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