libsocket/inet/getprotoent_r.c

	getprotoent_r.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 1986-1992 by Sun Microsystems Inc.
 */

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

#include <ctype.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <nss_dbdefs.h>

static int str2protoent(const char *, int, void *,
        char *, int);

static int proto_stayopen;
/*
 * Unsynchronized, but it affects only
 * efficiency, not correctness
 */

static DEFINE_NSS_DB_ROOT(db_root);
static DEFINE_NSS_GETENT(context);

static void
_nss_initf_proto(nss_db_params_t *p)
{
    p->name = NSS_DBNAM_PROTOCOLS;
    p->default_config = NSS_DEFCONF_PROTOCOLS;
}

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

    NSS_XbyY_INIT(&arg, result, buffer, buflen, str2protoent);
    arg.key.name    = name;
    arg.stayopen    = proto_stayopen;
    res = nss_search(&db_root, _nss_initf_proto,
        NSS_DBOP_PROTOCOLS_BYNAME, &arg);
    arg.status = res;
    (void) NSS_XbyY_FINI(&arg);
    return ((struct protoent *)arg.returnval);
}

struct protoent *
getprotobynumber_r(int proto, struct protoent *result, char *buffer, int buflen)
{
    nss_XbyY_args_t arg;
    nss_status_t    res;

    NSS_XbyY_INIT(&arg, result, buffer, buflen, str2protoent);
    arg.key.number = proto;
    arg.stayopen    = proto_stayopen;
    res = nss_search(&db_root, _nss_initf_proto,
        NSS_DBOP_PROTOCOLS_BYNUMBER, &arg);
    arg.status = res;
    (void) NSS_XbyY_FINI(&arg);
    return ((struct protoent *)arg.returnval);
}

int
setprotoent(int stay)
{
    proto_stayopen = stay;
    nss_setent(&db_root, _nss_initf_proto, &context);
    return (0);
}

int
endprotoent()
{
    proto_stayopen = 0;
    nss_endent(&db_root, _nss_initf_proto, &context);
    nss_delete(&db_root);
    return (0);
}

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

    NSS_XbyY_INIT(&arg, result, buffer, buflen, str2protoent);
    /* No stayopen flag;  of course you stay open for iteration */
    res = nss_getent(&db_root, _nss_initf_proto, &context, &arg);
    arg.status = res;
    (void) NSS_XbyY_FINI(&arg);
    return ((struct protoent *)arg.returnval);
}

/*
 * Return values: 0 = success, 1 = parse error, 2 = erange ...
 * The structure pointer passed in is a structure in the caller's space
 * wherein the field pointers would be set to areas in the buffer if
 * need be. instring and buffer should be separate areas. Let's not
 * fight over crumbs.
 */
static int
str2protoent(const char *instr, int lenstr,
    void *ent /* it is really (struct protoent *) */,
    char *buffer, int buflen)
{
    struct  protoent *proto = (struct protoent *)ent;
    const char  *p, *numstart, *namestart, *limit;
    int     numlen, namelen = 0;
    char        numbuf[16];
    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 = (int)(p - namestart);

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

    while (p < limit && isspace(*p)) {
        p++;
    }
    if (p >= limit) {
        /* Syntax error -- no proto number */
        return (NSS_STR_PARSE_PARSE);
    }
    numstart = p;
    do {
        p++;        /* Find the end of the proto number */
    } while (p < limit && !isspace(*p));
    numlen = (int)(p - numstart);
    if (numlen >= (int)sizeof (numbuf)) {
        /* Syntax error -- supposed number is too long */
        return (NSS_STR_PARSE_PARSE);
    }
    (void) memcpy(numbuf, numstart, (size_t)numlen);
    numbuf[numlen] = '\0';
    proto->p_proto = (int)strtol(numbuf, &numend, 10);
    if (*numend != '\0') {
        /* Syntax error -- protocol number isn't a number */
        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) {
            /* hope they don't try to peek in */
            proto->p_aliases = 0;
            return (NSS_STR_PARSE_ERANGE);
        } else {
            *ptr = 0;
            proto->p_aliases = ptr;
            return (NSS_STR_PARSE_SUCCESS);
        }
    }
    proto->p_aliases = _nss_netdb_aliases(p, lenstr - (int)(p - instr),
                buffer + namelen + 1, buflen - namelen - 1);
    return (NSS_STR_PARSE_SUCCESS);
}