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Diffstat (limited to 'src/transport/tcp_server_mst_legacy.c')
-rw-r--r--src/transport/tcp_server_mst_legacy.c307
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 */
41struct 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 */
82struct GNUNET_SERVER_MessageStreamTokenizer *
83GNUNET_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 */
112int
113GNUNET_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 {
135do_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 }
269copy:
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 */
299void
300GNUNET_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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-30 12:40:58 +0000