src/clients/FtpGateway.cc

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /* DEBUG: section 09    File Transfer Protocol (FTP) */
  10
  11 #include "squid.h"
  12 #include "acl/FilledChecklist.h"
  13 #include "clients/forward.h"
  14 #include "clients/FtpClient.h"
  15 #include "comm.h"
  16 #include "comm/ConnOpener.h"
  17 #include "comm/Read.h"
  18 #include "comm/TcpAcceptor.h"
  19 #include "CommCalls.h"
  20 #include "compat/strtoll.h"
  21 #include "errorpage.h"
  22 #include "fd.h"
  23 #include "fde.h"
  24 #include "FwdState.h"
  25 #include "html_quote.h"
  26 #include "HttpHdrContRange.h"
  27 #include "HttpHeader.h"
  28 #include "HttpHeaderRange.h"
  29 #include "HttpReply.h"
  30 #include "HttpRequest.h"
  31 #include "ip/tools.h"
  32 #include "MemBuf.h"
  33 #include "mime.h"
  34 #include "rfc1738.h"
  35 #include "SquidConfig.h"
  36 #include "SquidString.h"
  37 #include "SquidTime.h"
  38 #include "StatCounters.h"
  39 #include "Store.h"
  40 #include "tools.h"
  41 #include "URL.h"
  42 #include "util.h"
  43 #include "wordlist.h"
  44
  45 #if USE_DELAY_POOLS
  46 #include "DelayPools.h"
  47 #include "MemObject.h"
  48 #endif
  49
  50 #include <cerrno>
  51
  52 namespace Ftp
  53 {
  54
  55 struct GatewayFlags {
  56
  57     /* passive mode */
  58     bool pasv_supported;  ///< PASV command is allowed
  59     bool epsv_all_sent;   ///< EPSV ALL has been used. Must abort on failures.
  60     bool pasv_only;
  61     bool pasv_failed;  // was FwdState::flags.ftp_pasv_failed
  62
  63     /* authentication */
  64     bool authenticated;         ///< authentication success
  65     bool tried_auth_anonymous;  ///< auth has tried to use anonymous credentials already.
  66     bool tried_auth_nopass;     ///< auth tried username with no password already.
  67
  68     /* other */
  69     bool isdir;
  70     bool skip_whitespace;
  71     bool rest_supported;
  72     bool http_header_sent;
  73     bool tried_nlst;
  74     bool need_base_href;
  75     bool dir_slash;
  76     bool root_dir;
  77     bool no_dotdot;
  78     bool binary;
  79     bool try_slash_hack;
  80     bool put;
  81     bool put_mkdir;
  82     bool listformat_unknown;
  83     bool listing;
  84     bool completed_forwarding;
  85 };
  86
  87 class Gateway;
  88 typedef void (StateMethod)(Ftp::Gateway *);
  89
  90 /// FTP Gateway: An FTP client that takes an HTTP request with an ftp:// URI,
  91 /// converts it into one or more FTP commands, and then
  92 /// converts one or more FTP responses into the final HTTP response.
  93 class Gateway : public Ftp::Client
  94 {
  95     CBDATA_CLASS(Gateway);
  96
  97 public:
  98     Gateway(FwdState *);
  99     virtual ~Gateway();
 100     char user[MAX_URL];
 101     char password[MAX_URL];
 102     int password_url;
 103     char *reply_hdr;
 104     int reply_hdr_state;
 105     String clean_url;
 106     String title_url;
 107     String base_href;
 108     int conn_att;
 109     int login_att;
 110     time_t mdtm;
 111     int64_t theSize;
 112     wordlist *pathcomps;
 113     char *filepath;
 114     char *dirpath;
 115     int64_t restart_offset;
 116     char *proxy_host;
 117     size_t list_width;
 118     String cwd_message;
 119     char *old_filepath;
 120     char typecode;
 121     MemBuf listing;     ///< FTP directory listing in HTML format.
 122
 123     GatewayFlags flags;
 124
 125 public:
 126     // these should all be private
 127     virtual void start();
 128     virtual Http::StatusCode failedHttpStatus(err_type &error);
 129     int restartable();
 130     void appendSuccessHeader();
 131     void hackShortcut(StateMethod *nextState);
 132     void unhack();
 133     void readStor();
 134     void parseListing();
 135     MemBuf *htmlifyListEntry(const char *line);
 136     void completedListing(void);
 137
 138     /// create a data channel acceptor and start listening.
 139     void listenForDataChannel(const Comm::ConnectionPointer &conn);
 140
 141     int checkAuth(const HttpHeader * req_hdr);
 142     void checkUrlpath();
 143     void buildTitleUrl();
 144     void writeReplyBody(const char *, size_t len);
 145     void printfReplyBody(const char *fmt, ...);
 146     virtual void completeForwarding();
 147     void processHeadResponse();
 148     void processReplyBody();
 149     void setCurrentOffset(int64_t offset) { currentOffset = offset; }
 150     int64_t getCurrentOffset() const { return currentOffset; }
 151
 152     virtual void dataChannelConnected(const CommConnectCbParams &io);
 153     static PF ftpDataWrite;
 154     virtual void timeout(const CommTimeoutCbParams &io);
 155     void ftpAcceptDataConnection(const CommAcceptCbParams &io);
 156
 157     static HttpReply *ftpAuthRequired(HttpRequest * request, const char *realm);
 158     const char *ftpRealm(void);
 159     void loginFailed(void);
 160
 161     virtual void haveParsedReplyHeaders();
 162
 163     virtual bool haveControlChannel(const char *caller_name) const;
 164
 165 protected:
 166     virtual void handleControlReply();
 167     virtual void dataClosed(const CommCloseCbParams &io);
 168
 169 private:
 170     virtual bool mayReadVirginReplyBody() const;
 171     // BodyConsumer for HTTP: consume request body.
 172     virtual void handleRequestBodyProducerAborted();
 173
 174     void loginParser(const SBuf &login, bool escaped);
 175 };
 176
 177 } // namespace Ftp
 178
 179 typedef Ftp::StateMethod FTPSM; // to avoid lots of non-changes
 180
 181 CBDATA_NAMESPACED_CLASS_INIT(Ftp, Gateway);
 182
 183 typedef struct {
 184     char type;
 185     int64_t size;
 186     char *date;
 187     char *name;
 188     char *showname;
 189     char *link;
 190 } ftpListParts;
 191
 192 #define CTRL_BUFLEN 1024
 193 static char cbuf[CTRL_BUFLEN];
 194
 195 /*
 196  * State machine functions
 197  * send == state transition
 198  * read == wait for response, and select next state transition
 199  * other == Transition logic
 200  */
 201 static FTPSM ftpReadWelcome;
 202 static FTPSM ftpSendUser;
 203 static FTPSM ftpReadUser;
 204 static FTPSM ftpSendPass;
 205 static FTPSM ftpReadPass;
 206 static FTPSM ftpSendType;
 207 static FTPSM ftpReadType;
 208 static FTPSM ftpSendMdtm;
 209 static FTPSM ftpReadMdtm;
 210 static FTPSM ftpSendSize;
 211 static FTPSM ftpReadSize;
 212 static FTPSM ftpSendEPRT;
 213 static FTPSM ftpReadEPRT;
 214 static FTPSM ftpSendPORT;
 215 static FTPSM ftpReadPORT;
 216 static FTPSM ftpSendPassive;
 217 static FTPSM ftpReadEPSV;
 218 static FTPSM ftpReadPasv;
 219 static FTPSM ftpTraverseDirectory;
 220 static FTPSM ftpListDir;
 221 static FTPSM ftpGetFile;
 222 static FTPSM ftpSendCwd;
 223 static FTPSM ftpReadCwd;
 224 static FTPSM ftpRestOrList;
 225 static FTPSM ftpSendList;
 226 static FTPSM ftpSendNlst;
 227 static FTPSM ftpReadList;
 228 static FTPSM ftpSendRest;
 229 static FTPSM ftpReadRest;
 230 static FTPSM ftpSendRetr;
 231 static FTPSM ftpReadRetr;
 232 static FTPSM ftpReadTransferDone;
 233 static FTPSM ftpSendStor;
 234 static FTPSM ftpReadStor;
 235 static FTPSM ftpWriteTransferDone;
 236 static FTPSM ftpSendReply;
 237 static FTPSM ftpSendMkdir;
 238 static FTPSM ftpReadMkdir;
 239 static FTPSM ftpFail;
 240 static FTPSM ftpSendQuit;
 241 static FTPSM ftpReadQuit;
 242
 243 /************************************************
 244 ** Debugs Levels used here                     **
 245 *************************************************
 246 0   CRITICAL Events
 247 1   IMPORTANT Events
 248     Protocol and Transmission failures.
 249 2   FTP Protocol Chatter
 250 3   Logic Flows
 251 4   Data Parsing Flows
 252 5   Data Dumps
 253 7   ??
 254 ************************************************/
 255
 256 /************************************************
 257 ** State Machine Description (excluding hacks) **
 258 *************************************************
 259 From            To
 260 ---------------------------------------
 261 Welcome         User
 262 User            Pass
 263 Pass            Type
 264 Type            TraverseDirectory / GetFile
 265 TraverseDirectory   Cwd / GetFile / ListDir
 266 Cwd         TraverseDirectory / Mkdir
 267 GetFile         Mdtm
 268 Mdtm            Size
 269 Size            Epsv
 270 ListDir         Epsv
 271 Epsv            FileOrList
 272 FileOrList      Rest / Retr / Nlst / List / Mkdir (PUT /xxx;type=d)
 273 Rest            Retr
 274 Retr / Nlst / List  DataRead* (on datachannel)
 275 DataRead*       ReadTransferDone
 276 ReadTransferDone    DataTransferDone
 277 Stor            DataWrite* (on datachannel)
 278 DataWrite*      RequestPutBody** (from client)
 279 RequestPutBody**    DataWrite* / WriteTransferDone
 280 WriteTransferDone   DataTransferDone
 281 DataTransferDone    Quit
 282 Quit            -
 283 ************************************************/
 284
 285 FTPSM *FTP_SM_FUNCS[] = {
 286     ftpReadWelcome,     /* BEGIN */
 287     ftpReadUser,        /* SENT_USER */
 288     ftpReadPass,        /* SENT_PASS */
 289     ftpReadType,        /* SENT_TYPE */
 290     ftpReadMdtm,        /* SENT_MDTM */
 291     ftpReadSize,        /* SENT_SIZE */
 292     ftpReadEPRT,        /* SENT_EPRT */
 293     ftpReadPORT,        /* SENT_PORT */
 294     ftpReadEPSV,        /* SENT_EPSV_ALL */
 295     ftpReadEPSV,        /* SENT_EPSV_1 */
 296     ftpReadEPSV,        /* SENT_EPSV_2 */
 297     ftpReadPasv,        /* SENT_PASV */
 298     ftpReadCwd,     /* SENT_CWD */
 299     ftpReadList,        /* SENT_LIST */
 300     ftpReadList,        /* SENT_NLST */
 301     ftpReadRest,        /* SENT_REST */
 302     ftpReadRetr,        /* SENT_RETR */
 303     ftpReadStor,        /* SENT_STOR */
 304     ftpReadQuit,        /* SENT_QUIT */
 305     ftpReadTransferDone,    /* READING_DATA (RETR,LIST,NLST) */
 306     ftpWriteTransferDone,   /* WRITING_DATA (STOR) */
 307     ftpReadMkdir,       /* SENT_MKDIR */
 308     NULL,           /* SENT_FEAT */
 309     NULL,           /* SENT_PWD */
 310     NULL,           /* SENT_CDUP*/
 311     NULL,           /* SENT_DATA_REQUEST */
 312     NULL            /* SENT_COMMAND */
 313 };
 314
 315 /// handler called by Comm when FTP data channel is closed unexpectedly
 316 void
 317 Ftp::Gateway::dataClosed(const CommCloseCbParams &io)
 318 {
 319     Ftp::Client::dataClosed(io);
 320     failed(ERR_FTP_FAILURE, 0);
 321     /* failed closes ctrl.conn and frees ftpState */
 322
 323     /* NP: failure recovery may be possible when its only a data.conn failure.
 324      *     if the ctrl.conn is still fine, we can send ABOR down it and retry.
 325      *     Just need to watch out for wider Squid states like shutting down or reconfigure.
 326      */
 327 }
 328
 329 Ftp::Gateway::Gateway(FwdState *fwdState):
 330     AsyncJob("FtpStateData"),
 331     Ftp::Client(fwdState),
 332     password_url(0),
 333     reply_hdr(NULL),
 334     reply_hdr_state(0),
 335     conn_att(0),
 336     login_att(0),
 337     mdtm(-1),
 338     theSize(-1),
 339     pathcomps(NULL),
 340     filepath(NULL),
 341     dirpath(NULL),
 342     restart_offset(0),
 343     proxy_host(NULL),
 344     list_width(0),
 345     old_filepath(NULL),
 346     typecode('\0')
 347 {
 348     debugs(9, 3, entry->url());
 349
 350     *user = 0;
 351     *password = 0;
 352     memset(&flags, 0, sizeof(flags));
 353
 354     if (Config.Ftp.passive && !flags.pasv_failed)
 355         flags.pasv_supported = 1;
 356
 357     flags.rest_supported = 1;
 358
 359     if (request->method == Http::METHOD_PUT)
 360         flags.put = 1;
 361
 362     initReadBuf();
 363 }
 364
 365 Ftp::Gateway::~Gateway()
 366 {
 367     debugs(9, 3, entry->url());
 368
 369     if (Comm::IsConnOpen(ctrl.conn)) {
 370         debugs(9, DBG_IMPORTANT, "Internal bug: FTP Gateway left open " <<
 371                "control channel " << ctrl.conn);
 372     }
 373
 374     if (reply_hdr) {
 375         memFree(reply_hdr, MEM_8K_BUF);
 376         reply_hdr = NULL;
 377     }
 378
 379     if (pathcomps)
 380         wordlistDestroy(&pathcomps);
 381
 382     cwd_message.clean();
 383     xfree(old_filepath);
 384     title_url.clean();
 385     base_href.clean();
 386     xfree(filepath);
 387     xfree(dirpath);
 388 }
 389
 390 /**
 391  * Parse a possible login username:password pair.
 392  * Produces filled member variables user, password, password_url if anything found.
 393  *
 394  * \param login    a decoded Basic authentication credential token or URI user-info token
 395  * \param escaped  whether to URL-decode the token after extracting user and password
 396  */
 397 void
 398 Ftp::Gateway::loginParser(const SBuf &login, bool escaped)
 399 {
 400     debugs(9, 4, "login=" << login << ", escaped=" << escaped);
 401     debugs(9, 9, "IN : login=" << login << ", escaped=" << escaped << ", user=" << user << ", password=" << password);
 402
 403     if (login.isEmpty())
 404         return;
 405
 406     const SBuf::size_type colonPos = login.find(':');
 407
 408     /* If there was a username part with at least one character use it.
 409      * Ignore 0-length username portion, retain what we have already.
 410      */
 411     if (colonPos == SBuf::npos || colonPos > 0) {
 412         const SBuf userName = login.substr(0, colonPos);
 413         SBuf::size_type upto = userName.copy(user, sizeof(user)-1);
 414         user[upto]='\0';
 415         debugs(9, 9, "found user=" << userName << ' ' <<
 416                (upto != userName.length() ? ", truncated-to=" : ", length=") << upto <<
 417                ", escaped=" << escaped);
 418         if (escaped)
 419             rfc1738_unescape(user);
 420         debugs(9, 9, "found user=" << user << " (" << strlen(user) << ") unescaped.");
 421     }
 422
 423     /* If there was a password part.
 424      * For 0-length password clobber what we have already, this means explicitly none
 425      */
 426     if (colonPos != SBuf::npos) {
 427         const SBuf pass = login.substr(colonPos+1, SBuf::npos);
 428         SBuf::size_type upto = pass.copy(password, sizeof(password)-1);
 429         password[upto]='\0';
 430         debugs(9, 9, "found password=" << pass << " " <<
 431                (upto != pass.length() ? ", truncated-to=" : ", length=") << upto <<
 432                ", escaped=" << escaped);
 433         if (escaped) {
 434             rfc1738_unescape(password);
 435             password_url = 1;
 436         }
 437         debugs(9, 9, "found password=" << password << " (" << strlen(password) << ") unescaped.");
 438     }
 439
 440     debugs(9, 9, "OUT: login=" << login << ", escaped=" << escaped << ", user=" << user << ", password=" << password);
 441 }
 442
 443 void
 444 Ftp::Gateway::listenForDataChannel(const Comm::ConnectionPointer &conn)
 445 {
 446     assert(!Comm::IsConnOpen(data.conn));
 447
 448     typedef CommCbMemFunT<Gateway, CommAcceptCbParams> AcceptDialer;
 449     typedef AsyncCallT<AcceptDialer> AcceptCall;
 450     RefCount<AcceptCall> call = static_cast<AcceptCall*>(JobCallback(11, 5, AcceptDialer, this, Ftp::Gateway::ftpAcceptDataConnection));
 451     Subscription::Pointer sub = new CallSubscription<AcceptCall>(call);
 452     const char *note = entry->url();
 453
 454     /* open the conn if its not already open */
 455     if (!Comm::IsConnOpen(conn)) {
 456         conn->fd = comm_open_listener(SOCK_STREAM, IPPROTO_TCP, conn->local, conn->flags, note);
 457         if (!Comm::IsConnOpen(conn)) {
 458             debugs(5, DBG_CRITICAL, HERE << "comm_open_listener failed:" << conn->local << " error: " << errno);
 459             return;
 460         }
 461         debugs(9, 3, HERE << "Unconnected data socket created on " << conn);
 462     }
 463
 464     conn->tos = ctrl.conn->tos;
 465     conn->nfmark = ctrl.conn->nfmark;
 466
 467     assert(Comm::IsConnOpen(conn));
 468     AsyncJob::Start(new Comm::TcpAcceptor(conn, note, sub));
 469
 470     // Ensure we have a copy of the FD opened for listening and a close handler on it.
 471     data.opened(conn, dataCloser());
 472     switchTimeoutToDataChannel();
 473 }
 474
 475 void
 476 Ftp::Gateway::timeout(const CommTimeoutCbParams &io)
 477 {
 478     if (SENT_PASV == state) {
 479         /* stupid ftp.netscape.com, of FTP server behind stupid firewall rules */
 480         flags.pasv_supported = false;
 481         debugs(9, DBG_IMPORTANT, "FTP Gateway timeout in SENT_PASV state");
 482
 483         // cancel the data connection setup.
 484         if (data.opener != NULL) {
 485             data.opener->cancel("timeout");
 486             data.opener = NULL;
 487         }
 488         data.close();
 489     }
 490
 491     Ftp::Client::timeout(io);
 492 }
 493
 494 static const char *Month[] = {
 495     "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 496     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 497 };
 498
 499 static int
 500 is_month(const char *buf)
 501 {
 502     int i;
 503
 504     for (i = 0; i < 12; ++i)
 505         if (!strcasecmp(buf, Month[i]))
 506             return 1;
 507
 508     return 0;
 509 }
 510
 511 static void
 512 ftpListPartsFree(ftpListParts ** parts)
 513 {
 514     safe_free((*parts)->date);
 515     safe_free((*parts)->name);
 516     safe_free((*parts)->showname);
 517     safe_free((*parts)->link);
 518     safe_free(*parts);
 519 }
 520
 521 #define MAX_TOKENS 64
 522
 523 static ftpListParts *
 524 ftpListParseParts(const char *buf, struct Ftp::GatewayFlags flags)
 525 {
 526     ftpListParts *p = NULL;
 527     char *t = NULL;
 528     const char *ct = NULL;
 529     char *tokens[MAX_TOKENS];
 530     int i;
 531     int n_tokens;
 532     static char tbuf[128];
 533     char *xbuf = NULL;
 534     static int scan_ftp_initialized = 0;
 535     static regex_t scan_ftp_integer;
 536     static regex_t scan_ftp_time;
 537     static regex_t scan_ftp_dostime;
 538     static regex_t scan_ftp_dosdate;
 539
 540     if (!scan_ftp_initialized) {
 541         scan_ftp_initialized = 1;
 542         regcomp(&scan_ftp_integer, "^[0123456789]+$", REG_EXTENDED | REG_NOSUB);
 543         regcomp(&scan_ftp_time, "^[0123456789:]+$", REG_EXTENDED | REG_NOSUB);
 544         regcomp(&scan_ftp_dosdate, "^[0123456789]+-[0123456789]+-[0123456789]+$", REG_EXTENDED | REG_NOSUB);
 545         regcomp(&scan_ftp_dostime, "^[0123456789]+:[0123456789]+[AP]M$", REG_EXTENDED | REG_NOSUB | REG_ICASE);
 546     }
 547
 548     if (buf == NULL)
 549         return NULL;
 550
 551     if (*buf == '\0')
 552         return NULL;
 553
 554     p = (ftpListParts *)xcalloc(1, sizeof(ftpListParts));
 555
 556     n_tokens = 0;
 557
 558     memset(tokens, 0, sizeof(tokens));
 559
 560     xbuf = xstrdup(buf);
 561
 562     if (flags.tried_nlst) {
 563         /* Machine readable format, one name per line */
 564         p->name = xbuf;
 565         p->type = '\0';
 566         return p;
 567     }
 568
 569     for (t = strtok(xbuf, w_space); t && n_tokens < MAX_TOKENS; t = strtok(NULL, w_space)) {
 570         tokens[n_tokens] = xstrdup(t);
 571         ++n_tokens;
 572     }
 573
 574     xfree(xbuf);
 575
 576     /* locate the Month field */
 577     for (i = 3; i < n_tokens - 2; ++i) {
 578         char *size = tokens[i - 1];
 579         char *month = tokens[i];
 580         char *day = tokens[i + 1];
 581         char *year = tokens[i + 2];
 582
 583         if (!is_month(month))
 584             continue;
 585
 586         if (regexec(&scan_ftp_integer, size, 0, NULL, 0) != 0)
 587             continue;
 588
 589         if (regexec(&scan_ftp_integer, day, 0, NULL, 0) != 0)
 590             continue;
 591
 592         if (regexec(&scan_ftp_time, year, 0, NULL, 0) != 0) /* Yr | hh:mm */
 593             continue;
 594
 595         snprintf(tbuf, 128, "%s %2s %5s",
 596                  month, day, year);
 597
 598         if (!strstr(buf, tbuf))
 599             snprintf(tbuf, 128, "%s %2s %-5s",
 600                      month, day, year);
 601
 602         char const *copyFrom = NULL;
 603
 604         if ((copyFrom = strstr(buf, tbuf))) {
 605             p->type = *tokens[0];
 606             p->size = strtoll(size, NULL, 10);
 607             p->date = xstrdup(tbuf);
 608
 609             if (flags.skip_whitespace) {
 610                 copyFrom += strlen(tbuf);
 611
 612                 while (strchr(w_space, *copyFrom))
 613                     ++copyFrom;
 614             } else {
 615                 /* XXX assumes a single space between date and filename
 616                  * suggested by:  Nathan.Bailey@cc.monash.edu.au and
 617                  * Mike Battersby <mike@starbug.bofh.asn.au> */
 618                 copyFrom += strlen(tbuf) + 1;
 619             }
 620
 621             p->name = xstrdup(copyFrom);
 622
 623             if (p->type == 'l' && (t = strstr(p->name, " -> "))) {
 624                 *t = '\0';
 625                 p->link = xstrdup(t + 4);
 626             }
 627
 628             goto found;
 629         }
 630
 631         break;
 632     }
 633
 634     /* try it as a DOS listing, 04-05-70 09:33PM ... */
 635     if (n_tokens > 3 &&
 636             regexec(&scan_ftp_dosdate, tokens[0], 0, NULL, 0) == 0 &&
 637             regexec(&scan_ftp_dostime, tokens[1], 0, NULL, 0) == 0) {
 638         if (!strcasecmp(tokens[2], "<dir>")) {
 639             p->type = 'd';
 640         } else {
 641             p->type = '-';
 642             p->size = strtoll(tokens[2], NULL, 10);
 643         }
 644
 645         snprintf(tbuf, 128, "%s %s", tokens[0], tokens[1]);
 646         p->date = xstrdup(tbuf);
 647
 648         if (p->type == 'd') {
 649             /* Directory.. name begins with first printable after <dir> */
 650             ct = strstr(buf, tokens[2]);
 651             ct += strlen(tokens[2]);
 652
 653             while (xisspace(*ct))
 654                 ++ct;
 655
 656             if (!*ct)
 657                 ct = NULL;
 658         } else {
 659             /* A file. Name begins after size, with a space in between */
 660             snprintf(tbuf, 128, " %s %s", tokens[2], tokens[3]);
 661             ct = strstr(buf, tbuf);
 662
 663             if (ct) {
 664                 ct += strlen(tokens[2]) + 2;
 665             }
 666         }
 667
 668         p->name = xstrdup(ct ? ct : tokens[3]);
 669         goto found;
 670     }
 671
 672     /* Try EPLF format; carson@lehman.com */
 673     if (buf[0] == '+') {
 674         ct = buf + 1;
 675         p->type = 0;
 676
 677         while (ct && *ct) {
 678             time_t tm;
 679             int l = strcspn(ct, ",");
 680             char *tmp;
 681
 682             if (l < 1)
 683                 goto blank;
 684
 685             switch (*ct) {
 686
 687             case '\t':
 688                 p->name = xstrndup(ct + 1, l + 1);
 689                 break;
 690
 691             case 's':
 692                 p->size = atoi(ct + 1);
 693                 break;
 694
 695             case 'm':
 696                 tm = (time_t) strtol(ct + 1, &tmp, 0);
 697
 698                 if (tmp != ct + 1)
 699                     break;  /* not a valid integer */
 700
 701                 p->date = xstrdup(ctime(&tm));
 702
 703                 *(strstr(p->date, "\n")) = '\0';
 704
 705                 break;
 706
 707             case '/':
 708                 p->type = 'd';
 709
 710                 break;
 711
 712             case 'r':
 713                 p->type = '-';
 714
 715                 break;
 716
 717             case 'i':
 718                 break;
 719
 720             default:
 721                 break;
 722             }
 723
 724 blank:
 725             ct = strstr(ct, ",");
 726
 727             if (ct) {
 728                 ++ct;
 729             }
 730         }
 731
 732         if (p->type == 0) {
 733             p->type = '-';
 734         }
 735
 736         if (p->name)
 737             goto found;
 738         else
 739             safe_free(p->date);
 740     }
 741
 742 found:
 743
 744     for (i = 0; i < n_tokens; ++i)
 745         xfree(tokens[i]);
 746
 747     if (!p->name)
 748         ftpListPartsFree(&p);   /* cleanup */
 749
 750     return p;
 751 }
 752
 753 MemBuf *
 754 Ftp::Gateway::htmlifyListEntry(const char *line)
 755 {
 756     char icon[2048];
 757     char href[2048 + 40];
 758     char text[ 2048];
 759     char size[ 2048];
 760     char chdir[ 2048 + 40];
 761     char view[ 2048 + 40];
 762     char download[ 2048 + 40];
 763     char link[ 2048 + 40];
 764     MemBuf *html;
 765     char prefix[2048];
 766     ftpListParts *parts;
 767     *icon = *href = *text = *size = *chdir = *view = *download = *link = '\0';
 768
 769     debugs(9, 7, HERE << " line ={" << line << "}");
 770
 771     if (strlen(line) > 1024) {
 772         html = new MemBuf();
 773         html->init();
 774         html->appendf("<tr><td colspan=\"5\">%s</td></tr>\n", line);
 775         return html;
 776     }
 777
 778     if (flags.dir_slash && dirpath && typecode != 'D')
 779         snprintf(prefix, 2048, "%s/", rfc1738_escape_part(dirpath));
 780     else
 781         prefix[0] = '\0';
 782
 783     if ((parts = ftpListParseParts(line, flags)) == NULL) {
 784         const char *p;
 785
 786         html = new MemBuf();
 787         html->init();
 788         html->appendf("<tr class=\"entry\"><td colspan=\"5\">%s</td></tr>\n", line);
 789
 790         for (p = line; *p && xisspace(*p); ++p);
 791         if (*p && !xisspace(*p))
 792             flags.listformat_unknown = 1;
 793
 794         return html;
 795     }
 796
 797     if (!strcmp(parts->name, ".") || !strcmp(parts->name, "..")) {
 798         ftpListPartsFree(&parts);
 799         return NULL;
 800     }
 801
 802     parts->size += 1023;
 803     parts->size >>= 10;
 804     parts->showname = xstrdup(parts->name);
 805
 806     /* {icon} {text} . . . {date}{size}{chdir}{view}{download}{link}\n  */
 807     xstrncpy(href, rfc1738_escape_part(parts->name), 2048);
 808
 809     xstrncpy(text, parts->showname, 2048);
 810
 811     switch (parts->type) {
 812
 813     case 'd':
 814         snprintf(icon, 2048, "<img border=\"0\" src=\"%s\" alt=\"%-6s\">",
 815                  mimeGetIconURL("internal-dir"),
 816                  "[DIR]");
 817         strcat(href, "/");  /* margin is allocated above */
 818         break;
 819
 820     case 'l':
 821         snprintf(icon, 2048, "<img border=\"0\" src=\"%s\" alt=\"%-6s\">",
 822                  mimeGetIconURL("internal-link"),
 823                  "[LINK]");
 824         /* sometimes there is an 'l' flag, but no "->" link */
 825
 826         if (parts->link) {
 827             char *link2 = xstrdup(html_quote(rfc1738_escape(parts->link)));
 828             snprintf(link, 2048, " -&gt; <a href=\"%s%s\">%s</a>",
 829                      *link2 != '/' ? prefix : "", link2,
 830                      html_quote(parts->link));
 831             safe_free(link2);
 832         }
 833
 834         break;
 835
 836     case '\0':
 837         snprintf(icon, 2048, "<img border=\"0\" src=\"%s\" alt=\"%-6s\">",
 838                  mimeGetIconURL(parts->name),
 839                  "[UNKNOWN]");
 840         snprintf(chdir, 2048, "<a href=\"%s/;type=d\"><img border=\"0\" src=\"%s\" "
 841                  "alt=\"[DIR]\"></a>",
 842                  rfc1738_escape_part(parts->name),
 843                  mimeGetIconURL("internal-dir"));
 844         break;
 845
 846     case '-':
 847
 848     default:
 849         snprintf(icon, 2048, "<img border=\"0\" src=\"%s\" alt=\"%-6s\">",
 850                  mimeGetIconURL(parts->name),
 851                  "[FILE]");
 852         snprintf(size, 2048, " %6" PRId64 "k", parts->size);
 853         break;
 854     }
 855
 856     if (parts->type != 'd') {
 857         if (mimeGetViewOption(parts->name)) {
 858             snprintf(view, 2048, "<a href=\"%s%s;type=a\"><img border=\"0\" src=\"%s\" "
 859                      "alt=\"[VIEW]\"></a>",
 860                      prefix, href, mimeGetIconURL("internal-view"));
 861         }
 862
 863         if (mimeGetDownloadOption(parts->name)) {
 864             snprintf(download, 2048, "<a href=\"%s%s;type=i\"><img border=\"0\" src=\"%s\" "
 865                      "alt=\"[DOWNLOAD]\"></a>",
 866                      prefix, href, mimeGetIconURL("internal-download"));
 867         }
 868     }
 869
 870     /* construct the table row from parts. */
 871     html = new MemBuf();
 872     html->init();
 873     html->appendf("<tr class=\"entry\">"
 874                   "<td class=\"icon\"><a href=\"%s%s\">%s</a></td>"
 875                   "<td class=\"filename\"><a href=\"%s%s\">%s</a></td>"
 876                   "<td class=\"date\">%s</td>"
 877                   "<td class=\"size\">%s</td>"
 878                   "<td class=\"actions\">%s%s%s%s</td>"
 879                   "</tr>\n",
 880                   prefix, href, icon,
 881                   prefix, href, html_quote(text),
 882                   parts->date,
 883                   size,
 884                   chdir, view, download, link);
 885
 886     ftpListPartsFree(&parts);
 887     return html;
 888 }
 889
 890 void
 891 Ftp::Gateway::parseListing()
 892 {
 893     char *buf = data.readBuf->content();
 894     char *sbuf;         /* NULL-terminated copy of termedBuf */
 895     char *end;
 896     char *line;
 897     char *s;
 898     MemBuf *t;
 899     size_t linelen;
 900     size_t usable;
 901     size_t len = data.readBuf->contentSize();
 902
 903     if (!len) {
 904         debugs(9, 3, HERE << "no content to parse for " << entry->url()  );
 905         return;
 906     }
 907
 908     /*
 909      * We need a NULL-terminated buffer for scanning, ick
 910      */
 911     sbuf = (char *)xmalloc(len + 1);
 912     xstrncpy(sbuf, buf, len + 1);
 913     end = sbuf + len - 1;
 914
 915     while (*end != '\r' && *end != '\n' && end > sbuf)
 916         --end;
 917
 918     usable = end - sbuf;
 919
 920     debugs(9, 3, HERE << "usable = " << usable << " of " << len << " bytes.");
 921
 922     if (usable == 0) {
 923         if (buf[0] == '\0' && len == 1) {
 924             debugs(9, 3, HERE << "NIL ends data from " << entry->url() << " transfer problem?");
 925             data.readBuf->consume(len);
 926         } else {
 927             debugs(9, 3, HERE << "didn't find end for " << entry->url());
 928             debugs(9, 3, HERE << "buffer remains (" << len << " bytes) '" << rfc1738_do_escape(buf,0) << "'");
 929         }
 930         xfree(sbuf);
 931         return;
 932     }
 933
 934     debugs(9, 3, HERE << (unsigned long int)len << " bytes to play with");
 935
 936     line = (char *)memAllocate(MEM_4K_BUF);
 937     ++end;
 938     s = sbuf;
 939     s += strspn(s, crlf);
 940
 941     for (; s < end; s += strcspn(s, crlf), s += strspn(s, crlf)) {
 942         debugs(9, 7, HERE << "s = {" << s << "}");
 943         linelen = strcspn(s, crlf) + 1;
 944
 945         if (linelen < 2)
 946             break;
 947
 948         if (linelen > 4096)
 949             linelen = 4096;
 950
 951         xstrncpy(line, s, linelen);
 952
 953         debugs(9, 7, HERE << "{" << line << "}");
 954
 955         if (!strncmp(line, "total", 5))
 956             continue;
 957
 958         t = htmlifyListEntry(line);
 959
 960         if ( t != NULL) {
 961             debugs(9, 7, HERE << "listing append: t = {" << t->contentSize() << ", '" << t->content() << "'}");
 962             listing.append(t->content(), t->contentSize());
 963             delete t;
 964         }
 965     }
 966
 967     debugs(9, 7, HERE << "Done.");
 968     data.readBuf->consume(usable);
 969     memFree(line, MEM_4K_BUF);
 970     xfree(sbuf);
 971 }
 972
 973 void
 974 Ftp::Gateway::processReplyBody()
 975 {
 976     debugs(9, 3, status());
 977
 978     if (request->method == Http::METHOD_HEAD && (flags.isdir || theSize != -1)) {
 979         serverComplete();
 980         return;
 981     }
 982
 983     /* Directory listings are special. They write ther own headers via the error objects */
 984     if (!flags.http_header_sent && data.readBuf->contentSize() >= 0 && !flags.isdir)
 985         appendSuccessHeader();
 986
 987     if (EBIT_TEST(entry->flags, ENTRY_ABORTED)) {
 988         /*
 989          * probably was aborted because content length exceeds one
 990          * of the maximum size limits.
 991          */
 992         abortTransaction("entry aborted after calling appendSuccessHeader()");
 993         return;
 994     }
 995
 996 #if USE_ADAPTATION
 997
 998     if (adaptationAccessCheckPending) {
 999         debugs(9, 3, "returning from Ftp::Gateway::processReplyBody due to adaptationAccessCheckPending");
1000         return;
1001     }
1002
1003 #endif
1004
1005     if (flags.isdir) {
1006         if (!flags.listing) {
1007             flags.listing = 1;
1008             listing.reset();
1009         }
1010         parseListing();
1011         maybeReadVirginBody();
1012         return;
1013     } else if (const int csize = data.readBuf->contentSize()) {
1014         writeReplyBody(data.readBuf->content(), csize);
1015         debugs(9, 5, HERE << "consuming " << csize << " bytes of readBuf");
1016         data.readBuf->consume(csize);
1017     }
1018
1019     entry->flush();
1020
1021     maybeReadVirginBody();
1022 }
1023
1024 /**
1025  * Locates the FTP user:password login.
1026  *
1027  * Highest to lowest priority:
1028  *  - Checks URL (ftp://user:pass@domain)
1029  *  - Authorization: Basic header
1030  *  - squid.conf anonymous-FTP settings (default: anonymous:Squid@).
1031  *
1032  * Special Case: A username-only may be provided in the URL and password in the HTTP headers.
1033  *
1034  * TODO: we might be able to do something about locating username from other sources:
1035  *       ie, external ACL user=* tag or ident lookup
1036  *
1037  \retval 1  if we have everything needed to complete this request.
1038  \retval 0  if something is missing.
1039  */
1040 int
1041 Ftp::Gateway::checkAuth(const HttpHeader * req_hdr)
1042 {
1043     /* default username */
1044     xstrncpy(user, "anonymous", MAX_URL);
1045
1046 #if HAVE_AUTH_MODULE_BASIC
1047     /* Check HTTP Authorization: headers (better than defaults, but less than URL) */
1048     const SBuf auth(req_hdr->getAuth(HDR_AUTHORIZATION, "Basic"));
1049     if (!auth.isEmpty()) {
1050         flags.authenticated = 1;
1051         loginParser(auth, false);
1052     }
1053     /* we fail with authorization-required error later IFF the FTP server requests it */
1054 #endif
1055
1056     /* Test URL login syntax. Overrides any headers received. */
1057     loginParser(request->url.userInfo(), true);
1058
1059     /* name is missing. thats fatal. */
1060     if (!user[0])
1061         fatal("FTP login parsing destroyed username info");
1062
1063     /* name + password == success */
1064     if (password[0])
1065         return 1;
1066
1067     /* Setup default FTP password settings */
1068     /* this has to be done last so that we can have a no-password case above. */
1069     if (!password[0]) {
1070         if (strcmp(user, "anonymous") == 0 && !flags.tried_auth_anonymous) {
1071             xstrncpy(password, Config.Ftp.anon_user, MAX_URL);
1072             flags.tried_auth_anonymous=1;
1073             return 1;
1074         } else if (!flags.tried_auth_nopass) {
1075             xstrncpy(password, null_string, MAX_URL);
1076             flags.tried_auth_nopass=1;
1077             return 1;
1078         }
1079     }
1080
1081     return 0;           /* different username */
1082 }
1083
1084 void
1085 Ftp::Gateway::checkUrlpath()
1086 {
1087     static SBuf str_type_eq("type=");
1088     auto t = request->url.path().rfind(';');
1089
1090     if (t != SBuf::npos) {
1091         auto filenameEnd = t-1;
1092         if (request->url.path().substr(++t).cmp(str_type_eq, str_type_eq.length()) == 0) {
1093             t += str_type_eq.length();
1094             typecode = (char)xtoupper(request->url.path()[t]);
1095             request->url.path(request->url.path().substr(0,filenameEnd));
1096         }
1097     }
1098
1099     int l = request->url.path().length();
1100     /* check for null path */
1101
1102     if (!l) {
1103         flags.isdir = 1;
1104         flags.root_dir = 1;
1105         flags.need_base_href = 1;   /* Work around broken browsers */
1106     } else if (!request->url.path().cmp("/%2f/")) {
1107         /* UNIX root directory */
1108         flags.isdir = 1;
1109         flags.root_dir = 1;
1110     } else if ((l >= 1) && (request->url.path()[l-1] == '/')) {
1111         /* Directory URL, ending in / */
1112         flags.isdir = 1;
1113
1114         if (l == 1)
1115             flags.root_dir = 1;
1116     } else {
1117         flags.dir_slash = 1;
1118     }
1119 }
1120
1121 void
1122 Ftp::Gateway::buildTitleUrl()
1123 {
1124     title_url = "ftp://";
1125
1126     if (strcmp(user, "anonymous")) {
1127         title_url.append(user);
1128         title_url.append("@");
1129     }
1130
1131     SBuf authority = request->url.authority(request->url.getScheme() != AnyP::PROTO_FTP);
1132
1133     title_url.append(authority.rawContent(), authority.length());
1134     title_url.append(request->url.path().rawContent(), request->url.path().length());
1135
1136     base_href = "ftp://";
1137
1138     if (strcmp(user, "anonymous") != 0) {
1139         base_href.append(rfc1738_escape_part(user));
1140
1141         if (password_url) {
1142             base_href.append(":");
1143             base_href.append(rfc1738_escape_part(password));
1144         }
1145
1146         base_href.append("@");
1147     }
1148
1149     base_href.append(authority.rawContent(), authority.length());
1150     base_href.append(request->url.path().rawContent(), request->url.path().length());
1151     base_href.append("/");
1152 }
1153
1154 void
1155 Ftp::Gateway::start()
1156 {
1157     if (!checkAuth(&request->header)) {
1158         /* create appropriate reply */
1159         HttpReply *reply = ftpAuthRequired(request, ftpRealm());
1160         entry->replaceHttpReply(reply);
1161         serverComplete();
1162         return;
1163     }
1164
1165     checkUrlpath();
1166     buildTitleUrl();
1167     debugs(9, 5, "FD " << ctrl.conn->fd << " : host=" << request->url.host() <<
1168            ", path=" << request->url.path() << ", user=" << user << ", passwd=" << password);
1169     state = BEGIN;
1170     Ftp::Client::start();
1171 }
1172
1173 /* ====================================================================== */
1174
1175 void
1176 Ftp::Gateway::handleControlReply()
1177 {
1178     Ftp::Client::handleControlReply();
1179     if (ctrl.message == NULL)
1180         return; // didn't get complete reply yet
1181
1182     /* Copy the message except for the last line to cwd_message to be
1183      * printed in error messages.
1184      */
1185     for (wordlist *w = ctrl.message; w && w->next; w = w->next) {
1186         cwd_message.append('\n');
1187         cwd_message.append(w->key);
1188     }
1189
1190     FTP_SM_FUNCS[state] (this);
1191 }
1192
1193 /* ====================================================================== */
1194
1195 static void
1196 ftpReadWelcome(Ftp::Gateway * ftpState)
1197 {
1198     int code = ftpState->ctrl.replycode;
1199     debugs(9, 3, HERE);
1200
1201     if (ftpState->flags.pasv_only)
1202         ++ ftpState->login_att;
1203
1204     if (code == 220) {
1205         if (ftpState->ctrl.message) {
1206             if (strstr(ftpState->ctrl.message->key, "NetWare"))
1207                 ftpState->flags.skip_whitespace = 1;
1208         }
1209
1210         ftpSendUser(ftpState);
1211     } else if (code == 120) {
1212         if (NULL != ftpState->ctrl.message)
1213             debugs(9, DBG_IMPORTANT, "FTP server is busy: " << ftpState->ctrl.message->key);
1214
1215         return;
1216     } else {
1217         ftpFail(ftpState);
1218     }
1219 }
1220
1221 /**
1222  * Translate FTP login failure into HTTP error
1223  * this is an attmpt to get the 407 message to show up outside Squid.
1224  * its NOT a general failure. But a correct FTP response type.
1225  */
1226 void
1227 Ftp::Gateway::loginFailed()
1228 {
1229     ErrorState *err = NULL;
1230     const char *command, *reply;
1231
1232     if ((state == SENT_USER || state == SENT_PASS) && ctrl.replycode >= 400) {
1233         if (ctrl.replycode == 421 || ctrl.replycode == 426) {
1234             // 421/426 - Service Overload - retry permitted.
1235             err = new ErrorState(ERR_FTP_UNAVAILABLE, Http::scServiceUnavailable, fwd->request);
1236         } else if (ctrl.replycode >= 430 && ctrl.replycode <= 439) {
1237             // 43x - Invalid or Credential Error - retry challenge required.
1238             err = new ErrorState(ERR_FTP_FORBIDDEN, Http::scUnauthorized, fwd->request);
1239         } else if (ctrl.replycode >= 530 && ctrl.replycode <= 539) {
1240             // 53x - Credentials Missing - retry challenge required
1241             if (password_url) // but they were in the URI! major fail.
1242                 err = new ErrorState(ERR_FTP_FORBIDDEN, Http::scForbidden, fwd->request);
1243             else
1244                 err = new ErrorState(ERR_FTP_FORBIDDEN, Http::scUnauthorized, fwd->request);
1245         }
1246     }
1247
1248     // any other problems are general falures.
1249     if (!err) {
1250         ftpFail(this);
1251         return;
1252     }
1253
1254     err->ftp.server_msg = ctrl.message;
1255
1256     ctrl.message = NULL;
1257
1258     if (old_request)
1259         command = old_request;
1260     else
1261         command = ctrl.last_command;
1262
1263     if (command && strncmp(command, "PASS", 4) == 0)
1264         command = "PASS <yourpassword>";
1265
1266     if (old_reply)
1267         reply = old_reply;
1268     else
1269         reply = ctrl.last_reply;
1270
1271     if (command)
1272         err->ftp.request = xstrdup(command);
1273
1274     if (reply)
1275         err->ftp.reply = xstrdup(reply);
1276
1277     HttpReply *newrep = err->BuildHttpReply();
1278     delete err;
1279
1280 #if HAVE_AUTH_MODULE_BASIC
1281     /* add Authenticate header */
1282     newrep->header.putAuth("Basic", ftpRealm());
1283 #endif
1284
1285     // add it to the store entry for response....
1286     entry->replaceHttpReply(newrep);
1287     serverComplete();
1288 }
1289
1290 const char *
1291 Ftp::Gateway::ftpRealm()
1292 {
1293     static char realm[8192];
1294
1295     /* This request is not fully authenticated */
1296     if (!request) {
1297         snprintf(realm, 8192, "FTP %s unknown", user);
1298     } else if (request->url.port() == 21) {
1299         snprintf(realm, 8192, "FTP %s %s", user, request->url.host());
1300     } else {
1301         snprintf(realm, 8192, "FTP %s %s port %d", user, request->url.host(), request->url.port());
1302     }
1303     return realm;
1304 }
1305
1306 static void
1307 ftpSendUser(Ftp::Gateway * ftpState)
1308 {
1309     /* check the server control channel is still available */
1310     if (!ftpState || !ftpState->haveControlChannel("ftpSendUser"))
1311         return;
1312
1313     if (ftpState->proxy_host != NULL)
1314         snprintf(cbuf, CTRL_BUFLEN, "USER %s@%s\r\n", ftpState->user, ftpState->request->url.host());
1315     else
1316         snprintf(cbuf, CTRL_BUFLEN, "USER %s\r\n", ftpState->user);
1317
1318     ftpState->writeCommand(cbuf);
1319
1320     ftpState->state = Ftp::Client::SENT_USER;
1321 }
1322
1323 static void
1324 ftpReadUser(Ftp::Gateway * ftpState)
1325 {
1326     int code = ftpState->ctrl.replycode;
1327     debugs(9, 3, HERE);
1328
1329     if (code == 230) {
1330         ftpReadPass(ftpState);
1331     } else if (code == 331) {
1332         ftpSendPass(ftpState);
1333     } else {
1334         ftpState->loginFailed();
1335     }
1336 }
1337
1338 static void
1339 ftpSendPass(Ftp::Gateway * ftpState)
1340 {
1341     /* check the server control channel is still available */
1342     if (!ftpState || !ftpState->haveControlChannel("ftpSendPass"))
1343         return;
1344
1345     snprintf(cbuf, CTRL_BUFLEN, "PASS %s\r\n", ftpState->password);
1346     ftpState->writeCommand(cbuf);
1347     ftpState->state = Ftp::Client::SENT_PASS;
1348 }
1349
1350 static void
1351 ftpReadPass(Ftp::Gateway * ftpState)
1352 {
1353     int code = ftpState->ctrl.replycode;
1354     debugs(9, 3, HERE << "code=" << code);
1355
1356     if (code == 230) {
1357         ftpSendType(ftpState);
1358     } else {
1359         ftpState->loginFailed();
1360     }
1361 }
1362
1363 static void
1364 ftpSendType(Ftp::Gateway * ftpState)
1365 {
1366     /* check the server control channel is still available */
1367     if (!ftpState || !ftpState->haveControlChannel("ftpSendType"))
1368         return;
1369
1370     /*
1371      * Ref section 3.2.2 of RFC 1738
1372      */
1373     char mode = ftpState->typecode;
1374
1375     switch (mode) {
1376
1377     case 'D':
1378         mode = 'A';
1379         break;
1380
1381     case 'A':
1382
1383     case 'I':
1384         break;
1385
1386     default:
1387
1388         if (ftpState->flags.isdir) {
1389             mode = 'A';
1390         } else {
1391             auto t = ftpState->request->url.path().rfind('/');
1392             // XXX: performance regression, c_str() may reallocate
1393             SBuf filename = ftpState->request->url.path().substr(t != SBuf::npos ? t + 1 : 0);
1394             mode = mimeGetTransferMode(filename.c_str());
1395         }
1396
1397         break;
1398     }
1399
1400     if (mode == 'I')
1401         ftpState->flags.binary = 1;
1402     else
1403         ftpState->flags.binary = 0;
1404
1405     snprintf(cbuf, CTRL_BUFLEN, "TYPE %c\r\n", mode);
1406
1407     ftpState->writeCommand(cbuf);
1408
1409     ftpState->state = Ftp::Client::SENT_TYPE;
1410 }
1411
1412 static void
1413 ftpReadType(Ftp::Gateway * ftpState)
1414 {
1415     int code = ftpState->ctrl.replycode;
1416     char *path;
1417     char *d, *p;
1418     debugs(9, 3, HERE << "code=" << code);
1419
1420     if (code == 200) {
1421         const SBuf tmp = ftpState->request->url.path();
1422         p = path = xstrndup(tmp.rawContent(),tmp.length());
1423
1424         if (*p == '/')
1425             ++p;
1426
1427         while (*p) {
1428             d = p;
1429             p += strcspn(p, "/");
1430
1431             if (*p) {
1432                 *p = '\0';
1433                 ++p;
1434             }
1435
1436             rfc1738_unescape(d);
1437
1438             if (*d)
1439                 wordlistAdd(&ftpState->pathcomps, d);
1440         }
1441
1442         xfree(path);
1443
1444         if (ftpState->pathcomps)
1445             ftpTraverseDirectory(ftpState);
1446         else
1447             ftpListDir(ftpState);
1448     } else {
1449         ftpFail(ftpState);
1450     }
1451 }
1452
1453 static void
1454 ftpTraverseDirectory(Ftp::Gateway * ftpState)
1455 {
1456     wordlist *w;
1457     debugs(9, 4, HERE << (ftpState->filepath ? ftpState->filepath : "<NULL>"));
1458
1459     safe_free(ftpState->dirpath);
1460     ftpState->dirpath = ftpState->filepath;
1461     ftpState->filepath = NULL;
1462
1463     /* Done? */
1464
1465     if (ftpState->pathcomps == NULL) {
1466         debugs(9, 3, HERE << "the final component was a directory");
1467         ftpListDir(ftpState);
1468         return;
1469     }
1470
1471     /* Go to next path component */
1472     w = ftpState->pathcomps;
1473
1474     ftpState->filepath = w->key;
1475
1476     ftpState->pathcomps = w->next;
1477
1478     delete w;
1479
1480     /* Check if we are to CWD or RETR */
1481     if (ftpState->pathcomps != NULL || ftpState->flags.isdir) {
1482         ftpSendCwd(ftpState);
1483     } else {
1484         debugs(9, 3, HERE << "final component is probably a file");
1485         ftpGetFile(ftpState);
1486         return;
1487     }
1488 }
1489
1490 static void
1491 ftpSendCwd(Ftp::Gateway * ftpState)
1492 {
1493     char *path = NULL;
1494
1495     /* check the server control channel is still available */
1496     if (!ftpState || !ftpState->haveControlChannel("ftpSendCwd"))
1497         return;
1498
1499     debugs(9, 3, HERE);
1500
1501     path = ftpState->filepath;
1502
1503     if (!strcmp(path, "..") || !strcmp(path, "/")) {
1504         ftpState->flags.no_dotdot = 1;
1505     } else {
1506         ftpState->flags.no_dotdot = 0;
1507     }
1508
1509     snprintf(cbuf, CTRL_BUFLEN, "CWD %s\r\n", path);
1510
1511     ftpState->writeCommand(cbuf);
1512
1513     ftpState->state = Ftp::Client::SENT_CWD;
1514 }
1515
1516 static void
1517 ftpReadCwd(Ftp::Gateway * ftpState)
1518 {
1519     int code = ftpState->ctrl.replycode;
1520     debugs(9, 3, HERE);
1521
1522     if (code >= 200 && code < 300) {
1523         /* CWD OK */
1524         ftpState->unhack();
1525
1526         /* Reset cwd_message to only include the last message */
1527         ftpState->cwd_message.reset("");
1528         for (wordlist *w = ftpState->ctrl.message; w; w = w->next) {
1529             ftpState->cwd_message.append(' ');
1530             ftpState->cwd_message.append(w->key);
1531         }
1532         ftpState->ctrl.message = NULL;
1533
1534         /* Continue to traverse the path */
1535         ftpTraverseDirectory(ftpState);
1536     } else {
1537         /* CWD FAILED */
1538
1539         if (!ftpState->flags.put)
1540             ftpFail(ftpState);
1541         else
1542             ftpSendMkdir(ftpState);
1543     }
1544 }
1545
1546 static void
1547 ftpSendMkdir(Ftp::Gateway * ftpState)
1548 {
1549     char *path = NULL;
1550
1551     /* check the server control channel is still available */
1552     if (!ftpState || !ftpState->haveControlChannel("ftpSendMkdir"))
1553         return;
1554
1555     path = ftpState->filepath;
1556     debugs(9, 3, HERE << "with path=" << path);
1557     snprintf(cbuf, CTRL_BUFLEN, "MKD %s\r\n", path);
1558     ftpState->writeCommand(cbuf);
1559     ftpState->state = Ftp::Client::SENT_MKDIR;
1560 }
1561
1562 static void
1563 ftpReadMkdir(Ftp::Gateway * ftpState)
1564 {
1565     char *path = ftpState->filepath;
1566     int code = ftpState->ctrl.replycode;
1567
1568     debugs(9, 3, HERE << "path " << path << ", code " << code);
1569
1570     if (code == 257) {      /* success */
1571         ftpSendCwd(ftpState);
1572     } else if (code == 550) {   /* dir exists */
1573
1574         if (ftpState->flags.put_mkdir) {
1575             ftpState->flags.put_mkdir = 1;
1576             ftpSendCwd(ftpState);
1577         } else
1578             ftpSendReply(ftpState);
1579     } else
1580         ftpSendReply(ftpState);
1581 }
1582
1583 static void
1584 ftpGetFile(Ftp::Gateway * ftpState)
1585 {
1586     assert(*ftpState->filepath != '\0');
1587     ftpState->flags.isdir = 0;
1588     ftpSendMdtm(ftpState);
1589 }
1590
1591 static void
1592 ftpListDir(Ftp::Gateway * ftpState)
1593 {
1594     if (ftpState->flags.dir_slash) {
1595         debugs(9, 3, HERE << "Directory path did not end in /");
1596         ftpState->title_url.append("/");
1597         ftpState->flags.isdir = 1;
1598     }
1599
1600     ftpSendPassive(ftpState);
1601 }
1602
1603 static void
1604 ftpSendMdtm(Ftp::Gateway * ftpState)
1605 {
1606     /* check the server control channel is still available */
1607     if (!ftpState || !ftpState->haveControlChannel("ftpSendMdtm"))
1608         return;
1609
1610     assert(*ftpState->filepath != '\0');
1611     snprintf(cbuf, CTRL_BUFLEN, "MDTM %s\r\n", ftpState->filepath);
1612     ftpState->writeCommand(cbuf);
1613     ftpState->state = Ftp::Client::SENT_MDTM;
1614 }
1615
1616 static void
1617 ftpReadMdtm(Ftp::Gateway * ftpState)
1618 {
1619     int code = ftpState->ctrl.replycode;
1620     debugs(9, 3, HERE);
1621
1622     if (code == 213) {
1623         ftpState->mdtm = parse_iso3307_time(ftpState->ctrl.last_reply);
1624         ftpState->unhack();
1625     } else if (code < 0) {
1626         ftpFail(ftpState);
1627         return;
1628     }
1629
1630     ftpSendSize(ftpState);
1631 }
1632
1633 static void
1634 ftpSendSize(Ftp::Gateway * ftpState)
1635 {
1636     /* check the server control channel is still available */
1637     if (!ftpState || !ftpState->haveControlChannel("ftpSendSize"))
1638         return;
1639
1640     /* Only send SIZE for binary transfers. The returned size
1641      * is useless on ASCII transfers */
1642
1643     if (ftpState->flags.binary) {
1644         assert(ftpState->filepath != NULL);
1645         assert(*ftpState->filepath != '\0');
1646         snprintf(cbuf, CTRL_BUFLEN, "SIZE %s\r\n", ftpState->filepath);
1647         ftpState->writeCommand(cbuf);
1648         ftpState->state = Ftp::Client::SENT_SIZE;
1649     } else
1650         /* Skip to next state no non-binary transfers */
1651         ftpSendPassive(ftpState);
1652 }
1653
1654 static void
1655 ftpReadSize(Ftp::Gateway * ftpState)
1656 {
1657     int code = ftpState->ctrl.replycode;
1658     debugs(9, 3, HERE);
1659
1660     if (code == 213) {
1661         ftpState->unhack();
1662         ftpState->theSize = strtoll(ftpState->ctrl.last_reply, NULL, 10);
1663
1664         if (ftpState->theSize == 0) {
1665             debugs(9, 2, "SIZE reported " <<
1666                    ftpState->ctrl.last_reply << " on " <<
1667                    ftpState->title_url);
1668             ftpState->theSize = -1;
1669         }
1670     } else if (code < 0) {
1671         ftpFail(ftpState);
1672         return;
1673     }
1674
1675     ftpSendPassive(ftpState);
1676 }
1677
1678 static void
1679 ftpReadEPSV(Ftp::Gateway* ftpState)
1680 {
1681     Ip::Address srvAddr; // unused
1682     if (ftpState->handleEpsvReply(srvAddr)) {
1683         if (ftpState->ctrl.message == NULL)
1684             return; // didn't get complete reply yet
1685
1686         ftpState->connectDataChannel();
1687     }
1688 }
1689
1690 /** Send Passive connection request.
1691  * Default method is to use modern EPSV request.
1692  * The failover mechanism should check for previous state and re-call with alternates on failure.
1693  */
1694 static void
1695 ftpSendPassive(Ftp::Gateway * ftpState)
1696 {
1697     /** Checks the server control channel is still available before running. */
1698     if (!ftpState || !ftpState->haveControlChannel("ftpSendPassive"))
1699         return;
1700
1701     debugs(9, 3, HERE);
1702
1703     /** \par
1704       * Checks for 'HEAD' method request and passes off for special handling by Ftp::Gateway::processHeadResponse(). */
1705     if (ftpState->request->method == Http::METHOD_HEAD && (ftpState->flags.isdir || ftpState->theSize != -1)) {
1706         ftpState->processHeadResponse(); // may call serverComplete
1707         return;
1708     }
1709
1710     if (ftpState->sendPassive()) {
1711         // SENT_EPSV_ALL blocks other non-EPSV connections being attempted
1712         if (ftpState->state == Ftp::Client::SENT_EPSV_ALL)
1713             ftpState->flags.epsv_all_sent = true;
1714     }
1715 }
1716
1717 void
1718 Ftp::Gateway::processHeadResponse()
1719 {
1720     debugs(9, 5, HERE << "handling HEAD response");
1721     ftpSendQuit(this);
1722     appendSuccessHeader();
1723
1724     /*
1725      * On rare occasions I'm seeing the entry get aborted after
1726      * readControlReply() and before here, probably when
1727      * trying to write to the client.
1728      */
1729     if (EBIT_TEST(entry->flags, ENTRY_ABORTED)) {
1730         abortTransaction("entry aborted while processing HEAD");
1731         return;
1732     }
1733
1734 #if USE_ADAPTATION
1735     if (adaptationAccessCheckPending) {
1736         debugs(9,3, HERE << "returning due to adaptationAccessCheckPending");
1737         return;
1738     }
1739 #endif
1740
1741     // processReplyBody calls serverComplete() since there is no body
1742     processReplyBody();
1743 }
1744
1745 static void
1746 ftpReadPasv(Ftp::Gateway * ftpState)
1747 {
1748     Ip::Address srvAddr; // unused
1749     if (ftpState->handlePasvReply(srvAddr))
1750         ftpState->connectDataChannel();
1751     else {
1752         ftpSendEPRT(ftpState);
1753         return;
1754     }
1755 }
1756
1757 void
1758 Ftp::Gateway::dataChannelConnected(const CommConnectCbParams &io)
1759 {
1760     debugs(9, 3, HERE);
1761     data.opener = NULL;
1762
1763     if (io.flag != Comm::OK) {
1764         debugs(9, 2, HERE << "Failed to connect. Retrying via another method.");
1765
1766         // ABORT on timeouts. server may be waiting on a broken TCP link.
1767         if (io.xerrno == Comm::TIMEOUT)
1768             writeCommand("ABOR");
1769
1770         // try another connection attempt with some other method
1771         ftpSendPassive(this);
1772         return;
1773     }
1774
1775     data.opened(io.conn, dataCloser());
1776     ftpRestOrList(this);
1777 }
1778
1779 static void
1780 ftpOpenListenSocket(Ftp::Gateway * ftpState, int fallback)
1781 {
1782     /// Close old data channels, if any. We may open a new one below.
1783     if (ftpState->data.conn != NULL) {
1784         if ((ftpState->data.conn->flags & COMM_REUSEADDR))
1785             // NP: in fact it points to the control channel. just clear it.
1786             ftpState->data.clear();
1787         else
1788             ftpState->data.close();
1789     }
1790     safe_free(ftpState->data.host);
1791
1792     /*
1793      * Set up a listen socket on the same local address as the
1794      * control connection.
1795      */
1796     Comm::ConnectionPointer temp = new Comm::Connection;
1797     temp->local = ftpState->ctrl.conn->local;
1798
1799     /*
1800      * REUSEADDR is needed in fallback mode, since the same port is
1801      * used for both control and data.
1802      */
1803     if (fallback) {
1804         int on = 1;
1805         setsockopt(ftpState->ctrl.conn->fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on));
1806         ftpState->ctrl.conn->flags |= COMM_REUSEADDR;
1807         temp->flags |= COMM_REUSEADDR;
1808     } else {
1809         /* if not running in fallback mode a new port needs to be retrieved */
1810         temp->local.port(0);
1811     }
1812
1813     ftpState->listenForDataChannel(temp);
1814 }
1815
1816 static void
1817 ftpSendPORT(Ftp::Gateway * ftpState)
1818 {
1819     /* check the server control channel is still available */
1820     if (!ftpState || !ftpState->haveControlChannel("ftpSendPort"))
1821         return;
1822
1823     if (Config.Ftp.epsv_all && ftpState->flags.epsv_all_sent) {
1824         debugs(9, DBG_IMPORTANT, "FTP does not allow PORT method after 'EPSV ALL' has been sent.");
1825         return;
1826     }
1827
1828     debugs(9, 3, HERE);
1829     ftpState->flags.pasv_supported = 0;
1830     ftpOpenListenSocket(ftpState, 0);
1831
1832     if (!Comm::IsConnOpen(ftpState->data.listenConn)) {
1833         if ( ftpState->data.listenConn != NULL && !ftpState->data.listenConn->local.isIPv4() ) {
1834             /* non-IPv4 CANNOT send PORT command.                       */
1835             /* we got here by attempting and failing an EPRT            */
1836             /* using the same reply code should simulate a PORT failure */
1837             ftpReadPORT(ftpState);
1838             return;
1839         }
1840
1841         /* XXX Need to set error message */
1842         ftpFail(ftpState);
1843         return;
1844     }
1845
1846     // pull out the internal IP address bytes to send in PORT command...
1847     // source them from the listen_conn->local
1848
1849     struct addrinfo *AI = NULL;
1850     ftpState->data.listenConn->local.getAddrInfo(AI, AF_INET);
1851     unsigned char *addrptr = (unsigned char *) &((struct sockaddr_in*)AI->ai_addr)->sin_addr;
1852     unsigned char *portptr = (unsigned char *) &((struct sockaddr_in*)AI->ai_addr)->sin_port;
1853     snprintf(cbuf, CTRL_BUFLEN, "PORT %d,%d,%d,%d,%d,%d\r\n",
1854              addrptr[0], addrptr[1], addrptr[2], addrptr[3],
1855              portptr[0], portptr[1]);
1856     ftpState->writeCommand(cbuf);
1857     ftpState->state = Ftp::Client::SENT_PORT;
1858
1859     Ip::Address::FreeAddr(AI);
1860 }
1861
1862 static void
1863 ftpReadPORT(Ftp::Gateway * ftpState)
1864 {
1865     int code = ftpState->ctrl.replycode;
1866     debugs(9, 3, HERE);
1867
1868     if (code != 200) {
1869         /* Fall back on using the same port as the control connection */
1870         debugs(9, 3, "PORT not supported by remote end");
1871         ftpOpenListenSocket(ftpState, 1);
1872     }
1873
1874     ftpRestOrList(ftpState);
1875 }
1876
1877 static void
1878 ftpSendEPRT(Ftp::Gateway * ftpState)
1879 {
1880     if (Config.Ftp.epsv_all && ftpState->flags.epsv_all_sent) {
1881         debugs(9, DBG_IMPORTANT, "FTP does not allow EPRT method after 'EPSV ALL' has been sent.");
1882         return;
1883     }
1884
1885     if (!Config.Ftp.eprt) {
1886         /* Disabled. Switch immediately to attempting old PORT command. */
1887         debugs(9, 3, "EPRT disabled by local administrator");
1888         ftpSendPORT(ftpState);
1889         return;
1890     }
1891
1892     debugs(9, 3, HERE);
1893     ftpState->flags.pasv_supported = 0;
1894
1895     ftpOpenListenSocket(ftpState, 0);
1896     debugs(9, 3, "Listening for FTP data connection with FD " << ftpState->data.conn);
1897     if (!Comm::IsConnOpen(ftpState->data.conn)) {
1898         /* XXX Need to set error message */
1899         ftpFail(ftpState);
1900         return;
1901     }
1902
1903     char buf[MAX_IPSTRLEN];
1904
1905     /* RFC 2428 defines EPRT as IPv6 equivalent to IPv4 PORT command. */
1906     /* Which can be used by EITHER protocol. */
1907     snprintf(cbuf, CTRL_BUFLEN, "EPRT |%d|%s|%d|\r\n",
1908              ( ftpState->data.listenConn->local.isIPv6() ? 2 : 1 ),
1909              ftpState->data.listenConn->local.toStr(buf,MAX_IPSTRLEN),
1910              ftpState->data.listenConn->local.port() );
1911
1912     ftpState->writeCommand(cbuf);
1913     ftpState->state = Ftp::Client::SENT_EPRT;
1914 }
1915
1916 static void
1917 ftpReadEPRT(Ftp::Gateway * ftpState)
1918 {
1919     int code = ftpState->ctrl.replycode;
1920     debugs(9, 3, HERE);
1921
1922     if (code != 200) {
1923         /* Failover to attempting old PORT command. */
1924         debugs(9, 3, "EPRT not supported by remote end");
1925         ftpSendPORT(ftpState);
1926         return;
1927     }
1928
1929     ftpRestOrList(ftpState);
1930 }
1931
1932 /** "read" handler to accept FTP data connections.
1933  *
1934  \param io    comm accept(2) callback parameters
1935  */
1936 void
1937 Ftp::Gateway::ftpAcceptDataConnection(const CommAcceptCbParams &io)
1938 {
1939     debugs(9, 3, HERE);
1940
1941     if (EBIT_TEST(entry->flags, ENTRY_ABORTED)) {
1942         abortTransaction("entry aborted when accepting data conn");
1943         data.listenConn->close();
1944         data.listenConn = NULL;
1945         return;
1946     }
1947
1948     if (io.flag != Comm::OK) {
1949         data.listenConn->close();
1950         data.listenConn = NULL;
1951         debugs(9, DBG_IMPORTANT, "FTP AcceptDataConnection: " << io.conn << ": " << xstrerr(io.xerrno));
1952         /** \todo Need to send error message on control channel*/
1953         ftpFail(this);
1954         return;
1955     }
1956
1957     /* data listening conn is no longer even open. abort. */
1958     if (!Comm::IsConnOpen(data.listenConn)) {
1959         data.listenConn = NULL; // ensure that it's cleared and not just closed.
1960         return;
1961     }
1962
1963     /* data listening conn is no longer even open. abort. */
1964     if (!Comm::IsConnOpen(data.conn)) {
1965         data.clear(); // ensure that it's cleared and not just closed.
1966         return;
1967     }
1968
1969     /** \par
1970      * When squid.conf ftp_sanitycheck is enabled, check the new connection is actually being
1971      * made by the remote client which is connected to the FTP control socket.
1972      * Or the one which we were told to listen for by control channel messages (may differ under NAT).
1973      * This prevents third-party hacks, but also third-party load balancing handshakes.
1974      */
1975     if (Config.Ftp.sanitycheck) {
1976         // accept if either our data or ctrl connection is talking to this remote peer.
1977         if (data.conn->remote != io.conn->remote && ctrl.conn->remote != io.conn->remote) {
1978             debugs(9, DBG_IMPORTANT,
1979                    "FTP data connection from unexpected server (" <<
1980                    io.conn->remote << "), expecting " <<
1981                    data.conn->remote << " or " << ctrl.conn->remote);
1982
1983             /* close the bad sources connection down ASAP. */
1984             io.conn->close();
1985
1986             /* drop the bad connection (io) by ignoring the attempt. */
1987             return;
1988         }
1989     }
1990
1991     /** On Comm::OK start using the accepted data socket and discard the temporary listen socket. */
1992     data.close();
1993     data.opened(io.conn, dataCloser());
1994     data.addr(io.conn->remote);
1995
1996     debugs(9, 3, HERE << "Connected data socket on " <<
1997            io.conn << ". FD table says: " <<
1998            "ctrl-peer= " << fd_table[ctrl.conn->fd].ipaddr << ", " <<
1999            "data-peer= " << fd_table[data.conn->fd].ipaddr);
2000
2001     assert(haveControlChannel("ftpAcceptDataConnection"));
2002     assert(ctrl.message == NULL);
2003
2004     // Ctrl channel operations will determine what happens to this data connection
2005 }
2006
2007 static void
2008 ftpRestOrList(Ftp::Gateway * ftpState)
2009 {
2010     debugs(9, 3, HERE);
2011
2012     if (ftpState->typecode == 'D') {
2013         ftpState->flags.isdir = 1;
2014
2015         if (ftpState->flags.put) {
2016             ftpSendMkdir(ftpState); /* PUT name;type=d */
2017         } else {
2018             ftpSendNlst(ftpState);  /* GET name;type=d  sec 3.2.2 of RFC 1738 */
2019         }
2020     } else if (ftpState->flags.put) {
2021         ftpSendStor(ftpState);
2022     } else if (ftpState->flags.isdir)
2023         ftpSendList(ftpState);
2024     else if (ftpState->restartable())
2025         ftpSendRest(ftpState);
2026     else
2027         ftpSendRetr(ftpState);
2028 }
2029
2030 static void
2031 ftpSendStor(Ftp::Gateway * ftpState)
2032 {
2033     /* check the server control channel is still available */
2034     if (!ftpState || !ftpState->haveControlChannel("ftpSendStor"))
2035         return;
2036
2037     debugs(9, 3, HERE);
2038
2039     if (ftpState->filepath != NULL) {
2040         /* Plain file upload */
2041         snprintf(cbuf, CTRL_BUFLEN, "STOR %s\r\n", ftpState->filepath);
2042         ftpState->writeCommand(cbuf);
2043         ftpState->state = Ftp::Client::SENT_STOR;
2044     } else if (ftpState->request->header.getInt64(HDR_CONTENT_LENGTH) > 0) {
2045         /* File upload without a filename. use STOU to generate one */
2046         snprintf(cbuf, CTRL_BUFLEN, "STOU\r\n");
2047         ftpState->writeCommand(cbuf);
2048         ftpState->state = Ftp::Client::SENT_STOR;
2049     } else {
2050         /* No file to transfer. Only create directories if needed */
2051         ftpSendReply(ftpState);
2052     }
2053 }
2054
2055 /// \deprecated use ftpState->readStor() instead.
2056 static void
2057 ftpReadStor(Ftp::Gateway * ftpState)
2058 {
2059     ftpState->readStor();
2060 }
2061
2062 void Ftp::Gateway::readStor()
2063 {
2064     int code = ctrl.replycode;
2065     debugs(9, 3, HERE);
2066
2067     if (code == 125 || (code == 150 && Comm::IsConnOpen(data.conn))) {
2068         if (!originalRequest()->body_pipe) {
2069             debugs(9, 3, "zero-size STOR?");
2070             state = WRITING_DATA; // make ftpWriteTransferDone() responsible
2071             dataComplete(); // XXX: keep in sync with doneSendingRequestBody()
2072             return;
2073         }
2074
2075         if (!startRequestBodyFlow()) { // register to receive body data
2076             ftpFail(this);
2077             return;
2078         }
2079
2080         /* When client status is 125, or 150 and the data connection is open, Begin data transfer. */
2081         debugs(9, 3, HERE << "starting data transfer");
2082         switchTimeoutToDataChannel();
2083         sendMoreRequestBody();
2084         fwd->dontRetry(true); // dont permit re-trying if the body was sent.
2085         state = WRITING_DATA;
2086         debugs(9, 3, HERE << "writing data channel");
2087     } else if (code == 150) {
2088         /* When client code is 150 with no data channel, Accept data channel. */
2089         debugs(9, 3, "ftpReadStor: accepting data channel");
2090         listenForDataChannel(data.conn);
2091     } else {
2092         debugs(9, DBG_IMPORTANT, HERE << "Unexpected reply code "<< std::setfill('0') << std::setw(3) << code);
2093         ftpFail(this);
2094     }
2095 }
2096
2097 static void
2098 ftpSendRest(Ftp::Gateway * ftpState)
2099 {
2100     /* check the server control channel is still available */
2101     if (!ftpState || !ftpState->haveControlChannel("ftpSendRest"))
2102         return;
2103
2104     debugs(9, 3, HERE);
2105
2106     snprintf(cbuf, CTRL_BUFLEN, "REST %" PRId64 "\r\n", ftpState->restart_offset);
2107     ftpState->writeCommand(cbuf);
2108     ftpState->state = Ftp::Client::SENT_REST;
2109 }
2110
2111 int
2112 Ftp::Gateway::restartable()
2113 {
2114     if (restart_offset > 0)
2115         return 1;
2116
2117     if (!request->range)
2118         return 0;
2119
2120     if (!flags.binary)
2121         return 0;
2122
2123     if (theSize <= 0)
2124         return 0;
2125
2126     int64_t desired_offset = request->range->lowestOffset(theSize);
2127
2128     if (desired_offset <= 0)
2129         return 0;
2130
2131     if (desired_offset >= theSize)
2132         return 0;
2133
2134     restart_offset = desired_offset;
2135     return 1;
2136 }
2137
2138 static void
2139 ftpReadRest(Ftp::Gateway * ftpState)
2140 {
2141     int code = ftpState->ctrl.replycode;
2142     debugs(9, 3, HERE);
2143     assert(ftpState->restart_offset > 0);
2144
2145     if (code == 350) {
2146         ftpState->setCurrentOffset(ftpState->restart_offset);
2147         ftpSendRetr(ftpState);
2148     } else if (code > 0) {
2149         debugs(9, 3, HERE << "REST not supported");
2150         ftpState->flags.rest_supported = 0;
2151         ftpSendRetr(ftpState);
2152     } else {
2153         ftpFail(ftpState);
2154     }
2155 }
2156
2157 static void
2158 ftpSendList(Ftp::Gateway * ftpState)
2159 {
2160     /* check the server control channel is still available */
2161     if (!ftpState || !ftpState->haveControlChannel("ftpSendList"))
2162         return;
2163
2164     debugs(9, 3, HERE);
2165
2166     if (ftpState->filepath) {
2167         snprintf(cbuf, CTRL_BUFLEN, "LIST %s\r\n", ftpState->filepath);
2168     } else {
2169         snprintf(cbuf, CTRL_BUFLEN, "LIST\r\n");
2170     }
2171
2172     ftpState->writeCommand(cbuf);
2173     ftpState->state = Ftp::Client::SENT_LIST;
2174 }
2175
2176 static void
2177 ftpSendNlst(Ftp::Gateway * ftpState)
2178 {
2179     /* check the server control channel is still available */
2180     if (!ftpState || !ftpState->haveControlChannel("ftpSendNlst"))
2181         return;
2182
2183     debugs(9, 3, HERE);
2184
2185     ftpState->flags.tried_nlst = 1;
2186
2187     if (ftpState->filepath) {
2188         snprintf(cbuf, CTRL_BUFLEN, "NLST %s\r\n", ftpState->filepath);
2189     } else {
2190         snprintf(cbuf, CTRL_BUFLEN, "NLST\r\n");
2191     }
2192
2193     ftpState->writeCommand(cbuf);
2194     ftpState->state = Ftp::Client::SENT_NLST;
2195 }
2196
2197 static void
2198 ftpReadList(Ftp::Gateway * ftpState)
2199 {
2200     int code = ftpState->ctrl.replycode;
2201     debugs(9, 3, HERE);
2202
2203     if (code == 125 || (code == 150 && Comm::IsConnOpen(ftpState->data.conn))) {
2204         /* Begin data transfer */
2205         debugs(9, 3, HERE << "begin data transfer from " << ftpState->data.conn->remote << " (" << ftpState->data.conn->local << ")");
2206         ftpState->switchTimeoutToDataChannel();
2207         ftpState->maybeReadVirginBody();
2208         ftpState->state = Ftp::Client::READING_DATA;
2209         return;
2210     } else if (code == 150) {
2211         /* Accept data channel */
2212         debugs(9, 3, HERE << "accept data channel from " << ftpState->data.conn->remote << " (" << ftpState->data.conn->local << ")");
2213         ftpState->listenForDataChannel(ftpState->data.conn);
2214         return;
2215     } else if (!ftpState->flags.tried_nlst && code > 300) {
2216         ftpSendNlst(ftpState);
2217     } else {
2218         ftpFail(ftpState);
2219         return;
2220     }
2221 }
2222
2223 static void
2224 ftpSendRetr(Ftp::Gateway * ftpState)
2225 {
2226     /* check the server control channel is still available */
2227     if (!ftpState || !ftpState->haveControlChannel("ftpSendRetr"))
2228         return;
2229
2230     debugs(9, 3, HERE);
2231
2232     assert(ftpState->filepath != NULL);
2233     snprintf(cbuf, CTRL_BUFLEN, "RETR %s\r\n", ftpState->filepath);
2234     ftpState->writeCommand(cbuf);
2235     ftpState->state = Ftp::Client::SENT_RETR;
2236 }
2237
2238 static void
2239 ftpReadRetr(Ftp::Gateway * ftpState)
2240 {
2241     int code = ftpState->ctrl.replycode;
2242     debugs(9, 3, HERE);
2243
2244     if (code == 125 || (code == 150 && Comm::IsConnOpen(ftpState->data.conn))) {
2245         /* Begin data transfer */
2246         debugs(9, 3, HERE << "begin data transfer from " << ftpState->data.conn->remote << " (" << ftpState->data.conn->local << ")");
2247         ftpState->switchTimeoutToDataChannel();
2248         ftpState->maybeReadVirginBody();
2249         ftpState->state = Ftp::Client::READING_DATA;
2250     } else if (code == 150) {
2251         /* Accept data channel */
2252         ftpState->listenForDataChannel(ftpState->data.conn);
2253     } else if (code >= 300) {
2254         if (!ftpState->flags.try_slash_hack) {
2255             /* Try this as a directory missing trailing slash... */
2256             ftpState->hackShortcut(ftpSendCwd);
2257         } else {
2258             ftpFail(ftpState);
2259         }
2260     } else {
2261         ftpFail(ftpState);
2262     }
2263 }
2264
2265 /**
2266  * Generate the HTTP headers and template fluff around an FTP
2267  * directory listing display.
2268  */
2269 void
2270 Ftp::Gateway::completedListing()
2271 {
2272     assert(entry);
2273     entry->lock("Ftp::Gateway");
2274     ErrorState ferr(ERR_DIR_LISTING, Http::scOkay, request);
2275     ferr.ftp.listing = &listing;
2276     ferr.ftp.cwd_msg = xstrdup(cwd_message.size()? cwd_message.termedBuf() : "");
2277     ferr.ftp.server_msg = ctrl.message;
2278     ctrl.message = NULL;
2279     entry->replaceHttpReply( ferr.BuildHttpReply() );
2280     EBIT_CLR(entry->flags, ENTRY_FWD_HDR_WAIT);
2281     entry->flush();
2282     entry->unlock("Ftp::Gateway");
2283 }
2284
2285 static void
2286 ftpReadTransferDone(Ftp::Gateway * ftpState)
2287 {
2288     int code = ftpState->ctrl.replycode;
2289     debugs(9, 3, HERE);
2290
2291     if (code == 226 || code == 250) {
2292         /* Connection closed; retrieval done. */
2293         if (ftpState->flags.listing) {
2294             ftpState->completedListing();
2295             /* QUIT operation handles sending the reply to client */
2296         }
2297         ftpSendQuit(ftpState);
2298     } else {            /* != 226 */
2299         debugs(9, DBG_IMPORTANT, HERE << "Got code " << code << " after reading data");
2300         ftpState->failed(ERR_FTP_FAILURE, 0);
2301         /* failed closes ctrl.conn and frees ftpState */
2302         return;
2303     }
2304 }
2305
2306 // premature end of the request body
2307 void
2308 Ftp::Gateway::handleRequestBodyProducerAborted()
2309 {
2310     Client::handleRequestBodyProducerAborted();
2311     debugs(9, 3, HERE << "ftpState=" << this);
2312     failed(ERR_READ_ERROR, 0);
2313 }
2314
2315 static void
2316 ftpWriteTransferDone(Ftp::Gateway * ftpState)
2317 {
2318     int code = ftpState->ctrl.replycode;
2319     debugs(9, 3, HERE);
2320
2321     if (!(code == 226 || code == 250)) {
2322         debugs(9, DBG_IMPORTANT, HERE << "Got code " << code << " after sending data");
2323         ftpState->failed(ERR_FTP_PUT_ERROR, 0);
2324         return;
2325     }
2326
2327     ftpState->entry->timestampsSet();   /* XXX Is this needed? */
2328     ftpSendReply(ftpState);
2329 }
2330
2331 static void
2332 ftpSendQuit(Ftp::Gateway * ftpState)
2333 {
2334     /* check the server control channel is still available */
2335     if (!ftpState || !ftpState->haveControlChannel("ftpSendQuit"))
2336         return;
2337
2338     snprintf(cbuf, CTRL_BUFLEN, "QUIT\r\n");
2339     ftpState->writeCommand(cbuf);
2340     ftpState->state = Ftp::Client::SENT_QUIT;
2341 }
2342
2343 /** Completes a client FTP operation with success or other page
2344  *  generated and stored in the entry field by the code issuing QUIT.
2345  */
2346 static void
2347 ftpReadQuit(Ftp::Gateway * ftpState)
2348 {
2349     ftpState->serverComplete();
2350 }
2351
2352 static void
2353 ftpTrySlashHack(Ftp::Gateway * ftpState)
2354 {
2355     char *path;
2356     ftpState->flags.try_slash_hack = 1;
2357     /* Free old paths */
2358
2359     debugs(9, 3, HERE);
2360
2361     if (ftpState->pathcomps)
2362         wordlistDestroy(&ftpState->pathcomps);
2363
2364     safe_free(ftpState->filepath);
2365
2366     /* Build the new path (urlpath begins with /) */
2367     const SBuf tmp = ftpState->request->url.path();
2368     path = xstrndup(tmp.rawContent(), tmp.length());
2369     path[tmp.length()] = '\0';
2370
2371     rfc1738_unescape(path);
2372
2373     ftpState->filepath = path;
2374
2375     /* And off we go */
2376     ftpGetFile(ftpState);
2377 }
2378
2379 /**
2380  * Forget hack status. Next error is shown to the user
2381  */
2382 void
2383 Ftp::Gateway::unhack()
2384 {
2385     debugs(9, 3, HERE);
2386
2387     if (old_request != NULL) {
2388         safe_free(old_request);
2389         safe_free(old_reply);
2390     }
2391 }
2392
2393 void
2394 Ftp::Gateway::hackShortcut(FTPSM * nextState)
2395 {
2396     /* Clear some unwanted state */
2397     setCurrentOffset(0);
2398     restart_offset = 0;
2399     /* Save old error message & some state info */
2400
2401     debugs(9, 3, HERE);
2402
2403     if (old_request == NULL) {
2404         old_request = ctrl.last_command;
2405         ctrl.last_command = NULL;
2406         old_reply = ctrl.last_reply;
2407         ctrl.last_reply = NULL;
2408
2409         if (pathcomps == NULL && filepath != NULL)
2410             old_filepath = xstrdup(filepath);
2411     }
2412
2413     /* Jump to the "hack" state */
2414     nextState(this);
2415 }
2416
2417 static void
2418 ftpFail(Ftp::Gateway *ftpState)
2419 {
2420     const bool slashHack = ftpState->request->url.path().caseCmp("/%2f", 4)==0;
2421     debugs(9, 6, "flags(" <<
2422            (ftpState->flags.isdir?"IS_DIR,":"") <<
2423            (ftpState->flags.try_slash_hack?"TRY_SLASH_HACK":"") << "), " <<
2424            "mdtm=" << ftpState->mdtm << ", size=" << ftpState->theSize <<
2425            "slashhack=" << (slashHack? "T":"F"));
2426
2427     /* Try the / hack to support "Netscape" FTP URL's for retreiving files */
2428     if (!ftpState->flags.isdir &&   /* Not a directory */
2429             !ftpState->flags.try_slash_hack && !slashHack && /* Not doing slash hack */
2430             ftpState->mdtm <= 0 && ftpState->theSize < 0) { /* Not known as a file */
2431
2432         switch (ftpState->state) {
2433
2434         case Ftp::Client::SENT_CWD:
2435
2436         case Ftp::Client::SENT_RETR:
2437             /* Try the / hack */
2438             ftpState->hackShortcut(ftpTrySlashHack);
2439             return;
2440
2441         default:
2442             break;
2443         }
2444     }
2445
2446     ftpState->failed(ERR_NONE, 0);
2447     /* failed() closes ctrl.conn and frees this */
2448 }
2449
2450 Http::StatusCode
2451 Ftp::Gateway::failedHttpStatus(err_type &error)
2452 {
2453     if (error == ERR_NONE) {
2454         switch (state) {
2455
2456         case SENT_USER:
2457
2458         case SENT_PASS:
2459
2460             if (ctrl.replycode > 500) {
2461                 error = ERR_FTP_FORBIDDEN;
2462                 return password_url ? Http::scForbidden : Http::scUnauthorized;
2463             } else if (ctrl.replycode == 421) {
2464                 error = ERR_FTP_UNAVAILABLE;
2465                 return Http::scServiceUnavailable;
2466             }
2467             break;
2468
2469         case SENT_CWD:
2470
2471         case SENT_RETR:
2472             if (ctrl.replycode == 550) {
2473                 error = ERR_FTP_NOT_FOUND;
2474                 return Http::scNotFound;
2475             }
2476             break;
2477
2478         default:
2479             break;
2480         }
2481     }
2482     return Ftp::Client::failedHttpStatus(error);
2483 }
2484
2485 static void
2486 ftpSendReply(Ftp::Gateway * ftpState)
2487 {
2488     int code = ftpState->ctrl.replycode;
2489     Http::StatusCode http_code;
2490     err_type err_code = ERR_NONE;
2491
2492     debugs(9, 3, HERE << ftpState->entry->url() << ", code " << code);
2493
2494     if (cbdataReferenceValid(ftpState))
2495         debugs(9, 5, HERE << "ftpState (" << ftpState << ") is valid!");
2496
2497     if (code == 226 || code == 250) {
2498         err_code = (ftpState->mdtm > 0) ? ERR_FTP_PUT_MODIFIED : ERR_FTP_PUT_CREATED;
2499         http_code = (ftpState->mdtm > 0) ? Http::scAccepted : Http::scCreated;
2500     } else if (code == 227) {
2501         err_code = ERR_FTP_PUT_CREATED;
2502         http_code = Http::scCreated;
2503     } else {
2504         err_code = ERR_FTP_PUT_ERROR;
2505         http_code = Http::scInternalServerError;
2506     }
2507
2508     ErrorState err(err_code, http_code, ftpState->request);
2509
2510     if (ftpState->old_request)
2511         err.ftp.request = xstrdup(ftpState->old_request);
2512     else
2513         err.ftp.request = xstrdup(ftpState->ctrl.last_command);
2514
2515     if (ftpState->old_reply)
2516         err.ftp.reply = xstrdup(ftpState->old_reply);
2517     else if (ftpState->ctrl.last_reply)
2518         err.ftp.reply = xstrdup(ftpState->ctrl.last_reply);
2519     else
2520         err.ftp.reply = xstrdup("");
2521
2522     // TODO: interpret as FTP-specific error code
2523     err.detailError(code);
2524
2525     ftpState->entry->replaceHttpReply( err.BuildHttpReply() );
2526
2527     ftpSendQuit(ftpState);
2528 }
2529
2530 void
2531 Ftp::Gateway::appendSuccessHeader()
2532 {
2533     debugs(9, 3, HERE);
2534
2535     if (flags.http_header_sent)
2536         return;
2537
2538     HttpReply *reply = new HttpReply;
2539
2540     flags.http_header_sent = 1;
2541
2542     assert(entry->isEmpty());
2543
2544     EBIT_CLR(entry->flags, ENTRY_FWD_HDR_WAIT);
2545
2546     entry->buffer();    /* released when done processing current data payload */
2547
2548     SBuf urlPath = request->url.path();
2549     auto t = urlPath.rfind('/');
2550     SBuf filename = urlPath.substr(t != SBuf::npos ? t : 0);
2551
2552     const char *mime_type = NULL;
2553     const char *mime_enc = NULL;
2554
2555     if (flags.isdir) {
2556         mime_type = "text/html";
2557     } else {
2558         switch (typecode) {
2559
2560         case 'I':
2561             mime_type = "application/octet-stream";
2562             // XXX: performance regression, c_str() may reallocate
2563             mime_enc = mimeGetContentEncoding(filename.c_str());
2564             break;
2565
2566         case 'A':
2567             mime_type = "text/plain";
2568             break;
2569
2570         default:
2571             // XXX: performance regression, c_str() may reallocate
2572             mime_type = mimeGetContentType(filename.c_str());
2573             mime_enc = mimeGetContentEncoding(filename.c_str());
2574             break;
2575         }
2576     }
2577
2578     /* set standard stuff */
2579
2580     if (0 == getCurrentOffset()) {
2581         /* Full reply */
2582         reply->setHeaders(Http::scOkay, "Gatewaying", mime_type, theSize, mdtm, -2);
2583     } else if (theSize < getCurrentOffset()) {
2584         /*
2585          * DPW 2007-05-04
2586          * offset should not be larger than theSize.  We should
2587          * not be seeing this condition any more because we'll only
2588          * send REST if we know the theSize and if it is less than theSize.
2589          */
2590         debugs(0,DBG_CRITICAL,HERE << "Whoops! " <<
2591                " current offset=" << getCurrentOffset() <<
2592                ", but theSize=" << theSize <<
2593                ".  assuming full content response");
2594         reply->setHeaders(Http::scOkay, "Gatewaying", mime_type, theSize, mdtm, -2);
2595     } else {
2596         /* Partial reply */
2597         HttpHdrRangeSpec range_spec;
2598         range_spec.offset = getCurrentOffset();
2599         range_spec.length = theSize - getCurrentOffset();
2600         reply->setHeaders(Http::scPartialContent, "Gatewaying", mime_type, theSize - getCurrentOffset(), mdtm, -2);
2601         httpHeaderAddContRange(&reply->header, range_spec, theSize);
2602     }
2603
2604     /* additional info */
2605     if (mime_enc)
2606         reply->header.putStr(HDR_CONTENT_ENCODING, mime_enc);
2607
2608     setVirginReply(reply);
2609     adaptOrFinalizeReply();
2610 }
2611
2612 void
2613 Ftp::Gateway::haveParsedReplyHeaders()
2614 {
2615     Client::haveParsedReplyHeaders();
2616
2617     StoreEntry *e = entry;
2618
2619     e->timestampsSet();
2620
2621     if (flags.authenticated) {
2622         /*
2623          * Authenticated requests can't be cached.
2624          */
2625         e->release();
2626     } else if (!EBIT_TEST(e->flags, RELEASE_REQUEST) && !getCurrentOffset()) {
2627         e->setPublicKey();
2628     } else {
2629         e->release();
2630     }
2631 }
2632
2633 HttpReply *
2634 Ftp::Gateway::ftpAuthRequired(HttpRequest * request, const char *realm)
2635 {
2636     ErrorState err(ERR_CACHE_ACCESS_DENIED, Http::scUnauthorized, request);
2637     HttpReply *newrep = err.BuildHttpReply();
2638 #if HAVE_AUTH_MODULE_BASIC
2639     /* add Authenticate header */
2640     newrep->header.putAuth("Basic", realm);
2641 #endif
2642     return newrep;
2643 }
2644
2645 const char *
2646 Ftp::UrlWith2f(HttpRequest * request)
2647 {
2648     SBuf newbuf("%2f");
2649
2650     if (request->url.getScheme() != AnyP::PROTO_FTP)
2651         return NULL;
2652
2653     if (request->url.path()[0] == '/') {
2654         newbuf.append(request->url.path());
2655         request->url.path(newbuf);
2656         safe_free(request->canonical);
2657     } else if (!request->url.path().startsWith(newbuf)) {
2658         newbuf.append(request->url.path().substr(1));
2659         request->url.path(newbuf);
2660         safe_free(request->canonical);
2661     }
2662
2663     return urlCanonical(request);
2664 }
2665
2666 void
2667 Ftp::Gateway::printfReplyBody(const char *fmt, ...)
2668 {
2669     va_list args;
2670     va_start (args, fmt);
2671     static char buf[4096];
2672     buf[0] = '\0';
2673     vsnprintf(buf, 4096, fmt, args);
2674     writeReplyBody(buf, strlen(buf));
2675     va_end(args);
2676 }
2677
2678 /**
2679  * Call this when there is data from the origin server
2680  * which should be sent to either StoreEntry, or to ICAP...
2681  */
2682 void
2683 Ftp::Gateway::writeReplyBody(const char *dataToWrite, size_t dataLength)
2684 {
2685     debugs(9, 5, HERE << "writing " << dataLength << " bytes to the reply");
2686     addVirginReplyBody(dataToWrite, dataLength);
2687 }
2688
2689 /**
2690  * A hack to ensure we do not double-complete on the forward entry.
2691  *
2692  \todo Ftp::Gateway logic should probably be rewritten to avoid
2693  *  double-completion or FwdState should be rewritten to allow it.
2694  */
2695 void
2696 Ftp::Gateway::completeForwarding()
2697 {
2698     if (fwd == NULL || flags.completed_forwarding) {
2699         debugs(9, 3, HERE << "completeForwarding avoids " <<
2700                "double-complete on FD " << ctrl.conn->fd << ", Data FD " << data.conn->fd <<
2701                ", this " << this << ", fwd " << fwd);
2702         return;
2703     }
2704
2705     flags.completed_forwarding = true;
2706     Client::completeForwarding();
2707 }
2708
2709 /**
2710  * Have we lost the FTP server control channel?
2711  *
2712  \retval true   The server control channel is available.
2713  \retval false  The server control channel is not available.
2714  */
2715 bool
2716 Ftp::Gateway::haveControlChannel(const char *caller_name) const
2717 {
2718     if (doneWithServer())
2719         return false;
2720
2721     /* doneWithServer() only checks BOTH channels are closed. */
2722     if (!Comm::IsConnOpen(ctrl.conn)) {
2723         debugs(9, DBG_IMPORTANT, "WARNING! FTP Server Control channel is closed, but Data channel still active.");
2724         debugs(9, 2, caller_name << ": attempted on a closed FTP channel.");
2725         return false;
2726     }
2727
2728     return true;
2729 }
2730
2731 bool
2732 Ftp::Gateway::mayReadVirginReplyBody() const
2733 {
2734     // TODO: Can we do what Ftp::Relay::mayReadVirginReplyBody() does instead?
2735     return !doneWithServer();
2736 }
2737
2738 AsyncJob::Pointer
2739 Ftp::StartGateway(FwdState *const fwdState)
2740 {
2741     return AsyncJob::Start(new Ftp::Gateway(fwdState));
2742 }
2743