add a system object that allows us to set passwords and trigger sysupgrade

Signed-off-by: John Crispin <blogic@openwrt.org>

2 files changed, 258 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1e283d..60959d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,7 @@ INCLUDE_DIRECTORIES(include)
 
 OPTION(FILE_SUPPORT "File plugin support" ON)
 OPTION(IWINFO_SUPPORT "libiwinfo plugin support" ON)
+OPTION(RPCSYS_SUPPORT "rpc-sys plugin support" ON)
 
 SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
 
@@ -39,6 +40,13 @@ IF(FILE_SUPPORT)
   SET_TARGET_PROPERTIES(file_plugin PROPERTIES OUTPUT_NAME file PREFIX "")
 ENDIF()
 
+IF(RPCSYS_SUPPORT)
+  SET(PLUGINS ${PLUGINS} rpcsys_plugin)
+  ADD_LIBRARY(rpcsys_plugin MODULE sys.c)
+  TARGET_LINK_LIBRARIES(rpcsys_plugin ubox ubus)
+  SET_TARGET_PROPERTIES(rpcsys_plugin PROPERTIES OUTPUT_NAME rpcsys PREFIX "")
+ENDIF()
+
 IF (IWINFO_SUPPORT)
   SET(PLUGINS ${PLUGINS} iwinfo_plugin)
   ADD_LIBRARY(iwinfo_plugin MODULE iwinfo.c)
diff --git a/sys.c b/sys.c
new file mode 100644
index 0000000..b90aa6b
--- /dev/null
+++ b/sys.c
@@ -0,0 +1,250 @@
+/*
+ * rpcd - UBUS RPC server
+ *
+ *   Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <libubus.h>
+
+#include <rpcd/exec.h>
+#include <rpcd/plugin.h>
+#include <rpcd/session.h>
+#include <sys/reboot.h>
+
+static const struct rpc_daemon_ops *ops;
+
+enum {
+	RPC_P_USER,
+	RPC_P_PASSWORD,
+	__RPC_P_MAX
+};
+
+static const struct blobmsg_policy rpc_password_policy[__RPC_P_MAX] = {
+	[RPC_P_USER]     = { .name = "user",     .type = BLOBMSG_TYPE_STRING },
+	[RPC_P_PASSWORD] = { .name = "password", .type = BLOBMSG_TYPE_STRING },
+};
+
+enum {
+	RPC_UPGRADE_KEEP,
+	__RPC_UPGRADE_MAX
+};
+
+static const struct blobmsg_policy rpc_upgrade_policy[__RPC_UPGRADE_MAX] = {
+	[RPC_UPGRADE_KEEP] = { .name = "keep",    .type = BLOBMSG_TYPE_BOOL },
+};
+
+static int
+rpc_errno_status(void)
+{
+	switch (errno)
+	{
+	case EACCES:
+		return UBUS_STATUS_PERMISSION_DENIED;
+
+	case ENOTDIR:
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	case ENOENT:
+		return UBUS_STATUS_NOT_FOUND;
+
+	case EINVAL:
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	default:
+		return UBUS_STATUS_UNKNOWN_ERROR;
+	}
+}
+
+static int
+rpc_cgi_password_set(struct ubus_context *ctx, struct ubus_object *obj,
+                       struct ubus_request_data *req, const char *method,
+                       struct blob_attr *msg)
+{
+	pid_t pid;
+	int fd, fds[2];
+	struct stat s;
+	struct blob_attr *tb[__RPC_P_MAX];
+
+	blobmsg_parse(rpc_password_policy, __RPC_P_MAX, tb,
+	              blob_data(msg), blob_len(msg));
+
+	if (!tb[RPC_P_USER] || !tb[RPC_P_PASSWORD])
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	if (stat("/usr/bin/passwd", &s))
+		return UBUS_STATUS_NOT_FOUND;
+
+	if (!(s.st_mode & S_IXUSR))
+		return UBUS_STATUS_PERMISSION_DENIED;
+
+	if (pipe(fds))
+		return rpc_errno_status();
+
+	switch ((pid = fork()))
+	{
+	case -1:
+		close(fds[0]);
+		close(fds[1]);
+		return rpc_errno_status();
+
+	case 0:
+		uloop_done();
+
+		dup2(fds[0], 0);
+		close(fds[0]);
+		close(fds[1]);
+
+		if ((fd = open("/dev/null", O_RDWR)) > -1)
+		{
+			dup2(fd, 1);
+			dup2(fd, 2);
+			close(fd);
+		}
+
+		chdir("/");
+
+		if (execl("/usr/bin/passwd", "/usr/bin/passwd",
+		          blobmsg_data(tb[RPC_P_USER]), NULL))
+			return rpc_errno_status();
+
+	default:
+		close(fds[0]);
+
+		write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
+		              blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
+		write(fds[1], "\n", 1);
+
+		usleep(100 * 1000);
+
+		write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
+		              blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
+		write(fds[1], "\n", 1);
+
+		close(fds[1]);
+
+		waitpid(pid, NULL, 0);
+
+		return 0;
+	}
+}
+
+static int
+rpc_sys_upgrade_test(struct ubus_context *ctx, struct ubus_object *obj,
+                       struct ubus_request_data *req, const char *method,
+                       struct blob_attr *msg)
+{
+	const char *cmd[4] = { "sysupgrade", "--test", "/tmp/firmware.bin", NULL };
+	return ops->exec(cmd, NULL, NULL, NULL, NULL, NULL, ctx, req);
+}
+
+static int
+rpc_sys_upgrade_start(struct ubus_context *ctx, struct ubus_object *obj,
+                        struct ubus_request_data *req, const char *method,
+                        struct blob_attr *msg)
+{
+	struct blob_attr *tb[__RPC_UPGRADE_MAX];
+	char * const cmd[4] = { "/sbin/sysupgrade", "-n", "/tmp/firmware.bin", NULL };
+	char * const cmd_keep[3] = { "/sbin/sysupgrade", "/tmp/firmware.bin", NULL };
+	char * const * c = cmd;
+
+	blobmsg_parse(rpc_upgrade_policy, __RPC_UPGRADE_MAX, tb,
+	              blob_data(msg), blob_len(msg));
+
+	if (tb[RPC_UPGRADE_KEEP] && blobmsg_get_bool(tb[RPC_UPGRADE_KEEP]))
+		c = cmd_keep;
+
+	if (!fork()) {
+		/* wait for the RPC call to complete */
+		sleep(2);
+		return execv(c[0], c);
+	}
+
+	return 0;
+}
+
+static int
+rpc_sys_upgrade_clean(struct ubus_context *ctx, struct ubus_object *obj,
+                        struct ubus_request_data *req, const char *method,
+                        struct blob_attr *msg)
+{
+	if (unlink("/tmp/firmware.bin"))
+		return rpc_errno_status();
+
+	return 0;
+}
+
+static int
+rpc_sys_factory(struct ubus_context *ctx, struct ubus_object *obj,
+                 struct ubus_request_data *req, const char *method,
+                 struct blob_attr *msg)
+{
+	char * const cmd[4] = { "/sbin/jffs2reset", "-y", "-r", NULL };
+
+	if (!fork()) {
+		/* wait for the RPC call to complete */
+		sleep(2);
+		return execv(cmd[0], cmd);
+	}
+
+	return 0;
+}
+
+static int
+rpc_sys_reboot(struct ubus_context *ctx, struct ubus_object *obj,
+                 struct ubus_request_data *req, const char *method,
+                 struct blob_attr *msg)
+{
+	if (!fork()) {
+		sync();
+		sleep(2);
+		reboot(RB_AUTOBOOT);
+		while (1)
+			;
+	}
+
+	return 0;
+}
+
+static int
+rpc_sys_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
+{
+	static const struct ubus_method sys_methods[] = {
+		UBUS_METHOD("password_set", rpc_cgi_password_set, rpc_password_policy),
+		UBUS_METHOD_NOARG("upgrade_test", rpc_sys_upgrade_test),
+		UBUS_METHOD("upgrade_start",      rpc_sys_upgrade_start,
+		                                  rpc_upgrade_policy),
+		UBUS_METHOD_NOARG("upgrade_clean", rpc_sys_upgrade_clean),
+		UBUS_METHOD_NOARG("factory", rpc_sys_factory),
+		UBUS_METHOD_NOARG("reboot", rpc_sys_reboot),
+	};
+
+	static struct ubus_object_type sys_type =
+		UBUS_OBJECT_TYPE("luci-rpc-sys", sys_methods);
+
+	static struct ubus_object obj = {
+		.name = "rpc-sys",
+		.type = &sys_type,
+		.methods = sys_methods,
+		.n_methods = ARRAY_SIZE(sys_methods),
+	};
+
+	ops = o;
+
+	return ubus_add_object(ctx, &obj);
+}
+
+struct rpc_plugin rpc_plugin = {
+	.init = rpc_sys_api_init
+};