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         resettransfer(transfer);
 193     }
 194 }
 195
 196 void transferattach(struct transfer *transfer, struct socket *dpipe)
 197 {
 198     transferdetach(transfer);
 199     getsock(transfer->datapipe = dpipe);
 200     dpipe->readcb = (void (*)(struct socket *, void *))dataread;
 201     dpipe->writecb = (void (*)(struct socket *, void *))datawrite;
 202     dpipe->errcb = (void (*)(struct socket *, int, void *))dataerr;
 203     dpipe->data = transfer;
 204 }
 205
 206 void transferdetach(struct transfer *transfer)
 207 {
 208     if(transfer->datapipe != NULL) {
 209         closesock(transfer->datapipe);
 210         quitsock(transfer->datapipe);
 211     }
 212     transfer->datapipe = NULL;
 213 }
 214
 215 struct transfer *finddownload(wchar_t *peerid)
 216 {
 217     struct transfer *transfer;
 218
 219     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 220     {
 221         if((transfer->dir == TRNSD_DOWN) && (transfer->datapipe == NULL) && !wcscmp(peerid, transfer->peerid))
 222             break;
 223     }
 224     return(transfer);
 225 }
 226
 227 struct transfer *hasupload(struct fnet *fnet, wchar_t *peerid)
 228 {
 229     struct transfer *transfer;
 230
 231     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 232     {
 233         if((transfer->dir == TRNSD_UP) && (transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 234             break;
 235     }
 236     return(transfer);
 237 }
 238
 239 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct socket *dpipe)
 240 {
 241     struct transfer *transfer;
 242
 243     transfer = newtransfer();
 244     if(fnet != NULL)
 245         transfer->fnet = fnet;
 246     else
 247         transfer->fnet = fn->fnet;
 248     transfer->peerid = swcsdup(nickid);
 249     transfer->state = TRNS_HS;
 250     transfer->dir = TRNSD_UP;
 251     if(fn != NULL)
 252         getfnetnode(transfer->fn = fn);
 253     transferattach(transfer, dpipe);
 254     linktransfer(transfer);
 255     bumptransfer(transfer);
 256     return(transfer);
 257 }
 258
 259 void linktransfer(struct transfer *transfer)
 260 {
 261     transfer->next = transfers;
 262     transfer->prev = NULL;
 263     if(transfers != NULL)
 264         transfers->prev = transfer;
 265     transfers = transfer;
 266     GCBCHAINDOCB(newtransfercb, transfer);
 267 }
 268
 269 void resettransfer(struct transfer *transfer)
 270 {
 271     if(transfer->dir == TRNSD_DOWN)
 272     {
 273         transferdetach(transfer);
 274         killfilter(transfer);
 275         transfersetstate(transfer, TRNS_WAITING);
 276         transfersetactivity(transfer, L"reset");
 277         return;
 278     }
 279 }
 280
 281 struct transfer *findtransfer(int id)
 282 {
 283     struct transfer *transfer;
 284
 285     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 286     {
 287         if(transfer->id == id)
 288             break;
 289     }
 290     return(transfer);
 291 }
 292
 293 static void transexpire(int cancelled, struct transfer *transfer)
 294 {
 295     transfer->etimer = NULL;
 296     if(!cancelled)
 297         bumptransfer(transfer);
 298     else
 299         transfer->timeout = 0;
 300 }
 301
 302 void transferprepul(struct transfer *transfer, off_t size, off_t start, off_t end, struct socket *lesk)
 303 {
 304     transfersetsize(transfer, size);
 305     transfer->curpos = start;
 306     transfer->endpos = end;
 307     transfersetlocalend(transfer, lesk);
 308 }
 309
 310 void transferstartdl(struct transfer *transfer, struct socket *sk)
 311 {
 312     transfersetstate(transfer, TRNS_MAIN);
 313     socksettos(sk, confgetint("transfer", "dltos"));
 314 }
 315
 316 void transferstartul(struct transfer *transfer, struct socket *sk)
 317 {
 318     transfersetstate(transfer, TRNS_MAIN);
 319     socksettos(sk, confgetint("transfer", "ultos"));
 320     if(transfer->localend != NULL)
 321         localread(transfer->localend, transfer);
 322 }
 323
 324 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 325 {
 326     if(transfer->localend != NULL)
 327         putsock(transfer->localend);
 328     socksetdebug(sk, 2, "localend");
 329     getsock(transfer->localend = sk);
 330     sk->data = transfer;
 331     sk->readcb = (void (*)(struct socket *, void *))localread;
 332     sk->writecb = (void (*)(struct socket *, void *))localwrite;
 333     sk->errcb = (void (*)(struct socket *, int, void *))localerr;
 334 }
 335
 336 static int tryreq(struct transfer *transfer)
 337 {
 338     struct fnetnode *fn;
 339     struct fnetpeer *peer;
 340
 341     if((fn = transfer->fn) != NULL)
 342     {
 343         if(fn->state != FNN_EST)
 344         {
 345             transfer->close = 1;
 346             return(1);
 347         }
 348         peer = fnetfindpeer(fn, transfer->peerid);
 349     } else {
 350         peer = NULL;
 351         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 352         {
 353             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 354                 break;
 355         }
 356     }
 357     if(peer != NULL)
 358     {
 359         time(&transfer->lastreq);
 360         return(fn->fnet->reqconn(peer));
 361     }
 362     return(1);
 363 }
 364
 365 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 366 {
 367     struct transfer *transfer;
 368
 369     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 370     {
 371         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 372         {
 373             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 374             {
 375                 if(!tryreq(transfer))
 376                     return;
 377             }
 378         }
 379     }
 380 }
 381
 382 void bumptransfer(struct transfer *transfer)
 383 {
 384     time_t now;
 385
 386     if((now = time(NULL)) < transfer->timeout)
 387     {
 388
 389         if(transfer->etimer == NULL)
 390             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 391         return;
 392     }
 393     if(transfer->etimer != NULL)
 394         canceltimer(transfer->etimer);
 395     switch(transfer->state)
 396     {
 397     case TRNS_WAITING:
 398         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 399         if(now - transfer->lastreq > 30)
 400             tryreq(transfer);
 401         break;
 402     case TRNS_HS:
 403         if(transfer->dir == TRNSD_UP)
 404         {
 405             if(now - transfer->activity < 60)
 406                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 407             else
 408                 transfer->close = 1;
 409         } else if(transfer->dir == TRNSD_DOWN) {
 410             if(now - transfer->activity < 60)
 411                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 412             else
 413                 resettransfer(transfer);
 414         }
 415         break;
 416     case TRNS_MAIN:
 417         if(transfer->dir == TRNSD_UP)
 418         {
 419             if(now - transfer->activity < 300)
 420                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 421             else
 422                 transfer->close = 1;
 423         }
 424         break;
 425     }
 426 }
 427
 428 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 429 {
 430     time(&transfer->activity);
 431     if(desc != NULL)
 432     {
 433         if(transfer->actdesc != NULL)
 434             free(transfer->actdesc);
 435         transfer->actdesc = swcsdup(desc);
 436     }
 437     bumptransfer(transfer);
 438     CBCHAINDOCB(transfer, trans_act, transfer);
 439 }
 440
 441 void transfersetstate(struct transfer *transfer, int newstate)
 442 {
 443     transfer->state = newstate;
 444     if(transfer->etimer != NULL)
 445         canceltimer(transfer->etimer);
 446     transfersetactivity(transfer, NULL);
 447     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 448 }
 449
 450 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 451 {
 452     if(transfer->peernick != NULL)
 453         free(transfer->peernick);
 454     transfer->peernick = swcsdup(newnick);
 455     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 456 }
 457
 458 void transfersetsize(struct transfer *transfer, off_t newsize)
 459 {
 460     transfer->size = newsize;
 461     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 462 }
 463
 464 void transferseterror(struct transfer *transfer, int error)
 465 {
 466     transfer->error = error;
 467     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 468 }
 469
 470 void transfersetpath(struct transfer *transfer, wchar_t *path)
 471 {
 472     if(transfer->path != NULL)
 473         free(transfer->path);
 474     transfer->path = swcsdup(path);
 475     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 476 }
 477
 478 void transfersethash(struct transfer *transfer, struct hash *hash)
 479 {
 480     if(transfer->hash != NULL)
 481         freehash(transfer->hash);
 482     transfer->hash = hash;
 483     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 484 }
 485
 486 int slotsleft(void)
 487 {
 488     struct transfer *transfer;
 489     int slots;
 490
 491     slots = confgetint("transfer", "slots");
 492     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 493     {
 494         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 495             slots--;
 496     }
 497     return(slots);
 498 }
 499
 500 static void killfilter(struct transfer *transfer)
 501 {
 502     if(transfer->filter != -1)
 503     {
 504         kill(-transfer->filter, SIGHUP);
 505         transfer->filter = -1;
 506     }
 507     if(transfer->localend)
 508     {
 509         transfer->localend->readcb = NULL;
 510         transfer->localend->writecb = NULL;
 511         transfer->localend->errcb = NULL;
 512         putsock(transfer->localend);
 513         transfer->localend = NULL;
 514     }
 515     if(transfer->filterout)
 516     {
 517         transfer->filterout->readcb = NULL;
 518         putsock(transfer->filterout);
 519         transfer->filterout = NULL;
 520     }
 521     if(transfer->filterbuf)
 522     {
 523         free(transfer->filterbuf);
 524         transfer->filterbuf = NULL;
 525     }
 526     transfer->filterbufsize = transfer->filterbufdata = 0;
 527 }
 528
 529 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
 530 {
 531     if(!wcscmp(cmd, L"status")) {
 532         if(arg == NULL)
 533             arg = L"";
 534         if(transfer->exitstatus != NULL)
 535             free(transfer->exitstatus);
 536         transfer->exitstatus = swcsdup(arg);
 537     }
 538 }
 539
 540 static void filterread(struct socket *sk, struct transfer *transfer)
 541 {
 542     char *buf, *p, *p2;
 543     size_t bufsize;
 544     wchar_t *cmd, *arg;
 545
 546     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 547         return;
 548     bufcat(transfer->filterbuf, buf, bufsize);
 549     free(buf);
 550     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 551     {
 552         *(p++) = 0;
 553         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 554             *(p2++) = 0;
 555         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 556         {
 557             arg = NULL;
 558             if(p2 != NULL)
 559             {
 560                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 561                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
 562             }
 563             handletranscmd(transfer, cmd, arg);
 564             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 565             if(arg != NULL)
 566                 free(arg);
 567             free(cmd);
 568         } else {
 569             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 570         }
 571         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 572     }
 573 }
 574
 575 static void filterexit(pid_t pid, int status, void *data)
 576 {
 577     struct transfer *transfer;
 578     struct fnet *fnet;
 579     wchar_t *peerid;
 580
 581     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 582     {
 583         if(transfer->filter == pid)
 584         {
 585             transfer->filter = -1;
 586             killfilter(transfer);
 587             fnet = transfer->fnet;
 588             peerid = swcsdup(transfer->peerid);
 589             if(WEXITSTATUS(status))
 590                 resettransfer(transfer);
 591             else
 592                 freetransfer(transfer);
 593             trytransferbypeer(fnet, peerid);
 594             free(peerid);
 595             break;
 596         }
 597     }
 598 }
 599
 600 int forkfilter(struct transfer *transfer)
 601 {
 602     char *filtername, *filename, *peerid, *buf, *p;
 603     wchar_t *wfilename;
 604     struct passwd *pwent;
 605     pid_t pid;
 606     int inpipe, outpipe;
 607     char **argv;
 608     size_t argvsize, argvdata;
 609     struct socket *insock, *outsock;
 610     struct wcspair *ta;
 611     char *rec, *val;
 612
 613     wfilename = fnfilebasename(transfer->path);
 614     if(transfer->auth == NULL)
 615     {
 616         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 617         errno = EACCES;
 618         return(-1);
 619     }
 620     if((pwent = getpwuid(transfer->owner)) == NULL)
 621     {
 622         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 623         errno = EACCES;
 624         return(-1);
 625     }
 626     filtername = findfile("dc-filter", pwent->pw_dir, 0);
 627     if(filtername == NULL)
 628         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
 629     if(filtername == NULL)
 630     {
 631         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 632         errno = ENOENT;
 633         return(-1);
 634     }
 635     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 636     {
 637         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 638         {
 639             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 640             return(-1);
 641         }
 642         filename = sprintf2("utf8-%s", buf);
 643         free(buf);
 644     }
 645     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 646     {
 647         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 648         {
 649             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 650             free(filename);
 651             return(-1);
 652         }
 653         peerid = sprintf2("utf8-%s", buf);
 654         free(buf);
 655     }
 656     for(p = filename; *p; p++) {
 657         if(*p == '/')
 658             *p = '_';
 659         else if((p == filename) && (*p == '.'))
 660             *p = '_';
 661     }
 662     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)
 663     {
 664         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 665         return(-1);
 666     }
 667     if(pid == 0)
 668     {
 669         argv = NULL;
 670         argvsize = argvdata = 0;
 671         buf = sprintf2("%ji", (intmax_t)transfer->size);
 672         addtobuf(argv, filtername);
 673         addtobuf(argv, filename);
 674         addtobuf(argv, buf);
 675         addtobuf(argv, peerid);
 676         if(transfer->hash)
 677         {
 678             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 679             {
 680                 /* XXX: I am very doubtful of this, but it can just as
 681                  * well be argued that all data should be presented as
 682                  * key-value pairs. */
 683                 addtobuf(argv, "hash");
 684                 addtobuf(argv, buf);
 685             } else {
 686                 flog(LOG_WARNING, "could not convert hash to local charset");
 687             }
 688         }
 689         for(ta = transfer->args; ta != NULL; ta = ta->next)
 690         {
 691             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 692                 continue;
 693             if((val = icwcstombs(ta->val, NULL)) == NULL)
 694                 continue;
 695             addtobuf(argv, rec);
 696             addtobuf(argv, val);
 697         }
 698         addtobuf(argv, NULL);
 699         execv(filtername, argv);
 700         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 701         exit(127);
 702     }
 703     insock = wrapsock(inpipe);
 704     outsock = wrapsock(outpipe);
 705     /* Really, really strange thing here - sometimes the kernel would
 706      * return POLLIN on insock, even though it's a write-side
 707      * pipe. The corresponding read on the pipe naturally returns
 708      * EBADF, causing doldacond to think there's something wrong with
 709      * the fd, and thus it closes it. Until I can find out whyever the
 710      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 711      * set ignread on insock for now. */
 712 /*     sockblock(insock, 1); */
 713     transfer->filter = pid;
 714     transfersetlocalend(transfer, insock);
 715     getsock(transfer->filterout = outsock);
 716     outsock->data = transfer;
 717     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 718     putsock(insock);
 719     putsock(outsock);
 720     free(filtername);
 721     free(filename);
 722     free(peerid);
 723     return(0);
 724 }
 725
 726 static int run(void)
 727 {
 728     struct transfer *transfer, *next;
 729
 730     /*
 731     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 732     {
 733         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 734         {
 735             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 736                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 737             closesock(transfer->localend);
 738         }
 739     }
 740     */
 741     for(transfer = transfers; transfer != NULL; transfer = next)
 742     {
 743         next = transfer->next;
 744         if(transfer->close)
 745         {
 746             transferdetach(transfer);
 747             freetransfer(transfer);
 748             continue;
 749         }
 750     }
 751     return(0);
 752 }
 753
 754 static struct configvar myvars[] =
 755 {
 756     /** The maximum number of simultaneously permitted uploads. A
 757      * common hub rule is that you will need at least as many slots as
 758      * the number of hubs to which you are connected. */
 759     {CONF_VAR_INT, "slots", {.num = 3}},
 760     /** The TOS value to use for upload connections (see the TOS
 761      * VALUES section). */
 762     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 763     /** The TOS value to use for download connections (see the TOS
 764      * VALUES section). */
 765     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 766     /** The name of the filter script (see the FILES section for
 767      * lookup information). */
 768     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 769     /** If true, only one upload is allowed per remote peer. This
 770      * option is still experimental, so it is recommended to leave it
 771      * off. */
 772     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
 773     {CONF_VAR_END}
 774 };
 775
 776 static struct module me =
 777 {
 778     .conf =
 779     {
 780         .vars = myvars
 781     },
 782     .name = "transfer",
 783     .run = run
 784 };
 785
 786 MODULE(me);