2 * Copyright (c) 1998 Adrian Sun (asun@zoology.washington.edu)
3 * All rights reserved. See COPYRIGHT.
5 * this file provides the following functions:
6 * dsi_stream_write: just write a bunch of bytes.
7 * dsi_stream_read: just read a bunch of bytes.
8 * dsi_stream_send: send a DSI header + data.
9 * dsi_stream_receive: read a DSI header + data.
23 #include <sys/types.h>
29 #include <atalk/dsi.h>
30 #include <netatalk/endian.h>
32 #define min(a,b) ((a) < (b) ? (a) : (b))
35 /* write raw data. return actual bytes read. checks against EINTR
36 * aren't necessary if all of the signals have SA_RESTART
38 size_t dsi_stream_write(DSI *dsi, void *data, const size_t length)
44 while (written < length) {
45 if (((len = write(dsi->socket, (u_int8_t *) data + written,
46 length - written)) == -1 && errno == EINTR) ||
51 syslog(LOG_ERR, "dsi_stream_write: %m");
58 dsi->write_count += written;
62 /* read raw data. return actual bytes read. this will wait until
63 * it gets length bytes */
64 size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
70 while (stored < length) {
71 if ((len = read(dsi->socket, (u_int8_t *) data + stored,
72 length - stored)) == -1 && errno == EINTR)
77 else {/* eof or error */
78 syslog(LOG_ERR, "dsi_stream_read(%d): %m", len);
83 dsi->read_count += stored;
88 /* write data. 0 on failure. this assumes that dsi_len will never
89 * cause an overflow in the data buffer. */
90 int dsi_stream_send(DSI *dsi, void *buf, size_t length)
92 char block[DSI_BLOCKSIZ];
100 block[0] = dsi->header.dsi_flags;
101 block[1] = dsi->header.dsi_command;
102 memcpy(block + 2, &dsi->header.dsi_requestID,
103 sizeof(dsi->header.dsi_requestID));
104 memcpy(block + 4, &dsi->header.dsi_code, sizeof(dsi->header.dsi_code));
105 memcpy(block + 8, &dsi->header.dsi_len, sizeof(dsi->header.dsi_len));
106 memcpy(block + 12, &dsi->header.dsi_reserved,
107 sizeof(dsi->header.dsi_reserved));
110 sigprocmask(SIG_BLOCK, &dsi->sigblockset, &oldset);
112 if (!length) { /* just write the header */
113 length = (dsi_stream_write(dsi, block, sizeof(block)) == sizeof(block));
114 sigprocmask(SIG_SETMASK, &oldset, NULL);
115 return length; /* really 0 on failure, 1 on success */
119 iov[0].iov_base = block;
120 iov[0].iov_len = sizeof(block);
121 iov[1].iov_base = buf;
122 iov[1].iov_len = length;
124 towrite = sizeof(block) + length;
125 dsi->write_count += towrite;
126 while (towrite > 0) {
127 if (((len = writev(dsi->socket, iov, 2)) == -1 && errno == EINTR) ||
131 if (len == towrite) /* wrote everything out */
133 else if (len < 0) { /* error */
134 syslog(LOG_ERR, "dsi_stream_send: %m");
135 sigprocmask(SIG_SETMASK, &oldset, NULL);
140 if (towrite > length) { /* skip part of header */
141 iov[0].iov_base = (char *) iov[0].iov_base + len;
142 iov[0].iov_len -= len;
143 } else { /* skip to data */
144 if (iov[0].iov_len) {
145 len -= iov[0].iov_len;
148 iov[1].iov_base = (char *) iov[1].iov_base + len;
149 iov[1].iov_len -= len;
154 /* write the header then data */
155 if ((dsi_stream_write(dsi, block, sizeof(block)) != sizeof(block)) ||
156 (dsi_stream_write(dsi, buf, length) != length)) {
157 sigprocmask(SIG_SETMASK, &oldset, NULL);
162 sigprocmask(SIG_SETMASK, &oldset, NULL);
167 /* read data. function on success. 0 on failure. data length gets
168 * stored in length variable. this should really use size_t's, but
169 * that would require changes elsewhere. */
170 int dsi_stream_receive(DSI *dsi, void *buf, const int ilength,
173 char block[DSI_BLOCKSIZ];
175 /* read in the header */
176 if (dsi_stream_read(dsi, block, sizeof(block)) != sizeof(block))
179 dsi->header.dsi_flags = block[0];
180 dsi->header.dsi_command = block[1];
181 memcpy(&dsi->header.dsi_requestID, block + 2,
182 sizeof(dsi->header.dsi_requestID));
183 memcpy(&dsi->header.dsi_code, block + 4, sizeof(dsi->header.dsi_code));
184 memcpy(&dsi->header.dsi_len, block + 8, sizeof(dsi->header.dsi_len));
185 memcpy(&dsi->header.dsi_reserved, block + 12,
186 sizeof(dsi->header.dsi_reserved));
187 dsi->clientID = ntohs(dsi->header.dsi_requestID);
189 /* make sure we don't over-write our buffers. */
190 *rlength = min(ntohl(dsi->header.dsi_len), ilength);
191 if (dsi_stream_read(dsi, buf, *rlength) != *rlength)