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