daemon/transfer.c

   1 /*
   2  *  Dolda Connect - Modular multiuser Direct Connect-style client
   3  *  Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 */
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <signal.h>
  25 #include <pwd.h>
  26 #include <grp.h>
  27 #include <errno.h>
  28 #include <sys/wait.h>
  29 #include <stdint.h>
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include <config.h>
  33 #endif
  34 #include "log.h"
  35 #include "utils.h"
  36 #include "sysevents.h"
  37 #include "auth.h"
  38 #include "transfer.h"
  39 #include "module.h"
  40 #include "client.h"
  41
  42 static void killfilter(struct transfer *transfer);
  43
  44 unsigned long long bytesupload = 0;
  45 unsigned long long bytesdownload = 0;
  46 struct transfer *transfers = NULL;
  47 int numtransfers = 0;
  48 GCBCHAIN(newtransfercb, struct transfer *);
  49
  50 void freetransfer(struct transfer *transfer)
  51 {
  52     if(transfer == transfers)
  53         transfers = transfer->next;
  54     if(transfer->next != NULL)
  55         transfer->next->prev = transfer->prev;
  56     if(transfer->prev != NULL)
  57         transfer->prev->next = transfer->next;
  58     CBCHAINDOCB(transfer, trans_destroy, transfer);
  59     CBCHAINFREE(transfer, trans_ac);
  60     CBCHAINFREE(transfer, trans_act);
  61     CBCHAINFREE(transfer, trans_p);
  62     CBCHAINFREE(transfer, trans_destroy);
  63     CBCHAINFREE(transfer, trans_filterout);
  64     while(transfer->args != NULL)
  65         freewcspair(transfer->args, &transfer->args);
  66     if(transfer->filter != -1)
  67         killfilter(transfer);
  68     if(transfer->etimer != NULL)
  69         canceltimer(transfer->etimer);
  70     if(transfer->auth != NULL)
  71         authputhandle(transfer->auth);
  72     if(transfer->peerid != NULL)
  73         free(transfer->peerid);
  74     if(transfer->peernick != NULL)
  75         free(transfer->peernick);
  76     if(transfer->path != NULL)
  77         free(transfer->path);
  78     if(transfer->actdesc != NULL)
  79         free(transfer->actdesc);
  80     if(transfer->filterbuf != NULL)
  81         free(transfer->filterbuf);
  82     if(transfer->hash != NULL)
  83         freehash(transfer->hash);
  84     if(transfer->exitstatus != NULL)
  85         free(transfer->exitstatus);
  86     if(transfer->localend != NULL)
  87     {
  88         transfer->localend->readcb = NULL;
  89         transfer->localend->writecb = NULL;
  90         transfer->localend->errcb = NULL;
  91         putsock(transfer->localend);
  92     }
  93     if(transfer->filterout != NULL)
  94     {
  95         transfer->filterout->readcb = NULL;
  96         transfer->filterout->writecb = NULL;
  97         transfer->filterout->errcb = NULL;
  98         putsock(transfer->filterout);
  99     }
 100     if(transfer->fn != NULL)
 101         putfnetnode(transfer->fn);
 102     free(transfer);
 103     numtransfers--;
 104 }
 105
 106 struct transfer *newtransfer(void)
 107 {
 108     struct transfer *new;
 109     static int curid = 0;
 110
 111     new = smalloc(sizeof(*new));
 112     memset(new, 0, sizeof(*new));
 113     new->id = curid++;
 114     new->size = -1;
 115     new->endpos = -1;
 116     new->filter = -1;
 117     CBCHAININIT(new, trans_ac);
 118     CBCHAININIT(new, trans_act);
 119     CBCHAININIT(new, trans_p);
 120     CBCHAININIT(new, trans_destroy);
 121     CBCHAININIT(new, trans_filterout);
 122     new->next = NULL;
 123     new->prev = NULL;
 124     time(&new->activity);
 125     numtransfers++;
 126     return(new);
 127 }
 128
 129 static void localread(struct socket *sk, struct transfer *transfer)
 130 {
 131     void *buf;
 132     size_t blen;
 133
 134     if((transfer->datapipe != NULL) && (sockqueueleft(transfer->datapipe) > 0)) {
 135         buf = sockgetinbuf(sk, &blen);
 136         if((transfer->endpos >= 0) && (transfer->curpos + blen > transfer->endpos))
 137             blen = transfer->endpos - transfer->curpos;
 138         sockqueue(transfer->datapipe, buf, blen);
 139         free(buf);
 140         time(&transfer->activity);
 141         transfer->curpos += blen;
 142         bytesupload += blen;
 143         CBCHAINDOCB(transfer, trans_p, transfer);
 144     }
 145 }
 146
 147 static void dataread(struct socket *sk, struct transfer *transfer)
 148 {
 149     void *buf;
 150     size_t blen;
 151
 152     if((transfer->localend != NULL) && (sockqueueleft(transfer->localend) > 0)) {
 153         buf = sockgetinbuf(sk, &blen);
 154         if((transfer->endpos >= 0) && (transfer->curpos + blen > transfer->endpos))
 155             blen = transfer->endpos - transfer->curpos;
 156         sockqueue(transfer->localend, buf, blen);
 157         free(buf);
 158         transfer->curpos += blen;
 159         bytesdownload += blen;
 160         CBCHAINDOCB(transfer, trans_p, transfer);
 161     }
 162 }
 163
 164 static void localwrite(struct socket *sk, struct transfer *transfer)
 165 {
 166     if(transfer->datapipe != NULL)
 167         dataread(transfer->datapipe, transfer);
 168 }
 169
 170 static void datawrite(struct socket *sk, struct transfer *transfer)
 171 {
 172     if(transfer->localend != NULL)
 173         localread(transfer->localend, transfer);
 174 }
 175
 176 static void localerr(struct socket *sk, int errno, struct transfer *transfer)
 177 {
 178     if(transfer->datapipe != NULL)
 179         closesock(transfer->datapipe);
 180 }
 181
 182 static void dataerr(struct socket *sk, int errno, struct transfer *transfer)
 183 {
 184     if(transfer->curpos >= transfer->size) {
 185         transfersetstate(transfer, TRNS_DONE);
 186         if(transfer->localend != NULL) {
 187             closesock(transfer->localend);
 188             quitsock(transfer->localend);
 189             transfer->localend = NULL;
 190         }
 191     } else {
 192         if(transfer->dir == TRNSD_DOWN)
 193             resettransfer(transfer);
 194         else if(transfer->dir == TRNSD_UP)
 195             transfer->close = 1;
 196     }
 197 }
 198
 199 void transferattach(struct transfer *transfer, struct socket *dpipe)
 200 {
 201     transferdetach(transfer);
 202     getsock(transfer->datapipe = dpipe);
 203     dpipe->readcb = (void (*)(struct socket *, void *))dataread;
 204     dpipe->writecb = (void (*)(struct socket *, void *))datawrite;
 205     dpipe->errcb = (void (*)(struct socket *, int, void *))dataerr;
 206     dpipe->data = transfer;
 207 }
 208
 209 void transferdetach(struct transfer *transfer)
 210 {
 211     if(transfer->datapipe != NULL) {
 212         closesock(transfer->datapipe);
 213         quitsock(transfer->datapipe);
 214     }
 215     transfer->datapipe = NULL;
 216 }
 217
 218 struct transfer *finddownload(wchar_t *peerid)
 219 {
 220     struct transfer *transfer;
 221
 222     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 223     {
 224         if((transfer->dir == TRNSD_DOWN) && (transfer->datapipe == NULL) && !wcscmp(peerid, transfer->peerid))
 225             break;
 226     }
 227     return(transfer);
 228 }
 229
 230 struct transfer *hasupload(struct fnet *fnet, wchar_t *peerid)
 231 {
 232     struct transfer *transfer;
 233
 234     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 235     {
 236         if((transfer->dir == TRNSD_UP) && (transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 237             break;
 238     }
 239     return(transfer);
 240 }
 241
 242 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct socket *dpipe)
 243 {
 244     struct transfer *transfer;
 245
 246     transfer = newtransfer();
 247     if(fnet != NULL)
 248         transfer->fnet = fnet;
 249     else
 250         transfer->fnet = fn->fnet;
 251     transfer->peerid = swcsdup(nickid);
 252     transfer->state = TRNS_HS;
 253     transfer->dir = TRNSD_UP;
 254     if(fn != NULL)
 255         getfnetnode(transfer->fn = fn);
 256     transferattach(transfer, dpipe);
 257     linktransfer(transfer);
 258     bumptransfer(transfer);
 259     return(transfer);
 260 }
 261
 262 void linktransfer(struct transfer *transfer)
 263 {
 264     transfer->next = transfers;
 265     transfer->prev = NULL;
 266     if(transfers != NULL)
 267         transfers->prev = transfer;
 268     transfers = transfer;
 269     GCBCHAINDOCB(newtransfercb, transfer);
 270 }
 271
 272 void resettransfer(struct transfer *transfer)
 273 {
 274     if(transfer->dir == TRNSD_DOWN)
 275     {
 276         transferdetach(transfer);
 277         killfilter(transfer);
 278         transfersetstate(transfer, TRNS_WAITING);
 279         transfersetactivity(transfer, L"reset");
 280         return;
 281     }
 282 }
 283
 284 struct transfer *findtransfer(int id)
 285 {
 286     struct transfer *transfer;
 287
 288     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 289     {
 290         if(transfer->id == id)
 291             break;
 292     }
 293     return(transfer);
 294 }
 295
 296 static void transexpire(int cancelled, struct transfer *transfer)
 297 {
 298     transfer->etimer = NULL;
 299     if(!cancelled)
 300         bumptransfer(transfer);
 301     else
 302         transfer->timeout = 0;
 303 }
 304
 305 void transferprepul(struct transfer *transfer, off_t size, off_t start, off_t end, struct socket *lesk)
 306 {
 307     transfersetsize(transfer, size);
 308     transfer->curpos = start;
 309     transfer->endpos = end;
 310     transfersetlocalend(transfer, lesk);
 311 }
 312
 313 void transferstartdl(struct transfer *transfer, struct socket *sk)
 314 {
 315     transfersetstate(transfer, TRNS_MAIN);
 316     socksettos(sk, confgetint("transfer", "dltos"));
 317 }
 318
 319 void transferstartul(struct transfer *transfer, struct socket *sk)
 320 {
 321     transfersetstate(transfer, TRNS_MAIN);
 322     socksettos(sk, confgetint("transfer", "ultos"));
 323     if(transfer->localend != NULL)
 324         localread(transfer->localend, transfer);
 325 }
 326
 327 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 328 {
 329     if(transfer->localend != NULL)
 330         putsock(transfer->localend);
 331     getsock(transfer->localend = sk);
 332     sk->data = transfer;
 333     sk->readcb = (void (*)(struct socket *, void *))localread;
 334     sk->writecb = (void (*)(struct socket *, void *))localwrite;
 335     sk->errcb = (void (*)(struct socket *, int, void *))localerr;
 336 }
 337
 338 static int tryreq(struct transfer *transfer)
 339 {
 340     struct fnetnode *fn;
 341     struct fnetpeer *peer;
 342
 343     if((fn = transfer->fn) != NULL)
 344     {
 345         if(fn->state != FNN_EST)
 346         {
 347             transfer->close = 1;
 348             return(1);
 349         }
 350         peer = fnetfindpeer(fn, transfer->peerid);
 351     } else {
 352         peer = NULL;
 353         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 354         {
 355             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 356                 break;
 357         }
 358     }
 359     if(peer != NULL)
 360     {
 361         time(&transfer->lastreq);
 362         return(fn->fnet->reqconn(peer));
 363     }
 364     return(1);
 365 }
 366
 367 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 368 {
 369     struct transfer *transfer;
 370
 371     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 372     {
 373         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 374         {
 375             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 376             {
 377                 if(!tryreq(transfer))
 378                     return;
 379             }
 380         }
 381     }
 382 }
 383
 384 void bumptransfer(struct transfer *transfer)
 385 {
 386     time_t now;
 387
 388     if((now = time(NULL)) < transfer->timeout)
 389     {
 390
 391         if(transfer->etimer == NULL)
 392             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 393         return;
 394     }
 395     if(transfer->etimer != NULL)
 396         canceltimer(transfer->etimer);
 397     switch(transfer->state)
 398     {
 399     case TRNS_WAITING:
 400         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 401         if(now - transfer->lastreq > 30)
 402             tryreq(transfer);
 403         break;
 404     case TRNS_HS:
 405         if(transfer->dir == TRNSD_UP)
 406         {
 407             if(now - transfer->activity < 60)
 408                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 409             else
 410                 transfer->close = 1;
 411         } else if(transfer->dir == TRNSD_DOWN) {
 412             if(now - transfer->activity < 60)
 413                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 414             else
 415                 resettransfer(transfer);
 416         }
 417         break;
 418     case TRNS_MAIN:
 419         if(transfer->dir == TRNSD_UP)
 420         {
 421             if(now - transfer->activity < 300)
 422                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 423             else
 424                 transfer->close = 1;
 425         }
 426         break;
 427     }
 428 }
 429
 430 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 431 {
 432     time(&transfer->activity);
 433     if(desc != NULL)
 434     {
 435         if(transfer->actdesc != NULL)
 436             free(transfer->actdesc);
 437         transfer->actdesc = swcsdup(desc);
 438     }
 439     bumptransfer(transfer);
 440     CBCHAINDOCB(transfer, trans_act, transfer);
 441 }
 442
 443 void transfersetstate(struct transfer *transfer, int newstate)
 444 {
 445     transfer->state = newstate;
 446     if(transfer->etimer != NULL)
 447         canceltimer(transfer->etimer);
 448     transfersetactivity(transfer, NULL);
 449     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 450 }
 451
 452 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 453 {
 454     if(transfer->peernick != NULL)
 455         free(transfer->peernick);
 456     transfer->peernick = swcsdup(newnick);
 457     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 458 }
 459
 460 void transfersetsize(struct transfer *transfer, off_t newsize)
 461 {
 462     transfer->size = newsize;
 463     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 464 }
 465
 466 void transferseterror(struct transfer *transfer, int error)
 467 {
 468     transfer->error = error;
 469     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 470 }
 471
 472 void transfersetpath(struct transfer *transfer, wchar_t *path)
 473 {
 474     if(transfer->path != NULL)
 475         free(transfer->path);
 476     transfer->path = swcsdup(path);
 477     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 478 }
 479
 480 void transfersethash(struct transfer *transfer, struct hash *hash)
 481 {
 482     if(transfer->hash != NULL)
 483         freehash(transfer->hash);
 484     transfer->hash = hash;
 485     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 486 }
 487
 488 int slotsleft(void)
 489 {
 490     struct transfer *transfer;
 491     int slots;
 492
 493     slots = confgetint("transfer", "slots");
 494     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 495     {
 496         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 497             slots--;
 498     }
 499     return(slots);
 500 }
 501
 502 static void killfilter(struct transfer *transfer)
 503 {
 504     if(transfer->filter != -1)
 505     {
 506         kill(-transfer->filter, SIGHUP);
 507         transfer->filter = -1;
 508     }
 509     if(transfer->localend)
 510     {
 511         transfer->localend->readcb = NULL;
 512         transfer->localend->writecb = NULL;
 513         transfer->localend->errcb = NULL;
 514         putsock(transfer->localend);
 515         transfer->localend = NULL;
 516     }
 517     if(transfer->filterout)
 518     {
 519         transfer->filterout->readcb = NULL;
 520         putsock(transfer->filterout);
 521         transfer->filterout = NULL;
 522     }
 523     if(transfer->filterbuf)
 524     {
 525         free(transfer->filterbuf);
 526         transfer->filterbuf = NULL;
 527     }
 528     transfer->filterbufsize = transfer->filterbufdata = 0;
 529 }
 530
 531 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
 532 {
 533     if(!wcscmp(cmd, L"status")) {
 534         if(arg == NULL)
 535             arg = L"";
 536         if(transfer->exitstatus != NULL)
 537             free(transfer->exitstatus);
 538         transfer->exitstatus = swcsdup(arg);
 539     }
 540 }
 541
 542 static void filterread(struct socket *sk, struct transfer *transfer)
 543 {
 544     char *buf, *p, *p2;
 545     size_t bufsize;
 546     wchar_t *cmd, *arg;
 547
 548     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 549         return;
 550     bufcat(transfer->filterbuf, buf, bufsize);
 551     free(buf);
 552     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 553     {
 554         *(p++) = 0;
 555         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 556             *(p2++) = 0;
 557         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 558         {
 559             arg = NULL;
 560             if(p2 != NULL)
 561             {
 562                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 563                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
 564             }
 565             handletranscmd(transfer, cmd, arg);
 566             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 567             if(arg != NULL)
 568                 free(arg);
 569             free(cmd);
 570         } else {
 571             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 572         }
 573         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 574     }
 575 }
 576
 577 static void filterexit(pid_t pid, int status, void *data)
 578 {
 579     struct transfer *transfer;
 580     struct fnet *fnet;
 581     wchar_t *peerid;
 582
 583     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 584     {
 585         if(transfer->filter == pid)
 586         {
 587             transfer->filter = -1;
 588             killfilter(transfer);
 589             fnet = transfer->fnet;
 590             peerid = swcsdup(transfer->peerid);
 591             if(WEXITSTATUS(status))
 592                 resettransfer(transfer);
 593             else
 594                 freetransfer(transfer);
 595             trytransferbypeer(fnet, peerid);
 596             free(peerid);
 597             break;
 598         }
 599     }
 600 }
 601
 602 int forkfilter(struct transfer *transfer)
 603 {
 604     char *filtername, *filename, *peerid, *buf, *p;
 605     wchar_t *wfilename;
 606     struct passwd *pwent;
 607     pid_t pid;
 608     int inpipe, outpipe;
 609     char **argv;
 610     size_t argvsize, argvdata;
 611     struct socket *insock, *outsock;
 612     struct wcspair *ta;
 613     char *rec, *val;
 614
 615     wfilename = fnfilebasename(transfer->path);
 616     if(transfer->auth == NULL)
 617     {
 618         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 619         errno = EACCES;
 620         return(-1);
 621     }
 622     if((pwent = getpwuid(transfer->owner)) == NULL)
 623     {
 624         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 625         errno = EACCES;
 626         return(-1);
 627     }
 628     filtername = findfile("dc-filter", pwent->pw_dir, 0);
 629     if(filtername == NULL)
 630         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
 631     if(filtername == NULL)
 632     {
 633         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 634         errno = ENOENT;
 635         return(-1);
 636     }
 637     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 638     {
 639         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 640         {
 641             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 642             return(-1);
 643         }
 644         filename = sprintf2("utf8-%s", buf);
 645         free(buf);
 646     }
 647     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 648     {
 649         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 650         {
 651             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 652             free(filename);
 653             return(-1);
 654         }
 655         peerid = sprintf2("utf8-%s", buf);
 656         free(buf);
 657     }
 658     for(p = filename; *p; p++) {
 659         if(*p == '/')
 660             *p = '_';
 661         else if((p == filename) && (*p == '.'))
 662             *p = '_';
 663     }
 664     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)
 665     {
 666         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 667         return(-1);
 668     }
 669     if(pid == 0)
 670     {
 671         argv = NULL;
 672         argvsize = argvdata = 0;
 673         buf = sprintf2("%ji", (intmax_t)transfer->size);
 674         addtobuf(argv, filtername);
 675         addtobuf(argv, filename);
 676         addtobuf(argv, buf);
 677         addtobuf(argv, peerid);
 678         if(transfer->hash)
 679         {
 680             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 681             {
 682                 /* XXX: I am very doubtful of this, but it can just as
 683                  * well be argued that all data should be presented as
 684                  * key-value pairs. */
 685                 addtobuf(argv, "hash");
 686                 addtobuf(argv, buf);
 687             } else {
 688                 flog(LOG_WARNING, "could not convert hash to local charset");
 689             }
 690         }
 691         for(ta = transfer->args; ta != NULL; ta = ta->next)
 692         {
 693             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 694                 continue;
 695             if((val = icwcstombs(ta->val, NULL)) == NULL)
 696                 continue;
 697             addtobuf(argv, rec);
 698             addtobuf(argv, val);
 699         }
 700         addtobuf(argv, NULL);
 701         execv(filtername, argv);
 702         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 703         exit(127);
 704     }
 705     insock = wrapsock(inpipe);
 706     outsock = wrapsock(outpipe);
 707     /* Really, really strange thing here - sometimes the kernel would
 708      * return POLLIN on insock, even though it's a write-side
 709      * pipe. The corresponding read on the pipe naturally returns
 710      * EBADF, causing doldacond to think there's something wrong with
 711      * the fd, and thus it closes it. Until I can find out whyever the
 712      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 713      * set ignread on insock for now. */
 714 /*     sockblock(insock, 1); */
 715     transfer->filter = pid;
 716     transfersetlocalend(transfer, insock);
 717     getsock(transfer->filterout = outsock);
 718     outsock->data = transfer;
 719     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 720     putsock(insock);
 721     putsock(outsock);
 722     free(filtername);
 723     free(filename);
 724     free(peerid);
 725     return(0);
 726 }
 727
 728 static int run(void)
 729 {
 730     struct transfer *transfer, *next;
 731
 732     /*
 733     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 734     {
 735         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 736         {
 737             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 738                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 739             closesock(transfer->localend);
 740         }
 741     }
 742     */
 743     for(transfer = transfers; transfer != NULL; transfer = next)
 744     {
 745         next = transfer->next;
 746         if(transfer->close)
 747         {
 748             transferdetach(transfer);
 749             freetransfer(transfer);
 750             continue;
 751         }
 752     }
 753     return(0);
 754 }
 755
 756 static struct configvar myvars[] =
 757 {
 758     /** The maximum number of simultaneously permitted uploads. A
 759      * common hub rule is that you will need at least as many slots as
 760      * the number of hubs to which you are connected. */
 761     {CONF_VAR_INT, "slots", {.num = 3}},
 762     /** The TOS value to use for upload connections (see the TOS
 763      * VALUES section). */
 764     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 765     /** The TOS value to use for download connections (see the TOS
 766      * VALUES section). */
 767     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 768     /** The name of the filter script (see the FILES section for
 769      * lookup information). */
 770     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 771     /** If true, only one upload is allowed per remote peer. This
 772      * option is still experimental, so it is recommended to leave it
 773      * off. */
 774     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
 775     {CONF_VAR_END}
 776 };
 777
 778 static struct module me =
 779 {
 780     .conf =
 781     {
 782         .vars = myvars
 783     },
 784     .name = "transfer",
 785     .run = run
 786 };
 787
 788 MODULE(me);