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. */
8 /* The code in this module was contributed by Ard Biesheuvel. */
11 #include "lf_functions.h"
13 #include <ibase.h> /* The system header */
15 /* Structure and anchor for caching connections. */
17 typedef struct ibase_connection {
18 struct ibase_connection *next;
24 static ibase_connection *ibase_connections = NULL;
28 /*************************************************
30 *************************************************/
32 /* See local README for interface description. */
34 static void *ibase_open(uschar * filename, uschar ** errmsg)
36 return (void *) (1); /* Just return something non-null */
41 /*************************************************
43 *************************************************/
45 /* See local README for interface description. */
47 static void ibase_tidy(void)
50 ISC_STATUS status[20];
52 while ((cn = ibase_connections) != NULL) {
53 ibase_connections = cn->next;
54 DEBUG(D_lookup) debug_printf_indent("close Interbase connection: %s\n",
56 isc_commit_transaction(status, &cn->transh);
57 isc_detach_database(status, &cn->dbh);
61 static int fetch_field(char *buffer, int buffer_size, XSQLVAR * var)
63 if (buffer_size < var->sqllen)
66 switch (var->sqltype & ~1) {
68 strncpy(buffer, &var->sqldata[2], *(short *) var->sqldata);
69 return *(short *) var->sqldata;
71 strncpy(buffer, var->sqldata, var->sqllen);
74 return sprintf(buffer, "%d", *(short *) var->sqldata);
76 return sprintf(buffer, "%ld", *(ISC_LONG *) var->sqldata);
79 return sprintf(buffer, "%lld", *(ISC_INT64 *) var->sqldata);
87 /*************************************************
88 * Internal search function *
89 *************************************************/
91 /* This function is called from the find entry point to do the search for a
95 query the query string
96 server the server string
97 resultptr where to store the result
98 errmsg where to point an error message
99 defer_break TRUE if no more servers are to be tried after DEFER
101 The server string is of the form "host:dbname|user|password". The host can be
102 host:port. This string is in a nextinlist temporary buffer, so can be
105 Returns: OK, FAIL, or DEFER
109 perform_ibase_search(uschar * query, uschar * server, uschar ** resultptr,
110 uschar ** errmsg, BOOL * defer_break)
112 isc_stmt_handle stmth = NULL;
119 ISC_STATUS status[20], *statusp = status;
123 ibase_connection *cn;
124 uschar *server_copy = NULL;
127 /* Disaggregate the parameters from the server argument. The order is host,
128 database, user, password. We can write to the string, since it is in a
129 nextinlist temporary buffer. The copy of the string that is used for caching
130 has the password removed. This copy is also used for debugging output. */
132 for (int i = 2; i > 0; i--)
134 uschar *pp = Ustrrchr(server, '|');
138 *errmsg = string_sprintf("incomplete Interbase server data: %s",
139 (i == 3) ? server : server_copy);
146 server_copy = string_copy(server); /* sans password */
148 sdata[0] = server; /* What's left at the start */
150 /* See if we have a cached connection to the server */
152 for (cn = ibase_connections; cn != NULL; cn = cn->next)
153 if (Ustrcmp(cn->server, server_copy) == 0)
156 /* Use a previously cached connection ? */
160 static char db_info_options[] = { isc_info_base_level };
162 /* test if the connection is alive */
163 if (isc_database_info(status, &cn->dbh, sizeof(db_info_options),
164 db_info_options, sizeof(buffer), buffer))
166 /* error occurred: assume connection is down */
169 ("Interbase cleaning up cached connection: %s\n",
171 isc_detach_database(status, &cn->dbh);
174 DEBUG(D_lookup) debug_printf_indent("Interbase using cached connection for %s\n",
179 cn = store_get(sizeof(ibase_connection), FALSE);
180 cn->server = server_copy;
183 cn->next = ibase_connections;
184 ibase_connections = cn;
187 /* If no cached connection, we must set one up. */
189 if (cn->dbh == NULL || cn->transh == NULL)
193 static char trans_options[] =
194 { isc_tpb_version3, isc_tpb_read, isc_tpb_read_committed,
198 /* Construct the database parameter buffer. */
200 *dpb++ = isc_dpb_version1;
201 *dpb++ = isc_dpb_user_name;
202 *dpb++ = strlen(sdata[1]);
203 for (char * p = sdata[1]; *p;)
205 *dpb++ = isc_dpb_password;
206 *dpb++ = strlen(sdata[2]);
207 for (char * p = sdata[2]; *p;)
209 dpb_length = dpb - buffer;
212 debug_printf_indent("new Interbase connection: database=%s user=%s\n",
215 /* Connect to the database */
216 if (isc_attach_database
217 (status, 0, sdata[0], &cn->dbh, dpb_length, buffer))
219 isc_interprete(buffer, &statusp);
221 string_sprintf("Interbase attach() failed: %s", buffer);
222 *defer_break = FALSE;
226 /* Now start a read-only read-committed transaction */
227 if (isc_start_transaction
228 (status, &cn->transh, 1, &cn->dbh, sizeof(trans_options),
231 isc_interprete(buffer, &statusp);
232 isc_detach_database(status, &cn->dbh);
234 string_sprintf("Interbase start_transaction() failed: %s",
236 *defer_break = FALSE;
242 if (isc_dsql_allocate_statement(status, &cn->dbh, &stmth))
244 isc_interprete(buffer, &statusp);
246 string_sprintf("Interbase alloc_statement() failed: %s",
248 *defer_break = FALSE;
252 /* Lacking any information, assume that the data is untainted */
253 reset_point = store_mark();
254 out_sqlda = store_get(XSQLDA_LENGTH(1), FALSE);
255 out_sqlda->version = SQLDA_VERSION1;
259 (status, &cn->transh, &stmth, 0, query, 1, out_sqlda))
261 isc_interprete(buffer, &statusp);
262 reset_point = store_reset(reset_point);
265 string_sprintf("Interbase prepare_statement() failed: %s",
267 *defer_break = FALSE;
271 /* re-allocate the output structure if there's more than one field */
272 if (out_sqlda->sqln < out_sqlda->sqld)
274 XSQLDA *new_sqlda = store_get(XSQLDA_LENGTH(out_sqlda->sqld), FALSE);
275 if (isc_dsql_describe
276 (status, &stmth, out_sqlda->version, new_sqlda))
278 isc_interprete(buffer, &statusp);
279 isc_dsql_free_statement(status, &stmth, DSQL_drop);
280 reset_point = store_reset(reset_point);
282 *errmsg = string_sprintf("Interbase describe_statement() failed: %s",
284 *defer_break = FALSE;
287 out_sqlda = new_sqlda;
290 /* allocate storage for every returned field */
291 for (i = 0, var = out_sqlda->sqlvar; i < out_sqlda->sqld; i++, var++)
293 switch (var->sqltype & ~1)
296 var->sqldata = CS store_get(sizeof(char) * var->sqllen + 2, FALSE);
299 var->sqldata = CS store_get(sizeof(char) * var->sqllen, FALSE);
302 var->sqldata = CS store_get(sizeof(short), FALSE);
305 var->sqldata = CS store_get(sizeof(ISC_LONG), FALSE);
309 var->sqldata = CS store_get(sizeof(ISC_INT64), FALSE);
313 var->sqldata = CS store_get(sizeof(float), FALSE);
316 var->sqldata = CS store_get(sizeof(double), FALSE);
320 var->sqldata = CS store_get(sizeof(ISC_QUAD), FALSE);
324 var->sqldata = CS store_get(sizeof(ISC_TIMESTAMP), FALSE);
327 var->sqldata = CS store_get(sizeof(ISC_DATE), FALSE);
330 var->sqldata = CS store_get(sizeof(ISC_TIME), FALSE);
334 if (var->sqltype & 1)
335 var->sqlind = (short *) store_get(sizeof(short), FALSE);
338 /* finally, we're ready to execute the statement */
340 (status, &cn->transh, &stmth, out_sqlda->version, NULL))
342 isc_interprete(buffer, &statusp);
343 *errmsg = string_sprintf("Interbase describe_statement() failed: %s",
345 isc_dsql_free_statement(status, &stmth, DSQL_drop);
346 *defer_break = FALSE;
350 while (isc_dsql_fetch(status, &stmth, out_sqlda->version, out_sqlda) != 100L)
352 /* check if an error occurred */
353 if (status[0] & status[1])
355 isc_interprete(buffer, &statusp);
357 string_sprintf("Interbase fetch() failed: %s", buffer);
358 isc_dsql_free_statement(status, &stmth, DSQL_drop);
359 *defer_break = FALSE;
364 result = string_catn(result, US "\n", 1);
366 /* Find the number of fields returned. If this is one, we don't add field
367 names to the data. Otherwise we do. */
368 if (out_sqlda->sqld == 1)
370 if (out_sqlda->sqlvar[0].sqlind == NULL || *out_sqlda->sqlvar[0].sqlind != -1) /* NULL value yields nothing */
371 result = string_catn(result, US buffer,
372 fetch_field(buffer, sizeof(buffer),
373 &out_sqlda->sqlvar[0]));
377 for (int i = 0; i < out_sqlda->sqld; i++)
379 int len = fetch_field(buffer, sizeof(buffer), &out_sqlda->sqlvar[i]);
381 result = string_catn(result, US out_sqlda->sqlvar[i].aliasname,
382 out_sqlda->sqlvar[i].aliasname_length);
383 result = string_catn(result, US "=", 1);
385 /* Quote the value if it contains spaces or is empty */
387 if (*out_sqlda->sqlvar[i].sqlind == -1) /* NULL value */
388 result = string_catn(result, US "\"\"", 2);
390 else if (buffer[0] == 0 || Ustrchr(buffer, ' ') != NULL)
392 result = string_catn(result, US "\"", 1);
393 for (int j = 0; j < len; j++)
395 if (buffer[j] == '\"' || buffer[j] == '\\')
396 result = string_cat(result, US "\\", 1);
397 result = string_cat(result, US buffer + j, 1);
399 result = string_catn(result, US "\"", 1);
402 result = string_catn(result, US buffer, len);
403 result = string_catn(result, US " ", 1);
407 /* If result is NULL then no data has been found and so we return FAIL.
408 Otherwise, we must terminate the string which has been built; string_cat()
409 always leaves enough room for a terminating zero. */
414 *errmsg = US "Interbase: no data found";
417 gstring_release_unused(result);
420 /* Get here by goto from various error checks. */
425 isc_dsql_free_statement(status, &stmth, DSQL_drop);
427 /* Non-NULL result indicates a successful result */
431 *resultptr = string_from_gstring(result);
436 DEBUG(D_lookup) debug_printf_indent("%s\n", *errmsg);
437 return yield; /* FAIL or DEFER */
444 /*************************************************
446 *************************************************/
448 /* See local README for interface description. The handle and filename
449 arguments are not used. Loop through a list of servers while the query is
450 deferred with a retryable error. */
453 ibase_find(void *handle, uschar * filename, uschar * query, int length,
454 uschar ** result, uschar ** errmsg, uint *do_cache)
458 uschar *list = ibase_servers;
461 /* Keep picky compilers happy */
464 DEBUG(D_lookup) debug_printf_indent("Interbase query: %s\n", query);
467 string_nextinlist(&list, &sep, buffer,
468 sizeof(buffer))) != NULL) {
469 BOOL defer_break = FALSE;
470 int rc = perform_ibase_search(query, server, result, errmsg,
472 if (rc != DEFER || defer_break)
476 if (ibase_servers == NULL)
477 *errmsg = US "no Interbase servers defined (ibase_servers option)";
484 /*************************************************
485 * Quote entry point *
486 *************************************************/
488 /* The only characters that need to be quoted (with backslash) are newline,
489 tab, carriage return, backspace, backslash itself, and the quote characters.
490 Percent, and underscore and not escaped. They are only special in contexts
491 where they can be wild cards, and this isn't usually the case for data inserted
492 from messages, since that isn't likely to be treated as a pattern of any kind.
493 Sadly, MySQL doesn't seem to behave like other programs. If you use something
494 like "where id="ab\%cd" it does not treat the string as "ab%cd". So you really
495 can't quote "on spec".
498 s the string to be quoted
499 opt additional option text or NULL if none
501 Returns: the processed string or NULL for a bad option
504 static uschar *ibase_quote(uschar * s, uschar * opt)
512 return NULL; /* No options recognized */
514 while ((c = *t++) != 0)
515 if (Ustrchr("\n\t\r\b\'\"\\", c) != NULL)
520 t = quoted = store_get(Ustrlen(s) + count + 1, FALSE);
522 while ((c = *s++) != 0) {
523 if (Ustrchr("'", c) != NULL) {
528 case '\n': *t++ = 'n';
530 case '\t': *t++ = 't';
532 case '\r': *t++ = 'r';
534 case '\b': *t++ = 'b';
548 /*************************************************
549 * Version reporting entry point *
550 *************************************************/
552 /* See local README for interface description. */
554 #include "../version.h"
557 ibase_version_report(FILE *f)
560 fprintf(f, "Library version: ibase: Exim version %s\n", EXIM_VERSION_STR);
565 static lookup_info _lookup_info = {
566 US"ibase", /* lookup name */
567 lookup_querystyle, /* query-style lookup */
568 ibase_open, /* open function */
569 NULL, /* no check function */
570 ibase_find, /* find function */
571 NULL, /* no close function */
572 ibase_tidy, /* tidy function */
573 ibase_quote, /* quoting function */
574 ibase_version_report /* version reporting */
578 #define ibase_lookup_module_info _lookup_module_info
581 static lookup_info *_lookup_list[] = { &_lookup_info };
582 lookup_module_info ibase_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
584 /* End of lookups/ibase.c */