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1 | /* | |
2 | ||
3 | Copyright (C) 2014 Proxmox Server Solutions GmbH | |
4 | ||
5 | This software is written by Proxmox Server Solutions GmbH <support@proxmox.com> | |
6 | ||
7 | This program is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU Affero General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU Affero General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Affero General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | ||
20 | Author: Dietmar Maurer <dietmar@proxmox.com> | |
21 | ||
22 | */ | |
23 | ||
24 | #define _GNU_SOURCE | |
25 | ||
26 | #include <stdlib.h> | |
27 | #include <stdio.h> | |
28 | #include <errno.h> | |
29 | #include <stdarg.h> | |
30 | #include <string.h> | |
31 | #include <signal.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <fcntl.h> | |
35 | #include <unistd.h> | |
36 | #include <arpa/inet.h> | |
37 | #include <sys/socket.h> | |
38 | #include <sys/file.h> | |
39 | #include <linux/netlink.h> | |
40 | #include <libnfnetlink/libnfnetlink.h> | |
41 | #include <libnetfilter_log/libnetfilter_log.h> | |
42 | #include <netinet/ip.h> | |
43 | #include <netinet/ip_icmp.h> | |
44 | #include <netinet/udp.h> | |
45 | #include <netinet/tcp.h> | |
46 | #include <netinet/if_ether.h> | |
47 | #include <syslog.h> | |
48 | ||
49 | #include <glib.h> | |
50 | #include <glib-unix.h> | |
51 | ||
52 | static struct nflog_handle *logh = NULL; | |
53 | static struct nlif_handle *nlifh = NULL; | |
54 | GMainLoop *main_loop; | |
55 | ||
56 | /* | |
57 | ||
58 | LOG FORMAT: | |
59 | ||
60 | Special care was taken to allow fast parsing (and filer messages for a singl VM). | |
61 | ||
62 | <VMID> <LOGLEVEL> <CHAIN> <TIME> <TIMEZONE> <MSG> | |
63 | ||
64 | Example: | |
65 | ||
66 | 117 6 tap117i0-IN 14/Mar/2014:12:47:07 +0100 policy REJECT: IN=vmbr1 ... | |
67 | ||
68 | */ | |
69 | ||
70 | #define LOGFILE "/var/log/pve-firewall.log" | |
71 | ||
72 | #define LOCKFILE "/var/lock/pvefw-logger.lck" | |
73 | #define PIDFILE "/var/run/pvefw-logger.pid" | |
74 | ||
75 | #define LQ_LEN 512 | |
76 | #define LE_MAX (512 - 4) // try to fit into 512 bytes | |
77 | ||
78 | #define MAX_CHAIN_LEN 28 | |
79 | ||
80 | struct log_entry { | |
81 | guint32 len; // max LE_MAX chars | |
82 | char buf[LE_MAX]; | |
83 | }; | |
84 | ||
85 | #define STATIC_ASSERT(cond) \ | |
86 | extern void pve_static_assert(int test[(cond) ? 1 : -1]) | |
87 | ||
88 | STATIC_ASSERT(sizeof(struct log_entry) == 512); | |
89 | ||
90 | int outfd = -1; | |
91 | ||
92 | gboolean terminate_threads = FALSE; | |
93 | ||
94 | static gboolean write_pidfile(pid_t pid) | |
95 | { | |
96 | gboolean res; | |
97 | ||
98 | char *strpid = g_strdup_printf("%d\n", pid); | |
99 | res = g_file_set_contents(PIDFILE, strpid, strlen(strpid), NULL); | |
100 | g_free(strpid); | |
101 | ||
102 | return res; | |
103 | } | |
104 | ||
105 | static GAsyncQueue *queue; | |
106 | ||
107 | ssize_t | |
108 | safe_write(int fd, char *buf, size_t count) | |
109 | { | |
110 | ssize_t n; | |
111 | ||
112 | do { | |
113 | n = write(fd, buf, count); | |
114 | } while (n < 0 && errno == EINTR); | |
115 | ||
116 | return n; | |
117 | } | |
118 | ||
119 | static gpointer | |
120 | log_writer_thread(gpointer data) | |
121 | { | |
122 | while (1) { | |
123 | struct log_entry *le = (struct log_entry *)g_async_queue_timeout_pop(queue, 250000); | |
124 | if (le == NULL) { | |
125 | if (terminate_threads) { | |
126 | return NULL; | |
127 | } | |
128 | continue; | |
129 | } | |
130 | ||
131 | int res = safe_write(outfd, le->buf, le->len); | |
132 | ||
133 | g_free(le); | |
134 | ||
135 | if (res < 0) { | |
136 | syslog(3, "writing log failed, stopping daemon - %s", strerror (errno)); | |
137 | g_main_loop_quit(main_loop); | |
138 | return NULL; | |
139 | } | |
140 | } | |
141 | ||
142 | return NULL; | |
143 | } | |
144 | ||
145 | static int skipped_logs = 0; | |
146 | ||
147 | static void log_status_message(guint loglevel, const char *fmt, ...); | |
148 | ||
149 | static void | |
150 | queue_log_entry(struct log_entry *le) | |
151 | { | |
152 | gint len = g_async_queue_length(queue); | |
153 | ||
154 | if (skipped_logs > 0) { | |
155 | if (len >= (LQ_LEN - 1)) { | |
156 | skipped_logs++; | |
157 | } else { | |
158 | int skip_tmp = skipped_logs; | |
159 | skipped_logs = 0; // clear before calling log_status_message() | |
160 | log_status_message(3, "skipped %d log entries (queue full)", skip_tmp); | |
161 | g_async_queue_push(queue, le); | |
162 | } | |
163 | } else { | |
164 | if (len >= LQ_LEN) { | |
165 | skipped_logs++; | |
166 | } else { | |
167 | g_async_queue_push(queue, le); | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
172 | ||
173 | #define LEPRINTF(format, ...) { if (le->len < LE_MAX) le->len += snprintf(le->buf + le->len, LE_MAX - le->len, format, ##__VA_ARGS__); } | |
174 | #define LEPRINTTIME(sec) { time_t tmp_sec = sec; if (le->len < (LE_MAX - 30)) le->len += strftime(le->buf + le->len, LE_MAX - le->len, "%d/%b/%Y:%H:%M:%S %z ", localtime(&tmp_sec)); } | |
175 | ||
176 | static void | |
177 | log_status_message(guint loglevel, const char *fmt, ...) | |
178 | { | |
179 | va_list ap; | |
180 | va_start(ap, fmt); | |
181 | ||
182 | if (loglevel > 7 ) loglevel = 7; // syslog defines level 0-7 | |
183 | ||
184 | struct log_entry *le = g_new0(struct log_entry, 1); | |
185 | ||
186 | LEPRINTF("0 %d - ", loglevel); | |
187 | ||
188 | LEPRINTTIME(time(NULL)); | |
189 | ||
190 | le->len += vsnprintf(le->buf + le->len, LE_MAX - le->len, fmt, ap); | |
191 | ||
192 | LEPRINTF("\n"); | |
193 | ||
194 | queue_log_entry(le); | |
195 | ||
196 | // also log to syslog | |
197 | ||
198 | vsyslog(loglevel, fmt, ap); | |
199 | } | |
200 | ||
201 | static int | |
202 | print_tcp(struct log_entry *le, struct tcphdr *h, int payload_len) | |
203 | { | |
204 | LEPRINTF("PROTO=TCP "); | |
205 | ||
206 | if (payload_len < sizeof(struct tcphdr)) { | |
207 | LEPRINTF("LEN=%d ", payload_len); | |
208 | LEPRINTF("INVALID=LEN "); | |
209 | return -1; | |
210 | } | |
211 | ||
212 | LEPRINTF("SPT=%u DPT=%u ", ntohs(h->source), ntohs(h->dest)); | |
213 | LEPRINTF("SEQ=%u ACK=%u ", ntohl(h->seq), ntohl(h->ack_seq)); | |
214 | LEPRINTF("WINDOW=%u ", ntohs(h->window)); | |
215 | ||
216 | if (h->urg) LEPRINTF("URG "); | |
217 | if (h->ack) LEPRINTF("ACK "); | |
218 | if (h->psh) LEPRINTF("PSH "); | |
219 | if (h->rst) LEPRINTF("RST "); | |
220 | if (h->syn) LEPRINTF("SYN "); | |
221 | if (h->fin) LEPRINTF("FIN "); | |
222 | ||
223 | if (h->urg) LEPRINTF("URGP=%u ",ntohs(h->urg_ptr)); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static int | |
229 | print_udp(struct log_entry *le, struct udphdr *h, int payload_len) | |
230 | { | |
231 | LEPRINTF("PROTO=UDP "); | |
232 | ||
233 | if (payload_len < sizeof(struct udphdr)) { | |
234 | LEPRINTF("LEN=%d ", payload_len); | |
235 | LEPRINTF("INVALID=LEN "); | |
236 | return -1; | |
237 | } | |
238 | ||
239 | LEPRINTF("SPT=%u DPT=%u LEN=%u", ntohs(h->source), ntohs(h->dest), ntohs(h->len)); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int | |
245 | print_icmp(struct log_entry *le, struct icmphdr *h, int payload_len) | |
246 | { | |
247 | char tmp[INET_ADDRSTRLEN]; | |
248 | u_int32_t gateway; | |
249 | ||
250 | LEPRINTF("PROTO=ICMP "); | |
251 | ||
252 | if (payload_len < sizeof(struct icmphdr)) { | |
253 | LEPRINTF("LEN=%d ", payload_len); | |
254 | LEPRINTF("INVALID=LEN "); | |
255 | return -1; | |
256 | } | |
257 | ||
258 | LEPRINTF("TYPE=%u CODE=%u ", h->type, h->code); | |
259 | ||
260 | switch (h->type) { | |
261 | case ICMP_ECHO: | |
262 | case ICMP_ECHOREPLY: | |
263 | LEPRINTF("ID=%u SEQ=%u ", ntohs(h->un.echo.id), ntohs(h->un.echo.sequence)); | |
264 | break; | |
265 | case ICMP_PARAMETERPROB: | |
266 | LEPRINTF("PARAMETER=%u ", ntohl(h->un.gateway) >> 24); | |
267 | break; | |
268 | case ICMP_REDIRECT: | |
269 | gateway = ntohl(h->un.gateway); | |
270 | inet_ntop(AF_INET, &gateway, tmp, sizeof(tmp)); | |
271 | LEPRINTF("GATEWAY=%s ", tmp); | |
272 | break; | |
273 | case ICMP_DEST_UNREACH: | |
274 | if (h->code == ICMP_FRAG_NEEDED) { | |
275 | LEPRINTF("MTU=%u ", ntohs(h->un.frag.mtu)); | |
276 | } | |
277 | break; | |
278 | } | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | /* Section 3.1. SCTP Common Header Format */ | |
284 | typedef struct sctphdr { | |
285 | __be16 source; | |
286 | __be16 dest; | |
287 | __be32 vtag; | |
288 | __be32 checksum; | |
289 | } __attribute__((packed)) sctp_sctphdr_t; | |
290 | ||
291 | static int | |
292 | print_sctp(struct log_entry *le, struct sctphdr *h, int payload_len) | |
293 | { | |
294 | LEPRINTF("PROTO=SCTP "); | |
295 | ||
296 | if (payload_len < sizeof(struct sctphdr)) { | |
297 | LEPRINTF("LEN=%d ", payload_len); | |
298 | LEPRINTF("INVALID=LEN "); | |
299 | return -1; | |
300 | } | |
301 | ||
302 | LEPRINTF("SPT=%u DPT=%u ", ntohs(h->source), ntohs(h->dest)); | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | static int | |
308 | print_iphdr(struct log_entry *le, char * payload, int payload_len) | |
309 | { | |
310 | if (payload_len < sizeof(struct iphdr)) { | |
311 | LEPRINTF("LEN=%d ", payload_len); | |
312 | LEPRINTF("INVALID=LEN "); | |
313 | return -1; | |
314 | } | |
315 | ||
316 | struct iphdr *h = (struct iphdr *)payload; | |
317 | ||
318 | if (payload_len <= (u_int32_t)(h->ihl * 4)) { | |
319 | LEPRINTF("INVALID=IHL "); | |
320 | return -1; | |
321 | } | |
322 | ||
323 | char tmp[INET_ADDRSTRLEN]; | |
324 | ||
325 | inet_ntop(AF_INET, &h->saddr, tmp, sizeof(tmp)); | |
326 | LEPRINTF("SRC=%s ", tmp); | |
327 | inet_ntop(AF_INET, &h->daddr, tmp, sizeof(tmp)); | |
328 | LEPRINTF("DST=%s ", tmp); | |
329 | ||
330 | LEPRINTF("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ", | |
331 | ntohs(h->tot_len), h->tos & IPTOS_TOS_MASK, | |
332 | h->tos & IPTOS_PREC_MASK, h->ttl, ntohs(h->id)); | |
333 | ||
334 | short ip_off = ntohs(h->frag_off); | |
335 | if (ip_off & IP_OFFMASK) | |
336 | LEPRINTF("FRAG=%u ", ip_off & IP_OFFMASK); | |
337 | ||
338 | if (ip_off & IP_DF) LEPRINTF("DF "); | |
339 | if (ip_off & IP_MF) LEPRINTF("MF "); | |
340 | ||
341 | void *nexthdr = (u_int32_t *)h + h->ihl; | |
342 | payload_len -= h->ihl * 4; | |
343 | ||
344 | switch (h->protocol) { | |
345 | case IPPROTO_TCP: | |
346 | print_tcp(le, (struct tcphdr *)nexthdr, payload_len); | |
347 | break; | |
348 | case IPPROTO_UDP: | |
349 | print_udp(le, (struct udphdr *)nexthdr, payload_len); | |
350 | break; | |
351 | case IPPROTO_ICMP: | |
352 | print_icmp(le, (struct icmphdr *)nexthdr, payload_len); | |
353 | break; | |
354 | case IPPROTO_SCTP: | |
355 | print_sctp(le, (struct sctphdr *)nexthdr, payload_len); | |
356 | break; | |
357 | case IPPROTO_AH: | |
358 | LEPRINTF("PROTO=AH "); | |
359 | break; | |
360 | case IPPROTO_ESP: | |
361 | LEPRINTF("PROTO=ESP "); | |
362 | break; | |
363 | case IPPROTO_IGMP: | |
364 | LEPRINTF("PROTO=IGMP "); | |
365 | break; | |
366 | default: | |
367 | LEPRINTF("PROTO=%u ", h->protocol); | |
368 | } | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static int | |
374 | print_ip6hdr(struct log_entry *le, char * payload, int payload_len) | |
375 | { | |
376 | LEPRINTF("IPV6 logging not implemented "); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | // ebtables -I FORWARD --nflog --nflog-group 0 | |
382 | static int | |
383 | print_arp(struct log_entry *le, struct ether_arp *h, int payload_len) | |
384 | { | |
385 | if (payload_len < sizeof(struct ether_arp)) { | |
386 | LEPRINTF("LEN=%d ", payload_len); | |
387 | LEPRINTF("INVALID=LEN "); | |
388 | return -1; | |
389 | } | |
390 | ||
391 | LEPRINTF("SRC=%u.%u.%u.%u ", h->arp_spa[0], h->arp_spa[1], | |
392 | h->arp_spa[2], h->arp_spa[3]); | |
393 | ||
394 | LEPRINTF("DST=%u.%u.%u.%u ", h->arp_tpa[0], h->arp_tpa[1], | |
395 | h->arp_tpa[2], h->arp_tpa[3]); | |
396 | ||
397 | LEPRINTF("PROTO=ARP "); | |
398 | ||
399 | unsigned short code = ntohs(h->arp_op); | |
400 | switch (code) { | |
401 | case ARPOP_REQUEST: | |
402 | LEPRINTF("REQUEST "); | |
403 | break; | |
404 | case ARPOP_REPLY: | |
405 | LEPRINTF("REPLY MAC=%02x:%02x:%02x:%02x:%02x:%02x ", | |
406 | h->arp_sha[0], h->arp_sha[1], h->arp_sha[2], | |
407 | h->arp_sha[3], h->arp_sha[4], h->arp_sha[5]); | |
408 | break; | |
409 | case ARPOP_NAK: | |
410 | LEPRINTF("NAK "); | |
411 | break; | |
412 | default: | |
413 | LEPRINTF("CODE=%u ", code); | |
414 | } | |
415 | ||
416 | ||
417 | // LEPRINTF("HTYPE=%u ", ntohs(h->arp_hrd)); | |
418 | ||
419 | // LEPRINTF("PTYPE=%u ", ntohs(h->arp_pro)); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | ||
425 | static int print_pkt(struct log_entry *le, struct nflog_data *ldata, u_int8_t family) | |
426 | { | |
427 | u_int32_t mark = nflog_get_nfmark(ldata); | |
428 | u_int32_t indev = nflog_get_indev(ldata); | |
429 | u_int32_t outdev = nflog_get_outdev(ldata); | |
430 | u_int32_t physindev = nflog_get_physindev(ldata); | |
431 | u_int32_t physoutdev = nflog_get_physoutdev(ldata); | |
432 | ||
433 | char *prefix = nflog_get_prefix(ldata); | |
434 | char *payload; | |
435 | char devname[256]; | |
436 | ||
437 | guint32 vmid = 0; | |
438 | ||
439 | guint8 log_level = 6; // info | |
440 | ||
441 | char *chain_name = "-"; | |
442 | ||
443 | if (prefix != NULL) { | |
444 | // Note: parse ":$vmid:$loglevel:$chain: $msg" | |
445 | if (prefix[0] == ':') { | |
446 | char *p = prefix + 1; | |
447 | guint32 tmpid = 0; | |
448 | while(*p >= '0' && *p <= '9') { tmpid *= 10; tmpid += *p - '0'; p++; } | |
449 | ||
450 | if ((*p == ':') && | |
451 | (p[1] >= '0' && p[1] <= '7') && | |
452 | (p[2] == ':')) { | |
453 | ||
454 | guint8 tmp_level = p[1] - '0'; // store for later use | |
455 | char *chain_start = p + 3; // store for later use | |
456 | p = chain_start; | |
457 | while (*p && *p != ':' && *p != ' ') p++; | |
458 | int len = p - chain_start; | |
459 | ||
460 | if (*p == ':' && p[1] == ' ' && len && (len <= MAX_CHAIN_LEN)) { | |
461 | // parsing successful | |
462 | ||
463 | *p = 0; // terminate string | |
464 | ||
465 | vmid = tmpid; | |
466 | log_level = tmp_level; | |
467 | chain_name = chain_start; | |
468 | prefix = p + 2; // the rest | |
469 | } | |
470 | } | |
471 | } | |
472 | } | |
473 | ||
474 | LEPRINTF("%d ", vmid); | |
475 | ||
476 | LEPRINTF("%d ", log_level); | |
477 | ||
478 | LEPRINTF("%s ", chain_name); | |
479 | ||
480 | struct timeval ts; | |
481 | nflog_get_timestamp(ldata, &ts); | |
482 | ||
483 | LEPRINTTIME(ts.tv_sec); | |
484 | ||
485 | if (prefix != NULL) { | |
486 | LEPRINTF("%s", prefix); | |
487 | } | |
488 | ||
489 | if (indev > 0) { | |
490 | if (nlif_index2name(nlifh, indev, devname) != -1) { | |
491 | LEPRINTF("IN=%s ", devname); | |
492 | } else { | |
493 | LEPRINTF("IN=%u ", indev); | |
494 | } | |
495 | } | |
496 | ||
497 | if (outdev > 0) { | |
498 | if (nlif_index2name(nlifh, outdev, devname) != -1) { | |
499 | LEPRINTF("OUT=%s ", devname); | |
500 | } else { | |
501 | LEPRINTF("OUT=%u ", outdev); | |
502 | } | |
503 | } | |
504 | ||
505 | if (physindev > 0) { | |
506 | if (nlif_index2name(nlifh, physindev, devname) != -1) { | |
507 | LEPRINTF("PHYSIN=%s ", devname); | |
508 | } else { | |
509 | LEPRINTF("PHYSIN=%u ", physindev); | |
510 | } | |
511 | } | |
512 | ||
513 | if (physoutdev > 0) { | |
514 | if (nlif_index2name(nlifh, physoutdev, devname) != -1) { | |
515 | LEPRINTF("PHYSOUT=%s ", devname); | |
516 | } else { | |
517 | LEPRINTF("PHYSOUT=%u ", physoutdev); | |
518 | } | |
519 | } | |
520 | ||
521 | int payload_len = nflog_get_payload(ldata, &payload); | |
522 | ||
523 | int hwhdrlen = nflog_get_msg_packet_hwhdrlen(ldata); | |
524 | if (hwhdrlen > 0) { | |
525 | unsigned char *hwhdr = (unsigned char *)nflog_get_msg_packet_hwhdr(ldata); | |
526 | if (hwhdr != NULL) { | |
527 | int i; | |
528 | LEPRINTF("MAC="); | |
529 | for (i = 0; i < hwhdrlen; i++) { | |
530 | LEPRINTF("%02x", hwhdr[i]); | |
531 | if (i < (hwhdrlen -1 )) LEPRINTF(":"); | |
532 | } | |
533 | LEPRINTF(" "); | |
534 | } | |
535 | } | |
536 | ||
537 | u_int16_t hw_protocol = 0; | |
538 | struct nfulnl_msg_packet_hdr *ph = NULL; | |
539 | ||
540 | switch (family) { | |
541 | case AF_INET: | |
542 | print_iphdr(le, payload, payload_len); | |
543 | break; | |
544 | case AF_INET6: | |
545 | print_ip6hdr(le, payload, payload_len); | |
546 | break; | |
547 | case AF_BRIDGE: | |
548 | ph = nflog_get_msg_packet_hdr(ldata); | |
549 | if (ph) hw_protocol = ntohs(ph->hw_protocol); | |
550 | ||
551 | switch (hw_protocol) { | |
552 | case ETH_P_IP: | |
553 | print_iphdr(le, payload, payload_len); | |
554 | break; | |
555 | case ETH_P_IPV6: | |
556 | print_ip6hdr(le, payload, payload_len); | |
557 | break; | |
558 | case ETH_P_ARP: | |
559 | print_arp(le, (struct ether_arp *)payload, payload_len); | |
560 | break; | |
561 | } | |
562 | break; | |
563 | } | |
564 | ||
565 | if (mark) LEPRINTF("mark=%u ", mark); | |
566 | ||
567 | ||
568 | return 0; | |
569 | ||
570 | } | |
571 | ||
572 | static int | |
573 | nflog_cb(struct nflog_g_handle *gh, struct nfgenmsg *nfmsg, | |
574 | struct nflog_data *nfa, void *data) | |
575 | { | |
576 | struct log_entry *le = g_new0(struct log_entry, 1); | |
577 | ||
578 | print_pkt(le, nfa, nfmsg->nfgen_family); | |
579 | ||
580 | LEPRINTF("\n"); // add newline | |
581 | ||
582 | queue_log_entry(le); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static gboolean | |
588 | nflog_read_cb(GIOChannel *source, | |
589 | GIOCondition condition, | |
590 | gpointer data) | |
591 | { | |
592 | int rv = 0; | |
593 | gchar buf[8192]; | |
594 | ||
595 | int fd = g_io_channel_unix_get_fd(source); | |
596 | ||
597 | if ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) { | |
598 | nflog_handle_packet(logh, buf, rv); | |
599 | } | |
600 | ||
601 | return TRUE; | |
602 | } | |
603 | ||
604 | static gboolean | |
605 | nlif_read_cb(GIOChannel *source, | |
606 | GIOCondition condition, | |
607 | gpointer data) | |
608 | { | |
609 | static int last_res = 0; | |
610 | int res; | |
611 | ||
612 | if ((res = nlif_catch(nlifh)) < 0) { | |
613 | if (last_res == 0) { // only report once | |
614 | log_status_message(3, "nlif_catch failed (res = %d)", res); | |
615 | } | |
616 | last_res = res; | |
617 | } else { | |
618 | last_res = 0; | |
619 | } | |
620 | ||
621 | return TRUE; | |
622 | } | |
623 | ||
624 | static gboolean | |
625 | terminate_request(gpointer data) | |
626 | { | |
627 | terminate_threads = TRUE; | |
628 | ||
629 | log_status_message(5, "received terminate request (signal)"); | |
630 | ||
631 | g_main_loop_quit(main_loop); | |
632 | ||
633 | return TRUE; | |
634 | } | |
635 | ||
636 | ||
637 | int | |
638 | main(int argc, char *argv[]) | |
639 | { | |
640 | int lockfd = -1; | |
641 | gboolean foreground = FALSE; | |
642 | gboolean wrote_pidfile = FALSE; | |
643 | ||
644 | g_thread_init(NULL); | |
645 | ||
646 | openlog("pvepw-logger", LOG_CONS|LOG_PID, LOG_DAEMON); | |
647 | ||
648 | if ((lockfd = open(LOCKFILE, O_RDWR|O_CREAT|O_APPEND, 0644)) == -1) { | |
649 | fprintf(stderr, "unable to create lock '%s': %s", LOCKFILE, strerror (errno) ); | |
650 | exit(-1); | |
651 | } | |
652 | ||
653 | for (int i = 10; i >= 0; i--) { | |
654 | if (flock(lockfd, LOCK_EX|LOCK_NB) != 0) { | |
655 | if (!i) { | |
656 | fprintf(stderr, "unable to aquire lock '%s': %s", LOCKFILE, strerror (errno)); | |
657 | exit(-1); | |
658 | } | |
659 | if (i == 10) | |
660 | fprintf(stderr, "unable to aquire lock '%s' - trying again.\n", LOCKFILE); | |
661 | ||
662 | sleep(1); | |
663 | } | |
664 | } | |
665 | ||
666 | if ((outfd = open(LOGFILE, O_WRONLY|O_CREAT|O_APPEND, 0644)) == -1) { | |
667 | fprintf(stderr, "unable to open file '%s': %s", LOGFILE, strerror (errno)); | |
668 | exit(-1); | |
669 | } | |
670 | ||
671 | if ((logh = nflog_open()) == NULL) { | |
672 | fprintf(stderr, "unable to open nflog\n"); | |
673 | exit(-1); | |
674 | } | |
675 | ||
676 | if (!nflog_bind_pf(logh, AF_INET) <= 0) { | |
677 | fprintf(stderr, "nflog_bind_pf AF_INET failed\n"); | |
678 | exit(-1); | |
679 | } | |
680 | ||
681 | #if 0 | |
682 | if (!nflog_bind_pf(logh, AF_INET6) <= 0) { | |
683 | fprintf(stderr, "nflog_bind_pf AF_INET6 failed\n"); | |
684 | exit(-1); | |
685 | } | |
686 | #endif | |
687 | ||
688 | if (!nflog_bind_pf(logh, AF_BRIDGE) <= 0) { | |
689 | fprintf(stderr, "nflog_bind_pf AF_BRIDGE failed\n"); | |
690 | exit(-1); | |
691 | } | |
692 | ||
693 | struct nflog_g_handle *qh = nflog_bind_group(logh, 0); | |
694 | if (!qh) { | |
695 | fprintf(stderr, "no handle for group 1\n"); | |
696 | exit(-1); | |
697 | } | |
698 | ||
699 | if (nflog_set_mode(qh, NFULNL_COPY_PACKET, 0xffff) < 0) { | |
700 | fprintf(stderr, "can't set packet copy mode\n"); | |
701 | exit(-1); | |
702 | } | |
703 | ||
704 | if ((nlifh = nlif_open()) == NULL) { | |
705 | fprintf(stderr, "unable to open netlink interface handle\n"); | |
706 | exit(-1); | |
707 | } | |
708 | ||
709 | if (!foreground) { | |
710 | pid_t cpid = fork(); | |
711 | ||
712 | if (cpid == -1) { | |
713 | fprintf(stderr, "failed to daemonize program - %s\n", strerror (errno)); | |
714 | exit(-1); | |
715 | } else if (cpid) { | |
716 | write_pidfile(cpid); | |
717 | _exit(0); | |
718 | } else { | |
719 | int nullfd; | |
720 | ||
721 | if (chroot("/") != 0) fprintf(stderr, "chroot '/' failed - %s\n", strerror (errno)); | |
722 | ||
723 | if ((nullfd = open("/dev/null", O_RDWR, 0)) != -1) { | |
724 | dup2(nullfd, 0); | |
725 | dup2(nullfd, 1); | |
726 | dup2(nullfd, 2); | |
727 | if (nullfd > 2) | |
728 | close (nullfd); | |
729 | } | |
730 | ||
731 | setsid(); | |
732 | } | |
733 | } else { | |
734 | write_pidfile(getpid()); | |
735 | } | |
736 | ||
737 | wrote_pidfile = TRUE; | |
738 | ||
739 | nflog_callback_register(qh, &nflog_cb, logh); | |
740 | ||
741 | queue = g_async_queue_new_full(g_free); | |
742 | ||
743 | log_status_message(5, "starting pvefw logger"); | |
744 | ||
745 | nlif_query(nlifh); | |
746 | ||
747 | GIOChannel *nlif_ch = g_io_channel_unix_new(nlif_fd(nlifh)); | |
748 | ||
749 | g_io_add_watch(nlif_ch, G_IO_IN, nlif_read_cb, NULL); | |
750 | ||
751 | int logfd = nflog_fd(logh); | |
752 | GIOChannel *nflog_ch = g_io_channel_unix_new(logfd); | |
753 | ||
754 | g_io_add_watch(nflog_ch, G_IO_IN, nflog_read_cb, NULL); | |
755 | ||
756 | GThread *wthread = g_thread_new("log_writer_thread", log_writer_thread, NULL); | |
757 | ||
758 | main_loop = g_main_loop_new(NULL, TRUE); | |
759 | ||
760 | g_unix_signal_add(SIGINT, terminate_request, NULL); | |
761 | g_unix_signal_add(SIGTERM, terminate_request, NULL); | |
762 | ||
763 | g_main_loop_run(main_loop); | |
764 | ||
765 | log_status_message(5, "stopping pvefw logger"); | |
766 | ||
767 | g_thread_join(wthread); | |
768 | ||
769 | close(outfd); | |
770 | ||
771 | nflog_close(logh); | |
772 | ||
773 | if (wrote_pidfile) | |
774 | unlink(PIDFILE); | |
775 | ||
776 | exit(0); | |
777 | } |