#ifndef ADNS_H_INCLUDED
#define ADNS_H_INCLUDED
+#ifdef __cplusplus
+extern "C" { /* I really dislike this - iwj. */
+#endif
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <unistd.h>
/* All struct in_addr anywhere in adns are in NETWORK byte order. */
adns_if_noautosys= 0x0010, /* do not make syscalls at every opportunity */
adns_if_eintr= 0x0020, /* allow _wait and _synchronous to return EINTR */
adns_if_nosigpipe= 0x0040, /* applic has SIGPIPE set to SIG_IGN, do not protect */
+ adns_if_checkc_entex= 0x0100, /* do consistency checks on entry/exit to adns funcs */
+ adns_if_checkc_freq= 0x0300, /* do consistency checks very frequently (slow!) */
} adns_initflags;
typedef enum {
- adns_qf_search= 0x000001, /* use the searchlist */
- adns_qf_usevc= 0x000002, /* use a virtual circuit (TCP connection) */
- adns_qf_owner= 0x000004, /* fill in the owner field in the answer */
- adns_qf_quoteok_query= 0x000010, /* allow quote-requiring chars in query domain */
- adns_qf_quoteok_cname= 0x000020, /* allow ... in CNAME we go via */
- adns_qf_quoteok_anshost= 0x000040, /* allow ... in answers expected to be hostnames */
- adns_qf_cname_loose= 0x000100, /* allow refs to CNAMEs - without, get _s_cname */
- adns_qf_cname_forbid= 0x000200, /* don't follow CNAMEs, instead give _s_cname */
- adns__qf_internalmask= 0x0ff000
+ adns_qf_search= 0x00000001, /* use the searchlist */
+ adns_qf_usevc= 0x00000002, /* use a virtual circuit (TCP connection) */
+ adns_qf_owner= 0x00000004, /* fill in the owner field in the answer */
+ adns_qf_quoteok_query= 0x00000010, /* allow quote-requiring chars in query domain */
+ adns_qf_quoteok_cname= 0x00000000, /* allow ... in CNAME we go via - now default */
+ adns_qf_quoteok_anshost= 0x00000040, /* allow ... in things supposed to be hostnames */
+ adns_qf_quotefail_cname= 0x00000080, /* refuse if quote-req chars in CNAME we go via */
+ adns_qf_cname_loose= 0x00000100, /* allow refs to CNAMEs - without, get _s_cname */
+ adns_qf_cname_forbid= 0x00000200, /* don't follow CNAMEs, instead give _s_cname */
+ adns__qf_internalmask= 0x0ff00000
} adns_queryflags;
typedef enum {
} adns_rrtype;
-/* In queries without qf_quoteok_*, all domains must have standard
- * legal syntax. In queries _with_ qf_quoteok_*, domains in the query
- * or response may contain any characters, quoted according to RFC1035
- * 5.1. On input to adns, the char* is a pointer to the interior of a
- * " delimited string, except that " may appear in it, and on output,
+/*
+ * In queries without qf_quoteok_*, all domains must have standard
+ * legal syntax, or you get adns_s_querydomainvalid (if the query
+ * domain contains bad characters) or adns_s_answerdomaininvalid (if
+ * the answer contains bad characters).
+ *
+ * In queries _with_ qf_quoteok_*, domains in the query or response
+ * may contain any characters, quoted according to RFC1035 5.1. On
+ * input to adns, the char* is a pointer to the interior of a "
+ * delimited string, except that " may appear in it, and on output,
* the char* is a pointer to a string which would be legal either
* inside or outside " delimiters, and any characters not usually
* legal in domain names will be quoted as \X (if the character is
* 33-126 except \ and ") or \DDD.
*
- * Do not ask for _raw records containing mailboxes without
- * specifying _qf_anyquote.
+ * If the query goes via a CNAME then the canonical name (ie, the
+ * thing that the CNAME record refers to) is usually allowed to
+ * contain any characters, which will be quoted as above. With
+ * adns_qf_quotefail_cname you get adns_s_answerdomaininvalid when
+ * this happens. (This is a change from version 0.4 and earlier, in
+ * which failing the query was the default, and you had to say
+ * adns_qf_quoteok_cname to avoid this; that flag is now deprecated.)
+ *
+ * In version 0.4 and earlier, asking for _raw records containing
+ * mailboxes without specifying _qf_quoteok_anshost was silly. This
+ * is no longer the case. In this version only parts of responses
+ * that are actually supposed to be hostnames will be refused by
+ * default if quote-requiring characters are found.
+ */
+
+/*
+ * If you ask for an RR which contains domains which are actually
+ * encoded mailboxes, and don't ask for the _raw version, then adns
+ * returns the mailbox formatted suitably for an RFC822 recipient
+ * header field. The particular format used is that if the mailbox
+ * requires quoting according to the rules in RFC822 then the
+ * local-part is quoted in double quotes, which end at the next
+ * unescaped double quote. (\ is the escape char, and is doubled, and
+ * is used to escape only \ and ".) Otherwise the local-part is
+ * presented as-is. In any case this is followed by an @ and the
+ * domain. The domain will not contain any characters not legal in
+ * hostnames. adns will protect the application from local parts
+ * containing control characters - these appear to be legal according
+ * to RFC822 but are clearly a bad idea.
+ *
+ * If you ask for the domain with _raw then _no_ checking is done
+ * (even on the host part, regardless of adns_qf_quoteok_anshost), and
+ * you just get the domain name in master file format.
+ *
+ * If no mailbox is supplied the returned string will be `.' in either
+ * caswe.
*/
typedef enum {
char *owner; /* only set if requested in query flags */
adns_rrtype type; /* guaranteed to be same as in query */
time_t expires; /* expiry time, defined only if _s_ok, nxdomain or nodata. NOT TTL! */
- int nrrs, rrsz;
+ int nrrs, rrsz; /* nrrs is 0 if an error occurs */
union {
void *untyped;
unsigned char *bytes;
* first adns_submit or _transact call using the same adns_state after
* it became invalid, so you may compare it for equality with other
* query handles until you next call _query or _transact.
+ *
+ * _submit and _synchronous return ENOSYS if they don't understand the
+ * query type.
*/
+int adns_submit_reverse(adns_state ads,
+ const struct sockaddr *addr,
+ adns_rrtype type,
+ adns_queryflags flags,
+ void *context,
+ adns_query *query_r);
+/* type must be _r_ptr or _r_ptr_raw. _qf_search is ignored. */
+
void adns_finish(adns_state ads);
/* You may call this even if you have queries outstanding;
* they will be cancelled.
*/
-struct adns_query adns_forallqueries_begin(adns_state ads, void **context_r);
-struct adns_query adns_forallqueries_next(adns_state ads, adns_query, void **context_r);
+void adns_forallqueries_begin(adns_state ads);
+adns_query adns_forallqueries_next(adns_state ads, void **context_r);
/* Iterator functions, which you can use to loop over the outstanding
- * (submitted but not yet successfuly checked/waited) queries. Each
- * function returns a query handle and a corresponding context pointer,
- * or returns 0 setting *context_r to 0 if there are no (more) queries.
- * There is no need to explicitly finish an iteration. context_r may be 0.
- *
- * IMPORTANT: you MUST NOT call ANY other adns function with the same
- * adns_state, or with a query in the same adns_state, while you are
- * doing one of these iterations. After such a call the iterator
- * value has undefined meaning and must not be used.
+ * (submitted but not yet successfuly checked/waited) queries.
+ *
+ * You can only have one iteration going at once. You may call _begin
+ * at any time; after that, an iteration will be in progress. You may
+ * only call _next when an iteration is in progress - anything else
+ * may coredump. The iteration remains in progress until _next
+ * returns 0, indicating that all the queries have been walked over,
+ * or ANY other adns function is called with the same adns_state (or a
+ * query in the same adns_state). There is no need to explicitly
+ * finish an iteration.
+ *
+ * context_r may be 0. *context_r may not be set when _next returns 0.
+ */
+
+void adns_checkconsistency(adns_state ads, adns_query qu);
+/* Checks the consistency of adns's internal data structures.
+ * If any error is found, the program will abort().
+ * You may pass 0 for qu; if you pass non-null then additional checks
+ * are done to make sure that qu is a valid query.
*/
/*
* in *nfds_io, and always return either 0 (if it is not interested in
* any fds) or ERANGE (if it is).
*
- * NOTE that (unless timeout_io is 0) adns may acquire additional fds
+ * NOTE that (unless now is 0) adns may acquire additional fds
* from one call to the next, so you must put adns_beforepoll in a
* loop, rather than assuming that the second call (with the buffer
* size requested by the first) will not return ERANGE.
* adns_beforepoll will return 0 on success, and will not fail for any
* reason other than the fds buffer being too small (ERANGE).
*
- * This call will never actually do any I/O, or change the fds that
- * adns is using or the timeouts it wants; and in any case it won't
- * block.
+ * This call will never actually do any I/O. If you supply the
+ * current time it will not change the fds that adns is using or the
+ * timeouts it wants.
+ *
+ * In any case this call won't block.
*/
#define ADNS_POLLFDS_RECOMMENDED 2
const char **rrtname_r, const char **fmtname_r,
int *len_r,
const void *datap, char **data_r);
-/* Gets information in human-readable (but non-i18n) form
- * for eg debugging purposes. type must be specified,
- * and the official name of the corresponding RR type will
- * be returned in *rrtname_r, and information about the processing
- * style in *fmtname_r. The length of the table entry in an answer
- * for that type will be returned in in *len_r.
- * Any or all of rrtname_r, fmtname_r and len_r may be 0.
- * If fmtname_r is non-null then *fmtname_r may be
- * null on return, indicating that no special processing is
- * involved.
- *
- * data_r be must be non-null iff datap is. In this case
- * *data_r will be set to point to a human-readable text
- * string representing the RR data. The text will have
- * been obtained from malloc() and must be freed by the caller.
+/*
+
+ * Get information about a query type, or convert reply data to a
+ * textual form. type must be specified, and the official name of the
+ * corresponding RR type will be returned in *rrtname_r, and
+ * information about the processing style in *fmtname_r. The length
+ * of the table entry in an answer for that type will be returned in
+ * in *len_r. Any or all of rrtname_r, fmtname_r and len_r may be 0.
+ * If fmtname_r is non-null then *fmtname_r may be null on return,
+ * indicating that no special processing is involved.
+ *
+ * data_r be must be non-null iff datap is. In this case *data_r will
+ * be set to point to a string pointing to a representation of the RR
+ * data in master file format. (The owner name, timeout, class and
+ * type will not be present - only the data part of the RR.) The
+ * memory will have been obtained from malloc() and must be freed by
+ * the caller.
*
* Usually this routine will succeed. Possible errors include:
* adns_s_nomemory
* adns_s_invaliddata (*datap contained garbage)
* If an error occurs then no memory has been allocated,
* and *rrtname_r, *fmtname_r, *len_r and *data_r are undefined.
+ *
+ * There are some adns-invented data formats which are not official
+ * master file formats. These include:
+ *
+ * Mailboxes if __qtf_mail822: these are just included as-is.
+ *
+ * Addresses (adns_rr_addr): these may be of pretty much any type.
+ * The representation is in two parts: first, a word for the address
+ * family (ie, in AF_XXX, the XXX), and then one or more items for the
+ * address itself, depending on the format. For an IPv4 address the
+ * syntax is INET followed by the dotted quad (from inet_ntoa).
+ * Currently only IPv4 is supported.
+ *
+ * Text strings (as in adns_rr_txt) appear inside double quotes, and
+ * use \" and \\ to represent " and \, and \xHH to represent
+ * characters not in the range 32-126.
+ *
+ * Hostname with addresses (adns_rr_hostaddr): this consists of the
+ * hostname, as usual, followed by the adns_status value, as an
+ * abbreviation, and then a descriptive string (encoded as if it were
+ * a piece of text), for the address lookup, followed by zero or more
+ * addresses enclosed in ( and ). If the result was a permanent
+ * failure, then a single ? appears instead of the ( ). If the
+ * result was a temporary failure then an empty pair of parentheses
+ * appears (which a space in between). For example, one of the NS
+ * records for greenend.org.uk comes out like
+ * ns.chiark.greenend.org.uk ok "OK" ( INET 195.224.76.132 )
+ * an MX referring to a nonexistent host might come out like:
+ * 50 sun2.nsfnet-relay.ac.uk nxdomain "No such domain" ( )
+ * and if nameserver information is not available you might get:
+ * dns2.spong.dyn.ml.org timeout "DNS query timed out" ?
*/
const char *adns_strerror(adns_status st);
* not returned by the same adns library.
*/
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif
#endif
~mdw / adns / blobdiff