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73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
22 years ago
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#include "stralloc.h"
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#include "case.h"
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#include "byte.h"
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#include "str.h"
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#include "dns.h"
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static int doit(stralloc *work,const char *rule)
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{
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char ch;
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unsigned int colon;
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unsigned int prefixlen;
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ch = *rule++;
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if ((ch != '?') && (ch != '=') && (ch != '*') && (ch != '-')) return 1;
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colon = str_chr(rule,':');
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if (!rule[colon]) return 1;
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if (work->len < colon) return 1;
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prefixlen = work->len - colon;
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if ((ch == '=') && prefixlen) return 1;
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if (case_diffb(rule,colon,work->s + prefixlen)) return 1;
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if (ch == '?') {
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if (byte_chr(work->s,prefixlen,'.') < prefixlen) return 1;
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if (byte_chr(work->s,prefixlen,':') < prefixlen) return 1;
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if (byte_chr(work->s,prefixlen,'[') < prefixlen) return 1;
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if (byte_chr(work->s,prefixlen,']') < prefixlen) return 1;
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}
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work->len = prefixlen;
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if (ch == '-') work->len = 0;
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return stralloc_cats(work,rule + colon + 1);
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}
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int dns_ip6_qualify_rules(stralloc *out,stralloc *fqdn,const stralloc *in,const stralloc *rules)
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{
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unsigned int i;
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unsigned int j;
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unsigned int plus;
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unsigned int fqdnlen;
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if (!stralloc_copy(fqdn,in)) return -1;
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for (j = i = 0;j < rules->len;++j)
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if (!rules->s[j]) {
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if (!doit(fqdn,rules->s + i)) return -1;
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i = j + 1;
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}
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fqdnlen = fqdn->len;
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plus = byte_chr(fqdn->s,fqdnlen,'+');
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if (plus >= fqdnlen)
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return dns_ip6(out,fqdn);
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i = plus + 1;
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for (;;) {
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j = byte_chr(fqdn->s + i,fqdnlen - i,'+');
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byte_copy(fqdn->s + plus,j,fqdn->s + i);
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fqdn->len = plus + j;
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if (dns_ip6(out,fqdn) == -1) return -1;
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if (out->len) return 0;
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i += j;
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if (i >= fqdnlen) return 0;
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++i;
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}
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}
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int dns_ip6_qualify(stralloc *out,stralloc *fqdn,const stralloc *in)
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{
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static stralloc rules;
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if (dns_resolvconfrewrite(&rules) == -1) return -1;
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return dns_ip6_qualify_rules(out,fqdn,in,&rules);
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}
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