Commit 5e6b69e0 authored by chris's avatar chris
Browse files

""

parent ab766160
......@@ -4,11 +4,16 @@
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include "iftop.h"
#include "options.h"
options_t options;
......@@ -17,8 +22,43 @@ char optstr[] = "+i:f:n:dhpb";
/* Global options. */
static char *get_first_interface(void) {
int s, size = 1;
struct ifreq *ifr;
struct ifconf ifc;
char *i = NULL;
/* Use if_nameindex(3) instead? */
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return NULL;
ifc.ifc_len = sizeof *ifr;
do {
++size;
ifc.ifc_req = xrealloc(ifc.ifc_req, size * sizeof *ifc.ifc_req);
ifc.ifc_len = size * sizeof *ifc.ifc_req;
if (ioctl(s, SIOCGIFCONF, &ifc) == -1) {
perror("SIOCGIFCONF");
return NULL;
}
} while (size * sizeof *ifc.ifc_req <= ifc.ifc_len);
/* Ugly. */
for (ifr = ifc.ifc_req; (char*)ifr < (char*)ifc.ifc_req + ifc.ifc_len; ++ifr) {
if (strcmp(ifr->ifr_name, "lo") != 0 && strncmp(ifr->ifr_name, "dummy", 5) != 0
&& ioctl(s, SIOCGIFFLAGS, ifr) == 0 && ifr->ifr_flags & IFF_UP) {
i = xstrdup(ifr->ifr_name);
break;
}
}
xfree(ifc.ifc_req);
return i;
}
static void set_defaults() {
options.interface = "eth0";
/* Should go through the list of interfaces, and find the first one which
* is up and is not lo or dummy*. */
options.interface = get_first_interface();
if (!options.interface)
options.interface = "eth0";
options.filtercode = NULL;
options.netfilter = 0;
inet_aton("10.0.1.0", &options.netfilternet);
......
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