[adns] / src / internal.h

/**/

#ifndef ADNS_INTERNAL_H_INCLUDED
#define ADNS_INTERNAL_H_INCLUDED

#include <sys/time.h>

#include "adns.h"

/* Configuration and constants */

#define MAXSERVERS 5
#define MAXUDPRETRIES 15
#define UDPRETRYMS 2000
#define TCPMS 30000
#define LOCALRESOURCEMS 20
#define UDPMAXDGRAM 512
#define NSPORT 53

/* Shared data structures */

union adns__align {
  adns_status status;
  char *cp;
  adns_rrtype type;
  int int;
  struct in_addr ia;
  unsigned long ul;
};

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;
  adns_query 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;
  int nextudpserver;
  unsigned long sentudp, failedtcp; /* 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 */

  /* 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    +----------------+
   */
};

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 nservers, tcpserver;
  enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
  int tcpsocket;
  struct timeval tcptimeout;
  struct server {
    struct in_addr addr;
  } servers[MAXSERVERS];
};

/* 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);

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);
/* 1=>success, 0=>realloc failed */

/* From submit.c: */

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,
			  adns_rrtype type, adns_queryflags flags, int *qml_r);

/* From event.c: */
void adns__tcp_broken(adns_state ads, const char *what, const char *why);
void adns__tcp_tryconnect(adns_state ads);

/* 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)*1000;
  tmp.tv_sec += ms/1000;
  if (tmp.tv_usec >= 1000) { 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'; }

/* Useful macros */

#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_PART(list,node) LIST_LINK_TAIL(list,node,)

#endif
Commit	Line	Data
dfdbb32c	1	/**/
	2
	3	#ifndef ADNS_INTERNAL_H_INCLUDED
	4	#define ADNS_INTERNAL_H_INCLUDED
	5
	6	#include <sys/time.h>
	7
	8	#include "adns.h"
	9
	10	/* Configuration and constants */
	11
	12	#define MAXSERVERS 5
	13	#define MAXUDPRETRIES 15
	14	#define UDPRETRYMS 2000
	15	#define TCPMS 30000
	16	#define LOCALRESOURCEMS 20
	17	#define UDPMAXDGRAM 512
	18	#define NSPORT 53
	19
	20	/* Shared data structures */
	21
	22	union adns__align {
	23	adns_status status;
	24	char *cp;
	25	adns_rrtype type;
	26	int int;
	27	struct in_addr ia;
	28	unsigned long ul;
	29	};
	30
	31	struct adns__query {
	32	/* FIXME: make sure this is all init'd properly */
96e79df5	33	enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
dfdbb32c	34	adns_query back, next;
	35	adns_query parent;
	36	struct { adns_query head, tail; } children;
	37	struct { adns_query back, next; } siblings;
	38	adns_rrtype type;
	39	adns_answer *answer;
	40	size_t ansalloc; ansused;
96e79df5	41	int id, flags, udpretries;
	42	int nextudpserver;
	43	unsigned long sentudp, failedtcp; /* bitmap indexed by server */
dfdbb32c	44	struct timeval timeout;
	45	void *context;
	46	unsigned char *querymsg;
	47	int querylen;
	48	char owner[1];
96e79df5	49	/* After the owner name and nul comes the query message */
96e79df5	50
dfdbb32c	51	/* Possible states:
96e79df5	52	*
	53	* state Queue child id answer nextudpserver sentudp failedtcp
	54	*
	55	* udp NONE null >=0 null 0 zero zero
	56	* udp timew null >=0 null any nonzero zero
	57	* udp NONE null >=0 null any nonzero zero
	58	*
	59	* tcpwait timew null >=0 null irrelevant zero any
	60	* tcpsent timew null >=0 null irrelevant zero any
	61	*
	62	* child childw set >=0 partial irrelevant irrelevant irrelevant
	63	* done output null -1 set/null irrelevant irrelevant irrelevant
	64	*
	65	* +------------------------+
	66	* START -----> \| udp/NONE \|
	67	* +------------------------+
	68	* / \|\ \
	69	* too big for UDP / UDP timeout \ \ send via UDP
	70	* do this ASAP! / more retries \ \ do this ASAP!
	71	* \|_ desired \ _\|
	72	* +---------------+ +-----------+
	73	* \| tcpwait/timew \| ____ \| udp/timew \|
	74	* +---------------+ \ +-----------+
	75	* \| ^ \| \| \|
	76	* TCP conn'd; \| \| TCP died \| \| \|
	77	* send via TCP \| \| more \| UDP timeout \| \|
	78	* do this ASAP! \| \| servers \| no more \| \|
	79	* v \| to try \| retries \| \|
	80	* +---------------+ \| desired \| \|
	81	* \| tcpsent/timew \| ____ \| \| \|
	82	* +---------------+ \\| \| \|
	83	* \ \ TCP died \| TCP \| \|
	84	* \ \ no more \| timeout / \|
	85	* \ \ servers \| / \|
	86	* \ \ to try \| / \|
	87	* got \ \ v \|_ / got
	88	* reply \ _\| +------------------+ / reply
	89	* \ \| done/output FAIL \| /
	90	* \ +------------------+ /
	91	* \ /
	92	* _\| \|_
	93	* (..... got reply ....)
	94	* / \
	95	* need child query/ies / \ no child query
	96	* / \
	97	* \|_ _\|
	98	* +--------------+ +----------------+
	99	* \| child/childw \| ----------------> \| done/output OK \|
	100	* +--------------+ children done +----------------+
dfdbb32c	101	*/
	102	};
	103
96e79df5	104	typedef struct {
dfdbb32c	105	size_t used, avail;
dfdbb32c	106	unsigned char *buf;
96e79df5	107	} adns__vbuf;
dfdbb32c	108
	109	struct adns__state {
	110	/* FIXME: make sure this is all init'd properly */
	111	adns_initflags iflags;
	112	FILE *diagfile;
96e79df5	113	struct { adns_query head, tail; } timew, childw, output;
dfdbb32c	114	int nextid, udpsocket;
	115	adns_vbuf rqbuf, tcpsend, tcprecv;
	116	int nservers, tcpserver;
71324651	117	enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
dfdbb32c	118	int tcpsocket;
	119	struct timeval tcptimeout;
	120	struct server {
	121	struct in_addr addr;
	122	} servers[MAXSERVERS];
	123	};
	124
	125	/* From setup.c: */
	126
	127	void adns__vdiag(adns_state ads, adns_initflags prevent, const char *pfx,
	128	int serv, const char *fmt, va_list al);
71324651	129	void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
	130	void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
	131	void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
dfdbb32c	132
96e79df5	133	static inline int adns__vbuf_ensure(adns__vbuf *vb, size_t want);
	134	int adns__vbuf_append(adns__vbuf vb, const byte data, size_t len);
	135	int adns__vbuf_appendq(adns__vbuf vb, const byte data, size_t len);
	136	/* 1=>success, 0=>realloc failed */
	137
dfdbb32c	138	/* From submit.c: */
	139
	140	void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
	141
	142	/* From query.c: */
	143
96e79df5	144	void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
96e79df5	145	void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
48cb0b4b	146	adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
48cb0b4b	147	adns_rrtype type, adns_queryflags flags, int *qml_r);
71324651	148
	149	/* From event.c: */
	150	void adns__tcp_broken(adns_state ads, const char what, const char why);
	151	void adns__tcp_tryconnect(adns_state ads);
dfdbb32c	152
	153	/* Useful static inline functions: */
	154
	155	static inline void timevaladd(struct timeval *tv_io, long ms) {
	156	struct timeval tmp;
	157	assert(ms>=0);
	158	tmp= *tv_io;
	159	tmp.tv_usec += (ms%1000)*1000;
	160	tmp.tv_sec += ms/1000;
	161	if (tmp.tv_usec >= 1000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
	162	*tv_io= tmp;
96e79df5	163	}
dfdbb32c	164
	165	static inline int ctype_whitespace(int c) { return c==' ' \|\| c=='\n' \|\| c=='\t'; }
	166	static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
	167
	168	/* Useful macros */
	169
	170	#define LIST_UNLINK_PART(list,node,part) \
	171	do { \
	172	if ((node)->back) (node)->back->part next= (node)->part next; \
	173	else (list).head= (node)->part next; \
	174	if ((node)->next) (node)->next->part back= (node)->part back; \
	175	else (list).tail= (node)->part back; \
	176	} while(0)
	177
	178	#define LIST_LINK_TAIL_PART(list,node,part) \
	179	do { \
	180	(node)->part back= 0; \
	181	(node)->part next= (list).tail; \
	182	if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
	183	(list).tail= (node); \
	184	} while(0)
	185
	186	#define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
	187	#define LIST_LINK_TAIL_PART(list,node) LIST_LINK_TAIL(list,node,)
	188
	189	#endif