#define DNS_CLASS_IN 1
#define DNS_INADDR_ARPA "in-addr", "arpa"
+#define DNS_IP6_ARPA "ip6", "arpa"
#define MAX_POLLFDS ADNS_POLLFDS_RECOMMENDED
struct af_addr { int af; union gen_addr addr; };
+#define NREVDOMAINS 2 /* keep in sync with addrfam! */
+struct revparse_state {
+ unsigned map; /* which domains are still live */
+ byte ipv[NREVDOMAINS][32]; /* address components so far */
+};
+
union checklabel_state {
- struct { byte ipv[4]; } ptr;
+ struct revparse_state ptr;
};
typedef struct {
union {
struct {
+ adns_rrtype rev_rrtype;
struct af_addr addr;
} ptr;
} tinfo; /* type-specific state for the query itself: zero-init if you
/* Return the output resource-record element size; if this is null, then
* the rrsz member can be used.
*/
+
+ void (*query_send)(adns_query qu, struct timeval now);
+ /* Send the query to nameservers, and hook it into the appropriate queue.
+ * Normal behaviour is to call adns__query_send, but this can be overridden
+ * for special effects.
+ */
} typeinfo;
adns_status adns__ckl_hostname(adns_state ads, adns_queryflags flags,
typedef struct allocnode {
struct allocnode *next, *back;
+ size_t sz;
} allocnode;
union maxalign {
* Queries in state tcpw/tcpw have been sent (or are in the to-send buffer)
* iff the tcp connection is in state server_ok.
*
+ * Internal queries (from adns__submit_internal) end up on intdone
+ * instead of output, and the callbacks are made on the way out of
+ * adns, to avoid reentrancy hazards.
+ *
* +------------------------+
* START -----> | tosend/NONE |
* +------------------------+
struct query_queue { adns_query head, tail; };
+#define MAXUDP 2
+
struct adns__state {
adns_initflags iflags;
adns_logcallbackfn *logfn;
void *logfndata;
int configerrno;
- struct query_queue udpw, tcpw, childw, output;
+ struct query_queue udpw, tcpw, childw, output, intdone;
adns_query forallnext;
- int nextid, udpsocket, tcpsocket;
+ int nextid, tcpsocket;
+ struct udpsocket { int af; int fd; } udpsocket[MAXUDP];
+ int nudp;
vbuf tcpsend, tcprecv;
int nservers, nsortlist, nsearchlist, searchndots, tcpserver, tcprecv_skip;
enum adns__tcpstate {
* byte-order). Assumes that sa->sa_family is already set correctly.
*/
+char *adns__sockaddr_ntoa(const struct sockaddr *sa, char *buf);
+/* Convert sa to a string, and write it to buf, which must be at least
+ * ADNS_ADDR2TEXT_BUFLEN bytes long (unchecked). Return buf; can't fail.
+ */
+
+extern int adns__make_reverse_domain(const struct sockaddr *sa,
+ const char *zone,
+ char **buf_io, size_t bufsz,
+ char **buf_free_r);
+/* Construct a reverse domain string, given a socket address and a parent
+ * zone. If zone is null, then use the standard reverse-lookup zone for the
+ * address family. If the length of the resulting string is no larger than
+ * bufsz, then the result is stored starting at *buf_io; otherwise a new
+ * buffer is allocated is used, and a pointer to it is stored in both *buf_io
+ * and *buf_free_r (the latter of which should be null on entry). If
+ * something goes wrong, then an errno value is returned: ENOSYS if the
+ * address family of sa isn't recognized, or ENOMEM if the attempt to
+ * allocate an output buffer failed.
+ */
+
+extern int adns__revparse_label(struct revparse_state *rps, int labnum,
+ const char *label, int lablen);
+/* Parse a label in a reverse-domain name, given its index labnum (starting
+ * from zero), a pointer to its contents (which need not be null-terminated),
+ * and its length. The state in *rps is initialized implicitly when labnum
+ * is zero.
+ *
+ * Returns zero if the parse was successful, nonzero if the domain name is
+ * definitely invalid and the parse must be abandoned.
+ */
+
+extern int adns__revparse_done(struct revparse_state *rps, int nlabels,
+ adns_rrtype *rrtype_r, struct af_addr *addr_r);
+/* Finishes parsing a reverse-domain name, given the total number of labels
+ * in the name. On success, fills in the address in *addr_r, and the forward
+ * query type in *rrtype_r (because that turns out to be useful). Returns
+ * nonzero if the parse must be abandoned.
+ */
+
/* From setup.c: */
int adns__setnonblock(adns_state ads, int fd); /* => errno value */
* might be broken, but no reconnect will be attempted.
*/
+struct udpsocket *adns__udpsocket_by_af(adns_state ads, int af);
+/* Find the UDP socket structure in ads which has the given address family.
+ * Return null if there isn't one.
+ *
+ * This is used during initialization, so ads is only partially filled in.
+ * The requirements are that nudp is set, and that udpsocket[i].af are
+ * defined for 0<=i<nudp.
+ */
+
void adns__query_send(adns_query qu, struct timeval now);
/* Query must be in state tosend/NONE; it will be moved to a new state,
* and no further processing can be done on it for now.
/* From query.c: */
adns_status adns__internal_submit(adns_state ads, adns_query *query_r,
+ adns_query parent,
const typeinfo *typei, adns_rrtype type,
vbuf *qumsg_vb, int id,
adns_queryflags flags, struct timeval now,
* answer->cname and answer->owner are _preserved.
*/
-void adns__transfer_interim(adns_query from, adns_query to,
- void *block, size_t sz);
+void adns__transfer_interim(adns_query from, adns_query to, void *block);
/* Transfers an interim allocation from one query to another, so that
* the `to' query will have room for the data when we get to makefinal
* and so that the free will happen when the `to' query is freed
* TTLs get inherited by their parents.
*/
+void adns__free_interim(adns_query qu, void *p);
+/* Forget about a block allocated by adns__alloc_interim.
+ */
+
void *adns__alloc_mine(adns_query qu, size_t sz);
/* Like _interim, but does not record the length for later
* copying into the answer. This just ensures that the memory
* in a datagram and discover that we need to retry the query.
*/
+void adns__cancel(adns_query qu);
void adns__query_done(adns_query qu);
void adns__query_fail(adns_query qu, adns_status stat);
+void adns__cancel_children(adns_query qu);
+
+void adns__returning(adns_state ads, adns_query qu);
+/* Must be called before returning from adns any time that we have
+ * progressed (including made, finished or destroyed) queries.
+ *
+ * Might reenter adns via internal query callbacks, so
+ * external-faciing functions which call adns__returning should
+ * normally be avoided in internal code. */
/* From reply.c: */
void adns__must_gettimeofday(adns_state ads, const struct timeval **now_io,
struct timeval *tv_buf);
+/* Call with care - might reentrantly cause queries to be completed! */
int adns__pollfds(adns_state ads, struct pollfd pollfds_buf[MAX_POLLFDS]);
void adns__fdevents(adns_state ads,
~ianmdlvl / adns.git / blobdiff