getrpcent.c

操作系统SunOS 4.1.3版本的源码

#if !defined(lint) && defined(SCCSIDS)
static  char sccsid[] = "@(#)getrpcent.c 1.1 92/07/30  Copyr 1990 Sun Micro";
#endif

/* 
 * Copyright (c) 1990 by Sun Microsystems, Inc.
 */

#include <stdio.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <rpcsvc/ypclnt.h>

/*
 * Internet version.
 */
struct rpcdata {
	FILE	*rpcf;
	char	*current;
	int	currentlen;
	int	stayopen;
#define	MAXALIASES	35
	char	*rpc_aliases[MAXALIASES];
	struct	rpcent rpc;
	char	line[BUFSIZ+1];
	char	*domain;
	int	usingyellow;
} *rpcdata, *_rpcdata();

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

static char *RPCDB = "/etc/rpc";

static char *YPMAP = "rpc.bynumber";

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;
	int reason;
	char adrstr[16], *val = NULL;
	int vallen;

	if (d == 0)
		return (0);
	setrpcent(0);
	if (!d->usingyellow) {
		while (p = getrpcent()) {
			if (p->r_number == number)
				break;
		}
	}
	else {
		sprintf(adrstr, "%d", number);
		if (reason = yp_match(d->domain, YPMAP,
		    adrstr, strlen(adrstr), &val, &vallen)) {
                    if (yp_ismapthere(reason)==0) {
                        d->usingyellow=0;
                        return(getrpcbynumber(number));
                    }
#ifdef DEBUG
			fprintf(stderr, "reason yp_match failed is %d\n",
			    reason);
#endif
			p = NULL;
		    }
		else {
			p = interpret(val, vallen);
			free(val);
		}
	}
	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) {
			endrpcent();
			return (rpc);

		}

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

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

	if (d == 0)
		return;
	if (d->rpcf == NULL)
		d->rpcf = fopen(RPCDB, "r");
	else
		rewind(d->rpcf);
	if (d->current)
		free(d->current);
	d->current = NULL;
	d->stayopen |= f;
	yellowup();	/* recompute whether NIS are up */
}

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

	if (d == 0)
		return;
	if (d->current && !d->stayopen) {
		free(d->current);
		d->current = NULL;
	}
	if (d->rpcf && !d->stayopen) {
		fclose(d->rpcf);
		d->rpcf = NULL;
	}
}

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

	if (d == 0)
		return (0);
	yellowup();
	if (!d->usingyellow) {
		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));
	}
	if (d->current == NULL) {
		if (reason =  yp_first(d->domain, YPMAP,
		    &key, &keylen, &val, &vallen)) {
                    if (yp_ismapthere(reason)==0) {
                        d->usingyellow=0;
                        return(getrpcent());
                    }

#ifdef DEBUG
			fprintf(stderr, "reason yp_first failed is %d\n",
			    reason);
#endif
			return NULL;
		    }
	}
	else {
		if (reason = yp_next(d->domain, YPMAP,
		    d->current, d->currentlen, &key, &keylen, &val, &vallen)) {
                    if (yp_ismapthere(reason)==0) {
                        d->usingyellow=0;
                        return(getrpcent());
			}
#ifdef DEBUG
			fprintf(stderr, "reason yp_next failed is %d\n",
			    reason);
#endif
			return NULL;
		}
	}
	if (d->current)
		free(d->current);
	d->current = key;
	d->currentlen = keylen;
	hp = interpret(val, vallen);
	free(val);
	return (hp);
}

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

	if (d == 0)
		return (0);
	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);
}

/* 
 * check to see if NIS are up, and store that fact in d->usingyellow.
 */
static
yellowup()
{
	register struct rpcdata *d = _rpcdata();

	if (d == 0)
		return;
	if (d->domain == NULL) {
	       yp_get_default_domain(&d->domain);
		       if (d->domain) d->usingyellow=1;
		       else d->usingyellow=0;
	}
}