int
tdbio_delete_record( ulong recnum )
{
TRUSTREC vr, rec;
int rc;
/* Must read the record fist, so we can drop it from the hash tables */
rc = tdbio_read_record( recnum, &rec, 0 );
if( rc )
;
else if( rec.rectype == RECTYPE_TRUST ) {
rc = drop_from_hashtable( get_trusthashrec(),
rec.r.trust.fingerprint, 20, rec.recnum );
}
if( rc )
return rc;
/* now we can chnage it to a free record */
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal( _("%s: error reading version record: %s\n"),
db_name, g10_errstr(rc) );
rec.recnum = recnum;
rec.rectype = RECTYPE_FREE;
rec.r.free.next = vr.r.ver.firstfree;
vr.r.ver.firstfree = recnum;
rc = tdbio_write_record( &rec );
if( !rc )
rc = tdbio_write_record( &vr );
return rc;
}
/****************
* Print a list of all defined owner trust value.
*/
void
export_ownertrust (ctrl_t ctrl)
{
TRUSTREC rec;
ulong recnum;
int i;
byte *p;
init_trustdb (ctrl, 0);
es_printf (_("# List of assigned trustvalues, created %s\n"
"# (Use \"gpg --import-ownertrust\" to restore them)\n"),
asctimestamp( make_timestamp() ) );
for (recnum=0; !tdbio_read_record (recnum, &rec, 0); recnum++ )
{
if (rec.rectype == RECTYPE_TRUST)
{
if (!rec.r.trust.ownertrust)
continue;
p = rec.r.trust.fingerprint;
for (i=0; i < 20; i++, p++ )
es_printf("%02X", *p );
es_printf (":%u:\n", (unsigned int)rec.r.trust.ownertrust );
}
}
}
static void
open_db()
{
TRUSTREC rec;
assert( db_fd == -1 );
db_fd = open (db_name, O_RDWR | MY_O_BINARY );
if (db_fd == -1 && (errno == EACCES
#ifdef EROFS
|| errno == EROFS
#endif
)
) {
db_fd = open (db_name, O_RDONLY | MY_O_BINARY );
if (db_fd != -1 && !opt.quiet)
log_info (_("NOTE: trustdb not writable\n"));
}
if ( db_fd == -1 )
log_fatal( _("can't open `%s': %s\n"), db_name, strerror(errno) );
register_secured_file (db_name);
/* Read the version record. */
if (tdbio_read_record (0, &rec, RECTYPE_VER ) )
log_fatal( _("%s: invalid trustdb\n"), db_name );
}
byte
tdbio_read_model(void)
{
TRUSTREC vr;
int rc;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal( _("%s: error reading version record: %s\n"),
db_name, g10_errstr(rc) );
return vr.r.ver.trust_model;
}
/****************
* Return the nextstamp value.
*/
ulong
tdbio_read_nextcheck ()
{
TRUSTREC vr;
int rc;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal( _("%s: error reading version record: %s\n"),
db_name, g10_errstr(rc) );
return vr.r.ver.nextcheck;
}
static void
open_db()
{
byte buf[10];
int n;
TRUSTREC rec;
assert( db_fd == -1 );
if (!lockhandle )
lockhandle = create_dotlock( db_name );
if (!lockhandle )
log_fatal( _("can't create lock for `%s'\n"), db_name );
#ifdef __riscos__
if (make_dotlock( lockhandle, -1 ) )
log_fatal( _("can't lock `%s'\n"), db_name );
#endif /* __riscos__ */
db_fd = open (db_name, O_RDWR | MY_O_BINARY );
if (db_fd == -1 && (errno == EACCES
#ifdef EROFS
|| errno == EROFS
#endif
)
) {
db_fd = open (db_name, O_RDONLY | MY_O_BINARY );
if (db_fd != -1)
log_info (_("NOTE: trustdb not writable\n"));
}
if ( db_fd == -1 )
log_fatal( _("can't open `%s': %s\n"), db_name, strerror(errno) );
register_secured_file (db_name);
/* check whether we need to do a version migration */
do
n = read (db_fd, buf, 5);
while (n==-1 && errno == EINTR);
if (n == 5 && !memcmp (buf, "\x01gpg\x02", 5))
{
migrate_from_v2 ();
}
/* read the version record */
if (tdbio_read_record (0, &rec, RECTYPE_VER ) )
log_fatal( _("%s: invalid trustdb\n"), db_name );
}
/*
* Open the trustdb. This may only be called if it has not yet been
* opened and after a successful call to tdbio_set_dbname. On return
* the trustdb handle (DB_FD) is guaranteed to be open.
*/
static void
open_db ()
{
TRUSTREC rec;
assert( db_fd == -1 );
#ifdef HAVE_W32CE_SYSTEM
{
DWORD prevrc = 0;
wchar_t *wname = utf8_to_wchar (db_name);
if (wname)
{
db_fd = (int)CreateFile (wname, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, 0, NULL);
xfree (wname);
}
if (db_fd == -1)
log_fatal ("can't open '%s': %d, %d\n", db_name,
(int)prevrc, (int)GetLastError ());
}
#else /*!HAVE_W32CE_SYSTEM*/
db_fd = open (db_name, O_RDWR | MY_O_BINARY );
if (db_fd == -1 && (errno == EACCES
#ifdef EROFS
|| errno == EROFS
#endif
)
) {
/* Take care of read-only trustdbs. */
db_fd = open (db_name, O_RDONLY | MY_O_BINARY );
if (db_fd != -1 && !opt.quiet)
log_info (_("Note: trustdb not writable\n"));
}
if ( db_fd == -1 )
log_fatal( _("can't open '%s': %s\n"), db_name, strerror(errno) );
#endif /*!HAVE_W32CE_SYSTEM*/
register_secured_file (db_name);
/* Read the version record. */
if (tdbio_read_record (0, &rec, RECTYPE_VER ) )
log_fatal( _("%s: invalid trustdb\n"), db_name );
}
/****************
* Return the record number of the trusthash tbl or create a new one.
*/
static ulong
get_trusthashrec(void)
{
static ulong trusthashtbl; /* record number of the trust hashtable */
if( !trusthashtbl ) {
TRUSTREC vr;
int rc;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal( _("%s: error reading version record: %s\n"),
db_name, g10_errstr(rc) );
if( !vr.r.ver.trusthashtbl )
create_hashtable( &vr, 0 );
trusthashtbl = vr.r.ver.trusthashtbl;
}
return trusthashtbl;
}
/* Return true when the stamp was actually changed. */
int
tdbio_write_nextcheck (ulong stamp)
{
TRUSTREC vr;
int rc;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal( _("%s: error reading version record: %s\n"),
db_name, g10_errstr(rc) );
if (vr.r.ver.nextcheck == stamp)
return 0;
vr.r.ver.nextcheck = stamp;
rc = tdbio_write_record( &vr );
if( rc )
log_fatal( _("%s: error writing version record: %s\n"),
db_name, g10_errstr(rc) );
return 1;
}
/* Caller must sync */
int
tdbio_update_version_record (void)
{
TRUSTREC rec;
int rc;
memset( &rec, 0, sizeof rec );
rc=tdbio_read_record( 0, &rec, RECTYPE_VER);
if(rc==0)
{
rec.r.ver.created = make_timestamp();
rec.r.ver.marginals = opt.marginals_needed;
rec.r.ver.completes = opt.completes_needed;
rec.r.ver.cert_depth = opt.max_cert_depth;
rec.r.ver.trust_model = opt.trust_model;
rc=tdbio_write_record(&rec);
}
return rc;
}
/*
* Dump the entire trustdb to FP or only the entries of one key.
*/
void
list_trustdb (ctrl_t ctrl, estream_t fp, const char *username)
{
TRUSTREC rec;
(void)username;
init_trustdb (ctrl, 0);
/* For now we ignore the user ID. */
if (1)
{
ulong recnum;
int i;
es_fprintf (fp, "TrustDB: %s\n", tdbio_get_dbname ());
for (i = 9 + strlen (tdbio_get_dbname()); i > 0; i-- )
es_fputc ('-', fp);
es_putc ('\n', fp);
for (recnum=0; !tdbio_read_record (recnum, &rec, 0); recnum++)
tdbio_dump_record (&rec, fp);
}
}
int
tdbio_db_matches_options()
{
static int yes_no = -1;
if( yes_no == -1 )
{
TRUSTREC vr;
int rc;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal( _("%s: error reading version record: %s\n"),
db_name, g10_errstr(rc) );
yes_no = vr.r.ver.marginals == opt.marginals_needed
&& vr.r.ver.completes == opt.completes_needed
&& vr.r.ver.cert_depth == opt.max_cert_depth
&& vr.r.ver.trust_model == opt.trust_model;
}
return yes_no;
}
/****************
* Lookup a record via the hashtable tablewith key/keylen and return the
* result in rec. cmp() should return if the record is the desired one.
* Returns -1 if not found, 0 if found or another errocode
*/
static int
lookup_hashtable( ulong table, const byte *key, size_t keylen,
int (*cmpfnc)(void*, const TRUSTREC *), void *cmpdata,
TRUSTREC *rec )
{
int rc;
ulong hashrec, item;
int msb;
int level=0;
hashrec = table;
next_level:
msb = key[level];
hashrec += msb / ITEMS_PER_HTBL_RECORD;
rc = tdbio_read_record( hashrec, rec, RECTYPE_HTBL );
if( rc ) {
log_error("lookup_hashtable failed: %s\n", g10_errstr(rc) );
return rc;
}
item = rec->r.htbl.item[msb % ITEMS_PER_HTBL_RECORD];
if( !item )
return -1; /* not found */
rc = tdbio_read_record( item, rec, 0 );
if( rc ) {
log_error( "hashtable read failed: %s\n", g10_errstr(rc) );
return rc;
}
if( rec->rectype == RECTYPE_HTBL ) {
hashrec = item;
level++;
if( level >= keylen ) {
log_error("hashtable has invalid indirections\n");
return G10ERR_TRUSTDB;
}
goto next_level;
}
else if( rec->rectype == RECTYPE_HLST ) {
for(;;) {
int i;
for(i=0; i < ITEMS_PER_HLST_RECORD; i++ ) {
if( rec->r.hlst.rnum[i] ) {
TRUSTREC tmp;
rc = tdbio_read_record( rec->r.hlst.rnum[i], &tmp, 0 );
if( rc ) {
log_error( "lookup_hashtable: read item failed: %s\n",
g10_errstr(rc) );
return rc;
}
if( (*cmpfnc)( cmpdata, &tmp ) ) {
*rec = tmp;
return 0;
}
}
}
if( rec->r.hlst.next ) {
rc = tdbio_read_record( rec->r.hlst.next, rec, RECTYPE_HLST );
if( rc ) {
log_error( "lookup_hashtable: read hlst failed: %s\n",
g10_errstr(rc) );
return rc;
}
}
else
return -1; /* not found */
}
}
if( (*cmpfnc)( cmpdata, rec ) )
return 0; /* really found */
return -1; /* no: not found */
}
/*
* Update a hashtable in the trustdb. TABLE gives the start of the
* table, KEY and KEYLEN are the key, NEWRECNUM is the record number
* to insert into the table.
*
* Return: 0 on success or an error code.
*/
static int
upd_hashtable (ulong table, byte *key, int keylen, ulong newrecnum)
{
TRUSTREC lastrec, rec;
ulong hashrec, item;
int msb;
int level = 0;
int rc, i;
hashrec = table;
next_level:
msb = key[level];
hashrec += msb / ITEMS_PER_HTBL_RECORD;
rc = tdbio_read_record (hashrec, &rec, RECTYPE_HTBL);
if (rc)
{
log_error ("upd_hashtable: read failed: %s\n", gpg_strerror (rc));
return rc;
}
item = rec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD];
if (!item) /* Insert a new item into the hash table. */
{
rec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD] = newrecnum;
rc = tdbio_write_record (&rec);
if (rc)
{
log_error ("upd_hashtable: write htbl failed: %s\n",
gpg_strerror (rc));
return rc;
}
}
else if (item != newrecnum) /* Must do an update. */
{
lastrec = rec;
rc = tdbio_read_record (item, &rec, 0);
if (rc)
{
log_error ("upd_hashtable: read item failed: %s\n",
gpg_strerror (rc));
return rc;
}
if (rec.rectype == RECTYPE_HTBL)
{
hashrec = item;
level++;
if (level >= keylen)
{
log_error ("hashtable has invalid indirections.\n");
return GPG_ERR_TRUSTDB;
}
goto next_level;
}
else if (rec.rectype == RECTYPE_HLST) /* Extend the list. */
{
/* Check whether the key is already in this list. */
for (;;)
{
for (i=0; i < ITEMS_PER_HLST_RECORD; i++)
{
if (rec.r.hlst.rnum[i] == newrecnum)
{
return 0; /* Okay, already in the list. */
}
}
if (rec.r.hlst.next)
{
rc = tdbio_read_record (rec.r.hlst.next, &rec, RECTYPE_HLST);
if (rc)
{
log_error ("upd_hashtable: read hlst failed: %s\n",
gpg_strerror (rc) );
return rc;
}
}
else
break; /* key is not in the list */
}
/* Find the next free entry and put it in. */
for (;;)
{
for (i=0; i < ITEMS_PER_HLST_RECORD; i++)
{
if (!rec.r.hlst.rnum[i])
{
/* Empty slot found. */
rec.r.hlst.rnum[i] = newrecnum;
rc = tdbio_write_record (&rec);
if (rc)
log_error ("upd_hashtable: write hlst failed: %s\n",
gpg_strerror (rc));
return rc; /* Done. */
}
}
if (rec.r.hlst.next)
{
/* read the next reord of the list. */
rc = tdbio_read_record (rec.r.hlst.next, &rec, RECTYPE_HLST);
if (rc)
{
log_error ("upd_hashtable: read hlst failed: %s\n",
gpg_strerror (rc));
return rc;
}
}
else
{
/* Append a new record to the list. */
rec.r.hlst.next = item = tdbio_new_recnum ();
rc = tdbio_write_record (&rec);
if (rc)
{
log_error ("upd_hashtable: write hlst failed: %s\n",
gpg_strerror (rc));
return rc;
}
memset (&rec, 0, sizeof rec);
rec.rectype = RECTYPE_HLST;
rec.recnum = item;
rec.r.hlst.rnum[0] = newrecnum;
rc = tdbio_write_record (&rec);
if (rc)
log_error ("upd_hashtable: write ext hlst failed: %s\n",
gpg_strerror (rc));
return rc; /* Done. */
}
} /* end loop over list slots */
}
else if (rec.rectype == RECTYPE_TRUST) /* Insert a list record. */
{
if (rec.recnum == newrecnum)
{
return 0;
}
item = rec.recnum; /* Save number of key record. */
memset (&rec, 0, sizeof rec);
rec.rectype = RECTYPE_HLST;
rec.recnum = tdbio_new_recnum ();
rec.r.hlst.rnum[0] = item; /* Old key record */
rec.r.hlst.rnum[1] = newrecnum; /* and new key record */
rc = tdbio_write_record (&rec);
if (rc)
{
log_error( "upd_hashtable: write new hlst failed: %s\n",
gpg_strerror (rc) );
return rc;
}
/* Update the hashtable record. */
lastrec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD] = rec.recnum;
rc = tdbio_write_record (&lastrec);
if (rc)
log_error ("upd_hashtable: update htbl failed: %s\n",
gpg_strerror (rc));
return rc; /* Ready. */
}
else
{
log_error ("hashtbl %lu: %lu/%d points to an invalid record %lu\n",
table, hashrec, (msb % ITEMS_PER_HTBL_RECORD), item);
if (opt.verbose > 1)
list_trustdb (es_stderr, NULL);
return GPG_ERR_TRUSTDB;
}
}
return 0;
}
int
tdbio_set_dbname( const char *new_dbname, int create )
{
char *fname;
static int initialized = 0;
if( !initialized ) {
atexit( cleanup );
initialized = 1;
}
if(new_dbname==NULL)
fname=make_filename(opt.homedir,"trustdb" EXTSEP_S "gpg", NULL);
else if (*new_dbname != DIRSEP_C )
{
if (strchr(new_dbname, DIRSEP_C) )
fname = make_filename (new_dbname, NULL);
else
fname = make_filename (opt.homedir, new_dbname, NULL);
}
else
fname = xstrdup (new_dbname);
if( access( fname, R_OK ) ) {
if( errno != ENOENT ) {
log_error( _("can't access `%s': %s\n"), fname, strerror(errno) );
xfree(fname);
return G10ERR_TRUSTDB;
}
if( create ) {
FILE *fp;
TRUSTREC rec;
int rc;
char *p = strrchr( fname, DIRSEP_C );
mode_t oldmask;
assert(p);
*p = 0;
if( access( fname, F_OK ) ) {
try_make_homedir( fname );
log_fatal( _("%s: directory does not exist!\n"), fname );
}
*p = DIRSEP_C;
xfree(db_name);
db_name = fname;
#ifdef __riscos__
if( !lockhandle )
lockhandle = create_dotlock( db_name );
if( !lockhandle )
log_fatal( _("can't create lock for `%s'\n"), db_name );
if( make_dotlock( lockhandle, -1 ) )
log_fatal( _("can't lock `%s'\n"), db_name );
#endif /* __riscos__ */
oldmask=umask(077);
if (is_secured_filename (fname)) {
fp = NULL;
errno = EPERM;
}
else
fp =fopen( fname, "wb" );
umask(oldmask);
if( !fp )
log_fatal( _("can't create `%s': %s\n"), fname, strerror(errno) );
fclose(fp);
db_fd = open( db_name, O_RDWR | MY_O_BINARY );
if( db_fd == -1 )
log_fatal( _("can't open `%s': %s\n"), db_name, strerror(errno) );
#ifndef __riscos__
if( !lockhandle )
lockhandle = create_dotlock( db_name );
if( !lockhandle )
log_fatal( _("can't create lock for `%s'\n"), db_name );
#endif /* !__riscos__ */
rc = create_version_record ();
if( rc )
log_fatal( _("%s: failed to create version record: %s"),
fname, g10_errstr(rc));
/* and read again to check that we are okay */
if( tdbio_read_record( 0, &rec, RECTYPE_VER ) )
log_fatal( _("%s: invalid trustdb created\n"), db_name );
if( !opt.quiet )
log_info(_("%s: trustdb created\n"), db_name);
return 0;
}
}
xfree(db_name);
db_name = fname;
return 0;
}
/****************
* create a new record and return its record number
*/
ulong
tdbio_new_recnum()
{
off_t offset;
ulong recnum;
TRUSTREC vr, rec;
int rc;
/* look for unused records */
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal( _("%s: error reading version record: %s\n"),
db_name, g10_errstr(rc) );
if( vr.r.ver.firstfree ) {
recnum = vr.r.ver.firstfree;
rc = tdbio_read_record( recnum, &rec, RECTYPE_FREE );
if( rc ) {
log_error( _("%s: error reading free record: %s\n"),
db_name, g10_errstr(rc) );
return rc;
}
/* update dir record */
vr.r.ver.firstfree = rec.r.free.next;
rc = tdbio_write_record( &vr );
if( rc ) {
log_error( _("%s: error writing dir record: %s\n"),
db_name, g10_errstr(rc) );
return rc;
}
/*zero out the new record */
memset( &rec, 0, sizeof rec );
rec.rectype = 0; /* unused record */
rec.recnum = recnum;
rc = tdbio_write_record( &rec );
if( rc )
log_fatal(_("%s: failed to zero a record: %s\n"),
db_name, g10_errstr(rc));
}
else { /* not found, append a new record */
offset = lseek( db_fd, 0, SEEK_END );
if( offset == -1 )
log_fatal("trustdb: lseek to end failed: %s\n", strerror(errno) );
recnum = offset / TRUST_RECORD_LEN;
assert(recnum); /* this is will never be the first record */
/* we must write a record, so that the next call to this function
* returns another recnum */
memset( &rec, 0, sizeof rec );
rec.rectype = 0; /* unused record */
rec.recnum = recnum;
rc = 0;
if( lseek( db_fd, recnum * TRUST_RECORD_LEN, SEEK_SET ) == -1 ) {
log_error(_("trustdb rec %lu: lseek failed: %s\n"),
recnum, strerror(errno) );
rc = G10ERR_WRITE_FILE;
}
else {
int n = write( db_fd, &rec, TRUST_RECORD_LEN);
if( n != TRUST_RECORD_LEN ) {
log_error(_("trustdb rec %lu: write failed (n=%d): %s\n"),
recnum, n, strerror(errno) );
rc = G10ERR_WRITE_FILE;
}
}
if( rc )
log_fatal(_("%s: failed to append a record: %s\n"),
db_name, g10_errstr(rc));
}
return recnum ;
}
/*
* Set the file name for the trustdb to NEW_DBNAME and if CREATE is
* true create that file. If NEW_DBNAME is NULL a default name is
* used, if the it does not contain a path component separator ('/')
* the global GnuPG home directory is used.
*
* Returns: 0 on success or an error code.
*
* On the first call this function registers an atexit handler.
*
*/
int
tdbio_set_dbname (const char *new_dbname, int create, int *r_nofile)
{
char *fname, *p;
struct stat statbuf;
static int initialized = 0;
int save_slash;
if (!initialized)
{
atexit (cleanup);
initialized = 1;
}
*r_nofile = 0;
if (!new_dbname)
{
fname = make_filename (opt.homedir, "trustdb" EXTSEP_S GPGEXT_GPG, NULL);
}
else if (*new_dbname != DIRSEP_C )
{
if (strchr (new_dbname, DIRSEP_C))
fname = make_filename (new_dbname, NULL);
else
fname = make_filename (opt.homedir, new_dbname, NULL);
}
else
{
fname = xstrdup (new_dbname);
}
xfree (db_name);
db_name = fname;
/* Quick check for (likely) case where there already is a
* trustdb.gpg. This check is not required in theory, but it helps
* in practice avoiding costly operations of preparing and taking
* the lock. */
if (!stat (fname, &statbuf) && statbuf.st_size > 0)
{
/* OK, we have the valid trustdb.gpg already. */
return 0;
}
else if (!create)
{
*r_nofile = 1;
return 0;
}
/* Here comes: No valid trustdb.gpg AND CREATE==1 */
/*
* Make sure the directory exists. This should be done before
* acquiring the lock, which assumes the existence of the directory.
*/
p = strrchr (fname, DIRSEP_C);
#if HAVE_W32_SYSTEM
{
/* Windows may either have a slash or a backslash. Take
care of it. */
char *pp = strrchr (fname, '/');
if (!p || pp > p)
p = pp;
}
#endif /*HAVE_W32_SYSTEM*/
assert (p);
save_slash = *p;
*p = 0;
if (access (fname, F_OK))
{
try_make_homedir (fname);
if (access (fname, F_OK))
log_fatal (_("%s: directory does not exist!\n"), fname);
}
*p = save_slash;
take_write_lock ();
if (access (fname, R_OK))
{
FILE *fp;
TRUSTREC rec;
int rc;
mode_t oldmask;
#ifdef HAVE_W32CE_SYSTEM
/* We know how the cegcc implementation of access works ;-). */
if (GetLastError () == ERROR_FILE_NOT_FOUND)
gpg_err_set_errno (ENOENT);
else
gpg_err_set_errno (EIO);
#endif /*HAVE_W32CE_SYSTEM*/
if (errno != ENOENT)
log_fatal ( _("can't access '%s': %s\n"), fname, strerror (errno));
oldmask = umask (077);
if (is_secured_filename (fname))
{
fp = NULL;
gpg_err_set_errno (EPERM);
}
else
fp = fopen (fname, "wb");
umask(oldmask);
if (!fp)
log_fatal (_("can't create '%s': %s\n"), fname, strerror (errno));
fclose (fp);
db_fd = open (db_name, O_RDWR | MY_O_BINARY);
if (db_fd == -1)
log_fatal (_("can't open '%s': %s\n"), db_name, strerror (errno));
rc = create_version_record ();
if (rc)
log_fatal (_("%s: failed to create version record: %s"),
fname, gpg_strerror (rc));
/* Read again to check that we are okay. */
if (tdbio_read_record (0, &rec, RECTYPE_VER))
log_fatal (_("%s: invalid trustdb created\n"), db_name);
if (!opt.quiet)
log_info (_("%s: trustdb created\n"), db_name);
}
release_write_lock ();
return 0;
}
/****************
* Update a hashtable.
* table gives the start of the table, key and keylen is the key,
* newrecnum is the record number to insert.
*/
static int
upd_hashtable( ulong table, byte *key, int keylen, ulong newrecnum )
{
TRUSTREC lastrec, rec;
ulong hashrec, item;
int msb;
int level=0;
int rc, i;
hashrec = table;
next_level:
msb = key[level];
hashrec += msb / ITEMS_PER_HTBL_RECORD;
rc = tdbio_read_record( hashrec, &rec, RECTYPE_HTBL );
if( rc ) {
log_error("upd_hashtable: read failed: %s\n", g10_errstr(rc) );
return rc;
}
item = rec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD];
if( !item ) { /* insert a new item into the hash table */
rec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD] = newrecnum;
rc = tdbio_write_record( &rec );
if( rc ) {
log_error("upd_hashtable: write htbl failed: %s\n",
g10_errstr(rc) );
return rc;
}
}
else if( item != newrecnum ) { /* must do an update */
lastrec = rec;
rc = tdbio_read_record( item, &rec, 0 );
if( rc ) {
log_error( "upd_hashtable: read item failed: %s\n",
g10_errstr(rc) );
return rc;
}
if( rec.rectype == RECTYPE_HTBL ) {
hashrec = item;
level++;
if( level >= keylen ) {
log_error( "hashtable has invalid indirections.\n");
return G10ERR_TRUSTDB;
}
goto next_level;
}
else if( rec.rectype == RECTYPE_HLST ) { /* extend list */
/* see whether the key is already in this list */
for(;;) {
for(i=0; i < ITEMS_PER_HLST_RECORD; i++ ) {
if( rec.r.hlst.rnum[i] == newrecnum ) {
return 0; /* okay, already in the list */
}
}
if( rec.r.hlst.next ) {
rc = tdbio_read_record( rec.r.hlst.next,
&rec, RECTYPE_HLST);
if( rc ) {
log_error( "upd_hashtable: read hlst failed: %s\n",
g10_errstr(rc) );
return rc;
}
}
else
break; /* not there */
}
/* find the next free entry and put it in */
for(;;) {
for(i=0; i < ITEMS_PER_HLST_RECORD; i++ ) {
if( !rec.r.hlst.rnum[i] ) {
rec.r.hlst.rnum[i] = newrecnum;
rc = tdbio_write_record( &rec );
if( rc )
log_error( "upd_hashtable: write hlst failed: %s\n",
g10_errstr(rc) );
return rc; /* done */
}
}
if( rec.r.hlst.next ) {
rc = tdbio_read_record( rec.r.hlst.next,
&rec, RECTYPE_HLST );
if( rc ) {
log_error( "upd_hashtable: read hlst failed: %s\n",
g10_errstr(rc) );
return rc;
}
}
else { /* add a new list record */
rec.r.hlst.next = item = tdbio_new_recnum();
rc = tdbio_write_record( &rec );
if( rc ) {
log_error( "upd_hashtable: write hlst failed: %s\n",
g10_errstr(rc) );
return rc;
}
memset( &rec, 0, sizeof rec );
rec.rectype = RECTYPE_HLST;
rec.recnum = item;
rec.r.hlst.rnum[0] = newrecnum;
rc = tdbio_write_record( &rec );
if( rc )
log_error( "upd_hashtable: write ext hlst failed: %s\n",
g10_errstr(rc) );
return rc; /* done */
}
} /* end loop over hlst slots */
}
else if( rec.rectype == RECTYPE_TRUST ) { /* insert a list record */
if( rec.recnum == newrecnum ) {
return 0;
}
item = rec.recnum; /* save number of key record */
memset( &rec, 0, sizeof rec );
rec.rectype = RECTYPE_HLST;
rec.recnum = tdbio_new_recnum();
rec.r.hlst.rnum[0] = item; /* old keyrecord */
rec.r.hlst.rnum[1] = newrecnum; /* and new one */
rc = tdbio_write_record( &rec );
if( rc ) {
log_error( "upd_hashtable: write new hlst failed: %s\n",
g10_errstr(rc) );
return rc;
}
/* update the hashtable record */
lastrec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD] = rec.recnum;
rc = tdbio_write_record( &lastrec );
if( rc )
log_error( "upd_hashtable: update htbl failed: %s\n",
g10_errstr(rc) );
return rc; /* ready */
}
else {
log_error( "hashtbl %lu: %lu/%d points to an invalid record %lu\n",
table, hashrec, (msb % ITEMS_PER_HTBL_RECORD), item);
list_trustdb(NULL);
return G10ERR_TRUSTDB;
}
}
return 0;
}
int
tdbio_set_dbname( const char *new_dbname, int create, int *r_nofile)
{
char *fname;
struct stat statbuf;
static int initialized = 0;
if( !initialized ) {
atexit( cleanup );
initialized = 1;
}
*r_nofile = 0;
if(new_dbname==NULL)
fname=make_filename(opt.homedir,"trustdb" EXTSEP_S "gpg", NULL);
else if (*new_dbname != DIRSEP_C )
{
if (strchr(new_dbname, DIRSEP_C) )
fname = make_filename (new_dbname, NULL);
else
fname = make_filename (opt.homedir, new_dbname, NULL);
}
else
fname = xstrdup (new_dbname);
xfree (db_name);
db_name = fname;
/*
* Quick check for (likely) case where there is trustdb.gpg
* already. This check is not required in theory, but it helps in
* practice, avoiding costly operations of preparing and taking
* the lock.
*/
if (stat (fname, &statbuf) == 0 && statbuf.st_size > 0)
/* OK, we have the valid trustdb.gpg already. */
return 0;
take_write_lock ();
if( access( fname, R_OK ) ) {
if( errno != ENOENT )
log_fatal( _("can't access `%s': %s\n"), fname, strerror(errno) );
if (!create)
*r_nofile = 1;
else {
FILE *fp;
TRUSTREC rec;
int rc;
char *p = strrchr( fname, DIRSEP_C );
mode_t oldmask;
int save_slash;
#if HAVE_W32_SYSTEM
{
/* Windows may either have a slash or a backslash. Take
care of it. */
char *pp = strrchr (fname, '/');
if (!p || pp > p)
p = pp;
}
#endif /*HAVE_W32_SYSTEM*/
assert (p);
save_slash = *p;
*p = 0;
if( access( fname, F_OK ) ) {
try_make_homedir( fname );
if (access (fname, F_OK ))
log_fatal (_("%s: directory does not exist!\n"), fname);
}
*p = save_slash;
oldmask=umask(077);
if (is_secured_filename (fname)) {
fp = NULL;
errno = EPERM;
}
else
fp =fopen( fname, "wb" );
umask(oldmask);
if( !fp )
log_fatal( _("can't create `%s': %s\n"), fname, strerror(errno) );
fclose(fp);
db_fd = open( db_name, O_RDWR | MY_O_BINARY );
if( db_fd == -1 )
log_fatal( _("can't open `%s': %s\n"), db_name, strerror(errno) );
rc = create_version_record ();
if( rc )
log_fatal( _("%s: failed to create version record: %s"),
fname, g10_errstr(rc));
/* and read again to check that we are okay */
if( tdbio_read_record( 0, &rec, RECTYPE_VER ) )
log_fatal( _("%s: invalid trustdb created\n"), db_name );
if( !opt.quiet )
log_info(_("%s: trustdb created\n"), db_name);
}
}
release_write_lock ();
return 0;
}
/****************
* Drop an entry from a hashtable
* table gives the start of the table, key and keylen is the key,
*/
static int
drop_from_hashtable( ulong table, byte *key, int keylen, ulong recnum )
{
TRUSTREC rec;
ulong hashrec, item;
int msb;
int level=0;
int rc, i;
hashrec = table;
next_level:
msb = key[level];
hashrec += msb / ITEMS_PER_HTBL_RECORD;
rc = tdbio_read_record( hashrec, &rec, RECTYPE_HTBL );
if( rc ) {
log_error("drop_from_hashtable: read failed: %s\n",
g10_errstr(rc) );
return rc;
}
item = rec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD];
if( !item ) /* not found - forget about it */
return 0;
if( item == recnum ) { /* tables points direct to the record */
rec.r.htbl.item[msb % ITEMS_PER_HTBL_RECORD] = 0;
rc = tdbio_write_record( &rec );
if( rc )
log_error("drop_from_hashtable: write htbl failed: %s\n",
g10_errstr(rc) );
return rc;
}
rc = tdbio_read_record( item, &rec, 0 );
if( rc ) {
log_error( "drop_from_hashtable: read item failed: %s\n",
g10_errstr(rc) );
return rc;
}
if( rec.rectype == RECTYPE_HTBL ) {
hashrec = item;
level++;
if( level >= keylen ) {
log_error( "hashtable has invalid indirections.\n");
return G10ERR_TRUSTDB;
}
goto next_level;
}
if( rec.rectype == RECTYPE_HLST ) {
for(;;) {
for(i=0; i < ITEMS_PER_HLST_RECORD; i++ ) {
if( rec.r.hlst.rnum[i] == recnum ) {
rec.r.hlst.rnum[i] = 0; /* drop */
rc = tdbio_write_record( &rec );
if( rc )
log_error("drop_from_hashtable: write htbl failed: %s\n",
g10_errstr(rc) );
return rc;
}
}
if( rec.r.hlst.next ) {
rc = tdbio_read_record( rec.r.hlst.next,
&rec, RECTYPE_HLST);
if( rc ) {
log_error( "drop_from_hashtable: read hlst failed: %s\n",
g10_errstr(rc) );
return rc;
}
}
else
return 0; /* key not in table */
}
}
log_error( "hashtbl %lu: %lu/%d points to wrong record %lu\n",
table, hashrec, (msb % ITEMS_PER_HTBL_RECORD), item);
return G10ERR_TRUSTDB;
}
/*
* Create a new record and return its record number.
*/
ulong
tdbio_new_recnum ()
{
off_t offset;
ulong recnum;
TRUSTREC vr, rec;
int rc;
/* Look for unused records. */
rc = tdbio_read_record (0, &vr, RECTYPE_VER);
if (rc)
log_fatal( _("%s: error reading version record: %s\n"),
db_name, gpg_strerror (rc));
if (vr.r.ver.firstfree)
{
recnum = vr.r.ver.firstfree;
rc = tdbio_read_record (recnum, &rec, RECTYPE_FREE);
if (rc)
{
log_error (_("%s: error reading free record: %s\n"),
db_name, gpg_strerror (rc));
return rc;
}
/* Update dir record. */
vr.r.ver.firstfree = rec.r.free.next;
rc = tdbio_write_record (&vr);
if (rc)
{
log_error (_("%s: error writing dir record: %s\n"),
db_name, gpg_strerror (rc));
return rc;
}
/* Zero out the new record. */
memset (&rec, 0, sizeof rec);
rec.rectype = 0; /* Mark as unused record (actually already done
my the memset). */
rec.recnum = recnum;
rc = tdbio_write_record (&rec);
if (rc)
log_fatal (_("%s: failed to zero a record: %s\n"),
db_name, gpg_strerror (rc));
}
else /* Not found - append a new record. */
{
offset = lseek (db_fd, 0, SEEK_END);
if (offset == (off_t)(-1))
log_fatal ("trustdb: lseek to end failed: %s\n", strerror (errno));
recnum = offset / TRUST_RECORD_LEN;
assert (recnum); /* this is will never be the first record */
/* We must write a record, so that the next call to this
* function returns another recnum. */
memset (&rec, 0, sizeof rec);
rec.rectype = 0; /* unused record */
rec.recnum = recnum;
rc = 0;
if (lseek( db_fd, recnum * TRUST_RECORD_LEN, SEEK_SET) == -1)
{
rc = gpg_error_from_syserror ();
log_error (_("trustdb rec %lu: lseek failed: %s\n"),
recnum, strerror (errno));
}
else
{
int n;
n = write (db_fd, &rec, TRUST_RECORD_LEN);
if (n != TRUST_RECORD_LEN)
{
rc = gpg_error_from_syserror ();
log_error (_("trustdb rec %lu: write failed (n=%d): %s\n"),
recnum, n, strerror (errno));
}
}
if (rc)
log_fatal (_("%s: failed to append a record: %s\n"),
db_name, gpg_strerror (rc));
}
return recnum ;
}
