#include <asl_core.h>
#include <stdlib.h>
#include <string.h>
#include <membership.h>
#include <pthread.h>
static uint64_t _asl_core_msg_next_id = 1;
static pthread_mutex_t msg_id_lock = PTHREAD_MUTEX_INITIALIZER;
#define mix(a, b, c) \
{ \
a -= b; a -= c; a ^= (c>>13); \
b -= c; b -= a; b ^= (a<< 8); \
c -= a; c -= b; c ^= (b>>13); \
a -= b; a -= c; a ^= (c>>12); \
b -= c; b -= a; b ^= (a<<16); \
c -= a; c -= b; c ^= (b>> 5); \
a -= b; a -= c; a ^= (c>> 3); \
b -= c; b -= a; b ^= (a<<10); \
c -= a; c -= b; c ^= (b>>15); \
}
uint32_t
asl_core_string_hash(const char *s, uint32_t inlen)
{
uint32_t a, b, c, l, len;
if (s == NULL) return 0;
l = inlen;
if (l == 0)
{
if (s[0] == '\0') return 0;
l = strlen(s);
}
len = l;
a = b = 0x9e3779b9;
c = 0;
while (len >= 12)
{
a += (s[0] + ((uint32_t)s[1]<<8) + ((uint32_t)s[ 2]<<16) + ((uint32_t)s[ 3]<<24));
b += (s[4] + ((uint32_t)s[5]<<8) + ((uint32_t)s[ 6]<<16) + ((uint32_t)s[ 7]<<24));
c += (s[8] + ((uint32_t)s[9]<<8) + ((uint32_t)s[10]<<16) + ((uint32_t)s[11]<<24));
mix(a, b, c);
s += 12;
len -= 12;
}
c += l;
switch(len)
{
case 11: c += ((uint32_t)s[10]<<24);
case 10: c += ((uint32_t)s[9]<<16);
case 9 : c += ((uint32_t)s[8]<<8);
case 8 : b += ((uint32_t)s[7]<<24);
case 7 : b += ((uint32_t)s[6]<<16);
case 6 : b += ((uint32_t)s[5]<<8);
case 5 : b += s[4];
case 4 : a += ((uint32_t)s[3]<<24);
case 3 : a += ((uint32_t)s[2]<<16);
case 2 : a += ((uint32_t)s[1]<<8);
case 1 : a += s[0];
}
mix(a, b, c);
if (c == 0) c = 1;
return c;
}
const char *
asl_core_error(uint32_t code)
{
switch (code)
{
case ASL_STATUS_OK: return "Operation Succeeded";
case ASL_STATUS_INVALID_ARG: return "Invalid Argument";
case ASL_STATUS_INVALID_STORE: return "Invalid Data Store";
case ASL_STATUS_INVALID_STRING: return "Invalid String";
case ASL_STATUS_INVALID_ID: return "Invalid ID Number";
case ASL_STATUS_INVALID_MESSAGE: return "Invalid Message";
case ASL_STATUS_NOT_FOUND: return "Not Found";
case ASL_STATUS_READ_FAILED: return "Read Operation Failed";
case ASL_STATUS_WRITE_FAILED: return "Write Operation Failed";
case ASL_STATUS_NO_MEMORY: return "System Memory Allocation Failed";
case ASL_STATUS_ACCESS_DENIED: return "Access Denied";
case ASL_STATUS_READ_ONLY: return "Read Only Access";
case ASL_STATUS_WRITE_ONLY: return "Write Only Access";
case ASL_STATUS_MATCH_FAILED: return "Match Failed";
case ASL_STATUS_NO_RECORDS: return "No More Records";
}
return "Operation Failed";
}
static uint32_t
asl_core_check_user_access(int32_t msgu, int32_t readu)
{
if (msgu == -1) return ASL_STATUS_OK;
if (msgu == readu) return ASL_STATUS_OK;
return ASL_STATUS_ACCESS_DENIED;
}
static uint32_t
asl_core_check_group_access(int32_t msgg, int32_t readu, int32_t readg)
{
int check;
uuid_t uu, gu;
if (msgg == -1) return ASL_STATUS_OK;
if (msgg == readg) return ASL_STATUS_OK;
mbr_uid_to_uuid(readu, uu);
mbr_gid_to_uuid(msgg, gu);
check = 0;
mbr_check_membership(uu, gu, &check);
if (check != 0) return ASL_STATUS_OK;
return ASL_STATUS_ACCESS_DENIED;
}
uint32_t
asl_core_check_access(int32_t msgu, int32_t msgg, int32_t readu, int32_t readg, uint16_t flags)
{
uint16_t uset, gset;
if (readu == 0) return ASL_STATUS_OK;
uset = flags & ASL_MSG_FLAG_READ_UID_SET;
gset = flags & ASL_MSG_FLAG_READ_GID_SET;
if ((uset | gset) == 0) return ASL_STATUS_OK;
if ((uset != 0) && (gset == 0)) return asl_core_check_user_access(msgu, readu);
if ((uset == 0) && (gset != 0)) return asl_core_check_group_access(msgg, readu, readg);
if ((asl_core_check_user_access(msgu, readu)) == ASL_STATUS_OK) return ASL_STATUS_OK;
return asl_core_check_group_access(msgg, readu, readg);
}
uint64_t
asl_core_htonq(uint64_t n)
{
#ifdef __BIG_ENDIAN__
return n;
#else
u_int32_t t;
union
{
u_int64_t q;
u_int32_t l[2];
} x;
x.q = n;
t = x.l[0];
x.l[0] = htonl(x.l[1]);
x.l[1] = htonl(t);
return x.q;
#endif
}
uint64_t
asl_core_ntohq(uint64_t n)
{
#ifdef __BIG_ENDIAN__
return n;
#else
u_int32_t t;
union
{
u_int64_t q;
u_int32_t l[2];
} x;
x.q = n;
t = x.l[0];
x.l[0] = ntohl(x.l[1]);
x.l[1] = ntohl(t);
return x.q;
#endif
}
uint64_t
asl_core_new_msg_id(uint64_t start)
{
uint64_t out;
pthread_mutex_lock(&msg_id_lock);
if (start != 0) _asl_core_msg_next_id = start;
out = _asl_core_msg_next_id;
_asl_core_msg_next_id++;
pthread_mutex_unlock(&msg_id_lock);
return out;
}
char *
asl_core_encode_buffer(const char *in, uint32_t len)
{
char *str;
uint32_t i, j, k, outlen, breakit, min, hist[256];
uint32_t lfu[2], save[2];
uint8_t v;
if (in == NULL) return NULL;
if (len == 0) return NULL;
memset(hist, 0, sizeof(hist));
save[0] = 0;
save[1] = 0;
for (i = 0; i < len; i++)
{
v = in[i];
hist[v]++;
}
for (j = 0; j < 2; j++)
{
lfu[j] = 1;
min = hist[1];
for (i = 2; i < 256; i++)
{
if (hist[i] < min)
{
lfu[j] = i;
min = hist[i];
if (min == 0) break;
if ((j == 1) && (min == save[0])) break;
}
}
save[j] = hist[lfu[j]];
hist[lfu[j]] = (uint32_t)-1;
}
outlen = 2 + len + save[0] + save[1] + 1;
str = malloc(outlen);
if (str == NULL) return NULL;
str[outlen - 1] = '\0';
str[0] = lfu[0];
str[1] = lfu[1];
j = 2;
for (i = 0; i < len; i++)
{
v = in[i];
if (v == 0)
{
str[j++] = lfu[0];
continue;
}
breakit = 0;
for (k = 0; (k < 2) && (breakit == 0); k++)
{
if (v == lfu[k])
{
str[j++] = lfu[1];
str[j++] = k + 1;
breakit = 1;
}
}
if (breakit == 1) continue;
str[j++] = v;
}
return str;
}
int32_t
asl_core_decode_buffer(const char *in, char **buf, uint32_t *len)
{
uint8_t v;
uint32_t i, j, n, outlen;
uint32_t lfu[2];
char *out;
if (buf == NULL) return -1;
if (len == NULL) return -1;
lfu[0] = in[0];
lfu[1] = in[1];
outlen = 0;
n = strlen(in);
for (i = 2; i < n; i++)
{
if (in[i] == lfu[1])
{
if ((i + 1) == n) return -1;
i++;
if ((in[i] < 1) || (in[i] > 2)) return -1;
outlen++;
}
else outlen++;
}
if (outlen == 0) return -1;
out = malloc(outlen);
if (out == NULL) return -1;
j = 0;
for (i = 2; i < n; i++)
{
v = in[i];
if (v == lfu[0])
{
out[j++] = 0;
}
else if (v == lfu[1])
{
i++;
v = in[i];
out[j++] = lfu[v - 1];
}
else out[j++] = v;
}
*len = outlen;
*buf = out;
return 0;
}