/*      $NetBSD: getrpcent.c,v 1.24 2021/04/13 00:29:22 mrg Exp $       */

/*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * 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.
*     * Neither the name of the "Oracle America, Inc." 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 COPYRIGHT HOLDERS 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
*   COPYRIGHT HOLDER 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.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char *sccsid = "@(#)getrpcent.c 1.14 91/03/11 Copyr 1984 Sun Micro";
#else
__RCSID("$NetBSD: getrpcent.c,v 1.24 2021/04/13 00:29:22 mrg Exp $");
#endif
#endif

/*
* Copyright (c) 1984 by Sun Microsystems, Inc.
*/

#include "namespace.h"

#include <sys/types.h>

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

#include <assert.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <rpc/rpc.h>

#ifdef __weak_alias
__weak_alias(endrpcent,_endrpcent)
__weak_alias(getrpcbyname,_getrpcbyname)
__weak_alias(getrpcbynumber,_getrpcbynumber)
__weak_alias(getrpcent,_getrpcent)
__weak_alias(setrpcent,_setrpcent)
#endif

/*
* Internet version.
*/
static struct rpcdata {
       FILE    *rpcf;
       int     stayopen;
#define MAXALIASES      35
       char    *rpc_aliases[MAXALIASES];
       struct  rpcent rpc;
       char    line[BUFSIZ+1];
} *rpcdata;

static  struct rpcent *interpret(char *val, size_t len);

#define RPCDB   "/etc/rpc"

static struct rpcdata *_rpcdata(void);

static struct rpcdata *
_rpcdata(void)
{
       struct rpcdata *d = rpcdata;

       if (d == 0) {
               d = (struct rpcdata *)calloc(1, sizeof (struct rpcdata));
               rpcdata = d;
       }
       return (d);
}

struct rpcent *
getrpcbynumber(int number)
{
       struct rpcent *rpc;

       setrpcent(0);
       while ((rpc = getrpcent()) != NULL) {
               if (rpc->r_number == number)
                       break;
       }
       endrpcent();
       return (rpc);
}

struct rpcent *
getrpcbyname(const char *name)
{
       struct rpcent *rpc;
       char **rp;

       _DIAGASSERT(name != NULL);

       setrpcent(0);
       while ((rpc = getrpcent()) != NULL) {
               if (strcmp(rpc->r_name, name) == 0)
                       break;
               for (rp = rpc->r_aliases; *rp != NULL; rp++) {
                       if (strcmp(*rp, name) == 0)
                               goto found;
               }
       }
found:
       endrpcent();
       return (rpc);
}

void
setrpcent(int f)
{
       struct rpcdata *d = _rpcdata();

       if (d == 0)
               return;
       if (d->rpcf == NULL)
               d->rpcf = fopen(RPCDB, "re");
       else
               rewind(d->rpcf);
       d->stayopen |= f;
}

void
endrpcent(void)
{
       struct rpcdata *d = _rpcdata();

       if (d == 0)
               return;
       if (d->rpcf && !d->stayopen) {
               fclose(d->rpcf);
               d->rpcf = NULL;
       }
}

struct rpcent *
getrpcent(void)
{
       struct rpcdata *d = _rpcdata();

       if (d == 0)
               return(NULL);
       if (d->rpcf == NULL && (d->rpcf = fopen(RPCDB, "re")) == NULL)
               return (NULL);
       if (fgets(d->line, BUFSIZ, d->rpcf) == NULL)
               return (NULL);
       return (interpret(d->line, strlen(d->line)));
}

static struct rpcent *
interpret(char *val, size_t len)
{
       struct rpcdata *d = _rpcdata();
       char *p;
       char *cp, **q;

       _DIAGASSERT(val != NULL);

       if (d == 0)
               return (0);
       strncpy(d->line, val, sizeof(d->line) - 1);
       d->line[sizeof(d->line) - 1] = '\0';
       p = d->line;
       d->line[len] = '\n';
       if (*p == '#')
               return (getrpcent());
       cp = strpbrk(p, "#\n");
       if (cp == NULL)
               return (getrpcent());
       *cp = '\0';
       cp = strpbrk(p, " \t");
       if (cp == NULL)
               return (getrpcent());
       *cp++ = '\0';
       /* THIS STUFF IS INTERNET SPECIFIC */
       d->rpc.r_name = d->line;
       while (*cp == ' ' || *cp == '\t')
               cp++;
       d->rpc.r_number = atoi(cp);
       q = d->rpc.r_aliases = d->rpc_aliases;
       cp = strpbrk(cp, " \t");
       if (cp != NULL)
               *cp++ = '\0';
       while (cp && *cp) {
               if (*cp == ' ' || *cp == '\t') {
                       cp++;
                       continue;
               }
               if (q < &(d->rpc_aliases[MAXALIASES - 1]))
                       *q++ = cp;
               cp = strpbrk(cp, " \t");
               if (cp != NULL)
                       *cp++ = '\0';
       }
       *q = NULL;
       return (&d->rpc);
}

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