[adns] / src / internal.h

/**/

#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 UDPMAXRETRIES /*15*/5
#define UDPRETRYMS 2000
#define TCPMS 30000
#define LOCALRESOURCEMS 20

#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 */

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 union {
  void *ext;
  int dmaddr_index;
} qcontext;

typedef struct {
  adns_rrtype type;
  int rrsz;
  adns_status (*get_fn)(adns_state ads, adns_query qu, int serv,
			const byte *dgram, int dglen,
			int *cbyte_io, int max,
			int nsstart, int arcount, int *arstart_io,
			int roff, int *rcount_io);
} typeinfo;

struct adns__query {
  /* FIXME: make sure this is all init'd properly */
  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;
  
  const typeinfo *typei;
  vbuf ans;
  int id, flags, udpretries;
  int udpnextserver;
  unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
  struct timeval timeout;
  byte *querymsg;
  int querylen, cnameoff, rrsoff;
  qcontext context;
  char owner[1];
  /* After the owner name and nul comes the query message, pointed to by querymsg */

  /* 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
   *
   *			      +------------------------+
   *             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__state {
  adns_initflags iflags;
  FILE *diagfile;
  struct { adns_query head, tail; } timew, childw, output;
  int nextid, udpsocket, tcpsocket;
  vbuf rqbuf, tcpsend, tcprecv;
  int nservers, tcpserver;
  enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
  struct timeval tcptimeout;
  struct server {
    struct in_addr addr;
  } servers[MAXSERVERS];
};

/* From setup.c: */

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(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__vbuf_ensure(vbuf *vb, int want);
int adns__vbuf_append(vbuf *vb, const byte *data, int len);
int adns__vbuf_malloc(vbuf *vb, size_t 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__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: */

int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len);

adns_status adns__get_label(const byte *dgram, int dglen, int *max_io,
			    int *cbyte_io, int *lablen_r, int *labstart_r,
			    int *namelen_io);
adns_status adns__get_domain_perm(adns_state ads, adns_query qu, int serv,
				  const byte *dgram, int dglen,
				  int *cbyte_io, int max, int *domainstart_r);
adns_status adns__get_domain_temp(adns_state ads, adns_query qu, int serv,
				  const byte *dgram, int dglen,
				  int *cbyte_io, int max, int *domainstart_r);
adns_status adns__get_rr_temp(adns_state ads, 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,
			      const byte *eo_dgram, int eo_dglen, int eo_cbyte,
			      int *eo_matched_r);

/* 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: */

static inline void timevaladd(struct timeval *tv_io, long ms) {
  struct timeval tmp;
  assert(ms>=0);
  tmp= *tv_io;
  tmp.tv_usec += (ms%1000)*1000000;
  tmp.tv_sec += ms/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; \
      else                        (list).head= (node)->part next; \
    if ((node)->next) (node)->next->part back= (node)->part back; \
      else                        (list).tail= (node)->part back; \
  } while(0)

#define LIST_LINK_TAIL_PART(list,node,part) \
  do { \
    (node)->part back= 0; \
    (node)->part next= (list).tail; \
    if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
    (list).tail= (node); \
  } while(0)

#define LIST_UNLINK(list,node) LIST_UNLINK_PART(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
Commit	Line	Data
37e28fde	1	/**/
	2
	3	#ifndef ADNS_INTERNAL_H_INCLUDED
	4	#define ADNS_INTERNAL_H_INCLUDED
	5
4353a5c4	6	#define PRINTFFORMAT(a,b) __attribute__((format(printf,a,b)))
	7	typedef unsigned char byte;
	8
	9	#include <stdarg.h>
	10	#include <assert.h>
	11	#include <unistd.h>
	12
37e28fde	13	#include <sys/time.h>
	14
	15	#include "adns.h"
	16
	17	/* Configuration and constants */
	18
	19	#define MAXSERVERS 5
b9de380c	20	#define UDPMAXRETRIES /15/5
37e28fde	21	#define UDPRETRYMS 2000
	22	#define TCPMS 30000
	23	#define LOCALRESOURCEMS 20
b9de380c	24
98a3f706	25	#define DNS_PORT 53
b9de380c	26	#define DNS_MAXUDP 512
	27	#define DNS_MAXDOMAIN 255
	28	#define DNS_HDRSIZE 12
	29	#define DNS_CLASS_IN 1
37e28fde	30
98a3f706	31	typedef enum {
	32	rcode_noerror,
	33	rcode_formaterror,
	34	rcode_servfail,
	35	rcode_nxdomain,
	36	rcode_notimp,
	37	rcode_refused
	38	} dns_rcode;
	39
37e28fde	40	/* Shared data structures */
37e28fde	41
4353a5c4	42	typedef union {
37e28fde	43	adns_status status;
	44	char *cp;
	45	adns_rrtype type;
4353a5c4	46	int i;
37e28fde	47	struct in_addr ia;
37e28fde	48	unsigned long ul;
4353a5c4	49	} rr_align;
	50
	51	typedef struct {
	52	int used, avail;
	53	byte *buf;
	54	} vbuf;
	55
	56	typedef union {
	57	void *ext;
	58	int dmaddr_index;
	59	} qcontext;
37e28fde	60
0ba0614a	61	typedef struct {
0ba0614a	62	adns_rrtype type;
98a3f706	63	int rrsz;
	64	adns_status (*get_fn)(adns_state ads, adns_query qu, int serv,
	65	const byte *dgram, int dglen,
	66	int *cbyte_io, int max,
	67	int nsstart, int arcount, int *arstart_io,
	68	int roff, int *rcount_io);
0ba0614a	69	} typeinfo;
0ba0614a	70
37e28fde	71	struct adns__query {
37e28fde	72	/* FIXME: make sure this is all init'd properly */
ddfda861	73	enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
4353a5c4	74	adns_query back, next, parent;
37e28fde	75	struct { adns_query head, tail; } children;
37e28fde	76	struct { adns_query back, next; } siblings;
0ba0614a	77
0ba0614a	78	const typeinfo *typei;
b9de380c	79	vbuf ans;
ddfda861	80	int id, flags, udpretries;
4353a5c4	81	int udpnextserver;
4353a5c4	82	unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
37e28fde	83	struct timeval timeout;
4353a5c4	84	byte *querymsg;
98a3f706	85	int querylen, cnameoff, rrsoff;
4353a5c4	86	qcontext context;
37e28fde	87	char owner[1];
4353a5c4	88	/* After the owner name and nul comes the query message, pointed to by querymsg */
ddfda861	89
37e28fde	90	/* Possible states:
ddfda861	91	*
	92	* state Queue child id answer nextudpserver sentudp failedtcp
	93	*
	94	* udp NONE null >=0 null 0 zero zero
	95	* udp timew null >=0 null any nonzero zero
	96	* udp NONE null >=0 null any nonzero zero
	97	*
	98	* tcpwait timew null >=0 null irrelevant zero any
	99	* tcpsent timew null >=0 null irrelevant zero any
	100	*
	101	* child childw set >=0 partial irrelevant irrelevant irrelevant
	102	* done output null -1 set/null irrelevant irrelevant irrelevant
	103	*
	104	* +------------------------+
	105	* START -----> \| udp/NONE \|
	106	* +------------------------+
	107	* / \|\ \
	108	* too big for UDP / UDP timeout \ \ send via UDP
	109	* do this ASAP! / more retries \ \ do this ASAP!
	110	* \|_ desired \ _\|
	111	* +---------------+ +-----------+
	112	* \| tcpwait/timew \| ____ \| udp/timew \|
	113	* +---------------+ \ +-----------+
	114	* \| ^ \| \| \|
	115	* TCP conn'd; \| \| TCP died \| \| \|
	116	* send via TCP \| \| more \| UDP timeout \| \|
	117	* do this ASAP! \| \| servers \| no more \| \|
	118	* v \| to try \| retries \| \|
	119	* +---------------+ \| desired \| \|
	120	* \| tcpsent/timew \| ____ \| \| \|
	121	* +---------------+ \\| \| \|
	122	* \ \ TCP died \| TCP \| \|
	123	* \ \ no more \| timeout / \|
	124	* \ \ servers \| / \|
	125	* \ \ to try \| / \|
	126	* got \ \ v \|_ / got
	127	* reply \ _\| +------------------+ / reply
	128	* \ \| done/output FAIL \| /
	129	* \ +------------------+ /
	130	* \ /
	131	* _\| \|_
	132	* (..... got reply ....)
	133	* / \
	134	* need child query/ies / \ no child query
	135	* / \
	136	* \|_ _\|
	137	* +--------------+ +----------------+
	138	* \| child/childw \| ----------------> \| done/output OK \|
	139	* +--------------+ children done +----------------+
37e28fde	140	*/
	141	};
	142
37e28fde	143	struct adns__state {
37e28fde	144	adns_initflags iflags;
37e28fde	145	FILE *diagfile;
ddfda861	146	struct { adns_query head, tail; } timew, childw, output;
4353a5c4	147	int nextid, udpsocket, tcpsocket;
4353a5c4	148	vbuf rqbuf, tcpsend, tcprecv;
37e28fde	149	int nservers, tcpserver;
8402e34c	150	enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
37e28fde	151	struct timeval tcptimeout;
	152	struct server {
	153	struct in_addr addr;
	154	} servers[MAXSERVERS];
	155	};
	156
	157	/* From setup.c: */
	158
4353a5c4	159	void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
37e28fde	160	int serv, const char *fmt, va_list al);
8402e34c	161	void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
	162	void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
	163	void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
37e28fde	164
4353a5c4	165	int adns__vbuf_ensure(vbuf *vb, int want);
4353a5c4	166	int adns__vbuf_append(vbuf vb, const byte data, int len);
98a3f706	167	int adns__vbuf_malloc(vbuf *vb, size_t len);
ddfda861	168	/* 1=>success, 0=>realloc failed */
4353a5c4	169	void adns__vbuf_appendq(vbuf vb, const byte data, int len);
	170	void adns__vbuf_init(vbuf *vb);
	171
	172	int adns__setnonblock(adns_state ads, int fd); /* => errno value */
ddfda861	173
37e28fde	174	/* From submit.c: */
37e28fde	175
4353a5c4	176	void adns__query_nomem(adns_state ads, adns_query qu);
98a3f706	177	void adns__query_finish(adns_state ads, adns_query qu, adns_status stat);
37e28fde	178	void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
	179
	180	/* From query.c: */
	181
ddfda861	182	void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
ddfda861	183	void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
4bec51a4	184	adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
98a3f706	185	const typeinfo *typei, adns_queryflags flags);
4353a5c4	186
	187	/* From reply.c: */
	188
98a3f706	189	void adns__procdgram(adns_state ads, const byte *dgram, int len,
	190	int serv, struct timeval now);
	191
	192	/* From types.c: */
	193
	194	const typeinfo *adns__findtype(adns_rrtype type);
	195
	196	/* From parse.c: */
	197
	198	int vbuf__append_quoted1035(vbuf vb, const byte buf, int len);
	199
	200	adns_status adns__get_label(const byte dgram, int dglen, int max_io,
	201	int cbyte_io, int lablen_r, int *labstart_r,
	202	int *namelen_io);
	203	adns_status adns__get_domain_perm(adns_state ads, adns_query qu, int serv,
	204	const byte *dgram, int dglen,
	205	int cbyte_io, int max, int domainstart_r);
	206	adns_status adns__get_domain_temp(adns_state ads, adns_query qu, int serv,
	207	const byte *dgram, int dglen,
	208	int cbyte_io, int max, int domainstart_r);
	209	adns_status adns__get_rr_temp(adns_state ads, adns_query qu, int serv,
	210	const byte dgram, int dglen, int cbyte_io,
	211	int type_r, int class_r, int rdlen_r, int rdstart_r,
	212	const byte *eo_dgram, int eo_dglen, int eo_cbyte,
	213	int *eo_matched_r);
8402e34c	214
8402e34c	215	/* From event.c: */
4353a5c4	216
8402e34c	217	void adns__tcp_broken(adns_state ads, const char what, const char why);
4353a5c4	218	void adns__tcp_tryconnect(adns_state ads, struct timeval now);
4353a5c4	219	void adns__autosys(adns_state ads, struct timeval now);
37e28fde	220
	221	/* Useful static inline functions: */
	222
	223	static inline void timevaladd(struct timeval *tv_io, long ms) {
	224	struct timeval tmp;
	225	assert(ms>=0);
	226	tmp= *tv_io;
94436798	227	tmp.tv_usec += (ms%1000)*1000000;
37e28fde	228	tmp.tv_sec += ms/1000;
94436798	229	if (tmp.tv_usec >= 1000000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
37e28fde	230	*tv_io= tmp;
ddfda861	231	}
37e28fde	232
	233	static inline int ctype_whitespace(int c) { return c==' ' \|\| c=='\n' \|\| c=='\t'; }
	234	static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
98a3f706	235	static inline int ctype_alpha(int c) {
	236	return (c >= 'a' && c <= 'z') \|\| (c >= 'A' \|\| c <= 'Z');
	237	}
37e28fde	238
	239	/* Useful macros */
	240
4353a5c4	241	#define LIST_INIT(list) ((list).head= (list).tail= 0)
4353a5c4	242
37e28fde	243	#define LIST_UNLINK_PART(list,node,part) \
	244	do { \
	245	if ((node)->back) (node)->back->part next= (node)->part next; \
	246	else (list).head= (node)->part next; \
	247	if ((node)->next) (node)->next->part back= (node)->part back; \
	248	else (list).tail= (node)->part back; \
	249	} while(0)
	250
	251	#define LIST_LINK_TAIL_PART(list,node,part) \
	252	do { \
	253	(node)->part back= 0; \
	254	(node)->part next= (list).tail; \
	255	if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
	256	(list).tail= (node); \
	257	} while(0)
	258
	259	#define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
4353a5c4	260	#define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)
37e28fde	261
98a3f706	262	#define GETIL_B(cb) (dgram[(cb)++])
	263	#define GET_B(cb,tv) ((tv)= GETIL_B((cb)))
	264	#define GET_W(cb,tv) ((tv)=0, (tv)\|=(GETIL_B((cb))<<8), (tv)\|=GETIL_B(cb), (tv))
	265
37e28fde	266	#endif