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#include "config.h"
#include "ipenc.h"
#include "panon.h"
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#ifndef HAVE_STRLCPY
static size_t strlcpy(char *dest, const char *src, size_t size)
{
size_t ret;
for(ret=0;src[ret] && ret<size; ret++) {
dest[ret]=src[ret];
}
dest[ret++]='\0';
return ret;
}
#endif
static enum enc_type_t enc_type = ENC_NONE;
static uint32_t masks[33] = {
0x00000000, 0x80000000, 0xC0000000, 0xe0000000, 0xf0000000,
0xf8000000, 0xfC000000, 0xfe000000, 0xff000000, 0xff800000,
0xffC00000, 0xffe00000, 0xfff00000, 0xfff80000, 0xfffC0000,
0xfffe0000, 0xffff0000, 0xffff8000, 0xffffC000, 0xffffe000,
0xfffff000, 0xfffff800, 0xfffffC00, 0xfffffe00, 0xffffff00,
0xffffff80, 0xffffffC0, 0xffffffe0, 0xfffffff0, 0xfffffff8,
0xfffffffC, 0xfffffffe, 0xffffffff,
};
static uint32_t prefix;
static uint32_t netmask;
static void init_prefix(const char *key)
{
int a,b,c,d;
int bits;
sscanf(key,"%i.%i.%i.%i/%i",
&a, &b, &c, &d, &bits);
prefix=(a<<24) + (b<<16) + (c<<8) + d;
assert(bits>=0 && bits<=32);
netmask = masks[bits];
}
static uint32_t prefix_substitute(uint32_t ip)
{
return (prefix & netmask) | (ip & ~netmask);
}
void enc_init(enum enc_type_t type, char *key)
{
char cryptopan_key[32];
memset(cryptopan_key,0,sizeof(cryptopan_key));
enc_type = type;
switch (enc_type) {
case ENC_NONE:
break;
case ENC_PREFIX_SUBSTITUTION:
init_prefix(key);
break;
case ENC_CRYPTOPAN:
strlcpy(cryptopan_key,key,sizeof(cryptopan_key));
panon_init(cryptopan_key);
break;
default:
assert(0 /* unknown encryption type */);
_exit(1);
}
}
uint32_t enc_ip(uint32_t orig_addr)
{
switch (enc_type) {
case ENC_NONE:
return orig_addr;
case ENC_PREFIX_SUBSTITUTION:
return prefix_substitute(orig_addr);
case ENC_CRYPTOPAN:
return cpp_anonymize(orig_addr);
default:
assert(0 /* unknown encryption type */);
_exit(1);
}
}
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