Add support for action scripts in hostapd_cli

hostapd/hostapd_cli.1

@@ -3,7 +3,7 @@
 hostapd_cli \- hostapd command-line interface
 .SH SYNOPSIS
 .B hostapd_cli
-[\-p<path>] [\-i<ifname>] [\-hv] [command..]
+[\-p<path>] [\-i<ifname>] [\-a<path>] [\-hvB] [command..]
 .SH DESCRIPTION
 This manual page documents briefly the
 .B hostapd_cli
@@ -38,6 +38,12 @@ Interface to listen on.
 
 Default: first interface found in socket path.
 .TP
+.B \-a<path>
+Run in daemon mode executing the action file based on events from hostapd.
+.TP
+.B \-B
+Run a daemon in the background.
+.TP
 .B \-h
 Show usage.
 .TP

hostapd/hostapd_cli.c

@@ -104,23 +104,29 @@ static int hostapd_cli_quit = 0;
 static int hostapd_cli_attached = 0;
 static const char *ctrl_iface_dir = "/var/run/hostapd";
 static char *ctrl_ifname = NULL;
+static const char *pid_file = NULL;
+static const char *action_file = NULL;
 static int ping_interval = 5;
 
 
 static void usage(void)
 {
 	fprintf(stderr, "%s\n", hostapd_cli_version);
-	fprintf(stderr, 
-		"\n"	
-		"usage: hostapd_cli [-p<path>] [-i<ifname>] [-hv] "
-		"[-G<ping interval>] \\\n"
-		"        [command..]\n"
+	fprintf(stderr,
+		"\n"
+		"usage: hostapd_cli [-p<path>] [-i<ifname>] [-hvB] "
+		"[-a<path>] \\\n"
+		"                   [-G<ping interval>] [command..]\n"
 		"\n"
 		"Options:\n"
 		"   -h           help (show this usage text)\n"
 		"   -v           shown version information\n"
 		"   -p<path>     path to find control sockets (default: "
 		"/var/run/hostapd)\n"
+		"   -a<file>     run in daemon mode executing the action file "
+		"based on events\n"
+		"                from hostapd\n"
+		"   -B           run a daemon in the background\n"
 		"   -i<ifname>   Interface to listen on (default: first "
 		"interface found in the\n"
 		"                socket path)\n\n"
@@ -215,6 +221,51 @@ static int hostapd_cli_cmd_mib(struct wpa_ctrl *ctrl, int argc, char *argv[])
 }
 
 
+static int hostapd_cli_exec(const char *program, const char *arg1,
+			    const char *arg2)
+{
+	char *cmd;
+	size_t len;
+	int res;
+	int ret = 0;
+
+	len = os_strlen(program) + os_strlen(arg1) + os_strlen(arg2) + 3;
+	cmd = os_malloc(len);
+	if (cmd == NULL)
+		return -1;
+	res = os_snprintf(cmd, len, "%s %s %s", program, arg1, arg2);
+	if (res < 0 || (size_t) res >= len) {
+		os_free(cmd);
+		return -1;
+	}
+	cmd[len - 1] = '\0';
+#ifndef _WIN32_WCE
+	if (system(cmd) < 0)
+		ret = -1;
+#endif /* _WIN32_WCE */
+	os_free(cmd);
+
+	return ret;
+}
+
+
+static void hostapd_cli_action_process(char *msg, size_t len)
+{
+	const char *pos;
+
+	pos = msg;
+	if (*pos == '<') {
+		pos = os_strchr(pos, '>');
+		if (pos)
+			pos++;
+		else
+			pos = msg;
+	}
+
+	hostapd_cli_exec(action_file, ctrl_ifname, pos);
+}
+
+
 static int hostapd_cli_cmd_sta(struct wpa_ctrl *ctrl, int argc, char *argv[])
 {
 	char buf[64];
@@ -558,7 +609,8 @@ static void wpa_request(struct wpa_ctrl *ctrl, int argc, char *argv[])
 }
 
 
-static void hostapd_cli_recv_pending(struct wpa_ctrl *ctrl, int in_read)
+static void hostapd_cli_recv_pending(struct wpa_ctrl *ctrl, int in_read,
+				     int action_monitor)
 {
 	int first = 1;
 	if (ctrl_conn == NULL)
@@ -568,10 +620,14 @@ static void hostapd_cli_recv_pending(struct wpa_ctrl *ctrl, int in_read)
 		size_t len = sizeof(buf) - 1;
 		if (wpa_ctrl_recv(ctrl, buf, &len) == 0) {
 			buf[len] = '\0';
-			if (in_read && first)
-				printf("\n");
-			first = 0;
-			printf("%s\n", buf);
+			if (action_monitor)
+				hostapd_cli_action_process(buf, len);
+			else {
+				if (in_read && first)
+					printf("\n");
+				first = 0;
+				printf("%s\n", buf);
+			}
 		} else {
 			printf("Could not read pending message.\n");
 			break;
@@ -589,7 +645,7 @@ static void hostapd_cli_interactive(void)
 	printf("\nInteractive mode\n\n");
 
 	do {
-		hostapd_cli_recv_pending(ctrl_conn, 0);
+		hostapd_cli_recv_pending(ctrl_conn, 0, 0);
 		printf("> ");
 		alarm(ping_interval);
 		res = fgets(cmd, sizeof(cmd), stdin);
@@ -626,9 +682,19 @@ static void hostapd_cli_interactive(void)
 }
 
 
-static void hostapd_cli_terminate(int sig)
+static void hostapd_cli_cleanup(void)
 {
 	hostapd_cli_close_connection();
+	if (pid_file)
+		os_daemonize_terminate(pid_file);
+
+	os_program_deinit();
+}
+
+
+static void hostapd_cli_terminate(int sig)
+{
+	hostapd_cli_cleanup();
 	exit(0);
 }
 
@@ -652,25 +718,69 @@ static void hostapd_cli_alarm(int sig)
 		}
 	}
 	if (ctrl_conn)
-		hostapd_cli_recv_pending(ctrl_conn, 1);
+		hostapd_cli_recv_pending(ctrl_conn, 1, 0);
 	alarm(ping_interval);
 }
 
 
+static void hostapd_cli_action(struct wpa_ctrl *ctrl)
+{
+	fd_set rfds;
+	int fd, res;
+	struct timeval tv;
+	char buf[256];
+	size_t len;
+
+	fd = wpa_ctrl_get_fd(ctrl);
+
+	while (!hostapd_cli_quit) {
+		FD_ZERO(&rfds);
+		FD_SET(fd, &rfds);
+		tv.tv_sec = ping_interval;
+		tv.tv_usec = 0;
+		res = select(fd + 1, &rfds, NULL, NULL, &tv);
+		if (res < 0 && errno != EINTR) {
+			perror("select");
+			break;
+		}
+
+		if (FD_ISSET(fd, &rfds))
+			hostapd_cli_recv_pending(ctrl, 0, 1);
+		else {
+			len = sizeof(buf) - 1;
+			if (wpa_ctrl_request(ctrl, "PING", 4, buf, &len,
+					     hostapd_cli_action_process) < 0 ||
+			    len < 4 || os_memcmp(buf, "PONG", 4) != 0) {
+				printf("hostapd did not reply to PING "
+				       "command - exiting\n");
+				break;
+			}
+		}
+	}
+}
+
+
 int main(int argc, char *argv[])
 {
 	int interactive;
 	int warning_displayed = 0;
 	int c;
+	int daemonize = 0;
 
 	if (os_program_init())
 		return -1;
 
 	for (;;) {
-		c = getopt(argc, argv, "hG:i:p:v");
+		c = getopt(argc, argv, "a:BhG:i:p:v");
 		if (c < 0)
 			break;
 		switch (c) {
+		case 'a':
+			action_file = optarg;
+			break;
+		case 'B':
+			daemonize = 1;
+			break;
 		case 'G':
 			ping_interval = atoi(optarg);
 			break;
@@ -693,7 +803,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	interactive = argc == optind;
+	interactive = (argc == optind) && (action_file == NULL);
 
 	if (interactive) {
 		printf("%s\n\n%s\n\n", hostapd_cli_version,
@@ -742,18 +852,27 @@ int main(int argc, char *argv[])
 	signal(SIGTERM, hostapd_cli_terminate);
 	signal(SIGALRM, hostapd_cli_alarm);
 
-	if (interactive) {
+	if (interactive || action_file) {
 		if (wpa_ctrl_attach(ctrl_conn) == 0) {
 			hostapd_cli_attached = 1;
 		} else {
 			printf("Warning: Failed to attach to hostapd.\n");
+			if (action_file)
+				return -1;
 		}
+	}
+
+	if (daemonize && os_daemonize(pid_file))
+		return -1;
+
+	if (interactive)
 		hostapd_cli_interactive();
-	} else
+	else if (action_file)
+		hostapd_cli_action(ctrl_conn);
+	else
 		wpa_request(ctrl_conn, argc - optind, &argv[optind]);
 
-	free(ctrl_ifname);
-	hostapd_cli_close_connection();
-	os_program_deinit();
+	os_free(ctrl_ifname);
+	hostapd_cli_cleanup();
 	return 0;
 }