release/src/router/busybox/coreutils/install.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2003 by Glenn McGrath
   4  * SELinux support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
   5  *
   6  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   7  */
   8
   9 /* -v, -b, -c are ignored */
  10 //usage:#define install_trivial_usage
  11 //usage:        "[-cdDsp] [-o USER] [-g GRP] [-m MODE] [SOURCE]... DEST"
  12 //usage:#define install_full_usage "\n\n"
  13 //usage:       "Copy files and set attributes\n"
  14 //usage:     "\n        -c      Just copy (default)"
  15 //usage:     "\n        -d      Create directories"
  16 //usage:     "\n        -D      Create leading target directories"
  17 //usage:     "\n        -s      Strip symbol table"
  18 //usage:     "\n        -p      Preserve date"
  19 //usage:     "\n        -o USER Set ownership"
  20 //usage:     "\n        -g GRP  Set group ownership"
  21 //usage:     "\n        -m MODE Set permissions"
  22 //usage:        IF_SELINUX(
  23 //usage:     "\n        -Z      Set security context"
  24 //usage:        )
  25
  26 #include "libbb.h"
  27 #include "libcoreutils/coreutils.h"
  28
  29 #if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
  30 static const char install_longopts[] ALIGN1 =
  31         "directory\0"           No_argument       "d"
  32         "preserve-timestamps\0" No_argument       "p"
  33         "strip\0"               No_argument       "s"
  34         "group\0"               Required_argument "g"
  35         "mode\0"                Required_argument "m"
  36         "owner\0"               Required_argument "o"
  37 /* autofs build insists of using -b --suffix=.orig */
  38 /* TODO? (short option for --suffix is -S) */
  39 #if ENABLE_SELINUX
  40         "context\0"             Required_argument "Z"
  41         "preserve_context\0"    No_argument       "\xff"
  42         "preserve-context\0"    No_argument       "\xff"
  43 #endif
  44         ;
  45 #endif
  46
  47
  48 #if ENABLE_SELINUX
  49 static void setdefaultfilecon(const char *path)
  50 {
  51         struct stat s;
  52         security_context_t scontext = NULL;
  53
  54         if (!is_selinux_enabled()) {
  55                 return;
  56         }
  57         if (lstat(path, &s) != 0) {
  58                 return;
  59         }
  60
  61         if (matchpathcon(path, s.st_mode, &scontext) < 0) {
  62                 goto out;
  63         }
  64         if (strcmp(scontext, "<<none>>") == 0) {
  65                 goto out;
  66         }
  67
  68         if (lsetfilecon(path, scontext) < 0) {
  69                 if (errno != ENOTSUP) {
  70                         bb_perror_msg("warning: can't change context"
  71                                         " of %s to %s", path, scontext);
  72                 }
  73         }
  74
  75  out:
  76         freecon(scontext);
  77 }
  78
  79 #endif
  80
  81 int install_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  82 int install_main(int argc, char **argv)
  83 {
  84         struct stat statbuf;
  85         mode_t mode;
  86         uid_t uid;
  87         gid_t gid;
  88         char *arg, *last;
  89         const char *gid_str;
  90         const char *uid_str;
  91         const char *mode_str;
  92         int copy_flags = FILEUTILS_DEREFERENCE | FILEUTILS_FORCE;
  93         int opts;
  94         int min_args = 1;
  95         int ret = EXIT_SUCCESS;
  96         int isdir = 0;
  97 #if ENABLE_SELINUX
  98         security_context_t scontext;
  99         bool use_default_selinux_context = 1;
 100 #endif
 101         enum {
 102                 OPT_c             = 1 << 0,
 103                 OPT_v             = 1 << 1,
 104                 OPT_b             = 1 << 2,
 105                 OPT_MKDIR_LEADING = 1 << 3,
 106                 OPT_DIRECTORY     = 1 << 4,
 107                 OPT_PRESERVE_TIME = 1 << 5,
 108                 OPT_STRIP         = 1 << 6,
 109                 OPT_GROUP         = 1 << 7,
 110                 OPT_MODE          = 1 << 8,
 111                 OPT_OWNER         = 1 << 9,
 112 #if ENABLE_SELINUX
 113                 OPT_SET_SECURITY_CONTEXT = 1 << 10,
 114                 OPT_PRESERVE_SECURITY_CONTEXT = 1 << 11,
 115 #endif
 116         };
 117
 118 #if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
 119         applet_long_options = install_longopts;
 120 #endif
 121         opt_complementary = "s--d:d--s" IF_FEATURE_INSTALL_LONG_OPTIONS(IF_SELINUX(":Z--\xff:\xff--Z"));
 122         /* -c exists for backwards compatibility, it's needed */
 123         /* -v is ignored ("print name of each created directory") */
 124         /* -b is ignored ("make a backup of each existing destination file") */
 125         opts = getopt32(argv, "cvb" "Ddpsg:m:o:" IF_SELINUX("Z:"),
 126                         &gid_str, &mode_str, &uid_str IF_SELINUX(, &scontext));
 127         argc -= optind;
 128         argv += optind;
 129
 130 #if ENABLE_SELINUX
 131         if (opts & (OPT_PRESERVE_SECURITY_CONTEXT|OPT_SET_SECURITY_CONTEXT)) {
 132                 selinux_or_die();
 133                 use_default_selinux_context = 0;
 134                 if (opts & OPT_PRESERVE_SECURITY_CONTEXT) {
 135                         copy_flags |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 136                 }
 137                 if (opts & OPT_SET_SECURITY_CONTEXT) {
 138                         setfscreatecon_or_die(scontext);
 139                         copy_flags |= FILEUTILS_SET_SECURITY_CONTEXT;
 140                 }
 141         }
 142 #endif
 143
 144         /* preserve access and modification time, this is GNU behaviour,
 145          * BSD only preserves modification time */
 146         if (opts & OPT_PRESERVE_TIME) {
 147                 copy_flags |= FILEUTILS_PRESERVE_STATUS;
 148         }
 149         mode = 0755; /* GNU coreutils 6.10 compat */
 150         if (opts & OPT_MODE)
 151                 bb_parse_mode(mode_str, &mode);
 152         uid = (opts & OPT_OWNER) ? get_ug_id(uid_str, xuname2uid) : getuid();
 153         gid = (opts & OPT_GROUP) ? get_ug_id(gid_str, xgroup2gid) : getgid();
 154
 155         last = argv[argc - 1];
 156         if (!(opts & OPT_DIRECTORY)) {
 157                 argv[argc - 1] = NULL;
 158                 min_args++;
 159
 160                 /* coreutils install resolves link in this case, don't use lstat */
 161                 isdir = stat(last, &statbuf) < 0 ? 0 : S_ISDIR(statbuf.st_mode);
 162         }
 163
 164         if (argc < min_args)
 165                 bb_show_usage();
 166
 167         while ((arg = *argv++) != NULL) {
 168                 char *dest = last;
 169                 if (opts & OPT_DIRECTORY) {
 170                         dest = arg;
 171                         /* GNU coreutils 6.9 does not set uid:gid
 172                          * on intermediate created directories
 173                          * (only on last one) */
 174                         if (bb_make_directory(dest, 0755, FILEUTILS_RECUR)) {
 175                                 ret = EXIT_FAILURE;
 176                                 goto next;
 177                         }
 178                 } else {
 179                         if (opts & OPT_MKDIR_LEADING) {
 180                                 char *ddir = xstrdup(dest);
 181                                 bb_make_directory(dirname(ddir), 0755, FILEUTILS_RECUR);
 182                                 /* errors are not checked. copy_file
 183                                  * will fail if dir is not created. */
 184                                 free(ddir);
 185                         }
 186                         if (isdir)
 187                                 dest = concat_path_file(last, bb_basename(arg));
 188                         if (copy_file(arg, dest, copy_flags) != 0) {
 189                                 /* copy is not made */
 190                                 ret = EXIT_FAILURE;
 191                                 goto next;
 192                         }
 193                         if (opts & OPT_STRIP) {
 194                                 char *args[4];
 195                                 args[0] = (char*)"strip";
 196                                 args[1] = (char*)"-p"; /* -p --preserve-dates */
 197                                 args[2] = dest;
 198                                 args[3] = NULL;
 199                                 if (spawn_and_wait(args)) {
 200                                         bb_perror_msg("strip");
 201                                         ret = EXIT_FAILURE;
 202                                 }
 203                         }
 204                 }
 205
 206                 /* Set the file mode (always, not only with -m).
 207                  * GNU coreutils 6.10 is not affected by umask. */
 208                 if (chmod(dest, mode) == -1) {
 209                         bb_perror_msg("can't change %s of %s", "permissions", dest);
 210                         ret = EXIT_FAILURE;
 211                 }
 212 #if ENABLE_SELINUX
 213                 if (use_default_selinux_context)
 214                         setdefaultfilecon(dest);
 215 #endif
 216                 /* Set the user and group id */
 217                 if ((opts & (OPT_OWNER|OPT_GROUP))
 218                  && lchown(dest, uid, gid) == -1
 219                 ) {
 220                         bb_perror_msg("can't change %s of %s", "ownership", dest);
 221                         ret = EXIT_FAILURE;
 222                 }
 223  next:
 224                 if (ENABLE_FEATURE_CLEAN_UP && isdir)
 225                         free(dest);
 226         }
 227
 228         return ret;
 229 }