read.c
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/**
* \file
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2012 Georg Hopp
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <unistd.h>
#include <errno.h>
#include "tr/stream.h"
#include "tr/logger.h"
extern TR_Logger logger;
ssize_t
TR_streamRead(TR_Stream this, void * buf, size_t count)
{
ssize_t done;
switch(this->type) {
ssize_t _read;
case TR_STREAM_FD:
_read = read((this->handle).fd, buf, count);
if (_read < 0) {
switch (errno) {
case EINTR:
case ENOMEM:
done = 0;
break;
case (EAGAIN|EWOULDBLOCK):
done = -1;
break;
default:
done = -2;
break;
}
} else if (_read == 0) {
done = -2;
} else {
done = _read;
}
break;
case TR_STREAM_SSL:
done = SSL_read((this->handle).ssl, buf, count);
if (0 == done) {
done = -2;
} else if (0 > done) {
switch (SSL_get_error((this->handle).ssl, done)) {
case SSL_ERROR_SYSCALL:
{
switch (errno) {
case EINTR:
case ENOBUFS:
case ENOMEM:
done = 0;
break;
case (EAGAIN|EWOULDBLOCK):
done = -1;
break;
default:
done = -1;
break;
}
}
break;
case SSL_ERROR_SSL:
{
unsigned long err;
while (0 != (err = ERR_get_error())) {
TR_loggerLog(
logger,
TR_LOGGER_DEBUG,
ERR_error_string(err, NULL));
}
}
// DROP THROUGH
case SSL_ERROR_ZERO_RETURN:
done = -2;
break;
}
}
break;
default:
done = -2;
break;
}
return done;
}
// vim: set ts=4 sw=4: