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