--- /dev/null
+/* Copyright 2011-2013 NORDUnet A/S. All rights reserved.
+ See LICENSE 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. */
+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_HEADER_READ;
+ pkt->rpkt->length = (pkt->hdr[2] << 8) + pkt->hdr[3];
+ if (pkt->rpkt->length < 20 || pkt->rpkt->length > RS_MAX_PACKET_LEN)
+ {
+ rs_debug (("%s: invalid packet length: %d\n",
+ __func__, pkt->rpkt->length));
+ rs_conn_disconnect (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. */
+ {
+ rs_debug (("%s: got: %d octets reading header\n", __func__, n));
+ rs_conn_disconnect (pkt->conn);
+ return rs_err_conn_push_fl (pkt->conn, RSE_INTERNAL, __FILE__, __LINE__,
+ "got %d octets reading header", n);
+ }
+
+ return 0;
+}
+
+/** Read a message, check that it's valid RADIUS and hand it off to
+ registered user callback.
+
+ The packet is read from the bufferevent associated with \a pkt and
+ the data is stored in \a pkt->rpkt.
+
+ Return 0 on success and !0 on failure. */
+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_HEADER_READ;
+ 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)
+ {
+ rs_debug (("%s: %d: invalid packet\n", __func__, -err));
+ rs_conn_disconnect (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; /* FIXME: can this be done when initializing pkt? */
+
+ /* Read a message header if not already read, return if that
+ fails. Read a message and have it dispatched to the user
+ registered callback.
+
+ Room for improvement: Peek inside buffer (evbuffer_copyout()) to
+ avoid the extra copying. */
+ if ((pkt->flags & RS_PACKET_HEADER_READ) == 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;
+ int sockerr = 0;
+#if defined (RS_ENABLE_TLS)
+ unsigned long tlserr = 0;
+#endif
+#if defined (DEBUG)
+ struct rs_peer *p = NULL;
+#endif
+
+ assert (pkt);
+ assert (pkt->conn);
+ conn = pkt->conn;
+#if defined (DEBUG)
+ assert (pkt->conn->active_peer);
+ p = conn->active_peer;
+#endif
+
+ conn->is_connecting = 0;
+ if (events & BEV_EVENT_CONNECTED)
+ {
+ if (conn->tev)
+ evtimer_del (conn->tev); /* Cancel connect timer. */
+ if (event_on_connect (conn, pkt))
+ {
+ event_on_disconnect (conn);
+ event_loopbreak (conn);
+ }
+ }
+ 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 (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 (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 (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 (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;
+}
projects / radsecproxy.git / blobdiff