/
bdbtarpit.c
508 lines (438 loc) · 12.5 KB
/
bdbtarpit.c
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/* bdbtarpit.c
*
* VERSION information is in bdbtarpit.h
*
* Copyright 2003 - 2009, Michael Robinton <michael@bizsystems.com> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the same terms as Perl itself. *
* *
* **************************************************************************** *
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "bdbtarpit.h"
char versionstring[100];
/* from BDB
typedef struct {
void *data;
u_int32_t size;
u_int32_t ulen;
u_int32_t dlen;
u_int32_t doff;
u_int32_t flags;
} DBT;
*/
/* **************************** *
* close environment *
* **************************** */
void
dbtp_env_close(DBTPD * dbtp)
{
if (dbtp->dbenv != NULL) {
#if DB_VERSION_MAJOR == 2
dbtp->dberr = db_appexit(dbtp->dbenv);
#else /* DB_VERSION_MAJOR > 2 */
dbtp->dberr = dbtp->dbenv->close(dbtp->dbenv, 0);
#endif
}
dbtp->dbenv = NULL;
}
/* **************************** *
* finish & exit *
* **************************** */
void
dbtp_close(DBTPD * dbtp)
{
/* close database(s) */
int ai;
if (dbtp->dbenv == NULL)
return;
for(ai=0; ai<DBTP_MAXdbf; ai++) {
if (dbtp->dbaddr[ai] == NULL)
continue;
(void)dbtp->dbaddr[ai]->close(dbtp->dbaddr[ai],0);
dbtp->dbaddr[ai] = NULL;
}
dbtp_env_close(dbtp);
}
/* ***************************************************************************
* init database
* init all databases present in the name array if 'index' is < 0
* otherwise initialize only the specific database pointed to by 'index'
*
* Exception: if index == DB_RUNRECOVERY, then DBENV->remove
* is performed before the environment is opened.
* ***************************************************************************
Returns: 0 on success, or error code
*/
int
dbtp_init(DBTPD * dbtp, unsigned char * home, int index)
{
u_int32_t eflags = DB_CREATE | DB_INIT_CDB | DB_INIT_MPOOL;
u_int32_t dflags = DB_CREATE;
u_int32_t info = DB_RECNUM;
DBTYPE type = DB_BTREE;
int mode = 0664;
int ai;
/*
* OPEN / CREATE ENVIRONMENT
*
* Since the databases are not transactional, we really don't run recovery.
* All that is typically corrupted is the DB environment so destroy the
* environment files and recreate them instead. If this does not work,
* operator intervention will be necessary.
*/
#if DB_VERSION_MAJOR == 2
if (index == DB_RUNRECOVERY)
goto DBTP_env_err; /* sorry, can't do recovery unless > version 2 */
if ((dbtp->dbenv = (DB_ENV *) calloc(sizeof(DB_ENV), 1)) == NULL )
return (dbtp->dberr = errno);
if (dbtp->dberr = db_appinit(home, NULL, dbtp->dbenv, eflags | DB_USE_ENVIRON) != 0)
{
free(dbtp->dbenv);
DBTP_env_err:
dbtp->dbenv = NULL;
return(dbtp->dberr);
}
#else /* DB_VERSION_MAJOR > 2 */
DBTP_reopen:
if ((dbtp->dberr = db_env_create(&dbtp->dbenv,0)) != 0)
goto DBTP_env_err;
if (index == DB_RUNRECOVERY) {
#ifdef IS_DB_3_0_x
if ((dbtp->dberr = dbtp->dbenv->remove(dbtp->dbenv, (char *)home, NULL, DB_FORCE)) != 0)
#else /* > 3.0 */
if ((dbtp->dberr = dbtp->dbenv->remove(dbtp->dbenv, (char *)home, DB_FORCE)) != 0)
#endif
goto DBTP_env_err;
index = -1;
dbtp->dbenv = NULL;
goto DBTP_reopen;
}
#ifdef IS_DB_3_0_x
if ((dbtp->dberr = dbtp->dbenv->open(dbtp->dbenv, (char *)home, NULL, eflags, mode)) != 0) {
#else /* > 3.0 */
if ((dbtp->dberr = dbtp->dbenv->open(dbtp->dbenv, (char *)home, eflags, mode)) != 0) {
#endif
(void)dbtp->dbenv->close(dbtp->dbenv, 0);
DBTP_env_err:
dbtp->dbenv = NULL;
return(dbtp->dberr);
}
#endif /* DB_VERSION_MAJOR > 2 */
/*
* CREATE / OPEN DATABASE's
*/
for(ai=0; ai<DBTP_MAXdbf; ai++) {
if (index < 0) {
if (dbtp->dbfile[ai] == NULL) {
if (ai)
return(dbtp->dberr); /* last status if end of array and something opened */
else {
dbtp_env_close(dbtp);
return(dbtp->dberr = ENODATA); /* fatal if nothing to open */
}
}
}
else {
ai = index;
index = 1; /* always 'positive' if active */
}
if ((dbtp->dberr = db_create(&dbtp->dbaddr[ai],dbtp->dbenv,0)) != 0)
{
Bail:
dbtp_close(dbtp);
return(dbtp->dberr);
}
if ((dbtp->dberr = dbtp->dbaddr[ai]->set_flags(dbtp->dbaddr[ai], info)) != 0)
goto Bail;
#if DB_VERSION_MAJOR > 2
#ifdef AT_LEAST_DB_4_1
if ((dbtp->dberr = (dbtp->dbaddr[ai]->open(dbtp->dbaddr[ai], NULL, dbtp->dbfile[ai], NULL, type, dflags, mode))) != 0)
#else
if ((dbtp->dberr = (dbtp->dbaddr[ai]->open(dbtp->dbaddr[ai], dbtp->dbfile[ai], NULL, type, dflags, mode))) != 0)
#endif /* AT_LEAST_DB_4_1 */
#else /* DB_VERSION_MAJOR == 2 */
if ((dbtp->dberr = db_open(dbtp->dbfile[ai], type, dflags, mode, dbtp->dbenv, info, &dbtp->dbaddr[ai]))) != 0)
#endif /* DB_VERSION_MAJOR == 2 */
goto Bail;
if (index > 0)
break;
}
return(dbtp->dberr);
}
/* returns 0 if addr and *addr are valid
* else it returns DB_KEYEMPTY
*/
int
_dbtp_set(DBTPD * dbtp, void * addr, size_t size)
{
if (size != sizeof(u_int32_t) || addr == NULL || *(u_int32_t *)addr == 0)
return(DB_KEYEMPTY);
memset(&dbtp->keydbt, 0, sizeof(DBT));
memset(&dbtp->mgdbt, 0, sizeof(DBT));
dbtp->keydbt.data = addr;
dbtp->keydbt.size = (u_int32_t)size;
return(0);
}
/* **************************** *
* return 0 on success *
* or the bdb error code *
* external data structure *
* mgdbt is filled *
*
* typedef struct {
* void *data;
* u_int32_t size;
* u_int32_t ulen;
* u_int32_t dlen;
* u_int32_t doff;
* u_int32_t flags;
* } DBT;
*
*/
int
dbtp_get(DBTPD * dbtp, int ai, void * addr, size_t size)
{
if(dbtp->dbaddr[ai] == NULL)
return(dbtp->dberr = ENODATA);
if ((dbtp->dberr = _dbtp_set(dbtp,addr,size)))
return(dbtp->dberr);
return(dbtp->dberr = dbtp->dbaddr[ai]->get(dbtp->dbaddr[ai], NULL, &dbtp->keydbt, &dbtp->mgdbt, 0));
}
/* **************************** *
* return 0 on success *
* or the bdb error code *
* external data structure *
* mgdbt and keydbt are *
* filled *
*
* typedef struct {
* void *data;
* u_int32_t size;
* u_int32_t ulen;
* u_int32_t dlen;
* u_int32_t doff;
* u_int32_t flags;
* } DBT;
*
*/
int
dbtp_getrecno(DBTPD * dbtp, int ai, u_int32_t cursor)
{
if(dbtp->dbaddr[ai] == NULL)
return(dbtp->dberr = ENODATA);
REGET_by_cursor:
memset(&dbtp->keydbt, 0, sizeof(DBT));
memset(&dbtp->mgdbt, 0, sizeof(DBT));
dbtp->keydbt.data = &cursor;
dbtp->keydbt.size = (u_int32_t)sizeof(cursor);
return(dbtp->dberr = dbtp->dbaddr[ai]->get(dbtp->dbaddr[ai], NULL, &dbtp->keydbt, &dbtp->mgdbt, DB_SET_RECNO));
dbtp->dberr = dbtp->dbaddr[ai]->get(dbtp->dbaddr[ai], NULL, &dbtp->keydbt, &dbtp->mgdbt, DB_SET_RECNO);
if (! dbtp->dberr && dbtp->keydbt.size != sizeof(INADDR_BROADCAST)) {
dbtp_del(dbtp,ai,dbtp->keydbt.data,dbtp->keydbt.size);
goto REGET_by_cursor;
}
return(dbtp->dberr);
}
/* get the number of keys or records from the target database, by index */
u_int32_t
dbtp_stati(DBTPD * dbtp, int ai)
{
DB_BTREE_STAT * statistics = NULL;
u_int32_t bt_nkeys;
if(dbtp->dbaddr[ai] == NULL) {
dbtp->dberr = DB_NOTFOUND;
return(0);
}
#ifdef AT_LEAST_DB_4_3
dbtp->dberr = dbtp->dbaddr[ai]->stat(dbtp->dbaddr[ai],NULL,&statistics,DB_FAST_STAT);
#else
# ifdef AT_LEAST_DB_3_3
dbtp->dberr = dbtp->dbaddr[ai]->stat(dbtp->dbaddr[ai],&statistics,DB_FAST_STAT);
# else
dbtp->dberr = dbtp->dbaddr[ai]->stat(dbtp->dbaddr[ai],&statistics,NULL,DB_RECORDCOUNT);
# endif
#endif
if (dbtp->dberr)
bt_nkeys = 0;
else
#ifdef AT_LEAST_DB_3_1
bt_nkeys = statistics->bt_nkeys;
#else
bt_nkeys = statistics->bt_nrecs;
#endif
free(statistics);
return(bt_nkeys);
}
/* get the number of keys or records from the target database, by name */
u_int32_t
dbtp_statn(DBTPD * dbtp, char * name)
{
int ai;
if ((ai = dbtp_index(dbtp, name)) < 0)
return(0);
return(dbtp_stati(dbtp, ai));
}
/* return pointer to database or NULL if name not matched */
int
dbtp_index(DBTPD * dbtp, char * name)
{
int ai;
for(ai=0; ai<DBTP_MAXdbf; ai++) {
if(dbtp->dbfile[ai] == NULL)
goto NotFound;
if(strcmp(name,dbtp->dbfile[ai]))
continue;
return(ai);
}
NotFound:
dbtp->dberr = -1;
return(-1);
}
/* read data from a particular database, enter with pointer to db and method */
int
dbtp_readOne(DBTPD * dbtp, u_char how, int ai, void * ptr, int is_network)
{
int major, minor, patch;
u_int32_t cursor;
u_char * vp;
if (how) {
/* it is a normal record access since 0 is never a valid record number */
if (is_network)
cursor = ntohl(*(u_int32_t *)ptr);
else
cursor = *(u_int32_t *)ptr;
if (cursor)
dbtp->dberr = dbtp_getrecno(dbtp,ai,cursor);
else {
/* send back the number of keys in the database and the version number
* All the data is stuffed into the DBT structure since it is not used to get the data
*
* generate the version info
*/
(void)db_version(&major,&minor,&patch);
vp = (u_char *)&dbtp->keydbt.flags;
dbtp->keydbt.data = vp;
dbtp->keydbt.size = (u_int32_t)sizeof(u_int32_t); /* size of IPv4 netaddr */
*vp++ = 0;
*vp++ = (u_char)major;
*vp++ = (u_char)minor;
*vp++ = (u_char)patch;
/* generate the number of keys/records in the database */
dbtp->mgdbt.data = &dbtp->mgdbt.flags;
dbtp->mgdbt.size = (u_int32_t)sizeof(u_int32_t);
dbtp->mgdbt.flags = dbtp_stati(dbtp,ai);
if (is_network)
dbtp->mgdbt.flags = htonl(dbtp->mgdbt.flags);
return(0);
}
}
else
dbtp->dberr = dbtp_get(dbtp,ai,ptr,sizeof(void *));
if (dbtp->mgdbt.size == sizeof(u_int32_t)) { /* is this a u_int32_t ??, all other records are larger */
if (is_network)
*(u_int32_t *)(dbtp->mgdbt.data) = htonl(*(u_int32_t *)(dbtp->mgdbt.data));
}
return(dbtp->dberr);
}
/* reads from database
* how = 0, read by key
* how = 1, read by record number
* name = database name
* ptr = pointer to key or cursor
* is_net = 1 reads must convert network to host order
* returns same as dbtp_get* above
*/
int
dbtp_readDB(DBTPD * dbtp, u_char how, char * name, void * ptr, int is_network)
{
int ai;
if ((ai = dbtp_index(dbtp,name)) < 0 )
return(DB_NOTFOUND);
return(dbtp_readOne(dbtp,how,ai,ptr,is_network));
}
int
_dbtp_halfput(DBTPD * dbtp, int ai, void * data, size_t size)
{
dbtp->mgdbt.data = data;
dbtp->mgdbt.size = (u_int32_t)size;
return(dbtp->dberr = dbtp->dbaddr[ai]->put(dbtp->dbaddr[ai], NULL, &dbtp->keydbt, &dbtp->mgdbt, 0));
}
int
dbtp_put(DBTPD * dbtp, int ai, void * addr, size_t asize, void * data, size_t dsize)
{
if (dbtp->dbaddr[ai] == NULL)
return(dbtp->dberr = ENODATA);
if ((dbtp->dberr = _dbtp_set(dbtp,addr,asize)))
return(dbtp->dberr);
return(_dbtp_halfput(dbtp,ai,data,dsize));
}
int
dbtp_sync(DBTPD * dbtp, int ai)
{
if(dbtp->dbaddr[ai] == NULL)
return(dbtp->dberr = ENODATA);
return(dbtp->dberr = dbtp->dbaddr[ai]->sync(dbtp->dbaddr[ai],0));
}
/* **************************** *
* check for match *
* **************************** *
Returns:
false if addr is not in the database
true + stores timestamp if addr
is present in the database
*/
int
dbtp_find_addr(DBTPD * dbtp, int ai, void * addr, u_int32_t timestamp)
{
if (dbtp_get(dbtp,ai,addr,sizeof(void *))) /* size of a pointer */
return(0);
/* (void) */
dbtp->dberr = _dbtp_halfput(dbtp,ai,×tamp,sizeof(timestamp));
/* dbtp->dberr = dbtp->dbaddr[ai]->sync(dbtp->dbaddr[ai],0); */
return(1);
}
int
dbtp_del(DBTPD * dbtp, int ai, void * addr, size_t size)
{
DBT key;
if(dbtp->dbaddr[ai] == NULL)
return(dbtp->dberr = ENODATA);
bzero(&key,sizeof(DBT));
key.data = addr;
key.size = (u_int32_t)size;
return(dbtp->dberr = dbtp->dbaddr[ai]->del(dbtp->dbaddr[ai],NULL,&key,0));
}
int
dbtp_notfound()
{
return(DB_NOTFOUND);
}
char *
dbtp_libversion(int * major, int * minor, int * patch)
{
extern char versionstring[];
if (major != NULL)
*major = DBTP_MAJOR;
if (minor != NULL)
*minor = DBTP_MINOR;
if (patch != NULL)
*patch = DBTP_PATCH;
sprintf(versionstring,"dbtarpit library version %d.%d.%d: %s",DBTP_MAJOR,DBTP_MINOR,DBTP_PATCH,DBTP_DATE);
return(versionstring);
}
char *
dbtp_bdbversion(int * major, int * minor, int * patch)
{
return(db_version(major,minor,patch));
}
char *
dbtp_strerror(int err)
{
return(db_strerror(err));
}