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/* reserved.c (adapted for trekhopd)
*
* Kevin P. Smith 7/3/89
*
*/
#include "config.h"
#include "copyright2.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include INC_NETINET_IN
#include "Wlib.h"
#include "defs.h"
#include "struct.h"
#include "data.h"
#include "packets.h"
#include "reserved.h"
#ifdef GATEWAY
extern unsigned LONG netaddr;
#endif
extern void terminate(int error);
void makeReservedPacket(struct reserved_spacket *packet)
{
int i;
for (i = 0; i < 16; i++)
{
packet->data[i] = RANDOM() % 256;
}
packet->type = SP_RESERVED;
}
/* A "random" table we use to hose our data. */
static unsigned char swap[16][16] =
{
{4, 13, 9, 7, 5, 8, 14, 2, 10, 11, 6, 3, 12, 15, 0, 1},
{0, 4, 12, 5, 15, 2, 7, 3, 14, 6, 1, 10, 8, 13, 11, 9},
{9, 5, 4, 2, 3, 6, 10, 12, 1, 7, 15, 14, 11, 0, 13, 8},
{5, 8, 15, 4, 6, 9, 1, 12, 10, 3, 13, 11, 2, 7, 0, 14},
{15, 13, 1, 14, 4, 0, 8, 12, 11, 9, 2, 10, 3, 6, 7, 5},
{6, 7, 9, 11, 14, 1, 4, 13, 2, 12, 8, 15, 10, 0, 5, 3},
{11, 0, 10, 14, 7, 12, 2, 4, 15, 13, 3, 9, 1, 5, 8, 6},
{9, 8, 2, 10, 12, 14, 3, 7, 4, 0, 11, 1, 5, 15, 6, 13},
{15, 12, 3, 0, 10, 8, 13, 9, 14, 2, 4, 5, 7, 6, 1, 11},
{14, 3, 0, 11, 2, 10, 15, 12, 13, 1, 5, 4, 6, 8, 7, 9},
{1, 2, 7, 3, 8, 0, 10, 14, 6, 5, 13, 12, 4, 9, 11, 15},
{2, 1, 11, 9, 7, 3, 12, 6, 5, 8, 0, 10, 14, 4, 15, 13},
{0, 12, 15, 1, 13, 7, 6, 5, 3, 14, 11, 8, 9, 10, 2, 4},
{10, 9, 0, 6, 1, 14, 5, 12, 7, 4, 15, 13, 8, 2, 3, 11},
{3, 11, 6, 12, 10, 5, 14, 1, 9, 15, 7, 2, 13, 8, 4, 0},
{12, 6, 5, 8, 14, 4, 13, 15, 10, 0, 11, 9, 3, 1, 7, 2}
};
void encryptReservedPacket(struct reserved_spacket *spacket, struct reserved_cpacket *cpacket, char *server, int pno)
{
struct sockaddr_in saddr;
unsigned char mixin1, mixin2, mixin3, mixin4, mixin5;
int i, j, k;
char buf[16];
unsigned char *s;
int len;
#ifndef GATEWAY
unsigned LONG netaddr = 0;
#endif
MCOPY(spacket->data, cpacket->data, 16);
MCOPY(spacket->data, cpacket->resp, 16);
cpacket->type = CP_RESERVED;
/* if we didn't get it from -H, go ahead and query the socket */
if (netaddr == 0)
{
len = sizeof(saddr);
if (getpeername(sock, (struct sockaddr *) &saddr, (socklen_t *) &len) < 0)
{
perror("getpeername(sock)");
terminate(1);
}
netaddr = saddr.sin_addr.s_addr;
}
/* printf("Verifying with netaddr %x\n", netaddr); */
mixin1 = (netaddr >> 24) & 0xff;
mixin2 = pno;
mixin3 = (netaddr >> 16) & 0xff;
mixin4 = (netaddr >> 8) & 0xff;
mixin5 = netaddr & 0xff;
j = 0;
for (i = 0; i < 23; i++)
{
j = (j + cpacket->resp[j]) & 15;
s = swap[j];
cpacket->resp[s[i % 7]] ^= mixin1;
cpacket->resp[s[i % 5]] ^= mixin2;
cpacket->resp[s[i % 13]] ^= mixin3;
cpacket->resp[s[i % 3]] ^= mixin4;
cpacket->resp[s[i % 11]] ^= mixin5;
for (k = 0; k < 16; k++)
{
buf[k] = cpacket->resp[s[k]];
}
MCOPY(buf, cpacket->resp, 16);
}
}
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