/* (c) 1998 Eduardo Marcelo Serrat

   Modifications (c) 1998 by Christine Caulfield to set the Ethernet address
                and  1999 to configure 2.3+ kernels
		and  2001 to set MAC address on all, or specified interfaces 
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <linux/sysctl.h>
#include <netdnet/dn.h>
#include <netdnet/dnetdb.h>
#include <netinet/in.h>
#include <features.h>    /* for the glibc version number */
#if (__GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || __GLIBC__ >= 3
#include <netpacket/packet.h>
#include <net/ethernet.h>     /* the L2 protocols */
#include <net/if_arp.h>
#include <linux/if.h>
#else
#include <asm/types.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>   /* The L2 protocols */
#endif


static int set_hwaddr(int argc, char *argv[]);

struct 
{
    char	devname[5]; 
    char	exec_addr[6]; 
} if_arg;

int force;
int hwaddr;

int main(int argc, char *argv[])
{
  	int sockfd;
  	int er;
	unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};

	char	*exec_dev;
	static  struct	dn_naddr	*binadr;

	argc--;
	argv++;
	while (argc)
	{
		if (!strcmp(argv[0], "-hw"))
			hwaddr = 1;
		else if (!strcmp(argv[0], "-f"))
			force = 1;
		else
			break;
		argc--;
		argv++;
	}

	if ((exec_dev=getexecdev()) == NULL)
	{
		printf("getexecdev: Invalid line in decnet.conf\n");
		exit (-1);
	}

	memcpy(&if_arg.devname,exec_dev,5);
	
	binadr=getnodeadd();
	if (binadr == NULL)
	{
		printf("dnet_addr: Invalid executor address in decnet.conf\n");
		exit (-1);
	}
	memcpy(&if_arg.exec_addr,dn_hiord_addr,6);
	if_arg.exec_addr[4]=binadr->a_addr[0];
	if_arg.exec_addr[5]=binadr->a_addr[1];


#ifdef SDF_UICPROXY 
#if 0	    
	// Steve's Kernel uses syctl
	{
	    int name[] = {CTL_NET, NET_DECNET, NET_DECNET_DEFAULT_DEVICE};
	    int *oldlen;
	    char address[256];
	    int status;
	    struct nodeent *node;

	    strcpy(address, dnet_ntoa(binadr));
	    node = getnodebyaddr((char*)binadr->a_addr,2 , AF_DECnet);
	    if (!node)
	    {
		fprintf(stderr, "Can't get executor name from address %s\n",
			address);
		return -1;
	    }
	    status = sysctl(name, 3, NULL, NULL,
			    exec_dev, strlen(exec_dev));
	    if (status) perror("sysctl(set exec dev)");

	    name[2] = NET_DECNET_NODE_ADDRESS;
	    status = sysctl(name, 3, NULL, NULL,
			    binadr->a_addr, 2);
	    if (status) perror("sysctl(set exec addr)");
    
	    name[2] = NET_DECNET_NODE_NAME;
	    status = sysctl(name, 3, NULL, NULL,
			    node->n_name, strlen(node->n_name));
	    if (status) perror("sysctl(set exec name)");
	}
#endif
#else
	// Eduardo's uses ioctl on an open socket
  	if ((sockfd=socket(AF_DECnet,SOCK_SEQPACKET,DNPROTO_NSP)) == -1) {
	    fprintf(stderr, "DECnet not supported in the kernel\n");
	    exit(-1);
  	}

	if ((er=ioctl(sockfd, SIOCSIFADDR, (unsigned long)&if_arg)) < 0) {
	    if (errno == EADDRINUSE)
		fprintf(stderr, "DECnet is already running\n");
	    else
		perror("ioctl");
	    close(sockfd);
	    exit(-1);
	}		
	
  	if ( close(sockfd) < 0)
	    perror("close");
#endif

        // Setting the hardware address is common to both
	if (hwaddr)
	{
	    return set_hwaddr(argc, argv);
	}
	return 0;
}


/* See if the current interface is one we need to change */
static int use_if(char *name, int argc, char *argv[])
{
    int i;
    
    if (argc == 0) return 1; /* Do em all */

    for (i=0; i<argc; i++)
	if (strcmp(name, argv[i]) == 0) return 1;

    return 0;
}

/* Change the MAC(hardware) address on specified(or all) ethernet
   interfaces */
static int set_hwaddr(int argc, char *argv[])
{
    struct ifconf ifc;
    struct ifreq *ifr;
    int numreqs = 30;
    int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    /* DECnet sockets don't allow DEV ioctls...tell Steve! */
    /*int sock = socket(AF_DECnet, SOCK_STREAM, DNPROTO_NSP); */
    int ifdone = 0;
    int ret = 0;
    int i;

    ifc.ifc_buf = NULL;
    do
    {
	ifc.ifc_len = sizeof(struct ifreq) * numreqs;
	ifc.ifc_buf = realloc(ifc.ifc_buf, ifc.ifc_len);

	if (ioctl(sock, SIOCGIFCONF, &ifc) < 0)
	{
	    fprintf(stderr, "Error getting interface list\n");
	    ifc.ifc_len = 0;
	    ret = errno;		
	    break;
	}

	numreqs += 10;
    }
    while (ifc.ifc_len == sizeof(struct ifreq) * numreqs);
    
    ifr = ifc.ifc_req;
    for (i = 0; i < ifc.ifc_len; i += sizeof(struct ifreq))
    {
	/* Only use ethernet interfaces */
	ioctl(sock, SIOCGIFHWADDR, ifr);
	if (ifr->ifr_hwaddr.sa_family == ARPHRD_ETHER)
	{
	    if (use_if(ifr->ifr_name, argc, argv))
	    {
		/* Down the interface so we can change the MAC address */
		ioctl(sock, SIOCGIFFLAGS, ifr);
		if (ifr->ifr_flags & IFF_UP && force)
		{
		    ifr->ifr_flags &= ~IFF_UP;
		    ioctl(sock, SIOCSIFFLAGS, ifr);
		}

		/* Need to refresh this */
		ioctl(sock, SIOCGIFHWADDR, ifr);

		/* Only change it if necessary */
		if (memcmp(ifr->ifr_hwaddr.sa_data, if_arg.exec_addr, 6))
		{
		    memcpy(ifr->ifr_hwaddr.sa_data, if_arg.exec_addr, 6);
		    /* Do the deed */
		    if (ioctl(sock, SIOCSIFHWADDR, ifr) < 0)
		    {
			fprintf(stderr, "Error setting hw address on %s: %s\n",
				ifr->ifr_name, strerror(errno));
			ret = errno;		
		    }
		}

		/* "UP" the interface. Just in case TCP/IP is not running */
		ioctl(sock, SIOCGIFFLAGS, ifr);		    
		ifr->ifr_flags |= IFF_UP;
		ioctl(sock, SIOCSIFFLAGS, ifr);
		    
		ifdone++;
	    }
	}	    

	ifr++;
    }

    /* If interfaces were specified and none were done then
       that's an error */
    if (!ifdone && argc)
    {
	fprintf(stderr, "No interfaces set for DECnet\n");
	ret = -1;
    }
    
    close(sock);
    return ret;
}