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#define _POSIX_C_SOURCE 200809L
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <limits.h>
#include <dirent.h>
#include <errno.h>
#include <ctype.h>
typedef enum
{
RMODE_FOLLOW_ROOT,
RMODE_FOLLOW_ALL,
RMODE_NO_FOLLOW,
} t_recursive_mode;
typedef enum
{
VLEVEL_CHANGE,
VLEVEL_QUIET,
VLEVEL_VERBOSE,
} t_verbose_level;
static t_verbose_level g_verbosity = VLEVEL_QUIET;
static bool g_follow_link = true;
static bool g_recursive = false;
static t_recursive_mode g_recursive_mode = RMODE_NO_FOLLOW;
static char *g_name = "chown";
static uid_t g_user_id = -1;
static gid_t g_group_id = -1;
void verror_log(const char *format, va_list ap)
{
fprintf(stderr, "%s: ", g_name);
vfprintf(stderr, format, ap);
fputc('\n', stderr);
}
void error_log(const char *format, ...)
{
va_list ap;
va_start(ap, format);
verror_log(format, ap);
va_end(ap);
}
void fatal(const char *format, ...)
{
va_list ap;
va_start(ap, format);
verror_log(format, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
bool parse_id(char *id_str, id_t *id_ptr, bool group)
{
char *end;
if (isdigit(*id_str))
{
errno = 0;
long tmp = strtol(id_str, &end, 10);
if (errno != 0 || tmp > UINT_MAX || *end != '\0')
return false;
*id_ptr = (id_t)tmp;
}
else
{
struct passwd *pw = getpwnam(id_str);
if (pw == NULL)
return false;
if (group)
*id_ptr = pw->pw_gid;
else
*id_ptr = pw->pw_uid;
}
return true;
}
bool file_chown(char *path, bool root)
{
char recursive_path[PATH_MAX + 1] = {'\0'};
struct stat statbuf;
if (stat(path, &statbuf) == -1)
{
error_log("cannot access '%s': %s", path, strerror(errno));
return false;
}
errno = 0;
if ((!g_recursive && g_follow_link)
|| (g_recursive && (g_recursive_mode == RMODE_FOLLOW_ALL
|| (root && g_recursive_mode == RMODE_FOLLOW_ROOT))))
chown(path, g_user_id, g_group_id);
else
lchown(path, g_user_id, g_group_id);
if (errno != 0)
{
error_log("changing ownership of '%s': %s", path, strerror(errno));
return false;
}
if (g_recursive)
{
errno = 0;
DIR *directory = opendir(path);
if (directory == NULL && errno == ENOTDIR)
return true;
if (directory == NULL)
{
error_log("cannot access '%s': %s", path, strerror(errno));
return false;
}
strcpy(recursive_path, path);
if (path[strlen(path) - 1] != '/')
strcat(recursive_path, "/");
struct dirent *entry;
while ((entry = readdir(directory)) != NULL)
{
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
continue;
strcat(recursive_path, entry->d_name);
file_chown(recursive_path, false);
strrchr(recursive_path, '/')[1] = '\0';
}
closedir(directory);
}
return true;
}
/*
**
** TODO
** don't change group/user if not asked
** change group to login group is trailling : after user in cmd
**
*/
int main(int argc, char **argv)
{
int option;
while ((option = getopt(argc, argv, "cfvhRHLP")) != -1)
{
switch (option)
{
case 'c': g_verbosity = VLEVEL_CHANGE; break;
case 'f': g_verbosity = VLEVEL_QUIET; break;
case 'v': g_verbosity = VLEVEL_VERBOSE; break;
case 'h': g_follow_link = false; break;
case 'R': g_recursive = true; break;
case 'H': g_recursive_mode = RMODE_FOLLOW_ROOT; break;
case 'L': g_recursive_mode = RMODE_FOLLOW_ALL; break;
case 'P': g_recursive_mode = RMODE_NO_FOLLOW; break;
}
}
if (argc - optind == 0)
fatal("missing operand");
if (argc - optind == 1)
fatal("missing operand after '%s'", argv[optind]);
char *user_str = argv[optind];
char *group_str = strchr(argv[optind], ':');
if (group_str != NULL)
{
*group_str = '\0';
group_str++;
}
if (!parse_id(user_str, &g_user_id, false))
fatal("invalid user '%s'", user_str);
if (group_str != NULL && !parse_id(group_str, &g_group_id, true))
fatal("invalid group '%s:%s'", user_str, group_str);
for (optind++; optind < argc; optind++)
file_chown(argv[optind], true);
return EXIT_SUCCESS;
}
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