3 Copyright (C) 2014 Proxmox Server Solutions GmbH
5 This software is written by Proxmox Server Solutions GmbH <support@proxmox.com>
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.
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.
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/>.
20 Author: Dietmar Maurer <dietmar@proxmox.com>
32 #include <sys/types.h>
36 #include <arpa/inet.h>
37 #include <sys/socket.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>
49 #include <glib-unix.h>
51 static struct nflog_handle
*logh
= NULL
;
52 static struct nlif_handle
*nlifh
= NULL
;
54 #define LOGFILE "/var/log/pve-firewall.log"
56 #define LOCKFILE "/var/lock/pvefw-logger.lck"
57 #define PIDFILE "/var/run/pvefw-logger.pid"
60 #define LE_MAX (512 - 16) // try to fit into 512 bytes
63 guint32 len
; // max LE_MAX chars
69 gboolean terminate_threads
= FALSE
;
71 static gboolean
write_pidfile(pid_t pid
)
75 char *strpid
= g_strdup_printf("%d\n", pid
);
76 res
= g_file_set_contents(PIDFILE
, strpid
, strlen(strpid
), NULL
);
82 static GAsyncQueue
*queue
;
85 safe_write(int fd
, char *buf
, size_t count
)
90 n
= write(fd
, buf
, count
);
91 } while (n
< 0 && errno
== EINTR
);
97 log_writer_thread(gpointer data
)
100 struct log_entry
*le
= (struct log_entry
*)g_async_queue_timeout_pop(queue
, 250000);
102 if (terminate_threads
) {
108 int res
= safe_write(outfd
, le
->buf
, le
->len
);
113 // printf("write failed\n"); // fixme??
120 static int skipped_logs
= 0;
122 static void log_status_message(const char *fmt
, ...);
125 queue_log_entry(struct log_entry
*le
)
127 gint len
= g_async_queue_length(queue
);
129 if (skipped_logs
> 0) {
130 if (len
>= (LQ_LEN
- 1)) {
133 int skip_tmp
= skipped_logs
;
134 skipped_logs
= 0; // clear before calling log_status_message()
135 log_status_message("skipped %d log entries (queue full)", skip_tmp
);
136 g_async_queue_push(queue
, le
);
142 g_async_queue_push(queue
, le
);
148 #define LEPRINTF(format, ...) { if (le->len < LE_MAX) le->len += snprintf(le->buf + le->len, LE_MAX - le->len, format, ##__VA_ARGS__); }
149 #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)); }
152 log_status_message(const char *fmt
, ...)
157 struct log_entry
*le
= g_new0(struct log_entry
, 1);
159 LEPRINTTIME(time(NULL
));
161 le
->len
+= vsnprintf(le
->buf
+ le
->len
, LE_MAX
- le
->len
, fmt
, ap
);
169 print_tcp(struct log_entry
*le
, struct tcphdr
*h
, int payload_len
)
171 LEPRINTF("PROTO=TCP ");
173 if (payload_len
< sizeof(struct tcphdr
)) {
174 LEPRINTF("LEN=%d ", payload_len
);
175 LEPRINTF("INVALID=LEN ");
179 LEPRINTF("SPT=%u DPT=%u ", ntohs(h
->source
), ntohs(h
->dest
));
180 LEPRINTF("SEQ=%u ACK=%u ", ntohl(h
->seq
), ntohl(h
->ack_seq
));
181 LEPRINTF("WINDOW=%u ", ntohs(h
->window
));
183 if (h
->urg
) LEPRINTF("URG ");
184 if (h
->ack
) LEPRINTF("ACK ");
185 if (h
->psh
) LEPRINTF("PSH ");
186 if (h
->rst
) LEPRINTF("RST ");
187 if (h
->syn
) LEPRINTF("SYN ");
188 if (h
->fin
) LEPRINTF("FIN ");
190 if (h
->urg
) LEPRINTF("URGP=%u ",ntohs(h
->urg_ptr
));
196 print_udp(struct log_entry
*le
, struct udphdr
*h
, int payload_len
)
198 LEPRINTF("PROTO=UDP ");
200 if (payload_len
< sizeof(struct udphdr
)) {
201 LEPRINTF("LEN=%d ", payload_len
);
202 LEPRINTF("INVALID=LEN ");
206 LEPRINTF("SPT=%u DPT=%u LEN=%u", ntohs(h
->source
), ntohs(h
->dest
), ntohs(h
->len
));
212 print_icmp(struct log_entry
*le
, struct icmphdr
*h
, int payload_len
)
214 char tmp
[INET_ADDRSTRLEN
];
217 LEPRINTF("PROTO=ICMP ");
219 if (payload_len
< sizeof(struct icmphdr
)) {
220 LEPRINTF("LEN=%d ", payload_len
);
221 LEPRINTF("INVALID=LEN ");
225 LEPRINTF("TYPE=%u CODE=%u ", h
->type
, h
->code
);
230 LEPRINTF("ID=%u SEQ=%u ", ntohs(h
->un
.echo
.id
), ntohs(h
->un
.echo
.sequence
));
232 case ICMP_PARAMETERPROB
:
233 LEPRINTF("PARAMETER=%u ", ntohl(h
->un
.gateway
) >> 24);
236 gateway
= ntohl(h
->un
.gateway
);
237 inet_ntop(AF_INET
, &gateway
, tmp
, sizeof(tmp
));
238 LEPRINTF("GATEWAY=%s ", tmp
);
240 case ICMP_DEST_UNREACH
:
241 if (h
->code
== ICMP_FRAG_NEEDED
) {
242 LEPRINTF("MTU=%u ", ntohs(h
->un
.frag
.mtu
));
250 /* Section 3.1. SCTP Common Header Format */
251 typedef struct sctphdr
{
256 } __attribute__((packed
)) sctp_sctphdr_t
;
259 print_sctp(struct log_entry
*le
, struct sctphdr
*h
, int payload_len
)
261 LEPRINTF("PROTO=SCTP ");
263 if (payload_len
< sizeof(struct sctphdr
)) {
264 LEPRINTF("LEN=%d ", payload_len
);
265 LEPRINTF("INVALID=LEN ");
269 LEPRINTF("SPT=%u DPT=%u ", ntohs(h
->source
), ntohs(h
->dest
));
275 print_iphdr(struct log_entry
*le
, char * payload
, int payload_len
)
277 if (payload_len
< sizeof(struct iphdr
)) {
278 LEPRINTF("LEN=%d ", payload_len
);
279 LEPRINTF("INVALID=LEN ");
283 struct iphdr
*h
= (struct iphdr
*)payload
;
285 if (payload_len
<= (u_int32_t
)(h
->ihl
* 4)) {
286 LEPRINTF("INVALID=IHL ");
290 char tmp
[INET_ADDRSTRLEN
];
292 inet_ntop(AF_INET
, &h
->saddr
, tmp
, sizeof(tmp
));
293 LEPRINTF("SRC=%s ", tmp
);
294 inet_ntop(AF_INET
, &h
->daddr
, tmp
, sizeof(tmp
));
295 LEPRINTF("DST=%s ", tmp
);
297 LEPRINTF("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
298 ntohs(h
->tot_len
), h
->tos
& IPTOS_TOS_MASK
,
299 h
->tos
& IPTOS_PREC_MASK
, h
->ttl
, ntohs(h
->id
));
301 short ip_off
= ntohs(h
->frag_off
);
302 if (ip_off
& IP_OFFMASK
)
303 LEPRINTF("FRAG=%u ", ip_off
& IP_OFFMASK
);
305 if (ip_off
& IP_DF
) LEPRINTF("DF ");
306 if (ip_off
& IP_MF
) LEPRINTF("MF ");
308 void *nexthdr
= (u_int32_t
*)h
+ h
->ihl
;
309 payload_len
-= h
->ihl
* 4;
311 switch (h
->protocol
) {
313 print_tcp(le
, (struct tcphdr
*)nexthdr
, payload_len
);
316 print_udp(le
, (struct udphdr
*)nexthdr
, payload_len
);
319 print_icmp(le
, (struct icmphdr
*)nexthdr
, payload_len
);
322 print_sctp(le
, (struct sctphdr
*)nexthdr
, payload_len
);
325 LEPRINTF("PROTO=AH ");
328 LEPRINTF("PROTO=ESP ");
331 LEPRINTF("PROTO=IGMP ");
334 LEPRINTF("PROTO=%u ", h
->protocol
);
341 print_ip6hdr(struct log_entry
*le
, char * payload
, int payload_len
)
343 LEPRINTF("IPV6 logging not implemented ");
348 // ebtables -I FORWARD --nflog --nflog-group 0
350 print_arp(struct log_entry
*le
, struct ether_arp
*h
, int payload_len
)
352 if (payload_len
< sizeof(struct ether_arp
)) {
353 LEPRINTF("LEN=%d ", payload_len
);
354 LEPRINTF("INVALID=LEN ");
358 LEPRINTF("SRC=%u.%u.%u.%u ", h
->arp_spa
[0], h
->arp_spa
[1],
359 h
->arp_spa
[2], h
->arp_spa
[3]);
361 LEPRINTF("DST=%u.%u.%u.%u ", h
->arp_tpa
[0], h
->arp_tpa
[1],
362 h
->arp_tpa
[2], h
->arp_tpa
[3]);
364 LEPRINTF("PROTO=ARP ");
366 unsigned short code
= ntohs(h
->arp_op
);
369 LEPRINTF("REQUEST ");
372 LEPRINTF("REPLY MAC=%02x:%02x:%02x:%02x:%02x:%02x ",
373 h
->arp_sha
[0], h
->arp_sha
[1], h
->arp_sha
[2],
374 h
->arp_sha
[3], h
->arp_sha
[4], h
->arp_sha
[5]);
380 LEPRINTF("CODE=%u ", code
);
384 // LEPRINTF("HTYPE=%u ", ntohs(h->arp_hrd));
386 // LEPRINTF("PTYPE=%u ", ntohs(h->arp_pro));
392 static int print_pkt(struct log_entry
*le
, struct nflog_data
*ldata
, u_int8_t family
)
394 u_int32_t mark
= nflog_get_nfmark(ldata
);
395 u_int32_t indev
= nflog_get_indev(ldata
);
396 u_int32_t outdev
= nflog_get_outdev(ldata
);
397 u_int32_t physindev
= nflog_get_physindev(ldata
);
398 u_int32_t physoutdev
= nflog_get_physoutdev(ldata
);
400 char *prefix
= nflog_get_prefix(ldata
);
405 nflog_get_timestamp(ldata
, &ts
);
407 LEPRINTTIME(ts
.tv_sec
);
409 //le->len += strftime(le->buf + le->len, LE_MAX - le->len, "%d/%b/%Y:%H:%M:%S %z ", localtime(&ts.tv_sec));
411 if (prefix
!= NULL
) {
412 LEPRINTF("%s", prefix
);
415 if ((indev
> 0) && (nlif_index2name(nlifh
, indev
, devname
) != -1)) {
416 LEPRINTF("IN=%s ", devname
);
419 if ((outdev
> 0) && (nlif_index2name(nlifh
, outdev
, devname
) != -1)) {
420 LEPRINTF("OUT=%s ", devname
);
423 if ((physindev
> 0) && (nlif_index2name(nlifh
, physindev
, devname
) != -1)) {
424 LEPRINTF("PHYSIN=%s ", devname
);
427 if ((physoutdev
> 0) && (nlif_index2name(nlifh
, physoutdev
, devname
) != -1)) {
428 LEPRINTF("PHYSOUT=%s ", devname
);
431 int payload_len
= nflog_get_payload(ldata
, &payload
);
433 int hwhdrlen
= nflog_get_msg_packet_hwhdrlen(ldata
);
435 unsigned char *hwhdr
= (unsigned char *)nflog_get_msg_packet_hwhdr(ldata
);
439 for (i
= 0; i
< hwhdrlen
; i
++) {
440 LEPRINTF("%02x", hwhdr
[i
]);
441 if (i
< (hwhdrlen
-1 )) LEPRINTF(":");
447 u_int16_t hw_protocol
= 0;
448 struct nfulnl_msg_packet_hdr
*ph
= NULL
;
452 print_iphdr(le
, payload
, payload_len
);
455 print_ip6hdr(le
, payload
, payload_len
);
458 ph
= nflog_get_msg_packet_hdr(ldata
);
459 if (ph
) hw_protocol
= ntohs(ph
->hw_protocol
);
461 switch (hw_protocol
) {
463 print_iphdr(le
, payload
, payload_len
);
466 print_ip6hdr(le
, payload
, payload_len
);
469 print_arp(le
, (struct ether_arp
*)payload
, payload_len
);
475 if (mark
) LEPRINTF("mark=%u ", mark
);
483 nflog_cb(struct nflog_g_handle
*gh
, struct nfgenmsg
*nfmsg
,
484 struct nflog_data
*nfa
, void *data
)
486 struct log_entry
*le
= g_new0(struct log_entry
, 1);
488 print_pkt(le
, nfa
, nfmsg
->nfgen_family
);
490 LEPRINTF("\n"); // add newline
498 nflog_read_cb(GIOChannel
*source
,
499 GIOCondition condition
,
505 int fd
= g_io_channel_unix_get_fd(source
);
507 if ((rv
= recv(fd
, buf
, sizeof(buf
), 0)) && rv
>= 0) {
508 nflog_handle_packet(logh
, buf
, rv
);
515 nlif_read_cb(GIOChannel
*source
,
516 GIOCondition condition
,
520 // fixme: report errors
524 GMainLoop
*main_loop
;
527 terminate_request(gpointer data
)
529 terminate_threads
= TRUE
;
531 log_status_message("received terminate request (signal)");
533 g_main_loop_quit(main_loop
);
540 main(int argc
, char *argv
[])
543 gboolean foreground
= FALSE
;
544 gboolean wrote_pidfile
= FALSE
;
548 if ((lockfd
= open(LOCKFILE
, O_RDWR
|O_CREAT
|O_APPEND
, 0644)) == -1) {
549 fprintf(stderr
, "unable to create lock '%s': %s", LOCKFILE
, strerror (errno
));
553 for (int i
= 10; i
>= 0; i
--) {
554 if (flock(lockfd
, LOCK_EX
|LOCK_NB
) != 0) {
556 fprintf(stderr
, "unable to aquire lock '%s': %s", LOCKFILE
, strerror (errno
));
560 fprintf(stderr
, "unable to aquire lock '%s' - trying again.\n", LOCKFILE
);
566 if ((outfd
= open(LOGFILE
, O_WRONLY
|O_CREAT
|O_APPEND
, 0644)) == -1) {
567 fprintf(stderr
, "unable to open file '%s': %s", LOGFILE
, strerror (errno
));
571 if ((logh
= nflog_open()) == NULL
) {
572 fprintf(stderr
, "unable to open nflog\n");
576 if (!nflog_bind_pf(logh
, AF_INET
) <= 0) {
577 fprintf(stderr
, "nflog_bind_pf AF_INET failed\n");
582 if (!nflog_bind_pf(logh
, AF_INET6
) <= 0) {
583 fprintf(stderr
, "nflog_bind_pf AF_INET6 failed\n");
588 if (!nflog_bind_pf(logh
, AF_BRIDGE
) <= 0) {
589 fprintf(stderr
, "nflog_bind_pf AF_BRIDGE failed\n");
593 struct nflog_g_handle
*qh
= nflog_bind_group(logh
, 0);
595 fprintf(stderr
, "no handle for group 1\n");
599 if (nflog_set_mode(qh
, NFULNL_COPY_PACKET
, 0xffff) < 0) {
600 fprintf(stderr
, "can't set packet copy mode\n");
604 if ((nlifh
= nlif_open()) == NULL
) {
605 fprintf(stderr
, "unable to open netlink interface handle\n");
613 fprintf(stderr
, "failed to daemonize program - %s\n", strerror (errno
));
621 if (chroot("/") != 0) fprintf(stderr
, "chroot '/' failed - %s\n", strerror (errno
));
623 if ((nullfd
= open("/dev/null", O_RDWR
, 0)) != -1) {
634 write_pidfile(getpid());
637 wrote_pidfile
= TRUE
;
639 nflog_callback_register(qh
, &nflog_cb
, logh
);
641 queue
= g_async_queue_new_full(g_free
);
643 log_status_message("starting pvefw logger");
647 GIOChannel
*nlif_ch
= g_io_channel_unix_new(nlif_fd(nlifh
));
649 g_io_add_watch(nlif_ch
, G_IO_IN
, nlif_read_cb
, NULL
);
651 int logfd
= nflog_fd(logh
);
652 GIOChannel
*nflog_ch
= g_io_channel_unix_new(logfd
);
654 g_io_add_watch(nflog_ch
, G_IO_IN
, nflog_read_cb
, NULL
);
656 GThread
*wthread
= g_thread_new("log_writer_thread", log_writer_thread
, NULL
);
658 main_loop
= g_main_loop_new(NULL
, TRUE
);
660 g_unix_signal_add(SIGINT
, terminate_request
, NULL
);
661 g_unix_signal_add(SIGTERM
, terminate_request
, NULL
);
663 g_main_loop_run(main_loop
);
665 log_status_message("stopping pvefw logger");
667 g_thread_join(wthread
);