Annotation of parser3/src/classes/math.C, revision 1.37
1.1 parser 1: /** @file
2: Parser: @b math parser class.
3:
1.34 paf 4: Copyright(c) 2001-2003 ArtLebedev Group(http://www.artlebedev.com)
1.20 paf 5: Author: Alexandr Petrosian <paf@design.ru>(http://paf.design.ru)
1.28 paf 6:
7: portions from gen_uuid.c,
8: Copyright (C) 1996, 1997, 1998, 1999 Theodore Ts'o.
1.22 paf 9: */
1.1 parser 10:
1.37 ! paf 11: static const char * const IDENT_MATH_C="$Date: 2003/11/20 16:34:23 $";
1.1 parser 12:
1.34 paf 13: #include "pa_vmethod_frame.h"
1.1 parser 14: #include "pa_common.h"
15: #include "pa_vint.h"
1.2 parser 16: #include "pa_vmath.h"
1.1 parser 17: #include "pa_request.h"
1.19 paf 18: #include "pa_md5.h"
1.28 paf 19: #include "pa_threads.h"
1.1 parser 20:
1.5 parser 21: #ifdef WIN32
1.28 paf 22: # define _WIN32_WINNT 0x400
1.5 parser 23: # include <windows.h>
1.28 paf 24: # include <wincrypt.h>
1.5 parser 25: #endif
26:
1.34 paf 27: #ifdef HAVE_CRYPT
28: # ifdef HAVE_CRYPT_H
29: # include <crypt.h>
30: # endif
31: #else
32: extern char *crypt(const char* , const char* );
1.20 paf 33: #endif
34:
1.1 parser 35: // defines
36:
1.20 paf 37: #define MAX_SALT 8
1.1 parser 38:
39: // class
40:
1.34 paf 41: class MMath: public Methoded {
1.1 parser 42: public:
1.34 paf 43: MMath();
1.5 parser 44:
1.1 parser 45: public: // Methoded
1.15 paf 46: bool used_directly() { return false; }
1.1 parser 47: };
48:
1.34 paf 49: // global variables
50:
51: DECLARE_CLASS_VAR(math, 0 /*fictive*/, new MMath);
52:
1.28 paf 53: #ifdef WIN32
54: class Random_provider {
55: HCRYPTPROV fhProv;
56:
57: void acquire() {
58: SYNCHRONIZED;
59:
60: if(fhProv)
61: return;
62:
63: if(!CryptAcquireContext(&fhProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
64: throw Exception(0,
65: 0,
66: "CryptAcquireContext failed");
67: }
68: void release() {
69: if(fhProv)
70: CryptReleaseContext(fhProv, 0);
71: }
72:
73: public:
74: Random_provider(): fhProv(0) {}
75: ~Random_provider() { release(); }
76: void generate(void *buffer, size_t size) {
77: acquire();
78:
79: if(!CryptGenRandom(fhProv, size, (BYTE*)buffer))
80: throw Exception(0,
81: 0,
82: "CryptGenRandom failed");
83: }
84: }
85: random_provider;
86:
87: #else
88:
89: /// from gen_uuid.c
90: static int get_random_fd(void)
91: {
92: struct timeval tv;
93: static int fd = -2;
94: int i;
95:
96: if (fd == -2) {
97: gettimeofday(&tv, 0);
98: fd = open("/dev/urandom", O_RDONLY);
99: if (fd == -1)
100: fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
101: srand((getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec);
102: }
103: /* Crank the random number generator a few times */
104: gettimeofday(&tv, 0);
105: for (i = (tv.tv_sec ^ tv.tv_usec) & 0x1F; i > 0; i--)
106: rand();
107: return fd;
108: }
109:
110:
111: /*
112: * Generate a series of random bytes. Use /dev/urandom if possible,
113: * and if not, use srandom/random.
114: */
115: static void get_random_bytes(void *buf, int nbytes)
116: {
117: int i, fd = get_random_fd();
118: int lose_counter = 0;
119: char *cp = (char *) buf;
120:
121: if (fd >= 0) {
122: while (nbytes > 0) {
123: i = read(fd, cp, nbytes);
124: if (i <= 0) {
125: if (lose_counter++ > 16)
126: break;
127: continue;
128: }
129: nbytes -= i;
130: cp += i;
131: lose_counter = 0;
132: }
133: }
134:
135: /* XXX put something better here if no /dev/random! */
136: for (i = 0; i < nbytes; i++)
137: *cp++ = rand() & 0xFF;
138: return;
139: }
140:
141:
142: #endif
143:
144:
145: // helpers
146:
147: static void random(void *buffer, size_t size) {
148: #ifdef WIN32
149: random_provider.generate(buffer, size);
150: #else
151: get_random_bytes(buffer, size);
152: #endif
153: }
154:
1.34 paf 155:
1.1 parser 156: // methods
1.34 paf 157:
158: #define MAX_UINT 0xFFFFFFFFu
159:
1.20 paf 160: static inline int _random(uint top) {
1.28 paf 161: uint raw;
162: random(&raw, sizeof(raw));
1.34 paf 163: return int(double(raw) / MAX_UINT * top );
1.20 paf 164: }
1.1 parser 165:
1.34 paf 166: static void _random(Request& r, MethodParams& params) {
167: Value& range=params.as_junction(0, "range must be expression");
1.25 paf 168: double top=r.process_to_value(range).as_double();
1.34 paf 169: if(top<=0 || top>MAX_UINT)
1.16 paf 170: throw Exception("parser.runtime",
1.34 paf 171: 0,
172: "top(%g) must be [1..%u]", top, MAX_UINT);
1.1 parser 173:
1.34 paf 174: r.write_no_lang(*new VInt(_random(uint(top))));
1.1 parser 175: }
176:
177:
1.20 paf 178: typedef double(*math1_func_ptr)(double);
1.3 parser 179: static double frac(double param) { return param-trunc(param); }
180: static double degrees(double param) { return param /PI *180; }
181: static double radians(double param) { return param /180 *PI; }
1.1 parser 182:
1.34 paf 183: static void math1(Request& r, MethodParams& params, math1_func_ptr func) {
184: Value& param=params.as_junction(0, "parameter must be expression");
1.1 parser 185:
1.34 paf 186: double result=func(r.process_to_value(param).as_double());
187: r.write_no_lang(*new VDouble(result));
1.1 parser 188: }
189:
190: #define MATH1(name) \
1.34 paf 191: static void _##name(Request& r, MethodParams& params) {\
192: math1(r, params, &name);\
1.1 parser 193: }
194: #define MATH1P(name_parser, name_c) \
1.34 paf 195: static void _##name_parser(Request& r, MethodParams& params) {\
196: math1(r, params, &name_c);\
1.1 parser 197: }
198: MATH1(round); MATH1(floor); MATH1P(ceiling, ceil);
1.3 parser 199: MATH1(trunc); MATH1(frac);
1.1 parser 200: MATH1P(abs, fabs); MATH1(sign);
201: MATH1(exp); MATH1(log);
202: MATH1(sin); MATH1(asin);
203: MATH1(cos); MATH1(acos);
204: MATH1(tan); MATH1(atan);
1.3 parser 205: MATH1(degrees); MATH1(radians);
1.1 parser 206: MATH1(sqrt);
207:
208:
209: typedef double (*math2_func_ptr)(double, double);
1.34 paf 210: static void math2(Request& r, MethodParams& params, math2_func_ptr func) {
211: Value& a=params.as_junction(0, "parameter must be expression");
212: Value& b=params.as_junction(1, "parameter must be expression");
1.1 parser 213:
1.34 paf 214: double result=func(
1.17 paf 215: r.process_to_value(a).as_double(),
1.18 paf 216: r.process_to_value(b).as_double());
1.34 paf 217: r.write_no_lang(*new VDouble(result));
1.1 parser 218: }
219:
220: #define MATH2(name) \
1.34 paf 221: static void _##name(Request& r, MethodParams& params) {\
222: math2(r, params, &name);\
1.1 parser 223: }
224: MATH2(pow);
225:
1.20 paf 226: inline bool is_salt_body_char(int c) {
227: return isalnum(c) || c == '.' || c=='/';
228: }
1.34 paf 229: static size_t calc_prefix_size(const char* salt) {
1.37 ! paf 230: if(strlen(salt)) {
1.20 paf 231: if(!is_salt_body_char(salt[0])) { // $... {...
1.34 paf 232: const char* cur=salt+1; // skip
1.20 paf 233: while(is_salt_body_char(*cur++)) // ...$ ...}
234: ;
235: return cur-salt;
236: } else
237: return 0;
238: } else
239: return 0;
240: }
1.34 paf 241: static void _crypt(Request& r, MethodParams& params) {
242: const char* password=params.as_string(0, "password must be string").cstr();
243: const char* maybe_bodyless_salt=params.as_string(1, "salt must be string").cstr();
1.20 paf 244:
245: size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
1.34 paf 246: const char* normal_salt;
1.20 paf 247: char normalize_buf[MAX_STRING];
248: if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
249: strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
250: char *cur=normalize_buf+strlen(normalize_buf);
251: // sould add up MAX_SALT random chars
252: static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
253: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
254: for(int i=0; i<MAX_SALT; i++)
255: *cur++=itoa64[_random(64)];
256: *cur=0;
257: normal_salt=normalize_buf;
258: } else
259: normal_salt=maybe_bodyless_salt;
1.19 paf 260:
261: /* FreeBSD style MD5 string
262: */
1.20 paf 263: if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
1.19 paf 264: const size_t sample_size=120;
1.34 paf 265: char *sample_buf=new(PointerFreeGC) char[sample_size];
266: pa_MD5Encode((const unsigned char *)password,
267: (const unsigned char *)normal_salt, sample_buf, sample_size);
268: String sample(sample_buf);
269: r.write_pass_lang(sample);
1.20 paf 270: } else {
271: #ifdef HAVE_CRYPT
1.34 paf 272: const char* static_sample_buf=crypt(password, normal_salt);
273: if(!static_sample_buf // nothing generated
274: || !static_sample_buf[0] // generated nothing
275: || strncmp(static_sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
1.20 paf 276: throw Exception("parser.runtime",
1.34 paf 277: 0,
278: "crypt on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
1.20 paf 279:
1.34 paf 280: r.write_pass_lang(String(pa_strdup(static_sample_buf)));
1.20 paf 281: #else
1.19 paf 282: throw Exception("parser.runtime",
1.34 paf 283: 0,
1.19 paf 284: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 285: #endif
286: }
1.19 paf 287: }
288:
1.34 paf 289: static const char* hex_string(unsigned char* bytes, size_t size, bool upcase) {
290: char *bytes_hex=new(PointerFreeGC) char [size*2/*byte->hh*/+1/*for zero-teminator*/];
1.30 paf 291: unsigned char *src=bytes;
292: unsigned char *end=bytes+size;
293: char *dest=bytes_hex;
1.31 paf 294:
295: static const char *hex=upcase?"0123456789ABCDEF":"0123456789abcdef";
296:
297: for(; src<end; src++) {
298: *dest++=hex[*src/0x10];
299: *dest++=hex[*src%0x10];
300: }
301: *dest=0;
1.30 paf 302:
303: return bytes_hex;
304: }
305:
1.34 paf 306: static void _md5(Request& r, MethodParams& params) {
307: const char *string=params.as_string(0, "parameter must be string").cstr();
1.27 paf 308:
309:
310: PA_MD5_CTX context;
311: unsigned char digest[16];
1.34 paf 312: pa_MD5Init(&context);
313: pa_MD5Update(&context, (const unsigned char*)string, strlen(string));
314: pa_MD5Final(digest, &context);
1.27 paf 315:
1.34 paf 316: r.write_pass_lang(*new String(hex_string(digest, sizeof(digest), false)));
1.26 paf 317: }
318:
1.28 paf 319: /// to hell with extra bytes on 64bit platforms
320: struct uuid {
321: unsigned int time_low;
322: unsigned short time_mid;
323: unsigned short time_hi_and_version;
324: unsigned short clock_seq;
325: unsigned char node[6];
326: };
1.34 paf 327: static void _uuid(Request& r, MethodParams& /*params*/) {
1.28 paf 328:
329: // random
330: struct uuid uuid;
331: random(&uuid, sizeof(uuid));
332:
333: // http://www.opengroup.org/onlinepubs/9629399/apdxa.htm#tagtcjh_35
334: // ~
335: // version = DCE Security version, with embedded POSIX UIDs.
336: // variant = DCE
337: //
338: // DCE=Distributed Computing Environment
339: // http://www.opengroup.org/dce/
340: //
341: // they say this influences comparison&such,
342: // but could not figure out how, hence structure layout specified strictly
343: // anyhow, uuidgen on Win32 yield those values
344: //
345: // xxxxxxxx-xxxx-4xxx-{8,9,A,B}xxx-xxxxxxxxxxxx
346: uuid.clock_seq = (uuid.clock_seq & 0x3FFF) | 0x8000;
347: uuid.time_hi_and_version = (uuid.time_hi_and_version & 0x0FFF) | 0x4000;
348:
349: // format
1.34 paf 350: const int uuid_cstr_bufsize=36+1/*for zero-teminator*/+1/*for faulty snprintfs*/;
351: char *uuid_cstr=new(PointerFreeGC) char[uuid_cstr_bufsize];
1.29 paf 352: snprintf(uuid_cstr, uuid_cstr_bufsize,
1.28 paf 353: "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
354: uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
355: uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
356: uuid.node[0], uuid.node[1], uuid.node[2],
357: uuid.node[3], uuid.node[4], uuid.node[5]);
358:
1.34 paf 359: r.write_pass_lang(*new String(uuid_cstr));
1.28 paf 360: }
361:
1.34 paf 362: static void _uid64(Request& r, MethodParams& /*params*/) {
1.30 paf 363:
364: unsigned char id[64/8];
365: random(&id, sizeof(id));
366:
1.34 paf 367: r.write_pass_lang(*new String(hex_string(id, sizeof(id), true)));
1.30 paf 368: }
369:
1.1 parser 370: // constructor
371:
1.34 paf 372: MMath::MMath(): Methoded("math") {
1.1 parser 373: // ^FUNC(expr)
1.28 paf 374: #define ADDX(name, X) \
375: add_native_method(#name, Method::CT_STATIC, _##name, X, X)
376: #define ADD0(name) ADDX(name, 0)
377: #define ADD1(name) ADDX(name, 1)
378: #define ADD2(name) ADDX(name, 2)
1.1 parser 379:
380: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 381: ADD1(trunc); ADD1(frac);
1.1 parser 382: ADD1(abs); ADD1(sign);
383: ADD1(exp); ADD1(log);
384: ADD1(sin); ADD1(asin);
385: ADD1(cos); ADD1(acos);
386: ADD1(tan); ADD1(atan);
1.3 parser 387: ADD1(degrees); ADD1(radians);
1.1 parser 388: ADD1(sqrt);
1.3 parser 389: ADD1(random);
1.1 parser 390:
391: // ^pow(x;y)
392: ADD2(pow);
393:
1.19 paf 394: // ^crypt[password;salt]
395: ADD2(crypt);
1.26 paf 396:
397: // ^md5[string]
398: ADD1(md5);
1.5 parser 399:
1.29 paf 400: // ^uuid[]
401: ADD0(uuid);
402:
1.30 paf 403: // ^uid64[]
404: ADD0(uid64);
1.1 parser 405: }
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