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