1/*
2 * Copyright 2003-2017 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "e_os.h"
11#include <limits.h>
12#include <openssl/crypto.h>
13#include "internal/cryptlib.h"
14
15char *CRYPTO_strdup(const char *str, const char* file, int line)
16{
17 char *ret;
18
19 if (str == NULL)
20 return NULL;
21 ret = CRYPTO_malloc(strlen(str) + 1, file, line);
22 if (ret != NULL)
23 strcpy(ret, str);
24 return ret;
25}
26
27char *CRYPTO_strndup(const char *str, size_t s, const char* file, int line)
28{
29 size_t maxlen;
30 char *ret;
31
32 if (str == NULL)
33 return NULL;
34
35 maxlen = OPENSSL_strnlen(str, s);
36
37 ret = CRYPTO_malloc(maxlen + 1, file, line);
38 if (ret) {
39 memcpy(ret, str, maxlen);
40 ret[maxlen] = '\0';
41 }
42 return ret;
43}
44
45void *CRYPTO_memdup(const void *data, size_t siz, const char* file, int line)
46{
47 void *ret;
48
49 if (data == NULL || siz >= INT_MAX)
50 return NULL;
51
52 ret = CRYPTO_malloc(siz, file, line);
53 if (ret == NULL) {
54 CRYPTOerr(CRYPTO_F_CRYPTO_MEMDUP, ERR_R_MALLOC_FAILURE);
55 return NULL;
56 }
57 return memcpy(ret, data, siz);
58}
59
60size_t OPENSSL_strnlen(const char *str, size_t maxlen)
61{
62 const char *p;
63
64 for (p = str; maxlen-- != 0 && *p != '\0'; ++p) ;
65
66 return p - str;
67}
68
69size_t OPENSSL_strlcpy(char *dst, const char *src, size_t size)
70{
71 size_t l = 0;
72 for (; size > 1 && *src; size--) {
73 *dst++ = *src++;
74 l++;
75 }
76 if (size)
77 *dst = '\0';
78 return l + strlen(src);
79}
80
81size_t OPENSSL_strlcat(char *dst, const char *src, size_t size)
82{
83 size_t l = 0;
84 for (; size > 0 && *dst; size--, dst++)
85 l++;
86 return l + OPENSSL_strlcpy(dst, src, size);
87}
88
89int OPENSSL_hexchar2int(unsigned char c)
90{
91#ifdef CHARSET_EBCDIC
92 c = os_toebcdic[c];
93#endif
94
95 switch (c) {
96 case '0':
97 return 0;
98 case '1':
99 return 1;
100 case '2':
101 return 2;
102 case '3':
103 return 3;
104 case '4':
105 return 4;
106 case '5':
107 return 5;
108 case '6':
109 return 6;
110 case '7':
111 return 7;
112 case '8':
113 return 8;
114 case '9':
115 return 9;
116 case 'a': case 'A':
117 return 0x0A;
118 case 'b': case 'B':
119 return 0x0B;
120 case 'c': case 'C':
121 return 0x0C;
122 case 'd': case 'D':
123 return 0x0D;
124 case 'e': case 'E':
125 return 0x0E;
126 case 'f': case 'F':
127 return 0x0F;
128 }
129 return -1;
130}
131
132/*
133 * Give a string of hex digits convert to a buffer
134 */
135int OPENSSL_hexstr2buf_ex(unsigned char *buf, size_t buf_n, size_t *buflen,
136 const char *str)
137{
138 unsigned char *q;
139 unsigned char ch, cl;
140 int chi, cli;
141 const unsigned char *p;
142 size_t cnt;
143
144 for (p = (const unsigned char *)str, q = buf, cnt = 0; *p; ) {
145 ch = *p++;
146 if (ch == ':')
147 continue;
148 cl = *p++;
149 if (!cl) {
150 CRYPTOerr(CRYPTO_F_OPENSSL_HEXSTR2BUF_EX,
151 CRYPTO_R_ODD_NUMBER_OF_DIGITS);
152 return 0;
153 }
154 cli = OPENSSL_hexchar2int(cl);
155 chi = OPENSSL_hexchar2int(ch);
156 if (cli < 0 || chi < 0) {
157 CRYPTOerr(CRYPTO_F_OPENSSL_HEXSTR2BUF_EX,
158 CRYPTO_R_ILLEGAL_HEX_DIGIT);
159 return 0;
160 }
161 cnt++;
162 if (q != NULL) {
163 if (cnt > buf_n) {
164 CRYPTOerr(CRYPTO_F_OPENSSL_HEXSTR2BUF_EX,
165 CRYPTO_R_TOO_SMALL_BUFFER);
166 return 0;
167 }
168 *q++ = (unsigned char)((chi << 4) | cli);
169 }
170 }
171
172 if (buflen != NULL)
173 *buflen = cnt;
174 return 1;
175}
176
177unsigned char *OPENSSL_hexstr2buf(const char *str, long *buflen)
178{
179 unsigned char *buf;
180 size_t buf_n, tmp_buflen;
181
182 buf_n = strlen(str) >> 1;
183 if ((buf = OPENSSL_malloc(buf_n)) == NULL) {
184 CRYPTOerr(CRYPTO_F_OPENSSL_HEXSTR2BUF, ERR_R_MALLOC_FAILURE);
185 return NULL;
186 }
187
188 if (buflen != NULL)
189 *buflen = 0;
190 tmp_buflen = 0;
191 if (OPENSSL_hexstr2buf_ex(buf, buf_n, &tmp_buflen, str)) {
192 if (buflen != NULL)
193 *buflen = (long)tmp_buflen;
194 return buf;
195 }
196 OPENSSL_free(buf);
197 return NULL;
198}
199
200int OPENSSL_buf2hexstr_ex(char *str, size_t str_n, size_t *strlen,
201 const unsigned char *buf, size_t buflen)
202{
203 static const char hexdig[] = "0123456789ABCDEF";
204 const unsigned char *p;
205 char *q;
206 size_t i;
207
208 if (strlen != NULL)
209 *strlen = buflen * 3;
210 if (str == NULL)
211 return 1;
212
213 if (str_n < (unsigned long)buflen * 3) {
214 CRYPTOerr(CRYPTO_F_OPENSSL_BUF2HEXSTR_EX, CRYPTO_R_TOO_SMALL_BUFFER);
215 return 0;
216 }
217
218 q = str;
219 for (i = 0, p = buf; i < buflen; i++, p++) {
220 *q++ = hexdig[(*p >> 4) & 0xf];
221 *q++ = hexdig[*p & 0xf];
222 *q++ = ':';
223 }
224 q[-1] = 0;
225#ifdef CHARSET_EBCDIC
226 ebcdic2ascii(str, str, q - str - 1);
227#endif
228 return 1;
229}
230
231/*
232 * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
233 * hex representation @@@ (Contents of buffer are always kept in ASCII, also
234 * on EBCDIC machines)
235 */
236char *OPENSSL_buf2hexstr(const unsigned char *buf, long buflen)
237{
238 char *tmp;
239 size_t tmp_n;
240
241 if (buflen == 0)
242 return OPENSSL_zalloc(1);
243
244 tmp_n = buflen * 3;
245 if ((tmp = OPENSSL_malloc(tmp_n)) == NULL) {
246 CRYPTOerr(CRYPTO_F_OPENSSL_BUF2HEXSTR, ERR_R_MALLOC_FAILURE);
247 return NULL;
248 }
249
250 if (OPENSSL_buf2hexstr_ex(tmp, tmp_n, NULL, buf, buflen))
251 return tmp;
252 OPENSSL_free(tmp);
253 return NULL;
254}
255
256int openssl_strerror_r(int errnum, char *buf, size_t buflen)
257{
258#if defined(_MSC_VER) && _MSC_VER>=1400
259 return !strerror_s(buf, buflen, errnum);
260#elif defined(_GNU_SOURCE)
261 char *err;
262
263 /*
264 * GNU strerror_r may not actually set buf.
265 * It can return a pointer to some (immutable) static string in which case
266 * buf is left unused.
267 */
268 err = strerror_r(errnum, buf, buflen);
269 if (err == NULL || buflen == 0)
270 return 0;
271 /*
272 * If err is statically allocated, err != buf and we need to copy the data.
273 * If err points somewhere inside buf, OPENSSL_strlcpy can handle this,
274 * since src and dest are not annotated with __restrict and the function
275 * reads src byte for byte and writes to dest.
276 * If err == buf we do not have to copy anything.
277 */
278 if (err != buf)
279 OPENSSL_strlcpy(buf, err, buflen);
280 return 1;
281#elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
282 (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
283 /*
284 * We can use "real" strerror_r. The OpenSSL version differs in that it
285 * gives 1 on success and 0 on failure for consistency with other OpenSSL
286 * functions. Real strerror_r does it the other way around
287 */
288 return !strerror_r(errnum, buf, buflen);
289#else
290 char *err;
291
292 /* Fall back to non-thread safe strerror()...its all we can do */
293 if (buflen < 2)
294 return 0;
295 err = strerror(errnum);
296 /* Can this ever happen? */
297 if (err == NULL)
298 return 0;
299 OPENSSL_strlcpy(buf, err, buflen);
300 return 1;
301#endif
302}
303