source: rtems/c/src/libnetworking/libc/getservent.c @ 39e6e65a

/*
 * 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.
 */

#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);
}