create raw socket

main.c

@@ -1,18 +1,23 @@
+#define _DEFAULT_SOURCE
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <net/ethernet.h>
+#include <linux/if_packet.h>
+#include <linux/if_arp.h>
 
 typedef uint8_t mac_t[6];
 
-void parse_mac(const char* str, mac_t mac)
-{
+void parse_mac(const char* str, mac_t mac) {
     char* s = strdup(str);
     char* octet = strtok(s, ":");
     int i = 0;
     
-    while (octet != NULL && i < 6)
-    {
+    while (octet != NULL && i < 6) {
         mac[i++] = strtol(octet, NULL, 16);
 
         octet = strtok(NULL, ":");
@@ -21,11 +26,27 @@ void parse_mac(const char* str, mac_t mac)
     free(s);
 }
 
-int main()
-{
-    mac_t t;
-    parse_mac("11:22:33:44:55:66", t);
-    printf("%x\n", t[5]);
+int main(int argc, char** argv) {
+    // ifname hostMAC gatewayMAC targetMAC
+
+    mac_t host, gateway, target;
+    parse_mac(argv[2], host);
+    parse_mac(argv[3], gateway);
+    parse_mac(argv[4], target);
+
+    int raw = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+    if (raw < 0) {
+        perror("socket");
+        return 1;
+    }
+    setsockopt(raw, SOL_SOCKET, SO_BINDTODEVICE, argv[1], strlen(argv[1]));
+
+    // test receive
+    while (1) {
+        uint8_t packet[1500];
+        ssize_t rd = recv(raw, packet, 1500, 0);
+        printf("%lu\n", rd);
+    }
 
     return 0;
 }