| 1 | /* chown/chgrp - Change file ownership Author: V. Archer */
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| 2 |
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| 3 | /* Copyright 1991 by Vincent Archer
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| 4 | * You may freely redistribute this software, in source or binary
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| 5 | * form, provided that you do not alter this copyright mention in any
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| 6 | * way.
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| 7 | */
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| 8 |
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| 9 | /* Changed 3 Feb 93 by Kees J. Bot: setuid execution nonsense removed.
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| 10 | */
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| 11 |
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| 12 | #include <sys/types.h>
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| 13 | #include <sys/stat.h>
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| 14 | #include <ctype.h>
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| 15 | #include <dirent.h>
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| 16 | #include <pwd.h>
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| 17 | #include <grp.h>
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| 18 | #include <string.h>
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| 19 | #include <limits.h>
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| 20 | #include <errno.h>
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| 21 | #include <stdlib.h>
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| 22 | #include <unistd.h>
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| 23 | #include <minix/minlib.h>
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| 24 | #include <stdio.h>
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| 25 |
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| 26 | #ifndef S_ISLNK
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| 27 | #define S_ISLNK(mode) 0
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| 28 | #define lstat stat
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| 29 | #endif
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| 30 |
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| 31 | #define S_IUGID (S_ISUID|S_ISGID)
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| 32 |
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| 33 | /* Global variables, such as flags and path names */
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| 34 | int gflag, oflag, rflag, error;
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| 35 | char *pgmname, path[PATH_MAX + 1];
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| 36 | uid_t nuid;
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| 37 | gid_t ngid;
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| 38 |
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| 39 | _PROTOTYPE(int main, (int argc, char **argv));
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| 40 | _PROTOTYPE(void do_chown, (char *file));
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| 41 | _PROTOTYPE(void usage, (void));
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| 42 |
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| 43 | /* Main module. If chown(1) is invoked as chgrp(1), the behaviour is nearly
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| 44 | * identical, except that the default when a single name is given as an
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| 45 | * argument is to take a group id rather than an user id. This allow the
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| 46 | * non-Posix "chgrp user:group file".
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| 47 | * The single option switch used by chown/chgrp (-R) does not warrant a
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| 48 | * call to the getopt stuff. The two others flags (-g, -u) are set from
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| 49 | * the program name and arguments.
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| 50 | */
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| 51 | int main(argc, argv)
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| 52 | int argc;
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| 53 | char *argv[];
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| 54 | {
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| 55 | char *id, *id2;
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| 56 | struct group *grp;
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| 57 | struct passwd *pwp;
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| 58 |
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| 59 | if (pgmname = strrchr(*argv, '/'))
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| 60 | pgmname++;
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| 61 | else
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| 62 | pgmname = *argv;
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| 63 | argc--;
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| 64 | argv++;
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| 65 | gflag = strcmp(pgmname, "chgrp");
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| 66 |
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| 67 | if (argc && **argv == '-' && argv[0][1] == 'R') {
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| 68 | argc--;
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| 69 | argv++;
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| 70 | rflag = 1;
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| 71 | }
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| 72 | if (argc < 2) usage();
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| 73 |
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| 74 | id = *argv++;
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| 75 | argc--;
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| 76 | if (id2 = strchr(id, ':')) *id2++ = '\0';
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| 77 | if (!id2 && !gflag) {
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| 78 | id2 = id;
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| 79 | id = 0;
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| 80 | }
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| 81 | if (id) {
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| 82 | if (isdigit(*id))
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| 83 | nuid = atoi(id);
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| 84 | else {
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| 85 | if (!(pwp = getpwnam(id))) {
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| 86 | std_err(id);
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| 87 | std_err(": unknown user name\n");
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| 88 | exit(1);
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| 89 | }
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| 90 | nuid = pwp->pw_uid;
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| 91 | }
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| 92 | oflag = 1;
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| 93 | } else
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| 94 | oflag = 0;
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| 95 |
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| 96 | if (id2) {
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| 97 | if (isdigit(*id2))
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| 98 | ngid = atoi(id2);
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| 99 | else {
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| 100 | if (!(grp = getgrnam(id2))) {
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| 101 | std_err(id2);
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| 102 | std_err(": unknown group name\n");
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| 103 | exit(1);
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| 104 | }
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| 105 | ngid = grp->gr_gid;
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| 106 | }
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| 107 | gflag = 1;
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| 108 | } else
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| 109 | gflag = 0;
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| 110 |
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| 111 | error = 0;
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| 112 | while (argc--) do_chown(*argv++);
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| 113 | return(error);
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| 114 | }
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| 115 |
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| 116 | /* Apply the user/group modification here.
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| 117 | */
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| 118 | void do_chown(file)
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| 119 | char *file;
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| 120 | {
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| 121 | DIR *dirp;
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| 122 | struct dirent *entp;
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| 123 | char *namp;
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| 124 | struct stat st;
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| 125 |
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| 126 | if (lstat(file, &st)) {
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| 127 | perror(file);
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| 128 | error = 1;
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| 129 | return;
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| 130 | }
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| 131 |
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| 132 | if (S_ISLNK(st.st_mode) && rflag) return; /* Note: violates POSIX. */
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| 133 |
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| 134 | if (chown(file, oflag ? nuid : st.st_uid, gflag ? ngid : st.st_gid)) {
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| 135 | perror(file);
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| 136 | error = 1;
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| 137 | }
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| 138 |
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| 139 | if (S_ISDIR(st.st_mode) && rflag) {
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| 140 | if (!(dirp = opendir(file))) {
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| 141 | perror(file);
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| 142 | error = 1;
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| 143 | return;
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| 144 | }
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| 145 | if (path != file) strcpy(path, file);
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| 146 | namp = path + strlen(path);
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| 147 | *namp++ = '/';
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| 148 | while (entp = readdir(dirp))
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| 149 | if (entp->d_name[0] != '.' ||
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| 150 | (entp->d_name[1] &&
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| 151 | (entp->d_name[1] != '.' || entp->d_name[2]))) {
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| 152 | strcpy(namp, entp->d_name);
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| 153 | do_chown(path);
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| 154 | }
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| 155 | closedir(dirp);
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| 156 | *--namp = '\0';
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| 157 | }
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| 158 | }
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| 159 |
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| 160 | /* Posix prototype of the chown/chgrp function */
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| 161 | void usage()
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| 162 | {
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| 163 | std_err("Usage: ");
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| 164 | std_err(pgmname);
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| 165 | std_err(gflag ? " owner[:group]" : " [owner:]group");
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| 166 | std_err(" file...\n");
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| 167 | exit(1);
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| 168 | }
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