applets/busybox.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * BusyBox' main applet dispatcher.
   4  *
   5  * Licensed under GPLv2, see file LICENSE in this tarball for details.
   6  */
   7 #include "busybox.h"
   8
   9 const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
  10
  11 #ifdef CONFIG_FEATURE_INSTALLER
  12 /*
  13  * directory table
  14  *              this should be consistent w/ the enum, busybox.h::Location,
  15  *              or else...
  16  */
  17 static const char usr_bin [] = "/usr/bin";
  18 static const char usr_sbin[] = "/usr/sbin";
  19
  20 static const char* const install_dir[] = {
  21         &usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
  22         &usr_bin [4], /* "/bin" */
  23         &usr_sbin[4], /* "/sbin" */
  24         usr_bin,
  25         usr_sbin
  26 };
  27
  28 /* abstract link() */
  29 typedef int (*link_func)(const char *, const char *);
  30
  31 /* create (sym)links for each applet */
  32 static void install_links(const char *busybox, int use_symbolic_links)
  33 {
  34         link_func lf = link;
  35         char *fpc;
  36         int i;
  37         int rc;
  38
  39         if (use_symbolic_links)
  40                 lf = symlink;
  41
  42         for (i = 0; applets[i].name != NULL; i++) {
  43                 fpc = concat_path_file(
  44                                 install_dir[applets[i].location],
  45                                 applets[i].name);
  46                 rc = lf(busybox, fpc);
  47                 if (rc != 0 && errno != EEXIST) {
  48                         bb_perror_msg("%s", fpc);
  49                 }
  50                 free(fpc);
  51         }
  52 }
  53
  54 #else
  55 #define install_links(x,y)
  56 #endif /* CONFIG_FEATURE_INSTALLER */
  57
  58 int main(int argc, char **argv)
  59 {
  60         const char *s;
  61
  62         applet_name = argv[0];
  63         if (*applet_name == '-')
  64                 applet_name++;
  65         while ((s = strchr(applet_name, '/')))
  66                 applet_name = s + 1;
  67
  68         /* Set locale for everybody except 'init' */
  69         if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
  70                 setlocale(LC_ALL, "");
  71
  72         run_applet_by_name(applet_name, argc, argv);
  73         bb_error_msg_and_die("applet not found");
  74 }
  75
  76 int busybox_main(int argc, char **argv)
  77 {
  78         /*
  79          * This style of argument parsing doesn't scale well
  80          * in the event that busybox starts wanting more --options.
  81          * If someone has a cleaner approach, by all means implement it.
  82          */
  83         if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
  84                 int use_symbolic_links = 0;
  85                 char *busybox;
  86
  87                 /* to use symlinks, or not to use symlinks... */
  88                 if (argc > 2)
  89                         if (strcmp(argv[2], "-s") == 0)
  90                                 use_symbolic_links = 1;
  91
  92                 /* link */
  93 // XXX: FIXME: this is broken. Why not just use argv[0] ?
  94                 busybox = xreadlink("/proc/self/exe");
  95                 if (!busybox)
  96                         return 1;
  97                 install_links(busybox, use_symbolic_links);
  98                 if (ENABLE_FEATURE_CLEAN_UP)
  99                         free(busybox);
 100                 return 0;
 101         }
 102
 103         /* Deal with --help.  (Also print help when called with no arguments) */
 104
 105         if (argc == 1 || !strcmp(argv[1], "--help") ) {
 106                 if (argc > 2) {
 107                         applet_name = argv[2];
 108                         run_applet_by_name(applet_name, 2, argv);
 109                 } else {
 110                         const struct BB_applet *a;
 111                         int col, output_width;
 112
 113                         output_width = 80 - sizeof("start-stop-daemon, ") - 8;
 114                         if (ENABLE_FEATURE_AUTOWIDTH) {
 115                                 /* Obtain the terminal width.  */
 116                                 get_terminal_width_height(0, &output_width, NULL);
 117                                 /* leading tab and room to wrap */
 118                                 output_width -= sizeof("start-stop-daemon, ") + 8;
 119                         }
 120
 121                         printf("%s\n"
 122                                "Copyright (C) 1998-2006  Erik Andersen, Rob Landley, and others.\n"
 123                                "Licensed under GPLv2.  See source distribution for full notice.\n\n"
 124                                "Usage: busybox [function] [arguments]...\n"
 125                                "   or: [function] [arguments]...\n\n"
 126                                "\tBusyBox is a multi-call binary that combines many common Unix\n"
 127                                "\tutilities into a single executable.  Most people will create a\n"
 128                                "\tlink to busybox for each function they wish to use and BusyBox\n"
 129                                "\twill act like whatever it was invoked as!\n"
 130                                "\nCurrently defined functions:\n", bb_msg_full_version);
 131                         col = 0;
 132                         for (a = applets; a->name;) {
 133                                 col += printf("%s%s", (col ? ", " : "\t"), a->name);
 134                                 a++;
 135                                 if (col > output_width && a->name) {
 136                                         puts(",");
 137                                         col = 0;
 138                                 }
 139                         }
 140                         puts("\n");
 141                         return 0;
 142                 }
 143         } else run_applet_by_name(argv[1], argc - 1, argv + 1);
 144
 145         bb_error_msg_and_die("applet not found");
 146 }