daemon/transfer.c

   1 /*
   2  *  Dolda Connect - Modular multiuser Direct Connect-style client
   3  *  Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 */
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <signal.h>
  25 #include <pwd.h>
  26 #include <grp.h>
  27 #include <errno.h>
  28 #include <sys/wait.h>
  29 #include <stdint.h>
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include <config.h>
  33 #endif
  34 #include "log.h"
  35 #include "utils.h"
  36 #include "sysevents.h"
  37 #include "auth.h"
  38 #include "transfer.h"
  39 #include "module.h"
  40 #include "client.h"
  41
  42 static void killfilter(struct transfer *transfer);
  43
  44 unsigned long long bytesupload = 0;
  45 unsigned long long bytesdownload = 0;
  46 struct transfer *transfers = NULL;
  47 int numtransfers = 0;
  48 GCBCHAIN(newtransfercb, struct transfer *);
  49
  50 void freetransfer(struct transfer *transfer)
  51 {
  52     if(transfer == transfers)
  53         transfers = transfer->next;
  54     if(transfer->next != NULL)
  55         transfer->next->prev = transfer->prev;
  56     if(transfer->prev != NULL)
  57         transfer->prev->next = transfer->next;
  58     CBCHAINDOCB(transfer, trans_destroy, transfer);
  59     CBCHAINFREE(transfer, trans_ac);
  60     CBCHAINFREE(transfer, trans_act);
  61     CBCHAINFREE(transfer, trans_p);
  62     CBCHAINFREE(transfer, trans_destroy);
  63     CBCHAINFREE(transfer, trans_filterout);
  64     while(transfer->args != NULL)
  65         freewcspair(transfer->args, &transfer->args);
  66     if(transfer->filter != -1)
  67         killfilter(transfer);
  68     if(transfer->etimer != NULL)
  69         canceltimer(transfer->etimer);
  70     if(transfer->auth != NULL)
  71         authputhandle(transfer->auth);
  72     if(transfer->peerid != NULL)
  73         free(transfer->peerid);
  74     if(transfer->peernick != NULL)
  75         free(transfer->peernick);
  76     if(transfer->path != NULL)
  77         free(transfer->path);
  78     if(transfer->actdesc != NULL)
  79         free(transfer->actdesc);
  80     if(transfer->filterbuf != NULL)
  81         free(transfer->filterbuf);
  82     if(transfer->hash != NULL)
  83         freehash(transfer->hash);
  84     if(transfer->exitstatus != NULL)
  85         free(transfer->exitstatus);
  86     if(transfer->localend != NULL)
  87     {
  88         transfer->localend->readcb = NULL;
  89         transfer->localend->writecb = NULL;
  90         transfer->localend->errcb = NULL;
  91         putsock(transfer->localend);
  92     }
  93     if(transfer->filterout != NULL)
  94     {
  95         transfer->filterout->readcb = NULL;
  96         transfer->filterout->writecb = NULL;
  97         transfer->filterout->errcb = NULL;
  98         putsock(transfer->filterout);
  99     }
 100     if(transfer->fn != NULL)
 101         putfnetnode(transfer->fn);
 102     free(transfer);
 103     numtransfers--;
 104 }
 105
 106 struct transfer *newtransfer(void)
 107 {
 108     struct transfer *new;
 109     static int curid = 0;
 110
 111     new = smalloc(sizeof(*new));
 112     memset(new, 0, sizeof(*new));
 113     new->id = curid++;
 114     new->size = -1;
 115     new->endpos = -1;
 116     new->filter = -1;
 117     CBCHAININIT(new, trans_ac);
 118     CBCHAININIT(new, trans_act);
 119     CBCHAININIT(new, trans_p);
 120     CBCHAININIT(new, trans_destroy);
 121     CBCHAININIT(new, trans_filterout);
 122     new->next = NULL;
 123     new->prev = NULL;
 124     time(&new->activity);
 125     numtransfers++;
 126     return(new);
 127 }
 128
 129 static void localread(struct socket *sk, struct transfer *transfer)
 130 {
 131     void *buf;
 132     size_t blen;
 133
 134     if((transfer->datapipe != NULL) && (sockqueueleft(transfer->datapipe) > 0)) {
 135         buf = sockgetinbuf(sk, &blen);
 136         sockqueue(transfer->datapipe, buf, blen);
 137         time(&transfer->activity);
 138         transfer->curpos += blen;
 139         bytesupload += blen;
 140         CBCHAINDOCB(transfer, trans_p, transfer);
 141     }
 142 }
 143
 144 static void dataread(struct socket *sk, struct transfer *transfer)
 145 {
 146     void *buf;
 147     size_t blen;
 148
 149     if((transfer->localend != NULL) && (sockqueueleft(transfer->localend) > 0)) {
 150         buf = sockgetinbuf(sk, &blen);
 151         sockqueue(transfer->localend, buf, blen);
 152         transfer->curpos += blen;
 153         bytesdownload += blen;
 154         CBCHAINDOCB(transfer, trans_p, transfer);
 155     }
 156 }
 157
 158 static void localwrite(struct socket *sk, struct transfer *transfer)
 159 {
 160     if(transfer->datapipe != NULL)
 161         dataread(transfer->datapipe, transfer);
 162 }
 163
 164 static void datawrite(struct socket *sk, struct transfer *transfer)
 165 {
 166     if(transfer->localend != NULL)
 167         localread(transfer->localend, transfer);
 168 }
 169
 170 static void localerr(struct socket *sk, int errno, struct transfer *transfer)
 171 {
 172     if(transfer->datapipe != NULL)
 173         closesock(transfer->datapipe);
 174 }
 175
 176 static void dataerr(struct socket *sk, int errno, struct transfer *transfer)
 177 {
 178     if(transfer->curpos >= transfer->size) {
 179         transfersetstate(transfer, TRNS_DONE);
 180         closesock(transfer->localend);
 181         quitsock(transfer->localend);
 182         transfer->localend = NULL;
 183     } else {
 184         resettransfer(transfer);
 185     }
 186 }
 187
 188 void transferattach(struct transfer *transfer, struct socket *dpipe)
 189 {
 190     transferdetach(transfer);
 191     getsock(transfer->datapipe = dpipe);
 192     dpipe->readcb = (void (*)(struct socket *, void *))dataread;
 193     dpipe->writecb = (void (*)(struct socket *, void *))datawrite;
 194     dpipe->errcb = (void (*)(struct socket *, int, void *))dataerr;
 195     dpipe->data = transfer;
 196 }
 197
 198 void transferdetach(struct transfer *transfer)
 199 {
 200     if(transfer->datapipe != NULL) {
 201         closesock(transfer->datapipe);
 202         quitsock(transfer->datapipe);
 203     }
 204     transfer->datapipe = NULL;
 205 }
 206
 207 struct transfer *finddownload(wchar_t *peerid)
 208 {
 209     struct transfer *transfer;
 210
 211     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 212     {
 213         if((transfer->dir == TRNSD_DOWN) && (transfer->datapipe == NULL) && !wcscmp(peerid, transfer->peerid))
 214             break;
 215     }
 216     return(transfer);
 217 }
 218
 219 struct transfer *hasupload(struct fnet *fnet, wchar_t *peerid)
 220 {
 221     struct transfer *transfer;
 222
 223     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 224     {
 225         if((transfer->dir == TRNSD_UP) && (transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 226             break;
 227     }
 228     return(transfer);
 229 }
 230
 231 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct socket *dpipe)
 232 {
 233     struct transfer *transfer;
 234
 235     transfer = newtransfer();
 236     if(fnet != NULL)
 237         transfer->fnet = fnet;
 238     else
 239         transfer->fnet = fn->fnet;
 240     transfer->peerid = swcsdup(nickid);
 241     transfer->state = TRNS_HS;
 242     transfer->dir = TRNSD_UP;
 243     if(fn != NULL)
 244         getfnetnode(transfer->fn = fn);
 245     transferattach(transfer, dpipe);
 246     linktransfer(transfer);
 247     bumptransfer(transfer);
 248     return(transfer);
 249 }
 250
 251 void linktransfer(struct transfer *transfer)
 252 {
 253     transfer->next = transfers;
 254     transfer->prev = NULL;
 255     if(transfers != NULL)
 256         transfers->prev = transfer;
 257     transfers = transfer;
 258     GCBCHAINDOCB(newtransfercb, transfer);
 259 }
 260
 261 void resettransfer(struct transfer *transfer)
 262 {
 263     if(transfer->dir == TRNSD_DOWN)
 264     {
 265         transferdetach(transfer);
 266         killfilter(transfer);
 267         transfersetstate(transfer, TRNS_WAITING);
 268         transfersetactivity(transfer, L"reset");
 269         return;
 270     }
 271 }
 272
 273 struct transfer *findtransfer(int id)
 274 {
 275     struct transfer *transfer;
 276
 277     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 278     {
 279         if(transfer->id == id)
 280             break;
 281     }
 282     return(transfer);
 283 }
 284
 285 static void transexpire(int cancelled, struct transfer *transfer)
 286 {
 287     transfer->etimer = NULL;
 288     if(!cancelled)
 289         bumptransfer(transfer);
 290     else
 291         transfer->timeout = 0;
 292 }
 293
 294 void transferprepul(struct transfer *transfer, off_t size, off_t start, off_t end, struct socket *lesk)
 295 {
 296     transfersetsize(transfer, size);
 297     transfer->curpos = start;
 298     transfer->endpos = end;
 299     transfersetlocalend(transfer, lesk);
 300 }
 301
 302 void transferstartdl(struct transfer *transfer, struct socket *sk)
 303 {
 304     transfersetstate(transfer, TRNS_MAIN);
 305     socksettos(sk, confgetint("transfer", "dltos"));
 306 }
 307
 308 void transferstartul(struct transfer *transfer, struct socket *sk)
 309 {
 310     transfersetstate(transfer, TRNS_MAIN);
 311     socksettos(sk, confgetint("transfer", "ultos"));
 312     if(transfer->localend != NULL)
 313         localread(transfer->localend, transfer);
 314 }
 315
 316 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 317 {
 318     if(transfer->localend != NULL)
 319         putsock(transfer->localend);
 320     getsock(transfer->localend = sk);
 321     sk->data = transfer;
 322     sk->readcb = (void (*)(struct socket *, void *))localread;
 323     sk->writecb = (void (*)(struct socket *, void *))localwrite;
 324     sk->errcb = (void (*)(struct socket *, int, void *))localerr;
 325 }
 326
 327 static int tryreq(struct transfer *transfer)
 328 {
 329     struct fnetnode *fn;
 330     struct fnetpeer *peer;
 331
 332     if((fn = transfer->fn) != NULL)
 333     {
 334         if(fn->state != FNN_EST)
 335         {
 336             transfer->close = 1;
 337             return(1);
 338         }
 339         peer = fnetfindpeer(fn, transfer->peerid);
 340     } else {
 341         peer = NULL;
 342         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 343         {
 344             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 345                 break;
 346         }
 347     }
 348     if(peer != NULL)
 349     {
 350         time(&transfer->lastreq);
 351         return(fn->fnet->reqconn(peer));
 352     }
 353     return(1);
 354 }
 355
 356 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 357 {
 358     struct transfer *transfer;
 359
 360     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 361     {
 362         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 363         {
 364             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 365             {
 366                 if(!tryreq(transfer))
 367                     return;
 368             }
 369         }
 370     }
 371 }
 372
 373 void bumptransfer(struct transfer *transfer)
 374 {
 375     time_t now;
 376
 377     if((now = time(NULL)) < transfer->timeout)
 378     {
 379
 380         if(transfer->etimer == NULL)
 381             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 382         return;
 383     }
 384     if(transfer->etimer != NULL)
 385         canceltimer(transfer->etimer);
 386     switch(transfer->state)
 387     {
 388     case TRNS_WAITING:
 389         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 390         if(now - transfer->lastreq > 30)
 391             tryreq(transfer);
 392         break;
 393     case TRNS_HS:
 394         if(transfer->dir == TRNSD_UP)
 395         {
 396             if(now - transfer->activity < 60)
 397                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 398             else
 399                 transfer->close = 1;
 400         } else if(transfer->dir == TRNSD_DOWN) {
 401             if(now - transfer->activity < 60)
 402                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 403             else
 404                 resettransfer(transfer);
 405         }
 406         break;
 407     case TRNS_MAIN:
 408         if(transfer->dir == TRNSD_UP)
 409         {
 410             if(now - transfer->activity < 300)
 411                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 412             else
 413                 transfer->close = 1;
 414         }
 415         break;
 416     }
 417 }
 418
 419 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 420 {
 421     time(&transfer->activity);
 422     if(desc != NULL)
 423     {
 424         if(transfer->actdesc != NULL)
 425             free(transfer->actdesc);
 426         transfer->actdesc = swcsdup(desc);
 427     }
 428     bumptransfer(transfer);
 429     CBCHAINDOCB(transfer, trans_act, transfer);
 430 }
 431
 432 void transfersetstate(struct transfer *transfer, int newstate)
 433 {
 434     transfer->state = newstate;
 435     if(transfer->etimer != NULL)
 436         canceltimer(transfer->etimer);
 437     transfersetactivity(transfer, NULL);
 438     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 439 }
 440
 441 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 442 {
 443     if(transfer->peernick != NULL)
 444         free(transfer->peernick);
 445     transfer->peernick = swcsdup(newnick);
 446     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 447 }
 448
 449 void transfersetsize(struct transfer *transfer, off_t newsize)
 450 {
 451     transfer->size = newsize;
 452     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 453 }
 454
 455 void transferseterror(struct transfer *transfer, int error)
 456 {
 457     transfer->error = error;
 458     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 459 }
 460
 461 void transfersetpath(struct transfer *transfer, wchar_t *path)
 462 {
 463     if(transfer->path != NULL)
 464         free(transfer->path);
 465     transfer->path = swcsdup(path);
 466     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 467 }
 468
 469 void transfersethash(struct transfer *transfer, struct hash *hash)
 470 {
 471     if(transfer->hash != NULL)
 472         freehash(transfer->hash);
 473     transfer->hash = hash;
 474     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 475 }
 476
 477 int slotsleft(void)
 478 {
 479     struct transfer *transfer;
 480     int slots;
 481
 482     slots = confgetint("transfer", "slots");
 483     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 484     {
 485         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 486             slots--;
 487     }
 488     return(slots);
 489 }
 490
 491 static void killfilter(struct transfer *transfer)
 492 {
 493     if(transfer->filter != -1)
 494     {
 495         kill(-transfer->filter, SIGHUP);
 496         transfer->filter = -1;
 497     }
 498     if(transfer->localend)
 499     {
 500         transfer->localend->readcb = NULL;
 501         transfer->localend->writecb = NULL;
 502         transfer->localend->errcb = NULL;
 503         putsock(transfer->localend);
 504         transfer->localend = NULL;
 505     }
 506     if(transfer->filterout)
 507     {
 508         transfer->filterout->readcb = NULL;
 509         putsock(transfer->filterout);
 510         transfer->filterout = NULL;
 511     }
 512     if(transfer->filterbuf)
 513     {
 514         free(transfer->filterbuf);
 515         transfer->filterbuf = NULL;
 516     }
 517     transfer->filterbufsize = transfer->filterbufdata = 0;
 518 }
 519
 520 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
 521 {
 522     if(!wcscmp(cmd, L"status")) {
 523         if(arg == NULL)
 524             arg = L"";
 525         if(transfer->exitstatus != NULL)
 526             free(transfer->exitstatus);
 527         transfer->exitstatus = swcsdup(arg);
 528     }
 529 }
 530
 531 static void filterread(struct socket *sk, struct transfer *transfer)
 532 {
 533     char *buf, *p, *p2;
 534     size_t bufsize;
 535     wchar_t *cmd, *arg;
 536
 537     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 538         return;
 539     bufcat(transfer->filterbuf, buf, bufsize);
 540     free(buf);
 541     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 542     {
 543         *(p++) = 0;
 544         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 545             *(p2++) = 0;
 546         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 547         {
 548             arg = NULL;
 549             if(p2 != NULL)
 550             {
 551                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 552                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
 553             }
 554             handletranscmd(transfer, cmd, arg);
 555             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 556             if(arg != NULL)
 557                 free(arg);
 558             free(cmd);
 559         } else {
 560             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 561         }
 562         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 563     }
 564 }
 565
 566 static void filterexit(pid_t pid, int status, void *data)
 567 {
 568     struct transfer *transfer;
 569     struct fnet *fnet;
 570     wchar_t *peerid;
 571
 572     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 573     {
 574         if(transfer->filter == pid)
 575         {
 576             transfer->filter = -1;
 577             killfilter(transfer);
 578             fnet = transfer->fnet;
 579             peerid = swcsdup(transfer->peerid);
 580             if(WEXITSTATUS(status))
 581                 resettransfer(transfer);
 582             else
 583                 freetransfer(transfer);
 584             trytransferbypeer(fnet, peerid);
 585             free(peerid);
 586             break;
 587         }
 588     }
 589 }
 590
 591 int forkfilter(struct transfer *transfer)
 592 {
 593     char *filtername, *filename, *peerid, *buf, *p;
 594     wchar_t *wfilename;
 595     struct passwd *pwent;
 596     pid_t pid;
 597     int inpipe, outpipe;
 598     char **argv;
 599     size_t argvsize, argvdata;
 600     struct socket *insock, *outsock;
 601     struct wcspair *ta;
 602     char *rec, *val;
 603
 604     wfilename = fnfilebasename(transfer->path);
 605     if(transfer->auth == NULL)
 606     {
 607         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 608         errno = EACCES;
 609         return(-1);
 610     }
 611     if((pwent = getpwuid(transfer->owner)) == NULL)
 612     {
 613         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 614         errno = EACCES;
 615         return(-1);
 616     }
 617     filtername = findfile("dc-filter", pwent->pw_dir, 0);
 618     if(filtername == NULL)
 619         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
 620     if(filtername == NULL)
 621     {
 622         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 623         errno = ENOENT;
 624         return(-1);
 625     }
 626     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 627     {
 628         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 629         {
 630             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 631             return(-1);
 632         }
 633         filename = sprintf2("utf8-%s", buf);
 634         free(buf);
 635     }
 636     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 637     {
 638         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 639         {
 640             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 641             free(filename);
 642             return(-1);
 643         }
 644         peerid = sprintf2("utf8-%s", buf);
 645         free(buf);
 646     }
 647     for(p = filename; *p; p++) {
 648         if(*p == '/')
 649             *p = '_';
 650         else if((p == filename) && (*p == '.'))
 651             *p = '_';
 652     }
 653     if((pid = forksess(transfer->owner, transfer->auth, filterexit, NULL, FD_PIPE, 0, O_WRONLY, &inpipe, FD_PIPE, 1, O_RDONLY, &outpipe, FD_FILE, 2, O_RDWR, "/dev/null", FD_END)) < 0)
 654     {
 655         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 656         return(-1);
 657     }
 658     if(pid == 0)
 659     {
 660         argv = NULL;
 661         argvsize = argvdata = 0;
 662         buf = sprintf2("%ji", (intmax_t)transfer->size);
 663         addtobuf(argv, filtername);
 664         addtobuf(argv, filename);
 665         addtobuf(argv, buf);
 666         addtobuf(argv, peerid);
 667         if(transfer->hash)
 668         {
 669             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 670             {
 671                 /* XXX: I am very doubtful of this, but it can just as
 672                  * well be argued that all data should be presented as
 673                  * key-value pairs. */
 674                 addtobuf(argv, "hash");
 675                 addtobuf(argv, buf);
 676             } else {
 677                 flog(LOG_WARNING, "could not convert hash to local charset");
 678             }
 679         }
 680         for(ta = transfer->args; ta != NULL; ta = ta->next)
 681         {
 682             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 683                 continue;
 684             if((val = icwcstombs(ta->val, NULL)) == NULL)
 685                 continue;
 686             addtobuf(argv, rec);
 687             addtobuf(argv, val);
 688         }
 689         addtobuf(argv, NULL);
 690         execv(filtername, argv);
 691         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 692         exit(127);
 693     }
 694     insock = wrapsock(inpipe);
 695     outsock = wrapsock(outpipe);
 696     /* Really, really strange thing here - sometimes the kernel would
 697      * return POLLIN on insock, even though it's a write-side
 698      * pipe. The corresponding read on the pipe naturally returns
 699      * EBADF, causing doldacond to think there's something wrong with
 700      * the fd, and thus it closes it. Until I can find out whyever the
 701      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 702      * set ignread on insock for now. */
 703 /*     sockblock(insock, 1); */
 704     transfer->filter = pid;
 705     transfersetlocalend(transfer, insock);
 706     getsock(transfer->filterout = outsock);
 707     outsock->data = transfer;
 708     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 709     putsock(insock);
 710     putsock(outsock);
 711     free(filtername);
 712     free(filename);
 713     free(peerid);
 714     return(0);
 715 }
 716
 717 static int run(void)
 718 {
 719     struct transfer *transfer, *next;
 720
 721     /*
 722     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 723     {
 724         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 725         {
 726             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 727                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 728             closesock(transfer->localend);
 729         }
 730     }
 731     */
 732     for(transfer = transfers; transfer != NULL; transfer = next)
 733     {
 734         next = transfer->next;
 735         if(transfer->close)
 736         {
 737             transferdetach(transfer);
 738             freetransfer(transfer);
 739             continue;
 740         }
 741     }
 742     return(0);
 743 }
 744
 745 static struct configvar myvars[] =
 746 {
 747     /** The maximum number of simultaneously permitted uploads. A
 748      * common hub rule is that you will need at least as many slots as
 749      * the number of hubs to which you are connected. */
 750     {CONF_VAR_INT, "slots", {.num = 3}},
 751     /** The TOS value to use for upload connections (see the TOS
 752      * VALUES section). */
 753     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 754     /** The TOS value to use for download connections (see the TOS
 755      * VALUES section). */
 756     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 757     /** The name of the filter script (see the FILES section for
 758      * lookup information). */
 759     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 760     /** If true, only one upload is allowed per remote peer. This
 761      * option is still experimental, so it is recommended to leave it
 762      * off. */
 763     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
 764     {CONF_VAR_END}
 765 };
 766
 767 static struct module me =
 768 {
 769     .conf =
 770     {
 771         .vars = myvars
 772     },
 773     .name = "transfer",
 774     .run = run
 775 };
 776
 777 MODULE(me);