1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* A small freestanding program to build dbm databases from serial input. For
10 alias files, this program fulfils the function of the newaliases program used
11 by other mailers, but it can be used for other dbm data files too. It operates
12 by writing a new file or files, and then renaming; otherwise old entries can
13 never get flushed out.
15 This program is clever enough to cope with ndbm, which creates two files called
16 <name>.dir and <name>.pag, or with db, which creates a single file called
17 <name>.db. If native db is in use (USE_DB defined) or tdb is in use (USE_TDB
18 defined) there is no extension to the output filename. This is also handled. If
19 there are any other variants, the program won't cope.
21 The first argument to the program is the name of the serial file; the second
22 is the base name for the DBM file(s). When native db is in use, these must be
25 Input lines beginning with # are ignored, as are blank lines. Entries begin
26 with a key terminated by a colon or end of line or whitespace and continue with
27 indented lines. Keys may be quoted if they contain colons or whitespace or #
33 uschar * spool_directory = NULL; /* dummy for dbstuff.h */
35 /******************************************************************************/
36 /* dummies needed by Solaris build */
41 readconf_printtime(int t)
44 store_get_3(int size, BOOL tainted, const char *filename, int linenumber)
47 store_reset_3(void **ptr, int pool, const char *filename, int linenumber)
50 store_release_above_3(void *ptr, const char *func, int linenumber)
53 string_vformat_trc(gstring * g, const uschar * func, unsigned line,
54 unsigned size_limit, unsigned flags, const char *format, va_list ap)
57 string_sprintf_trc(const char * a, const uschar * b, unsigned c, ...)
60 string_format_trc(uschar * buf, int len, const uschar * func, unsigned line,
61 const char * fmt, ...)
65 struct global_flags f;
66 unsigned int log_selector[1];
68 BOOL split_spool_directory;
69 /******************************************************************************/
72 #define max_insize 20000
73 #define max_outsize 100000
75 /* This is global because it's defined in the headers and compilers grumble
76 if it is made static. */
78 const uschar *hex_digits = CUS"0123456789abcdef";
81 #ifdef STRERROR_FROM_ERRLIST
82 /* Some old-fashioned systems still around (e.g. SunOS4) don't have strerror()
83 in their libraries, but can provide the same facility by this simple
84 alternative function. */
89 if (n < 0 || n >= sys_nerr) return "unknown error number";
90 return sys_errlist[n];
92 #endif /* STRERROR_FROM_ERRLIST */
95 /* For Berkeley DB >= 2, we can define a function to be called in case of DB
96 errors. This should help with debugging strange DB problems, e.g. getting "File
97 exists" when you try to open a db file. The API changed at release 4.3. */
99 #if defined(USE_DB) && defined(DB_VERSION_STRING)
101 #if DB_VERSION_MAJOR > 4 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 3)
102 dbfn_bdb_error_callback(const DB_ENV *dbenv, const char *pfx, const char *msg)
106 dbfn_bdb_error_callback(const char *pfx, char *msg)
110 printf("Berkeley DB error: %s\n", msg);
116 /*************************************************
117 * Interpret escape sequence *
118 *************************************************/
120 /* This function is copied from the main Exim code.
123 pp points a pointer to the initiating "\" in the string;
124 the pointer gets updated to point to the final character
125 Returns: the value of the character escape
129 string_interpret_escape(const uschar **pp)
132 const uschar *p = *pp;
134 if (ch == '\0') return **pp;
135 if (isdigit(ch) && ch != '8' && ch != '9')
138 if (isdigit(p[1]) && p[1] != '8' && p[1] != '9')
140 ch = ch * 8 + *(++p) - '0';
141 if (isdigit(p[1]) && p[1] != '8' && p[1] != '9')
142 ch = ch * 8 + *(++p) - '0';
147 case 'n': ch = '\n'; break;
148 case 'r': ch = '\r'; break;
149 case 't': ch = '\t'; break;
155 Ustrchr(hex_digits, tolower(*(++p))) - hex_digits;
156 if (isxdigit(p[1])) ch = ch * 16 +
157 Ustrchr(hex_digits, tolower(*(++p))) - hex_digits;
166 /*************************************************
168 *************************************************/
170 int main(int argc, char **argv)
178 BOOL lowercase = TRUE;
181 BOOL lastdup = FALSE;
182 #if !defined (USE_DB) && !defined(USE_TDB) && !defined(USE_GDBM)
188 EXIM_DATUM key, content;
190 uschar keybuffer[256];
191 uschar temp_dbmname[512];
192 uschar real_dbmname[512];
194 uschar *buffer = malloc(max_outsize);
195 uschar *line = malloc(max_insize);
199 if (Ustrcmp(argv[arg], "-nolc") == 0) lowercase = FALSE;
200 else if (Ustrcmp(argv[arg], "-nowarn") == 0) warn = FALSE;
201 else if (Ustrcmp(argv[arg], "-lastdup") == 0) lastdup = TRUE;
202 else if (Ustrcmp(argv[arg], "-noduperr") == 0) duperr = FALSE;
203 else if (Ustrcmp(argv[arg], "-nozero") == 0) add_zero = 0;
211 printf("usage: exim_dbmbuild [-nolc] <source file> <dbm base name>\n");
215 if (Ustrcmp(argv[arg], "-") == 0) f = stdin; else
217 f = fopen(argv[arg], "rb");
220 printf("exim_dbmbuild: unable to open %s: %s\n", argv[arg], strerror(errno));
225 /* By default Berkeley db does not put extensions on... which
228 #if defined(USE_DB) || defined(USE_TDB) || defined(USE_GDBM)
229 if (Ustrcmp(argv[arg], argv[arg+1]) == 0)
231 printf("exim_dbmbuild: input and output filenames are the same\n");
236 /* Check length of filename; allow for adding .dbmbuild_temp and .db or
239 if (strlen(argv[arg+1]) > sizeof(temp_dbmname) - 20)
241 printf("exim_dbmbuild: output filename is ridiculously long\n");
245 Ustrcpy(temp_dbmname, US argv[arg+1]);
246 Ustrcat(temp_dbmname, US".dbmbuild_temp");
248 Ustrcpy(dirname, temp_dbmname);
249 if ((bptr = Ustrrchr(dirname, '/')))
252 Ustrcpy(dirname, US".");
254 /* It is apparently necessary to open with O_RDWR for this to work
255 with gdbm-1.7.3, though no reading is actually going to be done. */
257 EXIM_DBOPEN(temp_dbmname, dirname, O_RDWR|O_CREAT|O_EXCL, 0644, &d);
261 printf("exim_dbmbuild: unable to create %s: %s\n", temp_dbmname,
267 /* Unless using native db calls, see if we have created <name>.db; if not,
268 assume .dir & .pag */
270 #if !defined(USE_DB) && !defined(USE_TDB) && !defined(USE_GDBM)
271 sprintf(CS real_dbmname, "%s.db", temp_dbmname);
272 is_db = Ustat(real_dbmname, &statbuf) == 0;
275 /* Now do the business */
280 while (Ufgets(line, max_insize, f) != NULL)
283 int len = Ustrlen(line);
287 if (len >= max_insize - 1 && p[-1] != '\n')
289 printf("Overlong line read: max permitted length is %d\n", max_insize - 1);
294 if (line[0] == '#') continue;
295 while (p > line && isspace(p[-1])) p--;
297 if (line[0] == 0) continue;
299 /* A continuation line is valid only if there was a previous first
302 if (isspace(line[0]))
307 printf("Unexpected continuation line ignored\n%s\n\n", line);
310 while (isspace(*s)) s++;
313 if (bptr - buffer + p - s >= max_outsize - 1)
315 printf("Continued set of lines is too long: max permitted length is %d\n",
325 /* A first line must have a name followed by a colon or whitespace or
326 end of line, but first finish with a previous line. The key is lower
327 cased by default - this is what the newaliases program for sendmail does.
328 However, there's an option not to do this. */
338 EXIM_DATUM_INIT(content);
339 EXIM_DATUM_DATA(content) = CS buffer;
340 EXIM_DATUM_SIZE(content) = bptr - buffer + add_zero;
342 switch(rc = EXIM_DBPUTB(d, key, content))
348 case EXIM_DBPUTB_DUP:
349 if (warn) fprintf(stderr, "** Duplicate key \"%s\"\n", keybuffer);
351 if(duperr) yield = 1;
352 if (lastdup) EXIM_DBPUT(d, key, content);
356 fprintf(stderr, "Error %d while writing key %s: errno=%d\n", rc,
365 EXIM_DATUM_INIT(key);
366 EXIM_DATUM_DATA(key) = CS keybuffer;
368 /* Deal with quoted keys. Escape sequences always make one character
369 out of several, so we can re-build in place. */
375 while (*s != 0 && *s != '\"')
378 ? string_interpret_escape((const uschar **)&s)
382 if (*s != 0) s++; /* Past terminating " */
383 EXIM_DATUM_SIZE(key) = t - keystart + add_zero;
388 while (*s != 0 && *s != ':' && !isspace(*s)) s++;
389 EXIM_DATUM_SIZE(key) = s - keystart + add_zero;
392 if (EXIM_DATUM_SIZE(key) > 256)
394 printf("Keys longer than 255 characters cannot be handled\n");
401 for (i = 0; i < EXIM_DATUM_SIZE(key) - add_zero; i++)
402 keybuffer[i] = tolower(keystart[i]);
404 for (i = 0; i < EXIM_DATUM_SIZE(key) - add_zero; i++)
405 keybuffer[i] = keystart[i];
410 while (isspace(*s))s++;
414 while (isspace(*s))s++;
428 EXIM_DATUM_INIT(content);
429 EXIM_DATUM_DATA(content) = CS buffer;
430 EXIM_DATUM_SIZE(content) = bptr - buffer + add_zero;
432 switch(rc = EXIM_DBPUTB(d, key, content))
438 case EXIM_DBPUTB_DUP:
439 if (warn) fprintf(stderr, "** Duplicate key \"%s\"\n", keybuffer);
441 if (duperr) yield = 1;
442 if (lastdup) EXIM_DBPUT(d, key, content);
446 fprintf(stderr, "Error %d while writing key %s: errno=%d\n", rc,
453 /* Close files, rename or abandon the temporary files, and exit */
460 /* If successful, output the number of entries and rename the temporary
463 if (yield == 0 || yield == 1)
465 printf("%d entr%s written\n", count, (count == 1)? "y" : "ies");
468 printf("%d duplicate key%s \n", dupcount, (dupcount > 1)? "s" : "");
471 #if defined(USE_DB) || defined(USE_TDB) || defined(USE_GDBM)
472 Ustrcpy(real_dbmname, temp_dbmname);
473 Ustrcpy(buffer, US argv[arg+1]);
474 if (Urename(real_dbmname, buffer) != 0)
476 printf("Unable to rename %s as %s\n", real_dbmname, buffer);
481 /* Rename a single .db file */
485 sprintf(CS real_dbmname, "%s.db", temp_dbmname);
486 sprintf(CS buffer, "%s.db", argv[arg+1]);
487 if (Urename(real_dbmname, buffer) != 0)
489 printf("Unable to rename %s as %s\n", real_dbmname, buffer);
494 /* Rename .dir and .pag files */
498 sprintf(CS real_dbmname, "%s.dir", temp_dbmname);
499 sprintf(CS buffer, "%s.dir", argv[arg+1]);
500 if (Urename(real_dbmname, buffer) != 0)
502 printf("Unable to rename %s as %s\n", real_dbmname, buffer);
506 sprintf(CS real_dbmname, "%s.pag", temp_dbmname);
507 sprintf(CS buffer, "%s.pag", argv[arg+1]);
508 if (Urename(real_dbmname, buffer) != 0)
510 printf("Unable to rename %s as %s\n", real_dbmname, buffer);
515 #endif /* USE_DB || USE_TDB || USE_GDBM */
518 /* Otherwise unlink the temporary files. */
522 printf("dbmbuild abandoned\n");
523 #if defined(USE_DB) || defined(USE_TDB) || defined(USE_GDBM)
524 /* We created it, so safe to delete despite the name coming from outside */
525 /* coverity[tainted_string] */
526 Uunlink(temp_dbmname);
530 sprintf(CS real_dbmname, "%s.db", temp_dbmname);
531 Uunlink(real_dbmname);
535 sprintf(CS real_dbmname, "%s.dir", temp_dbmname);
536 Uunlink(real_dbmname);
537 sprintf(CS real_dbmname, "%s.pag", temp_dbmname);
538 Uunlink(real_dbmname);
540 #endif /* USE_DB || USE_TDB */
546 /* End of exim_dbmbuild.c */