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 unsigned long long bytesupload = 0;
  44 unsigned long long bytesdownload = 0;
  45 struct transfer *transfers = NULL;
  46 int numtransfers = 0;
  47 GCBCHAIN(newtransfercb, struct transfer *);
  48
  49 void freetransfer(struct transfer *transfer)
  50 {
  51     if(transfer == transfers)
  52         transfers = transfer->next;
  53     if(transfer->next != NULL)
  54         transfer->next->prev = transfer->prev;
  55     if(transfer->prev != NULL)
  56         transfer->prev->next = transfer->next;
  57     CBCHAINDOCB(transfer, trans_destroy, transfer);
  58     CBCHAINFREE(transfer, trans_ac);
  59     CBCHAINFREE(transfer, trans_act);
  60     CBCHAINFREE(transfer, trans_p);
  61     CBCHAINFREE(transfer, trans_destroy);
  62     CBCHAINFREE(transfer, trans_filterout);
  63     while(transfer->args != NULL)
  64         freewcspair(transfer->args, &transfer->args);
  65     if(transfer->filter != -1)
  66         killfilter(transfer);
  67     if(transfer->etimer != NULL)
  68         canceltimer(transfer->etimer);
  69     if(transfer->auth != NULL)
  70         authputhandle(transfer->auth);
  71     if(transfer->peerid != NULL)
  72         free(transfer->peerid);
  73     if(transfer->peernick != NULL)
  74         free(transfer->peernick);
  75     if(transfer->path != NULL)
  76         free(transfer->path);
  77     if(transfer->actdesc != NULL)
  78         free(transfer->actdesc);
  79     if(transfer->filterbuf != NULL)
  80         free(transfer->filterbuf);
  81     if(transfer->hash != NULL)
  82         freehash(transfer->hash);
  83     if(transfer->localend != NULL)
  84     {
  85         transfer->localend->readcb = NULL;
  86         transfer->localend->writecb = NULL;
  87         transfer->localend->errcb = NULL;
  88         putsock(transfer->localend);
  89     }
  90     if(transfer->filterout != NULL)
  91     {
  92         transfer->filterout->readcb = NULL;
  93         transfer->filterout->writecb = NULL;
  94         transfer->filterout->errcb = NULL;
  95         putsock(transfer->filterout);
  96     }
  97     if(transfer->fn != NULL)
  98         putfnetnode(transfer->fn);
  99     free(transfer);
 100     numtransfers--;
 101 }
 102
 103 struct transfer *newtransfer(void)
 104 {
 105     struct transfer *new;
 106     static int curid = 0;
 107
 108     new = smalloc(sizeof(*new));
 109     memset(new, 0, sizeof(*new));
 110     new->id = curid++;
 111     new->size = -1;
 112     new->endpos = -1;
 113     new->filter = -1;
 114     CBCHAININIT(new, trans_ac);
 115     CBCHAININIT(new, trans_act);
 116     CBCHAININIT(new, trans_p);
 117     CBCHAININIT(new, trans_destroy);
 118     CBCHAININIT(new, trans_filterout);
 119     new->next = NULL;
 120     new->prev = NULL;
 121     time(&new->activity);
 122     numtransfers++;
 123     return(new);
 124 }
 125
 126 void transferattach(struct transfer *transfer, struct transferiface *iface, void *data)
 127 {
 128     if(transfer->iface != NULL)
 129         transferdetach(transfer);
 130     transfer->iface = iface;
 131     transfer->ifacedata = data;
 132 }
 133
 134 void transferdetach(struct transfer *transfer)
 135 {
 136     if(transfer->iface != NULL)
 137     {
 138         transfer->iface->detach(transfer, transfer->ifacedata);
 139         transfer->iface = NULL;
 140         transfer->ifacedata = NULL;
 141     }
 142 }
 143
 144 struct transfer *finddownload(wchar_t *peerid)
 145 {
 146     struct transfer *transfer;
 147
 148     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 149     {
 150         if((transfer->dir == TRNSD_DOWN) && (transfer->iface == NULL) && !wcscmp(peerid, transfer->peerid))
 151             break;
 152     }
 153     return(transfer);
 154 }
 155
 156 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct transferiface *iface, void *data)
 157 {
 158     struct transfer *transfer;
 159
 160     transfer = newtransfer();
 161     if(fnet != NULL)
 162         transfer->fnet = fnet;
 163     else
 164         transfer->fnet = fn->fnet;
 165     transfer->peerid = swcsdup(nickid);
 166     transfer->state = TRNS_HS;
 167     transfer->dir = TRNSD_UP;
 168     if(fn != NULL)
 169         getfnetnode(transfer->fn = fn);
 170     transferattach(transfer, iface, data);
 171     linktransfer(transfer);
 172     bumptransfer(transfer);
 173     return(transfer);
 174 }
 175
 176 void linktransfer(struct transfer *transfer)
 177 {
 178     transfer->next = transfers;
 179     transfer->prev = NULL;
 180     if(transfers != NULL)
 181         transfers->prev = transfer;
 182     transfers = transfer;
 183     GCBCHAINDOCB(newtransfercb, transfer);
 184 }
 185
 186 void resettransfer(struct transfer *transfer)
 187 {
 188     if(transfer->dir == TRNSD_DOWN)
 189     {
 190         if(transfer->iface != NULL)
 191             transferdetach(transfer);
 192         killfilter(transfer);
 193         transfersetstate(transfer, TRNS_WAITING);
 194         transfersetactivity(transfer, L"reset");
 195         return;
 196     }
 197 }
 198
 199 struct transfer *findtransfer(int id)
 200 {
 201     struct transfer *transfer;
 202
 203     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 204     {
 205         if(transfer->id == id)
 206             break;
 207     }
 208     return(transfer);
 209 }
 210
 211 static void transexpire(int cancelled, struct transfer *transfer)
 212 {
 213     transfer->etimer = NULL;
 214     if(!cancelled)
 215         bumptransfer(transfer);
 216     else
 217         transfer->timeout = 0;
 218 }
 219
 220 static void transferread(struct socket *sk, struct transfer *transfer)
 221 {
 222     if(sockgetdatalen(sk) >= 65536)
 223         sk->ignread = 1;
 224     if((transfer->iface != NULL) && (transfer->iface->gotdata != NULL))
 225         transfer->iface->gotdata(transfer, transfer->ifacedata);
 226 }
 227
 228 static void transferwrite(struct socket *sk, struct transfer *transfer)
 229 {
 230     if((transfer->iface != NULL) && (transfer->iface->wantdata != NULL))
 231         transfer->iface->wantdata(transfer, transfer->ifacedata);
 232 }
 233
 234 static void transfererr(struct socket *sk, int errno, struct transfer *transfer)
 235 {
 236     if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 237         transfer->iface->endofdata(transfer, transfer->ifacedata);
 238 }
 239
 240 void transferputdata(struct transfer *transfer, void *buf, size_t size)
 241 {
 242     time(&transfer->activity);
 243     sockqueue(transfer->localend, buf, size);
 244     transfer->curpos += size;
 245     bytesdownload += size;
 246     CBCHAINDOCB(transfer, trans_p, transfer);
 247 }
 248
 249 void transferendofdata(struct transfer *transfer)
 250 {
 251     if(transfer->curpos >= transfer->size)
 252     {
 253         transfersetstate(transfer, TRNS_DONE);
 254         transfer->localend->readcb = NULL;
 255         transfer->localend->writecb = NULL;
 256         transfer->localend->errcb = NULL;
 257         putsock(transfer->localend);
 258         transfer->localend = NULL;
 259     } else {
 260         resettransfer(transfer);
 261     }
 262 }
 263
 264 size_t transferdatasize(struct transfer *transfer)
 265 {
 266     return(sockqueuesize(transfer->localend));
 267 }
 268
 269 void *transfergetdata(struct transfer *transfer, size_t *size)
 270 {
 271     void *buf;
 272
 273     if(transfer->localend == NULL)
 274         return(NULL);
 275     transfer->localend->ignread = 0;
 276     time(&transfer->activity);
 277     if((buf = sockgetinbuf(transfer->localend, size)) == NULL)
 278         return(NULL);
 279     if((transfer->endpos >= 0) && (transfer->curpos + *size >= transfer->endpos))
 280     {
 281         *size = transfer->endpos - transfer->curpos;
 282         buf = srealloc(buf, *size);
 283     }
 284     transfer->curpos += *size;
 285     bytesupload += *size;
 286     CBCHAINDOCB(transfer, trans_p, transfer);
 287     return(buf);
 288 }
 289
 290 void transferprepul(struct transfer *transfer, size_t size, size_t start, size_t end, struct socket *lesk)
 291 {
 292     transfersetsize(transfer, size);
 293     transfer->curpos = start;
 294     transfer->endpos = end;
 295     lesk->ignread = 1;
 296     transfersetlocalend(transfer, lesk);
 297 }
 298
 299 void transferstartdl(struct transfer *transfer, struct socket *sk)
 300 {
 301     transfersetstate(transfer, TRNS_MAIN);
 302     socksettos(sk, confgetint("transfer", "dltos"));
 303 }
 304
 305 void transferstartul(struct transfer *transfer, struct socket *sk)
 306 {
 307     transfersetstate(transfer, TRNS_MAIN);
 308     socksettos(sk, confgetint("transfer", "ultos"));
 309     if(transfer->localend != NULL)
 310         transfer->localend->ignread = 0;
 311 }
 312
 313 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 314 {
 315     if(transfer->localend != NULL)
 316         putsock(transfer->localend);
 317     getsock(transfer->localend = sk);
 318     sk->data = transfer;
 319     sk->readcb = (void (*)(struct socket *, void *))transferread;
 320     sk->writecb = (void (*)(struct socket *, void *))transferwrite;
 321     sk->errcb = (void (*)(struct socket *, int, void *))transfererr;
 322 }
 323
 324 static int tryreq(struct transfer *transfer)
 325 {
 326     struct fnetnode *fn;
 327     struct fnetpeer *peer;
 328
 329     if((fn = transfer->fn) != NULL)
 330     {
 331         if(fn->state != FNN_EST)
 332         {
 333             transfer->close = 1;
 334             return(1);
 335         }
 336         peer = fnetfindpeer(fn, transfer->peerid);
 337     } else {
 338         peer = NULL;
 339         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 340         {
 341             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 342                 break;
 343         }
 344     }
 345     if(peer != NULL)
 346     {
 347         time(&transfer->lastreq);
 348         return(fn->fnet->reqconn(peer));
 349     }
 350     return(1);
 351 }
 352
 353 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 354 {
 355     struct transfer *transfer;
 356
 357     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 358     {
 359         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 360         {
 361             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 362             {
 363                 if(!tryreq(transfer))
 364                     return;
 365             }
 366         }
 367     }
 368 }
 369
 370 void bumptransfer(struct transfer *transfer)
 371 {
 372     time_t now;
 373
 374     if((now = time(NULL)) < transfer->timeout)
 375     {
 376
 377         if(transfer->etimer == NULL)
 378             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 379         return;
 380     }
 381     if(transfer->etimer != NULL)
 382         canceltimer(transfer->etimer);
 383     switch(transfer->state)
 384     {
 385     case TRNS_WAITING:
 386         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 387         if(now - transfer->lastreq > 30)
 388             tryreq(transfer);
 389         break;
 390     case TRNS_HS:
 391         if(transfer->dir == TRNSD_UP)
 392         {
 393             if(now - transfer->activity < 60)
 394                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 395             else
 396                 transfer->close = 1;
 397         } else if(transfer->dir == TRNSD_DOWN) {
 398             if(now - transfer->activity < 60)
 399                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 400             else
 401                 resettransfer(transfer);
 402         }
 403         break;
 404     case TRNS_MAIN:
 405         if(transfer->dir == TRNSD_UP)
 406         {
 407             if(now - transfer->activity < 300)
 408                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 409             else
 410                 transfer->close = 1;
 411         }
 412         break;
 413     }
 414 }
 415
 416 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 417 {
 418     time(&transfer->activity);
 419     if(desc != NULL)
 420     {
 421         if(transfer->actdesc != NULL)
 422             free(transfer->actdesc);
 423         transfer->actdesc = swcsdup(desc);
 424     }
 425     bumptransfer(transfer);
 426     CBCHAINDOCB(transfer, trans_act, transfer);
 427 }
 428
 429 void transfersetstate(struct transfer *transfer, int newstate)
 430 {
 431     transfer->state = newstate;
 432     if(transfer->etimer != NULL)
 433         canceltimer(transfer->etimer);
 434     transfersetactivity(transfer, NULL);
 435     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 436 }
 437
 438 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 439 {
 440     if(transfer->peernick != NULL)
 441         free(transfer->peernick);
 442     transfer->peernick = swcsdup(newnick);
 443     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 444 }
 445
 446 void transfersetsize(struct transfer *transfer, int newsize)
 447 {
 448     transfer->size = newsize;
 449     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 450 }
 451
 452 void transferseterror(struct transfer *transfer, int error)
 453 {
 454     transfer->error = error;
 455     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 456 }
 457
 458 void transfersetpath(struct transfer *transfer, wchar_t *path)
 459 {
 460     if(transfer->path != NULL)
 461         free(transfer->path);
 462     transfer->path = swcsdup(path);
 463     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 464 }
 465
 466 void transfersethash(struct transfer *transfer, struct hash *hash)
 467 {
 468     if(transfer->hash != NULL)
 469         freehash(transfer->hash);
 470     transfer->hash = hash;
 471     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 472 }
 473
 474 int slotsleft(void)
 475 {
 476     struct transfer *transfer;
 477     int slots;
 478
 479     slots = confgetint("transfer", "slots");
 480     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 481     {
 482         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 483             slots--;
 484     }
 485     return(slots);
 486 }
 487
 488 static void killfilter(struct transfer *transfer)
 489 {
 490     if(transfer->filter != -1)
 491     {
 492         kill(-transfer->filter, SIGHUP);
 493         transfer->filter = -1;
 494     }
 495     if(transfer->localend)
 496     {
 497         transfer->localend->readcb = NULL;
 498         transfer->localend->writecb = NULL;
 499         transfer->localend->errcb = NULL;
 500         putsock(transfer->localend);
 501         transfer->localend = NULL;
 502     }
 503     if(transfer->filterout)
 504     {
 505         transfer->filterout->readcb = NULL;
 506         putsock(transfer->filterout);
 507         transfer->filterout = NULL;
 508     }
 509     if(transfer->filterbuf)
 510     {
 511         free(transfer->filterbuf);
 512         transfer->filterbuf = NULL;
 513     }
 514     transfer->filterbufsize = transfer->filterbufdata = 0;
 515 }
 516
 517 static char *findfilter(struct passwd *pwd)
 518 {
 519     char *path, *filtername;
 520
 521     if((path = sprintf2("%s/.dcdl-filter", pwd->pw_dir)) != NULL)
 522     {
 523         if(!access(path, X_OK))
 524             return(path);
 525         free(path);
 526     }
 527     if((filtername = icwcstombs(confgetstr("transfer", "filter"), NULL)) == NULL)
 528     {
 529         flog(LOG_WARNING, "could not convert filter name into local charset: %s", strerror(errno));
 530     } else {
 531         if(strchr(filtername, '/') == NULL)
 532         {
 533             if((path = sprintf2("/etc/%s", filtername)) != NULL)
 534             {
 535                 if(!access(path, X_OK))
 536                 {
 537                     free(filtername);
 538                     return(path);
 539                 }
 540                 free(path);
 541             }
 542             if((path = sprintf2("/usr/etc/%s", filtername)) != NULL)
 543             {
 544                 if(!access(path, X_OK))
 545                 {
 546                     free(filtername);
 547                     return(path);
 548                 }
 549                 free(path);
 550             }
 551             if((path = sprintf2("/usr/local/etc/%s", filtername)) != NULL)
 552             {
 553                 if(!access(path, X_OK))
 554                 {
 555                     free(filtername);
 556                     return(path);
 557                 }
 558                 free(path);
 559             }
 560         } else {
 561             if(!access(filtername, X_OK))
 562                 return(filtername);
 563         }
 564         free(filtername);
 565     }
 566     return(NULL);
 567 }
 568
 569 static void filterread(struct socket *sk, struct transfer *transfer)
 570 {
 571     char *buf, *p, *p2;
 572     size_t bufsize;
 573     wchar_t *cmd, *arg;
 574
 575     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 576         return;
 577     bufcat(transfer->filterbuf, buf, bufsize);
 578     free(buf);
 579     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 580     {
 581         *(p++) = 0;
 582         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 583             *(p2++) = 0;
 584         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 585         {
 586             arg = NULL;
 587             if(p2 != NULL)
 588             {
 589                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 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             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 593             if(arg != NULL)
 594                 free(arg);
 595             free(cmd);
 596         } else {
 597             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 598         }
 599         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 600     }
 601 }
 602
 603 static void filterexit(pid_t pid, int status, void *data)
 604 {
 605     struct transfer *transfer;
 606
 607     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 608     {
 609         if(transfer->filter == pid)
 610         {
 611             transfer->filter = -1;
 612             killfilter(transfer);
 613             if(WEXITSTATUS(status))
 614             {
 615                 resettransfer(transfer);
 616             } else {
 617                 freetransfer(transfer);
 618             }
 619             trytransferbypeer(transfer->fnet, transfer->peerid);
 620             break;
 621         }
 622     }
 623 }
 624
 625 int forkfilter(struct transfer *transfer)
 626 {
 627     char *filtername, *filename, *peerid, *buf;
 628     wchar_t *wfilename;
 629     struct passwd *pwent;
 630     pid_t pid;
 631     int inpipe, outpipe;
 632     char **argv;
 633     size_t argvsize, argvdata;
 634     struct socket *insock, *outsock;
 635     struct wcspair *ta;
 636     char *rec, *val;
 637
 638     wfilename = transfer->path;
 639     if(transfer->fnet->filebasename != NULL)
 640         wfilename = transfer->fnet->filebasename(wfilename);
 641     if(transfer->auth == NULL)
 642     {
 643         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 644         errno = EACCES;
 645         return(-1);
 646     }
 647     if((pwent = getpwuid(transfer->owner)) == NULL)
 648     {
 649         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 650         errno = EACCES;
 651         return(-1);
 652     }
 653     if((filtername = findfilter(pwent)) == NULL)
 654     {
 655         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 656         errno = ENOENT;
 657         return(-1);
 658     }
 659     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 660     {
 661         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 662         {
 663             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 664             return(-1);
 665         }
 666         filename = sprintf2("utf8-%s", buf);
 667         free(buf);
 668     }
 669     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 670     {
 671         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 672         {
 673             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 674             free(filename);
 675             return(-1);
 676         }
 677         peerid = sprintf2("utf8-%s", buf);
 678         free(buf);
 679     }
 680     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)
 681     {
 682         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 683         return(-1);
 684     }
 685     if(pid == 0)
 686     {
 687         argv = NULL;
 688         argvsize = argvdata = 0;
 689         buf = sprintf2("%i", transfer->size);
 690         addtobuf(argv, filtername);
 691         addtobuf(argv, filename);
 692         addtobuf(argv, buf);
 693         addtobuf(argv, peerid);
 694         if(transfer->hash)
 695         {
 696             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 697             {
 698                 /* XXX: I am very doubtful of this, but it can just as
 699                  * well be argued that all data should be presented as
 700                  * key-value pairs. */
 701                 addtobuf(argv, "hash");
 702                 addtobuf(argv, buf);
 703             } else {
 704                 flog(LOG_WARNING, "could not convert hash to local charset");
 705             }
 706         }
 707         for(ta = transfer->args; ta != NULL; ta = ta->next)
 708         {
 709             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 710                 continue;
 711             if((val = icwcstombs(ta->val, NULL)) == NULL)
 712                 continue;
 713             addtobuf(argv, rec);
 714             addtobuf(argv, val);
 715         }
 716         addtobuf(argv, NULL);
 717         execv(filtername, argv);
 718         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 719         exit(127);
 720     }
 721     insock = wrapsock(inpipe);
 722     outsock = wrapsock(outpipe);
 723     /* Really, really strange thing here - sometimes the kernel would
 724      * return POLLIN on insock, even though it's a write-side
 725      * pipe. The corresponding read on the pipe naturally returns
 726      * EBADF, causing doldacond to think there's something wrong with
 727      * the fd, and thus it closes it. Until I can find out whyever the
 728      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 729      * set ignread on insock for now. */
 730     insock->ignread = 1;
 731     transfer->filter = pid;
 732     transfersetlocalend(transfer, insock);
 733     getsock(transfer->filterout = outsock);
 734     outsock->data = transfer;
 735     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 736     putsock(insock);
 737     putsock(outsock);
 738     free(filtername);
 739     free(filename);
 740     free(peerid);
 741     return(0);
 742 }
 743
 744 static int run(void)
 745 {
 746     struct transfer *transfer, *next;
 747
 748     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 749     {
 750         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 751         {
 752             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 753                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 754             closesock(transfer->localend);
 755         }
 756     }
 757     for(transfer = transfers; transfer != NULL; transfer = next)
 758     {
 759         next = transfer->next;
 760         if(transfer->close)
 761         {
 762             transferdetach(transfer);
 763             freetransfer(transfer);
 764             continue;
 765         }
 766     }
 767     return(0);
 768 }
 769
 770 static struct configvar myvars[] =
 771 {
 772     {CONF_VAR_INT, "slots", {.num = 3}},
 773     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 774     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 775     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 776     {CONF_VAR_END}
 777 };
 778
 779 static struct module me =
 780 {
 781     .conf =
 782     {
 783         .vars = myvars
 784     },
 785     .name = "transfer",
 786     .run = run
 787 };
 788
 789 MODULE(me);