Add control interface commands for fetching wpa_config values

The new "DUMP" and "SET <variable>" control interface commands can be
used to fetch global wpa_supplicant configuration parameters.

Signed-off-by: Ola Olsson <ola.olsson@sonymobile.com>

wpa_supplicant/config.c

@@ -3556,6 +3556,8 @@ struct global_parse_data {
 	char *name;
 	int (*parser)(const struct global_parse_data *data,
 		      struct wpa_config *config, int line, const char *value);
+	int (*get)(const char *name, struct wpa_config *config, long offset,
+		   char *buf, size_t buflen, int pretty_print);
 	void *param1, *param2, *param3;
 	unsigned int changed_flag;
 };
@@ -4015,22 +4017,55 @@ static int wpa_config_process_no_ctrl_interface(
 #endif /* CONFIG_CTRL_IFACE */
 
 
+static int wpa_config_get_int(const char *name, struct wpa_config *config,
+			      long offset, char *buf, size_t buflen,
+			      int pretty_print)
+{
+	int *val = (int *) (((u8 *) config) + (long) offset);
+
+	if (pretty_print)
+		return os_snprintf(buf, buflen, "%s=%d\n", name, *val);
+	return os_snprintf(buf, buflen, "%d", *val);
+}
+
+
+static int wpa_config_get_str(const char *name, struct wpa_config *config,
+			      long offset, char *buf, size_t buflen,
+			      int pretty_print)
+{
+	char **val = (char **) (((u8 *) config) + (long) offset);
+	int res;
+
+	if (pretty_print)
+		res = os_snprintf(buf, buflen, "%s=%s\n", name,
+				  *val ? *val : "null");
+	else if (!*val)
+		return -1;
+	else
+		res = os_snprintf(buf, buflen, "%s", *val);
+	if (os_snprintf_error(buflen, res))
+		res = -1;
+
+	return res;
+}
+
+
 #ifdef OFFSET
 #undef OFFSET
 #endif /* OFFSET */
 /* OFFSET: Get offset of a variable within the wpa_config structure */
 #define OFFSET(v) ((void *) &((struct wpa_config *) 0)->v)
 
-#define FUNC(f) #f, wpa_config_process_ ## f, OFFSET(f), NULL, NULL
-#define FUNC_NO_VAR(f) #f, wpa_config_process_ ## f, NULL, NULL, NULL
-#define _INT(f) #f, wpa_global_config_parse_int, OFFSET(f)
+#define FUNC(f) #f, wpa_config_process_ ## f, NULL, OFFSET(f), NULL, NULL
+#define FUNC_NO_VAR(f) #f, wpa_config_process_ ## f, NULL, NULL, NULL, NULL
+#define _INT(f) #f, wpa_global_config_parse_int, wpa_config_get_int, OFFSET(f)
 #define INT(f) _INT(f), NULL, NULL
 #define INT_RANGE(f, min, max) _INT(f), (void *) min, (void *) max
-#define _STR(f) #f, wpa_global_config_parse_str, OFFSET(f)
+#define _STR(f) #f, wpa_global_config_parse_str, wpa_config_get_str, OFFSET(f)
 #define STR(f) _STR(f), NULL, NULL
 #define STR_RANGE(f, min, max) _STR(f), (void *) min, (void *) max
-#define BIN(f) #f, wpa_global_config_parse_bin, OFFSET(f), NULL, NULL
-#define IPV4(f) #f, wpa_global_config_parse_ipv4, OFFSET(f), NULL, NULL
+#define BIN(f) #f, wpa_global_config_parse_bin, NULL, OFFSET(f), NULL, NULL
+#define IPV4(f) #f, wpa_global_config_parse_ipv4, NULL, OFFSET(f), NULL, NULL
 
 static const struct global_parse_data global_fields[] = {
 #ifdef CONFIG_CTRL_IFACE
@@ -4164,6 +4199,50 @@ static const struct global_parse_data global_fields[] = {
 #define NUM_GLOBAL_FIELDS ARRAY_SIZE(global_fields)
 
 
+int wpa_config_dump_values(struct wpa_config *config, char *buf, size_t buflen)
+{
+	int result = 0;
+	size_t i;
+
+	for (i = 0; i < NUM_GLOBAL_FIELDS; i++) {
+		const struct global_parse_data *field = &global_fields[i];
+		int tmp;
+
+		if (!field->get)
+			continue;
+
+		tmp = field->get(field->name, config, (long) field->param1,
+				 buf, buflen, 1);
+		if (tmp < 0)
+			return -1;
+		buf += tmp;
+		buflen -= tmp;
+		result += tmp;
+	}
+	return result;
+}
+
+
+int wpa_config_get_value(const char *name, struct wpa_config *config,
+			 char *buf, size_t buflen)
+{
+	size_t i;
+
+	for (i = 0; i < NUM_GLOBAL_FIELDS; i++) {
+		const struct global_parse_data *field = &global_fields[i];
+
+		if (os_strcmp(name, field->name) != 0)
+			continue;
+		if (!field->get)
+			break;
+		return field->get(name, config, (long) field->param1,
+				  buf, buflen, 0);
+	}
+
+	return -1;
+}
+
+
 int wpa_config_process_global(struct wpa_config *config, char *pos, int line)
 {
 	size_t i;

wpa_supplicant/config.h

@@ -1167,6 +1167,11 @@ int wpa_config_set(struct wpa_ssid *ssid, const char *var, const char *value,
 		   int line);
 int wpa_config_set_quoted(struct wpa_ssid *ssid, const char *var,
 			  const char *value);
+int wpa_config_dump_values(struct wpa_config *config, char *buf,
+			   size_t buflen);
+int wpa_config_get_value(const char *name, struct wpa_config *config,
+			 char *buf, size_t buflen);
+
 char ** wpa_config_get_all(struct wpa_ssid *ssid, int get_keys);
 char * wpa_config_get(struct wpa_ssid *ssid, const char *var);
 char * wpa_config_get_no_key(struct wpa_ssid *ssid, const char *var);

wpa_supplicant/ctrl_iface.c

@@ -498,6 +498,8 @@ static int wpa_supplicant_ctrl_iface_get(struct wpa_supplicant *wpa_s,
 #endif /* CONFIG_TESTING_GET_GTK */
 	} else if (os_strcmp(cmd, "tls_library") == 0) {
 		res = tls_get_library_version(buf, buflen);
+	} else {
+		res = wpa_config_get_value(cmd, wpa_s->conf, buf, buflen);
 	}
 
 	if (os_snprintf_error(buflen, res))
@@ -7838,6 +7840,9 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 	} else if (os_strncmp(buf, "SET ", 4) == 0) {
 		if (wpa_supplicant_ctrl_iface_set(wpa_s, buf + 4))
 			reply_len = -1;
+	} else if (os_strncmp(buf, "DUMP", 4) == 0) {
+		reply_len = wpa_config_dump_values(wpa_s->conf,
+						   reply, reply_size);
 	} else if (os_strncmp(buf, "GET ", 4) == 0) {
 		reply_len = wpa_supplicant_ctrl_iface_get(wpa_s, buf + 4,
 							  reply, reply_size);

wpa_supplicant/wpa_cli.c

@@ -658,6 +658,11 @@ static char ** wpa_cli_complete_set(const char *str, int pos)
 	return NULL;
 }
 
+static int wpa_cli_cmd_dump(struct wpa_ctrl *ctrl, int argc, char *argv[])
+{
+	return wpa_ctrl_command(ctrl, "DUMP");
+}
+
 
 static int wpa_cli_cmd_get(struct wpa_ctrl *ctrl, int argc, char *argv[])
 {
@@ -2616,6 +2621,9 @@ static struct wpa_cli_cmd wpa_cli_commands[] = {
 	  cli_cmd_flag_none,
 	  "= set variables (shows list of variables when run without "
 	  "arguments)" },
+	{ "dump", wpa_cli_cmd_dump, NULL,
+	  cli_cmd_flag_none,
+	  "= dump config variables" },
 	{ "get", wpa_cli_cmd_get, NULL,
 	  cli_cmd_flag_none,
 	  "<name> = get information" },