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1 /*
2  * Copyright (c) 2008-2012 Niels Provos and Nick Mathewson
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  * 3. The name of the author may not be used to endorse or promote products
13  *    derived from this software without specific prior written permission.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26
27 /* The old tests here need assertions to work. */
28 #undef NDEBUG
29
30 #ifdef _WIN32
31 #include <winsock2.h>
32 #include <windows.h>
33 #endif
34
35 #include "event2/event-config.h"
36
37 #include <sys/types.h>
38 #ifndef _WIN32
39 #include <sys/socket.h>
40 #include <sys/wait.h>
41 #include <unistd.h>
42 #include <netdb.h>
43 #endif
44 #include <signal.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48
49 #include <assert.h>
50 #include <errno.h>
51
52 #include "event2/util.h"
53 #include "event2/event.h"
54 #include "event2/event_compat.h"
55 #include "event2/buffer.h"
56 #include "event2/bufferevent.h"
57
58 #include "regress.h"
59 #include "mm-internal.h"
60
61 /* zlib 1.2.4 and 1.2.5 do some "clever" things with macros.  Instead of
62    saying "(defined(FOO) ? FOO : 0)" they like to say "FOO-0", on the theory
63    that nobody will care if the compile outputs a no-such-identifier warning.
64
65    Sorry, but we like -Werror over here, so I guess we need to define these.
66    I hope that zlib 1.2.6 doesn't break these too.
67 */
68 #ifndef _LARGEFILE64_SOURCE
69 #define _LARGEFILE64_SOURCE 0
70 #endif
71 #ifndef _LFS64_LARGEFILE
72 #define _LFS64_LARGEFILE 0
73 #endif
74 #ifndef _FILE_OFFSET_BITS
75 #define _FILE_OFFSET_BITS 0
76 #endif
77 #ifndef off64_t
78 #define off64_t ev_int64_t
79 #endif
80
81 #include <zlib.h>
82
83 static int infilter_calls;
84 static int outfilter_calls;
85 static int readcb_finished;
86 static int writecb_finished;
87 static int errorcb_invoked;
88
89 /*
90  * Zlib filters
91  */
92
93 static void
94 zlib_deflate_free(void *ctx)
95 {
96         z_streamp p = ctx;
97
98         assert(deflateEnd(p) == Z_OK);
99         mm_free(p);
100 }
101
102 static void
103 zlib_inflate_free(void *ctx)
104 {
105         z_streamp p = ctx;
106
107         assert(inflateEnd(p) == Z_OK);
108         mm_free(p);
109 }
110
111 static int
112 getstate(enum bufferevent_flush_mode state)
113 {
114         switch (state) {
115         case BEV_FINISHED:
116                 return Z_FINISH;
117         case BEV_FLUSH:
118                 return Z_SYNC_FLUSH;
119         case BEV_NORMAL:
120         default:
121                 return Z_NO_FLUSH;
122         }
123 }
124
125 /*
126  * The input filter is triggered only on new input read from the network.
127  * That means all input data needs to be consumed or the filter needs to
128  * initiate its own triggering via a timeout.
129  */
130 static enum bufferevent_filter_result
131 zlib_input_filter(struct evbuffer *src, struct evbuffer *dst,
132     ev_ssize_t lim, enum bufferevent_flush_mode state, void *ctx)
133 {
134         struct evbuffer_iovec v_in[1];
135         struct evbuffer_iovec v_out[1];
136         int nread, nwrite;
137         int res, n;
138
139         z_streamp p = ctx;
140
141         do {
142                 /* let's do some decompression */
143                 n = evbuffer_peek(src, -1, NULL, v_in, 1);
144                 if (n) {
145                         p->avail_in = v_in[0].iov_len;
146                         p->next_in = v_in[0].iov_base;
147                 } else {
148                         p->avail_in = 0;
149                         p->next_in = 0;
150                 }
151
152                 evbuffer_reserve_space(dst, 4096, v_out, 1);
153                 p->next_out = v_out[0].iov_base;
154                 p->avail_out = v_out[0].iov_len;
155
156                 /* we need to flush zlib if we got a flush */
157                 res = inflate(p, getstate(state));
158
159                 /* let's figure out how much was compressed */
160                 nread = v_in[0].iov_len - p->avail_in;
161                 nwrite = v_out[0].iov_len - p->avail_out;
162
163                 evbuffer_drain(src, nread);
164                 v_out[0].iov_len = nwrite;
165                 evbuffer_commit_space(dst, v_out, 1);
166
167                 if (res==Z_BUF_ERROR) {
168                         /* We're out of space, or out of decodeable input.
169                            Only if nwrite == 0 assume the latter.
170                          */
171                         if (nwrite == 0)
172                                 return BEV_NEED_MORE;
173                 } else {
174                         assert(res == Z_OK || res == Z_STREAM_END);
175                 }
176
177         } while (evbuffer_get_length(src) > 0);
178
179         ++infilter_calls;
180
181         return (BEV_OK);
182 }
183
184 static enum bufferevent_filter_result
185 zlib_output_filter(struct evbuffer *src, struct evbuffer *dst,
186     ev_ssize_t lim, enum bufferevent_flush_mode state, void *ctx)
187 {
188         struct evbuffer_iovec v_in[1];
189         struct evbuffer_iovec v_out[1];
190         int nread, nwrite;
191         int res, n;
192
193         z_streamp p = ctx;
194
195         do {
196                 /* let's do some compression */
197                 n = evbuffer_peek(src, -1, NULL, v_in, 1);
198                 if (n) {
199                         p->avail_in = v_in[0].iov_len;
200                         p->next_in = v_in[0].iov_base;
201                 } else {
202                         p->avail_in = 0;
203                         p->next_in = 0;
204                 }
205
206                 evbuffer_reserve_space(dst, 4096, v_out, 1);
207                 p->next_out = v_out[0].iov_base;
208                 p->avail_out = v_out[0].iov_len;
209
210                 /* we need to flush zlib if we got a flush */
211                 res = deflate(p, getstate(state));
212
213                 /* let's figure out how much was decompressed */
214                 nread = v_in[0].iov_len - p->avail_in;
215                 nwrite = v_out[0].iov_len - p->avail_out;
216
217                 evbuffer_drain(src, nread);
218                 v_out[0].iov_len = nwrite;
219                 evbuffer_commit_space(dst, v_out, 1);
220
221                 if (res==Z_BUF_ERROR) {
222                         /* We're out of space, or out of decodeable input.
223                            Only if nwrite == 0 assume the latter.
224                          */
225                         if (nwrite == 0)
226                                 return BEV_NEED_MORE;
227                 } else {
228                         assert(res == Z_OK || res == Z_STREAM_END);
229                 }
230
231         } while (evbuffer_get_length(src) > 0);
232
233         ++outfilter_calls;
234
235         return (BEV_OK);
236 }
237
238 /*
239  * simple bufferevent test (over transparent zlib treatment)
240  */
241
242 static void
243 readcb(struct bufferevent *bev, void *arg)
244 {
245         if (evbuffer_get_length(bufferevent_get_input(bev)) == 8333) {
246                 struct evbuffer *evbuf = evbuffer_new();
247                 assert(evbuf != NULL);
248
249                 /* gratuitous test of bufferevent_read_buffer */
250                 bufferevent_read_buffer(bev, evbuf);
251
252                 bufferevent_disable(bev, EV_READ);
253
254                 if (evbuffer_get_length(evbuf) == 8333) {
255                         ++readcb_finished;
256                 }
257
258                 evbuffer_free(evbuf);
259         }
260 }
261
262 static void
263 writecb(struct bufferevent *bev, void *arg)
264 {
265         if (evbuffer_get_length(bufferevent_get_output(bev)) == 0) {
266                 ++writecb_finished;
267         }
268 }
269
270 static void
271 errorcb(struct bufferevent *bev, short what, void *arg)
272 {
273         errorcb_invoked = 1;
274 }
275
276 void
277 test_bufferevent_zlib(void *arg)
278 {
279         struct bufferevent *bev1=NULL, *bev2=NULL;
280         char buffer[8333];
281         z_stream *z_input, *z_output;
282         int i, r;
283         evutil_socket_t pair[2] = {-1, -1};
284         (void)arg;
285
286         infilter_calls = outfilter_calls = readcb_finished = writecb_finished
287             = errorcb_invoked = 0;
288
289         if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) {
290                 tt_abort_perror("socketpair");
291         }
292
293         evutil_make_socket_nonblocking(pair[0]);
294         evutil_make_socket_nonblocking(pair[1]);
295
296         bev1 = bufferevent_socket_new(NULL, pair[0], 0);
297         bev2 = bufferevent_socket_new(NULL, pair[1], 0);
298
299         z_output = mm_calloc(sizeof(*z_output), 1);
300         r = deflateInit(z_output, Z_DEFAULT_COMPRESSION);
301         tt_int_op(r, ==, Z_OK);
302         z_input = mm_calloc(sizeof(*z_input), 1);
303         r = inflateInit(z_input);
304         tt_int_op(r, ==, Z_OK);
305
306         /* initialize filters */
307         bev1 = bufferevent_filter_new(bev1, NULL, zlib_output_filter,
308             BEV_OPT_CLOSE_ON_FREE, zlib_deflate_free, z_output);
309         bev2 = bufferevent_filter_new(bev2, zlib_input_filter,
310             NULL, BEV_OPT_CLOSE_ON_FREE, zlib_inflate_free, z_input);
311         bufferevent_setcb(bev1, readcb, writecb, errorcb, NULL);
312         bufferevent_setcb(bev2, readcb, writecb, errorcb, NULL);
313
314         bufferevent_disable(bev1, EV_READ);
315         bufferevent_enable(bev1, EV_WRITE);
316
317         bufferevent_enable(bev2, EV_READ);
318
319         for (i = 0; i < (int)sizeof(buffer); i++)
320                 buffer[i] = i;
321
322         /* break it up into multiple buffer chains */
323         bufferevent_write(bev1, buffer, 1800);
324         bufferevent_write(bev1, buffer + 1800, sizeof(buffer) - 1800);
325
326         /* we are done writing - we need to flush everything */
327         bufferevent_flush(bev1, EV_WRITE, BEV_FINISHED);
328
329         event_dispatch();
330
331         tt_want(infilter_calls);
332         tt_want(outfilter_calls);
333         tt_want(readcb_finished);
334         tt_want(writecb_finished);
335         tt_want(!errorcb_invoked);
336
337         test_ok = 1;
338 end:
339         if (bev1)
340                 bufferevent_free(bev1);
341         if (bev2)
342                 bufferevent_free(bev2);
343
344         if (pair[0] >= 0)
345                 evutil_closesocket(pair[0]);
346         if (pair[1] >= 0)
347                 evutil_closesocket(pair[1]);
348 }