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/*
Copyright (C) 2000-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Inetutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see `http://www.gnu.org/licenses/'. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
#include <mgetgroups.h>
#include "extern.h"
#ifndef LINE_MAX
# define LINE_MAX 2048
#endif
int
display_file (const char *name, int code)
{
char *cp, line[LINE_MAX];
FILE *fp = fopen (name, "r");
if (fp != NULL)
{
while (fgets (line, sizeof (line), fp) != NULL)
{
cp = strchr (line, '\n');
if (cp != NULL)
*cp = '\0';
lreply (code, "%s", line);
}
fflush (stdout);
fclose (fp);
return 0;
}
return errno;
}
/*
* Check if a user is in the file `filename',
* typically PATH_FTPUSERS or PATH_FTPCHROOT.
* Return 1 if yes, 0 otherwise.
*/
int
checkuser (const char *filename, const char *name)
{
FILE *fp;
int found = 0, ngroups = 0;
char *p, line[BUFSIZ];
gid_t *groups = NULL;
struct passwd *pwd = NULL;
fp = fopen (filename, "r");
if (fp != NULL)
{
while (fgets (line, sizeof (line), fp) != NULL)
{
/* Properly terminate input. */
p = strchr (line, '\n');
if (p != NULL)
*p = '\0';
/* Disregard initial blank characters. */
p = line;
while (isblank (*p))
p++;
/* Skip comments, and empty lines. */
if (*p == '#' || *p == 0)
continue;
/* Wildcard entry, a single '@'. */
if (p[0] == '@' && (p[1] == 0 || isblank (p[1])))
{
found = 1;
break;
}
/* Group entries begin with '@' and are non-trivial. */
if (p[0] == '@' && p[1] && !isblank (p[1]))
{
/* The group list is generated only if needed,
* and only once.
*/
if (!groups)
{
pwd = getpwnam (name);
if (pwd)
ngroups = mgetgroups (name, pwd->pw_gid, &groups);
}
/* Check for group membership. */
if ((ngroups > 0) && groups && pwd)
{
struct group *grp;
char *gname;
/* Identify valid group name. */
gname = ++p;
while (*p && (isalnum (*p) || *p == '_' || *p == '-'))
p++;
*p = '\0'; /* Group name ends here. */
grp = getgrnam (gname);
if (grp)
{
int j;
for (j = 0; j < ngroups; j++)
if (groups[j] == grp->gr_gid)
{
found = 1;
break;
}
}
}
continue; /* No match, or failure. */
}
/* User name ends at the first blank character. */
if (strncmp (p, name, strlen (name)) == 0
&& (p[strlen (name)] == 0 || isblank (p[strlen (name)])))
{
found = 1;
break;
}
}
free (groups);
fclose (fp);
}
return (found);
}
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