You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
23 years ago
|
#include "stralloc.h"
|
||
|
|
#include "case.h"
|
||
|
|
#include "byte.h"
|
||
|
|
#include "str.h"
|
||
|
|
#include "dns.h"
|
||
|
|
|
||
|
|
static int doit(stralloc *work,const char *rule)
|
||
|
|
{
|
||
|
|
char ch;
|
||
|
|
unsigned int colon;
|
||
|
|
unsigned int prefixlen;
|
||
|
|
|
||
|
|
ch = *rule++;
|
||
|
|
if ((ch != '?') && (ch != '=') && (ch != '*') && (ch != '-')) return 1;
|
||
|
|
colon = str_chr(rule,':');
|
||
|
|
if (!rule[colon]) return 1;
|
||
|
|
|
||
|
|
if (work->len < colon) return 1;
|
||
|
|
prefixlen = work->len - colon;
|
||
|
|
if ((ch == '=') && prefixlen) return 1;
|
||
|
|
if (case_diffb(rule,colon,work->s + prefixlen)) return 1;
|
||
|
|
if (ch == '?') {
|
||
|
|
if (byte_chr(work->s,prefixlen,'.') < prefixlen) return 1;
|
||
|
|
if (byte_chr(work->s,prefixlen,'[') < prefixlen) return 1;
|
||
|
|
if (byte_chr(work->s,prefixlen,']') < prefixlen) return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
work->len = prefixlen;
|
||
|
|
if (ch == '-') work->len = 0;
|
||
|
|
return stralloc_cats(work,rule + colon + 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
int dns_ip4_qualify_rules(stralloc *out,stralloc *fqdn,const stralloc *in,const stralloc *rules)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
unsigned int j;
|
||
|
|
unsigned int plus;
|
||
|
|
unsigned int fqdnlen;
|
||
|
|
|
||
|
|
if (!stralloc_copy(fqdn,in)) return -1;
|
||
|
|
|
||
|
|
for (j = i = 0;j < rules->len;++j)
|
||
|
|
if (!rules->s[j]) {
|
||
|
|
if (!doit(fqdn,rules->s + i)) return -1;
|
||
|
|
i = j + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
fqdnlen = fqdn->len;
|
||
|
|
plus = byte_chr(fqdn->s,fqdnlen,'+');
|
||
|
|
if (plus >= fqdnlen)
|
||
|
|
return dns_ip4(out,fqdn);
|
||
|
|
|
||
|
|
i = plus + 1;
|
||
|
|
for (;;) {
|
||
|
|
j = byte_chr(fqdn->s + i,fqdnlen - i,'+');
|
||
|
|
byte_copy(fqdn->s + plus,j,fqdn->s + i);
|
||
|
|
fqdn->len = plus + j;
|
||
|
|
if (dns_ip4(out,fqdn) == -1) return -1;
|
||
|
|
if (out->len) return 0;
|
||
|
|
i += j;
|
||
|
|
if (i >= fqdnlen) return 0;
|
||
|
|
++i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int dns_ip4_qualify(stralloc *out,stralloc *fqdn,const stralloc *in)
|
||
|
|
{
|
||
|
|
static stralloc rules;
|
||
|
|
if (dns_resolvconfrewrite(&rules) == -1) return -1;
|
||
|
|
return dns_ip4_qualify_rules(out,fqdn,in,&rules);
|
||
|
|
}
|