/*      $NetBSD: lcl_pr.c,v 1.1.1.2 2012/09/09 16:07:54 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_pr.c,v 1.4 2006/03/09 23:57:56 marka Exp ";
#endif /* LIBC_SCCS and not lint */

/* extern */

#include "port_before.h"

#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>

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

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

#include "port_after.h"

#include "irs_p.h"
#include "lcl_p.h"

#ifndef _PATH_PROTOCOLS
#define _PATH_PROTOCOLS "/etc/protocols"
#endif
#define MAXALIASES      35

/* Types */

struct pvt {
       FILE *          fp;
       char            line[BUFSIZ+1];
       char *          dbuf;
       struct protoent proto;
       char *          proto_aliases[MAXALIASES];
};

/* Forward */

static void                     pr_close(struct irs_pr *);
static struct protoent *        pr_next(struct irs_pr *);
static struct protoent *        pr_byname(struct irs_pr *, const char *);
static struct protoent *        pr_bynumber(struct irs_pr *, int);
static void                     pr_rewind(struct irs_pr *);
static void                     pr_minimize(struct irs_pr *);

/* Portability. */

#ifndef SEEK_SET
# define SEEK_SET 0
#endif

/* Public */

struct irs_pr *
irs_lcl_pr(struct irs_acc *this) {
       struct irs_pr *pr;
       struct pvt *pvt;

       if (!(pr = memget(sizeof *pr))) {
               errno = ENOMEM;
               return (NULL);
       }
       if (!(pvt = memget(sizeof *pvt))) {
               memput(pr, sizeof *this);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       pr->private = pvt;
       pr->close = pr_close;
       pr->byname = pr_byname;
       pr->bynumber = pr_bynumber;
       pr->next = pr_next;
       pr->rewind = pr_rewind;
       pr->minimize = pr_minimize;
       pr->res_get = NULL;
       pr->res_set = NULL;
       return (pr);
}

/* Methods */

static void
pr_close(struct irs_pr *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (pvt->fp)
               (void) fclose(pvt->fp);
       if (pvt->dbuf)
               free(pvt->dbuf);
       memput(pvt, sizeof *pvt);
       memput(this, sizeof *this);
}

static struct protoent *
pr_byname(struct irs_pr *this, const char *name) {

       struct protoent *p;
       char **cp;

       pr_rewind(this);
       while ((p = pr_next(this))) {
               if (!strcmp(p->p_name, name))
                       goto found;
               for (cp = p->p_aliases; *cp; cp++)
                       if (!strcmp(*cp, name))
                               goto found;
       }
found:
       return (p);
}

static struct protoent *
pr_bynumber(struct irs_pr *this, int proto) {
       struct protoent *p;

       pr_rewind(this);
       while ((p = pr_next(this)))
               if (p->p_proto == proto)
                       break;
       return (p);
}

static void
pr_rewind(struct irs_pr *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_PROTOCOLS, "r" )))
               return;
       if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
               (void)fclose(pvt->fp);
               pvt->fp = NULL;
       }
}

static struct protoent *
pr_next(struct irs_pr *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       char *p, *cp, **q;
       char *bufp, *ndbuf, *dbuf = NULL;
       int c, bufsiz, offset;

       if (!pvt->fp)
               pr_rewind(this);
       if (!pvt->fp)
               return (NULL);
       if (pvt->dbuf) {
               free(pvt->dbuf);
               pvt->dbuf = NULL;
       }
       bufp = pvt->line;
       bufsiz = BUFSIZ;
       offset = 0;
again:
       if ((p = fgets(bufp + offset, bufsiz - offset, pvt->fp)) == NULL) {
               if (dbuf)
                       free(dbuf);
               return (NULL);
       }
       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->proto.p_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->proto.p_proto = atoi(cp);
       q = pvt->proto.p_aliases = pvt->proto_aliases;
       if (p != NULL) {
               cp = p;
               while (cp && *cp) {
                       if (*cp == ' ' || *cp == '\t') {
                               cp++;
                               continue;
                       }
                       if (q < &pvt->proto_aliases[MAXALIASES - 1])
                               *q++ = cp;
                       cp = strpbrk(cp, " \t");
                       if (cp != NULL)
                               *cp++ = '\0';
               }
       }
       *q = NULL;
       pvt->dbuf = dbuf;
       return (&pvt->proto);
}

static void
pr_minimize(struct irs_pr *this) {
       struct pvt *pvt = (struct pvt *)this->private;

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

/*! \file */

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