#define TCPMS 30000
#define LOCALRESOURCEMS 20
-#define DNS_UDPPORT 53
+#define DNS_PORT 53
#define DNS_MAXUDP 512
#define DNS_MAXDOMAIN 255
#define DNS_HDRSIZE 12
#define DNS_CLASS_IN 1
+typedef enum {
+ rcode_noerror,
+ rcode_formaterror,
+ rcode_servfail,
+ rcode_nxdomain,
+ rcode_notimp,
+ rcode_refused
+} dns_rcode;
+
/* Shared data structures */
typedef union {
int dmaddr_index;
} qcontext;
+typedef struct {
+ adns_rrtype type;
+ int rrsz;
+ adns_status (*parse)(adns_state ads, adns_query qu, int serv, vbuf *vb,
+ const byte *dgram, int dglen, int cbyte, int max,
+ void *store_r);
+ /* Parse one RR, in dgram of length dglen, starting at cbyte and
+ * extending until at most max.
+ *
+ * The RR should be stored at *store_r, of length qu->typei->rrsz.
+ *
+ * If there is an overrun which might indicate truncation, it should set
+ * *rdstart to -1; otherwise it may set it to anything else positive.
+ *
+ * This function may use vb (which has been initialised) however it likes.
+ */
+} typeinfo;
+
struct adns__query {
/* FIXME: make sure this is all init'd properly */
enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
adns_query back, next, parent;
struct { adns_query head, tail; } children;
struct { adns_query back, next; } siblings;
- adns_rrtype type;
- vbuf ans;
+
+ const typeinfo *typei;
+
+#error make sure all this is init'd properly
+#error make sure all this is freed properly
+ byte *querymsg;
+ int querylen;
+
+ vbuf ansbuf; /* Used for answer RRs */
+ char *cname_str;
+ byte *cname_dgram;
+ int cname_dglen, cname_begin;
+
int id, flags, udpretries;
int udpnextserver;
unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
struct timeval timeout;
- byte *querymsg;
- int querylen;
qcontext context;
char owner[1];
/* After the owner name and nul comes the query message, pointed to by querymsg */
/* Possible states:
*
- * state Queue child id answer nextudpserver sentudp failedtcp
+ * state Queue child id ansbuf nextudpserver sentudp failedtcp
*
* udp NONE null >=0 null 0 zero zero
* udp timew null >=0 null any nonzero zero
void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
int serv, const char *fmt, va_list al);
-void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
-void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
-void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
+
+void adns__debug(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(3,4);
+void adns__warn(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(3,4);
+void adns__diag(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(3,4);
int adns__vbuf_ensure(vbuf *vb, int want);
+int adns__vbuf_appendstr(vbuf *vb, const char *data);
int adns__vbuf_append(vbuf *vb, const byte *data, int len);
/* 1=>success, 0=>realloc failed */
void adns__vbuf_appendq(vbuf *vb, const byte *data, int len);
/* From submit.c: */
void adns__query_nomem(adns_state ads, adns_query qu);
+void adns__query_finish(adns_state ads, adns_query qu, adns_status stat);
void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
/* From query.c: */
void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
- adns_rrtype type, adns_queryflags flags);
+ const typeinfo *typei, adns_queryflags flags);
/* From reply.c: */
-void adns__procdgram(adns_state ads, const byte *dgram, int len, int serv);
+void adns__procdgram(adns_state ads, const byte *dgram, int len,
+ int serv, struct timeval now);
+
+/* From types.c: */
+
+const typeinfo *adns__findtype(adns_rrtype type);
+
+/* From parse.c: */
+
+typedef struct {
+ adns_state ads, int serv;
+ const byte *dgram;
+ int dglen, max, cbyte, namelen;
+ int *dmend_rlater, *namelen_rlater;
+} findlabel_state;
+
+void adns__findlabel_start(findlabel_state *fls,
+ adns_state ads, int serv,
+ const byte *dgram, int dglen, int max,
+ int dmbegin, int *dmend_rlater);
+/* Finds labels in a domain in a datagram.
+ *
+ * Call this routine first.
+ * endpoint_rlater may be null.
+ */
+
+adns_status adns__findlabel_next(findlabel_state *fls,
+ int *lablen_r, int *labstart_r);
+/* Then, call this one repeatedly.
+ *
+ * It will return adns_s_ok if all is well, and tell you the length
+ * and start of successive labels. labstart_r may be null, but
+ * lablen_r must not be.
+ *
+ * After the last label, it will return with *lablen_r zero.
+ * Do not then call it again; instead, just throw away the findlabel_state.
+ *
+ * *dmend_rlater will have been set to point to the next part of
+ * the datagram after the label (or after the uncompressed part,
+ * if compression was used). *namelen_rlater will have been set
+ * to the length of the domain name (total length of labels plus
+ * 1 for each intervening dot).
+ *
+ * If the datagram appears to be truncated, *lablen_r will be -1.
+ * *dmend_rlater, *labstart_r and *namelen_r may contain garbage.
+ * Do not call _next again.
+ *
+ * There may also be errors, in which case *dmend_rlater,
+ * *namelen_rlater, *lablen_r and *labstart_r may contain garbage.
+ * Do not then call findlabel_next again.
+ */
+
+adns_status adns__parse_domain(adns_state ads, int serv, vbuf *vb,
+ const byte *dgram, int dglen,
+ int *cbyte_io, int max);
+/* vb must already have been initialised; it will be reset if necessary.
+ * If there is truncation, vb->used will be set to 0; otherwise
+ * (if there is no error) vb will be null-terminated.
+ * If there is an error vb and *cbyte_io may be left indeterminate.
+ */
+
+adns_status adns__findrr(adns_state ads, int serv,
+ const byte *dgram, int dglen, int *cbyte_io,
+ int *type_r, int *class_r, int *rdlen_r, int *rdstart_r,
+ const byte *eo_dgram, int eo_dglen, int eo_cbyte,
+ int *eo_matched_r);
+ /* Finds the extent and some of the contents of an RR in a datagram
+ * and does some checks. The datagram is *dgram, length dglen, and
+ * the RR starts at *cbyte_io (which is updated afterwards to point
+ * to the end of the RR).
+ *
+ * The type, class and RRdata length and start are returned iff
+ * the corresponding pointer variables are not null. type_r and
+ * class_r may not be null.
+ *
+ * If the caller thinks they know what the owner of the RR ought to
+ * be they can pass in details in eo_*: this is another (or perhaps
+ * the same datagram), and a pointer to where the putative owner
+ * starts in that datagram. In this case *eo_matched_r will be set
+ * to 1 if the datagram matched or 0 if it did not. Either
+ * both eo_dgram and eo_matched_r must both be non-null, or they
+ * must both be null (in which case eo_dglen and eo_cbyte will be ignored).
+ * The eo datagram and contained owner domain MUST be valid and
+ * untruncated.
+ *
+ * If there is truncation then *type_r will be set to -1 and
+ * *cbyte_io, *class_r, *rdlen_r, *rdstart_r and *eo_matched_r will be
+ * undefined.
+ *
+ * If an error is returned then *type_r will be undefined too.
+ */
+
+int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len);
/* From event.c: */
static inline int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; }
static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
+static inline int ctype_alpha(int c) {
+ return (c >= 'a' && c <= 'z') || (c >= 'A' || c <= 'Z');
+}
/* Useful macros */
#define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
#define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)
+#define GETIL_B(cb) (dgram[(cb)++])
+#define GET_B(cb,tv) ((tv)= GETIL_B((cb)))
+#define GET_W(cb,tv) ((tv)=0, (tv)|=(GETIL_B((cb))<<8), (tv)|=GETIL_B(cb), (tv))
+
#endif
~ianmdlvl / adns.git / blobdiff