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 <radsec/radsec.h>
16 #include <radsec/radsec-impl.h>
24 #include <event2/buffer.h>
27 /* Read one RADIUS packet header. Return !0 on error. A return value
28 of 0 means that we need more data. */
30 _read_header (struct rs_packet *pkt)
34 n = bufferevent_read (pkt->conn->bev, pkt->hdr, RS_HEADER_LEN);
35 if (n == RS_HEADER_LEN)
37 pkt->flags |= rs_packet_hdr_read_flag;
38 pkt->rpkt->data_len = (pkt->hdr[2] << 8) + pkt->hdr[3];
39 if (pkt->rpkt->data_len < 20 || pkt->rpkt->data_len > 4096)
41 conn_close (&pkt->conn);
42 return rs_err_conn_push (pkt->conn, RSE_INVALID_PKT,
43 "invalid packet length: %d",
46 pkt->rpkt->data = rs_malloc (pkt->conn->ctx, pkt->rpkt->data_len);
49 conn_close (&pkt->conn);
50 return rs_err_conn_push_fl (pkt->conn, RSE_NOMEM, __FILE__, __LINE__,
53 memcpy (pkt->rpkt->data, pkt->hdr, RS_HEADER_LEN);
54 bufferevent_setwatermark (pkt->conn->bev, EV_READ,
55 pkt->rpkt->data_len - RS_HEADER_LEN, 0);
56 rs_debug (("%s: packet header read, total pkt len=%d\n",
57 __func__, pkt->rpkt->data_len));
61 rs_debug (("%s: buffer frozen while reading header\n", __func__));
63 else /* Error: libevent gave us less than the low watermark. */
65 conn_close (&pkt->conn);
66 return rs_err_conn_push_fl (pkt->conn, RSE_INTERNAL, __FILE__, __LINE__,
67 "got %d octets reading header", n);
74 _read_packet (struct rs_packet *pkt)
78 rs_debug (("%s: trying to read %d octets of packet data\n", __func__,
79 pkt->rpkt->data_len - RS_HEADER_LEN));
81 n = bufferevent_read (pkt->conn->bev,
82 pkt->rpkt->data + RS_HEADER_LEN,
83 pkt->rpkt->data_len - RS_HEADER_LEN);
85 rs_debug (("%s: read %ld octets of packet data\n", __func__, n));
87 if (n == pkt->rpkt->data_len - RS_HEADER_LEN)
89 bufferevent_disable (pkt->conn->bev, EV_READ);
90 rs_debug (("%s: complete packet read\n", __func__));
91 pkt->flags &= ~rs_packet_hdr_read_flag;
92 memset (pkt->hdr, 0, sizeof(*pkt->hdr));
94 /* Checks done by rad_packet_ok:
95 - lenghts (FIXME: checks really ok for tcp?)
97 - attribute lengths >= 2
98 - attribute sizes adding up correctly */
99 if (!rad_packet_ok (pkt->rpkt, 0))
101 conn_close (&pkt->conn);
102 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
103 "invalid packet: %s", fr_strerror ());
107 /* Find out what happens if there's data left in the buffer. */
110 rest = evbuffer_get_length (bufferevent_get_input (pkt->conn->bev));
112 rs_debug (("%s: returning with %d octets left in buffer\n", __func__,
117 /* Hand over message to user. This changes ownership of pkt.
118 Don't touch it afterwards -- it might have been freed. */
119 if (pkt->conn->callbacks.received_cb)
120 pkt->conn->callbacks.received_cb (pkt, pkt->conn->user_data);
122 else if (n < 0) /* Buffer frozen. */
123 rs_debug (("%s: buffer frozen when reading packet\n", __func__));
124 else /* Short packet. */
125 rs_debug (("%s: waiting for another %d octets\n", __func__,
126 pkt->rpkt->data_len - RS_HEADER_LEN - n));
131 /* The read callback for TCP.
133 Read exactly one RADIUS message from BEV and store it in struct
134 rs_packet passed in USER_DATA.
136 Inform upper layer about successful reception of received RADIUS
137 message by invoking conn->callbacks.recevied_cb(), if !NULL. */
139 tcp_read_cb (struct bufferevent *bev, void *user_data)
141 struct rs_packet *pkt = (struct rs_packet *) user_data;
147 pkt->rpkt->sockfd = pkt->conn->fd;
148 pkt->rpkt->vps = NULL;
150 if ((pkt->flags & rs_packet_hdr_read_flag) == 0)
151 if (_read_header (pkt))
157 tcp_event_cb (struct bufferevent *bev, short events, void *user_data)
159 struct rs_packet *pkt = (struct rs_packet *) user_data;
160 struct rs_connection *conn = NULL;
161 struct rs_peer *p = NULL;
163 #if defined (RS_ENABLE_TLS)
164 unsigned long tlserr = 0;
169 assert (pkt->conn->active_peer);
171 p = conn->active_peer;
173 conn->is_connecting = 0;
174 if (events & BEV_EVENT_CONNECTED)
177 evtimer_del (conn->tev); /* Cancel connect timer. */
178 event_on_connect (conn, pkt);
180 else if (events & BEV_EVENT_EOF)
182 event_on_disconnect (conn);
184 else if (events & BEV_EVENT_TIMEOUT)
186 rs_debug (("%s: %p times out on %s\n", __func__, p,
187 (events & BEV_EVENT_READING) ? "read" : "write"));
188 rs_err_conn_push_fl (pkt->conn, RSE_TIMEOUT_IO, __FILE__, __LINE__, NULL);
190 else if (events & BEV_EVENT_ERROR)
192 sockerr = evutil_socket_geterror (conn->active_peer->fd);
193 if (sockerr == 0) /* FIXME: True that errno == 0 means closed? */
195 event_on_disconnect (conn);
196 rs_err_conn_push_fl (pkt->conn, RSE_DISCO, __FILE__, __LINE__, NULL);
200 rs_debug (("%s: %d: %d (%s)\n", __func__, conn->fd, sockerr,
201 evutil_socket_error_to_string (sockerr)));
202 rs_err_conn_push_fl (pkt->conn, RSE_SOCKERR, __FILE__, __LINE__,
203 "%d: %d (%s)", conn->fd, sockerr,
204 evutil_socket_error_to_string (sockerr));
206 #if defined (RS_ENABLE_TLS)
207 if (conn->tls_ssl) /* FIXME: correct check? */
209 for (tlserr = bufferevent_get_openssl_error (conn->bev);
211 tlserr = bufferevent_get_openssl_error (conn->bev))
213 rs_debug (("%s: openssl error: %s\n", __func__,
214 ERR_error_string (tlserr, NULL)));
215 rs_err_conn_push_fl (pkt->conn, RSE_SSLERR, __FILE__, __LINE__,
216 ERR_error_string (tlserr, NULL));
219 #endif /* RS_ENABLE_TLS */
220 event_loopbreak (conn);
224 if (events & BEV_EVENT_ERROR && events != BEV_EVENT_ERROR)
225 rs_debug (("%s: BEV_EVENT_ERROR and more: 0x%x\n", __func__, events));
230 tcp_write_cb (struct bufferevent *bev, void *ctx)
232 struct rs_packet *pkt = (struct rs_packet *) ctx;
237 if (pkt->conn->callbacks.sent_cb)
238 pkt->conn->callbacks.sent_cb (pkt->conn->user_data);
242 tcp_init_connect_timer (struct rs_connection *conn)
247 event_free (conn->tev);
248 conn->tev = evtimer_new (conn->evb, event_conn_timeout_cb, conn);
250 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,