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)

#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)

#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");

      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:	1.2
Committed:	Thu Dec 29 10:20:56 2011 UTC (12 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+33 -16 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
39	#else
40
41	#include <sys/mman.h>
42	#include <sys/types.h>
43	#include <pwd.h>
44
45	#ifdef PATH_MAX
46	#define MAX_PATH (PATH_MAX < 4096 ? 4096 : PATH_MAX)
47	#else
48	#define MAX_PATH 4096
49	#endif
50
51	#define u_handle int
52	#define u_setenv(name,value) setenv (name, value, 1)
53	#define u_mkdir(path) mkdir (path, 0777)
54	#define u_chdir(path) chdir (path)
55	#define u_rename(fr,to) rename (fr, to)
56	#define u_open(path) open (path, O_RDONLY) + 1
57	#define u_creat(path,exec) open (path, O_WRONLY \| O_CREAT \| O_TRUNC, (exec) ? 0777 : 0666) + 1
58	#define u_close(handle) close (handle - 1)
59	#define u_append(path,add) strcat (strcat (path, "/"), add)
60	#define u_write(handle,data,len) write ((handle) - 1, data, len)
61
62	#endif
63
64	#define u_16(ptr) (((ptr)[0] << 8) \| (ptr)[1])
65	#define u_32(ptr) (((ptr)[0] << 24) \| ((ptr)[1] << 16) \| ((ptr)[2] << 8) \| (ptr)[3])
66
67	static u_handle pack_handle;
68	static char tmppath[MAX_PATH];
69	static char currdir[MAX_PATH];
70	static char datadir[MAX_PATH]; // %AppData%/urlader
71	static char exe_dir[MAX_PATH]; // %AppData%/urlader/EXE_ID
72	static char execdir[MAX_PATH]; // %AppData%/urlader/EXE_ID/EXE_VER
73	static char exe_id[MAX_PATH];
74	static char exe_ver[MAX_PATH];
75
76	static int exe_argc;
77	static const char *exe_argv[32];
78
79	static void
80	fatal (const char *msg)
81	{
82	#ifdef _WIN32
83	MessageBox (0, msg, URLADER, 0);
84	#else
85	fprintf (stderr, "%s: %s\n", URLADER, msg);
86	#endif
87
88	_exit (1);
89	}
90
91	static void
92	tmpdir (const char *dir)
93	{
94	static int cnt;
95
96	for (;;)
97	{
98	// #ifdef _WIN32
99	// sprintf (tmppath, "%s/%x_%x.tmp", dir, (unsigned int)GetCurrentProcessId (), ++cnt);
100	// #else
101	sprintf (tmppath, "%s/t-%x_%x.tmp", dir, (unsigned int)getpid () , ++cnt);
102	// #endif
103
104	if (!u_mkdir (tmppath))
105	return;
106	}
107	}
108
109	static void
110	systemv (const char *const argv[], int dowait)
111	{
112	#ifdef _WIN32
113	_spawnv (P_WAIT, argv [0], argv);
114	#else
115	pid_t pid = dowait ? fork () : 0;
116
117	if (pid < 0)
118	fatal ("fork failure");
119
120	if (!pid)
121	{
122	execv (argv [0], (void *)argv);
123	_exit (124);
124	}
125
126	int status;
127	waitpid (pid, &status, 0);
128	#endif
129	}
130
131	static void
132	deltree (const char *path)
133	{
134	#ifdef _WIN32
135	char buf[MAX_PATH * 2 + 64];
136	const char *argv[] = { getenv ("COMSPEC"), "/c", "rd", "/s", "/q", buf, 0 };
137	sprintf (buf, "\"%s\"", path);
138	#else
139	const char *argv[] = { "/bin/rm", "-rf", path, 0 };
140	#endif
141	systemv (argv, 1);
142	}
143
144	enum
145	{
146	T_NULL, // 5
147	T_META, // 1 : exe_id, exe_ver
148	T_ARG, // 2 : arg
149	T_ENV, // 3 : name, value
150	T_DIR, // 4+: path
151	T_FILE, // 4+: path, data
152	T_NUM
153	};
154
155	enum
156	{
157	F_EXEC = 1,
158	F_LZF = 2,
159	F_NULL = 0
160	};
161
162	struct hdr
163	{
164	unsigned char type;
165	unsigned char flags;
166	unsigned char namelen[2];
167	unsigned char datalen[4];
168	};
169
170	struct tail {
171	unsigned char max_filesize[4];
172	unsigned char size[4];
173	char magic[12];
174	};
175
176	static char pack_base, pack_end;
177	static struct hdr *pack_cur;
178	static char *scratch;
179	static unsigned int scratch_len;
180
181	#define PACK_NAME ((char *)(pack_cur + 1))
182	#define PACK_DATA (PACK_NAME + u_16 (pack_cur->namelen) + 1)
183	#define PACK_VALID pack_cur->type
184
185	static void
186	pack_next (void)
187	{
188	unsigned int d = u_32 (pack_cur->datalen);
189
190	pack_cur = (struct hdr *)(PACK_DATA + d);
191	}
192
193	static void
194	pack_unmap (void)
195	{
196	if (!pack_base)
197	return;
198
199	free (scratch);
200
201	#ifdef _WIN32
202	UnmapViewOfFile (pack_base);
203	#else
204	munmap (pack_base, pack_end - pack_base);
205	#endif
206	}
207
208	static int
209	pack_map (void)
210	{
211	#ifdef _WIN32
212	BY_HANDLE_FILE_INFORMATION fi;
213
214	if (!GetFileInformationByHandle (pack_handle, &fi))
215	return 0;
216
217	if (fi.nFileSizeHigh) // too big
218	return 0;
219
220	HANDLE handle = CreateFileMapping (pack_handle, 0, PAGE_READONLY, 0, fi.nFileSizeLow, NULL);
221
222	if (!handle)
223	return 0;
224
225	pack_unmap ();
226
227	pack_base = MapViewOfFile (handle, FILE_MAP_READ, 0, 0, fi.nFileSizeLow);
228
229	CloseHandle (handle);
230
231	pack_end = pack_base + fi.nFileSizeLow;
232	#else
233	off_t len = lseek (pack_handle - 1, 0, SEEK_END);
234
235	pack_unmap ();
236
237	pack_base = mmap (0, len, PROT_READ, MAP_SHARED, pack_handle - 1, 0);
238	if (pack_base == (void *)-1)
239	pack_base = 0;
240
241	pack_end = pack_base + len;
242	#endif
243
244	if (!pack_base)
245	return 0;
246
247	struct tail *tail;
248
249	tail = (void )(pack_end - sizeof (tail));
250
251	if (memcmp (tail->magic, TAIL_MAGIC, sizeof (TAIL_MAGIC) - 1))
252	return 0;
253
254	pack_cur = (struct hdr *)(pack_end - u_32 (tail->size));
255
256	free (scratch);
257	scratch = malloc (scratch_len = u_32 (tail->max_filesize));
258
259	return 1;
260	}
261
262	static void
263	exe_info (void)
264	{
265	if (!pack_map ())
266	fatal ("unable to locate packfile in executable - executable corrupted?");
267
268	if (pack_cur->type != T_META)
269	fatal ("unable to locate executable metadata - executable corrupted?");
270
271	strcpy (exe_id, PACK_NAME);
272	}
273
274	static void
275	load (void)
276	{
277	u_mkdir (datadir);
278
279	strcpy (exe_dir, datadir);
280	u_append (exe_dir, exe_id);
281	u_mkdir (exe_dir);
282
283	if (u_chdir (exe_dir))
284	fatal ("unable to change to application data directory");
285
286	u_handle h = u_open ("override");
287	if (h)
288	{
289	u_handle oh = pack_handle;
290
291	pack_handle = h;
292	if (!pack_map ())
293	{
294	pack_handle = oh;
295	oh = h;
296	}
297
298	u_close (oh);
299	}
300
301	if (pack_cur->type != T_META)
302	fatal ("unable to locate override metadata");
303
304	strcpy (exe_ver, PACK_DATA);
305	pack_next ();
306
307	while (pack_cur->type == T_ARG)
308	{
309	exe_argv [exe_argc++] = strdup (PACK_NAME);
310	pack_next ();
311	}
312
313	while (pack_cur->type == T_ENV)
314	{
315	u_setenv (PACK_NAME, PACK_DATA);
316	pack_next ();
317	}
318
319	strcpy (execdir, exe_dir);
320	u_append (execdir, "i-");
321	strcat (execdir, exe_ver);
322
323	if (access (execdir, F_OK))
324	{
325	// does not exist yet, so unpack and move
326	tmpdir (exe_dir);
327
328	if (u_chdir (tmppath))
329	fatal ("unable to change to new instance directory");
330
331	for (;;)
332	{
333	switch (pack_cur->type)
334	{
335	case T_DIR:
336	u_mkdir (PACK_NAME);
337	break;
338
339	case T_FILE:
340	{
341	u_handle h = u_creat (PACK_NAME, pack_cur->flags & F_EXEC);
342	unsigned int dlen, len = u_32 (pack_cur->datalen);
343	char *data = PACK_DATA;
344
345	if (pack_cur->flags & F_LZF)
346	if (dlen = lzf_decompress (data, len, scratch, scratch_len))
347	{
348	data = scratch;
349	len = dlen;
350	}
351	else
352	fatal ("unable to uncompress file data - pack corrupted?");
353
354	if (!h)
355	fatal ("unable to unpack file from packfile - disk full?");
356
357	if (u_write (h, data, len) != len)
358	fatal ("unable to unpack file from packfile - disk full?");
359
360	u_close (h);
361	}
362	break;
363
364	case T_NULL:
365	goto done;
366	}
367
368	pack_next ();
369	}
370
371	done:
372	if (u_chdir (datadir))
373	fatal ("unable to change to data directory");
374
375	if (u_rename (tmppath, execdir))
376	deltree (tmppath); // if move fails, delete new, assume other process created it independently
377	}
378
379	pack_unmap ();
380	u_close (pack_handle);
381
382	if (u_chdir (execdir))
383	fatal ("unable to change to application instance directory");
384
385	u_setenv ("URLADER_VERSION", URLADER_VERSION);
386	u_setenv ("URLADER_DATADIR", datadir);
387	u_setenv ("URLADER_EXECDIR", execdir);
388	u_setenv ("URLADER_EXE_ID" , exe_id);
389	u_setenv ("URLADER_EXE_DIR", exe_dir);
390	u_setenv ("URLADER_EXE_VER", exe_ver);
391
392	// yes, this is overkill
393	u_setenv ("SHLIB_PATH" , execdir); // hpux
394	u_setenv ("LIBPATH" , execdir); // aix
395	u_setenv ("LD_LIBRARY_PATH" , execdir); // most elf systems
396	u_setenv ("LD_LIBRARY_PATH_32", execdir); // solaris
397	u_setenv ("LD_LIBRARY_PATH_64", execdir); // solaris
398	u_setenv ("LD_LIBRARYN32_PATH", execdir); // irix
399	u_setenv ("LD_LIBRARY64_PATH" , execdir); // irix
400	u_setenv ("DYLD_LIBRARY_PATH" , execdir); // os sucks from apple
401	}
402
403	static void
404	execute (void)
405	{
406	exe_argv [exe_argc] = 0;
407	systemv (exe_argv, 0);
408	}
409
410	#ifdef _WIN32
411
412	int APIENTRY
413	WinMain (HINSTANCE hI, HINSTANCE hP, LPSTR argv, int command_show)
414	{
415	if (!GetModuleFileName (hI, tmppath, sizeof (tmppath)))
416	fatal ("unable to find executable pack");
417
418	if (!(pack_handle = u_open (tmppath)))
419	fatal ("unable to open executable pack");
420
421	exe_info ();
422
423	if (!GetCurrentDirectory (sizeof (currdir), currdir))
424	strcpy (currdir, ".");
425
426	if (SHGetFolderPath (0, CSIDL_APPDATA \| CSIDL_FLAG_CREATE, NULL, SHGFP_TYPE_CURRENT, datadir) != S_OK)
427	fatal ("unable to find application data directory");
428
429	u_mkdir (datadir);
430	u_append (datadir, URLADER);
431
432	load ();
433	execute ();
434
435	return 0;
436	}
437
438	#else
439
440	int
441	main (int argc, char *argv[])
442	{
443	char *home = getenv ("HOME");
444
445	// we assume fd 0 and 2 are "normal"
446
447	if (!(pack_handle = u_open (argv [0])))
448	fatal ("unable to open executable pack");
449
450	exe_info ();
451
452	if (!home)
453	{
454	struct passwd *pw;
455
456	if ((pw = getpwuid (getuid ())))
457	home = pw->pw_dir;
458	else
459	home = "/tmp";
460	}
461
462	if (!getcwd (currdir, sizeof (currdir)))
463	strcpy (currdir, ".");
464
465	u_mkdir (home);
466	sprintf (datadir, "%s/.%s", home, URLADER);
467	u_mkdir (datadir);
468
469	if (gethostname (tmppath, sizeof (tmppath)))
470	strcpy (tmppath, "default");
471
472	u_append (datadir, tmppath);
473
474	load ();
475	execute ();
476
477	return 0;
478	}
479
480	#endif
481