115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/**
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* @brief chown - bad implementation thereof
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2018 K. Lange
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <pwd.h>
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static int usage(char * argv[]) {
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fprintf(stderr, "usage: %s [OWNER][:[GROUP]] FILE...\n", argv[0]);
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return 1;
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}
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static int invalid(char * argv[], char c) {
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fprintf(stderr, "%s: %c: unrecognized option\n", argv[0], c);
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return 1;
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}
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static int parse_user_group(char * argv[], char * arg, uid_t * user, gid_t * group) {
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/* Does this look like a number? */
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if (*arg >= '0' && *arg <= '9') {
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/* Try to extract */
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char * endptr;
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unsigned long int number = strtoul(arg, &endptr, 10);
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if (*endptr != ':' && *endptr != '\0') {
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fprintf(stderr, "%s: %s: Invalid user/group specification\n", argv[0], arg);
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}
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*user = number;
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arg = endptr;
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} else if (*arg == ':') {
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*user = -1;
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arg++;
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} else {
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char * colon = strstr(arg, ":");
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if (colon) {
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*colon = '\0';
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}
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/* Check name */
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struct passwd * userEnt = getpwnam(arg);
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if (!userEnt) {
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fprintf(stderr, "%s: %s: Invalid user\n", argv[0], arg);
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return 1;
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}
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*user = userEnt->pw_uid;
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if (colon) {
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arg = colon + 1;
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} else {
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arg = NULL;
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}
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}
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if (arg && *arg) {
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if (*arg >= '0' && *arg <= '9') {
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char * endptr;
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unsigned long int number = strtoul(arg, &endptr, 10);
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if (*endptr != '\0') {
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fprintf(stderr, "%s: %s: Invalid group specification\n", argv[0], arg);
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}
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*group = number;
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arg = endptr;
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} else {
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struct passwd * userEnt = getpwnam(arg);
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if (!userEnt) {
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fprintf(stderr, "%s: %s: Invalid group\n", argv[0], arg);
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return 1;
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}
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*group = userEnt->pw_uid;
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}
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}
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return 0;
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}
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int main(int argc, char * argv[]) {
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int i = 1;
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for (; i < argc; i++) {
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if (argv[i][0] != '-') break;
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switch (argv[i][0]) {
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case 'h':
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return usage(argv);
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default:
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return invalid(argv,argv[i][0]);
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}
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}
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if (i + 1 >= argc) return usage(argv);
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uid_t user = -1;
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uid_t group = -1;
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if (parse_user_group(argv, argv[i++], &user, &group)) return 1;
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if (user == -1 && group == -1) return 0;
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int retval = 0;
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for (; i < argc; i++) {
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if (chown(argv[i], user, group)) {
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fprintf(stderr, "%s: %s: %s\n", argv[0], argv[i], strerror(errno));
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retval = 1;
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}
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}
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return retval;
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}
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