src/pvefw-logger.c

   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/signalfd.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <unistd.h>
  37 #include <arpa/inet.h>
  38 #include <sys/socket.h>
  39 #include <sys/file.h>
  40 #include <linux/netlink.h>
  41 #include <libnfnetlink/libnfnetlink.h>
  42 #include <libnetfilter_log/libnetfilter_log.h>
  43 #include <netinet/ip.h>
  44 #include <netinet/ip_icmp.h>
  45 #include <netinet/udp.h>
  46 #include <netinet/tcp.h>
  47 #include <netinet/if_ether.h>
  48 #include <syslog.h>
  49
  50 #include <glib.h>
  51
  52 static struct nflog_handle *logh = NULL;
  53 static struct nlif_handle *nlifh = NULL;
  54 GMainLoop *main_loop;
  55
  56 gboolean foreground = FALSE;
  57 gboolean debug = FALSE;
  58
  59 /*
  60
  61 LOG FORMAT:
  62
  63 Special care was taken to allow fast parsing (and filer messages for a singl VM).
  64
  65 <VMID> <LOGLEVEL> <CHAIN> <TIME> <TIMEZONE> <MSG>
  66
  67 Example:
  68
  69 117 6 tap117i0-IN 14/Mar/2014:12:47:07 +0100 policy REJECT: IN=vmbr1 ...
  70
  71 */
  72
  73 #define LOGFILE "/var/log/pve-firewall.log"
  74
  75 #define LOCKFILE "/var/lock/pvefw-logger.lck"
  76 #define PIDFILE "/var/run/pvefw-logger.pid"
  77
  78 #define LQ_LEN 512
  79 #define LE_MAX (512 - 4) // try to fit into 512 bytes
  80
  81 #define MAX_CHAIN_LEN 28
  82
  83 struct log_entry {
  84     guint32 len; // max LE_MAX chars
  85     char buf[LE_MAX];
  86 };
  87
  88 #define STATIC_ASSERT(cond) \
  89     extern void pve_static_assert(int test[(cond) ? 1 : -1])
  90
  91 STATIC_ASSERT(sizeof(struct log_entry) == 512);
  92
  93 int outfd = -1;
  94
  95 gboolean terminate_threads = FALSE;
  96
  97 static gboolean write_pidfile(pid_t pid)
  98 {
  99     gboolean res;
 100
 101     char *strpid = g_strdup_printf("%d\n", pid);
 102     res = g_file_set_contents(PIDFILE, strpid, strlen(strpid), NULL);
 103     g_free(strpid);
 104
 105     return res;
 106 }
 107
 108 static GAsyncQueue *queue;
 109
 110 ssize_t
 111 safe_write(int fd, char *buf, size_t count)
 112 {
 113   ssize_t n;
 114
 115   do {
 116     n = write(fd, buf, count);
 117   } while (n < 0 && errno == EINTR);
 118
 119   return n;
 120 }
 121
 122 static gpointer
 123 log_writer_thread(gpointer data)
 124 {
 125     while (1) {
 126         struct log_entry *le = (struct log_entry *)g_async_queue_timeout_pop(queue, 250000);
 127         if (le == NULL) {
 128             if (terminate_threads) {
 129                 return NULL;
 130             }
 131             continue;
 132         }
 133
 134         if (debug) fputs(le->buf, stdout);
 135
 136         int res = safe_write(outfd, le->buf, le->len);
 137
 138         g_free(le);
 139
 140         if (res < 0) {
 141             syslog(3, "writing log failed, stopping daemon - %s", strerror (errno));
 142             g_main_loop_quit(main_loop);
 143             return NULL;
 144         }
 145     }
 146
 147     return NULL;
 148 }
 149
 150 static int skipped_logs = 0;
 151
 152 static void log_status_message(guint loglevel, const char *fmt, ...);
 153
 154 static void
 155 queue_log_entry(struct log_entry *le)
 156 {
 157     gint len = g_async_queue_length(queue);
 158
 159     if (skipped_logs > 0) {
 160         if (len >= (LQ_LEN - 1)) {
 161             skipped_logs++;
 162         } else {
 163             int skip_tmp = skipped_logs;
 164             skipped_logs = 0; // clear before calling log_status_message()
 165             log_status_message(3, "skipped %d log entries (queue full)", skip_tmp);
 166             g_async_queue_push(queue, le);
 167         }
 168     } else {
 169         if (len >= LQ_LEN) {
 170             skipped_logs++;
 171         } else {
 172             g_async_queue_push(queue, le);
 173         }
 174     }
 175 }
 176
 177
 178 #define LEPRINTF(format, ...) { if (le->len < LE_MAX) le->len += snprintf(le->buf + le->len, LE_MAX - le->len, format, ##__VA_ARGS__); }
 179 #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)); }
 180
 181 static void
 182 log_status_message(guint loglevel, const char *fmt, ...)
 183 {
 184     va_list ap;
 185     va_start(ap, fmt);
 186
 187     if (loglevel > 7 ) loglevel = 7; // syslog defines level 0-7
 188
 189     struct log_entry *le = g_new0(struct log_entry, 1);
 190
 191     LEPRINTF("0 %d - ", loglevel);
 192
 193     LEPRINTTIME(time(NULL));
 194
 195     le->len += vsnprintf(le->buf + le->len, LE_MAX - le->len, fmt, ap);
 196
 197     LEPRINTF("\n");
 198
 199     queue_log_entry(le);
 200
 201     // also log to syslog
 202
 203     vsyslog(loglevel, fmt, ap);
 204 }
 205
 206 static int
 207 print_tcp(struct log_entry *le, struct tcphdr *h, int payload_len)
 208 {
 209     LEPRINTF("PROTO=TCP ");
 210
 211     if (payload_len < sizeof(struct tcphdr)) {
 212         LEPRINTF("LEN=%d ", payload_len);
 213         LEPRINTF("INVALID=LEN ");
 214         return -1;
 215     }
 216
 217     LEPRINTF("SPT=%u DPT=%u ", ntohs(h->source), ntohs(h->dest));
 218     LEPRINTF("SEQ=%u ACK=%u ", ntohl(h->seq), ntohl(h->ack_seq));
 219     LEPRINTF("WINDOW=%u ", ntohs(h->window));
 220
 221     if (h->urg) LEPRINTF("URG ");
 222     if (h->ack) LEPRINTF("ACK ");
 223     if (h->psh) LEPRINTF("PSH ");
 224     if (h->rst) LEPRINTF("RST ");
 225     if (h->syn) LEPRINTF("SYN ");
 226     if (h->fin) LEPRINTF("FIN ");
 227
 228     if (h->urg) LEPRINTF("URGP=%u ",ntohs(h->urg_ptr));
 229
 230     return 0;
 231 }
 232
 233 static int
 234 print_udp(struct log_entry *le, struct udphdr *h, int payload_len)
 235 {
 236     LEPRINTF("PROTO=UDP ");
 237
 238     if (payload_len < sizeof(struct udphdr)) {
 239         LEPRINTF("LEN=%d ", payload_len);
 240         LEPRINTF("INVALID=LEN ");
 241         return -1;
 242     }
 243
 244     LEPRINTF("SPT=%u DPT=%u LEN=%u", ntohs(h->source), ntohs(h->dest), ntohs(h->len));
 245
 246     return 0;
 247 }
 248
 249 static int
 250 print_icmp(struct log_entry *le, struct icmphdr *h, int payload_len)
 251 {
 252     char tmp[INET_ADDRSTRLEN];
 253     u_int32_t gateway;
 254
 255     LEPRINTF("PROTO=ICMP ");
 256
 257     if (payload_len < sizeof(struct icmphdr)) {
 258         LEPRINTF("LEN=%d ", payload_len);
 259         LEPRINTF("INVALID=LEN ");
 260         return -1;
 261     }
 262
 263     LEPRINTF("TYPE=%u CODE=%u ", h->type, h->code);
 264
 265     switch (h->type) {
 266     case ICMP_ECHO:
 267     case ICMP_ECHOREPLY:
 268         LEPRINTF("ID=%u SEQ=%u ", ntohs(h->un.echo.id), ntohs(h->un.echo.sequence));
 269         break;
 270     case ICMP_PARAMETERPROB:
 271         LEPRINTF("PARAMETER=%u ", ntohl(h->un.gateway) >> 24);
 272         break;
 273     case ICMP_REDIRECT:
 274         gateway = ntohl(h->un.gateway);
 275         inet_ntop(AF_INET, &gateway, tmp, sizeof(tmp));
 276         LEPRINTF("GATEWAY=%s ", tmp);
 277         break;
 278     case ICMP_DEST_UNREACH:
 279         if (h->code == ICMP_FRAG_NEEDED) {
 280             LEPRINTF("MTU=%u ", ntohs(h->un.frag.mtu));
 281         }
 282         break;
 283     }
 284
 285     return 0;
 286 }
 287
 288 /* Section 3.1.  SCTP Common Header Format */
 289 typedef struct sctphdr {
 290         __be16 source;
 291         __be16 dest;
 292         __be32 vtag;
 293         __be32 checksum;
 294 } __attribute__((packed)) sctp_sctphdr_t;
 295
 296 static int
 297 print_sctp(struct log_entry *le, struct sctphdr *h, int payload_len)
 298 {
 299     LEPRINTF("PROTO=SCTP ");
 300
 301     if (payload_len < sizeof(struct sctphdr)) {
 302         LEPRINTF("LEN=%d ", payload_len);
 303         LEPRINTF("INVALID=LEN ");
 304         return -1;
 305     }
 306
 307     LEPRINTF("SPT=%u DPT=%u ", ntohs(h->source), ntohs(h->dest));
 308
 309     return 0;
 310 }
 311
 312 static int
 313 print_iphdr(struct log_entry *le, char * payload, int payload_len)
 314 {
 315     if (payload_len < sizeof(struct iphdr)) {
 316        LEPRINTF("LEN=%d ", payload_len);
 317        LEPRINTF("INVALID=LEN ");
 318        return -1;
 319     }
 320
 321     struct iphdr *h = (struct iphdr *)payload;
 322
 323     if (payload_len <= (u_int32_t)(h->ihl * 4)) {
 324         LEPRINTF("INVALID=IHL ");
 325         return -1;
 326     }
 327
 328     char tmp[INET_ADDRSTRLEN];
 329
 330     inet_ntop(AF_INET, &h->saddr, tmp, sizeof(tmp));
 331     LEPRINTF("SRC=%s ", tmp);
 332     inet_ntop(AF_INET, &h->daddr, tmp, sizeof(tmp));
 333     LEPRINTF("DST=%s ", tmp);
 334
 335     LEPRINTF("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
 336              ntohs(h->tot_len),  h->tos & IPTOS_TOS_MASK,
 337              h->tos & IPTOS_PREC_MASK, h->ttl, ntohs(h->id));
 338
 339     short ip_off = ntohs(h->frag_off);
 340     if (ip_off & IP_OFFMASK)
 341         LEPRINTF("FRAG=%u ", ip_off & IP_OFFMASK);
 342
 343     if (ip_off & IP_DF) LEPRINTF("DF ");
 344     if (ip_off & IP_MF) LEPRINTF("MF ");
 345
 346     void *nexthdr = (u_int32_t *)h + h->ihl;
 347     payload_len -= h->ihl * 4;
 348
 349     switch (h->protocol) {
 350     case IPPROTO_TCP:
 351         print_tcp(le, (struct tcphdr *)nexthdr, payload_len);
 352         break;
 353     case IPPROTO_UDP:
 354         print_udp(le, (struct udphdr *)nexthdr, payload_len);
 355         break;
 356     case IPPROTO_ICMP:
 357         print_icmp(le, (struct icmphdr *)nexthdr, payload_len);
 358         break;
 359     case IPPROTO_SCTP:
 360         print_sctp(le, (struct sctphdr *)nexthdr, payload_len);
 361         break;
 362     case IPPROTO_AH:
 363         LEPRINTF("PROTO=AH ");
 364         break;
 365     case IPPROTO_ESP:
 366         LEPRINTF("PROTO=ESP ");
 367         break;
 368     case IPPROTO_IGMP:
 369         LEPRINTF("PROTO=IGMP ");
 370         break;
 371      default:
 372         LEPRINTF("PROTO=%u ", h->protocol);
 373     }
 374
 375     return 0;
 376 }
 377
 378 static int
 379 print_ip6hdr(struct log_entry *le, char * payload, int payload_len)
 380 {
 381     LEPRINTF("IPV6 logging not implemented ");
 382
 383     return 0;
 384 }
 385
 386 // ebtables -I FORWARD --nflog --nflog-group 0
 387 static int
 388 print_arp(struct log_entry *le, struct ether_arp *h, int payload_len)
 389 {
 390     if (payload_len < sizeof(struct ether_arp)) {
 391         LEPRINTF("LEN=%d ", payload_len);
 392         LEPRINTF("INVALID=LEN ");
 393         return -1;
 394     }
 395
 396     LEPRINTF("SRC=%u.%u.%u.%u ", h->arp_spa[0], h->arp_spa[1],
 397              h->arp_spa[2], h->arp_spa[3]);
 398
 399     LEPRINTF("DST=%u.%u.%u.%u ", h->arp_tpa[0], h->arp_tpa[1],
 400              h->arp_tpa[2], h->arp_tpa[3]);
 401
 402     LEPRINTF("PROTO=ARP ");
 403
 404     unsigned short code = ntohs(h->arp_op);
 405     switch (code) {
 406     case ARPOP_REQUEST:
 407         LEPRINTF("REQUEST ");
 408         break;
 409     case ARPOP_REPLY:
 410         LEPRINTF("REPLY MAC=%02x:%02x:%02x:%02x:%02x:%02x ",
 411                  h->arp_sha[0], h->arp_sha[1], h->arp_sha[2],
 412                  h->arp_sha[3], h->arp_sha[4], h->arp_sha[5]);
 413         break;
 414     case ARPOP_NAK:
 415         LEPRINTF("NAK ");
 416         break;
 417     default:
 418         LEPRINTF("CODE=%u ", code);
 419     }
 420
 421
 422     // LEPRINTF("HTYPE=%u ", ntohs(h->arp_hrd));
 423
 424     // LEPRINTF("PTYPE=%u ", ntohs(h->arp_pro));
 425
 426     return 0;
 427 }
 428
 429
 430 static int print_pkt(struct log_entry *le, struct nflog_data *ldata, u_int8_t family)
 431 {
 432     u_int32_t mark = nflog_get_nfmark(ldata);
 433     u_int32_t indev = nflog_get_indev(ldata);
 434     u_int32_t outdev = nflog_get_outdev(ldata);
 435     u_int32_t physindev = nflog_get_physindev(ldata);
 436     u_int32_t physoutdev = nflog_get_physoutdev(ldata);
 437
 438     char *prefix = nflog_get_prefix(ldata);
 439     char *payload;
 440     char devname[256];
 441
 442     guint32 vmid = 0;
 443
 444     guint8 log_level = 6; // info
 445
 446     char *chain_name = "-";
 447
 448     if (prefix != NULL) {
 449         // Note: parse ":$vmid:$loglevel:$chain: $msg"
 450         if (prefix[0] == ':') {
 451             char *p = prefix + 1;
 452             guint32 tmpid = 0;
 453             while(*p  >= '0' && *p <= '9') { tmpid *= 10; tmpid += *p - '0'; p++; }
 454
 455             if ((*p == ':') &&
 456                 (p[1] >= '0' && p[1] <= '7') &&
 457                 (p[2] == ':')) {
 458
 459                 guint8 tmp_level = p[1] - '0'; // store for later use
 460                 char *chain_start = p + 3; // store for later use
 461                 p = chain_start;
 462                 while (*p && *p != ':' && *p != ' ') p++;
 463                 int len = p - chain_start;
 464
 465                 if (*p == ':' && p[1] == ' ' && len && (len <= MAX_CHAIN_LEN)) {
 466                     // parsing successful
 467
 468                     *p = 0; // terminate string
 469
 470                     vmid = tmpid;
 471                     log_level = tmp_level;
 472                     chain_name = chain_start;
 473                     prefix = p + 2; // the rest
 474                 }
 475             }
 476         }
 477     }
 478
 479     LEPRINTF("%d ", vmid);
 480
 481     LEPRINTF("%d ", log_level);
 482
 483     LEPRINTF("%s ", chain_name);
 484
 485     struct timeval ts;
 486     nflog_get_timestamp(ldata, &ts);
 487
 488     LEPRINTTIME(ts.tv_sec);
 489
 490     if (prefix != NULL) {
 491         LEPRINTF("%s", prefix);
 492     }
 493
 494     if (indev > 0) {
 495         if (nlif_index2name(nlifh, indev, devname) != -1) {
 496             LEPRINTF("IN=%s ", devname);
 497         } else {
 498             LEPRINTF("IN=%u ", indev);
 499         }
 500     }
 501
 502     if (outdev > 0) {
 503         if (nlif_index2name(nlifh, outdev, devname) != -1) {
 504             LEPRINTF("OUT=%s ", devname);
 505         } else {
 506             LEPRINTF("OUT=%u ", outdev);
 507         }
 508     }
 509
 510     if (physindev > 0) {
 511         if (nlif_index2name(nlifh, physindev, devname) != -1) {
 512             LEPRINTF("PHYSIN=%s ", devname);
 513         } else {
 514             LEPRINTF("PHYSIN=%u ", physindev);
 515         }
 516     }
 517
 518     if (physoutdev > 0) {
 519         if (nlif_index2name(nlifh, physoutdev, devname) != -1) {
 520             LEPRINTF("PHYSOUT=%s ", devname);
 521         } else {
 522             LEPRINTF("PHYSOUT=%u ", physoutdev);
 523         }
 524     }
 525
 526     int payload_len = nflog_get_payload(ldata, &payload);
 527
 528     int hwhdrlen = nflog_get_msg_packet_hwhdrlen(ldata);
 529     if (hwhdrlen > 0) {
 530         unsigned char *hwhdr = (unsigned char *)nflog_get_msg_packet_hwhdr(ldata);
 531         if (hwhdr != NULL) {
 532             int i;
 533             LEPRINTF("MAC=");
 534             for (i = 0; i < hwhdrlen; i++) {
 535                 LEPRINTF("%02x", hwhdr[i]);
 536                 if (i < (hwhdrlen -1 )) LEPRINTF(":");
 537             }
 538             LEPRINTF(" ");
 539         }
 540     }
 541
 542     u_int16_t hw_protocol = 0;
 543     struct nfulnl_msg_packet_hdr *ph = NULL;
 544
 545     switch (family) {
 546     case AF_INET:
 547         print_iphdr(le, payload, payload_len);
 548         break;
 549     case AF_INET6:
 550         print_ip6hdr(le, payload, payload_len);
 551         break;
 552     case AF_BRIDGE:
 553         ph = nflog_get_msg_packet_hdr(ldata);
 554         if (ph) hw_protocol = ntohs(ph->hw_protocol);
 555
 556         switch (hw_protocol) {
 557         case ETH_P_IP:
 558             print_iphdr(le, payload, payload_len);
 559             break;
 560         case ETH_P_IPV6:
 561              print_ip6hdr(le, payload, payload_len);
 562             break;
 563         case ETH_P_ARP:
 564             print_arp(le, (struct ether_arp *)payload, payload_len);
 565             break;
 566         }
 567         break;
 568     }
 569
 570     if (mark) LEPRINTF("mark=%u ", mark);
 571
 572
 573     return 0;
 574
 575 }
 576
 577 static int
 578 nflog_cb(struct nflog_g_handle *gh, struct nfgenmsg *nfmsg,
 579                struct nflog_data *nfa, void *data)
 580 {
 581     struct log_entry *le = g_new0(struct log_entry, 1);
 582
 583     print_pkt(le, nfa, nfmsg->nfgen_family);
 584
 585     LEPRINTF("\n"); // add newline
 586
 587     queue_log_entry(le);
 588
 589     return 0;
 590 }
 591
 592 static gboolean
 593 nflog_read_cb(GIOChannel *source,
 594               GIOCondition condition,
 595               gpointer data)
 596 {
 597     int rv = 0;
 598     gchar buf[8192];
 599
 600     int fd =  g_io_channel_unix_get_fd(source);
 601
 602     if ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) {
 603          nflog_handle_packet(logh, buf, rv);
 604     }
 605
 606     return TRUE;
 607 }
 608
 609 static gboolean
 610 nlif_read_cb(GIOChannel *source,
 611              GIOCondition condition,
 612              gpointer data)
 613 {
 614     static int last_res = 0;
 615     int res;
 616
 617     if ((res = nlif_catch(nlifh)) < 0) {
 618         if (last_res == 0) { // only report once
 619             log_status_message(3, "nlif_catch failed (res = %d)", res);
 620         }
 621         last_res = res;
 622     } else {
 623         last_res = 0;
 624     }
 625
 626     return TRUE;
 627 }
 628
 629 static gboolean
 630 signal_read_cb(GIOChannel *source,
 631                GIOCondition condition,
 632                gpointer data)
 633 {
 634     int rv = 0;
 635     struct signalfd_siginfo si;
 636
 637     int fd =  g_io_channel_unix_get_fd(source);
 638
 639     if ((rv = read(fd, &si, sizeof(si))) && rv >= 0) {
 640         terminate_threads = TRUE;
 641         log_status_message(5, "received terminate request (signal)");
 642         g_main_loop_quit(main_loop);
 643     }
 644
 645     return TRUE;
 646 }
 647
 648 int
 649 main(int argc, char *argv[])
 650 {
 651     int lockfd = -1;
 652     int sigfd = -1;
 653
 654     gboolean wrote_pidfile = FALSE;
 655
 656     openlog("pvepw-logger", LOG_CONS|LOG_PID, LOG_DAEMON);
 657
 658     GOptionContext *context;
 659
 660     GOptionEntry entries[] = {
 661         { "debug", 'd', 0, G_OPTION_ARG_NONE, &debug, "Turn on debug messages", NULL },
 662         { "foreground", 'f', 0, G_OPTION_ARG_NONE, &foreground, "Do not daemonize server", NULL },
 663         { NULL },
 664     };
 665
 666     context = g_option_context_new("");
 667     g_option_context_add_main_entries (context, entries, NULL);
 668
 669     GError *err = NULL;
 670     if (!g_option_context_parse (context, &argc, &argv, &err)) {
 671         fprintf(stderr, "error: %s\n", err->message);
 672         fprintf(stderr, "%s", g_option_context_get_help(context, FALSE, NULL));
 673         g_error_free (err);
 674         exit(-1);
 675     }
 676
 677     if (optind < argc) {
 678         fprintf(stderr, "error: too many arguments\n");
 679         fprintf(stderr, "%s", g_option_context_get_help(context, FALSE, NULL));
 680         exit(-1);
 681     }
 682
 683     g_option_context_free(context);
 684
 685     if (debug) foreground = TRUE;
 686
 687     if ((lockfd = open(LOCKFILE, O_RDWR|O_CREAT|O_APPEND, 0644)) == -1) {
 688         fprintf(stderr, "unable to create lock '%s': %s\n", LOCKFILE, strerror (errno) );
 689         exit(-1);
 690     }
 691
 692     for (int i = 10; i >= 0; i--) {
 693         if (flock(lockfd, LOCK_EX|LOCK_NB) != 0) {
 694             if (!i) {
 695                 fprintf(stderr, "unable to aquire lock '%s': %s\n", LOCKFILE, strerror (errno));
 696                 exit(-1);
 697             }
 698             if (i == 10)
 699                 fprintf(stderr, "unable to aquire lock '%s' - trying again.\n", LOCKFILE);
 700
 701             sleep(1);
 702         }
 703     }
 704
 705     if ((outfd = open(LOGFILE, O_WRONLY|O_CREAT|O_APPEND, 0644)) == -1) {
 706         fprintf(stderr, "unable to open file '%s': %s\n", LOGFILE, strerror (errno));
 707         exit(-1);
 708     }
 709
 710     if ((logh = nflog_open())  == NULL) {
 711         fprintf(stderr, "unable to open nflog\n");
 712         exit(-1);
 713     }
 714
 715     if (!nflog_bind_pf(logh, AF_INET) <= 0) {
 716         fprintf(stderr, "nflog_bind_pf AF_INET failed\n");
 717         exit(-1);
 718     }
 719
 720 #if 0
 721     if (!nflog_bind_pf(logh, AF_INET6) <= 0) {
 722         fprintf(stderr, "nflog_bind_pf AF_INET6 failed\n");
 723         exit(-1);
 724     }
 725 #endif
 726
 727     if (!nflog_bind_pf(logh, AF_BRIDGE) <= 0) {
 728         fprintf(stderr, "nflog_bind_pf AF_BRIDGE failed\n");
 729         exit(-1);
 730     }
 731
 732     struct nflog_g_handle *qh = nflog_bind_group(logh, 0);
 733     if (!qh) {
 734         fprintf(stderr, "no nflog handle for group 0\n");
 735         exit(-1);
 736     }
 737
 738     if (nflog_set_mode(qh, NFULNL_COPY_PACKET, 0xffff) < 0) {
 739         fprintf(stderr, "can't set packet copy mode\n");
 740         exit(-1);
 741     }
 742
 743     if ((nlifh = nlif_open()) == NULL) {
 744         fprintf(stderr, "unable to open netlink interface handle\n");
 745         exit(-1);
 746     }
 747
 748     sigset_t mask;
 749     sigemptyset(&mask);
 750     sigaddset(&mask, SIGINT);
 751     sigaddset(&mask, SIGTERM);
 752
 753     sigprocmask(SIG_BLOCK, &mask, NULL);
 754
 755     if ((sigfd = signalfd(-1, &mask, SFD_NONBLOCK)) < 0) {
 756         fprintf(stderr, "unable to open signalfd: %s\n", strerror (errno));
 757         exit(-1);
 758     }
 759
 760     if (!foreground) {
 761         pid_t cpid = fork();
 762
 763         if (cpid == -1) {
 764             fprintf(stderr, "failed to daemonize program - %s\n", strerror (errno));
 765             exit(-1);
 766         } else if (cpid) {
 767             write_pidfile(cpid);
 768             _exit(0);
 769         } else {
 770             int nullfd;
 771
 772             if (chroot("/") != 0) fprintf(stderr, "chroot '/' failed - %s\n", strerror (errno));
 773
 774             if ((nullfd = open("/dev/null", O_RDWR, 0)) != -1) {
 775                 dup2(nullfd, 0);
 776                 dup2(nullfd, 1);
 777                 dup2(nullfd, 2);
 778                 if (nullfd > 2)
 779                     close (nullfd);
 780             }
 781
 782             setsid();
 783         }
 784     } else {
 785         write_pidfile(getpid());
 786     }
 787
 788     wrote_pidfile = TRUE;
 789
 790     nflog_callback_register(qh, &nflog_cb, logh);
 791
 792     queue = g_async_queue_new_full(g_free);
 793
 794     log_status_message(5, "starting pvefw logger");
 795
 796     nlif_query(nlifh);
 797
 798     GIOChannel *nlif_ch = g_io_channel_unix_new(nlif_fd(nlifh));
 799
 800     g_io_add_watch(nlif_ch, G_IO_IN, nlif_read_cb, NULL);
 801
 802     int logfd = nflog_fd(logh);
 803     GIOChannel *nflog_ch = g_io_channel_unix_new(logfd);
 804
 805     g_io_add_watch(nflog_ch, G_IO_IN, nflog_read_cb, NULL);
 806
 807     GIOChannel *sig_ch = g_io_channel_unix_new(sigfd);
 808     if (!g_io_add_watch(sig_ch, G_IO_IN, signal_read_cb, NULL)) {
 809         exit(-1);
 810     }
 811
 812     GThread *wthread = g_thread_new("log_writer_thread", log_writer_thread, NULL);
 813
 814     main_loop = g_main_loop_new(NULL, TRUE);
 815
 816     g_main_loop_run(main_loop);
 817
 818     log_status_message(5, "stopping pvefw logger");
 819
 820     g_thread_join(wthread);
 821
 822     close(outfd);
 823
 824     nflog_close(logh);
 825
 826     if (wrote_pidfile)
 827         unlink(PIDFILE);
 828
 829     exit(0);
 830 }