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1 | /* | |
2 | * nstat.c handy utility to read counters /proc/net/netstat and snmp | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | */ | |
11 | ||
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <unistd.h> | |
15 | #include <fcntl.h> | |
16 | #include <string.h> | |
17 | #include <errno.h> | |
18 | #include <time.h> | |
19 | #include <sys/time.h> | |
20 | #include <fnmatch.h> | |
21 | #include <sys/file.h> | |
22 | #include <sys/socket.h> | |
23 | #include <sys/un.h> | |
24 | #include <sys/poll.h> | |
25 | #include <sys/wait.h> | |
26 | #include <sys/stat.h> | |
27 | #include <signal.h> | |
28 | #include <math.h> | |
29 | #include <getopt.h> | |
30 | ||
31 | #include <json_writer.h> | |
32 | #include <SNAPSHOT.h> | |
33 | #include "utils.h" | |
34 | ||
35 | int dump_zeros; | |
36 | int reset_history; | |
37 | int ignore_history; | |
38 | int no_output; | |
39 | int json_output; | |
40 | int no_update; | |
41 | int scan_interval; | |
42 | int time_constant; | |
43 | double W; | |
44 | char **patterns; | |
45 | int npatterns; | |
46 | ||
47 | char info_source[128]; | |
48 | int source_mismatch; | |
49 | ||
50 | static int generic_proc_open(const char *env, char *name) | |
51 | { | |
52 | char store[128]; | |
53 | char *p = getenv(env); | |
54 | ||
55 | if (!p) { | |
56 | p = getenv("PROC_ROOT") ? : "/proc"; | |
57 | snprintf(store, sizeof(store)-1, "%s/%s", p, name); | |
58 | p = store; | |
59 | } | |
60 | return open(p, O_RDONLY); | |
61 | } | |
62 | ||
63 | static int net_netstat_open(void) | |
64 | { | |
65 | return generic_proc_open("PROC_NET_NETSTAT", "net/netstat"); | |
66 | } | |
67 | ||
68 | static int net_snmp_open(void) | |
69 | { | |
70 | return generic_proc_open("PROC_NET_SNMP", "net/snmp"); | |
71 | } | |
72 | ||
73 | static int net_snmp6_open(void) | |
74 | { | |
75 | return generic_proc_open("PROC_NET_SNMP6", "net/snmp6"); | |
76 | } | |
77 | ||
78 | static int net_sctp_snmp_open(void) | |
79 | { | |
80 | return generic_proc_open("PROC_NET_SCTP_SNMP", "net/sctp/snmp"); | |
81 | } | |
82 | ||
83 | struct nstat_ent { | |
84 | struct nstat_ent *next; | |
85 | char *id; | |
86 | unsigned long long val; | |
87 | double rate; | |
88 | }; | |
89 | ||
90 | struct nstat_ent *kern_db; | |
91 | struct nstat_ent *hist_db; | |
92 | ||
93 | static const char *useless_numbers[] = { | |
94 | "IpForwarding", "IpDefaultTTL", | |
95 | "TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax", | |
96 | "TcpMaxConn", "TcpCurrEstab" | |
97 | }; | |
98 | ||
99 | static int useless_number(const char *id) | |
100 | { | |
101 | int i; | |
102 | ||
103 | for (i = 0; i < ARRAY_SIZE(useless_numbers); i++) | |
104 | if (strcmp(id, useless_numbers[i]) == 0) | |
105 | return 1; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static int match(const char *id) | |
110 | { | |
111 | int i; | |
112 | ||
113 | if (npatterns == 0) | |
114 | return 1; | |
115 | ||
116 | for (i = 0; i < npatterns; i++) { | |
117 | if (!fnmatch(patterns[i], id, 0)) | |
118 | return 1; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static void load_good_table(FILE *fp) | |
124 | { | |
125 | char buf[4096]; | |
126 | struct nstat_ent *db = NULL; | |
127 | struct nstat_ent *n; | |
128 | ||
129 | while (fgets(buf, sizeof(buf), fp) != NULL) { | |
130 | int nr; | |
131 | unsigned long long val; | |
132 | double rate; | |
133 | char idbuf[sizeof(buf)]; | |
134 | ||
135 | if (buf[0] == '#') { | |
136 | buf[strlen(buf)-1] = 0; | |
137 | if (info_source[0] && strcmp(info_source, buf+1)) | |
138 | source_mismatch = 1; | |
139 | info_source[0] = 0; | |
140 | strncat(info_source, buf+1, sizeof(info_source)-1); | |
141 | continue; | |
142 | } | |
143 | /* idbuf is as big as buf, so this is safe */ | |
144 | nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate); | |
145 | if (nr < 2) | |
146 | abort(); | |
147 | if (nr < 3) | |
148 | rate = 0; | |
149 | if (useless_number(idbuf)) | |
150 | continue; | |
151 | if ((n = malloc(sizeof(*n))) == NULL) | |
152 | abort(); | |
153 | n->id = strdup(idbuf); | |
154 | n->val = val; | |
155 | n->rate = rate; | |
156 | n->next = db; | |
157 | db = n; | |
158 | } | |
159 | ||
160 | while (db) { | |
161 | n = db; | |
162 | db = db->next; | |
163 | n->next = kern_db; | |
164 | kern_db = n; | |
165 | } | |
166 | } | |
167 | ||
168 | static int count_spaces(const char *line) | |
169 | { | |
170 | int count = 0; | |
171 | char c; | |
172 | ||
173 | while ((c = *line++) != 0) | |
174 | count += c == ' ' || c == '\n'; | |
175 | return count; | |
176 | } | |
177 | ||
178 | static void load_ugly_table(FILE *fp) | |
179 | { | |
180 | char buf[2048]; | |
181 | struct nstat_ent *db = NULL; | |
182 | struct nstat_ent *n; | |
183 | ||
184 | while (fgets(buf, sizeof(buf), fp) != NULL) { | |
185 | char idbuf[4096]; | |
186 | int off; | |
187 | char *p; | |
188 | int count1, count2, skip = 0; | |
189 | ||
190 | p = strchr(buf, ':'); | |
191 | if (!p) | |
192 | abort(); | |
193 | count1 = count_spaces(buf); | |
194 | *p = 0; | |
195 | idbuf[0] = 0; | |
196 | strncat(idbuf, buf, sizeof(idbuf) - 1); | |
197 | off = p - buf; | |
198 | p += 2; | |
199 | ||
200 | while (*p) { | |
201 | char *next; | |
202 | ||
203 | if ((next = strchr(p, ' ')) != NULL) | |
204 | *next++ = 0; | |
205 | else if ((next = strchr(p, '\n')) != NULL) | |
206 | *next++ = 0; | |
207 | if (off < sizeof(idbuf)) { | |
208 | idbuf[off] = 0; | |
209 | strncat(idbuf, p, sizeof(idbuf) - off - 1); | |
210 | } | |
211 | n = malloc(sizeof(*n)); | |
212 | if (!n) | |
213 | abort(); | |
214 | n->id = strdup(idbuf); | |
215 | n->rate = 0; | |
216 | n->next = db; | |
217 | db = n; | |
218 | p = next; | |
219 | } | |
220 | n = db; | |
221 | if (fgets(buf, sizeof(buf), fp) == NULL) | |
222 | abort(); | |
223 | count2 = count_spaces(buf); | |
224 | if (count2 > count1) | |
225 | skip = count2 - count1; | |
226 | do { | |
227 | p = strrchr(buf, ' '); | |
228 | if (!p) | |
229 | abort(); | |
230 | *p = 0; | |
231 | if (sscanf(p+1, "%llu", &n->val) != 1) | |
232 | abort(); | |
233 | /* Trick to skip "dummy" trailing ICMP MIB in 2.4 */ | |
234 | if (skip) | |
235 | skip--; | |
236 | else | |
237 | n = n->next; | |
238 | } while (p > buf + off + 2); | |
239 | } | |
240 | ||
241 | while (db) { | |
242 | n = db; | |
243 | db = db->next; | |
244 | if (useless_number(n->id)) { | |
245 | free(n->id); | |
246 | free(n); | |
247 | } else { | |
248 | n->next = kern_db; | |
249 | kern_db = n; | |
250 | } | |
251 | } | |
252 | } | |
253 | ||
254 | static void load_sctp_snmp(void) | |
255 | { | |
256 | FILE *fp = fdopen(net_sctp_snmp_open(), "r"); | |
257 | ||
258 | if (fp) { | |
259 | load_good_table(fp); | |
260 | fclose(fp); | |
261 | } | |
262 | } | |
263 | ||
264 | static void load_snmp(void) | |
265 | { | |
266 | FILE *fp = fdopen(net_snmp_open(), "r"); | |
267 | ||
268 | if (fp) { | |
269 | load_ugly_table(fp); | |
270 | fclose(fp); | |
271 | } | |
272 | } | |
273 | ||
274 | static void load_snmp6(void) | |
275 | { | |
276 | FILE *fp = fdopen(net_snmp6_open(), "r"); | |
277 | ||
278 | if (fp) { | |
279 | load_good_table(fp); | |
280 | fclose(fp); | |
281 | } | |
282 | } | |
283 | ||
284 | static void load_netstat(void) | |
285 | { | |
286 | FILE *fp = fdopen(net_netstat_open(), "r"); | |
287 | ||
288 | if (fp) { | |
289 | load_ugly_table(fp); | |
290 | fclose(fp); | |
291 | } | |
292 | } | |
293 | ||
294 | ||
295 | static void dump_kern_db(FILE *fp, int to_hist) | |
296 | { | |
297 | json_writer_t *jw = json_output ? jsonw_new(fp) : NULL; | |
298 | struct nstat_ent *n, *h; | |
299 | ||
300 | h = hist_db; | |
301 | if (jw) { | |
302 | jsonw_start_object(jw); | |
303 | jsonw_pretty(jw, pretty); | |
304 | jsonw_name(jw, info_source); | |
305 | jsonw_start_object(jw); | |
306 | } else | |
307 | fprintf(fp, "#%s\n", info_source); | |
308 | ||
309 | for (n = kern_db; n; n = n->next) { | |
310 | unsigned long long val = n->val; | |
311 | ||
312 | if (!dump_zeros && !val && !n->rate) | |
313 | continue; | |
314 | if (!match(n->id)) { | |
315 | struct nstat_ent *h1; | |
316 | ||
317 | if (!to_hist) | |
318 | continue; | |
319 | for (h1 = h; h1; h1 = h1->next) { | |
320 | if (strcmp(h1->id, n->id) == 0) { | |
321 | val = h1->val; | |
322 | h = h1->next; | |
323 | break; | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
328 | if (jw) | |
329 | jsonw_uint_field(jw, n->id, val); | |
330 | else | |
331 | fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate); | |
332 | } | |
333 | ||
334 | if (jw) { | |
335 | jsonw_end_object(jw); | |
336 | ||
337 | jsonw_end_object(jw); | |
338 | jsonw_destroy(&jw); | |
339 | } | |
340 | } | |
341 | ||
342 | static void dump_incr_db(FILE *fp) | |
343 | { | |
344 | json_writer_t *jw = json_output ? jsonw_new(fp) : NULL; | |
345 | struct nstat_ent *n, *h; | |
346 | ||
347 | h = hist_db; | |
348 | if (jw) { | |
349 | jsonw_start_object(jw); | |
350 | jsonw_pretty(jw, pretty); | |
351 | jsonw_name(jw, info_source); | |
352 | jsonw_start_object(jw); | |
353 | } else | |
354 | fprintf(fp, "#%s\n", info_source); | |
355 | ||
356 | for (n = kern_db; n; n = n->next) { | |
357 | int ovfl = 0; | |
358 | unsigned long long val = n->val; | |
359 | struct nstat_ent *h1; | |
360 | ||
361 | for (h1 = h; h1; h1 = h1->next) { | |
362 | if (strcmp(h1->id, n->id) == 0) { | |
363 | if (val < h1->val) { | |
364 | ovfl = 1; | |
365 | val = h1->val; | |
366 | } | |
367 | val -= h1->val; | |
368 | h = h1->next; | |
369 | break; | |
370 | } | |
371 | } | |
372 | if (!dump_zeros && !val && !n->rate) | |
373 | continue; | |
374 | if (!match(n->id)) | |
375 | continue; | |
376 | ||
377 | if (jw) | |
378 | jsonw_uint_field(jw, n->id, val); | |
379 | else | |
380 | fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val, | |
381 | n->rate, ovfl?" (overflow)":""); | |
382 | } | |
383 | ||
384 | if (jw) { | |
385 | jsonw_end_object(jw); | |
386 | ||
387 | jsonw_end_object(jw); | |
388 | jsonw_destroy(&jw); | |
389 | } | |
390 | } | |
391 | ||
392 | static int children; | |
393 | ||
394 | static void sigchild(int signo) | |
395 | { | |
396 | } | |
397 | ||
398 | static void update_db(int interval) | |
399 | { | |
400 | struct nstat_ent *n, *h; | |
401 | ||
402 | n = kern_db; | |
403 | kern_db = NULL; | |
404 | ||
405 | load_netstat(); | |
406 | load_snmp6(); | |
407 | load_snmp(); | |
408 | load_sctp_snmp(); | |
409 | ||
410 | h = kern_db; | |
411 | kern_db = n; | |
412 | ||
413 | for (n = kern_db; n; n = n->next) { | |
414 | struct nstat_ent *h1; | |
415 | ||
416 | for (h1 = h; h1; h1 = h1->next) { | |
417 | if (strcmp(h1->id, n->id) == 0) { | |
418 | double sample; | |
419 | unsigned long long incr = h1->val - n->val; | |
420 | ||
421 | n->val = h1->val; | |
422 | sample = (double)incr * 1000.0 / interval; | |
423 | if (interval >= scan_interval) { | |
424 | n->rate += W*(sample-n->rate); | |
425 | } else if (interval >= 1000) { | |
426 | if (interval >= time_constant) { | |
427 | n->rate = sample; | |
428 | } else { | |
429 | double w = W*(double)interval/scan_interval; | |
430 | ||
431 | n->rate += w*(sample-n->rate); | |
432 | } | |
433 | } | |
434 | ||
435 | while (h != h1) { | |
436 | struct nstat_ent *tmp = h; | |
437 | ||
438 | h = h->next; | |
439 | free(tmp->id); | |
440 | free(tmp); | |
441 | }; | |
442 | h = h1->next; | |
443 | free(h1->id); | |
444 | free(h1); | |
445 | break; | |
446 | } | |
447 | } | |
448 | } | |
449 | } | |
450 | ||
451 | #define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000) | |
452 | ||
453 | ||
454 | static void server_loop(int fd) | |
455 | { | |
456 | struct timeval snaptime = { 0 }; | |
457 | struct pollfd p; | |
458 | ||
459 | p.fd = fd; | |
460 | p.events = p.revents = POLLIN; | |
461 | ||
462 | sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d", | |
463 | getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000); | |
464 | ||
465 | load_netstat(); | |
466 | load_snmp6(); | |
467 | load_snmp(); | |
468 | load_sctp_snmp(); | |
469 | ||
470 | for (;;) { | |
471 | int status; | |
472 | time_t tdiff; | |
473 | struct timeval now; | |
474 | ||
475 | gettimeofday(&now, NULL); | |
476 | tdiff = T_DIFF(now, snaptime); | |
477 | if (tdiff >= scan_interval) { | |
478 | update_db(tdiff); | |
479 | snaptime = now; | |
480 | tdiff = 0; | |
481 | } | |
482 | if (poll(&p, 1, scan_interval - tdiff) > 0 | |
483 | && (p.revents&POLLIN)) { | |
484 | int clnt = accept(fd, NULL, NULL); | |
485 | ||
486 | if (clnt >= 0) { | |
487 | pid_t pid; | |
488 | ||
489 | if (children >= 5) { | |
490 | close(clnt); | |
491 | } else if ((pid = fork()) != 0) { | |
492 | if (pid > 0) | |
493 | children++; | |
494 | close(clnt); | |
495 | } else { | |
496 | FILE *fp = fdopen(clnt, "w"); | |
497 | ||
498 | if (fp) | |
499 | dump_kern_db(fp, 0); | |
500 | exit(0); | |
501 | } | |
502 | } | |
503 | } | |
504 | while (children && waitpid(-1, &status, WNOHANG) > 0) | |
505 | children--; | |
506 | } | |
507 | } | |
508 | ||
509 | static int verify_forging(int fd) | |
510 | { | |
511 | struct ucred cred; | |
512 | socklen_t olen = sizeof(cred); | |
513 | ||
514 | if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) || | |
515 | olen < sizeof(cred)) | |
516 | return -1; | |
517 | if (cred.uid == getuid() || cred.uid == 0) | |
518 | return 0; | |
519 | return -1; | |
520 | } | |
521 | ||
522 | static void usage(void) __attribute__((noreturn)); | |
523 | ||
524 | static void usage(void) | |
525 | { | |
526 | fprintf(stderr, | |
527 | "Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n" | |
528 | " -h, --help this message\n" | |
529 | " -a, --ignore ignore history\n" | |
530 | " -d, --scan=SECS sample every statistics every SECS\n" | |
531 | " -j, --json format output in JSON\n" | |
532 | " -n, --nooutput do history only\n" | |
533 | " -p, --pretty pretty print\n" | |
534 | " -r, --reset reset history\n" | |
535 | " -s, --noupdate don't update history\n" | |
536 | " -t, --interval=SECS report average over the last SECS\n" | |
537 | " -V, --version output version information\n" | |
538 | " -z, --zeros show entries with zero activity\n"); | |
539 | exit(-1); | |
540 | } | |
541 | ||
542 | static const struct option longopts[] = { | |
543 | { "help", 0, 0, 'h' }, | |
544 | { "ignore", 0, 0, 'a' }, | |
545 | { "scan", 1, 0, 'd'}, | |
546 | { "nooutput", 0, 0, 'n' }, | |
547 | { "json", 0, 0, 'j' }, | |
548 | { "reset", 0, 0, 'r' }, | |
549 | { "noupdate", 0, 0, 's' }, | |
550 | { "pretty", 0, 0, 'p' }, | |
551 | { "interval", 1, 0, 't' }, | |
552 | { "version", 0, 0, 'V' }, | |
553 | { "zeros", 0, 0, 'z' }, | |
554 | { 0 } | |
555 | }; | |
556 | ||
557 | int main(int argc, char *argv[]) | |
558 | { | |
559 | char *hist_name; | |
560 | struct sockaddr_un sun; | |
561 | FILE *hist_fp = NULL; | |
562 | int ch; | |
563 | int fd; | |
564 | ||
565 | while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:jp", | |
566 | longopts, NULL)) != EOF) { | |
567 | switch (ch) { | |
568 | case 'z': | |
569 | dump_zeros = 1; | |
570 | break; | |
571 | case 'r': | |
572 | reset_history = 1; | |
573 | break; | |
574 | case 'a': | |
575 | ignore_history = 1; | |
576 | break; | |
577 | case 's': | |
578 | no_update = 1; | |
579 | break; | |
580 | case 'n': | |
581 | no_output = 1; | |
582 | break; | |
583 | case 'd': | |
584 | scan_interval = 1000*atoi(optarg); | |
585 | break; | |
586 | case 't': | |
587 | if (sscanf(optarg, "%d", &time_constant) != 1 || | |
588 | time_constant <= 0) { | |
589 | fprintf(stderr, "nstat: invalid time constant divisor\n"); | |
590 | exit(-1); | |
591 | } | |
592 | break; | |
593 | case 'j': | |
594 | json_output = 1; | |
595 | break; | |
596 | case 'p': | |
597 | pretty = 1; | |
598 | break; | |
599 | case 'v': | |
600 | case 'V': | |
601 | printf("nstat utility, iproute2-ss%s\n", SNAPSHOT); | |
602 | exit(0); | |
603 | case 'h': | |
604 | case '?': | |
605 | default: | |
606 | usage(); | |
607 | } | |
608 | } | |
609 | ||
610 | argc -= optind; | |
611 | argv += optind; | |
612 | ||
613 | sun.sun_family = AF_UNIX; | |
614 | sun.sun_path[0] = 0; | |
615 | sprintf(sun.sun_path+1, "nstat%d", getuid()); | |
616 | ||
617 | if (scan_interval > 0) { | |
618 | if (time_constant == 0) | |
619 | time_constant = 60; | |
620 | time_constant *= 1000; | |
621 | W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant); | |
622 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
623 | perror("nstat: socket"); | |
624 | exit(-1); | |
625 | } | |
626 | if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) { | |
627 | perror("nstat: bind"); | |
628 | exit(-1); | |
629 | } | |
630 | if (listen(fd, 5) < 0) { | |
631 | perror("nstat: listen"); | |
632 | exit(-1); | |
633 | } | |
634 | if (daemon(0, 0)) { | |
635 | perror("nstat: daemon"); | |
636 | exit(-1); | |
637 | } | |
638 | signal(SIGPIPE, SIG_IGN); | |
639 | signal(SIGCHLD, sigchild); | |
640 | server_loop(fd); | |
641 | exit(0); | |
642 | } | |
643 | ||
644 | patterns = argv; | |
645 | npatterns = argc; | |
646 | ||
647 | if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) { | |
648 | hist_name = malloc(128); | |
649 | sprintf(hist_name, "/tmp/.nstat.u%d", getuid()); | |
650 | } | |
651 | ||
652 | if (reset_history) | |
653 | unlink(hist_name); | |
654 | ||
655 | if (!ignore_history || !no_update) { | |
656 | struct stat stb; | |
657 | ||
658 | fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600); | |
659 | if (fd < 0) { | |
660 | perror("nstat: open history file"); | |
661 | exit(-1); | |
662 | } | |
663 | if ((hist_fp = fdopen(fd, "r+")) == NULL) { | |
664 | perror("nstat: fdopen history file"); | |
665 | exit(-1); | |
666 | } | |
667 | if (flock(fileno(hist_fp), LOCK_EX)) { | |
668 | perror("nstat: flock history file"); | |
669 | exit(-1); | |
670 | } | |
671 | if (fstat(fileno(hist_fp), &stb) != 0) { | |
672 | perror("nstat: fstat history file"); | |
673 | exit(-1); | |
674 | } | |
675 | if (stb.st_nlink != 1 || stb.st_uid != getuid()) { | |
676 | fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n"); | |
677 | exit(-1); | |
678 | } | |
679 | if (!ignore_history) { | |
680 | FILE *tfp; | |
681 | long uptime = -1; | |
682 | ||
683 | if ((tfp = fopen("/proc/uptime", "r")) != NULL) { | |
684 | if (fscanf(tfp, "%ld", &uptime) != 1) | |
685 | uptime = -1; | |
686 | fclose(tfp); | |
687 | } | |
688 | if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) { | |
689 | fprintf(stderr, "nstat: history is aged out, resetting\n"); | |
690 | if (ftruncate(fileno(hist_fp), 0) < 0) | |
691 | perror("nstat: ftruncate"); | |
692 | } | |
693 | } | |
694 | ||
695 | load_good_table(hist_fp); | |
696 | ||
697 | hist_db = kern_db; | |
698 | kern_db = NULL; | |
699 | } | |
700 | ||
701 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 && | |
702 | (connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0 | |
703 | || (strcpy(sun.sun_path+1, "nstat0"), | |
704 | connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0)) | |
705 | && verify_forging(fd) == 0) { | |
706 | FILE *sfp = fdopen(fd, "r"); | |
707 | ||
708 | if (!sfp) { | |
709 | fprintf(stderr, "nstat: fdopen failed: %s\n", | |
710 | strerror(errno)); | |
711 | close(fd); | |
712 | } else { | |
713 | load_good_table(sfp); | |
714 | if (hist_db && source_mismatch) { | |
715 | fprintf(stderr, "nstat: history is stale, ignoring it.\n"); | |
716 | hist_db = NULL; | |
717 | } | |
718 | fclose(sfp); | |
719 | } | |
720 | } else { | |
721 | if (fd >= 0) | |
722 | close(fd); | |
723 | if (hist_db && info_source[0] && strcmp(info_source, "kernel")) { | |
724 | fprintf(stderr, "nstat: history is stale, ignoring it.\n"); | |
725 | hist_db = NULL; | |
726 | info_source[0] = 0; | |
727 | } | |
728 | load_netstat(); | |
729 | load_snmp6(); | |
730 | load_snmp(); | |
731 | load_sctp_snmp(); | |
732 | if (info_source[0] == 0) | |
733 | strcpy(info_source, "kernel"); | |
734 | } | |
735 | ||
736 | if (!no_output) { | |
737 | if (ignore_history || hist_db == NULL) | |
738 | dump_kern_db(stdout, 0); | |
739 | else | |
740 | dump_incr_db(stdout); | |
741 | } | |
742 | if (!no_update) { | |
743 | if (ftruncate(fileno(hist_fp), 0) < 0) | |
744 | perror("nstat: ftruncate"); | |
745 | rewind(hist_fp); | |
746 | ||
747 | json_output = 0; | |
748 | dump_kern_db(hist_fp, 1); | |
749 | fclose(hist_fp); | |
750 | } | |
751 | exit(0); | |
752 | } |