/*      $NetBSD: getservent_r.c,v 1.11 2011/10/15 23:00:02 christos Exp $       */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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[] = "@(#)getservent.c        8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getservent_r.c,v 1.11 2011/10/15 23:00:02 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

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

#include <FindDirectory.h>

#include <libutil.h>
#include "servent.h"

#ifdef __weak_alias
__weak_alias(endservent_r,_endservent_r)
__weak_alias(getservent_r,_getservent_r)
__weak_alias(setservent_r,_setservent_r)
#endif

int
_servent_open(struct servent_data *sd)
{
        char buffer[256];

        if (sd->flags & (_SV_CDB | _SV_PLAINFILE)) {
                sd->flags |= _SV_FIRST;
                return 0;
        }

        free(sd->line);
        sd->line = NULL;
        free(sd->cdb_buf);
        sd->cdb_buf = NULL;
        sd->cdb_buf_len = 0;
        free(sd->aliases);
        sd->aliases = NULL;
        sd->maxaliases = 0;
        sd->flags |= _SV_FIRST;

#if 0
        sd->cdb = cdbr_open(_PATH_SERVICES_CDB, CDBR_DEFAULT);
        if (sd->cdb != NULL) {
                sd->flags |= _SV_CDB;
                return 0;
        }
#endif

        find_directory(B_SYSTEM_DATA_DIRECTORY, 0, false, buffer, sizeof(buffer));
        strlcat(buffer, "/network/ports", sizeof(buffer));

        sd->plainfile = fopen(buffer, "re");
        if (sd->plainfile != NULL) {
                sd->flags |= _SV_PLAINFILE;
                return 0;
        }
        return -1;
}

void
_servent_close(struct servent_data *sd)
{
#if 0
        if (sd->flags & _SV_CDB) {
                cdbr_close(sd->cdb);
                sd->cdb = NULL;
                sd->flags &= ~_SV_CDB;
        }
#endif

        if (sd->flags & _SV_PLAINFILE) {
                (void)fclose(sd->plainfile);
                sd->plainfile = NULL;
                sd->flags &= ~_SV_PLAINFILE;
        }
        sd->flags &= ~_SV_STAYOPEN;
}


int
_servent_getline(struct servent_data *sd)
{
#if 0
        if (sd->flags & _SV_CDB)
                return -1;
#endif

        if ((sd->flags & _SV_PLAINFILE) == 0)
                return -1;

        free(sd->line);
        sd->line = NULL;

        if (sd->flags & _SV_FIRST) {
                (void)rewind((FILE *)sd->plainfile);
                sd->flags &= ~_SV_FIRST;
        }
        sd->line = fparseln(sd->plainfile, NULL, NULL, NULL,
            FPARSELN_UNESCALL);
        return sd->line == NULL ? -1 : 0;
}

struct servent *
_servent_parseline(struct servent_data *sd, struct servent *sp)
{
        size_t i = 0;
        int oerrno;
        char *p, *cp, **q;

        if (sd->line == NULL)
                return NULL;

        sp->s_name = p = sd->line;
        p = strpbrk(p, " \t");
        if (p == NULL)
                return NULL;
        *p++ = '\0';
        while (*p == ' ' || *p == '\t')
                p++;
        cp = strpbrk(p, ",/");
        if (cp == NULL)
                return NULL;
        *cp++ = '\0';
        sp->s_port = htons((u_short)atoi(p));
        sp->s_proto = cp;
        if (sd->aliases == NULL) {
                sd->maxaliases = 10;
                sd->aliases = calloc(sd->maxaliases, sizeof(*sd->aliases));
                if (sd->aliases == NULL) {
                        oerrno = errno;
                        endservent_r(sd);
                        errno = oerrno;
                        return NULL;
                }
        }
        sp->s_aliases = sd->aliases;
        cp = strpbrk(cp, " \t");
        if (cp != NULL)
                *cp++ = '\0';
        while (cp && *cp) {
                if (*cp == ' ' || *cp == '\t') {
                        cp++;
                        continue;
                }
                if (i == sd->maxaliases - 2) {
                        sd->maxaliases *= 2;
                        q = realloc(sd->aliases, sd->maxaliases * sizeof(*q));
                        if (q == NULL) {
                                oerrno = errno;
                                endservent_r(sd);
                                errno = oerrno;
                                return NULL;
                        }
                        sp->s_aliases = sd->aliases = q;
                }
                sp->s_aliases[i++] = cp;
                cp = strpbrk(cp, " \t");
                if (cp != NULL)
                        *cp++ = '\0';
        }
        sp->s_aliases[i] = NULL;
        return sp;
}

void
setservent_r(int f, struct servent_data *sd)
{
        (void)_servent_open(sd);
        sd->flags |= f ? _SV_STAYOPEN : 0;
}

void
endservent_r(struct servent_data *sd)
{
        _servent_close(sd);
        free(sd->aliases);
        sd->aliases = NULL;
        sd->maxaliases = 0;
        free(sd->line);
        sd->line = NULL;
        free(sd->cdb_buf);
        sd->cdb_buf = NULL;
        sd->cdb_buf_len = 0;
}

struct servent *
getservent_r(struct servent *sp, struct servent_data *sd)
{

        if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0 &&
            _servent_open(sd) == -1)
                return NULL;

#if 0
        if (sd->flags & _SV_CDB) {
                const void *data;
                size_t len;

                if (sd->flags & _SV_FIRST) {
                        sd->cdb_index = 0;
                        sd->flags &= ~_SV_FIRST;
                }

                if (cdbr_get(sd->cdb, sd->cdb_index, &data, &len))
                        return NULL;
                ++sd->cdb_index;
                return _servent_parsedb(sd, sp, data, len);
        }
#endif
        if (sd->flags & _SV_PLAINFILE) {
                for (;;) {
                        if (_servent_getline(sd) == -1)
                                return NULL;
                        if (_servent_parseline(sd, sp) == NULL)
                                continue;
                        return sp;
                }
        }
        return NULL;
}

struct servent *
_servent_parsedb(struct servent_data *sd, struct servent *sp,
    const uint8_t *data, size_t len)
{
        char **q;
        size_t i;
        int oerrno;

        if ((sd->flags & _SV_STAYOPEN) == 0) {
                if (len > sd->cdb_buf_len) {
                        void *tmp = realloc(sd->cdb_buf, len);
                        if (tmp == NULL)
                                goto fail;
                        sd->cdb_buf = tmp;
                        sd->cdb_buf_len = len;
                }
                memcpy(sd->cdb_buf, data, len);
                data = sd->cdb_buf;
        }

        if (len < 2)
                goto fail;
        sp->s_port = *(uint16_t*)data;
        data += 2;
        len -= 2;

        if (len == 0 || len < (size_t)data[0] + 2)
                goto fail;
        sp->s_proto = __UNCONST(data + 1);

        if (sp->s_proto[data[0]] != '\0')
                goto fail;

        len -= 2 + data[0];
        data += 2 + data[0];

        if (len == 0)
                goto fail;
        if (len < (size_t)data[0] + 2)
                goto fail;

        sp->s_name = __UNCONST(data + 1);
        len -= 2 + data[0];
        data += 2 + data[0];

        if (sd->aliases == NULL) {
                sd->maxaliases = 10;
                sd->aliases = malloc(sd->maxaliases * sizeof(char *));
                if (sd->aliases == NULL)
                        goto fail;
        }
        sp->s_aliases = sd->aliases;
        i = 0;
        while (len) {
                if (len < (size_t)data[0] + 2)
                        goto fail;
                if (i == sd->maxaliases - 2) {
                        sd->maxaliases *= 2;
                        q = realloc(sd->aliases, sd->maxaliases * sizeof(*q));
                        if (q == NULL)
                                goto fail;
                        sp->s_aliases = sd->aliases = q;
                }
                sp->s_aliases[i++] = __UNCONST(data + 1);
                len -= 2 + data[0];
                data += 2 + data[0];
        }
        sp->s_aliases[i] = NULL;
        return sp;

fail:
        oerrno = errno;
        endservent_r(sd);
        errno = oerrno;
        return NULL;
}