1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* tcp.c TCP-specific functions.
*
* 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 (C) 2009 Dante http://dante.net
*/
RCSID("$Id$")
#include <freeradius-devel/libradius.h>
#ifdef WITH_TCP
RADIUS_PACKET *fr_tcp_recv(int sockfd, int flags)
{
RADIUS_PACKET *packet = rad_alloc(NULL, false);
if (!packet) return NULL;
packet->sockfd = sockfd;
if (fr_tcp_read_packet(packet, flags) != 1) {
rad_free(&packet);
return NULL;
}
return packet;
}
/*
* Receives a packet, assuming that the RADIUS_PACKET structure
* has been filled out already.
*
* This ASSUMES that the packet is allocated && fields
* initialized.
*
* This ASSUMES that the socket is marked as O_NONBLOCK, which
* the function above does set, if your system supports it.
*
* Calling this function MAY change sockfd,
* if src_ipaddr.af == AF_UNSPEC.
*/
int fr_tcp_read_packet(RADIUS_PACKET *packet, int flags)
{
ssize_t len;
/*
* No data allocated. Read the 4-byte header into
* a temporary buffer.
*/
if (!packet->data) {
int packet_len;
len = recv(packet->sockfd, packet->vector + packet->data_len,
4 - packet->data_len, 0);
if (len == 0) return -2; /* clean close */
#ifdef ECONNRESET
if ((len < 0) && (errno == ECONNRESET)) { /* forced */
return -2;
}
#endif
if (len < 0) {
fr_strerror_printf("Error receiving packet: %s",
fr_syserror(errno));
return -1;
}
packet->data_len += len;
if (packet->data_len < 4) { /* want more data */
return 0;
}
packet_len = (packet->vector[2] << 8) | packet->vector[3];
if (packet_len < RADIUS_HDR_LEN) {
fr_strerror_printf("Discarding packet: Smaller than RFC minimum of 20 bytes");
return -1;
}
/*
* If the packet is too big, then the socket is bad.
*/
if (packet_len > MAX_PACKET_LEN) {
fr_strerror_printf("Discarding packet: Larger than RFC limitation of 4096 bytes");
return -1;
}
packet->data = talloc_array(packet, uint8_t, packet_len);
if (!packet->data) {
fr_strerror_printf("Out of memory");
return -1;
}
packet->data_len = packet_len;
packet->partial = 4;
memcpy(packet->data, packet->vector, 4);
}
/*
* Try to read more data.
*/
len = recv(packet->sockfd, packet->data + packet->partial,
packet->data_len - packet->partial, 0);
if (len == 0) return -2; /* clean close */
#ifdef ECONNRESET
if ((len < 0) && (errno == ECONNRESET)) { /* forced */
return -2;
}
#endif
if (len < 0) {
fr_strerror_printf("Error receiving packet: %s", fr_syserror(errno));
return -1;
}
packet->partial += len;
if (packet->partial < packet->data_len) {
return 0;
}
/*
* See if it's a well-formed RADIUS packet.
*/
if (!rad_packet_ok(packet, flags, NULL)) {
return -1;
}
/*
* Explicitly set the VP list to empty.
*/
packet->vps = NULL;
if (fr_debug_lvl) {
char ip_buf[128], buffer[256];
if (packet->src_ipaddr.af != AF_UNSPEC) {
inet_ntop(packet->src_ipaddr.af,
&packet->src_ipaddr.ipaddr,
ip_buf, sizeof(ip_buf));
snprintf(buffer, sizeof(buffer), "host %s port %d",
ip_buf, packet->src_port);
} else {
snprintf(buffer, sizeof(buffer), "socket %d",
packet->sockfd);
}
}
return 1; /* done reading the packet */
}
#endif /* WITH_TCP */
|
