Urlader/urlader.c

#include "urlib.h"
#include "urlib.c"

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

#include "liblzf/lzf_d.c"

/* some simple? dynamic memory management for paths might save ltos of ram */
static u_handle pack_handle;
static u_handle lock_handle;
static char tmppath[MAX_PATH];

static int exe_argc;
static const char *exe_argv[MAX_ARGC];
static char exe_args[MAX_ARGS]; /* actual arguments strings copied here */
static unsigned int exe_argo;

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[])
{
#ifdef _WIN32
  _spawnv (P_WAIT, argv [0], argv);
#else
  pid_t pid = fork ();

  if (pid < 0)
    u_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);
}

static char *pack_base, *pack_end;
static struct u_pack_hdr *pack_cur;
static char *scratch;
static unsigned int scratch_size;

#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 u_pack_hdr *)(PACK_DATA + d);
}

static void
pack_unmap (void)
{
  if (pack_base)
    {
      u_munmap (pack_base, pack_end - pack_base);
      pack_base = 0;
    }

  if (scratch)
    {
      u_free (scratch, scratch_size);
      scratch = 0;
    }
}

static int
pack_map (void)
{
  char *addr;
  unsigned int size;

#ifdef _WIN32
  BY_HANDLE_FILE_INFORMATION fi;

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

  size = fi.nFileSizeLow;
#else
  size = lseek (pack_handle, 0, SEEK_END);
#endif

  addr = u_mmap (pack_handle, size);
  if (!addr)
    return 0;

  pack_unmap ();

  pack_base = addr;
  pack_end  = pack_base + size;

  struct u_pack_tail *tail;

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

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

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

  scratch = u_malloc (scratch_size = u_32 (tail->max_uncompressed));
  if (!scratch)
    return 0;

  return 1;
}

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

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

  strcpy (exe_id, PACK_NAME);
}

static void
load (void)
{
  if (u_chdir (exe_dir))
    u_fatal ("unable to change to application data directory");

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

      pack_handle = h;
      if (pack_map ())
        u_setenv ("URLADER_OVERRIDE", "override");
      else
        {
          pack_handle = oh;
          oh = h;
        }

      u_close (oh);
    }

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

  strcpy (exe_ver, PACK_DATA);
  u_set_exe_info ();
  pack_next ();

  for (;;)
    {
      if (pack_cur->type == T_ENV)
        u_setenv (PACK_NAME, PACK_DATA);
      else if (pack_cur->type == T_ARG)
        {
          int len = u_16 (pack_cur->namelen) + 1;
          exe_argv [exe_argc++] = exe_args + exe_argo;
          memcpy (exe_args + exe_argo, PACK_NAME, len);
          exe_argo += len;
        }
      else
        break;

      pack_next ();
    }
 
done_env_arg:

  strcat (strcpy (tmppath, execdir), ".lck");
  lock_handle = u_lock (tmppath, 0, 1);
  if (!lock_handle)
    u_fatal ("unable to lock application instance");

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

      if (u_chdir (tmppath))
        u_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_size))
                      {
                        data = scratch;
                        len  = dlen;
                      }
                    else
                      u_fatal ("unable to uncompress file data - pack corrupted?");

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

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

                  u_fsync (h);
                  u_close (h);
                }
                break;

              case T_NULL:
                goto done;
            }

          pack_next ();
        }

done:
      if (u_chdir (datadir))
        u_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))
    u_fatal ("unable to change to application instance directory");

  u_setenv ("URLADER_VERSION", URLADER_VERSION);

#if 0
  // 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
#endif
}

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

static void
doit (void)
{
  u_set_datadir ();
  u_mkdir (datadir);

  exe_info ();
  u_set_exe_info ();

  load ();
  execute ();
}

#ifdef _WIN32

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

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

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

  doit ();

  return 0;
}

#else

int
main (int argc, char *argv[])
{
  pack_handle = u_open (argv [0]);
  if (!u_valid (pack_handle))
    u_fatal ("unable to open executable pack");

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

#if 0
  /* intersperse hostname, for whatever reason */

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

  u_append (datadir, tmppath);
#endif

  doit ();

  return 0;
}

#endif

Revision:	1.11
Committed:	Thu Jan 5 06:00:13 2012 UTC (12 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.10:	+7 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.9	#include "urlib.h"
2	root	1.8	#include "urlib.c"
3	root	1.6
4	root	1.1	#include <stdio.h>
5			#include <stdlib.h>
6			#include <unistd.h>
7			#include <errno.h>
8			#include <string.h>
9			#include <time.h>
10
11	root	1.2	#include "liblzf/lzf_d.c"
12	root	1.1
13	root	1.6	/* some simple? dynamic memory management for paths might save ltos of ram */
14	root	1.1	static u_handle pack_handle;
15	root	1.6	static u_handle lock_handle;
16	root	1.1	static char tmppath[MAX_PATH];
17
18			static int exe_argc;
19	root	1.6	static const char *exe_argv[MAX_ARGC];
20			static char exe_args[MAX_ARGS]; /* actual arguments strings copied here */
21			static unsigned int exe_argo;
22	root	1.1
23			static void
24			tmpdir (const char *dir)
25			{
26			static int cnt;
27
28			for (;;)
29			{
30			// #ifdef _WIN32
31			// sprintf (tmppath, "%s/%x_%x.tmp", dir, (unsigned int)GetCurrentProcessId (), ++cnt);
32			// #else
33			sprintf (tmppath, "%s/t-%x_%x.tmp", dir, (unsigned int)getpid () , ++cnt);
34			// #endif
35
36			if (!u_mkdir (tmppath))
37			return;
38			}
39			}
40
41			static void
42	root	1.6	systemv (const char *const argv[])
43	root	1.1	{
44			#ifdef _WIN32
45			_spawnv (P_WAIT, argv [0], argv);
46			#else
47	root	1.6	pid_t pid = fork ();
48	root	1.1
49			if (pid < 0)
50	root	1.9	u_fatal ("fork failure");
51	root	1.1
52			if (!pid)
53			{
54			execv (argv [0], (void *)argv);
55			_exit (124);
56			}
57
58			int status;
59			waitpid (pid, &status, 0);
60			#endif
61			}
62
63			static void
64			deltree (const char *path)
65			{
66			#ifdef _WIN32
67			char buf[MAX_PATH * 2 + 64];
68			const char *argv[] = { getenv ("COMSPEC"), "/c", "rd", "/s", "/q", buf, 0 };
69			sprintf (buf, "\"%s\"", path);
70			#else
71			const char *argv[] = { "/bin/rm", "-rf", path, 0 };
72			#endif
73	root	1.6	systemv (argv);
74	root	1.1	}
75
76			static char pack_base, pack_end;
77	root	1.8	static struct u_pack_hdr *pack_cur;
78	root	1.2	static char *scratch;
79	root	1.6	static unsigned int scratch_size;
80	root	1.1
81			#define PACK_NAME ((char *)(pack_cur + 1))
82			#define PACK_DATA (PACK_NAME + u_16 (pack_cur->namelen) + 1)
83			#define PACK_VALID pack_cur->type
84
85			static void
86			pack_next (void)
87			{
88			unsigned int d = u_32 (pack_cur->datalen);
89
90	root	1.8	pack_cur = (struct u_pack_hdr *)(PACK_DATA + d);
91	root	1.1	}
92
93			static void
94			pack_unmap (void)
95			{
96	root	1.6	if (pack_base)
97			{
98			u_munmap (pack_base, pack_end - pack_base);
99			pack_base = 0;
100			}
101	root	1.1
102	root	1.6	if (scratch)
103			{
104			u_free (scratch, scratch_size);
105			scratch = 0;
106			}
107	root	1.1	}
108
109			static int
110			pack_map (void)
111			{
112	root	1.6	char *addr;
113			unsigned int size;
114
115	root	1.1	#ifdef _WIN32
116			BY_HANDLE_FILE_INFORMATION fi;
117
118			if (!GetFileInformationByHandle (pack_handle, &fi))
119			return 0;
120
121	root	1.6	size = fi.nFileSizeLow;
122			#else
123			size = lseek (pack_handle, 0, SEEK_END);
124			#endif
125	root	1.1
126	root	1.6	addr = u_mmap (pack_handle, size);
127			if (!addr)
128	root	1.1	return 0;
129
130			pack_unmap ();
131
132	root	1.6	pack_base = addr;
133			pack_end = pack_base + size;
134	root	1.1
135	root	1.8	struct u_pack_tail *tail;
136	root	1.1
137			tail = (void )(pack_end - sizeof (tail));
138
139			if (memcmp (tail->magic, TAIL_MAGIC, sizeof (TAIL_MAGIC) - 1))
140			return 0;
141
142	root	1.8	pack_cur = (struct u_pack_hdr *)(pack_end - u_32 (tail->size));
143	root	1.1
144	root	1.10	scratch = u_malloc (scratch_size = u_32 (tail->max_uncompressed));
145	root	1.6	if (!scratch)
146			return 0;
147	root	1.2
148	root	1.1	return 1;
149			}
150
151			static void
152			exe_info (void)
153			{
154			if (!pack_map ())
155	root	1.9	u_fatal ("unable to locate packfile in executable - executable corrupted?");
156	root	1.1
157	root	1.9	if (pack_cur->type != T_META)
158			u_fatal ("unable to locate executable metadata - executable corrupted?");
159	root	1.1
160			strcpy (exe_id, PACK_NAME);
161			}
162
163			static void
164			load (void)
165			{
166			if (u_chdir (exe_dir))
167	root	1.9	u_fatal ("unable to change to application data directory");
168	root	1.1
169			u_handle h = u_open ("override");
170	root	1.5	if (u_valid (h))
171	root	1.1	{
172			u_handle oh = pack_handle;
173
174			pack_handle = h;
175	root	1.11	if (pack_map ())
176			u_setenv ("URLADER_OVERRIDE", "override");
177			else
178	root	1.1	{
179			pack_handle = oh;
180			oh = h;
181			}
182
183			u_close (oh);
184			}
185
186	root	1.9	if (pack_cur->type != T_META)
187			u_fatal ("unable to locate override metadata");
188	root	1.1
189			strcpy (exe_ver, PACK_DATA);
190	root	1.9	u_set_exe_info ();
191	root	1.1	pack_next ();
192
193	root	1.4	for (;;)
194	root	1.1	{
195	root	1.9	if (pack_cur->type == T_ENV)
196	root	1.4	u_setenv (PACK_NAME, PACK_DATA);
197	root	1.9	else if (pack_cur->type == T_ARG)
198	root	1.6	{
199			int len = u_16 (pack_cur->namelen) + 1;
200			exe_argv [exe_argc++] = exe_args + exe_argo;
201			memcpy (exe_args + exe_argo, PACK_NAME, len);
202			exe_argo += len;
203			}
204	root	1.4	else
205			break;
206	root	1.1
207			pack_next ();
208			}
209	root	1.4
210			done_env_arg:
211	root	1.1
212	root	1.6	strcat (strcpy (tmppath, execdir), ".lck");
213	root	1.7	lock_handle = u_lock (tmppath, 0, 1);
214	root	1.6	if (!lock_handle)
215	root	1.9	u_fatal ("unable to lock application instance");
216	root	1.6
217	root	1.1	if (access (execdir, F_OK))
218			{
219			// does not exist yet, so unpack and move
220			tmpdir (exe_dir);
221
222			if (u_chdir (tmppath))
223	root	1.9	u_fatal ("unable to change to new instance directory");
224	root	1.1
225			for (;;)
226			{
227			switch (pack_cur->type)
228			{
229	root	1.9	case T_DIR:
230	root	1.1	u_mkdir (PACK_NAME);
231			break;
232
233	root	1.9	case T_FILE:
234	root	1.1	{
235	root	1.9	u_handle h = u_creat (PACK_NAME, pack_cur->flags & F_EXEC);
236	root	1.2	unsigned int dlen, len = u_32 (pack_cur->datalen);
237			char *data = PACK_DATA;
238
239	root	1.9	if (pack_cur->flags & F_LZF)
240	root	1.6	if (dlen = lzf_decompress (data, len, scratch, scratch_size))
241	root	1.2	{
242			data = scratch;
243			len = dlen;
244			}
245			else
246	root	1.9	u_fatal ("unable to uncompress file data - pack corrupted?");
247	root	1.1
248	root	1.5	if (!u_valid (h))
249	root	1.9	u_fatal ("unable to unpack file from packfile - disk full?");
250	root	1.1
251	root	1.2	if (u_write (h, data, len) != len)
252	root	1.9	u_fatal ("unable to unpack file from packfile - disk full?");
253	root	1.1
254	root	1.4	u_fsync (h);
255	root	1.1	u_close (h);
256			}
257			break;
258
259	root	1.9	case T_NULL:
260	root	1.1	goto done;
261			}
262
263			pack_next ();
264			}
265
266			done:
267			if (u_chdir (datadir))
268	root	1.9	u_fatal ("unable to change to data directory");
269	root	1.1
270	root	1.3	u_sync ();
271
272	root	1.1	if (u_rename (tmppath, execdir))
273			deltree (tmppath); // if move fails, delete new, assume other process created it independently
274			}
275
276			pack_unmap ();
277			u_close (pack_handle);
278
279	root	1.2	if (u_chdir (execdir))
280	root	1.9	u_fatal ("unable to change to application instance directory");
281	root	1.2
282	root	1.1	u_setenv ("URLADER_VERSION", URLADER_VERSION);
283
284	root	1.5	#if 0
285	root	1.1	// yes, this is overkill
286			u_setenv ("SHLIB_PATH" , execdir); // hpux
287			u_setenv ("LIBPATH" , execdir); // aix
288			u_setenv ("LD_LIBRARY_PATH" , execdir); // most elf systems
289			u_setenv ("LD_LIBRARY_PATH_32", execdir); // solaris
290			u_setenv ("LD_LIBRARY_PATH_64", execdir); // solaris
291			u_setenv ("LD_LIBRARYN32_PATH", execdir); // irix
292			u_setenv ("LD_LIBRARY64_PATH" , execdir); // irix
293			u_setenv ("DYLD_LIBRARY_PATH" , execdir); // os sucks from apple
294	root	1.5	#endif
295	root	1.1	}
296
297	root	1.2	static void
298			execute (void)
299			{
300			exe_argv [exe_argc] = 0;
301	root	1.6	systemv (exe_argv);
302	root	1.2	}
303
304	root	1.9	static void
305			doit (void)
306			{
307			u_set_datadir ();
308			u_mkdir (datadir);
309
310			exe_info ();
311			u_set_exe_info ();
312
313			load ();
314			execute ();
315			}
316
317	root	1.1	#ifdef _WIN32
318
319			int APIENTRY
320			WinMain (HINSTANCE hI, HINSTANCE hP, LPSTR argv, int command_show)
321			{
322			if (!GetModuleFileName (hI, tmppath, sizeof (tmppath)))
323	root	1.9	u_fatal ("unable to find executable pack");
324	root	1.1
325	root	1.5	pack_handle = u_open (tmppath);
326			if (!u_valid (pack_handle))
327	root	1.9	u_fatal ("unable to open executable pack");
328	root	1.1
329			if (!GetCurrentDirectory (sizeof (currdir), currdir))
330			strcpy (currdir, ".");
331
332	root	1.11	doit ();
333
334	root	1.1	return 0;
335			}
336
337			#else
338
339			int
340			main (int argc, char *argv[])
341			{
342	root	1.5	pack_handle = u_open (argv [0]);
343			if (!u_valid (pack_handle))
344	root	1.9	u_fatal ("unable to open executable pack");
345	root	1.1
346			if (!getcwd (currdir, sizeof (currdir)))
347			strcpy (currdir, ".");
348
349	root	1.5	#if 0
350	root	1.11	/* intersperse hostname, for whatever reason */
351
352	root	1.1	if (gethostname (tmppath, sizeof (tmppath)))
353			strcpy (tmppath, "default");
354
355			u_append (datadir, tmppath);
356	root	1.5	#endif
357	root	1.1
358	root	1.9	doit ();
359	root	1.1
360			return 0;
361			}
362
363			#endif
364