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+ /*
+ * internal.h
+ * - declarations of private objects with external linkage (adns__*)
+ * - definitons of internal macros
+ * - comments regarding library data structures
+ */
+ /*
+ * This file is
+ * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ * It is part of adns, which is
+ * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
+ * Copyright (C) 1999-2000 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
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * 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.
+ *
+ * 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.
+ */
+
+ #ifndef ADNS_INTERNAL_H_INCLUDED
+ #define ADNS_INTERNAL_H_INCLUDED
+
+ /* get rid of assertions -- rse */
+ #define NDEBUG 1
+
+ #include "adns_config.h"
+ typedef unsigned char byte;
+
+ #include <stdarg.h>
+ #include <assert.h>
+ #include <unistd.h>
+ #include <signal.h>
+ #include <errno.h>
+ #include <string.h>
+
+ #include <sys/time.h>
+
+ #include "adns.h"
+ #include "adns_dlist.h"
+
+ /* Configuration and constants */
+
+ #define MAXSERVERS 5
+ #define MAXSORTLIST 15
+ #define UDPMAXRETRIES 15
+ #define UDPRETRYMS 2000
+ #define TCPWAITMS 30000
+ #define TCPCONNMS 14000
+ #define TCPIDLEMS 30000
+ #define MAXTTLBELIEVE (7*86400) /* any TTL > 7 days is capped */
+
+ #define DNS_PORT 53
+ #define DNS_MAXUDP 512
+ #define DNS_MAXLABEL 63
+ #define DNS_MAXDOMAIN 255
+ #define DNS_HDRSIZE 12
+ #define DNS_IDOFFSET 0
+ #define DNS_CLASS_IN 1
+
+ #define DNS_INADDR_ARPA "in-addr", "arpa"
+
+ #define MAX_POLLFDS ADNS_POLLFDS_RECOMMENDED
+
+ typedef enum {
+ cc_user,
+ cc_entex,
+ cc_freq
+ } consistency_checks;
+
+ typedef enum {
+ rcode_noerror,
+ rcode_formaterror,
+ rcode_servfail,
+ rcode_nxdomain,
+ rcode_notimp,
+ rcode_refused
+ } dns_rcode;
+
+ /* Shared data structures */
+
+ typedef union {
+ adns_status status;
+ char *cp;
+ adns_rrtype type;
+ int i;
+ struct in_addr ia;
+ unsigned long ul;
+ } rr_align;
+
+ typedef struct {
+ int used, avail;
+ byte *buf;
+ } vbuf;
+
+ typedef struct {
+ adns_state ads;
+ adns_query qu;
+ int serv;
+ const byte *dgram;
+ int dglen, nsstart, nscount, arcount;
+ struct timeval now;
+ } parseinfo;
+
+ typedef struct {
+ adns_rrtype type;
+ const char *rrtname;
+ const char *fmtname;
+ int rrsz;
+
+ void (*makefinal)(adns_query qu, void *data);
+ /* Change memory management of *data.
+ * Previously, used alloc_interim, now use alloc_final.
+ */
+
+ adns_status (*convstring)(vbuf *vb, const void *data);
+ /* Converts the RR data to a string representation in vbuf.
+ * vbuf will be appended to (it must have been initialised),
+ * and will not be null-terminated by convstring.
+ */
+
+ adns_status (*parse)(const parseinfo *pai, 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.
+ *
+ * nsstart is the offset of the authority section.
+ */
+
+ int (*diff_needswap)(adns_state ads, const void *datap_a, const void *datap_b);
+ /* Returns !0 if RR a should be strictly after RR b in the sort order,
+ * 0 otherwise. Must not fail.
+ */
+ } typeinfo;
+
+ typedef struct allocnode {
+ struct allocnode *next, *back;
+ } allocnode;
+
+ union maxalign {
+ byte d[1];
+ struct in_addr ia;
+ long l;
+ void *p;
+ void (*fp)(void);
+ union maxalign *up;
+ } __data;
+
+ typedef struct {
+ void *ext;
+ void (*callback)(adns_query parent, adns_query child);
+ union {
+ adns_rr_addr ptr_parent_addr;
+ adns_rr_hostaddr *hostaddr;
+ } info;
+ } qcontext;
+
+ struct adns__query {
+ adns_state ads;
+ enum { query_tosend, query_tcpw, query_childw, query_done } state;
+ adns_query back, next, parent;
+ struct { adns_query head, tail; } children;
+ struct { adns_query back, next; } siblings;
+ struct { allocnode *head, *tail; } allocations;
+ int interim_allocd, preserved_allocd;
+ void *final_allocspace;
+
+ const typeinfo *typei;
+ byte *query_dgram;
+ int query_dglen;
+
+ vbuf vb;
+ /* General-purpose messing-about buffer.
+ * Wherever a `big' interface is crossed, this may be corrupted/changed
+ * unless otherwise specified.
+ */
+
+ adns_answer *answer;
+ /* This is allocated when a query is submitted, to avoid being unable
+ * to relate errors to queries if we run out of memory. During
+ * query processing status, rrs is 0. cname is set if
+ * we found a cname (this corresponds to cname_dgram in the query
+ * structure). type is set from the word go. nrrs and rrs
+ * are set together, when we find how many rrs there are.
+ * owner is set during querying unless we're doing searchlist,
+ * in which case it is set only when we find an answer.
+ */
+
+ byte *cname_dgram;
+ int cname_dglen, cname_begin;
+ /* If non-0, has been allocated using . */
+
+ vbuf search_vb;
+ int search_origlen, search_pos, search_doneabs;
+ /* Used by the searching algorithm. The query domain in textual form
+ * is copied into the vbuf, and _origlen set to its length. Then
+ * we walk the searchlist, if we want to. _pos says where we are
+ * (next entry to try), and _doneabs says whether we've done the
+ * absolute query yet (0=not yet, 1=done, -1=must do straight away,
+ * but not done yet). If flags doesn't have adns_qf_search then
+ * the vbuf is initialised but empty and everything else is zero.
+ */
+
+ int id, flags, retries;
+ int udpnextserver;
+ unsigned long udpsent; /* bitmap indexed by server */
+ struct timeval timeout;
+ time_t expires; /* Earliest expiry time of any record we used. */
+
+ qcontext ctx;
+
+ /* Possible states:
+ *
+ * state Queue child id nextudpserver udpsent tcpfailed
+ *
+ * tosend NONE null >=0 0 zero zero
+ * tosend udpw null >=0 any nonzero zero
+ * tosend NONE null >=0 any nonzero zero
+ *
+ * tcpw tcpw null >=0 irrelevant any any
+ *
+ * child childw set >=0 irrelevant irrelevant irrelevant
+ * child NONE null >=0 irrelevant irrelevant irrelevant
+ * done output null -1 irrelevant irrelevant irrelevant
+ *
+ * Queries are only not on a queue when they are actually being processed.
+ * Queries in state tcpw/tcpw have been sent (or are in the to-send buffer)
+ * iff the tcp connection is in state server_ok.
+ *
+ * +------------------------+
+ * START -----> | tosend/NONE |
+ * +------------------------+
+ * / |\ \
+ * too big for UDP / UDP timeout \ \ send via UDP
+ * send via TCP / more retries \ \
+ * when conn'd / desired \ \
+ * | | |
+ * v | v
+ * +-----------+ +-------------+
+ * | tcpw/tcpw | ________ | tosend/udpw |
+ * +-----------+ \ +-------------+
+ * | | | UDP timeout | |
+ * | | | no more | |
+ * | | | retries | |
+ * \ | TCP died | desired | |
+ * \ \ no more | | |
+ * \ \ servers | TCP / |
+ * \ \ to try | timeout / |
+ * got \ \ v |_ | got
+ * reply \ _| +------------------+ / reply
+ * \ | done/output FAIL | /
+ * \ +------------------+ /
+ * \ /
+ * _| |_
+ * (..... got reply ....)
+ * / \
+ * need child query/ies / \ no child query
+ * / \
+ * |_ _|
+ * +---------------+ +----------------+
+ * | childw/childw | ----------------> | done/output OK |
+ * +---------------+ children done +----------------+
+ */
+ };
+
+ struct query_queue { adns_query head, tail; };
+
+ struct adns__state {
+ adns_initflags iflags;
+ FILE *diagfile;
+ int configerrno;
+ struct query_queue udpw, tcpw, childw, output;
+ adns_query forallnext;
+ int nextid, udpsocket, tcpsocket;
+ vbuf tcpsend, tcprecv;
+ int nservers, nsortlist, nsearchlist, searchndots, tcpserver, tcprecv_skip;
+ enum adns__tcpstate {
+ server_disconnected, server_connecting,
+ server_ok, server_broken
+ } tcpstate;
+ struct timeval tcptimeout;
+ /* This will have tv_sec==0 if it is not valid. It will always be
+ * valid if tcpstate _connecting. When _ok, it will be nonzero if
+ * we are idle (ie, tcpw queue is empty), in which case it is the
+ * absolute time when we will close the connection.
+ */
+ struct sigaction stdsigpipe;
+ sigset_t stdsigmask;
+ struct pollfd pollfds_buf[MAX_POLLFDS];
+ struct server {
+ struct in_addr addr;
+ } servers[MAXSERVERS];
+ struct sortlist {
+ struct in_addr base, mask;
+ } sortlist[MAXSORTLIST];
+ char **searchlist;
+ };
+
+ /* From setup.c: */
+
+ int adns__setnonblock(adns_state ads, int fd); /* => errno value */
+
+ /* From general.c: */
+
+ void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
+ int serv, adns_query qu, const char *fmt, va_list al);
+
+ void adns__debug(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(4,5);
+ void adns__warn(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(4,5);
+ void adns__diag(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(4,5);
+
+ int adns__vbuf_ensure(vbuf *vb, int want);
+ int adns__vbuf_appendstr(vbuf *vb, const char *_data); /* does not include nul */
+ 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);
+ void adns__vbuf_init(vbuf *vb);
+ void adns__vbuf_free(vbuf *vb);
+
+ const char *adns__diag_domain(adns_state ads, int serv, adns_query qu,
+ vbuf *vb, const byte *dgram, int dglen, int cbyte);
+ /* Unpicks a domain in a datagram and returns a string suitable for
+ * printing it as. Never fails - if an error occurs, it will
+ * return some kind of string describing the error.
+ *
+ * serv may be -1 and qu may be 0. vb must have been initialised,
+ * and will be left in an arbitrary consistent state.
+ *
+ * Returns either vb->buf, or a pointer to a string literal. Do not modify
+ * vb before using the return value.
+ */
+
+ void adns__isort(void *array, int nobjs, int sz, void *tempbuf,
+ int (*needswap)(void *context, const void *a, const void *b),
+ void *context);
+ /* Does an insertion sort of array which must contain nobjs objects
+ * each sz bytes long. tempbuf must point to a buffer at least
+ * sz bytes long. needswap should return !0 if a>b (strictly, ie
+ * wrong order) 0 if a<=b (ie, order is fine).
+ */
+
+ void adns__sigpipe_protect(adns_state);
+ void adns__sigpipe_unprotect(adns_state);
+ /* If SIGPIPE protection is not disabled, will block all signals except
+ * SIGPIPE, and set SIGPIPE's disposition to SIG_IGN. (And then restore.)
+ * Each call to _protect must be followed by a call to _unprotect before
+ * any significant amount of code gets to run, since the old signal mask
+ * is stored in the adns structure.
+ */
+
+ /* From transmit.c: */
+
+ adns_status adns__mkquery(adns_state ads, vbuf *vb, int *id_r,
+ const char *owner, int ol,
+ const typeinfo *typei, adns_queryflags flags);
+ /* Assembles a query packet in vb. A new id is allocated and returned.
+ */
+
+ adns_status adns__mkquery_frdgram(adns_state ads, vbuf *vb, int *id_r,
+ const byte *qd_dgram, int qd_dglen, int qd_begin,
+ adns_rrtype type, adns_queryflags flags);
+ /* Same as adns__mkquery, but takes the owner domain from an existing datagram.
+ * That domain must be correct and untruncated.
+ */
+
+ void adns__querysend_tcp(adns_query qu, struct timeval now);
+ /* Query must be in state tcpw/tcpw; it will be sent if possible and
+ * no further processing can be done on it for now. The connection
+ * might be broken, but no reconnect will be attempted.
+ */
+
+ 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.
+ * (Resulting state is one of udp/timew, tcpwait/timew (if server not connected),
+ * tcpsent/timew, child/childw or done/output.)
+ * __query_send may decide to use either UDP or TCP depending whether
+ * _qf_usevc is set (or has become set) and whether the query is too
+ * large.
+ */
+
+ /* From query.c: */
+
+ adns_status adns__internal_submit(adns_state ads, adns_query *query_r,
+ const typeinfo *typei, vbuf *qumsg_vb, int id,
+ adns_queryflags flags, struct timeval now,
+ const qcontext *ctx);
+ /* Submits a query (for internal use, called during external submits).
+ *
+ * The new query is returned in *query_r, or we return adns_s_nomemory.
+ *
+ * The query datagram should already have been assembled in qumsg_vb;
+ * the memory for it is _taken over_ by this routine whether it
+ * succeeds or fails (if it succeeds, the vbuf is reused for qu->vb).
+ *
+ * *ctx is copied byte-for-byte into the query.
+ *
+ * When the child query is done, ctx->callback will be called. The
+ * child will already have been taken off both the global list of
+ * queries in ads and the list of children in the parent. The child
+ * will be freed when the callback returns. The parent will have been
+ * taken off the global childw queue.
+ *
+ * The callback should either call adns__query_done, if it is
+ * complete, or adns__query_fail, if an error has occurred, in which
+ * case the other children (if any) will be cancelled. If the parent
+ * has more unfinished children (or has just submitted more) then the
+ * callback may choose to wait for them - it must then put the parent
+ * back on the childw queue.
+ */
+
+ void adns__search_next(adns_state ads, adns_query qu, struct timeval now);
+ /* Walks down the searchlist for a query with adns_qf_search.
+ * The query should have just had a negative response, or not had
+ * any queries sent yet, and should not be on any queue.
+ * The query_dgram if any will be freed and forgotten and a new
+ * one constructed from the search_* members of the query.
+ *
+ * Cannot fail (in case of error, calls adns__query_fail).
+ */
+
+ void *adns__alloc_interim(adns_query qu, size_t sz);
+ void *adns__alloc_preserved(adns_query qu, size_t sz);
+ /* Allocates some memory, and records which query it came from
+ * and how much there was.
+ *
+ * If an error occurs in the query, all the memory from _interim is
+ * simply freed. If the query succeeds, one large buffer will be made
+ * which is big enough for all these allocations, and then
+ * adns__alloc_final will get memory from this buffer.
+ *
+ * _alloc_interim can fail (and return 0).
+ * The caller must ensure that the query is failed.
+ *
+ * The memory from _preserved is is kept and transferred into the
+ * larger buffer - unless we run out of memory, in which case it too
+ * is freed. When you use _preserved you have to add code to the
+ * x_nomem error exit case in adns__makefinal_query to clear out the
+ * pointers you made to those allocations, because that's when they're
+ * thrown away; you should also make a note in the declaration of
+ * those pointer variables, to note that they are _preserved rather
+ * than _interim. If they're in the answer, note it here:
+ * answer->cname and answer->owner are _preserved.
+ */
+
+ void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz);
+ /* 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
+ * rather than the `from' query.
+ *
+ * It is legal to call adns__transfer_interim with a null pointer; this
+ * has no effect.
+ *
+ * _transfer_interim also ensures that the expiry time of the `to' query
+ * is no later than that of the `from' query, so that child queries'
+ * TTLs get inherited by their parents.
+ */
+
+ 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
+ * will be freed when we're done with the query.
+ */
+
+ void *adns__alloc_final(adns_query qu, size_t sz);
+ /* Cannot fail, and cannot return 0.
+ */
+
+ void adns__makefinal_block(adns_query qu, void **blpp, size_t sz);
+ void adns__makefinal_str(adns_query qu, char **strp);
+
+ void adns__reset_preserved(adns_query qu);
+ /* Resets all of the memory management stuff etc. to take account of
+ * only the _preserved stuff from _alloc_preserved. Used when we find
+ * an error somewhere and want to just report the error (with perhaps
+ * CNAME, owner, etc. info), and also when we're halfway through RRs
+ * in a datagram and discover that we need to retry the query.
+ */
+
+ void adns__query_done(adns_query qu);
+ void adns__query_fail(adns_query qu, adns_status stat);
+
+ /* From reply.c: */
+
+ void adns__procdgram(adns_state ads, const byte *dgram, int len,
+ int serv, int viatcp, struct timeval now);
+ /* This function is allowed to cause new datagrams to be constructed
+ * and sent, or even new queries to be started. However,
+ * query-sending functions are not allowed to call any general event
+ * loop functions in case they accidentally call this.
+ *
+ * Ie, receiving functions may call sending functions.
+ * Sending functions may NOT call receiving functions.
+ */
+
+ /* From types.c: */
+
+ const typeinfo *adns__findtype(adns_rrtype type);
+
+ /* From parse.c: */
+
+ typedef struct {
+ adns_state ads;
+ adns_query qu;
+ int serv;
+ const byte *dgram;
+ int dglen, max, cbyte, namelen;
+ int *dmend_r;
+ } findlabel_state;
+
+ void adns__findlabel_start(findlabel_state *fls, adns_state ads,
+ int serv, adns_query qu,
+ const byte *dgram, int dglen, int max,
+ int dmbegin, int *dmend_rlater);
+ /* Finds labels in a domain in a datagram.
+ *
+ * Call this routine first.
+ * dmend_rlater may be null. ads (and of course fls) may not be.
+ * serv may be -1, qu may be null - they are for error reporting.
+ */
+
+ 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.
+ */
+
+ typedef enum {
+ pdf_quoteok= 0x001
+ } parsedomain_flags;
+
+ adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu,
+ vbuf *vb, parsedomain_flags flags,
+ 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.
+ *
+ * serv may be -1 and qu may be 0 - they are used for error reporting only.
+ */
+
+ adns_status adns__parse_domain_more(findlabel_state *fls, adns_state ads,
+ adns_query qu, vbuf *vb, parsedomain_flags flags,
+ const byte *dgram);
+ /* Like adns__parse_domain, but you pass it a pre-initialised findlabel_state,
+ * for continuing an existing domain or some such of some kind. Also, unlike
+ * _parse_domain, the domain data will be appended to vb, rather than replacing
+ * the existing contents.
+ */
+
+ adns_status adns__findrr(adns_query qu, int serv,
+ const byte *dgram, int dglen, int *cbyte_io,
+ int *type_r, int *class_r, unsigned long *ttl_r,
+ int *rdlen_r, int *rdstart_r,
+ int *ownermatchedquery_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, TTL and RRdata length and start are returned iff
+ * the corresponding pointer variables are not null. type_r, class_r
+ * and ttl_r may not be null. The TTL will be capped.
+ *
+ * If ownermatchedquery_r != 0 then the owner domain of this
+ * RR will be compared with that in the query (or, if the query
+ * has gone to a CNAME lookup, with the canonical name).
+ * In this case, *ownermatchedquery_r will be set to 0 or 1.
+ * The query datagram (or CNAME datagram) MUST be valid and not truncated.
+ *
+ * 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.
+ *
+ * qu must obviously be non-null.
+ *
+ * If an error is returned then *type_r will be undefined too.
+ */
+
+ adns_status adns__findrr_anychk(adns_query qu, int serv,
+ const byte *dgram, int dglen, int *cbyte_io,
+ int *type_r, int *class_r, unsigned long *ttl_r,
+ int *rdlen_r, int *rdstart_r,
+ const byte *eo_dgram, int eo_dglen, int eo_cbyte,
+ int *eo_matched_r);
+ /* Like adns__findrr_checked, except that the datagram and
+ * owner to compare with can be specified explicitly.
+ *
+ * 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.
+ */
+
+ void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now);
+ /* Updates the `expires' field in the query, so that it doesn't exceed
+ * now + ttl.
+ */
+
+ int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len);
+
+ /* From event.c: */
+
+ void adns__tcp_broken(adns_state ads, const char *what, const char *why);
+ /* what and why may be both 0, or both non-0. */
+
+ void adns__tcp_tryconnect(adns_state ads, struct timeval now);
+
+ void adns__autosys(adns_state ads, struct timeval now);
+ /* Make all the system calls we want to if the application wants us to.
+ * Must not be called from within adns internal processing functions,
+ * lest we end up in recursive descent !
+ */
+
+ void adns__must_gettimeofday(adns_state ads, const struct timeval **now_io,
+ struct timeval *tv_buf);
+
+ int adns__pollfds(adns_state ads, struct pollfd pollfds_buf[MAX_POLLFDS]);
+ void adns__fdevents(adns_state ads,
+ const struct pollfd *pollfds, int npollfds,
+ int maxfd, const fd_set *readfds,
+ const fd_set *writefds, const fd_set *exceptfds,
+ struct timeval now, int *r_r);
+ int adns__internal_check(adns_state ads,
+ adns_query *query_io,
+ adns_answer **answer,
+ void **context_r);
+
+ void adns__timeouts(adns_state ads, int act,
+ struct timeval **tv_io, struct timeval *tvbuf,
+ struct timeval now);
+ /* If act is !0, then this will also deal with the TCP connection
+ * if previous events broke it or require it to be connected.
+ */
+
+ /* From check.c: */
+
+ void adns__consistency(adns_state ads, adns_query qu, consistency_checks cc);
+
+ /* Useful static inline functions: */
+ #define ctype_whitespace(c) ((c)==' ' || (c)=='\n' || (c)=='\t')
+ #define ctype_digit(c) ((c)>='0' && (c)<='9')
+ #define ctype_alpha(c) (((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
+ #define ctype_822special(c) (strchr("()<>@,;:\\\".[]",(c)) != 0)
+ #define ctype_domainunquoted(c) (ctype_alpha(c) || ctype_digit(c) || (strchr("-_/+",c) != 0))
+ #define errno_resources(e) ((e)==ENOMEM || (e)==ENOBUFS)
+
+ /* Useful macros */
+
+ #define MEM_ROUND(sz) \
+ (( ((sz)+sizeof(union maxalign)-1) / sizeof(union maxalign) ) \
+ * sizeof(union maxalign) )
+
+ #define GETIL_B(cb) (((dgram)[(cb)++]) & 0x0ff)
+ #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))
+ #define GET_L(cb,tv) ( (tv)=0, \
+ (tv)|=(GETIL_B((cb))<<24), \
+ (tv)|=(GETIL_B((cb))<<16), \
+ (tv)|=(GETIL_B((cb))<<8), \
+ (tv)|=GETIL_B(cb), \
+ (tv) )
+
+ /* Misc */
+ extern void _adns_timevaladd(struct timeval *tv_io, long ms);
+
+ #endif
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