320 lines
6.3 KiB
C
320 lines
6.3 KiB
C
/* mdb_dump.c - memory-mapped database dump tool */
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/*
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* Copyright 2011-2018 Howard Chu, Symas Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <signal.h>
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#include "lmdb.h"
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#define Yu MDB_PRIy(u)
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#define PRINT 1
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static int mode;
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typedef struct flagbit {
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int bit;
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char *name;
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} flagbit;
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flagbit dbflags[] = {
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{ MDB_REVERSEKEY, "reversekey" },
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{ MDB_DUPSORT, "dupsort" },
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{ MDB_INTEGERKEY, "integerkey" },
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{ MDB_DUPFIXED, "dupfixed" },
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{ MDB_INTEGERDUP, "integerdup" },
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{ MDB_REVERSEDUP, "reversedup" },
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{ 0, NULL }
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};
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static volatile sig_atomic_t gotsig;
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static void dumpsig( int sig )
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{
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gotsig=1;
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}
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static const char hexc[] = "0123456789abcdef";
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static void hex(unsigned char c)
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{
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putchar(hexc[c >> 4]);
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putchar(hexc[c & 0xf]);
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}
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static void text(MDB_val *v)
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{
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unsigned char *c, *end;
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putchar(' ');
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c = v->mv_data;
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end = c + v->mv_size;
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while (c < end) {
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if (isprint(*c)) {
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if (*c == '\\')
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putchar('\\');
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putchar(*c);
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} else {
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putchar('\\');
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hex(*c);
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}
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c++;
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}
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putchar('\n');
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}
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static void byte(MDB_val *v)
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{
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unsigned char *c, *end;
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putchar(' ');
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c = v->mv_data;
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end = c + v->mv_size;
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while (c < end) {
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hex(*c++);
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}
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putchar('\n');
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}
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/* Dump in BDB-compatible format */
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static int dumpit(MDB_txn *txn, MDB_dbi dbi, char *name)
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{
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MDB_cursor *mc;
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MDB_stat ms;
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MDB_val key, data;
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MDB_envinfo info;
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unsigned int flags;
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int rc, i;
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rc = mdb_dbi_flags(txn, dbi, &flags);
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if (rc) return rc;
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rc = mdb_stat(txn, dbi, &ms);
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if (rc) return rc;
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rc = mdb_env_info(mdb_txn_env(txn), &info);
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if (rc) return rc;
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printf("VERSION=3\n");
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printf("format=%s\n", mode & PRINT ? "print" : "bytevalue");
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if (name)
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printf("database=%s\n", name);
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printf("type=btree\n");
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printf("mapsize=%"Yu"\n", info.me_mapsize);
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if (info.me_mapaddr)
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printf("mapaddr=%p\n", info.me_mapaddr);
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printf("maxreaders=%u\n", info.me_maxreaders);
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if (flags & MDB_DUPSORT)
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printf("duplicates=1\n");
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for (i=0; dbflags[i].bit; i++)
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if (flags & dbflags[i].bit)
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printf("%s=1\n", dbflags[i].name);
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printf("db_pagesize=%d\n", ms.ms_psize);
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printf("HEADER=END\n");
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rc = mdb_cursor_open(txn, dbi, &mc);
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if (rc) return rc;
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while ((rc = mdb_cursor_get(mc, &key, &data, MDB_NEXT) == MDB_SUCCESS)) {
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if (gotsig) {
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rc = EINTR;
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break;
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}
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if (mode & PRINT) {
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text(&key);
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text(&data);
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} else {
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byte(&key);
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byte(&data);
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}
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}
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printf("DATA=END\n");
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if (rc == MDB_NOTFOUND)
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rc = MDB_SUCCESS;
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return rc;
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}
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static void usage(char *prog)
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{
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fprintf(stderr, "usage: %s [-V] [-f output] [-l] [-n] [-p] [-v] [-a|-s subdb] dbpath\n", prog);
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exit(EXIT_FAILURE);
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}
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int main(int argc, char *argv[])
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{
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int i, rc;
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MDB_env *env;
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MDB_txn *txn;
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MDB_dbi dbi;
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char *prog = argv[0];
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char *envname;
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char *subname = NULL;
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int alldbs = 0, envflags = 0, list = 0;
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if (argc < 2) {
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usage(prog);
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}
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/* -a: dump main DB and all subDBs
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* -s: dump only the named subDB
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* -n: use NOSUBDIR flag on env_open
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* -p: use printable characters
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* -f: write to file instead of stdout
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* -v: use previous snapshot
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* -V: print version and exit
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* (default) dump only the main DB
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*/
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while ((i = getopt(argc, argv, "af:lnps:V")) != EOF) {
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switch(i) {
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case 'V':
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printf("%s\n", MDB_VERSION_STRING);
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exit(0);
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break;
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case 'l':
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list = 1;
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/*FALLTHROUGH*/;
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case 'a':
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if (subname)
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usage(prog);
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alldbs++;
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break;
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case 'f':
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if (freopen(optarg, "w", stdout) == NULL) {
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fprintf(stderr, "%s: %s: reopen: %s\n",
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prog, optarg, strerror(errno));
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exit(EXIT_FAILURE);
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}
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break;
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case 'n':
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envflags |= MDB_NOSUBDIR;
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break;
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case 'v':
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envflags |= MDB_PREVSNAPSHOT;
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break;
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case 'p':
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mode |= PRINT;
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break;
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case 's':
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if (alldbs)
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usage(prog);
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subname = optarg;
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break;
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default:
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usage(prog);
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}
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}
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if (optind != argc - 1)
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usage(prog);
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#ifdef SIGPIPE
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signal(SIGPIPE, dumpsig);
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#endif
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#ifdef SIGHUP
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signal(SIGHUP, dumpsig);
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#endif
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signal(SIGINT, dumpsig);
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signal(SIGTERM, dumpsig);
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envname = argv[optind];
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rc = mdb_env_create(&env);
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if (rc) {
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fprintf(stderr, "mdb_env_create failed, error %d %s\n", rc, mdb_strerror(rc));
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return EXIT_FAILURE;
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}
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if (alldbs || subname) {
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mdb_env_set_maxdbs(env, 2);
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}
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rc = mdb_env_open(env, envname, envflags | MDB_RDONLY, 0664);
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if (rc) {
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fprintf(stderr, "mdb_env_open failed, error %d %s\n", rc, mdb_strerror(rc));
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goto env_close;
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}
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rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
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if (rc) {
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fprintf(stderr, "mdb_txn_begin failed, error %d %s\n", rc, mdb_strerror(rc));
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goto env_close;
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}
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rc = mdb_open(txn, subname, 0, &dbi);
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if (rc) {
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fprintf(stderr, "mdb_open failed, error %d %s\n", rc, mdb_strerror(rc));
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goto txn_abort;
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}
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if (alldbs) {
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MDB_cursor *cursor;
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MDB_val key;
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int count = 0;
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rc = mdb_cursor_open(txn, dbi, &cursor);
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if (rc) {
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fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
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goto txn_abort;
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}
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while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT_NODUP)) == 0) {
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char *str;
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MDB_dbi db2;
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if (memchr(key.mv_data, '\0', key.mv_size))
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continue;
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count++;
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str = malloc(key.mv_size+1);
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memcpy(str, key.mv_data, key.mv_size);
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str[key.mv_size] = '\0';
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rc = mdb_open(txn, str, 0, &db2);
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if (rc == MDB_SUCCESS) {
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if (list) {
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printf("%s\n", str);
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list++;
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} else {
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rc = dumpit(txn, db2, str);
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if (rc)
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break;
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}
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mdb_close(env, db2);
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}
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free(str);
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if (rc) continue;
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}
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mdb_cursor_close(cursor);
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if (!count) {
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fprintf(stderr, "%s: %s does not contain multiple databases\n", prog, envname);
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rc = MDB_NOTFOUND;
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} else if (rc == MDB_NOTFOUND) {
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rc = MDB_SUCCESS;
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}
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} else {
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rc = dumpit(txn, dbi, subname);
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}
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if (rc && rc != MDB_NOTFOUND)
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fprintf(stderr, "%s: %s: %s\n", prog, envname, mdb_strerror(rc));
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mdb_close(env, dbi);
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txn_abort:
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mdb_txn_abort(txn);
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env_close:
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mdb_env_close(env);
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return rc ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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