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
  30 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33 #include "log.h"
  34 #include "utils.h"
  35 #include "sysevents.h"
  36 #include "auth.h"
  37 #include "transfer.h"
  38 #include "module.h"
  39 #include "client.h"
  40
  41 static void killfilter(struct transfer *transfer);
  42
  43 struct transfer *transfers = NULL;
  44 int numtransfers = 0;
  45 GCBCHAIN(newtransfercb, struct transfer *);
  46
  47 void freetransfer(struct transfer *transfer)
  48 {
  49     if(transfer == transfers)
  50         transfers = transfer->next;
  51     if(transfer->next != NULL)
  52         transfer->next->prev = transfer->prev;
  53     if(transfer->prev != NULL)
  54         transfer->prev->next = transfer->next;
  55     CBCHAINDOCB(transfer, trans_destroy, transfer);
  56     CBCHAINFREE(transfer, trans_ac);
  57     CBCHAINFREE(transfer, trans_act);
  58     CBCHAINFREE(transfer, trans_p);
  59     CBCHAINFREE(transfer, trans_destroy);
  60     CBCHAINFREE(transfer, trans_filterout);
  61     while(transfer->args != NULL)
  62         freewcspair(transfer->args, &transfer->args);
  63     if(transfer->filter != -1)
  64         killfilter(transfer);
  65     if(transfer->etimer != NULL)
  66         canceltimer(transfer->etimer);
  67     if(transfer->auth != NULL)
  68         authputhandle(transfer->auth);
  69     if(transfer->peerid != NULL)
  70         free(transfer->peerid);
  71     if(transfer->peernick != NULL)
  72         free(transfer->peernick);
  73     if(transfer->path != NULL)
  74         free(transfer->path);
  75     if(transfer->actdesc != NULL)
  76         free(transfer->actdesc);
  77     if(transfer->filterbuf != NULL)
  78         free(transfer->filterbuf);
  79     if(transfer->hash != NULL)
  80         freehash(transfer->hash);
  81     if(transfer->localend != NULL)
  82     {
  83         transfer->localend->readcb = NULL;
  84         transfer->localend->writecb = NULL;
  85         transfer->localend->errcb = NULL;
  86         putsock(transfer->localend);
  87     }
  88     if(transfer->filterout != NULL)
  89     {
  90         transfer->filterout->readcb = NULL;
  91         transfer->filterout->writecb = NULL;
  92         transfer->filterout->errcb = NULL;
  93         putsock(transfer->filterout);
  94     }
  95     if(transfer->fn != NULL)
  96         putfnetnode(transfer->fn);
  97     free(transfer);
  98     numtransfers--;
  99 }
 100
 101 struct transfer *newtransfer(void)
 102 {
 103     struct transfer *new;
 104     static int curid = 0;
 105
 106     new = smalloc(sizeof(*new));
 107     memset(new, 0, sizeof(*new));
 108     new->id = curid++;
 109     new->size = -1;
 110     new->endpos = -1;
 111     new->filter = -1;
 112     CBCHAININIT(new, trans_ac);
 113     CBCHAININIT(new, trans_act);
 114     CBCHAININIT(new, trans_p);
 115     CBCHAININIT(new, trans_destroy);
 116     CBCHAININIT(new, trans_filterout);
 117     new->next = NULL;
 118     new->prev = NULL;
 119     time(&new->activity);
 120     numtransfers++;
 121     return(new);
 122 }
 123
 124 void transferattach(struct transfer *transfer, struct transferiface *iface, void *data)
 125 {
 126     if(transfer->iface != NULL)
 127         transferdetach(transfer);
 128     transfer->iface = iface;
 129     transfer->ifacedata = data;
 130 }
 131
 132 void transferdetach(struct transfer *transfer)
 133 {
 134     if(transfer->iface != NULL)
 135     {
 136         transfer->iface->detach(transfer, transfer->ifacedata);
 137         transfer->iface = NULL;
 138         transfer->ifacedata = NULL;
 139     }
 140 }
 141
 142 struct transfer *finddownload(wchar_t *peerid)
 143 {
 144     struct transfer *transfer;
 145
 146     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 147     {
 148         if((transfer->dir == TRNSD_DOWN) && (transfer->iface == NULL) && !wcscmp(peerid, transfer->peerid))
 149             break;
 150     }
 151     return(transfer);
 152 }
 153
 154 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct transferiface *iface, void *data)
 155 {
 156     struct transfer *transfer;
 157
 158     transfer = newtransfer();
 159     if(fnet != NULL)
 160         transfer->fnet = fnet;
 161     else
 162         transfer->fnet = fn->fnet;
 163     transfer->peerid = swcsdup(nickid);
 164     transfer->state = TRNS_HS;
 165     transfer->dir = TRNSD_UP;
 166     if(fn != NULL)
 167         getfnetnode(transfer->fn = fn);
 168     transferattach(transfer, iface, data);
 169     linktransfer(transfer);
 170     bumptransfer(transfer);
 171     return(transfer);
 172 }
 173
 174 void linktransfer(struct transfer *transfer)
 175 {
 176     transfer->next = transfers;
 177     transfer->prev = NULL;
 178     if(transfers != NULL)
 179         transfers->prev = transfer;
 180     transfers = transfer;
 181     GCBCHAINDOCB(newtransfercb, transfer);
 182 }
 183
 184 void resettransfer(struct transfer *transfer)
 185 {
 186     if(transfer->dir == TRNSD_DOWN)
 187     {
 188         if(transfer->iface != NULL)
 189             transferdetach(transfer);
 190         killfilter(transfer);
 191         transfersetstate(transfer, TRNS_WAITING);
 192         transfersetactivity(transfer, L"reset");
 193         return;
 194     }
 195 }
 196
 197 struct transfer *findtransfer(int id)
 198 {
 199     struct transfer *transfer;
 200
 201     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 202     {
 203         if(transfer->id == id)
 204             break;
 205     }
 206     return(transfer);
 207 }
 208
 209 static void transexpire(int cancelled, struct transfer *transfer)
 210 {
 211     transfer->etimer = NULL;
 212     if(!cancelled)
 213         bumptransfer(transfer);
 214     else
 215         transfer->timeout = 0;
 216 }
 217
 218 static void transferread(struct socket *sk, struct transfer *transfer)
 219 {
 220     if(sockgetdatalen(sk) >= 65536)
 221         sk->ignread = 1;
 222     if((transfer->iface != NULL) && (transfer->iface->gotdata != NULL))
 223         transfer->iface->gotdata(transfer, transfer->ifacedata);
 224 }
 225
 226 static void transferwrite(struct socket *sk, struct transfer *transfer)
 227 {
 228     if((transfer->iface != NULL) && (transfer->iface->wantdata != NULL))
 229         transfer->iface->wantdata(transfer, transfer->ifacedata);
 230 }
 231
 232 static void transfererr(struct socket *sk, int errno, struct transfer *transfer)
 233 {
 234     if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 235         transfer->iface->endofdata(transfer, transfer->ifacedata);
 236 }
 237
 238 void transferputdata(struct transfer *transfer, void *buf, size_t size)
 239 {
 240     time(&transfer->activity);
 241     sockqueue(transfer->localend, buf, size);
 242     transfer->curpos += size;
 243     CBCHAINDOCB(transfer, trans_p, transfer);
 244 }
 245
 246 void transferendofdata(struct transfer *transfer)
 247 {
 248     if(transfer->curpos >= transfer->size)
 249     {
 250         transfersetstate(transfer, TRNS_DONE);
 251         transfer->localend->readcb = NULL;
 252         transfer->localend->writecb = NULL;
 253         transfer->localend->errcb = NULL;
 254         putsock(transfer->localend);
 255         transfer->localend = NULL;
 256     } else {
 257         resettransfer(transfer);
 258     }
 259 }
 260
 261 size_t transferdatasize(struct transfer *transfer)
 262 {
 263     return(sockqueuesize(transfer->localend));
 264 }
 265
 266 void *transfergetdata(struct transfer *transfer, size_t *size)
 267 {
 268     void *buf;
 269
 270     if(transfer->localend == NULL)
 271         return(NULL);
 272     transfer->localend->ignread = 0;
 273     time(&transfer->activity);
 274     if((buf = sockgetinbuf(transfer->localend, size)) == NULL)
 275         return(NULL);
 276     if((transfer->endpos >= 0) && (transfer->curpos + *size >= transfer->endpos))
 277     {
 278         *size = transfer->endpos - transfer->curpos;
 279         buf = srealloc(buf, *size);
 280     }
 281     transfer->curpos += *size;
 282     CBCHAINDOCB(transfer, trans_p, transfer);
 283     return(buf);
 284 }
 285
 286 void transferprepul(struct transfer *transfer, size_t size, size_t start, size_t end, struct socket *lesk)
 287 {
 288     transfersetsize(transfer, size);
 289     transfer->curpos = start;
 290     transfer->endpos = end;
 291     lesk->ignread = 1;
 292     transfersetlocalend(transfer, lesk);
 293 }
 294
 295 void transferstartdl(struct transfer *transfer, struct socket *sk)
 296 {
 297     transfersetstate(transfer, TRNS_MAIN);
 298     socksettos(sk, confgetint("transfer", "dltos"));
 299 }
 300
 301 void transferstartul(struct transfer *transfer, struct socket *sk)
 302 {
 303     transfersetstate(transfer, TRNS_MAIN);
 304     socksettos(sk, confgetint("transfer", "ultos"));
 305     if(transfer->localend != NULL)
 306         transfer->localend->ignread = 0;
 307 }
 308
 309 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 310 {
 311     if(transfer->localend != NULL)
 312         putsock(transfer->localend);
 313     getsock(transfer->localend = sk);
 314     sk->data = transfer;
 315     sk->readcb = (void (*)(struct socket *, void *))transferread;
 316     sk->writecb = (void (*)(struct socket *, void *))transferwrite;
 317     sk->errcb = (void (*)(struct socket *, int, void *))transfererr;
 318 }
 319
 320 static int tryreq(struct transfer *transfer)
 321 {
 322     struct fnetnode *fn;
 323     struct fnetpeer *peer;
 324
 325     if((fn = transfer->fn) != NULL)
 326     {
 327         if(fn->state != FNN_EST)
 328         {
 329             transfer->close = 1;
 330             return(1);
 331         }
 332         peer = fnetfindpeer(fn, transfer->peerid);
 333     } else {
 334         peer = NULL;
 335         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 336         {
 337             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 338                 break;
 339         }
 340     }
 341     if(peer != NULL)
 342         return(fn->fnet->reqconn(peer));
 343     return(1);
 344 }
 345
 346 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 347 {
 348     struct transfer *transfer;
 349
 350     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 351     {
 352         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 353         {
 354             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 355             {
 356                 if(!tryreq(transfer))
 357                     return;
 358             }
 359         }
 360     }
 361 }
 362
 363 void bumptransfer(struct transfer *transfer)
 364 {
 365     time_t now;
 366
 367     if((now = time(NULL)) < transfer->timeout)
 368     {
 369
 370         if(transfer->etimer == NULL)
 371             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 372         return;
 373     }
 374     if(transfer->etimer != NULL)
 375         canceltimer(transfer->etimer);
 376     switch(transfer->state)
 377     {
 378     case TRNS_WAITING:
 379         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 380         if(now - transfer->lastreq > 30)
 381             tryreq(transfer);
 382         break;
 383     case TRNS_HS:
 384         if(transfer->dir == TRNSD_UP)
 385         {
 386             if(now - transfer->activity < 60)
 387                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 388             else
 389                 transfer->close = 1;
 390         } else if(transfer->dir == TRNSD_DOWN) {
 391             if(now - transfer->activity < 60)
 392                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 393             else
 394                 resettransfer(transfer);
 395         }
 396         break;
 397     case TRNS_MAIN:
 398         if(transfer->dir == TRNSD_UP)
 399         {
 400             if(now - transfer->activity < 300)
 401                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 402             else
 403                 transfer->close = 1;
 404         }
 405         break;
 406     }
 407 }
 408
 409 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 410 {
 411     time(&transfer->activity);
 412     if(desc != NULL)
 413     {
 414         if(transfer->actdesc != NULL)
 415             free(transfer->actdesc);
 416         transfer->actdesc = swcsdup(desc);
 417     }
 418     bumptransfer(transfer);
 419     CBCHAINDOCB(transfer, trans_act, transfer);
 420 }
 421
 422 void transfersetstate(struct transfer *transfer, int newstate)
 423 {
 424     transfer->state = newstate;
 425     if(transfer->etimer != NULL)
 426         canceltimer(transfer->etimer);
 427     transfersetactivity(transfer, NULL);
 428     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 429 }
 430
 431 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 432 {
 433     if(transfer->peernick != NULL)
 434         free(transfer->peernick);
 435     transfer->peernick = swcsdup(newnick);
 436     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 437 }
 438
 439 void transfersetsize(struct transfer *transfer, int newsize)
 440 {
 441     transfer->size = newsize;
 442     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 443 }
 444
 445 void transferseterror(struct transfer *transfer, int error)
 446 {
 447     transfer->error = error;
 448     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 449 }
 450
 451 void transfersetpath(struct transfer *transfer, wchar_t *path)
 452 {
 453     if(transfer->path != NULL)
 454         free(transfer->path);
 455     transfer->path = swcsdup(path);
 456     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 457 }
 458
 459 void transfersethash(struct transfer *transfer, struct hash *hash)
 460 {
 461     if(transfer->hash != NULL)
 462         freehash(transfer->hash);
 463     transfer->hash = hash;
 464     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 465 }
 466
 467 int slotsleft(void)
 468 {
 469     struct transfer *transfer;
 470     int slots;
 471
 472     slots = confgetint("transfer", "slots");
 473     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 474     {
 475         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 476             slots--;
 477     }
 478     return(slots);
 479 }
 480
 481 static void killfilter(struct transfer *transfer)
 482 {
 483     if(transfer->filter != -1)
 484     {
 485         kill(-transfer->filter, SIGHUP);
 486         transfer->filter = -1;
 487     }
 488     if(transfer->localend)
 489     {
 490         transfer->localend->readcb = NULL;
 491         transfer->localend->writecb = NULL;
 492         transfer->localend->errcb = NULL;
 493         putsock(transfer->localend);
 494         transfer->localend = NULL;
 495     }
 496     if(transfer->filterout)
 497     {
 498         transfer->filterout->readcb = NULL;
 499         putsock(transfer->filterout);
 500         transfer->filterout = NULL;
 501     }
 502     if(transfer->filterbuf)
 503     {
 504         free(transfer->filterbuf);
 505         transfer->filterbuf = NULL;
 506     }
 507     transfer->filterbufsize = transfer->filterbufdata = 0;
 508 }
 509
 510 static char *findfilter(struct passwd *pwd)
 511 {
 512     char *path, *filtername;
 513
 514     if((path = sprintf2("%s/.dcdl-filter", pwd->pw_dir)) != NULL)
 515     {
 516         if(!access(path, X_OK))
 517             return(path);
 518         free(path);
 519     }
 520     if((filtername = icwcstombs(confgetstr("transfer", "filter"), NULL)) == NULL)
 521     {
 522         flog(LOG_WARNING, "could not convert filter name into local charset: %s", strerror(errno));
 523     } else {
 524         if(strchr(filtername, '/') == NULL)
 525         {
 526             if((path = sprintf2("/etc/%s", filtername)) != NULL)
 527             {
 528                 if(!access(path, X_OK))
 529                 {
 530                     free(filtername);
 531                     return(path);
 532                 }
 533                 free(path);
 534             }
 535             if((path = sprintf2("/usr/etc/%s", filtername)) != NULL)
 536             {
 537                 if(!access(path, X_OK))
 538                 {
 539                     free(filtername);
 540                     return(path);
 541                 }
 542                 free(path);
 543             }
 544             if((path = sprintf2("/usr/local/etc/%s", filtername)) != NULL)
 545             {
 546                 if(!access(path, X_OK))
 547                 {
 548                     free(filtername);
 549                     return(path);
 550                 }
 551                 free(path);
 552             }
 553         } else {
 554             if(!access(filtername, X_OK))
 555                 return(filtername);
 556         }
 557         free(filtername);
 558     }
 559     return(NULL);
 560 }
 561
 562 static void filterread(struct socket *sk, struct transfer *transfer)
 563 {
 564     char *buf, *p, *p2;
 565     size_t bufsize;
 566     wchar_t *cmd, *arg;
 567
 568     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 569         return;
 570     bufcat(transfer->filterbuf, buf, bufsize);
 571     free(buf);
 572     if((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 573     {
 574         *(p++) = 0;
 575         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 576             *(p2++) = 0;
 577         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 578         {
 579             arg = NULL;
 580             if(p2 != NULL)
 581             {
 582                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 583                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 584             }
 585             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 586             if(arg != NULL)
 587                 free(arg);
 588             free(cmd);
 589         } else {
 590             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 591         }
 592         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 593     }
 594 }
 595
 596 static void filterexit(pid_t pid, int status, void *data)
 597 {
 598     struct transfer *transfer;
 599
 600     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 601     {
 602         if(transfer->filter == pid)
 603         {
 604             transfer->filter = -1;
 605             killfilter(transfer);
 606             if(WEXITSTATUS(status))
 607             {
 608                 resettransfer(transfer);
 609             } else {
 610                 freetransfer(transfer);
 611             }
 612             break;
 613         }
 614     }
 615 }
 616
 617 int forkfilter(struct transfer *transfer)
 618 {
 619     char *filtername, *filename, *peerid, *buf;
 620     wchar_t *wfilename;
 621     struct passwd *pwent;
 622     pid_t pid;
 623     int inpipe, outpipe;
 624     char **argv;
 625     size_t argvsize, argvdata;
 626     struct socket *insock, *outsock;
 627     struct wcspair *ta;
 628     char *rec, *val;
 629
 630     wfilename = transfer->path;
 631     if(transfer->fnet->filebasename != NULL)
 632         wfilename = transfer->fnet->filebasename(wfilename);
 633     if(transfer->auth == NULL)
 634     {
 635         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 636         errno = EACCES;
 637         return(-1);
 638     }
 639     if((pwent = getpwuid(transfer->owner)) == NULL)
 640     {
 641         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 642         errno = EACCES;
 643         return(-1);
 644     }
 645     if((filtername = findfilter(pwent)) == NULL)
 646     {
 647         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 648         errno = ENOENT;
 649         return(-1);
 650     }
 651     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 652     {
 653         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 654         {
 655             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 656             return(-1);
 657         }
 658         filename = sprintf2("utf8-%s", buf);
 659         free(buf);
 660     }
 661     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 662     {
 663         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 664         {
 665             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 666             free(filename);
 667             return(-1);
 668         }
 669         peerid = sprintf2("utf8-%s", buf);
 670         free(buf);
 671     }
 672     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)
 673     {
 674         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 675         return(-1);
 676     }
 677     if(pid == 0)
 678     {
 679         argv = NULL;
 680         argvsize = argvdata = 0;
 681         buf = sprintf2("%i", transfer->size);
 682         addtobuf(argv, filtername);
 683         addtobuf(argv, filename);
 684         addtobuf(argv, buf);
 685         addtobuf(argv, peerid);
 686         if(transfer->hash)
 687         {
 688             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 689             {
 690                 /* XXX: I am very doubtful of this, but it can just as
 691                  * well be argued that all data should be presented as
 692                  * key-value pairs. */
 693                 addtobuf(argv, "hash");
 694                 addtobuf(argv, buf);
 695             } else {
 696                 flog(LOG_WARNING, "could not convert hash to local charset");
 697             }
 698         }
 699         for(ta = transfer->args; ta != NULL; ta = ta->next)
 700         {
 701             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 702                 continue;
 703             if((val = icwcstombs(ta->val, NULL)) == NULL)
 704                 continue;
 705             addtobuf(argv, rec);
 706             addtobuf(argv, val);
 707         }
 708         addtobuf(argv, NULL);
 709         execv(filtername, argv);
 710         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 711         exit(127);
 712     }
 713     insock = wrapsock(inpipe);
 714     outsock = wrapsock(outpipe);
 715     /* Really, really strange thing here - sometimes the kernel would
 716      * return POLLIN on insock, even though it's a write-side
 717      * pipe. The corresponding read on the pipe naturally returns
 718      * EBADF, causing doldacond to think there's something wrong with
 719      * the fd, and thus it closes it. Until I can find out whyever the
 720      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 721      * set ignread on insock for now. */
 722     insock->ignread = 1;
 723     transfer->filter = pid;
 724     transfersetlocalend(transfer, insock);
 725     getsock(transfer->filterout = outsock);
 726     outsock->data = transfer;
 727     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 728     putsock(insock);
 729     putsock(outsock);
 730     free(filtername);
 731     free(filename);
 732     free(peerid);
 733     return(0);
 734 }
 735
 736 static int run(void)
 737 {
 738     struct transfer *transfer, *next;
 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     for(transfer = transfers; transfer != NULL; transfer = next)
 750     {
 751         next = transfer->next;
 752         if(transfer->close)
 753         {
 754             transferdetach(transfer);
 755             freetransfer(transfer);
 756             continue;
 757         }
 758     }
 759     return(0);
 760 }
 761
 762 static struct configvar myvars[] =
 763 {
 764     {CONF_VAR_INT, "slots", {.num = 3}},
 765     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 766     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 767     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 768     {CONF_VAR_END}
 769 };
 770
 771 static struct module me =
 772 {
 773     .conf =
 774     {
 775         .vars = myvars
 776     },
 777     .name = "transfer",
 778     .run = run
 779 };
 780
 781 MODULE(me);