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     off_t curpos;
 134
 135     if((transfer->datapipe != NULL) && (sockqueueleft(transfer->datapipe) > 0)) {
 136         buf = sockgetinbuf(sk, &blen);
 137         if((transfer->endpos >= 0) && (transfer->localpos + blen > transfer->endpos))
 138             blen = transfer->endpos - transfer->localpos;
 139         sockqueue(transfer->datapipe, buf, blen);
 140         free(buf);
 141         time(&transfer->activity);
 142         transfer->localpos += blen;
 143         bytesupload += blen;
 144     }
 145     if((curpos = transfer->localpos - socktqueuesize(transfer->datapipe)) < 0)
 146         curpos = 0;
 147     if(curpos != transfer->curpos) {
 148         transfer->curpos = curpos;
 149         CBCHAINDOCB(transfer, trans_p, transfer);
 150     }
 151 }
 152
 153 static void dataread(struct socket *sk, struct transfer *transfer)
 154 {
 155     void *buf;
 156     size_t blen;
 157
 158     if((transfer->localend != NULL) && (sockqueueleft(transfer->localend) > 0)) {
 159         buf = sockgetinbuf(sk, &blen);
 160         if((transfer->endpos >= 0) && (transfer->curpos + blen > transfer->endpos))
 161             blen = transfer->endpos - transfer->curpos;
 162         sockqueue(transfer->localend, buf, blen);
 163         free(buf);
 164         transfer->curpos += blen;
 165         bytesdownload += blen;
 166         CBCHAINDOCB(transfer, trans_p, transfer);
 167     }
 168 }
 169
 170 static void localwrite(struct socket *sk, struct transfer *transfer)
 171 {
 172     if(transfer->datapipe != NULL)
 173         dataread(transfer->datapipe, transfer);
 174 }
 175
 176 static void datawrite(struct socket *sk, struct transfer *transfer)
 177 {
 178     if(transfer->localend != NULL)
 179         localread(transfer->localend, transfer);
 180 }
 181
 182 static void localerr(struct socket *sk, int errno, struct transfer *transfer)
 183 {
 184     if(transfer->datapipe != NULL)
 185         closesock(transfer->datapipe);
 186 }
 187
 188 static void dataerr(struct socket *sk, int errno, struct transfer *transfer)
 189 {
 190     if(transfer->dir == TRNSD_DOWN) {
 191         if(transfer->curpos >= transfer->size) {
 192             transfersetstate(transfer, TRNS_DONE);
 193             if(transfer->localend != NULL) {
 194                 closesock(transfer->localend);
 195                 quitsock(transfer->localend);
 196                 transfer->localend = NULL;
 197             }
 198         } else {
 199             resettransfer(transfer);
 200         }
 201     } else if(transfer->dir == TRNSD_UP) {
 202         transfer->close = 1;
 203     }
 204 }
 205
 206 void transferattach(struct transfer *transfer, struct socket *dpipe)
 207 {
 208     transferdetach(transfer);
 209     getsock(transfer->datapipe = dpipe);
 210     dpipe->readcb = (void (*)(struct socket *, void *))dataread;
 211     dpipe->writecb = (void (*)(struct socket *, void *))datawrite;
 212     dpipe->errcb = (void (*)(struct socket *, int, void *))dataerr;
 213     dpipe->data = transfer;
 214 }
 215
 216 void transferdetach(struct transfer *transfer)
 217 {
 218     if(transfer->datapipe != NULL) {
 219         closesock(transfer->datapipe);
 220         quitsock(transfer->datapipe);
 221     }
 222     transfer->datapipe = NULL;
 223 }
 224
 225 struct transfer *finddownload(wchar_t *peerid)
 226 {
 227     struct transfer *transfer;
 228
 229     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 230     {
 231         if((transfer->dir == TRNSD_DOWN) && (transfer->datapipe == NULL) && !wcscmp(peerid, transfer->peerid))
 232             break;
 233     }
 234     return(transfer);
 235 }
 236
 237 struct transfer *hasupload(struct fnet *fnet, wchar_t *peerid)
 238 {
 239     struct transfer *transfer;
 240
 241     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 242     {
 243         if((transfer->dir == TRNSD_UP) && (transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 244             break;
 245     }
 246     return(transfer);
 247 }
 248
 249 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct socket *dpipe)
 250 {
 251     struct transfer *transfer;
 252
 253     transfer = newtransfer();
 254     if(fnet != NULL)
 255         transfer->fnet = fnet;
 256     else
 257         transfer->fnet = fn->fnet;
 258     transfer->peerid = swcsdup(nickid);
 259     transfer->state = TRNS_HS;
 260     transfer->dir = TRNSD_UP;
 261     if(fn != NULL)
 262         getfnetnode(transfer->fn = fn);
 263     transferattach(transfer, dpipe);
 264     linktransfer(transfer);
 265     bumptransfer(transfer);
 266     return(transfer);
 267 }
 268
 269 void linktransfer(struct transfer *transfer)
 270 {
 271     transfer->next = transfers;
 272     transfer->prev = NULL;
 273     if(transfers != NULL)
 274         transfers->prev = transfer;
 275     transfers = transfer;
 276     GCBCHAINDOCB(newtransfercb, transfer);
 277 }
 278
 279 void resettransfer(struct transfer *transfer)
 280 {
 281     if(transfer->dir == TRNSD_DOWN)
 282     {
 283         transferdetach(transfer);
 284         killfilter(transfer);
 285         transfersetstate(transfer, TRNS_WAITING);
 286         transfersetactivity(transfer, L"reset");
 287         return;
 288     }
 289 }
 290
 291 struct transfer *findtransfer(int id)
 292 {
 293     struct transfer *transfer;
 294
 295     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 296     {
 297         if(transfer->id == id)
 298             break;
 299     }
 300     return(transfer);
 301 }
 302
 303 static void transexpire(int cancelled, struct transfer *transfer)
 304 {
 305     transfer->etimer = NULL;
 306     if(!cancelled)
 307         bumptransfer(transfer);
 308     else
 309         transfer->timeout = 0;
 310 }
 311
 312 void transferprepul(struct transfer *transfer, off_t size, off_t start, off_t end, struct socket *lesk)
 313 {
 314     transfersetsize(transfer, size);
 315     transfer->curpos = transfer->localpos = start;
 316     transfer->endpos = end;
 317     transfersetlocalend(transfer, lesk);
 318 }
 319
 320 void transferstartdl(struct transfer *transfer, struct socket *sk)
 321 {
 322     transfersetstate(transfer, TRNS_MAIN);
 323     socksettos(sk, confgetint("transfer", "dltos"));
 324 }
 325
 326 void transferstartul(struct transfer *transfer, struct socket *sk)
 327 {
 328     transfersetstate(transfer, TRNS_MAIN);
 329     socksettos(sk, confgetint("transfer", "ultos"));
 330     if(transfer->localend != NULL)
 331         localread(transfer->localend, transfer);
 332 }
 333
 334 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 335 {
 336     if(transfer->localend != NULL)
 337         putsock(transfer->localend);
 338     getsock(transfer->localend = sk);
 339     sk->data = transfer;
 340     sk->readcb = (void (*)(struct socket *, void *))localread;
 341     sk->writecb = (void (*)(struct socket *, void *))localwrite;
 342     sk->errcb = (void (*)(struct socket *, int, void *))localerr;
 343 }
 344
 345 static int tryreq(struct transfer *transfer)
 346 {
 347     struct fnetnode *fn;
 348     struct fnetpeer *peer;
 349
 350     if((fn = transfer->fn) != NULL)
 351     {
 352         if(fn->state != FNN_EST)
 353         {
 354             transfer->close = 1;
 355             return(1);
 356         }
 357         peer = fnetfindpeer(fn, transfer->peerid);
 358     } else {
 359         peer = NULL;
 360         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 361         {
 362             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 363                 break;
 364         }
 365     }
 366     if(peer != NULL)
 367     {
 368         time(&transfer->lastreq);
 369         return(fn->fnet->reqconn(peer));
 370     }
 371     return(1);
 372 }
 373
 374 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 375 {
 376     struct transfer *transfer;
 377
 378     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 379     {
 380         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 381         {
 382             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 383             {
 384                 if(!tryreq(transfer))
 385                     return;
 386             }
 387         }
 388     }
 389 }
 390
 391 void bumptransfer(struct transfer *transfer)
 392 {
 393     time_t now;
 394
 395     if((now = time(NULL)) < transfer->timeout)
 396     {
 397
 398         if(transfer->etimer == NULL)
 399             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 400         return;
 401     }
 402     if(transfer->etimer != NULL)
 403         canceltimer(transfer->etimer);
 404     switch(transfer->state)
 405     {
 406     case TRNS_WAITING:
 407         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 408         if(now - transfer->lastreq > 30)
 409             tryreq(transfer);
 410         break;
 411     case TRNS_HS:
 412         if(transfer->dir == TRNSD_UP)
 413         {
 414             if(now - transfer->activity < 60)
 415                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 416             else
 417                 transfer->close = 1;
 418         } else if(transfer->dir == TRNSD_DOWN) {
 419             if(now - transfer->activity < 60)
 420                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 421             else
 422                 resettransfer(transfer);
 423         }
 424         break;
 425     case TRNS_MAIN:
 426         if(transfer->dir == TRNSD_UP)
 427         {
 428             if(now - transfer->activity < 300)
 429                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 430             else
 431                 transfer->close = 1;
 432         }
 433         break;
 434     }
 435 }
 436
 437 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 438 {
 439     time(&transfer->activity);
 440     if(desc != NULL)
 441     {
 442         if(transfer->actdesc != NULL)
 443             free(transfer->actdesc);
 444         transfer->actdesc = swcsdup(desc);
 445     }
 446     bumptransfer(transfer);
 447     CBCHAINDOCB(transfer, trans_act, transfer);
 448 }
 449
 450 void transfersetstate(struct transfer *transfer, int newstate)
 451 {
 452     transfer->state = newstate;
 453     if(transfer->etimer != NULL)
 454         canceltimer(transfer->etimer);
 455     transfersetactivity(transfer, NULL);
 456     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 457 }
 458
 459 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 460 {
 461     if(transfer->peernick != NULL)
 462         free(transfer->peernick);
 463     transfer->peernick = swcsdup(newnick);
 464     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 465 }
 466
 467 void transfersetsize(struct transfer *transfer, off_t newsize)
 468 {
 469     transfer->size = newsize;
 470     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 471 }
 472
 473 void transferseterror(struct transfer *transfer, int error)
 474 {
 475     transfer->error = error;
 476     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 477 }
 478
 479 void transfersetpath(struct transfer *transfer, wchar_t *path)
 480 {
 481     if(transfer->path != NULL)
 482         free(transfer->path);
 483     transfer->path = swcsdup(path);
 484     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 485 }
 486
 487 void transfersethash(struct transfer *transfer, struct hash *hash)
 488 {
 489     if(transfer->hash != NULL)
 490         freehash(transfer->hash);
 491     transfer->hash = hash;
 492     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 493 }
 494
 495 int slotsleft(void)
 496 {
 497     struct transfer *transfer;
 498     int slots;
 499
 500     slots = confgetint("transfer", "slots");
 501     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 502     {
 503         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 504             slots--;
 505     }
 506     return(slots);
 507 }
 508
 509 static void killfilter(struct transfer *transfer)
 510 {
 511     if(transfer->filter != -1)
 512     {
 513         kill(-transfer->filter, SIGHUP);
 514         transfer->filter = -1;
 515     }
 516     if(transfer->localend)
 517     {
 518         transfer->localend->readcb = NULL;
 519         transfer->localend->writecb = NULL;
 520         transfer->localend->errcb = NULL;
 521         putsock(transfer->localend);
 522         transfer->localend = NULL;
 523     }
 524     if(transfer->filterout)
 525     {
 526         transfer->filterout->readcb = NULL;
 527         putsock(transfer->filterout);
 528         transfer->filterout = NULL;
 529     }
 530     if(transfer->filterbuf)
 531     {
 532         free(transfer->filterbuf);
 533         transfer->filterbuf = NULL;
 534     }
 535     transfer->filterbufsize = transfer->filterbufdata = 0;
 536 }
 537
 538 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
 539 {
 540     if(!wcscmp(cmd, L"status")) {
 541         if(arg == NULL)
 542             arg = L"";
 543         if(transfer->exitstatus != NULL)
 544             free(transfer->exitstatus);
 545         transfer->exitstatus = swcsdup(arg);
 546     }
 547 }
 548
 549 static void filterread(struct socket *sk, struct transfer *transfer)
 550 {
 551     char *buf, *p, *p2;
 552     size_t bufsize;
 553     wchar_t *cmd, *arg;
 554
 555     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 556         return;
 557     bufcat(transfer->filterbuf, buf, bufsize);
 558     free(buf);
 559     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 560     {
 561         *(p++) = 0;
 562         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 563             *(p2++) = 0;
 564         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 565         {
 566             arg = NULL;
 567             if(p2 != NULL)
 568             {
 569                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 570                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
 571             }
 572             handletranscmd(transfer, cmd, arg);
 573             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 574             if(arg != NULL)
 575                 free(arg);
 576             free(cmd);
 577         } else {
 578             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 579         }
 580         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 581     }
 582 }
 583
 584 static void filterexit(pid_t pid, int status, void *data)
 585 {
 586     struct transfer *transfer;
 587     struct fnet *fnet;
 588     wchar_t *peerid;
 589
 590     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 591     {
 592         if(transfer->filter == pid)
 593         {
 594             transfer->filter = -1;
 595             killfilter(transfer);
 596             fnet = transfer->fnet;
 597             peerid = swcsdup(transfer->peerid);
 598             if(WEXITSTATUS(status))
 599                 resettransfer(transfer);
 600             else
 601                 freetransfer(transfer);
 602             trytransferbypeer(fnet, peerid);
 603             free(peerid);
 604             break;
 605         }
 606     }
 607 }
 608
 609 int forkfilter(struct transfer *transfer)
 610 {
 611     char *filtername, *filename, *peerid, *buf, *p;
 612     wchar_t *wfilename;
 613     struct passwd *pwent;
 614     pid_t pid;
 615     int inpipe, outpipe;
 616     char **argv;
 617     size_t argvsize, argvdata;
 618     struct socket *insock, *outsock;
 619     struct wcspair *ta;
 620     char *rec, *val;
 621
 622     wfilename = fnfilebasename(transfer->path);
 623     if(transfer->auth == NULL)
 624     {
 625         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 626         errno = EACCES;
 627         return(-1);
 628     }
 629     if((pwent = getpwuid(transfer->owner)) == NULL)
 630     {
 631         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 632         errno = EACCES;
 633         return(-1);
 634     }
 635     filtername = findfile("dc-filter", pwent->pw_dir, 0);
 636     if(filtername == NULL)
 637         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
 638     if(filtername == NULL)
 639     {
 640         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 641         errno = ENOENT;
 642         return(-1);
 643     }
 644     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 645     {
 646         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 647         {
 648             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 649             return(-1);
 650         }
 651         filename = sprintf2("utf8-%s", buf);
 652         free(buf);
 653     }
 654     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 655     {
 656         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 657         {
 658             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 659             free(filename);
 660             return(-1);
 661         }
 662         peerid = sprintf2("utf8-%s", buf);
 663         free(buf);
 664     }
 665     for(p = filename; *p; p++) {
 666         if(*p == '/')
 667             *p = '_';
 668         else if((p == filename) && (*p == '.'))
 669             *p = '_';
 670     }
 671     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)
 672     {
 673         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 674         return(-1);
 675     }
 676     if(pid == 0)
 677     {
 678         argv = NULL;
 679         argvsize = argvdata = 0;
 680         buf = sprintf2("%ji", (intmax_t)transfer->size);
 681         addtobuf(argv, filtername);
 682         addtobuf(argv, filename);
 683         addtobuf(argv, buf);
 684         addtobuf(argv, peerid);
 685         if(transfer->hash)
 686         {
 687             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 688             {
 689                 /* XXX: I am very doubtful of this, but it can just as
 690                  * well be argued that all data should be presented as
 691                  * key-value pairs. */
 692                 addtobuf(argv, "hash");
 693                 addtobuf(argv, buf);
 694             } else {
 695                 flog(LOG_WARNING, "could not convert hash to local charset");
 696             }
 697         }
 698         for(ta = transfer->args; ta != NULL; ta = ta->next)
 699         {
 700             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 701                 continue;
 702             if((val = icwcstombs(ta->val, NULL)) == NULL)
 703                 continue;
 704             addtobuf(argv, rec);
 705             addtobuf(argv, val);
 706         }
 707         addtobuf(argv, NULL);
 708         execv(filtername, argv);
 709         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 710         exit(127);
 711     }
 712     insock = wrapsock(inpipe);
 713     outsock = wrapsock(outpipe);
 714     /* Really, really strange thing here - sometimes the kernel would
 715      * return POLLIN on insock, even though it's a write-side
 716      * pipe. The corresponding read on the pipe naturally returns
 717      * EBADF, causing doldacond to think there's something wrong with
 718      * the fd, and thus it closes it. Until I can find out whyever the
 719      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 720      * set ignread on insock for now. */
 721 /*     sockblock(insock, 1); */
 722     transfer->filter = pid;
 723     transfersetlocalend(transfer, insock);
 724     getsock(transfer->filterout = outsock);
 725     outsock->data = transfer;
 726     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 727     putsock(insock);
 728     putsock(outsock);
 729     free(filtername);
 730     free(filename);
 731     free(peerid);
 732     return(0);
 733 }
 734
 735 static int run(void)
 736 {
 737     struct transfer *transfer, *next;
 738
 739     /*
 740     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 741     {
 742         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 743         {
 744             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 745                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 746             closesock(transfer->localend);
 747         }
 748     }
 749     */
 750     for(transfer = transfers; transfer != NULL; transfer = next)
 751     {
 752         next = transfer->next;
 753         if(transfer->close)
 754         {
 755             transferdetach(transfer);
 756             freetransfer(transfer);
 757             continue;
 758         }
 759     }
 760     return(0);
 761 }
 762
 763 static struct configvar myvars[] =
 764 {
 765     /** The maximum number of simultaneously permitted uploads. A
 766      * common hub rule is that you will need at least as many slots as
 767      * the number of hubs to which you are connected. */
 768     {CONF_VAR_INT, "slots", {.num = 3}},
 769     /** The TOS value to use for upload connections (see the TOS
 770      * VALUES section). */
 771     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 772     /** The TOS value to use for download connections (see the TOS
 773      * VALUES section). */
 774     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 775     /** The name of the filter script (see the FILES section for
 776      * lookup information). */
 777     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 778     /** If true, only one upload is allowed per remote peer. This
 779      * option is still experimental, so it is recommended to leave it
 780      * off. */
 781     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
 782     {CONF_VAR_END}
 783 };
 784
 785 static struct module me =
 786 {
 787     .conf =
 788     {
 789         .vars = myvars
 790     },
 791     .name = "transfer",
 792     .run = run
 793 };
 794
 795 MODULE(me);