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-rw-r--r--source3/lib/util_tdb.c444
1 files changed, 444 insertions, 0 deletions
diff --git a/source3/lib/util_tdb.c b/source3/lib/util_tdb.c
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--- /dev/null
+++ b/source3/lib/util_tdb.c
@@ -0,0 +1,444 @@
+/*
+ Unix SMB/CIFS implementation.
+ tdb utility functions
+ Copyright (C) Andrew Tridgell 1992-1998
+ Copyright (C) Rafal Szczesniak 2002
+ Copyright (C) Michael Adam 2007
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "util_tdb.h"
+#include "cbuf.h"
+
+#undef malloc
+#undef realloc
+#undef calloc
+#undef strdup
+
+/****************************************************************************
+ Useful pair of routines for packing/unpacking data consisting of
+ integers and strings.
+****************************************************************************/
+
+static size_t tdb_pack_va(uint8_t *buf, int bufsize, const char *fmt, va_list ap)
+{
+ uint8_t bt;
+ uint16_t w;
+ uint32_t d;
+ int i;
+ void *p;
+ int len = 0;
+ char *s;
+ char c;
+ const char *fmt0 = fmt;
+ int bufsize0 = bufsize;
+ size_t to_write = 0;
+ while (*fmt) {
+ switch ((c = *fmt++)) {
+ case 'b': /* unsigned 8-bit integer */
+ len = 1;
+ bt = (uint8_t)va_arg(ap, int);
+ if (bufsize && bufsize >= len)
+ SSVAL(buf, 0, bt);
+ break;
+ case 'w': /* unsigned 16-bit integer */
+ len = 2;
+ w = (uint16_t)va_arg(ap, int);
+ if (bufsize && bufsize >= len)
+ SSVAL(buf, 0, w);
+ break;
+ case 'd': /* signed 32-bit integer (standard int in most systems) */
+ len = 4;
+ d = va_arg(ap, uint32_t);
+ if (bufsize && bufsize >= len)
+ SIVAL(buf, 0, d);
+ break;
+ case 'p': /* pointer */
+ len = 4;
+ p = va_arg(ap, void *);
+ d = p?1:0;
+ if (bufsize && bufsize >= len)
+ SIVAL(buf, 0, d);
+ break;
+ case 'P': /* null-terminated string */
+ case 'f': /* null-terminated string */
+ s = va_arg(ap,char *);
+ if (s == NULL) {
+ smb_panic("Invalid argument");
+ }
+ w = strlen(s);
+ len = w + 1;
+ if (bufsize && bufsize >= len)
+ memcpy(buf, s, len);
+ break;
+ case 'B': /* fixed-length string */
+ i = va_arg(ap, int);
+ s = va_arg(ap, char *);
+ len = 4+i;
+ if (bufsize && bufsize >= len) {
+ SIVAL(buf, 0, i);
+ if (s != NULL) {
+ memcpy(buf+4, s, i);
+ }
+ }
+ break;
+ default:
+ DEBUG(0,("Unknown tdb_pack format %c in %s\n",
+ c, fmt));
+ len = 0;
+ break;
+ }
+
+ to_write += len;
+ if (bufsize > 0) {
+ bufsize -= len;
+ buf += len;
+ }
+ if (bufsize < 0)
+ bufsize = 0;
+ }
+
+ DEBUG(18,("tdb_pack_va(%s, %d) -> %d\n",
+ fmt0, bufsize0, (int)to_write));
+
+ return to_write;
+}
+
+size_t tdb_pack(uint8_t *buf, int bufsize, const char *fmt, ...)
+{
+ va_list ap;
+ size_t result;
+
+ va_start(ap, fmt);
+ result = tdb_pack_va(buf, bufsize, fmt, ap);
+ va_end(ap);
+ return result;
+}
+
+/****************************************************************************
+ Useful pair of routines for packing/unpacking data consisting of
+ integers and strings.
+****************************************************************************/
+
+int tdb_unpack(const uint8_t *buf, int in_bufsize, const char *fmt, ...)
+{
+ va_list ap;
+ uint8_t *bt;
+ uint16_t *w;
+ uint32_t *d;
+ size_t bufsize = in_bufsize;
+ size_t len;
+ uint32_t *i;
+ void **p;
+ char *s, **b, **ps;
+ char c;
+ const uint8_t *buf0 = buf;
+ const char *fmt0 = fmt;
+
+ va_start(ap, fmt);
+
+ while (*fmt) {
+ switch ((c=*fmt++)) {
+ case 'b': /* unsigned 8-bit integer */
+ len = 1;
+ bt = va_arg(ap, uint8_t *);
+ if (bufsize < len)
+ goto no_space;
+ *bt = SVAL(buf, 0);
+ break;
+ case 'w': /* unsigned 16-bit integer */
+ len = 2;
+ w = va_arg(ap, uint16_t *);
+ if (bufsize < len)
+ goto no_space;
+ *w = SVAL(buf, 0);
+ break;
+ case 'd': /* unsigned 32-bit integer (standard int in most systems) */
+ len = 4;
+ d = va_arg(ap, uint32_t *);
+ if (bufsize < len)
+ goto no_space;
+ *d = IVAL(buf, 0);
+ break;
+ case 'p': /* pointer */
+ len = 4;
+ p = va_arg(ap, void **);
+ if (bufsize < len)
+ goto no_space;
+ /*
+ * This isn't a real pointer - only a token (1 or 0)
+ * to mark the fact a pointer is present.
+ */
+
+ *p = (void *)(IVAL(buf, 0) ? (void *)1 : NULL);
+ break;
+ case 'P': /* null-terminated string */
+ /* Return malloc'ed string. */
+ ps = va_arg(ap,char **);
+ len = strnlen((const char *)buf, bufsize) + 1;
+ if (bufsize < len)
+ goto no_space;
+ if (ps != NULL) {
+ *ps = SMB_STRDUP((const char *)buf);
+ if (*ps == NULL) {
+ goto no_space;
+ }
+ }
+ break;
+ case 'f': /* null-terminated string */
+ s = va_arg(ap,char *);
+ len = strnlen((const char *)buf, bufsize) + 1;
+ if (bufsize < len || len > sizeof(fstring))
+ goto no_space;
+ if (s != NULL) {
+ memcpy(s, buf, len);
+ }
+ break;
+ case 'B': /* fixed-length string */
+ i = va_arg(ap, uint32_t *);
+ 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 (len < *i) {
+ goto no_space;
+ }
+ if (bufsize < len)
+ goto no_space;
+ if (b != NULL) {
+ *b = (char *)SMB_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, in_bufsize, (int)PTR_DIFF(buf, buf0)));
+
+ return PTR_DIFF(buf, buf0);
+
+ no_space:
+ va_end(ap);
+ return -1;
+}
+
+
+/****************************************************************************
+ Log tdb messages via DEBUG().
+****************************************************************************/
+
+static void tdb_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
+ const char *format, ...) PRINTF_ATTRIBUTE(3,4);
+
+static void tdb_log(TDB_CONTEXT *tdb, enum tdb_debug_level level, const char *format, ...)
+{
+ va_list ap;
+ char *ptr = NULL;
+ int ret;
+
+ va_start(ap, format);
+ ret = vasprintf(&ptr, format, ap);
+ va_end(ap);
+
+ if ((ret == -1) || !*ptr)
+ return;
+
+ DEBUG((int)level, ("tdb(%s): %s", tdb_name(tdb) ? tdb_name(tdb) : "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;
+ struct tdb_logging_context log_ctx = { .log_fn = tdb_log };
+
+ if (!lp_use_mmap())
+ tdb_flags |= TDB_NOMMAP;
+
+ if ((hash_size == 0) && (name != NULL)) {
+ const char *base = strrchr_m(name, '/');
+ if (base != NULL) {
+ base += 1;
+ }
+ else {
+ base = name;
+ }
+ hash_size = lp_parm_int(-1, "tdb_hashsize", base, 0);
+ }
+
+ tdb = tdb_open_ex(name, hash_size, tdb_flags,
+ open_flags, mode, &log_ctx, NULL);
+ if (!tdb)
+ return NULL;
+
+ return tdb;
+}
+
+int tdb_data_cmp(TDB_DATA t1, TDB_DATA t2)
+{
+ int ret;
+ if (t1.dptr == NULL && t2.dptr != NULL) {
+ return -1;
+ }
+ if (t1.dptr != NULL && t2.dptr == NULL) {
+ return 1;
+ }
+ if (t1.dptr == t2.dptr) {
+ return t1.dsize - t2.dsize;
+ }
+ ret = memcmp(t1.dptr, t2.dptr, MIN(t1.dsize, t2.dsize));
+ if (ret == 0) {
+ return t1.dsize - t2.dsize;
+ }
+ return ret;
+}
+
+char *tdb_data_string(TALLOC_CTX *mem_ctx, TDB_DATA d)
+{
+ int len;
+ char *ret = NULL;
+ cbuf *ost = cbuf_new(mem_ctx);
+
+ if (ost == NULL) {
+ return NULL;
+ }
+
+ len = cbuf_printf(ost, "%zu:", d.dsize);
+ if (len == -1) {
+ goto done;
+ }
+
+ if (d.dptr == NULL) {
+ len = cbuf_puts(ost, "<NULL>", -1);
+ } else {
+ len = cbuf_print_quoted(ost, (const char*)d.dptr, d.dsize);
+ }
+ if (len == -1) {
+ goto done;
+ }
+
+ cbuf_swapptr(ost, &ret, 0);
+ talloc_steal(mem_ctx, ret);
+
+done:
+ talloc_free(ost);
+ return ret;
+}
+
+static sig_atomic_t gotalarm;
+
+/***************************************************************
+ Signal function to tell us we timed out.
+****************************************************************/
+
+static void gotalarm_sig(int signum)
+{
+ gotalarm = 1;
+}
+
+/****************************************************************************
+ 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;
+
+ if (timeout) {
+ CatchSignal(SIGALRM, gotalarm_sig);
+ tdb_setalarm_sigptr(tdb, &gotalarm);
+ alarm(timeout);
+ }
+
+ if (rw_type == F_RDLCK)
+ ret = tdb_chainlock_read(tdb, key);
+ else
+ ret = tdb_chainlock(tdb, key);
+
+ if (timeout) {
+ alarm(0);
+ tdb_setalarm_sigptr(tdb, NULL);
+ CatchSignal(SIGALRM, SIG_IGN);
+ if (gotalarm && (ret != 0)) {
+ DEBUG(0,("tdb_chainlock_with_timeout_internal: alarm (%u) timed out for key %s in tdb %s\n",
+ timeout, key.dptr, tdb_name(tdb)));
+ /* 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 == 0 ? 0 : -1;
+}
+
+/****************************************************************************
+ Write lock a chain. Return non-zero 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);
+}
+
+int tdb_lock_bystring_with_timeout(TDB_CONTEXT *tdb, const char *keyval,
+ int timeout)
+{
+ TDB_DATA key = string_term_tdb_data(keyval);
+
+ return tdb_chainlock_with_timeout(tdb, key, timeout);
+}
+
+/****************************************************************************
+ Read lock a chain by string. Return non-zero if timeout or lock failed.
+****************************************************************************/
+
+int tdb_read_lock_bystring_with_timeout(TDB_CONTEXT *tdb, const char *keyval, unsigned int timeout)
+{
+ TDB_DATA key = string_term_tdb_data(keyval);
+
+ return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_RDLCK);
+}
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