/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Rentrant (MT-safe) getrpcYY interfaces.
 */

#include "mt.h"
#include <ctype.h>
#include <nss_dbdefs.h>
#include <stdlib.h>
#include <string.h>
#include <rpc/rpcent.h>

extern int str2rpcent(const char *, int, void *, char *, int);

static int rpc_stayopen;        /* Unsynchronized, but it affects only  */
                                /*   efficiency, not correctness        */
static DEFINE_NSS_DB_ROOT(db_root);
static DEFINE_NSS_GETENT(context);

void
_nss_initf_rpc(nss_db_params_t *p)
{
        p->name = NSS_DBNAM_RPC;
        p->default_config = NSS_DEFCONF_RPC;
}

struct rpcent *
getrpcbyname_r(const char *name, struct rpcent *result, char *buffer,
                                                                int buflen)
{
        nss_XbyY_args_t arg;
        nss_status_t    res;

        if (name == (const char *)NULL) {
                errno = ERANGE;
                return (NULL);
        }
        NSS_XbyY_INIT(&arg, result, buffer, buflen, str2rpcent);
        arg.key.name    = name;
        arg.stayopen    = rpc_stayopen;
        res = nss_search(&db_root, _nss_initf_rpc,
                NSS_DBOP_RPC_BYNAME, &arg);
        arg.status = res;
        return ((struct rpcent *)NSS_XbyY_FINI(&arg));
}

struct rpcent *
getrpcbynumber_r(const int number, struct rpcent *result, char *buffer,
                                                                int buflen)
{
        nss_XbyY_args_t arg;
        nss_status_t    res;

        NSS_XbyY_INIT(&arg, result, buffer, buflen, str2rpcent);
        arg.key.number  = number;
        arg.stayopen    = rpc_stayopen;
        res = nss_search(&db_root, _nss_initf_rpc,
                NSS_DBOP_RPC_BYNUMBER, &arg);
        arg.status = res;
        return ((struct rpcent *)NSS_XbyY_FINI(&arg));
}

void
setrpcent(const int stay)
{
        rpc_stayopen |= stay;
        nss_setent(&db_root, _nss_initf_rpc, &context);
}

void
endrpcent(void)
{
        rpc_stayopen = 0;
        nss_endent(&db_root, _nss_initf_rpc, &context);
        nss_delete(&db_root);
}

struct rpcent *
getrpcent_r(struct rpcent *result, char *buffer, int buflen)
{
        nss_XbyY_args_t arg;
        nss_status_t    res;

        NSS_XbyY_INIT(&arg, result, buffer, buflen, str2rpcent);
        /* No key, no stayopen */
        res = nss_getent(&db_root, _nss_initf_rpc, &context, &arg);
        arg.status = res;
        return ((struct rpcent *)NSS_XbyY_FINI(&arg));
}

int
str2rpcent(const char *instr, int lenstr, void *ent, char *buffer, int buflen)
{
        struct rpcent   *rpc    = (struct rpcent *)ent;
        const char      *p, *numstart, *limit, *namestart;
        ssize_t         numlen, namelen = 0;
        char            numbuf[12];
        char            *numend;

        if ((instr >= buffer && (buffer + buflen) > instr) ||
                        (buffer >= instr && (instr + lenstr) > buffer))
                return (NSS_STR_PARSE_PARSE);

        p = instr;
        limit = p + lenstr;

        while (p < limit && isspace(*p)) {
                p++;
        }
        namestart = p;
        while (p < limit && !isspace(*p)) {
                p++;            /* Skip over the canonical name */
        }
        namelen = p - namestart;

        if (buflen <= namelen)          /* not enough buffer */
                return (NSS_STR_PARSE_ERANGE);
        (void) memcpy(buffer, namestart, namelen);
        buffer[namelen] = '\0';
        rpc->r_name = buffer;

        while (p < limit && isspace(*p)) {
                p++;
        }
        if (p >= limit)                 /* Syntax error -- no RPC number */
                return (NSS_STR_PARSE_PARSE);
        numstart = p;
        do {
                p++;            /* Find the end of the RPC number */
        } while (p < limit && !isspace(*p));
        numlen = p - numstart;
        if (numlen >= sizeof (numbuf)) {
                /* Syntax error -- supposed number is too long */
                return (NSS_STR_PARSE_PARSE);
        }
        (void) memcpy(numbuf, numstart, numlen);
        numbuf[numlen] = '\0';
        rpc->r_number = (int)strtol(numbuf, &numend, 10);
        if (*numend != '\0')
                return (NSS_STR_PARSE_PARSE);

        while (p < limit && isspace(*p)) {
                p++;
        }
        /*
         * Although nss_files_XY_all calls us with # stripped,
         * we should be able to deal with it here in order to
         * be more useful.
         */
        if (p >= limit || *p == '#') { /* no aliases, no problem */
                char **ptr;

                ptr = (char **)ROUND_UP(buffer + namelen + 1,
                                                        sizeof (char *));
                if ((char *)ptr >= buffer + buflen) {
                        rpc->r_aliases = 0; /* hope they don't try to peek in */
                        return (NSS_STR_PARSE_ERANGE);
                }
                *ptr = 0;
                rpc->r_aliases = ptr;
                return (NSS_STR_PARSE_SUCCESS);
        }
        rpc->r_aliases = _nss_netdb_aliases(p, (int)(lenstr - (p - instr)),
                        buffer + namelen + 1, (int)(buflen - namelen - 1));
        return (NSS_STR_PARSE_SUCCESS);
}