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/*++
/* NAME
/* dict_random 3
/* SUMMARY
/* dictionary manager interface for randomized tables
/* SYNOPSIS
/* #include <dict_random.h>
/*
/* DICT *dict_random_open(name, open_flags, dict_flags)
/* const char *name;
/* int open_flags;
/* int dict_flags;
/* DESCRIPTION
/* dict_random_open() opens an in-memory, read-only, table.
/* Example: "\fBrandmap:{\fIresult_1, ... ,result_n}\fR".
/*
/* Each table query returns a random choice from the specified
/* results. Other table access methods are not supported.
/*
/* The first and last characters of the "randmap:" table name
/* must be '{' and '}'. Within these, individual maps are
/* separated with comma or whitespace.
/* SEE ALSO
/* dict(3) generic dictionary manager
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <string.h>
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <myrand.h>
#include <stringops.h>
#include <dict_random.h>
/* Application-specific. */
typedef struct {
DICT dict; /* generic members */
ARGV *replies; /* reply values */
} DICT_RANDOM;
#define STR(x) vstring_str(x)
/* dict_random_lookup - find randomized-table entry */
static const char *dict_random_lookup(DICT *dict, const char *unused_query)
{
DICT_RANDOM *dict_random = (DICT_RANDOM *) dict;
DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE,
dict_random->replies->argv[myrand() % dict_random->replies->argc]);
}
/* dict_random_close - disassociate from randomized table */
static void dict_random_close(DICT *dict)
{
DICT_RANDOM *dict_random = (DICT_RANDOM *) dict;
if (dict_random->replies)
argv_free(dict_random->replies);
dict_free(dict);
}
static char *dict_random_parse_name(DICT *dict, ARGV **argv,
const char *string,
const char *delim,
const char *parens)
{
ARGV *argvp = argv_alloc(1);
char *saved_string = mystrdup(string);
char *bp = saved_string;
char *arg;
VSTRING *b64 = 0;
char *err = 0;
while ((arg = mystrtokq(&bp, delim, parens)) != 0) {
if (dict->flags & DICT_FLAG_SRC_RHS_IS_FILE) {
if ((b64 = dict_file_to_b64(dict, arg)) != 0) {
argv_add(argvp, vstring_str(b64), (char *) 0);
} else {
err = dict_file_get_error(dict);
break;
}
} else {
argv_add(argvp, arg, (char *) 0);
}
}
argv_terminate(argvp);
myfree(saved_string);
*argv = argvp;
return (err);
}
/* dict_random_open - open a randomized table */
DICT *dict_random_open(const char *name, int open_flags, int dict_flags)
{
DICT_RANDOM *dict_random;
char *saved_name = 0;
size_t len;
char *err = 0;
/*
* Clarity first. Let the optimizer worry about redundant code.
*/
#define DICT_RANDOM_RETURN(x) do { \
DICT *__d = (x); \
if (saved_name != 0) \
myfree(saved_name); \
if (err != 0) \
myfree(err); \
return (__d); \
} while (0)
/*
* Sanity checks.
*/
if (open_flags != O_RDONLY)
DICT_RANDOM_RETURN(dict_surrogate(DICT_TYPE_RANDOM, name,
open_flags, dict_flags,
"%s:%s map requires O_RDONLY access mode",
DICT_TYPE_RANDOM, name));
/*
* Bundle up preliminary results.
*/
dict_random =
(DICT_RANDOM *) dict_alloc(DICT_TYPE_RANDOM, name, sizeof(*dict_random));
dict_random->dict.lookup = dict_random_lookup;
dict_random->dict.close = dict_random_close;
dict_random->dict.flags = dict_flags | DICT_FLAG_PATTERN;
dict_random->replies = 0;
dict_random->dict.owner.status = DICT_OWNER_TRUSTED;
dict_random->dict.owner.uid = 0;
/*
* Split the table name into its constituent parts.
*/
if ((len = balpar(name, CHARS_BRACE)) == 0 || name[len] != 0
|| *(saved_name = mystrndup(name + 1, len - 2)) == 0
|| (err = dict_random_parse_name(&dict_random->dict,
&dict_random->replies, saved_name,
CHARS_COMMA_SP, CHARS_BRACE)) != 0
|| dict_random->replies->argc == 0) {
dict_random_close(&dict_random->dict);
DICT_RANDOM_RETURN(err == 0 ?
dict_surrogate(DICT_TYPE_RANDOM, name,
open_flags, dict_flags,
"bad syntax: \"%s:%s\"; "
"need \"%s:{value...}\"",
DICT_TYPE_RANDOM, name,
DICT_TYPE_RANDOM) :
dict_surrogate(DICT_TYPE_RANDOM, name,
open_flags, dict_flags,
"%s", err));
}
dict_file_purge_buffers(&dict_random->dict);
DICT_RANDOM_RETURN(DICT_DEBUG (&dict_random->dict));
}
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