diff options
| -rw-r--r-- | src/network.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/src/network.c b/src/network.c index 122676d..bb2d395 100644 --- a/src/network.c +++ b/src/network.c @@ -1,5 +1,6 @@ #include "junk/network.h" #include <arpa/inet.h> +#include <linux/if_link.h> #include <net/if.h> #include <errno.h> #include <linux/if_arp.h> @@ -14,6 +15,7 @@ #include <sys/socket.h> #include <sys/types.h> #include <unistd.h> +#include <ifaddrs.h> #define TAG "network" @@ -156,7 +158,26 @@ int eth_arp_send(int sockfd, arp_packet *packet) { memset(&addrinfo, 0, sizeof addrinfo); addrinfo.sll_family = AF_PACKET; addrinfo.sll_protocol = htonl(ETH_P_ARP); - addrinfo.sll_ifindex = if_nametoindex("enp6s0"); + struct ifaddrs *ifaddr; + if (getifaddrs(&ifaddr) == -1) { + perror("getifaddrs"); + } + + for (struct ifaddrs* ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { + if (ifa->ifa_addr == NULL) { + continue; + } + int family = ifa->ifa_addr->sa_family; + if (family == AF_PACKET) { + struct sockaddr_ll* hwaddr = (struct sockaddr_ll*)ifa->ifa_addr; + if (memcmp(hwaddr->sll_addr, packet->sender_hardware_address, 6) == 0) { + fprintf(stderr, "Found intf ifindex %d\n", hwaddr->sll_ifindex); + addrinfo.sll_ifindex = hwaddr->sll_ifindex; + } + } + } + + addrinfo.sll_hatype = htonl(ARPHRD_ETHER); addrinfo.sll_pkttype = PACKET_BROADCAST; addrinfo.sll_halen = 6; |