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/* copy.c - twoftpd network copy routine
* Copyright (C) 2008 Bruce Guenter <bruce@untroubled.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sysdeps.h>
#include <errno.h>
#include <unistd.h>
#include <net/socket.h>
#include "backend.h"
static int error_code(int err)
{
return (err == EPIPE
|| err == ECONNRESET)
? 2
: -1;
}
/* Return value:
* 0 if the iobuf was ready
* 1 for timeout
* 2 for an interrupt
*/
static int pollit(int fd, int events, int timeout)
{
iopoll_fd pfd[2];
pfd[0].fd = 0;
pfd[0].events = IOPOLL_READ;
pfd[0].revents = 0;
pfd[1].fd = fd;
pfd[1].events = events;
pfd[1].revents = 0;
switch (iopoll_restart(pfd, 2, timeout)) {
case -1:
return -1;
case 0:
return 1;
default:
if (pfd[0].revents)
return 2;
return 0;
}
}
/* Return values for following routines:
* -1 for a system error
* 0 for a successful transfer
* 1 for timeout
* 2 for interrupted transfer
*/
int netwrite(int out, const char* optr, unsigned long ocount, int timeout)
{
int result;
ssize_t wr;
while (ocount > 0) {
if ((result = pollit(out, IOPOLL_WRITE, timeout)) != 0)
return result;
if ((wr = write(out, optr, ocount)) == -1)
return error_code(errno);
if (wr == 0) {
errno = EIO;
return -1;
}
ocount -= wr;
optr += wr;
}
return 0;
}
static int copy_xlate(int in, int out, int timeout,
unsigned long (*xlate)(char* out,
const char* in,
unsigned long inlen),
unsigned long* bytes_in,
unsigned long* bytes_out)
{
char in_buf[iobuf_bufsize];
char out_buf[sizeof in_buf * 2];
char* optr;
ssize_t icount;
ssize_t ocount;
int result;
*bytes_in = 0;
*bytes_out = 0;
for (;;) {
if ((result = pollit(in, IOPOLL_READ, timeout)) != 0)
return result;
if ((icount = read(in, in_buf, sizeof in_buf)) == -1)
return -1;
if (icount == 0)
return 0;
*bytes_in += icount;
if (xlate) {
optr = out_buf;
ocount = xlate(out_buf, in_buf, icount);
}
else {
optr = in_buf;
ocount = icount;
}
if ((result = netwrite(out, optr, ocount, timeout)) != 0)
return result;
*bytes_out += ocount;
}
return 0;
}
int copy_xlate_close(int in, int out, int timeout,
unsigned long (*xlate)(char*, const char*, unsigned long),
unsigned long* bytes_in,
unsigned long* bytes_out)
{
int status;
status = copy_xlate(in, out, timeout, xlate, bytes_in, bytes_out);
/* Three possible cases here: in is at EOF, an error occurred while
* reading in, or writing is completed. In all cases we can ignore
* errors during closing in. */
close(in);
/* The output might be a socket that needs to be uncorked. If the
* output is a file, this is harmless. */
socket_uncork(out);
if (close(out) != 0)
if (status == 0)
status = error_code(out);
return status;
}
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