cmake: Find libubox/blobmsg_json.h
[project/rpcd.git] / sys.c
1 /*
2  * rpcd - UBUS RPC server
3  *
4  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
5  *
6  * Permission to use, copy, modify, and/or distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18
19 #include <libubus.h>
20
21 #include <rpcd/exec.h>
22 #include <rpcd/plugin.h>
23 #include <rpcd/session.h>
24 #include <sys/reboot.h>
25
26 static const struct rpc_daemon_ops *ops;
27
28 enum {
29         RPC_P_USER,
30         RPC_P_PASSWORD,
31         __RPC_P_MAX
32 };
33
34 static const struct blobmsg_policy rpc_password_policy[__RPC_P_MAX] = {
35         [RPC_P_USER]     = { .name = "user",     .type = BLOBMSG_TYPE_STRING },
36         [RPC_P_PASSWORD] = { .name = "password", .type = BLOBMSG_TYPE_STRING },
37 };
38
39 enum {
40         RPC_UPGRADE_KEEP,
41         __RPC_UPGRADE_MAX
42 };
43
44 static const struct blobmsg_policy rpc_upgrade_policy[__RPC_UPGRADE_MAX] = {
45         [RPC_UPGRADE_KEEP] = { .name = "keep",    .type = BLOBMSG_TYPE_BOOL },
46 };
47
48 static int
49 rpc_errno_status(void)
50 {
51         switch (errno)
52         {
53         case EACCES:
54                 return UBUS_STATUS_PERMISSION_DENIED;
55
56         case ENOTDIR:
57                 return UBUS_STATUS_INVALID_ARGUMENT;
58
59         case ENOENT:
60                 return UBUS_STATUS_NOT_FOUND;
61
62         case EINVAL:
63                 return UBUS_STATUS_INVALID_ARGUMENT;
64
65         default:
66                 return UBUS_STATUS_UNKNOWN_ERROR;
67         }
68 }
69
70 static int
71 rpc_cgi_password_set(struct ubus_context *ctx, struct ubus_object *obj,
72                        struct ubus_request_data *req, const char *method,
73                        struct blob_attr *msg)
74 {
75         pid_t pid;
76         int fd, fds[2];
77         struct stat s;
78         struct blob_attr *tb[__RPC_P_MAX];
79         ssize_t n;
80         int ret;
81
82         blobmsg_parse(rpc_password_policy, __RPC_P_MAX, tb,
83                       blob_data(msg), blob_len(msg));
84
85         if (!tb[RPC_P_USER] || !tb[RPC_P_PASSWORD])
86                 return UBUS_STATUS_INVALID_ARGUMENT;
87
88         if (stat("/usr/bin/passwd", &s))
89                 return UBUS_STATUS_NOT_FOUND;
90
91         if (!(s.st_mode & S_IXUSR))
92                 return UBUS_STATUS_PERMISSION_DENIED;
93
94         if (pipe(fds))
95                 return rpc_errno_status();
96
97         switch ((pid = fork()))
98         {
99         case -1:
100                 close(fds[0]);
101                 close(fds[1]);
102                 return rpc_errno_status();
103
104         case 0:
105                 uloop_done();
106
107                 dup2(fds[0], 0);
108                 close(fds[0]);
109                 close(fds[1]);
110
111                 if ((fd = open("/dev/null", O_RDWR)) > -1)
112                 {
113                         dup2(fd, 1);
114                         dup2(fd, 2);
115                         close(fd);
116                 }
117
118                 ret = chdir("/");
119                 if (ret < 0)
120                         return rpc_errno_status();
121
122                 if (execl("/usr/bin/passwd", "/usr/bin/passwd",
123                           blobmsg_data(tb[RPC_P_USER]), NULL))
124                         return rpc_errno_status();
125
126         default:
127                 close(fds[0]);
128
129                 n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
130                               blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
131                 if (n < 0)
132                         return rpc_errno_status();
133
134                 n = write(fds[1], "\n", 1);
135                 if (n < 0)
136                         return rpc_errno_status();
137
138                 usleep(100 * 1000);
139
140                 n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
141                               blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
142                 if (n < 0)
143                         return rpc_errno_status();
144                 n = write(fds[1], "\n", 1);
145                 if (n < 0)
146                         return rpc_errno_status();
147
148                 close(fds[1]);
149
150                 waitpid(pid, NULL, 0);
151
152                 return 0;
153         }
154 }
155
156 static int
157 rpc_sys_upgrade_test(struct ubus_context *ctx, struct ubus_object *obj,
158                        struct ubus_request_data *req, const char *method,
159                        struct blob_attr *msg)
160 {
161         const char *cmd[4] = { "sysupgrade", "--test", "/tmp/firmware.bin", NULL };
162         return ops->exec(cmd, NULL, NULL, NULL, NULL, NULL, ctx, req);
163 }
164
165 static int
166 rpc_sys_upgrade_start(struct ubus_context *ctx, struct ubus_object *obj,
167                         struct ubus_request_data *req, const char *method,
168                         struct blob_attr *msg)
169 {
170         struct blob_attr *tb[__RPC_UPGRADE_MAX];
171         char * const cmd[4] = { "/sbin/sysupgrade", "-n", "/tmp/firmware.bin", NULL };
172         char * const cmd_keep[3] = { "/sbin/sysupgrade", "/tmp/firmware.bin", NULL };
173         char * const * c = cmd;
174
175         blobmsg_parse(rpc_upgrade_policy, __RPC_UPGRADE_MAX, tb,
176                       blob_data(msg), blob_len(msg));
177
178         if (tb[RPC_UPGRADE_KEEP] && blobmsg_get_bool(tb[RPC_UPGRADE_KEEP]))
179                 c = cmd_keep;
180
181         if (!fork()) {
182                 /* wait for the RPC call to complete */
183                 sleep(2);
184                 return execv(c[0], c);
185         }
186
187         return 0;
188 }
189
190 static int
191 rpc_sys_upgrade_clean(struct ubus_context *ctx, struct ubus_object *obj,
192                         struct ubus_request_data *req, const char *method,
193                         struct blob_attr *msg)
194 {
195         if (unlink("/tmp/firmware.bin"))
196                 return rpc_errno_status();
197
198         return 0;
199 }
200
201 static int
202 rpc_sys_factory(struct ubus_context *ctx, struct ubus_object *obj,
203                  struct ubus_request_data *req, const char *method,
204                  struct blob_attr *msg)
205 {
206         char * const cmd[4] = { "/sbin/jffs2reset", "-y", "-r", NULL };
207
208         if (!fork()) {
209                 /* wait for the RPC call to complete */
210                 sleep(2);
211                 return execv(cmd[0], cmd);
212         }
213
214         return 0;
215 }
216
217 static int
218 rpc_sys_reboot(struct ubus_context *ctx, struct ubus_object *obj,
219                  struct ubus_request_data *req, const char *method,
220                  struct blob_attr *msg)
221 {
222         if (!fork()) {
223                 sync();
224                 sleep(2);
225                 reboot(RB_AUTOBOOT);
226                 while (1)
227                         ;
228         }
229
230         return 0;
231 }
232
233 static int
234 rpc_sys_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
235 {
236         static const struct ubus_method sys_methods[] = {
237                 UBUS_METHOD("password_set", rpc_cgi_password_set, rpc_password_policy),
238                 UBUS_METHOD_NOARG("upgrade_test", rpc_sys_upgrade_test),
239                 UBUS_METHOD("upgrade_start",      rpc_sys_upgrade_start,
240                                                   rpc_upgrade_policy),
241                 UBUS_METHOD_NOARG("upgrade_clean", rpc_sys_upgrade_clean),
242                 UBUS_METHOD_NOARG("factory", rpc_sys_factory),
243                 UBUS_METHOD_NOARG("reboot", rpc_sys_reboot),
244         };
245
246         static struct ubus_object_type sys_type =
247                 UBUS_OBJECT_TYPE("luci-rpc-sys", sys_methods);
248
249         static struct ubus_object obj = {
250                 .name = "rpc-sys",
251                 .type = &sys_type,
252                 .methods = sys_methods,
253                 .n_methods = ARRAY_SIZE(sys_methods),
254         };
255
256         ops = o;
257
258         return ubus_add_object(ctx, &obj);
259 }
260
261 struct rpc_plugin rpc_plugin = {
262         .init = rpc_sys_api_init
263 };