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flowtop.c
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flowtop.c
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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2011 - 2013 Daniel Borkmann.
* Copyright 2011 Emmanuel Roullit.
* Subject to the GPL, version 2.
*/
#define _LGPL_SOURCE
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <signal.h>
#include <getopt.h>
#include <pthread.h>
#include <signal.h>
#include <netdb.h>
#include <ctype.h>
#include <netinet/in.h>
#include <curses.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/fsuid.h>
#include <urcu.h>
#include <libgen.h>
#include <inttypes.h>
#include "die.h"
#include "xmalloc.h"
#include "conntrack.h"
#include "config.h"
#include "str.h"
#include "sig.h"
#include "lookup.h"
#include "geoip.h"
#include "built_in.h"
#include "locking.h"
#include "pkt_buff.h"
#include "screen.h"
struct flow_entry {
uint32_t flow_id, use, status;
uint8_t l3_proto, l4_proto;
uint32_t ip4_src_addr, ip4_dst_addr;
uint32_t ip6_src_addr[4], ip6_dst_addr[4];
uint16_t port_src, port_dst;
uint8_t tcp_state, tcp_flags, sctp_state, dccp_state;
uint64_t counter_pkts, counter_bytes;
uint64_t timestamp_start, timestamp_stop;
char country_src[128], country_dst[128];
char city_src[128], city_dst[128];
char rev_dns_src[256], rev_dns_dst[256];
char cmdline[256];
struct flow_entry *next;
int inode;
unsigned int procnum;
};
struct flow_list {
struct flow_entry *head;
struct spinlock lock;
};
#ifndef ATTR_TIMESTAMP_START
# define ATTR_TIMESTAMP_START 63
#endif
#ifndef ATTR_TIMESTAMP_STOP
# define ATTR_TIMESTAMP_STOP 64
#endif
#define SCROLL_MAX 1000
#define INCLUDE_IPV4 (1 << 0)
#define INCLUDE_IPV6 (1 << 1)
#define INCLUDE_UDP (1 << 2)
#define INCLUDE_TCP (1 << 3)
#define INCLUDE_DCCP (1 << 4)
#define INCLUDE_ICMP (1 << 5)
#define INCLUDE_SCTP (1 << 6)
static volatile sig_atomic_t sigint = 0;
static int what = INCLUDE_IPV4 | INCLUDE_IPV6 | INCLUDE_TCP, show_src = 0;
static struct flow_list flow_list;
static const char *short_options = "vhTUsDIS46u";
static const struct option long_options[] = {
{"ipv4", no_argument, NULL, '4'},
{"ipv6", no_argument, NULL, '6'},
{"tcp", no_argument, NULL, 'T'},
{"udp", no_argument, NULL, 'U'},
{"dccp", no_argument, NULL, 'D'},
{"icmp", no_argument, NULL, 'I'},
{"sctp", no_argument, NULL, 'S'},
{"show-src", no_argument, NULL, 's'},
{"update", no_argument, NULL, 'u'},
{"version", no_argument, NULL, 'v'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0}
};
static const char *copyright = "Please report bugs to <[email protected]>\n"
"Copyright (C) 2011-2013 Daniel Borkmann <[email protected]>\n"
"Copyright (C) 2011-2012 Emmanuel Roullit <[email protected]>\n"
"Swiss federal institute of technology (ETH Zurich)\n"
"License: GNU GPL version 2.0\n"
"This is free software: you are free to change and redistribute it.\n"
"There is NO WARRANTY, to the extent permitted by law.\n";
static const char *const l3proto2str[AF_MAX] = {
[AF_INET] = "ipv4",
[AF_INET6] = "ipv6",
};
static const char *const l4proto2str[IPPROTO_MAX] = {
[IPPROTO_TCP] = "tcp",
[IPPROTO_UDP] = "udp",
[IPPROTO_UDPLITE] = "udplite",
[IPPROTO_ICMP] = "icmp",
[IPPROTO_ICMPV6] = "icmpv6",
[IPPROTO_SCTP] = "sctp",
[IPPROTO_GRE] = "gre",
[IPPROTO_DCCP] = "dccp",
[IPPROTO_IGMP] = "igmp",
[IPPROTO_IPIP] = "ipip",
[IPPROTO_EGP] = "egp",
[IPPROTO_PUP] = "pup",
[IPPROTO_IDP] = "idp",
[IPPROTO_RSVP] = "rsvp",
[IPPROTO_IPV6] = "ip6tun",
[IPPROTO_ESP] = "esp",
[IPPROTO_AH] = "ah",
[IPPROTO_PIM] = "pim",
[IPPROTO_COMP] = "comp",
};
static const char *const tcp_state2str[TCP_CONNTRACK_MAX] = {
[TCP_CONNTRACK_NONE] = "NOSTATE",
[TCP_CONNTRACK_SYN_SENT] = "SYN_SENT",
[TCP_CONNTRACK_SYN_RECV] = "SYN_RECV",
[TCP_CONNTRACK_ESTABLISHED] = "ESTABLISHED",
[TCP_CONNTRACK_FIN_WAIT] = "FIN_WAIT",
[TCP_CONNTRACK_CLOSE_WAIT] = "CLOSE_WAIT",
[TCP_CONNTRACK_LAST_ACK] = "LAST_ACK",
[TCP_CONNTRACK_TIME_WAIT] = "TIME_WAIT",
[TCP_CONNTRACK_CLOSE] = "CLOSE",
[TCP_CONNTRACK_SYN_SENT2] = "SYN_SENT2",
};
static const uint8_t tcp_states[] = {
TCP_CONNTRACK_SYN_SENT,
TCP_CONNTRACK_SYN_RECV,
TCP_CONNTRACK_ESTABLISHED,
TCP_CONNTRACK_FIN_WAIT,
TCP_CONNTRACK_CLOSE_WAIT,
TCP_CONNTRACK_LAST_ACK,
TCP_CONNTRACK_TIME_WAIT,
TCP_CONNTRACK_CLOSE,
TCP_CONNTRACK_SYN_SENT2,
TCP_CONNTRACK_NONE,
};
static const char *const dccp_state2str[DCCP_CONNTRACK_MAX] = {
[DCCP_CONNTRACK_NONE] = "NOSTATE",
[DCCP_CONNTRACK_REQUEST] = "REQUEST",
[DCCP_CONNTRACK_RESPOND] = "RESPOND",
[DCCP_CONNTRACK_PARTOPEN] = "PARTOPEN",
[DCCP_CONNTRACK_OPEN] = "OPEN",
[DCCP_CONNTRACK_CLOSEREQ] = "CLOSEREQ",
[DCCP_CONNTRACK_CLOSING] = "CLOSING",
[DCCP_CONNTRACK_TIMEWAIT] = "TIMEWAIT",
[DCCP_CONNTRACK_IGNORE] = "IGNORE",
[DCCP_CONNTRACK_INVALID] = "INVALID",
};
static const uint8_t dccp_states[] = {
DCCP_CONNTRACK_NONE,
DCCP_CONNTRACK_REQUEST,
DCCP_CONNTRACK_RESPOND,
DCCP_CONNTRACK_PARTOPEN,
DCCP_CONNTRACK_OPEN,
DCCP_CONNTRACK_CLOSEREQ,
DCCP_CONNTRACK_CLOSING,
DCCP_CONNTRACK_TIMEWAIT,
DCCP_CONNTRACK_IGNORE,
DCCP_CONNTRACK_INVALID,
};
static const char *const sctp_state2str[SCTP_CONNTRACK_MAX] = {
[SCTP_CONNTRACK_NONE] = "NOSTATE",
[SCTP_CONNTRACK_CLOSED] = "CLOSED",
[SCTP_CONNTRACK_COOKIE_WAIT] = "COOKIE_WAIT",
[SCTP_CONNTRACK_COOKIE_ECHOED] = "COOKIE_ECHOED",
[SCTP_CONNTRACK_ESTABLISHED] = "ESTABLISHED",
[SCTP_CONNTRACK_SHUTDOWN_SENT] = "SHUTDOWN_SENT",
[SCTP_CONNTRACK_SHUTDOWN_RECD] = "SHUTDOWN_RECD",
[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = "SHUTDOWN_ACK_SENT",
};
static const uint8_t sctp_states[] = {
SCTP_CONNTRACK_NONE,
SCTP_CONNTRACK_CLOSED,
SCTP_CONNTRACK_COOKIE_WAIT,
SCTP_CONNTRACK_COOKIE_ECHOED,
SCTP_CONNTRACK_ESTABLISHED,
SCTP_CONNTRACK_SHUTDOWN_SENT,
SCTP_CONNTRACK_SHUTDOWN_RECD,
SCTP_CONNTRACK_SHUTDOWN_ACK_SENT,
};
static const struct nfct_filter_ipv4 filter_ipv4 = {
.addr = __constant_htonl(INADDR_LOOPBACK),
.mask = 0xffffffff,
};
static const struct nfct_filter_ipv6 filter_ipv6 = {
.addr = { 0x0, 0x0, 0x0, 0x1 },
.mask = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff },
};
static void signal_handler(int number)
{
switch (number) {
case SIGINT:
case SIGQUIT:
case SIGTERM:
sigint = 1;
break;
case SIGHUP:
default:
break;
}
}
static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct);
static void flow_entry_get_extended(struct flow_entry *n);
static void help(void)
{
printf("\nflowtop %s, top-like netfilter TCP/UDP/SCTP/.. flow tracking\n",
VERSION_STRING);
puts("http:https://www.netsniff-ng.org\n\n"
"Usage: flowtop [options]\n"
"Options:\n"
" -4|--ipv4 Show only IPv4 flows (default)\n"
" -6|--ipv6 Show only IPv6 flows (default)\n"
" -T|--tcp Show only TCP flows (default)\n"
" -U|--udp Show only UDP flows\n"
" -D|--dccp Show only DCCP flows\n"
" -I|--icmp Show only ICMP/ICMPv6 flows\n"
" -S|--sctp Show only SCTP flows\n"
" -s|--show-src Also show source, not only dest\n"
" -u|--update Update GeoIP databases\n"
" -v|--version Print version and exit\n"
" -h|--help Print this help and exit\n\n"
"Examples:\n"
" flowtop\n"
" flowtop -46UTDISs\n\n"
"Note:\n"
" If netfilter is not running, you can activate it with e.g.:\n"
" iptables -A INPUT -p tcp -m state --state ESTABLISHED -j ACCEPT\n"
" iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT\n\n");
puts(copyright);
die();
}
static void version(void)
{
printf("\nflowtop %s, Git id: %s\n", VERSION_LONG, GITVERSION);
puts("top-like netfilter TCP/UDP/SCTP/.. flow tracking\n"
"http:https://www.netsniff-ng.org\n\n");
puts(copyright);
die();
}
static inline struct flow_entry *flow_entry_xalloc(void)
{
return xzmalloc(sizeof(struct flow_entry));
}
static inline void flow_entry_xfree(struct flow_entry *n)
{
xfree(n);
}
static inline void flow_list_init(struct flow_list *fl)
{
fl->head = NULL;
spinlock_init(&fl->lock);
}
static void flow_list_new_entry(struct flow_list *fl, struct nf_conntrack *ct)
{
struct flow_entry *n = flow_entry_xalloc();
flow_entry_from_ct(n, ct);
flow_entry_get_extended(n);
rcu_assign_pointer(n->next, fl->head);
rcu_assign_pointer(fl->head, n);
}
static struct flow_entry *flow_list_find_id(struct flow_list *fl,
uint32_t id)
{
struct flow_entry *n = rcu_dereference(fl->head);
while (n != NULL) {
if (n->flow_id == id)
return n;
n = rcu_dereference(n->next);
}
return NULL;
}
static struct flow_entry *flow_list_find_prev_id(struct flow_list *fl,
uint32_t id)
{
struct flow_entry *n = rcu_dereference(fl->head), *tmp;
if (n->flow_id == id)
return NULL;
while ((tmp = rcu_dereference(n->next)) != NULL) {
if (tmp->flow_id == id)
return n;
n = tmp;
}
return NULL;
}
static void flow_list_update_entry(struct flow_list *fl,
struct nf_conntrack *ct)
{
int do_ext = 0;
struct flow_entry *n;
n = flow_list_find_id(fl, nfct_get_attr_u32(ct, ATTR_ID));
if (n == NULL) {
n = flow_entry_xalloc();
do_ext = 1;
}
flow_entry_from_ct(n, ct);
if (do_ext) {
flow_entry_get_extended(n);
rcu_assign_pointer(n->next, fl->head);
rcu_assign_pointer(fl->head, n);
}
}
static void flow_list_destroy_entry(struct flow_list *fl,
struct nf_conntrack *ct)
{
struct flow_entry *n1, *n2;
uint32_t id = nfct_get_attr_u32(ct, ATTR_ID);
n1 = flow_list_find_id(fl, id);
if (n1) {
n2 = flow_list_find_prev_id(fl, id);
if (n2) {
rcu_assign_pointer(n2->next, n1->next);
n1->next = NULL;
flow_entry_xfree(n1);
} else {
flow_entry_xfree(fl->head);
fl->head = NULL;
}
}
}
static void flow_list_destroy(struct flow_list *fl)
{
struct flow_entry *n;
while (fl->head != NULL) {
n = rcu_dereference(fl->head->next);
fl->head->next = NULL;
flow_entry_xfree(fl->head);
rcu_assign_pointer(fl->head, n);
}
synchronize_rcu();
spinlock_destroy(&fl->lock);
}
static int walk_process(unsigned int pid, struct flow_entry *n)
{
int ret;
DIR *dir;
struct dirent *ent;
char path[1024];
if (snprintf(path, sizeof(path), "/proc/%u/fd", pid) == -1)
panic("giant process name! %u\n", pid);
dir = opendir(path);
if (!dir)
return 0;
while ((ent = readdir(dir))) {
struct stat statbuf;
if (snprintf(path, sizeof(path), "/proc/%u/fd/%s",
pid, ent->d_name) < 0)
continue;
if (stat(path, &statbuf) < 0)
continue;
if (S_ISSOCK(statbuf.st_mode) && (ino_t) n->inode == statbuf.st_ino) {
memset(n->cmdline, 0, sizeof(n->cmdline));
snprintf(path, sizeof(path), "/proc/%u/exe", pid);
ret = readlink(path, n->cmdline,
sizeof(n->cmdline) - 1);
if (ret < 0)
panic("readlink error: %s\n", strerror(errno));
n->procnum = pid;
closedir(dir);
return 1;
}
}
closedir(dir);
return 0;
}
static void walk_processes(struct flow_entry *n)
{
int ret;
DIR *dir;
struct dirent *ent;
/* n->inode must be set */
if (n->inode <= 0) {
memset(n->cmdline, 0, sizeof(n->cmdline));
return;
}
dir = opendir("/proc");
if (!dir)
panic("Cannot open /proc!\n");
while ((ent = readdir(dir))) {
const char *name = ent->d_name;
char *end;
unsigned int pid = strtoul(name, &end, 10);
/* not a PID */
if (pid == 0 && end == name)
continue;
ret = walk_process(pid, n);
if (ret > 0)
break;
}
closedir(dir);
}
static int get_port_inode(uint16_t port, int proto, int is_ip6)
{
int ret = -ENOENT;
char path[128], buff[1024];
FILE *proc;
memset(path, 0, sizeof(path));
snprintf(path, sizeof(path), "/proc/net/%s%s",
l4proto2str[proto], is_ip6 ? "6" : "");
proc = fopen(path, "r");
if (!proc)
return -EIO;
memset(buff, 0, sizeof(buff));
while (fgets(buff, sizeof(buff), proc) != NULL) {
int inode = 0;
unsigned int lport = 0;
buff[sizeof(buff) - 1] = 0;
if (sscanf(buff, "%*u: %*X:%X %*X:%*X %*X %*X:%*X %*X:%*X "
"%*X %*u %*u %u", &lport, &inode) == 2) {
if ((uint16_t) lport == port) {
ret = inode;
break;
}
}
memset(buff, 0, sizeof(buff));
}
fclose(proc);
return ret;
}
#define CP_NFCT(elem, attr, x) \
do { n->elem = nfct_get_attr_u##x(ct,(attr)); } while (0)
#define CP_NFCT_BUFF(elem, attr) do { \
const uint8_t *buff = nfct_get_attr(ct,(attr)); \
if (buff != NULL) \
memcpy(n->elem, buff, sizeof(n->elem)); \
} while (0)
static void flow_entry_from_ct(struct flow_entry *n, struct nf_conntrack *ct)
{
CP_NFCT(l3_proto, ATTR_ORIG_L3PROTO, 8);
CP_NFCT(l4_proto, ATTR_ORIG_L4PROTO, 8);
CP_NFCT(ip4_src_addr, ATTR_ORIG_IPV4_SRC, 32);
CP_NFCT(ip4_dst_addr, ATTR_ORIG_IPV4_DST, 32);
CP_NFCT(port_src, ATTR_ORIG_PORT_SRC, 16);
CP_NFCT(port_dst, ATTR_ORIG_PORT_DST, 16);
CP_NFCT(status, ATTR_STATUS, 32);
CP_NFCT(tcp_state, ATTR_TCP_STATE, 8);
CP_NFCT(tcp_flags, ATTR_TCP_FLAGS_ORIG, 8);
CP_NFCT(sctp_state, ATTR_SCTP_STATE, 8);
CP_NFCT(dccp_state, ATTR_DCCP_STATE, 8);
CP_NFCT(counter_pkts, ATTR_ORIG_COUNTER_PACKETS, 64);
CP_NFCT(counter_bytes, ATTR_ORIG_COUNTER_BYTES, 64);
CP_NFCT(timestamp_start, ATTR_TIMESTAMP_START, 64);
CP_NFCT(timestamp_stop, ATTR_TIMESTAMP_STOP, 64);
CP_NFCT(flow_id, ATTR_ID, 32);
CP_NFCT(use, ATTR_USE, 32);
CP_NFCT_BUFF(ip6_src_addr, ATTR_ORIG_IPV6_SRC);
CP_NFCT_BUFF(ip6_dst_addr, ATTR_ORIG_IPV6_DST);
n->port_src = ntohs(n->port_src);
n->port_dst = ntohs(n->port_dst);
n->ip4_src_addr = ntohl(n->ip4_src_addr);
n->ip4_dst_addr = ntohl(n->ip4_dst_addr);
}
enum flow_entry_direction {
flow_entry_src,
flow_entry_dst,
};
static inline int flow_entry_get_extended_is_dns(struct flow_entry *n)
{
/* We don't want to analyze / display DNS itself, since we
* use it to resolve reverse dns.
*/
return n->port_src == 53 || n->port_dst == 53;
}
#define SELFLD(dir,src_member,dst_member) \
(((dir) == flow_entry_src) ? n->src_member : n->dst_member)
static void flow_entry_get_sain4_obj(struct flow_entry *n,
enum flow_entry_direction dir,
struct sockaddr_in *sa)
{
memset(sa, 0, sizeof(*sa));
sa->sin_family = PF_INET;
sa->sin_addr.s_addr = htonl(SELFLD(dir, ip4_src_addr, ip4_dst_addr));
}
static void flow_entry_get_sain6_obj(struct flow_entry *n,
enum flow_entry_direction dir,
struct sockaddr_in6 *sa)
{
memset(sa, 0, sizeof(*sa));
sa->sin6_family = PF_INET6;
memcpy(&sa->sin6_addr, SELFLD(dir, ip6_src_addr, ip6_dst_addr),
sizeof(sa->sin6_addr));
}
static void
flow_entry_geo_city_lookup_generic(struct flow_entry *n,
enum flow_entry_direction dir)
{
struct sockaddr_in sa4;
struct sockaddr_in6 sa6;
const char *city = NULL;
switch (n->l3_proto) {
default:
bug();
case AF_INET:
flow_entry_get_sain4_obj(n, dir, &sa4);
city = geoip4_city_name(&sa4);
break;
case AF_INET6:
flow_entry_get_sain6_obj(n, dir, &sa6);
city = geoip6_city_name(&sa6);
break;
}
bug_on(sizeof(n->city_src) != sizeof(n->city_dst));
if (city) {
memcpy(SELFLD(dir, city_src, city_dst), city,
min(sizeof(n->city_src), strlen(city)));
} else {
memset(SELFLD(dir, city_src, city_dst), 0,
sizeof(n->city_src));
}
}
static void
flow_entry_geo_country_lookup_generic(struct flow_entry *n,
enum flow_entry_direction dir)
{
struct sockaddr_in sa4;
struct sockaddr_in6 sa6;
const char *country = NULL;
switch (n->l3_proto) {
default:
bug();
case AF_INET:
flow_entry_get_sain4_obj(n, dir, &sa4);
country = geoip4_country_name(&sa4);
break;
case AF_INET6:
flow_entry_get_sain6_obj(n, dir, &sa6);
country = geoip6_country_name(&sa6);
break;
}
bug_on(sizeof(n->country_src) != sizeof(n->country_dst));
if (country) {
memcpy(SELFLD(dir, country_src, country_dst), country,
min(sizeof(n->country_src), strlen(country)));
} else {
memset(SELFLD(dir, country_src, country_dst), 0,
sizeof(n->country_src));
}
}
static void flow_entry_get_extended_geo(struct flow_entry *n,
enum flow_entry_direction dir)
{
flow_entry_geo_city_lookup_generic(n, dir);
flow_entry_geo_country_lookup_generic(n, dir);
}
static void flow_entry_get_extended_revdns(struct flow_entry *n,
enum flow_entry_direction dir)
{
size_t sa_len;
struct sockaddr_in sa4;
struct sockaddr_in6 sa6;
struct sockaddr *sa;
struct hostent *hent;
switch (n->l3_proto) {
default:
bug();
case AF_INET:
flow_entry_get_sain4_obj(n, dir, &sa4);
sa = (struct sockaddr *) &sa4;
sa_len = sizeof(sa4);
hent = gethostbyaddr(&sa4.sin_addr, sizeof(sa4.sin_addr), AF_INET);
break;
case AF_INET6:
flow_entry_get_sain6_obj(n, dir, &sa6);
sa = (struct sockaddr *) &sa6;
sa_len = sizeof(sa6);
hent = gethostbyaddr(&sa6.sin6_addr, sizeof(sa6.sin6_addr), AF_INET6);
break;
}
bug_on(sizeof(n->rev_dns_src) != sizeof(n->rev_dns_dst));
getnameinfo(sa, sa_len, SELFLD(dir, rev_dns_src, rev_dns_dst),
sizeof(n->rev_dns_src), NULL, 0, NI_NUMERICHOST);
if (hent) {
memset(n->rev_dns_dst, 0, sizeof(n->rev_dns_dst));
memcpy(SELFLD(dir, rev_dns_src, rev_dns_dst),
hent->h_name, min(sizeof(n->rev_dns_src),
strlen(hent->h_name)));
}
}
static void flow_entry_get_extended(struct flow_entry *n)
{
if (n->flow_id == 0 || flow_entry_get_extended_is_dns(n))
return;
flow_entry_get_extended_revdns(n, flow_entry_src);
flow_entry_get_extended_geo(n, flow_entry_src);
flow_entry_get_extended_revdns(n, flow_entry_dst);
flow_entry_get_extended_geo(n, flow_entry_dst);
/* Lookup application */
n->inode = get_port_inode(n->port_src, n->l4_proto,
n->l3_proto == AF_INET6);
if (n->inode > 0)
walk_processes(n);
}
static uint16_t presenter_get_port(uint16_t src, uint16_t dst, int tcp)
{
if (src < dst && src < 1024) {
return src;
} else if (dst < src && dst < 1024) {
return dst;
} else {
const char *tmp1, *tmp2;
if (tcp) {
tmp1 = lookup_port_tcp(src);
tmp2 = lookup_port_tcp(dst);
} else {
tmp1 = lookup_port_udp(src);
tmp2 = lookup_port_udp(dst);
}
if (tmp1 && !tmp2) {
return src;
} else if (!tmp1 && tmp2) {
return dst;
} else {
if (src < dst)
return src;
else
return dst;
}
}
}
static void presenter_screen_do_line(WINDOW *screen, struct flow_entry *n,
unsigned int *line)
{
char tmp[128], *pname = NULL;
uint16_t port;
mvwprintw(screen, *line, 2, "");
/* PID, application name */
if (n->procnum > 0) {
slprintf(tmp, sizeof(tmp), "%s(%d)", basename(n->cmdline),
n->procnum);
printw("[");
attron(COLOR_PAIR(3));
printw("%s", tmp);
attroff(COLOR_PAIR(3));
printw("]:");
}
/* L3 protocol, L4 protocol, states */
printw("%s:%s", l3proto2str[n->l3_proto], l4proto2str[n->l4_proto]);
printw("[");
attron(COLOR_PAIR(3));
switch (n->l4_proto) {
case IPPROTO_TCP:
printw("%s", tcp_state2str[n->tcp_state]);
break;
case IPPROTO_SCTP:
printw("%s", sctp_state2str[n->sctp_state]);
break;
case IPPROTO_DCCP:
printw("%s", dccp_state2str[n->dccp_state]);
break;
case IPPROTO_UDP:
case IPPROTO_UDPLITE:
case IPPROTO_ICMP:
case IPPROTO_ICMPV6:
printw("NOSTATE");
break;
}
attroff(COLOR_PAIR(3));
printw("]");
/* Guess application port */
switch (n->l4_proto) {
case IPPROTO_TCP:
port = presenter_get_port(n->port_src, n->port_dst, 1);
pname = lookup_port_tcp(port);
break;
case IPPROTO_UDP:
case IPPROTO_UDPLITE:
port = presenter_get_port(n->port_src, n->port_dst, 0);
pname = lookup_port_udp(port);
break;
}
if (pname) {
attron(A_BOLD);
printw(":%s", pname);
attroff(A_BOLD);
}
printw(" ->");
/* Number packets, bytes */
if (n->counter_pkts > 0 && n->counter_bytes > 0)
printw(" (%"PRIu64" pkts, %"PRIu64" bytes) ->",
n->counter_pkts, n->counter_bytes);
/* Show source information: reverse DNS, port, country, city */
if (show_src) {
attron(COLOR_PAIR(1));
mvwprintw(screen, ++(*line), 8, "src: %s", n->rev_dns_src);
attroff(COLOR_PAIR(1));
printw(":%"PRIu16, n->port_src);
if (n->country_src[0]) {
printw(" (");
attron(COLOR_PAIR(4));
printw("%s", n->country_src);
attroff(COLOR_PAIR(4));
if (n->city_src[0])
printw(", %s", n->city_src);
printw(")");
}
printw(" => ");
}
/* Show dest information: reverse DNS, port, country, city */
attron(COLOR_PAIR(2));
mvwprintw(screen, ++(*line), 8, "dst: %s", n->rev_dns_dst);
attroff(COLOR_PAIR(2));
printw(":%"PRIu16, n->port_dst);
if (n->country_dst[0]) {
printw(" (");
attron(COLOR_PAIR(4));
printw("%s", n->country_dst);
attroff(COLOR_PAIR(4));
if (n->city_dst[0])
printw(", %s", n->city_dst);
printw(")");
}
}
static inline int presenter_flow_wrong_state(struct flow_entry *n, int state)
{
int ret = 1;
switch (n->l4_proto) {
case IPPROTO_TCP:
if (n->tcp_state == state)
ret = 0;
break;
case IPPROTO_SCTP:
if (n->sctp_state == state)
ret = 0;
break;
case IPPROTO_DCCP:
if (n->dccp_state == state)
ret = 0;
break;
case IPPROTO_UDP:
case IPPROTO_UDPLITE:
case IPPROTO_ICMP:
case IPPROTO_ICMPV6:
ret = 0;
break;
}
return ret;
}
static void presenter_screen_update(WINDOW *screen, struct flow_list *fl,
int skip_lines)
{
int maxy;
size_t i, j;
unsigned int line = 3;
struct flow_entry *n;
uint8_t protocols[] = {
IPPROTO_TCP,
IPPROTO_DCCP,
IPPROTO_SCTP,
IPPROTO_UDP,
IPPROTO_UDPLITE,
IPPROTO_ICMP,
IPPROTO_ICMPV6,
};
size_t protocol_state_size[] = {
[IPPROTO_TCP] = array_size(tcp_states),
[IPPROTO_DCCP] = array_size(dccp_states),
[IPPROTO_SCTP] = array_size(sctp_states),
[IPPROTO_UDP] = 1,
[IPPROTO_UDPLITE] = 1,
[IPPROTO_ICMP] = 1,
[IPPROTO_ICMPV6] = 1,
};
curs_set(0);
maxy = getmaxy(screen);
maxy -= 6;
start_color();
init_pair(1, COLOR_RED, COLOR_BLACK);
init_pair(2, COLOR_BLUE, COLOR_BLACK);
init_pair(3, COLOR_YELLOW, COLOR_BLACK);
init_pair(4, COLOR_GREEN, COLOR_BLACK);
wclear(screen);
clear();
mvwprintw(screen, 1, 2, "Kernel netfilter flows for %s%s%s%s%s%s"
"[+%d]", what & INCLUDE_TCP ? "TCP, " : "" ,
what & INCLUDE_UDP ? "UDP, " : "",
what & INCLUDE_SCTP ? "SCTP, " : "",
what & INCLUDE_DCCP ? "DCCP, " : "",
what & INCLUDE_ICMP && what & INCLUDE_IPV4 ? "ICMP, " : "",
what & INCLUDE_ICMP && what & INCLUDE_IPV6 ? "ICMP6, " : "",
skip_lines);
rcu_read_lock();
if (rcu_dereference(fl->head) == NULL)
mvwprintw(screen, line, 2, "(No active sessions! "
"Is netfilter running?)");
for (i = 0; i < array_size(protocols); i++) {
for (j = 0; j < protocol_state_size[protocols[i]]; j++) {
n = rcu_dereference(fl->head);
while (n && maxy > 0) {
if (n->l4_proto != protocols[i] ||
presenter_flow_wrong_state(n, j) ||
presenter_get_port(n->port_src,
n->port_dst, 0) == 53) {
/* skip entry */
n = rcu_dereference(n->next);
continue;
}
if (skip_lines > 0) {
n = rcu_dereference(n->next);
skip_lines--;
continue;
}
presenter_screen_do_line(screen, n, &line);
line++;
maxy -= (2 + 1 * show_src);
n = rcu_dereference(n->next);
}
}
}
rcu_read_unlock();
wrefresh(screen);
refresh();
}
static void presenter(void)
{
int skip_lines = 0;
WINDOW *screen;
lookup_init_ports(PORTS_TCP);
lookup_init_ports(PORTS_UDP);
screen = screen_init(false);
rcu_register_thread();
while (!sigint) {
switch (getch()) {
case 'q':
sigint = 1;
break;
case KEY_UP:
case 'u':
case 'k':
skip_lines--;
if (skip_lines < 0)
skip_lines = 0;
break;
case KEY_DOWN:
case 'd':
case 'j':