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/* Copyright 2011 NORDUnet A/S. All rights reserved.
See the file COPYING for licensing information. */
#if defined HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <event2/event.h>
#include <event2/bufferevent.h>
#if defined (RS_ENABLE_TLS)
#include <event2/bufferevent_ssl.h>
#include <openssl/err.h>
#endif
#include <radius/client.h>
#include <radsec/radsec.h>
#include <radsec/radsec-impl.h>
#include "tcp.h"
#include "packet.h"
#include "conn.h"
#include "debug.h"
#include "event.h"
#if defined (DEBUG)
#include <event2/buffer.h>
#endif
/* Read one RADIUS packet header. Return !0 on error. A return value
of 0 means that we need more data. */
static int
_read_header (struct rs_packet *pkt)
{
size_t n = 0;
n = bufferevent_read (pkt->conn->bev, pkt->hdr, RS_HEADER_LEN);
if (n == RS_HEADER_LEN)
{
pkt->flags |= rs_packet_hdr_read_flag;
pkt->rpkt->length = (pkt->hdr[2] << 8) + pkt->hdr[3];
if (pkt->rpkt->length < 20 || pkt->rpkt->length > RS_MAX_PACKET_LEN)
{
conn_close (&pkt->conn);
return rs_err_conn_push (pkt->conn, RSE_INVALID_PKT,
"invalid packet length: %d",
pkt->rpkt->length);
}
memcpy (pkt->rpkt->data, pkt->hdr, RS_HEADER_LEN);
bufferevent_setwatermark (pkt->conn->bev, EV_READ,
pkt->rpkt->length - RS_HEADER_LEN, 0);
rs_debug (("%s: packet header read, total pkt len=%d\n",
__func__, pkt->rpkt->length));
}
else if (n < 0)
{
rs_debug (("%s: buffer frozen while reading header\n", __func__));
}
else /* Error: libevent gave us less than the low watermark. */
{
conn_close (&pkt->conn);
return rs_err_conn_push_fl (pkt->conn, RSE_INTERNAL, __FILE__, __LINE__,
"got %d octets reading header", n);
}
return 0;
}
static int
_read_packet (struct rs_packet *pkt)
{
size_t n = 0;
int err;
rs_debug (("%s: trying to read %d octets of packet data\n", __func__,
pkt->rpkt->length - RS_HEADER_LEN));
n = bufferevent_read (pkt->conn->bev,
pkt->rpkt->data + RS_HEADER_LEN,
pkt->rpkt->length - RS_HEADER_LEN);
rs_debug (("%s: read %ld octets of packet data\n", __func__, n));
if (n == pkt->rpkt->length - RS_HEADER_LEN)
{
bufferevent_disable (pkt->conn->bev, EV_READ);
rs_debug (("%s: complete packet read\n", __func__));
pkt->flags &= ~rs_packet_hdr_read_flag;
memset (pkt->hdr, 0, sizeof(*pkt->hdr));
/* Checks done by rad_packet_ok:
- lenghts (FIXME: checks really ok for tcp?)
- invalid code field
- attribute lengths >= 2
- attribute sizes adding up correctly */
err = nr_packet_ok (pkt->rpkt);
if (err != RSE_OK)
{
conn_close (&pkt->conn);
return rs_err_conn_push_fl (pkt->conn, err, __FILE__, __LINE__,
"invalid packet");
}
#if defined (DEBUG)
/* Find out what happens if there's data left in the buffer. */
{
size_t rest = 0;
rest = evbuffer_get_length (bufferevent_get_input (pkt->conn->bev));
if (rest)
rs_debug (("%s: returning with %d octets left in buffer\n", __func__,
rest));
}
#endif
/* Hand over message to user. This changes ownership of pkt.
Don't touch it afterwards -- it might have been freed. */
if (pkt->conn->callbacks.received_cb)
pkt->conn->callbacks.received_cb (pkt, pkt->conn->user_data);
}
else if (n < 0) /* Buffer frozen. */
rs_debug (("%s: buffer frozen when reading packet\n", __func__));
else /* Short packet. */
rs_debug (("%s: waiting for another %d octets\n", __func__,
pkt->rpkt->length - RS_HEADER_LEN - n));
return 0;
}
/* The read callback for TCP.
Read exactly one RADIUS message from BEV and store it in struct
rs_packet passed in USER_DATA.
Inform upper layer about successful reception of received RADIUS
message by invoking conn->callbacks.recevied_cb(), if !NULL. */
void
tcp_read_cb (struct bufferevent *bev, void *user_data)
{
struct rs_packet *pkt = (struct rs_packet *) user_data;
assert (pkt);
assert (pkt->conn);
assert (pkt->rpkt);
pkt->rpkt->sockfd = pkt->conn->fd;
pkt->rpkt->vps = NULL;
if ((pkt->flags & rs_packet_hdr_read_flag) == 0)
if (_read_header (pkt))
return; /* Error. */
_read_packet (pkt);
}
void
tcp_event_cb (struct bufferevent *bev, short events, void *user_data)
{
struct rs_packet *pkt = (struct rs_packet *) user_data;
struct rs_connection *conn = NULL;
struct rs_peer *p = NULL;
int sockerr = 0;
#if defined (RS_ENABLE_TLS)
unsigned long tlserr = 0;
#endif
assert (pkt);
assert (pkt->conn);
assert (pkt->conn->active_peer);
conn = pkt->conn;
p = conn->active_peer;
conn->is_connecting = 0;
if (events & BEV_EVENT_CONNECTED)
{
if (conn->tev)
evtimer_del (conn->tev); /* Cancel connect timer. */
event_on_connect (conn, pkt);
}
else if (events & BEV_EVENT_EOF)
{
event_on_disconnect (conn);
}
else if (events & BEV_EVENT_TIMEOUT)
{
rs_debug (("%s: %p times out on %s\n", __func__, p,
(events & BEV_EVENT_READING) ? "read" : "write"));
rs_err_conn_push_fl (pkt->conn, RSE_TIMEOUT_IO, __FILE__, __LINE__, NULL);
}
else if (events & BEV_EVENT_ERROR)
{
sockerr = evutil_socket_geterror (conn->active_peer->fd);
if (sockerr == 0) /* FIXME: True that errno == 0 means closed? */
{
event_on_disconnect (conn);
rs_err_conn_push_fl (pkt->conn, RSE_DISCO, __FILE__, __LINE__, NULL);
}
else
{
rs_debug (("%s: %d: %d (%s)\n", __func__, conn->fd, sockerr,
evutil_socket_error_to_string (sockerr)));
rs_err_conn_push_fl (pkt->conn, RSE_SOCKERR, __FILE__, __LINE__,
"%d: %d (%s)", conn->fd, sockerr,
evutil_socket_error_to_string (sockerr));
}
#if defined (RS_ENABLE_TLS)
if (conn->tls_ssl) /* FIXME: correct check? */
{
for (tlserr = bufferevent_get_openssl_error (conn->bev);
tlserr;
tlserr = bufferevent_get_openssl_error (conn->bev))
{
rs_debug (("%s: openssl error: %s\n", __func__,
ERR_error_string (tlserr, NULL)));
rs_err_conn_push_fl (pkt->conn, RSE_SSLERR, __FILE__, __LINE__,
ERR_error_string (tlserr, NULL));
}
}
#endif /* RS_ENABLE_TLS */
event_loopbreak (conn);
}
#if defined (DEBUG)
if (events & BEV_EVENT_ERROR && events != BEV_EVENT_ERROR)
rs_debug (("%s: BEV_EVENT_ERROR and more: 0x%x\n", __func__, events));
#endif
}
void
tcp_write_cb (struct bufferevent *bev, void *ctx)
{
struct rs_packet *pkt = (struct rs_packet *) ctx;
assert (pkt);
assert (pkt->conn);
if (pkt->conn->callbacks.sent_cb)
pkt->conn->callbacks.sent_cb (pkt->conn->user_data);
}
int
tcp_init_connect_timer (struct rs_connection *conn)
{
assert (conn);
if (conn->tev)
event_free (conn->tev);
conn->tev = evtimer_new (conn->evb, event_conn_timeout_cb, conn);
if (!conn->tev)
return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
"evtimer_new");
return RSE_OK;
}
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