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authorHenryk Plötz <henryk@ploetzli.ch>2014-10-03 19:58:52 +0200
committerHenryk Plötz <henryk@ploetzli.ch>2014-10-03 19:58:52 +0200
commit0e5b2871ca6456b01d4bf037a6e68badf1ff1a41 (patch)
tree97b95b74c9618d85da9aa9451a55a819cd7b1c2e /dns_ipq.c
downloadtinydnssec-0e5b2871ca6456b01d4bf037a6e68badf1ff1a41.tar.gz
tinydnssec-0e5b2871ca6456b01d4bf037a6e68badf1ff1a41.tar.bz2
Initial commit of djbdns-1.05.tar.gz
Source was http://cr.yp.to/djbdns/djbdns-1.05.tar.gz, SHA1 2efdb3a039d0c548f40936aa9cb30829e0ce8c3d
Diffstat (limited to 'dns_ipq.c')
-rw-r--r--dns_ipq.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/dns_ipq.c b/dns_ipq.c
new file mode 100644
index 0000000..5b65e23
--- /dev/null
+++ b/dns_ipq.c
@@ -0,0 +1,71 @@
+#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);
+}