diff options
| -rw-r--r-- | asterisk.c | 4 | ||||
| -rw-r--r-- | funcs/func_rand.c | 143 | ||||
| -rw-r--r-- | include/asterisk/utils.h | 6 | ||||
| -rw-r--r-- | utils.c | 13 |
4 files changed, 165 insertions, 1 deletions
diff --git a/asterisk.c b/asterisk.c index 3563b41b2..b2ab02461 100644 --- a/asterisk.c +++ b/asterisk.c @@ -211,6 +211,8 @@ static int shuttingdown = 0; static int restartnow = 0; static pthread_t consolethread = AST_PTHREADT_NULL; +static char randompool[256]; + #if !defined(LOW_MEMORY) struct file_version { AST_LIST_ENTRY(file_version) list; @@ -2288,7 +2290,7 @@ int main(int argc, char *argv[]) Asterisk is started */ srand((unsigned int) getpid() + (unsigned int) time(NULL)); - srandom((unsigned int) getpid() + (unsigned int) time(NULL)); + initstate((unsigned int) getpid() * 65536 + (unsigned int) time(NULL), randompool, sizeof(randompool)); if (init_logger()) { printf(term_quit()); diff --git a/funcs/func_rand.c b/funcs/func_rand.c new file mode 100644 index 000000000..dbd82c941 --- /dev/null +++ b/funcs/func_rand.c @@ -0,0 +1,143 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 2006, Digium, Inc. + * Copyright (C) 2006, Claude Patry + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +/*! \file + * + * \brief Generate Random Number + * + * \author Claude Patry <cpatry@gmail.com> + * \author Tilghman Lesher ( http://asterisk.drunkcoder.com/ ) + */ + +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <sys/types.h> + +#include "asterisk.h" + +/* ASTERISK_FILE_VERSION(__FILE__, "$Revision: 7682 $") */ + +#include "asterisk/channel.h" +#include "asterisk/pbx.h" +#include "asterisk/logger.h" +#include "asterisk/utils.h" +#include "asterisk/app.h" +#ifndef BUILTIN_FUNC +#include "asterisk/module.h" +#endif + + +STANDARD_LOCAL_USER; + +LOCAL_USER_DECL; + + +static char *acf_rand_exec(struct ast_channel *chan, char *cmd, char *data, char *buffer, size_t buflen) +{ + struct localuser *u; + char *args[2] = { "", "" }, *s; + int min_int, response_int, max_int; + + LOCAL_USER_ACF_ADD(u); + + if (!(s = ast_strdupa(data))) { + ast_log(LOG_WARNING, "Out of memory\n"); + *buffer = '\0'; + LOCAL_USER_REMOVE(u); + return buffer; + } + + ast_app_separate_args(s, '|', args, sizeof(args) / sizeof(args[0])); + + if (ast_strlen_zero(args[0]) || sscanf(args[0], "%d", &min_int) != 1) { + min_int = 0; + } + + if (ast_strlen_zero(args[1]) || sscanf(args[1], "%d", &max_int) != 1) { + max_int = RAND_MAX; + } + + if (max_int < min_int) { + int tmp = max_int; + max_int = min_int; + min_int = tmp; + ast_log(LOG_DEBUG, "max<min\n"); + } + + response_int = min_int + (ast_random() % (max_int - min_int + 1)); + ast_log(LOG_DEBUG, "%d was the lucky number in range [%d,%d]\n", response_int, min_int, max_int); + snprintf(buffer, buflen, "%d", response_int); + + LOCAL_USER_REMOVE(u); + return buffer; +} + +#ifndef BUILTIN_FUNC +static +#endif +struct ast_custom_function acf_rand = { + .name = "RAND", + .synopsis = "Choose a random number in a range", + .syntax = "RAND([min][,max])", + .desc = +"Choose a random number between min and max. Min defaults to 0, if not\n" +"specified, while max defaults to RAND_MAX (2147483647 on many systems).\n" +" Example: Set(junky=${RAND(1,8)}); \n" +" Sets junky to a random number between 1 and 8, inclusive.\n", + .read = acf_rand_exec, +}; + + +#ifndef BUILTIN_FUNC + +static char *tdesc = "Generate a random number"; + +int unload_module(void) +{ + ast_custom_function_unregister(&acf_rand); + + STANDARD_HANGUP_LOCALUSERS; + + return 0; +} + +int load_module(void) +{ + return ast_custom_function_register(&acf_rand); +} + +char *description(void) +{ + return tdesc; +} + +int usecount(void) +{ + int res; + + STANDARD_USECOUNT(res); + + return res; +} + +char *key() +{ + return ASTERISK_GPL_KEY; +} + +#endif diff --git a/include/asterisk/utils.h b/include/asterisk/utils.h index 8e1c5a9dd..8fd42445b 100644 --- a/include/asterisk/utils.h +++ b/include/asterisk/utils.h @@ -235,4 +235,10 @@ char *ast_process_quotes_and_slashes(char *start, char find, char replace_with); int getloadavg(double *list, int nelem); #endif +#ifdef linux +#define ast_random random +#else +long int ast_random(void); +#endif + #endif /* _ASTERISK_UTILS_H */ @@ -881,6 +881,19 @@ int getloadavg(double *list, int nelem) #endif /* linux */ #endif /* !defined(_BSD_SOURCE) */ +/* glibc puts a lock inside random(3), so that the results are thread-safe. + * BSD libc (and others) do not. */ +#ifndef linux +long int ast_random(void) +{ + long int res; + ast_mutex_lock(&randomlock); + res = random(); + ast_mutex_unlock(&randomlock); + return res; +} +#endif + char *ast_process_quotes_and_slashes(char *start, char find, char replace_with) { char *dataPut = start; |