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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
/*++
/* NAME
/* normalize_mailhost_addr 3
/* SUMMARY
/* normalize mailhost address string representation
/* SYNOPSIS
/* #include <normalize_mailhost_addr.h>
/*
/* int normalize_mailhost_addr(
/* const char *string,
/* char **mailhost_addr,
/* char **bare_addr,
/* int *addr_family)
/* DESCRIPTION
/* normalize_mailhost_addr() takes the RFC 2821 string
/* representation of an IPv4 or IPv6 network address, and
/* normalizes the "IPv6:" prefix and numeric form. An IPv6 or
/* IPv4 form is rejected if supposed for that protocol is
/* disabled or non-existent. If both IPv6 and IPv4 support are
/* enabled, a V4-in-V6 address is replaced with the IPv4 form.
/*
/* Arguments:
/* .IP string
/* Null-terminated string with the RFC 2821 string representation
/* of an IPv4 or IPv6 network address.
/* .IP mailhost_addr
/* Null pointer, or pointer to null-terminated string with the
/* normalized RFC 2821 string representation of an IPv4 or
/* IPv6 network address. Storage must be freed with myfree().
/* .IP bare_addr
/* Null pointer, or pointer to null-terminated string with the
/* numeric address without prefix, such as "IPv6:". Storage
/* must be freed with myfree().
/* .IP addr_family
/* Null pointer, or pointer to integer for storing the address
/* family.
/* DIAGNOSTICS
/* normalize_mailhost_addr() returns -1 if the input is malformed,
/* zero otherwise.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/*
* System library.
*/
#include <sys_defs.h>
#include <string.h>
#ifdef STRCASECMP_IN_STRINGS_H
#include <strings.h>
#endif
/*
* Utility library.
*/
#include <inet_proto.h>
#include <msg.h>
#include <myaddrinfo.h>
#include <mymalloc.h>
#include <stringops.h>
/*
* Global library.
*/
#include <normalize_mailhost_addr.h>
#include <valid_mailhost_addr.h>
/* normalize_mailhost_addr - parse and normalize mailhost IP address */
int normalize_mailhost_addr(const char *string, char **mailhost_addr,
char **bare_addr, int *addr_family)
{
const char myname[] = "normalize_mailhost_addr";
const INET_PROTO_INFO *proto_info = inet_proto_info();
struct addrinfo *res = 0;
MAI_HOSTADDR_STR hostaddr;
const char *valid_addr; /* IPv6:fc00::1 */
const char *normal_addr; /* 192.168.0.1 */
int normal_family;
#define UPDATE_BARE_ADDR(s, v) do { \
if (s) myfree(s); \
(s) = mystrdup(v); \
} while(0)
#define UPDATE_MAILHOST_ADDR(s, prefix, addr) do { \
if (s) myfree(s); \
(s) = concatenate((prefix), (addr), (char *) 0); \
} while (0)
/*
* Parse and normalize the input.
*/
if ((valid_addr = valid_mailhost_addr(string, DONT_GRIPE)) == 0
|| hostaddr_to_sockaddr(valid_addr, (char *) 0, 0, &res) != 0
|| sockaddr_to_hostaddr(res->ai_addr, res->ai_addrlen,
&hostaddr, (MAI_SERVPORT_STR *) 0, 0) != 0) {
normal_addr = 0;
#ifdef HAS_IPV6
} else if (res->ai_family == AF_INET6
&& strncasecmp("::ffff:", hostaddr.buf, 7) == 0
&& strchr((char *) proto_info->sa_family_list, AF_INET)) {
normal_addr = hostaddr.buf + 7;
normal_family = AF_INET;
#endif
} else if (strchr((char *) proto_info->sa_family_list, res->ai_family)) {
normal_addr = hostaddr.buf;
normal_family = res->ai_family;
} else {
normal_addr = 0;
}
if (res)
freeaddrinfo(res);
if (normal_addr == 0)
return (-1);
/*
* Write the applicable outputs.
*/
if (bare_addr) {
UPDATE_BARE_ADDR(*bare_addr, normal_addr);
if (msg_verbose)
msg_info("%s: bare_addr=%s", myname, *bare_addr);
}
if (mailhost_addr) {
#ifdef HAS_IPV6
if (normal_family == AF_INET6)
UPDATE_MAILHOST_ADDR(*mailhost_addr, IPV6_COL, normal_addr);
else
#endif
UPDATE_BARE_ADDR(*mailhost_addr, normal_addr);
if (msg_verbose)
msg_info("%s: mailhost_addr=%s", myname, *mailhost_addr);
}
if (addr_family) {
*addr_family = normal_family;
if (msg_verbose)
msg_info("%s: addr_family=%s", myname,
*addr_family == AF_INET6 ? "AF_INET6"
: *addr_family == AF_INET ? "AF_INET"
: "unknown");
}
return (0);
}
/*
* Test program.
*/
#ifdef TEST
#include <stdlib.h>
#include <mymalloc.h>
#include <msg.h>
/*
* Main test program.
*/
int main(int argc, char **argv)
{
/* Test cases with inputs and expected outputs. */
typedef struct TEST_CASE {
const char *inet_protocols;
const char *mailhost_addr;
int exp_return;
const char *exp_mailhost_addr;
char *exp_bare_addr;
int exp_addr_family;
} TEST_CASE;
static TEST_CASE test_cases[] = {
/* IPv4 in IPv6. */
{"ipv4, ipv6", "ipv6:::ffff:1.2.3.4", 0, "1.2.3.4", "1.2.3.4", AF_INET},
{"ipv6", "ipv6:::ffff:1.2.3.4", 0, "IPv6:::ffff:1.2.3.4", "::ffff:1.2.3.4", AF_INET6},
/* Pass IPv4 or IPV6. */
{"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", "fc00::1", AF_INET6},
{"ipv4, ipv6", "1.2.3.4", 0, "1.2.3.4", "1.2.3.4", AF_INET},
/* Normalize IPv4 or IPV6. */
{"ipv4, ipv6", "ipv6:fc00::0", 0, "IPv6:fc00::", "fc00::", AF_INET6},
{"ipv4, ipv6", "01.02.03.04", 0, "1.2.3.4", "1.2.3.4", AF_INET},
/* Suppress specific outputs. */
{"ipv4, ipv6", "ipv6:fc00::1", 0, 0, "fc00::1", AF_INET6},
{"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", 0, AF_INET6},
{"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", "fc00::1", -1},
/* Address type mismatch. */
{"ipv4, ipv6", "::ffff:1.2.3.4", -1},
{"ipv4", "ipv6:fc00::1", -1},
{"ipv6", "1.2.3.4", -1},
0,
};
TEST_CASE *test_case;
/* Actual results. */
int act_return;
char *act_mailhost_addr = mystrdup("initial_mailhost_addr");
char *act_bare_addr = mystrdup("initial_bare_addr");
int act_addr_family = 0xdeadbeef;
/* Findings. */
int tests_failed = 0;
int test_failed;
for (tests_failed = 0, test_case = test_cases; test_case->inet_protocols;
tests_failed += test_failed, test_case++) {
test_failed = 0;
inet_proto_init(argv[0], test_case->inet_protocols);
act_return =
normalize_mailhost_addr(test_case->mailhost_addr,
test_case->exp_mailhost_addr ?
&act_mailhost_addr : (char **) 0,
test_case->exp_bare_addr ?
&act_bare_addr : (char **) 0,
test_case->exp_addr_family >= 0 ?
&act_addr_family : (int *) 0);
if (act_return != test_case->exp_return) {
msg_warn("test case %d return expected=%d actual=%d",
(int) (test_case - test_cases),
test_case->exp_return, act_return);
test_failed = 1;
continue;
}
if (test_case->exp_return != 0)
continue;
if (test_case->exp_mailhost_addr
&& strcmp(test_case->exp_mailhost_addr, act_mailhost_addr)) {
msg_warn("test case %d mailhost_addr expected=%s actual=%s",
(int) (test_case - test_cases),
test_case->exp_mailhost_addr, act_mailhost_addr);
test_failed = 1;
}
if (test_case->exp_bare_addr
&& strcmp(test_case->exp_bare_addr, act_bare_addr)) {
msg_warn("test case %d bare_addr expected=%s actual=%s",
(int) (test_case - test_cases),
test_case->exp_bare_addr, act_bare_addr);
test_failed = 1;
}
if (test_case->exp_addr_family >= 0
&& test_case->exp_addr_family != act_addr_family) {
msg_warn("test case %d addr_family expected=0x%x actual=0x%x",
(int) (test_case - test_cases),
test_case->exp_addr_family, act_addr_family);
test_failed = 1;
}
}
if (act_mailhost_addr)
myfree(act_mailhost_addr);
if (act_bare_addr)
myfree(act_bare_addr);
if (tests_failed)
msg_info("tests failed: %d", tests_failed);
exit(tests_failed != 0);
}
#endif
|
