1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/krb5/os/addr.c - socket address utilities */
3 /*
4 * Copyright (C) 2024 by the Massachusetts Institute of Technology.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
24 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
26 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
28 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
30 * OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include "k5-int.h"
34 #include "socket-utils.h"
35
36 const krb5_address k5_addr_directional_init = {
37 KV5M_ADDRESS, ADDRTYPE_DIRECTIONAL, 4, (uint8_t *)"\x00\x00\x00\x00"
38 };
39 const krb5_address k5_addr_directional_accept = {
40 KV5M_ADDRESS, ADDRTYPE_DIRECTIONAL, 4, (uint8_t *)"\x00\x00\x00\x01"
41 };
42
43 krb5_error_code
k5_sockaddr_to_address(const struct sockaddr * sa,krb5_boolean local_use,krb5_address * out)44 k5_sockaddr_to_address(const struct sockaddr *sa, krb5_boolean local_use,
45 krb5_address *out)
46 {
47 if (sa->sa_family == AF_INET) {
48 const struct sockaddr_in *sin = sa2sin(sa);
49 out->addrtype = ADDRTYPE_INET;
50 out->length = sizeof(sin->sin_addr);
51 out->contents = (uint8_t *)&sin->sin_addr;
52 } else if (sa->sa_family == AF_INET6) {
53 const struct sockaddr_in6 *sin6 = sa2sin6(sa);
54 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
55 out->addrtype = ADDRTYPE_INET;
56 out->contents = (uint8_t *)&sin6->sin6_addr + 12;
57 out->length = 4;
58 } else {
59 out->addrtype = ADDRTYPE_INET6;
60 out->length = sizeof(sin6->sin6_addr);
61 out->contents = (uint8_t *)&sin6->sin6_addr;
62 }
63 #ifndef _WIN32
64 } else if (sa->sa_family == AF_UNIX && local_use) {
65 const struct sockaddr_un *sun = sa2sun(sa);
66 out->addrtype = ADDRTYPE_UNIXSOCK;
67 out->length = strlen(sun->sun_path);
68 out->contents = (uint8_t *)sun->sun_path;
69 #endif
70 } else {
71 return KRB5_PROG_ATYPE_NOSUPP;
72 }
73 out->magic = KV5M_ADDRESS;
74 return 0;
75 }
76
77 void
k5_print_addr(const struct sockaddr * sa,char * buf,size_t len)78 k5_print_addr(const struct sockaddr *sa, char *buf, size_t len)
79 {
80 if (sa_is_inet(sa)) {
81 if (getnameinfo(sa, sa_socklen(sa), buf, len, NULL, 0,
82 NI_NUMERICHOST | NI_NUMERICSERV) != 0)
83 strlcpy(buf, "<unknown>", len);
84 #ifndef _WIN32
85 } else if (sa->sa_family == AF_UNIX) {
86 strlcpy(buf, sa2sun(sa)->sun_path, len);
87 #endif
88 } else {
89 strlcpy(buf, "<unknown>", len);
90 }
91 }
92
93 void
k5_print_addr_port(const struct sockaddr * sa,char * buf,size_t len)94 k5_print_addr_port(const struct sockaddr *sa, char *buf, size_t len)
95 {
96 char addr[64], port[10];
97
98 if (sa_is_inet(sa)) {
99 if (getnameinfo(sa, sa_socklen(sa), addr, sizeof(addr), port,
100 sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
101 strlcpy(buf, "<unknown>", len);
102 } else if (sa->sa_family == AF_INET) {
103 (void)snprintf(buf, len, "%s:%s", addr, port);
104 } else {
105 (void)snprintf(buf, len, "[%s]:%s", addr, port);
106 }
107 } else {
108 k5_print_addr(sa, buf, len);
109 }
110 }
111