Annotation of parser3/src/main/pa_random.C, revision 1.11
1.1 misha 1: /** @file
2: Parser: random related functions.
3:
1.10 moko 4: Copyright (c) 2001-2020 Art. Lebedev Studio (http://www.artlebedev.com)
1.1 misha 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
6: */
7:
8: // includes
9:
1.8 moko 10: #include "pa_common.h"
1.1 misha 11: #include "pa_random.h"
12: #include "pa_exception.h"
13: #include "pa_threads.h"
14:
1.11 ! moko 15: volatile const char * IDENT_PA_RANDOM_C="$Id: pa_random.C,v 1.10 2020/12/15 17:10:36 moko Exp $" IDENT_PA_RANDOM_H;
1.3 moko 16:
1.5 moko 17: #ifdef _MSC_VER
1.4 moko 18: #include <windows.h>
1.1 misha 19:
20: class Random_provider {
21: HCRYPTPROV fhProv;
22:
23: void acquire() {
24: SYNCHRONIZED;
25:
26: if(fhProv)
27: return;
28:
29: if(!CryptAcquireContext(&fhProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
1.7 moko 30: throw Exception(0, 0, "CryptAcquireContext failed");
1.1 misha 31: }
32: void release() {
33: if(fhProv)
34: CryptReleaseContext(fhProv, 0);
35: }
36:
37: public:
38: Random_provider(): fhProv(0) {}
39: ~Random_provider() { release(); }
40: void generate(void *buffer, size_t size) {
41: acquire();
42:
43: if(!CryptGenRandom(fhProv, size, (BYTE*)buffer))
1.7 moko 44: throw Exception(0, 0, "CryptGenRandom failed");
1.1 misha 45: }
46: }
47: random_provider;
48:
49: #else
50:
51: /// from gen_uuid.c
52: static int get_random_fd(void)
53: {
54: struct timeval tv;
55: static int fd = -2;
56: int i;
57:
58: if (fd == -2) {
59: gettimeofday(&tv, 0);
60: fd = open("/dev/urandom", O_RDONLY);
61: if (fd == -1)
62: fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
63: srand((getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec);
64: }
65: /* Crank the random number generator a few times */
66: gettimeofday(&tv, 0);
67: for (i = (tv.tv_sec ^ tv.tv_usec) & 0x1F; i > 0; i--)
68: rand();
69: return fd;
70: }
71:
72:
73: /*
74: * Generate a series of random bytes. Use /dev/urandom if possible,
75: * and if not, use srandom/random.
76: */
77: static void get_random_bytes(void *buf, int nbytes)
78: {
79: int i, fd = get_random_fd();
80: int lose_counter = 0;
81: char *cp = (char *) buf;
82:
83: if (fd >= 0) {
84: while (nbytes > 0) {
85: i = read(fd, cp, nbytes);
86: if (i <= 0) {
87: if (lose_counter++ > 16)
88: break;
89: continue;
90: }
91: nbytes -= i;
92: cp += i;
93: lose_counter = 0;
94: }
95: }
96:
97: /* XXX put something better here if no /dev/random! */
98: for (i = 0; i < nbytes; i++)
99: *cp++ = rand() & 0xFF;
100: return;
101: }
102:
103:
104: #endif
105:
106: void random(void *buffer, size_t size) {
1.5 moko 107: #ifdef _MSC_VER
1.1 misha 108: random_provider.generate(buffer, size);
109: #else
110: get_random_bytes(buffer, size);
111: #endif
112: }
113:
1.7 moko 114: /// to hell with extra bytes on 64bit platforms
115: struct uuid {
116: unsigned int time_low;
117: unsigned short time_mid;
118: unsigned short time_hi_and_version;
119: unsigned short clock_seq;
120: unsigned char node[6];
121: };
122:
123: static uuid get_uuid() {
1.1 misha 124: // random
125: uuid uuid;
126: random(&uuid, sizeof(uuid));
127:
128: // http://www.opengroup.org/onlinepubs/9629399/apdxa.htm#tagtcjh_35
129: // ~
130: // version = DCE Security version, with embedded POSIX UIDs.
131: // variant = DCE
132: //
133: // DCE=Distributed Computing Environment
134: // http://www.opengroup.org/dce/
135: //
136: // they say this influences comparison&such,
137: // but could not figure out how, hence structure layout specified strictly
138: // anyhow, uuidgen on Win32 yield those values
139: //
140: // xxxxxxxx-xxxx-4xxx-{8,9,A,B}xxx-xxxxxxxxxxxx
141: uuid.clock_seq = (uuid.clock_seq & 0x3FFF) | 0x8000;
142: uuid.time_hi_and_version = (uuid.time_hi_and_version & 0x0FFF) | 0x4000;
143:
144: return uuid;
145: }
146:
1.11 ! moko 147: char *get_uuid_cstr(bool lower, bool solid) {
1.7 moko 148: uuid uuid=get_uuid();
149:
150: const size_t bufsize=36+1/*zero-teminator*/+1/*for faulty snprintfs*/;
151: char* cstr=new(PointerFreeGC) char[bufsize];
152:
1.11 ! moko 153: const char *format[] = {
! 154: "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
! 155: "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
! 156: "%08X%04X%04X%02X%02X%02X%02X%02X%02X%02X%02X",
! 157: "%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x"
! 158: };
! 159:
1.7 moko 160: snprintf(cstr, bufsize,
1.11 ! moko 161: format[(lower ? 1:0) + (solid ? 2:0)],
1.7 moko 162: uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
163: uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
164: uuid.node[0], uuid.node[1], uuid.node[2],
165: uuid.node[3], uuid.node[4], uuid.node[5]);
166: return cstr;
167: }
168:
169: char *get_uuid_boundary() {
170: uuid uuid=get_uuid();
171:
172: const int boundary_bufsize=10+32+1/*for zero-teminator*/+1/*for faulty snprintfs*/;
173: char* boundary=new(PointerFreeGC) char[boundary_bufsize];
174:
175: snprintf(boundary, boundary_bufsize,
176: "----------%08X%04X%04X%02X%02X%02X%02X%02X%02X%02X%02X",
177: uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
178: uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
179: uuid.node[0], uuid.node[1], uuid.node[2],
180: uuid.node[3], uuid.node[4], uuid.node[5]);
181: return boundary;
182: }
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