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 #include <inttypes.h>
  26
  27 #include "die.h"
  28 #include "xmalloc.h"
  29 #include "conntrack.h"
  30 #include "ioops.h"
  31 #include "config.h"
  32 #include "str.h"
  33 #include "sig.h"
  34 #include "geoip.h"
  35 #include "built_in.h"
  36 #include "locking.h"
  37 #include "dissector_eth.h"
  38 #include "pkt_buff.h"
  39 #include "screen.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         case SIGQUIT:
 216         case SIGTERM:
 217                 sigint = 1;
 218                 break;
 219         case SIGHUP:
 220         default:
 221                 break;
 222         }
 223 }
 224
 225 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct);
 226 static void flow_entry_get_extended(struct flow_entry *n);
 227
 228 static void help(void)
 229 {
 230         printf("\nflowtop %s, top-like netfilter TCP/UDP/SCTP/.. flow tracking\n",
 231                VERSION_STRING);
 232         puts("http://www.netsniff-ng.org\n\n"
 233              "Usage: flowtop [options]\n"
 234              "Options:\n"
 235              "  -4|--ipv4              Show only IPv4 flows (default)\n"
 236              "  -6|--ipv6              Show only IPv6 flows (default)\n"
 237              "  -T|--tcp               Show only TCP flows (default)\n"
 238              "  -U|--udp               Show only UDP flows\n"
 239              "  -D|--dccp              Show only DCCP flows\n"
 240              "  -I|--icmp              Show only ICMP/ICMPv6 flows\n"
 241              "  -S|--sctp              Show only SCTP flows\n"
 242              "  -s|--show-src          Also show source, not only dest\n"
 243              "  -u|--update            Update GeoIP databases\n"
 244              "  -v|--version           Print version and exit\n"
 245              "  -h|--help              Print this help and exit\n\n"
 246              "Examples:\n"
 247              "  flowtop\n"
 248              "  flowtop -46UTDISs\n\n"
 249              "Note:\n"
 250              "  If netfilter is not running, you can activate it with e.g.:\n"
 251              "   iptables -A INPUT -p tcp -m state --state ESTABLISHED -j ACCEPT\n"
 252              "   iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT\n\n"
 253              "Please report bugs to <bugs@netsniff-ng.org>\n"
 254              "Copyright (C) 2011-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
 255              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
 256              "Swiss federal institute of technology (ETH Zurich)\n"
 257              "License: GNU GPL version 2.0\n"
 258              "This is free software: you are free to change and redistribute it.\n"
 259              "There is NO WARRANTY, to the extent permitted by law.\n");
 260         die();
 261 }
 262
 263 static void version(void)
 264 {
 265         printf("\nflowtop %s, Git id: %s\n", VERSION_LONG, GITVERSION);
 266         puts("top-like netfilter TCP/UDP/SCTP/.. flow tracking\n"
 267              "http://www.netsniff-ng.org\n\n"
 268              "Please report bugs to <bugs@netsniff-ng.org>\n"
 269              "Copyright (C) 2011-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
 270              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
 271              "Swiss federal institute of technology (ETH Zurich)\n"
 272              "License: GNU GPL version 2.0\n"
 273              "This is free software: you are free to change and redistribute it.\n"
 274              "There is NO WARRANTY, to the extent permitted by law.\n");
 275         die();
 276 }
 277
 278 static inline struct flow_entry *flow_entry_xalloc(void)
 279 {
 280         return xzmalloc(sizeof(struct flow_entry));
 281 }
 282
 283 static inline void flow_entry_xfree(struct flow_entry *n)
 284 {
 285         xfree(n);
 286 }
 287
 288 static inline void flow_list_init(struct flow_list *fl)
 289 {
 290         fl->head = NULL;
 291         spinlock_init(&fl->lock);
 292 }
 293
 294 static void flow_list_new_entry(struct flow_list *fl, struct nf_conntrack *ct)
 295 {
 296         struct flow_entry *n = flow_entry_xalloc();
 297
 298         flow_entry_from_ct(n, ct);
 299         flow_entry_get_extended(n);
 300
 301         rcu_assign_pointer(n->next, fl->head);
 302         rcu_assign_pointer(fl->head, n);
 303 }
 304
 305 static struct flow_entry *flow_list_find_id(struct flow_list *fl,
 306                                             uint32_t id)
 307 {
 308         struct flow_entry *n = rcu_dereference(fl->head);
 309
 310         while (n != NULL) {
 311                 if (n->flow_id == id)
 312                         return n;
 313
 314                 n = rcu_dereference(n->next);
 315         }
 316
 317         return NULL;
 318 }
 319
 320 static struct flow_entry *flow_list_find_prev_id(struct flow_list *fl,
 321                                                  uint32_t id)
 322 {
 323         struct flow_entry *n = rcu_dereference(fl->head), *tmp;
 324
 325         if (n->flow_id == id)
 326                 return NULL;
 327
 328         while ((tmp = rcu_dereference(n->next)) != NULL) {
 329                 if (tmp->flow_id == id)
 330                         return n;
 331
 332                 n = tmp;
 333         }
 334
 335         return NULL;
 336 }
 337
 338 static void flow_list_update_entry(struct flow_list *fl,
 339                                    struct nf_conntrack *ct)
 340 {
 341         int do_ext = 0;
 342         struct flow_entry *n;
 343
 344         n = flow_list_find_id(fl, nfct_get_attr_u32(ct, ATTR_ID));
 345         if (n == NULL) {
 346                 n = flow_entry_xalloc();
 347                 do_ext = 1;
 348         }
 349
 350         flow_entry_from_ct(n, ct);
 351         if (do_ext) {
 352                 flow_entry_get_extended(n);
 353
 354                 rcu_assign_pointer(n->next, fl->head);
 355                 rcu_assign_pointer(fl->head, n);
 356         }
 357 }
 358
 359 static void flow_list_destroy_entry(struct flow_list *fl,
 360                                     struct nf_conntrack *ct)
 361 {
 362         struct flow_entry *n1, *n2;
 363         uint32_t id = nfct_get_attr_u32(ct, ATTR_ID);
 364
 365         n1 = flow_list_find_id(fl, id);
 366         if (n1) {
 367                 n2 = flow_list_find_prev_id(fl, id);
 368                 if (n2) {
 369                         rcu_assign_pointer(n2->next, n1->next);
 370                         n1->next = NULL;
 371
 372                         flow_entry_xfree(n1);
 373                 } else {
 374                         flow_entry_xfree(fl->head);
 375                         fl->head = NULL;
 376                 }
 377         }
 378 }
 379
 380 static void flow_list_destroy(struct flow_list *fl)
 381 {
 382         struct flow_entry *n;
 383
 384         while (fl->head != NULL) {
 385                 n = rcu_dereference(fl->head->next);
 386                 fl->head->next = NULL;
 387
 388                 flow_entry_xfree(fl->head);
 389                 rcu_assign_pointer(fl->head, n);
 390         }
 391
 392         synchronize_rcu();
 393         spinlock_destroy(&fl->lock);
 394 }
 395
 396 static int walk_process(const char *process, struct flow_entry *n)
 397 {
 398         int ret;
 399         DIR *dir;
 400         struct dirent *ent;
 401         char path[1024];
 402
 403         if (snprintf(path, sizeof(path), "/proc/%s/fd", process) == -1)
 404                 panic("giant process name! %s\n", process);
 405
 406         dir = opendir(path);
 407         if (!dir)
 408                 return 0;
 409
 410         while ((ent = readdir(dir))) {
 411                 struct stat statbuf;
 412
 413                 if (snprintf(path, sizeof(path), "/proc/%s/fd/%s",
 414                              process, ent->d_name) < 0)
 415                         continue;
 416
 417                 if (stat(path, &statbuf) < 0)
 418                         continue;
 419
 420                 if (S_ISSOCK(statbuf.st_mode) && (ino_t) n->inode == statbuf.st_ino) {
 421                         memset(n->cmdline, 0, sizeof(n->cmdline));
 422
 423                         snprintf(path, sizeof(path), "/proc/%s/exe", process);
 424
 425                         ret = readlink(path, n->cmdline,
 426                                        sizeof(n->cmdline) - 1);
 427                         if (ret < 0)
 428                                 panic("readlink error: %s\n", strerror(errno));
 429
 430                         n->procnum = atoi(process);
 431                         closedir(dir);
 432                         return 1;
 433                 }
 434         }
 435
 436         closedir(dir);
 437         return 0;
 438 }
 439
 440 static void walk_processes(struct flow_entry *n)
 441 {
 442         int ret;
 443         DIR *dir;
 444         struct dirent *ent;
 445
 446         /* n->inode must be set */
 447         if (n->inode <= 0) {
 448                 memset(n->cmdline, 0, sizeof(n->cmdline));
 449                 return;
 450         }
 451
 452         dir = opendir("/proc");
 453         if (!dir)
 454                 panic("Cannot open /proc!\n");
 455
 456         while ((ent = readdir(dir))) {
 457                 if (strspn(ent->d_name, "0123456789") == strlen(ent->d_name)) {
 458                         ret = walk_process(ent->d_name, n);
 459                         if (ret > 0)
 460                                 break;
 461                 }
 462         }
 463
 464         closedir(dir);
 465 }
 466
 467 static int get_port_inode(uint16_t port, int proto, int is_ip6)
 468 {
 469         int ret = -ENOENT;
 470         char path[128], buff[1024];
 471         FILE *proc;
 472
 473         memset(path, 0, sizeof(path));
 474         snprintf(path, sizeof(path), "/proc/net/%s%s",
 475                  l4proto2str[proto], is_ip6 ? "6" : "");
 476
 477         proc = fopen(path, "r");
 478         if (!proc)
 479                 return -EIO;
 480
 481         memset(buff, 0, sizeof(buff));
 482
 483         while (fgets(buff, sizeof(buff), proc) != NULL) {
 484                 int inode = 0;
 485                 unsigned int lport = 0;
 486
 487                 buff[sizeof(buff) - 1] = 0;
 488                 if (sscanf(buff, "%*u: %*X:%X %*X:%*X %*X %*X:%*X %*X:%*X "
 489                            "%*X %*u %*u %u", &lport, &inode) == 2) {
 490                         if ((uint16_t) lport == port) {
 491                                 ret = inode;
 492                                 break;
 493                         }
 494                 }
 495
 496                 memset(buff, 0, sizeof(buff));
 497         }
 498
 499         fclose(proc);
 500         return ret;
 501 }
 502
 503 #define CP_NFCT(elem, attr, x)                          \
 504         do { n->elem = nfct_get_attr_u##x(ct,(attr)); } while (0)
 505 #define CP_NFCT_BUFF(elem, attr) do {                   \
 506         const uint8_t *buff = nfct_get_attr(ct,(attr)); \
 507         if (buff != NULL)                               \
 508                 memcpy(n->elem, buff, sizeof(n->elem)); \
 509 } while (0)
 510
 511 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct)
 512 {
 513         CP_NFCT(l3_proto, ATTR_ORIG_L3PROTO, 8);
 514         CP_NFCT(l4_proto, ATTR_ORIG_L4PROTO, 8);
 515
 516         CP_NFCT(ip4_src_addr, ATTR_ORIG_IPV4_SRC, 32);
 517         CP_NFCT(ip4_dst_addr, ATTR_ORIG_IPV4_DST, 32);
 518
 519         CP_NFCT(port_src, ATTR_ORIG_PORT_SRC, 16);
 520         CP_NFCT(port_dst, ATTR_ORIG_PORT_DST, 16);
 521
 522         CP_NFCT(status, ATTR_STATUS, 32);
 523
 524         CP_NFCT(tcp_state, ATTR_TCP_STATE, 8);
 525         CP_NFCT(tcp_flags, ATTR_TCP_FLAGS_ORIG, 8);
 526         CP_NFCT(sctp_state, ATTR_SCTP_STATE, 8);
 527         CP_NFCT(dccp_state, ATTR_DCCP_STATE, 8);
 528
 529         CP_NFCT(counter_pkts, ATTR_ORIG_COUNTER_PACKETS, 64);
 530         CP_NFCT(counter_bytes, ATTR_ORIG_COUNTER_BYTES, 64);
 531
 532         CP_NFCT(timestamp_start, ATTR_TIMESTAMP_START, 64);
 533         CP_NFCT(timestamp_stop, ATTR_TIMESTAMP_STOP, 64);
 534
 535         CP_NFCT(flow_id, ATTR_ID, 32);
 536         CP_NFCT(use, ATTR_USE, 32);
 537
 538         CP_NFCT_BUFF(ip6_src_addr, ATTR_ORIG_IPV6_SRC);
 539         CP_NFCT_BUFF(ip6_dst_addr, ATTR_ORIG_IPV6_DST);
 540
 541         n->port_src = ntohs(n->port_src);
 542         n->port_dst = ntohs(n->port_dst);
 543
 544         n->ip4_src_addr = ntohl(n->ip4_src_addr);
 545         n->ip4_dst_addr = ntohl(n->ip4_dst_addr);
 546 }
 547
 548 enum flow_entry_direction {
 549         flow_entry_src,
 550         flow_entry_dst,
 551 };
 552
 553 static inline int flow_entry_get_extended_is_dns(struct flow_entry *n)
 554 {
 555         /* We don't want to analyze / display DNS itself, since we
 556          * use it to resolve reverse dns.
 557          */
 558         return n->port_src == 53 || n->port_dst == 53;
 559 }
 560
 561 #define SELFLD(dir,src_member,dst_member)       \
 562         (((dir) == flow_entry_src) ? n->src_member : n->dst_member)
 563
 564 static void flow_entry_get_sain4_obj(struct flow_entry *n,
 565                                      enum flow_entry_direction dir,
 566                                      struct sockaddr_in *sa)
 567 {
 568         memset(sa, 0, sizeof(*sa));
 569         sa->sin_family = PF_INET;
 570         sa->sin_addr.s_addr = htonl(SELFLD(dir, ip4_src_addr, ip4_dst_addr));
 571 }
 572
 573 static void flow_entry_get_sain6_obj(struct flow_entry *n,
 574                                      enum flow_entry_direction dir,
 575                                      struct sockaddr_in6 *sa)
 576 {
 577         memset(sa, 0, sizeof(*sa));
 578         sa->sin6_family = PF_INET6;
 579
 580         memcpy(&sa->sin6_addr, SELFLD(dir, ip6_src_addr, ip6_dst_addr),
 581                sizeof(sa->sin6_addr));
 582 }
 583
 584 static void
 585 flow_entry_geo_city_lookup_generic(struct flow_entry *n,
 586                                    enum flow_entry_direction dir)
 587 {
 588         struct sockaddr_in sa4;
 589         struct sockaddr_in6 sa6;
 590         const char *city = NULL;
 591
 592         switch (n->l3_proto) {
 593         default:
 594                 bug();
 595
 596         case AF_INET:
 597                 flow_entry_get_sain4_obj(n, dir, &sa4);
 598                 city = geoip4_city_name(&sa4);
 599                 break;
 600
 601         case AF_INET6:
 602                 flow_entry_get_sain6_obj(n, dir, &sa6);
 603                 city = geoip6_city_name(&sa6);
 604                 break;
 605         }
 606
 607         bug_on(sizeof(n->city_src) != sizeof(n->city_dst));
 608
 609         if (city) {
 610                 memcpy(SELFLD(dir, city_src, city_dst), city,
 611                        min(sizeof(n->city_src), strlen(city)));
 612         } else {
 613                 memset(SELFLD(dir, city_src, city_dst), 0,
 614                        sizeof(n->city_src));
 615         }
 616 }
 617
 618 static void
 619 flow_entry_geo_country_lookup_generic(struct flow_entry *n,
 620                                       enum flow_entry_direction dir)
 621 {
 622         struct sockaddr_in sa4;
 623         struct sockaddr_in6 sa6;
 624         const char *country = NULL;
 625
 626         switch (n->l3_proto) {
 627         default:
 628                 bug();
 629
 630         case AF_INET:
 631                 flow_entry_get_sain4_obj(n, dir, &sa4);
 632                 country = geoip4_country_name(&sa4);
 633                 break;
 634
 635         case AF_INET6:
 636                 flow_entry_get_sain6_obj(n, dir, &sa6);
 637                 country = geoip6_country_name(&sa6);
 638                 break;
 639         }
 640
 641         bug_on(sizeof(n->country_src) != sizeof(n->country_dst));
 642
 643         if (country) {
 644                 memcpy(SELFLD(dir, country_src, country_dst), country,
 645                        min(sizeof(n->country_src), strlen(country)));
 646         } else {
 647                 memset(SELFLD(dir, country_src, country_dst), 0,
 648                        sizeof(n->country_src));
 649         }
 650 }
 651
 652 static void flow_entry_get_extended_geo(struct flow_entry *n,
 653                                         enum flow_entry_direction dir)
 654 {
 655         flow_entry_geo_city_lookup_generic(n, dir);
 656         flow_entry_geo_country_lookup_generic(n, dir);
 657 }
 658
 659 static void flow_entry_get_extended_revdns(struct flow_entry *n,
 660                                            enum flow_entry_direction dir)
 661 {
 662         size_t sa_len;
 663         struct sockaddr_in sa4;
 664         struct sockaddr_in6 sa6;
 665         struct sockaddr *sa;
 666         struct hostent *hent;
 667
 668         switch (n->l3_proto) {
 669         default:
 670                 bug();
 671
 672         case AF_INET:
 673                 flow_entry_get_sain4_obj(n, dir, &sa4);
 674                 sa = (struct sockaddr *) &sa4;
 675                 sa_len = sizeof(sa4);
 676                 hent = gethostbyaddr(&sa4.sin_addr, sizeof(sa4.sin_addr), AF_INET);
 677                 break;
 678
 679         case AF_INET6:
 680                 flow_entry_get_sain6_obj(n, dir, &sa6);
 681                 sa = (struct sockaddr *) &sa6;
 682                 sa_len = sizeof(sa6);
 683                 hent = gethostbyaddr(&sa6.sin6_addr, sizeof(sa6.sin6_addr), AF_INET6);
 684                 break;
 685         }
 686
 687         bug_on(sizeof(n->rev_dns_src) != sizeof(n->rev_dns_dst));
 688         getnameinfo(sa, sa_len, SELFLD(dir, rev_dns_src, rev_dns_dst),
 689                     sizeof(n->rev_dns_src), NULL, 0, NI_NUMERICHOST);
 690
 691         if (hent) {
 692                 memset(n->rev_dns_dst, 0, sizeof(n->rev_dns_dst));
 693                 memcpy(SELFLD(dir, rev_dns_src, rev_dns_dst),
 694                        hent->h_name, min(sizeof(n->rev_dns_src),
 695                                          strlen(hent->h_name)));
 696         }
 697 }
 698
 699 static void flow_entry_get_extended(struct flow_entry *n)
 700 {
 701         if (n->flow_id == 0 || flow_entry_get_extended_is_dns(n))
 702                 return;
 703
 704         flow_entry_get_extended_revdns(n, flow_entry_src);
 705         flow_entry_get_extended_geo(n, flow_entry_src);
 706
 707         flow_entry_get_extended_revdns(n, flow_entry_dst);
 708         flow_entry_get_extended_geo(n, flow_entry_dst);
 709
 710         /* Lookup application */
 711         n->inode = get_port_inode(n->port_src, n->l4_proto,
 712                                   n->l3_proto == AF_INET6);
 713         if (n->inode > 0)
 714                 walk_processes(n);
 715 }
 716
 717 static uint16_t presenter_get_port(uint16_t src, uint16_t dst, int tcp)
 718 {
 719         if (src < dst && src < 1024) {
 720                 return src;
 721         } else if (dst < src && dst < 1024) {
 722                 return dst;
 723         } else {
 724                 const char *tmp1, *tmp2;
 725                 if (tcp) {
 726                         tmp1 = lookup_port_tcp(src);
 727                         tmp2 = lookup_port_tcp(dst);
 728                 } else {
 729                         tmp1 = lookup_port_udp(src);
 730                         tmp2 = lookup_port_udp(dst);
 731                 }
 732                 if (tmp1 && !tmp2) {
 733                         return src;
 734                 } else if (!tmp1 && tmp2) {
 735                         return dst;
 736                 } else {
 737                         if (src < dst)
 738                                 return src;
 739                         else
 740                                 return dst;
 741                 }
 742         }
 743 }
 744
 745 static void presenter_screen_do_line(WINDOW *screen, struct flow_entry *n,
 746                                      unsigned int *line)
 747 {
 748         char tmp[128], *pname = NULL;
 749         uint16_t port;
 750
 751         mvwprintw(screen, *line, 2, "");
 752
 753         /* PID, application name */
 754         if (n->procnum > 0) {
 755                 slprintf(tmp, sizeof(tmp), "%s(%d)", basename(n->cmdline),
 756                          n->procnum);
 757
 758                 printw("[");
 759                 attron(COLOR_PAIR(3));
 760                 printw("%s", tmp);
 761                 attroff(COLOR_PAIR(3));
 762                 printw("]:");
 763         }
 764
 765         /* L3 protocol, L4 protocol, states */
 766         printw("%s:%s", l3proto2str[n->l3_proto], l4proto2str[n->l4_proto]);
 767         printw("[");
 768         attron(COLOR_PAIR(3));
 769         switch (n->l4_proto) {
 770         case IPPROTO_TCP:
 771                 printw("%s", tcp_state2str[n->tcp_state]);
 772                 break;
 773         case IPPROTO_SCTP:
 774                 printw("%s", sctp_state2str[n->sctp_state]);
 775                 break;
 776         case IPPROTO_DCCP:
 777                 printw("%s", dccp_state2str[n->dccp_state]);
 778                 break;
 779         case IPPROTO_UDP:
 780         case IPPROTO_UDPLITE:
 781         case IPPROTO_ICMP:
 782         case IPPROTO_ICMPV6:
 783                 printw("NOSTATE");
 784                 break;
 785         }
 786         attroff(COLOR_PAIR(3));
 787         printw("]");
 788
 789         /* Guess application port */
 790         switch (n->l4_proto) {
 791         case IPPROTO_TCP:
 792                 port = presenter_get_port(n->port_src, n->port_dst, 1);
 793                 pname = lookup_port_tcp(port);
 794                 break;
 795         case IPPROTO_UDP:
 796         case IPPROTO_UDPLITE:
 797                 port = presenter_get_port(n->port_src, n->port_dst, 0);
 798                 pname = lookup_port_udp(port);
 799                 break;
 800         }
 801         if (pname) {
 802                 attron(A_BOLD);
 803                 printw(":%s", pname);
 804                 attroff(A_BOLD);
 805         }
 806         printw(" ->");
 807
 808         /* Number packets, bytes */
 809         if (n->counter_pkts > 0 && n->counter_bytes > 0)
 810                 printw(" (%"PRIu64" pkts, %"PRIu64" bytes) ->",
 811                        n->counter_pkts, n->counter_bytes);
 812
 813         /* Show source information: reverse DNS, port, country, city */
 814         if (show_src) {
 815                 attron(COLOR_PAIR(1));
 816                 mvwprintw(screen, ++(*line), 8, "src: %s", n->rev_dns_src);
 817                 attroff(COLOR_PAIR(1));
 818
 819                 printw(":%"PRIu16, n->port_src);
 820
 821                 if (n->country_src[0]) {
 822                         printw(" (");
 823
 824                         attron(COLOR_PAIR(4));
 825                         printw("%s", n->country_src);
 826                         attroff(COLOR_PAIR(4));
 827
 828                         if (n->city_src[0])
 829                                 printw(", %s", n->city_src);
 830
 831                         printw(")");
 832                 }
 833
 834                 printw(" => ");
 835         }
 836
 837         /* Show dest information: reverse DNS, port, country, city */
 838         attron(COLOR_PAIR(2));
 839         mvwprintw(screen, ++(*line), 8, "dst: %s", n->rev_dns_dst);
 840         attroff(COLOR_PAIR(2));
 841
 842         printw(":%"PRIu16, n->port_dst);
 843
 844         if (n->country_dst[0]) {
 845                 printw(" (");
 846
 847                 attron(COLOR_PAIR(4));
 848                 printw("%s", n->country_dst);
 849                 attroff(COLOR_PAIR(4));
 850
 851                 if (n->city_dst[0])
 852                         printw(", %s", n->city_dst);
 853
 854                 printw(")");
 855         }
 856 }
 857
 858 static inline int presenter_flow_wrong_state(struct flow_entry *n, int state)
 859 {
 860         int ret = 1;
 861
 862         switch (n->l4_proto) {
 863         case IPPROTO_TCP:
 864                 if (n->tcp_state == state)
 865                         ret = 0;
 866                 break;
 867         case IPPROTO_SCTP:
 868                 if (n->sctp_state == state)
 869                         ret = 0;
 870                 break;
 871         case IPPROTO_DCCP:
 872                 if (n->dccp_state == state)
 873                         ret = 0;
 874                 break;
 875         case IPPROTO_UDP:
 876         case IPPROTO_UDPLITE:
 877         case IPPROTO_ICMP:
 878         case IPPROTO_ICMPV6:
 879                 ret = 0;
 880                 break;
 881         }
 882
 883         return ret;
 884 }
 885
 886 static void presenter_screen_update(WINDOW *screen, struct flow_list *fl,
 887                                     int skip_lines)
 888 {
 889         int maxy;
 890         size_t i, j;
 891         unsigned int line = 3;
 892         struct flow_entry *n;
 893         uint8_t protocols[] = {
 894                 IPPROTO_TCP,
 895                 IPPROTO_DCCP,
 896                 IPPROTO_SCTP,
 897                 IPPROTO_UDP,
 898                 IPPROTO_UDPLITE,
 899                 IPPROTO_ICMP,
 900                 IPPROTO_ICMPV6,
 901         };
 902         size_t protocol_state_size[] = {
 903                 [IPPROTO_TCP] = array_size(tcp_states),
 904                 [IPPROTO_DCCP] = array_size(dccp_states),
 905                 [IPPROTO_SCTP] = array_size(sctp_states),
 906                 [IPPROTO_UDP] = 1,
 907                 [IPPROTO_UDPLITE] = 1,
 908                 [IPPROTO_ICMP] = 1,
 909                 [IPPROTO_ICMPV6] = 1,
 910         };
 911
 912         curs_set(0);
 913
 914         maxy = getmaxy(screen);
 915         maxy -= 6;
 916
 917         start_color();
 918         init_pair(1, COLOR_RED, COLOR_BLACK);
 919         init_pair(2, COLOR_BLUE, COLOR_BLACK);
 920         init_pair(3, COLOR_YELLOW, COLOR_BLACK);
 921         init_pair(4, COLOR_GREEN, COLOR_BLACK);
 922
 923         wclear(screen);
 924         clear();
 925
 926         mvwprintw(screen, 1, 2, "Kernel netfilter flows for %s%s%s%s%s%s"
 927                   "[+%d]", what & INCLUDE_TCP ? "TCP, " : "" ,
 928                   what & INCLUDE_UDP ? "UDP, " : "",
 929                   what & INCLUDE_SCTP ? "SCTP, " : "",
 930                   what & INCLUDE_DCCP ? "DCCP, " : "",
 931                   what & INCLUDE_ICMP && what & INCLUDE_IPV4 ? "ICMP, " : "",
 932                   what & INCLUDE_ICMP && what & INCLUDE_IPV6 ? "ICMP6, " : "",
 933                   skip_lines);
 934
 935         rcu_read_lock();
 936
 937         if (rcu_dereference(fl->head) == NULL)
 938                 mvwprintw(screen, line, 2, "(No active sessions! "
 939                           "Is netfilter running?)");
 940
 941         for (i = 0; i < array_size(protocols); i++) {
 942                 for (j = 0; j < protocol_state_size[protocols[i]]; j++) {
 943                         n = rcu_dereference(fl->head);
 944                         while (n && maxy > 0) {
 945                                 int skip_entry = 0;
 946
 947                                 if (n->l4_proto != protocols[i])
 948                                         skip_entry = 1;
 949                                 if (presenter_flow_wrong_state(n, j))
 950                                         skip_entry = 1;
 951                                 if (presenter_get_port(n->port_src,
 952                                                        n->port_dst, 0) == 53)
 953                                         skip_entry = 1;
 954                                 if (skip_entry) {
 955                                         n = rcu_dereference(n->next);
 956                                         continue;
 957                                 }
 958                                 if (skip_lines > 0) {
 959                                         n = rcu_dereference(n->next);
 960                                         skip_lines--;
 961                                         continue;
 962                                 }
 963
 964                                 presenter_screen_do_line(screen, n, &line);
 965
 966                                 line++;
 967                                 maxy -= (2 + 1 * show_src);
 968                                 n = rcu_dereference(n->next);
 969                         }
 970                 }
 971         }
 972
 973         rcu_read_unlock();
 974
 975         wrefresh(screen);
 976         refresh();
 977 }
 978
 979 static void presenter(void)
 980 {
 981         int skip_lines = 0;
 982         WINDOW *screen;
 983
 984         dissector_init_ethernet(0);
 985         screen = screen_init(false);
 986
 987         rcu_register_thread();
 988         while (!sigint) {
 989                 switch (getch()) {
 990                 case 'q':
 991                         sigint = 1;
 992                         break;
 993                 case KEY_UP:
 994                 case 'u':
 995                 case 'k':
 996                         skip_lines--;
 997                         if (skip_lines < 0)
 998                                 skip_lines = 0;
 999                         break;
1000                 case KEY_DOWN:
1001                 case 'd':
1002                 case 'j':
1003                         skip_lines++;
1004                         if (skip_lines > SCROLL_MAX)
1005                                 skip_lines = SCROLL_MAX;
1006                         break;
1007                 default:
1008                         fflush(stdin);
1009                         break;
1010                 }
1011
1012                 presenter_screen_update(screen, &flow_list, skip_lines);
1013                 usleep(100000);
1014         }
1015         rcu_unregister_thread();
1016
1017         screen_end();
1018         dissector_cleanup_ethernet();
1019 }
1020
1021 static int collector_cb(enum nf_conntrack_msg_type type,
1022                         struct nf_conntrack *ct, void *data __maybe_unused)
1023 {
1024         if (sigint)
1025                 return NFCT_CB_STOP;
1026
1027         synchronize_rcu();
1028         spinlock_lock(&flow_list.lock);
1029
1030         switch (type) {
1031         case NFCT_T_NEW:
1032                 flow_list_new_entry(&flow_list, ct);
1033                 break;
1034         case NFCT_T_UPDATE:
1035                 flow_list_update_entry(&flow_list, ct);
1036                 break;
1037         case NFCT_T_DESTROY:
1038                 flow_list_destroy_entry(&flow_list, ct);
1039                 break;
1040         default:
1041                 break;
1042         }
1043
1044         spinlock_unlock(&flow_list.lock);
1045
1046         return NFCT_CB_CONTINUE;
1047 }
1048
1049 static inline void collector_flush(struct nfct_handle *handle, uint8_t family)
1050 {
1051         nfct_query(handle, NFCT_Q_FLUSH, &family);
1052 }
1053
1054 static void *collector(void *null __maybe_unused)
1055 {
1056         int ret;
1057         struct nfct_handle *handle;
1058         struct nfct_filter *filter;
1059
1060         handle = nfct_open(CONNTRACK, NF_NETLINK_CONNTRACK_NEW |
1061                                       NF_NETLINK_CONNTRACK_UPDATE |
1062                                       NF_NETLINK_CONNTRACK_DESTROY);
1063         if (!handle)
1064                 panic("Cannot create a nfct handle!\n");
1065
1066         collector_flush(handle, AF_INET);
1067         collector_flush(handle, AF_INET6);
1068
1069         filter = nfct_filter_create();
1070         if (!filter)
1071                 panic("Cannot create a nfct filter!\n");
1072
1073         ret = nfct_filter_attach(nfct_fd(handle), filter);
1074         if (ret < 0)
1075                 panic("Cannot attach filter to handle!\n");
1076
1077         if (what & INCLUDE_UDP) {
1078                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDP);
1079                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDPLITE);
1080         }
1081         if (what & INCLUDE_TCP)
1082                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_TCP);
1083         if (what & INCLUDE_DCCP)
1084                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_DCCP);
1085         if (what & INCLUDE_SCTP)
1086                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_SCTP);
1087         if (what & INCLUDE_ICMP && what & INCLUDE_IPV4)
1088                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMP);
1089         if (what & INCLUDE_ICMP && what & INCLUDE_IPV6)
1090                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMPV6);
1091         if (what & INCLUDE_IPV4) {
1092                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV4, NFCT_FILTER_LOGIC_NEGATIVE);
1093                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV4, &filter_ipv4);
1094         }
1095         if (what & INCLUDE_IPV6) {
1096                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV6, NFCT_FILTER_LOGIC_NEGATIVE);
1097                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV6, &filter_ipv6);
1098         }
1099
1100         ret = nfct_filter_attach(nfct_fd(handle), filter);
1101         if (ret < 0)
1102                 panic("Cannot attach filter to handle!\n");
1103
1104         nfct_callback_register(handle, NFCT_T_ALL, collector_cb, NULL);
1105         nfct_filter_destroy(filter);
1106         flow_list_init(&flow_list);
1107
1108         rcu_register_thread();
1109
1110         while (!sigint && ret >= 0)
1111                 ret = nfct_catch(handle);
1112
1113         rcu_unregister_thread();
1114
1115         flow_list_destroy(&flow_list);
1116         nfct_close(handle);
1117
1118         pthread_exit(NULL);
1119 }
1120
1121 int main(int argc, char **argv)
1122 {
1123         pthread_t tid;
1124         int ret, c, opt_index, what_cmd = 0;
1125
1126         setfsuid(getuid());
1127         setfsgid(getgid());
1128
1129         while ((c = getopt_long(argc, argv, short_options, long_options,
1130                &opt_index)) != EOF) {
1131                 switch (c) {
1132                 case '4':
1133                         what_cmd |= INCLUDE_IPV4;
1134                         break;
1135                 case '6':
1136                         what_cmd |= INCLUDE_IPV6;
1137                         break;
1138                 case 'T':
1139                         what_cmd |= INCLUDE_TCP;
1140                         break;
1141                 case 'U':
1142                         what_cmd |= INCLUDE_UDP;
1143                         break;
1144                 case 'D':
1145                         what_cmd |= INCLUDE_DCCP;
1146                         break;
1147                 case 'I':
1148                         what_cmd |= INCLUDE_ICMP;
1149                         break;
1150                 case 'S':
1151                         what_cmd |= INCLUDE_SCTP;
1152                         break;
1153                 case 's':
1154                         show_src = 1;
1155                         break;
1156                 case 'u':
1157                         update_geoip();
1158                         die();
1159                         break;
1160                 case 'h':
1161                         help();
1162                         break;
1163                 case 'v':
1164                         version();
1165                         break;
1166                 default:
1167                         break;
1168                 }
1169         }
1170
1171         if (what_cmd > 0)
1172                 what = what_cmd;
1173
1174         rcu_init();
1175
1176         register_signal(SIGINT, signal_handler);
1177         register_signal(SIGQUIT, signal_handler);
1178         register_signal(SIGTERM, signal_handler);
1179         register_signal(SIGHUP, signal_handler);
1180
1181         init_geoip(1);
1182
1183         ret = pthread_create(&tid, NULL, collector, NULL);
1184         if (ret < 0)
1185                 panic("Cannot create phthread!\n");
1186
1187         presenter();
1188
1189         destroy_geoip();
1190
1191         return 0;
1192 }