2 * $Id: dsi_stream.c,v 1.11 2003-03-12 15:07:06 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 */
24 #endif /* HAVE_UNISTD_H */
27 #include <sys/types.h>
30 #endif /* USE_WRITEV */
31 #include <atalk/logger.h>
33 #include <atalk/dsi.h>
34 #include <netatalk/endian.h>
36 #define min(a,b) ((a) < (b) ? (a) : (b))
39 /* write raw data. return actual bytes read. checks against EINTR
40 * aren't necessary if all of the signals have SA_RESTART
42 size_t dsi_stream_write(DSI *dsi, void *data, const size_t length)
48 while (written < length) {
49 if ((-1 == (len = write(dsi->socket, (u_int8_t *) data + written,
50 length - written)) && errno == EINTR) ||
55 LOG(log_error, logtype_default, "dsi_stream_write: %s", strerror(errno));
62 dsi->write_count += written;
66 /* read raw data. return actual bytes read. this will wait until
67 * it gets length bytes */
68 size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
74 while (stored < length) {
75 len = read(dsi->socket, (u_int8_t *) data + stored, length - stored);
76 if (len == -1 && errno == EINTR)
80 else { /* eof or error */
81 LOG(log_error, logtype_default, "dsi_stream_read(%d): %s", len, (len < 0)?strerror(errno):"unexpected EOF");
86 dsi->read_count += stored;
90 void dsi_sleep(DSI *dsi, const int state)
95 /* write data. 0 on failure. this assumes that dsi_len will never
96 * cause an overflow in the data buffer. */
97 int dsi_stream_send(DSI *dsi, void *buf, size_t length)
99 char block[DSI_BLOCKSIZ];
105 #endif /* USE_WRITEV */
107 block[0] = dsi->header.dsi_flags;
108 block[1] = dsi->header.dsi_command;
109 memcpy(block + 2, &dsi->header.dsi_requestID,
110 sizeof(dsi->header.dsi_requestID));
111 memcpy(block + 4, &dsi->header.dsi_code, sizeof(dsi->header.dsi_code));
112 memcpy(block + 8, &dsi->header.dsi_len, sizeof(dsi->header.dsi_len));
113 memcpy(block + 12, &dsi->header.dsi_reserved,
114 sizeof(dsi->header.dsi_reserved));
117 sigprocmask(SIG_BLOCK, &dsi->sigblockset, &oldset);
119 if (!length) { /* just write the header */
120 length = (dsi_stream_write(dsi, block, sizeof(block)) == sizeof(block));
121 sigprocmask(SIG_SETMASK, &oldset, NULL);
122 return length; /* really 0 on failure, 1 on success */
126 iov[0].iov_base = block;
127 iov[0].iov_len = sizeof(block);
128 iov[1].iov_base = buf;
129 iov[1].iov_len = length;
131 towrite = sizeof(block) + length;
132 dsi->write_count += towrite;
133 while (towrite > 0) {
134 if (((len = writev(dsi->socket, iov, 2)) == -1 && errno == EINTR) ||
138 if (len == towrite) /* wrote everything out */
140 else if (len < 0) { /* error */
141 LOG(log_error, logtype_default, "dsi_stream_send: %s", strerror(errno));
142 sigprocmask(SIG_SETMASK, &oldset, NULL);
147 if (towrite > length) { /* skip part of header */
148 iov[0].iov_base = (char *) iov[0].iov_base + len;
149 iov[0].iov_len -= len;
150 } else { /* skip to data */
151 if (iov[0].iov_len) {
152 len -= iov[0].iov_len;
155 iov[1].iov_base = (char *) iov[1].iov_base + len;
156 iov[1].iov_len -= len;
160 #else /* USE_WRITEV */
161 /* write the header then data */
162 if ((dsi_stream_write(dsi, block, sizeof(block)) != sizeof(block)) ||
163 (dsi_stream_write(dsi, buf, length) != length)) {
164 sigprocmask(SIG_SETMASK, &oldset, NULL);
167 #endif /* USE_WRITEV */
169 sigprocmask(SIG_SETMASK, &oldset, NULL);
174 /* read data. function on success. 0 on failure. data length gets
175 * stored in length variable. this should really use size_t's, but
176 * that would require changes elsewhere. */
177 int dsi_stream_receive(DSI *dsi, void *buf, const size_t ilength,
180 char block[DSI_BLOCKSIZ];
182 /* read in the header */
183 if (dsi_stream_read(dsi, block, sizeof(block)) != sizeof(block))
186 dsi->header.dsi_flags = block[0];
187 dsi->header.dsi_command = block[1];
188 /* FIXME, not the right place,
189 but we get a server disconnect without reason in the log
192 LOG(log_error, logtype_default, "dsi_stream_receive: invalid packet, fatal");
196 memcpy(&dsi->header.dsi_requestID, block + 2,
197 sizeof(dsi->header.dsi_requestID));
198 memcpy(&dsi->header.dsi_code, block + 4, sizeof(dsi->header.dsi_code));
199 memcpy(&dsi->header.dsi_len, block + 8, sizeof(dsi->header.dsi_len));
200 memcpy(&dsi->header.dsi_reserved, block + 12,
201 sizeof(dsi->header.dsi_reserved));
202 dsi->clientID = ntohs(dsi->header.dsi_requestID);
204 /* make sure we don't over-write our buffers. */
205 *rlength = min(ntohl(dsi->header.dsi_len), ilength);
206 if (dsi_stream_read(dsi, buf, *rlength) != *rlength)