1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Interface to an Oracle database. This code was originally supplied by
9 Paul Kelly, but I have hacked it around for various reasons, and tried to add
10 some comments from my position of Oracle ignorance. */
16 /* The Oracle system headers */
22 #define PARSE_NO_DEFER 0 /* parse straight away */
23 #define PARSE_V7_LNG 2
24 #define MAX_ITEM_BUFFER_SIZE 1024 /* largest size of a cell of data */
25 #define MAX_SELECT_LIST_SIZE 32 /* maximum number of columns (not rows!) */
27 /* Paul's comment on this was "change this to 512 for 64bit cpu", but I don't
28 understand why. The Oracle manual just asks for 256 bytes.
30 That was years ago. Jin Choi suggested (March 2007) that this change should
31 be made in the source, as at worst it wastes 256 bytes, and it saves people
32 having to discover about this for themselves as more and more systems are
33 64-bit. So I have changed 256 to 512. */
37 /* Internal/external datatype codes */
46 /* ORACLE error codes used in demonstration programs */
48 #define VAR_NOT_IN_LIST 1007
49 #define NO_DATA_FOUND 1403
51 typedef struct Ora_Describe {
54 sb1 buf[MAX_ITEM_BUFFER_SIZE];
62 typedef struct Ora_Define {
63 ub1 buf[MAX_ITEM_BUFFER_SIZE];
67 ub2 col_retlen, col_retcode;
70 /* Structure and anchor for caching connections. */
72 typedef struct oracle_connection {
73 struct oracle_connection *next;
75 struct cda_def *handle;
79 static oracle_connection *oracle_connections = NULL;
85 /*************************************************
86 * Set up message after error *
87 *************************************************/
89 /* Sets up a message from a local string plus whatever Oracle gives.
92 oracle_handle the handle of the connection
94 msg local text message
98 oracle_error(struct cda_def *oracle_handle, int rc, uschar *msg)
101 oerhms(oracle_handle, rc, tmp, sizeof(tmp));
102 return string_sprintf("ORACLE %s: %s", msg, tmp);
107 /*************************************************
108 * Describe and define the select list items *
109 *************************************************/
111 /* Figures out sizes, types, and numbers.
116 desc descriptions put here
118 Returns: number of fields
122 describe_define(Cda_Def *cda, Ora_Define *def, Ora_Describe *desc)
124 sword col, deflen, deftyp;
126 static sword numwidth = 8;
128 /* Describe the select-list items. */
130 for (col = 0; col < MAX_SELECT_LIST_SIZE; col++)
132 desc[col].buflen = MAX_ITEM_BUFFER_SIZE;
134 if (odescr(cda, col + 1, &desc[col].dbsize,
135 &desc[col].dbtype, &desc[col].buf[0],
136 &desc[col].buflen, &desc[col].dsize,
137 &desc[col].precision, &desc[col].scale,
138 &desc[col].nullok) != 0)
140 /* Break on end of select list. */
141 if (cda->rc == VAR_NOT_IN_LIST) break; else return -1;
144 /* Adjust sizes and types for display, handling NUMBER with scale as float. */
146 if (desc[col].dbtype == NUMBER_TYPE)
148 desc[col].dbsize = numwidth;
149 if (desc[col].scale != 0)
151 defptr = (ub1 *)&def[col].flt_buf;
152 deflen = (sword) sizeof(float);
154 desc[col].dbtype = FLOAT_TYPE;
158 defptr = (ub1 *)&def[col].int_buf;
159 deflen = (sword) sizeof(sword);
161 desc[col].dbtype = INT_TYPE;
166 if (desc[col].dbtype == DATE_TYPE)
167 desc[col].dbsize = 9;
168 if (desc[col].dbtype == ROWID_TYPE)
169 desc[col].dbsize = 18;
170 defptr = def[col].buf;
171 deflen = desc[col].dbsize > MAX_ITEM_BUFFER_SIZE ?
172 MAX_ITEM_BUFFER_SIZE : desc[col].dbsize + 1;
173 deftyp = STRING_TYPE;
174 desc[col].dbtype = STRING_TYPE;
177 /* Define an output variable */
179 if (odefin(cda, col + 1,
180 defptr, deflen, deftyp,
181 -1, &def[col].indp, (text *) 0, -1, -1,
182 &def[col].col_retlen,
183 &def[col].col_retcode) != 0)
185 } /* Loop for each column */
192 /*************************************************
194 *************************************************/
196 /* See local README for interface description. */
199 oracle_open(uschar *filename, uschar **errmsg)
201 return (void *)(1); /* Just return something non-null */
206 /*************************************************
208 *************************************************/
210 /* See local README for interface description. */
215 oracle_connection *cn;
216 while ((cn = oracle_connections) != NULL)
218 oracle_connections = cn->next;
219 DEBUG(D_lookup) debug_printf_indent("close ORACLE connection: %s\n", cn->server);
226 /*************************************************
227 * Internal search function *
228 *************************************************/
230 /* This function is called from the find entry point to do the search for a
234 query the query string
235 server the server string
236 resultptr where to store the result
237 errmsg where to point an error message
238 defer_break TRUE if no more servers are to be tried after DEFER
240 The server string is of the form "host/dbname/user/password", for compatibility
241 with MySQL and pgsql, but at present, the dbname is not used. This string is in
242 a nextinlist temporary buffer, so can be overwritten.
244 Returns: OK, FAIL, or DEFER
248 perform_oracle_search(uschar *query, uschar *server, uschar **resultptr,
249 uschar **errmsg, BOOL *defer_break)
252 struct cda_def *oracle_handle = NULL;
253 Ora_Describe *desc = NULL;
254 Ora_Define *def = NULL;
258 unsigned int num_fields = 0;
259 gstring * result = NULL;
260 oracle_connection *cn = NULL;
261 uschar *server_copy = NULL;
264 /* Disaggregate the parameters from the server argument. The order is host,
265 database, user, password. We can write to the string, since it is in a
266 nextinlist temporary buffer. The copy of the string that is used for caching
267 has the password removed. This copy is also used for debugging output. */
269 for (int i = 3; i > 0; i--)
271 uschar *pp = Ustrrchr(server, '/');
274 *errmsg = string_sprintf("incomplete ORACLE server data: %s", server);
280 if (i == 3) server_copy = string_copy(server); /* sans password */
282 sdata[0] = server; /* What's left at the start */
284 /* If the database is the empty string, set it NULL - the query must then
287 if (sdata[1][0] == 0) sdata[1] = NULL;
289 /* See if we have a cached connection to the server */
291 for (cn = oracle_connections; cn; cn = cn->next)
292 if (strcmp(cn->server, server_copy) == 0)
294 oracle_handle = cn->handle;
299 /* If no cached connection, we must set one up */
303 DEBUG(D_lookup) debug_printf_indent("ORACLE new connection: host=%s database=%s "
304 "user=%s\n", sdata[0], sdata[1], sdata[2]);
306 /* Get store for a new connection, initialize it, and connect to the server */
308 oracle_handle = store_get(sizeof(struct cda_def), FALSE);
309 hda = store_get(HDA_SIZE, FALSE);
310 memset(hda,'\0',HDA_SIZE);
313 * Perform a default (blocking) login
315 * sdata[0] = tnsname (service name - typically host name)
316 * sdata[1] = dbname - not used at present
317 * sdata[2] = username
321 if(olog(oracle_handle, hda, sdata[2], -1, sdata[3], -1, sdata[0], -1,
322 (ub4)OCI_LM_DEF) != 0)
324 *errmsg = oracle_error(oracle_handle, oracle_handle->rc,
325 US"connection failed");
326 *defer_break = FALSE;
327 goto ORACLE_EXIT_NO_VALS;
330 /* Add the connection to the cache */
332 cn = store_get(sizeof(oracle_connection), FALSE);
333 cn->server = server_copy;
334 cn->handle = oracle_handle;
335 cn->next = oracle_connections;
337 oracle_connections = cn;
340 /* Else use a previously cached connection - we can write to the server string
341 to obliterate the password because it is in a nextinlist temporary buffer. */
346 debug_printf_indent("ORACLE using cached connection for %s\n", server_copy);
349 /* We have a connection. Open a cursor and run the query */
351 cda = store_get(sizeof(Cda_Def), FALSE);
353 if (oopen(cda, oracle_handle, (text *)0, -1, -1, (text *)0, -1) != 0)
355 *errmsg = oracle_error(oracle_handle, cda->rc, "failed to open cursor");
356 *defer_break = FALSE;
357 goto ORACLE_EXIT_NO_VALS;
360 if (oparse(cda, (text *)query, (sb4) -1,
361 (sword)PARSE_NO_DEFER, (ub4)PARSE_V7_LNG) != 0)
363 *errmsg = oracle_error(oracle_handle, cda->rc, "query failed");
364 *defer_break = FALSE;
366 goto ORACLE_EXIT_NO_VALS;
369 /* Find the number of fields returned and sort out their types. If the number
370 is one, we don't add field names to the data. Otherwise we do. */
372 def = store_get(sizeof(Ora_Define)*MAX_SELECT_LIST_SIZE, FALSE);
373 desc = store_get(sizeof(Ora_Describe)*MAX_SELECT_LIST_SIZE, FALSE);
375 if ((num_fields = describe_define(cda,def,desc)) == -1)
377 *errmsg = oracle_error(oracle_handle, cda->rc, "describe_define failed");
378 *defer_break = FALSE;
384 *errmsg = oracle_error(oracle_handle, cda->rc, "oexec failed");
385 *defer_break = FALSE;
389 /* Get the fields and construct the result string. If there is more than one
390 row, we insert '\n' between them. */
392 while (cda->rc != NO_DATA_FOUND) /* Loop for each row */
395 if(cda->rc == NO_DATA_FOUND) break;
397 if (result) result = string_catn(result, "\n", 1);
399 /* Single field - just add on the data */
402 result = string_catn(result, def[0].buf, def[0].col_retlen);
404 /* Multiple fields - precede by file name, removing {lead,trail}ing WS */
406 else for (int i = 0; i < num_fields; i++)
409 uschar *s = US desc[i].buf;
411 while (*s != 0 && isspace(*s)) s++;
413 while (slen > 0 && isspace(s[slen-1])) slen--;
414 result = string_catn(result, s, slen);
415 result = string_catn(result, US"=", 1);
417 /* int and float type won't ever need escaping. Otherwise, quote the value
418 if it contains spaces or is empty. */
420 if (desc[i].dbtype != INT_TYPE && desc[i].dbtype != FLOAT_TYPE &&
421 (def[i].buf[0] == 0 || strchr(def[i].buf, ' ') != NULL))
423 result = string_catn(result, "\"", 1);
424 for (int j = 0; j < def[i].col_retlen; j++)
426 if (def[i].buf[j] == '\"' || def[i].buf[j] == '\\')
427 result = string_catn(result, "\\", 1);
428 result = string_catn(result, def[i].buf+j, 1);
430 result = string_catn(result, "\"", 1);
433 else switch(desc[i].dbtype)
436 result = string_cat(result, string_sprintf("%d", def[i].int_buf));
440 result = string_cat(result, string_sprintf("%f", def[i].flt_buf));
444 result = string_catn(result, def[i].buf, def[i].col_retlen);
448 *errmsg = string_sprintf("ORACLE: unknown field type %d", desc[i].dbtype);
449 *defer_break = FALSE;
454 result = string_catn(result, " ", 1);
458 /* If result is NULL then no data has been found and so we return FAIL.
459 Otherwise, we must terminate the string which has been built; string_cat()
460 always leaves enough room for a terminating zero. */
465 *errmsg = "ORACLE: no data found";
468 gstring_release_unused(result);
470 /* Get here by goto from various error checks. */
474 /* Close the cursor; don't close the connection, as it is cached. */
480 /* Non-NULL result indicates a successful result */
484 *resultptr = string_from_gstring(result);
489 DEBUG(D_lookup) debug_printf_indent("%s\n", *errmsg);
490 return yield; /* FAIL or DEFER */
497 /*************************************************
499 *************************************************/
501 /* See local README for interface description. The handle and filename
502 arguments are not used. Loop through a list of servers while the query is
503 deferred with a retryable error. */
506 oracle_find(void *handle, uschar *filename, uschar *query, int length,
507 uschar **result, uschar **errmsg, uint *do_cache)
511 uschar *list = oracle_servers;
514 do_cache = do_cache; /* Placate picky compilers */
516 DEBUG(D_lookup) debug_printf_indent("ORACLE query: %s\n", query);
518 while ((server = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
521 int rc = perform_oracle_search(query, server, result, errmsg, &defer_break);
522 if (rc != DEFER || defer_break) return rc;
525 if (oracle_servers == NULL)
526 *errmsg = "no ORACLE servers defined (oracle_servers option)";
533 /*************************************************
534 * Quote entry point *
535 *************************************************/
537 /* The only characters that need to be quoted (with backslash) are newline,
538 tab, carriage return, backspace, backslash itself, and the quote characters.
539 Percent and underscore are not escaped. They are only special in contexts where
540 they can be wild cards, and this isn't usually the case for data inserted from
541 messages, since that isn't likely to be treated as a pattern of any kind.
544 s the string to be quoted
545 opt additional option text or NULL if none
547 Returns: the processed string or NULL for a bad option
551 oracle_quote(uschar *s, uschar *opt)
558 if (opt != NULL) return NULL; /* No options are recognized */
560 while ((c = *t++) != 0)
561 if (strchr("\n\t\r\b\'\"\\", c) != NULL) count++;
563 if (count == 0) return s;
564 t = quoted = store_get((int)strlen(s) + count + 1, is_tainted(s));
566 while ((c = *s++) != 0)
568 if (strchr("\n\t\r\b\'\"\\", c) != NULL)
573 case '\n': *t++ = 'n';
575 case '\t': *t++ = 't';
577 case '\r': *t++ = 'r';
579 case '\b': *t++ = 'b';
593 /*************************************************
594 * Version reporting entry point *
595 *************************************************/
597 /* See local README for interface description. */
599 #include "../version.h"
602 oracle_version_report(FILE *f)
605 fprintf(f, "Library version: Oracle: Exim version %s\n", EXIM_VERSION_STR);
610 static lookup_info _lookup_info = {
611 US"oracle", /* lookup name */
612 lookup_querystyle, /* query-style lookup */
613 oracle_open, /* open function */
614 NULL, /* check function */
615 oracle_find, /* find function */
616 NULL, /* no close function */
617 oracle_tidy, /* tidy function */
618 oracle_quote, /* quoting function */
619 oracle_version_report /* version reporting */
623 #define oracle_lookup_module_info _lookup_module_info
626 static lookup_info *_lookup_list[] = { &_lookup_info };
627 lookup_module_info oracle_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
629 /* End of lookups/oracle.c */