/* chown -- change user and group ownership of files Copyright (C) 1989, 1990, 1991 Free Software Foundation, Inc. This program 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 2, or (at your option) any later version. This program 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* | user | unchanged explicit -------------|-------------------------+-------------------------| g unchanged | --- | chown u | r |-------------------------+-------------------------| o explicit | chgrp g or chown .g | chown u.g | u |-------------------------+-------------------------| p from passwd| --- | chown u. | |-------------------------+-------------------------| Written by David MacKenzie . */ #include #include #include #include #include #include #include "system.h" #ifndef _POSIX_VERSION struct passwd *getpwnam (); struct group *getgrnam (); struct group *getgrgid (); #endif #ifdef _POSIX_SOURCE #define endgrent() #define endpwent() #endif int lstat (); char *parse_user_spec (); char *savedir (); char *xmalloc (); char *xrealloc (); int change_file_owner (); int change_dir_owner (); int isnumber (); void describe_change (); void error (); void usage (); /* The name the program was run with. */ char *program_name; /* If nonzero, change the ownership of directories recursively. */ int recurse; /* If nonzero, force silence (no error messages). */ int force_silent; /* If nonzero, describe the files we process. */ int verbose; /* If nonzero, describe only owners or groups that change. */ int changes_only; /* The name of the user to which ownership of the files is being given. */ char *username; /* The name of the group to which ownership of the files is being given. */ char *groupname; struct option long_options[] = { {"recursive", 0, 0, 'R'}, {"changes", 0, 0, 'c'}, {"silent", 0, 0, 'f'}, {"quiet", 0, 0, 'f'}, {"verbose", 0, 0, 'v'}, {0, 0, 0, 0} }; void main (argc, argv) int argc; char **argv; { int user = -1; /* New uid; -1 if not to be changed. */ int group = -1; /* New gid; -1 if not to be changed. */ int errors = 0; int optc; char *e; program_name = argv[0]; recurse = force_silent = verbose = changes_only = 0; while ((optc = getopt_long (argc, argv, "Rcfv", long_options, (int *) 0)) != EOF) { switch (optc) { case 'R': recurse = 1; break; case 'c': verbose = 1; changes_only = 1; break; case 'f': force_silent = 1; break; case 'v': verbose = 1; break; default: usage (); } } if (optind >= argc - 1) usage (); e = parse_user_spec (argv[optind], &user, &group, &username, &groupname); if (e) error (1, 0, "%s: %s", argv[optind], e); if (username == NULL) username = ""; for (++optind; optind < argc; ++optind) errors |= change_file_owner (argv[optind], user, group); exit (errors); } /* Change the ownership of FILE to UID USER and GID GROUP. If it is a directory and -R is given, recurse. Return 0 if successful, 1 if errors occurred. */ int change_file_owner (file, user, group) char *file; int user, group; { struct stat file_stats; int newuser, newgroup; int errors = 0; if (lstat (file, &file_stats)) { if (force_silent == 0) error (0, errno, "%s", file); return 1; } newuser = user == -1 ? file_stats.st_uid : user; newgroup = group == -1 ? file_stats.st_gid : group; if (newuser != file_stats.st_uid || newgroup != file_stats.st_gid) { if (verbose) describe_change (file, 1); if (chown (file, newuser, newgroup)) { if (force_silent == 0) error (0, errno, "%s", file); errors = 1; } } else if (verbose && changes_only == 0) describe_change (file, 0); if (recurse && S_ISDIR (file_stats.st_mode)) errors |= change_dir_owner (file, user, group, &file_stats); return errors; } /* Recursively change the ownership of the files in directory DIR to UID USER and GID GROUP. STATP points to the results of lstat on DIR. Return 0 if successful, 1 if errors occurred. */ int change_dir_owner (dir, user, group, statp) char *dir; int user, group; struct stat *statp; { char *name_space, *namep; char *path; /* Full path of each entry to process. */ unsigned dirlength; /* Length of `dir' and '\0'. */ unsigned filelength; /* Length of each pathname to process. */ unsigned pathlength; /* Bytes allocated for `path'. */ int errors = 0; errno = 0; name_space = savedir (dir, statp->st_size); if (name_space == NULL) { if (errno) { if (force_silent == 0) error (0, errno, "%s", dir); return 1; } else error (1, 0, "virtual memory exhausted"); } dirlength = strlen (dir) + 1; /* + 1 is for the trailing '/'. */ pathlength = dirlength + 1; /* Give `path' a dummy value; it will be reallocated before first use. */ path = xmalloc (pathlength); strcpy (path, dir); path[dirlength - 1] = '/'; for (namep = name_space; *namep; namep += filelength - dirlength) { filelength = dirlength + strlen (namep) + 1; if (filelength > pathlength) { pathlength = filelength * 2; path = xrealloc (path, pathlength); } strcpy (path + dirlength, namep); errors |= change_file_owner (path, user, group); } free (path); free (name_space); return errors; } /* Tell the user the user and group names to which ownership of FILE has been given; if CHANGED is zero, FILE had those owners already. */ void describe_change (file, changed) char *file; int changed; { if (changed) printf ("owner of %s changed to ", file); else printf ("owner of %s retained as ", file); if (groupname) printf ("%s.%s\n", username, groupname); else printf ("%s\n", username); } void usage () { fprintf (stderr, "\ Usage: %s [-Rcfv] [--recursive] [--changes] [--silent] [--quiet]\n\ [--verbose] [user][:.][group] file...\n", program_name); exit (1); }