methods/ftp.cc

   1 extern "C" {
   2     #include <mach-o/nlist.h>
   3 }
   4
   5 // -*- mode: cpp; mode: fold -*-
   6 // Description                                                          /*{{{*/
   7 // $Id: ftp.cc,v 1.31.2.1 2004/01/16 18:58:50 mdz Exp $
   8 /* ######################################################################
   9
  10    FTP Aquire Method - This is the FTP aquire method for APT.
  11
  12    This is a very simple implementation that does not try to optimize
  13    at all. Commands are sent syncronously with the FTP server (as the
  14    rfc recommends, but it is not really necessary..) and no tricks are
  15    done to speed things along.
  16
  17    RFC 2428 describes the IPv6 FTP behavior
  18
  19    ##################################################################### */
  20                                                                         /*}}}*/
  21 // Include Files                                                        /*{{{*/
  22 #include <apt-pkg/fileutl.h>
  23 #include <apt-pkg/acquire-method.h>
  24 #include <apt-pkg/error.h>
  25 #include <apt-pkg/hashes.h>
  26
  27 #include <sys/stat.h>
  28 #include <sys/time.h>
  29 #include <utime.h>
  30 #include <unistd.h>
  31 #include <signal.h>
  32 #include <stdio.h>
  33 #include <errno.h>
  34 #include <stdarg.h>
  35 #include <iostream>
  36 #include <apti18n.h>
  37
  38 // Internet stuff
  39 #include <netinet/in.h>
  40 #include <sys/socket.h>
  41 #include <arpa/inet.h>
  42 #include <netdb.h>
  43
  44 #include "rfc2553emu.h"
  45 #include "connect.h"
  46 #include "ftp.h"
  47                                                                         /*}}}*/
  48
  49 using namespace std;
  50
  51 /* This table is for the EPRT and EPSV commands, it maps the OS address
  52    family to the IETF address families */
  53 struct AFMap
  54 {
  55    unsigned long Family;
  56    unsigned long IETFFamily;
  57 };
  58
  59 #ifndef AF_INET6
  60 struct AFMap AFMap[] = {{AF_INET,1},{}};
  61 #else
  62 struct AFMap AFMap[] = {{AF_INET,1},{AF_INET6,2},{}};
  63 #endif
  64
  65 unsigned long TimeOut = 120;
  66 URI Proxy;
  67 string FtpMethod::FailFile;
  68 int FtpMethod::FailFd = -1;
  69 time_t FtpMethod::FailTime = 0;
  70
  71 // FTPConn::FTPConn - Constructor                                       /*{{{*/
  72 // ---------------------------------------------------------------------
  73 /* */
  74 FTPConn::FTPConn(URI Srv) : Len(0), ServerFd(-1), DataFd(-1),
  75                             DataListenFd(-1), ServerName(Srv)
  76 {
  77    Debug = _config->FindB("Debug::Acquire::Ftp",false);
  78    PasvAddr = 0;
  79 }
  80                                                                         /*}}}*/
  81 // FTPConn::~FTPConn - Destructor                                       /*{{{*/
  82 // ---------------------------------------------------------------------
  83 /* */
  84 FTPConn::~FTPConn()
  85 {
  86    Close();
  87 }
  88                                                                         /*}}}*/
  89 // FTPConn::Close - Close down the connection                           /*{{{*/
  90 // ---------------------------------------------------------------------
  91 /* Just tear down the socket and data socket */
  92 void FTPConn::Close()
  93 {
  94    close(ServerFd);
  95    ServerFd = -1;
  96    close(DataFd);
  97    DataFd = -1;
  98    close(DataListenFd);
  99    DataListenFd = -1;
 100
 101    if (PasvAddr != 0)
 102       freeaddrinfo(PasvAddr);
 103    PasvAddr = 0;
 104 }
 105                                                                         /*}}}*/
 106 // FTPConn::Open - Open a new connection                                /*{{{*/
 107 // ---------------------------------------------------------------------
 108 /* Connect to the server using a non-blocking connection and perform a
 109    login. */
 110 bool FTPConn::Open(pkgAcqMethod *Owner)
 111 {
 112    // Use the already open connection if possible.
 113    if (ServerFd != -1)
 114       return true;
 115
 116    Close();
 117
 118    // Determine the proxy setting
 119    if (getenv("ftp_proxy") == 0)
 120    {
 121       string DefProxy = _config->Find("Acquire::ftp::Proxy");
 122       string SpecificProxy = _config->Find("Acquire::ftp::Proxy::" + ServerName.Host);
 123       if (SpecificProxy.empty() == false)
 124       {
 125          if (SpecificProxy == "DIRECT")
 126             Proxy = "";
 127          else
 128             Proxy = SpecificProxy;
 129       }
 130       else
 131          Proxy = DefProxy;
 132    }
 133    else
 134       Proxy = getenv("ftp_proxy");
 135
 136    // Parse no_proxy, a , separated list of domains
 137    if (getenv("no_proxy") != 0)
 138    {
 139       if (CheckDomainList(ServerName.Host,getenv("no_proxy")) == true)
 140          Proxy = "";
 141    }
 142
 143    // Determine what host and port to use based on the proxy settings
 144    int Port = 0;
 145    string Host;
 146    if (Proxy.empty() == true)
 147    {
 148       if (ServerName.Port != 0)
 149          Port = ServerName.Port;
 150       Host = ServerName.Host;
 151    }
 152    else
 153    {
 154       if (Proxy.Port != 0)
 155          Port = Proxy.Port;
 156       Host = Proxy.Host;
 157    }
 158
 159    /* Connect to the remote server. Since FTP is connection oriented we
 160       want to make sure we get a new server every time we reconnect */
 161    RotateDNS();
 162    if (Connect(Host,Port,"ftp",21,ServerFd,TimeOut,Owner) == false)
 163       return false;
 164
 165    // Login must be before getpeername otherwise dante won't work.
 166    Owner->Status(_("Logging in"));
 167    bool Res = Login();
 168
 169    // Get the remote server's address
 170    PeerAddrLen = sizeof(PeerAddr);
 171    if (getpeername(ServerFd,(sockaddr *)&PeerAddr,&PeerAddrLen) != 0)
 172       return _error->Errno("getpeername",_("Unable to determine the peer name"));
 173
 174    // Get the local machine's address
 175    ServerAddrLen = sizeof(ServerAddr);
 176    if (getsockname(ServerFd,(sockaddr *)&ServerAddr,&ServerAddrLen) != 0)
 177       return _error->Errno("getsockname",_("Unable to determine the local name"));
 178
 179    return Res;
 180 }
 181                                                                         /*}}}*/
 182 // FTPConn::Login - Login to the remote server                          /*{{{*/
 183 // ---------------------------------------------------------------------
 184 /* This performs both normal login and proxy login using a simples script
 185    stored in the config file. */
 186 bool FTPConn::Login()
 187 {
 188    unsigned int Tag;
 189    string Msg;
 190
 191    // Setup the variables needed for authentication
 192    string User = "anonymous";
 193    string Pass = "apt_get_ftp_2.1@debian.linux.user";
 194
 195    // Fill in the user/pass
 196    if (ServerName.User.empty() == false)
 197       User = ServerName.User;
 198    if (ServerName.Password.empty() == false)
 199       Pass = ServerName.Password;
 200
 201    // Perform simple login
 202    if (Proxy.empty() == true)
 203    {
 204       // Read the initial response
 205       if (ReadResp(Tag,Msg) == false)
 206          return false;
 207       if (Tag >= 400)
 208          return _error->Error(_("The server refused the connection and said: %s"),Msg.c_str());
 209
 210       // Send the user
 211       if (WriteMsg(Tag,Msg,"USER %s",User.c_str()) == false)
 212          return false;
 213       if (Tag >= 400)
 214          return _error->Error(_("USER failed, server said: %s"),Msg.c_str());
 215
 216       if (Tag == 331) { // 331 User name okay, need password.
 217          // Send the Password
 218          if (WriteMsg(Tag,Msg,"PASS %s",Pass.c_str()) == false)
 219             return false;
 220          if (Tag >= 400)
 221             return _error->Error(_("PASS failed, server said: %s"),Msg.c_str());
 222       }
 223
 224       // Enter passive mode
 225       if (_config->Exists("Acquire::FTP::Passive::" + ServerName.Host) == true)
 226          TryPassive = _config->FindB("Acquire::FTP::Passive::" + ServerName.Host,true);
 227       else
 228          TryPassive = _config->FindB("Acquire::FTP::Passive",true);
 229    }
 230    else
 231    {
 232       // Read the initial response
 233       if (ReadResp(Tag,Msg) == false)
 234          return false;
 235       if (Tag >= 400)
 236          return _error->Error(_("The server refused the connection and said: %s"),Msg.c_str());
 237
 238       // Perform proxy script execution
 239       Configuration::Item const *Opts = _config->Tree("Acquire::ftp::ProxyLogin");
 240       if (Opts == 0 || Opts->Child == 0)
 241          return _error->Error(_("A proxy server was specified but no login "
 242                               "script, Acquire::ftp::ProxyLogin is empty."));
 243       Opts = Opts->Child;
 244
 245       // Iterate over the entire login script
 246       for (; Opts != 0; Opts = Opts->Next)
 247       {
 248          if (Opts->Value.empty() == true)
 249             continue;
 250
 251          // Substitute the variables into the command
 252          char SitePort[20];
 253          if (ServerName.Port != 0)
 254             sprintf(SitePort,"%u",ServerName.Port);
 255          else
 256             strcpy(SitePort,"21");
 257          string Tmp = Opts->Value;
 258          Tmp = SubstVar(Tmp,"$(PROXY_USER)",Proxy.User);
 259          Tmp = SubstVar(Tmp,"$(PROXY_PASS)",Proxy.Password);
 260          Tmp = SubstVar(Tmp,"$(SITE_USER)",User);
 261          Tmp = SubstVar(Tmp,"$(SITE_PASS)",Pass);
 262          Tmp = SubstVar(Tmp,"$(SITE_PORT)",SitePort);
 263          Tmp = SubstVar(Tmp,"$(SITE)",ServerName.Host);
 264
 265          // Send the command
 266          if (WriteMsg(Tag,Msg,"%s",Tmp.c_str()) == false)
 267             return false;
 268          if (Tag >= 400)
 269             return _error->Error(_("Login script command '%s' failed, server said: %s"),Tmp.c_str(),Msg.c_str());
 270       }
 271
 272       // Enter passive mode
 273       TryPassive = false;
 274       if (_config->Exists("Acquire::FTP::Passive::" + ServerName.Host) == true)
 275          TryPassive = _config->FindB("Acquire::FTP::Passive::" + ServerName.Host,true);
 276       else
 277       {
 278          if (_config->Exists("Acquire::FTP::Proxy::Passive") == true)
 279             TryPassive = _config->FindB("Acquire::FTP::Proxy::Passive",true);
 280          else
 281             TryPassive = _config->FindB("Acquire::FTP::Passive",true);
 282       }
 283    }
 284
 285    // Force the use of extended commands
 286    if (_config->Exists("Acquire::FTP::ForceExtended::" + ServerName.Host) == true)
 287       ForceExtended = _config->FindB("Acquire::FTP::ForceExtended::" + ServerName.Host,true);
 288    else
 289       ForceExtended = _config->FindB("Acquire::FTP::ForceExtended",false);
 290
 291    // Binary mode
 292    if (WriteMsg(Tag,Msg,"TYPE I") == false)
 293       return false;
 294    if (Tag >= 400)
 295       return _error->Error(_("TYPE failed, server said: %s"),Msg.c_str());
 296
 297    return true;
 298 }
 299                                                                         /*}}}*/
 300 // FTPConn::ReadLine - Read a line from the server                      /*{{{*/
 301 // ---------------------------------------------------------------------
 302 /* This performs a very simple buffered read. */
 303 bool FTPConn::ReadLine(string &Text)
 304 {
 305    if (ServerFd == -1)
 306       return false;
 307
 308    // Suck in a line
 309    while (Len < sizeof(Buffer))
 310    {
 311       // Scan the buffer for a new line
 312       for (unsigned int I = 0; I != Len; I++)
 313       {
 314          // Escape some special chars
 315          if (Buffer[I] == 0)
 316             Buffer[I] = '?';
 317
 318          // End of line?
 319          if (Buffer[I] != '\n')
 320             continue;
 321
 322          I++;
 323          Text = string(Buffer,I);
 324          memmove(Buffer,Buffer+I,Len - I);
 325          Len -= I;
 326          return true;
 327       }
 328
 329       // Wait for some data..
 330       if (WaitFd(ServerFd,false,TimeOut) == false)
 331       {
 332          Close();
 333          return _error->Error(_("Connection timeout"));
 334       }
 335
 336       // Suck it back
 337       int Res = read(ServerFd,Buffer + Len,sizeof(Buffer) - Len);
 338       if (Res == 0)
 339          _error->Error(_("Server closed the connection"));
 340       if (Res <= 0)
 341       {
 342          _error->Errno("read",_("Read error"));
 343          Close();
 344          return false;
 345       }
 346       Len += Res;
 347    }
 348
 349    return _error->Error(_("A response overflowed the buffer."));
 350 }
 351                                                                         /*}}}*/
 352 // FTPConn::ReadResp - Read a full response from the server             /*{{{*/
 353 // ---------------------------------------------------------------------
 354 /* This reads a reply code from the server, it handles both p */
 355 bool FTPConn::ReadResp(unsigned int &Ret,string &Text)
 356 {
 357    // Grab the first line of the response
 358    string Msg;
 359    if (ReadLine(Msg) == false)
 360        return false;
 361
 362    // Get the ID code
 363    char *End;
 364    Ret = strtol(Msg.c_str(),&End,10);
 365    if (End - Msg.c_str() != 3)
 366       return _error->Error(_("Protocol corruption"));
 367
 368    // All done ?
 369    Text = Msg.c_str()+4;
 370    if (*End == ' ')
 371    {
 372       if (Debug == true)
 373          cerr << "<- '" << QuoteString(Text,"") << "'" << endl;
 374       return true;
 375    }
 376
 377    if (*End != '-')
 378       return _error->Error(_("Protocol corruption"));
 379
 380    /* Okay, here we do the continued message trick. This is foolish, but
 381       proftpd follows the protocol as specified and wu-ftpd doesn't, so
 382       we filter. I wonder how many clients break if you use proftpd and
 383       put a '- in the 3rd spot in the message? */
 384    char Leader[4];
 385    strncpy(Leader,Msg.c_str(),3);
 386    Leader[3] = 0;
 387    while (ReadLine(Msg) == true)
 388    {
 389       // Short, it must be using RFC continuation..
 390       if (Msg.length() < 4)
 391       {
 392          Text += Msg;
 393          continue;
 394       }
 395
 396       // Oops, finished
 397       if (strncmp(Msg.c_str(),Leader,3) == 0 && Msg[3] == ' ')
 398       {
 399          Text += Msg.c_str()+4;
 400          break;
 401       }
 402
 403       // This message has the wu-ftpd style reply code prefixed
 404       if (strncmp(Msg.c_str(),Leader,3) == 0 && Msg[3] == '-')
 405       {
 406          Text += Msg.c_str()+4;
 407          continue;
 408       }
 409
 410       // Must be RFC style prefixing
 411       Text += Msg;
 412    }
 413
 414    if (Debug == true && _error->PendingError() == false)
 415       cerr << "<- '" << QuoteString(Text,"") << "'" << endl;
 416
 417    return !_error->PendingError();
 418 }
 419                                                                         /*}}}*/
 420 // FTPConn::WriteMsg - Send a message to the server                     /*{{{*/
 421 // ---------------------------------------------------------------------
 422 /* Simple printf like function.. */
 423 bool FTPConn::WriteMsg(unsigned int &Ret,string &Text,const char *Fmt,...)
 424 {
 425    va_list args;
 426    va_start(args,Fmt);
 427
 428    // sprintf the description
 429    char S[400];
 430    vsnprintf(S,sizeof(S) - 4,Fmt,args);
 431    strcat(S,"\r\n");
 432
 433    if (Debug == true)
 434       cerr << "-> '" << QuoteString(S,"") << "'" << endl;
 435
 436    // Send it off
 437    unsigned long Len = strlen(S);
 438    unsigned long Start = 0;
 439    while (Len != 0)
 440    {
 441       if (WaitFd(ServerFd,true,TimeOut) == false)
 442       {
 443          Close();
 444          return _error->Error(_("Connection timeout"));
 445       }
 446
 447       int Res = write(ServerFd,S + Start,Len);
 448       if (Res <= 0)
 449       {
 450          _error->Errno("write",_("Write error"));
 451          Close();
 452          return false;
 453       }
 454
 455       Len -= Res;
 456       Start += Res;
 457    }
 458
 459    return ReadResp(Ret,Text);
 460 }
 461                                                                         /*}}}*/
 462 // FTPConn::GoPasv - Enter Passive mode                                 /*{{{*/
 463 // ---------------------------------------------------------------------
 464 /* Try to enter passive mode, the return code does not indicate if passive
 465    mode could or could not be established, only if there was a fatal error.
 466    We have to enter passive mode every time we make a data connection :| */
 467 bool FTPConn::GoPasv()
 468 {
 469    /* The PASV command only works on IPv4 sockets, even though it could
 470       in theory suppory IPv6 via an all zeros reply */
 471    if (((struct sockaddr *)&PeerAddr)->sa_family != AF_INET ||
 472        ForceExtended == true)
 473       return ExtGoPasv();
 474
 475    if (PasvAddr != 0)
 476       freeaddrinfo(PasvAddr);
 477    PasvAddr = 0;
 478
 479    // Try to enable pasv mode
 480    unsigned int Tag;
 481    string Msg;
 482    if (WriteMsg(Tag,Msg,"PASV") == false)
 483       return false;
 484
 485    // Unsupported function
 486    string::size_type Pos = Msg.find('(');
 487    if (Tag >= 400 || Pos == string::npos)
 488       return true;
 489
 490    // Scan it
 491    unsigned a0,a1,a2,a3,p0,p1;
 492    if (sscanf(Msg.c_str() + Pos,"(%u,%u,%u,%u,%u,%u)",&a0,&a1,&a2,&a3,&p0,&p1) != 6)
 493       return true;
 494
 495    /* Some evil servers return 0 to mean their addr. We can actually speak
 496       to these servers natively using IPv6 */
 497    if (a0 == 0 && a1 == 0 && a2 == 0 && a3 == 0)
 498    {
 499       // Get the IP in text form
 500       char Name[NI_MAXHOST];
 501       char Service[NI_MAXSERV];
 502       getnameinfo((struct sockaddr *)&PeerAddr,PeerAddrLen,
 503                   Name,sizeof(Name),Service,sizeof(Service),
 504                   NI_NUMERICHOST|NI_NUMERICSERV);
 505
 506       struct addrinfo Hints;
 507       memset(&Hints,0,sizeof(Hints));
 508       Hints.ai_socktype = SOCK_STREAM;
 509       Hints.ai_family = ((struct sockaddr *)&PeerAddr)->sa_family;
 510       Hints.ai_flags |= AI_NUMERICHOST;
 511
 512       // Get a new passive address.
 513       char Port[100];
 514       snprintf(Port,sizeof(Port),"%u",(p0 << 8) + p1);
 515       if (getaddrinfo(Name,Port,&Hints,&PasvAddr) != 0)
 516          return true;
 517       return true;
 518    }
 519
 520    struct addrinfo Hints;
 521    memset(&Hints,0,sizeof(Hints));
 522    Hints.ai_socktype = SOCK_STREAM;
 523    Hints.ai_family = AF_INET;
 524    Hints.ai_flags |= AI_NUMERICHOST;
 525
 526    // Get a new passive address.
 527    char Port[100];
 528    snprintf(Port,sizeof(Port),"%u",(p0 << 8) + p1);
 529    char Name[100];
 530    snprintf(Name,sizeof(Name),"%u.%u.%u.%u",a0,a1,a2,a3);
 531    if (getaddrinfo(Name,Port,&Hints,&PasvAddr) != 0)
 532       return true;
 533    return true;
 534 }
 535                                                                         /*}}}*/
 536 // FTPConn::ExtGoPasv - Enter Extended Passive mode                     /*{{{*/
 537 // ---------------------------------------------------------------------
 538 /* Try to enter extended passive mode. See GoPasv above and RFC 2428 */
 539 bool FTPConn::ExtGoPasv()
 540 {
 541    if (PasvAddr != 0)
 542       freeaddrinfo(PasvAddr);
 543    PasvAddr = 0;
 544
 545    // Try to enable pasv mode
 546    unsigned int Tag;
 547    string Msg;
 548    if (WriteMsg(Tag,Msg,"EPSV") == false)
 549       return false;
 550
 551    // Unsupported function
 552    string::size_type Pos = Msg.find('(');
 553    if (Tag >= 400 || Pos == string::npos)
 554       return true;
 555
 556    // Scan it
 557    string::const_iterator List[4];
 558    unsigned Count = 0;
 559    Pos++;
 560    for (string::const_iterator I = Msg.begin() + Pos; I < Msg.end(); I++)
 561    {
 562       if (*I != Msg[Pos])
 563          continue;
 564       if (Count >= 4)
 565          return true;
 566       List[Count++] = I;
 567    }
 568    if (Count != 4)
 569       return true;
 570
 571    // Break it up ..
 572    unsigned long Proto = 0;
 573    unsigned long Port = 0;
 574    string IP;
 575    IP = string(List[1]+1,List[2]);
 576    Port = atoi(string(List[2]+1,List[3]).c_str());
 577    if (IP.empty() == false)
 578       Proto = atoi(string(List[0]+1,List[1]).c_str());
 579
 580    if (Port == 0)
 581       return false;
 582
 583    // String version of the port
 584    char PStr[100];
 585    snprintf(PStr,sizeof(PStr),"%lu",Port);
 586
 587    // Get the IP in text form
 588    struct addrinfo Hints;
 589    memset(&Hints,0,sizeof(Hints));
 590    Hints.ai_socktype = SOCK_STREAM;
 591    Hints.ai_flags |= AI_NUMERICHOST;
 592
 593    /* The RFC defined case, connect to the old IP/protocol using the
 594       new port. */
 595    if (IP.empty() == true)
 596    {
 597       // Get the IP in text form
 598       char Name[NI_MAXHOST];
 599       char Service[NI_MAXSERV];
 600       getnameinfo((struct sockaddr *)&PeerAddr,PeerAddrLen,
 601                   Name,sizeof(Name),Service,sizeof(Service),
 602                   NI_NUMERICHOST|NI_NUMERICSERV);
 603       IP = Name;
 604       Hints.ai_family = ((struct sockaddr *)&PeerAddr)->sa_family;
 605    }
 606    else
 607    {
 608       // Get the family..
 609       Hints.ai_family = 0;
 610       for (unsigned J = 0; AFMap[J].Family != 0; J++)
 611          if (AFMap[J].IETFFamily == Proto)
 612             Hints.ai_family = AFMap[J].Family;
 613       if (Hints.ai_family == 0)
 614          return true;
 615    }
 616
 617    // Get a new passive address.
 618    int Res;
 619    if ((Res = getaddrinfo(IP.c_str(),PStr,&Hints,&PasvAddr)) != 0)
 620       return true;
 621
 622    return true;
 623 }
 624                                                                         /*}}}*/
 625 // FTPConn::Size - Return the size of a file                            /*{{{*/
 626 // ---------------------------------------------------------------------
 627 /* Grab the file size from the server, 0 means no size or empty file */
 628 bool FTPConn::Size(const char *Path,unsigned long &Size)
 629 {
 630    // Query the size
 631    unsigned int Tag;
 632    string Msg;
 633    Size = 0;
 634    if (WriteMsg(Tag,Msg,"SIZE %s",Path) == false)
 635       return false;
 636
 637    char *End;
 638    Size = strtol(Msg.c_str(),&End,10);
 639    if (Tag >= 400 || End == Msg.c_str())
 640       Size = 0;
 641    return true;
 642 }
 643                                                                         /*}}}*/
 644 // FTPConn::ModTime - Return the modification time of the file          /*{{{*/
 645 // ---------------------------------------------------------------------
 646 /* Like Size no error is returned if the command is not supported. If the
 647    command fails then time is set to the current time of day to fool
 648    date checks. */
 649 bool FTPConn::ModTime(const char *Path, time_t &Time)
 650 {
 651    Time = time(&Time);
 652
 653    // Query the mod time
 654    unsigned int Tag;
 655    string Msg;
 656    if (WriteMsg(Tag,Msg,"MDTM %s",Path) == false)
 657       return false;
 658    if (Tag >= 400 || Msg.empty() == true || isdigit(Msg[0]) == 0)
 659       return true;
 660
 661    // Parse it
 662    StrToTime(Msg,Time);
 663    return true;
 664 }
 665                                                                         /*}}}*/
 666 // FTPConn::CreateDataFd - Get a data connection                        /*{{{*/
 667 // ---------------------------------------------------------------------
 668 /* Create the data connection. Call FinalizeDataFd after this though.. */
 669 bool FTPConn::CreateDataFd()
 670 {
 671    close(DataFd);
 672    DataFd = -1;
 673
 674    // Attempt to enter passive mode.
 675    if (TryPassive == true)
 676    {
 677       if (GoPasv() == false)
 678          return false;
 679
 680       // Oops, didn't work out, don't bother trying again.
 681       if (PasvAddr == 0)
 682          TryPassive = false;
 683    }
 684
 685    // Passive mode?
 686    if (PasvAddr != 0)
 687    {
 688       // Get a socket
 689       if ((DataFd = socket(PasvAddr->ai_family,PasvAddr->ai_socktype,
 690                            PasvAddr->ai_protocol)) < 0)
 691          return _error->Errno("socket",_("Could not create a socket"));
 692
 693       // Connect to the server
 694       SetNonBlock(DataFd,true);
 695       if (connect(DataFd,PasvAddr->ai_addr,PasvAddr->ai_addrlen) < 0 &&
 696           errno != EINPROGRESS)
 697          return _error->Errno("socket",_("Could not create a socket"));
 698
 699       /* This implements a timeout for connect by opening the connection
 700          nonblocking */
 701       if (WaitFd(DataFd,true,TimeOut) == false)
 702          return _error->Error(_("Could not connect data socket, connection timed out"));
 703       unsigned int Err;
 704       unsigned int Len = sizeof(Err);
 705       if (getsockopt(DataFd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0)
 706          return _error->Errno("getsockopt",_("Failed"));
 707       if (Err != 0)
 708          return _error->Error(_("Could not connect passive socket."));
 709
 710       return true;
 711    }
 712
 713    // Port mode :<
 714    close(DataListenFd);
 715    DataListenFd = -1;
 716
 717    // Get the information for a listening socket.
 718    struct addrinfo *BindAddr = 0;
 719    struct addrinfo Hints;
 720    memset(&Hints,0,sizeof(Hints));
 721    Hints.ai_socktype = SOCK_STREAM;
 722    Hints.ai_flags |= AI_PASSIVE;
 723    Hints.ai_family = ((struct sockaddr *)&ServerAddr)->sa_family;
 724    int Res;
 725    if ((Res = getaddrinfo(0,"0",&Hints,&BindAddr)) != 0)
 726       return _error->Error(_("getaddrinfo was unable to get a listening socket"));
 727
 728    // Construct the socket
 729    if ((DataListenFd = socket(BindAddr->ai_family,BindAddr->ai_socktype,
 730                               BindAddr->ai_protocol)) < 0)
 731    {
 732       freeaddrinfo(BindAddr);
 733       return _error->Errno("socket",_("Could not create a socket"));
 734    }
 735
 736    // Bind and listen
 737    if (bind(DataListenFd,BindAddr->ai_addr,BindAddr->ai_addrlen) < 0)
 738    {
 739       freeaddrinfo(BindAddr);
 740       return _error->Errno("bind",_("Could not bind a socket"));
 741    }
 742    freeaddrinfo(BindAddr);
 743    if (listen(DataListenFd,1) < 0)
 744       return _error->Errno("listen",_("Could not listen on the socket"));
 745    SetNonBlock(DataListenFd,true);
 746
 747    // Determine the name to send to the remote
 748    struct sockaddr_storage Addr;
 749    socklen_t AddrLen = sizeof(Addr);
 750    if (getsockname(DataListenFd,(sockaddr *)&Addr,&AddrLen) < 0)
 751       return _error->Errno("getsockname",_("Could not determine the socket's name"));
 752
 753
 754    // Reverse the address. We need the server address and the data port.
 755    char Name[NI_MAXHOST];
 756    char Service[NI_MAXSERV];
 757    char Service2[NI_MAXSERV];
 758    getnameinfo((struct sockaddr *)&Addr,AddrLen,
 759                Name,sizeof(Name),Service,sizeof(Service),
 760                NI_NUMERICHOST|NI_NUMERICSERV);
 761    getnameinfo((struct sockaddr *)&ServerAddr,ServerAddrLen,
 762                Name,sizeof(Name),Service2,sizeof(Service2),
 763                NI_NUMERICHOST|NI_NUMERICSERV);
 764
 765    // Send off an IPv4 address in the old port format
 766    if (((struct sockaddr *)&Addr)->sa_family == AF_INET &&
 767        ForceExtended == false)
 768    {
 769       // Convert the dots in the quad into commas
 770       for (char *I = Name; *I != 0; I++)
 771          if (*I == '.')
 772             *I = ',';
 773       unsigned long Port = atoi(Service);
 774
 775       // Send the port command
 776       unsigned int Tag;
 777       string Msg;
 778       if (WriteMsg(Tag,Msg,"PORT %s,%d,%d",
 779                    Name,
 780                    (int)(Port >> 8) & 0xff, (int)(Port & 0xff)) == false)
 781          return false;
 782       if (Tag >= 400)
 783          return _error->Error(_("Unable to send PORT command"));
 784       return true;
 785    }
 786
 787    // Construct an EPRT command
 788    unsigned Proto = 0;
 789    for (unsigned J = 0; AFMap[J].Family != 0; J++)
 790       if (AFMap[J].Family == ((struct sockaddr *)&Addr)->sa_family)
 791          Proto = AFMap[J].IETFFamily;
 792    if (Proto == 0)
 793       return _error->Error(_("Unknown address family %u (AF_*)"),
 794                            ((struct sockaddr *)&Addr)->sa_family);
 795
 796    // Send the EPRT command
 797    unsigned int Tag;
 798    string Msg;
 799    if (WriteMsg(Tag,Msg,"EPRT |%u|%s|%s|",Proto,Name,Service) == false)
 800       return false;
 801    if (Tag >= 400)
 802       return _error->Error(_("EPRT failed, server said: %s"),Msg.c_str());
 803    return true;
 804 }
 805                                                                         /*}}}*/
 806 // FTPConn::Finalize - Complete the Data connection                     /*{{{*/
 807 // ---------------------------------------------------------------------
 808 /* If the connection is in port mode this waits for the other end to hook
 809    up to us. */
 810 bool FTPConn::Finalize()
 811 {
 812    // Passive mode? Do nothing
 813    if (PasvAddr != 0)
 814       return true;
 815
 816    // Close any old socket..
 817    close(DataFd);
 818    DataFd = -1;
 819
 820    // Wait for someone to connect..
 821    if (WaitFd(DataListenFd,false,TimeOut) == false)
 822       return _error->Error(_("Data socket connect timed out"));
 823
 824    // Accept the connection
 825    struct sockaddr_in Addr;
 826    socklen_t Len = sizeof(Addr);
 827    DataFd = accept(DataListenFd,(struct sockaddr *)&Addr,&Len);
 828    if (DataFd < 0)
 829       return _error->Errno("accept",_("Unable to accept connection"));
 830
 831    close(DataListenFd);
 832    DataListenFd = -1;
 833
 834    return true;
 835 }
 836                                                                         /*}}}*/
 837 // FTPConn::Get - Get a file                                            /*{{{*/
 838 // ---------------------------------------------------------------------
 839 /* This opens a data connection, sends REST and RETR and then
 840    transfers the file over. */
 841 bool FTPConn::Get(const char *Path,FileFd &To,unsigned long Resume,
 842                   Hashes &Hash,bool &Missing)
 843 {
 844    Missing = false;
 845    if (CreateDataFd() == false)
 846       return false;
 847
 848    unsigned int Tag;
 849    string Msg;
 850    if (Resume != 0)
 851    {
 852       if (WriteMsg(Tag,Msg,"REST %u",Resume) == false)
 853          return false;
 854       if (Tag >= 400)
 855          Resume = 0;
 856    }
 857
 858    if (To.Truncate(Resume) == false)
 859       return false;
 860
 861    if (To.Seek(0) == false)
 862       return false;
 863
 864    if (Resume != 0)
 865    {
 866       if (Hash.AddFD(To.Fd(),Resume) == false)
 867       {
 868          _error->Errno("read",_("Problem hashing file"));
 869          return false;
 870       }
 871    }
 872
 873    // Send the get command
 874    if (WriteMsg(Tag,Msg,"RETR %s",Path) == false)
 875       return false;
 876
 877    if (Tag >= 400)
 878    {
 879       if (Tag == 550)
 880          Missing = true;
 881       return _error->Error(_("Unable to fetch file, server said '%s'"),Msg.c_str());
 882    }
 883
 884    // Finish off the data connection
 885    if (Finalize() == false)
 886       return false;
 887
 888    // Copy loop
 889    unsigned char Buffer[4096];
 890    while (1)
 891    {
 892       // Wait for some data..
 893       if (WaitFd(DataFd,false,TimeOut) == false)
 894       {
 895          Close();
 896          return _error->Error(_("Data socket timed out"));
 897       }
 898
 899       // Read the data..
 900       int Res = read(DataFd,Buffer,sizeof(Buffer));
 901       if (Res == 0)
 902          break;
 903       if (Res < 0)
 904       {
 905          if (errno == EAGAIN)
 906             continue;
 907          break;
 908       }
 909
 910       Hash.Add(Buffer,Res);
 911       if (To.Write(Buffer,Res) == false)
 912       {
 913          Close();
 914          return false;
 915       }
 916    }
 917
 918    // All done
 919    close(DataFd);
 920    DataFd = -1;
 921
 922    // Read the closing message from the server
 923    if (ReadResp(Tag,Msg) == false)
 924       return false;
 925    if (Tag >= 400)
 926       return _error->Error(_("Data transfer failed, server said '%s'"),Msg.c_str());
 927    return true;
 928 }
 929                                                                         /*}}}*/
 930
 931 // FtpMethod::FtpMethod - Constructor                                   /*{{{*/
 932 // ---------------------------------------------------------------------
 933 /* */
 934 FtpMethod::FtpMethod() : pkgAcqMethod("1.0",SendConfig)
 935 {
 936    signal(SIGTERM,SigTerm);
 937    signal(SIGINT,SigTerm);
 938
 939    Server = 0;
 940    FailFd = -1;
 941 }
 942                                                                         /*}}}*/
 943 // FtpMethod::SigTerm - Handle a fatal signal                           /*{{{*/
 944 // ---------------------------------------------------------------------
 945 /* This closes and timestamps the open file. This is neccessary to get
 946    resume behavoir on user abort */
 947 void FtpMethod::SigTerm(int)
 948 {
 949    if (FailFd == -1)
 950       _exit(100);
 951    close(FailFd);
 952
 953    // Timestamp
 954    struct utimbuf UBuf;
 955    UBuf.actime = FailTime;
 956    UBuf.modtime = FailTime;
 957    utime(FailFile.c_str(),&UBuf);
 958
 959    _exit(100);
 960 }
 961                                                                         /*}}}*/
 962 // FtpMethod::Configuration - Handle a configuration message            /*{{{*/
 963 // ---------------------------------------------------------------------
 964 /* We stash the desired pipeline depth */
 965 bool FtpMethod::Configuration(string Message)
 966 {
 967    if (pkgAcqMethod::Configuration(Message) == false)
 968       return false;
 969
 970    TimeOut = _config->FindI("Acquire::Ftp::Timeout",TimeOut);
 971    return true;
 972 }
 973                                                                         /*}}}*/
 974 // FtpMethod::Fetch - Fetch a file                                      /*{{{*/
 975 // ---------------------------------------------------------------------
 976 /* Fetch a single file, called by the base class..  */
 977 bool FtpMethod::Fetch(FetchItem *Itm)
 978 {
 979    URI Get = Itm->Uri;
 980    const char *File = Get.Path.c_str();
 981    FetchResult Res;
 982    Res.Filename = Itm->DestFile;
 983    Res.IMSHit = false;
 984
 985    // Connect to the server
 986    if (Server == 0 || Server->Comp(Get) == false)
 987    {
 988       delete Server;
 989       Server = new FTPConn(Get);
 990    }
 991
 992    // Could not connect is a transient error..
 993    if (Server->Open(this) == false)
 994    {
 995       Server->Close();
 996       Fail(true);
 997       return true;
 998    }
 999
1000    // Get the files information
1001    Status(_("Query"));
1002    unsigned long Size;
1003    if (Server->Size(File,Size) == false ||
1004        Server->ModTime(File,FailTime) == false)
1005    {
1006       Fail(true);
1007       return true;
1008    }
1009    Res.Size = Size;
1010
1011    // See if it is an IMS hit
1012    if (Itm->LastModified == FailTime)
1013    {
1014       Res.Size = 0;
1015       Res.IMSHit = true;
1016       URIDone(Res);
1017       return true;
1018    }
1019
1020    // See if the file exists
1021    struct stat Buf;
1022    if (stat(Itm->DestFile.c_str(),&Buf) == 0)
1023    {
1024       if (Size == (unsigned)Buf.st_size && FailTime == Buf.st_mtime)
1025       {
1026          Res.Size = Buf.st_size;
1027          Res.LastModified = Buf.st_mtime;
1028          Res.ResumePoint = Buf.st_size;
1029          URIDone(Res);
1030          return true;
1031       }
1032
1033       // Resume?
1034       if (FailTime == Buf.st_mtime && Size > (unsigned)Buf.st_size)
1035          Res.ResumePoint = Buf.st_size;
1036    }
1037
1038    // Open the file
1039    Hashes Hash;
1040    {
1041       FileFd Fd(Itm->DestFile,FileFd::WriteAny);
1042       if (_error->PendingError() == true)
1043          return false;
1044
1045       URIStart(Res);
1046
1047       FailFile = Itm->DestFile;
1048       FailFile.c_str();   // Make sure we dont do a malloc in the signal handler
1049       FailFd = Fd.Fd();
1050
1051       bool Missing;
1052       if (Server->Get(File,Fd,Res.ResumePoint,Hash,Missing) == false)
1053       {
1054          Fd.Close();
1055
1056          // Timestamp
1057          struct utimbuf UBuf;
1058          UBuf.actime = FailTime;
1059          UBuf.modtime = FailTime;
1060          utime(FailFile.c_str(),&UBuf);
1061
1062          // If the file is missing we hard fail and delete the destfile
1063          // otherwise transient fail
1064          if (Missing == true) {
1065             unlink(FailFile.c_str());
1066             return false;
1067          }
1068          Fail(true);
1069          return true;
1070       }
1071
1072       Res.Size = Fd.Size();
1073    }
1074
1075    Res.LastModified = FailTime;
1076    Res.TakeHashes(Hash);
1077
1078    // Timestamp
1079    struct utimbuf UBuf;
1080    UBuf.actime = FailTime;
1081    UBuf.modtime = FailTime;
1082    utime(Queue->DestFile.c_str(),&UBuf);
1083    FailFd = -1;
1084
1085    URIDone(Res);
1086
1087    return true;
1088 }
1089                                                                         /*}}}*/
1090
1091 int main(int argc,const char *argv[])
1092 {
1093    struct nlist nl[2];
1094    memset(nl, 0, sizeof(nl));
1095    nl[0].n_un.n_name = (char *) "_useMDNSResponder";
1096    nlist("/usr/lib/libc.dylib", nl);
1097    if (nl[0].n_type != N_UNDF)
1098        *(int *) nl[0].n_value = 0;
1099
1100    setlocale(LC_ALL, "");
1101
1102    /* See if we should be come the http client - we do this for http
1103       proxy urls */
1104    if (getenv("ftp_proxy") != 0)
1105    {
1106       URI Proxy = string(getenv("ftp_proxy"));
1107
1108       // Run the HTTP method
1109       if (Proxy.Access == "http")
1110       {
1111          // Copy over the environment setting
1112          char S[300];
1113          snprintf(S,sizeof(S),"http_proxy=%s",getenv("ftp_proxy"));
1114          putenv(S);
1115          putenv("no_proxy=");
1116
1117          // Run the http method
1118          string Path = flNotFile(argv[0]) + "http";
1119          execl(Path.c_str(),Path.c_str(),(char *)NULL);
1120          cerr << _("Unable to invoke ") << Path << endl;
1121          exit(100);
1122       }
1123    }
1124
1125    FtpMethod Mth;
1126
1127    return Mth.Run();
1128 }