2 Copyright (C) Andrew Tridgell 1996
3 Copyright (C) Paul Mackerras 1996
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 Utilities used in rsync
27 /* if no timeout is specified then use a 60 second select timeout */
28 #define SELECT_TIMEOUT 60
30 static int io_multiplexing_out;
31 static int io_multiplexing_in;
32 static int multiplex_in_fd;
33 static int multiplex_out_fd;
34 static time_t last_io;
35 static int eof_error=1;
37 extern int io_timeout;
38 extern struct stats stats;
40 static int buffer_f_in = -1;
42 void setup_readbuffer(int f_in)
47 static void check_timeout(void)
51 if (!io_timeout) return;
60 if (last_io && io_timeout && (t-last_io) >= io_timeout) {
61 rprintf(FERROR,"io timeout after %d second - exiting\n",
63 exit_cleanup(RERR_TIMEOUT);
68 static char *read_buffer;
69 static char *read_buffer_p;
70 static int read_buffer_len;
71 static int read_buffer_size;
73 static int no_flush_read;
75 /* read from a socket with IO timeout. return the number of
76 bytes read. If no bytes can be read then exit, never return
78 static int read_timeout(int fd, char *buf, int len)
92 tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
95 if (select(fd+1, &fds, NULL, NULL, &tv) != 1) {
100 n = read(fd, buf, len);
107 last_io = time(NULL);
111 if (n == -1 && errno == EINTR) {
117 rprintf(FERROR,"unexpected EOF in read_timeout\n");
119 exit_cleanup(RERR_STREAMIO);
122 rprintf(FERROR,"read error: %s\n", strerror(errno));
123 exit_cleanup(RERR_STREAMIO);
129 /* continue trying to read len bytes - don't return until len
131 static void read_loop(int fd, char *buf, int len)
134 int n = read_timeout(fd, buf, len);
141 /* read from the file descriptor handling multiplexing -
142 return number of bytes read
144 static int read_unbuffered(int fd, char *buf, int len)
146 static int remaining;
151 if (!io_multiplexing_in || fd != multiplex_in_fd)
152 return read_timeout(fd, buf, len);
156 len = MIN(len, remaining);
157 read_loop(fd, buf, len);
163 read_loop(fd, ibuf, 4);
166 remaining = tag & 0xFFFFFF;
169 if (tag == MPLEX_BASE) continue;
173 if (tag != FERROR && tag != FINFO) {
174 rprintf(FERROR,"unexpected tag %d\n", tag);
175 exit_cleanup(RERR_STREAMIO);
178 if (remaining > sizeof(line)-1) {
179 rprintf(FERROR,"multiplexing overflow %d\n\n",
181 exit_cleanup(RERR_STREAMIO);
184 read_loop(fd, line, remaining);
187 rprintf(tag,"%s", line);
196 /* This function was added to overcome a deadlock problem when using
197 * ssh. It looks like we can't allow our receive queue to get full or
198 * ssh will clag up. Uggh. */
199 static void read_check(int f)
205 if (read_buffer_len == 0) {
206 read_buffer_p = read_buffer;
209 if (n > MAX_READ_BUFFER/4)
210 n = MAX_READ_BUFFER/4;
212 if (read_buffer_p != read_buffer) {
213 memmove(read_buffer,read_buffer_p,read_buffer_len);
214 read_buffer_p = read_buffer;
217 if (n > (read_buffer_size - read_buffer_len)) {
218 read_buffer_size += n;
219 read_buffer = (char *)Realloc(read_buffer,read_buffer_size);
220 if (!read_buffer) out_of_memory("read check");
221 read_buffer_p = read_buffer;
224 n = read_unbuffered(f,read_buffer+read_buffer_len,n);
225 read_buffer_len += n;
229 /* do a buffered read from fd. don't return until all N bytes
230 have been read. If all N can't be read then exit with an error */
231 static void readfd(int fd,char *buffer,int N)
236 if ((read_buffer_len < N) && (N < 1024)) {
237 read_check(buffer_f_in);
241 if (read_buffer_len > 0 && buffer_f_in == fd) {
242 ret = MIN(read_buffer_len,N-total);
243 memcpy(buffer+total,read_buffer_p,ret);
244 read_buffer_p += ret;
245 read_buffer_len -= ret;
254 ret = read_unbuffered(fd,buffer + total,N-total);
258 stats.total_read += total;
262 int32 read_int(int f)
269 if (ret == (int32)0xffffffff) return -1;
273 int64 read_longint(int f)
275 extern int remote_version;
280 if ((int32)ret != (int32)0xffffffff) {
285 rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
286 exit_cleanup(RERR_UNSUPPORTED);
288 if (remote_version >= 16) {
290 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
297 void read_buf(int f,char *buf,int len)
302 void read_sbuf(int f,char *buf,int len)
308 unsigned char read_byte(int f)
311 read_buf(f,(char *)&c,1);
317 /* write len bytes to fd, possibly reading from buffer_f_in if set
318 in order to unclog the pipe. don't return until all len
319 bytes have been written */
320 static void writefd_unbuffered(int fd,char *buf,int len)
330 while (total < len) {
336 if (!no_flush_read) {
337 reading = (buffer_f_in != -1);
341 FD_SET(buffer_f_in,&r_fds);
342 if (buffer_f_in > fd)
343 fd_count = buffer_f_in+1;
346 tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
349 count = select(fd_count,
359 if (reading && FD_ISSET(buffer_f_in, &r_fds)) {
360 read_check(buffer_f_in);
363 if (FD_ISSET(fd, &w_fds)) {
365 int ret = write(fd,buf+total,n?n:1);
367 if (ret == -1 && errno == EINTR) {
372 rprintf(FERROR,"erroring writing %d bytes - exiting\n", len);
373 exit_cleanup(RERR_STREAMIO);
379 last_io = time(NULL);
387 static char *io_buffer;
388 static int io_buffer_count;
390 void io_start_buffering(int fd)
392 if (io_buffer) return;
393 multiplex_out_fd = fd;
394 io_buffer = (char *)malloc(IO_BUFFER_SIZE+4);
395 if (!io_buffer) out_of_memory("writefd");
398 /* leave room for the multiplex header in case it's needed */
404 int fd = multiplex_out_fd;
405 if (!io_buffer_count || no_flush) return;
407 if (io_multiplexing_out) {
408 SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count);
409 writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4);
411 writefd_unbuffered(fd, io_buffer, io_buffer_count);
416 void io_end_buffering(int fd)
419 if (!io_multiplexing_out) {
425 static void writefd(int fd,char *buf,int len)
427 stats.total_written += len;
430 writefd_unbuffered(fd, buf, len);
435 int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count);
437 memcpy(io_buffer+io_buffer_count, buf, n);
440 io_buffer_count += n;
443 if (io_buffer_count == IO_BUFFER_SIZE) io_flush();
448 void write_int(int f,int32 x)
455 void write_longint(int f, int64 x)
457 extern int remote_version;
460 if (remote_version < 16 || x <= 0x7FFFFFFF) {
461 write_int(f, (int)x);
465 write_int(f, (int32)0xFFFFFFFF);
466 SIVAL(b,0,(x&0xFFFFFFFF));
467 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
472 void write_buf(int f,char *buf,int len)
477 /* write a string to the connection */
478 static void write_sbuf(int f,char *buf)
480 write_buf(f, buf, strlen(buf));
484 void write_byte(int f,unsigned char c)
486 write_buf(f,(char *)&c,1);
489 int read_line(int f, char *buf, int maxlen)
496 if (buf[0] == 0) return 0;
497 if (buf[0] == '\n') {
501 if (buf[0] != '\r') {
517 void io_printf(int fd, const char *format, ...)
523 va_start(ap, format);
524 len = vslprintf(buf, sizeof(buf), format, ap);
527 if (len < 0) exit_cleanup(RERR_STREAMIO);
533 /* setup for multiplexing an error stream with the data stream */
534 void io_start_multiplex_out(int fd)
536 multiplex_out_fd = fd;
538 io_start_buffering(fd);
539 io_multiplexing_out = 1;
542 /* setup for multiplexing an error stream with the data stream */
543 void io_start_multiplex_in(int fd)
545 multiplex_in_fd = fd;
547 if (read_buffer_len) {
548 fprintf(stderr,"ERROR: data in read buffer at mplx start\n");
549 exit_cleanup(RERR_STREAMIO);
552 io_multiplexing_in = 1;
555 /* write an message to the error stream */
556 int io_multiplex_write(int f, char *buf, int len)
558 if (!io_multiplexing_out) return 0;
562 SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len);
563 memcpy(io_buffer, buf, len);
565 stats.total_written += (len+4);
567 writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4);
571 void io_close_input(int fd)