diff options
Diffstat (limited to 'contrib/bind/named/ns_ncache.c')
| -rw-r--r-- | contrib/bind/named/ns_ncache.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/contrib/bind/named/ns_ncache.c b/contrib/bind/named/ns_ncache.c new file mode 100644 index 0000000..eb8faaf --- /dev/null +++ b/contrib/bind/named/ns_ncache.c @@ -0,0 +1,154 @@ +/************************************************************************** + * ns_ncache.c + * author: anant kumar + * last modification: March 17, 1993 + * + * implements negative caching + */ + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/file.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <syslog.h> +#include <errno.h> +#include <stdio.h> +#include <resolv.h> + +#include "named.h" + +#ifdef NCACHE + +void +cache_n_resp(msg, msglen) + u_char *msg; + int msglen; +{ + register struct databuf *dp; + HEADER *hp; + u_char *cp; + char dname[MAXDNAME]; + int n; + int type, class; + int Vcode; + int flags; + + nameserIncr(from_addr.sin_addr, nssRcvdNXD); + + hp = (HEADER *)msg; + cp = msg+HFIXEDSZ; + + n = dn_expand(msg, msg + msglen, cp, dname, sizeof dname); + if (n < 0) { + dprintf(1, (ddt, "Query expand name failed:cache_n_resp\n")); + hp->rcode = FORMERR; + return; + } + cp += n; + GETSHORT(type, cp); + GETSHORT(class, cp); + dprintf(1, (ddt, + "ncache: dname %s, type %d, class %d\n", + dname, type, class)); + +#ifdef VALIDATE + Vcode = validate(dname, dname, &from_addr, type, class, NULL, 0, + hp->rcode == NXDOMAIN ? NXDOMAIN : NOERROR_NODATA); + if (Vcode == INVALID || Vcode == VALID_NO_CACHE) { + /*Valid_no_cache should never occur but doesn't hurt to check*/ + return; + } +#endif +#ifdef RETURNSOA + if (hp->rcode==NXDOMAIN) { + u_int32_t ttl; + u_int16_t atype; + u_char * tp = cp; + u_char * cp1; + u_char data[BUFSIZ+MAXDNAME]; + int len = sizeof(data); + + /* store ther SOA record */ + if (!hp->nscount) { + dprintf(3, (ddt, "ncache: nscount == 0\n")); + return; + } + n = dn_skipname(tp, msg + msglen); + if (n < 0) { + dprintf(3, (ddt, "ncache: form error\n")); + return; + } + tp += n; + GETSHORT(atype,tp); /* type */ + if (atype != T_SOA) { + dprintf(3, (ddt, "ncache: type (%d) != T_SOA\n",atype)); + return; + } + tp += sizeof(u_int16_t); /* class */ + GETLONG(ttl,tp); /* ttl */ + tp += sizeof(u_int16_t); /* dlen */ + + if ((n = dn_expand(msg, msg + msglen, tp, data, len)) + < 0 ) { + dprintf(3, (ddt, "ncache: form error 2\n")); + return; + } /* origin */ + tp += n; + cp1 = data + (n = strlen(data) + 1); + len -= n; + if ((n = dn_expand(msg, msg + msglen, tp, cp1, len)) < 0 ) { + dprintf(3, (ddt, "ncache: form error 2\n")); + return; + } /* mail */ + tp += n; + n = strlen(cp1) + 1; + cp1 += n; + len -= n; + bcopy(tp, cp1, n = 5 * sizeof(u_int32_t)); + /* serial, refresh, retry, expire, min */ + cp1 += n; + len -= n; + /* store the zone of the soa record */ + if ((n = dn_expand(msg, msg + msglen, cp, cp1, len)) < 0 ) { + dprintf(3, (ddt, "ncache: form error 2\n")); + return; + } + n = strlen(cp1) + 1; + cp1 += n; + + dp = savedata(class, T_SOA, MIN(ttl,NTTL)+tt.tv_sec, data, + cp1 - data); + } else { +#endif + dp = savedata(class, type, NTTL+tt.tv_sec, NULL, 0); +#ifdef RETURNSOA + } +#endif + dp->d_zone = DB_Z_CACHE; + dp->d_cred = hp->aa ? DB_C_AUTH : DB_C_ANSWER; + dp->d_clev = 0; + if(hp->rcode == NXDOMAIN) { + dp->d_rcode = NXDOMAIN; + flags = DB_NODATA|DB_NOTAUTH|DB_NOHINTS; + } else { + dp->d_rcode = NOERROR_NODATA; + flags = DB_NOTAUTH|DB_NOHINTS; + } + + if ((n = db_update(dname,dp,dp,flags,hashtab)) != OK) { + dprintf(1, (ddt, + "db_update failed return value:%d, cache_n_resp()\n", + n)); + free((char *)dp); + return; + } + dprintf(4, (ddt, + "ncache succeeded: [%s %s %s] rcode:%d ttl:%ld\n", + dname, p_type(type), p_class(class), + dp->d_rcode, (long)(dp->d_ttl-tt.tv_sec))); + return; +} + +#endif /*NCACHE*/ |
