libnsl/nss/getrpcent_r.c

/*
 * 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.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#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);
}