* - comments regarding library data structures
*/
/*
- * This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
+ * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
*
* 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
#ifndef ADNS_INTERNAL_H_INCLUDED
#define ADNS_INTERNAL_H_INCLUDED
-#define PRINTFFORMAT(a,b) __attribute__((format(printf,a,b)))
+#include "config.h"
typedef unsigned char byte;
#include <stdarg.h>
#include <assert.h>
#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
#include <sys/time.h>
/* Configuration and constants */
#define MAXSERVERS 5
-#define UDPMAXRETRIES /*15*/5
+#define MAXSORTLIST 15
+#define UDPMAXRETRIES 15
#define UDPRETRYMS 2000
#define TCPMS 30000
-#define LOCALRESOURCEMS 20
+#define MAXTTLBELIEVE (7*86400) /* any TTL > 7 days is capped */
#define DNS_PORT 53
#define DNS_MAXUDP 512
#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 {
rcode_noerror,
rcode_formaterror,
* nsstart is the offset of the authority section.
*/
- int (*diff_needswap)(const void *datap_a, const void *datap_b);
+ 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.
*/
struct { allocnode *head, *tail; } allocations;
int interim_allocd;
void *final_allocspace;
-
+
const typeinfo *typei;
byte *query_dgram;
int query_dglen;
* 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, udpretries;
int udpnextserver;
unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
struct timeval timeout;
+ time_t expires; /* Earliest expiry time of any record we used. */
qcontext ctx;
* tcpsent timew null >=0 irrelevant zero 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.
+ *
* +------------------------+
* START -----> | udp/NONE |
* +------------------------+
struct adns__state {
adns_initflags iflags;
FILE *diagfile;
+ int configerrno;
struct { adns_query head, tail; } timew, childw, output;
+ adns_query forallnext;
int nextid, udpsocket, tcpsocket;
vbuf tcpsend, tcprecv;
- int nservers, tcpserver;
+ int nservers, nsortlist, nsearchlist, searchndots, tcpserver;
enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
struct timeval tcptimeout;
+ 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: */
*/
void adns__isort(void *array, int nobjs, int sz, void *tempbuf,
- int (*needswap)(const void *a, const void *b));
+ 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.
+ */
+
/* 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, and returns id at *id_r. */
+/* 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,
/* From query.c: */
-int adns__internal_submit(adns_state ads, adns_query *query_r,
- const typeinfo *typei, vbuf *qumsg_vb, int id,
- adns_queryflags flags, struct timeval now,
- adns_status failstat, const qcontext *ctx);
+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 memory for it is _taken over_ by this routine whether it
* succeeds or fails (if it succeeds, the vbuf is reused for qu->vb).
*
- * If failstat is nonzero then if we are successful in creating the query
- * it is immediately failed with code failstat (but _submit still succeds).
- *
* *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 iff this is the last child for
+ * that parent. If there is no error detected in the callback, then
+ * it should call adns__query_done if and only if there are no more
+ * children (by checking parent->children.head). If an error is
+ * detected in the callback it should call adns__query_fail and any
+ * remaining children will automatically be cancelled.
+ */
+
+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);
*
* 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);
* 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, int *rdlen_r, int *rdstart_r,
+ 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 and RRdata length and start are returned iff
- * the corresponding pointer variables are not null. type_r and
- * class_r may not be null.
+ * 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
adns_status adns__findrr_anychk(adns_query qu, int serv,
const byte *dgram, int dglen, int *cbyte_io,
- int *type_r, int *class_r, int *rdlen_r, int *rdstart_r,
+ 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
* 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);
+void adns__tcp_closenext(adns_state ads);
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. */
+void adns__must_gettimeofday(adns_state ads, const struct timeval **now_io,
+ struct timeval *tv_buf);
+void adns__timeouts(adns_state ads, int act,
+ struct timeval **tv_io, struct timeval *tvbuf,
+ struct timeval now);
+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);
+
/* Useful static inline functions: */
static inline void timevaladd(struct timeval *tv_io, long ms) {
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');
+ return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
+static inline int errno_resources(int e) { return e==ENOMEM || e==ENOBUFS; }
+
/* Useful macros */
#define MEM_ROUND(sz) \
* sizeof(union maxalign) )
#define LIST_INIT(list) ((list).head= (list).tail= 0)
+#define LINK_INIT(link) ((link).next= (link).back= 0)
#define LIST_UNLINK_PART(list,node,part) \
do { \
#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) )
#endif
~ianmdlvl / adns.git / blobdiff