131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*
|
|
* options.c:
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include "options.h"
|
|
|
|
options_t options;
|
|
|
|
char optstr[] = "+i:f:n:dhp";
|
|
|
|
/* Global options. */
|
|
|
|
void set_defaults() {
|
|
options.interface = "eth0";
|
|
options.filtercode = NULL;
|
|
options.netfilter = 0;
|
|
inet_aton("10.0.1.0", &options.netfilternet);
|
|
inet_aton("255.255.255.0", &options.netfiltermask);
|
|
options.dnsresolution = 1;
|
|
options.promiscuous = 0;
|
|
options.showbars = 1;
|
|
}
|
|
|
|
void die(char *msg) {
|
|
fprintf(stderr, msg);
|
|
exit(1);
|
|
}
|
|
|
|
void set_net_filter(char* arg) {
|
|
char* mask;
|
|
|
|
mask = strchr(arg, '/');
|
|
if (mask == NULL) {
|
|
die("Could not parse net/mask\n");
|
|
}
|
|
*mask = '\0';
|
|
mask++;
|
|
if (inet_aton(arg, &options.netfilternet) == 0)
|
|
die("Invalid network address\n");
|
|
/* Accept a netmask like /24 or /255.255.255.0. */
|
|
if (!mask[strspn(mask, "0123456789")]) {
|
|
int n;
|
|
n = atoi(mask);
|
|
if (n > 32)
|
|
die("Invalid netmask");
|
|
else {
|
|
uint32_t mm = 0xffffffffl;
|
|
mm >>= n;
|
|
options.netfiltermask.s_addr = htonl(~mm);
|
|
}
|
|
} else if (inet_aton(mask, &options.netfiltermask) == 0)
|
|
die("Invalid netmask\n");
|
|
|
|
options.netfilter = 1;
|
|
|
|
}
|
|
|
|
/* usage:
|
|
* Print usage information. */
|
|
void usage(FILE *fp) {
|
|
fprintf(fp,
|
|
"iftop: display bandwidth usage on an interface by host\n"
|
|
"\n"
|
|
"Synopsis: iftop -h | [-d] [-p] [-i interface] [-f filter code] [-n net/mask]\n"
|
|
"\n"
|
|
" -h display this message\n"
|
|
" -d don't do hostname lookups\n"
|
|
" -p run in promiscuous mode (show traffic between other\n"
|
|
" hosts on the same network segment)\n"
|
|
" -i interface listen on named interface (default: eth0)\n"
|
|
" -f filter code use filter code to select packets to count\n"
|
|
" (default: none, but only IP packets are counted)\n"
|
|
" -n network/netmask show traffic flows in/out of network\n"
|
|
"\n"
|
|
"iftop, version " IFTOP_VERSION " copyright (c) 2002 Paul Warren <pdw@ex-parrot.com>\n"
|
|
);
|
|
}
|
|
|
|
void options_read(int argc, char **argv) {
|
|
int opt;
|
|
|
|
set_defaults();
|
|
|
|
opterr = 0;
|
|
while ((opt = getopt(argc, argv, optstr)) != -1) {
|
|
switch (opt) {
|
|
case 'h':
|
|
usage(stdout);
|
|
exit(0);
|
|
|
|
case 'd':
|
|
options.dnsresolution = 0;
|
|
break;
|
|
|
|
case 'i':
|
|
options.interface = optarg;
|
|
break;
|
|
|
|
case 'f':
|
|
options.filtercode = optarg;
|
|
break;
|
|
|
|
case 'p':
|
|
options.promiscuous = 1;
|
|
break;
|
|
|
|
case 'n':
|
|
set_net_filter(optarg);
|
|
break;
|
|
|
|
case '?':
|
|
fprintf(stderr, "iftop: unknown option -%c\n", optopt);
|
|
usage(stderr);
|
|
exit(1);
|
|
|
|
case ':':
|
|
fprintf(stderr, "iftop: option -%c requires an argument\n", optopt);
|
|
usage(stderr);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
}
|