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 transferiface *iface, void *data)
 130 {
 131     if(transfer->iface != NULL)
 132         transferdetach(transfer);
 133     transfer->iface = iface;
 134     transfer->ifacedata = data;
 135 }
 136
 137 void transferdetach(struct transfer *transfer)
 138 {
 139     if(transfer->iface != NULL)
 140     {
 141         transfer->iface->detach(transfer, transfer->ifacedata);
 142         transfer->iface = NULL;
 143         transfer->ifacedata = NULL;
 144     }
 145 }
 146
 147 struct transfer *finddownload(wchar_t *peerid)
 148 {
 149     struct transfer *transfer;
 150
 151     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 152     {
 153         if((transfer->dir == TRNSD_DOWN) && (transfer->iface == NULL) && !wcscmp(peerid, transfer->peerid))
 154             break;
 155     }
 156     return(transfer);
 157 }
 158
 159 struct transfer *hasupload(struct fnet *fnet, wchar_t *peerid)
 160 {
 161     struct transfer *transfer;
 162
 163     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 164     {
 165         if((transfer->dir == TRNSD_UP) && (transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 166             break;
 167     }
 168     return(transfer);
 169 }
 170
 171 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct transferiface *iface, void *data)
 172 {
 173     struct transfer *transfer;
 174
 175     transfer = newtransfer();
 176     if(fnet != NULL)
 177         transfer->fnet = fnet;
 178     else
 179         transfer->fnet = fn->fnet;
 180     transfer->peerid = swcsdup(nickid);
 181     transfer->state = TRNS_HS;
 182     transfer->dir = TRNSD_UP;
 183     if(fn != NULL)
 184         getfnetnode(transfer->fn = fn);
 185     transferattach(transfer, iface, data);
 186     linktransfer(transfer);
 187     bumptransfer(transfer);
 188     return(transfer);
 189 }
 190
 191 void linktransfer(struct transfer *transfer)
 192 {
 193     transfer->next = transfers;
 194     transfer->prev = NULL;
 195     if(transfers != NULL)
 196         transfers->prev = transfer;
 197     transfers = transfer;
 198     GCBCHAINDOCB(newtransfercb, transfer);
 199 }
 200
 201 void resettransfer(struct transfer *transfer)
 202 {
 203     if(transfer->dir == TRNSD_DOWN)
 204     {
 205         if(transfer->iface != NULL)
 206             transferdetach(transfer);
 207         killfilter(transfer);
 208         transfersetstate(transfer, TRNS_WAITING);
 209         transfersetactivity(transfer, L"reset");
 210         return;
 211     }
 212 }
 213
 214 struct transfer *findtransfer(int id)
 215 {
 216     struct transfer *transfer;
 217
 218     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 219     {
 220         if(transfer->id == id)
 221             break;
 222     }
 223     return(transfer);
 224 }
 225
 226 static void transexpire(int cancelled, struct transfer *transfer)
 227 {
 228     transfer->etimer = NULL;
 229     if(!cancelled)
 230         bumptransfer(transfer);
 231     else
 232         transfer->timeout = 0;
 233 }
 234
 235 static void transferread(struct socket *sk, struct transfer *transfer)
 236 {
 237     if(sockgetdatalen(sk) >= 65536)
 238         sockblock(sk, 1);
 239     if((transfer->iface != NULL) && (transfer->iface->gotdata != NULL))
 240         transfer->iface->gotdata(transfer, transfer->ifacedata);
 241 }
 242
 243 static void transferwrite(struct socket *sk, struct transfer *transfer)
 244 {
 245     if((transfer->iface != NULL) && (transfer->iface->wantdata != NULL))
 246         transfer->iface->wantdata(transfer, transfer->ifacedata);
 247 }
 248
 249 static void transfererr(struct socket *sk, int errno, struct transfer *transfer)
 250 {
 251     if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 252         transfer->iface->endofdata(transfer, transfer->ifacedata);
 253 }
 254
 255 void transferputdata(struct transfer *transfer, void *buf, size_t size)
 256 {
 257     time(&transfer->activity);
 258     sockqueue(transfer->localend, buf, size);
 259     transfer->curpos += size;
 260     bytesdownload += size;
 261     CBCHAINDOCB(transfer, trans_p, transfer);
 262 }
 263
 264 void transferendofdata(struct transfer *transfer)
 265 {
 266     if(transfer->curpos >= transfer->size)
 267     {
 268         transfersetstate(transfer, TRNS_DONE);
 269         transfer->localend->readcb = NULL;
 270         transfer->localend->writecb = NULL;
 271         transfer->localend->errcb = NULL;
 272         putsock(transfer->localend);
 273         transfer->localend = NULL;
 274     } else {
 275         resettransfer(transfer);
 276     }
 277 }
 278
 279 size_t transferdatasize(struct transfer *transfer)
 280 {
 281     return(sockqueuesize(transfer->localend));
 282 }
 283
 284 void *transfergetdata(struct transfer *transfer, size_t *size)
 285 {
 286     void *buf;
 287
 288     if(transfer->localend == NULL)
 289         return(NULL);
 290     sockblock(transfer->localend, 0);
 291     time(&transfer->activity);
 292     if((buf = sockgetinbuf(transfer->localend, size)) == NULL)
 293         return(NULL);
 294     if((transfer->endpos >= 0) && (transfer->curpos + *size >= transfer->endpos))
 295     {
 296         if((*size = transfer->endpos - transfer->curpos) == 0) {
 297             free(buf);
 298             buf = NULL;
 299         } else {
 300             buf = srealloc(buf, *size);
 301         }
 302     }
 303     transfer->curpos += *size;
 304     bytesupload += *size;
 305     CBCHAINDOCB(transfer, trans_p, transfer);
 306     return(buf);
 307 }
 308
 309 void transferprepul(struct transfer *transfer, off_t size, off_t start, off_t end, struct socket *lesk)
 310 {
 311     transfersetsize(transfer, size);
 312     transfer->curpos = start;
 313     transfer->endpos = end;
 314     sockblock(lesk, 1);
 315     transfersetlocalend(transfer, lesk);
 316 }
 317
 318 void transferstartdl(struct transfer *transfer, struct socket *sk)
 319 {
 320     transfersetstate(transfer, TRNS_MAIN);
 321     socksettos(sk, confgetint("transfer", "dltos"));
 322 }
 323
 324 void transferstartul(struct transfer *transfer, struct socket *sk)
 325 {
 326     transfersetstate(transfer, TRNS_MAIN);
 327     socksettos(sk, confgetint("transfer", "ultos"));
 328     if(transfer->localend != NULL)
 329         sockblock(transfer->localend, 0);
 330 }
 331
 332 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 333 {
 334     if(transfer->localend != NULL)
 335         putsock(transfer->localend);
 336     getsock(transfer->localend = sk);
 337     sk->data = transfer;
 338     sk->readcb = (void (*)(struct socket *, void *))transferread;
 339     sk->writecb = (void (*)(struct socket *, void *))transferwrite;
 340     sk->errcb = (void (*)(struct socket *, int, void *))transfererr;
 341 }
 342
 343 static int tryreq(struct transfer *transfer)
 344 {
 345     struct fnetnode *fn;
 346     struct fnetpeer *peer;
 347
 348     if((fn = transfer->fn) != NULL)
 349     {
 350         if(fn->state != FNN_EST)
 351         {
 352             transfer->close = 1;
 353             return(1);
 354         }
 355         peer = fnetfindpeer(fn, transfer->peerid);
 356     } else {
 357         peer = NULL;
 358         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 359         {
 360             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 361                 break;
 362         }
 363     }
 364     if(peer != NULL)
 365     {
 366         time(&transfer->lastreq);
 367         return(fn->fnet->reqconn(peer));
 368     }
 369     return(1);
 370 }
 371
 372 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 373 {
 374     struct transfer *transfer;
 375
 376     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 377     {
 378         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 379         {
 380             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 381             {
 382                 if(!tryreq(transfer))
 383                     return;
 384             }
 385         }
 386     }
 387 }
 388
 389 void bumptransfer(struct transfer *transfer)
 390 {
 391     time_t now;
 392
 393     if((now = time(NULL)) < transfer->timeout)
 394     {
 395
 396         if(transfer->etimer == NULL)
 397             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 398         return;
 399     }
 400     if(transfer->etimer != NULL)
 401         canceltimer(transfer->etimer);
 402     switch(transfer->state)
 403     {
 404     case TRNS_WAITING:
 405         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 406         if(now - transfer->lastreq > 30)
 407             tryreq(transfer);
 408         break;
 409     case TRNS_HS:
 410         if(transfer->dir == TRNSD_UP)
 411         {
 412             if(now - transfer->activity < 60)
 413                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 414             else
 415                 transfer->close = 1;
 416         } else if(transfer->dir == TRNSD_DOWN) {
 417             if(now - transfer->activity < 60)
 418                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 419             else
 420                 resettransfer(transfer);
 421         }
 422         break;
 423     case TRNS_MAIN:
 424         if(transfer->dir == TRNSD_UP)
 425         {
 426             if(now - transfer->activity < 300)
 427                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 428             else
 429                 transfer->close = 1;
 430         }
 431         break;
 432     }
 433 }
 434
 435 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 436 {
 437     time(&transfer->activity);
 438     if(desc != NULL)
 439     {
 440         if(transfer->actdesc != NULL)
 441             free(transfer->actdesc);
 442         transfer->actdesc = swcsdup(desc);
 443     }
 444     bumptransfer(transfer);
 445     CBCHAINDOCB(transfer, trans_act, transfer);
 446 }
 447
 448 void transfersetstate(struct transfer *transfer, int newstate)
 449 {
 450     transfer->state = newstate;
 451     if(transfer->etimer != NULL)
 452         canceltimer(transfer->etimer);
 453     transfersetactivity(transfer, NULL);
 454     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 455 }
 456
 457 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 458 {
 459     if(transfer->peernick != NULL)
 460         free(transfer->peernick);
 461     transfer->peernick = swcsdup(newnick);
 462     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 463 }
 464
 465 void transfersetsize(struct transfer *transfer, off_t newsize)
 466 {
 467     transfer->size = newsize;
 468     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 469 }
 470
 471 void transferseterror(struct transfer *transfer, int error)
 472 {
 473     transfer->error = error;
 474     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 475 }
 476
 477 void transfersetpath(struct transfer *transfer, wchar_t *path)
 478 {
 479     if(transfer->path != NULL)
 480         free(transfer->path);
 481     transfer->path = swcsdup(path);
 482     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 483 }
 484
 485 void transfersethash(struct transfer *transfer, struct hash *hash)
 486 {
 487     if(transfer->hash != NULL)
 488         freehash(transfer->hash);
 489     transfer->hash = hash;
 490     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 491 }
 492
 493 int slotsleft(void)
 494 {
 495     struct transfer *transfer;
 496     int slots;
 497
 498     slots = confgetint("transfer", "slots");
 499     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 500     {
 501         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 502             slots--;
 503     }
 504     return(slots);
 505 }
 506
 507 static void killfilter(struct transfer *transfer)
 508 {
 509     if(transfer->filter != -1)
 510     {
 511         kill(-transfer->filter, SIGHUP);
 512         transfer->filter = -1;
 513     }
 514     if(transfer->localend)
 515     {
 516         transfer->localend->readcb = NULL;
 517         transfer->localend->writecb = NULL;
 518         transfer->localend->errcb = NULL;
 519         putsock(transfer->localend);
 520         transfer->localend = NULL;
 521     }
 522     if(transfer->filterout)
 523     {
 524         transfer->filterout->readcb = NULL;
 525         putsock(transfer->filterout);
 526         transfer->filterout = NULL;
 527     }
 528     if(transfer->filterbuf)
 529     {
 530         free(transfer->filterbuf);
 531         transfer->filterbuf = NULL;
 532     }
 533     transfer->filterbufsize = transfer->filterbufdata = 0;
 534 }
 535
 536 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
 537 {
 538     if(!wcscmp(cmd, L"status")) {
 539         if(arg == NULL)
 540             arg = L"";
 541         if(transfer->exitstatus != NULL)
 542             free(transfer->exitstatus);
 543         transfer->exitstatus = swcsdup(arg);
 544     }
 545 }
 546
 547 static void filterread(struct socket *sk, struct transfer *transfer)
 548 {
 549     char *buf, *p, *p2;
 550     size_t bufsize;
 551     wchar_t *cmd, *arg;
 552
 553     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 554         return;
 555     bufcat(transfer->filterbuf, buf, bufsize);
 556     free(buf);
 557     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 558     {
 559         *(p++) = 0;
 560         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 561             *(p2++) = 0;
 562         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 563         {
 564             arg = NULL;
 565             if(p2 != NULL)
 566             {
 567                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 568                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
 569             }
 570             handletranscmd(transfer, cmd, arg);
 571             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 572             if(arg != NULL)
 573                 free(arg);
 574             free(cmd);
 575         } else {
 576             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 577         }
 578         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 579     }
 580 }
 581
 582 static void filterexit(pid_t pid, int status, void *data)
 583 {
 584     struct transfer *transfer;
 585     struct fnet *fnet;
 586     wchar_t *peerid;
 587
 588     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 589     {
 590         if(transfer->filter == pid)
 591         {
 592             transfer->filter = -1;
 593             killfilter(transfer);
 594             fnet = transfer->fnet;
 595             peerid = swcsdup(transfer->peerid);
 596             if(WEXITSTATUS(status))
 597                 resettransfer(transfer);
 598             else
 599                 freetransfer(transfer);
 600             trytransferbypeer(fnet, peerid);
 601             free(peerid);
 602             break;
 603         }
 604     }
 605 }
 606
 607 int forkfilter(struct transfer *transfer)
 608 {
 609     char *filtername, *filename, *peerid, *buf, *p;
 610     wchar_t *wfilename;
 611     struct passwd *pwent;
 612     pid_t pid;
 613     int inpipe, outpipe;
 614     char **argv;
 615     size_t argvsize, argvdata;
 616     struct socket *insock, *outsock;
 617     struct wcspair *ta;
 618     char *rec, *val;
 619
 620     wfilename = fnfilebasename(transfer->path);
 621     if(transfer->auth == NULL)
 622     {
 623         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 624         errno = EACCES;
 625         return(-1);
 626     }
 627     if((pwent = getpwuid(transfer->owner)) == NULL)
 628     {
 629         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 630         errno = EACCES;
 631         return(-1);
 632     }
 633     filtername = findfile("dc-filter", pwent->pw_dir, 0);
 634     if(filtername == NULL)
 635         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
 636     if(filtername == NULL)
 637     {
 638         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 639         errno = ENOENT;
 640         return(-1);
 641     }
 642     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 643     {
 644         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 645         {
 646             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 647             return(-1);
 648         }
 649         filename = sprintf2("utf8-%s", buf);
 650         free(buf);
 651     }
 652     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 653     {
 654         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 655         {
 656             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 657             free(filename);
 658             return(-1);
 659         }
 660         peerid = sprintf2("utf8-%s", buf);
 661         free(buf);
 662     }
 663     for(p = filename; *p; p++) {
 664         if(*p == '/')
 665             *p = '_';
 666         else if((p == filename) && (*p == '.'))
 667             *p = '_';
 668     }
 669     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)
 670     {
 671         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 672         return(-1);
 673     }
 674     if(pid == 0)
 675     {
 676         argv = NULL;
 677         argvsize = argvdata = 0;
 678         buf = sprintf2("%ji", (intmax_t)transfer->size);
 679         addtobuf(argv, filtername);
 680         addtobuf(argv, filename);
 681         addtobuf(argv, buf);
 682         addtobuf(argv, peerid);
 683         if(transfer->hash)
 684         {
 685             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 686             {
 687                 /* XXX: I am very doubtful of this, but it can just as
 688                  * well be argued that all data should be presented as
 689                  * key-value pairs. */
 690                 addtobuf(argv, "hash");
 691                 addtobuf(argv, buf);
 692             } else {
 693                 flog(LOG_WARNING, "could not convert hash to local charset");
 694             }
 695         }
 696         for(ta = transfer->args; ta != NULL; ta = ta->next)
 697         {
 698             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 699                 continue;
 700             if((val = icwcstombs(ta->val, NULL)) == NULL)
 701                 continue;
 702             addtobuf(argv, rec);
 703             addtobuf(argv, val);
 704         }
 705         addtobuf(argv, NULL);
 706         execv(filtername, argv);
 707         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 708         exit(127);
 709     }
 710     insock = wrapsock(inpipe);
 711     outsock = wrapsock(outpipe);
 712     /* Really, really strange thing here - sometimes the kernel would
 713      * return POLLIN on insock, even though it's a write-side
 714      * pipe. The corresponding read on the pipe naturally returns
 715      * EBADF, causing doldacond to think there's something wrong with
 716      * the fd, and thus it closes it. Until I can find out whyever the
 717      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 718      * set ignread on insock for now. */
 719     sockblock(insock, 1);
 720     transfer->filter = pid;
 721     transfersetlocalend(transfer, insock);
 722     getsock(transfer->filterout = outsock);
 723     outsock->data = transfer;
 724     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 725     putsock(insock);
 726     putsock(outsock);
 727     free(filtername);
 728     free(filename);
 729     free(peerid);
 730     return(0);
 731 }
 732
 733 static int run(void)
 734 {
 735     struct transfer *transfer, *next;
 736
 737     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 738     {
 739         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 740         {
 741             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 742                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 743             closesock(transfer->localend);
 744         }
 745     }
 746     for(transfer = transfers; transfer != NULL; transfer = next)
 747     {
 748         next = transfer->next;
 749         if(transfer->close)
 750         {
 751             transferdetach(transfer);
 752             freetransfer(transfer);
 753             continue;
 754         }
 755     }
 756     return(0);
 757 }
 758
 759 static struct configvar myvars[] =
 760 {
 761     /** The maximum number of simultaneously permitted uploads. A
 762      * common hub rule is that you will need at least as many slots as
 763      * the number of hubs to which you are connected. */
 764     {CONF_VAR_INT, "slots", {.num = 3}},
 765     /** The TOS value to use for upload connections (see the TOS
 766      * VALUES section). */
 767     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 768     /** The TOS value to use for download connections (see the TOS
 769      * VALUES section). */
 770     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 771     /** The name of the filter script (see the FILES section for
 772      * lookup information). */
 773     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 774     /** If true, only one upload is allowed per remote peer. This
 775      * option is still experimental, so it is recommended to leave it
 776      * off. */
 777     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
 778     {CONF_VAR_END}
 779 };
 780
 781 static struct module me =
 782 {
 783     .conf =
 784     {
 785         .vars = myvars
 786     },
 787     .name = "transfer",
 788     .run = run
 789 };
 790
 791 MODULE(me);