xref: /onnv-gate/usr/src/lib/libresolv2/common/irs/gen_sv.c (revision 11038:74b12212b8a2)
10Sstevel@tonic-gate /*
2*11038SRao.Shoaib@Sun.COM  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
30Sstevel@tonic-gate  * Copyright (c) 1996,1999 by Internet Software Consortium.
40Sstevel@tonic-gate  *
50Sstevel@tonic-gate  * Permission to use, copy, modify, and distribute this software for any
60Sstevel@tonic-gate  * purpose with or without fee is hereby granted, provided that the above
70Sstevel@tonic-gate  * copyright notice and this permission notice appear in all copies.
80Sstevel@tonic-gate  *
9*11038SRao.Shoaib@Sun.COM  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10*11038SRao.Shoaib@Sun.COM  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11*11038SRao.Shoaib@Sun.COM  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
12*11038SRao.Shoaib@Sun.COM  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13*11038SRao.Shoaib@Sun.COM  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14*11038SRao.Shoaib@Sun.COM  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15*11038SRao.Shoaib@Sun.COM  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
160Sstevel@tonic-gate  */
170Sstevel@tonic-gate 
180Sstevel@tonic-gate #if !defined(LINT) && !defined(CODECENTER)
19*11038SRao.Shoaib@Sun.COM static const char rcsid[] = "$Id: gen_sv.c,v 1.3 2005/04/27 04:56:24 sra Exp $";
200Sstevel@tonic-gate #endif
210Sstevel@tonic-gate 
220Sstevel@tonic-gate /* Imports */
230Sstevel@tonic-gate 
240Sstevel@tonic-gate #include "port_before.h"
250Sstevel@tonic-gate 
260Sstevel@tonic-gate #include <sys/types.h>
270Sstevel@tonic-gate #include <netinet/in.h>
280Sstevel@tonic-gate #include <arpa/nameser.h>
290Sstevel@tonic-gate #include <resolv.h>
300Sstevel@tonic-gate 
310Sstevel@tonic-gate #include <errno.h>
320Sstevel@tonic-gate #include <stdlib.h>
330Sstevel@tonic-gate #include <string.h>
340Sstevel@tonic-gate 
350Sstevel@tonic-gate #include <isc/memcluster.h>
360Sstevel@tonic-gate #include <irs.h>
370Sstevel@tonic-gate 
380Sstevel@tonic-gate #include "port_after.h"
390Sstevel@tonic-gate 
400Sstevel@tonic-gate #include "irs_p.h"
410Sstevel@tonic-gate #include "gen_p.h"
420Sstevel@tonic-gate 
430Sstevel@tonic-gate /* Types */
440Sstevel@tonic-gate 
450Sstevel@tonic-gate struct pvt {
460Sstevel@tonic-gate 	struct irs_rule *	rules;
470Sstevel@tonic-gate 	struct irs_rule *	rule;
480Sstevel@tonic-gate 	struct __res_state *	res;
490Sstevel@tonic-gate 	void			(*free_res)(void *);
500Sstevel@tonic-gate };
510Sstevel@tonic-gate 
520Sstevel@tonic-gate /* Forward */
530Sstevel@tonic-gate 
540Sstevel@tonic-gate static void			sv_close(struct irs_sv*);
550Sstevel@tonic-gate static struct servent *		sv_next(struct irs_sv *);
560Sstevel@tonic-gate static struct servent *		sv_byname(struct irs_sv *, const char *,
570Sstevel@tonic-gate 					  const char *);
580Sstevel@tonic-gate static struct servent *		sv_byport(struct irs_sv *, int, const char *);
590Sstevel@tonic-gate static void			sv_rewind(struct irs_sv *);
600Sstevel@tonic-gate static void			sv_minimize(struct irs_sv *);
610Sstevel@tonic-gate static struct __res_state *	sv_res_get(struct irs_sv *);
620Sstevel@tonic-gate static void			sv_res_set(struct irs_sv *,
630Sstevel@tonic-gate 					      struct __res_state *,
640Sstevel@tonic-gate 					      void (*)(void *));
650Sstevel@tonic-gate 
660Sstevel@tonic-gate /* Public */
670Sstevel@tonic-gate 
680Sstevel@tonic-gate struct irs_sv *
irs_gen_sv(struct irs_acc * this)690Sstevel@tonic-gate irs_gen_sv(struct irs_acc *this) {
700Sstevel@tonic-gate 	struct gen_p *accpvt = (struct gen_p *)this->private;
710Sstevel@tonic-gate 	struct irs_sv *sv;
720Sstevel@tonic-gate 	struct pvt *pvt;
730Sstevel@tonic-gate 
740Sstevel@tonic-gate 	if (!(sv = memget(sizeof *sv))) {
750Sstevel@tonic-gate 		errno = ENOMEM;
760Sstevel@tonic-gate 		return (NULL);
770Sstevel@tonic-gate 	}
780Sstevel@tonic-gate 	memset(sv, 0x5e, sizeof *sv);
790Sstevel@tonic-gate 	if (!(pvt = memget(sizeof *pvt))) {
800Sstevel@tonic-gate 		memput(sv, sizeof *sv);
810Sstevel@tonic-gate 		errno = ENOMEM;
820Sstevel@tonic-gate 		return (NULL);
830Sstevel@tonic-gate 	}
840Sstevel@tonic-gate 	memset(pvt, 0, sizeof *pvt);
850Sstevel@tonic-gate 	pvt->rules = accpvt->map_rules[irs_sv];
860Sstevel@tonic-gate 	pvt->rule = pvt->rules;
870Sstevel@tonic-gate 	sv->private = pvt;
880Sstevel@tonic-gate 	sv->close = sv_close;
890Sstevel@tonic-gate 	sv->next = sv_next;
900Sstevel@tonic-gate 	sv->byname = sv_byname;
910Sstevel@tonic-gate 	sv->byport = sv_byport;
920Sstevel@tonic-gate 	sv->rewind = sv_rewind;
930Sstevel@tonic-gate 	sv->minimize = sv_minimize;
940Sstevel@tonic-gate 	sv->res_get = sv_res_get;
950Sstevel@tonic-gate 	sv->res_set = sv_res_set;
960Sstevel@tonic-gate 	return (sv);
970Sstevel@tonic-gate }
980Sstevel@tonic-gate 
990Sstevel@tonic-gate /* Methods */
1000Sstevel@tonic-gate 
1010Sstevel@tonic-gate static void
sv_close(struct irs_sv * this)1020Sstevel@tonic-gate sv_close(struct irs_sv *this) {
1030Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
1040Sstevel@tonic-gate 
1050Sstevel@tonic-gate 	memput(pvt, sizeof *pvt);
1060Sstevel@tonic-gate 	memput(this, sizeof *this);
1070Sstevel@tonic-gate }
1080Sstevel@tonic-gate 
1090Sstevel@tonic-gate static struct servent *
sv_next(struct irs_sv * this)1100Sstevel@tonic-gate sv_next(struct irs_sv *this) {
1110Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
1120Sstevel@tonic-gate 	struct servent *rval;
1130Sstevel@tonic-gate 	struct irs_sv *sv;
1140Sstevel@tonic-gate 
1150Sstevel@tonic-gate 	while (pvt->rule) {
1160Sstevel@tonic-gate 		sv = pvt->rule->inst->sv;
1170Sstevel@tonic-gate 		rval = (*sv->next)(sv);
1180Sstevel@tonic-gate 		if (rval)
1190Sstevel@tonic-gate 			return (rval);
1200Sstevel@tonic-gate 		if (!(pvt->rule->flags & IRS_CONTINUE))
1210Sstevel@tonic-gate 			break;
1220Sstevel@tonic-gate 		pvt->rule = pvt->rule->next;
1230Sstevel@tonic-gate 		if (pvt->rule) {
1240Sstevel@tonic-gate 			sv = pvt->rule->inst->sv;
1250Sstevel@tonic-gate 			(*sv->rewind)(sv);
1260Sstevel@tonic-gate 		}
1270Sstevel@tonic-gate 	}
1280Sstevel@tonic-gate 	return (NULL);
1290Sstevel@tonic-gate }
1300Sstevel@tonic-gate 
1310Sstevel@tonic-gate static struct servent *
sv_byname(struct irs_sv * this,const char * name,const char * proto)1320Sstevel@tonic-gate sv_byname(struct irs_sv *this, const char *name, const char *proto) {
1330Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
1340Sstevel@tonic-gate 	struct irs_rule *rule;
1350Sstevel@tonic-gate 	struct servent *rval;
1360Sstevel@tonic-gate 	struct irs_sv *sv;
1370Sstevel@tonic-gate 
1380Sstevel@tonic-gate 	rval = NULL;
1390Sstevel@tonic-gate 	for (rule = pvt->rules; rule; rule = rule->next) {
1400Sstevel@tonic-gate 		sv = rule->inst->sv;
1410Sstevel@tonic-gate 		rval = (*sv->byname)(sv, name, proto);
1420Sstevel@tonic-gate 		if (rval || !(rule->flags & IRS_CONTINUE))
1430Sstevel@tonic-gate 			break;
1440Sstevel@tonic-gate 	}
1450Sstevel@tonic-gate 	return (rval);
1460Sstevel@tonic-gate }
1470Sstevel@tonic-gate 
1480Sstevel@tonic-gate static struct servent *
sv_byport(struct irs_sv * this,int port,const char * proto)1490Sstevel@tonic-gate sv_byport(struct irs_sv *this, int port, const char *proto) {
1500Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
1510Sstevel@tonic-gate 	struct irs_rule *rule;
1520Sstevel@tonic-gate 	struct servent *rval;
1530Sstevel@tonic-gate 	struct irs_sv *sv;
1540Sstevel@tonic-gate 
1550Sstevel@tonic-gate 	rval = NULL;
1560Sstevel@tonic-gate 	for (rule = pvt->rules; rule; rule = rule->next) {
1570Sstevel@tonic-gate 		sv = rule->inst->sv;
1580Sstevel@tonic-gate 		rval = (*sv->byport)(sv, port, proto);
1590Sstevel@tonic-gate 		if (rval || !(rule->flags & IRS_CONTINUE))
1600Sstevel@tonic-gate 			break;
1610Sstevel@tonic-gate 	}
1620Sstevel@tonic-gate 	return (rval);
1630Sstevel@tonic-gate }
1640Sstevel@tonic-gate 
1650Sstevel@tonic-gate static void
sv_rewind(struct irs_sv * this)1660Sstevel@tonic-gate sv_rewind(struct irs_sv *this) {
1670Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
1680Sstevel@tonic-gate 	struct irs_sv *sv;
1690Sstevel@tonic-gate 
1700Sstevel@tonic-gate 	pvt->rule = pvt->rules;
1710Sstevel@tonic-gate 	if (pvt->rule) {
1720Sstevel@tonic-gate 		sv = pvt->rule->inst->sv;
1730Sstevel@tonic-gate 		(*sv->rewind)(sv);
1740Sstevel@tonic-gate 	}
1750Sstevel@tonic-gate }
1760Sstevel@tonic-gate 
1770Sstevel@tonic-gate static void
sv_minimize(struct irs_sv * this)1780Sstevel@tonic-gate sv_minimize(struct irs_sv *this) {
1790Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
1800Sstevel@tonic-gate 	struct irs_rule *rule;
1810Sstevel@tonic-gate 
1820Sstevel@tonic-gate 	for (rule = pvt->rules; rule != NULL; rule = rule->next) {
1830Sstevel@tonic-gate 		struct irs_sv *sv = rule->inst->sv;
1840Sstevel@tonic-gate 
1850Sstevel@tonic-gate 		(*sv->minimize)(sv);
1860Sstevel@tonic-gate 	}
1870Sstevel@tonic-gate }
1880Sstevel@tonic-gate 
1890Sstevel@tonic-gate static struct __res_state *
sv_res_get(struct irs_sv * this)1900Sstevel@tonic-gate sv_res_get(struct irs_sv *this) {
1910Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
1920Sstevel@tonic-gate 
1930Sstevel@tonic-gate 	if (!pvt->res) {
1940Sstevel@tonic-gate 		struct __res_state *res;
1950Sstevel@tonic-gate 		res = (struct __res_state *)malloc(sizeof *res);
1960Sstevel@tonic-gate 		if (!res) {
1970Sstevel@tonic-gate 			errno = ENOMEM;
1980Sstevel@tonic-gate 			return (NULL);
1990Sstevel@tonic-gate 		}
2000Sstevel@tonic-gate 		memset(res, 0, sizeof *res);
2010Sstevel@tonic-gate 		sv_res_set(this, res, free);
2020Sstevel@tonic-gate 	}
2030Sstevel@tonic-gate 
2040Sstevel@tonic-gate 	return (pvt->res);
2050Sstevel@tonic-gate }
2060Sstevel@tonic-gate 
2070Sstevel@tonic-gate static void
sv_res_set(struct irs_sv * this,struct __res_state * res,void (* free_res)(void *))2080Sstevel@tonic-gate sv_res_set(struct irs_sv *this, struct __res_state *res,
2090Sstevel@tonic-gate 		void (*free_res)(void *)) {
2100Sstevel@tonic-gate 	struct pvt *pvt = (struct pvt *)this->private;
2110Sstevel@tonic-gate 	struct irs_rule *rule;
2120Sstevel@tonic-gate 
2130Sstevel@tonic-gate 	if (pvt->res && pvt->free_res) {
2140Sstevel@tonic-gate 		res_nclose(pvt->res);
2150Sstevel@tonic-gate 		(*pvt->free_res)(pvt->res);
2160Sstevel@tonic-gate 	}
2170Sstevel@tonic-gate 
2180Sstevel@tonic-gate 	pvt->res = res;
2190Sstevel@tonic-gate 	pvt->free_res = free_res;
2200Sstevel@tonic-gate 
2210Sstevel@tonic-gate 	for (rule = pvt->rules; rule != NULL; rule = rule->next) {
2220Sstevel@tonic-gate 		struct irs_sv *sv = rule->inst->sv;
2230Sstevel@tonic-gate 
2240Sstevel@tonic-gate 		if (sv->res_set)
2250Sstevel@tonic-gate 			(*sv->res_set)(sv, pvt->res, NULL);
2260Sstevel@tonic-gate 	}
2270Sstevel@tonic-gate }
228*11038SRao.Shoaib@Sun.COM 
229*11038SRao.Shoaib@Sun.COM /*! \file */
230