src/flowtop.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2011 Daniel Borkmann.
   5  * Copyright 2011 Emmanuel Roullit.
   6  * Subject to the GPL, version 2.
   7  *
   8  * A tiny tool to provide top-like netfilter connection tracking information.
   9  *
  10  *   The Dark Lord has Nine. But we have One, mightier than they: the White
  11  *   Rider. He has passed through the fire and the abyss, and they shall
  12  *   fear him. We will go where he leads.
  13  *
  14  *     -- The Lord of the Rings, Aragorn,
  15  *        Chapter 'The White Rider'.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <stdio.h>
  20 #include <stdint.h>
  21 #include <stdlib.h>
  22 #include <signal.h>
  23 #include <getopt.h>
  24 #include <pthread.h>
  25 #include <signal.h>
  26 #include <netdb.h>
  27 #include <ctype.h>
  28 #include <libnetfilter_conntrack/libnetfilter_conntrack.h>
  29 #include <libnetfilter_conntrack/libnetfilter_conntrack_tcp.h>
  30 #include <GeoIP.h>
  31 #include <GeoIPCity.h>
  32 #include <netinet/in.h>
  33 #include <curses.h>
  34 #include <dirent.h>
  35 #include <sys/stat.h>
  36 #include <urcu.h>
  37 #include <libgen.h>
  38
  39 #include "die.h"
  40 #include "xmalloc.h"
  41 #include "xio.h"
  42 #include "xutils.h"
  43 #include "built_in.h"
  44 #include "locking.h"
  45 #include "dissector_eth.h"
  46 #include "pkt_buff.h"
  47
  48 #define INCLUDE_UDP     (1 << 0)
  49 #define INCLUDE_TCP     (1 << 1)
  50
  51 #ifndef ATTR_TIMESTAMP_START
  52 # define ATTR_TIMESTAMP_START 63
  53 #endif
  54 #ifndef ATTR_TIMESTAMP_STOP
  55 # define ATTR_TIMESTAMP_STOP 64
  56 #endif
  57
  58 #define SCROLL_MAX 1000
  59
  60 struct flow_entry {
  61         uint32_t flow_id;
  62         int first;
  63         struct flow_entry *next;
  64         uint32_t use;
  65         uint32_t status;
  66         uint8_t  l3_proto;
  67         uint8_t  l4_proto;
  68         uint32_t ip4_src_addr;
  69         uint32_t ip4_dst_addr;
  70         uint32_t ip6_src_addr[4];
  71         uint32_t ip6_dst_addr[4];
  72         uint16_t port_src;
  73         uint16_t port_dst;
  74         uint8_t  tcp_state;
  75         uint8_t  tcp_flags;
  76         uint64_t counter_pkts;
  77         uint64_t counter_bytes;
  78         uint64_t timestamp_start;
  79         uint64_t timestamp_stop;
  80         char country_src[128];
  81         char city_src[128];
  82         char rev_dns_src[256];
  83         char country_dst[128];
  84         char city_dst[128];
  85         char rev_dns_dst[256];
  86         int procnum;
  87         int inode;
  88         char cmdline[256];
  89 };
  90
  91 struct flow_list {
  92         struct flow_entry *head;
  93         struct spinlock lock;
  94 };
  95
  96 volatile sig_atomic_t sigint = 0;
  97
  98 static int what = INCLUDE_TCP;
  99
 100 static int show_src = 0;
 101
 102 static struct flow_list flow_list;
 103
 104 static GeoIP *gi_country = NULL;
 105 static GeoIP *gi_city = NULL;
 106
 107 static char *path_city_db = NULL, *path_country_db = NULL;
 108
 109 static const char *short_options = "vhTULKs";
 110 static const struct option long_options[] = {
 111         {"tcp",         no_argument,            NULL, 'T'},
 112         {"udp",         no_argument,            NULL, 'U'},
 113         {"show-src",    no_argument,            NULL, 's'},
 114         {"city-db",     required_argument,      NULL, 'L'},
 115         {"country-db",  required_argument,      NULL, 'K'},
 116         {"version",     no_argument,            NULL, 'v'},
 117         {"help",        no_argument,            NULL, 'h'},
 118         {NULL, 0, NULL, 0}
 119 };
 120
 121 const char *const l3proto2str[AF_MAX] = {
 122         [AF_INET]                       = "ipv4",
 123         [AF_INET6]                      = "ipv6",
 124 };
 125
 126 const char *const proto2str[IPPROTO_MAX] = {
 127         [IPPROTO_TCP]                   = "tcp",
 128         [IPPROTO_UDP]                   = "udp",
 129         [IPPROTO_UDPLITE]               = "udplite",
 130         [IPPROTO_ICMP]                  = "icmp",
 131         [IPPROTO_ICMPV6]                = "icmpv6",
 132         [IPPROTO_SCTP]                  = "sctp",
 133         [IPPROTO_GRE]                   = "gre",
 134         [IPPROTO_DCCP]                  = "dccp",
 135         [IPPROTO_IGMP]                  = "igmp",
 136         [IPPROTO_IPIP]                  = "ipip",
 137         [IPPROTO_EGP]                   = "egp",
 138         [IPPROTO_PUP]                   = "pup",
 139         [IPPROTO_IDP]                   = "idp",
 140         [IPPROTO_RSVP]                  = "rsvp",
 141         [IPPROTO_IPV6]                  = "ip6tun",
 142         [IPPROTO_ESP]                   = "esp",
 143         [IPPROTO_AH]                    = "ah",
 144         [IPPROTO_PIM]                   = "pim",
 145         [IPPROTO_COMP]                  = "comp",
 146 };
 147
 148 const char *const state2str[TCP_CONNTRACK_MAX] = {
 149         [TCP_CONNTRACK_NONE]            = "NOSTATE",
 150         [TCP_CONNTRACK_SYN_SENT]        = "SYN_SENT",
 151         [TCP_CONNTRACK_SYN_RECV]        = "SYN_RECV",
 152         [TCP_CONNTRACK_ESTABLISHED]     = "ESTABLISHED",
 153         [TCP_CONNTRACK_FIN_WAIT]        = "FIN_WAIT",
 154         [TCP_CONNTRACK_CLOSE_WAIT]      = "CLOSE_WAIT",
 155         [TCP_CONNTRACK_LAST_ACK]        = "LAST_ACK",
 156         [TCP_CONNTRACK_TIME_WAIT]       = "TIME_WAIT",
 157         [TCP_CONNTRACK_CLOSE]           = "CLOSE",
 158         [TCP_CONNTRACK_SYN_SENT2]       = "SYN_SENT2",
 159 };
 160
 161 const uint8_t states[] = {
 162         TCP_CONNTRACK_SYN_SENT,
 163         TCP_CONNTRACK_SYN_RECV,
 164         TCP_CONNTRACK_ESTABLISHED,
 165         TCP_CONNTRACK_FIN_WAIT,
 166         TCP_CONNTRACK_CLOSE_WAIT,
 167         TCP_CONNTRACK_LAST_ACK,
 168         TCP_CONNTRACK_TIME_WAIT,
 169         TCP_CONNTRACK_CLOSE,
 170         TCP_CONNTRACK_SYN_SENT2,
 171         TCP_CONNTRACK_NONE,
 172 };
 173
 174 static void signal_handler(int number)
 175 {
 176         switch (number) {
 177         case SIGINT:
 178                 sigint = 1;
 179                 break;
 180         case SIGHUP:
 181         default:
 182                 break;
 183         }
 184 }
 185
 186 static void help(void)
 187 {
 188         printf("\n%s %s, top-like netfilter TCP/UDP flow tracking\n",
 189                PROGNAME_STRING, VERSION_STRING);
 190         puts("http://www.netsniff-ng.org\n\n"
 191              "Usage: flowtop [options]\n"
 192              "Options:\n"
 193              "  -T|--tcp               Show only TCP flows (default)\n"
 194              "  -U|--udp               Show only UDP flows\n"
 195              "  -s|--show-src          Also show source, not only dest\n"
 196              "  --city-db <path>       Specifiy path for geoip city database\n"
 197              "  --country-db <path>    Specifiy path for geoip country database\n"
 198              "  -v|--version           Print version\n"
 199              "  -h|--help              Print this help\n\n"
 200              "Examples:\n"
 201              "  flowtop\n"
 202              "  flowtop -s\n\n"
 203              "Note:\n"
 204              "  If netfilter is not running, you can activate it with i.e.:\n"
 205              "   iptables -A INPUT -p tcp -m state --state ESTABLISHED -j ACCEPT\n"
 206              "   iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT\n\n"
 207              "Please report bugs to <bugs@netsniff-ng.org>\n"
 208              "Copyright (C) 2011-2012 Daniel Borkmann <daniel@netsniff-ng.org>\n"
 209              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel@netsniff-ng.org>\n"
 210              "License: GNU GPL version 2.0\n"
 211              "This is free software: you are free to change and redistribute it.\n"
 212              "There is NO WARRANTY, to the extent permitted by law.\n");
 213         die();
 214 }
 215
 216 static void version(void)
 217 {
 218         printf("\n%s %s, top-like netfilter TCP/UDP flow tracking\n",
 219                PROGNAME_STRING, VERSION_STRING);
 220         puts("http://www.netsniff-ng.org\n\n"
 221              "Please report bugs to <bugs@netsniff-ng.org>\n"
 222              "Copyright (C) 2011-2012 Daniel Borkmann <daniel@netsniff-ng.org>\n"
 223              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel@netsniff-ng.org>\n"
 224              "License: GNU GPL version 2.0\n"
 225              "This is free software: you are free to change and redistribute it.\n"
 226              "There is NO WARRANTY, to the extent permitted by law.\n");
 227         die();
 228 }
 229
 230 static void screen_init(WINDOW **screen)
 231 {
 232         (*screen) = initscr();
 233         noecho();
 234         cbreak();
 235         keypad(stdscr, TRUE);
 236         nodelay(*screen, TRUE);
 237         refresh();
 238         wrefresh(*screen);
 239 }
 240
 241 static inline uint16_t get_port(uint16_t src, uint16_t dst)
 242 {
 243         char *tmp1, *tmp2;
 244
 245         src = ntohs(src);
 246         dst = ntohs(dst);
 247
 248         /* XXX: Is there a better way to determine? */
 249         if (src < dst && src < 1024) {
 250                 return src;
 251         } else if (dst < src && dst < 1024) {
 252                 return dst;
 253         } else {
 254                 tmp1 = lookup_port_tcp(src);
 255                 tmp2 = lookup_port_tcp(dst);
 256                 if (tmp1 && !tmp2) {
 257                         return src;
 258                 } else if (!tmp1 && tmp2) {
 259                         return dst;
 260                 } else {
 261                         if (src < dst)
 262                                 return src;
 263                         else
 264                                 return dst;
 265                 }
 266         }
 267 }
 268
 269 static void screen_update(WINDOW *screen, struct flow_list *fl, int skip_lines)
 270 {
 271         int i, line = 3;
 272         int maxy;
 273         struct flow_entry *n;
 274
 275         curs_set(0);
 276         maxy = getmaxy(screen);
 277
 278         start_color();
 279         init_pair(1, COLOR_RED, COLOR_BLACK);
 280         init_pair(2, COLOR_BLUE, COLOR_BLACK);
 281         init_pair(3, COLOR_YELLOW, COLOR_BLACK);
 282         init_pair(4, COLOR_GREEN, COLOR_BLACK);
 283
 284         clear();
 285
 286         rcu_read_lock();
 287
 288         mvwprintw(screen, 1, 2, "Kernel netfilter TCP/UDP flow statistics, [+%d]",
 289                   skip_lines);
 290
 291         if (rcu_dereference(fl->head) == NULL)
 292                 mvwprintw(screen, line, 2, "(No active sessions! Is netfilter running?)");
 293
 294         maxy -= 4;
 295         /* Yes, that's lame :-P */
 296         for (i = 0; i < sizeof(states); i++) {
 297                 n = rcu_dereference(fl->head);
 298
 299                 while (n && maxy > 0) {
 300                         char tmp[128];
 301
 302                         if (n->tcp_state != states[i] ||
 303                             (i != TCP_CONNTRACK_NONE &&
 304                              n->tcp_state == TCP_CONNTRACK_NONE) ||
 305                             /* Filter out DNS */
 306                             get_port(n->port_src, n->port_dst) == 53) {
 307                                 n = rcu_dereference(n->next);
 308                                 continue;
 309                         }
 310
 311                         if (skip_lines > 0) {
 312                                 n = rcu_dereference(n->next);
 313                                 skip_lines--;
 314                                 continue;
 315                         }
 316
 317                         snprintf(tmp, sizeof(tmp), "%u/%s", n->procnum,
 318                                  basename(n->cmdline));
 319                         tmp[sizeof(tmp) - 1] = 0;
 320
 321                         mvwprintw(screen, line, 2, "[");
 322                         attron(COLOR_PAIR(3));
 323                         printw("%s", n->procnum > 0 ? tmp : "bridged(?)");
 324                         attroff(COLOR_PAIR(3));
 325                         printw("]:%s:%s[", l3proto2str[n->l3_proto],
 326                                proto2str[n->l4_proto]);
 327                         attron(COLOR_PAIR(3));
 328                         printw("%s", state2str[n->tcp_state]);
 329                         attroff(COLOR_PAIR(3));
 330                         printw("]:");
 331                         attron(A_BOLD);
 332                         if (n->tcp_state != TCP_CONNTRACK_NONE) {
 333                                 printw("%s -> ", lookup_port_tcp(get_port(n->port_src,
 334                                                                           n->port_dst)));
 335                         } else {
 336                                 printw("%s -> ", lookup_port_udp(get_port(n->port_src,
 337                                                                           n->port_dst)));
 338                         }
 339                         attroff(A_BOLD);
 340                         if (show_src) {
 341                                 attron(COLOR_PAIR(1));
 342                                 mvwprintw(screen, ++line, 8, "src: %s", n->rev_dns_src);
 343                                 attroff(COLOR_PAIR(1));
 344                                 printw(":%u (", ntohs(n->port_src));
 345                                 attron(COLOR_PAIR(4));
 346                                 printw("%s", (strlen(n->country_src) > 0 ?
 347                                        n->country_src : "N/A"));
 348                                 attroff(COLOR_PAIR(4));
 349                                 printw(", %s) => ", (strlen(n->city_src) > 0 ?
 350                                        n->city_src : "N/A"));
 351                         }
 352                         attron(COLOR_PAIR(2));
 353                         mvwprintw(screen, ++line, 8, "dst: %s", n->rev_dns_dst);
 354                         attroff(COLOR_PAIR(2));
 355                         printw(":%u (", ntohs(n->port_dst));
 356                         attron(COLOR_PAIR(4));
 357                         printw("%s", strlen(n->country_dst) > 0 ?
 358                                n->country_dst : "N/A");
 359                         attroff(COLOR_PAIR(4));
 360                         printw(", %s)", strlen(n->city_dst) > 0 ?
 361                                n->city_dst : "N/A");
 362
 363                         line++;
 364                         maxy--;
 365                         n = rcu_dereference(n->next);
 366                 }
 367         }
 368
 369         rcu_read_unlock();
 370
 371         wrefresh(screen);
 372         refresh();
 373 }
 374
 375 static void screen_end(void)
 376 {
 377         endwin();
 378 }
 379
 380 static void presenter(void)
 381 {
 382         int skip_lines = 0;
 383         WINDOW *screen = NULL;
 384
 385         dissector_init_ethernet(0);
 386         screen_init(&screen);
 387         rcu_register_thread();
 388
 389         while (!sigint) {
 390                 switch (getch()) {
 391                 case 'q':
 392                         sigint = 1;
 393                         break;
 394                 case KEY_UP:
 395                 case 'u':
 396                 case 'k':
 397                         skip_lines--;
 398                         if (skip_lines < 0)
 399                                 skip_lines = 0;
 400                         break;
 401                 case KEY_DOWN:
 402                 case 'd':
 403                 case 'j':
 404                         skip_lines++;
 405                         if (skip_lines > SCROLL_MAX)
 406                                 skip_lines = SCROLL_MAX;
 407                         break;
 408                 default:
 409                         fflush(stdin);
 410                         break;
 411                 }
 412
 413                 screen_update(screen, &flow_list, skip_lines);
 414                 usleep(100000);
 415         }
 416
 417         rcu_unregister_thread();
 418         screen_end();
 419         dissector_cleanup_ethernet();
 420 }
 421
 422 static inline const char *make_n_a(const char *p)
 423 {
 424         return p ? : "N/A";
 425 }
 426
 427 static void walk_process(char *process, struct flow_entry *n)
 428 {
 429         int rc;
 430         DIR *dir;
 431         struct dirent *ent;
 432         char path[1024];
 433
 434         if (snprintf(path, sizeof(path), "/proc/%s/fd", process) == -1)
 435                 panic("giant process name! %s\n", process);
 436
 437         dir = opendir(path);
 438         if (!dir)
 439                 return;
 440
 441         while ((ent = readdir(dir))) {
 442                 struct stat statbuf;
 443
 444                 if (snprintf(path, sizeof(path), "/proc/%s/fd/%s",
 445                              process, ent->d_name) < 0)
 446                         continue;
 447                 if (stat(path, &statbuf) < 0)
 448                         continue;
 449                 if (S_ISSOCK(statbuf.st_mode) && n->inode == statbuf.st_ino) {
 450                         memset(n->cmdline, 0, sizeof(n->cmdline));
 451                         snprintf(path, sizeof(path), "/proc/%s/exe", process);
 452                         rc = readlink(path, n->cmdline, sizeof(n->cmdline) - 1);
 453
 454                         if (rc < 0)
 455                                 panic("readlink error: %s\n", strerror(errno));
 456
 457                         n->procnum = atoi(process);
 458                 }
 459         }
 460
 461         closedir(dir);
 462 }
 463
 464 /* Derived from ifpromisc, Fred N. van Kempen, GPL v2.0 */
 465 /* n->inode must be set */
 466 static void walk_processes(struct flow_entry *n)
 467 {
 468         DIR *dir;
 469         struct dirent *ent;
 470
 471         if (n->inode <= 0) {
 472                 memset(n->cmdline, 0, sizeof(n->cmdline));
 473                 return;
 474         }
 475
 476         dir = opendir("/proc");
 477         if (!dir)
 478                 panic("Cannot open /proc!\n");
 479
 480         while ((ent = readdir(dir)))
 481                 if (strspn(ent->d_name, "0123456789") == strlen(ent->d_name))
 482                         walk_process(ent->d_name, n);
 483
 484         closedir(dir);
 485 }
 486
 487 static int get_inode_from_local_port(int port, const char *proto, int ip6)
 488 {
 489         int ret = -ENOENT;
 490         char path[128];
 491         char buff[1024];
 492         FILE *proc;
 493
 494         memset(path, 0, sizeof(path));
 495         snprintf(path, sizeof(path), "/proc/net/%s%s", proto, ip6 ? "6" : "");
 496         proc = fopen(path, "r");
 497         if (!proc)
 498                 return -EIO;
 499         memset(buff, 0, sizeof(buff));
 500         while (fgets(buff, sizeof(buff), proc) != NULL) {
 501                 int lport = 0, inode = 0;
 502                 buff[sizeof(buff) - 1] = 0;
 503                 if (sscanf(buff, "%*u: %*X:%X %*X:%*X %*X %*X:%*X %*X:%*X "
 504                            "%*X %*u %*u %u", &lport, &inode) == 2) {
 505                         if (lport == port) {
 506                                 ret = inode;
 507                                 break;
 508                         }
 509                 }
 510                 memset(buff, 0, sizeof(buff));
 511         }
 512         fclose(proc);
 513
 514         return ret;
 515 }
 516
 517 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct)
 518 {
 519         const uint8_t *ipv6_src;
 520         const uint8_t *ipv6_dst;
 521
 522         n->flow_id = nfct_get_attr_u32(ct, ATTR_ID);
 523         n->use = nfct_get_attr_u32(ct, ATTR_USE);
 524         n->status = nfct_get_attr_u32(ct, ATTR_STATUS);
 525         n->l3_proto = nfct_get_attr_u8(ct, ATTR_ORIG_L3PROTO);
 526         n->l4_proto = nfct_get_attr_u8(ct, ATTR_ORIG_L4PROTO);
 527         n->ip4_src_addr = nfct_get_attr_u32(ct, ATTR_ORIG_IPV4_SRC);
 528         n->ip4_dst_addr = nfct_get_attr_u32(ct, ATTR_ORIG_IPV4_DST);
 529
 530         ipv6_src = nfct_get_attr(ct, ATTR_ORIG_IPV6_SRC);
 531         if (ipv6_src)
 532                 memcpy(n->ip6_src_addr, ipv6_src, sizeof(n->ip6_src_addr));
 533         ipv6_dst = nfct_get_attr(ct, ATTR_ORIG_IPV6_DST);
 534         if (ipv6_dst)
 535                 memcpy(n->ip6_dst_addr, ipv6_dst, sizeof(n->ip6_dst_addr));
 536
 537         n->port_src = nfct_get_attr_u16(ct, ATTR_ORIG_PORT_SRC);
 538         n->port_dst = nfct_get_attr_u16(ct, ATTR_ORIG_PORT_DST);
 539         n->tcp_state = nfct_get_attr_u8(ct, ATTR_TCP_STATE);
 540         n->tcp_flags = nfct_get_attr_u8(ct, ATTR_TCP_FLAGS_ORIG);
 541         n->counter_pkts = nfct_get_attr_u64(ct, ATTR_ORIG_COUNTER_PACKETS);
 542         n->counter_bytes = nfct_get_attr_u64(ct, ATTR_ORIG_COUNTER_BYTES);
 543         n->timestamp_start = nfct_get_attr_u64(ct, ATTR_TIMESTAMP_START);
 544         n->timestamp_stop = nfct_get_attr_u64(ct, ATTR_TIMESTAMP_STOP);
 545
 546         if (n->first) {
 547                 n->inode = get_inode_from_local_port(ntohs(n->port_src),
 548                                                      proto2str[n->l4_proto],
 549                                                      !!(ipv6_src));
 550                 if (n->inode > 0)
 551                         walk_processes(n);
 552         }
 553         /* if this really runs on a router, we try it once and then let it be */
 554         n->first = 0;
 555 }
 556
 557 /* TODO: IP4 + IP6 */
 558 static void flow_entry_get_extended(struct flow_entry *n)
 559 {
 560         struct sockaddr_in sa;
 561         struct hostent *hent;
 562         GeoIPRecord *gir_src, *gir_dst;
 563
 564         if (n->flow_id == 0)
 565                 return;
 566         if (ntohs(n->port_src) == 53 || ntohs(n->port_dst) == 53)
 567                 return;
 568
 569         memset(&sa, 0, sizeof(sa));
 570         sa.sin_family = PF_INET; //XXX: IPv4
 571         sa.sin_addr.s_addr = n->ip4_src_addr;
 572         getnameinfo((struct sockaddr *) &sa, sizeof(sa), n->rev_dns_src,
 573                     sizeof(n->rev_dns_src), NULL, 0, NI_NUMERICHOST);
 574
 575         hent = gethostbyaddr(&sa.sin_addr, sizeof(sa.sin_addr), PF_INET);
 576         if (hent) {
 577                 memset(n->rev_dns_src, 0, sizeof(n->rev_dns_src));
 578                 memcpy(n->rev_dns_src, hent->h_name,
 579                        min(sizeof(n->rev_dns_src), strlen(hent->h_name)));
 580         }
 581
 582         gir_src = GeoIP_record_by_ipnum(gi_city, ntohl(n->ip4_src_addr));
 583         if (gir_src) {
 584                 const char *country =
 585                         make_n_a(GeoIP_country_name_by_ipnum(gi_country,
 586                                                              ntohl(n->ip4_src_addr)));
 587                 const char *city = make_n_a(gir_src->city);
 588                 memcpy(n->country_src, country,
 589                        min(sizeof(n->country_src), strlen(country)));
 590                 memcpy(n->city_src, city,
 591                        min(sizeof(n->city_src), strlen(city)));
 592         }
 593
 594         memset(&sa, 0, sizeof(sa));
 595         sa.sin_family = PF_INET; //XXX: IPv4
 596         sa.sin_addr.s_addr = n->ip4_dst_addr;
 597         getnameinfo((struct sockaddr *) &sa, sizeof(sa), n->rev_dns_dst,
 598                     sizeof(n->rev_dns_dst), NULL, 0, NI_NUMERICHOST);
 599
 600         hent = gethostbyaddr(&sa.sin_addr, sizeof(sa.sin_addr), PF_INET);
 601         if (hent) {
 602                 memset(n->rev_dns_dst, 0, sizeof(n->rev_dns_dst));
 603                 memcpy(n->rev_dns_dst, hent->h_name,
 604                        min(sizeof(n->rev_dns_dst), strlen(hent->h_name)));
 605         }
 606
 607         gir_dst = GeoIP_record_by_ipnum(gi_city, ntohl(n->ip4_dst_addr));
 608         if (gir_dst) {
 609                 const char *country =
 610                         make_n_a(GeoIP_country_name_by_ipnum(gi_country,
 611                                                              ntohl(n->ip4_dst_addr)));
 612                 const char *city = make_n_a(gir_dst->city);
 613                 memcpy(n->country_dst, country,
 614                        min(sizeof(n->country_dst), strlen(country)));
 615                 memcpy(n->city_dst, city,
 616                        min(sizeof(n->city_dst), strlen(city)));
 617         }
 618 }
 619
 620 static void flow_list_init(struct flow_list *fl)
 621 {
 622         fl->head = NULL;
 623         spinlock_init(&fl->lock);
 624 }
 625
 626 static struct flow_entry *__flow_list_find_by_id(struct flow_list *fl, uint32_t id)
 627 {
 628         struct flow_entry *n = rcu_dereference(fl->head);
 629         while (n != NULL) {
 630                 if (n->flow_id == id)
 631                         return n;
 632                 n = rcu_dereference(n->next);
 633         }
 634         return NULL;
 635 }
 636
 637 static struct flow_entry *__flow_list_find_prev_by_id(struct flow_list *fl, uint32_t id)
 638 {
 639         struct flow_entry *n = rcu_dereference(fl->head);
 640         if (n->flow_id == id)
 641                 return NULL;
 642         while (rcu_dereference(n->next) != NULL) {
 643                 if (rcu_dereference(n->next)->flow_id == id)
 644                         return n;
 645                 n = rcu_dereference(n->next);
 646         }
 647         return NULL;
 648 }
 649
 650 static void flow_list_new_entry(struct flow_list *fl, struct nf_conntrack *ct)
 651 {
 652         struct flow_entry *n = xzmalloc(sizeof(*n));
 653         n->first = 1;
 654         rcu_assign_pointer(n->next, fl->head);
 655         rcu_assign_pointer(fl->head, n);
 656         flow_entry_from_ct(n, ct);
 657         flow_entry_get_extended(n);
 658 }
 659
 660 static void flow_list_update_entry(struct flow_list *fl, struct nf_conntrack *ct)
 661 {
 662         int do_ext = 0;
 663         uint32_t id = nfct_get_attr_u32(ct, ATTR_ID);
 664         struct flow_entry *n;
 665         n = __flow_list_find_by_id(fl, id);
 666         if (n == NULL) {
 667                 n = xzmalloc(sizeof(*n));
 668                 n->first = 1;
 669                 rcu_assign_pointer(n->next, fl->head);
 670                 rcu_assign_pointer(fl->head, n);
 671                 do_ext = 1;
 672         }
 673         flow_entry_from_ct(n, ct);
 674         if (do_ext)
 675                 flow_entry_get_extended(n);
 676 }
 677
 678 static void flow_list_destroy_entry(struct flow_list *fl, struct nf_conntrack *ct)
 679 {
 680         uint32_t id = nfct_get_attr_u32(ct, ATTR_ID);
 681         struct flow_entry *n1, *n2;
 682
 683         n1 = __flow_list_find_by_id(fl, id);
 684         if (n1) {
 685                 n2 = __flow_list_find_prev_by_id(fl, id);
 686                 if (n2) {
 687                         rcu_assign_pointer(n2->next, n1->next);
 688                         rcu_assign_pointer(n1->next, NULL);
 689                         xfree(n1);
 690                 } else {
 691                         xfree(fl->head);
 692                         rcu_assign_pointer(fl->head, NULL);
 693                 }
 694         }
 695 }
 696
 697 static void flow_list_destroy(struct flow_list *fl)
 698 {
 699         struct flow_entry *n;
 700
 701         while (fl->head != NULL) {
 702                 n = rcu_dereference(fl->head->next);
 703                 rcu_assign_pointer(fl->head->next, NULL);
 704                 xfree(fl->head);
 705                 rcu_assign_pointer(fl->head, n);
 706         }
 707
 708         synchronize_rcu();
 709         spinlock_destroy(&fl->lock);
 710 }
 711
 712 static int collector_cb(enum nf_conntrack_msg_type type,
 713                         struct nf_conntrack *ct,
 714                         void *data)
 715 {
 716         if (sigint)
 717                 return NFCT_CB_STOP;
 718
 719         synchronize_rcu();
 720
 721         spinlock_lock(&flow_list.lock);
 722         switch (type) {
 723         case NFCT_T_NEW:
 724                 flow_list_new_entry(&flow_list, ct);
 725                 break;
 726         case NFCT_T_UPDATE:
 727                 flow_list_update_entry(&flow_list, ct);
 728                 break;
 729         case NFCT_T_DESTROY:
 730                 flow_list_destroy_entry(&flow_list, ct);
 731                 break;
 732         default:
 733                 break;
 734         }
 735         spinlock_unlock(&flow_list.lock);
 736
 737         return NFCT_CB_CONTINUE;
 738 }
 739
 740 static int dummy_cb(enum nf_conntrack_msg_type type, struct nf_conntrack *ct,
 741                     void *data)
 742 {
 743         return NFCT_CB_STOP;
 744 }
 745
 746 static void *collector(void *null)
 747 {
 748         int ret;
 749         u_int32_t family = AF_INET;
 750         struct nfct_handle *handle;
 751         struct nfct_filter *filter;
 752         struct nfct_filter_ipv4 filter_ipv4 = {
 753                 .addr = ntohl(INADDR_LOOPBACK),
 754                 .mask = 0xffffffff,
 755         };
 756         struct nfct_filter_ipv6 filter_ipv6 = {
 757                 .addr = { 0x0, 0x0, 0x0, 0x1 },
 758                 .mask = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff },
 759         };
 760
 761         handle = nfct_open(CONNTRACK, NFCT_ALL_CT_GROUPS);
 762         if (!handle)
 763                 panic("Cannot create a nfct handle!\n");
 764
 765         /* Hack: inits ct */
 766         nfct_callback_register(handle, NFCT_T_ALL, dummy_cb, NULL);
 767         nfct_query(handle, NFCT_Q_DUMP, &family);
 768         nfct_close(handle);
 769
 770         handle = nfct_open(CONNTRACK, NFCT_ALL_CT_GROUPS);
 771         if (!handle)
 772                 panic("Cannot create a nfct handle!\n");
 773
 774         nfct_query(handle, NFCT_Q_FLUSH, &family);
 775
 776         filter = nfct_filter_create();
 777         if (!filter)
 778                 panic("Cannot create a nfct filter!\n");
 779         if (what & INCLUDE_UDP)
 780                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDP);
 781         if (what & INCLUDE_TCP)
 782                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_TCP);
 783
 784         nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV4,
 785                               NFCT_FILTER_LOGIC_NEGATIVE);
 786         nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV4, &filter_ipv4);
 787
 788         nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV6,
 789                               NFCT_FILTER_LOGIC_NEGATIVE);
 790         nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV6, &filter_ipv6);
 791
 792         ret = nfct_filter_attach(nfct_fd(handle), filter);
 793         if (ret < 0)
 794                 panic("Cannot attach filter to handle!\n");
 795
 796         nfct_filter_destroy(filter);
 797
 798         if (path_country_db)
 799                 gi_country = GeoIP_open(path_country_db, GEOIP_MMAP_CACHE);
 800         else
 801                 gi_country = GeoIP_open_type(GEOIP_COUNTRY_EDITION,
 802                                              GEOIP_MMAP_CACHE);
 803
 804         if (path_city_db)
 805                 gi_city = GeoIP_open(path_city_db, GEOIP_MMAP_CACHE);
 806         else
 807                 gi_city = GeoIP_open_type(GEOIP_CITY_EDITION_REV1,
 808                                           GEOIP_MMAP_CACHE);
 809         if (!gi_country || !gi_city)
 810                 panic("Cannot open GeoIP database!\n");
 811
 812         GeoIP_set_charset(gi_country, GEOIP_CHARSET_UTF8);
 813         GeoIP_set_charset(gi_city, GEOIP_CHARSET_UTF8);
 814
 815         flow_list_init(&flow_list);
 816
 817         rcu_register_thread();
 818
 819         nfct_callback_register(handle, NFCT_T_ALL, collector_cb, NULL);
 820
 821         while (!sigint)
 822                 nfct_catch(handle);
 823
 824         rcu_unregister_thread();
 825
 826         flow_list_destroy(&flow_list);
 827
 828         GeoIP_delete(gi_city);
 829         GeoIP_delete(gi_country);
 830
 831         nfct_close(handle);
 832
 833         if (path_city_db)
 834                 xfree(path_city_db);
 835         if (path_country_db)
 836                 xfree(path_country_db);
 837
 838         pthread_exit(0);
 839 }
 840
 841 int main(int argc, char **argv)
 842 {
 843         pthread_t tid;
 844         int ret, c, opt_index, what_cmd = 0;
 845
 846         while ((c = getopt_long(argc, argv, short_options, long_options,
 847                &opt_index)) != EOF) {
 848                 switch (c) {
 849                 case 'T':
 850                         what_cmd |= INCLUDE_TCP;
 851                         break;
 852                 case 'U':
 853                         what_cmd |= INCLUDE_UDP;
 854                         break;
 855                 case 's':
 856                         show_src = 1;
 857                         break;
 858                 case 'L':
 859                         path_city_db = xstrdup(optarg);
 860                         break;
 861                 case 'K':
 862                         path_country_db = xstrdup(optarg);
 863                         break;
 864                 case 'h':
 865                         help();
 866                         break;
 867                 case 'v':
 868                         version();
 869                         break;
 870                 case '?':
 871                         switch (optopt) {
 872                         case 'L':
 873                         case 'K':
 874                                 panic("Option -%c requires an argument!\n",
 875                                       optopt);
 876                         default:
 877                                 if (isprint(optopt))
 878                                         whine("Unknown option character "
 879                                               "`0x%X\'!\n", optopt);
 880                                 die();
 881                         }
 882                 default:
 883                         break;
 884                 }
 885         }
 886
 887         if (what_cmd > 0)
 888                 what = what_cmd;
 889
 890         rcu_init();
 891
 892         register_signal(SIGINT, signal_handler);
 893         register_signal(SIGHUP, signal_handler);
 894
 895         ret = pthread_create(&tid, NULL, collector, NULL);
 896         if (ret < 0)
 897                 panic("Cannot create phthread!\n");
 898
 899         presenter();
 900         return 0;
 901 }
 902