flowtop.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * Copyright 2011 - 2013 Daniel Borkmann.
   4  * Copyright 2011 Emmanuel Roullit.
   5  * Subject to the GPL, version 2.
   6  */
   7
   8 #define _LGPL_SOURCE
   9 #include <stdio.h>
  10 #include <stdint.h>
  11 #include <stdlib.h>
  12 #include <signal.h>
  13 #include <getopt.h>
  14 #include <pthread.h>
  15 #include <signal.h>
  16 #include <netdb.h>
  17 #include <ctype.h>
  18 #include <libnetfilter_conntrack/libnetfilter_conntrack.h>
  19 #include <libnetfilter_conntrack/libnetfilter_conntrack_tcp.h>
  20 #include <libnetfilter_conntrack/libnetfilter_conntrack_dccp.h>
  21 #include <libnetfilter_conntrack/libnetfilter_conntrack_sctp.h>
  22 #include <netinet/in.h>
  23 #include <curses.h>
  24 #include <dirent.h>
  25 #include <sys/stat.h>
  26 #include <sys/fsuid.h>
  27 #include <urcu.h>
  28 #include <libgen.h>
  29
  30 #include "die.h"
  31 #include "xmalloc.h"
  32 #include "ioops.h"
  33 #include "str.h"
  34 #include "sig.h"
  35 #include "geoip.h"
  36 #include "built_in.h"
  37 #include "locking.h"
  38 #include "dissector_eth.h"
  39 #include "pkt_buff.h"
  40
  41 struct flow_entry {
  42         uint32_t flow_id, use, status;
  43         uint8_t  l3_proto, l4_proto;
  44         uint32_t ip4_src_addr, ip4_dst_addr;
  45         uint32_t ip6_src_addr[4], ip6_dst_addr[4];
  46         uint16_t port_src, port_dst;
  47         uint8_t  tcp_state, tcp_flags, sctp_state, dccp_state;
  48         uint64_t counter_pkts, counter_bytes;
  49         uint64_t timestamp_start, timestamp_stop;
  50         char country_src[128], country_dst[128];
  51         char city_src[128], city_dst[128];
  52         char rev_dns_src[256], rev_dns_dst[256];
  53         char cmdline[256];
  54         struct flow_entry *next;
  55         int procnum, inode;
  56 };
  57
  58 struct flow_list {
  59         struct flow_entry *head;
  60         struct spinlock lock;
  61 };
  62
  63 #ifndef ATTR_TIMESTAMP_START
  64 # define ATTR_TIMESTAMP_START 63
  65 #endif
  66 #ifndef ATTR_TIMESTAMP_STOP
  67 # define ATTR_TIMESTAMP_STOP 64
  68 #endif
  69
  70 #define SCROLL_MAX 1000
  71
  72 #define INCLUDE_IPV4    (1 << 0)
  73 #define INCLUDE_IPV6    (1 << 1)
  74 #define INCLUDE_UDP     (1 << 2)
  75 #define INCLUDE_TCP     (1 << 3)
  76 #define INCLUDE_DCCP    (1 << 4)
  77 #define INCLUDE_ICMP    (1 << 5)
  78 #define INCLUDE_SCTP    (1 << 6)
  79
  80 static volatile sig_atomic_t sigint = 0;
  81 static int what = INCLUDE_IPV4 | INCLUDE_IPV6 | INCLUDE_TCP, show_src = 0;
  82 static struct flow_list flow_list;
  83
  84 static const char *short_options = "vhTUsDIS46u";
  85 static const struct option long_options[] = {
  86         {"ipv4",        no_argument,            NULL, '4'},
  87         {"ipv6",        no_argument,            NULL, '6'},
  88         {"tcp",         no_argument,            NULL, 'T'},
  89         {"udp",         no_argument,            NULL, 'U'},
  90         {"dccp",        no_argument,            NULL, 'D'},
  91         {"icmp",        no_argument,            NULL, 'I'},
  92         {"sctp",        no_argument,            NULL, 'S'},
  93         {"show-src",    no_argument,            NULL, 's'},
  94         {"update",      no_argument,            NULL, 'u'},
  95         {"version",     no_argument,            NULL, 'v'},
  96         {"help",        no_argument,            NULL, 'h'},
  97         {NULL, 0, NULL, 0}
  98 };
  99
 100 static const char *const l3proto2str[AF_MAX] = {
 101         [AF_INET]                       = "ipv4",
 102         [AF_INET6]                      = "ipv6",
 103 };
 104
 105 static const char *const l4proto2str[IPPROTO_MAX] = {
 106         [IPPROTO_TCP]                   = "tcp",
 107         [IPPROTO_UDP]                   = "udp",
 108         [IPPROTO_UDPLITE]               = "udplite",
 109         [IPPROTO_ICMP]                  = "icmp",
 110         [IPPROTO_ICMPV6]                = "icmpv6",
 111         [IPPROTO_SCTP]                  = "sctp",
 112         [IPPROTO_GRE]                   = "gre",
 113         [IPPROTO_DCCP]                  = "dccp",
 114         [IPPROTO_IGMP]                  = "igmp",
 115         [IPPROTO_IPIP]                  = "ipip",
 116         [IPPROTO_EGP]                   = "egp",
 117         [IPPROTO_PUP]                   = "pup",
 118         [IPPROTO_IDP]                   = "idp",
 119         [IPPROTO_RSVP]                  = "rsvp",
 120         [IPPROTO_IPV6]                  = "ip6tun",
 121         [IPPROTO_ESP]                   = "esp",
 122         [IPPROTO_AH]                    = "ah",
 123         [IPPROTO_PIM]                   = "pim",
 124         [IPPROTO_COMP]                  = "comp",
 125 };
 126
 127 static const char *const tcp_state2str[TCP_CONNTRACK_MAX] = {
 128         [TCP_CONNTRACK_NONE]            = "NOSTATE",
 129         [TCP_CONNTRACK_SYN_SENT]        = "SYN_SENT",
 130         [TCP_CONNTRACK_SYN_RECV]        = "SYN_RECV",
 131         [TCP_CONNTRACK_ESTABLISHED]     = "ESTABLISHED",
 132         [TCP_CONNTRACK_FIN_WAIT]        = "FIN_WAIT",
 133         [TCP_CONNTRACK_CLOSE_WAIT]      = "CLOSE_WAIT",
 134         [TCP_CONNTRACK_LAST_ACK]        = "LAST_ACK",
 135         [TCP_CONNTRACK_TIME_WAIT]       = "TIME_WAIT",
 136         [TCP_CONNTRACK_CLOSE]           = "CLOSE",
 137         [TCP_CONNTRACK_SYN_SENT2]       = "SYN_SENT2",
 138 };
 139
 140 static const uint8_t tcp_states[] = {
 141         TCP_CONNTRACK_SYN_SENT,
 142         TCP_CONNTRACK_SYN_RECV,
 143         TCP_CONNTRACK_ESTABLISHED,
 144         TCP_CONNTRACK_FIN_WAIT,
 145         TCP_CONNTRACK_CLOSE_WAIT,
 146         TCP_CONNTRACK_LAST_ACK,
 147         TCP_CONNTRACK_TIME_WAIT,
 148         TCP_CONNTRACK_CLOSE,
 149         TCP_CONNTRACK_SYN_SENT2,
 150         TCP_CONNTRACK_NONE,
 151 };
 152
 153 static const char *const dccp_state2str[DCCP_CONNTRACK_MAX] = {
 154         [DCCP_CONNTRACK_NONE]           = "NOSTATE",
 155         [DCCP_CONNTRACK_REQUEST]        = "REQUEST",
 156         [DCCP_CONNTRACK_RESPOND]        = "RESPOND",
 157         [DCCP_CONNTRACK_PARTOPEN]       = "PARTOPEN",
 158         [DCCP_CONNTRACK_OPEN]           = "OPEN",
 159         [DCCP_CONNTRACK_CLOSEREQ]       = "CLOSEREQ",
 160         [DCCP_CONNTRACK_CLOSING]        = "CLOSING",
 161         [DCCP_CONNTRACK_TIMEWAIT]       = "TIMEWAIT",
 162         [DCCP_CONNTRACK_IGNORE]         = "IGNORE",
 163         [DCCP_CONNTRACK_INVALID]        = "INVALID",
 164 };
 165
 166 static const uint8_t dccp_states[] = {
 167         DCCP_CONNTRACK_NONE,
 168         DCCP_CONNTRACK_REQUEST,
 169         DCCP_CONNTRACK_RESPOND,
 170         DCCP_CONNTRACK_PARTOPEN,
 171         DCCP_CONNTRACK_OPEN,
 172         DCCP_CONNTRACK_CLOSEREQ,
 173         DCCP_CONNTRACK_CLOSING,
 174         DCCP_CONNTRACK_TIMEWAIT,
 175         DCCP_CONNTRACK_IGNORE,
 176         DCCP_CONNTRACK_INVALID,
 177 };
 178
 179 static const char *const sctp_state2str[SCTP_CONNTRACK_MAX] = {
 180         [SCTP_CONNTRACK_NONE]           = "NOSTATE",
 181         [SCTP_CONNTRACK_CLOSED]         = "CLOSED",
 182         [SCTP_CONNTRACK_COOKIE_WAIT]    = "COOKIE_WAIT",
 183         [SCTP_CONNTRACK_COOKIE_ECHOED]  = "COOKIE_ECHOED",
 184         [SCTP_CONNTRACK_ESTABLISHED]    = "ESTABLISHED",
 185         [SCTP_CONNTRACK_SHUTDOWN_SENT]  = "SHUTDOWN_SENT",
 186         [SCTP_CONNTRACK_SHUTDOWN_RECD]  = "SHUTDOWN_RECD",
 187         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = "SHUTDOWN_ACK_SENT",
 188 };
 189
 190 static const uint8_t sctp_states[] = {
 191         SCTP_CONNTRACK_NONE,
 192         SCTP_CONNTRACK_CLOSED,
 193         SCTP_CONNTRACK_COOKIE_WAIT,
 194         SCTP_CONNTRACK_COOKIE_ECHOED,
 195         SCTP_CONNTRACK_ESTABLISHED,
 196         SCTP_CONNTRACK_SHUTDOWN_SENT,
 197         SCTP_CONNTRACK_SHUTDOWN_RECD,
 198         SCTP_CONNTRACK_SHUTDOWN_ACK_SENT,
 199 };
 200
 201 static const struct nfct_filter_ipv4 filter_ipv4 = {
 202         .addr = __constant_htonl(INADDR_LOOPBACK),
 203         .mask = 0xffffffff,
 204 };
 205
 206 static const struct nfct_filter_ipv6 filter_ipv6 = {
 207         .addr = { 0x0, 0x0, 0x0, 0x1 },
 208         .mask = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff },
 209 };
 210
 211 static void signal_handler(int number)
 212 {
 213         switch (number) {
 214         case SIGINT:
 215                 sigint = 1;
 216                 break;
 217         case SIGHUP:
 218         default:
 219                 break;
 220         }
 221 }
 222
 223 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct);
 224 static void flow_entry_get_extended(struct flow_entry *n);
 225
 226 static void help(void)
 227 {
 228         printf("\nflowtop %s, top-like netfilter TCP/UDP flow tracking\n",
 229                VERSION_STRING);
 230         puts("http://www.netsniff-ng.org\n\n"
 231              "Usage: flowtop [options]\n"
 232              "Options:\n"
 233              "  -4|--ipv4              Show only IPv4 flows (default)\n"
 234              "  -6|--ipv6              Show only IPv6 flows (default)\n"
 235              "  -T|--tcp               Show only TCP flows (default)\n"
 236              "  -U|--udp               Show only UDP flows\n"
 237              "  -D|--dccp              Show only DCCP flows\n"
 238              "  -I|--icmp              Show only ICMP/ICMPv6 flows\n"
 239              "  -S|--sctp              Show only SCTP flows\n"
 240              "  -s|--show-src          Also show source, not only dest\n"
 241              "  -u|--update            Update GeoIP databases\n"
 242              "  -v|--version           Print version and exit\n"
 243              "  -h|--help              Print this help and exit\n\n"
 244              "Examples:\n"
 245              "  flowtop\n"
 246              "  flowtop -46UTDISs\n\n"
 247              "Note:\n"
 248              "  If netfilter is not running, you can activate it with e.g.:\n"
 249              "   iptables -A INPUT -p tcp -m state --state ESTABLISHED -j ACCEPT\n"
 250              "   iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT\n\n"
 251              "Please report bugs to <bugs@netsniff-ng.org>\n"
 252              "Copyright (C) 2011-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
 253              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
 254              "Swiss federal institute of technology (ETH Zurich)\n"
 255              "License: GNU GPL version 2.0\n"
 256              "This is free software: you are free to change and redistribute it.\n"
 257              "There is NO WARRANTY, to the extent permitted by law.\n");
 258         die();
 259 }
 260
 261 static void version(void)
 262 {
 263         printf("\nflowtop %s, top-like netfilter TCP/UDP flow tracking\n",
 264                VERSION_LONG);
 265         puts("http://www.netsniff-ng.org\n\n"
 266              "Please report bugs to <bugs@netsniff-ng.org>\n"
 267              "Copyright (C) 2011-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
 268              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
 269              "Swiss federal institute of technology (ETH Zurich)\n"
 270              "License: GNU GPL version 2.0\n"
 271              "This is free software: you are free to change and redistribute it.\n"
 272              "There is NO WARRANTY, to the extent permitted by law.\n");
 273         die();
 274 }
 275
 276 static inline struct flow_entry *flow_entry_xalloc(void)
 277 {
 278         return xzmalloc(sizeof(struct flow_entry));
 279 }
 280
 281 static inline void flow_entry_xfree(struct flow_entry *n)
 282 {
 283         xfree(n);
 284 }
 285
 286 static inline void flow_list_init(struct flow_list *fl)
 287 {
 288         fl->head = NULL;
 289         spinlock_init(&fl->lock);
 290 }
 291
 292 static void flow_list_new_entry(struct flow_list *fl, struct nf_conntrack *ct)
 293 {
 294         struct flow_entry *n = flow_entry_xalloc();
 295
 296         flow_entry_from_ct(n, ct);
 297         flow_entry_get_extended(n);
 298
 299         rcu_assign_pointer(n->next, fl->head);
 300         rcu_assign_pointer(fl->head, n);
 301 }
 302
 303 static struct flow_entry *flow_list_find_id(struct flow_list *fl,
 304                                             uint32_t id)
 305 {
 306         struct flow_entry *n = rcu_dereference(fl->head);
 307
 308         while (n != NULL) {
 309                 if (n->flow_id == id)
 310                         return n;
 311
 312                 n = rcu_dereference(n->next);
 313         }
 314
 315         return NULL;
 316 }
 317
 318 static struct flow_entry *flow_list_find_prev_id(struct flow_list *fl,
 319                                                  uint32_t id)
 320 {
 321         struct flow_entry *n = rcu_dereference(fl->head), *tmp;
 322
 323         if (n->flow_id == id)
 324                 return NULL;
 325
 326         while ((tmp = rcu_dereference(n->next)) != NULL) {
 327                 if (tmp->flow_id == id)
 328                         return n;
 329
 330                 n = tmp;
 331         }
 332
 333         return NULL;
 334 }
 335
 336 static void flow_list_update_entry(struct flow_list *fl,
 337                                    struct nf_conntrack *ct)
 338 {
 339         int do_ext = 0;
 340         struct flow_entry *n;
 341
 342         n = flow_list_find_id(fl, nfct_get_attr_u32(ct, ATTR_ID));
 343         if (n == NULL) {
 344                 n = flow_entry_xalloc();
 345                 do_ext = 1;
 346         }
 347
 348         flow_entry_from_ct(n, ct);
 349         if (do_ext) {
 350                 flow_entry_get_extended(n);
 351
 352                 rcu_assign_pointer(n->next, fl->head);
 353                 rcu_assign_pointer(fl->head, n);
 354         }
 355 }
 356
 357 static void flow_list_destroy_entry(struct flow_list *fl,
 358                                     struct nf_conntrack *ct)
 359 {
 360         struct flow_entry *n1, *n2;
 361         uint32_t id = nfct_get_attr_u32(ct, ATTR_ID);
 362
 363         n1 = flow_list_find_id(fl, id);
 364         if (n1) {
 365                 n2 = flow_list_find_prev_id(fl, id);
 366                 if (n2) {
 367                         rcu_assign_pointer(n2->next, n1->next);
 368                         n1->next = NULL;
 369
 370                         flow_entry_xfree(n1);
 371                 } else {
 372                         flow_entry_xfree(fl->head);
 373                         fl->head = NULL;
 374                 }
 375         }
 376 }
 377
 378 static void flow_list_destroy(struct flow_list *fl)
 379 {
 380         struct flow_entry *n;
 381
 382         while (fl->head != NULL) {
 383                 n = rcu_dereference(fl->head->next);
 384                 fl->head->next = NULL;
 385
 386                 flow_entry_xfree(fl->head);
 387                 rcu_assign_pointer(fl->head, n);
 388         }
 389
 390         synchronize_rcu();
 391         spinlock_destroy(&fl->lock);
 392 }
 393
 394 static int walk_process(char *process, struct flow_entry *n)
 395 {
 396         int ret;
 397         DIR *dir;
 398         struct dirent *ent;
 399         char path[1024];
 400
 401         if (snprintf(path, sizeof(path), "/proc/%s/fd", process) == -1)
 402                 panic("giant process name! %s\n", process);
 403
 404         dir = opendir(path);
 405         if (!dir)
 406                 return 0;
 407
 408         while ((ent = readdir(dir))) {
 409                 struct stat statbuf;
 410
 411                 if (snprintf(path, sizeof(path), "/proc/%s/fd/%s",
 412                              process, ent->d_name) < 0)
 413                         continue;
 414
 415                 if (stat(path, &statbuf) < 0)
 416                         continue;
 417
 418                 if (S_ISSOCK(statbuf.st_mode) && n->inode == statbuf.st_ino) {
 419                         memset(n->cmdline, 0, sizeof(n->cmdline));
 420
 421                         snprintf(path, sizeof(path), "/proc/%s/exe", process);
 422
 423                         ret = readlink(path, n->cmdline,
 424                                        sizeof(n->cmdline) - 1);
 425                         if (ret < 0)
 426                                 panic("readlink error: %s\n", strerror(errno));
 427
 428                         n->procnum = atoi(process);
 429                         closedir(dir);
 430                         return 1;
 431                 }
 432         }
 433
 434         closedir(dir);
 435         return 0;
 436 }
 437
 438 static void walk_processes(struct flow_entry *n)
 439 {
 440         int ret;
 441         DIR *dir;
 442         struct dirent *ent;
 443
 444         /* n->inode must be set */
 445         if (n->inode <= 0) {
 446                 memset(n->cmdline, 0, sizeof(n->cmdline));
 447                 return;
 448         }
 449
 450         dir = opendir("/proc");
 451         if (!dir)
 452                 panic("Cannot open /proc!\n");
 453
 454         while ((ent = readdir(dir))) {
 455                 if (strspn(ent->d_name, "0123456789") == strlen(ent->d_name)) {
 456                         ret = walk_process(ent->d_name, n);
 457                         if (ret > 0)
 458                                 break;
 459                 }
 460         }
 461
 462         closedir(dir);
 463 }
 464
 465 static int get_port_inode(uint16_t port, int proto, int is_ip6)
 466 {
 467         int ret = -ENOENT;
 468         char path[128], buff[1024];
 469         FILE *proc;
 470
 471         memset(path, 0, sizeof(path));
 472         snprintf(path, sizeof(path), "/proc/net/%s%s",
 473                  l4proto2str[proto], is_ip6 ? "6" : "");
 474
 475         proc = fopen(path, "r");
 476         if (!proc)
 477                 return -EIO;
 478
 479         memset(buff, 0, sizeof(buff));
 480
 481         while (fgets(buff, sizeof(buff), proc) != NULL) {
 482                 int inode = 0;
 483                 unsigned int lport = 0;
 484
 485                 buff[sizeof(buff) - 1] = 0;
 486                 if (sscanf(buff, "%*u: %*X:%X %*X:%*X %*X %*X:%*X %*X:%*X "
 487                            "%*X %*u %*u %u", &lport, &inode) == 2) {
 488                         if ((uint16_t) lport == port) {
 489                                 ret = inode;
 490                                 break;
 491                         }
 492                 }
 493
 494                 memset(buff, 0, sizeof(buff));
 495         }
 496
 497         fclose(proc);
 498         return ret;
 499 }
 500
 501 #define CP_NFCT(elem, attr, x)                          \
 502         do { n->elem = nfct_get_attr_u##x(ct,(attr)); } while (0)
 503 #define CP_NFCT_BUFF(elem, attr) do {                   \
 504         const uint8_t *buff = nfct_get_attr(ct,(attr)); \
 505         if (buff != NULL)                               \
 506                 memcpy(n->elem, buff, sizeof(n->elem)); \
 507 } while (0)
 508
 509 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct)
 510 {
 511         CP_NFCT(l3_proto, ATTR_ORIG_L3PROTO, 8);
 512         CP_NFCT(l4_proto, ATTR_ORIG_L4PROTO, 8);
 513
 514         CP_NFCT(ip4_src_addr, ATTR_ORIG_IPV4_SRC, 32);
 515         CP_NFCT(ip4_dst_addr, ATTR_ORIG_IPV4_DST, 32);
 516
 517         CP_NFCT(port_src, ATTR_ORIG_PORT_SRC, 16);
 518         CP_NFCT(port_dst, ATTR_ORIG_PORT_DST, 16);
 519
 520         CP_NFCT(status, ATTR_STATUS, 32);
 521
 522         CP_NFCT(tcp_state, ATTR_TCP_STATE, 8);
 523         CP_NFCT(tcp_flags, ATTR_TCP_FLAGS_ORIG, 8);
 524         CP_NFCT(sctp_state, ATTR_SCTP_STATE, 8);
 525         CP_NFCT(dccp_state, ATTR_DCCP_STATE, 8);
 526
 527         CP_NFCT(counter_pkts, ATTR_ORIG_COUNTER_PACKETS, 64);
 528         CP_NFCT(counter_bytes, ATTR_ORIG_COUNTER_BYTES, 64);
 529
 530         CP_NFCT(timestamp_start, ATTR_TIMESTAMP_START, 64);
 531         CP_NFCT(timestamp_stop, ATTR_TIMESTAMP_STOP, 64);
 532
 533         CP_NFCT(flow_id, ATTR_ID, 32);
 534         CP_NFCT(use, ATTR_USE, 32);
 535
 536         CP_NFCT_BUFF(ip6_src_addr, ATTR_ORIG_IPV6_SRC);
 537         CP_NFCT_BUFF(ip6_dst_addr, ATTR_ORIG_IPV6_DST);
 538
 539         n->port_src = ntohs(n->port_src);
 540         n->port_dst = ntohs(n->port_dst);
 541
 542         n->ip4_src_addr = ntohl(n->ip4_src_addr);
 543         n->ip4_dst_addr = ntohl(n->ip4_dst_addr);
 544 }
 545
 546 enum flow_entry_direction {
 547         flow_entry_src,
 548         flow_entry_dst,
 549 };
 550
 551 static inline int flow_entry_get_extended_is_dns(struct flow_entry *n)
 552 {
 553         /* We don't want to analyze / display DNS itself, since we
 554          * use it to resolve reverse dns.
 555          */
 556         return n->port_src == 53 || n->port_dst == 53;
 557 }
 558
 559 #define SELFLD(dir,src_member,dst_member)       \
 560         (((dir) == flow_entry_src) ? n->src_member : n->dst_member)
 561
 562 static void flow_entry_get_sain4_obj(struct flow_entry *n,
 563                                      enum flow_entry_direction dir,
 564                                      struct sockaddr_in *sa)
 565 {
 566         memset(sa, 0, sizeof(*sa));
 567         sa->sin_family = PF_INET;
 568         sa->sin_addr.s_addr = htonl(SELFLD(dir, ip4_src_addr, ip4_dst_addr));
 569 }
 570
 571 static void flow_entry_get_sain6_obj(struct flow_entry *n,
 572                                      enum flow_entry_direction dir,
 573                                      struct sockaddr_in6 *sa)
 574 {
 575         memset(sa, 0, sizeof(*sa));
 576         sa->sin6_family = PF_INET6;
 577
 578         memcpy(&sa->sin6_addr, SELFLD(dir, ip6_src_addr, ip6_dst_addr),
 579                sizeof(sa->sin6_addr));
 580 }
 581
 582 static void
 583 flow_entry_geo_city_lookup_generic(struct flow_entry *n,
 584                                    enum flow_entry_direction dir)
 585 {
 586         struct sockaddr_in sa4;
 587         struct sockaddr_in6 sa6;
 588         const char *city = NULL;
 589
 590         switch (n->l3_proto) {
 591         default:
 592                 bug();
 593
 594         case AF_INET:
 595                 flow_entry_get_sain4_obj(n, dir, &sa4);
 596                 city = geoip4_city_name(sa4);
 597                 break;
 598
 599         case AF_INET6:
 600                 flow_entry_get_sain6_obj(n, dir, &sa6);
 601                 city = geoip6_city_name(sa6);
 602                 break;
 603         }
 604
 605         bug_on(sizeof(n->city_src) != sizeof(n->city_dst));
 606
 607         if (city) {
 608                 memcpy(SELFLD(dir, city_src, city_dst), city,
 609                        min(sizeof(n->city_src), strlen(city)));
 610         } else {
 611                 memset(SELFLD(dir, city_src, city_dst), 0,
 612                        sizeof(n->city_src));
 613         }
 614 }
 615
 616 static void
 617 flow_entry_geo_country_lookup_generic(struct flow_entry *n,
 618                                       enum flow_entry_direction dir)
 619 {
 620         struct sockaddr_in sa4;
 621         struct sockaddr_in6 sa6;
 622         const char *country = NULL;
 623
 624         switch (n->l3_proto) {
 625         default:
 626                 bug();
 627
 628         case AF_INET:
 629                 flow_entry_get_sain4_obj(n, dir, &sa4);
 630                 country = geoip4_country_name(sa4);
 631                 break;
 632
 633         case AF_INET6:
 634                 flow_entry_get_sain6_obj(n, dir, &sa6);
 635                 country = geoip6_country_name(sa6);
 636                 break;
 637         }
 638
 639         bug_on(sizeof(n->country_src) != sizeof(n->country_dst));
 640
 641         if (country) {
 642                 memcpy(SELFLD(dir, country_src, country_dst), country,
 643                        min(sizeof(n->country_src), strlen(country)));
 644         } else {
 645                 memset(SELFLD(dir, country_src, country_dst), 0,
 646                        sizeof(n->country_src));
 647         }
 648 }
 649
 650 static void flow_entry_get_extended_geo(struct flow_entry *n,
 651                                         enum flow_entry_direction dir)
 652 {
 653         flow_entry_geo_city_lookup_generic(n, dir);
 654         flow_entry_geo_country_lookup_generic(n, dir);
 655 }
 656
 657 static void flow_entry_get_extended_revdns(struct flow_entry *n,
 658                                            enum flow_entry_direction dir)
 659 {
 660         size_t sa_len;
 661         struct sockaddr_in sa4;
 662         struct sockaddr_in6 sa6;
 663         struct sockaddr *sa;
 664         struct hostent *hent;
 665
 666         switch (n->l3_proto) {
 667         default:
 668                 bug();
 669
 670         case AF_INET:
 671                 flow_entry_get_sain4_obj(n, dir, &sa4);
 672                 sa = (struct sockaddr *) &sa4;
 673                 sa_len = sizeof(sa4);
 674                 hent = gethostbyaddr(&sa4.sin_addr, sizeof(sa4.sin_addr), AF_INET);
 675                 break;
 676
 677         case AF_INET6:
 678                 flow_entry_get_sain6_obj(n, dir, &sa6);
 679                 sa = (struct sockaddr *) &sa6;
 680                 sa_len = sizeof(sa6);
 681                 hent = gethostbyaddr(&sa6.sin6_addr, sizeof(sa6.sin6_addr), AF_INET6);
 682                 break;
 683         }
 684
 685         bug_on(sizeof(n->rev_dns_src) != sizeof(n->rev_dns_dst));
 686         getnameinfo(sa, sa_len, SELFLD(dir, rev_dns_src, rev_dns_dst),
 687                     sizeof(n->rev_dns_src), NULL, 0, NI_NUMERICHOST);
 688
 689         if (hent) {
 690                 memset(n->rev_dns_dst, 0, sizeof(n->rev_dns_dst));
 691                 memcpy(SELFLD(dir, rev_dns_src, rev_dns_dst),
 692                        hent->h_name, min(sizeof(n->rev_dns_src),
 693                                          strlen(hent->h_name)));
 694         }
 695 }
 696
 697 static void flow_entry_get_extended(struct flow_entry *n)
 698 {
 699         if (n->flow_id == 0 || flow_entry_get_extended_is_dns(n))
 700                 return;
 701
 702         flow_entry_get_extended_revdns(n, flow_entry_src);
 703         flow_entry_get_extended_geo(n, flow_entry_src);
 704
 705         flow_entry_get_extended_revdns(n, flow_entry_dst);
 706         flow_entry_get_extended_geo(n, flow_entry_dst);
 707
 708         /* Lookup application */
 709         n->inode = get_port_inode(n->port_src, n->l4_proto,
 710                                   n->l3_proto == AF_INET6);
 711         if (n->inode > 0)
 712                 walk_processes(n);
 713 }
 714
 715 static uint16_t presenter_get_port(uint16_t src, uint16_t dst, int tcp)
 716 {
 717         if (src < dst && src < 1024) {
 718                 return src;
 719         } else if (dst < src && dst < 1024) {
 720                 return dst;
 721         } else {
 722                 const char *tmp1, *tmp2;
 723                 if (tcp) {
 724                         tmp1 = lookup_port_tcp(src);
 725                         tmp2 = lookup_port_tcp(dst);
 726                 } else {
 727                         tmp1 = lookup_port_udp(src);
 728                         tmp2 = lookup_port_udp(dst);
 729                 }
 730                 if (tmp1 && !tmp2) {
 731                         return src;
 732                 } else if (!tmp1 && tmp2) {
 733                         return dst;
 734                 } else {
 735                         if (src < dst)
 736                                 return src;
 737                         else
 738                                 return dst;
 739                 }
 740         }
 741 }
 742
 743 static WINDOW *presenter_screen_init(void)
 744 {
 745         WINDOW *screen = initscr();
 746
 747         noecho();
 748         cbreak();
 749         keypad(stdscr, TRUE);
 750         nodelay(screen, TRUE);
 751         refresh();
 752         wrefresh(screen);
 753
 754         return screen;
 755 }
 756
 757 static void presenter_screen_do_line(WINDOW *screen, struct flow_entry *n,
 758                                      unsigned int *line)
 759 {
 760         char tmp[128], *pname = NULL;
 761         uint16_t port;
 762
 763         mvwprintw(screen, *line, 2, "");
 764
 765         /* PID, application name */
 766         if (n->procnum > 0) {
 767                 slprintf(tmp, sizeof(tmp), "%s(%u)", basename(n->cmdline),
 768                          n->procnum);
 769
 770                 printw("[");
 771                 attron(COLOR_PAIR(3));
 772                 printw("%s", tmp);
 773                 attroff(COLOR_PAIR(3));
 774                 printw("]:");
 775         }
 776
 777         /* L3 protocol, L4 protocol, states */
 778         printw("%s:%s", l3proto2str[n->l3_proto], l4proto2str[n->l4_proto]);
 779         printw("[");
 780         attron(COLOR_PAIR(3));
 781         switch (n->l4_proto) {
 782         case IPPROTO_TCP:
 783                 printw("%s", tcp_state2str[n->tcp_state]);
 784                 break;
 785         case IPPROTO_SCTP:
 786                 printw("%s", sctp_state2str[n->sctp_state]);
 787                 break;
 788         case IPPROTO_DCCP:
 789                 printw("%s", dccp_state2str[n->dccp_state]);
 790                 break;
 791         case IPPROTO_UDP:
 792         case IPPROTO_UDPLITE:
 793         case IPPROTO_ICMP:
 794         case IPPROTO_ICMPV6:
 795                 printw("NOSTATE");
 796                 break;
 797         }
 798         attroff(COLOR_PAIR(3));
 799         printw("]");
 800
 801         /* Guess application port */
 802         switch (n->l4_proto) {
 803         case IPPROTO_TCP:
 804                 port = presenter_get_port(n->port_src, n->port_dst, 1);
 805                 pname = lookup_port_tcp(port);
 806                 break;
 807         case IPPROTO_UDP:
 808         case IPPROTO_UDPLITE:
 809                 port = presenter_get_port(n->port_src, n->port_dst, 0);
 810                 pname = lookup_port_udp(port);
 811                 break;
 812         }
 813         if (pname) {
 814                 attron(A_BOLD);
 815                 printw(":%s", pname);
 816                 attroff(A_BOLD);
 817         }
 818         printw(" ->");
 819
 820         /* Number packets, bytes */
 821         if (n->counter_pkts > 0 && n->counter_bytes > 0)
 822                 printw(" (%llu pkts, %llu bytes) ->",
 823                        n->counter_pkts, n->counter_bytes);
 824
 825         /* Show source information: reverse DNS, port, country, city */
 826         if (show_src) {
 827                 attron(COLOR_PAIR(1));
 828                 mvwprintw(screen, ++(*line), 8, "src: %s", n->rev_dns_src);
 829                 attroff(COLOR_PAIR(1));
 830
 831                 printw(":%u", n->port_src);
 832
 833                 if (n->country_src[0]) {
 834                         printw(" (");
 835
 836                         attron(COLOR_PAIR(4));
 837                         printw("%s", n->country_src);
 838                         attroff(COLOR_PAIR(4));
 839
 840                         if (n->city_src[0])
 841                                 printw(", %s", n->city_src);
 842
 843                         printw(")");
 844                 }
 845
 846                 printw(" => ");
 847         }
 848
 849         /* Show dest information: reverse DNS, port, country, city */
 850         attron(COLOR_PAIR(2));
 851         mvwprintw(screen, ++(*line), 8, "dst: %s", n->rev_dns_dst);
 852         attroff(COLOR_PAIR(2));
 853
 854         printw(":%u", n->port_dst);
 855
 856         if (n->country_dst[0]) {
 857                 printw(" (");
 858
 859                 attron(COLOR_PAIR(4));
 860                 printw("%s", n->country_dst);
 861                 attroff(COLOR_PAIR(4));
 862
 863                 if (n->city_dst[0])
 864                         printw(", %s", n->city_dst);
 865
 866                 printw(")");
 867         }
 868 }
 869
 870 static inline int presenter_flow_wrong_state(struct flow_entry *n, int state)
 871 {
 872         int ret = 1;
 873
 874         switch (n->l4_proto) {
 875         case IPPROTO_TCP:
 876                 if (n->tcp_state == state)
 877                         ret = 0;
 878                 break;
 879         case IPPROTO_SCTP:
 880                 if (n->sctp_state == state)
 881                         ret = 0;
 882                 break;
 883         case IPPROTO_DCCP:
 884                 if (n->dccp_state == state)
 885                         ret = 0;
 886                 break;
 887         case IPPROTO_UDP:
 888         case IPPROTO_UDPLITE:
 889         case IPPROTO_ICMP:
 890         case IPPROTO_ICMPV6:
 891                 ret = 0;
 892                 break;
 893         }
 894
 895         return ret;
 896 }
 897
 898 static void presenter_screen_update(WINDOW *screen, struct flow_list *fl,
 899                                     int skip_lines)
 900 {
 901         int i, j, maxy;
 902         unsigned int line = 3;
 903         struct flow_entry *n;
 904         uint8_t protocols[] = {
 905                 IPPROTO_TCP,
 906                 IPPROTO_DCCP,
 907                 IPPROTO_SCTP,
 908                 IPPROTO_UDP,
 909                 IPPROTO_UDPLITE,
 910                 IPPROTO_ICMP,
 911                 IPPROTO_ICMPV6,
 912         };
 913         size_t protocol_state_size[] = {
 914                 [IPPROTO_TCP] = array_size(tcp_states),
 915                 [IPPROTO_DCCP] = array_size(dccp_states),
 916                 [IPPROTO_SCTP] = array_size(sctp_states),
 917                 [IPPROTO_UDP] = 1,
 918                 [IPPROTO_UDPLITE] = 1,
 919                 [IPPROTO_ICMP] = 1,
 920                 [IPPROTO_ICMPV6] = 1,
 921         };
 922
 923         curs_set(0);
 924
 925         maxy = getmaxy(screen);
 926         maxy -= 6;
 927
 928         start_color();
 929         init_pair(1, COLOR_RED, COLOR_BLACK);
 930         init_pair(2, COLOR_BLUE, COLOR_BLACK);
 931         init_pair(3, COLOR_YELLOW, COLOR_BLACK);
 932         init_pair(4, COLOR_GREEN, COLOR_BLACK);
 933
 934         wclear(screen);
 935         clear();
 936
 937         mvwprintw(screen, 1, 2, "Kernel netfilter flows for %s%s%s%s%s%s"
 938                   "[+%d]", what & INCLUDE_TCP ? "TCP, " : "" ,
 939                   what & INCLUDE_UDP ? "UDP, " : "",
 940                   what & INCLUDE_SCTP ? "SCTP, " : "",
 941                   what & INCLUDE_DCCP ? "DCCP, " : "",
 942                   what & INCLUDE_ICMP && what & INCLUDE_IPV4 ? "ICMP, " : "",
 943                   what & INCLUDE_ICMP && what & INCLUDE_IPV6 ? "ICMP6, " : "",
 944                   skip_lines);
 945
 946         rcu_read_lock();
 947
 948         if (rcu_dereference(fl->head) == NULL)
 949                 mvwprintw(screen, line, 2, "(No active sessions! "
 950                           "Is netfilter running?)");
 951
 952         for (i = 0; i < array_size(protocols); i++) {
 953                 for (j = 0; j < protocol_state_size[protocols[i]]; j++) {
 954                         n = rcu_dereference(fl->head);
 955                         while (n && maxy > 0) {
 956                                 int skip_entry = 0;
 957
 958                                 if (n->l4_proto != protocols[i])
 959                                         skip_entry = 1;
 960                                 if (presenter_flow_wrong_state(n, j))
 961                                         skip_entry = 1;
 962                                 if (presenter_get_port(n->port_src,
 963                                                        n->port_dst, 0) == 53)
 964                                         skip_entry = 1;
 965                                 if (skip_entry) {
 966                                         n = rcu_dereference(n->next);
 967                                         continue;
 968                                 }
 969                                 if (skip_lines > 0) {
 970                                         n = rcu_dereference(n->next);
 971                                         skip_lines--;
 972                                         continue;
 973                                 }
 974
 975                                 presenter_screen_do_line(screen, n, &line);
 976
 977                                 line++;
 978                                 maxy -= (2 + 1 * show_src);
 979                                 n = rcu_dereference(n->next);
 980                         }
 981                 }
 982         }
 983
 984         rcu_read_unlock();
 985
 986         wrefresh(screen);
 987         refresh();
 988 }
 989
 990 static inline void presenter_screen_end(void)
 991 {
 992         endwin();
 993 }
 994
 995 static void presenter(void)
 996 {
 997         int skip_lines = 0;
 998         WINDOW *screen;
 999
1000         dissector_init_ethernet(0);
1001         screen = presenter_screen_init();
1002
1003         rcu_register_thread();
1004         while (!sigint) {
1005                 switch (getch()) {
1006                 case 'q':
1007                         sigint = 1;
1008                         break;
1009                 case KEY_UP:
1010                 case 'u':
1011                 case 'k':
1012                         skip_lines--;
1013                         if (skip_lines < 0)
1014                                 skip_lines = 0;
1015                         break;
1016                 case KEY_DOWN:
1017                 case 'd':
1018                 case 'j':
1019                         skip_lines++;
1020                         if (skip_lines > SCROLL_MAX)
1021                                 skip_lines = SCROLL_MAX;
1022                         break;
1023                 default:
1024                         fflush(stdin);
1025                         break;
1026                 }
1027
1028                 presenter_screen_update(screen, &flow_list, skip_lines);
1029                 usleep(100000);
1030         }
1031         rcu_unregister_thread();
1032
1033         presenter_screen_end();
1034         dissector_cleanup_ethernet();
1035 }
1036
1037 static int collector_cb(enum nf_conntrack_msg_type type,
1038                         struct nf_conntrack *ct, void *data)
1039 {
1040         if (sigint)
1041                 return NFCT_CB_STOP;
1042
1043         synchronize_rcu();
1044         spinlock_lock(&flow_list.lock);
1045
1046         switch (type) {
1047         case NFCT_T_NEW:
1048                 flow_list_new_entry(&flow_list, ct);
1049                 break;
1050         case NFCT_T_UPDATE:
1051                 flow_list_update_entry(&flow_list, ct);
1052                 break;
1053         case NFCT_T_DESTROY:
1054                 flow_list_destroy_entry(&flow_list, ct);
1055                 break;
1056         default:
1057                 break;
1058         }
1059
1060         spinlock_unlock(&flow_list.lock);
1061
1062         return NFCT_CB_CONTINUE;
1063 }
1064
1065 static inline void collector_flush(struct nfct_handle *handle, uint8_t family)
1066 {
1067         nfct_query(handle, NFCT_Q_FLUSH, &family);
1068 }
1069
1070 static void *collector(void *null)
1071 {
1072         int ret;
1073         struct nfct_handle *handle;
1074         struct nfct_filter *filter;
1075
1076         handle = nfct_open(CONNTRACK, NF_NETLINK_CONNTRACK_NEW |
1077                                       NF_NETLINK_CONNTRACK_UPDATE |
1078                                       NF_NETLINK_CONNTRACK_DESTROY);
1079         if (!handle)
1080                 panic("Cannot create a nfct handle!\n");
1081
1082         collector_flush(handle, AF_INET);
1083         collector_flush(handle, AF_INET6);
1084
1085         filter = nfct_filter_create();
1086         if (!filter)
1087                 panic("Cannot create a nfct filter!\n");
1088
1089         ret = nfct_filter_attach(nfct_fd(handle), filter);
1090         if (ret < 0)
1091                 panic("Cannot attach filter to handle!\n");
1092
1093         if (what & INCLUDE_UDP) {
1094                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDP);
1095                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDPLITE);
1096         }
1097         if (what & INCLUDE_TCP)
1098                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_TCP);
1099         if (what & INCLUDE_DCCP)
1100                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_DCCP);
1101         if (what & INCLUDE_SCTP)
1102                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_SCTP);
1103         if (what & INCLUDE_ICMP && what & INCLUDE_IPV4)
1104                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMP);
1105         if (what & INCLUDE_ICMP && what & INCLUDE_IPV6)
1106                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMPV6);
1107         if (what & INCLUDE_IPV4) {
1108                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV4, NFCT_FILTER_LOGIC_NEGATIVE);
1109                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV4, &filter_ipv4);
1110         }
1111         if (what & INCLUDE_IPV6) {
1112                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV6, NFCT_FILTER_LOGIC_NEGATIVE);
1113                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV6, &filter_ipv6);
1114         }
1115
1116         ret = nfct_filter_attach(nfct_fd(handle), filter);
1117         if (ret < 0)
1118                 panic("Cannot attach filter to handle!\n");
1119
1120         nfct_callback_register(handle, NFCT_T_ALL, collector_cb, NULL);
1121         nfct_filter_destroy(filter);
1122         flow_list_init(&flow_list);
1123
1124         rcu_register_thread();
1125
1126         while (!sigint && ret >= 0)
1127                 ret = nfct_catch(handle);
1128
1129         rcu_unregister_thread();
1130
1131         flow_list_destroy(&flow_list);
1132         nfct_close(handle);
1133
1134         pthread_exit(0);
1135 }
1136
1137 int main(int argc, char **argv)
1138 {
1139         pthread_t tid;
1140         int ret, c, opt_index, what_cmd = 0;
1141
1142         setfsuid(getuid());
1143         setfsgid(getgid());
1144
1145         while ((c = getopt_long(argc, argv, short_options, long_options,
1146                &opt_index)) != EOF) {
1147                 switch (c) {
1148                 case '4':
1149                         what_cmd |= INCLUDE_IPV4;
1150                         break;
1151                 case '6':
1152                         what_cmd |= INCLUDE_IPV6;
1153                         break;
1154                 case 'T':
1155                         what_cmd |= INCLUDE_TCP;
1156                         break;
1157                 case 'U':
1158                         what_cmd |= INCLUDE_UDP;
1159                         break;
1160                 case 'D':
1161                         what_cmd |= INCLUDE_DCCP;
1162                         break;
1163                 case 'I':
1164                         what_cmd |= INCLUDE_ICMP;
1165                         break;
1166                 case 'S':
1167                         what_cmd |= INCLUDE_SCTP;
1168                         break;
1169                 case 's':
1170                         show_src = 1;
1171                         break;
1172                 case 'u':
1173                         update_geoip();
1174                         die();
1175                         break;
1176                 case 'h':
1177                         help();
1178                         break;
1179                 case 'v':
1180                         version();
1181                         break;
1182                 default:
1183                         break;
1184                 }
1185         }
1186
1187         if (what_cmd > 0)
1188                 what = what_cmd;
1189
1190         rcu_init();
1191
1192         register_signal(SIGINT, signal_handler);
1193         register_signal(SIGHUP, signal_handler);
1194
1195         init_geoip(1);
1196
1197         ret = pthread_create(&tid, NULL, collector, NULL);
1198         if (ret < 0)
1199                 panic("Cannot create phthread!\n");
1200
1201         presenter();
1202
1203         destroy_geoip();
1204
1205         return 0;
1206 }