lib/librpc/rpc/getrpcent.c

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user or with the express written consent of
 * Sun Microsystems, Inc.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)getrpcent.c 1.14 91/03/11 Copyr 1984 Sun Micro";*/
static char *rcsid = "$Id: getrpcent.c,v 1.7 1993/08/26 00:53:23 jtc Exp $";
#endif

/*
 * Copyright (c) 1984 by Sun Microsystems, Inc.
 */

#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include <rpc/rpc.h>
#ifdef YP
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#endif

/*
 * Internet version.
 */
struct rpcdata {
        FILE    *rpcf;
        int     stayopen;
#define MAXALIASES      35
        char    *rpc_aliases[MAXALIASES];
        struct  rpcent rpc;
        char    line[BUFSIZ+1];
#ifdef  YP
        char    *domain;
        char    *current;
        int     currentlen;
#endif
} *rpcdata;

#ifdef  YP
static int      __yp_nomap = 0;
#endif  /* YP */

static  struct rpcent *interpret();
struct  hostent *gethostent();
char    *inet_ntoa();

static char RPCDB[] = "/etc/rpc";

static struct rpcdata *
_rpcdata()
{
        register struct rpcdata *d = rpcdata;

        if (d == 0) {
                d = (struct rpcdata *)calloc(1, sizeof (struct rpcdata));
                rpcdata = d;
        }
        return (d);
}

struct rpcent *
getrpcbynumber(number)
        register int number;
{
        register struct rpcdata *d = _rpcdata();
        register struct rpcent *p;
#ifdef  YP
        int reason;
        char adrstr[16];
#endif

        if (d == 0)
                return (0);
#ifdef  YP
        if (!__yp_nomap && _yp_check(&d->domain)) {
                sprintf(adrstr, "%d", number);
                reason = yp_match(d->domain, "rpc.bynumber", adrstr, strlen(adrstr),
                                  &d->current, &d->currentlen);
                switch(reason) {
                case 0:
                        break;
                case YPERR_MAP:
                        __yp_nomap = 1;
                        goto no_yp;
                        break;
                default:
                        return(0);
                        break;
                }
                d->current[d->currentlen] = '\0';
                p = interpret(d->current, d->currentlen);
                (void) free(d->current);
                return p;
        }
no_yp:
#endif  /* YP */
        setrpcent(0);
        while (p = getrpcent()) {
                if (p->r_number == number)
                        break;
        }
        endrpcent();
        return (p);
}

struct rpcent *
getrpcbyname(name)
        char *name;
{
        struct rpcent *rpc;
        char **rp;

        setrpcent(0);
        while (rpc = getrpcent()) {
                if (strcmp(rpc->r_name, name) == 0)
                        return (rpc);
                for (rp = rpc->r_aliases; *rp != NULL; rp++) {
                        if (strcmp(*rp, name) == 0)
                                return (rpc);
                }
        }
        endrpcent();
        return (NULL);
}

void
setrpcent(f)
        int f;
{
        register struct rpcdata *d = _rpcdata();

        if (d == 0)
                return;
#ifdef  YP
        if (!__yp_nomap && _yp_check(NULL)) {
                if (d->current)
                        free(d->current);
                d->current = NULL;
                d->currentlen = 0;
                return;
        }
        __yp_nomap = 0;
#endif  /* YP */
        if (d->rpcf == NULL)
                d->rpcf = fopen(RPCDB, "r");
        else
                rewind(d->rpcf);
        d->stayopen |= f;
}

void
endrpcent()
{
        register struct rpcdata *d = _rpcdata();

        if (d == 0)
                return;
#ifdef  YP
        if (!__yp_nomap && _yp_check(NULL)) {
                if (d->current && !d->stayopen)
                        free(d->current);
                d->current = NULL;
                d->currentlen = 0;
                return;
        }
        __yp_nomap = 0;
#endif  /* YP */
        if (d->rpcf && !d->stayopen) {
                fclose(d->rpcf);
                d->rpcf = NULL;
        }
}

struct rpcent *
getrpcent()
{
        struct rpcent *hp;
        int reason;
        register struct rpcdata *d = _rpcdata();
#ifdef  YP
        char *key = NULL, *val = NULL;
        int keylen, vallen;
#endif

        if (d == 0)
                return(NULL);
#ifdef  YP
        if (!__yp_nomap && _yp_check(&d->domain)) {
                if (d->current == NULL && d->currentlen == 0) {
                        reason = yp_first(d->domain, "rpc.bynumber",
                                          &d->current, &d->currentlen,
                                          &val, &vallen);
                } else {
                        reason = yp_next(d->domain, "rpc.bynumber",
                                         d->current, d->currentlen,
                                         &d->current, &d->currentlen,
                                         &val, &vallen);
                }
                switch(reason) {
                case 0:
                        break;
                case YPERR_MAP:
                        __yp_nomap = 1;
                        goto no_yp;
                        break;
                default:
                        return(0);
                        break;
                }
                val[vallen] = '\0';
                hp = interpret(val, vallen);
                (void) free(val);
                return hp;
        }
no_yp:
#endif  /* YP */
        if (d->rpcf == NULL && (d->rpcf = fopen(RPCDB, "r")) == NULL)
                return (NULL);
        if (fgets(d->line, BUFSIZ, d->rpcf) == NULL)
                return (NULL);
        return (interpret(d->line, strlen(d->line)));
}

static struct rpcent *
interpret(val, len)
        char *val;
        int len;
{
        register struct rpcdata *d = _rpcdata();
        char *p;
        register char *cp, **q;

        if (d == 0)
                return (0);
        (void) strncpy(d->line, val, len);
        p = d->line;
        d->line[len] = '\n';
        if (*p == '#')
                return (getrpcent());
        cp = strpbrk(p, "#\n");
        if (cp == NULL)
                return (getrpcent());
        *cp = '\0';
        cp = strpbrk(p, " \t");
        if (cp == NULL)
                return (getrpcent());
        *cp++ = '\0';
        /* THIS STUFF IS INTERNET SPECIFIC */
        d->rpc.r_name = d->line;
        while (*cp == ' ' || *cp == '\t')
                cp++;
        d->rpc.r_number = atoi(cp);
        q = d->rpc.r_aliases = d->rpc_aliases;
        cp = strpbrk(cp, " \t");
        if (cp != NULL)
                *cp++ = '\0';
        while (cp && *cp) {
                if (*cp == ' ' || *cp == '\t') {
                        cp++;
                        continue;
                }
                if (q < &(d->rpc_aliases[MAXALIASES - 1]))
                        *q++ = cp;
                cp = strpbrk(cp, " \t");
                if (cp != NULL)
                        *cp++ = '\0';
        }
        *q = NULL;
        return (&d->rpc);
}