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 "config.h"
  31 #include "str.h"
  32 #include "sig.h"
  33 #include "lookup.h"
  34 #include "geoip.h"
  35 #include "built_in.h"
  36 #include "locking.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 inode;
  55         unsigned int procnum;
  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 *copyright = "Please report bugs to <bugs@netsniff-ng.org>\n"
 101         "Copyright (C) 2011-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
 102         "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
 103         "Swiss federal institute of technology (ETH Zurich)\n"
 104         "License: GNU GPL version 2.0\n"
 105         "This is free software: you are free to change and redistribute it.\n"
 106         "There is NO WARRANTY, to the extent permitted by law.";
 107
 108 static const char *const l3proto2str[AF_MAX] = {
 109         [AF_INET]                       = "ipv4",
 110         [AF_INET6]                      = "ipv6",
 111 };
 112
 113 static const char *const l4proto2str[IPPROTO_MAX] = {
 114         [IPPROTO_TCP]                   = "tcp",
 115         [IPPROTO_UDP]                   = "udp",
 116         [IPPROTO_UDPLITE]               = "udplite",
 117         [IPPROTO_ICMP]                  = "icmp",
 118         [IPPROTO_ICMPV6]                = "icmpv6",
 119         [IPPROTO_SCTP]                  = "sctp",
 120         [IPPROTO_GRE]                   = "gre",
 121         [IPPROTO_DCCP]                  = "dccp",
 122         [IPPROTO_IGMP]                  = "igmp",
 123         [IPPROTO_IPIP]                  = "ipip",
 124         [IPPROTO_EGP]                   = "egp",
 125         [IPPROTO_PUP]                   = "pup",
 126         [IPPROTO_IDP]                   = "idp",
 127         [IPPROTO_RSVP]                  = "rsvp",
 128         [IPPROTO_IPV6]                  = "ip6tun",
 129         [IPPROTO_ESP]                   = "esp",
 130         [IPPROTO_AH]                    = "ah",
 131         [IPPROTO_PIM]                   = "pim",
 132         [IPPROTO_COMP]                  = "comp",
 133 };
 134
 135 static const char *const tcp_state2str[TCP_CONNTRACK_MAX] = {
 136         [TCP_CONNTRACK_NONE]            = "NOSTATE",
 137         [TCP_CONNTRACK_SYN_SENT]        = "SYN_SENT",
 138         [TCP_CONNTRACK_SYN_RECV]        = "SYN_RECV",
 139         [TCP_CONNTRACK_ESTABLISHED]     = "ESTABLISHED",
 140         [TCP_CONNTRACK_FIN_WAIT]        = "FIN_WAIT",
 141         [TCP_CONNTRACK_CLOSE_WAIT]      = "CLOSE_WAIT",
 142         [TCP_CONNTRACK_LAST_ACK]        = "LAST_ACK",
 143         [TCP_CONNTRACK_TIME_WAIT]       = "TIME_WAIT",
 144         [TCP_CONNTRACK_CLOSE]           = "CLOSE",
 145         [TCP_CONNTRACK_SYN_SENT2]       = "SYN_SENT2",
 146 };
 147
 148 static const uint8_t tcp_states[] = {
 149         TCP_CONNTRACK_SYN_SENT,
 150         TCP_CONNTRACK_SYN_RECV,
 151         TCP_CONNTRACK_ESTABLISHED,
 152         TCP_CONNTRACK_FIN_WAIT,
 153         TCP_CONNTRACK_CLOSE_WAIT,
 154         TCP_CONNTRACK_LAST_ACK,
 155         TCP_CONNTRACK_TIME_WAIT,
 156         TCP_CONNTRACK_CLOSE,
 157         TCP_CONNTRACK_SYN_SENT2,
 158         TCP_CONNTRACK_NONE,
 159 };
 160
 161 static const char *const dccp_state2str[DCCP_CONNTRACK_MAX] = {
 162         [DCCP_CONNTRACK_NONE]           = "NOSTATE",
 163         [DCCP_CONNTRACK_REQUEST]        = "REQUEST",
 164         [DCCP_CONNTRACK_RESPOND]        = "RESPOND",
 165         [DCCP_CONNTRACK_PARTOPEN]       = "PARTOPEN",
 166         [DCCP_CONNTRACK_OPEN]           = "OPEN",
 167         [DCCP_CONNTRACK_CLOSEREQ]       = "CLOSEREQ",
 168         [DCCP_CONNTRACK_CLOSING]        = "CLOSING",
 169         [DCCP_CONNTRACK_TIMEWAIT]       = "TIMEWAIT",
 170         [DCCP_CONNTRACK_IGNORE]         = "IGNORE",
 171         [DCCP_CONNTRACK_INVALID]        = "INVALID",
 172 };
 173
 174 static const uint8_t dccp_states[] = {
 175         DCCP_CONNTRACK_NONE,
 176         DCCP_CONNTRACK_REQUEST,
 177         DCCP_CONNTRACK_RESPOND,
 178         DCCP_CONNTRACK_PARTOPEN,
 179         DCCP_CONNTRACK_OPEN,
 180         DCCP_CONNTRACK_CLOSEREQ,
 181         DCCP_CONNTRACK_CLOSING,
 182         DCCP_CONNTRACK_TIMEWAIT,
 183         DCCP_CONNTRACK_IGNORE,
 184         DCCP_CONNTRACK_INVALID,
 185 };
 186
 187 static const char *const sctp_state2str[SCTP_CONNTRACK_MAX] = {
 188         [SCTP_CONNTRACK_NONE]           = "NOSTATE",
 189         [SCTP_CONNTRACK_CLOSED]         = "CLOSED",
 190         [SCTP_CONNTRACK_COOKIE_WAIT]    = "COOKIE_WAIT",
 191         [SCTP_CONNTRACK_COOKIE_ECHOED]  = "COOKIE_ECHOED",
 192         [SCTP_CONNTRACK_ESTABLISHED]    = "ESTABLISHED",
 193         [SCTP_CONNTRACK_SHUTDOWN_SENT]  = "SHUTDOWN_SENT",
 194         [SCTP_CONNTRACK_SHUTDOWN_RECD]  = "SHUTDOWN_RECD",
 195         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = "SHUTDOWN_ACK_SENT",
 196 };
 197
 198 static const uint8_t sctp_states[] = {
 199         SCTP_CONNTRACK_NONE,
 200         SCTP_CONNTRACK_CLOSED,
 201         SCTP_CONNTRACK_COOKIE_WAIT,
 202         SCTP_CONNTRACK_COOKIE_ECHOED,
 203         SCTP_CONNTRACK_ESTABLISHED,
 204         SCTP_CONNTRACK_SHUTDOWN_SENT,
 205         SCTP_CONNTRACK_SHUTDOWN_RECD,
 206         SCTP_CONNTRACK_SHUTDOWN_ACK_SENT,
 207 };
 208
 209 static const struct nfct_filter_ipv4 filter_ipv4 = {
 210         .addr = __constant_htonl(INADDR_LOOPBACK),
 211         .mask = 0xffffffff,
 212 };
 213
 214 static const struct nfct_filter_ipv6 filter_ipv6 = {
 215         .addr = { 0x0, 0x0, 0x0, 0x1 },
 216         .mask = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff },
 217 };
 218
 219 static void signal_handler(int number)
 220 {
 221         switch (number) {
 222         case SIGINT:
 223         case SIGQUIT:
 224         case SIGTERM:
 225                 sigint = 1;
 226                 break;
 227         case SIGHUP:
 228         default:
 229                 break;
 230         }
 231 }
 232
 233 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct);
 234 static void flow_entry_get_extended(struct flow_entry *n);
 235
 236 static void help(void)
 237 {
 238         printf("flowtop %s, top-like netfilter TCP/UDP/SCTP/.. flow tracking\n",
 239                VERSION_STRING);
 240         puts("http://www.netsniff-ng.org\n\n"
 241              "Usage: flowtop [options]\n"
 242              "Options:\n"
 243              "  -4|--ipv4              Show only IPv4 flows (default)\n"
 244              "  -6|--ipv6              Show only IPv6 flows (default)\n"
 245              "  -T|--tcp               Show only TCP flows (default)\n"
 246              "  -U|--udp               Show only UDP flows\n"
 247              "  -D|--dccp              Show only DCCP flows\n"
 248              "  -I|--icmp              Show only ICMP/ICMPv6 flows\n"
 249              "  -S|--sctp              Show only SCTP flows\n"
 250              "  -s|--show-src          Also show source, not only dest\n"
 251              "  -u|--update            Update GeoIP databases\n"
 252              "  -v|--version           Print version and exit\n"
 253              "  -h|--help              Print this help and exit\n\n"
 254              "Examples:\n"
 255              "  flowtop\n"
 256              "  flowtop -46UTDISs\n\n"
 257              "Note:\n"
 258              "  If netfilter is not running, you can activate it with e.g.:\n"
 259              "   iptables -A INPUT -p tcp -m state --state ESTABLISHED -j ACCEPT\n"
 260              "   iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT\n");
 261         puts(copyright);
 262         die();
 263 }
 264
 265 static void version(void)
 266 {
 267         printf("flowtop %s, Git id: %s\n", VERSION_LONG, GITVERSION);
 268         puts("top-like netfilter TCP/UDP/SCTP/.. flow tracking\n"
 269              "http://www.netsniff-ng.org\n");
 270         puts(copyright);
 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(unsigned int pid, 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/%u/fd", pid) == -1)
 400                 panic("giant process name! %u\n", pid);
 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/%u/fd/%s",
 410                              pid, ent->d_name) < 0)
 411                         continue;
 412
 413                 if (stat(path, &statbuf) < 0)
 414                         continue;
 415
 416                 if (S_ISSOCK(statbuf.st_mode) && (ino_t) n->inode == statbuf.st_ino) {
 417                         memset(n->cmdline, 0, sizeof(n->cmdline));
 418
 419                         snprintf(path, sizeof(path), "/proc/%u/exe", pid);
 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 = pid;
 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                 const char *name = ent->d_name;
 454                 char *end;
 455                 unsigned int pid = strtoul(name, &end, 10);
 456
 457                 /* not a PID */
 458                 if (pid == 0 && end == name)
 459                         continue;
 460
 461                 ret = walk_process(pid, n);
 462                 if (ret > 0)
 463                         break;
 464         }
 465
 466         closedir(dir);
 467 }
 468
 469 static int get_port_inode(uint16_t port, int proto, int is_ip6)
 470 {
 471         int ret = -ENOENT;
 472         char path[128], buff[1024];
 473         FILE *proc;
 474
 475         memset(path, 0, sizeof(path));
 476         snprintf(path, sizeof(path), "/proc/net/%s%s",
 477                  l4proto2str[proto], is_ip6 ? "6" : "");
 478
 479         proc = fopen(path, "r");
 480         if (!proc)
 481                 return -EIO;
 482
 483         memset(buff, 0, sizeof(buff));
 484
 485         while (fgets(buff, sizeof(buff), proc) != NULL) {
 486                 int inode = 0;
 487                 unsigned int lport = 0;
 488
 489                 buff[sizeof(buff) - 1] = 0;
 490                 if (sscanf(buff, "%*u: %*X:%X %*X:%*X %*X %*X:%*X %*X:%*X "
 491                            "%*X %*u %*u %u", &lport, &inode) == 2) {
 492                         if ((uint16_t) lport == port) {
 493                                 ret = inode;
 494                                 break;
 495                         }
 496                 }
 497
 498                 memset(buff, 0, sizeof(buff));
 499         }
 500
 501         fclose(proc);
 502         return ret;
 503 }
 504
 505 #define CP_NFCT(elem, attr, x)                          \
 506         do { n->elem = nfct_get_attr_u##x(ct,(attr)); } while (0)
 507 #define CP_NFCT_BUFF(elem, attr) do {                   \
 508         const uint8_t *buff = nfct_get_attr(ct,(attr)); \
 509         if (buff != NULL)                               \
 510                 memcpy(n->elem, buff, sizeof(n->elem)); \
 511 } while (0)
 512
 513 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct)
 514 {
 515         CP_NFCT(l3_proto, ATTR_ORIG_L3PROTO, 8);
 516         CP_NFCT(l4_proto, ATTR_ORIG_L4PROTO, 8);
 517
 518         CP_NFCT(ip4_src_addr, ATTR_ORIG_IPV4_SRC, 32);
 519         CP_NFCT(ip4_dst_addr, ATTR_ORIG_IPV4_DST, 32);
 520
 521         CP_NFCT(port_src, ATTR_ORIG_PORT_SRC, 16);
 522         CP_NFCT(port_dst, ATTR_ORIG_PORT_DST, 16);
 523
 524         CP_NFCT(status, ATTR_STATUS, 32);
 525
 526         CP_NFCT(tcp_state, ATTR_TCP_STATE, 8);
 527         CP_NFCT(tcp_flags, ATTR_TCP_FLAGS_ORIG, 8);
 528         CP_NFCT(sctp_state, ATTR_SCTP_STATE, 8);
 529         CP_NFCT(dccp_state, ATTR_DCCP_STATE, 8);
 530
 531         CP_NFCT(counter_pkts, ATTR_ORIG_COUNTER_PACKETS, 64);
 532         CP_NFCT(counter_bytes, ATTR_ORIG_COUNTER_BYTES, 64);
 533
 534         CP_NFCT(timestamp_start, ATTR_TIMESTAMP_START, 64);
 535         CP_NFCT(timestamp_stop, ATTR_TIMESTAMP_STOP, 64);
 536
 537         CP_NFCT(flow_id, ATTR_ID, 32);
 538         CP_NFCT(use, ATTR_USE, 32);
 539
 540         CP_NFCT_BUFF(ip6_src_addr, ATTR_ORIG_IPV6_SRC);
 541         CP_NFCT_BUFF(ip6_dst_addr, ATTR_ORIG_IPV6_DST);
 542
 543         n->port_src = ntohs(n->port_src);
 544         n->port_dst = ntohs(n->port_dst);
 545
 546         n->ip4_src_addr = ntohl(n->ip4_src_addr);
 547         n->ip4_dst_addr = ntohl(n->ip4_dst_addr);
 548 }
 549
 550 enum flow_entry_direction {
 551         flow_entry_src,
 552         flow_entry_dst,
 553 };
 554
 555 static inline int flow_entry_get_extended_is_dns(struct flow_entry *n)
 556 {
 557         /* We don't want to analyze / display DNS itself, since we
 558          * use it to resolve reverse dns.
 559          */
 560         return n->port_src == 53 || n->port_dst == 53;
 561 }
 562
 563 #define SELFLD(dir,src_member,dst_member)       \
 564         (((dir) == flow_entry_src) ? n->src_member : n->dst_member)
 565
 566 static void flow_entry_get_sain4_obj(struct flow_entry *n,
 567                                      enum flow_entry_direction dir,
 568                                      struct sockaddr_in *sa)
 569 {
 570         memset(sa, 0, sizeof(*sa));
 571         sa->sin_family = PF_INET;
 572         sa->sin_addr.s_addr = htonl(SELFLD(dir, ip4_src_addr, ip4_dst_addr));
 573 }
 574
 575 static void flow_entry_get_sain6_obj(struct flow_entry *n,
 576                                      enum flow_entry_direction dir,
 577                                      struct sockaddr_in6 *sa)
 578 {
 579         memset(sa, 0, sizeof(*sa));
 580         sa->sin6_family = PF_INET6;
 581
 582         memcpy(&sa->sin6_addr, SELFLD(dir, ip6_src_addr, ip6_dst_addr),
 583                sizeof(sa->sin6_addr));
 584 }
 585
 586 static void
 587 flow_entry_geo_city_lookup_generic(struct flow_entry *n,
 588                                    enum flow_entry_direction dir)
 589 {
 590         struct sockaddr_in sa4;
 591         struct sockaddr_in6 sa6;
 592         const char *city = NULL;
 593
 594         switch (n->l3_proto) {
 595         default:
 596                 bug();
 597
 598         case AF_INET:
 599                 flow_entry_get_sain4_obj(n, dir, &sa4);
 600                 city = geoip4_city_name(&sa4);
 601                 break;
 602
 603         case AF_INET6:
 604                 flow_entry_get_sain6_obj(n, dir, &sa6);
 605                 city = geoip6_city_name(&sa6);
 606                 break;
 607         }
 608
 609         bug_on(sizeof(n->city_src) != sizeof(n->city_dst));
 610
 611         if (city) {
 612                 memcpy(SELFLD(dir, city_src, city_dst), city,
 613                        min(sizeof(n->city_src), strlen(city)));
 614         } else {
 615                 memset(SELFLD(dir, city_src, city_dst), 0,
 616                        sizeof(n->city_src));
 617         }
 618 }
 619
 620 static void
 621 flow_entry_geo_country_lookup_generic(struct flow_entry *n,
 622                                       enum flow_entry_direction dir)
 623 {
 624         struct sockaddr_in sa4;
 625         struct sockaddr_in6 sa6;
 626         const char *country = NULL;
 627
 628         switch (n->l3_proto) {
 629         default:
 630                 bug();
 631
 632         case AF_INET:
 633                 flow_entry_get_sain4_obj(n, dir, &sa4);
 634                 country = geoip4_country_name(&sa4);
 635                 break;
 636
 637         case AF_INET6:
 638                 flow_entry_get_sain6_obj(n, dir, &sa6);
 639                 country = geoip6_country_name(&sa6);
 640                 break;
 641         }
 642
 643         bug_on(sizeof(n->country_src) != sizeof(n->country_dst));
 644
 645         if (country) {
 646                 memcpy(SELFLD(dir, country_src, country_dst), country,
 647                        min(sizeof(n->country_src), strlen(country)));
 648         } else {
 649                 memset(SELFLD(dir, country_src, country_dst), 0,
 650                        sizeof(n->country_src));
 651         }
 652 }
 653
 654 static void flow_entry_get_extended_geo(struct flow_entry *n,
 655                                         enum flow_entry_direction dir)
 656 {
 657         flow_entry_geo_city_lookup_generic(n, dir);
 658         flow_entry_geo_country_lookup_generic(n, dir);
 659 }
 660
 661 static void flow_entry_get_extended_revdns(struct flow_entry *n,
 662                                            enum flow_entry_direction dir)
 663 {
 664         size_t sa_len;
 665         struct sockaddr_in sa4;
 666         struct sockaddr_in6 sa6;
 667         struct sockaddr *sa;
 668         struct hostent *hent;
 669
 670         switch (n->l3_proto) {
 671         default:
 672                 bug();
 673
 674         case AF_INET:
 675                 flow_entry_get_sain4_obj(n, dir, &sa4);
 676                 sa = (struct sockaddr *) &sa4;
 677                 sa_len = sizeof(sa4);
 678                 hent = gethostbyaddr(&sa4.sin_addr, sizeof(sa4.sin_addr), AF_INET);
 679                 break;
 680
 681         case AF_INET6:
 682                 flow_entry_get_sain6_obj(n, dir, &sa6);
 683                 sa = (struct sockaddr *) &sa6;
 684                 sa_len = sizeof(sa6);
 685                 hent = gethostbyaddr(&sa6.sin6_addr, sizeof(sa6.sin6_addr), AF_INET6);
 686                 break;
 687         }
 688
 689         bug_on(sizeof(n->rev_dns_src) != sizeof(n->rev_dns_dst));
 690         getnameinfo(sa, sa_len, SELFLD(dir, rev_dns_src, rev_dns_dst),
 691                     sizeof(n->rev_dns_src), NULL, 0, NI_NUMERICHOST);
 692
 693         if (hent) {
 694                 memset(n->rev_dns_dst, 0, sizeof(n->rev_dns_dst));
 695                 memcpy(SELFLD(dir, rev_dns_src, rev_dns_dst),
 696                        hent->h_name, min(sizeof(n->rev_dns_src),
 697                                          strlen(hent->h_name)));
 698         }
 699 }
 700
 701 static void flow_entry_get_extended(struct flow_entry *n)
 702 {
 703         if (n->flow_id == 0 || flow_entry_get_extended_is_dns(n))
 704                 return;
 705
 706         flow_entry_get_extended_revdns(n, flow_entry_src);
 707         flow_entry_get_extended_geo(n, flow_entry_src);
 708
 709         flow_entry_get_extended_revdns(n, flow_entry_dst);
 710         flow_entry_get_extended_geo(n, flow_entry_dst);
 711
 712         /* Lookup application */
 713         n->inode = get_port_inode(n->port_src, n->l4_proto,
 714                                   n->l3_proto == AF_INET6);
 715         if (n->inode > 0)
 716                 walk_processes(n);
 717 }
 718
 719 static uint16_t presenter_get_port(uint16_t src, uint16_t dst, int tcp)
 720 {
 721         if (src < dst && src < 1024) {
 722                 return src;
 723         } else if (dst < src && dst < 1024) {
 724                 return dst;
 725         } else {
 726                 const char *tmp1, *tmp2;
 727                 if (tcp) {
 728                         tmp1 = lookup_port_tcp(src);
 729                         tmp2 = lookup_port_tcp(dst);
 730                 } else {
 731                         tmp1 = lookup_port_udp(src);
 732                         tmp2 = lookup_port_udp(dst);
 733                 }
 734                 if (tmp1 && !tmp2) {
 735                         return src;
 736                 } else if (!tmp1 && tmp2) {
 737                         return dst;
 738                 } else {
 739                         if (src < dst)
 740                                 return src;
 741                         else
 742                                 return dst;
 743                 }
 744         }
 745 }
 746
 747 static void presenter_screen_do_line(WINDOW *screen, struct flow_entry *n,
 748                                      unsigned int *line)
 749 {
 750         char tmp[128], *pname = NULL;
 751         uint16_t port;
 752
 753         mvwprintw(screen, *line, 2, "");
 754
 755         /* PID, application name */
 756         if (n->procnum > 0) {
 757                 slprintf(tmp, sizeof(tmp), "%s(%d)", basename(n->cmdline),
 758                          n->procnum);
 759
 760                 printw("[");
 761                 attron(COLOR_PAIR(3));
 762                 printw("%s", tmp);
 763                 attroff(COLOR_PAIR(3));
 764                 printw("]:");
 765         }
 766
 767         /* L3 protocol, L4 protocol, states */
 768         printw("%s:%s", l3proto2str[n->l3_proto], l4proto2str[n->l4_proto]);
 769         printw("[");
 770         attron(COLOR_PAIR(3));
 771         switch (n->l4_proto) {
 772         case IPPROTO_TCP:
 773                 printw("%s", tcp_state2str[n->tcp_state]);
 774                 break;
 775         case IPPROTO_SCTP:
 776                 printw("%s", sctp_state2str[n->sctp_state]);
 777                 break;
 778         case IPPROTO_DCCP:
 779                 printw("%s", dccp_state2str[n->dccp_state]);
 780                 break;
 781         case IPPROTO_UDP:
 782         case IPPROTO_UDPLITE:
 783         case IPPROTO_ICMP:
 784         case IPPROTO_ICMPV6:
 785                 printw("NOSTATE");
 786                 break;
 787         }
 788         attroff(COLOR_PAIR(3));
 789         printw("]");
 790
 791         /* Guess application port */
 792         switch (n->l4_proto) {
 793         case IPPROTO_TCP:
 794                 port = presenter_get_port(n->port_src, n->port_dst, 1);
 795                 pname = lookup_port_tcp(port);
 796                 break;
 797         case IPPROTO_UDP:
 798         case IPPROTO_UDPLITE:
 799                 port = presenter_get_port(n->port_src, n->port_dst, 0);
 800                 pname = lookup_port_udp(port);
 801                 break;
 802         }
 803         if (pname) {
 804                 attron(A_BOLD);
 805                 printw(":%s", pname);
 806                 attroff(A_BOLD);
 807         }
 808         printw(" ->");
 809
 810         /* Number packets, bytes */
 811         if (n->counter_pkts > 0 && n->counter_bytes > 0)
 812                 printw(" (%"PRIu64" pkts, %"PRIu64" bytes) ->",
 813                        n->counter_pkts, n->counter_bytes);
 814
 815         /* Show source information: reverse DNS, port, country, city */
 816         if (show_src) {
 817                 attron(COLOR_PAIR(1));
 818                 mvwprintw(screen, ++(*line), 8, "src: %s", n->rev_dns_src);
 819                 attroff(COLOR_PAIR(1));
 820
 821                 printw(":%"PRIu16, n->port_src);
 822
 823                 if (n->country_src[0]) {
 824                         printw(" (");
 825
 826                         attron(COLOR_PAIR(4));
 827                         printw("%s", n->country_src);
 828                         attroff(COLOR_PAIR(4));
 829
 830                         if (n->city_src[0])
 831                                 printw(", %s", n->city_src);
 832
 833                         printw(")");
 834                 }
 835
 836                 printw(" => ");
 837         }
 838
 839         /* Show dest information: reverse DNS, port, country, city */
 840         attron(COLOR_PAIR(2));
 841         mvwprintw(screen, ++(*line), 8, "dst: %s", n->rev_dns_dst);
 842         attroff(COLOR_PAIR(2));
 843
 844         printw(":%"PRIu16, n->port_dst);
 845
 846         if (n->country_dst[0]) {
 847                 printw(" (");
 848
 849                 attron(COLOR_PAIR(4));
 850                 printw("%s", n->country_dst);
 851                 attroff(COLOR_PAIR(4));
 852
 853                 if (n->city_dst[0])
 854                         printw(", %s", n->city_dst);
 855
 856                 printw(")");
 857         }
 858 }
 859
 860 static inline int presenter_flow_wrong_state(struct flow_entry *n, int state)
 861 {
 862         int ret = 1;
 863
 864         switch (n->l4_proto) {
 865         case IPPROTO_TCP:
 866                 if (n->tcp_state == state)
 867                         ret = 0;
 868                 break;
 869         case IPPROTO_SCTP:
 870                 if (n->sctp_state == state)
 871                         ret = 0;
 872                 break;
 873         case IPPROTO_DCCP:
 874                 if (n->dccp_state == state)
 875                         ret = 0;
 876                 break;
 877         case IPPROTO_UDP:
 878         case IPPROTO_UDPLITE:
 879         case IPPROTO_ICMP:
 880         case IPPROTO_ICMPV6:
 881                 ret = 0;
 882                 break;
 883         }
 884
 885         return ret;
 886 }
 887
 888 static void presenter_screen_update(WINDOW *screen, struct flow_list *fl,
 889                                     int skip_lines)
 890 {
 891         int maxy;
 892         size_t i, j;
 893         unsigned int line = 3;
 894         struct flow_entry *n;
 895         uint8_t protocols[] = {
 896                 IPPROTO_TCP,
 897                 IPPROTO_DCCP,
 898                 IPPROTO_SCTP,
 899                 IPPROTO_UDP,
 900                 IPPROTO_UDPLITE,
 901                 IPPROTO_ICMP,
 902                 IPPROTO_ICMPV6,
 903         };
 904         size_t protocol_state_size[] = {
 905                 [IPPROTO_TCP] = array_size(tcp_states),
 906                 [IPPROTO_DCCP] = array_size(dccp_states),
 907                 [IPPROTO_SCTP] = array_size(sctp_states),
 908                 [IPPROTO_UDP] = 1,
 909                 [IPPROTO_UDPLITE] = 1,
 910                 [IPPROTO_ICMP] = 1,
 911                 [IPPROTO_ICMPV6] = 1,
 912         };
 913
 914         curs_set(0);
 915
 916         maxy = getmaxy(screen);
 917         maxy -= 6;
 918
 919         start_color();
 920         init_pair(1, COLOR_RED, COLOR_BLACK);
 921         init_pair(2, COLOR_BLUE, COLOR_BLACK);
 922         init_pair(3, COLOR_YELLOW, COLOR_BLACK);
 923         init_pair(4, COLOR_GREEN, COLOR_BLACK);
 924
 925         wclear(screen);
 926         clear();
 927
 928         mvwprintw(screen, 1, 2, "Kernel netfilter flows for %s%s%s%s%s%s"
 929                   "[+%d]", what & INCLUDE_TCP ? "TCP, " : "" ,
 930                   what & INCLUDE_UDP ? "UDP, " : "",
 931                   what & INCLUDE_SCTP ? "SCTP, " : "",
 932                   what & INCLUDE_DCCP ? "DCCP, " : "",
 933                   what & INCLUDE_ICMP && what & INCLUDE_IPV4 ? "ICMP, " : "",
 934                   what & INCLUDE_ICMP && what & INCLUDE_IPV6 ? "ICMP6, " : "",
 935                   skip_lines);
 936
 937         rcu_read_lock();
 938
 939         if (rcu_dereference(fl->head) == NULL)
 940                 mvwprintw(screen, line, 2, "(No active sessions! "
 941                           "Is netfilter running?)");
 942
 943         for (i = 0; i < array_size(protocols); i++) {
 944                 for (j = 0; j < protocol_state_size[protocols[i]]; j++) {
 945                         n = rcu_dereference(fl->head);
 946                         while (n && maxy > 0) {
 947                                 if (n->l4_proto != protocols[i] ||
 948                                     presenter_flow_wrong_state(n, j) ||
 949                                     presenter_get_port(n->port_src,
 950                                                        n->port_dst, 0) == 53) {
 951                                         /* 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         lookup_init_ports(PORTS_TCP);
 982         lookup_init_ports(PORTS_UDP);
 983         screen = screen_init(false);
 984
 985         rcu_register_thread();
 986         while (!sigint) {
 987                 switch (getch()) {
 988                 case 'q':
 989                         sigint = 1;
 990                         break;
 991                 case KEY_UP:
 992                 case 'u':
 993                 case 'k':
 994                         skip_lines--;
 995                         if (skip_lines < 0)
 996                                 skip_lines = 0;
 997                         break;
 998                 case KEY_DOWN:
 999                 case 'd':
1000                 case 'j':
1001                         skip_lines++;
1002                         if (skip_lines > SCROLL_MAX)
1003                                 skip_lines = SCROLL_MAX;
1004                         break;
1005                 default:
1006                         fflush(stdin);
1007                         break;
1008                 }
1009
1010                 presenter_screen_update(screen, &flow_list, skip_lines);
1011                 usleep(100000);
1012         }
1013         rcu_unregister_thread();
1014
1015         screen_end();
1016         lookup_cleanup_ports(PORTS_UDP);
1017         lookup_cleanup_ports(PORTS_TCP);
1018 }
1019
1020 static int collector_cb(enum nf_conntrack_msg_type type,
1021                         struct nf_conntrack *ct, void *data __maybe_unused)
1022 {
1023         if (sigint)
1024                 return NFCT_CB_STOP;
1025
1026         synchronize_rcu();
1027         spinlock_lock(&flow_list.lock);
1028
1029         switch (type) {
1030         case NFCT_T_NEW:
1031                 flow_list_new_entry(&flow_list, ct);
1032                 break;
1033         case NFCT_T_UPDATE:
1034                 flow_list_update_entry(&flow_list, ct);
1035                 break;
1036         case NFCT_T_DESTROY:
1037                 flow_list_destroy_entry(&flow_list, ct);
1038                 break;
1039         default:
1040                 break;
1041         }
1042
1043         spinlock_unlock(&flow_list.lock);
1044
1045         return NFCT_CB_CONTINUE;
1046 }
1047
1048 static inline void collector_flush(struct nfct_handle *handle, uint8_t family)
1049 {
1050         nfct_query(handle, NFCT_Q_FLUSH, &family);
1051 }
1052
1053 static void *collector(void *null __maybe_unused)
1054 {
1055         int ret;
1056         struct nfct_handle *handle;
1057         struct nfct_filter *filter;
1058
1059         handle = nfct_open(CONNTRACK, NF_NETLINK_CONNTRACK_NEW |
1060                                       NF_NETLINK_CONNTRACK_UPDATE |
1061                                       NF_NETLINK_CONNTRACK_DESTROY);
1062         if (!handle)
1063                 panic("Cannot create a nfct handle!\n");
1064
1065         collector_flush(handle, AF_INET);
1066         collector_flush(handle, AF_INET6);
1067
1068         filter = nfct_filter_create();
1069         if (!filter)
1070                 panic("Cannot create a nfct filter!\n");
1071
1072         ret = nfct_filter_attach(nfct_fd(handle), filter);
1073         if (ret < 0)
1074                 panic("Cannot attach filter to handle!\n");
1075
1076         if (what & INCLUDE_UDP) {
1077                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDP);
1078                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDPLITE);
1079         }
1080         if (what & INCLUDE_TCP)
1081                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_TCP);
1082         if (what & INCLUDE_DCCP)
1083                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_DCCP);
1084         if (what & INCLUDE_SCTP)
1085                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_SCTP);
1086         if (what & INCLUDE_ICMP && what & INCLUDE_IPV4)
1087                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMP);
1088         if (what & INCLUDE_ICMP && what & INCLUDE_IPV6)
1089                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMPV6);
1090         if (what & INCLUDE_IPV4) {
1091                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV4, NFCT_FILTER_LOGIC_NEGATIVE);
1092                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV4, &filter_ipv4);
1093         }
1094         if (what & INCLUDE_IPV6) {
1095                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV6, NFCT_FILTER_LOGIC_NEGATIVE);
1096                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV6, &filter_ipv6);
1097         }
1098
1099         ret = nfct_filter_attach(nfct_fd(handle), filter);
1100         if (ret < 0)
1101                 panic("Cannot attach filter to handle!\n");
1102
1103         nfct_callback_register(handle, NFCT_T_ALL, collector_cb, NULL);
1104         nfct_filter_destroy(filter);
1105         flow_list_init(&flow_list);
1106
1107         rcu_register_thread();
1108
1109         while (!sigint && ret >= 0)
1110                 ret = nfct_catch(handle);
1111
1112         rcu_unregister_thread();
1113
1114         flow_list_destroy(&flow_list);
1115         nfct_close(handle);
1116
1117         pthread_exit(NULL);
1118 }
1119
1120 int main(int argc, char **argv)
1121 {
1122         pthread_t tid;
1123         int ret, c, opt_index, what_cmd = 0;
1124
1125         setfsuid(getuid());
1126         setfsgid(getgid());
1127
1128         while ((c = getopt_long(argc, argv, short_options, long_options,
1129                &opt_index)) != EOF) {
1130                 switch (c) {
1131                 case '4':
1132                         what_cmd |= INCLUDE_IPV4;
1133                         break;
1134                 case '6':
1135                         what_cmd |= INCLUDE_IPV6;
1136                         break;
1137                 case 'T':
1138                         what_cmd |= INCLUDE_TCP;
1139                         break;
1140                 case 'U':
1141                         what_cmd |= INCLUDE_UDP;
1142                         break;
1143                 case 'D':
1144                         what_cmd |= INCLUDE_DCCP;
1145                         break;
1146                 case 'I':
1147                         what_cmd |= INCLUDE_ICMP;
1148                         break;
1149                 case 'S':
1150                         what_cmd |= INCLUDE_SCTP;
1151                         break;
1152                 case 's':
1153                         show_src = 1;
1154                         break;
1155                 case 'u':
1156                         update_geoip();
1157                         die();
1158                         break;
1159                 case 'h':
1160                         help();
1161                         break;
1162                 case 'v':
1163                         version();
1164                         break;
1165                 default:
1166                         break;
1167                 }
1168         }
1169
1170         if (what_cmd > 0)
1171                 what = what_cmd;
1172
1173         rcu_init();
1174
1175         register_signal(SIGINT, signal_handler);
1176         register_signal(SIGQUIT, signal_handler);
1177         register_signal(SIGTERM, signal_handler);
1178         register_signal(SIGHUP, signal_handler);
1179
1180         init_geoip(1);
1181
1182         ret = pthread_create(&tid, NULL, collector, NULL);
1183         if (ret < 0)
1184                 panic("Cannot create phthread!\n");
1185
1186         presenter();
1187
1188         destroy_geoip();
1189
1190         return 0;
1191 }