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/*
* radmin.c RADIUS Administration tool.
*
* Version: $Id$
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Copyright 2015 The FreeRADIUS server project
* Copyright 2015 Alan DeKok <aland@deployingradius.com>
*/
RCSID("$Id$")
#include <freeradius-devel/radiusd.h>
#include <freeradius-devel/channel.h>
typedef struct rchannel_t {
uint32_t channel;
uint32_t length;
} rchannel_t;
static ssize_t lo_read(int fd, void *inbuf, size_t buflen)
{
size_t total;
ssize_t r;
uint8_t *p = inbuf;
for (total = 0; total < buflen; total += r) {
r = read(fd, p + total, buflen - total);
if (r == 0) return 0;
if (r < 0) {
if (errno == EINTR) continue;
return -1;
}
}
return total;
}
/*
* A non-blocking copy of fr_channel_read().
*/
ssize_t fr_channel_drain(int fd, fr_channel_type_t *pchannel, void *inbuf, size_t buflen, uint8_t **outbuf, size_t have_read)
{
ssize_t r;
size_t data_len;
uint8_t *buffer = inbuf;
rchannel_t hdr;
/*
* If we can't even read a header, die.
*/
if (buflen <= sizeof(hdr)) {
errno = EINVAL;
return -1;
}
/*
* Ensure that we read the header first.
*/
if (have_read < sizeof(hdr)) {
*pchannel = FR_CHANNEL_WANT_MORE;
r = lo_read(fd, buffer + have_read, sizeof(hdr) - have_read);
if (r <= 0) return r;
have_read += r;
if (have_read < sizeof(hdr)) return have_read;
}
/*
* We've read the header. Figure out how much more data
* we need to read.
*/
memcpy(&hdr, buffer, sizeof(hdr));
data_len = ntohl(hdr.length);
/*
* The data will overflow the buffer. Die.
*/
if ((sizeof(hdr) + data_len) > buflen) {
errno = EINVAL;
return -1;
}
/*
* This is how much we really want.
*/
buflen = sizeof(hdr) + data_len;
r = lo_read(fd, buffer + have_read, buflen - have_read);
if (r <= 0) return r;
have_read += r;
if (have_read == buflen) {
*pchannel = ntohl(hdr.channel);
*outbuf = buffer + sizeof(hdr);
return data_len;
}
*pchannel = FR_CHANNEL_WANT_MORE;
return have_read;
}
ssize_t fr_channel_read(int fd, fr_channel_type_t *pchannel, void *inbuf, size_t buflen)
{
ssize_t r;
size_t data_len;
uint8_t *buffer = inbuf;
rchannel_t hdr;
/*
* Read the header
*/
r = lo_read(fd, &hdr, sizeof(hdr));
if (r <= 0) return r;
/*
* Read the data into the buffer.
*/
*pchannel = ntohl(hdr.channel);
data_len = ntohl(hdr.length);
#if 0
fprintf(stderr, "CHANNEL R %zu length %zu\n", *pchannel, data_len);
#endif
/*
* Shrink the output buffer to the size of the data we
* have.
*/
if (buflen > data_len) buflen = data_len;
r = lo_read(fd, buffer, buflen);
if (r <= 0) return r;
/*
* Read and discard any extra data sent to us. Sorry,
* caller, you should have used a larger buffer!
*/
while (data_len > buflen) {
size_t discard;
uint8_t junk[64];
discard = data_len - buflen;
if (discard > sizeof(junk)) discard = sizeof(junk);
r = lo_read(fd, junk, discard);
if (r <= 0) break;
data_len -= r;
}
return buflen;
}
static ssize_t lo_write(int fd, void const *inbuf, size_t buflen)
{
size_t total;
ssize_t r;
uint8_t const *buffer = inbuf;
total = buflen;
while (total > 0) {
r = write(fd, buffer, total);
if (r == 0) {
errno = EAGAIN;
return -1;
}
if (r < 0) {
if (errno == EINTR) continue;
return -1;
}
buffer += r;
total -= r;
}
return buflen;
}
ssize_t fr_channel_write(int fd, fr_channel_type_t channel, void const *inbuf, size_t buflen)
{
ssize_t r;
rchannel_t hdr;
uint8_t const *buffer = inbuf;
hdr.channel = htonl(channel);
hdr.length = htonl(buflen);
#if 0
fprintf(stderr, "CHANNEL W %zu length %zu\n", channel, buflen);
#endif
/*
* write the header
*/
r = lo_write(fd, &hdr, sizeof(hdr));
if (r <= 0) return r;
/*
* write the data directly from the buffer
*/
r = lo_write(fd, buffer, buflen);
if (r <= 0) return r;
return buflen;
}
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