Is there a facility in C that can be used to send arp request?

CodeBlox

It would be great if IOCTLs could be used to send arp requests... I need to obtain the MAC address of a workstation on the local subnet given it's IP (the way arp works). IOCTL appears to allow you to query the arp cache but not actually send arp request... Should I just form the headers myself and send a request in my program and listen for the reply?


EDIT:
I suppose no need for this thread anymore... I was able to get that part sorted by coming up with the following code:

void recv_arp(char * dst_ip, int sock_des){


  unsigned char pdu[ETH_DATA_LEN];
  struct ethhdr * ethptr;
  struct arphdr * arpptr;
  struct in_addr addr;


  if(inet_pton(AF_INET, dst_ip, &addr) != 1)
    prog_err("recv_arp", true);
  
  while(true){


    recvfrom(sock_des, pdu, ETH_DATA_LEN, 0, NULL, NULL);
    
    ethptr = (struct ethhdr *)pdu;
    arpptr = (struct arphdr *)(pdu + ETH_HLEN);
    if(ethptr->h_proto == htons(ETHERTYPE_ARP) && arpptr->ar_op == htons(ARPOP_REPLY)){
      printf("This is an ARP datagram\n");
      if(!memcmp(arpptr->__ar_sip, &addr, PRO_HLEN)){
        printf("This is our reply\n");
    

      }
    }
  }


}

It works in listening for the reply and I can pull the MAC Address from it.