/*
- * Copyright (C)1998 Ian Jackson.
- * This version provided for review and comment only.
- *
- * $Id$
+ * adns.h
+ * - adns user-visible API (single-threaded, without any locking)
*/
/*
- * This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
+ *
+ * This file is
+ * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ * It is part of adns, which is
+ * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ * Copyright (C) 1999 Tony Finch <dot@dotat.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
+ *
+ *
+ * For the benefit of certain LGPL'd `omnibus' software which provides
+ * a uniform interface to various things including adns, I make the
+ * following additional licence. I do this because the GPL would
+ * otherwise force either the omnibus software to be GPL'd or for the
+ * adns-using part to be distributed separately.
+ *
+ * So, you may also redistribute and/or modify adns.h (but only the
+ * public header file adns.h and not any other part of adns) under the
+ * terms of the GNU Library General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * Note that adns itself is GPL'd. Authors of adns-using applications
+ * with GPL-incompatible licences, and people who distribute adns with
+ * applications where the whole distribution is not GPL'd, are still
+ * likely to be in violation of the GPL. Anyone who wants to do this
+ * should contact Ian Jackson. Please note that to avoid encouraging
+ * people to infringe the GPL as it applies the body of adns, I think
+ * that if you take advantage of the special exception to redistribute
+ * just adns.h under the LGPL, you should retain this paragraph in its
+ * place in the appropriate copyright statements.
+ *
+ *
+ * You should have received a copy of the GNU General Public License,
+ * or the GNU Library General Public License, as appropriate, along
+ * with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *
+ * $Id$
*/
#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. */
typedef struct adns__state *adns_state;
typedef struct adns__query *adns_query;
adns_if_noerrprint= 0x0002, /* never print output to stderr (_debug overrides) */
adns_if_noserverwarn= 0x0004, /* do not warn to stderr about duff nameservers etc */
adns_if_debug= 0x0008, /* enable all output to stderr plus debug msgs */
+ adns_if_logpid= 0x0080, /* include pid in diagnostic output */
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= 0x0001, /* use the searchlist */
- adns_qf_usevc= 0x0002, /* use a virtual circuit (TCP connection) */
- adns_qf_anyquote= 0x0004,
- adns_qf_loosecname= 0x0008, /* allow refs to CNAMEs - without, get _s_cname */
- adns_qf_nocname= 0x0010, /* don't follow CNAMEs, instead give _s_cname */
+ 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_r_rp_raw= 17,
adns_r_rp= adns_r_rp_raw|adns__qtf_mail822,
+
+ adns_r_addr= adns_r_a|adns__qtf_deref
} adns_rrtype;
-/* In queries without qtf_anyquote, all domains must have standard
- * legal syntax. In queries _with_ qtf_anyquote, 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.
+/*
+ * 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.
+ *
+ * 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 {
adns_s_ok,
+
+ /* locally induced errors */
+ adns_s_nomemory,
+ adns_s_unknownrrtype,
+ adns_s_systemfail,
+
+ adns_s_max_localfail= 29,
+
+ /* remotely induced errors, detected locally */
adns_s_timeout,
- adns_s_nolocalmem,
adns_s_allservfail,
- adns_s_servfail,
- adns_s_notimplemented,
- adns_s_refused,
- adns_s_reasonunknown,
adns_s_norecurse,
- adns_s_serverfaulty,
- adns_s_unknownreply,
- adns_s_invaliddata,
+ adns_s_invalidresponse,
+ adns_s_unknownformat,
+
+ adns_s_max_remotefail= 59,
+
+ /* remotely induced errors, reported by remote server to us */
+ adns_s_rcodeservfail,
+ adns_s_rcodeformaterror,
+ adns_s_rcodenotimplemented,
+ adns_s_rcoderefused,
+ adns_s_rcodeunknown,
+
adns_s_max_tempfail= 99,
- adns_s_inconsistent, /* PTR gives domain whose A does not match */
- adns_s_cname, /* CNAME found where data eg A expected (not if _qf_loosecname) */
- adns_s_invalidanswerdomain,
- /* fixme: implement _s_cname */
- adns_s_max_remotemisconfig= 199,
+
+ /* remote configuration errors */
+ adns_s_inconsistent, /* PTR gives domain whose A does not exist and match */
+ adns_s_prohibitedcname, /* CNAME found where eg A expected (not if _qf_loosecname) */
+ adns_s_answerdomaininvalid,
+ adns_s_answerdomaintoolong,
+ adns_s_invaliddata,
+
+ adns_s_max_misconfig= 199,
+
+ /* permanent problems with the query */
+ adns_s_querydomainwrong,
+ adns_s_querydomaininvalid,
+ adns_s_querydomaintoolong,
+
+ adns_s_max_misquery= 299,
+
+ /* permanent errors */
adns_s_nxdomain,
adns_s_nodata,
- adns_s_invalidquerydomain,
- adns_s_domaintoolong,
+
+ adns_s_max_permfail= 499
+
} adns_status;
typedef struct {
- char *dm;
+ int len;
+ union {
+ struct sockaddr sa;
+ struct sockaddr_in inet;
+ } addr;
+} adns_rr_addr;
+
+typedef struct {
+ char *host;
adns_status astatus;
int naddrs; /* temp fail => -1, perm fail => 0, s_ok => >0 */
- struct in_addr *addrs;
-} adns_rr_dmaddr;
+ adns_rr_addr *addrs;
+} adns_rr_hostaddr;
typedef struct {
- char *a, *b;
+ char *(array[2]);
} adns_rr_strpair;
typedef struct {
int i;
- adns_rr_dmaddr dmaddr;
-} adns_rr_intdmaddr;
+ adns_rr_hostaddr ha;
+} adns_rr_inthostaddr;
typedef struct {
+ /* Used both for mx_raw, in which case i is the preference and str the domain,
+ * and for txt, in which case each entry has i for the `text' length,
+ * and str for the data (which will have had an extra nul appended
+ * so that if it was plain text it is now a null-terminated string).
+ */
int i;
char *str;
} adns_rr_intstr;
typedef struct {
- char *ns0, *rp;
+ adns_rr_intstr array[2];
+} adns_rr_intstrpair;
+
+typedef struct {
+ char *mname, *rname;
unsigned long serial, refresh, retry, expire, minimum;
} adns_rr_soa;
typedef struct {
adns_status status;
char *cname; /* always NULL if query was for CNAME records */
+ char *owner; /* only set if requested in query flags, and may be 0 on error anyway */
adns_rrtype type; /* guaranteed to be same as in query */
- int nrrs, rrsz;
+ time_t expires; /* expiry time, defined only if _s_ok, nxdomain or nodata. NOT TTL! */
+ int nrrs, rrsz; /* nrrs is 0 if an error occurs */
union {
void *untyped;
unsigned char *bytes;
- char *(*str); /* ns_raw, cname, ptr, ptr_raw */
- char *(**manystr); /* txt (list is null-terminated) */
- struct in_addr *inaddr; /* a */
- adns_rr_dmaddr *dmaddr; /* ns */
- adns_rr_strpair *strpair; /* hinfo, rp, rp_raw */
- adns_rr_intdmaddr *intdmaddr; /* mx */
- adns_rr_intstr *intstr; /* mx_raw */
- adns_rr_soa *soa; /* soa, soa_raw */
+ char *(*str); /* ns_raw, cname, ptr, ptr_raw */
+ adns_rr_intstr *(*manyistr); /* txt (list of strings ends with i=-1, str=0) */
+ adns_rr_addr *addr; /* addr */
+ struct in_addr *inaddr; /* a */
+ adns_rr_hostaddr *hostaddr; /* ns */
+ adns_rr_intstrpair *intstrpair; /* hinfo */
+ adns_rr_strpair *strpair; /* rp, rp_raw */
+ adns_rr_inthostaddr *inthostaddr; /* mx */
+ adns_rr_intstr *intstr; /* mx_raw */
+ adns_rr_soa *soa; /* soa, soa_raw */
} rrs;
} adns_answer;
* If the call is successful, *query_io, *answer_r, and *context_r
* will all be set.
* Errors:
- * Return values are 0 or an errno value;
- * Seriously fatal system errors (eg, failure to create sockets,
- * malloc failure, etc.) return errno values;
- * Other errors (nameserver failure, timed out connections, &c)
- * are returned in the status field of the answer. If status is
- * nonzero then nrrs will be 0, otherwise it will be >0.
- * type will always be the type requested;
- * If no (appropriate) requests are done adns_check returns EWOULDBLOCK;
- * If no (appropriate) requests are outstanding adns_query and adns_wait return ESRCH;
+ * Return values are 0 or an errno value.
+ *
+ * For _init, _init_strcfg, _submit and _synchronous, system errors
+ * (eg, failure to create sockets, malloc failure, etc.) return errno
+ * values.
+ *
+ * For _wait and _check failures are reported in the answer
+ * structure, and only 0, ESRCH or (for _check) EAGAIN is
+ * returned: if no (appropriate) requests are done adns_check returns
+ * EAGAIN; if no (appropriate) requests are outstanding both
+ * adns_query and adns_wait return ESRCH.
+ *
+ * Additionally, _wait can return EINTR if you set adns_if_eintr.
+ *
+ * All other errors (nameserver failure, timed out connections, &c)
+ * are returned in the status field of the answer. After a
+ * successful _wait or _check, if status is nonzero then nrrs will be
+ * 0, otherwise it will be >0. type will always be the type
+ * requested.
*/
-int adns_init(adns_state *newstate_r, adns_initflags flags, FILE *diagfile/*0=>stderr*/);
+int adns_init(adns_state *newstate_r, adns_initflags flags,
+ FILE *diagfile /*0=>stderr*/);
+
+int adns_init_strcfg(adns_state *newstate_r, adns_initflags flags,
+ FILE *diagfile /*0=>discard*/, const char *configtext);
+
+/* Configuration:
+ * adns_init reads /etc/resolv.conf, which is expected to be (broadly
+ * speaking) in the format expected by libresolv, and then
+ * /etc/resolv-adns.conf if it exists. adns_init_strcfg is instead
+ * passed a string which is interpreted as if it were the contents of
+ * resolv.conf or resolv-adns.conf. In general, configuration which
+ * is set later overrides any that is set earlier.
+ *
+ * Standard directives understood in resolv[-adns].conf:
+ *
+ * nameserver <address>
+ * Must be followed by the IP address of a nameserver. Several
+ * nameservers may be specified, and they will be tried in the order
+ * found. There is a compiled in limit, currently 5, on the number
+ * of nameservers. (libresolv supports only 3 nameservers.)
+ *
+ * search <domain> ...
+ * Specifies the search list for queries which specify
+ * adns_qf_search. This is a list of domains to append to the query
+ * domain. The query domain will be tried as-is either before all
+ * of these or after them, depending on the ndots option setting
+ * (see below).
+ *
+ * domain <domain>
+ * This is present only for backward compatibility with obsolete
+ * versions of libresolv. It should not be used, and is interpreted
+ * by adns as if it were `search' - note that this is subtly
+ * different to libresolv's interpretation of this directive.
+ *
+ * sortlist <addr>/<mask> ...
+ * Should be followed by a sequence of IP-address and netmask pairs,
+ * separated by spaces. They may be specified as
+ * eg. 172.30.206.0/24 or 172.30.206.0/255.255.255.0. Currently up
+ * to 15 pairs may be specified (but note that libresolv only
+ * supports up to 10).
+ *
+ * options
+ * Should followed by one or more options, separated by spaces.
+ * Each option consists of an option name, followed by optionally
+ * a colon and a value. Options are listed below.
+ *
+ * Non-standard directives understood in resolv[-adns].conf:
+ *
+ * clearnameservers
+ * Clears the list of nameservers, so that further nameserver lines
+ * start again from the beginning.
+ *
+ * include <filename>
+ * The specified file will be read.
+ *
+ * Additionally, adns will ignore lines in resolv[-adns].conf which
+ * start with a #.
+ *
+ * Standard options understood:
+ *
+ * debug
+ * Enables debugging output from the resolver, which will be written
+ * to stderr.
+ *
+ * ndots:<count>
+ * Affects whether queries with adns_qf_search will be tried first
+ * without adding domains from the searchlist, or whether the bare
+ * query domain will be tried last. Queries which contain at least
+ * <count> dots will be tried bare first. The default is 1.
+ *
+ * Non-standard options understood:
+ *
+ * adns_checkc:none
+ * adns_checkc:entex
+ * adns_checkc:freq
+ * Changes the consistency checking frequency; this overrides the
+ * setting of adns_if_check_entex, adns_if_check_freq, or neither,
+ * in the flags passed to adns_init.
+ *
+ * There are a number of environment variables which can modify the
+ * behaviour of adns. They take effect only if adns_init is used, and
+ * the caller of adns_init can disable them using adns_if_noenv. In
+ * each case there is both a FOO and an ADNS_FOO; the latter is
+ * interpreted later so that it can override the former. Unless
+ * otherwise stated, environment variables are interpreted after
+ * resolv[-adns].conf are read, in the order they are listed here.
+ *
+ * RES_CONF, ADNS_RES_CONF
+ * A filename, whose contets are in the format of resolv.conf.
+ *
+ * RES_CONF_TEXT, ADNS_RES_CONF_TEXT
+ * A string in the format of resolv.conf.
+ *
+ * RES_OPTIONS, ADNS_RES_OPTIONS
+ * These are parsed as if they appeared in the `options' line of a
+ * resolv.conf. In addition to being parsed at this point in the
+ * sequence, they are also parsed at the very beginning before
+ * resolv.conf or any other environment variables are read, so that
+ * any debug option can affect the processing of the configuration.
+ *
+ * LOCALDOMAIN, ADNS_LOCALDOMAIN
+ * These are interpreted as if their contents appeared in a `search'
+ * line in resolv.conf.
+ */
int adns_synchronous(adns_state ads,
const char *owner,
adns_rrtype type,
adns_queryflags flags,
adns_answer **answer_r);
-/* Will not return EINTR. */
/* NB: if you set adns_if_noautosys then _submit and _check do not
- * make any system calls; you must use adns_callback (possibly after
- * adns_interest) to actually get things to happen.
+ * make any system calls; you must use some of the asynch-io event
+ * processing functions to actually get things to happen.
*/
int adns_submit(adns_state ads,
void *context,
adns_query *query_r);
+/* The owner should be quoted in master file format. */
+
int adns_check(adns_state ads,
adns_query *query_io,
adns_answer **answer_r,
adns_query *query_io,
adns_answer **answer_r,
void **context_r);
-/* Might return EINTR - if so, try again */
+
+/* same as adns_wait but uses poll(2) internally */
+int adns_wait_poll(adns_state ads,
+ adns_query *query_io,
+ adns_answer **answer_r,
+ void **context_r);
void adns_cancel(adns_query query);
-int adns_finish(adns_state);
+/* The adns_query you get back from _submit is valid (ie, can be
+ * legitimately passed into adns functions) until it is returned by
+ * adns_check or adns_wait, or passed to adns_cancel. After that it
+ * must not be used. You can rely on it not being reused until the
+ * 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.
+ * addr->sa_family must be AF_INET or you get ENOSYS.
+ */
+
+void adns_finish(adns_state ads);
/* You may call this even if you have queries outstanding;
* they will be cancelled.
*/
-int adns_callback(adns_state, int maxfd, const fd_set *readfds, const fd_set *writefds,
- const fd_set *exceptfds);
-/* Gives adns flow-of-control for a bit. This will never block.
- * If maxfd == -1 then adns will check (make nonblocking system calls on)
- * all of its own filedescriptors; otherwise it will only use those
- * < maxfd and specified in the fd_set's, as if select had returned them.
- * Other fd's may be in the fd_sets, and will be ignored.
- * _callback returns how many adns fd's were in the various sets, so
- * you can tell if your select handling code has missed something and is going awol.
- *
- * May also return -1 if a critical syscall failed, setting errno.
+
+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.
+ *
+ * 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_interest(adns_state, int *maxfd_io, fd_set *readfds_io,
- fd_set *writefds_io, fd_set *exceptfds_io,
- struct timeval **tv_mod, struct timeval *tv_buf);
-/* Find out file descriptors adns is interested in, and when it
- * would like the opportunity to time something out. If you do not plan to
- * block then tv_mod may be 0. Otherwise, tv_mod may point to 0 meaning
- * you have no timeout of your own, in which case tv_buf must be non-null and
- * _interest may fill it in and set *tv_mod=tv_buf.
- * readfds, writefds, exceptfds and maxfd may not be 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.
*/
-/* Example expected/legal calling sequences:
+/*
+ * Example expected/legal calling sequence for submit/check/wait:
* adns_init
* adns_submit 1
* adns_submit 2
* adns_submit 3
* adns_wait 1
- * adns_check 3 -> EWOULDBLOCK
+ * adns_check 3 -> EAGAIN
* adns_wait 2
* adns_wait 3
* ....
* adns_finish
+ */
+
+/*
+ * Entrypoints for generic asynch io:
+ * (these entrypoints are not very useful except in combination with *
+ * some of the other I/O model calls which can tell you which fds to
+ * be interested in):
+ *
+ * Note that any adns call may cause adns to open and close fds, so
+ * you must call beforeselect or beforepoll again just before
+ * blocking, or you may not have an up-to-date list of it's fds.
+ */
+
+int adns_processany(adns_state ads);
+/* Gives adns flow-of-control for a bit. This will never block, and
+ * can be used with any threading/asynch-io model. If some error
+ * occurred which might cause an event loop to spin then the errno
+ * value is returned.
+ */
+
+int adns_processreadable(adns_state ads, int fd, const struct timeval *now);
+int adns_processwriteable(adns_state ads, int fd, const struct timeval *now);
+int adns_processexceptional(adns_state ads, int fd, const struct timeval *now);
+/* Gives adns flow-of-control so that it can process incoming data
+ * from, or send outgoing data via, fd. Very like _processany. If it
+ * returns zero then fd will no longer be readable or writeable
+ * (unless of course more data has arrived since). adns will _only_
+ * use that fd and only in the manner specified, regardless of whether
+ * adns_if_noautosys was specified.
+ *
+ * adns_processexceptional should be called when select(2) reports an
+ * exceptional condition, or poll(2) reports POLLPRI.
+ *
+ * It is fine to call _processreabable or _processwriteable when the
+ * fd is not ready, or with an fd that doesn't belong to adns; it will
+ * then just return 0.
+ *
+ * If some error occurred which might prevent an event loop to spin
+ * then the errno value is returned.
+ */
+
+void adns_processtimeouts(adns_state ads, const struct timeval *now);
+/* Gives adns flow-of-control so that it can process any timeouts
+ * which might have happened. Very like _processreadable/writeable.
+ *
+ * now may be 0; if it isn't, *now must be the current time, recently
+ * obtained from gettimeofday.
+ */
+
+void adns_firsttimeout(adns_state ads,
+ struct timeval **tv_mod, struct timeval *tv_buf,
+ struct timeval now);
+/* Asks adns when it would first like the opportunity to time
+ * something out. now must be the current time, from gettimeofday.
+ *
+ * If tv_mod points to 0 then tv_buf must be non-null, and
+ * _firsttimeout will fill in *tv_buf with the time until the first
+ * timeout, and make *tv_mod point to tv_buf. If adns doesn't have
+ * anything that might need timing out it will leave *tv_mod as 0.
+ *
+ * If *tv_mod is not 0 then tv_buf is not used. adns will update
+ * *tv_mod if it has any earlier timeout, and leave it alone if it
+ * doesn't.
+ *
+ * This call will not actually do any I/O, or change the fds that adns
+ * is using. It always succeeds and never blocks.
+ */
+
+void adns_globalsystemfailure(adns_state ads);
+/* If serious problem(s) happen which globally affect your ability to
+ * interact properly with adns, or adns's ability to function
+ * properly, you or adns can call this function.
+ *
+ * All currently outstanding queries will be made to fail with
+ * adns_s_systemfail, and adns will close any stream sockets it has
+ * open.
+ *
+ * This is used by adns, for example, if gettimeofday() fails.
+ * Without this the program's event loop might start to spin !
+ *
+ * This call will never block.
+ */
+
+/*
+ * Entrypoints for select-loop based asynch io:
+ */
+
+void adns_beforeselect(adns_state ads, int *maxfd, fd_set *readfds,
+ fd_set *writefds, fd_set *exceptfds,
+ struct timeval **tv_mod, struct timeval *tv_buf,
+ const struct timeval *now);
+/* Find out file descriptors adns is interested in, and when it would
+ * like the opportunity to time something out. If you do not plan to
+ * block then tv_mod may be 0. Otherwise, tv_mod and tv_buf are as
+ * for adns_firsttimeout. readfds, writefds, exceptfds and maxfd_io may
+ * not be 0.
+ *
+ * If *now is not 0 then this will never actually do any I/O, or
+ * change the fds that adns is using or the timeouts it wants. In any
+ * case it won't block.
+ */
+
+void adns_afterselect(adns_state ads, int maxfd, const fd_set *readfds,
+ const fd_set *writefds, const fd_set *exceptfds,
+ const struct timeval *now);
+/* Gives adns flow-of-control for a bit; intended for use after
+ * select. This is just a fancy way of calling adns_processreadable/
+ * writeable/timeouts as appropriate, as if select had returned the
+ * data being passed. Always succeeds.
+ */
+
+/*
+ * Example calling sequence:
*
* adns_init _noautosys
* loop {
- * adns_interest
+ * adns_beforeselect
* select
- * adns_callback
+ * adns_afterselect
* ...
* adns_submit / adns_check
* ...
* }
*/
+/*
+ * Entrypoints for poll-loop based asynch io:
+ */
+
+struct pollfd;
+/* In case your system doesn't have it or you forgot to include
+ * <sys/poll.h>, to stop the following declarations from causing
+ * problems. If your system doesn't have poll then the following
+ * entrypoints will not be defined in libadns. Sorry !
+ */
+
+int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, int *timeout_io,
+ const struct timeval *now);
+/* Finds out which fd's adns is interested in, and when it would like
+ * to be able to time things out. This is in a form suitable for use
+ * with poll(2).
+ *
+ * On entry, usually fds should point to at least *nfds_io structs.
+ * adns will fill up to that many structs will information for poll,
+ * and record in *nfds_io how many structs it filled. If it wants to
+ * listen for more structs then *nfds_io will be set to the number
+ * required and _beforepoll will return ERANGE.
+ *
+ * You may call _beforepoll with fds==0 and *nfds_io 0, in which case
+ * adns will fill in the number of fds that it might be interested in
+ * in *nfds_io, and always return either 0 (if it is not interested in
+ * any fds) or ERANGE (if it is).
+ *
+ * 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 only ever sets POLLIN, POLLOUT and POLLPRI in its pollfd
+ * structs, and only ever looks at those bits. POLLPRI is required to
+ * detect TCP Urgent Data (which should not be used by a DNS server)
+ * so that adns can know that the TCP stream is now useless.
+ *
+ * In any case, *timeout_io should be a timeout value as for poll(2),
+ * which adns will modify downwards as required. If the caller does
+ * not plan to block then *timeout_io should be 0 on entry, or
+ * alternatively, timeout_io may be 0. (Alternatively, the caller may
+ * use _beforeselect with timeout_io==0 to find out about file
+ * descriptors, and use _firsttimeout is used to find out when adns
+ * might want to time something out.)
+ *
+ * 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. 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
+/* If you allocate an fds buf with at least RECOMMENDED entries then
+ * you are unlikely to need to enlarge it. You are recommended to do
+ * so if it's convenient. However, you must be prepared for adns to
+ * require more space than this.
+ */
+
+void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds,
+ const struct timeval *now);
+/* Gives adns flow-of-control for a bit; intended for use after
+ * poll(2). fds and nfds should be the results from poll(). pollfd
+ * structs mentioning fds not belonging to adns will be ignored.
+ */
+
+
adns_status adns_rr_info(adns_rrtype type,
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_notimplemented (RR type not known)
+ * adns_s_rrtypeunknown
* 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);
+const char *adns_errabbrev(adns_status st);
+const char *adns_errtypeabbrev(adns_status st);
+/* Like strerror but for adns_status values. adns_errabbrev returns
+ * the abbreviation of the error - eg, for adns_s_timeout it returns
+ * "timeout". adns_errtypeabbrev returns the abbreviation of the
+ * error class: ie, for values up to adns_s_max_XXX it will return the
+ * string XXX. You MUST NOT call these functions with status values
+ * not returned by the same adns library.
+ */
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif
#endif
~ianmdlvl / adns.git / blobdiff