2 * $Id: dsi_stream.c,v 1.14 2009-10-19 11:01:51 didg Exp $
4 * Copyright (c) 1998 Adrian Sun (asun@zoology.washington.edu)
5 * All rights reserved. See COPYRIGHT.
7 * this file provides the following functions:
8 * dsi_stream_write: just write a bunch of bytes.
9 * dsi_stream_read: just read a bunch of bytes.
10 * dsi_stream_send: send a DSI header + data.
11 * dsi_stream_receive: read a DSI header + data.
16 #endif /* HAVE_CONFIG_H */
29 #include <sys/types.h>
30 #include <sys/socket.h>
36 #include <atalk/logger.h>
38 #include <atalk/dsi.h>
39 #include <netatalk/endian.h>
41 #define min(a,b) ((a) < (b) ? (a) : (b))
44 #define MSG_MORE 0x8000
48 #define MSG_DONTWAIT 0x40
51 /* -------------------------
52 * we don't use a circular buffer.
54 static void dsi_init_buffer(DSI *dsi)
57 /* XXX config options */
58 dsi->maxsize = 6 * dsi->server_quantum;
60 dsi->maxsize = 6 * DSI_SERVQUANT_DEF;
61 dsi->buffer = malloc(dsi->maxsize);
65 dsi->start = dsi->buffer;
66 dsi->eof = dsi->buffer;
67 dsi->end = dsi->buffer + dsi->maxsize;
71 /* ---------------------- */
72 static void dsi_buffer(DSI *dsi)
74 fd_set readfds, writefds;
80 FD_SET( dsi->socket, &readfds);
81 FD_SET( dsi->socket, &writefds);
82 maxfd = dsi->socket +1;
84 FD_SET( dsi->socket, &readfds);
85 FD_SET( dsi->socket, &writefds);
86 if (select( maxfd, &readfds, &writefds, NULL, NULL) <= 0)
89 if ( !FD_ISSET(dsi->socket, &readfds)) {
90 /* nothing waiting in the read queue */
94 len = dsi->end - dsi->eof;
97 /* ouch, our buffer is full !
98 * fall back to blocking IO
99 * could block and disconnect but it's better than a cpu hog
105 len = read(dsi->socket, dsi->eof, len);
109 if ( FD_ISSET(dsi->socket, &writefds)) {
115 /* ------------------------------
116 * write raw data. return actual bytes read. checks against EINTR
117 * aren't necessary if all of the signals have SA_RESTART
119 size_t dsi_stream_write(DSI *dsi, void *data, const size_t length, int mode _U_)
124 /* FIXME sometime it's slower */
125 unsigned int flags = (mode)?MSG_MORE:0;
127 unsigned int flags = 0;
130 /* XXX there's no MSG_DONTWAIT in recv ?? so we have to play with ioctl
132 if (dsi->noblocking) {
133 flags |= MSG_DONTWAIT;
138 while (written < length) {
139 if ((-1 == (len = send(dsi->socket, (u_int8_t *) data + written,
140 length - written, flags)) && errno == EINTR) ||
145 if (dsi->noblocking && errno == EAGAIN) {
146 /* non blocking mode but will block
147 * read data in input queue.
153 LOG(log_error, logtype_default, "dsi_stream_write: %s", strerror(errno));
162 dsi->write_count += written;
166 /* ---------------------------------
168 static size_t from_buf(DSI *dsi, u_int8_t *buf, size_t count)
173 nbe = dsi->eof - dsi->start;
176 nbe = min((size_t)nbe, count);
177 memcpy(buf, dsi->start, nbe);
180 if (dsi->eof == dsi->start)
181 dsi->start = dsi->eof = dsi->buffer;
188 static ssize_t buf_read(DSI *dsi, u_int8_t *buf, size_t count)
195 nbe = from_buf(dsi, buf, count);
199 return read(dsi->socket, buf, count);
203 /* ---------------------------------------
204 * read raw data. return actual bytes read. this will wait until
205 * it gets length bytes
207 size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
213 while (stored < length) {
214 len = buf_read(dsi, (u_int8_t *) data + stored, length - stored);
215 if (len == -1 && errno == EINTR)
219 else { /* eof or error */
220 /* don't log EOF error if it's just after connect (OSX 10.3 probe) */
221 if (len || stored || dsi->read_count) {
222 LOG(log_error, logtype_default, "dsi_stream_read(%d): %s", len, (len < 0)?strerror(errno):"unexpected EOF");
228 dsi->read_count += stored;
232 /* ---------------------------------------
233 * read raw data. return actual bytes read. this will wait until
234 * it gets length bytes
236 static size_t dsi_buffered_stream_read(DSI *dsi, u_int8_t *data, const size_t length)
241 dsi_init_buffer(dsi);
242 len = from_buf(dsi, data, length);
243 dsi->read_count += len;
248 buflen = min(8192, dsi->end - dsi->eof);
251 ret = read(dsi->socket, dsi->eof, buflen);
255 return dsi_stream_read(dsi, data, length -len);
258 /* ---------------------------------------
260 void dsi_sleep(DSI *dsi, const int state)
265 /* ---------------------------------------
267 static void block_sig(DSI *dsi)
269 if (!dsi->sigblocked) sigprocmask(SIG_BLOCK, &dsi->sigblockset, &dsi->oldset);
272 /* ---------------------------------------
274 static void unblock_sig(DSI *dsi)
276 if (!dsi->sigblocked) sigprocmask(SIG_SETMASK, &dsi->oldset, NULL);
279 /* ---------------------------------------
280 * write data. 0 on failure. this assumes that dsi_len will never
281 * cause an overflow in the data buffer.
283 int dsi_stream_send(DSI *dsi, void *buf, size_t length)
285 char block[DSI_BLOCKSIZ];
290 #endif /* USE_WRITEV */
292 block[0] = dsi->header.dsi_flags;
293 block[1] = dsi->header.dsi_command;
294 memcpy(block + 2, &dsi->header.dsi_requestID,
295 sizeof(dsi->header.dsi_requestID));
296 memcpy(block + 4, &dsi->header.dsi_code, sizeof(dsi->header.dsi_code));
297 memcpy(block + 8, &dsi->header.dsi_len, sizeof(dsi->header.dsi_len));
298 memcpy(block + 12, &dsi->header.dsi_reserved,
299 sizeof(dsi->header.dsi_reserved));
301 if (!length) { /* just write the header */
302 length = (dsi_stream_write(dsi, block, sizeof(block), 0) == sizeof(block));
303 return length; /* really 0 on failure, 1 on success */
309 iov[0].iov_base = block;
310 iov[0].iov_len = sizeof(block);
311 iov[1].iov_base = buf;
312 iov[1].iov_len = length;
314 towrite = sizeof(block) + length;
315 dsi->write_count += towrite;
316 while (towrite > 0) {
317 if (((len = writev(dsi->socket, iov, 2)) == -1 && errno == EINTR) ||
321 if ((size_t)len == towrite) /* wrote everything out */
323 else if (len < 0) { /* error */
324 LOG(log_error, logtype_default, "dsi_stream_send: %s", strerror(errno));
330 if (towrite > length) { /* skip part of header */
331 iov[0].iov_base = (char *) iov[0].iov_base + len;
332 iov[0].iov_len -= len;
333 } else { /* skip to data */
334 if (iov[0].iov_len) {
335 len -= iov[0].iov_len;
338 iov[1].iov_base = (char *) iov[1].iov_base + len;
339 iov[1].iov_len -= len;
343 #else /* USE_WRITEV */
344 /* write the header then data */
345 if ((dsi_stream_write(dsi, block, sizeof(block), 1) != sizeof(block)) ||
346 (dsi_stream_write(dsi, buf, length, 0) != length)) {
350 #endif /* USE_WRITEV */
357 /* ---------------------------------------
358 * read data. function on success. 0 on failure. data length gets
359 * stored in length variable. this should really use size_t's, but
360 * that would require changes elsewhere. */
361 int dsi_stream_receive(DSI *dsi, void *buf, const size_t ilength,
364 char block[DSI_BLOCKSIZ];
366 /* read in the header */
367 if (dsi_buffered_stream_read(dsi, block, sizeof(block)) != sizeof(block))
370 dsi->header.dsi_flags = block[0];
371 dsi->header.dsi_command = block[1];
372 /* FIXME, not the right place,
373 but we get a server disconnect without reason in the log
376 LOG(log_error, logtype_default, "dsi_stream_receive: invalid packet, fatal");
380 memcpy(&dsi->header.dsi_requestID, block + 2,
381 sizeof(dsi->header.dsi_requestID));
382 memcpy(&dsi->header.dsi_code, block + 4, sizeof(dsi->header.dsi_code));
383 memcpy(&dsi->header.dsi_len, block + 8, sizeof(dsi->header.dsi_len));
384 memcpy(&dsi->header.dsi_reserved, block + 12,
385 sizeof(dsi->header.dsi_reserved));
386 dsi->clientID = ntohs(dsi->header.dsi_requestID);
388 /* make sure we don't over-write our buffers. */
389 *rlength = min(ntohl(dsi->header.dsi_len), ilength);
390 if (dsi_stream_read(dsi, buf, *rlength) != *rlength)