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1 | /* |
2 | * winmisc.c: miscellaneous Windows-specific things. |
3 | */ |
4 | |
5 | #include <windows.h> |
6 | #include <stdio.h> |
7 | #include <stdlib.h> |
8 | #include "putty.h" |
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9 | #include "winstuff.h" |
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10 | |
11 | void platform_get_x11_auth(char *display, int *proto, |
12 | unsigned char *data, int *datalen) |
13 | { |
14 | /* We don't support this at all under Windows. */ |
15 | } |
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16 | |
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17 | Filename filename_from_str(const char *str) |
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18 | { |
19 | Filename ret; |
20 | strncpy(ret.path, str, sizeof(ret.path)); |
21 | ret.path[sizeof(ret.path)-1] = '\0'; |
22 | return ret; |
23 | } |
24 | |
9fab77dc |
25 | const char *filename_to_str(const Filename *fn) |
9a30e26b |
26 | { |
9fab77dc |
27 | return fn->path; |
9a30e26b |
28 | } |
29 | |
30 | int filename_equal(Filename f1, Filename f2) |
31 | { |
32 | return !strcmp(f1.path, f2.path); |
33 | } |
34 | |
35 | int filename_is_null(Filename fn) |
36 | { |
37 | return !*fn.path; |
38 | } |
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39 | |
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40 | int SaneDialogBox(HINSTANCE hinst, |
41 | LPCTSTR tmpl, |
42 | HWND hwndparent, |
43 | DLGPROC lpDialogFunc) |
44 | { |
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45 | WNDCLASS wc; |
46 | HWND hwnd; |
8ee3ff16 |
47 | MSG msg; |
2979718a |
48 | int flags; |
49 | int ret; |
5e9e124a |
50 | int gm; |
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51 | |
52 | wc.style = CS_DBLCLKS | CS_SAVEBITS | CS_BYTEALIGNWINDOW; |
53 | wc.lpfnWndProc = DefDlgProc; |
54 | wc.cbClsExtra = 0; |
55 | wc.cbWndExtra = DLGWINDOWEXTRA + 8; |
56 | wc.hInstance = hinst; |
57 | wc.hIcon = NULL; |
58 | wc.hCursor = LoadCursor(NULL, IDC_ARROW); |
59 | wc.hbrBackground = (HBRUSH) (COLOR_BACKGROUND +1); |
60 | wc.lpszMenuName = NULL; |
61 | wc.lpszClassName = "PuTTYConfigBox"; |
62 | RegisterClass(&wc); |
63 | |
64 | hwnd = CreateDialog(hinst, tmpl, hwndparent, lpDialogFunc); |
65 | |
66 | SetWindowLong(hwnd, BOXFLAGS, 0); /* flags */ |
67 | SetWindowLong(hwnd, BOXRESULT, 0); /* result from SaneEndDialog */ |
68 | |
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69 | while ((gm=GetMessage(&msg, NULL, 0, 0)) > 0) { |
2979718a |
70 | flags=GetWindowLong(hwnd, BOXFLAGS); |
71 | if (!(flags & DF_END) && !IsDialogMessage(hwnd, &msg)) |
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72 | DispatchMessage(&msg); |
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73 | if (flags & DF_END) |
74 | break; |
8ee3ff16 |
75 | } |
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76 | |
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77 | if (gm == 0) |
78 | PostQuitMessage(msg.wParam); /* We got a WM_QUIT, pass it on */ |
79 | |
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80 | ret=GetWindowLong(hwnd, BOXRESULT); |
81 | DestroyWindow(hwnd); |
82 | return ret; |
8ee3ff16 |
83 | } |
84 | |
85 | void SaneEndDialog(HWND hwnd, int ret) |
86 | { |
2979718a |
87 | SetWindowLong(hwnd, BOXRESULT, ret); |
88 | SetWindowLong(hwnd, BOXFLAGS, DF_END); |
8ee3ff16 |
89 | } |
90 | |
d0912d1f |
91 | #ifdef DEBUG |
92 | static FILE *debug_fp = NULL; |
93 | static HANDLE debug_hdl = INVALID_HANDLE_VALUE; |
94 | static int debug_got_console = 0; |
95 | |
96 | void dputs(char *buf) |
97 | { |
98 | DWORD dw; |
99 | |
100 | if (!debug_got_console) { |
101 | if (AllocConsole()) { |
102 | debug_got_console = 1; |
103 | debug_hdl = GetStdHandle(STD_OUTPUT_HANDLE); |
104 | } |
105 | } |
106 | if (!debug_fp) { |
107 | debug_fp = fopen("debug.log", "w"); |
108 | } |
109 | |
110 | if (debug_hdl != INVALID_HANDLE_VALUE) { |
111 | WriteFile(debug_hdl, buf, strlen(buf), &dw, NULL); |
112 | } |
113 | fputs(buf, debug_fp); |
114 | fflush(debug_fp); |
115 | } |
116 | #endif |
117 | |
118 | #ifdef MINEFIELD |
119 | /* |
120 | * Minefield - a Windows equivalent for Electric Fence |
121 | */ |
122 | |
123 | #define PAGESIZE 4096 |
124 | |
125 | /* |
126 | * Design: |
127 | * |
128 | * We start by reserving as much virtual address space as Windows |
129 | * will sensibly (or not sensibly) let us have. We flag it all as |
130 | * invalid memory. |
131 | * |
132 | * Any allocation attempt is satisfied by committing one or more |
133 | * pages, with an uncommitted page on either side. The returned |
134 | * memory region is jammed up against the _end_ of the pages. |
135 | * |
136 | * Freeing anything causes instantaneous decommitment of the pages |
137 | * involved, so stale pointers are caught as soon as possible. |
138 | */ |
139 | |
140 | static int minefield_initialised = 0; |
141 | static void *minefield_region = NULL; |
142 | static long minefield_size = 0; |
143 | static long minefield_npages = 0; |
144 | static long minefield_curpos = 0; |
145 | static unsigned short *minefield_admin = NULL; |
146 | static void *minefield_pages = NULL; |
147 | |
148 | static void minefield_admin_hide(int hide) |
149 | { |
150 | int access = hide ? PAGE_NOACCESS : PAGE_READWRITE; |
151 | VirtualProtect(minefield_admin, minefield_npages * 2, access, NULL); |
152 | } |
153 | |
154 | static void minefield_init(void) |
155 | { |
156 | int size; |
157 | int admin_size; |
158 | int i; |
159 | |
160 | for (size = 0x40000000; size > 0; size = ((size >> 3) * 7) & ~0xFFF) { |
161 | minefield_region = VirtualAlloc(NULL, size, |
162 | MEM_RESERVE, PAGE_NOACCESS); |
163 | if (minefield_region) |
164 | break; |
165 | } |
166 | minefield_size = size; |
167 | |
168 | /* |
169 | * Firstly, allocate a section of that to be the admin block. |
170 | * We'll need a two-byte field for each page. |
171 | */ |
172 | minefield_admin = minefield_region; |
173 | minefield_npages = minefield_size / PAGESIZE; |
174 | admin_size = (minefield_npages * 2 + PAGESIZE - 1) & ~(PAGESIZE - 1); |
175 | minefield_npages = (minefield_size - admin_size) / PAGESIZE; |
176 | minefield_pages = (char *) minefield_region + admin_size; |
177 | |
178 | /* |
179 | * Commit the admin region. |
180 | */ |
181 | VirtualAlloc(minefield_admin, minefield_npages * 2, |
182 | MEM_COMMIT, PAGE_READWRITE); |
183 | |
184 | /* |
185 | * Mark all pages as unused (0xFFFF). |
186 | */ |
187 | for (i = 0; i < minefield_npages; i++) |
188 | minefield_admin[i] = 0xFFFF; |
189 | |
190 | /* |
191 | * Hide the admin region. |
192 | */ |
193 | minefield_admin_hide(1); |
194 | |
195 | minefield_initialised = 1; |
196 | } |
197 | |
198 | static void minefield_bomb(void) |
199 | { |
200 | div(1, *(int *) minefield_pages); |
201 | } |
202 | |
203 | static void *minefield_alloc(int size) |
204 | { |
205 | int npages; |
206 | int pos, lim, region_end, region_start; |
207 | int start; |
208 | int i; |
209 | |
210 | npages = (size + PAGESIZE - 1) / PAGESIZE; |
211 | |
212 | minefield_admin_hide(0); |
213 | |
214 | /* |
215 | * Search from current position until we find a contiguous |
216 | * bunch of npages+2 unused pages. |
217 | */ |
218 | pos = minefield_curpos; |
219 | lim = minefield_npages; |
220 | while (1) { |
221 | /* Skip over used pages. */ |
222 | while (pos < lim && minefield_admin[pos] != 0xFFFF) |
223 | pos++; |
224 | /* Count unused pages. */ |
225 | start = pos; |
226 | while (pos < lim && pos - start < npages + 2 && |
227 | minefield_admin[pos] == 0xFFFF) |
228 | pos++; |
229 | if (pos - start == npages + 2) |
230 | break; |
231 | /* If we've reached the limit, reset the limit or stop. */ |
232 | if (pos >= lim) { |
233 | if (lim == minefield_npages) { |
234 | /* go round and start again at zero */ |
235 | lim = minefield_curpos; |
236 | pos = 0; |
237 | } else { |
238 | minefield_admin_hide(1); |
239 | return NULL; |
240 | } |
241 | } |
242 | } |
243 | |
244 | minefield_curpos = pos - 1; |
245 | |
246 | /* |
247 | * We have npages+2 unused pages starting at start. We leave |
248 | * the first and last of these alone and use the rest. |
249 | */ |
250 | region_end = (start + npages + 1) * PAGESIZE; |
251 | region_start = region_end - size; |
252 | /* FIXME: could align here if we wanted */ |
253 | |
254 | /* |
255 | * Update the admin region. |
256 | */ |
257 | for (i = start + 2; i < start + npages + 1; i++) |
258 | minefield_admin[i] = 0xFFFE; /* used but no region starts here */ |
259 | minefield_admin[start + 1] = region_start % PAGESIZE; |
260 | |
261 | minefield_admin_hide(1); |
262 | |
263 | VirtualAlloc((char *) minefield_pages + region_start, size, |
264 | MEM_COMMIT, PAGE_READWRITE); |
265 | return (char *) minefield_pages + region_start; |
266 | } |
267 | |
268 | static void minefield_free(void *ptr) |
269 | { |
270 | int region_start, i, j; |
271 | |
272 | minefield_admin_hide(0); |
273 | |
274 | region_start = (char *) ptr - (char *) minefield_pages; |
275 | i = region_start / PAGESIZE; |
276 | if (i < 0 || i >= minefield_npages || |
277 | minefield_admin[i] != region_start % PAGESIZE) |
278 | minefield_bomb(); |
279 | for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++) { |
280 | minefield_admin[j] = 0xFFFF; |
281 | } |
282 | |
283 | VirtualFree(ptr, j * PAGESIZE - region_start, MEM_DECOMMIT); |
284 | |
285 | minefield_admin_hide(1); |
286 | } |
287 | |
288 | static int minefield_get_size(void *ptr) |
289 | { |
290 | int region_start, i, j; |
291 | |
292 | minefield_admin_hide(0); |
293 | |
294 | region_start = (char *) ptr - (char *) minefield_pages; |
295 | i = region_start / PAGESIZE; |
296 | if (i < 0 || i >= minefield_npages || |
297 | minefield_admin[i] != region_start % PAGESIZE) |
298 | minefield_bomb(); |
299 | for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++); |
300 | |
301 | minefield_admin_hide(1); |
302 | |
303 | return j * PAGESIZE - region_start; |
304 | } |
305 | |
306 | void *minefield_c_malloc(size_t size) |
307 | { |
308 | if (!minefield_initialised) |
309 | minefield_init(); |
310 | return minefield_alloc(size); |
311 | } |
312 | |
313 | void minefield_c_free(void *p) |
314 | { |
315 | if (!minefield_initialised) |
316 | minefield_init(); |
317 | minefield_free(p); |
318 | } |
319 | |
320 | /* |
321 | * realloc _always_ moves the chunk, for rapid detection of code |
322 | * that assumes it won't. |
323 | */ |
324 | void *minefield_c_realloc(void *p, size_t size) |
325 | { |
326 | size_t oldsize; |
327 | void *q; |
328 | if (!minefield_initialised) |
329 | minefield_init(); |
330 | q = minefield_alloc(size); |
331 | oldsize = minefield_get_size(p); |
332 | memcpy(q, p, (oldsize < size ? oldsize : size)); |
333 | minefield_free(p); |
334 | return q; |
335 | } |
336 | |
337 | #endif /* MINEFIELD */ |