484 lines
13 KiB
C
484 lines
13 KiB
C
/*
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Copyright (c) 2014 Anton Titov.
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Copyright (c) 2014 pCloud Ltd. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met: Redistributions of source code must retain the above
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copyright notice, this list of conditions and the following
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disclaimer. Redistributions in binary form must reproduce the
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above copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution. Neither the name of pCloud Ltd nor the
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names of its contributors may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL pCloud
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Ltd BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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*/
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#include <pthread.h>
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#include <string.h>
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#include "pcryptofolder.h"
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#include "pfoldersync.h"
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#include "pfs.h"
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#include "pfsfolder.h"
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#include "pfstasks.h"
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#include "plibs.h"
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#include "pmem.h"
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#include "psys.h"
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#include "pdbg.h"
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#include "psql.h"
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static PSYNC_THREAD int cryptoerr = 0;
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static inline int psync_crypto_is_error(const void *ptr) {
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return (uintptr_t)ptr <= PSYNC_CRYPTO_MAX_ERROR;
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}
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static inline int psync_crypto_to_error(const void *ptr) {
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return -((int)(uintptr_t)ptr);
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}
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static char *get_encname_for_folder(psync_fsfolderid_t folderid,
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const char *path, size_t len) {
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char *name, *encname;
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pcrypto_textenc_t enc;
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enc = pcryptofolder_fldencoder_get(folderid);
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if (psync_crypto_is_error(enc)) {
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cryptoerr = psync_crypto_to_error(enc);
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return NULL;
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}
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name = putil_strndup(path, len);
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encname = pcryptofolder_fldencode_filename(enc, name);
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pcryptofolder_fldencoder_release(folderid, enc);
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pmem_free(PMEM_SUBSYS_OTHER, name);
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return encname;
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}
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static psync_fspath_t *ret_folder_data(psync_fsfolderid_t folderid,
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const char *name, uint32_t permissions,
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uint32_t flags, uint32_t shareid) {
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psync_fspath_t *ret;
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if (flags & PSYNC_FOLDER_FLAG_ENCRYPTED &&
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strncmp(pfs_fake_prefix, name, pfs_fake_prefix_len)) {
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pcrypto_textenc_t enc;
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char *encname;
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size_t len;
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enc = pcryptofolder_fldencoder_get(folderid);
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if (psync_crypto_is_error(enc)) {
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cryptoerr = psync_crypto_to_error(enc);
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return NULL;
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}
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encname = pcryptofolder_fldencode_filename(enc, name);
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pcryptofolder_fldencoder_release(folderid, enc);
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len = strlen(encname);
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ret = (psync_fspath_t *)pmem_malloc(PMEM_SUBSYS_OTHER, sizeof(psync_fspath_t) + len + 1);
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memcpy(ret + 1, encname, len + 1);
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pmem_free(PMEM_SUBSYS_OTHER, encname);
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ret->folderid = folderid;
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ret->name = (char *)(ret + 1);
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ret->shareid = shareid;
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ret->permissions = permissions;
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ret->flags = flags;
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} else {
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ret = pmem_malloc(PMEM_SUBSYS_OTHER, sizeof(psync_fspath_t));
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ret->folderid = folderid;
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ret->name = name;
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ret->shareid = shareid;
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ret->permissions = permissions;
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ret->flags = flags;
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}
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return ret;
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}
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char *pfs_fldr_get_decname(psync_fsfolderid_t folderid, const char *path,
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size_t len) {
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char *name, *decname;
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pcrypto_textdec_t dec;
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dec = pcryptofolder_flddecoder_get(folderid);
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if (psync_crypto_is_error(dec)) {
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cryptoerr = psync_crypto_to_error(dec);
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return NULL;
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}
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name = putil_strndup(path, len);
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decname = pcryptofolder_flddecode_filename(dec, name);
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pcryptofolder_flddecoder_release(folderid, dec);
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pmem_free(PMEM_SUBSYS_OTHER, name);
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return decname;
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}
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PSYNC_NOINLINE void do_check_userid(uint64_t userid, uint64_t folderid,
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uint32_t *shareid) {
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psync_sql_res *res;
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psync_uint_row row;
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res = psql_query_rdlock(
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"SELECT id FROM sharedfolder WHERE userid=? AND folderid=?");
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psql_bind_uint(res, 1, userid);
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psql_bind_uint(res, 2, folderid);
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if ((row = psql_fetch_int(res)))
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*shareid = row[0];
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else
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pdbg_logf(D_WARNING,
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"came up to a folder %lu owned by userid %lu but can't find it in "
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"sharedfolder",
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(unsigned long)folderid, (unsigned long)userid);
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psql_free(res);
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}
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static void check_userid(uint64_t userid, uint64_t folderid,
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uint32_t *shareid) {
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if (userid == psync_my_userid || *shareid)
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return;
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else
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do_check_userid(userid, folderid, shareid);
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}
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psync_fspath_t *pfs_fldr_resolve_path(const char *path) {
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psync_fsfolderid_t cfolderid;
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const char *sl;
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psync_fstask_folder_t *folder;
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psync_fstask_mkdir_t *mk;
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psync_sql_res *res;
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psync_uint_row row;
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char *ename;
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size_t len, elen;
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uint32_t permissions, flags, shareid;
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int hasit;
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cryptoerr = 0;
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res = NULL;
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if (*path != '/')
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return NULL;
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cfolderid = 0;
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shareid = 0;
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permissions = PSYNC_PERM_ALL;
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flags = 0;
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while (1) {
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while (*path == '/')
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path++;
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if (*path == 0) {
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if (res)
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psql_free(res);
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return NULL;
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}
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sl = strchr(path, '/');
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if (sl)
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len = sl - path;
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else {
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if (res)
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psql_free(res);
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return ret_folder_data(cfolderid, path, permissions, flags, shareid);
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}
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if (!res)
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res = psql_query_rdlock("SELECT id, permissions, flags, userid FROM "
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"folder WHERE parentfolderid=? AND name=?");
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else
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psql_reset(res);
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psql_bind_int(res, 1, cfolderid);
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if (flags & PSYNC_FOLDER_FLAG_ENCRYPTED) {
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ename = get_encname_for_folder(cfolderid, path, len);
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if (!ename)
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break;
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elen = strlen(ename);
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psql_bind_lstr(res, 2, ename, elen);
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} else {
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psql_bind_lstr(res, 2, path, len);
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ename = (char *)path;
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elen = len;
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}
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row = psql_fetch_int(res);
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folder = pfs_task_get_folder_tasks_rdlocked(cfolderid);
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if (folder) {
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char *name = putil_strndup(ename, elen);
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if ((mk = pfs_task_find_mkdir(folder, name, 0))) {
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if (mk->flags & PSYNC_FOLDER_FLAG_INVISIBLE) {
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pmem_free(PMEM_SUBSYS_OTHER, name);
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break;
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}
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cfolderid = mk->folderid;
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flags = mk->flags;
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hasit = 1;
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} else if (row && !pfs_task_find_rmdir(folder, name, 0)) {
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cfolderid = row[0];
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permissions &= row[1];
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flags = row[2];
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hasit = 1;
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check_userid(row[3], row[0], &shareid);
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} else
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hasit = 0;
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pmem_free(PMEM_SUBSYS_OTHER, name);
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} else {
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if (row) {
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cfolderid = row[0];
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permissions = row[1];
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flags = row[2];
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check_userid(row[3], row[0], &shareid);
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hasit = 1;
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} else
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hasit = 0;
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}
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if (ename != path)
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pmem_free(PMEM_SUBSYS_OTHER, ename);
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if (!hasit)
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break;
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path += len;
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}
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if (res)
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psql_free(res);
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return NULL;
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}
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psync_fsfolderid_t pfs_fldr_id_by_path(const char *path,
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uint32_t *pflags) {
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psync_fsfolderid_t cfolderid;
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const char *sl;
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psync_fstask_folder_t *folder;
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psync_fstask_mkdir_t *mk;
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psync_sql_res *res;
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psync_uint_row row;
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char *ename;
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size_t len, elen;
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uint32_t flags;
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int hasit;
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res = NULL;
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cryptoerr = 0;
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if (*path != '/')
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return PSYNC_INVALID_FSFOLDERID;
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cfolderid = 0;
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flags = 0;
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while (1) {
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while (*path == '/')
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path++;
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if (*path == 0) {
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if (res)
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psql_free(res);
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if (pflags)
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*pflags = flags;
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return cfolderid;
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}
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sl = strchr(path, '/');
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if (sl)
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len = sl - path;
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else
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len = strlen(path);
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if (!res)
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res = psql_query_rdlock("SELECT id, flags, permissions FROM folder "
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"WHERE parentfolderid=? AND name=?");
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else
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psql_reset(res);
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psql_bind_int(res, 1, cfolderid);
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if (flags & PSYNC_FOLDER_FLAG_ENCRYPTED) {
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ename = get_encname_for_folder(cfolderid, path, len);
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if (!ename)
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break;
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elen = strlen(ename);
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psql_bind_lstr(res, 2, ename, elen);
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} else {
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psql_bind_lstr(res, 2, path, len);
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ename = (char *)path;
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elen = len;
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}
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row = psql_fetch_int(res);
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folder = pfs_task_get_folder_tasks_rdlocked(cfolderid);
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if (folder) {
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char *name = putil_strndup(ename, elen);
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if ((mk = pfs_task_find_mkdir(folder, name, 0))) {
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cfolderid = mk->folderid;
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flags = mk->flags;
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hasit = 1;
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} else if (row && !pfs_task_find_rmdir(folder, name, 0)) {
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cfolderid = row[0];
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flags = row[1];
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hasit = 1;
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} else
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hasit = 0;
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pmem_free(PMEM_SUBSYS_OTHER, name);
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} else {
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if (row) {
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cfolderid = row[0];
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flags = row[1];
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hasit = 1;
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} else
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hasit = 0;
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}
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if (ename != path)
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pmem_free(PMEM_SUBSYS_OTHER, ename);
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if (!hasit)
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break;
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path += len;
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}
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if (res)
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psql_free(res);
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return PSYNC_INVALID_FSFOLDERID;
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}
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psync_fsfolderid_t pfs_fldr_idperm_by_path(const char *path,
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uint32_t *pflags,
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uint32_t *pPermissions) {
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psync_fsfolderid_t cfolderid;
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const char *sl;
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psync_fstask_folder_t *folder;
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psync_fstask_mkdir_t *mk;
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psync_sql_res *res;
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psync_uint_row row;
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char *ename;
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size_t len, elen;
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uint32_t flags;
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int hasit;
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res = NULL;
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cryptoerr = 0;
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if (*path != '/')
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return PSYNC_INVALID_FSFOLDERID;
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cfolderid = 0;
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flags = 0;
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*pPermissions = 0;
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while (1) {
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while (*path == '/')
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path++;
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if (*path == 0) {
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if (res)
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psql_free(res);
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if (pflags)
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*pflags = flags;
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return cfolderid;
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}
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sl = strchr(path, '/');
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if (sl)
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len = sl - path;
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else
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len = strlen(path);
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if (!res)
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res = psql_query_rdlock("SELECT id, flags, permissions FROM folder "
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"WHERE parentfolderid=? AND name=?");
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else
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psql_reset(res);
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psql_bind_int(res, 1, cfolderid);
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if (flags & PSYNC_FOLDER_FLAG_ENCRYPTED) {
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ename = get_encname_for_folder(cfolderid, path, len);
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if (!ename)
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break;
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elen = strlen(ename);
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psql_bind_lstr(res, 2, ename, elen);
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} else {
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psql_bind_lstr(res, 2, path, len);
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ename = (char *)path;
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elen = len;
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}
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row = psql_fetch_int(res);
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folder = pfs_task_get_folder_tasks_rdlocked(cfolderid);
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if (folder) {
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char *name = putil_strndup(ename, elen);
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if ((mk = pfs_task_find_mkdir(folder, name, 0))) {
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cfolderid = mk->folderid;
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flags = mk->flags;
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hasit = 1;
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} else if (row && !pfs_task_find_rmdir(folder, name, 0)) {
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cfolderid = row[0];
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flags = row[1];
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*pPermissions = row[2];
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hasit = 1;
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} else
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hasit = 0;
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pmem_free(PMEM_SUBSYS_OTHER, name);
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} else {
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if (row) {
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cfolderid = row[0];
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flags = row[1];
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*pPermissions = row[2];
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hasit = 1;
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} else
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hasit = 0;
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}
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if (ename != path)
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pmem_free(PMEM_SUBSYS_OTHER, ename);
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if (!hasit)
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break;
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path += len;
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}
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if (res)
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psql_free(res);
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return PSYNC_INVALID_FSFOLDERID;
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}
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int pfs_fldr_crypto_error() { return cryptoerr; }
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uint32_t pfs_fldr_flags_by_id(psync_fsfolderid_t folderid,
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uint32_t *pperm) {
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psync_sql_res *res;
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psync_uint_row row;
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uint32_t ret = 0;
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if (pperm)
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*pperm = 0;
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retry:
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if (psql_trylock()) {
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psys_sleep_milliseconds(1);
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goto retry;
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}
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res = psql_query_nolock(
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"SELECT flags, permissions FROM folder WHERE id=?");
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psql_bind_int(res, 1, folderid);
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row = psql_fetch_int(res);
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if (!row) {
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pdbg_logf(D_NOTICE, "Error reading flags by file id!");
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psql_free(res);
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psql_unlock();
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return 0;
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}
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if (pperm)
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*pperm = row[1];
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ret = row[0];
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psql_free(res);
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psql_unlock();
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return ret;
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}
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/*********************************************************************************************************************/
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psync_fsfolderid_t pfs_fldr_get_folderid(psync_fsfolderid_t parent_fid,
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const char *name) {
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psync_fsfolderid_t folder_id = -1;
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psync_sql_res *res;
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psync_uint_row row;
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res = psql_query_nolock(
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"SELECT id FROM folder WHERE parentfolderid=? AND name=?");
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psql_bind_uint(res, 1, parent_fid);
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psql_bind_str(res, 2, name);
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row = psql_fetch_int(res);
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if (row) {
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folder_id = row[0];
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psql_free(res);
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}
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return folder_id;
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}
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/*********************************************************************************************************************/
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