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/*
checkown.c
Checks for the existance of a file or directory and creates it
if necessary. It can also correct its ownership.
Copyright 2007 Gentoo Foundation
*/
#define APPLET "checkown"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "builtins.h"
#include "einfo.h"
static char *applet = NULL;
static int do_check (char *path, uid_t uid, gid_t gid, mode_t mode, int file)
{
struct stat st;
memset (&st, 0, sizeof (struct stat));
if (stat (path, &st)) {
if (file) {
int fd;
einfo ("%s: creating file", path);
if ((fd = open (path, O_CREAT)) == -1) {
eerror ("%s: open: %s", applet, strerror (errno));
return (-1);
}
close (fd);
} else {
einfo ("%s: creating directory", path);
if (! mode)
mode = S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH;
if (mkdir (path, mode)) {
eerror ("%s: mkdir: %s", applet, strerror (errno));
return (-1);
}
mode = 0;
}
} else {
if ((file && S_ISDIR (st.st_mode)) ||
(! file && ! S_ISDIR (st.st_mode)))
{
if (file)
eerror ("%s: is a directory", path);
else
eerror ("%s: is a file", path);
return (-1);
}
}
if (mode && (st.st_mode & 0777) != mode) {
einfo ("%s: correcting mode", applet);
if (chmod (path, mode)) {
eerror ("%s: chmod: %s", applet, strerror (errno));
return (-1);
}
}
if (st.st_uid != uid || st.st_gid != gid) {
if (st.st_dev || st.st_ino)
einfo ("%s: correcting owner", path);
if (chown (path, uid, gid)) {
eerror ("%s: chown: %s", applet, strerror (errno));
return (-1);
}
}
return (0);
}
/* Based on busybox */
static int parse_mode (mode_t *mode, char *text)
{
/* Check for a numeric mode */
if ((*mode - '0') < 8) {
char *p;
unsigned long l = strtoul (text, &p, 8);
if (*p || l > 07777U) {
errno = EINVAL;
return (-1);
}
*mode = l;
return (0);
}
/* We currently don't check g+w type stuff */
errno = EINVAL;
return (-1);
}
static struct passwd *get_user (char **name)
{
struct passwd *pw;
char *p = *name;
char *token;
int tid;
token = strsep (&p, ":");
if (sscanf (token, "%d", &tid) != 1)
pw = getpwnam (token);
else
pw = getpwuid (tid);
if (pw)
*name = p;
return (pw);
}
static struct group *get_group (const char *name)
{
int tid;
if (sscanf (name, "%d", &tid) != 1)
return (getgrnam (name));
else
return (getgrgid (tid));
}
#include "_usage.h"
#define getoptstring "fm:g:u:" getoptstring_COMMON
static struct option longopts[] = {
{ "directory", 0, NULL, 'd'},
{ "file", 0, NULL, 'f'},
{ "mode", 1, NULL, 'm'},
{ "user", 1, NULL, 'u'},
{ "group", 1, NULL, 'g'},
longopts_COMMON
{ NULL, 0, NULL, 0}
};
#include "_usage.c"
int checkown (int argc, char **argv)
{
int opt;
uid_t uid = geteuid();
gid_t gid = getgid();
mode_t mode = 0;
struct passwd *pw = NULL;
struct group *gr = NULL;
bool file = 0;
char *p;
int retval = EXIT_SUCCESS;
applet = argv[0];
while ((opt = getopt_long (argc, argv, getoptstring,
longopts, (int *) 0)) != -1)
{
switch (opt) {
case 'd':
file = 0;
break;
case 'f':
file = 1;
break;
case 'm':
if (parse_mode (&mode, optarg))
eerrorx ("%s: invalid mode `%s'", applet, optarg);
break;
case 'u':
p = optarg;
if (! (pw = get_user (&p)))
eerrorx ("%s: user `%s' not found", applet, optarg);
if (p && *p)
optarg = p;
else
break;
case 'g':
if (! (gr = get_group (optarg)))
eerrorx ("%s: group `%s' not found", applet, optarg);
break;
case_RC_COMMON_GETOPT
}
}
if (pw) {
uid = pw->pw_uid;
gid = pw->pw_gid;
}
if (gr)
gid = gr->gr_gid;
while (optind < argc) {
if (do_check (argv[optind], uid, gid, mode, file))
retval = EXIT_FAILURE;
optind++;
}
exit (retval);
}
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