src/flowtop.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2011 - 2012 Daniel Borkmann.
   5  * Copyright 2011 Emmanuel Roullit.
   6  * Subject to the GPL, version 2.
   7  *
   8  * A tiny tool to provide top-like netfilter connection tracking information.
   9  *
  10  *   The Dark Lord has Nine. But we have One, mightier than they: the White
  11  *   Rider. He has passed through the fire and the abyss, and they shall
  12  *   fear him. We will go where he leads.
  13  *
  14  *     -- The Lord of the Rings, Aragorn,
  15  *        Chapter 'The White Rider'.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <stdio.h>
  20 #include <stdint.h>
  21 #include <stdlib.h>
  22 #include <signal.h>
  23 #include <getopt.h>
  24 #include <pthread.h>
  25 #include <signal.h>
  26 #include <netdb.h>
  27 #include <ctype.h>
  28 #include <libnetfilter_conntrack/libnetfilter_conntrack.h>
  29 #include <libnetfilter_conntrack/libnetfilter_conntrack_tcp.h>
  30 #include <libnetfilter_conntrack/libnetfilter_conntrack_dccp.h>
  31 #include <libnetfilter_conntrack/libnetfilter_conntrack_sctp.h>
  32 #include <GeoIP.h>
  33 #include <GeoIPCity.h>
  34 #include <netinet/in.h>
  35 #include <curses.h>
  36 #include <dirent.h>
  37 #include <sys/stat.h>
  38 #include <urcu.h>
  39 #include <libgen.h>
  40
  41 #include "die.h"
  42 #include "xmalloc.h"
  43 #include "xio.h"
  44 #include "xutils.h"
  45 #include "built_in.h"
  46 #include "locking.h"
  47 #include "dissector_eth.h"
  48 #include "pkt_buff.h"
  49
  50 struct geo_ip_db {
  51         GeoIP *gi4, *gi6;
  52         char *path4, *path6;
  53 };
  54
  55 struct flow_entry {
  56         uint32_t flow_id, use, status;
  57         uint8_t  l3_proto, l4_proto;
  58         uint32_t ip4_src_addr, ip4_dst_addr;
  59         uint32_t ip6_src_addr[4], ip6_dst_addr[4];
  60         uint16_t port_src, port_dst;
  61         uint8_t  tcp_state, tcp_flags;
  62         uint64_t counter_pkts, counter_bytes;
  63         uint64_t timestamp_start, timestamp_stop;
  64         char country_src[128], country_dst[128];
  65         char city_src[128], city_dst[128];
  66         char rev_dns_src[256], rev_dns_dst[256];
  67         int first, procnum, inode;
  68         char cmdline[256];
  69         struct flow_entry *next;
  70 };
  71
  72 struct flow_list {
  73         struct flow_entry *head;
  74         struct spinlock lock;
  75 };
  76
  77 #ifndef ATTR_TIMESTAMP_START
  78 # define ATTR_TIMESTAMP_START 63
  79 #endif
  80 #ifndef ATTR_TIMESTAMP_STOP
  81 # define ATTR_TIMESTAMP_STOP 64
  82 #endif
  83
  84 #define SCROLL_MAX 1000
  85
  86 #define INCLUDE_IPV4    (1 << 0)
  87 #define INCLUDE_IPV6    (1 << 1)
  88 #define INCLUDE_UDP     (1 << 2)
  89 #define INCLUDE_TCP     (1 << 3)
  90 #define INCLUDE_DCCP    (1 << 4)
  91 #define INCLUDE_ICMP    (1 << 5)
  92 #define INCLUDE_SCTP    (1 << 6)
  93
  94 volatile sig_atomic_t sigint = 0;
  95
  96 static int what = INCLUDE_IPV4 | INCLUDE_IPV6 | INCLUDE_TCP, show_src = 0;
  97
  98 struct geo_ip_db geo_country, geo_city;
  99
 100 static struct flow_list flow_list;
 101
 102 static const char *short_options = "vhTULKsOPDIS46";
 103 static const struct option long_options[] = {
 104         {"ipv4",        no_argument,            NULL, '4'},
 105         {"ipv6",        no_argument,            NULL, '6'},
 106         {"tcp",         no_argument,            NULL, 'T'},
 107         {"udp",         no_argument,            NULL, 'U'},
 108         {"dccp",        no_argument,            NULL, 'D'},
 109         {"icmp",        no_argument,            NULL, 'I'},
 110         {"sctp",        no_argument,            NULL, 'S'},
 111         {"show-src",    no_argument,            NULL, 's'},
 112         {"city-db4",    required_argument,      NULL, 'L'},
 113         {"country-db4", required_argument,      NULL, 'K'},
 114         {"city-db6",    required_argument,      NULL, 'O'},
 115         {"country-db6", required_argument,      NULL, 'P'},
 116         {"version",     no_argument,            NULL, 'v'},
 117         {"help",        no_argument,            NULL, 'h'},
 118         {NULL, 0, NULL, 0}
 119 };
 120
 121 static const char *const l3proto2str[AF_MAX] = {
 122         [AF_INET]                       = "ipv4",
 123         [AF_INET6]                      = "ipv6",
 124 };
 125
 126 static const char *const l4proto2str[IPPROTO_MAX] = {
 127         [IPPROTO_TCP]                   = "tcp",
 128         [IPPROTO_UDP]                   = "udp",
 129         [IPPROTO_UDPLITE]               = "udplite",
 130         [IPPROTO_ICMP]                  = "icmp",
 131         [IPPROTO_ICMPV6]                = "icmpv6",
 132         [IPPROTO_SCTP]                  = "sctp",
 133         [IPPROTO_GRE]                   = "gre",
 134         [IPPROTO_DCCP]                  = "dccp",
 135         [IPPROTO_IGMP]                  = "igmp",
 136         [IPPROTO_IPIP]                  = "ipip",
 137         [IPPROTO_EGP]                   = "egp",
 138         [IPPROTO_PUP]                   = "pup",
 139         [IPPROTO_IDP]                   = "idp",
 140         [IPPROTO_RSVP]                  = "rsvp",
 141         [IPPROTO_IPV6]                  = "ip6tun",
 142         [IPPROTO_ESP]                   = "esp",
 143         [IPPROTO_AH]                    = "ah",
 144         [IPPROTO_PIM]                   = "pim",
 145         [IPPROTO_COMP]                  = "comp",
 146 };
 147
 148 static const char *const tcp_state2str[TCP_CONNTRACK_MAX] = {
 149         [TCP_CONNTRACK_NONE]            = "NOSTATE",
 150         [TCP_CONNTRACK_SYN_SENT]        = "SYN_SENT",
 151         [TCP_CONNTRACK_SYN_RECV]        = "SYN_RECV",
 152         [TCP_CONNTRACK_ESTABLISHED]     = "ESTABLISHED",
 153         [TCP_CONNTRACK_FIN_WAIT]        = "FIN_WAIT",
 154         [TCP_CONNTRACK_CLOSE_WAIT]      = "CLOSE_WAIT",
 155         [TCP_CONNTRACK_LAST_ACK]        = "LAST_ACK",
 156         [TCP_CONNTRACK_TIME_WAIT]       = "TIME_WAIT",
 157         [TCP_CONNTRACK_CLOSE]           = "CLOSE",
 158         [TCP_CONNTRACK_SYN_SENT2]       = "SYN_SENT2",
 159 };
 160
 161 static const uint8_t tcp_states[] = {
 162         TCP_CONNTRACK_SYN_SENT,
 163         TCP_CONNTRACK_SYN_RECV,
 164         TCP_CONNTRACK_ESTABLISHED,
 165         TCP_CONNTRACK_FIN_WAIT,
 166         TCP_CONNTRACK_CLOSE_WAIT,
 167         TCP_CONNTRACK_LAST_ACK,
 168         TCP_CONNTRACK_TIME_WAIT,
 169         TCP_CONNTRACK_CLOSE,
 170         TCP_CONNTRACK_SYN_SENT2,
 171         TCP_CONNTRACK_NONE,
 172 };
 173
 174 static const char *const dccp_state2str[DCCP_CONNTRACK_MAX] = {
 175         [DCCP_CONNTRACK_NONE]           = "NOSTATE",
 176         [DCCP_CONNTRACK_REQUEST]        = "REQUEST",
 177         [DCCP_CONNTRACK_RESPOND]        = "RESPOND",
 178         [DCCP_CONNTRACK_PARTOPEN]       = "PARTOPEN",
 179         [DCCP_CONNTRACK_OPEN]           = "OPEN",
 180         [DCCP_CONNTRACK_CLOSEREQ]       = "CLOSEREQ",
 181         [DCCP_CONNTRACK_CLOSING]        = "CLOSING",
 182         [DCCP_CONNTRACK_TIMEWAIT]       = "TIMEWAIT",
 183         [DCCP_CONNTRACK_IGNORE]         = "IGNORE",
 184         [DCCP_CONNTRACK_INVALID]        = "INVALID",
 185 };
 186
 187 static const uint8_t dccp_states[] = {
 188         DCCP_CONNTRACK_NONE,
 189         DCCP_CONNTRACK_REQUEST,
 190         DCCP_CONNTRACK_RESPOND,
 191         DCCP_CONNTRACK_PARTOPEN,
 192         DCCP_CONNTRACK_OPEN,
 193         DCCP_CONNTRACK_CLOSEREQ,
 194         DCCP_CONNTRACK_CLOSING,
 195         DCCP_CONNTRACK_TIMEWAIT,
 196         DCCP_CONNTRACK_IGNORE,
 197         DCCP_CONNTRACK_INVALID,
 198 };
 199
 200 static const char *const sctp_state2str[SCTP_CONNTRACK_MAX] = {
 201         [SCTP_CONNTRACK_NONE]           = "NOSTATE",
 202         [SCTP_CONNTRACK_CLOSED]         = "CLOSED",
 203         [SCTP_CONNTRACK_COOKIE_WAIT]    = "COOKIE_WAIT",
 204         [SCTP_CONNTRACK_COOKIE_ECHOED]  = "COOKIE_ECHOED",
 205         [SCTP_CONNTRACK_ESTABLISHED]    = "ESTABLISHED",
 206         [SCTP_CONNTRACK_SHUTDOWN_SENT]  = "SHUTDOWN_SENT",
 207         [SCTP_CONNTRACK_SHUTDOWN_RECD]  = "SHUTDOWN_RECD",
 208         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = "SHUTDOWN_ACK_SENT",
 209 };
 210
 211 static const uint8_t sctp_states[] = {
 212         SCTP_CONNTRACK_NONE,
 213         SCTP_CONNTRACK_CLOSED,
 214         SCTP_CONNTRACK_COOKIE_WAIT,
 215         SCTP_CONNTRACK_COOKIE_ECHOED,
 216         SCTP_CONNTRACK_ESTABLISHED,
 217         SCTP_CONNTRACK_SHUTDOWN_SENT,
 218         SCTP_CONNTRACK_SHUTDOWN_RECD,
 219         SCTP_CONNTRACK_SHUTDOWN_ACK_SENT,
 220 };
 221
 222 static const struct nfct_filter_ipv4 filter_ipv4 = {
 223         .addr = __constant_htonl(INADDR_LOOPBACK),
 224         .mask = 0xffffffff,
 225 };
 226
 227 static const struct nfct_filter_ipv6 filter_ipv6 = {
 228         .addr = { 0x0, 0x0, 0x0, 0x1 },
 229         .mask = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff },
 230 };
 231
 232 static void signal_handler(int number)
 233 {
 234         switch (number) {
 235         case SIGINT:
 236                 sigint = 1;
 237                 break;
 238         case SIGHUP:
 239         default:
 240                 break;
 241         }
 242 }
 243
 244 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct);
 245 static void flow_entry_get_extended(struct flow_entry *n);
 246
 247 static void help(void)
 248 {
 249         printf("\nflowtop %s, top-like netfilter TCP/UDP flow tracking\n",
 250                VERSION_STRING);
 251         puts("http://www.netsniff-ng.org\n\n"
 252              "Usage: flowtop [options]\n"
 253              "Options:\n"
 254              "  -4|--ipv4              Show only IPv4 flows (default)\n"
 255              "  -6|--ipv6              Show only IPv6 flows (default)\n"
 256              "  -T|--tcp               Show only TCP flows (default)\n"
 257              "  -U|--udp               Show only UDP flows\n"
 258              "  -D|--dccp              Show only DCCP flows\n"
 259              "  -I|--icmp              Show only ICMP/ICMPv6 flows\n"
 260              "  -S|--sctp              Show only SCTP flows\n"
 261              "  -s|--show-src          Also show source, not only dest\n"
 262              "  --city-db4 <path>      Specifiy path for geoip4 city database\n"
 263              "  --country-db4 <path>   Specifiy path for geoip4 country database\n"
 264              "  --city-db6 <path>      Specifiy path for geoip6 city database\n"
 265              "  --country-db6 <path>   Specifiy path for geoip6 country database\n"
 266              "  -v|--version           Print version\n"
 267              "  -h|--help              Print this help\n\n"
 268              "Examples:\n"
 269              "  flowtop\n"
 270              "  flowtop -46UTDISs\n\n"
 271              "Note:\n"
 272              "  If netfilter is not running, you can activate it with i.e.:\n"
 273              "   iptables -A INPUT -p tcp -m state --state ESTABLISHED -j ACCEPT\n"
 274              "   iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT\n\n"
 275              "Please report bugs to <bugs@netsniff-ng.org>\n"
 276              "Copyright (C) 2011-2012 Daniel Borkmann <daniel@netsniff-ng.org>\n"
 277              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel@netsniff-ng.org>\n"
 278              "License: GNU GPL version 2.0\n"
 279              "This is free software: you are free to change and redistribute it.\n"
 280              "There is NO WARRANTY, to the extent permitted by law.\n");
 281         die();
 282 }
 283
 284 static void version(void)
 285 {
 286         printf("\nflowtop %s, top-like netfilter TCP/UDP flow tracking\n",
 287                VERSION_STRING);
 288         puts("http://www.netsniff-ng.org\n\n"
 289              "Please report bugs to <bugs@netsniff-ng.org>\n"
 290              "Copyright (C) 2011-2012 Daniel Borkmann <daniel@netsniff-ng.org>\n"
 291              "Copyright (C) 2011-2012 Emmanuel Roullit <emmanuel@netsniff-ng.org>\n"
 292              "License: GNU GPL version 2.0\n"
 293              "This is free software: you are free to change and redistribute it.\n"
 294              "There is NO WARRANTY, to the extent permitted by law.\n");
 295         die();
 296 }
 297
 298 static inline struct flow_entry *flow_entry_xalloc(void)
 299 {
 300         struct flow_entry *n;
 301
 302         n = xzmalloc(sizeof(*n));
 303         n->first = 1;
 304
 305         return n;
 306 }
 307
 308 static inline void flow_entry_xfree(struct flow_entry *n)
 309 {
 310         xfree(n);
 311 }
 312
 313 static inline void flow_list_init(struct flow_list *fl)
 314 {
 315         fl->head = NULL;
 316         spinlock_init(&fl->lock);
 317 }
 318
 319 static void flow_list_new_entry(struct flow_list *fl, struct nf_conntrack *ct)
 320 {
 321         struct flow_entry *n = flow_entry_xalloc();
 322
 323         rcu_assign_pointer(n->next, fl->head);
 324         rcu_assign_pointer(fl->head, n);
 325
 326         flow_entry_from_ct(n, ct);
 327         flow_entry_get_extended(n);
 328 }
 329
 330 static struct flow_entry *flow_list_find_id(struct flow_list *fl,
 331                                             uint32_t id)
 332 {
 333         struct flow_entry *n = rcu_dereference(fl->head);
 334
 335         while (n != NULL) {
 336                 if (n->flow_id == id)
 337                         return n;
 338
 339                 n = rcu_dereference(n->next);
 340         }
 341
 342         return NULL;
 343 }
 344
 345 static struct flow_entry *flow_list_find_prev_id(struct flow_list *fl,
 346                                                  uint32_t id)
 347 {
 348         struct flow_entry *n = rcu_dereference(fl->head), *tmp;
 349
 350         if (n->flow_id == id)
 351                 return NULL;
 352
 353         while ((tmp = rcu_dereference(n->next)) != NULL) {
 354                 if (tmp->flow_id == id)
 355                         return n;
 356
 357                 n = tmp;
 358         }
 359
 360         return NULL;
 361 }
 362
 363 static void flow_list_update_entry(struct flow_list *fl,
 364                                    struct nf_conntrack *ct)
 365 {
 366         int do_ext = 0;
 367         struct flow_entry *n;
 368
 369         n = flow_list_find_id(fl, nfct_get_attr_u32(ct, ATTR_ID));
 370         if (n == NULL) {
 371                 n = flow_entry_xalloc();
 372
 373                 rcu_assign_pointer(n->next, fl->head);
 374                 rcu_assign_pointer(fl->head, n);
 375
 376                 do_ext = 1;
 377         }
 378
 379         flow_entry_from_ct(n, ct);
 380         if (do_ext)
 381                 flow_entry_get_extended(n);
 382 }
 383
 384 static void flow_list_destroy_entry(struct flow_list *fl,
 385                                     struct nf_conntrack *ct)
 386 {
 387         struct flow_entry *n1, *n2;
 388         uint32_t id = nfct_get_attr_u32(ct, ATTR_ID);
 389
 390         n1 = flow_list_find_id(fl, id);
 391         if (n1) {
 392                 n2 = flow_list_find_prev_id(fl, id);
 393                 if (n2) {
 394                         rcu_assign_pointer(n2->next, n1->next);
 395                         rcu_assign_pointer(n1->next, NULL);
 396
 397                         flow_entry_xfree(n1);
 398                 } else {
 399                         flow_entry_xfree(fl->head);
 400
 401                         rcu_assign_pointer(fl->head, NULL);
 402                 }
 403         }
 404 }
 405
 406 static void flow_list_destroy(struct flow_list *fl)
 407 {
 408         struct flow_entry *n;
 409
 410         while (fl->head != NULL) {
 411                 n = rcu_dereference(fl->head->next);
 412                 rcu_assign_pointer(fl->head->next, NULL);
 413
 414                 flow_entry_xfree(fl->head);
 415                 rcu_assign_pointer(fl->head, n);
 416         }
 417
 418         synchronize_rcu();
 419         spinlock_destroy(&fl->lock);
 420 }
 421
 422 static int walk_process(char *process, struct flow_entry *n)
 423 {
 424         int ret;
 425         DIR *dir;
 426         struct dirent *ent;
 427         char path[1024];
 428
 429         if (snprintf(path, sizeof(path), "/proc/%s/fd", process) == -1)
 430                 panic("giant process name! %s\n", process);
 431
 432         dir = opendir(path);
 433         if (!dir)
 434                 return 0;
 435
 436         while ((ent = readdir(dir))) {
 437                 struct stat statbuf;
 438
 439                 if (snprintf(path, sizeof(path), "/proc/%s/fd/%s",
 440                              process, ent->d_name) < 0)
 441                         continue;
 442
 443                 if (stat(path, &statbuf) < 0)
 444                         continue;
 445
 446                 if (S_ISSOCK(statbuf.st_mode) && n->inode == statbuf.st_ino) {
 447                         memset(n->cmdline, 0, sizeof(n->cmdline));
 448
 449                         snprintf(path, sizeof(path), "/proc/%s/exe", process);
 450
 451                         ret = readlink(path, n->cmdline,
 452                                        sizeof(n->cmdline) - 1);
 453                         if (ret < 0)
 454                                 panic("readlink error: %s\n", strerror(errno));
 455
 456                         n->procnum = atoi(process);
 457                         return 1;
 458                 }
 459         }
 460
 461         closedir(dir);
 462         return 0;
 463 }
 464
 465 static void walk_processes(struct flow_entry *n)
 466 {
 467         int ret;
 468         DIR *dir;
 469         struct dirent *ent;
 470
 471         /* n->inode must be set */
 472         if (n->inode <= 0) {
 473                 memset(n->cmdline, 0, sizeof(n->cmdline));
 474                 return;
 475         }
 476
 477         dir = opendir("/proc");
 478         if (!dir)
 479                 panic("Cannot open /proc!\n");
 480
 481         while ((ent = readdir(dir))) {
 482                 if (strspn(ent->d_name, "0123456789") == strlen(ent->d_name)) {
 483                         ret = walk_process(ent->d_name, n);
 484                         if (ret > 0)
 485                                 break;
 486                 }
 487         }
 488
 489         closedir(dir);
 490 }
 491
 492 static int get_port_inode(uint16_t port, int proto, int is_ip6)
 493 {
 494         int ret = -ENOENT;
 495         char path[128], buff[1024];
 496         FILE *proc;
 497
 498         memset(path, 0, sizeof(path));
 499         snprintf(path, sizeof(path), "/proc/net/%s%s",
 500                  l4proto2str[proto], is_ip6 ? "6" : "");
 501
 502         proc = fopen(path, "r");
 503         if (!proc)
 504                 return -EIO;
 505
 506         memset(buff, 0, sizeof(buff));
 507
 508         while (fgets(buff, sizeof(buff), proc) != NULL) {
 509                 int inode = 0;
 510                 unsigned int lport = 0;
 511
 512                 buff[sizeof(buff) - 1] = 0;
 513                 if (sscanf(buff, "%*u: %*X:%X %*X:%*X %*X %*X:%*X %*X:%*X "
 514                            "%*X %*u %*u %u", &lport, &inode) == 2) {
 515                         if ((uint16_t) lport == port) {
 516                                 ret = inode;
 517                                 break;
 518                         }
 519                 }
 520
 521                 memset(buff, 0, sizeof(buff));
 522         }
 523
 524         fclose(proc);
 525         return ret;
 526 }
 527
 528 #define CP_NFCT(elem, attr, x)                          \
 529         do { n->elem = nfct_get_attr_u##x(ct,(attr)); } while (0)
 530 #define CP_NFCT_BUFF(elem, attr) do {                   \
 531         const uint8_t *buff = nfct_get_attr(ct,(attr)); \
 532         if (buff != NULL)                               \
 533                 memcpy(n->elem, buff, sizeof(n->elem)); \
 534 } while (0)
 535
 536 static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct)
 537 {
 538         CP_NFCT(l3_proto, ATTR_ORIG_L3PROTO, 8);
 539         CP_NFCT(l4_proto, ATTR_ORIG_L4PROTO, 8);
 540         CP_NFCT(ip4_src_addr, ATTR_ORIG_IPV4_SRC, 32);
 541         CP_NFCT(ip4_dst_addr, ATTR_ORIG_IPV4_DST, 32);
 542         CP_NFCT(port_src, ATTR_ORIG_PORT_SRC, 16);
 543         CP_NFCT(port_dst, ATTR_ORIG_PORT_DST, 16);
 544         CP_NFCT(status, ATTR_STATUS, 32);
 545         CP_NFCT(tcp_state, ATTR_TCP_STATE, 8);
 546         CP_NFCT(tcp_flags, ATTR_TCP_FLAGS_ORIG, 8);
 547         CP_NFCT(counter_pkts, ATTR_ORIG_COUNTER_PACKETS, 64);
 548         CP_NFCT(counter_bytes, ATTR_ORIG_COUNTER_BYTES, 64);
 549         CP_NFCT(timestamp_start, ATTR_TIMESTAMP_START, 64);
 550         CP_NFCT(timestamp_stop, ATTR_TIMESTAMP_STOP, 64);
 551         CP_NFCT(flow_id, ATTR_ID, 32);
 552         CP_NFCT(use, ATTR_USE, 32);
 553
 554         CP_NFCT_BUFF(ip6_src_addr, ATTR_ORIG_IPV6_SRC);
 555         CP_NFCT_BUFF(ip6_dst_addr, ATTR_ORIG_IPV6_DST);
 556
 557         n->port_src = ntohs(n->port_src);
 558         n->port_dst = ntohs(n->port_dst);
 559
 560         n->ip4_src_addr = ntohl(n->ip4_src_addr);
 561         n->ip4_dst_addr = ntohl(n->ip4_dst_addr);
 562
 563         if (n->first) {
 564                 n->inode = get_port_inode(n->port_src, n->l4_proto,
 565                                           n->l3_proto == AF_INET6);
 566                 if (n->inode > 0)
 567                         walk_processes(n);
 568         }
 569
 570         n->first = 0;
 571 }
 572
 573 enum flow_entry_direction {
 574         flow_entry_src,
 575         flow_entry_dst,
 576 };
 577
 578 static inline int flow_entry_get_extended_is_dns(struct flow_entry *n)
 579 {
 580         /* We don't want to analyze / display DNS itself, since we
 581          * use it to resolve reverse dns.
 582          */
 583         return n->port_src == 53 || n->port_dst == 53;
 584 }
 585
 586 #define SELFLD(dir,src_member,dst_member)       \
 587         (((dir) == flow_entry_src) ? n->src_member : n->dst_member)
 588
 589 static struct sockaddr_in *
 590 flow_entry_get_sain4_obj(struct flow_entry *n, enum flow_entry_direction dir,
 591                          struct sockaddr_in *sa)
 592 {
 593         memset(sa, 0, sizeof(*sa));
 594         sa->sin_family = PF_INET;
 595         sa->sin_addr.s_addr = htonl(SELFLD(dir, ip4_src_addr, ip4_dst_addr));
 596
 597         return sa;
 598 }
 599
 600 static struct sockaddr_in6 *
 601 flow_entry_get_sain6_obj(struct flow_entry *n, enum flow_entry_direction dir,
 602                          struct sockaddr_in6 *sa)
 603 {
 604         memset(sa, 0, sizeof(*sa));
 605         sa->sin6_family = PF_INET6;
 606
 607         memcpy(&sa->sin6_addr, SELFLD(dir, ip6_src_addr, ip6_dst_addr),
 608                sizeof(SELFLD(dir, ip6_src_addr, ip6_dst_addr)));
 609
 610         return sa;
 611 }
 612
 613 static void
 614 flow_entry_geo_city_lookup_generic(struct flow_entry *n,
 615                                    enum flow_entry_direction dir)
 616 {
 617         GeoIPRecord *gir = NULL;
 618         struct sockaddr_in sa4;
 619         struct sockaddr_in6 sa6;
 620         inline const char *make_na(const char *p) { return p ? : "N/A"; }
 621         const char *city = 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                 gir = GeoIP_record_by_ipnum(geo_city.gi4,
 630                                             ntohl(sa4.sin_addr.s_addr));
 631                 break;
 632
 633         case AF_INET6:
 634                 flow_entry_get_sain6_obj(n, dir, &sa6);
 635                 gir = GeoIP_record_by_ipnum_v6(geo_city.gi6, sa6.sin6_addr);
 636                 break;
 637         }
 638
 639         city = make_na(gir != NULL ? gir->city : city);
 640
 641         bug_on(sizeof(n->city_src) != sizeof(n->city_dst));
 642         memcpy(SELFLD(dir, city_src, city_dst), city,
 643                min(sizeof(n->city_src), strlen(city)));
 644 }
 645
 646 static void
 647 flow_entry_geo_country_lookup_generic(struct flow_entry *n,
 648                                       enum flow_entry_direction dir)
 649 {
 650         struct sockaddr_in sa4;
 651         struct sockaddr_in6 sa6;
 652         inline const char *make_na(const char *p) { return p ? : "N/A"; }
 653         const char *country = NULL;
 654
 655         switch (n->l3_proto) {
 656         default:
 657                 bug();
 658
 659         case AF_INET:
 660                 flow_entry_get_sain4_obj(n, dir, &sa4);
 661                 country = GeoIP_country_name_by_ipnum(geo_country.gi4,
 662                                                 ntohl(sa4.sin_addr.s_addr));
 663                 break;
 664
 665         case AF_INET6:
 666                 flow_entry_get_sain6_obj(n, dir, &sa6);
 667                 country = GeoIP_country_name_by_ipnum_v6(geo_country.gi6,
 668                                                          sa6.sin6_addr);
 669                 break;
 670         }
 671
 672         country = make_na(country);
 673
 674         bug_on(sizeof(n->country_src) != sizeof(n->country_dst));
 675         memcpy(SELFLD(dir, country_src, country_dst), country,
 676                min(sizeof(n->country_src), strlen(country)));
 677 }
 678
 679 static void flow_entry_get_extended_geo(struct flow_entry *n,
 680                                         enum flow_entry_direction dir)
 681 {
 682         flow_entry_geo_city_lookup_generic(n, dir);
 683         flow_entry_geo_country_lookup_generic(n, dir);
 684 }
 685
 686 static void flow_entry_get_extended_revdns(struct flow_entry *n,
 687                                            enum flow_entry_direction dir)
 688 {
 689         size_t sa_len;
 690         struct sockaddr_in sa4;
 691         struct sockaddr_in6 sa6;
 692         struct sockaddr *sa;
 693         struct hostent *hent;
 694
 695         switch (n->l3_proto) {
 696         default:
 697                 bug();
 698
 699         case AF_INET:
 700                 flow_entry_get_sain4_obj(n, dir, &sa4);
 701                 sa = (struct sockaddr *) &sa4;
 702                 sa_len = sizeof(sa4);
 703                 hent = gethostbyaddr(&sa4.sin_addr, sizeof(sa4.sin_addr),
 704                                      AF_INET);
 705                 break;
 706
 707         case AF_INET6:
 708                 flow_entry_get_sain6_obj(n, dir, &sa6);
 709                 sa = (struct sockaddr *) &sa6;
 710                 sa_len = sizeof(sa6);
 711                 hent = gethostbyaddr(&sa6.sin6_addr, sizeof(sa6.sin6_addr),
 712                                      AF_INET6);
 713                 break;
 714         }
 715
 716         bug_on(sizeof(n->rev_dns_src) != sizeof(n->rev_dns_dst));
 717         getnameinfo(sa, sa_len, SELFLD(dir, rev_dns_src, rev_dns_dst),
 718                     sizeof(n->rev_dns_src), NULL, 0, NI_NUMERICHOST);
 719
 720         if (hent) {
 721                 memset(n->rev_dns_dst, 0, sizeof(n->rev_dns_dst));
 722                 memcpy(SELFLD(dir, rev_dns_src, rev_dns_dst),
 723                        hent->h_name, min(sizeof(n->rev_dns_src),
 724                                          strlen(hent->h_name)));
 725         }
 726 }
 727
 728 static void flow_entry_get_extended(struct flow_entry *n)
 729 {
 730         if (n->flow_id == 0 || flow_entry_get_extended_is_dns(n))
 731                 return;
 732
 733         flow_entry_get_extended_revdns(n, flow_entry_src);
 734         flow_entry_get_extended_geo(n, flow_entry_src);
 735
 736         flow_entry_get_extended_revdns(n, flow_entry_dst);
 737         flow_entry_get_extended_geo(n, flow_entry_dst);
 738 }
 739
 740 static uint16_t presenter_get_port(uint16_t src, uint16_t dst, int tcp)
 741 {
 742         if (src < dst && src < 1024) {
 743                 return src;
 744         } else if (dst < src && dst < 1024) {
 745                 return dst;
 746         } else {
 747                 const char *tmp1, *tmp2;
 748                 if (tcp) {
 749                         tmp1 = lookup_port_tcp(src);
 750                         tmp2 = lookup_port_tcp(dst);
 751                 } else {
 752                         tmp1 = lookup_port_udp(src);
 753                         tmp2 = lookup_port_udp(dst);
 754                 }
 755                 if (tmp1 && !tmp2) {
 756                         return src;
 757                 } else if (!tmp1 && tmp2) {
 758                         return dst;
 759                 } else {
 760                         if (src < dst)
 761                                 return src;
 762                         else
 763                                 return dst;
 764                 }
 765         }
 766 }
 767
 768 static void presenter_screen_init(WINDOW **screen)
 769 {
 770         (*screen) = initscr();
 771         noecho();
 772         cbreak();
 773         keypad(stdscr, TRUE);
 774         nodelay(*screen, TRUE);
 775         refresh();
 776         wrefresh(*screen);
 777 }
 778
 779 static void presenter_screen_do_line(WINDOW *screen, struct flow_entry *n,
 780                                      unsigned int *line)
 781 {
 782         char tmp[128];
 783         uint16_t port;
 784
 785         mvwprintw(screen, *line, 2, "");
 786
 787         /* PID, application name */
 788         if (n->procnum > 0) {
 789                 slprintf(tmp, sizeof(tmp), "%u/%s", n->procnum,
 790                          basename(n->cmdline));
 791
 792                 printw("[");
 793                 attron(COLOR_PAIR(3));
 794                 printw("%s", tmp);
 795                 attroff(COLOR_PAIR(3));
 796                 printw("]:");
 797         }
 798
 799         /* L3 protocol, L4 protocol, TCP state */
 800         printw("%s:%s", l3proto2str[n->l3_proto], l4proto2str[n->l4_proto]);
 801         printw("[");
 802         attron(COLOR_PAIR(3));
 803         printw("%s", tcp_state2str[n->tcp_state]);
 804         attroff(COLOR_PAIR(3));
 805         printw("]:");
 806
 807         /* Guess application port */
 808         attron(A_BOLD);
 809         if (n->tcp_state != TCP_CONNTRACK_NONE) {
 810                 port = presenter_get_port(n->port_src, n->port_dst, 1);
 811                 printw("%s ->", lookup_port_tcp(port));
 812         } else {
 813                 port = presenter_get_port(n->port_src, n->port_dst, 0);
 814                 printw("%s ->", lookup_port_udp(port));
 815         }
 816         attroff(A_BOLD);
 817
 818 #if 0
 819         /* Number packets, bytes */
 820         printw("(%upkts/%ubytes) ->", n->counter_pkts, n->counter_bytes);
 821 #endif
 822
 823         /* Show source information: reverse DNS, port, country, city */
 824         if (show_src) {
 825                 attron(COLOR_PAIR(1));
 826                 mvwprintw(screen, ++(*line), 8, "src: %s", n->rev_dns_src);
 827                 attroff(COLOR_PAIR(1));
 828
 829                 printw(":%u (", n->port_src);
 830
 831                 attron(COLOR_PAIR(4));
 832                 printw("%s", n->country_src);
 833                 attroff(COLOR_PAIR(4));
 834
 835                 printw(", %s) => ", n->city_src);
 836         }
 837
 838         /* Show dest information: reverse DNS, port, country, city */
 839         attron(COLOR_PAIR(2));
 840         mvwprintw(screen, ++(*line), 8, "dst: %s", n->rev_dns_dst);
 841         attroff(COLOR_PAIR(2));
 842
 843         printw(":%u (", n->port_dst);
 844
 845         attron(COLOR_PAIR(4));
 846         printw("%s", n->country_dst);
 847         attroff(COLOR_PAIR(4));
 848
 849         printw(", %s)", n->city_dst);
 850 }
 851
 852 static void presenter_screen_update(WINDOW *screen, struct flow_list *fl,
 853                                     int skip_lines)
 854 {
 855         int i, maxy;
 856         unsigned int line = 3;
 857         struct flow_entry *n;
 858
 859         curs_set(0);
 860
 861         maxy = getmaxy(screen);
 862
 863         start_color();
 864         init_pair(1, COLOR_RED, COLOR_BLACK);
 865         init_pair(2, COLOR_BLUE, COLOR_BLACK);
 866         init_pair(3, COLOR_YELLOW, COLOR_BLACK);
 867         init_pair(4, COLOR_GREEN, COLOR_BLACK);
 868
 869         wclear(screen);
 870         clear();
 871
 872         mvwprintw(screen, 1, 2, "Kernel netfilter TCP/UDP "
 873                   "flow statistics, [+%d]", skip_lines);
 874
 875         rcu_read_lock();
 876
 877         if (rcu_dereference(fl->head) == NULL)
 878                 mvwprintw(screen, line, 2, "(No active sessions! "
 879                           "Is netfilter running?)");
 880
 881         maxy -= 6;
 882         /* Yes, that's lame :-P */
 883         for (i = 0; i < sizeof(tcp_states); i++) {
 884                 n = rcu_dereference(fl->head);
 885                 while (n && maxy > 0) {
 886                         if (n->tcp_state != tcp_states[i] ||
 887                             (i != TCP_CONNTRACK_NONE &&
 888                              n->tcp_state == TCP_CONNTRACK_NONE) ||
 889                             /* Filter out DNS */
 890                             presenter_get_port(n->port_src,
 891                                                n->port_dst, 0) == 53) {
 892                                 n = rcu_dereference(n->next);
 893                                 continue;
 894                         }
 895                         if (skip_lines > 0) {
 896                                 n = rcu_dereference(n->next);
 897                                 skip_lines--;
 898                                 continue;
 899                         }
 900
 901                         presenter_screen_do_line(screen, n, &line);
 902
 903                         line++;
 904                         maxy -= (2 + 1 * show_src);
 905                         n = rcu_dereference(n->next);
 906                 }
 907         }
 908
 909         rcu_read_unlock();
 910
 911         wrefresh(screen);
 912         refresh();
 913 }
 914
 915 static inline void presenter_screen_end(void)
 916 {
 917         endwin();
 918 }
 919
 920 static void presenter(void)
 921 {
 922         int skip_lines = 0;
 923         WINDOW *screen = NULL;
 924
 925         dissector_init_ethernet(0);
 926         presenter_screen_init(&screen);
 927
 928         rcu_register_thread();
 929         while (!sigint) {
 930                 switch (getch()) {
 931                 case 'q':
 932                         sigint = 1;
 933                         break;
 934                 case KEY_UP:
 935                 case 'u':
 936                 case 'k':
 937                         skip_lines--;
 938                         if (skip_lines < 0)
 939                                 skip_lines = 0;
 940                         break;
 941                 case KEY_DOWN:
 942                 case 'd':
 943                 case 'j':
 944                         skip_lines++;
 945                         if (skip_lines > SCROLL_MAX)
 946                                 skip_lines = SCROLL_MAX;
 947                         break;
 948                 default:
 949                         fflush(stdin);
 950                         break;
 951                 }
 952
 953                 presenter_screen_update(screen, &flow_list, skip_lines);
 954                 usleep(100000);
 955         }
 956         rcu_unregister_thread();
 957
 958         presenter_screen_end();
 959         dissector_cleanup_ethernet();
 960 }
 961
 962 static int collector_cb(enum nf_conntrack_msg_type type,
 963                         struct nf_conntrack *ct, void *data)
 964 {
 965         if (sigint)
 966                 return NFCT_CB_STOP;
 967
 968         synchronize_rcu();
 969         spinlock_lock(&flow_list.lock);
 970
 971         switch (type) {
 972         case NFCT_T_NEW:
 973                 flow_list_new_entry(&flow_list, ct);
 974                 break;
 975         case NFCT_T_UPDATE:
 976                 flow_list_update_entry(&flow_list, ct);
 977                 break;
 978         case NFCT_T_DESTROY:
 979                 flow_list_destroy_entry(&flow_list, ct);
 980                 break;
 981         default:
 982                 break;
 983         }
 984
 985         spinlock_unlock(&flow_list.lock);
 986
 987         return NFCT_CB_CONTINUE;
 988 }
 989
 990 static inline GeoIP *collector_geoip_open(const char *path, int type)
 991 {
 992         if (path != NULL)
 993                 return GeoIP_open(path, GEOIP_MMAP_CACHE);
 994         else
 995                 return GeoIP_open_type(type, GEOIP_MMAP_CACHE);
 996 }
 997
 998 static void collector_load_geoip(void)
 999 {
1000         geo_country.gi4 = collector_geoip_open(geo_country.path4,
1001                                                GEOIP_COUNTRY_EDITION);
1002         if (geo_country.gi4 == NULL)
1003                 panic("Cannot open GeoIP4 country database!\n");
1004
1005         geo_country.gi6 = collector_geoip_open(geo_country.path6,
1006                                                GEOIP_COUNTRY_EDITION_V6);
1007         if (geo_country.gi6 == NULL)
1008                 panic("Cannot open GeoIP6 country database!\n");
1009
1010         geo_city.gi4 = collector_geoip_open(geo_city.path4,
1011                                             GEOIP_CITY_EDITION_REV1);
1012         if (geo_city.gi4 == NULL)
1013                 panic("Cannot open GeoIP4 city database!\n");
1014
1015         geo_city.gi6 = collector_geoip_open(geo_city.path6,
1016                                             GEOIP_CITY_EDITION_REV1_V6);
1017         if (geo_city.gi6 == NULL)
1018                 panic("Cannot open GeoIP6 city database!\n");
1019
1020         GeoIP_set_charset(geo_country.gi4, GEOIP_CHARSET_UTF8);
1021         GeoIP_set_charset(geo_country.gi6, GEOIP_CHARSET_UTF8);
1022
1023         GeoIP_set_charset(geo_city.gi4, GEOIP_CHARSET_UTF8);
1024         GeoIP_set_charset(geo_city.gi6, GEOIP_CHARSET_UTF8);
1025 }
1026
1027 static void collector_destroy_geoip(void)
1028 {
1029         GeoIP_delete(geo_country.gi4);
1030         GeoIP_delete(geo_country.gi6);
1031
1032         GeoIP_delete(geo_city.gi4);
1033         GeoIP_delete(geo_city.gi6);
1034 }
1035
1036 static void *collector(void *null)
1037 {
1038         int ret;
1039         struct nfct_handle *handle;
1040         struct nfct_filter *filter;
1041
1042         handle = nfct_open(CONNTRACK, NFCT_ALL_CT_GROUPS);
1043         if (!handle)
1044                 panic("Cannot create a nfct handle!\n");
1045
1046         filter = nfct_filter_create();
1047         if (!filter)
1048                 panic("Cannot create a nfct filter!\n");
1049
1050         if (what & INCLUDE_UDP)
1051                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDP);
1052         if (what & INCLUDE_TCP)
1053                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_TCP);
1054         if (what & INCLUDE_DCCP)
1055                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_DCCP);
1056         if (what & INCLUDE_SCTP)
1057                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_SCTP);
1058         if (what & INCLUDE_ICMP && what & INCLUDE_IPV4)
1059                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMP);
1060         if (what & INCLUDE_ICMP && what & INCLUDE_IPV6)
1061                 nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_ICMPV6);
1062         if (what & INCLUDE_IPV4) {
1063                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV4,
1064                                       NFCT_FILTER_LOGIC_NEGATIVE);
1065                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV4, &filter_ipv4);
1066         }
1067         if (what & INCLUDE_IPV6) {
1068                 nfct_filter_set_logic(filter, NFCT_FILTER_SRC_IPV6,
1069                                       NFCT_FILTER_LOGIC_NEGATIVE);
1070                 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV6, &filter_ipv6);
1071         }
1072
1073         ret = nfct_filter_attach(nfct_fd(handle), filter);
1074         if (ret < 0)
1075                 panic("Cannot attach filter to handle!\n");
1076
1077         nfct_callback_register(handle, NFCT_T_ALL, collector_cb, NULL);
1078
1079         collector_load_geoip();
1080
1081         flow_list_init(&flow_list);
1082
1083         rcu_register_thread();
1084         while (!sigint)
1085                 nfct_catch(handle);
1086         rcu_unregister_thread();
1087
1088         flow_list_destroy(&flow_list);
1089
1090         collector_destroy_geoip();
1091
1092         nfct_filter_destroy(filter);
1093         nfct_close(handle);
1094
1095         pthread_exit(0);
1096 }
1097
1098 int main(int argc, char **argv)
1099 {
1100         pthread_t tid;
1101         int ret, c, opt_index, what_cmd = 0;
1102
1103         memset(&geo_country, 0, sizeof(geo_country));
1104         memset(&geo_city, 0, sizeof(geo_city));
1105
1106         while ((c = getopt_long(argc, argv, short_options, long_options,
1107                &opt_index)) != EOF) {
1108                 switch (c) {
1109                 case '4':
1110                         what_cmd |= INCLUDE_IPV4;
1111                         break;
1112                 case '6':
1113                         what_cmd |= INCLUDE_IPV6;
1114                         break;
1115                 case 'T':
1116                         what_cmd |= INCLUDE_TCP;
1117                         break;
1118                 case 'U':
1119                         what_cmd |= INCLUDE_UDP;
1120                         break;
1121                 case 'D':
1122                         what_cmd |= INCLUDE_DCCP;
1123                         break;
1124                 case 'I':
1125                         what_cmd |= INCLUDE_ICMP;
1126                         break;
1127                 case 'S':
1128                         what_cmd |= INCLUDE_SCTP;
1129                         break;
1130                 case 's':
1131                         show_src = 1;
1132                         break;
1133                 case 'L':
1134                         geo_city.path4 = xstrdup(optarg);
1135                         break;
1136                 case 'K':
1137                         geo_country.path4 = xstrdup(optarg);
1138                         break;
1139                 case 'O':
1140                         geo_city.path6 = xstrdup(optarg);
1141                         break;
1142                 case 'P':
1143                         geo_country.path6 = xstrdup(optarg);
1144                         break;
1145                 case 'h':
1146                         help();
1147                         break;
1148                 case 'v':
1149                         version();
1150                         break;
1151                 case '?':
1152                         switch (optopt) {
1153                         case 'L':
1154                         case 'K':
1155                         case 'O':
1156                         case 'P':
1157                                 panic("Option -%c requires an argument!\n",
1158                                       optopt);
1159                         default:
1160                                 if (isprint(optopt))
1161                                         whine("Unknown option character "
1162                                               "`0x%X\'!\n", optopt);
1163                                 die();
1164                         }
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(SIGHUP, signal_handler);
1177
1178         ret = pthread_create(&tid, NULL, collector, NULL);
1179         if (ret < 0)
1180                 panic("Cannot create phthread!\n");
1181
1182         presenter();
1183
1184         free(geo_country.path4);
1185         free(geo_country.path6);
1186
1187         free(geo_city.path4);
1188         free(geo_city.path6);
1189
1190         return 0;
1191 }