diff options
Diffstat (limited to 'source4/tdb/tdbutil.c')
| -rw-r--r-- | source4/tdb/tdbutil.c | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/source4/tdb/tdbutil.c b/source4/tdb/tdbutil.c new file mode 100644 index 0000000000..0d8f6128cc --- /dev/null +++ b/source4/tdb/tdbutil.c @@ -0,0 +1,687 @@ +/* + Unix SMB/CIFS implementation. + tdb utility functions + Copyright (C) Andrew Tridgell 1992-1998 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include <fnmatch.h> + +/* these are little tdb utility functions that are meant to make + dealing with a tdb database a little less cumbersome in Samba */ + +static SIG_ATOMIC_T gotalarm; + +/*************************************************************** + Signal function to tell us we timed out. +****************************************************************/ + +static void gotalarm_sig(void) +{ + gotalarm = 1; +} + +/*************************************************************** + Make a TDB_DATA and keep the const warning in one place +****************************************************************/ + +static TDB_DATA make_tdb_data(const char *dptr, size_t dsize) +{ + TDB_DATA ret; + ret.dptr = dptr; + ret.dsize = dsize; + return ret; +} + +/**************************************************************************** + Lock a chain with timeout (in seconds). +****************************************************************************/ + +static int tdb_chainlock_with_timeout_internal( TDB_CONTEXT *tdb, TDB_DATA key, unsigned int timeout, int rw_type) +{ + /* Allow tdb_chainlock to be interrupted by an alarm. */ + int ret; + gotalarm = 0; + tdb_set_lock_alarm(&gotalarm); + + if (timeout) { + CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig); + alarm(timeout); + } + + if (rw_type == F_RDLCK) + ret = tdb_chainlock_read(tdb, key); + else + ret = tdb_chainlock(tdb, key); + + if (timeout) { + alarm(0); + CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN); + if (gotalarm) { + DEBUG(0,("tdb_chainlock_with_timeout_internal: alarm (%u) timed out for key %s in tdb %s\n", + timeout, key.dptr, tdb->name )); + /* TODO: If we time out waiting for a lock, it might + * be nice to use F_GETLK to get the pid of the + * process currently holding the lock and print that + * as part of the debugging message. -- mbp */ + return -1; + } + } + + return ret; +} + +/**************************************************************************** + Write lock a chain. Return -1 if timeout or lock failed. +****************************************************************************/ + +int tdb_chainlock_with_timeout( TDB_CONTEXT *tdb, TDB_DATA key, unsigned int timeout) +{ + return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_WRLCK); +} + +/**************************************************************************** + Lock a chain by string. Return -1 if timeout or lock failed. +****************************************************************************/ + +int tdb_lock_bystring(TDB_CONTEXT *tdb, const char *keyval, unsigned int timeout) +{ + TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1); + + return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_WRLCK); +} + +/**************************************************************************** + Unlock a chain by string. +****************************************************************************/ + +void tdb_unlock_bystring(TDB_CONTEXT *tdb, const char *keyval) +{ + TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1); + + tdb_chainunlock(tdb, key); +} + +/**************************************************************************** + Read lock a chain by string. Return -1 if timeout or lock failed. +****************************************************************************/ + +int tdb_read_lock_bystring(TDB_CONTEXT *tdb, const char *keyval, unsigned int timeout) +{ + TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1); + + return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_RDLCK); +} + +/**************************************************************************** + Read unlock a chain by string. +****************************************************************************/ + +void tdb_read_unlock_bystring(TDB_CONTEXT *tdb, const char *keyval) +{ + TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1); + + tdb_chainunlock_read(tdb, key); +} + + +/**************************************************************************** + Fetch a int32 value by a arbitrary blob key, return -1 if not found. + Output is int32 in native byte order. +****************************************************************************/ + +int32 tdb_fetch_int32_byblob(TDB_CONTEXT *tdb, const char *keyval, size_t len) +{ + TDB_DATA key = make_tdb_data(keyval, len); + TDB_DATA data; + int32 ret; + + data = tdb_fetch(tdb, key); + if (!data.dptr || data.dsize != sizeof(int32)) { + SAFE_FREE(data.dptr); + return -1; + } + + ret = IVAL(data.dptr,0); + SAFE_FREE(data.dptr); + return ret; +} + +/**************************************************************************** + Fetch a int32 value by string key, return -1 if not found. + Output is int32 in native byte order. +****************************************************************************/ + +int32 tdb_fetch_int32(TDB_CONTEXT *tdb, const char *keystr) +{ + return tdb_fetch_int32_byblob(tdb, keystr, strlen(keystr) + 1); +} + +/**************************************************************************** + Store a int32 value by an arbitary blob key, return 0 on success, -1 on failure. + Input is int32 in native byte order. Output in tdb is in little-endian. +****************************************************************************/ + +int tdb_store_int32_byblob(TDB_CONTEXT *tdb, const char *keystr, size_t len, int32 v) +{ + TDB_DATA key = make_tdb_data(keystr, len); + TDB_DATA data; + int32 v_store; + + SIVAL(&v_store,0,v); + data.dptr = (void *)&v_store; + data.dsize = sizeof(int32); + + return tdb_store(tdb, key, data, TDB_REPLACE); +} + +/**************************************************************************** + Store a int32 value by string key, return 0 on success, -1 on failure. + Input is int32 in native byte order. Output in tdb is in little-endian. +****************************************************************************/ + +int tdb_store_int32(TDB_CONTEXT *tdb, const char *keystr, int32 v) +{ + return tdb_store_int32_byblob(tdb, keystr, strlen(keystr) + 1, v); +} + +/**************************************************************************** + Fetch a uint32 value by a arbitrary blob key, return -1 if not found. + Output is uint32 in native byte order. +****************************************************************************/ + +BOOL tdb_fetch_uint32_byblob(TDB_CONTEXT *tdb, const char *keyval, size_t len, uint32 *value) +{ + TDB_DATA key = make_tdb_data(keyval, len); + TDB_DATA data; + + data = tdb_fetch(tdb, key); + if (!data.dptr || data.dsize != sizeof(uint32)) { + SAFE_FREE(data.dptr); + return False; + } + + *value = IVAL(data.dptr,0); + SAFE_FREE(data.dptr); + return True; +} + +/**************************************************************************** + Fetch a uint32 value by string key, return -1 if not found. + Output is uint32 in native byte order. +****************************************************************************/ + +BOOL tdb_fetch_uint32(TDB_CONTEXT *tdb, const char *keystr, uint32 *value) +{ + return tdb_fetch_uint32_byblob(tdb, keystr, strlen(keystr) + 1, value); +} + +/**************************************************************************** + Store a uint32 value by an arbitary blob key, return 0 on success, -1 on failure. + Input is uint32 in native byte order. Output in tdb is in little-endian. +****************************************************************************/ + +BOOL tdb_store_uint32_byblob(TDB_CONTEXT *tdb, const char *keystr, size_t len, uint32 value) +{ + TDB_DATA key = make_tdb_data(keystr, len); + TDB_DATA data; + uint32 v_store; + BOOL ret = True; + + SIVAL(&v_store, 0, value); + data.dptr = (void *)&v_store; + data.dsize = sizeof(uint32); + + if (tdb_store(tdb, key, data, TDB_REPLACE) == -1) + ret = False; + + return ret; +} + +/**************************************************************************** + Store a uint32 value by string key, return 0 on success, -1 on failure. + Input is uint32 in native byte order. Output in tdb is in little-endian. +****************************************************************************/ + +BOOL tdb_store_uint32(TDB_CONTEXT *tdb, const char *keystr, uint32 value) +{ + return tdb_store_uint32_byblob(tdb, keystr, strlen(keystr) + 1, value); +} +/**************************************************************************** + Store a buffer by a null terminated string key. Return 0 on success, -1 + on failure. +****************************************************************************/ + +int tdb_store_by_string(TDB_CONTEXT *tdb, const char *keystr, TDB_DATA data, int flags) +{ + TDB_DATA key = make_tdb_data(keystr, strlen(keystr)+1); + + return tdb_store(tdb, key, data, flags); +} + +/**************************************************************************** + Fetch a buffer using a null terminated string key. Don't forget to call + free() on the result dptr. +****************************************************************************/ + +TDB_DATA tdb_fetch_by_string(TDB_CONTEXT *tdb, const char *keystr) +{ + TDB_DATA key = make_tdb_data(keystr, strlen(keystr)+1); + + return tdb_fetch(tdb, key); +} + +/**************************************************************************** + Delete an entry using a null terminated string key. +****************************************************************************/ + +int tdb_delete_by_string(TDB_CONTEXT *tdb, const char *keystr) +{ + TDB_DATA key = make_tdb_data(keystr, strlen(keystr)+1); + + return tdb_delete(tdb, key); +} + +/**************************************************************************** + Atomic integer change. Returns old value. To create, set initial value in *oldval. +****************************************************************************/ + +int32 tdb_change_int32_atomic(TDB_CONTEXT *tdb, const char *keystr, int32 *oldval, int32 change_val) +{ + int32 val; + int32 ret = -1; + + if (tdb_lock_bystring(tdb, keystr,0) == -1) + return -1; + + if ((val = tdb_fetch_int32(tdb, keystr)) == -1) { + /* The lookup failed */ + if (tdb_error(tdb) != TDB_ERR_NOEXIST) { + /* but not becouse it didn't exist */ + goto err_out; + } + + /* Start with 'old' value */ + val = *oldval; + + } else { + /* It worked, set return value (oldval) to tdb data */ + *oldval = val; + } + + /* Increment value for storage and return next time */ + val += change_val; + + if (tdb_store_int32(tdb, keystr, val) == -1) + goto err_out; + + ret = 0; + + err_out: + + tdb_unlock_bystring(tdb, keystr); + return ret; +} + +/**************************************************************************** + Atomic unsigned integer change. Returns old value. To create, set initial value in *oldval. +****************************************************************************/ + +BOOL tdb_change_uint32_atomic(TDB_CONTEXT *tdb, const char *keystr, uint32 *oldval, uint32 change_val) +{ + uint32 val; + BOOL ret = False; + + if (tdb_lock_bystring(tdb, keystr,0) == -1) + return False; + + if (!tdb_fetch_uint32(tdb, keystr, &val)) { + /* It failed */ + if (tdb_error(tdb) != TDB_ERR_NOEXIST) { + /* and not becouse it didn't exist */ + goto err_out; + } + + /* Start with 'old' value */ + val = *oldval; + + } else { + /* it worked, set return value (oldval) to tdb data */ + *oldval = val; + + } + + /* get a new value to store */ + val += change_val; + + if (!tdb_store_uint32(tdb, keystr, val)) + goto err_out; + + ret = True; + + err_out: + + tdb_unlock_bystring(tdb, keystr); + return ret; +} + +/**************************************************************************** + Useful pair of routines for packing/unpacking data consisting of + integers and strings. +****************************************************************************/ + +size_t tdb_pack(char *buf, int bufsize, const char *fmt, ...) +{ + va_list ap; + uint16 w; + uint32 d; + int i; + void *p; + int len; + char *s; + char c; + char *buf0 = buf; + const char *fmt0 = fmt; + int bufsize0 = bufsize; + + va_start(ap, fmt); + + while (*fmt) { + switch ((c = *fmt++)) { + case 'w': + len = 2; + w = (uint16)va_arg(ap, int); + if (bufsize >= len) + SSVAL(buf, 0, w); + break; + case 'd': + len = 4; + d = va_arg(ap, uint32); + if (bufsize >= len) + SIVAL(buf, 0, d); + break; + case 'p': + len = 4; + p = va_arg(ap, void *); + d = p?1:0; + if (bufsize >= len) + SIVAL(buf, 0, d); + break; + case 'P': + s = va_arg(ap,char *); + w = strlen(s); + len = w + 1; + if (bufsize >= len) + memcpy(buf, s, len); + break; + case 'f': + s = va_arg(ap,char *); + w = strlen(s); + len = w + 1; + if (bufsize >= len) + memcpy(buf, s, len); + break; + case 'B': + i = va_arg(ap, int); + s = va_arg(ap, char *); + len = 4+i; + if (bufsize >= len) { + SIVAL(buf, 0, i); + memcpy(buf+4, s, i); + } + break; + default: + DEBUG(0,("Unknown tdb_pack format %c in %s\n", + c, fmt)); + len = 0; + break; + } + + buf += len; + bufsize -= len; + } + + va_end(ap); + + DEBUG(18,("tdb_pack(%s, %d) -> %d\n", + fmt0, bufsize0, (int)PTR_DIFF(buf, buf0))); + + return PTR_DIFF(buf, buf0); +} + +/**************************************************************************** + Useful pair of routines for packing/unpacking data consisting of + integers and strings. +****************************************************************************/ + +int tdb_unpack(char *buf, int bufsize, const char *fmt, ...) +{ + va_list ap; + uint16 *w; + uint32 *d; + int len; + int *i; + void **p; + char *s, **b; + char c; + char *buf0 = buf; + const char *fmt0 = fmt; + int bufsize0 = bufsize; + + va_start(ap, fmt); + + while (*fmt) { + switch ((c=*fmt++)) { + case 'w': + len = 2; + w = va_arg(ap, uint16 *); + if (bufsize < len) + goto no_space; + *w = SVAL(buf, 0); + break; + case 'd': + len = 4; + d = va_arg(ap, uint32 *); + if (bufsize < len) + goto no_space; + *d = IVAL(buf, 0); + break; + case 'p': + len = 4; + p = va_arg(ap, void **); + if (bufsize < len) + goto no_space; + *p = (void *)IVAL(buf, 0); + break; + case 'P': + s = va_arg(ap,char *); + len = strlen(buf) + 1; + if (bufsize < len || len > sizeof(pstring)) + goto no_space; + memcpy(s, buf, len); + break; + case 'f': + s = va_arg(ap,char *); + len = strlen(buf) + 1; + if (bufsize < len || len > sizeof(fstring)) + goto no_space; + memcpy(s, buf, len); + break; + case 'B': + i = va_arg(ap, int *); + b = va_arg(ap, char **); + len = 4; + if (bufsize < len) + goto no_space; + *i = IVAL(buf, 0); + if (! *i) { + *b = NULL; + break; + } + len += *i; + if (bufsize < len) + goto no_space; + *b = (char *)malloc(*i); + if (! *b) + goto no_space; + memcpy(*b, buf+4, *i); + break; + default: + DEBUG(0,("Unknown tdb_unpack format %c in %s\n", + c, fmt)); + + len = 0; + break; + } + + buf += len; + bufsize -= len; + } + + va_end(ap); + + DEBUG(18,("tdb_unpack(%s, %d) -> %d\n", + fmt0, bufsize0, (int)PTR_DIFF(buf, buf0))); + + return PTR_DIFF(buf, buf0); + + no_space: + return -1; +} + +/**************************************************************************** + Log tdb messages via DEBUG(). +****************************************************************************/ + +static void tdb_log(TDB_CONTEXT *tdb, int level, const char *format, ...) +{ + va_list ap; + char *ptr = NULL; + + va_start(ap, format); + vasprintf(&ptr, format, ap); + va_end(ap); + + if (!ptr || !*ptr) + return; + + DEBUG(level, ("tdb(%s): %s", tdb->name ? tdb->name : "unnamed", ptr)); + SAFE_FREE(ptr); +} + +/**************************************************************************** + Like tdb_open() but also setup a logging function that redirects to + the samba DEBUG() system. +****************************************************************************/ + +TDB_CONTEXT *tdb_open_log(const char *name, int hash_size, int tdb_flags, + int open_flags, mode_t mode) +{ + TDB_CONTEXT *tdb; + + if (!lp_use_mmap()) + tdb_flags |= TDB_NOMMAP; + + tdb = tdb_open_ex(name, hash_size, tdb_flags, + open_flags, mode, tdb_log); + if (!tdb) + return NULL; + + return tdb; +} + + +/**************************************************************************** + Allow tdb_delete to be used as a tdb_traversal_fn. +****************************************************************************/ + +int tdb_traverse_delete_fn(TDB_CONTEXT *the_tdb, TDB_DATA key, TDB_DATA dbuf, + void *state) +{ + return tdb_delete(the_tdb, key); +} + + + +/** + * Search across the whole tdb for keys that match the given pattern + * return the result as a list of keys + * + * @param tdb pointer to opened tdb file context + * @param pattern searching pattern used by fnmatch(3) functions + * + * @return list of keys found by looking up with given pattern + **/ +TDB_LIST_NODE *tdb_search_keys(TDB_CONTEXT *tdb, const char* pattern) +{ + TDB_DATA key, next; + TDB_LIST_NODE *list = NULL; + TDB_LIST_NODE *rec = NULL; + TDB_LIST_NODE *tmp = NULL; + + for (key = tdb_firstkey(tdb); key.dptr; key = next) { + /* duplicate key string to ensure null-termination */ + char *key_str = (char*) strndup(key.dptr, key.dsize); + if (!key_str) { + DEBUG(0, ("tdb_search_keys: strndup() failed!\n")); + smb_panic("strndup failed!\n"); + } + + DEBUG(18, ("checking %s for match to pattern %s\n", key_str, pattern)); + + next = tdb_nextkey(tdb, key); + + /* do the pattern checking */ + if (fnmatch(pattern, key_str, 0) == 0) { + rec = (TDB_LIST_NODE*) malloc(sizeof(*rec)); + ZERO_STRUCTP(rec); + + rec->node_key = key; + + DLIST_ADD_END(list, rec, tmp); + + DEBUG(18, ("checking %s matched pattern %s\n", key_str, pattern)); + } else { + free(key.dptr); + } + + /* free duplicated key string */ + free(key_str); + } + + return list; + +}; + + +/** + * Free the list returned by tdb_search_keys + * + * @param node list of results found by tdb_search_keys + **/ +void tdb_search_list_free(TDB_LIST_NODE* node) +{ + TDB_LIST_NODE *next_node; + + while (node) { + next_node = node->next; + SAFE_FREE(node); + node = next_node; + }; +}; + + |