2 * Dolda Connect - Modular multiuser Direct Connect-style client
3 * Copyright (C) 2004 Fredrik Tolf (fredrik@dolda2000.com)
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.
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.
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
40 #include "sysevents.h"
45 struct scanstate *next;
46 struct sharecache *node;
52 struct scanqueue *next;
53 struct scanstate *state;
56 static int conf_share(int argc, wchar_t **argv);
57 static void freecache(struct sharecache *node);
58 static void checkhashes(void);
59 static void writehashcache(int now);
61 static struct configvar myvars[] =
63 /** The default nick name to use. The nickname can also be
64 * specified for individual hubs, overriding this setting. */
65 {CONF_VAR_STRING, "defnick", {.str = L"DoldaConnect user"}},
66 /** When scanning shares, this bitmask is consulted for every
67 * regular file. Unless the file's mode has the bits specified by
68 * this mask set, it will not be shared. */
69 {CONF_VAR_INT, "scanfilemask", {.num = 0004}},
70 /** When scanning shares, this bitmask is consulted for every
71 * directory encountered. Unless the directory's mode has the bits
72 * specified by this mask set, it will be ignored and any files
73 * under it will not be shared. */
74 {CONF_VAR_INT, "scandirmask", {.num = 0005}},
75 /** The filename to use for the hash cache (see the FILES section
76 * for more information). */
77 {CONF_VAR_STRING, "hashcache", {.str = L"dc-hashcache"}},
81 static struct configcmd mycmds[] =
83 {"share", conf_share},
87 static struct scanstate *scanjob = NULL;
88 static struct scanqueue *scanqueue = NULL;
89 static struct sharepoint *shares = NULL;
90 static struct hashcache *hashcache = NULL;
91 static struct timer *hashwritetimer = NULL;
92 /* Set initially to -1, but changed to 0 the first time run() is
93 * called. This is to avoid forking a hash job before daemonizing,
94 * since that would make the daemon unable to wait() for the hash
96 static pid_t hashjob = -1;
97 struct sharecache *shareroot = NULL;
98 unsigned long long sharesize = 0;
99 GCBCHAIN(sharechangecb, unsigned long long);
101 static int conf_share(int argc, wchar_t **argv)
103 struct sharepoint *share;
108 flog(LOG_WARNING, "not enough arguments given for share command");
111 if((b = icwcstombs(argv[2], NULL)) == NULL)
113 flog(LOG_WARNING, "could not convert wcs path (%ls) to current locale's charset: %s", argv[2], strerror(errno));
116 for(share = shares; share != NULL; share = share->next)
118 if(!strcmp(share->path, b) && !wcscmp(share->name, argv[1]))
125 share = smalloc(sizeof(*share));
128 share->name = swcsdup(argv[1]);
129 share->next = shares;
132 shares->prev = share;
137 static void dumpsharecache(struct sharecache *node, int l)
141 for(; node != NULL; node = node->next)
143 for(i = 0; i < l; i++)
145 printf("%ls\n", node->name);
146 if(node->f.b.type == FILE_DIR)
147 dumpsharecache(node->child, l + 1);
151 struct hash *newhash(wchar_t *algo, size_t len, char *buf)
155 ret = smalloc(sizeof(*ret));
156 memset(ret, 0, sizeof(*ret));
157 ret->algo = swcsdup(algo);
159 ret->buf = memcpy(smalloc(len), buf, len);
163 void freehash(struct hash *hash)
170 struct hash *duphash(struct hash *hash)
172 return(newhash(hash->algo, hash->len, hash->buf));
175 struct hash *parsehash(wchar_t *text)
178 char *mbsbuf, *decbuf;
182 if((p = wcschr(text, L':')) == NULL)
185 if((mbsbuf = icwcstombs(p, "US-ASCII")) == NULL)
187 decbuf = base64decode(mbsbuf, &buflen);
191 ret = newhash(text, buflen, decbuf);
196 wchar_t *unparsehash(struct hash *hash)
198 static wchar_t *buf = NULL;
201 size_t bufsize, bufdata;
206 bufsize = bufdata = 0;
207 hbuf = base64encode(hash->buf, hash->len);
208 if((whbuf = icmbstowcs(hbuf, "US-ASCII")) == NULL)
210 flog(LOG_CRIT, "bug! could not convert base64 from us-ascii: %s", strerror(errno));
214 bufcat(buf, hash->algo, wcslen(hash->algo));
216 bufcat(buf, whbuf, wcslen(whbuf));
222 int hashcmp(struct hash *h1, struct hash *h2)
224 if(wcscmp(h1->algo, h2->algo))
226 if(h1->len != h2->len)
228 if(memcmp(h1->buf, h2->buf, h1->len))
233 static struct hashcache *newhashcache(void)
235 struct hashcache *new;
237 new = smalloc(sizeof(*new));
238 memset(new, 0, sizeof(*new));
239 new->next = hashcache;
241 if(hashcache != NULL)
242 hashcache->prev = new;
247 static void freehashcache(struct hashcache *hc)
250 hc->next->prev = hc->prev;
252 hc->prev->next = hc->next;
254 hashcache = hc->next;
258 static struct hashcache *findhashcache(dev_t dev, ino_t inode)
260 struct hashcache *hc;
262 for(hc = hashcache; hc != NULL; hc = hc->next)
264 if((hc->dev == dev) && (hc->inode == inode))
270 static void readhashcache(void)
276 char *p, *p2, *wv[32], *hash;
277 struct hashcache *hc;
280 if((hcname = findfile(icswcstombs(confgetstr("cli", "hashcache"), NULL, NULL), NULL, 0)) == NULL)
282 if((stream = fopen(hcname, "r")) == NULL)
284 flog(LOG_WARNING, "could not open hash cache %s: %s", hcname, strerror(errno));
287 while(hashcache != NULL)
288 freehashcache(hashcache);
292 fgets(linebuf, sizeof(linebuf), stream);
294 for(p = linebuf; *p; p++)
299 if(linebuf[0] == '#')
301 for(wc = 0, p = linebuf; (wc < 32) && ((p2 = strchr(p, ' ')) != NULL); p = p2 + 1)
311 hc->dev = strtoll(wv[0], NULL, 10);
312 hc->inode = strtoll(wv[1], NULL, 10);
313 hc->mtime = strtoll(wv[2], NULL, 10);
314 for(i = 3; i < wc; i++)
316 if(!strcmp(wv[i], "tth"))
320 hash = base64decode(wv[i], &len);
326 memcpy(hc->tth, hash, 24);
334 static void hashtimercb(int cancelled, void *uudata)
336 hashwritetimer = NULL;
341 static void writehashcache(int now)
346 struct hashcache *hc;
350 if(hashwritetimer == NULL)
351 hashwritetimer = timercallback(ntime() + 300, (void (*)(int, void *))hashtimercb, NULL);
354 if(hashwritetimer != NULL)
355 canceltimer(hashwritetimer);
356 hcname = findfile(icswcstombs(confgetstr("cli", "hashcache"), NULL, NULL), NULL, 1);
357 if((stream = fopen(hcname, "w")) == NULL)
359 flog(LOG_WARNING, "could not write hash cache %s: %s", hcname, strerror(errno));
362 fprintf(stream, "# Dolda Connect hash cache file\n");
363 fprintf(stream, "# Generated automatically, do not edit\n");
364 fprintf(stream, "# Format: DEVICE INODE MTIME [HASH...]\n");
365 fprintf(stream, "# HASH := HASHTYPE HASHVAL\n");
366 fprintf(stream, "# HASHTYPE can currently only be `tth'\n");
367 for(hc = hashcache; hc != NULL; hc = hc->next)
369 buf = base64encode(hc->tth, 24);
370 fprintf(stream, "%lli %lli %li tth %s\n", hc->dev, (long long)hc->inode, hc->mtime, buf);
376 static void hashread(struct socket *sk, void *uudata)
378 static char *hashbuf;
379 static size_t hashbufsize = 0, hashbufdata = 0;
380 char *buf, *p, *p2, *lp;
387 struct hashcache *hc;
389 if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
391 bufcat(hashbuf, buf, bufsize);
393 while((lp = memchr(hashbuf, '\n', hashbufdata)) != NULL)
400 while((p2 = strchr(p, ' ')) == p)
413 flog(LOG_ERR, "BUG: unexpected number of words (%i) arrived from hashing process", wc);
415 dev = strtoll(wv[0], NULL, 10);
416 inode = strtoll(wv[1], NULL, 10);
417 mtime = strtol(wv[2], NULL, 10);
418 if((hc = findhashcache(dev, inode)) == NULL)
425 buf = base64decode(wv[3], NULL);
426 memcpy(hc->tth, buf, 24);
430 memmove(hashbuf, lp, hashbufdata -= (lp - hashbuf));
434 static void hashexit(pid_t pid, int status, struct socket *outsock)
437 flog(LOG_ERR, "BUG: hashing process changed PID?! old: %i new %i", hashjob, pid);
439 flog(LOG_WARNING, "hashing process exited with non-zero status: %i", status);
445 static int hashfile(char *path)
452 struct tigertreehash tth;
454 struct socket *outsock;
456 if((fd = open(path, O_RDONLY)) < 0)
458 flog(LOG_WARNING, "could not open %s for hashing: %s", path, strerror(errno));
461 if(fstat(fd, &sb) < 0)
463 flog(LOG_WARNING, "could not stat %s while hashing: %s", path, strerror(errno));
469 flog(LOG_WARNING, "could not create pipe(!): %s", strerror(errno));
476 flog(LOG_WARNING, "could not fork(!) hashing process: %s", strerror(errno));
485 signal(SIGHUP, SIG_DFL);
487 pfd[1] = dup2(pfd[1], 3);
490 for(i = 3; i < FD_SETSIZE; i++)
494 while((ret = read(0, buf, 4096)) > 0)
495 dotigertree(&tth, buf, ret);
498 flog(LOG_WARNING, "could not read from %s while hashing: %s", path, strerror(errno));
502 restigertree(&tth, digest);
503 ret = snprintf(buf, sizeof(buf), "%lli %lli %li %s\n", sb.st_dev, (long long)sb.st_ino, sb.st_mtime, base64encode(digest, 24));
509 outsock = wrapsock(pfd[0]);
510 outsock->readcb = hashread;
511 childcallback(hashjob, (void (*)(pid_t, int, void *))hashexit, outsock);
516 * Call only when hashjob == 0
518 static void checkhashes(void)
520 struct sharecache *node;
521 struct hashcache *hc;
524 node = shareroot->child;
525 for(node = shareroot->child; node != NULL; node = nextscnode(node))
527 if(node->f.b.type != FILE_REG)
529 if(!node->f.b.hastth)
531 if(((hc = findhashcache(node->dev, node->inode)) != NULL) && (hc->mtime == node->mtime))
533 memcpy(node->hashtth, hc->tth, 24);
534 node->f.b.hastth = 1;
535 GCBCHAINDOCB(sharechangecb, sharesize);
537 path = getfspath(node);
540 flog(LOG_WARNING, "could not hash %s, unsharing it", path);
543 flog(LOG_INFO, "sharing %lli bytes", sharesize);
553 struct sharecache *nextscnode(struct sharecache *node)
555 if(node->child != NULL)
557 while(node->next == NULL)
560 if(node == shareroot)
566 static void freescan(struct scanstate *job)
573 /* No need for optimization; lookup isn't really that common */
574 struct sharecache *findcache(struct sharecache *parent, wchar_t *name)
576 struct sharecache *node;
578 for(node = parent->child; node != NULL; node = node->next)
580 if(!wcscmp(node->name, name))
586 static void attachcache(struct sharecache *parent, struct sharecache *node)
588 node->parent = parent;
589 node->next = parent->child;
590 if(parent->child != NULL)
591 parent->child->prev = node;
592 parent->child = node;
595 static void detachcache(struct sharecache *node)
597 if(node->next != NULL)
598 node->next->prev = node->prev;
599 if(node->prev != NULL)
600 node->prev->next = node->next;
601 if((node->parent != NULL) && (node->parent->child == node))
602 node->parent->child = node->next;
608 static void freecache(struct sharecache *node)
610 struct sharecache *cur, *next;
611 struct scanqueue *q, *nq, **fq;
615 for(q = scanqueue; q != NULL; q = nq)
618 if(q->state->node == node)
620 flog(LOG_DEBUG, "freed node %ls cancelled queued scan", node->name);
628 if(node->child != NULL)
630 for(cur = node->child; cur != NULL; cur = next)
636 CBCHAINDOCB(node, share_delete, node);
637 CBCHAINFREE(node, share_delete);
638 sharesize -= node->size;
639 if(node->path != NULL)
641 if(node->name != NULL)
646 static void freesharepoint(struct sharepoint *share)
648 struct sharecache *node;
650 if(share->next != NULL)
651 share->next->prev = share->prev;
652 if(share->prev != NULL)
653 share->prev->next = share->next;
655 shares = share->next;
656 if((node = findcache(shareroot, share->name)) != NULL)
663 static struct sharecache *newcache(void)
665 struct sharecache *new;
667 new = smalloc(sizeof(*new));
668 memset(new, 0, sizeof(*new));
669 CBCHAININIT(new, share_delete);
673 char *getfspath(struct sharecache *node)
678 buf = smalloc(bufsize = 64);
682 if(node->path != NULL)
684 if(bufsize < strlen(node->path) + strlen(buf) + 1)
685 buf = srealloc(buf, strlen(node->path) + strlen(buf) + 1);
686 memmove(buf + strlen(node->path), buf, strlen(buf) + 1);
687 memcpy(buf, node->path, strlen(node->path));
690 if((mbsname = icwcstombs(node->name, NULL)) == NULL)
692 flog(LOG_WARNING, "could not map unicode share name (%ls) into filesystem charset: %s", node->name, strerror(errno));
696 while(bufsize < strlen(mbsname) + 1 + strlen(buf) + 1)
697 buf = srealloc(buf, bufsize *= 2);
698 memmove(buf + strlen(mbsname) + 1, buf, strlen(buf) + 1);
699 memcpy(buf + 1, mbsname, strlen(mbsname));
704 buf = srealloc(buf, strlen(buf) + 1);
708 static int checknode(struct sharecache *node)
713 if(node->parent == NULL)
717 if(!checknode(node->parent))
719 path = getfspath(node);
720 if(stat(path, &sb) < 0)
722 flog(LOG_INFO, "%s was found to be broken (%s); scheduling rescan of parent", path, strerror(errno));
723 queuescan(node->parent);
731 int opensharecache(struct sharecache *node)
736 path = getfspath(node);
737 fd = open(path, O_RDONLY);
741 flog(LOG_WARNING, "could not open %s: %s", path, strerror(errbak));
749 static struct scanstate *newscan(struct sharecache *node)
751 struct scanstate *new;
753 new = smalloc(sizeof(*new));
760 void queuescan(struct sharecache *node)
762 struct scanqueue *new;
764 new = smalloc(sizeof(*new));
765 new->state = newscan(node);
766 new->next = scanqueue;
770 /* For internal use in doscan() */
771 static void removestale(struct sharecache *node)
773 struct sharecache *cur, *next;
775 for(cur = node->child; cur != NULL; cur = next)
783 /* For internal use in doscan() */
784 static void jobdone(void)
786 struct scanstate *jbuf;
789 scanjob = jbuf->next;
792 fchdir(dirfd(scanjob->dd));
795 int doscan(int quantum)
800 struct sharecache *n;
801 struct scanstate *jbuf;
802 struct scanqueue *qbuf;
805 struct hashcache *hc;
807 static int busybefore = 0;
809 dmask = confgetint("cli", "scandirmask");
810 fmask = confgetint("cli", "scanfilemask");
811 if((scanjob != NULL) && (scanjob->dd != NULL))
813 while(fchdir(dirfd(scanjob->dd)) < 0)
815 flog(LOG_WARNING, "could not fchdir to fd %i: %s", dirfd(scanjob->dd), strerror(errno));
816 removestale(scanjob->node);
826 while(scanjob == NULL)
828 if(scanqueue == NULL)
832 flog(LOG_INFO, "sharing %lli bytes", sharesize);
834 GCBCHAINDOCB(sharechangecb, sharesize);
841 scanjob = scanqueue->state;
843 scanqueue = qbuf->next;
845 for(n = scanjob->node->child; n != NULL; n = n->next)
849 if(scanjob->dd == NULL)
851 path = getfspath(scanjob->node);
852 if((scanjob->dd = opendir(path)) == NULL)
854 flog(LOG_WARNING, "cannot open directory %s for scanning: %s, deleting from share", path, strerror(errno));
855 freecache(scanjob->node);
861 if(fchdir(dirfd(scanjob->dd)) < 0)
863 flog(LOG_WARNING, "could not fchdir to fd %i: %s", dirfd(scanjob->dd), strerror(errno));
868 if((de = readdir(scanjob->dd)) == NULL)
870 removestale(scanjob->node);
874 if(*de->d_name == '.')
876 if((wcs = icmbstowcs(de->d_name, NULL)) == NULL)
878 flog(LOG_WARNING, "file name %s has cannot be converted to wchar: %s", de->d_name, strerror(errno));
881 n = findcache(scanjob->node, wcs);
882 if(stat(de->d_name, &sb) < 0)
887 flog(LOG_WARNING, "could not stat %s: %s, deleting from share", de->d_name, strerror(errno));
890 flog(LOG_WARNING, "could not stat %s: %s", de->d_name, strerror(errno));
894 if(S_ISDIR(sb.st_mode))
896 if(~sb.st_mode & dmask)
902 } else if(S_ISREG(sb.st_mode)) {
903 if(~sb.st_mode & fmask)
910 flog(LOG_WARNING, "unhandled file type: 0%o", sb.st_mode);
916 if((n->f.b.type != type) || (n->mtime != sb.st_mtime) || ((type == FILE_REG) && (n->size != sb.st_size)))
926 if(S_ISREG(sb.st_mode))
928 sharesize += (n->size = sb.st_size);
932 n->mtime = sb.st_mtime;
934 n->inode = sb.st_ino;
936 attachcache(scanjob->node, n);
941 if(n->f.b.type == FILE_DIR)
944 jbuf->next = scanjob;
946 } else if(n->f.b.type == FILE_REG) {
947 if(n->f.b.hastth && (n->mtime != sb.st_mtime))
951 if((hc = findhashcache(sb.st_dev, sb.st_ino)) != NULL)
953 if(hc->mtime == n->mtime)
956 memcpy(n->hashtth, hc->tth, 24);
967 void scanshares(void)
969 struct sharepoint *cur;
970 struct sharecache *node;
973 for(cur = shares; cur != NULL; cur = cur->next)
975 if((node = findcache(shareroot, cur->name)) == NULL)
977 if(stat(cur->path, &sb))
979 flog(LOG_WARNING, "could not stat share \"%ls\": %s", cur->name, strerror(errno));
982 if(!S_ISDIR(sb.st_mode))
984 flog(LOG_WARNING, "%s is not a directory; won't share it", cur->path);
988 node->name = swcsdup(cur->name);
989 node->path = sstrdup(cur->path);
990 if(node->path[strlen(node->path) - 1] == '/')
991 node->path[strlen(node->path) - 1] = 0;
992 node->f.b.type = FILE_DIR;
993 attachcache(shareroot, node);
999 static void preinit(int hup)
1001 struct sharepoint *cur;
1005 for(cur = shares; cur != NULL; cur = cur->next)
1008 shareroot = newcache();
1009 shareroot->name = swcsdup(L"");
1010 shareroot->f.b.type = FILE_DIR;
1014 static int init(int hup)
1016 struct sharepoint *cur, *next;
1019 for(cur = shares; cur != NULL; cur = next)
1023 freesharepoint(cur);
1031 static int run(void)
1041 static void terminate(void)
1044 kill(hashjob, SIGHUP);
1045 while(shares != NULL)
1046 freesharepoint(shares);
1047 freecache(shareroot);
1050 static struct module me =
1061 .terminate = terminate