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/*-
* Copyright (c) 1996 by David L. Nugent <davidn@blaze.net.au>.
* 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 as
* the first lines of this file unmodified.
* 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 David L. Nugent.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DAVID L. NUGENT ``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 DAVID L. NUGENT 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.
*
* $Id$
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <fcntl.h>
#include <sys/param.h>
#include <ctype.h>
#include "pwupd.h"
static int
isingroup(char const * name, char **mem)
{
int i;
for (i = 0; i < MAXGROUPS && mem[i] != NULL; i++)
if (strcmp(name, mem[i]) == 0)
return i;
return -1;
}
static char groupfile[] = _PATH_GROUP;
static char grouptmp[] = _PATH_GROUP ".new";
int
editgroups(char *name, char **groups)
{
int rc = 0;
int infd;
if ((infd = open(groupfile, O_RDWR | O_CREAT | O_EXLOCK, 0644)) != -1) {
FILE *infp;
if ((infp = fdopen(infd, "r+")) == NULL)
close(infd);
else {
int outfd;
if ((outfd = open(grouptmp, O_RDWR | O_CREAT | O_TRUNC | O_EXLOCK, 0644)) != -1) {
FILE *outfp;
if ((outfp = fdopen(outfd, "w+")) == NULL)
close(outfd);
else {
char line[MAXPWLINE];
char outl[MAXPWLINE];
while (fgets(line, sizeof(line), infp) != NULL) {
char *p = strchr(line, '\n');
if (p == NULL) { /* Line too long */
int ch;
fputs(line, outfp);
while ((ch = fgetc(infp)) != EOF) {
fputc(ch, outfp);
if (ch == '\n')
break;
}
continue;
}
if (*line == '#')
strcpy(outl, line);
else if (*line == '\n')
*outl = '\0';
else {
int i,
mno = 0;
char *cp = line;
char const *sep = ":\n";
struct group grp;
char *mems[MAXGROUPS];
memset(&grp, 0, sizeof grp);
grp.gr_mem = mems;
for (i = 0; (p = strsep(&cp, sep)) != NULL; i++) {
switch (i) {
case 0: /* Group name */
grp.gr_name = p;
break;
case 1: /* Group password */
grp.gr_passwd = p;
break;
case 2: /* Group id */
grp.gr_gid = atoi(p);
break;
case 3: /* Member list */
cp = p;
sep = ",\n";
break;
default: /* Individual members */
if (mno < MAXGROUPS && *p)
mems[mno++] = p;
break;
}
}
if (i < 2) /* Bail out -
* insufficient fields */
continue;
for (i = mno; i < MAXGROUPS; i++)
mems[i] = NULL;
/*
* Delete from group, or add to group?
*/
if (groups == NULL || isingroup(grp.gr_name, groups) == -1) { /* Delete */
int idx;
while ((idx = isingroup(name, mems)) != -1) {
for (i = idx; i < (MAXGROUPS - 1); i++)
mems[i] = mems[i + 1];
mems[i] = NULL;
--mno;
}
/*
* Special case - deleting user and group may be user's own
*/
if (groups == NULL && mems[0] == NULL && strcmp(name, grp.gr_name) == 0) { /* First, make _sure_ we
* don't have other
* members */
struct passwd *pwd;
setpwent();
while ((pwd = getpwent()) != NULL && pwd->pw_gid != grp.gr_gid);
endpwent();
if (pwd == NULL) /* No members at all */
continue; /* Drop the group */
}
} else if (isingroup(name, mems) == -1)
mems[mno++] = name;
fmtgrentry(outl, &grp, PWF_GROUP);
}
fputs(outl, outfp);
}
if (fflush(outfp) != EOF) {
rc = 1;
/*
* Copy data back into the original file and truncate
*/
rewind(infp);
rewind(outfp);
while (fgets(line, sizeof(line), outfp) != NULL)
fputs(line, infp);
/*
* This is a gross hack, but we may have corrupted the
* original file. Unfortunately, it will lose preservation
* of the inode.
*/
if (fflush(infp) == EOF || ferror(infp))
rc = rename(grouptmp, groupfile) == 0;
else
ftruncate(infd, ftell(infp));
}
fclose(outfp);
}
remove(grouptmp);
}
fclose(infp);
}
}
return rc;
}
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