-/**/
+/*
+ * internal.h
+ * - declarations of private objects with external linkage (adns__*)
+ * - definitons of internal macros
+ * - comments regarding library data structures
+ */
+/*
+ * This file is part of adns, which is Copyright (C) 1997, 1998 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
+ * 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
+#define PRINTFFORMAT(a,b) __attribute__((format(printf,a,b)))
+typedef unsigned char byte;
+
+#include <stdarg.h>
+#include <assert.h>
+#include <unistd.h>
+
#include <sys/time.h>
#include "adns.h"
/* Configuration and constants */
#define MAXSERVERS 5
-#define MAXUDPRETRIES 15
+#define UDPMAXRETRIES /*15*/5
#define UDPRETRYMS 2000
#define TCPMS 30000
#define LOCALRESOURCEMS 20
-#define UDPMAXDGRAM 512
-#define NSPORT 53
+
+#define DNS_PORT 53
+#define DNS_MAXUDP 512
+#define DNS_MAXDOMAIN 255
+#define DNS_HDRSIZE 12
+#define DNS_CLASS_IN 1
+
+typedef enum {
+ rcode_noerror,
+ rcode_formaterror,
+ rcode_servfail,
+ rcode_nxdomain,
+ rcode_notimp,
+ rcode_refused
+} dns_rcode;
/* Shared data structures */
-union adns__align {
+typedef union {
adns_status status;
char *cp;
adns_rrtype type;
- int int;
+ int i;
struct in_addr ia;
unsigned long ul;
-};
+} rr_align;
+
+typedef struct {
+ int used, avail;
+ byte *buf;
+} vbuf;
+
+typedef union {
+ void *ext;
+ int dmaddr_index;
+} qcontext;
+
+typedef struct {
+ adns_rrtype type;
+ const char *name;
+ int rrsz;
+
+ adns_status (*parse)(adns_query qu, int serv,
+ const byte *dgram, int dglen, 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.
+ */
+
+ void (*makefinal)(adns_query qu, void *data);
+ /* Change memory management of *data.
+ * Previously, used alloc_interim, now use alloc_final.
+ */
+} typeinfo;
+
+typedef struct allocnode {
+ struct allocnode *next;
+} allocnode;
+
+union maxalign {
+ byte d[1];
+ struct in_addr ia;
+ long l;
+ void *p;
+ void (*fp)(void);
+ union maxalign *up;
+} data;
struct adns__query {
- /* FIXME: make sure this is all init'd properly */
+ adns_state ads;
enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
- adns_query back, next;
- adns_query parent;
+ adns_query back, next, parent;
struct { adns_query head, tail; } children;
struct { adns_query back, next; } siblings;
- adns_rrtype type;
+ struct allocnode *allocations;
+ int interim_allocd;
+ void *final_allocspace;
+
+ const typeinfo *typei;
+ char *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;
- size_t ansalloc; ansused;
+ /* 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.
+ */
+
+ byte *cname_dgram;
+ int cname_dglen, cname_begin;
+ /* If non-0, has been allocated using . */
+
int id, flags, udpretries;
- int nextudpserver;
- unsigned long sentudp, failedtcp; /* bitmap indexed by server */
+ int udpnextserver;
+ unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
struct timeval timeout;
- void *context;
- unsigned char *querymsg;
- int querylen;
- char owner[1];
- /* After the owner name and nul comes the query message */
+ qcontext context;
/* Possible states:
*
- * state Queue child id answer nextudpserver sentudp failedtcp
- *
- * udp NONE null >=0 null 0 zero zero
- * udp timew null >=0 null any nonzero zero
- * udp NONE null >=0 null any nonzero zero
- *
- * tcpwait timew null >=0 null irrelevant zero any
- * tcpsent timew null >=0 null irrelevant zero any
- *
- * child childw set >=0 partial irrelevant irrelevant irrelevant
- * done output null -1 set/null irrelevant irrelevant irrelevant
+ * state Queue child id nextudpserver sentudp failedtcp
+ *
+ * udp NONE null >=0 0 zero zero
+ * udp timew null >=0 any nonzero zero
+ * udp NONE null >=0 any nonzero zero
+ *
+ * tcpwait timew null >=0 irrelevant zero any
+ * tcpsent timew null >=0 irrelevant zero any
+ *
+ * child childw set >=0 irrelevant irrelevant irrelevant
+ * done output null -1 irrelevant irrelevant irrelevant
*
* +------------------------+
* START -----> | udp/NONE |
*/
};
-typedef struct {
- size_t used, avail;
- unsigned char *buf;
-} adns__vbuf;
-
struct adns__state {
- /* FIXME: make sure this is all init'd properly */
adns_initflags iflags;
FILE *diagfile;
struct { adns_query head, tail; } timew, childw, output;
- int nextid, udpsocket;
- adns_vbuf rqbuf, tcpsend, tcprecv;
+ int nextid, udpsocket, tcpsocket;
+ vbuf tcpsend, tcprecv;
int nservers, tcpserver;
enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
- int tcpsocket;
struct timeval tcptimeout;
struct server {
struct in_addr addr;
/* From setup.c: */
-void adns__vdiag(adns_state ads, adns_initflags prevent, const char *pfx,
- int serv, const char *fmt, va_list al);
-void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
-void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
-void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
+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);
-static inline int adns__vbuf_ensure(adns__vbuf *vb, size_t want);
-int adns__vbuf_append(adns__vbuf *vb, const byte *data, size_t len);
-int adns__vbuf_appendq(adns__vbuf *vb, const byte *data, size_t len);
+int adns__vbuf_ensure(vbuf *vb, int want);
+int adns__vbuf_appendstr(vbuf *vb, const char *data);
+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);
-/* From submit.c: */
+const char *adns__diag_domain(adns_state ads, int serv, adns_query qu, vbuf *vb,
+ int flags, 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.
+ */
+
+/* From transmit.c: */
-void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
+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. */
+
+void adns__query_tcp(adns_query qu, struct timeval now);
+/* Query must be in state tcpwait/timew; it will be moved to a new state
+ * if possible and no further processing can be done on it for now.
+ * (Resulting state is one of tcpwait/timew (if server not connected),
+ * tcpsent/timew, child/childw or done/output.)
+ *
+ * adns__tcp_tryconnect should already have been called - _tcp
+ * will only use an existing connection (if there is one), which it
+ * may break. If the conn list lost then the caller is responsible for any
+ * reestablishment and retry.
+ */
+
+void adns__query_udp(adns_query qu, struct timeval now);
+/* Query must be in state udp/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.)
+ */
/* From query.c: */
-void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
-void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
-adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
- adns_rrtype type, adns_queryflags flags, int *qml_r);
+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);
+/* 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).
+ *
+ * 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.
+ */
+
+void *adns__alloc_interim(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 its memory 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, in which case it will fail the query too,
+ * so nothing more need be done with it.
+ */
+
+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.
+ */
+
+void adns__makefinal_block(adns_query qu, void **blpp, size_t sz);
+void adns__makefinal_str(adns_query qu, char **strp);
+
+void adns__reset_cnameonly(adns_query qu);
+/* Resets all of the memory management stuff etc. to
+ * take account of only the CNAME. Used when we find an error somewhere
+ * and want to just report the error (with perhaps CNAME 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, struct timeval now);
+
+/* 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.
+ */
+
+adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu,
+ vbuf *vb, int 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__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 *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.
+ *
+ * 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.
+ */
+
+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_tryconnect(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. */
/* Useful static inline functions: */
struct timeval tmp;
assert(ms>=0);
tmp= *tv_io;
- tmp.tv_usec += (ms%1000)*1000;
+ tmp.tv_usec += (ms%1000)*1000000;
tmp.tv_sec += ms/1000;
- if (tmp.tv_usec >= 1000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
+ if (tmp.tv_usec >= 1000000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
*tv_io= tmp;
}
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');
+}
/* Useful macros */
+#define MEM_ROUND(sz) \
+ (( ((sz)+sizeof(union maxalign)-1) / sizeof(union maxalign) ) \
+ * sizeof(union maxalign) )
+
+#define LIST_INIT(list) ((list).head= (list).tail= 0)
+
#define LIST_UNLINK_PART(list,node,part) \
do { \
if ((node)->back) (node)->back->part next= (node)->part next; \
} while(0)
#define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
-#define LIST_LINK_TAIL_PART(list,node) LIST_LINK_TAIL(list,node,)
+#define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)
+
+#define GETIL_B(cb) (dgram[(cb)++])
+#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))
#endif
~ianmdlvl / adns.git / blobdiff