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 void transferattach(struct transfer *transfer, struct socket *dpipe)
 130 {
 131     transferdetach(transfer);
 132     getsock(transfer->datapipe = dpipe);
 133 }
 134
 135 void transferdetach(struct transfer *transfer)
 136 {
 137     if(transfer->datapipe != NULL) {
 138         closesock(transfer->datapipe);
 139         putsock(transfer->datapipe);
 140     }
 141     transfer->datapipe = NULL;
 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->datapipe == NULL) && !wcscmp(peerid, transfer->peerid))
 151             break;
 152     }
 153     return(transfer);
 154 }
 155
 156 struct transfer *hasupload(struct fnet *fnet, wchar_t *peerid)
 157 {
 158     struct transfer *transfer;
 159
 160     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 161     {
 162         if((transfer->dir == TRNSD_UP) && (transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 163             break;
 164     }
 165     return(transfer);
 166 }
 167
 168 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct socket *dpipe)
 169 {
 170     struct transfer *transfer;
 171
 172     transfer = newtransfer();
 173     if(fnet != NULL)
 174         transfer->fnet = fnet;
 175     else
 176         transfer->fnet = fn->fnet;
 177     transfer->peerid = swcsdup(nickid);
 178     transfer->state = TRNS_HS;
 179     transfer->dir = TRNSD_UP;
 180     if(fn != NULL)
 181         getfnetnode(transfer->fn = fn);
 182     transferattach(transfer, dpipe);
 183     linktransfer(transfer);
 184     bumptransfer(transfer);
 185     return(transfer);
 186 }
 187
 188 void linktransfer(struct transfer *transfer)
 189 {
 190     transfer->next = transfers;
 191     transfer->prev = NULL;
 192     if(transfers != NULL)
 193         transfers->prev = transfer;
 194     transfers = transfer;
 195     GCBCHAINDOCB(newtransfercb, transfer);
 196 }
 197
 198 void resettransfer(struct transfer *transfer)
 199 {
 200     if(transfer->dir == TRNSD_DOWN)
 201     {
 202         transferdetach(transfer);
 203         killfilter(transfer);
 204         transfersetstate(transfer, TRNS_WAITING);
 205         transfersetactivity(transfer, L"reset");
 206         return;
 207     }
 208 }
 209
 210 struct transfer *findtransfer(int id)
 211 {
 212     struct transfer *transfer;
 213
 214     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 215     {
 216         if(transfer->id == id)
 217             break;
 218     }
 219     return(transfer);
 220 }
 221
 222 static void transexpire(int cancelled, struct transfer *transfer)
 223 {
 224     transfer->etimer = NULL;
 225     if(!cancelled)
 226         bumptransfer(transfer);
 227     else
 228         transfer->timeout = 0;
 229 }
 230
 231 static void localread(struct socket *sk, struct transfer *transfer)
 232 {
 233     void *buf;
 234     size_t blen;
 235
 236     if(transfer->datapipe != NULL) {
 237         buf = sockgetinbuf(sk, &blen);
 238         sockqueue(transfer->datapipe, buf, blen);
 239         if(sockqueuesize(transfer->datapipe) >= 65536)
 240             sockblock(sk, 1);
 241         else
 242             sockblock(sk, 0);
 243     } else {
 244         if(sockgetdatalen(sk) >= 65536)
 245             sockblock(sk, 1);
 246     }
 247 }
 248
 249 static void localwrite(struct socket *sk, struct transfer *transfer)
 250 {
 251     void *buf;
 252     size_t blen;
 253
 254
 255 }
 256
 257 static void localerr(struct socket *sk, int errno, struct transfer *transfer)
 258 {
 259     if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 260         transfer->iface->endofdata(transfer, transfer->ifacedata);
 261 }
 262
 263 void transferputdata(struct transfer *transfer, void *buf, size_t size)
 264 {
 265     time(&transfer->activity);
 266     sockqueue(transfer->localend, buf, size);
 267     transfer->curpos += size;
 268     bytesdownload += size;
 269     CBCHAINDOCB(transfer, trans_p, transfer);
 270 }
 271
 272 void transferendofdata(struct transfer *transfer)
 273 {
 274     if(transfer->curpos >= transfer->size)
 275     {
 276         transfersetstate(transfer, TRNS_DONE);
 277         transfer->localend->readcb = NULL;
 278         transfer->localend->writecb = NULL;
 279         transfer->localend->errcb = NULL;
 280         putsock(transfer->localend);
 281         transfer->localend = NULL;
 282     } else {
 283         resettransfer(transfer);
 284     }
 285 }
 286
 287 size_t transferdatasize(struct transfer *transfer)
 288 {
 289     return(sockqueuesize(transfer->localend));
 290 }
 291
 292 void *transfergetdata(struct transfer *transfer, size_t *size)
 293 {
 294     void *buf;
 295
 296     if(transfer->localend == NULL)
 297         return(NULL);
 298     sockblock(transfer->localend, 0);
 299     time(&transfer->activity);
 300     if((buf = sockgetinbuf(transfer->localend, size)) == NULL)
 301         return(NULL);
 302     if((transfer->endpos >= 0) && (transfer->curpos + *size >= transfer->endpos))
 303     {
 304         if((*size = transfer->endpos - transfer->curpos) == 0) {
 305             free(buf);
 306             buf = NULL;
 307         } else {
 308             buf = srealloc(buf, *size);
 309         }
 310     }
 311     transfer->curpos += *size;
 312     bytesupload += *size;
 313     CBCHAINDOCB(transfer, trans_p, transfer);
 314     return(buf);
 315 }
 316
 317 void transferprepul(struct transfer *transfer, off_t size, off_t start, off_t end, struct socket *lesk)
 318 {
 319     transfersetsize(transfer, size);
 320     transfer->curpos = start;
 321     transfer->endpos = end;
 322     sockblock(lesk, 1);
 323     transfersetlocalend(transfer, lesk);
 324 }
 325
 326 void transferstartdl(struct transfer *transfer, struct socket *sk)
 327 {
 328     transfersetstate(transfer, TRNS_MAIN);
 329     socksettos(sk, confgetint("transfer", "dltos"));
 330 }
 331
 332 void transferstartul(struct transfer *transfer, struct socket *sk)
 333 {
 334     transfersetstate(transfer, TRNS_MAIN);
 335     socksettos(sk, confgetint("transfer", "ultos"));
 336     if(transfer->localend != NULL)
 337         sockblock(transfer->localend, 0);
 338 }
 339
 340 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 341 {
 342     if(transfer->localend != NULL)
 343         putsock(transfer->localend);
 344     getsock(transfer->localend = sk);
 345     sk->data = transfer;
 346     sk->readcb = (void (*)(struct socket *, void *))localread;
 347     sk->writecb = (void (*)(struct socket *, void *))localwrite;
 348     sk->errcb = (void (*)(struct socket *, int, void *))localerr;
 349 }
 350
 351 static int tryreq(struct transfer *transfer)
 352 {
 353     struct fnetnode *fn;
 354     struct fnetpeer *peer;
 355
 356     if((fn = transfer->fn) != NULL)
 357     {
 358         if(fn->state != FNN_EST)
 359         {
 360             transfer->close = 1;
 361             return(1);
 362         }
 363         peer = fnetfindpeer(fn, transfer->peerid);
 364     } else {
 365         peer = NULL;
 366         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 367         {
 368             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 369                 break;
 370         }
 371     }
 372     if(peer != NULL)
 373     {
 374         time(&transfer->lastreq);
 375         return(fn->fnet->reqconn(peer));
 376     }
 377     return(1);
 378 }
 379
 380 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 381 {
 382     struct transfer *transfer;
 383
 384     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 385     {
 386         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 387         {
 388             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 389             {
 390                 if(!tryreq(transfer))
 391                     return;
 392             }
 393         }
 394     }
 395 }
 396
 397 void bumptransfer(struct transfer *transfer)
 398 {
 399     time_t now;
 400
 401     if((now = time(NULL)) < transfer->timeout)
 402     {
 403
 404         if(transfer->etimer == NULL)
 405             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 406         return;
 407     }
 408     if(transfer->etimer != NULL)
 409         canceltimer(transfer->etimer);
 410     switch(transfer->state)
 411     {
 412     case TRNS_WAITING:
 413         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 414         if(now - transfer->lastreq > 30)
 415             tryreq(transfer);
 416         break;
 417     case TRNS_HS:
 418         if(transfer->dir == TRNSD_UP)
 419         {
 420             if(now - transfer->activity < 60)
 421                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 422             else
 423                 transfer->close = 1;
 424         } else if(transfer->dir == TRNSD_DOWN) {
 425             if(now - transfer->activity < 60)
 426                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 427             else
 428                 resettransfer(transfer);
 429         }
 430         break;
 431     case TRNS_MAIN:
 432         if(transfer->dir == TRNSD_UP)
 433         {
 434             if(now - transfer->activity < 300)
 435                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 436             else
 437                 transfer->close = 1;
 438         }
 439         break;
 440     }
 441 }
 442
 443 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 444 {
 445     time(&transfer->activity);
 446     if(desc != NULL)
 447     {
 448         if(transfer->actdesc != NULL)
 449             free(transfer->actdesc);
 450         transfer->actdesc = swcsdup(desc);
 451     }
 452     bumptransfer(transfer);
 453     CBCHAINDOCB(transfer, trans_act, transfer);
 454 }
 455
 456 void transfersetstate(struct transfer *transfer, int newstate)
 457 {
 458     transfer->state = newstate;
 459     if(transfer->etimer != NULL)
 460         canceltimer(transfer->etimer);
 461     transfersetactivity(transfer, NULL);
 462     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 463 }
 464
 465 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 466 {
 467     if(transfer->peernick != NULL)
 468         free(transfer->peernick);
 469     transfer->peernick = swcsdup(newnick);
 470     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 471 }
 472
 473 void transfersetsize(struct transfer *transfer, off_t newsize)
 474 {
 475     transfer->size = newsize;
 476     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 477 }
 478
 479 void transferseterror(struct transfer *transfer, int error)
 480 {
 481     transfer->error = error;
 482     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 483 }
 484
 485 void transfersetpath(struct transfer *transfer, wchar_t *path)
 486 {
 487     if(transfer->path != NULL)
 488         free(transfer->path);
 489     transfer->path = swcsdup(path);
 490     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 491 }
 492
 493 void transfersethash(struct transfer *transfer, struct hash *hash)
 494 {
 495     if(transfer->hash != NULL)
 496         freehash(transfer->hash);
 497     transfer->hash = hash;
 498     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 499 }
 500
 501 int slotsleft(void)
 502 {
 503     struct transfer *transfer;
 504     int slots;
 505
 506     slots = confgetint("transfer", "slots");
 507     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 508     {
 509         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 510             slots--;
 511     }
 512     return(slots);
 513 }
 514
 515 static void killfilter(struct transfer *transfer)
 516 {
 517     if(transfer->filter != -1)
 518     {
 519         kill(-transfer->filter, SIGHUP);
 520         transfer->filter = -1;
 521     }
 522     if(transfer->localend)
 523     {
 524         transfer->localend->readcb = NULL;
 525         transfer->localend->writecb = NULL;
 526         transfer->localend->errcb = NULL;
 527         putsock(transfer->localend);
 528         transfer->localend = NULL;
 529     }
 530     if(transfer->filterout)
 531     {
 532         transfer->filterout->readcb = NULL;
 533         putsock(transfer->filterout);
 534         transfer->filterout = NULL;
 535     }
 536     if(transfer->filterbuf)
 537     {
 538         free(transfer->filterbuf);
 539         transfer->filterbuf = NULL;
 540     }
 541     transfer->filterbufsize = transfer->filterbufdata = 0;
 542 }
 543
 544 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
 545 {
 546     if(!wcscmp(cmd, L"status")) {
 547         if(arg == NULL)
 548             arg = L"";
 549         if(transfer->exitstatus != NULL)
 550             free(transfer->exitstatus);
 551         transfer->exitstatus = swcsdup(arg);
 552     }
 553 }
 554
 555 static void filterread(struct socket *sk, struct transfer *transfer)
 556 {
 557     char *buf, *p, *p2;
 558     size_t bufsize;
 559     wchar_t *cmd, *arg;
 560
 561     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 562         return;
 563     bufcat(transfer->filterbuf, buf, bufsize);
 564     free(buf);
 565     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 566     {
 567         *(p++) = 0;
 568         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 569             *(p2++) = 0;
 570         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 571         {
 572             arg = NULL;
 573             if(p2 != NULL)
 574             {
 575                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 576                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
 577             }
 578             handletranscmd(transfer, cmd, arg);
 579             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 580             if(arg != NULL)
 581                 free(arg);
 582             free(cmd);
 583         } else {
 584             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 585         }
 586         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 587     }
 588 }
 589
 590 static void filterexit(pid_t pid, int status, void *data)
 591 {
 592     struct transfer *transfer;
 593     struct fnet *fnet;
 594     wchar_t *peerid;
 595
 596     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 597     {
 598         if(transfer->filter == pid)
 599         {
 600             transfer->filter = -1;
 601             killfilter(transfer);
 602             fnet = transfer->fnet;
 603             peerid = swcsdup(transfer->peerid);
 604             if(WEXITSTATUS(status))
 605                 resettransfer(transfer);
 606             else
 607                 freetransfer(transfer);
 608             trytransferbypeer(fnet, peerid);
 609             free(peerid);
 610             break;
 611         }
 612     }
 613 }
 614
 615 int forkfilter(struct transfer *transfer)
 616 {
 617     char *filtername, *filename, *peerid, *buf, *p;
 618     wchar_t *wfilename;
 619     struct passwd *pwent;
 620     pid_t pid;
 621     int inpipe, outpipe;
 622     char **argv;
 623     size_t argvsize, argvdata;
 624     struct socket *insock, *outsock;
 625     struct wcspair *ta;
 626     char *rec, *val;
 627
 628     wfilename = fnfilebasename(transfer->path);
 629     if(transfer->auth == NULL)
 630     {
 631         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 632         errno = EACCES;
 633         return(-1);
 634     }
 635     if((pwent = getpwuid(transfer->owner)) == NULL)
 636     {
 637         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 638         errno = EACCES;
 639         return(-1);
 640     }
 641     filtername = findfile("dc-filter", pwent->pw_dir, 0);
 642     if(filtername == NULL)
 643         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
 644     if(filtername == NULL)
 645     {
 646         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 647         errno = ENOENT;
 648         return(-1);
 649     }
 650     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 651     {
 652         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 653         {
 654             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 655             return(-1);
 656         }
 657         filename = sprintf2("utf8-%s", buf);
 658         free(buf);
 659     }
 660     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 661     {
 662         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 663         {
 664             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 665             free(filename);
 666             return(-1);
 667         }
 668         peerid = sprintf2("utf8-%s", buf);
 669         free(buf);
 670     }
 671     for(p = filename; *p; p++) {
 672         if(*p == '/')
 673             *p = '_';
 674         else if((p == filename) && (*p == '.'))
 675             *p = '_';
 676     }
 677     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)
 678     {
 679         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 680         return(-1);
 681     }
 682     if(pid == 0)
 683     {
 684         argv = NULL;
 685         argvsize = argvdata = 0;
 686         buf = sprintf2("%ji", (intmax_t)transfer->size);
 687         addtobuf(argv, filtername);
 688         addtobuf(argv, filename);
 689         addtobuf(argv, buf);
 690         addtobuf(argv, peerid);
 691         if(transfer->hash)
 692         {
 693             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 694             {
 695                 /* XXX: I am very doubtful of this, but it can just as
 696                  * well be argued that all data should be presented as
 697                  * key-value pairs. */
 698                 addtobuf(argv, "hash");
 699                 addtobuf(argv, buf);
 700             } else {
 701                 flog(LOG_WARNING, "could not convert hash to local charset");
 702             }
 703         }
 704         for(ta = transfer->args; ta != NULL; ta = ta->next)
 705         {
 706             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 707                 continue;
 708             if((val = icwcstombs(ta->val, NULL)) == NULL)
 709                 continue;
 710             addtobuf(argv, rec);
 711             addtobuf(argv, val);
 712         }
 713         addtobuf(argv, NULL);
 714         execv(filtername, argv);
 715         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 716         exit(127);
 717     }
 718     insock = wrapsock(inpipe);
 719     outsock = wrapsock(outpipe);
 720     /* Really, really strange thing here - sometimes the kernel would
 721      * return POLLIN on insock, even though it's a write-side
 722      * pipe. The corresponding read on the pipe naturally returns
 723      * EBADF, causing doldacond to think there's something wrong with
 724      * the fd, and thus it closes it. Until I can find out whyever the
 725      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 726      * set ignread on insock for now. */
 727     sockblock(insock, 1);
 728     transfer->filter = pid;
 729     transfersetlocalend(transfer, insock);
 730     getsock(transfer->filterout = outsock);
 731     outsock->data = transfer;
 732     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 733     putsock(insock);
 734     putsock(outsock);
 735     free(filtername);
 736     free(filename);
 737     free(peerid);
 738     return(0);
 739 }
 740
 741 static int run(void)
 742 {
 743     struct transfer *transfer, *next;
 744
 745     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 746     {
 747         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 748         {
 749             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 750                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 751             closesock(transfer->localend);
 752         }
 753     }
 754     for(transfer = transfers; transfer != NULL; transfer = next)
 755     {
 756         next = transfer->next;
 757         if(transfer->close)
 758         {
 759             transferdetach(transfer);
 760             freetransfer(transfer);
 761             continue;
 762         }
 763     }
 764     return(0);
 765 }
 766
 767 static struct configvar myvars[] =
 768 {
 769     /** The maximum number of simultaneously permitted uploads. A
 770      * common hub rule is that you will need at least as many slots as
 771      * the number of hubs to which you are connected. */
 772     {CONF_VAR_INT, "slots", {.num = 3}},
 773     /** The TOS value to use for upload connections (see the TOS
 774      * VALUES section). */
 775     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 776     /** The TOS value to use for download connections (see the TOS
 777      * VALUES section). */
 778     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 779     /** The name of the filter script (see the FILES section for
 780      * lookup information). */
 781     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 782     /** If true, only one upload is allowed per remote peer. This
 783      * option is still experimental, so it is recommended to leave it
 784      * off. */
 785     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
 786     {CONF_VAR_END}
 787 };
 788
 789 static struct module me =
 790 {
 791     .conf =
 792     {
 793         .vars = myvars
 794     },
 795     .name = "transfer",
 796     .run = run
 797 };
 798
 799 MODULE(me);