/*      $NetBSD: nis_pr.c,v 1.1.1.2 2012/09/09 16:07:55 christos Exp $  */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* 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: nis_pr.c,v 1.4 2005/04/27 04:56:33 sra Exp ";
#endif

/* Imports */

#include "port_before.h"

#ifndef WANT_IRS_NIS
static int __bind_irs_nis_unneeded;
#else

#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#ifdef T_NULL
#undef T_NULL                   /* Silence re-definition warning of T_NULL. */
#endif
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>

#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>

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

#include "port_after.h"

#include "irs_p.h"
#include "nis_p.h"

/* Definitions */

struct pvt {
       int             needrewind;
       char *          nis_domain;
       char *          curkey_data;
       int             curkey_len;
       char *          curval_data;
       int             curval_len;
       struct protoent proto;
       char *          prbuf;
};

enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 };

static /*const*/ char protocols_byname[] =      "protocols.byname";
static /*const*/ char protocols_bynumber[] =    "protocols.bynumber";

/* Forward */

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

static struct protoent *        makeprotoent(struct irs_pr *this);
static void                     nisfree(struct pvt *, enum do_what);

/* Public */

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

       if (!(pr = memget(sizeof *pr))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(pr, 0x5e, sizeof *pr);
       if (!(pvt = memget(sizeof *pvt))) {
               memput(pr, sizeof *pr);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       pvt->needrewind = 1;
       pvt->nis_domain = ((struct nis_p *)this->private)->domain;
       pr->private = pvt;
       pr->byname = pr_byname;
       pr->bynumber = pr_bynumber;
       pr->next = pr_next;
       pr->rewind = pr_rewind;
       pr->close = pr_close;
       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;

       nisfree(pvt, do_all);
       if (pvt->proto.p_aliases)
               free(pvt->proto.p_aliases);
       if (pvt->prbuf)
               free(pvt->prbuf);
       memput(pvt, sizeof *pvt);
       memput(this, sizeof *this);
}

static struct protoent *
pr_byname(struct irs_pr *this, const char *name) {
       struct pvt *pvt = (struct pvt *)this->private;
       int r;
       char *tmp;

       nisfree(pvt, do_val);
       DE_CONST(name, tmp);
       r = yp_match(pvt->nis_domain, protocols_byname, tmp,
                    strlen(tmp), &pvt->curval_data, &pvt->curval_len);
       if (r != 0) {
               errno = ENOENT;
               return (NULL);
       }
       return (makeprotoent(this));
}

static struct protoent *
pr_bynumber(struct irs_pr *this, int num) {
       struct pvt *pvt = (struct pvt *)this->private;
       char tmp[sizeof "-4294967295"];
       int r;

       nisfree(pvt, do_val);
       (void) sprintf(tmp, "%d", num);
       r = yp_match(pvt->nis_domain, protocols_bynumber, tmp, strlen(tmp),
                    &pvt->curval_data, &pvt->curval_len);
       if (r != 0) {
               errno = ENOENT;
               return (NULL);
       }
       return (makeprotoent(this));
}

static struct protoent *
pr_next(struct irs_pr *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct protoent *rval;
       int r;

       do {
               if (pvt->needrewind) {
                       nisfree(pvt, do_all);
                       r = yp_first(pvt->nis_domain, protocols_bynumber,
                                    &pvt->curkey_data, &pvt->curkey_len,
                                    &pvt->curval_data, &pvt->curval_len);
                       pvt->needrewind = 0;
               } else {
                       char *newkey_data;
                       int newkey_len;

                       nisfree(pvt, do_val);
                       r = yp_next(pvt->nis_domain, protocols_bynumber,
                                   pvt->curkey_data, pvt->curkey_len,
                                   &newkey_data, &newkey_len,
                                   &pvt->curval_data, &pvt->curval_len);
                       nisfree(pvt, do_key);
                       pvt->curkey_data = newkey_data;
                       pvt->curkey_len = newkey_len;
               }
               if (r != 0) {
                       errno = ENOENT;
                       return (NULL);
               }
               rval = makeprotoent(this);
       } while (rval == NULL);
       return (rval);
}

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

       pvt->needrewind = 1;
}

static void
pr_minimize(struct irs_pr *this) {
       UNUSED(this);
       /* NOOP */
}

/* Private */

static struct protoent *
makeprotoent(struct irs_pr *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       char *p, **t;
       int n, m;

       if (pvt->prbuf)
               free(pvt->prbuf);
       pvt->prbuf = pvt->curval_data;
       pvt->curval_data = NULL;

       for (p = pvt->prbuf; *p && *p != '#';)
               p++;
       while (p > pvt->prbuf && isspace((unsigned char)(p[-1])))
               p--;
       *p = '\0';

       p = pvt->prbuf;
       n = m = 0;

       pvt->proto.p_name = p;
       while (*p && !isspace((unsigned char)*p))
               p++;
       if (!*p)
               return (NULL);
       *p++ = '\0';

       while (*p && isspace((unsigned char)*p))
               p++;
       pvt->proto.p_proto = atoi(p);
       while (*p && !isspace((unsigned char)*p))
               p++;
       *p++ = '\0';

       while (*p) {
               if ((n + 1) >= m || !pvt->proto.p_aliases) {
                       m += 10;
                       t = realloc(pvt->proto.p_aliases,
                                     m * sizeof(char *));
                       if (!t) {
                               errno = ENOMEM;
                               goto cleanup;
                       }
                       pvt->proto.p_aliases = t;
               }
               pvt->proto.p_aliases[n++] = p;
               while (*p && !isspace((unsigned char)*p))
                       p++;
               if (*p)
                       *p++ = '\0';
       }
       if (!pvt->proto.p_aliases)
               pvt->proto.p_aliases = malloc(sizeof(char *));
       if (!pvt->proto.p_aliases)
               goto cleanup;
       pvt->proto.p_aliases[n] = NULL;
       return (&pvt->proto);

cleanup:
       if (pvt->proto.p_aliases) {
               free(pvt->proto.p_aliases);
               pvt->proto.p_aliases = NULL;
       }
       if (pvt->prbuf) {
               free(pvt->prbuf);
               pvt->prbuf = NULL;
       }
       return (NULL);
}

static void
nisfree(struct pvt *pvt, enum do_what do_what) {
       if ((do_what & do_key) && pvt->curkey_data) {
               free(pvt->curkey_data);
               pvt->curkey_data = NULL;
       }
       if ((do_what & do_val) && pvt->curval_data) {
               free(pvt->curval_data);
               pvt->curval_data = NULL;
       }
}

#endif /*WANT_IRS_NIS*/

/*! \file */

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