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#include "mfrules.h"
#include "alloc.h"
#include "byte.h"
#include "case.h"
#include "cdbread.h"
#include "close.h"
#include "open.h"
#include "str.h"
#include "stralloc.h"
/* return -9: problems reading cdb */
/* return -1: key matches; data not */
/* return 0: no key */
/* return 1: key matches without data */
/* return 2: key and data match */
stralloc key = {0};
static struct cdb cdb;
static int mffind(char *mf)
{
char *x;
char *data;
unsigned int datalen;
int plus = 0;
int dlen;
int len;
int mflen;
int delta;
switch (cdb_find(&cdb, key.s, key.len)) {
case -1: return -9;
case 0: return 0;
}
datalen = cdb_datalen(&cdb);
data = alloc(datalen);
if (!data) return -9;
if (!datalen) return 1;
mflen = str_len(mf);
if (cdb_read(&cdb, data, datalen, cdb_datapos(&cdb)) == -1) {
alloc_free(data);
return -9;
}
x = data;
dlen = datalen - 1; /* trailing separator */
while (dlen > 0) {
plus = byte_rchr(data, dlen, '+');
x = data + plus + 1;
len = dlen - plus;
delta = (mflen > len) ? mflen - len : 0;
if (!byte_diff(x, len, mf + delta)) {
alloc_free(data);
return 2;
}
dlen = plus - 1;
}
alloc_free(data);
return -1;
}
int mfsearch(char *ip, char *host, char *info, char *mf)
{
int r;
if (info) {
if (!stralloc_copys(&key, info)) return -9;
r = mffind(mf);
if (r < -1 || r > 0) return r;
if (!stralloc_cats(&key, "@")) return -9;
if (!stralloc_cats(&key, ip)) return -9;
r = mffind(mf);
if (r < -1 || r > 0) return r;
if (host) {
if (!stralloc_copys(&key, info)) return -9;
if (!stralloc_cats(&key, "@=")) return -9;
if (!stralloc_cats(&key, host)) return -9;
r = mffind(mf);
if (r < -1 || r > 0) return r;
}
}
if (!stralloc_copys(&key, ip)) return -9;
r = mffind(mf);
if (r < -1 || r > 0) return r;
if (host) {
if (!stralloc_copys(&key, "=")) return -9;
if (!stralloc_cats(&key, host)) return -9;
r = mffind(mf);
if (r < -1 || r > 0) return r;
}
if (!stralloc_copys(&key, ip)) return -9; /* IPv6 */
while (key.len > 0) {
if (ip[key.len - 1] == ':') {
r = mffind(mf);
if (r < -1 || r > 0) return r;
}
--key.len;
}
if (!stralloc_copys(&key, ip)) return -9; /* IPv4 */
while (key.len > 0) {
if (ip[key.len - 1] == '.') {
r = mffind(mf);
if (r < -1 || r > 0) return r;
}
--key.len;
}
if (host) {
while (*host) {
if (*host == '.') {
if (!stralloc_copys(&key, "=")) return -9;
if (!stralloc_cats(&key, host)) return -9;
r = mffind(mf);
if (r < -1 || r > 0) return r;
}
++host;
}
if (!stralloc_copys(&key, "=")) return -9;
r = mffind(mf);
if (r < -1 || r > 0) return r;
}
key.len = 0;
/* return mffind(mf); */
return -1;
}
int mfrules(int fd, char *ip, char *host, char *info, char *mf)
{
int r;
cdb_init(&cdb, fd);
case_lowers(mf);
r = mfsearch(ip, host, info, mf);
cdb_free(&cdb);
close(fd);
return r;
}
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