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#include <stdio.h>
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/if.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "util.h"
#include "nlapi.h"
static int callback(struct nlmsghdr *n, void *u) {
int (*cb)(int b, int index, unsigned short type, const char *name) = u;
if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
struct rtattr *a;
struct ifinfomsg *i;
char ifname[IFNAMSIZ+1];
int la;
i = NLMSG_DATA(n);
if (n->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) {
fprintf(stderr, "NETLINK: Packet too small or truncated! (2)\n");
return -1;
}
memset(&ifname, 0, sizeof(ifname));
a = (void*) i + NLMSG_ALIGN(sizeof(struct ifinfomsg));
la = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
while (RTA_OK(a, la)) {
if(a->rta_type == IFLA_IFNAME)
strncpy(ifname, RTA_DATA(a), MIN(RTA_PAYLOAD(a), IFNAMSIZ));
a = RTA_NEXT(a, la);
}
if (cb(n->nlmsg_type == RTM_NEWLINK, i->ifi_index, i->ifi_type, ifname[0] ? ifname : NULL) < 0)
return -1;
}
return 0;
}
int ifmonitor_init(int (*cb) (int b, int index, unsigned short type, const char *name)) {
return nlapi_register(callback, cb);
}
#if 0
int test(int b, int index, unsigned short type, const char * name) {
printf("CALLBACK %s %s %i %i\n", b ? "new" : "del", name, index, type);
return 0;
}
int main(int argc, char *argv[]) {
int r = 1;
if (nlapi_open(RTMGRP_LINK) < 0)
goto finish;
if (ifmonitor_init(test) < 0)
goto finish;
for (;;)
if (nlapi_work() < 0)
goto finish;
r = 0;
finish:
nlapi_close();
return r;
}
#endif
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