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/cvs/Urlader/urlib.c
Revision: 1.2
Committed: Mon Jan 2 09:23:04 2012 UTC (12 years, 10 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.1: +97 -16 lines
Log Message:
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File Contents

# Content
1 #include "urlib.h"
2
3 #include <fcntl.h>
4 #include <stdio.h>
5 #include <string.h>
6 #include <stdlib.h>
7
8 #ifdef _WIN32
9
10 #include <windows.h>
11 //#include <winbase.h>
12 #include <shlobj.h>
13 #include <shlwapi.h>
14 #include <wininet.h>
15
16 static DWORD dword;
17
18 #define u_handle HANDLE
19 #define u_invalid_handle 0
20 #define u_valid(handle) (!!handle)
21
22 #define u_setenv(name,value) SetEnvironmentVariable (name, value)
23 #define u_mkdir(path) !CreateDirectory (path, NULL)
24 #define u_chdir(path) !SetCurrentDirectory (path)
25 #define u_rename(fr,to) !MoveFile (fr, to)
26 #define u_open(path) CreateFile (path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL)
27 #define u_creat(path,exec) CreateFile (path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL)
28 #define u_creat(path,exec) CreateFile (path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL)
29 #define u_close(handle) CloseHandle (handle)
30 #define u_append(path,add) PathAppend (path, add)
31 #define u_write(handle,data,len) (WriteFile (handle, data, len, &dword, 0) ? dword : -1)
32
33 #define u_fsync(handle) FlushFileBuffers (handle)
34 #define u_sync()
35
36 #define u_lockfile(path) CreateFile (path, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)
37 #define u_cloexec(handle)
38
39 #else
40
41 #define _GNU_SOURCE 1
42 #define _BSD_SOURCE 1
43 // the above increases our chances of getting MAP_ANONYMOUS
44
45 #include <sys/mman.h>
46 #include <sys/types.h>
47 #include <sys/stat.h>
48 #include <unistd.h>
49 #include <pwd.h>
50
51 #if defined (MAP_ANON) && !defined (MAP_ANONYMOUS)
52 #define MAP_ANONYMOUS MAP_ANON
53 #endif
54
55 #ifdef PATH_MAX
56 #define MAX_PATH (PATH_MAX < 4096 ? 4096 : PATH_MAX)
57 #else
58 #define MAX_PATH 4096
59 #endif
60
61 #define u_handle int
62 #define u_invalid_handle -1
63 #define u_valid(fd) ((fd) >= 0)
64
65 #define u_setenv(name,value) setenv (name, value, 1)
66 #define u_mkdir(path) mkdir (path, 0777)
67 #define u_chdir(path) chdir (path)
68 #define u_rename(fr,to) rename (fr, to)
69 #define u_open(path) open (path, O_RDONLY)
70 #define u_creat(path,exec) open (path, O_WRONLY | O_CREAT | O_TRUNC, (exec) ? 0777 : 0666)
71 #define u_close(handle) close (handle)
72 #define u_append(path,add) strcat (strcat (path, "/"), add)
73 #define u_write(handle,data,len) write (handle, data, len)
74
75 // on a mostly idle system, a sync at the end is certainly faster, hope for the best
76 #define u_fsync(handle)
77 #define u_sync() sync ()
78
79 #define u_lockfile(path) open (path, O_RDWR | O_CREAT, 0666)
80 #define u_cloexec(handle) fcntl (handle, F_SETFD, FD_CLOEXEC)
81
82 #endif
83
84 #define u_16(ptr) (((ptr)[0] << 8) | (ptr)[1])
85 #define u_32(ptr) (((ptr)[0] << 24) | ((ptr)[1] << 16) | ((ptr)[2] << 8) | (ptr)[3])
86
87 static char currdir[MAX_PATH];
88 static char datadir[MAX_PATH]; // %AppData%/urlader
89 static char exe_dir[MAX_PATH]; // %AppData%/urlader/EXE_ID
90 static char execdir[MAX_PATH]; // %AppData%/urlader/EXE_ID/EXE_VER
91 static char exe_id[MAX_PATH];
92 static char exe_ver[MAX_PATH];
93
94 /////////////////////////////////////////////////////////////////////////////
95
96 static void
97 u_fatal (const char *msg)
98 {
99 #ifdef _WIN32
100 MessageBox (0, msg, URLADER, 0);
101 #else
102 write (2, URLADER ": ", sizeof (URLADER ": ") - 1);
103 write (2, msg, strlen (msg));
104 write (2, "\n", 1);
105 #endif
106
107 _exit (1);
108 }
109
110 static void *
111 u_malloc (unsigned int size)
112 {
113 void *addr;
114
115 #ifdef _WIN32
116 HANDLE handle = CreateFileMapping (0, 0, PAGE_READWRITE, 0, size, NULL);
117
118 if (!handle)
119 return 0;
120
121 addr = MapViewOfFile (handle, FILE_MAP_WRITE, 0, 0, size);
122
123 CloseHandle (handle);
124 #elif defined (MAP_ANONYMOUS)
125 addr = mmap (0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
126
127 if (addr == (void *)-1)
128 addr = 0;
129 #else
130 addr = malloc (size);
131 #endif
132
133 return addr;
134 }
135
136 static void
137 u_free (void *addr, unsigned int size)
138 {
139 #ifdef _WIN32
140 UnmapViewOfFile (addr);
141 #elif defined (MAP_ANONYMOUS)
142 munmap (addr, size);
143 #else
144 free (addr);
145 #endif
146 }
147
148 static void *
149 u_mmap (u_handle h, unsigned int size)
150 {
151 void *addr;
152
153 #ifdef _WIN32
154 HANDLE handle = CreateFileMapping (h, 0, PAGE_READONLY, 0, size, NULL);
155
156 if (!handle)
157 return 0;
158
159 addr = MapViewOfFile (handle, FILE_MAP_READ, 0, 0, size);
160
161 CloseHandle (handle);
162 #else
163 addr = mmap (0, size, PROT_READ, MAP_SHARED, h, 0);
164
165 if (addr == (void *)-1)
166 addr = 0;
167 #endif
168
169 return addr;
170 }
171
172 static void
173 u_munmap (void *addr, unsigned int len)
174 {
175 #ifdef _WIN32
176 UnmapViewOfFile (addr);
177 #else
178 munmap (addr, len);
179 #endif
180 }
181
182 /////////////////////////////////////////////////////////////////////////////
183
184 static void
185 u_set_datadir (void)
186 {
187 #ifdef _WIN32
188 if (SHGetFolderPath (0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, NULL, SHGFP_TYPE_CURRENT, datadir) != S_OK)
189 u_fatal ("unable to find application data directory");
190
191 u_mkdir (datadir);
192 u_append (datadir, URLADER);
193
194 #else
195 char *home = getenv ("HOME");
196
197 if (!home)
198 {
199 struct passwd *pw;
200
201 if ((pw = getpwuid (getuid ())))
202 home = pw->pw_dir;
203 else
204 home = "/tmp";
205 }
206
207 u_mkdir (home);
208 //strcat (strcat (strcpy (datadir, home), "/."), URLADER);
209 sprintf (datadir, "%s/.%s", home, URLADER);
210 #endif
211
212 u_setenv ("URLADER_DATADIR", datadir);
213 }
214
215 static void
216 u_set_exe_info (void)
217 {
218 strcpy (exe_dir, datadir);
219 u_append (exe_dir, exe_id);
220 u_mkdir (exe_dir);
221
222 strcpy (execdir, exe_dir);
223 u_append (execdir, "i-");
224 strcat (execdir, exe_ver);
225
226 u_setenv ("URLADER_EXECDIR", execdir);
227 u_setenv ("URLADER_EXE_ID" , exe_id);
228 u_setenv ("URLADER_EXE_DIR", exe_dir);
229 u_setenv ("URLADER_EXE_VER", exe_ver);
230 }
231
232 /////////////////////////////////////////////////////////////////////////////
233
234 static u_handle
235 u_lock (const char *path, int excl, int dowait)
236 {
237 u_handle h;
238
239 h = u_lockfile (path);
240 if (!u_valid (h))
241 return h;
242
243 u_cloexec (h);
244
245 for (;;)
246 {
247 int success;
248
249 // acquire the lock
250 #ifdef _WIN32
251 OVERLAPPED ov = { 0 };
252
253 success = LockFileEx (h,
254 (excl ? LOCKFILE_EXCLUSIVE_LOCK : 0)
255 | (dowait ? 0 : LOCKFILE_FAIL_IMMEDIATELY),
256 0,
257 1, 0,
258 &ov);
259 #else
260 struct flock lck = { 0 };
261
262 lck.l_type = excl ? F_WRLCK : F_RDLCK;
263 lck.l_whence = SEEK_SET;
264 lck.l_len = 1;
265
266 success = !fcntl (h, dowait ? F_SETLKW : F_SETLK, &lck);
267 #endif
268
269 if (!success)
270 break;
271
272 // we have the lock, now verify that the lockfile still exists
273
274 #ifdef _WIN32
275 // apparently, we have to open the file to get its info :(
276 {
277 BY_HANDLE_FILE_INFORMATION s1, s2;
278 u_handle h2 = u_lockfile (path);
279 if (!u_valid (h))
280 break;
281
282 success = GetFileInformationByHandle (h, &s1)
283 && GetFileInformationByHandle (h2, &s2);
284
285 u_close (h2);
286
287 if (!success)
288 break;
289
290 success = s1.dwVolumeSerialNumber == s2.dwVolumeSerialNumber
291 && s1.nFileIndexHigh == s2.nFileIndexHigh
292 && s1.nFileIndexLow == s2.nFileIndexLow;
293 }
294 #else
295 struct stat s1, s2;
296
297 if (fstat (h, &s1) || stat (path, &s2))
298 break;
299
300 success = s1.st_dev == s2.st_dev
301 && s1.st_ino == s2.st_ino;
302 #endif
303
304 if (success)
305 return h; // lock successfully acquired
306
307 // files differ, close and retry - should be very rare
308 u_close (h);
309 }
310
311 // failure
312 u_close (h);
313 return u_invalid_handle;
314 }
315