1 /* Copyright 2011 NORDUnet A/S. All rights reserved.
2 See the file COPYING for licensing information. */
4 #if defined HAVE_CONFIG_H
9 #include <event2/event.h>
10 #include <event2/bufferevent.h>
11 #if defined (RS_ENABLE_TLS)
12 #include <event2/bufferevent_ssl.h>
13 #include <openssl/err.h>
15 #include <radius/client.h>
16 #include <radsec/radsec.h>
17 #include <radsec/radsec-impl.h>
25 #include <event2/buffer.h>
28 /* Read one RADIUS packet header. Return !0 on error. A return value
29 of 0 means that we need more data. */
31 _read_header (struct rs_packet *pkt)
35 n = bufferevent_read (pkt->conn->bev, pkt->hdr, RS_HEADER_LEN);
36 if (n == RS_HEADER_LEN)
38 pkt->flags |= rs_packet_hdr_read_flag;
39 pkt->rpkt->length = (pkt->hdr[2] << 8) + pkt->hdr[3];
40 if (pkt->rpkt->length < 20 || pkt->rpkt->length > RS_MAX_PACKET_LEN)
42 conn_close (&pkt->conn);
43 return rs_err_conn_push (pkt->conn, RSE_INVALID_PKT,
44 "invalid packet length: %d",
47 memcpy (pkt->rpkt->data, pkt->hdr, RS_HEADER_LEN);
48 bufferevent_setwatermark (pkt->conn->bev, EV_READ,
49 pkt->rpkt->length - RS_HEADER_LEN, 0);
50 rs_debug (("%s: packet header read, total pkt len=%d\n",
51 __func__, pkt->rpkt->length));
55 rs_debug (("%s: buffer frozen while reading header\n", __func__));
57 else /* Error: libevent gave us less than the low watermark. */
59 conn_close (&pkt->conn);
60 return rs_err_conn_push_fl (pkt->conn, RSE_INTERNAL, __FILE__, __LINE__,
61 "got %d octets reading header", n);
68 _read_packet (struct rs_packet *pkt)
73 rs_debug (("%s: trying to read %d octets of packet data\n", __func__,
74 pkt->rpkt->length - RS_HEADER_LEN));
76 n = bufferevent_read (pkt->conn->bev,
77 pkt->rpkt->data + RS_HEADER_LEN,
78 pkt->rpkt->length - RS_HEADER_LEN);
80 rs_debug (("%s: read %ld octets of packet data\n", __func__, n));
82 if (n == pkt->rpkt->length - RS_HEADER_LEN)
84 bufferevent_disable (pkt->conn->bev, EV_READ);
85 rs_debug (("%s: complete packet read\n", __func__));
86 pkt->flags &= ~rs_packet_hdr_read_flag;
87 memset (pkt->hdr, 0, sizeof(*pkt->hdr));
89 /* Checks done by rad_packet_ok:
90 - lenghts (FIXME: checks really ok for tcp?)
92 - attribute lengths >= 2
93 - attribute sizes adding up correctly */
94 err = nr_packet_ok (pkt->rpkt);
97 conn_close (&pkt->conn);
98 return rs_err_conn_push_fl (pkt->conn, err, __FILE__, __LINE__,
103 /* Find out what happens if there's data left in the buffer. */
106 rest = evbuffer_get_length (bufferevent_get_input (pkt->conn->bev));
108 rs_debug (("%s: returning with %d octets left in buffer\n", __func__,
113 /* Hand over message to user. This changes ownership of pkt.
114 Don't touch it afterwards -- it might have been freed. */
115 if (pkt->conn->callbacks.received_cb)
116 pkt->conn->callbacks.received_cb (pkt, pkt->conn->user_data);
118 else if (n < 0) /* Buffer frozen. */
119 rs_debug (("%s: buffer frozen when reading packet\n", __func__));
120 else /* Short packet. */
121 rs_debug (("%s: waiting for another %d octets\n", __func__,
122 pkt->rpkt->length - RS_HEADER_LEN - n));
127 /* The read callback for TCP.
129 Read exactly one RADIUS message from BEV and store it in struct
130 rs_packet passed in USER_DATA.
132 Inform upper layer about successful reception of received RADIUS
133 message by invoking conn->callbacks.recevied_cb(), if !NULL. */
135 tcp_read_cb (struct bufferevent *bev, void *user_data)
137 struct rs_packet *pkt = (struct rs_packet *) user_data;
143 pkt->rpkt->sockfd = pkt->conn->fd;
144 pkt->rpkt->vps = NULL;
146 if ((pkt->flags & rs_packet_hdr_read_flag) == 0)
147 if (_read_header (pkt))
153 tcp_event_cb (struct bufferevent *bev, short events, void *user_data)
155 struct rs_packet *pkt = (struct rs_packet *) user_data;
156 struct rs_connection *conn = NULL;
158 #if defined (RS_ENABLE_TLS)
159 unsigned long tlserr = 0;
164 assert (pkt->conn->active_peer);
167 conn->is_connecting = 0;
168 if (events & BEV_EVENT_CONNECTED)
171 evtimer_del (conn->tev); /* Cancel connect timer. */
172 event_on_connect (conn, pkt);
174 else if (events & BEV_EVENT_EOF)
176 event_on_disconnect (conn);
178 else if (events & BEV_EVENT_TIMEOUT)
180 rs_debug (("%s: %p times out on %s\n", __func__, p,
181 (events & BEV_EVENT_READING) ? "read" : "write"));
182 rs_err_conn_push_fl (pkt->conn, RSE_TIMEOUT_IO, __FILE__, __LINE__, NULL);
184 else if (events & BEV_EVENT_ERROR)
186 sockerr = evutil_socket_geterror (conn->active_peer->fd);
187 if (sockerr == 0) /* FIXME: True that errno == 0 means closed? */
189 event_on_disconnect (conn);
190 rs_err_conn_push_fl (pkt->conn, RSE_DISCO, __FILE__, __LINE__, NULL);
194 rs_debug (("%s: %d: %d (%s)\n", __func__, conn->fd, sockerr,
195 evutil_socket_error_to_string (sockerr)));
196 rs_err_conn_push_fl (pkt->conn, RSE_SOCKERR, __FILE__, __LINE__,
197 "%d: %d (%s)", conn->fd, sockerr,
198 evutil_socket_error_to_string (sockerr));
200 #if defined (RS_ENABLE_TLS)
201 if (conn->tls_ssl) /* FIXME: correct check? */
203 for (tlserr = bufferevent_get_openssl_error (conn->bev);
205 tlserr = bufferevent_get_openssl_error (conn->bev))
207 rs_debug (("%s: openssl error: %s\n", __func__,
208 ERR_error_string (tlserr, NULL)));
209 rs_err_conn_push_fl (pkt->conn, RSE_SSLERR, __FILE__, __LINE__,
210 ERR_error_string (tlserr, NULL));
213 #endif /* RS_ENABLE_TLS */
214 event_loopbreak (conn);
218 if (events & BEV_EVENT_ERROR && events != BEV_EVENT_ERROR)
219 rs_debug (("%s: BEV_EVENT_ERROR and more: 0x%x\n", __func__, events));
224 tcp_write_cb (struct bufferevent *bev, void *ctx)
226 struct rs_packet *pkt = (struct rs_packet *) ctx;
231 if (pkt->conn->callbacks.sent_cb)
232 pkt->conn->callbacks.sent_cb (pkt->conn->user_data);
236 tcp_init_connect_timer (struct rs_connection *conn)
241 event_free (conn->tev);
242 conn->tev = evtimer_new (conn->evb, event_conn_timeout_cb, conn);
244 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,