Urlader/urlader.c

#ifndef URLADER
# define URLADER "urlader"
#endif
#define URLADER_VERSION "1.0"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>

#include "liblzf/lzf_d.c"

#define TAIL_MAGIC "SCHMORPPACK0"

#ifdef _WIN32

   #include <windows.h>
   //#include <winbase.h>
   #include <shlobj.h>
   #include <shlwapi.h>
   #include <wininet.h>

   static DWORD dword;

   #define u_handle HANDLE
   #define u_setenv(name,value) SetEnvironmentVariable (name, value)
   #define u_mkdir(path) !CreateDirectory (path, NULL)
   #define u_chdir(path) !SetCurrentDirectory (path)
   #define u_rename(fr,to) !MoveFile (fr, to)
   #define u_open(path) CreateFile (path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL)
   #define u_creat(path,exec) CreateFile (path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL)
   #define u_close(handle) CloseHandle (handle)
   #define u_append(path,add) PathAppend (path, add)
   #define u_write(handle,data,len) (WriteFile (handle, data, len, &dword, 0) ? dword : -1)
   #define u_sync() // use transacted I/O?

#else

   #include <sys/mman.h>
   #include <sys/types.h>
   #include <pwd.h>

   #ifdef PATH_MAX
     #define MAX_PATH (PATH_MAX < 4096 ? 4096 : PATH_MAX)
   #else
     #define MAX_PATH 4096
   #endif

   #define u_handle int
   #define u_setenv(name,value) setenv (name, value, 1)
   #define u_mkdir(path) mkdir (path, 0777)
   #define u_chdir(path) chdir (path)
   #define u_rename(fr,to) rename (fr, to)
   #define u_open(path) open (path, O_RDONLY) + 1
   #define u_creat(path,exec) open (path, O_WRONLY | O_CREAT | O_TRUNC, (exec) ? 0777 : 0666) + 1
   #define u_close(handle) close (handle - 1)
   #define u_append(path,add) strcat (strcat (path, "/"), add)
   #define u_write(handle,data,len) write ((handle) - 1, data, len)
   #define u_sync() sync ()

#endif

#define u_16(ptr) (((ptr)[0] << 8) | (ptr)[1])
#define u_32(ptr) (((ptr)[0] << 24) | ((ptr)[1] << 16) | ((ptr)[2] << 8) | (ptr)[3])

static u_handle pack_handle;
static char tmppath[MAX_PATH];
static char currdir[MAX_PATH];
static char datadir[MAX_PATH];  // %AppData%/urlader
static char exe_dir[MAX_PATH];  // %AppData%/urlader/EXE_ID
static char execdir[MAX_PATH];  // %AppData%/urlader/EXE_ID/EXE_VER
static char exe_id[MAX_PATH];
static char exe_ver[MAX_PATH];

static int exe_argc;
static const char *exe_argv[32];

static void
fatal (const char *msg)
{
#ifdef _WIN32
  MessageBox (0, msg, URLADER, 0);
#else
  fprintf (stderr, "%s: %s\n", URLADER, msg);
#endif

  _exit (1);
}

static void
tmpdir (const char *dir)
{
  static int cnt;

  for (;;)
    {
//      #ifdef _WIN32
//        sprintf (tmppath, "%s/%x_%x.tmp", dir, (unsigned int)GetCurrentProcessId (), ++cnt);
//      #else
        sprintf (tmppath, "%s/t-%x_%x.tmp", dir, (unsigned int)getpid ()             , ++cnt);
//      #endif

      if (!u_mkdir (tmppath))
        return;
    }
}

static void
systemv (const char *const argv[], int dowait)
{
#ifdef _WIN32
  _spawnv (P_WAIT, argv [0], argv);
#else
  pid_t pid = dowait ? fork () : 0;

  if (pid < 0)
    fatal ("fork failure");

  if (!pid)
    {
      execv (argv [0], (void *)argv);
      _exit (124);
    }

  int status;
  waitpid (pid, &status, 0);
#endif
}

static void
deltree (const char *path)
{
  #ifdef _WIN32
    char buf[MAX_PATH * 2 + 64];
    const char *argv[] = { getenv ("COMSPEC"), "/c", "rd", "/s", "/q", buf, 0 };
    sprintf (buf, "\"%s\"", path);
  #else
    const char *argv[] = { "/bin/rm", "-rf", path, 0 };
  #endif
  systemv (argv, 1);
}

enum
{
  T_NULL, // 5
  T_META, // 1 : exe_id, exe_ver
  T_ARG,  // 2 : arg
  T_ENV,  // 3 : name, value
  T_DIR,  // 4+: path
  T_FILE, // 4+: path, data
  T_NUM
};

enum
{
  F_EXEC = 1,
  F_LZF  = 2,
  F_NULL = 0
};

struct hdr
{
  unsigned char type;
  unsigned char flags;
  unsigned char namelen[2];
  unsigned char datalen[4];
};

struct tail {
  unsigned char max_filesize[4];
  unsigned char size[4];
  char magic[12];
};

static char *pack_base, *pack_end;
static struct hdr *pack_cur;
static char *scratch;
static unsigned int scratch_len;

#define PACK_NAME ((char *)(pack_cur + 1))
#define PACK_DATA (PACK_NAME + u_16 (pack_cur->namelen) + 1)
#define PACK_VALID pack_cur->type

static void
pack_next (void)
{
  unsigned int d = u_32 (pack_cur->datalen);

  pack_cur = (struct hdr *)(PACK_DATA + d);
}

static void
pack_unmap (void)
{
  if (!pack_base)
    return;

  free (scratch);

#ifdef _WIN32
  UnmapViewOfFile (pack_base);
#else
  munmap (pack_base, pack_end - pack_base);
#endif
}

static int
pack_map (void)
{
#ifdef _WIN32
  BY_HANDLE_FILE_INFORMATION fi;

  if (!GetFileInformationByHandle (pack_handle, &fi))
    return 0;

  if (fi.nFileSizeHigh) // too big
    return 0;

  HANDLE handle = CreateFileMapping (pack_handle, 0, PAGE_READONLY, 0, fi.nFileSizeLow, NULL);

  if (!handle)
    return 0;

  pack_unmap ();

  pack_base = MapViewOfFile (handle, FILE_MAP_READ, 0, 0, fi.nFileSizeLow);

  CloseHandle (handle);

  pack_end  = pack_base + fi.nFileSizeLow;
#else
  off_t len = lseek (pack_handle - 1, 0, SEEK_END);

  pack_unmap ();

  pack_base = mmap (0, len, PROT_READ, MAP_SHARED, pack_handle - 1, 0);
  if (pack_base == (void *)-1)
    pack_base = 0;

  pack_end = pack_base + len;
#endif

  if (!pack_base)
    return 0;

  struct tail *tail;

  tail = (void *)(pack_end - sizeof (*tail));

  if (memcmp (tail->magic, TAIL_MAGIC, sizeof (TAIL_MAGIC) - 1))
    return 0;

  pack_cur = (struct hdr *)(pack_end - u_32 (tail->size));

  free (scratch);
  scratch = malloc (scratch_len = u_32 (tail->max_filesize));

  return 1;
}

static void
exe_info (void)
{
  if (!pack_map ())
    fatal ("unable to locate packfile in executable - executable corrupted?");

  if (pack_cur->type != T_META)
    fatal ("unable to locate executable metadata - executable corrupted?");

  strcpy (exe_id, PACK_NAME);
}

static void
load (void)
{
  u_mkdir (datadir);

  strcpy (exe_dir, datadir);
  u_append (exe_dir, exe_id);
  u_mkdir (exe_dir);

  if (u_chdir (exe_dir))
    fatal ("unable to change to application data directory");

  u_handle h = u_open ("override");
  if (h)
    {
      u_handle oh = pack_handle;

      pack_handle = h;
      if (!pack_map ())
        {
          pack_handle = oh;
          oh = h;
        }

      u_close (oh);
    }

  if (pack_cur->type != T_META)
    fatal ("unable to locate override metadata");

  strcpy (exe_ver, PACK_DATA);
  pack_next ();

  while (pack_cur->type == T_ARG)
    {
      exe_argv [exe_argc++] = strdup (PACK_NAME);
      pack_next ();
    }

  while (pack_cur->type == T_ENV)
    {
      u_setenv (PACK_NAME, PACK_DATA);
      pack_next ();
    }

  strcpy (execdir, exe_dir);
  u_append (execdir, "i-");
  strcat (execdir, exe_ver);

  if (access (execdir, F_OK))
    {
      // does not exist yet, so unpack and move
      tmpdir (exe_dir);

      if (u_chdir (tmppath))
        fatal ("unable to change to new instance directory");

      for (;;)
        {
          switch (pack_cur->type)
            {
              case T_DIR:
                u_mkdir (PACK_NAME);
                break;

              case T_FILE:
                {
                  u_handle h = u_creat (PACK_NAME, pack_cur->flags & F_EXEC);
                  unsigned int dlen, len = u_32 (pack_cur->datalen);
                  char *data = PACK_DATA;

                  if (pack_cur->flags & F_LZF)
                    if (dlen = lzf_decompress (data, len, scratch, scratch_len))
                      {
                        data = scratch;
                        len  = dlen;
                      }
                    else
                      fatal ("unable to uncompress file data - pack corrupted?");

                  if (!h)
                    fatal ("unable to unpack file from packfile - disk full?");

                  if (u_write (h, data, len) != len)
                    fatal ("unable to unpack file from packfile - disk full?");

                  u_close (h);
                }
                break;

              case T_NULL:
                goto done;
            }

          pack_next ();
        }

done:
      if (u_chdir (datadir))
        fatal ("unable to change to data directory");

      u_sync ();

      if (u_rename (tmppath, execdir))
        deltree (tmppath); // if move fails, delete new, assume other process created it independently
    }

  pack_unmap ();
  u_close (pack_handle);

  if (u_chdir (execdir))
    fatal ("unable to change to application instance directory");

  u_setenv ("URLADER_VERSION", URLADER_VERSION);
  u_setenv ("URLADER_DATADIR", datadir);
  u_setenv ("URLADER_EXECDIR", execdir);
  u_setenv ("URLADER_EXE_ID" , exe_id);
  u_setenv ("URLADER_EXE_DIR", exe_dir);
  u_setenv ("URLADER_EXE_VER", exe_ver);

  // yes, this is overkill
  u_setenv ("SHLIB_PATH"        , execdir); // hpux
  u_setenv ("LIBPATH"           , execdir); // aix
  u_setenv ("LD_LIBRARY_PATH"   , execdir); // most elf systems
  u_setenv ("LD_LIBRARY_PATH_32", execdir); // solaris
  u_setenv ("LD_LIBRARY_PATH_64", execdir); // solaris
  u_setenv ("LD_LIBRARYN32_PATH", execdir); // irix
  u_setenv ("LD_LIBRARY64_PATH" , execdir); // irix
  u_setenv ("DYLD_LIBRARY_PATH" , execdir); // os sucks from apple
}

static void
execute (void)
{
  exe_argv [exe_argc] = 0;
  systemv (exe_argv, 0);
}

#ifdef _WIN32

int APIENTRY
WinMain (HINSTANCE hI, HINSTANCE hP, LPSTR argv, int command_show)
{
  if (!GetModuleFileName (hI, tmppath, sizeof (tmppath)))
    fatal ("unable to find executable pack");

  if (!(pack_handle = u_open (tmppath)))
    fatal ("unable to open executable pack");

  exe_info ();

  if (!GetCurrentDirectory (sizeof (currdir), currdir))
    strcpy (currdir, ".");

  if (SHGetFolderPath (0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, NULL, SHGFP_TYPE_CURRENT, datadir) != S_OK)
    fatal ("unable to find application data directory");

  u_mkdir (datadir);
  u_append (datadir, URLADER);

  load ();
  execute ();

  return 0;
}

#else

int
main (int argc, char *argv[])
{
  char *home = getenv ("HOME");

  // we assume fd 0 and 2 are "normal"

  if (!(pack_handle = u_open (argv [0])))
    fatal ("unable to open executable pack");

  exe_info ();

  if (!home)
    {
      struct passwd *pw;

      if ((pw = getpwuid (getuid ())))
        home = pw->pw_dir;
      else
        home = "/tmp";
    }

  if (!getcwd (currdir, sizeof (currdir)))
    strcpy (currdir, ".");

  u_mkdir (home);
  sprintf (datadir, "%s/.%s", home, URLADER);
  u_mkdir (datadir);

  if (gethostname (tmppath, sizeof (tmppath)))
    strcpy (tmppath, "default");

  u_append (datadir, tmppath);

  load ();
  execute ();

  return 0;
}

#endif

Revision:	1.3
Committed:	Thu Dec 29 10:39:34 2011 UTC (12 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+4 -0 lines
Log Message:	* empty log message *
#	Content
1	#ifndef URLADER
2	# define URLADER "urlader"
3	#endif
4	#define URLADER_VERSION "1.0"
5
6	#include <stdio.h>
7	#include <stdlib.h>
8	#include <unistd.h>
9	#include <errno.h>
10	#include <string.h>
11	#include <time.h>
12	#include <fcntl.h>
13
14	#include "liblzf/lzf_d.c"
15
16	#define TAIL_MAGIC "SCHMORPPACK0"
17
18	#ifdef _WIN32
19
20	#include <windows.h>
21	//#include <winbase.h>
22	#include <shlobj.h>
23	#include <shlwapi.h>
24	#include <wininet.h>
25
26	static DWORD dword;
27
28	#define u_handle HANDLE
29	#define u_setenv(name,value) SetEnvironmentVariable (name, value)
30	#define u_mkdir(path) !CreateDirectory (path, NULL)
31	#define u_chdir(path) !SetCurrentDirectory (path)
32	#define u_rename(fr,to) !MoveFile (fr, to)
33	#define u_open(path) CreateFile (path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL \| FILE_FLAG_SEQUENTIAL_SCAN, NULL)
34	#define u_creat(path,exec) CreateFile (path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL \| FILE_FLAG_SEQUENTIAL_SCAN, NULL)
35	#define u_close(handle) CloseHandle (handle)
36	#define u_append(path,add) PathAppend (path, add)
37	#define u_write(handle,data,len) (WriteFile (handle, data, len, &dword, 0) ? dword : -1)
38	#define u_sync() // use transacted I/O?
39
40	#else
41
42	#include <sys/mman.h>
43	#include <sys/types.h>
44	#include <pwd.h>
45
46	#ifdef PATH_MAX
47	#define MAX_PATH (PATH_MAX < 4096 ? 4096 : PATH_MAX)
48	#else
49	#define MAX_PATH 4096
50	#endif
51
52	#define u_handle int
53	#define u_setenv(name,value) setenv (name, value, 1)
54	#define u_mkdir(path) mkdir (path, 0777)
55	#define u_chdir(path) chdir (path)
56	#define u_rename(fr,to) rename (fr, to)
57	#define u_open(path) open (path, O_RDONLY) + 1
58	#define u_creat(path,exec) open (path, O_WRONLY \| O_CREAT \| O_TRUNC, (exec) ? 0777 : 0666) + 1
59	#define u_close(handle) close (handle - 1)
60	#define u_append(path,add) strcat (strcat (path, "/"), add)
61	#define u_write(handle,data,len) write ((handle) - 1, data, len)
62	#define u_sync() sync ()
63
64	#endif
65
66	#define u_16(ptr) (((ptr)[0] << 8) \| (ptr)[1])
67	#define u_32(ptr) (((ptr)[0] << 24) \| ((ptr)[1] << 16) \| ((ptr)[2] << 8) \| (ptr)[3])
68
69	static u_handle pack_handle;
70	static char tmppath[MAX_PATH];
71	static char currdir[MAX_PATH];
72	static char datadir[MAX_PATH]; // %AppData%/urlader
73	static char exe_dir[MAX_PATH]; // %AppData%/urlader/EXE_ID
74	static char execdir[MAX_PATH]; // %AppData%/urlader/EXE_ID/EXE_VER
75	static char exe_id[MAX_PATH];
76	static char exe_ver[MAX_PATH];
77
78	static int exe_argc;
79	static const char *exe_argv[32];
80
81	static void
82	fatal (const char *msg)
83	{
84	#ifdef _WIN32
85	MessageBox (0, msg, URLADER, 0);
86	#else
87	fprintf (stderr, "%s: %s\n", URLADER, msg);
88	#endif
89
90	_exit (1);
91	}
92
93	static void
94	tmpdir (const char *dir)
95	{
96	static int cnt;
97
98	for (;;)
99	{
100	// #ifdef _WIN32
101	// sprintf (tmppath, "%s/%x_%x.tmp", dir, (unsigned int)GetCurrentProcessId (), ++cnt);
102	// #else
103	sprintf (tmppath, "%s/t-%x_%x.tmp", dir, (unsigned int)getpid () , ++cnt);
104	// #endif
105
106	if (!u_mkdir (tmppath))
107	return;
108	}
109	}
110
111	static void
112	systemv (const char *const argv[], int dowait)
113	{
114	#ifdef _WIN32
115	_spawnv (P_WAIT, argv [0], argv);
116	#else
117	pid_t pid = dowait ? fork () : 0;
118
119	if (pid < 0)
120	fatal ("fork failure");
121
122	if (!pid)
123	{
124	execv (argv [0], (void *)argv);
125	_exit (124);
126	}
127
128	int status;
129	waitpid (pid, &status, 0);
130	#endif
131	}
132
133	static void
134	deltree (const char *path)
135	{
136	#ifdef _WIN32
137	char buf[MAX_PATH * 2 + 64];
138	const char *argv[] = { getenv ("COMSPEC"), "/c", "rd", "/s", "/q", buf, 0 };
139	sprintf (buf, "\"%s\"", path);
140	#else
141	const char *argv[] = { "/bin/rm", "-rf", path, 0 };
142	#endif
143	systemv (argv, 1);
144	}
145
146	enum
147	{
148	T_NULL, // 5
149	T_META, // 1 : exe_id, exe_ver
150	T_ARG, // 2 : arg
151	T_ENV, // 3 : name, value
152	T_DIR, // 4+: path
153	T_FILE, // 4+: path, data
154	T_NUM
155	};
156
157	enum
158	{
159	F_EXEC = 1,
160	F_LZF = 2,
161	F_NULL = 0
162	};
163
164	struct hdr
165	{
166	unsigned char type;
167	unsigned char flags;
168	unsigned char namelen[2];
169	unsigned char datalen[4];
170	};
171
172	struct tail {
173	unsigned char max_filesize[4];
174	unsigned char size[4];
175	char magic[12];
176	};
177
178	static char pack_base, pack_end;
179	static struct hdr *pack_cur;
180	static char *scratch;
181	static unsigned int scratch_len;
182
183	#define PACK_NAME ((char *)(pack_cur + 1))
184	#define PACK_DATA (PACK_NAME + u_16 (pack_cur->namelen) + 1)
185	#define PACK_VALID pack_cur->type
186
187	static void
188	pack_next (void)
189	{
190	unsigned int d = u_32 (pack_cur->datalen);
191
192	pack_cur = (struct hdr *)(PACK_DATA + d);
193	}
194
195	static void
196	pack_unmap (void)
197	{
198	if (!pack_base)
199	return;
200
201	free (scratch);
202
203	#ifdef _WIN32
204	UnmapViewOfFile (pack_base);
205	#else
206	munmap (pack_base, pack_end - pack_base);
207	#endif
208	}
209
210	static int
211	pack_map (void)
212	{
213	#ifdef _WIN32
214	BY_HANDLE_FILE_INFORMATION fi;
215
216	if (!GetFileInformationByHandle (pack_handle, &fi))
217	return 0;
218
219	if (fi.nFileSizeHigh) // too big
220	return 0;
221
222	HANDLE handle = CreateFileMapping (pack_handle, 0, PAGE_READONLY, 0, fi.nFileSizeLow, NULL);
223
224	if (!handle)
225	return 0;
226
227	pack_unmap ();
228
229	pack_base = MapViewOfFile (handle, FILE_MAP_READ, 0, 0, fi.nFileSizeLow);
230
231	CloseHandle (handle);
232
233	pack_end = pack_base + fi.nFileSizeLow;
234	#else
235	off_t len = lseek (pack_handle - 1, 0, SEEK_END);
236
237	pack_unmap ();
238
239	pack_base = mmap (0, len, PROT_READ, MAP_SHARED, pack_handle - 1, 0);
240	if (pack_base == (void *)-1)
241	pack_base = 0;
242
243	pack_end = pack_base + len;
244	#endif
245
246	if (!pack_base)
247	return 0;
248
249	struct tail *tail;
250
251	tail = (void )(pack_end - sizeof (tail));
252
253	if (memcmp (tail->magic, TAIL_MAGIC, sizeof (TAIL_MAGIC) - 1))
254	return 0;
255
256	pack_cur = (struct hdr *)(pack_end - u_32 (tail->size));
257
258	free (scratch);
259	scratch = malloc (scratch_len = u_32 (tail->max_filesize));
260
261	return 1;
262	}
263
264	static void
265	exe_info (void)
266	{
267	if (!pack_map ())
268	fatal ("unable to locate packfile in executable - executable corrupted?");
269
270	if (pack_cur->type != T_META)
271	fatal ("unable to locate executable metadata - executable corrupted?");
272
273	strcpy (exe_id, PACK_NAME);
274	}
275
276	static void
277	load (void)
278	{
279	u_mkdir (datadir);
280
281	strcpy (exe_dir, datadir);
282	u_append (exe_dir, exe_id);
283	u_mkdir (exe_dir);
284
285	if (u_chdir (exe_dir))
286	fatal ("unable to change to application data directory");
287
288	u_handle h = u_open ("override");
289	if (h)
290	{
291	u_handle oh = pack_handle;
292
293	pack_handle = h;
294	if (!pack_map ())
295	{
296	pack_handle = oh;
297	oh = h;
298	}
299
300	u_close (oh);
301	}
302
303	if (pack_cur->type != T_META)
304	fatal ("unable to locate override metadata");
305
306	strcpy (exe_ver, PACK_DATA);
307	pack_next ();
308
309	while (pack_cur->type == T_ARG)
310	{
311	exe_argv [exe_argc++] = strdup (PACK_NAME);
312	pack_next ();
313	}
314
315	while (pack_cur->type == T_ENV)
316	{
317	u_setenv (PACK_NAME, PACK_DATA);
318	pack_next ();
319	}
320
321	strcpy (execdir, exe_dir);
322	u_append (execdir, "i-");
323	strcat (execdir, exe_ver);
324
325	if (access (execdir, F_OK))
326	{
327	// does not exist yet, so unpack and move
328	tmpdir (exe_dir);
329
330	if (u_chdir (tmppath))
331	fatal ("unable to change to new instance directory");
332
333	for (;;)
334	{
335	switch (pack_cur->type)
336	{
337	case T_DIR:
338	u_mkdir (PACK_NAME);
339	break;
340
341	case T_FILE:
342	{
343	u_handle h = u_creat (PACK_NAME, pack_cur->flags & F_EXEC);
344	unsigned int dlen, len = u_32 (pack_cur->datalen);
345	char *data = PACK_DATA;
346
347	if (pack_cur->flags & F_LZF)
348	if (dlen = lzf_decompress (data, len, scratch, scratch_len))
349	{
350	data = scratch;
351	len = dlen;
352	}
353	else
354	fatal ("unable to uncompress file data - pack corrupted?");
355
356	if (!h)
357	fatal ("unable to unpack file from packfile - disk full?");
358
359	if (u_write (h, data, len) != len)
360	fatal ("unable to unpack file from packfile - disk full?");
361
362	u_close (h);
363	}
364	break;
365
366	case T_NULL:
367	goto done;
368	}
369
370	pack_next ();
371	}
372
373	done:
374	if (u_chdir (datadir))
375	fatal ("unable to change to data directory");
376
377	u_sync ();
378
379	if (u_rename (tmppath, execdir))
380	deltree (tmppath); // if move fails, delete new, assume other process created it independently
381	}
382
383	pack_unmap ();
384	u_close (pack_handle);
385
386	if (u_chdir (execdir))
387	fatal ("unable to change to application instance directory");
388
389	u_setenv ("URLADER_VERSION", URLADER_VERSION);
390	u_setenv ("URLADER_DATADIR", datadir);
391	u_setenv ("URLADER_EXECDIR", execdir);
392	u_setenv ("URLADER_EXE_ID" , exe_id);
393	u_setenv ("URLADER_EXE_DIR", exe_dir);
394	u_setenv ("URLADER_EXE_VER", exe_ver);
395
396	// yes, this is overkill
397	u_setenv ("SHLIB_PATH" , execdir); // hpux
398	u_setenv ("LIBPATH" , execdir); // aix
399	u_setenv ("LD_LIBRARY_PATH" , execdir); // most elf systems
400	u_setenv ("LD_LIBRARY_PATH_32", execdir); // solaris
401	u_setenv ("LD_LIBRARY_PATH_64", execdir); // solaris
402	u_setenv ("LD_LIBRARYN32_PATH", execdir); // irix
403	u_setenv ("LD_LIBRARY64_PATH" , execdir); // irix
404	u_setenv ("DYLD_LIBRARY_PATH" , execdir); // os sucks from apple
405	}
406
407	static void
408	execute (void)
409	{
410	exe_argv [exe_argc] = 0;
411	systemv (exe_argv, 0);
412	}
413
414	#ifdef _WIN32
415
416	int APIENTRY
417	WinMain (HINSTANCE hI, HINSTANCE hP, LPSTR argv, int command_show)
418	{
419	if (!GetModuleFileName (hI, tmppath, sizeof (tmppath)))
420	fatal ("unable to find executable pack");
421
422	if (!(pack_handle = u_open (tmppath)))
423	fatal ("unable to open executable pack");
424
425	exe_info ();
426
427	if (!GetCurrentDirectory (sizeof (currdir), currdir))
428	strcpy (currdir, ".");
429
430	if (SHGetFolderPath (0, CSIDL_APPDATA \| CSIDL_FLAG_CREATE, NULL, SHGFP_TYPE_CURRENT, datadir) != S_OK)
431	fatal ("unable to find application data directory");
432
433	u_mkdir (datadir);
434	u_append (datadir, URLADER);
435
436	load ();
437	execute ();
438
439	return 0;
440	}
441
442	#else
443
444	int
445	main (int argc, char *argv[])
446	{
447	char *home = getenv ("HOME");
448
449	// we assume fd 0 and 2 are "normal"
450
451	if (!(pack_handle = u_open (argv [0])))
452	fatal ("unable to open executable pack");
453
454	exe_info ();
455
456	if (!home)
457	{
458	struct passwd *pw;
459
460	if ((pw = getpwuid (getuid ())))
461	home = pw->pw_dir;
462	else
463	home = "/tmp";
464	}
465
466	if (!getcwd (currdir, sizeof (currdir)))
467	strcpy (currdir, ".");
468
469	u_mkdir (home);
470	sprintf (datadir, "%s/.%s", home, URLADER);
471	u_mkdir (datadir);
472
473	if (gethostname (tmppath, sizeof (tmppath)))
474	strcpy (tmppath, "default");
475
476	u_append (datadir, tmppath);
477
478	load ();
479	execute ();
480
481	return 0;
482	}
483
484	#endif
485