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00032 #include "asterisk.h"
00033
00034 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 411313 $")
00035
00036 #include <sys/stat.h>
00037
00038 #include "asterisk/module.h"
00039 #include "asterisk/pbx.h"
00040 #include "asterisk/channel.h"
00041 #include "asterisk/app.h"
00042 #include "asterisk/manager.h"
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00089 static void shared_variable_free(void *data);
00090
00091 static const struct ast_datastore_info shared_variable_info = {
00092 .type = "SHARED_VARIABLES",
00093 .destroy = shared_variable_free,
00094 };
00095
00096 static void shared_variable_free(void *data)
00097 {
00098 struct varshead *varshead = data;
00099 struct ast_var_t *var;
00100
00101 while ((var = AST_LIST_REMOVE_HEAD(varshead, entries))) {
00102 ast_var_delete(var);
00103 }
00104 ast_free(varshead);
00105 }
00106
00107 static int global_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
00108 {
00109 const char *var = pbx_builtin_getvar_helper(NULL, data);
00110
00111 *buf = '\0';
00112
00113 if (var)
00114 ast_copy_string(buf, var, len);
00115
00116 return 0;
00117 }
00118
00119 static int global_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)
00120 {
00121 pbx_builtin_setvar_helper(NULL, data, value);
00122
00123 return 0;
00124 }
00125
00126 static struct ast_custom_function global_function = {
00127 .name = "GLOBAL",
00128 .read = global_read,
00129 .write = global_write,
00130 };
00131
00132 static int shared_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
00133 {
00134 struct ast_datastore *varstore;
00135 struct varshead *varshead;
00136 struct ast_var_t *var;
00137 AST_DECLARE_APP_ARGS(args,
00138 AST_APP_ARG(var);
00139 AST_APP_ARG(chan);
00140 );
00141 struct ast_channel *c_ref = NULL;
00142
00143 if (ast_strlen_zero(data)) {
00144 ast_log(LOG_WARNING, "SHARED() requires an argument: SHARED(<var>[,<chan>])\n");
00145 return -1;
00146 }
00147
00148 AST_STANDARD_APP_ARGS(args, data);
00149
00150 if (!ast_strlen_zero(args.chan)) {
00151 char *prefix = ast_alloca(strlen(args.chan) + 2);
00152 sprintf(prefix, "%s-", args.chan);
00153 if (!(c_ref = ast_channel_get_by_name(args.chan)) && !(c_ref = ast_channel_get_by_name_prefix(prefix, strlen(prefix)))) {
00154 ast_log(LOG_ERROR, "Channel '%s' not found! Variable '%s' will be blank.\n", args.chan, args.var);
00155 return -1;
00156 }
00157 chan = c_ref;
00158 } else if (!chan) {
00159 ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
00160 return -1;
00161 }
00162
00163 ast_channel_lock(chan);
00164
00165 if (!(varstore = ast_channel_datastore_find(chan, &shared_variable_info, NULL))) {
00166 ast_channel_unlock(chan);
00167 if (c_ref) {
00168 c_ref = ast_channel_unref(c_ref);
00169 }
00170 return -1;
00171 }
00172
00173 varshead = varstore->data;
00174 *buf = '\0';
00175
00176
00177 AST_LIST_TRAVERSE(varshead, var, entries) {
00178 if (!strcmp(args.var, ast_var_name(var))) {
00179 ast_copy_string(buf, ast_var_value(var), len);
00180 break;
00181 }
00182 }
00183
00184 ast_channel_unlock(chan);
00185
00186 if (c_ref) {
00187 c_ref = ast_channel_unref(c_ref);
00188 }
00189
00190 return 0;
00191 }
00192
00193 static int shared_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)
00194 {
00195 struct ast_datastore *varstore;
00196 struct varshead *varshead;
00197 struct ast_var_t *var;
00198 AST_DECLARE_APP_ARGS(args,
00199 AST_APP_ARG(var);
00200 AST_APP_ARG(chan);
00201 );
00202 struct ast_channel *c_ref = NULL;
00203
00204 if (ast_strlen_zero(data)) {
00205 ast_log(LOG_WARNING, "SHARED() requires an argument: SHARED(<var>[,<chan>])\n");
00206 return -1;
00207 }
00208
00209 AST_STANDARD_APP_ARGS(args, data);
00210
00211 if (!ast_strlen_zero(args.chan)) {
00212 char *prefix = ast_alloca(strlen(args.chan) + 2);
00213 sprintf(prefix, "%s-", args.chan);
00214 if (!(c_ref = ast_channel_get_by_name(args.chan)) && !(c_ref = ast_channel_get_by_name_prefix(prefix, strlen(prefix)))) {
00215 ast_log(LOG_ERROR, "Channel '%s' not found! Variable '%s' not set to '%s'.\n", args.chan, args.var, value);
00216 return -1;
00217 }
00218 chan = c_ref;
00219 } else if (!chan) {
00220 ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
00221 return -1;
00222 }
00223
00224 ast_channel_lock(chan);
00225
00226 if (!(varstore = ast_channel_datastore_find(chan, &shared_variable_info, NULL))) {
00227 if (!(varstore = ast_datastore_alloc(&shared_variable_info, NULL))) {
00228 ast_log(LOG_ERROR, "Unable to allocate new datastore. Shared variable not set.\n");
00229 ast_channel_unlock(chan);
00230 if (c_ref) {
00231 c_ref = ast_channel_unref(c_ref);
00232 }
00233 return -1;
00234 }
00235
00236 if (!(varshead = ast_calloc(1, sizeof(*varshead)))) {
00237 ast_log(LOG_ERROR, "Unable to allocate variable structure. Shared variable not set.\n");
00238 ast_datastore_free(varstore);
00239 ast_channel_unlock(chan);
00240 if (c_ref) {
00241 c_ref = ast_channel_unref(c_ref);
00242 }
00243 return -1;
00244 }
00245
00246 varstore->data = varshead;
00247 ast_channel_datastore_add(chan, varstore);
00248 }
00249 varshead = varstore->data;
00250
00251
00252 AST_LIST_TRAVERSE_SAFE_BEGIN(varshead, var, entries) {
00253
00254 if (!strcmp(args.var, ast_var_name(var))) {
00255 AST_LIST_REMOVE_CURRENT(entries);
00256 ast_var_delete(var);
00257 break;
00258 }
00259 }
00260 AST_LIST_TRAVERSE_SAFE_END;
00261
00262 if ((var = ast_var_assign(args.var, S_OR(value, "")))) {
00263 AST_LIST_INSERT_HEAD(varshead, var, entries);
00264 manager_event(EVENT_FLAG_DIALPLAN, "VarSet",
00265 "Channel: %s\r\n"
00266 "Variable: SHARED(%s)\r\n"
00267 "Value: %s\r\n"
00268 "Uniqueid: %s\r\n",
00269 chan ? chan->name : "none", args.var, value,
00270 chan ? chan->uniqueid : "none");
00271 }
00272
00273 ast_channel_unlock(chan);
00274
00275 if (c_ref) {
00276 c_ref = ast_channel_unref(c_ref);
00277 }
00278
00279 return 0;
00280 }
00281
00282 static struct ast_custom_function shared_function = {
00283 .name = "SHARED",
00284 .read = shared_read,
00285 .write = shared_write,
00286 };
00287
00288 static int unload_module(void)
00289 {
00290 int res = 0;
00291
00292 res |= ast_custom_function_unregister(&global_function);
00293 res |= ast_custom_function_unregister(&shared_function);
00294
00295 return res;
00296 }
00297
00298 static int load_module(void)
00299 {
00300 int res = 0;
00301
00302 res |= ast_custom_function_register(&global_function);
00303 res |= ast_custom_function_register(&shared_function);
00304
00305 return res;
00306 }
00307
00308 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Variable dialplan functions");