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+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2015 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Interface to an Oracle database. This code was originally supplied by
+Paul Kelly, but I have hacked it around for various reasons, and tried to add
+some comments from my position of Oracle ignorance. */
+
+
+#include "../exim.h"
+
+
+/* The Oracle system headers */
+
+#include <oratypes.h>
+#include <ocidfn.h>
+#include <ocikpr.h>
+
+#define PARSE_NO_DEFER 0 /* parse straight away */
+#define PARSE_V7_LNG 2
+#define MAX_ITEM_BUFFER_SIZE 1024 /* largest size of a cell of data */
+#define MAX_SELECT_LIST_SIZE 32 /* maximum number of columns (not rows!) */
+
+/* Paul's comment on this was "change this to 512 for 64bit cpu", but I don't
+understand why. The Oracle manual just asks for 256 bytes.
+
+That was years ago. Jin Choi suggested (March 2007) that this change should
+be made in the source, as at worst it wastes 256 bytes, and it saves people
+having to discover about this for themselves as more and more systems are
+64-bit. So I have changed 256 to 512. */
+
+#define HDA_SIZE 512
+
+/* Internal/external datatype codes */
+
+#define NUMBER_TYPE 2
+#define INT_TYPE 3
+#define FLOAT_TYPE 4
+#define STRING_TYPE 5
+#define ROWID_TYPE 11
+#define DATE_TYPE 12
+
+/* ORACLE error codes used in demonstration programs */
+
+#define VAR_NOT_IN_LIST 1007
+#define NO_DATA_FOUND 1403
+
+typedef struct Ora_Describe {
+ sb4 dbsize;
+ sb2 dbtype;
+ sb1 buf[MAX_ITEM_BUFFER_SIZE];
+ sb4 buflen;
+ sb4 dsize;
+ sb2 precision;
+ sb2 scale;
+ sb2 nullok;
+} Ora_Describe;
+
+typedef struct Ora_Define {
+ ub1 buf[MAX_ITEM_BUFFER_SIZE];
+ float flt_buf;
+ sword int_buf;
+ sb2 indp;
+ ub2 col_retlen, col_retcode;
+} Ora_Define;
+
+/* Structure and anchor for caching connections. */
+
+typedef struct oracle_connection {
+ struct oracle_connection *next;
+ uschar *server;
+ struct cda_def *handle;
+ void *hda_mem;
+} oracle_connection;
+
+static oracle_connection *oracle_connections = NULL;
+
+
+
+
+
+/*************************************************
+* Set up message after error *
+*************************************************/
+
+/* Sets up a message from a local string plus whatever Oracle gives.
+
+Arguments:
+ oracle_handle the handle of the connection
+ rc the return code
+ msg local text message
+*/
+
+static uschar *
+oracle_error(struct cda_def *oracle_handle, int rc, uschar *msg)
+{
+uschar tmp[1024];
+oerhms(oracle_handle, rc, tmp, sizeof(tmp));
+return string_sprintf("ORACLE %s: %s", msg, tmp);
+}
+
+
+
+/*************************************************
+* Describe and define the select list items *
+*************************************************/
+
+/* Figures out sizes, types, and numbers.
+
+Arguments:
+ cda the connection
+ def
+ desc descriptions put here
+
+Returns: number of fields
+*/
+
+static sword
+describe_define(Cda_Def *cda, Ora_Define *def, Ora_Describe *desc)
+{
+sword col, deflen, deftyp;
+static ub1 *defptr;
+static sword numwidth = 8;
+
+/* Describe the select-list items. */
+
+for (col = 0; col < MAX_SELECT_LIST_SIZE; col++)
+ {
+ desc[col].buflen = MAX_ITEM_BUFFER_SIZE;
+
+ if (odescr(cda, col + 1, &desc[col].dbsize,
+ &desc[col].dbtype, &desc[col].buf[0],
+ &desc[col].buflen, &desc[col].dsize,
+ &desc[col].precision, &desc[col].scale,
+ &desc[col].nullok) != 0)
+ {
+ /* Break on end of select list. */
+ if (cda->rc == VAR_NOT_IN_LIST) break; else return -1;
+ }
+
+ /* Adjust sizes and types for display, handling NUMBER with scale as float. */
+
+ if (desc[col].dbtype == NUMBER_TYPE)
+ {
+ desc[col].dbsize = numwidth;
+ if (desc[col].scale != 0)
+ {
+ defptr = (ub1 *)&def[col].flt_buf;
+ deflen = (sword) sizeof(float);
+ deftyp = FLOAT_TYPE;
+ desc[col].dbtype = FLOAT_TYPE;
+ }
+ else
+ {
+ defptr = (ub1 *)&def[col].int_buf;
+ deflen = (sword) sizeof(sword);
+ deftyp = INT_TYPE;
+ desc[col].dbtype = INT_TYPE;
+ }
+ }
+ else
+ {
+ if (desc[col].dbtype == DATE_TYPE)
+ desc[col].dbsize = 9;
+ if (desc[col].dbtype == ROWID_TYPE)
+ desc[col].dbsize = 18;
+ defptr = def[col].buf;
+ deflen = desc[col].dbsize > MAX_ITEM_BUFFER_SIZE ?
+ MAX_ITEM_BUFFER_SIZE : desc[col].dbsize + 1;
+ deftyp = STRING_TYPE;
+ desc[col].dbtype = STRING_TYPE;
+ }
+
+ /* Define an output variable */
+
+ if (odefin(cda, col + 1,
+ defptr, deflen, deftyp,
+ -1, &def[col].indp, (text *) 0, -1, -1,
+ &def[col].col_retlen,
+ &def[col].col_retcode) != 0)
+ return -1;
+ } /* Loop for each column */
+
+return col;
+}
+
+
+
+/*************************************************
+* Open entry point *
+*************************************************/
+
+/* See local README for interface description. */
+
+static void *
+oracle_open(uschar *filename, uschar **errmsg)
+{
+return (void *)(1); /* Just return something non-null */
+}
+
+
+
+/*************************************************
+* Tidy entry point *
+*************************************************/
+
+/* See local README for interface description. */
+
+static void
+oracle_tidy(void)
+{
+oracle_connection *cn;
+while ((cn = oracle_connections) != NULL)
+ {
+ oracle_connections = cn->next;
+ DEBUG(D_lookup) debug_printf("close ORACLE connection: %s\n", cn->server);
+ ologof(cn->handle);
+ }
+}
+
+
+
+/*************************************************
+* Internal search function *
+*************************************************/
+
+/* This function is called from the find entry point to do the search for a
+single server.
+
+Arguments:
+ query the query string
+ server the server string
+ resultptr where to store the result
+ errmsg where to point an error message
+ defer_break TRUE if no more servers are to be tried after DEFER
+
+The server string is of the form "host/dbname/user/password", for compatibility
+with MySQL and pgsql, but at present, the dbname is not used. This string is in
+a nextinlist temporary buffer, so can be overwritten.
+
+Returns: OK, FAIL, or DEFER
+*/
+
+static int
+perform_oracle_search(uschar *query, uschar *server, uschar **resultptr,
+ uschar **errmsg, BOOL *defer_break)
+{
+Cda_Def *cda = NULL;
+struct cda_def *oracle_handle = NULL;
+Ora_Describe *desc = NULL;
+Ora_Define *def = NULL;
+void *hda = NULL;
+
+int i;
+int yield = DEFER;
+unsigned int num_fields = 0;
+gstring * result = NULL;
+oracle_connection *cn = NULL;
+uschar *server_copy = NULL;
+uschar *sdata[4];
+
+/* Disaggregate the parameters from the server argument. The order is host,
+database, user, password. We can write to the string, since it is in a
+nextinlist temporary buffer. The copy of the string that is used for caching
+has the password removed. This copy is also used for debugging output. */
+
+for (i = 3; i > 0; i--)
+ {
+ uschar *pp = Ustrrchr(server, '/');
+ if (pp == NULL)
+ {
+ *errmsg = string_sprintf("incomplete ORACLE server data: %s", server);
+ *defer_break = TRUE;
+ return DEFER;
+ }
+ *pp++ = 0;
+ sdata[i] = pp;
+ if (i == 3) server_copy = string_copy(server); /* sans password */
+ }
+sdata[0] = server; /* What's left at the start */
+
+/* If the database is the empty string, set it NULL - the query must then
+define it. */
+
+if (sdata[1][0] == 0) sdata[1] = NULL;
+
+/* See if we have a cached connection to the server */
+
+for (cn = oracle_connections; cn; cn = cn->next)
+ if (strcmp(cn->server, server_copy) == 0)
+ {
+ oracle_handle = cn->handle;
+ hda = cn->hda_mem;
+ break;
+ }
+
+/* If no cached connection, we must set one up */
+
+if (!cn)
+ {
+ DEBUG(D_lookup) debug_printf("ORACLE new connection: host=%s database=%s "
+ "user=%s\n", sdata[0], sdata[1], sdata[2]);
+
+ /* Get store for a new connection, initialize it, and connect to the server */
+
+ oracle_handle = store_get(sizeof(struct cda_def));
+ hda = store_get(HDA_SIZE);
+ memset(hda,'\0',HDA_SIZE);
+
+ /*
+ * Perform a default (blocking) login
+ *
+ * sdata[0] = tnsname (service name - typically host name)
+ * sdata[1] = dbname - not used at present
+ * sdata[2] = username
+ * sdata[3] = passwd
+ */
+
+ if(olog(oracle_handle, hda, sdata[2], -1, sdata[3], -1, sdata[0], -1,
+ (ub4)OCI_LM_DEF) != 0)
+ {
+ *errmsg = oracle_error(oracle_handle, oracle_handle->rc,
+ US"connection failed");
+ *defer_break = FALSE;
+ goto ORACLE_EXIT_NO_VALS;
+ }
+
+ /* Add the connection to the cache */
+
+ cn = store_get(sizeof(oracle_connection));
+ cn->server = server_copy;
+ cn->handle = oracle_handle;
+ cn->next = oracle_connections;
+ cn->hda_mem = hda;
+ oracle_connections = cn;
+ }
+
+/* Else use a previously cached connection - we can write to the server string
+to obliterate the password because it is in a nextinlist temporary buffer. */
+
+else
+ {
+ DEBUG(D_lookup)
+ debug_printf("ORACLE using cached connection for %s\n", server_copy);
+ }
+
+/* We have a connection. Open a cursor and run the query */
+
+cda = store_get(sizeof(Cda_Def));
+
+if (oopen(cda, oracle_handle, (text *)0, -1, -1, (text *)0, -1) != 0)
+ {
+ *errmsg = oracle_error(oracle_handle, cda->rc, "failed to open cursor");
+ *defer_break = FALSE;
+ goto ORACLE_EXIT_NO_VALS;
+ }
+
+if (oparse(cda, (text *)query, (sb4) -1,
+ (sword)PARSE_NO_DEFER, (ub4)PARSE_V7_LNG) != 0)
+ {
+ *errmsg = oracle_error(oracle_handle, cda->rc, "query failed");
+ *defer_break = FALSE;
+ oclose(cda);
+ goto ORACLE_EXIT_NO_VALS;
+ }
+
+/* Find the number of fields returned and sort out their types. If the number
+is one, we don't add field names to the data. Otherwise we do. */
+
+def = store_get(sizeof(Ora_Define)*MAX_SELECT_LIST_SIZE);
+desc = store_get(sizeof(Ora_Describe)*MAX_SELECT_LIST_SIZE);
+
+if ((num_fields = describe_define(cda,def,desc)) == -1)
+ {
+ *errmsg = oracle_error(oracle_handle, cda->rc, "describe_define failed");
+ *defer_break = FALSE;
+ goto ORACLE_EXIT;
+ }
+
+if (oexec(cda)!=0)
+ {
+ *errmsg = oracle_error(oracle_handle, cda->rc, "oexec failed");
+ *defer_break = FALSE;
+ goto ORACLE_EXIT;
+ }
+
+/* Get the fields and construct the result string. If there is more than one
+row, we insert '\n' between them. */
+
+while (cda->rc != NO_DATA_FOUND) /* Loop for each row */
+ {
+ ofetch(cda);
+ if(cda->rc == NO_DATA_FOUND) break;
+
+ if (result) result = string_catn(result, "\n", 1);
+
+ /* Single field - just add on the data */
+
+ if (num_fields == 1)
+ result = string_catn(result, def[0].buf, def[0].col_retlen);
+
+ /* Multiple fields - precede by file name, removing {lead,trail}ing WS */
+
+ else for (i = 0; i < num_fields; i++)
+ {
+ int slen;
+ uschar *s = US desc[i].buf;
+
+ while (*s != 0 && isspace(*s)) s++;
+ slen = Ustrlen(s);
+ while (slen > 0 && isspace(s[slen-1])) slen--;
+ result = string_catn(result, s, slen);
+ result = string_catn(result, US"=", 1);
+
+ /* int and float type won't ever need escaping. Otherwise, quote the value
+ if it contains spaces or is empty. */
+
+ if (desc[i].dbtype != INT_TYPE && desc[i].dbtype != FLOAT_TYPE &&
+ (def[i].buf[0] == 0 || strchr(def[i].buf, ' ') != NULL))
+ {
+ int j;
+ result = string_catn(result, "\"", 1);
+ for (j = 0; j < def[i].col_retlen; j++)
+ {
+ if (def[i].buf[j] == '\"' || def[i].buf[j] == '\\')
+ result = string_catn(result, "\\", 1);
+ result = string_catn(result, def[i].buf+j, 1);
+ }
+ result = string_catn(result, "\"", 1);
+ }
+
+ else switch(desc[i].dbtype)
+ {
+ case INT_TYPE:
+ result = string_cat(result, string_sprintf("%d", def[i].int_buf));
+ break;
+
+ case FLOAT_TYPE:
+ result = string_cat(result, string_sprintf("%f", def[i].flt_buf));
+ break;
+
+ case STRING_TYPE:
+ result = string_catn(result, def[i].buf, def[i].col_retlen);
+ break;
+
+ default:
+ *errmsg = string_sprintf("ORACLE: unknown field type %d", desc[i].dbtype);
+ *defer_break = FALSE;
+ result = NULL;
+ goto ORACLE_EXIT;
+ }
+
+ result = string_catn(result, " ", 1);
+ }
+ }
+
+/* If result is NULL then no data has been found and so we return FAIL.
+Otherwise, we must terminate the string which has been built; string_cat()
+always leaves enough room for a terminating zero. */
+
+if (!result)
+ {
+ yield = FAIL;
+ *errmsg = "ORACLE: no data found";
+ }
+else
+ store_reset(result->s + result->ptr + 1);
+
+/* Get here by goto from various error checks. */
+
+ORACLE_EXIT:
+
+/* Close the cursor; don't close the connection, as it is cached. */
+
+oclose(cda);
+
+ORACLE_EXIT_NO_VALS:
+
+/* Non-NULL result indicates a successful result */
+
+if (result)
+ {
+ *resultptr = string_from_gstring(result);
+ return OK;
+ }
+else
+ {
+ DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
+ return yield; /* FAIL or DEFER */
+ }
+}
+
+
+
+
+/*************************************************
+* Find entry point *
+*************************************************/
+
+/* See local README for interface description. The handle and filename
+arguments are not used. Loop through a list of servers while the query is
+deferred with a retryable error. */
+
+static int
+oracle_find(void *handle, uschar *filename, uschar *query, int length,
+ uschar **result, uschar **errmsg, uint *do_cache)
+{
+int sep = 0;
+uschar *server;
+uschar *list = oracle_servers;
+uschar buffer[512];
+
+do_cache = do_cache; /* Placate picky compilers */
+
+DEBUG(D_lookup) debug_printf("ORACLE query: %s\n", query);
+
+while ((server = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
+ {
+ BOOL defer_break;
+ int rc = perform_oracle_search(query, server, result, errmsg, &defer_break);
+ if (rc != DEFER || defer_break) return rc;
+ }
+
+if (oracle_servers == NULL)
+ *errmsg = "no ORACLE servers defined (oracle_servers option)";
+
+return DEFER;
+}
+
+
+
+/*************************************************
+* Quote entry point *
+*************************************************/
+
+/* The only characters that need to be quoted (with backslash) are newline,
+tab, carriage return, backspace, backslash itself, and the quote characters.
+Percent and underscore are not escaped. They are only special in contexts where
+they can be wild cards, and this isn't usually the case for data inserted from
+messages, since that isn't likely to be treated as a pattern of any kind.
+
+Arguments:
+ s the string to be quoted
+ opt additional option text or NULL if none
+
+Returns: the processed string or NULL for a bad option
+*/
+
+static uschar *
+oracle_quote(uschar *s, uschar *opt)
+{
+register int c;
+int count = 0;
+uschar *t = s;
+uschar *quoted;
+
+if (opt != NULL) return NULL; /* No options are recognized */
+
+while ((c = *t++) != 0)
+ if (strchr("\n\t\r\b\'\"\\", c) != NULL) count++;
+
+if (count == 0) return s;
+t = quoted = store_get((int)strlen(s) + count + 1);
+
+while ((c = *s++) != 0)
+ {
+ if (strchr("\n\t\r\b\'\"\\", c) != NULL)
+ {
+ *t++ = '\\';
+ switch(c)
+ {
+ case '\n': *t++ = 'n';
+ break;
+ case '\t': *t++ = 't';
+ break;
+ case '\r': *t++ = 'r';
+ break;
+ case '\b': *t++ = 'b';
+ break;
+ default: *t++ = c;
+ break;
+ }
+ }
+ else *t++ = c;
+ }
+
+*t = 0;
+return quoted;
+}
+
+
+/*************************************************
+* Version reporting entry point *
+*************************************************/
+
+/* See local README for interface description. */
+
+#include "../version.h"
+
+void
+oracle_version_report(FILE *f)
+{
+#ifdef DYNLOOKUP
+fprintf(f, "Library version: Oracle: Exim version %s\n", EXIM_VERSION_STR);
+#endif
+}
+
+
+static lookup_info _lookup_info = {
+ US"oracle", /* lookup name */
+ lookup_querystyle, /* query-style lookup */
+ oracle_open, /* open function */
+ NULL, /* check function */
+ oracle_find, /* find function */
+ NULL, /* no close function */
+ oracle_tidy, /* tidy function */
+ oracle_quote, /* quoting function */
+ oracle_version_report /* version reporting */
+};
+
+#ifdef DYNLOOKUP
+#define oracle_lookup_module_info _lookup_module_info
+#endif
+
+static lookup_info *_lookup_list[] = { &_lookup_info };
+lookup_module_info oracle_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
+
+/* End of lookups/oracle.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 05:31:43 +0000