[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"

typedef enum {
  rtf_deref=     0x1, /* dereference domains and perhaps produce extra data */
  rtf_mail822=   0x2, /* make mailboxes be in RFC822 rcpt field format */
} rrtype_flags;

struct adns__rrtype {
  int qtype;
  rrtype_flags rflags;
  void (*recv_fn)(void);
};

/* Configuration and constants */

#define MAXSERVERS 5
#define MAXUDPRETRIES /*15*/5
#define UDPRETRYMS 2000
#define TCPMS 30000
#define LOCALRESOURCEMS 20
#define MAXUDPDGRAM 512
#define NSPORT 53
#define MAXDNAME 255

/* 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;

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;
  adns_rrtype type;
  vbuf answer;
  int id, flags, udpretries;
  int udpnextserver;
  unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
  struct timeval timeout;
  byte *querymsg;
  int querylen;
  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);
/* 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_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);

/* From reply.c: */

void adns__procdgram(adns_state ads, const byte *dgram, int len, int serv);

/* 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'; }

/* 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,)

#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
1c94793e	17	typedef enum {
	18	rtf_deref= 0x1, /* dereference domains and perhaps produce extra data */
	19	rtf_mail822= 0x2, /* make mailboxes be in RFC822 rcpt field format */
	20	} rrtype_flags;
	21
	22	struct adns__rrtype {
	23	int qtype;
	24	rrtype_flags rflags;
	25	void (*recv_fn)(void);
	26	};
	27
37e28fde	28	/* Configuration and constants */
	29
	30	#define MAXSERVERS 5
94436798	31	#define MAXUDPRETRIES /15/5
37e28fde	32	#define UDPRETRYMS 2000
	33	#define TCPMS 30000
	34	#define LOCALRESOURCEMS 20
4353a5c4	35	#define MAXUDPDGRAM 512
37e28fde	36	#define NSPORT 53
4353a5c4	37	#define MAXDNAME 255
37e28fde	38
	39	/* Shared data structures */
	40
4353a5c4	41	typedef union {
37e28fde	42	adns_status status;
	43	char *cp;
	44	adns_rrtype type;
4353a5c4	45	int i;
37e28fde	46	struct in_addr ia;
37e28fde	47	unsigned long ul;
4353a5c4	48	} rr_align;
	49
	50	typedef struct {
	51	int used, avail;
	52	byte *buf;
	53	} vbuf;
	54
	55	typedef union {
	56	void *ext;
	57	int dmaddr_index;
	58	} qcontext;
37e28fde	59
	60	struct adns__query {
	61	/* FIXME: make sure this is all init'd properly */
ddfda861	62	enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
4353a5c4	63	adns_query back, next, parent;
37e28fde	64	struct { adns_query head, tail; } children;
	65	struct { adns_query back, next; } siblings;
	66	adns_rrtype type;
4353a5c4	67	vbuf answer;
ddfda861	68	int id, flags, udpretries;
4353a5c4	69	int udpnextserver;
4353a5c4	70	unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
37e28fde	71	struct timeval timeout;
4353a5c4	72	byte *querymsg;
37e28fde	73	int querylen;
4353a5c4	74	qcontext context;
37e28fde	75	char owner[1];
4353a5c4	76	/* After the owner name and nul comes the query message, pointed to by querymsg */
ddfda861	77
37e28fde	78	/* Possible states:
ddfda861	79	*
	80	* state Queue child id answer nextudpserver sentudp failedtcp
	81	*
	82	* udp NONE null >=0 null 0 zero zero
	83	* udp timew null >=0 null any nonzero zero
	84	* udp NONE null >=0 null any nonzero zero
	85	*
	86	* tcpwait timew null >=0 null irrelevant zero any
	87	* tcpsent timew null >=0 null irrelevant zero any
	88	*
	89	* child childw set >=0 partial irrelevant irrelevant irrelevant
	90	* done output null -1 set/null irrelevant irrelevant irrelevant
	91	*
	92	* +------------------------+
	93	* START -----> \| udp/NONE \|
	94	* +------------------------+
	95	* / \|\ \
	96	* too big for UDP / UDP timeout \ \ send via UDP
	97	* do this ASAP! / more retries \ \ do this ASAP!
	98	* \|_ desired \ _\|
	99	* +---------------+ +-----------+
	100	* \| tcpwait/timew \| ____ \| udp/timew \|
	101	* +---------------+ \ +-----------+
	102	* \| ^ \| \| \|
	103	* TCP conn'd; \| \| TCP died \| \| \|
	104	* send via TCP \| \| more \| UDP timeout \| \|
	105	* do this ASAP! \| \| servers \| no more \| \|
	106	* v \| to try \| retries \| \|
	107	* +---------------+ \| desired \| \|
	108	* \| tcpsent/timew \| ____ \| \| \|
	109	* +---------------+ \\| \| \|
	110	* \ \ TCP died \| TCP \| \|
	111	* \ \ no more \| timeout / \|
	112	* \ \ servers \| / \|
	113	* \ \ to try \| / \|
	114	* got \ \ v \|_ / got
	115	* reply \ _\| +------------------+ / reply
	116	* \ \| done/output FAIL \| /
	117	* \ +------------------+ /
	118	* \ /
	119	* _\| \|_
	120	* (..... got reply ....)
	121	* / \
	122	* need child query/ies / \ no child query
	123	* / \
	124	* \|_ _\|
	125	* +--------------+ +----------------+
	126	* \| child/childw \| ----------------> \| done/output OK \|
	127	* +--------------+ children done +----------------+
37e28fde	128	*/
	129	};
	130
37e28fde	131	struct adns__state {
37e28fde	132	adns_initflags iflags;
37e28fde	133	FILE *diagfile;
ddfda861	134	struct { adns_query head, tail; } timew, childw, output;
4353a5c4	135	int nextid, udpsocket, tcpsocket;
4353a5c4	136	vbuf rqbuf, tcpsend, tcprecv;
37e28fde	137	int nservers, tcpserver;
8402e34c	138	enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
37e28fde	139	struct timeval tcptimeout;
	140	struct server {
	141	struct in_addr addr;
	142	} servers[MAXSERVERS];
	143	};
	144
	145	/* From setup.c: */
	146
4353a5c4	147	void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
37e28fde	148	int serv, const char *fmt, va_list al);
8402e34c	149	void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
	150	void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
	151	void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
37e28fde	152
4353a5c4	153	int adns__vbuf_ensure(vbuf *vb, int want);
4353a5c4	154	int adns__vbuf_append(vbuf vb, const byte data, int len);
ddfda861	155	/* 1=>success, 0=>realloc failed */
4353a5c4	156	void adns__vbuf_appendq(vbuf vb, const byte data, int len);
	157	void adns__vbuf_init(vbuf *vb);
	158
	159	int adns__setnonblock(adns_state ads, int fd); /* => errno value */
ddfda861	160
37e28fde	161	/* From submit.c: */
37e28fde	162
4353a5c4	163	void adns__query_nomem(adns_state ads, adns_query qu);
37e28fde	164	void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
	165
	166	/* From query.c: */
	167
ddfda861	168	void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
ddfda861	169	void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
4bec51a4	170	adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
4353a5c4	171	adns_rrtype type, adns_queryflags flags);
	172
	173	/* From reply.c: */
	174
	175	void adns__procdgram(adns_state ads, const byte *dgram, int len, int serv);
8402e34c	176
8402e34c	177	/* From event.c: */
4353a5c4	178
8402e34c	179	void adns__tcp_broken(adns_state ads, const char what, const char why);
4353a5c4	180	void adns__tcp_tryconnect(adns_state ads, struct timeval now);
4353a5c4	181	void adns__autosys(adns_state ads, struct timeval now);
37e28fde	182
	183	/* Useful static inline functions: */
	184
	185	static inline void timevaladd(struct timeval *tv_io, long ms) {
	186	struct timeval tmp;
	187	assert(ms>=0);
	188	tmp= *tv_io;
94436798	189	tmp.tv_usec += (ms%1000)*1000000;
37e28fde	190	tmp.tv_sec += ms/1000;
94436798	191	if (tmp.tv_usec >= 1000000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
37e28fde	192	*tv_io= tmp;
ddfda861	193	}
37e28fde	194
	195	static inline int ctype_whitespace(int c) { return c==' ' \|\| c=='\n' \|\| c=='\t'; }
	196	static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
	197
	198	/* Useful macros */
	199
4353a5c4	200	#define LIST_INIT(list) ((list).head= (list).tail= 0)
4353a5c4	201
37e28fde	202	#define LIST_UNLINK_PART(list,node,part) \
	203	do { \
	204	if ((node)->back) (node)->back->part next= (node)->part next; \
	205	else (list).head= (node)->part next; \
	206	if ((node)->next) (node)->next->part back= (node)->part back; \
	207	else (list).tail= (node)->part back; \
	208	} while(0)
	209
	210	#define LIST_LINK_TAIL_PART(list,node,part) \
	211	do { \
	212	(node)->part back= 0; \
	213	(node)->part next= (list).tail; \
	214	if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
	215	(list).tail= (node); \
	216	} while(0)
	217
	218	#define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
4353a5c4	219	#define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)
37e28fde	220
37e28fde	221	#endif