/*      $NetBSD: lcl_nw.c,v 1.1.1.2 2012/09/09 16:07:59 christos Exp $  */

/*
* Copyright (c) 1989, 1993, 1995
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: lcl_nw.c,v 1.4 2005/04/27 04:56:31 sra Exp ";
/* from getgrent.c 8.2 (Berkeley) 3/21/94"; */
/* from BSDI Id: getgrent.c,v 2.8 1996/05/28 18:15:14 bostic Exp $      */
#endif /* LIBC_SCCS and not lint */

/* Imports */

#include "port_before.h"

#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>

#include <errno.h>
#include <fcntl.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <irs.h>
#include <isc/memcluster.h>

#include "port_after.h"

#include <isc/misc.h>
#include "irs_p.h"
#include "lcl_p.h"

#define MAXALIASES 35
#define MAXADDRSIZE 4

struct pvt {
       FILE *          fp;
       char            line[BUFSIZ+1];
       struct nwent    net;
       char *          aliases[MAXALIASES];
       char            addr[MAXADDRSIZE];
       struct __res_state *  res;
       void            (*free_res)(void *);
};

/* Forward */

static void             nw_close(struct irs_nw *);
static struct nwent *   nw_byname(struct irs_nw *, const char *, int);
static struct nwent *   nw_byaddr(struct irs_nw *, void *, int, int);
static struct nwent *   nw_next(struct irs_nw *);
static void             nw_rewind(struct irs_nw *);
static void             nw_minimize(struct irs_nw *);
static struct __res_state * nw_res_get(struct irs_nw *this);
static void             nw_res_set(struct irs_nw *this,
                                  struct __res_state *res,
                                  void (*free_res)(void *));

static int              init(struct irs_nw *this);

/* Portability. */

#ifndef SEEK_SET
# define SEEK_SET 0
#endif

/* Public */

struct irs_nw *
irs_lcl_nw(struct irs_acc *this) {
       struct irs_nw *nw;
       struct pvt *pvt;

       UNUSED(this);

       if (!(pvt = memget(sizeof *pvt))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       if (!(nw = memget(sizeof *nw))) {
               memput(pvt, sizeof *pvt);
               errno = ENOMEM;
               return (NULL);
       }
       memset(nw, 0x5e, sizeof *nw);
       nw->private = pvt;
       nw->close = nw_close;
       nw->byname = nw_byname;
       nw->byaddr = nw_byaddr;
       nw->next = nw_next;
       nw->rewind = nw_rewind;
       nw->minimize = nw_minimize;
       nw->res_get = nw_res_get;
       nw->res_set = nw_res_set;
       return (nw);
}

/* Methods */

static void
nw_close(struct irs_nw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       nw_minimize(this);
       if (pvt->res && pvt->free_res)
               (*pvt->free_res)(pvt->res);
       if (pvt->fp)
               (void)fclose(pvt->fp);
       memput(pvt, sizeof *pvt);
       memput(this, sizeof *this);
}

static struct nwent *
nw_byaddr(struct irs_nw *this, void *net, int length, int type) {
       struct nwent *p;

       if (init(this) == -1)
               return(NULL);

       nw_rewind(this);
       while ((p = nw_next(this)) != NULL)
               if (p->n_addrtype == type && p->n_length == length)
                       if (bitncmp(p->n_addr, net, length) == 0)
                               break;
       return (p);
}

static struct nwent *
nw_byname(struct irs_nw *this, const char *name, int type) {
       struct nwent *p;
       char **ap;

       if (init(this) == -1)
               return(NULL);

       nw_rewind(this);
       while ((p = nw_next(this)) != NULL) {
               if (ns_samename(p->n_name, name) == 1 &&
                   p->n_addrtype == type)
                       break;
               for (ap = p->n_aliases; *ap; ap++)
                       if ((ns_samename(*ap, name) == 1) &&
                           (p->n_addrtype == type))
                               goto found;
       }
found:
       return (p);
}

static void
nw_rewind(struct irs_nw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (pvt->fp) {
               if (fseek(pvt->fp, 0L, SEEK_SET) == 0)
                       return;
               (void)fclose(pvt->fp);
       }
       if (!(pvt->fp = fopen(_PATH_NETWORKS, "r")))
               return;
       if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
               (void)fclose(pvt->fp);
               pvt->fp = NULL;
       }
}

static struct nwent *
nw_next(struct irs_nw *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct nwent *ret = NULL;
       char *p, *cp, **q;
       char *bufp, *ndbuf, *dbuf = NULL;
       int c, bufsiz, offset = 0;

       if (init(this) == -1)
               return(NULL);

       if (pvt->fp == NULL)
               nw_rewind(this);
       if (pvt->fp == NULL) {
               RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
               return (NULL);
       }
       bufp = pvt->line;
       bufsiz = sizeof(pvt->line);

again:
       p = fgets(bufp + offset, bufsiz - offset, pvt->fp);
       if (p == NULL)
               goto cleanup;
       if (!strchr(p, '\n') && !feof(pvt->fp)) {
#define GROWBUF 1024
               /* allocate space for longer line */
               if (dbuf == NULL) {
                       if ((ndbuf = malloc(bufsiz + GROWBUF)) != NULL)
                               strcpy(ndbuf, bufp);
               } else
                       ndbuf = realloc(dbuf, bufsiz + GROWBUF);
               if (ndbuf) {
                       dbuf = ndbuf;
                       bufp = dbuf;
                       bufsiz += GROWBUF;
                       offset = strlen(dbuf);
               } else {
                       /* allocation failed; skip this long line */
                       while ((c = getc(pvt->fp)) != EOF)
                               if (c == '\n')
                                       break;
                       if (c != EOF)
                               ungetc(c, pvt->fp);
               }
               goto again;
       }

       p -= offset;
       offset = 0;

       if (*p == '#')
               goto again;

       cp = strpbrk(p, "#\n");
       if (cp != NULL)
               *cp = '\0';
       pvt->net.n_name = p;
       cp = strpbrk(p, " \t");
       if (cp == NULL)
               goto again;
       *cp++ = '\0';
       while (*cp == ' ' || *cp == '\t')
               cp++;
       p = strpbrk(cp, " \t");
       if (p != NULL)
               *p++ = '\0';
       pvt->net.n_length = inet_net_pton(AF_INET, cp, pvt->addr,
                                         sizeof pvt->addr);
       if (pvt->net.n_length < 0)
               goto again;
       pvt->net.n_addrtype = AF_INET;
       pvt->net.n_addr = pvt->addr;
       q = pvt->net.n_aliases = pvt->aliases;
       if (p != NULL) {
               cp = p;
               while (cp && *cp) {
                       if (*cp == ' ' || *cp == '\t') {
                               cp++;
                               continue;
                       }
                       if (q < &pvt->aliases[MAXALIASES - 1])
                               *q++ = cp;
                       cp = strpbrk(cp, " \t");
                       if (cp != NULL)
                               *cp++ = '\0';
               }
       }
       *q = NULL;
       ret = &pvt->net;

cleanup:
       if (dbuf)
               free(dbuf);

       return (ret);
}

static void
nw_minimize(struct irs_nw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (pvt->res)
               res_nclose(pvt->res);
       if (pvt->fp != NULL) {
               (void)fclose(pvt->fp);
               pvt->fp = NULL;
       }
}

static struct __res_state *
nw_res_get(struct irs_nw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (!pvt->res) {
               struct __res_state *res;
               res = (struct __res_state *)malloc(sizeof *res);
               if (!res) {
                       errno = ENOMEM;
                       return (NULL);
               }
               memset(res, 0, sizeof *res);
               nw_res_set(this, res, free);
       }

       return (pvt->res);
}

static void
nw_res_set(struct irs_nw *this, struct __res_state *res,
               void (*free_res)(void *)) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (pvt->res && pvt->free_res) {
               res_nclose(pvt->res);
               (*pvt->free_res)(pvt->res);
       }

       pvt->res = res;
       pvt->free_res = free_res;
}

static int
init(struct irs_nw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (!pvt->res && !nw_res_get(this))
               return (-1);
       if (((pvt->res->options & RES_INIT) == 0U) &&
           res_ninit(pvt->res) == -1)
               return (-1);
       return (0);
}

/*! \file */

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