181 lines
3.3 KiB
C
181 lines
3.3 KiB
C
/* chown/chgrp - Change file ownership Author: V. Archer */
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/* Copyright 1991 by Vincent Archer
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* You may freely redistribute this software, in source or binary
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* form, provided that you do not alter this copyright mention in any
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* way.
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*/
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/* Changed 3 Feb 93 by Kees J. Bot: setuid execution nonsense removed.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <pwd.h>
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#include <grp.h>
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#include <string.h>
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#include <limits.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <minix/minlib.h>
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#include <stdio.h>
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#ifndef S_ISLNK
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#define S_ISLNK(mode) 0
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#define lstat stat
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#endif
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#define S_IUGID (S_ISUID|S_ISGID)
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/* Global variables, such as flags and path names */
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int gflag, oflag, rflag, error, hflag = 0;
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char *pgmname, path[PATH_MAX + 1];
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uid_t nuid;
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gid_t ngid;
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int main(int argc, char **argv);
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void do_chown(char *file);
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void usage(void);
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/* Main module. If chown(1) is invoked as chgrp(1), the behaviour is nearly
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* identical, except that the default when a single name is given as an
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* argument is to take a group id rather than an user id. This allow the
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* non-Posix "chgrp user:group file".
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*/
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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char *id, *id2;
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struct group *grp;
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struct passwd *pwp;
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int ch;
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if (pgmname = strrchr(*argv, '/'))
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pgmname++;
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else
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pgmname = *argv;
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gflag = strcmp(pgmname, "chgrp");
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while((ch = getopt(argc, argv, "Rh")) != -1) {
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switch(ch) {
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case 'R':
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rflag = 1;
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break;
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case 'h':
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hflag = 1;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 2) usage();
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id = *argv++;
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argc--;
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if (id2 = strchr(id, ':')) *id2++ = '\0';
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if (!id2 && !gflag) {
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id2 = id;
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id = 0;
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}
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if (id) {
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if (isdigit(*id))
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nuid = atoi(id);
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else {
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if (!(pwp = getpwnam(id))) {
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std_err(id);
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std_err(": unknown user name\n");
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exit(1);
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}
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nuid = pwp->pw_uid;
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}
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oflag = 1;
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} else
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oflag = 0;
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if (id2) {
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if (isdigit(*id2))
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ngid = atoi(id2);
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else {
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if (!(grp = getgrnam(id2))) {
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std_err(id2);
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std_err(": unknown group name\n");
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exit(1);
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}
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ngid = grp->gr_gid;
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}
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gflag = 1;
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} else
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gflag = 0;
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error = 0;
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while (argc--) do_chown(*argv++);
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return(error);
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}
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/* Apply the user/group modification here.
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*/
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void do_chown(file)
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char *file;
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{
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DIR *dirp;
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struct dirent *entp;
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char *namp;
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struct stat st;
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if (lstat(file, &st)) {
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perror(file);
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error = 1;
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return;
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}
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if (S_ISLNK(st.st_mode) && rflag) return; /* Note: violates POSIX. */
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if (S_ISLNK(st.st_mode) && hflag) {
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fprintf(stderr, "chown: cannot lchown %s\n", file);
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error = 1;
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}
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if (chown(file, oflag ? nuid : st.st_uid, gflag ? ngid : st.st_gid)) {
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perror(file);
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error = 1;
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}
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if (S_ISDIR(st.st_mode) && rflag) {
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if (!(dirp = opendir(file))) {
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perror(file);
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error = 1;
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return;
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}
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if (path != file) strcpy(path, file);
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namp = path + strlen(path);
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*namp++ = '/';
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while (entp = readdir(dirp))
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if (entp->d_name[0] != '.' ||
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(entp->d_name[1] &&
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(entp->d_name[1] != '.' || entp->d_name[2]))) {
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strcpy(namp, entp->d_name);
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do_chown(path);
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}
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closedir(dirp);
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*--namp = '\0';
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}
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}
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/* Posix prototype of the chown/chgrp function */
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void usage()
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{
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std_err("Usage: ");
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std_err(pgmname);
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std_err(gflag ? " owner[:group]" : " [owner:]group");
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std_err(" file...\n");
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exit(1);
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}
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