#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;
+ int rrsz;
+ adns_status (*parse)(adns_state ads, adns_query qu, int serv, vbuf *vb,
+ 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.
+ *
+ * This function may use vb (which has been initialised) however it likes.
+ */
+} typeinfo;
struct adns__query {
/* FIXME: make sure this is all init'd properly */
- adns_query back, next;
- adns_query parent;
+ enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
+ adns_query back, next, parent;
struct { adns_query head, tail; } children;
struct { adns_query back, next; } siblings;
- adns_rrtype type;
- adns_answer *answer;
- size_t ansalloc; ansused;
- int id, flags, udpretries; /* udpretries==-1 => _f_usevc or too big for UDP */
- int nextudpserver;
- unsigned long sentudp, senttcp; /* bitmaps indexed by server */
- struct timeval timeout;
- void *context;
- unsigned char *querymsg;
+
+ const typeinfo *typei;
+
+#error make sure all this is init'd properly
+#error make sure all this is freed properly
+ byte *querymsg;
int querylen;
+
+ vbuf ansbuf; /* Used for answer RRs */
+ char *cname_str;
+ byte *cname_dgram;
+ int cname_dglen, cname_begin;
+
+ int id, flags, udpretries;
+ int udpnextserver;
+ unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
+ struct timeval timeout;
+ qcontext context;
char owner[1];
+ /* After the owner name and nul comes the query message, pointed to by querymsg */
+
/* Possible states:
- * Queue child id answer nextserver sentudp senttcp
- * tosend null >=0 null any any any
- * timew null >=0 null any at least 1 bit set any
- * childw set >=0 partial any any any
- * output null -1 set/null any any any
+ *
+ * state Queue child id ansbuf 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
+ *
+ * +------------------------+
+ * START -----> | udp/NONE |
+ * +------------------------+
+ * / |\ \
+ * too big for UDP / UDP timeout \ \ send via UDP
+ * do this ASAP! / more retries \ \ do this ASAP!
+ * |_ desired \ _|
+ * +---------------+ +-----------+
+ * | tcpwait/timew | ____ | udp/timew |
+ * +---------------+ \ +-----------+
+ * | ^ | | |
+ * TCP conn'd; | | TCP died | | |
+ * send via TCP | | more | UDP timeout | |
+ * do this ASAP! | | servers | no more | |
+ * v | to try | retries | |
+ * +---------------+ | desired | |
+ * | tcpsent/timew | ____ | | |
+ * +---------------+ \| | |
+ * \ \ TCP died | TCP | |
+ * \ \ no more | timeout / |
+ * \ \ servers | / |
+ * \ \ to try | / |
+ * got \ \ v |_ / got
+ * reply \ _| +------------------+ / reply
+ * \ | done/output FAIL | /
+ * \ +------------------+ /
+ * \ /
+ * _| |_
+ * (..... got reply ....)
+ * / \
+ * need child query/ies / \ no child query
+ * / \
+ * |_ _|
+ * +--------------+ +----------------+
+ * | child/childw | ----------------> | done/output OK |
+ * +--------------+ children done +----------------+
*/
};
-struct adns__vbuf {
- size_t used, avail;
- unsigned char *buf;
-};
-
struct adns__state {
- /* FIXME: make sure this is all init'd properly */
adns_initflags iflags;
FILE *diagfile;
- struct { adns_query head, tail; } tosend, timew, childw, output;
- int nextid, udpsocket;
- adns_vbuf rqbuf, tcpsend, tcprecv;
+ struct { adns_query head, tail; } timew, childw, output;
+ int nextid, udpsocket, tcpsocket;
+ vbuf rqbuf, tcpsend, tcprecv;
int nservers, tcpserver;
- enum adns__tcpstate { server_disc, server_connecting, server_ok } tcpstate;
- int tcpsocket;
+ enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
struct timeval tcptimeout;
struct server {
struct in_addr addr;
/* From setup.c: */
-void adns__vdiag(adns_state ads, adns_initflags prevent, const char *pfx,
+void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
int serv, const char *fmt, va_list al);
-void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(2,3);
-void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(2,3);
-void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(2,3);
+
+void adns__debug(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(3,4);
+void adns__warn(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(3,4);
+void adns__diag(adns_state ads, int serv, adns_query qu,
+ const char *fmt, ...) PRINTFFORMAT(3,4);
+
+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);
+
+int adns__setnonblock(adns_state ads, int fd); /* => errno value */
/* From submit.c: */
+void adns__query_nomem(adns_state ads, adns_query qu);
+void adns__query_finish(adns_state ads, adns_query qu, adns_status stat);
void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
/* From query.c: */
-void adns__quproc_tosend(adns_state ads, adns_query qu, struct timeval now) {
+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,
+ const typeinfo *typei, adns_queryflags flags);
+
+/* 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, int serv;
+ const byte *dgram;
+ int dglen, max, cbyte, namelen;
+ int *dmend_rlater, *namelen_rlater;
+} findlabel_state;
+
+void adns__findlabel_start(findlabel_state *fls,
+ adns_state ads, int serv,
+ const byte *dgram, int dglen, int max,
+ int dmbegin, int *dmend_rlater);
+/* Finds labels in a domain in a datagram.
+ *
+ * Call this routine first.
+ * endpoint_rlater may be null.
+ */
+
+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, vbuf *vb,
+ 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.
+ */
+
+adns_status adns__findrr(adns_state ads, int serv,
+ const byte *dgram, int dglen, int *cbyte_io,
+ int *type_r, int *class_r, int *rdlen_r, int *rdstart_r,
+ const byte *eo_dgram, int eo_dglen, int eo_cbyte,
+ int *eo_matched_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 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.
+ *
+ * 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.
+ *
+ * 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, struct timeval now);
+void adns__autosys(adns_state ads, struct timeval now);
/* 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 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