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00032 #include "asterisk.h"
00033
00034 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 370642 $")
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 }
00159
00160 ast_channel_lock(chan);
00161
00162 if (!(varstore = ast_channel_datastore_find(chan, &shared_variable_info, NULL))) {
00163 ast_channel_unlock(chan);
00164 if (c_ref) {
00165 c_ref = ast_channel_unref(c_ref);
00166 }
00167 return -1;
00168 }
00169
00170 varshead = varstore->data;
00171 *buf = '\0';
00172
00173
00174 AST_LIST_TRAVERSE(varshead, var, entries) {
00175 if (!strcmp(args.var, ast_var_name(var))) {
00176 ast_copy_string(buf, ast_var_value(var), len);
00177 break;
00178 }
00179 }
00180
00181 ast_channel_unlock(chan);
00182
00183 if (c_ref) {
00184 c_ref = ast_channel_unref(c_ref);
00185 }
00186
00187 return 0;
00188 }
00189
00190 static int shared_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)
00191 {
00192 struct ast_datastore *varstore;
00193 struct varshead *varshead;
00194 struct ast_var_t *var;
00195 AST_DECLARE_APP_ARGS(args,
00196 AST_APP_ARG(var);
00197 AST_APP_ARG(chan);
00198 );
00199 struct ast_channel *c_ref = NULL;
00200
00201 if (ast_strlen_zero(data)) {
00202 ast_log(LOG_WARNING, "SHARED() requires an argument: SHARED(<var>[,<chan>])\n");
00203 return -1;
00204 }
00205
00206 AST_STANDARD_APP_ARGS(args, data);
00207
00208 if (!ast_strlen_zero(args.chan)) {
00209 char *prefix = ast_alloca(strlen(args.chan) + 2);
00210 sprintf(prefix, "%s-", args.chan);
00211 if (!(c_ref = ast_channel_get_by_name(args.chan)) && !(c_ref = ast_channel_get_by_name_prefix(prefix, strlen(prefix)))) {
00212 ast_log(LOG_ERROR, "Channel '%s' not found! Variable '%s' not set to '%s'.\n", args.chan, args.var, value);
00213 return -1;
00214 }
00215 chan = c_ref;
00216 }
00217
00218 ast_channel_lock(chan);
00219
00220 if (!(varstore = ast_channel_datastore_find(chan, &shared_variable_info, NULL))) {
00221 if (!(varstore = ast_datastore_alloc(&shared_variable_info, NULL))) {
00222 ast_log(LOG_ERROR, "Unable to allocate new datastore. Shared variable not set.\n");
00223 ast_channel_unlock(chan);
00224 if (c_ref) {
00225 c_ref = ast_channel_unref(c_ref);
00226 }
00227 return -1;
00228 }
00229
00230 if (!(varshead = ast_calloc(1, sizeof(*varshead)))) {
00231 ast_log(LOG_ERROR, "Unable to allocate variable structure. Shared variable not set.\n");
00232 ast_datastore_free(varstore);
00233 ast_channel_unlock(chan);
00234 if (c_ref) {
00235 c_ref = ast_channel_unref(c_ref);
00236 }
00237 return -1;
00238 }
00239
00240 varstore->data = varshead;
00241 ast_channel_datastore_add(chan, varstore);
00242 }
00243 varshead = varstore->data;
00244
00245
00246 AST_LIST_TRAVERSE_SAFE_BEGIN(varshead, var, entries) {
00247
00248 if (!strcmp(args.var, ast_var_name(var))) {
00249 AST_LIST_REMOVE_CURRENT(entries);
00250 ast_var_delete(var);
00251 break;
00252 }
00253 }
00254 AST_LIST_TRAVERSE_SAFE_END;
00255
00256 var = ast_var_assign(args.var, S_OR(value, ""));
00257 AST_LIST_INSERT_HEAD(varshead, var, entries);
00258 manager_event(EVENT_FLAG_DIALPLAN, "VarSet",
00259 "Channel: %s\r\n"
00260 "Variable: SHARED(%s)\r\n"
00261 "Value: %s\r\n"
00262 "Uniqueid: %s\r\n",
00263 chan ? chan->name : "none", args.var, value,
00264 chan ? chan->uniqueid : "none");
00265
00266 ast_channel_unlock(chan);
00267
00268 if (c_ref) {
00269 c_ref = ast_channel_unref(c_ref);
00270 }
00271
00272 return 0;
00273 }
00274
00275 static struct ast_custom_function shared_function = {
00276 .name = "SHARED",
00277 .read = shared_read,
00278 .write = shared_write,
00279 };
00280
00281 static int unload_module(void)
00282 {
00283 int res = 0;
00284
00285 res |= ast_custom_function_unregister(&global_function);
00286 res |= ast_custom_function_unregister(&shared_function);
00287
00288 return res;
00289 }
00290
00291 static int load_module(void)
00292 {
00293 int res = 0;
00294
00295 res |= ast_custom_function_register(&global_function);
00296 res |= ast_custom_function_register(&shared_function);
00297
00298 return res;
00299 }
00300
00301 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Variable dialplan functions");