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/* $OpenBSD: getrpcent.c,v 1.22 2020/10/13 04:42:28 guenther Exp $ */
/*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the "Oracle America, Inc." 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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 <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <limits.h>
#include <rpc/rpc.h>
/*
* Internet version.
*/
static struct rpcdata {
FILE *rpcf;
int stayopen;
#define MAXALIASES 35
char *rpc_aliases[MAXALIASES];
struct rpcent rpc;
char line[BUFSIZ+1];
} *rpcdata;
static struct rpcent *interpret(char *val, int len);
static const char RPCDB[] = "/etc/rpc";
static struct rpcdata *
_rpcdata(void)
{
struct rpcdata *d = rpcdata;
if (d == NULL) {
d = calloc(1, sizeof (struct rpcdata));
rpcdata = d;
}
return (d);
}
struct rpcent *
getrpcbynumber(int number)
{
struct rpcdata *d = _rpcdata();
struct rpcent *p;
if (d == NULL)
return (0);
setrpcent(0);
while ((p = getrpcent())) {
if (p->r_number == number)
break;
}
endrpcent();
return (p);
}
struct rpcent *
getrpcbyname(char *name)
{
struct rpcent *rpc;
char **rp;
setrpcent(0);
while ((rpc = getrpcent())) {
if (strcmp(rpc->r_name, name) == 0)
goto done;
for (rp = rpc->r_aliases; *rp != NULL; rp++) {
if (strcmp(*rp, name) == 0)
goto done;
}
}
done:
endrpcent();
return (rpc);
}
void
setrpcent(int f)
{
struct rpcdata *d = _rpcdata();
if (d == NULL)
return;
if (d->rpcf == NULL)
d->rpcf = fopen(RPCDB, "re");
else
rewind(d->rpcf);
d->stayopen |= f;
}
DEF_WEAK(setrpcent);
void
endrpcent(void)
{
struct rpcdata *d = _rpcdata();
if (d == NULL)
return;
if (d->rpcf && !d->stayopen) {
fclose(d->rpcf);
d->rpcf = NULL;
}
}
DEF_WEAK(endrpcent);
struct rpcent *
getrpcent(void)
{
struct rpcdata *d = _rpcdata();
if (d == NULL)
return(NULL);
if (d->rpcf == NULL && (d->rpcf = fopen(RPCDB, "re")) == NULL)
return (NULL);
/* -1 so there is room to append a \n below */
if (fgets(d->line, sizeof(d->line) - 1, d->rpcf) == NULL)
return (NULL);
return (interpret(d->line, strlen(d->line)));
}
DEF_WEAK(getrpcent);
static struct rpcent *
interpret(char *val, int len)
{
const char *errstr;
struct rpcdata *d = _rpcdata();
char *p;
char *cp, *num, **q;
if (d == NULL)
return (0);
strlcpy(d->line, val, sizeof(d->line));
p = d->line;
p[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++;
num = cp;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
d->rpc.r_number = strtonum(num, 0, INT_MAX, &errstr);
if (errstr)
return (0);
q = d->rpc.r_aliases = d->rpc_aliases;
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);
}
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