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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* Copyright (C) 2006-2008 Stig Venaas <venaas@uninett.no>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
/* Code contributions from:
*
* Stefan Winter <stefan.winter@restena.lu>
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/select.h>
#include <stdarg.h>
#include "debug.h"
#include "util.h"
char *stringcopy(const char *s, int len) {
char *r;
if (!s)
return NULL;
if (!len)
len = strlen(s);
r = malloc(len + 1);
if (!r)
debug(DBG_ERR, "stringcopy: malloc failed");
else {
memcpy(r, s, len);
r[len] = '\0';
}
return r;
}
void printfchars(char *prefixfmt, char *prefix, char *charfmt, char *chars, int len) {
int i;
unsigned char *s = (unsigned char *)chars;
if (prefix)
printf(prefixfmt ? prefixfmt : "%s: ", prefix);
for (i = 0; i < len; i++)
printf(charfmt ? charfmt : "%c", s[i]);
printf("\n");
}
void port_set(struct sockaddr *sa, uint16_t port) {
switch (sa->sa_family) {
case AF_INET:
((struct sockaddr_in *)sa)->sin_port = htons(port);
break;
case AF_INET6:
((struct sockaddr_in6 *)sa)->sin6_port = htons(port);
break;
}
}
struct sockaddr *addr_copy(struct sockaddr *in) {
struct sockaddr *out = NULL;
switch (in->sa_family) {
case AF_INET:
out = malloc(sizeof(struct sockaddr_in));
if (out == NULL)
return NULL;
memset(out, 0, sizeof(struct sockaddr_in));
((struct sockaddr_in *)out)->sin_addr = ((struct sockaddr_in *)in)->sin_addr;
break;
case AF_INET6:
out = malloc(sizeof(struct sockaddr_in6));
if (out == NULL)
return NULL;
memset(out, 0, sizeof(struct sockaddr_in6));
((struct sockaddr_in6 *)out)->sin6_addr = ((struct sockaddr_in6 *)in)->sin6_addr;
break;
}
out->sa_family = in->sa_family;
#ifdef SIN6_LEN
out->sa_len = in->sa_len;
#endif
return out;
}
char *addr2string(struct sockaddr *addr) {
struct sockaddr_in6 *sa6;
struct sockaddr_in sa4;
static char addr_buf[2][INET6_ADDRSTRLEN];
static int i = 0;
i = !i;
if (addr->sa_family == AF_INET6) {
sa6 = (struct sockaddr_in6 *)addr;
if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
memset(&sa4, 0, sizeof(sa4));
sa4.sin_family = AF_INET;
sa4.sin_port = sa6->sin6_port;
memcpy(&sa4.sin_addr, &sa6->sin6_addr.s6_addr[12], 4);
addr = (struct sockaddr *)&sa4;
}
}
if (getnameinfo(addr, SOCKADDRP_SIZE(addr), addr_buf[i], sizeof(addr_buf[i]),
NULL, 0, NI_NUMERICHOST)) {
debug(DBG_WARN, "getnameinfo failed");
return "getnameinfo_failed";
}
return addr_buf[i];
}
/* Disable the "Don't Fragment" bit for UDP sockets. It is set by default, which may cause an "oversized"
RADIUS packet to be discarded on first attempt (due to Path MTU discovery).
*/
void disable_DF_bit(int socket, struct addrinfo *res) {
if ((res->ai_family == AF_INET) && (res->ai_socktype == SOCK_DGRAM)) {
#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
/*
* Turn off Path MTU discovery on IPv4/UDP sockets, Linux variant.
*/
int r, action;
debug(DBG_INFO, "disable_DF_bit: disabling DF bit (Linux variant)");
action = IP_PMTUDISC_DONT;
r = setsockopt(socket, IPPROTO_IP, IP_MTU_DISCOVER, &action, sizeof(action));
if (r == -1)
debug(DBG_WARN, "Failed to set IP_MTU_DISCOVER");
#else
debug(DBG_INFO, "Non-Linux platform, unable to unset DF bit for UDP. You should check with tcpdump whether radsecproxy will send its UDP packets with DF bit set!");
#endif
}
}
int bindtoaddr(struct addrinfo *addrinfo, int family, int reuse, int v6only) {
int s, on = 1;
struct addrinfo *res;
for (res = addrinfo; res; res = res->ai_next) {
if (family != AF_UNSPEC && family != res->ai_family)
continue;
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s < 0) {
debug(DBG_WARN, "bindtoaddr: socket failed");
continue;
}
disable_DF_bit(s,res);
if (reuse)
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
debugerrno(errno, DBG_WARN, "Failed to set SO_REUSEADDR");
#ifdef IPV6_V6ONLY
if (v6only)
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1)
debugerrno(errno, DBG_INFO, "Failed to set IPV6_V6ONLY");
#endif
if (!bind(s, res->ai_addr, res->ai_addrlen))
return s;
debug(DBG_WARN, "bindtoaddr: bind failed");
close(s);
}
return -1;
}
int connectnonblocking(int s, const struct sockaddr *addr, socklen_t addrlen, struct timeval *timeout) {
int origflags, error = 0, r = -1;
fd_set writefds;
socklen_t len;
origflags = fcntl(s, F_GETFL, 0);
if (origflags == -1) {
debugerrno(errno, DBG_WARN, "Failed to get flags");
return -1;
}
if (fcntl(s, F_SETFL, origflags | O_NONBLOCK) == -1) {
debugerrno(errno, DBG_WARN, "Failed to set O_NONBLOCK");
return -1;
}
if (!connect(s, addr, addrlen)) {
r = 0;
goto exit;
}
if (errno != EINPROGRESS)
goto exit;
FD_ZERO(&writefds);
FD_SET(s, &writefds);
if (select(s + 1, NULL, &writefds, NULL, timeout) < 1)
goto exit;
len = sizeof(error);
if (!getsockopt(s, SOL_SOCKET, SO_ERROR, (char*)&error, &len) && !error)
r = 0;
exit:
if (fcntl(s, F_SETFL, origflags) == -1)
debugerrno(errno, DBG_WARN, "Failed to set original flags back");
return r;
}
int connecttcp(struct addrinfo *addrinfo, struct addrinfo *src, uint16_t timeout) {
int s;
struct addrinfo *res;
struct timeval to;
s = -1;
if (timeout) {
if (addrinfo && addrinfo->ai_next && timeout > 5)
timeout = 5;
to.tv_sec = timeout;
to.tv_usec = 0;
}
for (res = addrinfo; res; res = res->ai_next) {
s = bindtoaddr(src, res->ai_family, 1, 1);
if (s < 0) {
debug(DBG_WARN, "connecttoserver: socket failed");
continue;
}
if ((timeout
? connectnonblocking(s, res->ai_addr, res->ai_addrlen, &to)
: connect(s, res->ai_addr, res->ai_addrlen)) == 0)
break;
debug(DBG_WARN, "connecttoserver: connect failed");
close(s);
s = -1;
}
return s;
}
/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */
|
