| 1 | /* |
| 2 | * Copyright (c) 1988 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * %sccs.include.redist.c% |
| 6 | */ |
| 7 | |
| 8 | #ifndef lint |
| 9 | char copyright[] = |
| 10 | "@(#) Copyright (c) 1988 Regents of the University of California.\n\ |
| 11 | All rights reserved.\n"; |
| 12 | #endif /* not lint */ |
| 13 | |
| 14 | #ifndef lint |
| 15 | static char sccsid[] = "@(#)chown.c 5.15 (Berkeley) %G%"; |
| 16 | #endif /* not lint */ |
| 17 | |
| 18 | #include <sys/param.h> |
| 19 | #include <sys/stat.h> |
| 20 | #include <sys/errno.h> |
| 21 | #include <dirent.h> |
| 22 | #include <pwd.h> |
| 23 | #include <grp.h> |
| 24 | #include <stdio.h> |
| 25 | #include <ctype.h> |
| 26 | |
| 27 | int ischown, uid, gid, fflag, rflag, retval; |
| 28 | char *gname, *myname; |
| 29 | |
| 30 | main(argc, argv) |
| 31 | int argc; |
| 32 | char **argv; |
| 33 | { |
| 34 | extern char *optarg; |
| 35 | extern int optind; |
| 36 | register char *cp; |
| 37 | int ch; |
| 38 | char curpath[MAXPATHLEN], *reset, *index(), *rindex(); |
| 39 | |
| 40 | myname = (cp = rindex(*argv, '/')) ? cp + 1 : *argv; |
| 41 | ischown = myname[2] == 'o'; |
| 42 | |
| 43 | while ((ch = getopt(argc, argv, "Rf")) != EOF) |
| 44 | switch((char)ch) { |
| 45 | case 'R': |
| 46 | rflag++; |
| 47 | break; |
| 48 | case 'f': |
| 49 | fflag++; |
| 50 | break; |
| 51 | case '?': |
| 52 | default: |
| 53 | usage(); |
| 54 | } |
| 55 | argv += optind; |
| 56 | argc -= optind; |
| 57 | |
| 58 | if (argc < 2) |
| 59 | usage(); |
| 60 | |
| 61 | if (ischown) { |
| 62 | if (cp = index(*argv, '.')) { |
| 63 | *cp++ = '\0'; |
| 64 | setgid(cp); |
| 65 | } |
| 66 | else |
| 67 | gid = -1; |
| 68 | setuid(*argv); |
| 69 | } |
| 70 | else { |
| 71 | uid = -1; |
| 72 | setgid(*argv); |
| 73 | } |
| 74 | |
| 75 | while (*++argv) { |
| 76 | if (reset = index(*argv, '/')) |
| 77 | (void)getwd(curpath); |
| 78 | change(*argv); |
| 79 | if (reset && chdir(curpath)) { |
| 80 | if (fflag) |
| 81 | exit(0); |
| 82 | err(curpath); |
| 83 | exit(-1); |
| 84 | } |
| 85 | } |
| 86 | exit(retval); |
| 87 | } |
| 88 | |
| 89 | setgid(s) |
| 90 | register char *s; |
| 91 | { |
| 92 | struct group *gr, *getgrnam(); |
| 93 | |
| 94 | if (!*s) { |
| 95 | gid = -1; /* argument was "uid." */ |
| 96 | return; |
| 97 | } |
| 98 | for (gname = s; *s && isdigit(*s); ++s); |
| 99 | if (!*s) |
| 100 | gid = atoi(gname); |
| 101 | else { |
| 102 | if (!(gr = getgrnam(gname))) { |
| 103 | if (fflag) |
| 104 | exit(0); |
| 105 | (void)fprintf(stderr, "%s: unknown group id: %s\n", |
| 106 | myname, gname); |
| 107 | exit(-1); |
| 108 | } |
| 109 | gid = gr->gr_gid; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | setuid(s) |
| 114 | register char *s; |
| 115 | { |
| 116 | struct passwd *pwd, *getpwnam(); |
| 117 | char *beg; |
| 118 | |
| 119 | if (!*s) { |
| 120 | uid = -1; /* argument was ".gid" */ |
| 121 | return; |
| 122 | } |
| 123 | for (beg = s; *s && isdigit(*s); ++s); |
| 124 | if (!*s) |
| 125 | uid = atoi(beg); |
| 126 | else { |
| 127 | if (!(pwd = getpwnam(beg))) { |
| 128 | if (fflag) |
| 129 | exit(0); |
| 130 | (void)fprintf(stderr, |
| 131 | "chown: unknown user id: %s\n", beg); |
| 132 | exit(-1); |
| 133 | } |
| 134 | uid = pwd->pw_uid; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | change(file) |
| 139 | char *file; |
| 140 | { |
| 141 | register DIR *dirp; |
| 142 | register struct dirent *dp; |
| 143 | struct stat buf; |
| 144 | |
| 145 | if (chown(file, uid, gid)) { |
| 146 | chownerr(file); |
| 147 | return; |
| 148 | } |
| 149 | if (!rflag) |
| 150 | return; |
| 151 | if (lstat(file, &buf)) { |
| 152 | err(file); |
| 153 | return; |
| 154 | } |
| 155 | if ((buf.st_mode & S_IFMT) == S_IFDIR) { |
| 156 | if (chdir(file) < 0 || !(dirp = opendir("."))) { |
| 157 | err(file); |
| 158 | return; |
| 159 | } |
| 160 | for (dp = readdir(dirp); dp; dp = readdir(dirp)) { |
| 161 | if (dp->d_name[0] == '.' && (!dp->d_name[1] || |
| 162 | dp->d_name[1] == '.' && !dp->d_name[2])) |
| 163 | continue; |
| 164 | change(dp->d_name); |
| 165 | } |
| 166 | closedir(dirp); |
| 167 | if (chdir("..")) { |
| 168 | err(".."); |
| 169 | exit(fflag ? 0 : -1); |
| 170 | } |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | chownerr(file) |
| 175 | char *file; |
| 176 | { |
| 177 | extern int errno; |
| 178 | static int euid = -1, ngroups = -1; |
| 179 | |
| 180 | /* check for chown without being root */ |
| 181 | if (errno != EPERM || uid != -1 && euid == -1 && (euid = geteuid())) { |
| 182 | if (fflag) |
| 183 | exit(0); |
| 184 | err(file); |
| 185 | exit(-1); |
| 186 | } |
| 187 | /* check group membership; kernel just returns EPERM */ |
| 188 | if (gid != -1 && ngroups == -1) { |
| 189 | int groups[NGROUPS]; |
| 190 | |
| 191 | ngroups = getgroups(NGROUPS, groups); |
| 192 | while (--ngroups >= 0 && gid != groups[ngroups]); |
| 193 | if (ngroups < 0) { |
| 194 | if (fflag) |
| 195 | exit(0); |
| 196 | (void)fprintf(stderr, |
| 197 | "%s: you are not a member of group %s.\n", |
| 198 | myname, gname); |
| 199 | exit(-1); |
| 200 | } |
| 201 | } |
| 202 | err(file); |
| 203 | } |
| 204 | |
| 205 | err(s) |
| 206 | char *s; |
| 207 | { |
| 208 | extern int errno; |
| 209 | char *strerror(); |
| 210 | |
| 211 | if (fflag) |
| 212 | return; |
| 213 | (void)fprintf(stderr, "%s: %s: %s\n", myname, s, strerror(errno)); |
| 214 | retval = -1; |
| 215 | } |
| 216 | |
| 217 | usage() |
| 218 | { |
| 219 | (void)fprintf(stderr, "usage: %s [-Rf] %s file ...\n", myname, |
| 220 | ischown ? "owner[.group]" : "group"); |
| 221 | exit(-1); |
| 222 | } |