instance: avoid dumping invalid service instances - prevents a potential crash
[project/procd.git] / system.c
1 /*
2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public License version 2.1
7  * as published by the Free Software Foundation
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14
15 #include <sys/utsname.h>
16 #include <sys/sysinfo.h>
17 #include <sys/ioctl.h>
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <fcntl.h>
21 #include <signal.h>
22 #include <unistd.h>
23 #include <stdlib.h>
24
25 #include <libubox/uloop.h>
26
27 #include "procd.h"
28 #include "watchdog.h"
29
30 static struct blob_buf b;
31 static int notify;
32 static struct ubus_context *_ctx;
33
34 int upgrade_running = 0;
35
36 static int system_board(struct ubus_context *ctx, struct ubus_object *obj,
37                  struct ubus_request_data *req, const char *method,
38                  struct blob_attr *msg)
39 {
40         void *c;
41         char line[256];
42         char *key, *val, *next;
43         struct utsname utsname;
44         FILE *f;
45
46         blob_buf_init(&b, 0);
47
48         if (uname(&utsname) >= 0)
49         {
50                 blobmsg_add_string(&b, "kernel", utsname.release);
51                 blobmsg_add_string(&b, "hostname", utsname.nodename);
52         }
53
54         if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
55         {
56                 while(fgets(line, sizeof(line), f))
57                 {
58                         key = strtok(line, "\t:");
59                         val = strtok(NULL, "\t\n");
60
61                         if (!key || !val)
62                                 continue;
63
64                         if (!strcasecmp(key, "system type") ||
65                             !strcasecmp(key, "processor") ||
66                             !strcasecmp(key, "model name"))
67                         {
68                                 strtoul(val + 2, &key, 0);
69
70                                 if (key == (val + 2) || *key != 0)
71                                 {
72                                         blobmsg_add_string(&b, "system", val + 2);
73                                         break;
74                                 }
75                         }
76                 }
77
78                 fclose(f);
79         }
80
81         if ((f = fopen("/tmp/sysinfo/model", "r")) != NULL ||
82             (f = fopen("/proc/device-tree/model", "r")) != NULL)
83         {
84                 if (fgets(line, sizeof(line), f))
85                 {
86                         val = strtok(line, "\t\n");
87
88                         if (val)
89                                 blobmsg_add_string(&b, "model", val);
90                 }
91
92                 fclose(f);
93         }
94         else if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
95         {
96                 while(fgets(line, sizeof(line), f))
97                 {
98                         key = strtok(line, "\t:");
99                         val = strtok(NULL, "\t\n");
100
101                         if (!key || !val)
102                                 continue;
103
104                         if (!strcasecmp(key, "machine") ||
105                             !strcasecmp(key, "hardware"))
106                         {
107                                 blobmsg_add_string(&b, "model", val + 2);
108                                 break;
109                         }
110                 }
111
112                 fclose(f);
113         }
114
115         if ((f = fopen("/etc/openwrt_release", "r")) != NULL)
116         {
117                 c = blobmsg_open_table(&b, "release");
118
119                 while (fgets(line, sizeof(line), f))
120                 {
121                         char *dest;
122                         char ch;
123
124                         key = line;
125                         val = strchr(line, '=');
126                         if (!val)
127                                 continue;
128
129                         *(val++) = 0;
130
131                         if (!strcasecmp(key, "DISTRIB_ID"))
132                                 key = "distribution";
133                         else if (!strcasecmp(key, "DISTRIB_RELEASE"))
134                                 key = "version";
135                         else if (!strcasecmp(key, "DISTRIB_REVISION"))
136                                 key = "revision";
137                         else if (!strcasecmp(key, "DISTRIB_CODENAME"))
138                                 key = "codename";
139                         else if (!strcasecmp(key, "DISTRIB_TARGET"))
140                                 key = "target";
141                         else if (!strcasecmp(key, "DISTRIB_DESCRIPTION"))
142                                 key = "description";
143                         else
144                                 continue;
145
146                         dest = blobmsg_alloc_string_buffer(&b, key, strlen(val));
147                         while (val && (ch = *(val++)) != 0) {
148                                 switch (ch) {
149                                 case '\'':
150                                 case '"':
151                                         next = strchr(val, ch);
152                                         if (next)
153                                                 *next = 0;
154
155                                         strcpy(dest, val);
156
157                                         if (next)
158                                                 val = next + 1;
159
160                                         dest += strlen(dest);
161                                         break;
162                                 case '\\':
163                                         *(dest++) = *(val++);
164                                         break;
165                                 }
166                         }
167                         blobmsg_add_string_buffer(&b);
168                 }
169
170                 blobmsg_close_array(&b, c);
171
172                 fclose(f);
173         }
174
175         ubus_send_reply(ctx, req, b.head);
176
177         return UBUS_STATUS_OK;
178 }
179
180 static int system_info(struct ubus_context *ctx, struct ubus_object *obj,
181                 struct ubus_request_data *req, const char *method,
182                 struct blob_attr *msg)
183 {
184         void *c;
185         time_t now;
186         struct tm *tm;
187         struct sysinfo info;
188
189         now = time(NULL);
190
191         if (!(tm = localtime(&now)))
192                 return UBUS_STATUS_UNKNOWN_ERROR;
193
194         if (sysinfo(&info))
195                 return UBUS_STATUS_UNKNOWN_ERROR;
196
197         blob_buf_init(&b, 0);
198
199         blobmsg_add_u32(&b, "uptime",    info.uptime);
200         blobmsg_add_u32(&b, "localtime", mktime(tm));
201
202         c = blobmsg_open_array(&b, "load");
203         blobmsg_add_u32(&b, NULL, info.loads[0]);
204         blobmsg_add_u32(&b, NULL, info.loads[1]);
205         blobmsg_add_u32(&b, NULL, info.loads[2]);
206         blobmsg_close_array(&b, c);
207
208         c = blobmsg_open_table(&b, "memory");
209         blobmsg_add_u64(&b, "total",    info.mem_unit * info.totalram);
210         blobmsg_add_u64(&b, "free",     info.mem_unit * info.freeram);
211         blobmsg_add_u64(&b, "shared",   info.mem_unit * info.sharedram);
212         blobmsg_add_u64(&b, "buffered", info.mem_unit * info.bufferram);
213         blobmsg_close_table(&b, c);
214
215         c = blobmsg_open_table(&b, "swap");
216         blobmsg_add_u64(&b, "total",    info.mem_unit * info.totalswap);
217         blobmsg_add_u64(&b, "free",     info.mem_unit * info.freeswap);
218         blobmsg_close_table(&b, c);
219
220         ubus_send_reply(ctx, req, b.head);
221
222         return UBUS_STATUS_OK;
223 }
224
225 static int system_upgrade(struct ubus_context *ctx, struct ubus_object *obj,
226                         struct ubus_request_data *req, const char *method,
227                         struct blob_attr *msg)
228 {
229         upgrade_running = 1;
230         return 0;
231 }
232
233 enum {
234         WDT_FREQUENCY,
235         WDT_TIMEOUT,
236         WDT_STOP,
237         __WDT_MAX
238 };
239
240 static const struct blobmsg_policy watchdog_policy[__WDT_MAX] = {
241         [WDT_FREQUENCY] = { .name = "frequency", .type = BLOBMSG_TYPE_INT32 },
242         [WDT_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
243         [WDT_STOP] = { .name = "stop", .type = BLOBMSG_TYPE_BOOL },
244 };
245
246 static int watchdog_set(struct ubus_context *ctx, struct ubus_object *obj,
247                         struct ubus_request_data *req, const char *method,
248                         struct blob_attr *msg)
249 {
250         struct blob_attr *tb[__WDT_MAX];
251         const char *status;
252
253         if (!msg)
254                 return UBUS_STATUS_INVALID_ARGUMENT;
255
256         blobmsg_parse(watchdog_policy, __WDT_MAX, tb, blob_data(msg), blob_len(msg));
257         if (tb[WDT_FREQUENCY]) {
258                 unsigned int timeout = watchdog_timeout(0);
259                 unsigned int freq = blobmsg_get_u32(tb[WDT_FREQUENCY]);
260
261                 if (freq) {
262                         if (freq > timeout / 2)
263                                 freq = timeout / 2;
264                         watchdog_frequency(freq);
265                 }
266         }
267
268         if (tb[WDT_TIMEOUT]) {
269                 unsigned int timeout = blobmsg_get_u32(tb[WDT_TIMEOUT]);
270                 unsigned int frequency = watchdog_frequency(0);
271
272                 if (timeout <= frequency)
273                         timeout = frequency * 2;
274                  watchdog_timeout(timeout);
275         }
276
277         if (tb[WDT_STOP])
278                 watchdog_set_stopped(blobmsg_get_bool(tb[WDT_STOP]));
279
280         if (watchdog_fd() < 0)
281                 status = "offline";
282         else if (watchdog_get_stopped())
283                 status = "stopped";
284         else
285                 status = "running";
286
287         blob_buf_init(&b, 0);
288         blobmsg_add_string(&b, "status", status);
289         blobmsg_add_u32(&b, "timeout", watchdog_timeout(0));
290         blobmsg_add_u32(&b, "frequency", watchdog_frequency(0));
291         ubus_send_reply(ctx, req, b.head);
292
293         return 0;
294 }
295
296 enum {
297         SIGNAL_PID,
298         SIGNAL_NUM,
299         __SIGNAL_MAX
300 };
301
302 static const struct blobmsg_policy signal_policy[__SIGNAL_MAX] = {
303         [SIGNAL_PID] = { .name = "pid", .type = BLOBMSG_TYPE_INT32 },
304         [SIGNAL_NUM] = { .name = "signum", .type = BLOBMSG_TYPE_INT32 },
305 };
306
307 static int proc_signal(struct ubus_context *ctx, struct ubus_object *obj,
308                         struct ubus_request_data *req, const char *method,
309                         struct blob_attr *msg)
310 {
311         struct blob_attr *tb[__SIGNAL_MAX];
312
313         if (!msg)
314                 return UBUS_STATUS_INVALID_ARGUMENT;
315
316         blobmsg_parse(signal_policy, __SIGNAL_MAX, tb, blob_data(msg), blob_len(msg));
317         if (!tb[SIGNAL_PID || !tb[SIGNAL_NUM]])
318                 return UBUS_STATUS_INVALID_ARGUMENT;
319
320         kill(blobmsg_get_u32(tb[SIGNAL_PID]), blobmsg_get_u32(tb[SIGNAL_NUM]));
321
322         return 0;
323 }
324
325 enum {
326         NAND_PATH,
327         __NAND_MAX
328 };
329
330 static const struct blobmsg_policy nand_policy[__NAND_MAX] = {
331         [NAND_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
332 };
333
334 static void
335 procd_spawn_upgraded(char *path)
336 {
337         char *wdt_fd = watchdog_fd();
338         char *argv[] = { "/tmp/upgraded", NULL, NULL};
339
340         argv[1] = path;
341
342         DEBUG(2, "Exec to upgraded now\n");
343         if (wdt_fd) {
344                 watchdog_no_cloexec();
345                 setenv("WDTFD", wdt_fd, 1);
346         }
347         execvp(argv[0], argv);
348 }
349
350 static int nand_set(struct ubus_context *ctx, struct ubus_object *obj,
351                         struct ubus_request_data *req, const char *method,
352                         struct blob_attr *msg)
353 {
354         struct blob_attr *tb[__NAND_MAX];
355
356         if (!msg)
357                 return UBUS_STATUS_INVALID_ARGUMENT;
358
359         blobmsg_parse(nand_policy, __NAND_MAX, tb, blob_data(msg), blob_len(msg));
360         if (!tb[NAND_PATH])
361                 return UBUS_STATUS_INVALID_ARGUMENT;
362
363         procd_spawn_upgraded(blobmsg_get_string(tb[NAND_PATH]));
364         fprintf(stderr, "Yikees, something went wrong. no /sbin/upgraded ?\n");
365         return 0;
366 }
367
368 static void
369 procd_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
370 {
371         notify = obj->has_subscribers;
372 }
373
374
375 static const struct ubus_method system_methods[] = {
376         UBUS_METHOD_NOARG("board", system_board),
377         UBUS_METHOD_NOARG("info",  system_info),
378         UBUS_METHOD_NOARG("upgrade", system_upgrade),
379         UBUS_METHOD("watchdog", watchdog_set, watchdog_policy),
380         UBUS_METHOD("signal", proc_signal, signal_policy),
381
382         /* must remain at the end as it ia not always loaded */
383         UBUS_METHOD("nandupgrade", nand_set, nand_policy),
384 };
385
386 static struct ubus_object_type system_object_type =
387         UBUS_OBJECT_TYPE("system", system_methods);
388
389 static struct ubus_object system_object = {
390         .name = "system",
391         .type = &system_object_type,
392         .methods = system_methods,
393         .n_methods = ARRAY_SIZE(system_methods),
394         .subscribe_cb = procd_subscribe_cb,
395 };
396
397 void
398 procd_bcast_event(char *event, struct blob_attr *msg)
399 {
400         int ret;
401
402         if (!notify)
403                 return;
404
405         ret = ubus_notify(_ctx, &system_object, event, msg, -1);
406         if (ret)
407                 fprintf(stderr, "Failed to notify log: %s\n", ubus_strerror(ret));
408 }
409
410 void ubus_init_system(struct ubus_context *ctx)
411 {
412         struct stat s;
413         int ret;
414
415         if (stat("/sbin/upgraded", &s))
416                 system_object.n_methods -= 1;
417
418         _ctx = ctx;
419         ret = ubus_add_object(ctx, &system_object);
420         if (ret)
421                 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
422 }