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 char *findhashcachefile(int filldef)
260 static char ret[128];
263 if(getenv("HOME") != NULL)
265 snprintf(ret, sizeof(ret), "%s/.dc-hashcache", getenv("HOME"));
266 if(!access(ret, R_OK))
269 if((hcname = icswcstombs(confgetstr("cli", "hashcache"), NULL, NULL)) == NULL)
271 flog(LOG_WARNING, "could not convert hash cache name into local charset: %s", strerror(errno));
274 if(strchr(hcname, '/') != NULL)
276 if(!access(hcname, R_OK))
282 snprintf(ret, sizeof(ret), "/etc/%s", hcname);
283 if(!access(ret, R_OK))
285 snprintf(ret, sizeof(ret), "/usr/etc/%s", hcname);
286 if(!access(ret, R_OK))
288 snprintf(ret, sizeof(ret), "/usr/local/etc/%s", hcname);
289 if(!access(ret, R_OK))
294 if(getenv("HOME") != NULL)
295 snprintf(ret, sizeof(ret), "%s/.dc-hashcache", getenv("HOME"));
297 snprintf(ret, sizeof(ret), "/etc/%s", hcname);
304 static struct hashcache *findhashcache(dev_t dev, ino_t inode)
306 struct hashcache *hc;
308 for(hc = hashcache; hc != NULL; hc = hc->next)
310 if((hc->dev == dev) && (hc->inode == inode))
316 static void readhashcache(void)
322 char *p, *p2, *wv[32], *hash;
323 struct hashcache *hc;
326 if((hcname = findhashcachefile(0)) == NULL)
328 if((stream = fopen(hcname, "r")) == NULL)
330 flog(LOG_WARNING, "could not open hash cache %s: %s", hcname, strerror(errno));
333 while(hashcache != NULL)
334 freehashcache(hashcache);
338 fgets(linebuf, sizeof(linebuf), stream);
340 for(p = linebuf; *p; p++)
345 if(linebuf[0] == '#')
347 for(wc = 0, p = linebuf; (wc < 32) && ((p2 = strchr(p, ' ')) != NULL); p = p2 + 1)
357 hc->dev = strtoll(wv[0], NULL, 10);
358 hc->inode = strtoll(wv[1], NULL, 10);
359 hc->mtime = strtoll(wv[2], NULL, 10);
360 for(i = 3; i < wc; i++)
362 if(!strcmp(wv[i], "tth"))
366 hash = base64decode(wv[i], &len);
372 memcpy(hc->tth, hash, 24);
380 static void hashtimercb(int cancelled, void *uudata)
382 hashwritetimer = NULL;
387 static void writehashcache(int now)
392 struct hashcache *hc;
396 if(hashwritetimer == NULL)
397 hashwritetimer = timercallback(ntime() + 300, (void (*)(int, void *))hashtimercb, NULL);
400 if(hashwritetimer != NULL)
401 canceltimer(hashwritetimer);
402 hcname = findhashcachefile(1);
403 if((stream = fopen(hcname, "w")) == NULL)
405 flog(LOG_WARNING, "could not write hash cache %s: %s", hcname, strerror(errno));
408 fprintf(stream, "# Dolda Connect hash cache file\n");
409 fprintf(stream, "# Generated automatically, do not edit\n");
410 fprintf(stream, "# Format: DEVICE INODE MTIME [HASH...]\n");
411 fprintf(stream, "# HASH := HASHTYPE HASHVAL\n");
412 fprintf(stream, "# HASHTYPE can currently only be `tth'\n");
413 for(hc = hashcache; hc != NULL; hc = hc->next)
415 buf = base64encode(hc->tth, 24);
416 fprintf(stream, "%lli %lli %li tth %s\n", hc->dev, (long long)hc->inode, hc->mtime, buf);
422 static void hashread(struct socket *sk, void *uudata)
424 static char *hashbuf;
425 static size_t hashbufsize = 0, hashbufdata = 0;
426 char *buf, *p, *p2, *lp;
433 struct hashcache *hc;
435 if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
437 bufcat(hashbuf, buf, bufsize);
439 while((lp = memchr(hashbuf, '\n', hashbufdata)) != NULL)
446 while((p2 = strchr(p, ' ')) == p)
459 flog(LOG_ERR, "BUG: unexpected number of words (%i) arrived from hashing process", wc);
461 dev = strtoll(wv[0], NULL, 10);
462 inode = strtoll(wv[1], NULL, 10);
463 mtime = strtol(wv[2], NULL, 10);
464 if((hc = findhashcache(dev, inode)) == NULL)
471 buf = base64decode(wv[3], NULL);
472 memcpy(hc->tth, buf, 24);
476 memmove(hashbuf, lp, hashbufdata -= (lp - hashbuf));
480 static void hashexit(pid_t pid, int status, struct socket *outsock)
483 flog(LOG_ERR, "BUG: hashing process changed PID?! old: %i new %i", hashjob, pid);
485 flog(LOG_WARNING, "hashing process exited with non-zero status: %i", status);
491 static int hashfile(char *path)
498 struct tigertreehash tth;
500 struct socket *outsock;
502 if((fd = open(path, O_RDONLY)) < 0)
504 flog(LOG_WARNING, "could not open %s for hashing: %s", path, strerror(errno));
507 if(fstat(fd, &sb) < 0)
509 flog(LOG_WARNING, "could not stat %s while hashing: %s", path, strerror(errno));
515 flog(LOG_WARNING, "could not create pipe(!): %s", strerror(errno));
522 flog(LOG_WARNING, "could not fork(!) hashing process: %s", strerror(errno));
531 signal(SIGHUP, SIG_DFL);
533 pfd[1] = dup2(pfd[1], 3);
536 for(i = 3; i < FD_SETSIZE; i++)
540 while((ret = read(0, buf, 4096)) > 0)
541 dotigertree(&tth, buf, ret);
544 flog(LOG_WARNING, "could not read from %s while hashing: %s", path, strerror(errno));
548 restigertree(&tth, digest);
549 ret = snprintf(buf, sizeof(buf), "%lli %lli %li %s\n", sb.st_dev, (long long)sb.st_ino, sb.st_mtime, base64encode(digest, 24));
555 outsock = wrapsock(pfd[0]);
556 outsock->readcb = hashread;
557 childcallback(hashjob, (void (*)(pid_t, int, void *))hashexit, outsock);
562 * Call only when hashjob == 0
564 static void checkhashes(void)
566 struct sharecache *node;
567 struct hashcache *hc;
570 node = shareroot->child;
571 for(node = shareroot->child; node != NULL; node = nextscnode(node))
573 if(node->f.b.type != FILE_REG)
575 if(!node->f.b.hastth)
577 if(((hc = findhashcache(node->dev, node->inode)) != NULL) && (hc->mtime == node->mtime))
579 memcpy(node->hashtth, hc->tth, 24);
580 node->f.b.hastth = 1;
581 GCBCHAINDOCB(sharechangecb, sharesize);
583 path = getfspath(node);
586 flog(LOG_WARNING, "could not hash %s, unsharing it", path);
589 flog(LOG_INFO, "sharing %lli bytes", sharesize);
599 struct sharecache *nextscnode(struct sharecache *node)
601 if(node->child != NULL)
603 while(node->next == NULL)
606 if(node == shareroot)
612 static void freescan(struct scanstate *job)
619 /* No need for optimization; lookup isn't really that common */
620 struct sharecache *findcache(struct sharecache *parent, wchar_t *name)
622 struct sharecache *node;
624 for(node = parent->child; node != NULL; node = node->next)
626 if(!wcscmp(node->name, name))
632 static void attachcache(struct sharecache *parent, struct sharecache *node)
634 node->parent = parent;
635 node->next = parent->child;
636 if(parent->child != NULL)
637 parent->child->prev = node;
638 parent->child = node;
641 static void detachcache(struct sharecache *node)
643 if(node->next != NULL)
644 node->next->prev = node->prev;
645 if(node->prev != NULL)
646 node->prev->next = node->next;
647 if((node->parent != NULL) && (node->parent->child == node))
648 node->parent->child = node->next;
654 static void freecache(struct sharecache *node)
656 struct sharecache *cur, *next;
657 struct scanqueue *q, *nq, **fq;
661 for(q = scanqueue; q != NULL; q = nq)
664 if(q->state->node == node)
666 flog(LOG_DEBUG, "freed node %ls cancelled queued scan", node->name);
674 if(node->child != NULL)
676 for(cur = node->child; cur != NULL; cur = next)
682 CBCHAINDOCB(node, share_delete, node);
683 CBCHAINFREE(node, share_delete);
684 sharesize -= node->size;
685 if(node->path != NULL)
687 if(node->name != NULL)
692 static void freesharepoint(struct sharepoint *share)
694 struct sharecache *node;
696 if(share->next != NULL)
697 share->next->prev = share->prev;
698 if(share->prev != NULL)
699 share->prev->next = share->next;
701 shares = share->next;
702 if((node = findcache(shareroot, share->name)) != NULL)
709 static struct sharecache *newcache(void)
711 struct sharecache *new;
713 new = smalloc(sizeof(*new));
714 memset(new, 0, sizeof(*new));
715 CBCHAININIT(new, share_delete);
719 char *getfspath(struct sharecache *node)
724 buf = smalloc(bufsize = 64);
728 if(node->path != NULL)
730 if(bufsize < strlen(node->path) + strlen(buf) + 1)
731 buf = srealloc(buf, strlen(node->path) + strlen(buf) + 1);
732 memmove(buf + strlen(node->path), buf, strlen(buf) + 1);
733 memcpy(buf, node->path, strlen(node->path));
736 if((mbsname = icwcstombs(node->name, NULL)) == NULL)
738 flog(LOG_WARNING, "could not map unicode share name (%ls) into filesystem charset: %s", node->name, strerror(errno));
742 while(bufsize < strlen(mbsname) + 1 + strlen(buf) + 1)
743 buf = srealloc(buf, bufsize *= 2);
744 memmove(buf + strlen(mbsname) + 1, buf, strlen(buf) + 1);
745 memcpy(buf + 1, mbsname, strlen(mbsname));
750 buf = srealloc(buf, strlen(buf) + 1);
754 static int checknode(struct sharecache *node)
759 if(node->parent == NULL)
763 if(!checknode(node->parent))
765 path = getfspath(node);
766 if(stat(path, &sb) < 0)
768 flog(LOG_INFO, "%s was found to be broken (%s); scheduling rescan of parent", path, strerror(errno));
769 queuescan(node->parent);
777 int opensharecache(struct sharecache *node)
782 path = getfspath(node);
783 fd = open(path, O_RDONLY);
787 flog(LOG_WARNING, "could not open %s: %s", path, strerror(errbak));
795 static struct scanstate *newscan(struct sharecache *node)
797 struct scanstate *new;
799 new = smalloc(sizeof(*new));
806 void queuescan(struct sharecache *node)
808 struct scanqueue *new;
810 new = smalloc(sizeof(*new));
811 new->state = newscan(node);
812 new->next = scanqueue;
816 /* For internal use in doscan() */
817 static void removestale(struct sharecache *node)
819 struct sharecache *cur, *next;
821 for(cur = node->child; cur != NULL; cur = next)
829 /* For internal use in doscan() */
830 static void jobdone(void)
832 struct scanstate *jbuf;
835 scanjob = jbuf->next;
838 fchdir(dirfd(scanjob->dd));
841 int doscan(int quantum)
846 struct sharecache *n;
847 struct scanstate *jbuf;
848 struct scanqueue *qbuf;
851 struct hashcache *hc;
853 static int busybefore = 0;
855 dmask = confgetint("cli", "scandirmask");
856 fmask = confgetint("cli", "scanfilemask");
857 if((scanjob != NULL) && (scanjob->dd != NULL))
859 while(fchdir(dirfd(scanjob->dd)) < 0)
861 flog(LOG_WARNING, "could not fchdir to fd %i: %s", dirfd(scanjob->dd), strerror(errno));
862 removestale(scanjob->node);
872 while(scanjob == NULL)
874 if(scanqueue == NULL)
878 flog(LOG_INFO, "sharing %lli bytes", sharesize);
880 GCBCHAINDOCB(sharechangecb, sharesize);
887 scanjob = scanqueue->state;
889 scanqueue = qbuf->next;
891 for(n = scanjob->node->child; n != NULL; n = n->next)
895 if(scanjob->dd == NULL)
897 path = getfspath(scanjob->node);
898 if((scanjob->dd = opendir(path)) == NULL)
900 flog(LOG_WARNING, "cannot open directory %s for scanning: %s, deleting from share", path, strerror(errno));
901 freecache(scanjob->node);
907 if(fchdir(dirfd(scanjob->dd)) < 0)
909 flog(LOG_WARNING, "could not fchdir to fd %i: %s", dirfd(scanjob->dd), strerror(errno));
914 if((de = readdir(scanjob->dd)) == NULL)
916 removestale(scanjob->node);
920 if(*de->d_name == '.')
922 if((wcs = icmbstowcs(de->d_name, NULL)) == NULL)
924 flog(LOG_WARNING, "file name %s has cannot be converted to wchar: %s", de->d_name, strerror(errno));
927 n = findcache(scanjob->node, wcs);
928 if(stat(de->d_name, &sb) < 0)
933 flog(LOG_WARNING, "could not stat %s: %s, deleting from share", de->d_name, strerror(errno));
936 flog(LOG_WARNING, "could not stat %s: %s", de->d_name, strerror(errno));
940 if(S_ISDIR(sb.st_mode))
942 if(~sb.st_mode & dmask)
948 } else if(S_ISREG(sb.st_mode)) {
949 if(~sb.st_mode & fmask)
956 flog(LOG_WARNING, "unhandled file type: 0%o", sb.st_mode);
962 if((n->f.b.type != type) || (n->mtime != sb.st_mtime) || ((type == FILE_REG) && (n->size != sb.st_size)))
972 if(S_ISREG(sb.st_mode))
974 sharesize += (n->size = sb.st_size);
978 n->mtime = sb.st_mtime;
980 n->inode = sb.st_ino;
982 attachcache(scanjob->node, n);
987 if(n->f.b.type == FILE_DIR)
990 jbuf->next = scanjob;
992 } else if(n->f.b.type == FILE_REG) {
993 if(n->f.b.hastth && (n->mtime != sb.st_mtime))
997 if((hc = findhashcache(sb.st_dev, sb.st_ino)) != NULL)
999 if(hc->mtime == n->mtime)
1002 memcpy(n->hashtth, hc->tth, 24);
1013 void scanshares(void)
1015 struct sharepoint *cur;
1016 struct sharecache *node;
1019 for(cur = shares; cur != NULL; cur = cur->next)
1021 if((node = findcache(shareroot, cur->name)) == NULL)
1023 if(stat(cur->path, &sb))
1025 flog(LOG_WARNING, "could not stat share \"%ls\": %s", cur->name, strerror(errno));
1028 if(!S_ISDIR(sb.st_mode))
1030 flog(LOG_WARNING, "%s is not a directory; won't share it", cur->path);
1034 node->name = swcsdup(cur->name);
1035 node->path = sstrdup(cur->path);
1036 if(node->path[strlen(node->path) - 1] == '/')
1037 node->path[strlen(node->path) - 1] = 0;
1038 node->f.b.type = FILE_DIR;
1039 attachcache(shareroot, node);
1045 static void preinit(int hup)
1047 struct sharepoint *cur;
1051 for(cur = shares; cur != NULL; cur = cur->next)
1054 shareroot = newcache();
1055 shareroot->name = swcsdup(L"");
1056 shareroot->f.b.type = FILE_DIR;
1060 static int init(int hup)
1062 struct sharepoint *cur, *next;
1065 for(cur = shares; cur != NULL; cur = next)
1069 freesharepoint(cur);
1077 static int run(void)
1087 static void terminate(void)
1090 kill(hashjob, SIGHUP);
1091 while(shares != NULL)
1092 freesharepoint(shares);
1093 freecache(shareroot);
1096 static struct module me =
1107 .terminate = terminate