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/*

 * 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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. 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.

 *

 *  $Id: getservent.c,v 1.2 2001-09-27 12:01:53 chris Exp $

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)getservent.c        8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <sys/socket.h>

#include <netdb.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#ifdef YP

#include <rpc/rpc.h>

#include <rpcsvc/yp_prot.h>

#include <rpcsvc/ypclnt.h>

static int serv_stepping_yp = 0;

extern int _yp_check __P(( char ** ));

#endif

#define MAXALIASES      35

static FILE *servf = NULL;

static char line[BUFSIZ+1];

static struct servent serv;

static char *serv_aliases[MAXALIASES];

int _serv_stayopen;

#ifdef YP

char *___getservbyname_yp = NULL;

char *___getservbyproto_yp = NULL;

int ___getservbyport_yp = 0;

static char *yp_domain = NULL;

static int

_getservbyport_yp(line)

        char *line;

{

        char *result;

        int resultlen;

        char buf[YPMAXRECORD + 2];

        int rv;

        snprintf(buf, sizeof(buf), "%d/%s", ntohs(___getservbyport_yp),

                                                ___getservbyproto_yp);

        ___getservbyport_yp = 0;

        ___getservbyproto_yp = NULL;

        if(!yp_domain) {

                if(yp_get_default_domain(&yp_domain))

                        return (0);

        }

        /*

         * We have to be a little flexible here. Ideally you're supposed

         * to have both a services.byname and a services.byport map, but

         * some systems have only services.byname. FreeBSD cheats a little

         * by putting the services.byport information in the same map as

         * services.byname so that either case will work. We allow for both

         * possibilities here: if there is no services.byport map, we try

         * services.byname instead.

         */

        if ((rv = yp_match(yp_domain, "services.byport", buf, strlen(buf),

                                                &result, &resultlen))) {

                if (rv == YPERR_MAP) {

                        if (yp_match(yp_domain, "services.byname", buf,

                                        strlen(buf), &result, &resultlen))

                        return(0);

                } else

                        return(0);

        }

        /* getservent() expects lines terminated with \n -- make it happy */

        snprintf(line, BUFSIZ, "%.*s\n", resultlen, result);

        free(result);

        return(1);

}

static int

_getservbyname_yp(line)

        char *line;

{

        char *result;

        int resultlen;

        char buf[YPMAXRECORD + 2];

        if(!yp_domain) {

                if(yp_get_default_domain(&yp_domain))

                        return (0);

        }

        snprintf(buf, sizeof(buf), "%s/%s", ___getservbyname_yp,

                                                ___getservbyproto_yp);

        ___getservbyname_yp = 0;

        ___getservbyproto_yp = NULL;

        if (yp_match(yp_domain, "services.byname", buf, strlen(buf),

                                                &result, &resultlen)) {

                return(0);

        }

        /* getservent() expects lines terminated with \n -- make it happy */

        snprintf(line, BUFSIZ, "%.*s\n", resultlen, result);

        free(result);

        return(1);

}

static int

_getservent_yp(line)

        char *line;

{

        static char *key = NULL;

        static int keylen;

        char *lastkey, *result;

        int resultlen;

        int rv;

        if(!yp_domain) {

                if(yp_get_default_domain(&yp_domain))

                        return (0);

        }

        if (!serv_stepping_yp) {

                if (key)

                        free(key);

                if ((rv = yp_first(yp_domain, "services.byname", &key, &keylen,

                             &result, &resultlen))) {

                        serv_stepping_yp = 0;

                        return(0);

                }

                serv_stepping_yp = 1;

        } else {

                lastkey = key;

                rv = yp_next(yp_domain, "services.byname", key, keylen, &key,

                             &keylen, &result, &resultlen);

                free(lastkey);

                if (rv) {

                        serv_stepping_yp = 0;

                        return (0);

                }

        }

        /* getservent() expects lines terminated with \n -- make it happy */

        snprintf(line, BUFSIZ, "%.*s\n", resultlen, result);

        free(result);

        return(1);

}

#endif

void

setservent(f)

        int f;

{

        if (servf == NULL)

                servf = fopen(_PATH_SERVICES, "r" );

        else

                rewind(servf);

        _serv_stayopen |= f;

}

void

endservent()

{

        if (servf) {

                fclose(servf);

                servf = NULL;

        }

        _serv_stayopen = 0;

}

struct servent *

getservent()

{

        char *p;

        register char *cp, **q;

#ifdef YP

        if (serv_stepping_yp && _getservent_yp(line)) {

                p = (char *)&line;

                goto unpack;

        }

tryagain:

#endif

        if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL)

                return (NULL);

again:

        if ((p = fgets(line, BUFSIZ, servf)) == NULL)

                return (NULL);

#ifdef YP

        if (*p == '+' && _yp_check(NULL)) {

                if (___getservbyname_yp != NULL) {

                        if (!_getservbyname_yp(line))

                                goto tryagain;

                }

                else if (___getservbyport_yp != 0) {

                        if (!_getservbyport_yp(line))

                                goto tryagain;

                }

                else if (!_getservent_yp(line))

                        goto tryagain;

        }

unpack:

#endif

        if (*p == '#')

                goto again;

        cp = strpbrk(p, "#\n");

        if (cp == NULL)

                goto again;

        *cp = '\0';

        serv.s_name = p;

        p = strpbrk(p, " \t");

        if (p == NULL)

                goto again;

        *p++ = '\0';

        while (*p == ' ' || *p == '\t')

                p++;

        cp = strpbrk(p, ",/");

        if (cp == NULL)

                goto again;

        *cp++ = '\0';

        serv.s_port = htons((u_short)atoi(p));

        serv.s_proto = cp;

        q = serv.s_aliases = serv_aliases;

        cp = strpbrk(cp, " \t");

        if (cp != NULL)

                *cp++ = '\0';

        while (cp && *cp) {

                if (*cp == ' ' || *cp == '\t') {

                        cp++;

                        continue;

                }

                if (q < &serv_aliases[MAXALIASES - 1])

                        *q++ = cp;

                cp = strpbrk(cp, " \t");

                if (cp != NULL)

                        *cp++ = '\0';

        }

        *q = NULL;

        return (&serv);

}