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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2005,2008,2010-2015,2022 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
/*
* Trivial replacements for the libc getgrent() family of functions.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include <grp.h>
#include <sudo_compat.h>
#include <sudo_util.h>
#undef GRMEM_MAX
#define GRMEM_MAX 200
static FILE *grf;
static const char *grfile = "/etc/group";
static int gr_stayopen;
void mysetgrfile(const char *);
void mysetgrent(void);
void myendgrent(void);
int mysetgroupent(int);
struct group *mygetgrent(void);
struct group *mygetgrnam(const char *);
struct group *mygetgrgid(gid_t);
void
mysetgrfile(const char *file)
{
grfile = file;
if (grf != NULL)
myendgrent();
}
static int
open_group(int reset)
{
if (grf == NULL) {
grf = fopen(grfile, "r");
if (grf != NULL) {
if (fcntl(fileno(grf), F_SETFD, FD_CLOEXEC) == -1) {
fclose(grf);
grf = NULL;
}
}
if (grf == NULL)
return 0;
} else if (reset) {
rewind(grf);
}
return 1;
}
int
mysetgroupent(int stayopen)
{
if (!open_group(1))
return 0;
gr_stayopen = stayopen;
return 1;
}
void
mysetgrent(void)
{
mysetgroupent(0);
}
void
myendgrent(void)
{
if (grf != NULL) {
fclose(grf);
grf = NULL;
}
gr_stayopen = 0;
}
struct group *
mygetgrent(void)
{
static struct group gr;
static char grbuf[LINE_MAX], *gr_mem[GRMEM_MAX+1];
size_t len;
id_t id;
char *cp, *colon;
const char *errstr;
int n;
if (!open_group(0))
return NULL;
next_entry:
if ((colon = fgets(grbuf, sizeof(grbuf), grf)) == NULL)
return NULL;
memset(&gr, 0, sizeof(gr));
if ((colon = strchr(cp = colon, ':')) == NULL)
goto next_entry;
*colon++ = '\0';
gr.gr_name = cp;
if ((colon = strchr(cp = colon, ':')) == NULL)
goto next_entry;
*colon++ = '\0';
gr.gr_passwd = cp;
if ((colon = strchr(cp = colon, ':')) == NULL)
goto next_entry;
*colon++ = '\0';
id = sudo_strtoid(cp, &errstr);
if (errstr != NULL)
goto next_entry;
gr.gr_gid = (gid_t)id;
len = strlen(colon);
if (len > 0 && colon[len - 1] == '\n')
colon[len - 1] = '\0';
if (*colon != '\0') {
char *last;
gr.gr_mem = gr_mem;
cp = strtok_r(colon, ",", &last);
for (n = 0; cp != NULL && n < GRMEM_MAX; n++) {
gr.gr_mem[n] = cp;
cp = strtok_r(NULL, ",", &last);
}
gr.gr_mem[n] = NULL;
} else
gr.gr_mem = NULL;
return &gr;
}
struct group *
mygetgrnam(const char *name)
{
struct group *gr;
if (!open_group(1))
return NULL;
while ((gr = mygetgrent()) != NULL) {
if (strcmp(gr->gr_name, name) == 0)
break;
}
if (!gr_stayopen) {
fclose(grf);
grf = NULL;
}
return gr;
}
struct group *
mygetgrgid(gid_t gid)
{
struct group *gr;
if (!open_group(1))
return NULL;
while ((gr = mygetgrent()) != NULL) {
if (gr->gr_gid == gid)
break;
}
if (!gr_stayopen) {
fclose(grf);
grf = NULL;
}
return gr;
}
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