mono/mini/main.c

   1 /**
   2  * \file
   3  * The main entry point for the mono executable
   4  *
   5  * The main entry point does a few things:
   6  *
   7  *   * It probes whether the executable has a bundle appended
   8  *     at the end, and if so, registers the various bundled
   9  *     resources with Mono and executes the contained bundle
  10  *
  11  *   * Parses the MONO_ENV_OPTIONS variable to treat the
  12  *     contents of the variable as command line arguments for
  13  *     the mono runtime
  14  *
  15  *   * Launches Mono, by calling mono_main.
  16  */
  17 #include <config.h>
  18 #include <fcntl.h>
  19 #ifndef HOST_WIN32
  20 #include <dirent.h>
  21 #endif
  22 #include <mono/metadata/assembly.h>
  23 #include <mono/metadata/mono-config.h>
  24 #include <mono/utils/mono-mmap.h>
  25 #include "mini.h"
  26 #include "mini-runtime.h"
  27
  28 #ifdef HAVE_UNISTD_H
  29 #  include <unistd.h>
  30 #endif
  31 #ifdef HOST_WIN32
  32 #  include <io.h>
  33 #else
  34 #  ifndef BUILDVER_INCLUDED
  35 #    include "buildver-boehm.h"
  36 #  endif
  37 #endif
  38
  39 //#define TEST_ICALL_SYMBOL_MAP 1
  40
  41 /*
  42  * If the MONO_ENV_OPTIONS environment variable is set, it uses this as a
  43  * source of command line arguments that are passed to Mono before the
  44  * command line arguments specified in the command line.
  45  */
  46 static int
  47 mono_main_with_options (int argc, char *argv [])
  48 {
  49         mono_parse_env_options (&argc, &argv);
  50
  51         return mono_main (argc, argv);
  52 }
  53
  54 /*
  55  * The Mono executable can initialize itself from a payload attached
  56  * at the end of the main program.   The payload contains the
  57  * main assembly, one or more managed assemblies, configuration
  58  * files and other assets that are used instead of launching a
  59  * program from the command line.
  60  *
  61  * The startup sequence probes for a magical signature at the end of
  62  * the executable, if the 16 characters "xmonkeysloveplay" are found,
  63  * the code expects the 64-bits just before it to contain an offset
  64  * within the executable with a directory of assets.
  65  *
  66  * All pointers in the file format are encoded as little-endian values
  67  *
  68  * The format of the file is thus:
  69  *
  70  * Location        Content
  71  * --------        -------
  72  * lenght-16       Optional "xmonkeysloveplay", indicating that a
  73  *                 bundled payload is contained in the executable.
  74  * length-24       pointer to the directory in the file, address DIR
  75  *
  76  * DIR             32-bit value with the number of entries in the directory
  77  * DIR+4           First directory entry.
  78  *
  79  * Each directory entry is made up of:
  80  * 4-bytes         uint32_t containing the size of a string (STR)
  81  * STRING          UTF8 encoded and \0 terminated string
  82  * 8-bytes         uint64_t offset in the file with the payload associated with STRING
  83  * 4-bytes         uint32_t size of the asset
  84  *
  85  * The following are the known directory entries, without the quotes:
  86  * "assembly:NAME"  An assembly with the name NAME, assembly is in the payload
  87  * "config:NAME"    A configuration file (usually file.dll.config) in the payload that is
  88  *                  loaded as the config file for an assembly
  89  * "systemconfig:"  Treats as a Mono system configuration, payload contains the config file.
  90  * "options:"       The payload contains command line options to initialize Mono, as if you
  91                     had set them on MONO_ENV_OPTIONS
  92  * "config_dir:DIR" Configures the MONO_PATH to point to point to DIR
  93  * "machineconfig:" The payload contains the machine.config file to use at runtime
  94  * "env:"           Sets the environment variable to the value encoded in the payload
  95  *                  payload contains: 1-byte lenght for the \0 terminated variable,
  96  *                  followed by the value.
  97  * "library:NAME"   Bundled dynamic library NAME, payload contains the dynamic library
  98  */
  99 #define STREAM_INT(x) GUINT32_TO_LE((*(uint32_t*)x))
 100 #define STREAM_LONG(x) GUINT64_TO_LE((*(uint64_t*)x))
 101
 102 #ifndef HOST_WIN32
 103 static gboolean
 104 search_directories(const char *envPath, const char *program, char **new_program)
 105 {
 106         gchar **paths = NULL;
 107         gint i;
 108
 109         paths = g_strsplit (envPath, G_SEARCHPATH_SEPARATOR_S, 0);
 110         g_assert (paths);
 111
 112         for (i = 0; paths [i]; ++i) {
 113                 gchar *path = paths [i];
 114                 gint path_len = strlen (path);
 115                 DIR *dir;
 116                 struct dirent *ent;
 117
 118                 if (path_len == 0)
 119                         continue;
 120
 121                 dir = opendir (path);
 122                 if (!dir)
 123                         continue;
 124
 125                 while ((ent = readdir (dir))){
 126                         if (!strcmp (ent->d_name, program)){
 127                                 *new_program = g_strdup_printf ("%s%s%s", path, path [path_len - 1] == '/' ? "" : "/", program);
 128                                 closedir (dir);
 129                                 g_strfreev (paths);
 130                                 return TRUE;
 131                         }
 132                 }
 133
 134                 closedir (dir);
 135         }
 136
 137         *new_program = NULL;
 138         g_strfreev (paths);
 139         return FALSE;
 140 }
 141 #endif
 142
 143 static gboolean
 144 probe_embedded (const char *program, int *ref_argc, char **ref_argv [])
 145 {
 146         MonoBundledAssembly last = { NULL, 0, 0 };
 147         char sigbuffer [16+sizeof (uint64_t)];
 148         gboolean status = FALSE;
 149         uint64_t directory_location;
 150         off_t sigstart, baseline = 0;
 151         uint64_t directory_size;
 152         char *directory, *p;
 153         int items, i;
 154         unsigned char *mapaddress = NULL;
 155         void *maphandle = NULL;
 156         GArray *assemblies;
 157         char *entry_point = NULL;
 158         char **new_argv;
 159         int j;
 160
 161         int fd = open (program, O_RDONLY);
 162 #ifndef HOST_WIN32
 163         if (fd == -1){
 164                 // Also search through the PATH in case the program was run from a different directory
 165                 gchar* envPath = getenv ("PATH");
 166                 if (envPath){
 167                         gchar *new_program = NULL;
 168                         if (search_directories (envPath, program, &new_program)){
 169                                 fd = open (new_program, O_RDONLY);
 170                                 g_free (new_program);
 171                                 new_program = NULL;
 172                         }
 173                 }
 174         }
 175 #endif
 176         if (fd == -1)
 177                 return FALSE;
 178         if ((sigstart = lseek (fd, -24, SEEK_END)) == -1)
 179                 goto doclose;
 180         if (read (fd, sigbuffer, sizeof (sigbuffer)) == -1)
 181                 goto doclose;
 182         if (memcmp (sigbuffer+sizeof(uint64_t), "xmonkeysloveplay", 16) != 0)
 183                 goto doclose;
 184         directory_location = GUINT64_FROM_LE ((*(uint64_t *) &sigbuffer [0]));
 185         if (lseek (fd, directory_location, SEEK_SET) == -1)
 186                 goto doclose;
 187         directory_size = sigstart-directory_location;
 188         directory = g_malloc (directory_size);
 189         if (directory == NULL)
 190                 goto doclose;
 191         if (read (fd, directory, directory_size) == -1)
 192                 goto dofree;
 193
 194         items = STREAM_INT (directory);
 195         p = directory+4;
 196
 197         assemblies = g_array_new (0, 0, sizeof (MonoBundledAssembly*));
 198         for (i = 0; i < items; i++){
 199                 char *kind;
 200                 int strsize = STREAM_INT (p);
 201                 uint64_t offset;
 202                 uint32_t item_size;
 203                 kind = p+4;
 204                 p += 4 + strsize;
 205                 offset = STREAM_LONG(p);
 206                 p += 8;
 207                 item_size = STREAM_INT (p);
 208                 p += 4;
 209
 210                 if (mapaddress == NULL) {
 211                         char *error_message = NULL;
 212                         mapaddress = (guchar*)mono_file_map_error (directory_location - offset, MONO_MMAP_READ | MONO_MMAP_PRIVATE,
 213                                 fd, offset, &maphandle, program, &error_message);
 214                         if (mapaddress == NULL) {
 215                                 if (error_message)
 216                                         fprintf (stderr, "Error mapping file: %s\n", error_message);
 217                                 else
 218                                         perror ("Error mapping file");
 219                                 exit (1);
 220                         }
 221                         baseline = offset;
 222                 }
 223                 if (strncmp (kind, "assembly:", strlen ("assembly:")) == 0){
 224                         char *aname = kind + strlen ("assembly:");
 225                         MonoBundledAssembly mba = { aname, mapaddress + offset - baseline, item_size }, *ptr;
 226                         ptr = g_new (MonoBundledAssembly, 1);
 227                         memcpy (ptr, &mba, sizeof (MonoBundledAssembly));
 228                         g_array_append_val  (assemblies, ptr);
 229                         if (entry_point == NULL)
 230                                 entry_point = aname;
 231                 } else if (strncmp (kind, "config:", strlen ("config:")) == 0){
 232                         char *config = kind + strlen ("config:");
 233                         char *aname = g_strdup (config);
 234                         aname [strlen(aname)-strlen(".config")] = 0;
 235                         mono_register_config_for_assembly (aname, g_str_from_file_region (fd, offset, item_size));
 236                 } else if (strncmp (kind, "systemconfig:", strlen ("systemconfig:")) == 0){
 237                         mono_config_parse_memory (g_str_from_file_region (fd, offset, item_size));
 238                 } else if (strncmp (kind, "options:", strlen ("options:")) == 0){
 239                         mono_parse_options_from (g_str_from_file_region (fd, offset, item_size), ref_argc, ref_argv);
 240                 } else if (strncmp (kind, "config_dir:", strlen ("config_dir:")) == 0){
 241                         char *mono_path_value = g_getenv ("MONO_PATH");
 242                         mono_set_dirs (mono_path_value, g_str_from_file_region (fd, offset, item_size));
 243                         g_free (mono_path_value);
 244                 } else if (strncmp (kind, "machineconfig:", strlen ("machineconfig:")) == 0) {
 245                         mono_register_machine_config (g_str_from_file_region (fd, offset, item_size));
 246                 } else if (strncmp (kind, "env:", strlen ("env:")) == 0){
 247                         char *data = g_str_from_file_region (fd, offset, item_size);
 248                         uint8_t count = *data++;
 249                         char *value = data + count + 1;
 250                         g_setenv (data, value, FALSE);
 251                 } else if (strncmp (kind, "library:", strlen ("library:")) == 0){
 252                         mono_loader_save_bundled_library (fd, offset, item_size, kind + strlen ("library:"));
 253                 } else {
 254                         fprintf (stderr, "Unknown stream on embedded package: %s\n", kind);
 255                         exit (1);
 256                 }
 257         }
 258         g_array_append_val (assemblies, last);
 259
 260         mono_register_bundled_assemblies ((const MonoBundledAssembly **) assemblies->data);
 261         new_argv = g_new (char *, (*ref_argc)+1);
 262         new_argv [0] = (*ref_argv)[0];
 263         new_argv [1] = entry_point;
 264         for (j = 1; j < *ref_argc; j++)
 265                 new_argv [j+1] = (*ref_argv)[j];
 266         *ref_argv = new_argv;
 267         (*ref_argc)++;
 268
 269         return TRUE;
 270
 271 dofree:
 272         g_free (directory);
 273 doclose:
 274         if (!status)
 275                 close (fd);
 276         return status;
 277 }
 278
 279 #if TEST_ICALL_SYMBOL_MAP
 280
 281 const char*
 282 mono_lookup_icall_symbol_internal (gpointer func);
 283
 284 ICALL_EXPORT int ves_icall_Interop_Sys_DoubleToString (double, char*, char*, int);
 285
 286 #endif
 287
 288 #ifdef HOST_WIN32
 289
 290 #include <shellapi.h>
 291
 292 #ifdef _WINDOWS
 293 int APIENTRY
 294 wWinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)
 295 #else
 296 int
 297 main (int _argc, char* _argv[])
 298 #endif
 299 {
 300         gunichar2 *module_file_name;
 301         guint32 length;
 302         int argc;
 303         gunichar2** argvw;
 304         gchar** argv;
 305         int i;
 306
 307         argvw = CommandLineToArgvW (GetCommandLineW (), &argc);
 308         argv = g_new0 (gchar*, argc + 1);
 309         for (i = 0; i < argc; i++)
 310                 argv [i] = g_utf16_to_utf8 (argvw [i], -1, NULL, NULL, NULL);
 311         argv [argc] = NULL;
 312
 313         LocalFree (argvw);
 314
 315         if (mono_get_module_filename (NULL, &module_file_name, &length)) {
 316                 char *entry = g_utf16_to_utf8 (module_file_name, length, NULL, NULL, NULL);
 317                 g_free (module_file_name);
 318                 probe_embedded (entry, &argc, &argv);
 319         }
 320
 321         return mono_main_with_options  (argc, argv);
 322 }
 323
 324 #else
 325
 326 int
 327 main (int argc, char* argv[])
 328 {
 329         mono_build_date = build_date;
 330
 331 #if TEST_ICALL_SYMBOL_MAP
 332         const char *p  = mono_lookup_icall_symbol_internal (mono_lookup_icall_symbol_internal);
 333         printf ("%s\n", p ? p : "null");
 334         p  = mono_lookup_icall_symbol_internal (ves_icall_Interop_Sys_DoubleToString);
 335         printf ("%s\n", p ? p : "null");
 336 #endif
 337
 338         probe_embedded (argv [0], &argc, &argv);
 339         return mono_main_with_options (argc, argv);
 340 }
 341
 342 #endif