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_filesize));
  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 ())
        {
          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, ".");

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

  u_append (datadir, tmppath);
#endif

  doit ();

  return 0;
}

#endif

Revision:	1.9
Committed:	Mon Jan 2 09:23:03 2012 UTC (12 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+40 -92 lines
Log Message:	* empty log message *
#	Content
1	#include "urlib.h"
2	#include "urlib.c"
3
4	#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	#include "liblzf/lzf_d.c"
12
13	/* some simple? dynamic memory management for paths might save ltos of ram */
14	static u_handle pack_handle;
15	static u_handle lock_handle;
16	static char tmppath[MAX_PATH];
17
18	static int exe_argc;
19	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
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	systemv (const char *const argv[])
43	{
44	#ifdef _WIN32
45	_spawnv (P_WAIT, argv [0], argv);
46	#else
47	pid_t pid = fork ();
48
49	if (pid < 0)
50	u_fatal ("fork failure");
51
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	systemv (argv);
74	}
75
76	static char pack_base, pack_end;
77	static struct u_pack_hdr *pack_cur;
78	static char *scratch;
79	static unsigned int scratch_size;
80
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	pack_cur = (struct u_pack_hdr *)(PACK_DATA + d);
91	}
92
93	static void
94	pack_unmap (void)
95	{
96	if (pack_base)
97	{
98	u_munmap (pack_base, pack_end - pack_base);
99	pack_base = 0;
100	}
101
102	if (scratch)
103	{
104	u_free (scratch, scratch_size);
105	scratch = 0;
106	}
107	}
108
109	static int
110	pack_map (void)
111	{
112	char *addr;
113	unsigned int size;
114
115	#ifdef _WIN32
116	BY_HANDLE_FILE_INFORMATION fi;
117
118	if (!GetFileInformationByHandle (pack_handle, &fi))
119	return 0;
120
121	size = fi.nFileSizeLow;
122	#else
123	size = lseek (pack_handle, 0, SEEK_END);
124	#endif
125
126	addr = u_mmap (pack_handle, size);
127	if (!addr)
128	return 0;
129
130	pack_unmap ();
131
132	pack_base = addr;
133	pack_end = pack_base + size;
134
135	struct u_pack_tail *tail;
136
137	tail = (void )(pack_end - sizeof (tail));
138
139	if (memcmp (tail->magic, TAIL_MAGIC, sizeof (TAIL_MAGIC) - 1))
140	return 0;
141
142	pack_cur = (struct u_pack_hdr *)(pack_end - u_32 (tail->size));
143
144	scratch = u_malloc (scratch_size = u_32 (tail->max_filesize));
145	if (!scratch)
146	return 0;
147
148	return 1;
149	}
150
151	static void
152	exe_info (void)
153	{
154	if (!pack_map ())
155	u_fatal ("unable to locate packfile in executable - executable corrupted?");
156
157	if (pack_cur->type != T_META)
158	u_fatal ("unable to locate executable metadata - executable corrupted?");
159
160	strcpy (exe_id, PACK_NAME);
161	}
162
163	static void
164	load (void)
165	{
166	if (u_chdir (exe_dir))
167	u_fatal ("unable to change to application data directory");
168
169	u_handle h = u_open ("override");
170	if (u_valid (h))
171	{
172	u_handle oh = pack_handle;
173
174	pack_handle = h;
175	if (!pack_map ())
176	{
177	pack_handle = oh;
178	oh = h;
179	}
180
181	u_close (oh);
182	}
183
184	if (pack_cur->type != T_META)
185	u_fatal ("unable to locate override metadata");
186
187	strcpy (exe_ver, PACK_DATA);
188	u_set_exe_info ();
189	pack_next ();
190
191	for (;;)
192	{
193	if (pack_cur->type == T_ENV)
194	u_setenv (PACK_NAME, PACK_DATA);
195	else if (pack_cur->type == T_ARG)
196	{
197	int len = u_16 (pack_cur->namelen) + 1;
198	exe_argv [exe_argc++] = exe_args + exe_argo;
199	memcpy (exe_args + exe_argo, PACK_NAME, len);
200	exe_argo += len;
201	}
202	else
203	break;
204
205	pack_next ();
206	}
207
208	done_env_arg:
209
210	strcat (strcpy (tmppath, execdir), ".lck");
211	lock_handle = u_lock (tmppath, 0, 1);
212	if (!lock_handle)
213	u_fatal ("unable to lock application instance");
214
215	if (access (execdir, F_OK))
216	{
217	// does not exist yet, so unpack and move
218	tmpdir (exe_dir);
219
220	if (u_chdir (tmppath))
221	u_fatal ("unable to change to new instance directory");
222
223	for (;;)
224	{
225	switch (pack_cur->type)
226	{
227	case T_DIR:
228	u_mkdir (PACK_NAME);
229	break;
230
231	case T_FILE:
232	{
233	u_handle h = u_creat (PACK_NAME, pack_cur->flags & F_EXEC);
234	unsigned int dlen, len = u_32 (pack_cur->datalen);
235	char *data = PACK_DATA;
236
237	if (pack_cur->flags & F_LZF)
238	if (dlen = lzf_decompress (data, len, scratch, scratch_size))
239	{
240	data = scratch;
241	len = dlen;
242	}
243	else
244	u_fatal ("unable to uncompress file data - pack corrupted?");
245
246	if (!u_valid (h))
247	u_fatal ("unable to unpack file from packfile - disk full?");
248
249	if (u_write (h, data, len) != len)
250	u_fatal ("unable to unpack file from packfile - disk full?");
251
252	u_fsync (h);
253	u_close (h);
254	}
255	break;
256
257	case T_NULL:
258	goto done;
259	}
260
261	pack_next ();
262	}
263
264	done:
265	if (u_chdir (datadir))
266	u_fatal ("unable to change to data directory");
267
268	u_sync ();
269
270	if (u_rename (tmppath, execdir))
271	deltree (tmppath); // if move fails, delete new, assume other process created it independently
272	}
273
274	pack_unmap ();
275	u_close (pack_handle);
276
277	if (u_chdir (execdir))
278	u_fatal ("unable to change to application instance directory");
279
280	u_setenv ("URLADER_VERSION", URLADER_VERSION);
281
282	#if 0
283	// yes, this is overkill
284	u_setenv ("SHLIB_PATH" , execdir); // hpux
285	u_setenv ("LIBPATH" , execdir); // aix
286	u_setenv ("LD_LIBRARY_PATH" , execdir); // most elf systems
287	u_setenv ("LD_LIBRARY_PATH_32", execdir); // solaris
288	u_setenv ("LD_LIBRARY_PATH_64", execdir); // solaris
289	u_setenv ("LD_LIBRARYN32_PATH", execdir); // irix
290	u_setenv ("LD_LIBRARY64_PATH" , execdir); // irix
291	u_setenv ("DYLD_LIBRARY_PATH" , execdir); // os sucks from apple
292	#endif
293	}
294
295	static void
296	execute (void)
297	{
298	exe_argv [exe_argc] = 0;
299	systemv (exe_argv);
300	}
301
302	static void
303	doit (void)
304	{
305	u_set_datadir ();
306	u_mkdir (datadir);
307
308	exe_info ();
309	u_set_exe_info ();
310
311	load ();
312	execute ();
313	}
314
315	#ifdef _WIN32
316
317	int APIENTRY
318	WinMain (HINSTANCE hI, HINSTANCE hP, LPSTR argv, int command_show)
319	{
320	if (!GetModuleFileName (hI, tmppath, sizeof (tmppath)))
321	u_fatal ("unable to find executable pack");
322
323	pack_handle = u_open (tmppath);
324	if (!u_valid (pack_handle))
325	u_fatal ("unable to open executable pack");
326
327	if (!GetCurrentDirectory (sizeof (currdir), currdir))
328	strcpy (currdir, ".");
329
330	return 0;
331	}
332
333	#else
334
335	int
336	main (int argc, char *argv[])
337	{
338	pack_handle = u_open (argv [0]);
339	if (!u_valid (pack_handle))
340	u_fatal ("unable to open executable pack");
341
342	if (!getcwd (currdir, sizeof (currdir)))
343	strcpy (currdir, ".");
344
345	#if 0
346	if (gethostname (tmppath, sizeof (tmppath)))
347	strcpy (tmppath, "default");
348
349	u_append (datadir, tmppath);
350	#endif
351
352	doit ();
353
354	return 0;
355	}
356
357	#endif
358