mk-amd-map.c revision 310490 
1/*
2 * Copyright (c) 1997-2014 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *
36 * File: am-utils/mk-amd-map/mk-amd-map.c
37 */
38
39/*
40 * Convert a file map into an ndbm map
41 */
42
43#ifdef HAVE_CONFIG_H
44# include <config.h>
45#endif /* HAVE_CONFIG_H */
46#include <am_defs.h>
47
48/* (libdb version 2) uses .db extensions but an old dbm API */
49/* check for libgdbm to distinguish it from linux systems */
50#if defined(DBM_SUFFIX) && !defined(HAVE_LIBGDBM)
51# define HAVE_DB_SUFFIX
52#endif /* not defined(DBM_SUFFIX) && !defined(HAVE_LIBGDBM) */
53
54#ifdef HAVE_MAP_NDBM
55
56static int
57store_data(voidp db, char *k, char *v)
58{
59  datum key, val;
60
61  key.dptr = k;
62  val.dptr = v;
63  key.dsize = strlen(k) + 1;
64  val.dsize = strlen(v) + 1;
65  return dbm_store((DBM *) db, key, val, DBM_INSERT);
66}
67
68
69/*
70 * Read one line from file.
71 */
72static int
73read_line(char *buf, int size, FILE *fp)
74{
75  int done = 0;
76
77  do {
78    while (fgets(buf, size, fp)) {
79      int len = strlen(buf);
80
81      done += len;
82      if (len > 1 && buf[len - 2] == '\\' && buf[len - 1] == '\n') {
83	int ch;
84	buf += len - 2;
85	size -= len - 2;
86	*buf = '\n';
87	buf[1] = '\0';
88
89	/*
90	 * Skip leading white space on next line
91	 */
92	while ((ch = getc(fp)) != EOF && isascii((unsigned char)ch) && isspace((unsigned char)ch)) ;
93	(void) ungetc(ch, fp);
94      } else {
95	return done;
96      }
97    }
98  } while (size > 0 && !feof(fp));
99
100  return done;
101}
102
103
104/*
105 * Read through a map.
106 */
107static int
108read_file(FILE *fp, char *map, voidp db)
109{
110  char key_val[2048];
111  int chuck = 0;
112  int line_no = 0;
113  int errs = 0;
114
115  while (read_line(key_val, 2048, fp)) {
116    char *kp;
117    char *cp;
118    char *hash;
119    int len = strlen(key_val);
120
121    line_no++;
122
123    /*
124     * Make sure we got the whole line
125     */
126    if (key_val[len - 1] != '\n') {
127      fprintf(stderr, "line %d in \"%s\" is too long", line_no, map);
128      chuck = 1;
129    } else {
130      key_val[len - 1] = '\0';
131    }
132
133    /*
134     * Strip comments
135     */
136    hash = strchr(key_val, '#');
137    if (hash)
138      *hash = '\0';
139
140    /*
141     * Find start of key
142     */
143    for (kp = key_val; *kp && isascii((unsigned char)*kp) && isspace((unsigned char)*kp); kp++) ;
144
145    /*
146     * Ignore blank lines
147     */
148    if (!*kp)
149      goto again;
150
151    /*
152     * Find end of key
153     */
154    for (cp = kp; *cp && (!isascii((unsigned char)*cp) || !isspace((unsigned char)*cp)); cp++) ;
155
156    /*
157     * Check whether key matches, or whether
158     * the entry is a wildcard entry.
159     */
160    if (*cp)
161      *cp++ = '\0';
162    while (*cp && isascii((unsigned char)*cp) && isspace((unsigned char)*cp))
163      cp++;
164    if (*kp == '+') {
165      fprintf(stderr, "Can't interpolate %s\n", kp);
166      errs++;
167    } else if (*cp) {
168      if (db) {
169	if (store_data(db, kp, cp) < 0) {
170	  fprintf(stderr, "Could store %s -> %s\n", kp, cp);
171	  errs++;
172	}
173      } else {
174	printf("%s\t%s\n", kp, cp);
175      }
176    } else {
177      fprintf(stderr, "%s: line %d has no value field", map, line_no);
178      errs++;
179    }
180
181  again:
182    /*
183     * If the last read didn't get a whole line then
184     * throw away the remainder before continuing...
185     */
186    if (chuck) {
187      while (fgets(key_val, sizeof(key_val), fp) &&
188	     !strchr(key_val, '\n')) ;
189      chuck = 0;
190    }
191  }
192  return errs;
193}
194
195
196static int
197remove_file(char *f)
198{
199  if (unlink(f) < 0 && errno != ENOENT)
200    return -1;
201
202  return 0;
203}
204
205
206int
207main(int argc, char *argv[])
208{
209  FILE *mapf;			/* the input file to read from */
210  int error;
211  char *mapsrc;
212  DBM *db = NULL;
213  static char maptmp[] = "dbmXXXXXX";
214#ifdef HAVE_DB_SUFFIX
215  char maptdb[16];
216  char *map_name_db = (char *) NULL;
217#else /* not HAVE_DB_SUFFIX */
218  char maptpag[16], maptdir[16];
219  char *map_name_pag = (char *) NULL, *map_name_dir = (char *) NULL;
220#endif /* not HAVE_DB_SUFFIX */
221  size_t l = 0;
222  char *sl;
223  int printit = 0;
224  int usage = 0;
225  int ch;
226  extern int optind;
227
228  /* test options */
229  while ((ch = getopt(argc, argv, "p")) != -1)
230    switch (ch) {
231    case 'p':
232      printit = 1;
233      break;
234    default:
235      usage++;
236      break;
237    }
238
239  if (usage || optind != (argc - 1)) {
240    fputs("Usage: mk-amd-map [-p] file-map\n", stderr);
241    exit(1);
242  }
243  mapsrc = argv[optind];
244
245  /* test if can get to the map directory */
246  sl = strrchr(mapsrc, '/');
247  if (sl) {
248    *sl = '\0';
249    if (chdir(mapsrc) < 0) {
250      fputs("Can't chdir to ", stderr);
251      perror(mapsrc);
252      exit(1);
253    }
254    mapsrc = sl + 1;
255  }
256
257  /* open source file */
258  mapf = fopen(mapsrc, "r");
259  if (!mapf) {
260    fprintf(stderr, "cannot open source file ");
261    perror(mapsrc);
262    exit(1);
263  }
264
265#ifndef DEBUG
266  signal(SIGINT, SIG_IGN);
267#endif /* DEBUG */
268
269  if (!printit) {
270    /* enough space for ".db" or ".pag" or ".dir" appended */
271    l = strlen(mapsrc) + 5;
272#ifdef HAVE_DB_SUFFIX
273    map_name_db = (char *) malloc(l);
274    error = (map_name_db == NULL);
275#else /* not HAVE_DB_SUFFIX */
276    map_name_pag = (char *) malloc(l);
277    map_name_dir = (char *) malloc(l);
278    error = (map_name_pag == NULL || map_name_dir == NULL);
279#endif /* not HAVE_DB_SUFFIX */
280    if (error) {
281      perror("mk-amd-map: malloc");
282      exit(1);
283    }
284
285#ifdef HAVE_MKSTEMP
286    {
287      /*
288       * XXX: hack to avoid compiler complaints about mktemp not being
289       * secure, since we have to do a dbm_open on this anyway.  So use
290       * mkstemp if you can, and then close the fd, but we get a safe
291       * and unique file name.
292       */
293      int dummyfd;
294      dummyfd = mkstemp(maptmp);
295      if (dummyfd >= 0)
296	close(dummyfd);
297    }
298#else /* not HAVE_MKSTEMP */
299    mktemp(maptmp);
300#endif /* not HAVE_MKSTEMP */
301
302    /* remove existing temps (if any) */
303#ifdef HAVE_DB_SUFFIX
304    xsnprintf(maptdb, sizeof(maptdb), "%s.db", maptmp);
305    if (remove_file(maptdb) < 0) {
306      fprintf(stderr, "Can't remove existing temporary file; ");
307      perror(maptdb);
308      exit(1);
309    }
310#else /* not HAVE_DB_SUFFIX */
311    xsnprintf(maptpag, sizeof(maptpag), "%s.pag", maptmp);
312    xsnprintf(maptdir, sizeof(maptdir), "%s.dir", maptmp);
313    if (remove_file(maptpag) < 0 || remove_file(maptdir) < 0) {
314      fprintf(stderr, "Can't remove existing temporary files; %s and ", maptpag);
315      perror(maptdir);
316      exit(1);
317    }
318#endif /* not HAVE_DB_SUFFIX */
319
320    db = dbm_open(maptmp, O_RDWR|O_CREAT|O_EXCL, 0444);
321    if (!db) {
322      fprintf(stderr, "cannot initialize temporary database: %s", maptmp);
323      exit(1);
324    }
325  }
326
327  /* print db to stdout or to temp database */
328  error = read_file(mapf, mapsrc, db);
329  fclose(mapf);
330  if (error) {
331    if (printit)
332      fprintf(stderr, "Error reading source file  %s\n", mapsrc);
333    else
334      fprintf(stderr, "Error creating database map for %s\n", mapsrc);
335    exit(1);
336  }
337
338  if (printit)
339    exit(0);			/* nothing more to do */
340
341  /* if gets here, we wrote to a database */
342
343  dbm_close(db);
344  /* all went well */
345
346#ifdef HAVE_DB_SUFFIX
347  /* sizeof(map_name_db) is malloc'ed above */
348  xsnprintf(map_name_db, l, "%s.db", mapsrc);
349  if (rename(maptdb, map_name_db) < 0) {
350    fprintf(stderr, "Couldn't rename %s to ", maptdb);
351    perror(map_name_db);
352    /* Throw away the temporary map */
353    unlink(maptdb);
354    exit(1);
355  }
356#else /* not HAVE_DB_SUFFIX */
357  /* sizeof(map_name_{pag,dir}) are malloc'ed above */
358  xsnprintf(map_name_pag, l, "%s.pag", mapsrc);
359  xsnprintf(map_name_dir, l, "%s.dir", mapsrc);
360  if (rename(maptpag, map_name_pag) < 0) {
361    fprintf(stderr, "Couldn't rename %s to ", maptpag);
362    perror(map_name_pag);
363    /* Throw away the temporary map */
364    unlink(maptpag);
365    unlink(maptdir);
366    exit(1);
367  }
368  if (rename(maptdir, map_name_dir) < 0) {
369    fprintf(stderr, "Couldn't rename %s to ", maptdir);
370    perror(map_name_dir);
371    /* remove the (presumably bad) .pag file */
372    unlink(map_name_pag);
373    /* throw away remaining part of original map */
374    unlink(map_name_dir);
375    /* throw away the temporary map */
376    unlink(maptdir);
377    fprintf(stderr, "WARNING: existing map \"%s.{dir,pag}\" destroyed\n",
378	    mapsrc);
379    exit(1);
380  }
381#endif /* not HAVE_DB_SUFFIX */
382
383  exit(0);
384}
385
386#else /* not HAVE_MAP_NDBM */
387
388int
389main()
390{
391  fputs("mk-amd-map: This system does not support hashed database files\n", stderr);
392  exit(1);
393}
394
395#endif /* not HAVE_MAP_NDBM */
396