/*
* iftop.c:
*
*/
#include "integers.h"
#if defined(HAVE_PCAP_H)
# include <pcap.h>
#elif defined(HAVE_PCAP_PCAP_H)
# include <pcap/pcap.h>
#else
# error No pcap.h
#endif
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <pthread.h>
#include <curses.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include "iftop.h"
#include "addr_hash.h"
#include "resolver.h"
#include "ui.h"
#include "options.h"
#ifdef DLT_LINUX_SLL
#include "sll.h"
#endif /* DLT_LINUX_SLL */
#include "threadprof.h"
#include "ether.h"
#include "ip.h"
#include "tcp.h"
#include "token.h"
#include "llc.h"
#include "extract.h"
#include "ethertype.h"
#include "cfgfile.h"
#include "ppp.h"
/* ethernet address of interface. */
int have_hw_addr = 0;
unsigned char if_hw_addr[6];
/* IP address of interface */
int have_ip_addr = 0;
struct in_addr if_ip_addr;
extern options_t options;
hash_type* history;
history_type history_totals;
time_t last_timestamp;
int history_pos = 0;
int history_len = 1;
pthread_mutex_t tick_mutex;
pcap_t* pd; /* pcap descriptor */
struct bpf_program pcap_filter;
pcap_handler packet_handler;
sig_atomic_t foad;
static void finish(int sig) {
foad = sig;
}
/* Only need ethernet (plus optional 4 byte VLAN) and IP headers (48) + first 2 bytes of tcp/udp header */
#define CAPTURE_LENGTH 72
void init_history() {
history = addr_hash_create();
last_timestamp = time(NULL);
memset(&history_totals, 0, sizeof history_totals);
}
history_type* history_create() {
history_type* h;
h = xcalloc(1, sizeof *h);
return h;
}
void history_rotate() {
hash_node_type* n = NULL;
history_pos = (history_pos + 1) % HISTORY_LENGTH;
hash_next_item(history, &n);
while(n != NULL) {
hash_node_type* next = n;
history_type* d = (history_type*)n->rec;
hash_next_item(history, &next);
if(d->last_write == history_pos) {
addr_pair key = *(addr_pair*)(n->key);
hash_delete(history, &key);
free(d);
}
else {
d->recv[history_pos] = 0;
d->sent[history_pos] = 0;
}
n = next;
}
history_totals.sent[history_pos] = 0;
history_totals.recv[history_pos] = 0;
if(history_len < HISTORY_LENGTH) {
history_len++;
}
}
void tick(int print) {
time_t t;
pthread_mutex_lock(&tick_mutex);
t = time(NULL);
if(t - last_timestamp >= RESOLUTION) {
//printf("TICKING\n");
analyse_data();
ui_print();
history_rotate();
last_timestamp = t;
}
else {
ui_tick(print);
}
pthread_mutex_unlock(&tick_mutex);
}
int in_filter_net(struct in_addr addr) {
int ret;
ret = ((addr.s_addr & options.netfiltermask.s_addr) == options.netfilternet.s_addr);
return ret;
}
int ip_addr_match(struct in_addr addr) {
return addr.s_addr == if_ip_addr.s_addr;
}
/**
* Creates an addr_pair from an ip (and tcp/udp) header, swapping src and dst
* if required
*/
void assign_addr_pair(addr_pair* ap, struct ip* iptr, int flip) {
unsigned short int src_port = 0;
unsigned short int dst_port = 0;
/* Does this protocol use ports? */
if(iptr->ip_p == IPPROTO_TCP || iptr->ip_p == IPPROTO_UDP) {
/* We take a slight liberty here by treating UDP the same as TCP */
/* Find the TCP/UDP header */
struct tcphdr* thdr = ((void*)iptr) + IP_HL(iptr) * 4;
src_port = ntohs(thdr->th_sport);
dst_port = ntohs(thdr->th_dport);
}
if(flip == 0) {
ap->src = iptr->ip_src;
ap->src_port = src_port;
ap->dst = iptr->ip_dst;
ap->dst_port = dst_port;
}
else {
ap->src = iptr->ip_dst;
ap->src_port = dst_port;
ap->dst = iptr->ip_src;
ap->dst_port = src_port;
}
}
static void handle_ip_packet(struct ip* iptr, int hw_dir)
{
int direction = 0; /* incoming */
history_type* ht;
union {
history_type **ht_pp;
void **void_pp;
} u_ht = { &ht };
addr_pair ap;
int len;
if(options.netfilter == 0) {
/*
* Net filter is off, so assign direction based on MAC address
*/
if(hw_dir == 1) {
/* Packet leaving this interface. */
assign_addr_pair(&ap, iptr, 0);
direction = 1;
}
else if(hw_dir == 0) {
/* Packet incoming */
assign_addr_pair(&ap, iptr, 1);
direction = 0;
}
/* Packet direction is not given away by h/ware layer. Try IP
* layer
*/
else if(have_ip_addr && ip_addr_match(iptr->ip_src)) {
/* outgoing */
assign_addr_pair(&ap, iptr, 0);
direction = 1;
}
else if(have_ip_addr && ip_addr_match(iptr->ip_dst)) {
/* incoming */
assign_addr_pair(&ap, iptr, 1);
direction = 0;
}
/*
* Cannot determine direction from hardware or IP levels. Therefore
* assume that it was a packet between two other machines, assign
* source and dest arbitrarily (by numerical value) and account as
* incoming.
*/
else if (options.promiscuous_but_choosy) {
return; /* junk it */
}
else if(iptr->ip_src.s_addr < iptr->ip_dst.s_addr) {
assign_addr_pair(&ap, iptr, 1);
direction = 0;
}
else {
assign_addr_pair(&ap, iptr, 0);
direction = 0;
}
}
else {
/*
* Net filter on, assign direction according to netmask
*/
if(in_filter_net(iptr->ip_src) && !in_filter_net(iptr->ip_dst)) {
/* out of network */
assign_addr_pair(&ap, iptr, 0);
direction = 1;
}
else if(in_filter_net(iptr->ip_dst) && !in_filter_net(iptr->ip_src)) {
/* into network */
assign_addr_pair(&ap, iptr, 1);
direction = 0;
}
else {
/* drop packet */
return ;
}
}
ap.protocol = iptr->ip_p;
/* Add the addresses to be resolved */
resolve(&iptr->ip_dst, NULL, 0);
resolve(&iptr->ip_src, NULL, 0);
if(hash_find(history, &ap, u_ht.void_pp) == HASH_STATUS_KEY_NOT_FOUND) {
ht = history_create();
hash_insert(history, &ap, ht);
}
len = ntohs(iptr->ip_len);
/* Update record */
ht->last_write = history_pos;
if(iptr->ip_src.s_addr == ap.src.s_addr) {
ht->sent[history_pos] += len;
ht->total_sent += len;
}
else {
ht->recv[history_pos] += len;
ht->total_recv += len;
}
if(direction == 0) {
/* incoming */
history_totals.recv[history_pos] += len;
history_totals.total_recv += len;
}
else {
history_totals.sent[history_pos] += len;
history_totals.total_sent += len;
}
}
static void handle_raw_packet(unsigned char* args, const struct pcap_pkthdr* pkthdr, const unsigned char* packet)
{
handle_ip_packet((struct ip*)packet, -1);
}
static void handle_llc_packet(const struct llc* llc, int dir) {
struct ip* ip = (struct ip*)((void*)llc + sizeof(struct llc));
/* Taken from tcpdump/print-llc.c */
if(llc->ssap == LLCSAP_SNAP && llc->dsap == LLCSAP_SNAP
&& llc->llcui == LLC_UI) {
u_int32_t orgcode;
register u_short et;
orgcode = EXTRACT_24BITS(&llc->llc_orgcode[0]);
et = EXTRACT_16BITS(&llc->llc_ethertype[0]);
switch(orgcode) {
case OUI_ENCAP_ETHER:
case OUI_CISCO_90:
handle_ip_packet(ip, dir);
break;
case OUI_APPLETALK:
if(et == ETHERTYPE_ATALK) {
handle_ip_packet(ip, dir);
}
break;
default:;
/* Not a lot we can do */
}
}
}
static void handle_tokenring_packet(unsigned char* args, const struct pcap_pkthdr* pkthdr, const unsigned char* packet)
{
struct token_header *trp;
int dir = -1;
trp = (struct token_header *)packet;
if(IS_SOURCE_ROUTED(trp)) {
packet += RIF_LENGTH(trp);
}
packet += TOKEN_HDRLEN;
if(memcmp(trp->token_shost, if_hw_addr, 6) == 0 ) {
/* packet leaving this i/f */
dir = 1;
}
else if(memcmp(trp->token_dhost, if_hw_addr, 6) == 0 || memcmp("\xFF\xFF\xFF\xFF\xFF\xFF", trp->token_dhost, 6) == 0) {
/* packet entering this i/f */
dir = 0;
}
/* Only know how to deal with LLC encapsulated packets */
if(FRAME_TYPE(trp) == TOKEN_FC_LLC) {
handle_llc_packet((struct llc*)packet, dir);
}
}
static void handle_ppp_packet(unsigned char* args, const struct pcap_pkthdr* pkthdr, const unsigned char* packet)
{
register u_int length = pkthdr->len;
register u_int caplen = pkthdr->caplen;
u_int proto;
if (caplen < 2)
return;
if(packet[0] == PPP_ADDRESS) {
if (caplen < 4)
return;
packet += 2;
length -= 2;
proto = EXTRACT_16BITS(packet);
packet += 2;
length -= 2;
if(proto == PPP_IP || proto == ETHERTYPE_IP) {
handle_ip_packet((struct ip*)packet, -1);
}
}
}
#ifdef DLT_LINUX_SLL
static void handle_cooked_packet(unsigned char *args, const struct pcap_pkthdr * thdr, const unsigned char * packet)
{
struct sll_header *sptr;
int dir = -1;
sptr = (struct sll_header *) packet;
switch (ntohs(sptr->sll_pkttype))
{
case LINUX_SLL_HOST:
/*entering this interface*/
dir = 0;
break;
case LINUX_SLL_OUTGOING:
/*leaving this interface */
dir=1;
break;
}
handle_ip_packet((struct ip*)(packet+SLL_HDR_LEN), dir);
}
#endif /* DLT_LINUX_SLL */
static void handle_eth_packet(unsigned char* args, const struct pcap_pkthdr* pkthdr, const unsigned char* packet)
{
struct ether_header *eptr;
int ether_type;
const unsigned char *payload;
eptr = (struct ether_header*)packet;
ether_type = ntohs(eptr->ether_type);
payload = packet + sizeof(struct ether_header);
tick(0);
if(ether_type == ETHERTYPE_8021Q) {
struct vlan_8021q_header* vptr;
vptr = (struct vlan_8021q_header*)payload;
ether_type = ntohs(vptr->ether_type);
payload += sizeof(struct vlan_8021q_header);
}
if(ether_type == ETHERTYPE_IP) {
struct ip* iptr;
int dir = -1;
/*
* Is a direction implied by the MAC addresses?
*/
if(have_hw_addr && memcmp(eptr->ether_shost, if_hw_addr, 6) == 0 ) {
/* packet leaving this i/f */
dir = 1;
}
else if(have_hw_addr && memcmp(eptr->ether_dhost, if_hw_addr, 6) == 0 ) {
/* packet entering this i/f */
dir = 0;
}
else if (memcmp("\xFF\xFF\xFF\xFF\xFF\xFF", eptr->ether_dhost, 6) == 0) {
/* broadcast packet, count as incoming */
dir = 0;
}
iptr = (struct ip*)(payload); /* alignment? */
handle_ip_packet(iptr, dir);
}
}
/* set_filter_code:
* Install some filter code. Returns NULL on success or an error message on
* failure. */
char *set_filter_code(const char *filter) {
char *x;
if (filter) {
x = xmalloc(strlen(filter) + sizeof "() and ip");
sprintf(x, "(%s) and ip", filter);
} else
x = xstrdup("ip");
if (pcap_compile(pd, &pcap_filter, x, 1, 0) == -1) {
xfree(x);
return pcap_geterr(pd);
}
xfree(x);
if (pcap_setfilter(pd, &pcap_filter) == -1)
return pcap_geterr(pd);
else
return NULL;
}
/*
* packet_init:
*
* performs pcap initialisation, called before ui is initialised
*/
void packet_init() {
char errbuf[PCAP_ERRBUF_SIZE];
char *m;
int s;
int i;
int dlt;
int result;
#ifdef HAVE_DLPI
result = get_addrs_dlpi(options.interface, if_hw_addr, &if_ip_addr);
#else
result = get_addrs_ioctl(options.interface, if_hw_addr, &if_ip_addr);
#endif
if (result < 0) {
exit(1);
}
have_hw_addr = result & 1;
have_ip_addr = result & 2;
if(have_ip_addr) {
fprintf(stderr, "IP address is: %s\n", inet_ntoa(if_ip_addr));
}
if(have_hw_addr) {
fprintf(stderr, "MAC address is:");
for (i = 0; i < 6; ++i)
fprintf(stderr, "%c%02x", i ? ':' : ' ', (unsigned int)if_hw_addr[i]);
fprintf(stderr, "\n");
}
// exit(0);
resolver_initialise();
pd = pcap_open_live(options.interface, CAPTURE_LENGTH, options.promiscuous, 1000, errbuf);
// DEBUG: pd = pcap_open_offline("tcpdump.out", errbuf);
if(pd == NULL) {
fprintf(stderr, "pcap_open_live(%s): %s\n", options.interface, errbuf);
exit(1);
}
dlt = pcap_datalink(pd);
if(dlt == DLT_EN10MB) {
packet_handler = handle_eth_packet;
}
else if(dlt == DLT_RAW || dlt == DLT_NULL) {
packet_handler = handle_raw_packet;
}
else if(dlt == DLT_IEEE802) {
packet_handler = handle_tokenring_packet;
}
else if(dlt == DLT_PPP) {
packet_handler = handle_ppp_packet;
}
/*
* SLL support not available in older libpcaps
*/
#ifdef DLT_LINUX_SLL
else if(dlt == DLT_LINUX_SLL) {
packet_handler = handle_cooked_packet;
}
#endif
else {
fprintf(stderr, "Unsupported datalink type: %d\n"
"Please email pdw@ex-parrot.com, quoting the datalink type and what you were\n"
"trying to do at the time\n.", dlt);
exit(1);
}
if ((m = set_filter_code(options.filtercode))) {
fprintf(stderr, "set_filter_code: %s\n", m);
exit(1);
return;
}
}
/* packet_loop:
* Worker function for packet capture thread. */
void packet_loop(void* ptr) {
pcap_loop(pd,-1,(pcap_handler)packet_handler,NULL);
}
/* main:
* Entry point. See usage(). */
int main(int argc, char **argv) {
pthread_t thread;
struct sigaction sa = {};
/* TODO: tidy this up */
/* read command line options and config file */
config_init();
options_set_defaults();
options_read_args(argc, argv);
/* If a config was explicitly specified, whinge if it can't be found */
read_config(options.config_file, options.config_file_specified);
options_make();
sa.sa_handler = finish;
sigaction(SIGINT, &sa, NULL);
pthread_mutex_init(&tick_mutex, NULL);
packet_init();
init_history();
ui_init();
pthread_create(&thread, NULL, (void*)&packet_loop, NULL);
ui_loop();
pthread_cancel(thread);
ui_finish();
return 0;
}
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>