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#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<net/if.h>
static char *bad_interface_names[] = {
"lo:",
"lo",
"stf", /* pseudo-device 6to4 tunnel interface */
"gif", /* psuedo-device generic tunnel interface */
"dummy",
"vmnet",
NULL /* last entry must be NULL */
};
static int is_bad_interface_name(char *i) {
char **p;
for (p = bad_interface_names; *p; ++p)
if (strncmp(i, *p, strlen(*p)) == 0)
return 1;
return 0;
}
/* This finds the first interface which is up and is not the loopback
* interface or one of the interface types listed in bad_interface_names. */
static char *get_first_interface(void) {
struct if_nameindex * nameindex;
char *i = NULL;
int j = 0;
/* Use if_nameindex(3) instead? */
nameindex = if_nameindex();
if(nameindex == NULL) {
return NULL;
}
while(nameindex[j].if_index != 0) {
if (strcmp(nameindex[j].if_name, "lo") != 0 && !is_bad_interface_name(nameindex[j
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#include <stdlib.h>
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