2 * $Id: dsi_stream.c,v 1.11.6.1 2003-10-17 00:01:14 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
47 /* write raw data. return actual bytes read. checks against EINTR
48 * aren't necessary if all of the signals have SA_RESTART
50 size_t dsi_stream_write(DSI *dsi, void *data, const size_t length, int mode)
54 unsigned int flags = (mode)?MSG_MORE:0;
57 while (written < length) {
58 if ((-1 == (len = send(dsi->socket, (u_int8_t *) data + written,
59 length - written, flags)) && errno == EINTR) ||
64 LOG(log_error, logtype_default, "dsi_stream_write: %s", strerror(errno));
71 dsi->write_count += written;
75 /* ---------------------------------------
76 * read raw data. return actual bytes read. this will wait until
77 * it gets length bytes
79 size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
85 while (stored < length) {
86 len = read(dsi->socket, (u_int8_t *) data + stored, length - stored);
87 if (len == -1 && errno == EINTR)
91 else { /* eof or error */
92 LOG(log_error, logtype_default, "dsi_stream_read(%d): %s", len, (len < 0)?strerror(errno):"unexpected EOF");
97 dsi->read_count += stored;
101 /* ---------------------------------------
103 void dsi_sleep(DSI *dsi, const int state)
108 /* ---------------------------------------
110 static void block_sig(DSI *dsi)
112 if (!dsi->sigblocked) sigprocmask(SIG_BLOCK, &dsi->sigblockset, &dsi->oldset);
115 /* ---------------------------------------
117 static void unblock_sig(DSI *dsi)
119 if (!dsi->sigblocked) sigprocmask(SIG_SETMASK, &dsi->oldset, NULL);
122 /* ---------------------------------------
123 * write data. 0 on failure. this assumes that dsi_len will never
124 * cause an overflow in the data buffer.
126 int dsi_stream_send(DSI *dsi, void *buf, size_t length)
128 char block[DSI_BLOCKSIZ];
133 #endif /* USE_WRITEV */
135 block[0] = dsi->header.dsi_flags;
136 block[1] = dsi->header.dsi_command;
137 memcpy(block + 2, &dsi->header.dsi_requestID,
138 sizeof(dsi->header.dsi_requestID));
139 memcpy(block + 4, &dsi->header.dsi_code, sizeof(dsi->header.dsi_code));
140 memcpy(block + 8, &dsi->header.dsi_len, sizeof(dsi->header.dsi_len));
141 memcpy(block + 12, &dsi->header.dsi_reserved,
142 sizeof(dsi->header.dsi_reserved));
147 if (!length) { /* just write the header */
148 length = (dsi_stream_write(dsi, block, sizeof(block), 0) == sizeof(block));
150 return length; /* really 0 on failure, 1 on success */
154 iov[0].iov_base = block;
155 iov[0].iov_len = sizeof(block);
156 iov[1].iov_base = buf;
157 iov[1].iov_len = length;
159 towrite = sizeof(block) + length;
160 dsi->write_count += towrite;
161 while (towrite > 0) {
162 if (((len = writev(dsi->socket, iov, 2)) == -1 && errno == EINTR) ||
166 if (len == towrite) /* wrote everything out */
168 else if (len < 0) { /* error */
169 LOG(log_error, logtype_default, "dsi_stream_send: %s", strerror(errno));
175 if (towrite > length) { /* skip part of header */
176 iov[0].iov_base = (char *) iov[0].iov_base + len;
177 iov[0].iov_len -= len;
178 } else { /* skip to data */
179 if (iov[0].iov_len) {
180 len -= iov[0].iov_len;
183 iov[1].iov_base = (char *) iov[1].iov_base + len;
184 iov[1].iov_len -= len;
188 #else /* USE_WRITEV */
189 /* write the header then data */
190 if ((dsi_stream_write(dsi, block, sizeof(block), 1) != sizeof(block)) ||
191 (dsi_stream_write(dsi, buf, length, 0) != length)) {
195 #endif /* USE_WRITEV */
202 /* ---------------------------------------
203 * read data. function on success. 0 on failure. data length gets
204 * stored in length variable. this should really use size_t's, but
205 * that would require changes elsewhere. */
206 int dsi_stream_receive(DSI *dsi, void *buf, const size_t ilength,
209 char block[DSI_BLOCKSIZ];
211 /* read in the header */
212 if (dsi_stream_read(dsi, block, sizeof(block)) != sizeof(block))
215 dsi->header.dsi_flags = block[0];
216 dsi->header.dsi_command = block[1];
217 /* FIXME, not the right place,
218 but we get a server disconnect without reason in the log
221 LOG(log_error, logtype_default, "dsi_stream_receive: invalid packet, fatal");
225 memcpy(&dsi->header.dsi_requestID, block + 2,
226 sizeof(dsi->header.dsi_requestID));
227 memcpy(&dsi->header.dsi_code, block + 4, sizeof(dsi->header.dsi_code));
228 memcpy(&dsi->header.dsi_len, block + 8, sizeof(dsi->header.dsi_len));
229 memcpy(&dsi->header.dsi_reserved, block + 12,
230 sizeof(dsi->header.dsi_reserved));
231 dsi->clientID = ntohs(dsi->header.dsi_requestID);
233 /* make sure we don't over-write our buffers. */
234 *rlength = min(ntohl(dsi->header.dsi_len), ilength);
235 if (dsi_stream_read(dsi, buf, *rlength) != *rlength)