fix memory leak in err.c
[openssl.git] / crypto / err / err.c
1 /* crypto/err/err.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111
112 #include <stdio.h>
113 #include <stdarg.h>
114 #include <string.h>
115 #include <openssl/lhash.h>
116 #include <openssl/crypto.h>
117 #include "cryptlib.h"
118 #include <openssl/buffer.h>
119 #include <openssl/bio.h>
120 #include <openssl/err.h>
121
122
123 static LHASH *error_hash=NULL;
124 static LHASH *thread_hash=NULL;
125
126 /* static unsigned long err_hash(ERR_STRING_DATA *a); */
127 static unsigned long err_hash(const void *a_void);
128 /* static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b); */
129 static int err_cmp(const void *a_void, const void *b_void);
130 /* static unsigned long pid_hash(ERR_STATE *pid); */
131 static unsigned long pid_hash(const void *pid_void);
132 /* static int pid_cmp(ERR_STATE *a,ERR_STATE *pid); */
133 static int pid_cmp(const void *a_void,const void *pid_void);
134 static unsigned long get_error_values(int inc,const char **file,int *line,
135                                       const char **data,int *flags);
136
137 static void ERR_STATE_free(ERR_STATE *s);
138 #ifndef OPENSSL_NO_ERR
139 static ERR_STRING_DATA ERR_str_libraries[]=
140         {
141 {ERR_PACK(ERR_LIB_NONE,0,0)             ,"unknown library"},
142 {ERR_PACK(ERR_LIB_SYS,0,0)              ,"system library"},
143 {ERR_PACK(ERR_LIB_BN,0,0)               ,"bignum routines"},
144 {ERR_PACK(ERR_LIB_RSA,0,0)              ,"rsa routines"},
145 {ERR_PACK(ERR_LIB_DH,0,0)               ,"Diffie-Hellman routines"},
146 {ERR_PACK(ERR_LIB_EVP,0,0)              ,"digital envelope routines"},
147 {ERR_PACK(ERR_LIB_BUF,0,0)              ,"memory buffer routines"},
148 {ERR_PACK(ERR_LIB_OBJ,0,0)              ,"object identifier routines"},
149 {ERR_PACK(ERR_LIB_PEM,0,0)              ,"PEM routines"},
150 {ERR_PACK(ERR_LIB_DSA,0,0)              ,"dsa routines"},
151 {ERR_PACK(ERR_LIB_X509,0,0)             ,"x509 certificate routines"},
152 {ERR_PACK(ERR_LIB_ASN1,0,0)             ,"asn1 encoding routines"},
153 {ERR_PACK(ERR_LIB_CONF,0,0)             ,"configuration file routines"},
154 {ERR_PACK(ERR_LIB_CRYPTO,0,0)           ,"common libcrypto routines"},
155 {ERR_PACK(ERR_LIB_EC,0,0)               ,"elliptic curve routines"},
156 {ERR_PACK(ERR_LIB_SSL,0,0)              ,"SSL routines"},
157 {ERR_PACK(ERR_LIB_BIO,0,0)              ,"BIO routines"},
158 {ERR_PACK(ERR_LIB_PKCS7,0,0)            ,"PKCS7 routines"},
159 {ERR_PACK(ERR_LIB_X509V3,0,0)           ,"X509 V3 routines"},
160 {ERR_PACK(ERR_LIB_PKCS12,0,0)           ,"PKCS12 routines"},
161 {ERR_PACK(ERR_LIB_RAND,0,0)             ,"random number generator"},
162 {ERR_PACK(ERR_LIB_DSO,0,0)              ,"DSO support routines"},
163 {ERR_PACK(ERR_LIB_ENGINE,0,0)           ,"engine routines"},
164 {ERR_PACK(ERR_LIB_OCSP,0,0)             ,"OCSP routines"},
165 {0,NULL},
166         };
167
168 static ERR_STRING_DATA ERR_str_functs[]=
169         {
170         {ERR_PACK(0,SYS_F_FOPEN,0),             "fopen"},
171         {ERR_PACK(0,SYS_F_CONNECT,0),           "connect"},
172         {ERR_PACK(0,SYS_F_GETSERVBYNAME,0),     "getservbyname"},
173         {ERR_PACK(0,SYS_F_SOCKET,0),            "socket"}, 
174         {ERR_PACK(0,SYS_F_IOCTLSOCKET,0),       "ioctlsocket"},
175         {ERR_PACK(0,SYS_F_BIND,0),              "bind"},
176         {ERR_PACK(0,SYS_F_LISTEN,0),            "listen"},
177         {ERR_PACK(0,SYS_F_ACCEPT,0),            "accept"},
178 #ifdef OPENSSL_SYS_WINDOWS
179         {ERR_PACK(0,SYS_F_WSASTARTUP,0),        "WSAstartup"},
180 #endif
181         {ERR_PACK(0,SYS_F_OPENDIR,0),           "opendir"},
182         {0,NULL},
183         };
184
185 static ERR_STRING_DATA ERR_str_reasons[]=
186         {
187 {ERR_R_SYS_LIB                          ,"system lib"},
188 {ERR_R_BN_LIB                           ,"BN lib"},
189 {ERR_R_RSA_LIB                          ,"RSA lib"},
190 {ERR_R_DH_LIB                           ,"DH lib"},
191 {ERR_R_EVP_LIB                          ,"EVP lib"},
192 {ERR_R_BUF_LIB                          ,"BUF lib"},
193 {ERR_R_OBJ_LIB                          ,"OBJ lib"},
194 {ERR_R_PEM_LIB                          ,"PEM lib"},
195 {ERR_R_DSA_LIB                          ,"DSA lib"},
196 {ERR_R_X509_LIB                         ,"X509 lib"},
197 {ERR_R_ASN1_LIB                         ,"ASN1 lib"},
198 {ERR_R_CONF_LIB                         ,"CONF lib"},
199 {ERR_R_CRYPTO_LIB                       ,"CRYPTO lib"},
200 {ERR_R_EC_LIB                           ,"EC lib"},
201 {ERR_R_SSL_LIB                          ,"SSL lib"},
202 {ERR_R_BIO_LIB                          ,"BIO lib"},
203 {ERR_R_PKCS7_LIB                        ,"PKCS7 lib"},
204 {ERR_R_X509V3_LIB                       ,"X509V3 lib"},
205 {ERR_R_PKCS12_LIB                       ,"PKCS12 lib"},
206 {ERR_R_RAND_LIB                         ,"RAND lib"},
207 {ERR_R_DSO_LIB                          ,"DSO lib"},
208 {ERR_R_ENGINE_LIB                       ,"ENGINE lib"},
209 {ERR_R_OCSP_LIB                         ,"OCSP lib"},
210
211 {ERR_R_NESTED_ASN1_ERROR                ,"nested asn1 error"},
212 {ERR_R_BAD_ASN1_OBJECT_HEADER           ,"bad asn1 object header"},
213 {ERR_R_BAD_GET_ASN1_OBJECT_CALL         ,"bad get asn1 object call"},
214 {ERR_R_EXPECTING_AN_ASN1_SEQUENCE       ,"expecting an asn1 sequence"},
215 {ERR_R_ASN1_LENGTH_MISMATCH             ,"asn1 length mismatch"},
216 {ERR_R_MISSING_ASN1_EOS                 ,"missing asn1 eos"},
217
218 {ERR_R_FATAL                            ,"fatal"},
219 {ERR_R_MALLOC_FAILURE                   ,"malloc failure"},
220 {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED      ,"called a function you should not call"},
221 {ERR_R_PASSED_NULL_PARAMETER            ,"passed a null parameter"},
222 {ERR_R_INTERNAL_ERROR                   ,"internal error"},
223
224 {0,NULL},
225         };
226
227
228 #define NUM_SYS_STR_REASONS 127
229 #define LEN_SYS_STR_REASON 32
230
231 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
232 /* SYS_str_reasons is filled with copies of strerror() results at
233  * initialization.
234  * 'errno' values up to 127 should cover all usual errors,
235  * others will be displayed numerically by ERR_error_string.
236  * It is crucial that we have something for each reason code
237  * that occurs in ERR_str_reasons, or bogus reason strings
238  * will be returned for SYSerr(), which always gets an errno
239  * value and never one of those 'standard' reason codes. */
240
241 static void build_SYS_str_reasons()
242         {
243         /* OPENSSL_malloc cannot be used here, use static storage instead */
244         static char strerror_tab[NUM_SYS_STR_REASONS][LEN_SYS_STR_REASON];
245         int i;
246
247         CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
248
249         for (i = 1; i <= NUM_SYS_STR_REASONS; i++)
250                 {
251                 ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
252
253                 str->error = (unsigned long)i;
254                 if (str->string == NULL)
255                         {
256                         char (*dest)[LEN_SYS_STR_REASON] = &(strerror_tab[i - 1]);
257                         char *src = strerror(i);
258                         if (src != NULL)
259                                 {
260                                 strncpy(*dest, src, sizeof *dest);
261                                 (*dest)[sizeof *dest - 1] = '\0';
262                                 str->string = *dest;
263                                 }
264                         }
265                 if (str->string == NULL)
266                         str->string = "unknown";
267                 }
268
269         /* Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL},
270          * as required by ERR_load_strings. */
271
272         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
273         }
274 #endif
275
276 #define err_clear_data(p,i) \
277         if (((p)->err_data[i] != NULL) && \
278                 (p)->err_data_flags[i] & ERR_TXT_MALLOCED) \
279                 {  \
280                 OPENSSL_free((p)->err_data[i]); \
281                 (p)->err_data[i]=NULL; \
282                 } \
283         (p)->err_data_flags[i]=0;
284
285 static void ERR_STATE_free(ERR_STATE *s)
286         {
287         int i;
288
289         if(s == NULL)
290             return;
291
292         for (i=0; i<ERR_NUM_ERRORS; i++)
293                 {
294                 err_clear_data(s,i);
295                 }
296         OPENSSL_free(s);
297         }
298
299 void ERR_load_ERR_strings(void)
300         {
301         static int init=1;
302
303         if (init)
304                 {
305 #ifndef OPENSSL_NO_ERR
306                 ERR_load_strings(0,ERR_str_libraries);
307                 ERR_load_strings(0,ERR_str_reasons);
308                 ERR_load_strings(ERR_LIB_SYS,ERR_str_functs);
309                 build_SYS_str_reasons();
310                 ERR_load_strings(ERR_LIB_SYS,SYS_str_reasons);
311 #endif
312                 init=0;
313                 }
314         }
315
316 void ERR_load_strings(int lib, ERR_STRING_DATA *str)
317         {
318         if (error_hash == NULL)
319                 {
320                 CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
321                 error_hash=lh_new(err_hash, err_cmp);
322                 if (error_hash == NULL)
323                         {
324                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
325                         return;
326                         }
327                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
328
329                 ERR_load_ERR_strings();
330                 }
331
332         CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
333         while (str->error)
334                 {
335                 str->error|=ERR_PACK(lib,0,0);
336                 lh_insert(error_hash,str);
337                 str++;
338                 }
339         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
340         }
341
342 void ERR_free_strings(void)
343         {
344         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
345
346         if (error_hash != NULL)
347                 {
348                 lh_free(error_hash);
349                 error_hash=NULL;
350                 }
351
352         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
353         }
354
355 /********************************************************/
356
357 void ERR_put_error(int lib, int func, int reason, const char *file,
358              int line)
359         {
360         ERR_STATE *es;
361
362 #ifdef _OSD_POSIX
363         /* In the BS2000-OSD POSIX subsystem, the compiler generates
364          * path names in the form "*POSIX(/etc/passwd)".
365          * This dirty hack strips them to something sensible.
366          * @@@ We shouldn't modify a const string, though.
367          */
368         if (strncmp(file,"*POSIX(", sizeof("*POSIX(")-1) == 0) {
369                 char *end;
370
371                 /* Skip the "*POSIX(" prefix */
372                 file += sizeof("*POSIX(")-1;
373                 end = &file[strlen(file)-1];
374                 if (*end == ')')
375                         *end = '\0';
376                 /* Optional: use the basename of the path only. */
377                 if ((end = strrchr(file, '/')) != NULL)
378                         file = &end[1];
379         }
380 #endif
381         es=ERR_get_state();
382
383         es->top=(es->top+1)%ERR_NUM_ERRORS;
384         if (es->top == es->bottom)
385                 es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
386         es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
387         es->err_file[es->top]=file;
388         es->err_line[es->top]=line;
389         err_clear_data(es,es->top);
390         }
391
392 void ERR_clear_error(void)
393         {
394         ERR_STATE *es;
395
396         es=ERR_get_state();
397
398 #if 0
399         /* hmm... is this needed */
400         for (i=0; i<ERR_NUM_ERRORS; i++)
401                 {
402                 es->err_buffer[i]=0;
403                 es->err_file[i]=NULL;
404                 es->err_line[i]= -1;
405                 err_clear_data(es,i);
406                 }
407 #endif
408         es->top=es->bottom=0;
409         }
410
411
412 unsigned long ERR_get_error(void)
413         { return(get_error_values(1,NULL,NULL,NULL,NULL)); }
414
415 unsigned long ERR_get_error_line(const char **file,
416              int *line)
417         { return(get_error_values(1,file,line,NULL,NULL)); }
418
419 unsigned long ERR_get_error_line_data(const char **file, int *line,
420              const char **data, int *flags)
421         { return(get_error_values(1,file,line,
422              data,flags)); }
423
424 unsigned long ERR_peek_error(void)
425         { return(get_error_values(0,NULL,NULL,NULL,NULL)); }
426
427 unsigned long ERR_peek_error_line(const char **file,
428              int *line)
429         { return(get_error_values(0,file,line,NULL,NULL)); }
430
431 unsigned long ERR_peek_error_line_data(const char **file, int *line,
432              const char **data, int *flags)
433         { return(get_error_values(0,file,line,
434              data,flags)); }
435
436 static unsigned long get_error_values(int inc, const char **file, int *line,
437              const char **data, int *flags)
438         {       
439         int i=0;
440         ERR_STATE *es;
441         unsigned long ret;
442
443         es=ERR_get_state();
444
445         if (es->bottom == es->top) return(0);
446         i=(es->bottom+1)%ERR_NUM_ERRORS;
447
448         ret=es->err_buffer[i];
449         if (inc)
450                 {
451                 es->bottom=i;
452                 es->err_buffer[i]=0;
453                 }
454
455         if ((file != NULL) && (line != NULL))
456                 {
457                 if (es->err_file[i] == NULL)
458                         {
459                         *file="NA";
460                         if (line != NULL) *line=0;
461                         }
462                 else
463                         {
464                         *file=es->err_file[i];
465                         if (line != NULL) *line=es->err_line[i];
466                         }
467                 }
468
469         if (data == NULL)
470                 {
471                 if (inc && (es->err_data[i] != NULL) && (es->err_data_flags[i] & ERR_TXT_MALLOCED))
472                         {
473                         OPENSSL_free(es->err_data[i]);
474                         es->err_data[i] = NULL;
475                         }
476                 }
477         else
478                 {
479                 if (es->err_data[i] == NULL)
480                         {
481                         *data="";
482                         if (flags != NULL) *flags=0;
483                         }
484                 else
485                         {
486                         *data=es->err_data[i];
487                         if (flags != NULL) *flags=es->err_data_flags[i];
488                         }
489                 }
490         return(ret);
491         }
492
493 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
494         {
495         char lsbuf[64], fsbuf[64], rsbuf[64];
496         const char *ls,*fs,*rs;
497         unsigned long l,f,r;
498
499         l=ERR_GET_LIB(e);
500         f=ERR_GET_FUNC(e);
501         r=ERR_GET_REASON(e);
502
503         ls=ERR_lib_error_string(e);
504         fs=ERR_func_error_string(e);
505         rs=ERR_reason_error_string(e);
506
507         if (ls == NULL) 
508                 BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
509         if (fs == NULL)
510                 BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
511         if (rs == NULL)
512                 BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
513
514         BIO_snprintf(buf, len,"error:%08lX:%s:%s:%s", e, ls?ls:lsbuf, 
515                 fs?fs:fsbuf, rs?rs:rsbuf);
516         if (strlen(buf) == len-1)
517                 {
518                 /* output may be truncated; make sure we always have 5 
519                  * colon-separated fields, i.e. 4 colons ... */
520 #define NUM_COLONS 4
521                 if (len > NUM_COLONS) /* ... if possible */
522                         {
523                         int i;
524                         char *s = buf;
525                         
526                         for (i = 0; i < NUM_COLONS; i++)
527                                 {
528                                 char *colon = strchr(s, ':');
529                                 if (colon == NULL || colon > &buf[len-1] - NUM_COLONS + i)
530                                         {
531                                         /* set colon no. i at last possible position
532                                          * (buf[len-1] is the terminating 0)*/
533                                         colon = &buf[len-1] - NUM_COLONS + i;
534                                         *colon = ':';
535                                         }
536                                 s = colon + 1;
537                                 }
538                         }
539                 }
540         }
541
542 /* BAD for multi-threading: uses a local buffer if ret == NULL */
543 /* ERR_error_string_n should be used instead for ret != NULL
544  * as ERR_error_string cannot know how large the buffer is */
545 char *ERR_error_string(unsigned long e, char *ret)
546         {
547         static char buf[256];
548
549         if (ret == NULL) ret=buf;
550         ERR_error_string_n(e, ret, 256);
551
552         return(ret);
553         }
554
555 LHASH *ERR_get_string_table(void)
556         {
557         return(error_hash);
558         }
559
560 /* not thread-safe */
561 LHASH *ERR_get_err_state_table(void)
562         {
563         return(thread_hash);
564         }
565
566 const char *ERR_lib_error_string(unsigned long e)
567         {
568         ERR_STRING_DATA d,*p=NULL;
569         unsigned long l;
570
571         l=ERR_GET_LIB(e);
572
573         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
574
575         if (error_hash != NULL)
576                 {
577                 d.error=ERR_PACK(l,0,0);
578                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
579                 }
580
581         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
582
583         return((p == NULL)?NULL:p->string);
584         }
585
586 const char *ERR_func_error_string(unsigned long e)
587         {
588         ERR_STRING_DATA d,*p=NULL;
589         unsigned long l,f;
590
591         l=ERR_GET_LIB(e);
592         f=ERR_GET_FUNC(e);
593
594         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
595
596         if (error_hash != NULL)
597                 {
598                 d.error=ERR_PACK(l,f,0);
599                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
600                 }
601
602         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
603
604         return((p == NULL)?NULL:p->string);
605         }
606
607 const char *ERR_reason_error_string(unsigned long e)
608         {
609         ERR_STRING_DATA d,*p=NULL;
610         unsigned long l,r;
611
612         l=ERR_GET_LIB(e);
613         r=ERR_GET_REASON(e);
614
615         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
616
617         if (error_hash != NULL)
618                 {
619                 d.error=ERR_PACK(l,0,r);
620                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
621                 if (p == NULL)
622                         {
623                         d.error=ERR_PACK(0,0,r);
624                         p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
625                         }
626                 }
627
628         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
629
630         return((p == NULL)?NULL:p->string);
631         }
632
633 /* static unsigned long err_hash(ERR_STRING_DATA *a) */
634 static unsigned long err_hash(const void *a_void)
635         {
636         unsigned long ret,l;
637
638         l=((ERR_STRING_DATA *)a_void)->error;
639         ret=l^ERR_GET_LIB(l)^ERR_GET_FUNC(l);
640         return(ret^ret%19*13);
641         }
642
643 /* static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b) */
644 static int err_cmp(const void *a_void, const void *b_void)
645         {
646         return((int)(((ERR_STRING_DATA *)a_void)->error -
647                         ((ERR_STRING_DATA *)b_void)->error));
648         }
649
650 /* static unsigned long pid_hash(ERR_STATE *a) */
651 static unsigned long pid_hash(const void *a_void)
652         {
653         return(((ERR_STATE *)a_void)->pid*13);
654         }
655
656 /* static int pid_cmp(ERR_STATE *a, ERR_STATE *b) */
657 static int pid_cmp(const void *a_void, const void *b_void)
658         {
659         return((int)((long)((ERR_STATE *)a_void)->pid -
660                         (long)((ERR_STATE *)b_void)->pid));
661         }
662
663 void ERR_remove_state(unsigned long pid)
664         {
665         ERR_STATE *p = NULL,tmp;
666
667         if (thread_hash == NULL)
668                 return;
669         if (pid == 0)
670                 pid=(unsigned long)CRYPTO_thread_id();
671         tmp.pid=pid;
672         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
673         if (thread_hash)
674                 {
675                 p=(ERR_STATE *)lh_delete(thread_hash,&tmp);
676                 if (lh_num_items(thread_hash) == 0)
677                         {
678                         /* make sure we don't leak memory */
679                         lh_free(thread_hash);
680                         thread_hash = NULL;
681                         }
682                 }
683         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
684
685         if (p != NULL) ERR_STATE_free(p);
686         }
687
688 ERR_STATE *ERR_get_state(void)
689         {
690         static ERR_STATE fallback;
691         ERR_STATE *ret=NULL,tmp,*tmpp=NULL;
692         int thread_state_exists;
693         int i;
694         unsigned long pid;
695
696         pid=(unsigned long)CRYPTO_thread_id();
697
698         CRYPTO_r_lock(CRYPTO_LOCK_ERR);
699         if (thread_hash != NULL)
700                 {
701                 tmp.pid=pid;
702                 ret=(ERR_STATE *)lh_retrieve(thread_hash,&tmp);
703                 }
704         CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
705
706         /* ret == the error state, if NULL, make a new one */
707         if (ret == NULL)
708                 {
709                 ret=(ERR_STATE *)OPENSSL_malloc(sizeof(ERR_STATE));
710                 if (ret == NULL) return(&fallback);
711                 ret->pid=pid;
712                 ret->top=0;
713                 ret->bottom=0;
714                 for (i=0; i<ERR_NUM_ERRORS; i++)
715                         {
716                         ret->err_data[i]=NULL;
717                         ret->err_data_flags[i]=0;
718                         }
719
720                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
721
722                 /* no entry yet in thread_hash for current thread -
723                  * thus, it may have changed since we last looked at it */
724                 if (thread_hash == NULL)
725                         thread_hash = lh_new(pid_hash, pid_cmp);
726                 if (thread_hash == NULL)
727                         thread_state_exists = 0; /* allocation error */
728                 else
729                         {
730                         tmpp=(ERR_STATE *)lh_insert(thread_hash,ret);
731                         thread_state_exists = 1;
732                         }
733
734                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
735
736                 if (!thread_state_exists)
737                         {
738                         ERR_STATE_free(ret); /* could not insert it */
739                         return(&fallback);
740                         }
741                 
742                 if (tmpp != NULL) /* old entry - should not happen */
743                         {
744                         ERR_STATE_free(tmpp);
745                         }
746                 }
747         return(ret);
748         }
749
750 int ERR_get_next_error_library(void)
751         {
752         static int value=ERR_LIB_USER;
753
754         return(value++);
755         }
756
757 void ERR_set_error_data(char *data, int flags)
758         {
759         ERR_STATE *es;
760         int i;
761
762         es=ERR_get_state();
763
764         i=es->top;
765         if (i == 0)
766                 i=ERR_NUM_ERRORS-1;
767
768         es->err_data[i]=data;
769         es->err_data_flags[es->top]=flags;
770         }
771
772 void ERR_add_error_data(int num, ...)
773         {
774         va_list args;
775         int i,n,s;
776         char *str,*p,*a;
777
778         s=64;
779         str=OPENSSL_malloc(s+1);
780         if (str == NULL) return;
781         str[0]='\0';
782
783         va_start(args, num);
784         n=0;
785         for (i=0; i<num; i++)
786                 {
787                 a=va_arg(args, char*);
788                 /* ignore NULLs, thanks to Bob Beck <beck@obtuse.com> */
789                 if (a != NULL)
790                         {
791                         n+=strlen(a);
792                         if (n > s)
793                                 {
794                                 s=n+20;
795                                 p=OPENSSL_realloc(str,s+1);
796                                 if (p == NULL)
797                                         {
798                                         OPENSSL_free(str);
799                                         return;
800                                         }
801                                 else
802                                         str=p;
803                                 }
804                         strcat(str,a);
805                         }
806                 }
807         ERR_set_error_data(str,ERR_TXT_MALLOCED|ERR_TXT_STRING);
808
809         va_end(args);
810         }
811