Page MenuHome GnuPG
Files F27670640

tdbio.c
No OneTemporary
Actions

tdbio.c
View Options

/* tdbio.c
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG 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.
*
* GNUPG 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "errors.h"
#include "iobuf.h"
#include "memory.h"
#include "util.h"
#include "options.h"
#include "main.h"
#include "i18n.h"
#include "trustdb.h"
#include "tdbio.h"
/* a type used to pass infomation to cmp_krec_fpr */
struct cmp_krec_fpr_struct {
int pubkey_algo;
const char *fpr;
int fprlen;
};
/* a type used to pass infomation to cmp_sdir */
struct cmp_sdir_struct {
int pubkey_algo;
u32 keyid[2];
};
static char *db_name;
static int db_fd = -1;
static void open_db(void);
int
tdbio_set_dbname( const char *new_dbname, int create )
{
char *fname;
fname = new_dbname? m_strdup( new_dbname )
: make_filename(opt.homedir, "trustdb.gpg", NULL );
if( access( fname, R_OK ) ) {
if( errno != ENOENT ) {
log_error_f( fname, _("can't access: %s\n"), strerror(errno) );
m_free(fname);
return G10ERR_TRUSTDB;
}
if( create ) {
FILE *fp;
TRUSTREC rec;
int rc;
char *p = strrchr( fname, '/' );
assert(p);
*p = 0;
if( access( fname, F_OK ) ) {
if( strlen(fname) >= 7
&& !strcmp(fname+strlen(fname)-7, "/.gnupg" ) ) {
#if __MINGW32__
if( mkdir( fname ) )
#else
if( mkdir( fname, S_IRUSR|S_IWUSR|S_IXUSR ) )
#endif
log_fatal_f( fname, _("can't create directory: %s\n"),
strerror(errno) );
}
else
log_fatal_f(fname, _("directory does not exist!\n") );
}
*p = '/';
fp =fopen( fname, "wb" );
if( !fp )
log_fatal_f( fname, _("can't create: %s\n"), strerror(errno) );
fclose(fp);
m_free(db_name);
db_name = fname;
#ifdef __MINGW32__
db_fd = open( db_name, O_RDWR | O_BINARY );
#else
db_fd = open( db_name, O_RDWR );
#endif
if( db_fd == -1 )
log_fatal_f( db_name, _("can't open: %s\n"), strerror(errno) );
memset( &rec, 0, sizeof rec );
rec.r.ver.version = 2;
rec.r.ver.created = make_timestamp();
rec.rectype = RECTYPE_VER;
rec.recnum = 0;
rc = tdbio_write_record( &rec );
if( rc )
log_fatal_f( fname, _("failed to create version record: %s"),
g10_errstr(rc));
/* and read again to check that we are okay */
if( tdbio_read_record( 0, &rec, RECTYPE_VER ) )
log_fatal_f( db_name, "invalid trust-db created\n" );
return 0;
}
}
m_free(db_name);
db_name = fname;
return 0;
}
const char *
tdbio_get_dbname()
{
return db_name;
}
static void
open_db()
{
TRUSTREC rec;
assert( db_fd == -1 );
#ifdef __MINGW32__
db_fd = open( db_name, O_RDWR | O_BINARY );
#else
db_fd = open( db_name, O_RDWR );
#endif
if( db_fd == -1 )
log_fatal_f( db_name, _("can't open: %s\n"), strerror(errno) );
if( tdbio_read_record( 0, &rec, RECTYPE_VER ) )
log_fatal_f( db_name, _("invalid trust-db\n") );
/* fixme: check ->locked and other stuff */
}
/****************
* Make a hashtable: type 0 = key hash, 1 = sdir hash
*/
static void
create_hashtable( TRUSTREC *vr, int type )
{
TRUSTREC rec;
off_t offset;
ulong recnum;
int i, n, rc;
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 */
if( !type )
vr->r.ver.keyhashtbl = recnum;
else
vr->r.ver.sdirhashtbl = recnum;
/* Now write the records */
n = (256+ITEMS_PER_HTBL_RECORD-1) / ITEMS_PER_HTBL_RECORD;
for(i=0; i < n; i++, recnum++ ) {
memset( &rec, 0, sizeof rec );
rec.rectype = RECTYPE_HTBL; /* free record */
rec.recnum = recnum;
rc = tdbio_write_record( &rec );
if( rc )
log_fatal_f(db_name,_("failed to create hashtable: %s\n"),
g10_errstr(rc));
}
/* update the version record */
rc = tdbio_write_record( vr );
if( rc )
log_fatal_f( db_name, _("error updating version record: %s\n"),
g10_errstr(rc));
}
/****************
* Return the record number of the keyhash tbl or create a new one.
*/
static ulong
get_keyhashrec()
{
static ulong keyhashtbl; /* record number of the key hashtable */
TRUSTREC vr;
int rc;
if( keyhashtbl )
return keyhashtbl;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal_f( db_name, _("error reading version record: %s\n"),
g10_errstr(rc) );
if( !vr.r.ver.keyhashtbl )
create_hashtable( &vr, 0 );
return vr.r.ver.keyhashtbl;
}
/****************
* Return the record number of the shadow direcory hash table
* or create a new one.
*/
static ulong
get_sdirhashrec()
{
static ulong sdirhashtbl; /* record number of the hashtable */
TRUSTREC vr;
int rc;
if( sdirhashtbl )
return sdirhashtbl;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal_f( db_name, _("error reading version record: %s\n"),
g10_errstr(rc) );
if( !vr.r.ver.sdirhashtbl )
create_hashtable( &vr, 1 );
return vr.r.ver.sdirhashtbl;
}
/****************
* 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( db_name, "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( db_name, "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( db_name, "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( db_name, "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( db_name,
"scan keyhashtbl 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( db_name,
"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( db_name,
"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( db_name,
"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( db_name,
"upd_hashtable: write ext hlst failed: %s\n",
g10_errstr(rc) );
return rc; /* done */
}
} /* end loop over hlst slots */
}
else if( rec.rectype == RECTYPE_KEY
|| rec.rectype == RECTYPE_SDIR ) { /* 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( db_name,
"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( db_name, "upd_hashtable: update htbl failed: %s\n",
g10_errstr(rc) );
return rc; /* ready */
}
else {
log_error( db_name, "hashtbl %lu points to an invalid record\n",
item);
return G10ERR_TRUSTDB;
}
}
return 0;
}
/****************
* 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( db_name, "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( db_name, "hashtable read failed: %s\n", g10_errstr(rc) );
return rc;
}
if( rec->rectype == RECTYPE_HTBL ) {
hashrec = item;
level++;
if( level >= keylen ) {
log_error( db_name, "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 the key hashtbl or create the table if it does not exist
*/
static int
update_keyhashtbl( TRUSTREC *kr )
{
return upd_hashtable( get_keyhashrec(),
kr->r.key.fingerprint,
kr->r.key.fingerprint_len, kr->recnum );
}
/****************
* Update the shadow dir hashtbl or create the table if it does not exist
*/
static int
update_sdirhashtbl( TRUSTREC *sr )
{
byte key[8];
u32tobuf( key , sr->r.sdir.keyid[0] );
u32tobuf( key+4 , sr->r.sdir.keyid[1] );
return upd_hashtable( get_sdirhashrec(), key, 8, sr->recnum );
}
void
tdbio_dump_record( TRUSTREC *rec, FILE *fp )
{
int i;
ulong rnum = rec->recnum;
byte *p;
fprintf(fp, "rec %5lu, ", rnum );
switch( rec->rectype ) {
case 0: fprintf(fp, "blank\n");
break;
case RECTYPE_VER: fprintf(fp, "version, kd=%lu, sd=%lu, free=%lu\n",
rec->r.ver.keyhashtbl, rec->r.ver.sdirhashtbl,
rec->r.ver.firstfree );
break;
case RECTYPE_FREE: fprintf(fp, "free, next=%lu\n", rec->r.free.next );
break;
case RECTYPE_DIR:
fprintf(fp, "dir %lu, keys=%lu, uids=%lu, cach=%lu, ot=%02x",
rec->r.dir.lid,
rec->r.dir.keylist,
rec->r.dir.uidlist,
rec->r.dir.cacherec,
rec->r.dir.ownertrust );
if( rec->r.dir.dirflags & DIRF_ERROR )
fputs(", error", fp );
if( rec->r.dir.dirflags & DIRF_CHECKED )
fputs(", checked", fp );
if( rec->r.dir.dirflags & DIRF_REVOKED )
fputs(", revoked", fp );
if( rec->r.dir.dirflags & DIRF_MISKEY )
fputs(", miskey", fp );
putc('\n', fp);
break;
case RECTYPE_KEY:
fprintf(fp, "key %lu, next=%lu, algo=%d, ",
rec->r.key.lid,
rec->r.key.next,
rec->r.key.pubkey_algo );
for(i=0; i < rec->r.key.fingerprint_len; i++ )
fprintf(fp, "%02X", rec->r.key.fingerprint[i] );
if( rec->r.key.keyflags & KEYF_REVOKED )
fputs(", revoked", fp );
putc('\n', fp);
break;
case RECTYPE_UID:
fprintf(fp, "uid %lu, next=%lu, pref=%lu, sig=%lu, hash=%02X%02X",
rec->r.uid.lid,
rec->r.uid.next,
rec->r.uid.prefrec,
rec->r.uid.siglist,
rec->r.uid.namehash[18], rec->r.uid.namehash[19]);
if( rec->r.uid.uidflags & UIDF_CHECKED )
fputs(", checked", fp );
if( rec->r.uid.uidflags & UIDF_VALID )
fputs(", valid", fp );
if( rec->r.uid.uidflags & UIDF_REVOKED )
fputs(", revoked", fp );
putc('\n', fp);
break;
case RECTYPE_PREF:
fprintf(fp, "pref %lu, next=%lu,",
rec->r.pref.lid, rec->r.pref.next);
for(i=0,p=rec->r.pref.data; i < ITEMS_PER_PREF_RECORD; i+=2,p+=2 ) {
if( *p )
fprintf(fp, " %c%d", *p == PREFTYPE_SYM ? 'S' :
*p == PREFTYPE_HASH ? 'H' :
*p == PREFTYPE_COMPR ? 'Z' : '?', p[1]);
}
putc('\n', fp);
break;
case RECTYPE_SIG:
fprintf(fp, "sig %lu, next=%lu,",
rec->r.sig.lid, rec->r.sig.next );
for(i=0; i < SIGS_PER_RECORD; i++ ) {
if( rec->r.sig.sig[i].lid )
fprintf(fp, " %lu:%02x", rec->r.sig.sig[i].lid,
rec->r.sig.sig[i].flag );
}
putc('\n', fp);
break;
case RECTYPE_SDIR:
fprintf(fp, "sdir %lu, keyid=%08lX%08lX, algo=%d, hint=%lu\n",
rec->r.sdir.lid,
(ulong)rec->r.sdir.keyid[0],
(ulong)rec->r.sdir.keyid[1],
rec->r.sdir.pubkey_algo,
(ulong)rec->r.sdir.hintlist );
break;
case RECTYPE_CACH:
fprintf(fp, "cach\n");
break;
case RECTYPE_HTBL:
fprintf(fp, "htbl,");
for(i=0; i < ITEMS_PER_HTBL_RECORD; i++ )
fprintf(fp, " %lu", rec->r.htbl.item[i] );
putc('\n', fp);
break;
case RECTYPE_HLST:
fprintf(fp, "hlst, next=%lu,", rec->r.hlst.next );
for(i=0; i < ITEMS_PER_HLST_RECORD; i++ )
fprintf(fp, " %lu", rec->r.hlst.rnum[i] );
putc('\n', fp);
break;
default:
fprintf(fp, "unknown type %d\n", rec->rectype );
break;
}
}
/****************
* read the record with number recnum
* returns: -1 on error, 0 on success
*/
int
tdbio_read_record( ulong recnum, TRUSTREC *rec, int expected )
{
byte buf[TRUST_RECORD_LEN], *p;
int rc = 0;
int n, i;
if( db_fd == -1 )
open_db();
if( lseek( db_fd, recnum * TRUST_RECORD_LEN, SEEK_SET ) == -1 ) {
log_error(_("trustdb: lseek failed: %s\n"), strerror(errno) );
return G10ERR_READ_FILE;
}
n = read( db_fd, buf, TRUST_RECORD_LEN);
if( !n ) {
return -1; /* eof */
}
else if( n != TRUST_RECORD_LEN ) {
log_error(_("trustdb: read failed (n=%d): %s\n"), n, strerror(errno) );
return G10ERR_READ_FILE;
}
rec->recnum = recnum;
rec->dirty = 0;
p = buf;
rec->rectype = *p++;
if( expected && rec->rectype != expected ) {
log_error("%lu: read expected rec type %d, got %d\n",
recnum, expected, rec->rectype );
return G10ERR_TRUSTDB;
}
p++; /* skip reserved byte */
switch( rec->rectype ) {
case 0: /* unused (free) record */
break;
case RECTYPE_VER: /* version record */
if( memcmp(buf+1, "gpg", 3 ) ) {
log_error_f( db_name, _("not a trustdb file\n") );
rc = G10ERR_TRUSTDB;
}
p += 2; /* skip "pgp" */
rec->r.ver.version = *p++;
p += 3; /* reserved bytes */
p += 4; /* lock flags */
rec->r.ver.created = buftoulong(p); p += 4;
rec->r.ver.modified = buftoulong(p); p += 4;
rec->r.ver.validated= buftoulong(p); p += 4;
rec->r.ver.keyhashtbl=buftoulong(p); p += 4;
rec->r.ver.firstfree =buftoulong(p); p += 4;
rec->r.ver.sdirhashtbl =buftoulong(p); p += 4;
if( recnum ) {
log_error_f( db_name, "version record with recnum %lu\n",
(ulong)recnum );
rc = G10ERR_TRUSTDB;
}
else if( rec->r.ver.version != 2 ) {
log_error_f( db_name, "invalid file version %d\n",
rec->r.ver.version );
rc = G10ERR_TRUSTDB;
}
break;
case RECTYPE_FREE:
rec->r.free.next = buftoulong(p); p += 4;
break;
case RECTYPE_DIR: /*directory record */
rec->r.dir.lid = buftoulong(p); p += 4;
rec->r.dir.keylist = buftoulong(p); p += 4;
rec->r.dir.uidlist = buftoulong(p); p += 4;
rec->r.dir.cacherec = buftoulong(p); p += 4;
rec->r.dir.ownertrust = *p++;
rec->r.dir.dirflags = *p++;
if( rec->r.dir.lid != recnum ) {
log_error_f( db_name, "dir LID != recnum (%lu,%lu)\n",
rec->r.dir.lid, (ulong)recnum );
rc = G10ERR_TRUSTDB;
}
break;
case RECTYPE_KEY: /* public key record */
rec->r.key.lid = buftoulong(p); p += 4;
rec->r.key.next = buftoulong(p); p += 4;
p += 7;
rec->r.key.keyflags = *p++;
rec->r.key.pubkey_algo = *p++;
rec->r.key.fingerprint_len = *p++;
if( rec->r.key.fingerprint_len < 1 || rec->r.key.fingerprint_len > 20 )
rec->r.key.fingerprint_len = 20;
memcpy( rec->r.key.fingerprint, p, 20);
break;
case RECTYPE_UID: /* user id record */
rec->r.uid.lid = buftoulong(p); p += 4;
rec->r.uid.next = buftoulong(p); p += 4;
rec->r.uid.prefrec = buftoulong(p); p += 4;
rec->r.uid.siglist = buftoulong(p); p += 4;
rec->r.uid.uidflags = *p++;
p ++;
memcpy( rec->r.uid.namehash, p, 20);
break;
case RECTYPE_PREF: /* preference record */
rec->r.pref.lid = buftoulong(p); p += 4;
rec->r.pref.next = buftoulong(p); p += 4;
memcpy( rec->r.pref.data, p, 30 );
break;
case RECTYPE_SIG:
rec->r.sig.lid = buftoulong(p); p += 4;
rec->r.sig.next = buftoulong(p); p += 4;
for(i=0; i < SIGS_PER_RECORD; i++ ) {
rec->r.sig.sig[i].lid = buftoulong(p); p += 4;
rec->r.sig.sig[i].flag = *p++;
}
break;
case RECTYPE_SDIR: /* shadow directory record */
rec->r.sdir.lid = buftoulong(p); p += 4;
rec->r.sdir.keyid[0]= buftou32(p); p += 4;
rec->r.sdir.keyid[1]= buftou32(p); p += 4;
rec->r.sdir.pubkey_algo = *p++;
p += 3;
rec->r.sdir.hintlist = buftoulong(p);
if( rec->r.sdir.lid != recnum ) {
log_error_f( db_name, "sdir LID != recnum (%lu,%lu)\n",
rec->r.sdir.lid, (ulong)recnum );
rc = G10ERR_TRUSTDB;
}
break;
case RECTYPE_CACH: /* cache record (FIXME)*/
rec->r.cache.lid = buftoulong(p); p += 4;
memcpy(rec->r.cache.blockhash, p, 20); p += 20;
rec->r.cache.trustlevel = *p++;
break;
case RECTYPE_HTBL:
for(i=0; i < ITEMS_PER_HTBL_RECORD; i++ ) {
rec->r.htbl.item[i] = buftoulong(p); p += 4;
}
break;
case RECTYPE_HLST:
rec->r.hlst.next = buftoulong(p); p += 4;
for(i=0; i < ITEMS_PER_HLST_RECORD; i++ ) {
rec->r.hlst.rnum[i] = buftoulong(p); p += 4;
}
break;
default:
log_error_f( db_name, "invalid record type %d at recnum %lu\n",
rec->rectype, (ulong)recnum );
rc = G10ERR_TRUSTDB;
break;
}
return rc;
}
/****************
* Write the record at RECNUM
* FIXME: create/update keyhash record.
*/
int
tdbio_write_record( TRUSTREC *rec )
{
byte buf[TRUST_RECORD_LEN], *p;
int rc = 0;
int i, n;
ulong recnum = rec->recnum;
if( db_fd == -1 )
open_db();
tdbio_dump_record( rec, stdout );
memset(buf, 0, TRUST_RECORD_LEN);
p = buf;
*p++ = rec->rectype; p++;
switch( rec->rectype ) {
case 0: /* unused record */
break;
case RECTYPE_VER: /* version record */
if( recnum )
BUG();
memcpy(p-1, "gpg", 3 ); p += 2;
*p++ = rec->r.ver.version;
p += 7; /* skip reserved bytes and lock flags */
ulongtobuf(p, rec->r.ver.created); p += 4;
ulongtobuf(p, rec->r.ver.modified); p += 4;
ulongtobuf(p, rec->r.ver.validated); p += 4;
ulongtobuf(p, rec->r.ver.keyhashtbl); p += 4;
ulongtobuf(p, rec->r.ver.firstfree ); p += 4;
ulongtobuf(p, rec->r.ver.sdirhashtbl ); p += 4;
break;
case RECTYPE_FREE:
ulongtobuf(p, rec->r.free.next); p += 4;
break;
case RECTYPE_DIR: /*directory record */
ulongtobuf(p, rec->r.dir.lid); p += 4;
ulongtobuf(p, rec->r.dir.keylist); p += 4;
ulongtobuf(p, rec->r.dir.uidlist); p += 4;
ulongtobuf(p, rec->r.dir.cacherec); p += 4;
*p++ = rec->r.dir.ownertrust;
*p++ = rec->r.dir.dirflags;
assert( rec->r.dir.lid == recnum );
break;
case RECTYPE_KEY:
ulongtobuf(p, rec->r.key.lid); p += 4;
ulongtobuf(p, rec->r.key.next); p += 4;
p += 7;
*p++ = rec->r.key.keyflags;
*p++ = rec->r.key.pubkey_algo;
*p++ = rec->r.key.fingerprint_len;
memcpy( p, rec->r.key.fingerprint, 20); p += 20;
break;
case RECTYPE_UID: /* user id record */
ulongtobuf(p, rec->r.uid.lid); p += 4;
ulongtobuf(p, rec->r.uid.next); p += 4;
ulongtobuf(p, rec->r.uid.prefrec); p += 4;
ulongtobuf(p, rec->r.uid.siglist); p += 4;
*p++ = rec->r.uid.uidflags;
p++;
memcpy( p, rec->r.uid.namehash, 20 ); p += 20;
break;
case RECTYPE_PREF:
ulongtobuf(p, rec->r.pref.lid); p += 4;
ulongtobuf(p, rec->r.pref.next); p += 4;
memcpy( p, rec->r.pref.data, 30 );
break;
case RECTYPE_SIG:
ulongtobuf(p, rec->r.sig.lid); p += 4;
ulongtobuf(p, rec->r.sig.next); p += 4;
for(i=0; i < SIGS_PER_RECORD; i++ ) {
ulongtobuf(p, rec->r.sig.sig[i].lid); p += 4;
*p++ = rec->r.sig.sig[i].flag;
}
break;
case RECTYPE_SDIR:
ulongtobuf( p, rec->r.sdir.lid); p += 4;
u32tobuf( p, rec->r.sdir.keyid[0] ); p += 4;
u32tobuf( p, rec->r.sdir.keyid[1] ); p += 4;
*p++ = rec->r.sdir.pubkey_algo;
p += 3;
ulongtobuf( p, rec->r.sdir.hintlist );
break;
case RECTYPE_CACH: /* FIXME*/
ulongtobuf(p, rec->r.cache.lid); p += 4;
memcpy(p, rec->r.cache.blockhash, 20); p += 20;
*p++ = rec->r.cache.trustlevel;
break;
case RECTYPE_HTBL:
for(i=0; i < ITEMS_PER_HTBL_RECORD; i++ ) {
ulongtobuf( p, rec->r.htbl.item[i]); p += 4;
}
break;
case RECTYPE_HLST:
ulongtobuf( p, rec->r.hlst.next); p += 4;
for(i=0; i < ITEMS_PER_HLST_RECORD; i++ ) {
ulongtobuf( p, rec->r.hlst.rnum[i]); p += 4;
}
break;
default:
BUG();
}
if( lseek( db_fd, recnum * TRUST_RECORD_LEN, SEEK_SET ) == -1 ) {
log_error(_("trustdb: lseek failed: %s\n"), strerror(errno) );
return G10ERR_WRITE_FILE;
}
n = write( db_fd, buf, TRUST_RECORD_LEN);
if( n != TRUST_RECORD_LEN ) {
log_error(_("trustdb: write failed (n=%d): %s\n"), n, strerror(errno) );
return G10ERR_WRITE_FILE;
}
else if( rec->rectype == RECTYPE_KEY )
rc = update_keyhashtbl( rec );
else if( rec->rectype == RECTYPE_SDIR )
rc = update_sdirhashtbl( rec );
return rc;
}
int
tdbio_delete_record( ulong recnum )
{
TRUSTREC vr, rec;
int rc;
rc = tdbio_read_record( 0, &vr, RECTYPE_VER );
if( rc )
log_fatal_f( db_name, _("error reading version record: %s\n"),
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;
}
/****************
* 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_f( db_name, _("error reading version record: %s\n"),
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_f( db_name, _("error reading free record: %s\n"),
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_f( db_name, _("error writing dir record: %s\n"),
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_f(db_name,_("failed to zero a record: %s\n"),
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 = tdbio_write_record( &rec );
if( rc )
log_fatal_f(db_name,_("failed to append a record: %s\n"),
g10_errstr(rc));
}
return recnum ;
}
/****************
* Search the trustdb for a key which matches PK and return the dir record
* The local_id of PK is set to the correct value
*/
int
tdbio_search_dir_bypk( PKT_public_key *pk, TRUSTREC *rec )
{
byte fingerprint[MAX_FINGERPRINT_LEN];
size_t fingerlen;
u32 keyid[2];
int rc;
keyid_from_pk( pk, keyid );
fingerprint_from_pk( pk, fingerprint, &fingerlen );
rc = tdbio_search_dir_byfpr( fingerprint, fingerlen,
pk->pubkey_algo, rec );
if( !rc ) {
if( pk->local_id && pk->local_id != rec->recnum )
log_error_f(db_name,
"found record, but LID from memory does "
"not match recnum (%lu,%lu)\n",
pk->local_id, rec->recnum );
pk->local_id = rec->recnum;
}
return rc;
}
static int
cmp_krec_fpr( void *dataptr, const TRUSTREC *rec )
{
const struct cmp_krec_fpr_struct *d = dataptr;
return rec->rectype == RECTYPE_KEY
&& ( !d->pubkey_algo || rec->r.key.pubkey_algo == d->pubkey_algo )
&& rec->r.key.fingerprint_len == d->fprlen
&& !memcmp( rec->r.key.fingerprint, d->fpr, d->fprlen );
}
int
tdbio_search_dir_byfpr( const byte *fingerprint, size_t fingerlen,
int pubkey_algo, TRUSTREC *rec )
{
struct cmp_krec_fpr_struct cmpdata;
ulong recnum;
int rc;
assert( fingerlen == 20 || fingerlen == 16 );
/* locate the key using the hash table */
cmpdata.pubkey_algo = pubkey_algo;
cmpdata.fpr = fingerprint;
cmpdata.fprlen = fingerlen;
rc = lookup_hashtable( get_keyhashrec(), fingerprint, fingerlen,
cmp_krec_fpr, &cmpdata, rec );
if( !rc ) {
recnum = rec->r.key.lid;
/* Now read the dir record */
rc = tdbio_read_record( recnum, rec, RECTYPE_DIR);
if( rc )
log_error_f(db_name, "can't read dirrec %lu: %s\n",
recnum, g10_errstr(rc) );
}
return rc;
}
static int
cmp_sdir( void *dataptr, const TRUSTREC *rec )
{
const struct cmp_sdir_struct *d = dataptr;
return rec->rectype == RECTYPE_SDIR
&& ( !d->pubkey_algo || rec->r.sdir.pubkey_algo == d->pubkey_algo )
&& rec->r.sdir.keyid[0] == d->keyid[0]
&& rec->r.sdir.keyid[1] == d->keyid[1];
}
int
tdbio_search_sdir( u32 *keyid, int pubkey_algo, TRUSTREC *rec )
{
struct cmp_sdir_struct cmpdata;
int rc;
byte key[8];
/* locate the shadow dir record using the hash table */
u32tobuf( key , keyid[0] );
u32tobuf( key+4 , keyid[1] );
cmpdata.pubkey_algo = pubkey_algo;
cmpdata.keyid[0] = keyid[0];
cmpdata.keyid[1] = keyid[1];
rc = lookup_hashtable( get_sdirhashrec(), key, 8,
cmp_sdir, &cmpdata, rec );
return rc;
}

File Metadata

Mime Type
text/x-c
Expires
Mon, Sep 15, 10:27 PM (1 d, 2 h)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
79/22/9c6605c96f5b5b1935d3f1af352a

Event Timeline