Login();
 136 }
 137                                                                         /*}}}*/
 138 // FTPConn::Login - Login to the remote server                          /*{{{*/
 139 // ---------------------------------------------------------------------
 140 /* This performs both normal login and proxy login using a simples script
 141    stored in the config file. */
 142 bool FTPConn::Login()
 143 {
 144    unsigned int Tag;
 145    string Msg;
 146
 147    // Setup the variables needed for authentication
 148    string User = "anonymous";
 149    string Pass = "apt_get_ftp_2.0@debian.linux.user";
 150
 151    // Fill in the user/pass
 152    if (ServerName.User.empty() == false)
 153       User = ServerName.User;
 154    if (ServerName.Password.empty() == false)
 155       Pass = ServerName.Password;
 156
 157    // Perform simple login
 158    if (Proxy.empty() == true)
 159    {
 160       // Read the initial response
 161       if (ReadResp(Tag,Msg) == false)
 162          return false;
 163       if (Tag >= 400)
 164          return _error->Error("Server refused our connection and said: %s",Msg.c_str());
 165
 166       // Send the user
 167       if (WriteMsg(Tag,Msg,"USER %s",User.c_str()) == false)
 168          return false;
 169       if (Tag >= 400)
 170          return _error->Error("USER failed, server said: %s",Msg.c_str());
 171
 172       // Send the Password
 173       if (WriteMsg(Tag,Msg,"PASS %s",Pass.c_str()) == false)
 174          return false;
 175       if (Tag >= 400)
 176          return _error->Error("PASS failed, server said: %s",Msg.c_str());
 177
 178       // Enter passive mode
 179       if (_config->Exists("Acquire::FTP::Passive::" + ServerName.Host) == true)
 180          TryPassive = _config->FindB("Acquire::FTP::Passive::" + ServerName.Host,true);
 181       else
 182          TryPassive = _config->FindB("Acquire::FTP::Passive",true);
 183    }
 184    else
 185    {
 186       // Read the initial response
 187       if (ReadResp(Tag,Msg) == false)
 188          return false;
 189       if (Tag >= 400)
 190          return _error->Error("Server refused our connection and said: %s",Msg.c_str());
 191
 192       // Perform proxy script execution
 193       Configuration::Item const *Opts = _config->Tree("Acquire::ftp::ProxyLogin");
 194       if (Opts == 0 || Opts->Child == 0)
 195          return _error->Error("A proxy server was specified but no login "
 196                               "script, Acquire::ftp::ProxyLogin is empty.");
 197       Opts = Opts->Child;
 198
 199       // Iterate over the entire login script
 200       for (; Opts != 0; Opts = Opts->Next)
 201       {
 202          if (Opts->Value.empty() == true)
 203             continue;
 204
 205          // Substitute the variables into the command
 206          char SitePort[20];
 207          if (ServerName.Port != 0)
 208             sprintf(SitePort,"%u",ServerName.Port);
 209          else
 210             strcpy(SitePort,"21");
 211          string Tmp = Opts->Value;
 212          Tmp = SubstVar(Tmp,"$(PROXY_USER)",Proxy.User);
 213          Tmp = SubstVar(Tmp,"$(PROXY_PASS)",Proxy.Password);
 214          Tmp = SubstVar(Tmp,"$(SITE_USER)",User);
 215          Tmp = SubstVar(Tmp,"$(SITE_PASS)",Pass);
 216          Tmp = SubstVar(Tmp,"$(SITE_PORT)",SitePort);
 217          Tmp = SubstVar(Tmp,"$(SITE)",ServerName.Host);
 218
 219          // Send the command
 220          if (WriteMsg(Tag,Msg,"%s",Tmp.c_str()) == false)
 221             return false;
 222          if (Tag >= 400)
 223             return _error->Error("Login script command '%s' failed, server said: %s",Tmp.c_str(),Msg.c_str());
 224       }
 225
 226       // Enter passive mode
 227       TryPassive = false;
 228       if (_config->Exists("Acquire::FTP::Passive::" + ServerName.Host) == true)
 229          TryPassive = _config->FindB("Acquire::FTP::Passive::" + ServerName.Host,true);
 230       else
 231       {
 232          if (_config->Exists("Acquire::FTP::Proxy::Passive") == true)
 233             TryPassive = _config->FindB("Acquire::FTP::Proxy::Passive",true);
 234          else
 235             TryPassive = _config->FindB("Acquire::FTP::Passive",true);
 236       }
 237    }
 238
 239    // Binary mode
 240    if (WriteMsg(Tag,Msg,"TYPE I") == false)
 241       return false;
 242    if (Tag >= 400)
 243       return _error->Error("TYPE failed, server said: %s",Msg.c_str());
 244
 245    return true;
 246 }
 247                                                                         /*}}}*/
 248 // FTPConn::ReadLine - Read a line from the server                      /*{{{*/
 249 // ---------------------------------------------------------------------
 250 /* This performs a very simple buffered read. */
 251 bool FTPConn::ReadLine(string &Text)
 252 {
 253    if (ServerFd == -1)
 254       return false;
 255
 256    // Suck in a line
 257    while (Len < sizeof(Buffer))
 258    {
 259       // Scan the buffer for a new line
 260       for (unsigned int I = 0; I != Len; I++)
 261       {
 262          // Escape some special chars
 263          if (Buffer[I] == 0)
 264             Buffer[I] = '?';
 265
 266          // End of line?
 267          if (Buffer[I] != '\n')
 268             continue;
 269
 270          I++;
 271          Text = string(Buffer,I);
 272          memmove(Buffer,Buffer+I,Len - I);
 273          Len -= I;
 274          return true;
 275       }
 276
 277       // Wait for some data..
 278       if (WaitFd(ServerFd,false,TimeOut) == false)
 279       {
 280          Close();
 281          return _error->Error("Connection timeout");
 282       }
 283
 284       // Suck it back
 285       int Res = read(ServerFd,Buffer + Len,sizeof(Buffer) - Len);
 286       if (Res <= 0)
 287       {
 288          Close();
 289          return _error->Errno("read","Read error");
 290       }
 291       Len += Res;
 292    }
 293
 294    return _error->Error("A response overflowed the buffer.");
 295 }
 296                                                                         /*}}}*/
 297 // FTPConn::ReadResp - Read a full response from the server             /*{{{*/
 298 // ---------------------------------------------------------------------
 299 /* This reads a reply code from the server, it handles both p */
 300 bool FTPConn::ReadResp(unsigned int &Ret,string &Text)
 301 {
 302    // Grab the first line of the response
 303    string Msg;
 304    if (ReadLine(Msg) == false)
 305        return false;
 306
 307    // Get the ID code
 308    char *End;
 309    Ret = strtol(Msg.c_str(),&End,10);
 310    if (End - Msg.c_str() != 3)
 311       return _error->Error("Protocol corruption");
 312
 313    // All done ?
 314    Text = Msg.c_str()+4;
 315    if (*End == ' ')
 316    {
 317       if (Debug == true)
 318          cerr << "<- '" << QuoteString(Text,"") << "'" << endl;
 319       return true;
 320    }
 321
 322    if (*End != '-')
 323       return _error->Error("Protocol corruption");
 324
 325    /* Okay, here we do the continued message trick. This is foolish, but
 326       proftpd follows the protocol as specified and wu-ftpd doesn't, so
 327       we filter. I wonder how many clients break if you use proftpd and
 328       put a '- in the 3rd spot in the message? */
 329    char Leader[4];
 330    strncpy(Leader,Msg.c_str(),3);
 331    Leader[3] = 0;
 332    while (ReadLine(Msg) == true)
 333    {
 334       // Short, it must be using RFC continuation..
 335       if (Msg.length() < 4)
 336       {
 337          Text += Msg;
 338          continue;
 339       }
 340
 341       // Oops, finished
 342       if (strncmp(Msg.c_str(),Leader,3) == 0 && Msg[3] == ' ')
 343       {
 344          Text += Msg.c_str()+4;
 345          break;
 346       }
 347
 348       // This message has the wu-ftpd style reply code prefixed
 349       if (strncmp(Msg.c_str(),Leader,3) == 0 && Msg[3] == '-')
 350       {
 351          Text += Msg.c_str()+4;
 352          continue;
 353       }
 354
 355       // Must be RFC style prefixing
 356       Text += Msg;
 357    }
 358
 359    if (Debug == true && _error->PendingError() == false)
 360       cerr << "<- '" << QuoteString(Text,"") << "'" << endl;
 361
 362    return !_error->PendingError();
 363 }
 364                                                                         /*}}}*/
 365 // FTPConn::WriteMsg - Send a message to the server                     /*{{{*/
 366 // ---------------------------------------------------------------------
 367 /* Simple printf like function.. */
 368 bool FTPConn::WriteMsg(unsigned int &Ret,string &Text,const char *Fmt,...)
 369 {
 370    va_list args;
 371    va_start(args,Fmt);
 372
 373    // sprintf the description
 374    char S[400];
 375    vsnprintf(S,sizeof(S) - 4,Fmt,args);
 376    strcat(S,"\r\n");
 377
 378    if (Debug == true)
 379       cerr << "-> '" << QuoteString(S,"") << "'" << endl;
 380
 381    // Send it off
 382    unsigned long Len = strlen(S);
 383    unsigned long Start = 0;
 384    while (Len != 0)
 385    {
 386       if (WaitFd(ServerFd,true,TimeOut) == false)
 387       {
 388          Close();
 389          return _error->Error("Connection timeout");
 390       }
 391
 392       int Res = write(ServerFd,S + Start,Len);
 393       if (Res <= 0)
 394       {
 395          Close();
 396          return _error->Errno("write","Write Error");
 397       }
 398
 399       Len -= Res;
 400       Start += Res;
 401    }
 402
 403    return ReadResp(Ret,Text);
 404 }
 405                                                                         /*}}}*/
 406 // FTPConn::GoPasv - Enter Passive mode                                 /*{{{*/
 407 // ---------------------------------------------------------------------
 408 /* Try to enter passive mode, the return code does not indicate if passive
 409    mode could or could not be established, only if there was a fatal error.
 410    Borrowed mostly from lftp. We have to enter passive mode every time
 411  we make a data connection :| */
 412 bool FTPConn::GoPasv()
 413 {
 414    // Try to enable pasv mode
 415    unsigned int Tag;
 416    string Msg;
 417    if (WriteMsg(Tag,Msg,"PASV") == false)
 418       return false;
 419
 420    // Unsupported function
 421    string::size_type Pos = Msg.find('(');
 422    if (Tag >= 400 || Pos == string::npos)
 423    {
 424       memset(&PasvAddr,0,sizeof(PasvAddr));
 425       return true;
 426    }
 427
 428    // Scan it
 429    unsigned a0,a1,a2,a3,p0,p1;
 430    if (sscanf(Msg.c_str() + Pos,"(%u,%u,%u,%u,%u,%u)",&a0,&a1,&a2,&a3,&p0,&p1) != 6)
 431    {
 432       memset(&PasvAddr,0,sizeof(PasvAddr));
 433       return true;
 434    }
 435
 436    // lftp used this horrid byte order manipulation.. Ik.
 437    PasvAddr.sin_family = AF_INET;
 438    unsigned char *a;
 439    unsigned char *p;
 440    a = (unsigned char *)&PasvAddr.sin_addr;
 441    p = (unsigned char *)&PasvAddr.sin_port;
 442
 443    // Some evil servers return 0 to mean their addr
 444    if (a0 == 0 && a1 == 0 && a2 == 0 && a3 == 0)
 445    {
 446       PasvAddr.sin_addr = Peer.sin_addr;
 447    }
 448    else
 449    {
 450       a[0] = a0;
 451       a[1] = a1;
 452       a[2] = a2;
 453       a[3] = a3;
 454    }
 455
 456    p[0] = p0;
 457    p[1] = p1;
 458
 459    return true;
 460 }
 461                                                                         /*}}}*/
 462 // FTPConn::Size - Return the size of a file                            /*{{{*/
 463 // ---------------------------------------------------------------------
 464 /* Grab the file size from the server, 0 means no size or empty file */
 465 bool FTPConn::Size(const char *Path,unsigned long &Size)
 466 {
 467    // Query the size
 468    unsigned int Tag;
 469    string Msg;
 470    Size = 0;
 471    if (WriteMsg(Tag,Msg,"SIZE %s",Path) == false)
 472       return false;
 473
 474    char *End;
 475    Size = strtol(Msg.c_str(),&End,10);
 476    if (Tag >= 400 || End == Msg.c_str())
 477       Size = 0;
 478    return true;
 479 }
 480                                                                         /*}}}*/
 481 // FTPConn::ModTime - Return the modification time of the file          /*{{{*/
 482 // ---------------------------------------------------------------------
 483 /* Like Size no error is returned if the command is not supported. If the
 484    command fails then time is set to the current time of day to fool
 485    date checks. */
 486 bool FTPConn::ModTime(const char *Path, time_t &Time)
 487 {
 488    Time = time(&Time);
 489
 490    // Query the mod time
 491    unsigned int Tag;
 492    string Msg;
 493    if (WriteMsg(Tag,Msg,"MDTM %s",Path) == false)
 494       return false;
 495    if (Tag >= 400 || Msg.empty() == true || isdigit(Msg[0]) == 0)
 496       return true;
 497
 498    // Parse it
 499    struct tm tm;
 500    memset(&tm,0,sizeof(tm));
 501    if (sscanf(Msg.c_str(),"%4d%2d%2d%2d%2d%2d",&tm.tm_year,&tm.tm_mon,
 502               &tm.tm_mday,&tm.tm_hour,&tm.tm_min,&tm.tm_sec) != 6)
 503       return true;
 504
 505    tm.tm_year -= 1900;
 506    tm.tm_mon--;
 507
 508    /* We use timegm from the GNU C library, libapt-pkg will provide this
 509       symbol if it does not exist */
 510    Time = timegm(&tm);
 511    return true;
 512 }
 513                                                                         /*}}}*/
 514 // FTPConn::CreateDataFd - Get a data connection                        /*{{{*/
 515 // ---------------------------------------------------------------------
 516 /* Create the data connection. Call FinalizeDataFd after this though.. */
 517 bool FTPConn::CreateDataFd()
 518 {
 519    close(DataFd);
 520    DataFd = -1;
 521
 522    // Attempt to enter passive mode.
 523    if (TryPassive == true)
 524    {
 525       if (GoPasv() == false)
 526          return false;
 527
 528       // Oops, didn't work out, don't bother trying again.
 529       if (PasvAddr.sin_port == 0)
 530          TryPassive = false;
 531    }
 532
 533    // Passive mode?
 534    if (PasvAddr.sin_port != 0)
 535    {
 536       // Get a socket
 537       if ((DataFd = socket(AF_INET,SOCK_STREAM,0)) < 0)
 538          return _error->Errno("socket","Could not create a socket");
 539
 540       // Connect to the server
 541       SetNonBlock(DataFd,true);
 542       if (connect(DataFd,(sockaddr *)&PasvAddr,sizeof(PasvAddr)) < 0 &&
 543           errno != EINPROGRESS)
 544          return _error->Errno("socket","Could not create a socket");
 545
 546       /* This implements a timeout for connect by opening the connection
 547          nonblocking */
 548       if (WaitFd(ServerFd,true,TimeOut) == false)
 549          return _error->Error("Could not connect data socket, connection timed out");
 550       unsigned int Err;
 551       unsigned int Len = sizeof(Err);
 552       if (getsockopt(ServerFd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0)
 553          return _error->Errno("getsockopt","Failed");
 554       if (Err != 0)
 555          return _error->Error("Could not connect.");
 556
 557       return true;
 558    }
 559
 560    // Port mode :<
 561    close(DataListenFd);
 562    DataListenFd = -1;
 563
 564    // Get a socket
 565    if ((DataListenFd = socket(AF_INET,SOCK_STREAM,0)) < 0)
 566       return _error->Errno("socket","Could not create a socket");
 567
 568    // Bind and listen
 569    sockaddr_in Addr;
 570    memset(&Addr,0,sizeof(Addr));
 571    if (bind(DataListenFd,(sockaddr *)&Addr,sizeof(Addr)) < 0)
 572       return _error->Errno("bind","Could not bind a socket");
 573    if (listen(DataListenFd,1) < 0)
 574       return _error->Errno("listen","Could not listen on the socket");
 575    SetNonBlock(DataListenFd,true);
 576
 577    // Determine the name to send to the remote
 578    sockaddr_in Addr2;
 579    socklen_t Jnk = sizeof(Addr);
 580    if (getsockname(DataListenFd,(sockaddr *)&Addr,&Jnk) < 0)
 581       return _error->Errno("getsockname","Could not determine the socket's name");
 582    Jnk = sizeof(Addr2);
 583    if (getsockname(ServerFd,(sockaddr *)&Addr2,&Jnk) < 0)
 584       return _error->Errno("getsockname","Could not determine the socket's name");
 585
 586    // This bit ripped from qftp
 587    unsigned long badr = ntohl(*(unsigned long *)&Addr2.sin_addr);
 588    unsigned long bp = ntohs(Addr.sin_port);
 589
 590    // Send the port command
 591    unsigned int Tag;
 592    string Msg;
 593    if (WriteMsg(Tag,Msg,"PORT %d,%d,%d,%d,%d,%d",
 594                 (int) (badr >> 24) & 0xff, (int) (badr >> 16) & 0xff,
 595                 (int) (badr >> 8) & 0xff,  (int) badr & 0xff,
 596                 (int) (bp >> 8) & 0xff, (int) bp & 0xff) == false)
 597       return false;
 598    if (Tag >= 400)
 599       return _error->Error("Unable to send port command");
 600
 601    return true;
 602 }
 603                                                                         /*}}}*/
 604 // FTPConn::Finalize - Complete the Data connection                     /*{{{*/
 605 // ---------------------------------------------------------------------
 606 /* If the connection is in port mode this waits for the other end to hook
 607    up to us. */
 608 bool FTPConn::Finalize()
 609 {
 610    // Passive mode? Do nothing
 611    if (PasvAddr.sin_port != 0)
 612       return true;
 613
 614    // Close any old socket..
 615    close(DataFd);
 616    DataFd = -1;
 617
 618    // Wait for someone to connect..
 619    if (WaitFd(DataListenFd,false,TimeOut) == false)
 620       return _error->Error("Data socket connect timed out");
 621
 622    // Accept the connection
 623    struct sockaddr_in Addr;
 624    socklen_t Len = sizeof(Addr);
 625    DataFd = accept(DataListenFd,(struct sockaddr *)&Addr,&Len);
 626    if (DataFd < 0)
 627       return _error->Errno("accept","Unable to accept connection");
 628
 629    close(DataListenFd);
 630    DataListenFd = -1;
 631
 632    return true;
 633 }
 634                                                                         /*}}}*/
 635 // FTPConn::Get - Get a file                                            /*{{{*/
 636 // ---------------------------------------------------------------------
 637 /* This opens a data connection, sends REST and RETR and then
 638    transfers the file over. */
 639 bool FTPConn::Get(const char *Path,FileFd &To,unsigned long Resume,
 640                   MD5Summation &MD5,bool &Missing)
 641 {
 642    Missing = false;
 643    if (CreateDataFd() == false)
 644       return false;
 645
 646    unsigned int Tag;
 647    string Msg;
 648    if (Resume != 0)
 649    {
 650       if (WriteMsg(Tag,Msg,"REST %u",Resume) == false)
 651          return false;
 652       if (Tag >= 400)
 653          Resume = 0;
 654    }
 655
 656    if (To.Truncate(Resume) == false)
 657       return false;
 658
 659    if (To.Seek(0) == false)
 660       return false;
 661
 662    if (Resume != 0)
 663    {
 664       if (MD5.AddFD(To.Fd(),Resume) == false)
 665       {
 666          _error->Errno("read","Problem hashing file");
 667          return false;
 668       }
 669    }
 670
 671    // Send the get command
 672    if (WriteMsg(Tag,Msg,"RETR %s",Path) == false)
 673       return false;
 674
 675    if (Tag >= 400)
 676    {
 677       if (Tag == 550)
 678          Missing = true;
 679       return _error->Error("Unable to fetch file, server said '%s'",Msg.c_str());
 680    }
 681
 682    // Finish off the data connection
 683    if (Finalize() == false)
 684       return false;
 685
 686    // Copy loop
 687    unsigned char Buffer[4096];
 688    while (1)
 689    {
 690       // Wait for some data..
 691       if (WaitFd(DataFd,false,TimeOut) == false)
 692       {
 693          Close();
 694          return _error->Error("Data socket timed out");
 695       }
 696
 697       // Read the data..
 698       int Res = read(DataFd,Buffer,sizeof(Buffer));
 699       if (Res == 0)
 700          break;
 701       if (Res < 0)
 702       {
 703          if (errno == EAGAIN)
 704             continue;
 705          break;
 706       }
 707
 708       MD5.Add(Buffer,Res);
 709       if (To.Write(Buffer,Res) == false)
 710       {
 711          Close();
 712          return false;
 713       }
 714    }
 715
 716    // All done
 717    close(DataFd);
 718    DataFd = -1;
 719
 720    // Read the closing message from the server
 721    if (ReadResp(Tag,Msg) == false)
 722       return false;
 723    if (Tag >= 400)
 724       return _error->Error("Data transfer failed, server said '%s'",Msg.c_str());
 725    return true;
 726 }
 727                                                                         /*}}}*/
 728
 729 // FtpMethod::FtpMethod - Constructor                                   /*{{{*/
 730 // ---------------------------------------------------------------------
 731 /* */
 732 FtpMethod::FtpMethod() : pkgAcqMethod("1.0",SendConfig)
 733 {
 734    signal(SIGTERM,SigTerm);
 735    signal(SIGINT,SigTerm);
 736
 737    Server = 0;
 738    FailFd = -1;
 739 }
 740                                                                         /*}}}*/
 741 // FtpMethod::SigTerm - Handle a fatal signal                           /*{{{*/
 742 // ---------------------------------------------------------------------
 743 /* This closes and timestamps the open file. This is neccessary to get
 744    resume behavoir on user abort */
 745 void FtpMethod::SigTerm(int)
 746 {
 747    if (FailFd == -1)
 748       exit(100);
 749    close(FailFd);
 750
 751    // Timestamp
 752    struct utimbuf UBuf;
 753    UBuf.actime = FailTime;
 754    UBuf.modtime = FailTime;
 755    utime(FailFile.c_str(),&UBuf);
 756
 757    exit(100);
 758 }
 759                                                                         /*}}}*/
 760 // FtpMethod::Configuration - Handle a configuration message            /*{{{*/
 761 // ---------------------------------------------------------------------
 762 /* We stash the desired pipeline depth */
 763 bool FtpMethod::Configuration(string Message)
 764 {
 765    if (pkgAcqMethod::Configuration(Message) == false)
 766       return false;
 767
 768    TimeOut = _config->FindI("Acquire::Ftp::Timeout",TimeOut);
 769    return true;
 770 }
 771                                                                         /*}}}*/
 772 // FtpMethod::Fetch - Fetch a file                                      /*{{{*/
 773 // ---------------------------------------------------------------------
 774 /* Fetch a single file, called by the base class..  */
 775 bool FtpMethod::Fetch(FetchItem *Itm)
 776 {
 777    URI Get = Itm->Uri;
 778    const char *File = Get.Path.c_str();
 779    FetchResult Res;
 780    Res.Filename = Itm->DestFile;
 781    Res.IMSHit = false;
 782
 783    // Connect to the server
 784    if (Server == 0 || Server->Comp(Get) == false)
 785    {
 786       delete Server;
 787       Server = new FTPConn(Get);
 788    }
 789
 790    // Could not connect is a transient error..
 791    if (Server->Open(this) == false)
 792    {
 793       Server->Close();
 794       Fail(true);
 795       return true;
 796    }
 797
 798    // Get the files information
 799    Status("Query");
 800    unsigned long Size;
 801    if (Server->Size(File,Size) == false ||
 802        Server->ModTime(File,FailTime) == false)
 803    {
 804       Fail(true);
 805       return true;
 806    }
 807    Res.Size = Size;
 808
 809    // See if it is an IMS hit
 810    if (Itm->LastModified == FailTime)
 811    {
 812       Res.Size = 0;
 813       Res.IMSHit = true;
 814       URIDone(Res);
 815       return true;
 816    }
 817
 818    // See if the file exists
 819    struct stat Buf;
 820    if (stat(Itm->DestFile.c_str(),&Buf) == 0)
 821    {
 822       if (Size == (unsigned)Buf.st_size && FailTime == Buf.st_mtime)
 823       {
 824          Res.Size = Buf.st_size;
 825          Res.LastModified = Buf.st_mtime;
 826          URIDone(Res);
 827          return true;
 828       }
 829
 830       // Resume?
 831       if (FailTime == Buf.st_mtime && Size > (unsigned)Buf.st_size)
 832          Res.ResumePoint = Buf.st_size;
 833    }
 834
 835    // Open the file
 836    MD5Summation MD5;
 837    {
 838       FileFd Fd(Itm->DestFile,FileFd::WriteAny);
 839       if (_error->PendingError() == true)
 840          return false;
 841
 842       URIStart(Res);
 843
 844       FailFile = Itm->DestFile;
 845       FailFile.c_str();   // Make sure we dont do a malloc in the signal handler
 846       FailFd = Fd.Fd();
 847
 848       bool Missing;
 849       if (Server->Get(File,Fd,Res.ResumePoint,MD5,Missing) == false)
 850       {
 851          // If the file is missing we hard fail otherwise transient fail
 852          if (Missing == true)
 853             return false;
 854          Fail(true);
 855          return true;
 856       }
 857
 858       Res.Size = Fd.Size();
 859    }
 860
 861    Res.LastModified = FailTime;
 862    Res.MD5Sum = MD5.Result();
 863
 864    // Timestamp
 865    struct utimbuf UBuf;
 866    time(&UBuf.actime);
 867    UBuf.actime = FailTime;
 868    UBuf.modtime = FailTime;
 869    utime(Queue->DestFile.c_str(),&UBuf);
 870    FailFd = -1;
 871
 872    URIDone(Res);
 873
 874    return true;
 875 }
 876                                                                         /*}}}*/
 877
 878 int main(int argc,const char *argv[])
 879 {
 880    /* See if we should be come the http client - we do this for http
 881       proxy urls */
 882    if (getenv("ftp_proxy") != 0)
 883    {
 884       URI Proxy = string(getenv("ftp_proxy"));
 885       if (Proxy.Access == "http")
 886       {
 887          // Copy over the environment setting
 888          char S[300];
 889          snprintf(S,sizeof(S),"http_proxy=%s",getenv("ftp_proxy"));
 890          putenv(S);
 891
 892          // Run the http method
 893          string Path = flNotFile(argv[0]) + "/http";
 894          execl(Path.c_str(),Path.c_str(),0);
 895          cerr << "Unable to invoke " << Path << endl;
 896          exit(100);
 897       }
 898    }
 899
 900    FtpMethod Mth;
 901
 902    return Mth.Run();
 903 }