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;
41 static int io_error_fd = -1;
42 static int in_read_check;
44 void setup_readbuffer(int f_in)
49 static void check_timeout(void)
53 if (!io_timeout) return;
62 if (last_io && io_timeout && (t-last_io) >= io_timeout) {
63 rprintf(FERROR,"io timeout after %d second - exiting\n",
65 exit_cleanup(RERR_TIMEOUT);
69 /* setup the fd used to propogate errors */
70 void io_set_error_fd(int fd)
75 /* read some data from the error fd and write it to FERROR */
76 static void read_error_fd(void)
83 n = read(fd, buf, sizeof(buf)-1);
85 rwrite(FERROR, buf, n);
92 static char *read_buffer;
93 static char *read_buffer_p;
94 static int read_buffer_len;
95 static int read_buffer_size;
97 static int no_flush_read;
99 /* read from a socket with IO timeout. return the number of
100 bytes read. If no bytes can be read then exit, never return
102 static int read_timeout(int fd, char *buf, int len)
117 if (io_error_fd != -1) {
118 FD_SET(io_error_fd, &fds);
119 if (io_error_fd > fd) fd_count = io_error_fd+1;
122 tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
127 if (select(fd_count, &fds, NULL, NULL, &tv) < 1) {
128 if (errno == EBADF) {
129 exit_cleanup(RERR_SOCKETIO);
135 if (io_error_fd != -1 && FD_ISSET(io_error_fd, &fds)) {
139 if (!FD_ISSET(fd, &fds)) continue;
141 n = read(fd, buf, len);
148 last_io = time(NULL);
152 if (n == -1 && errno == EINTR) {
159 rprintf(FERROR,"unexpected EOF in read_timeout\n");
161 exit_cleanup(RERR_STREAMIO);
164 /* this prevents us trying to write errors on a dead socket */
165 io_multiplexing_close();
167 rprintf(FERROR,"read error: %s\n", strerror(errno));
168 exit_cleanup(RERR_STREAMIO);
174 /* continue trying to read len bytes - don't return until len
176 static void read_loop(int fd, char *buf, int len)
179 int n = read_timeout(fd, buf, len);
186 /* read from the file descriptor handling multiplexing -
187 return number of bytes read
189 static int read_unbuffered(int fd, char *buf, int len)
191 static int remaining;
196 if (!io_multiplexing_in || fd != multiplex_in_fd)
197 return read_timeout(fd, buf, len);
201 len = MIN(len, remaining);
202 read_loop(fd, buf, len);
208 read_loop(fd, ibuf, 4);
211 remaining = tag & 0xFFFFFF;
214 if (tag == MPLEX_BASE) continue;
218 if (tag != FERROR && tag != FINFO) {
219 rprintf(FERROR,"unexpected tag %d\n", tag);
220 exit_cleanup(RERR_STREAMIO);
223 if (remaining > sizeof(line)-1) {
224 rprintf(FERROR,"multiplexing overflow %d\n\n",
226 exit_cleanup(RERR_STREAMIO);
229 read_loop(fd, line, remaining);
232 rprintf(tag,"%s", line);
235 if (in_read_check) break;
243 /* This function was added to overcome a deadlock problem when using
244 * ssh. It looks like we can't allow our receive queue to get full or
245 * ssh will clag up. Uggh. */
246 static void read_check(int f)
254 if (read_buffer_len == 0) {
255 read_buffer_p = read_buffer;
258 if (n > MAX_READ_BUFFER/4)
259 n = MAX_READ_BUFFER/4;
261 if (read_buffer_p != read_buffer) {
262 memmove(read_buffer,read_buffer_p,read_buffer_len);
263 read_buffer_p = read_buffer;
266 if (n > (read_buffer_size - read_buffer_len)) {
267 read_buffer_size += n;
268 read_buffer = (char *)Realloc(read_buffer,read_buffer_size);
269 if (!read_buffer) out_of_memory("read check");
270 read_buffer_p = read_buffer;
273 n = read_unbuffered(f,read_buffer+read_buffer_len,n);
274 read_buffer_len += n;
280 /* do a buffered read from fd. don't return until all N bytes
281 have been read. If all N can't be read then exit with an error */
282 static void readfd(int fd,char *buffer,int N)
287 if ((read_buffer_len < N) && (N < 1024)) {
288 read_check(buffer_f_in);
292 if (read_buffer_len > 0 && buffer_f_in == fd) {
293 ret = MIN(read_buffer_len,N-total);
294 memcpy(buffer+total,read_buffer_p,ret);
295 read_buffer_p += ret;
296 read_buffer_len -= ret;
305 ret = read_unbuffered(fd,buffer + total,N-total);
309 stats.total_read += total;
313 int32 read_int(int f)
320 if (ret == (int32)0xffffffff) return -1;
324 int64 read_longint(int f)
326 extern int remote_version;
331 if ((int32)ret != (int32)0xffffffff) {
336 rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
337 exit_cleanup(RERR_UNSUPPORTED);
339 if (remote_version >= 16) {
341 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
348 void read_buf(int f,char *buf,int len)
353 void read_sbuf(int f,char *buf,int len)
359 unsigned char read_byte(int f)
362 read_buf(f,(char *)&c,1);
368 /* write len bytes to fd, possibly reading from buffer_f_in if set
369 in order to unclog the pipe. don't return until all len
370 bytes have been written */
371 static void writefd_unbuffered(int fd,char *buf,int len)
381 while (total < len) {
387 if (!no_flush_read) {
388 reading = (buffer_f_in != -1);
392 FD_SET(buffer_f_in,&r_fds);
393 if (buffer_f_in > fd_count)
394 fd_count = buffer_f_in;
397 if (io_error_fd != -1) {
398 FD_SET(io_error_fd,&r_fds);
399 if (io_error_fd > fd_count)
400 fd_count = io_error_fd;
403 tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
408 count = select(fd_count+1,
409 (reading || io_error_fd != -1)?&r_fds:NULL,
414 if (errno == EBADF) {
415 exit_cleanup(RERR_SOCKETIO);
421 if (reading && FD_ISSET(buffer_f_in, &r_fds)) {
422 read_check(buffer_f_in);
425 if (io_error_fd != -1 && FD_ISSET(io_error_fd, &r_fds)) {
429 if (FD_ISSET(fd, &w_fds)) {
430 int ret, n = len-total;
432 if (n > PIPE_BUF) n = PIPE_BUF;
434 ret = write(fd,buf+total,n?n:1);
436 if (ret == -1 && errno == EINTR) {
441 rprintf(FERROR,"erroring writing %d bytes - exiting\n", len);
442 exit_cleanup(RERR_STREAMIO);
448 last_io = time(NULL);
456 static char *io_buffer;
457 static int io_buffer_count;
459 void io_start_buffering(int fd)
461 if (io_buffer) return;
462 multiplex_out_fd = fd;
463 io_buffer = (char *)malloc(IO_BUFFER_SIZE+4);
464 if (!io_buffer) out_of_memory("writefd");
467 /* leave room for the multiplex header in case it's needed */
473 int fd = multiplex_out_fd;
474 if (!io_buffer_count || no_flush) return;
476 if (io_multiplexing_out) {
477 SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count);
478 writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4);
480 writefd_unbuffered(fd, io_buffer, io_buffer_count);
485 void io_end_buffering(int fd)
488 if (!io_multiplexing_out) {
494 static void writefd(int fd,char *buf,int len)
496 stats.total_written += len;
498 if (!io_buffer || fd != multiplex_out_fd) {
499 writefd_unbuffered(fd, buf, len);
504 int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count);
506 memcpy(io_buffer+io_buffer_count, buf, n);
509 io_buffer_count += n;
512 if (io_buffer_count == IO_BUFFER_SIZE) io_flush();
517 void write_int(int f,int32 x)
524 void write_longint(int f, int64 x)
526 extern int remote_version;
529 if (remote_version < 16 || x <= 0x7FFFFFFF) {
530 write_int(f, (int)x);
534 write_int(f, (int32)0xFFFFFFFF);
535 SIVAL(b,0,(x&0xFFFFFFFF));
536 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
541 void write_buf(int f,char *buf,int len)
546 /* write a string to the connection */
547 static void write_sbuf(int f,char *buf)
549 write_buf(f, buf, strlen(buf));
553 void write_byte(int f,unsigned char c)
555 write_buf(f,(char *)&c,1);
558 int read_line(int f, char *buf, int maxlen)
565 if (buf[0] == 0) return 0;
566 if (buf[0] == '\n') {
570 if (buf[0] != '\r') {
586 void io_printf(int fd, const char *format, ...)
592 va_start(ap, format);
593 len = vslprintf(buf, sizeof(buf), format, ap);
596 if (len < 0) exit_cleanup(RERR_STREAMIO);
602 /* setup for multiplexing an error stream with the data stream */
603 void io_start_multiplex_out(int fd)
605 multiplex_out_fd = fd;
607 io_start_buffering(fd);
608 io_multiplexing_out = 1;
611 /* setup for multiplexing an error stream with the data stream */
612 void io_start_multiplex_in(int fd)
614 multiplex_in_fd = fd;
616 if (read_buffer_len) {
617 fprintf(stderr,"ERROR: data in read buffer at mplx start\n");
618 exit_cleanup(RERR_STREAMIO);
621 io_multiplexing_in = 1;
624 /* write an message to the multiplexed error stream */
625 int io_multiplex_write(int f, char *buf, int len)
627 if (!io_multiplexing_out) return 0;
631 SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len);
632 memcpy(io_buffer, buf, len);
634 stats.total_written += (len+4);
636 writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4);
640 /* write a message to the special error fd */
641 int io_error_write(int f, char *buf, int len)
643 if (f == -1) return 0;
644 writefd_unbuffered(f, buf, len);
648 /* stop output multiplexing */
649 void io_multiplexing_close(void)
651 io_multiplexing_out = 0;
654 void io_close_input(int fd)