diff options
Diffstat (limited to 'src/transport/tcp_server_mst_legacy.c')
-rw-r--r-- | src/transport/tcp_server_mst_legacy.c | 307 |
1 files changed, 0 insertions, 307 deletions
diff --git a/src/transport/tcp_server_mst_legacy.c b/src/transport/tcp_server_mst_legacy.c deleted file mode 100644 index bed6874c9..000000000 --- a/src/transport/tcp_server_mst_legacy.c +++ /dev/null | |||
@@ -1,307 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2010 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file util/server_mst.c | ||
23 | * @brief convenience functions for handling inbound message buffers | ||
24 | * @author Christian Grothoff | ||
25 | */ | ||
26 | |||
27 | #include "platform.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | |||
30 | |||
31 | #if HAVE_UNALIGNED_64_ACCESS | ||
32 | #define ALIGN_FACTOR 4 | ||
33 | #else | ||
34 | #define ALIGN_FACTOR 8 | ||
35 | #endif | ||
36 | |||
37 | |||
38 | /** | ||
39 | * Handle to a message stream tokenizer. | ||
40 | */ | ||
41 | struct GNUNET_SERVER_MessageStreamTokenizer | ||
42 | { | ||
43 | /** | ||
44 | * Function to call on completed messages. | ||
45 | */ | ||
46 | GNUNET_SERVER_MessageTokenizerCallback cb; | ||
47 | |||
48 | /** | ||
49 | * Closure for @e cb. | ||
50 | */ | ||
51 | void *cb_cls; | ||
52 | |||
53 | /** | ||
54 | * Size of the buffer (starting at @e hdr). | ||
55 | */ | ||
56 | size_t curr_buf; | ||
57 | |||
58 | /** | ||
59 | * How many bytes in buffer have we already processed? | ||
60 | */ | ||
61 | size_t off; | ||
62 | |||
63 | /** | ||
64 | * How many bytes in buffer are valid right now? | ||
65 | */ | ||
66 | size_t pos; | ||
67 | |||
68 | /** | ||
69 | * Beginning of the buffer. Typed like this to force alignment. | ||
70 | */ | ||
71 | struct GNUNET_MessageHeader *hdr; | ||
72 | }; | ||
73 | |||
74 | |||
75 | /** | ||
76 | * Create a message stream tokenizer. | ||
77 | * | ||
78 | * @param cb function to call on completed messages | ||
79 | * @param cb_cls closure for @a cb | ||
80 | * @return handle to tokenizer | ||
81 | */ | ||
82 | struct GNUNET_SERVER_MessageStreamTokenizer * | ||
83 | GNUNET_SERVER_mst_create (GNUNET_SERVER_MessageTokenizerCallback cb, | ||
84 | void *cb_cls) | ||
85 | { | ||
86 | struct GNUNET_SERVER_MessageStreamTokenizer *ret; | ||
87 | |||
88 | ret = GNUNET_new (struct GNUNET_SERVER_MessageStreamTokenizer); | ||
89 | ret->hdr = GNUNET_malloc (GNUNET_MIN_MESSAGE_SIZE); | ||
90 | ret->curr_buf = GNUNET_MIN_MESSAGE_SIZE; | ||
91 | ret->cb = cb; | ||
92 | ret->cb_cls = cb_cls; | ||
93 | return ret; | ||
94 | } | ||
95 | |||
96 | |||
97 | /** | ||
98 | * Add incoming data to the receive buffer and call the | ||
99 | * callback for all complete messages. | ||
100 | * | ||
101 | * @param mst tokenizer to use | ||
102 | * @param client_identity ID of client for which this is a buffer | ||
103 | * @param buf input data to add | ||
104 | * @param size number of bytes in @a buf | ||
105 | * @param purge should any excess bytes in the buffer be discarded | ||
106 | * (i.e. for packet-based services like UDP) | ||
107 | * @param one_shot only call callback once, keep rest of message in buffer | ||
108 | * @return #GNUNET_OK if we are done processing (need more data) | ||
109 | * #GNUNET_NO if @a one_shot was set and we have another message ready | ||
110 | * #GNUNET_SYSERR if the data stream is corrupt | ||
111 | */ | ||
112 | int | ||
113 | GNUNET_SERVER_mst_receive (struct GNUNET_SERVER_MessageStreamTokenizer *mst, | ||
114 | void *client_identity, | ||
115 | const char *buf, size_t size, | ||
116 | int purge, int one_shot) | ||
117 | { | ||
118 | const struct GNUNET_MessageHeader *hdr; | ||
119 | size_t delta; | ||
120 | uint16_t want; | ||
121 | char *ibuf; | ||
122 | int need_align; | ||
123 | unsigned long offset; | ||
124 | int ret; | ||
125 | |||
126 | GNUNET_assert (mst->off <= mst->pos); | ||
127 | GNUNET_assert (mst->pos <= mst->curr_buf); | ||
128 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
129 | "Server-mst receives %u bytes with %u bytes already in private buffer\n", | ||
130 | (unsigned int) size, (unsigned int) (mst->pos - mst->off)); | ||
131 | ret = GNUNET_OK; | ||
132 | ibuf = (char *) mst->hdr; | ||
133 | while (mst->pos > 0) | ||
134 | { | ||
135 | do_align: | ||
136 | GNUNET_assert (mst->pos >= mst->off); | ||
137 | if ((mst->curr_buf - mst->off < sizeof(struct GNUNET_MessageHeader)) || | ||
138 | (0 != (mst->off % ALIGN_FACTOR))) | ||
139 | { | ||
140 | /* need to align or need more space */ | ||
141 | mst->pos -= mst->off; | ||
142 | memmove (ibuf, &ibuf[mst->off], mst->pos); | ||
143 | mst->off = 0; | ||
144 | } | ||
145 | if (mst->pos - mst->off < sizeof(struct GNUNET_MessageHeader)) | ||
146 | { | ||
147 | delta = | ||
148 | GNUNET_MIN (sizeof(struct GNUNET_MessageHeader) | ||
149 | - (mst->pos - mst->off), size); | ||
150 | GNUNET_memcpy (&ibuf[mst->pos], buf, delta); | ||
151 | mst->pos += delta; | ||
152 | buf += delta; | ||
153 | size -= delta; | ||
154 | } | ||
155 | if (mst->pos - mst->off < sizeof(struct GNUNET_MessageHeader)) | ||
156 | { | ||
157 | if (purge) | ||
158 | { | ||
159 | mst->off = 0; | ||
160 | mst->pos = 0; | ||
161 | } | ||
162 | return GNUNET_OK; | ||
163 | } | ||
164 | hdr = (const struct GNUNET_MessageHeader *) &ibuf[mst->off]; | ||
165 | want = ntohs (hdr->size); | ||
166 | if (want < sizeof(struct GNUNET_MessageHeader)) | ||
167 | { | ||
168 | GNUNET_break_op (0); | ||
169 | return GNUNET_SYSERR; | ||
170 | } | ||
171 | if ((mst->curr_buf - mst->off < want) && | ||
172 | (mst->off > 0)) | ||
173 | { | ||
174 | /* can get more space by moving */ | ||
175 | mst->pos -= mst->off; | ||
176 | memmove (ibuf, &ibuf[mst->off], mst->pos); | ||
177 | mst->off = 0; | ||
178 | } | ||
179 | if (mst->curr_buf < want) | ||
180 | { | ||
181 | /* need to get more space by growing buffer */ | ||
182 | GNUNET_assert (0 == mst->off); | ||
183 | mst->hdr = GNUNET_realloc (mst->hdr, want); | ||
184 | ibuf = (char *) mst->hdr; | ||
185 | mst->curr_buf = want; | ||
186 | } | ||
187 | hdr = (const struct GNUNET_MessageHeader *) &ibuf[mst->off]; | ||
188 | if (mst->pos - mst->off < want) | ||
189 | { | ||
190 | delta = GNUNET_MIN (want - (mst->pos - mst->off), size); | ||
191 | GNUNET_assert (mst->pos + delta <= mst->curr_buf); | ||
192 | GNUNET_memcpy (&ibuf[mst->pos], buf, delta); | ||
193 | mst->pos += delta; | ||
194 | buf += delta; | ||
195 | size -= delta; | ||
196 | } | ||
197 | if (mst->pos - mst->off < want) | ||
198 | { | ||
199 | if (purge) | ||
200 | { | ||
201 | mst->off = 0; | ||
202 | mst->pos = 0; | ||
203 | } | ||
204 | return GNUNET_OK; | ||
205 | } | ||
206 | if (one_shot == GNUNET_SYSERR) | ||
207 | { | ||
208 | /* cannot call callback again, but return value saying that | ||
209 | * we have another full message in the buffer */ | ||
210 | ret = GNUNET_NO; | ||
211 | goto copy; | ||
212 | } | ||
213 | if (one_shot == GNUNET_YES) | ||
214 | one_shot = GNUNET_SYSERR; | ||
215 | mst->off += want; | ||
216 | if (GNUNET_SYSERR == mst->cb (mst->cb_cls, client_identity, hdr)) | ||
217 | return GNUNET_SYSERR; | ||
218 | if (mst->off == mst->pos) | ||
219 | { | ||
220 | /* reset to beginning of buffer, it's free right now! */ | ||
221 | mst->off = 0; | ||
222 | mst->pos = 0; | ||
223 | } | ||
224 | } | ||
225 | GNUNET_assert (0 == mst->pos); | ||
226 | while (size > 0) | ||
227 | { | ||
228 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
229 | "Server-mst has %u bytes left in inbound buffer\n", | ||
230 | (unsigned int) size); | ||
231 | if (size < sizeof(struct GNUNET_MessageHeader)) | ||
232 | break; | ||
233 | offset = (unsigned long) buf; | ||
234 | need_align = (0 != (offset % ALIGN_FACTOR)) ? GNUNET_YES : GNUNET_NO; | ||
235 | if (GNUNET_NO == need_align) | ||
236 | { | ||
237 | /* can try to do zero-copy and process directly from original buffer */ | ||
238 | hdr = (const struct GNUNET_MessageHeader *) buf; | ||
239 | want = ntohs (hdr->size); | ||
240 | if (want < sizeof(struct GNUNET_MessageHeader)) | ||
241 | { | ||
242 | GNUNET_break_op (0); | ||
243 | mst->off = 0; | ||
244 | return GNUNET_SYSERR; | ||
245 | } | ||
246 | if (size < want) | ||
247 | break; /* or not: buffer incomplete, so copy to private buffer... */ | ||
248 | if (one_shot == GNUNET_SYSERR) | ||
249 | { | ||
250 | /* cannot call callback again, but return value saying that | ||
251 | * we have another full message in the buffer */ | ||
252 | ret = GNUNET_NO; | ||
253 | goto copy; | ||
254 | } | ||
255 | if (one_shot == GNUNET_YES) | ||
256 | one_shot = GNUNET_SYSERR; | ||
257 | if (GNUNET_SYSERR == mst->cb (mst->cb_cls, client_identity, hdr)) | ||
258 | return GNUNET_SYSERR; | ||
259 | buf += want; | ||
260 | size -= want; | ||
261 | } | ||
262 | else | ||
263 | { | ||
264 | /* need to copy to private buffer to align; | ||
265 | * yes, we go a bit more spaghetti than usual here */ | ||
266 | goto do_align; | ||
267 | } | ||
268 | } | ||
269 | copy: | ||
270 | if ((size > 0) && (! purge)) | ||
271 | { | ||
272 | if (size + mst->pos > mst->curr_buf) | ||
273 | { | ||
274 | mst->hdr = GNUNET_realloc (mst->hdr, size + mst->pos); | ||
275 | ibuf = (char *) mst->hdr; | ||
276 | mst->curr_buf = size + mst->pos; | ||
277 | } | ||
278 | GNUNET_assert (size + mst->pos <= mst->curr_buf); | ||
279 | GNUNET_memcpy (&ibuf[mst->pos], buf, size); | ||
280 | mst->pos += size; | ||
281 | } | ||
282 | if (purge) | ||
283 | { | ||
284 | mst->off = 0; | ||
285 | mst->pos = 0; | ||
286 | } | ||
287 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
288 | "Server-mst leaves %u bytes in private buffer\n", | ||
289 | (unsigned int) (mst->pos - mst->off)); | ||
290 | return ret; | ||
291 | } | ||
292 | |||
293 | |||
294 | /** | ||
295 | * Destroys a tokenizer. | ||
296 | * | ||
297 | * @param mst tokenizer to destroy | ||
298 | */ | ||
299 | void | ||
300 | GNUNET_SERVER_mst_destroy (struct GNUNET_SERVER_MessageStreamTokenizer *mst) | ||
301 | { | ||
302 | GNUNET_free (mst->hdr); | ||
303 | GNUNET_free (mst); | ||
304 | } | ||
305 | |||
306 | |||
307 | /* end of server_mst.c */ | ||