1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <openssl/objects.h>
5 #include <openssl/comp.h>
6 #include <openssl/err.h>
7
8 COMP_METHOD *COMP_zlib(void );
9
10 static COMP_METHOD zlib_method_nozlib={
11 NID_undef,
12 "(undef)",
13 NULL,
14 NULL,
15 NULL,
16 NULL,
17 NULL,
18 NULL,
19 };
20
21 #ifndef ZLIB
22 #undef ZLIB_SHARED
23 #else
24
25 #include <zlib.h>
26
27 static int zlib_stateful_init(COMP_CTX *ctx);
28 static void zlib_stateful_finish(COMP_CTX *ctx);
29 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
30 unsigned int olen, unsigned char *in, unsigned int ilen);
31 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
32 unsigned int olen, unsigned char *in, unsigned int ilen);
33
34 #if 0
35 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
36 unsigned int olen, unsigned char *in, unsigned int ilen);
37 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
38 unsigned int olen, unsigned char *in, unsigned int ilen);
39
40 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
41 uLong sourceLen);
42
43 static COMP_METHOD zlib_stateless_method={
44 NID_zlib_compression,
45 LN_zlib_compression,
46 NULL,
47 NULL,
48 zlib_compress_block,
49 zlib_expand_block,
50 NULL,
51 NULL,
52 };
53 #endif
54
55 static COMP_METHOD zlib_stateful_method={
56 NID_zlib_compression,
57 LN_zlib_compression,
58 zlib_stateful_init,
59 zlib_stateful_finish,
60 zlib_stateful_compress_block,
61 zlib_stateful_expand_block,
62 NULL,
63 NULL,
64 };
65
66 /*
67 * When OpenSSL is built on Windows, we do not want to require that
68 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
69 * work. Therefore, all ZLIB routines are loaded at run time
70 * and we do not link to a .LIB file.
71 */
72 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
73 # include <windows.h>
74
75 # define Z_CALLCONV _stdcall
76 # ifndef ZLIB_SHARED
77 # define ZLIB_SHARED
78 # endif
79 #else
80 # define Z_CALLCONV
81 #endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
82
83 #ifdef ZLIB_SHARED
84 #include <openssl/dso.h>
85
86 /* Prototypes for built in stubs */
87 #if 0
88 static int stub_compress(Bytef *dest,uLongf *destLen,
89 const Bytef *source, uLong sourceLen);
90 #endif
91 static int stub_inflateEnd(z_streamp strm);
92 static int stub_inflate(z_streamp strm, int flush);
93 static int stub_inflateInit_(z_streamp strm, const char * version,
94 int stream_size);
95 static int stub_deflateEnd(z_streamp strm);
96 static int stub_deflate(z_streamp strm, int flush);
97 static int stub_deflateInit_(z_streamp strm, int level,
98 const char * version, int stream_size);
99
100 /* Function pointers */
101 typedef int (Z_CALLCONV *compress_ft)(Bytef *dest,uLongf *destLen,
102 const Bytef *source, uLong sourceLen);
103 typedef int (Z_CALLCONV *inflateEnd_ft)(z_streamp strm);
104 typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
105 typedef int (Z_CALLCONV *inflateInit__ft)(z_streamp strm,
106 const char * version, int stream_size);
107 typedef int (Z_CALLCONV *deflateEnd_ft)(z_streamp strm);
108 typedef int (Z_CALLCONV *deflate_ft)(z_streamp strm, int flush);
109 typedef int (Z_CALLCONV *deflateInit__ft)(z_streamp strm, int level,
110 const char * version, int stream_size);
111 static compress_ft p_compress=NULL;
112 static inflateEnd_ft p_inflateEnd=NULL;
113 static inflate_ft p_inflate=NULL;
114 static inflateInit__ft p_inflateInit_=NULL;
115 static deflateEnd_ft p_deflateEnd=NULL;
116 static deflate_ft p_deflate=NULL;
117 static deflateInit__ft p_deflateInit_=NULL;
118
119 static int zlib_loaded = 0; /* only attempt to init func pts once */
120 static DSO *zlib_dso = NULL;
121
122 #define compress stub_compress
123 #define inflateEnd stub_inflateEnd
124 #define inflate stub_inflate
125 #define inflateInit_ stub_inflateInit_
126 #define deflateEnd stub_deflateEnd
127 #define deflate stub_deflate
128 #define deflateInit_ stub_deflateInit_
129 #endif /* ZLIB_SHARED */
130
131 struct zlib_state
132 {
133 z_stream istream;
134 z_stream ostream;
135 };
136
137 static int zlib_stateful_ex_idx = -1;
138
zlib_stateful_free_ex_data(void * obj,void * item,CRYPTO_EX_DATA * ad,int ind,long argl,void * argp)139 static void zlib_stateful_free_ex_data(void *obj, void *item,
140 CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
141 {
142 struct zlib_state *state = (struct zlib_state *)item;
143 inflateEnd(&state->istream);
144 deflateEnd(&state->ostream);
145 OPENSSL_free(state);
146 }
147
zlib_stateful_init(COMP_CTX * ctx)148 static int zlib_stateful_init(COMP_CTX *ctx)
149 {
150 int err;
151 struct zlib_state *state =
152 (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
153
154 if (state == NULL)
155 goto err;
156
157 state->istream.zalloc = Z_NULL;
158 state->istream.zfree = Z_NULL;
159 state->istream.opaque = Z_NULL;
160 state->istream.next_in = Z_NULL;
161 state->istream.next_out = Z_NULL;
162 state->istream.avail_in = 0;
163 state->istream.avail_out = 0;
164 err = inflateInit_(&state->istream,
165 ZLIB_VERSION, sizeof(z_stream));
166 if (err != Z_OK)
167 goto err;
168
169 state->ostream.zalloc = Z_NULL;
170 state->ostream.zfree = Z_NULL;
171 state->ostream.opaque = Z_NULL;
172 state->ostream.next_in = Z_NULL;
173 state->ostream.next_out = Z_NULL;
174 state->ostream.avail_in = 0;
175 state->ostream.avail_out = 0;
176 err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
177 ZLIB_VERSION, sizeof(z_stream));
178 if (err != Z_OK)
179 goto err;
180
181 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
182 if (zlib_stateful_ex_idx == -1)
183 {
184 CRYPTO_w_lock(CRYPTO_LOCK_COMP);
185 if (zlib_stateful_ex_idx == -1)
186 zlib_stateful_ex_idx =
187 CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
188 0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
189 CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
190 if (zlib_stateful_ex_idx == -1)
191 goto err;
192 }
193 CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
194 return 1;
195 err:
196 if (state) OPENSSL_free(state);
197 return 0;
198 }
199
zlib_stateful_finish(COMP_CTX * ctx)200 static void zlib_stateful_finish(COMP_CTX *ctx)
201 {
202 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
203 }
204
zlib_stateful_compress_block(COMP_CTX * ctx,unsigned char * out,unsigned int olen,unsigned char * in,unsigned int ilen)205 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
206 unsigned int olen, unsigned char *in, unsigned int ilen)
207 {
208 int err = Z_OK;
209 struct zlib_state *state =
210 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
211 zlib_stateful_ex_idx);
212
213 if (state == NULL)
214 return -1;
215
216 state->ostream.next_in = in;
217 state->ostream.avail_in = ilen;
218 state->ostream.next_out = out;
219 state->ostream.avail_out = olen;
220 if (ilen > 0)
221 err = deflate(&state->ostream, Z_SYNC_FLUSH);
222 if (err != Z_OK)
223 return -1;
224 #ifdef DEBUG_ZLIB
225 fprintf(stderr,"compress(%4d)->%4d %s\n",
226 ilen,olen - state->ostream.avail_out,
227 (ilen != olen - state->ostream.avail_out)?"zlib":"clear");
228 #endif
229 return olen - state->ostream.avail_out;
230 }
231
zlib_stateful_expand_block(COMP_CTX * ctx,unsigned char * out,unsigned int olen,unsigned char * in,unsigned int ilen)232 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
233 unsigned int olen, unsigned char *in, unsigned int ilen)
234 {
235 int err = Z_OK;
236
237 struct zlib_state *state =
238 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
239 zlib_stateful_ex_idx);
240
241 if (state == NULL)
242 return 0;
243
244 state->istream.next_in = in;
245 state->istream.avail_in = ilen;
246 state->istream.next_out = out;
247 state->istream.avail_out = olen;
248 if (ilen > 0)
249 err = inflate(&state->istream, Z_SYNC_FLUSH);
250 if (err != Z_OK)
251 return -1;
252 #ifdef DEBUG_ZLIB
253 fprintf(stderr,"expand(%4d)->%4d %s\n",
254 ilen,olen - state->istream.avail_out,
255 (ilen != olen - state->istream.avail_out)?"zlib":"clear");
256 #endif
257 return olen - state->istream.avail_out;
258 }
259
260 #if 0
261 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
262 unsigned int olen, unsigned char *in, unsigned int ilen)
263 {
264 unsigned long l;
265 int i;
266 int clear=1;
267
268 if (ilen > 128)
269 {
270 out[0]=1;
271 l=olen-1;
272 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
273 if (i != Z_OK)
274 return(-1);
275 if (ilen > l)
276 {
277 clear=0;
278 l++;
279 }
280 }
281 if (clear)
282 {
283 out[0]=0;
284 memcpy(&(out[1]),in,ilen);
285 l=ilen+1;
286 }
287 #ifdef DEBUG_ZLIB
288 fprintf(stderr,"compress(%4d)->%4d %s\n",
289 ilen,(int)l,(clear)?"clear":"zlib");
290 #endif
291 return((int)l);
292 }
293
294 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
295 unsigned int olen, unsigned char *in, unsigned int ilen)
296 {
297 unsigned long l;
298 int i;
299
300 if (in[0])
301 {
302 l=olen;
303 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
304 if (i != Z_OK)
305 return(-1);
306 }
307 else
308 {
309 memcpy(out,&(in[1]),ilen-1);
310 l=ilen-1;
311 }
312 #ifdef DEBUG_ZLIB
313 fprintf(stderr,"expand (%4d)->%4d %s\n",
314 ilen,(int)l,in[0]?"zlib":"clear");
315 #endif
316 return((int)l);
317 }
318
319 static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
320 uLong sourceLen)
321 {
322 z_stream stream;
323 int err;
324
325 stream.next_in = (Bytef*)source;
326 stream.avail_in = (uInt)sourceLen;
327 /* Check for source > 64K on 16-bit machine: */
328 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
329
330 stream.next_out = dest;
331 stream.avail_out = (uInt)*destLen;
332 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
333
334 stream.zalloc = (alloc_func)0;
335 stream.zfree = (free_func)0;
336
337 err = inflateInit_(&stream,
338 ZLIB_VERSION, sizeof(z_stream));
339 if (err != Z_OK) return err;
340
341 err = inflate(&stream, Z_FINISH);
342 if (err != Z_STREAM_END) {
343 inflateEnd(&stream);
344 return err;
345 }
346 *destLen = stream.total_out;
347
348 err = inflateEnd(&stream);
349 return err;
350 }
351 #endif
352
353 #endif
354
COMP_zlib(void)355 COMP_METHOD *COMP_zlib(void)
356 {
357 COMP_METHOD *meth = &zlib_method_nozlib;
358
359 #ifdef ZLIB_SHARED
360 if (!zlib_loaded)
361 {
362 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
363 zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
364 if (!zlib_dso)
365 {
366 zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
367 if (zlib_dso)
368 {
369 /* Clear the errors from the first failed
370 DSO_load() */
371 ERR_clear_error();
372 }
373 }
374 #else
375 zlib_dso = DSO_load(NULL, "z", NULL, 0);
376 #endif
377 if (zlib_dso != NULL)
378 {
379 p_compress
380 = (compress_ft) DSO_bind_func(zlib_dso,
381 "compress");
382 p_inflateEnd
383 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
384 "inflateEnd");
385 p_inflate
386 = (inflate_ft) DSO_bind_func(zlib_dso,
387 "inflate");
388 p_inflateInit_
389 = (inflateInit__ft) DSO_bind_func(zlib_dso,
390 "inflateInit_");
391 p_deflateEnd
392 = (deflateEnd_ft) DSO_bind_func(zlib_dso,
393 "deflateEnd");
394 p_deflate
395 = (deflate_ft) DSO_bind_func(zlib_dso,
396 "deflate");
397 p_deflateInit_
398 = (deflateInit__ft) DSO_bind_func(zlib_dso,
399 "deflateInit_");
400 zlib_loaded++;
401 }
402 }
403
404 #endif
405 #if defined(ZLIB) || defined(ZLIB_SHARED)
406 meth = &zlib_stateful_method;
407 #endif
408
409 return(meth);
410 }
411
412 #ifdef ZLIB_SHARED
413 #if 0
414 /* Stubs for each function to be dynamicly loaded */
415 static int
416 stub_compress(Bytef *dest,uLongf *destLen,const Bytef *source, uLong sourceLen)
417 {
418 if (p_compress)
419 return(p_compress(dest,destLen,source,sourceLen));
420 else
421 return(Z_MEM_ERROR);
422 }
423 #endif
424
425 static int
stub_inflateEnd(z_streamp strm)426 stub_inflateEnd(z_streamp strm)
427 {
428 if ( p_inflateEnd )
429 return(p_inflateEnd(strm));
430 else
431 return(Z_MEM_ERROR);
432 }
433
434 static int
stub_inflate(z_streamp strm,int flush)435 stub_inflate(z_streamp strm, int flush)
436 {
437 if ( p_inflate )
438 return(p_inflate(strm,flush));
439 else
440 return(Z_MEM_ERROR);
441 }
442
443 static int
stub_inflateInit_(z_streamp strm,const char * version,int stream_size)444 stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
445 {
446 if ( p_inflateInit_ )
447 return(p_inflateInit_(strm,version,stream_size));
448 else
449 return(Z_MEM_ERROR);
450 }
451
452 static int
stub_deflateEnd(z_streamp strm)453 stub_deflateEnd(z_streamp strm)
454 {
455 if ( p_deflateEnd )
456 return(p_deflateEnd(strm));
457 else
458 return(Z_MEM_ERROR);
459 }
460
461 static int
stub_deflate(z_streamp strm,int flush)462 stub_deflate(z_streamp strm, int flush)
463 {
464 if ( p_deflate )
465 return(p_deflate(strm,flush));
466 else
467 return(Z_MEM_ERROR);
468 }
469
470 static int
stub_deflateInit_(z_streamp strm,int level,const char * version,int stream_size)471 stub_deflateInit_(z_streamp strm, int level,
472 const char * version, int stream_size)
473 {
474 if ( p_deflateInit_ )
475 return(p_deflateInit_(strm,level,version,stream_size));
476 else
477 return(Z_MEM_ERROR);
478 }
479
480 #endif /* ZLIB_SHARED */
481