1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <sys/stat.h>
37 #include <netinet/in.h>
38 #include <errno.h>
39 #include <unistd.h>
40 #include <stdlib.h>
41 #include <string.h>
42
43 /*
44 * XXX The functions in this file are only needed to support transport
45 * providers that have not yet been converted to use /etc/sock2path.d.
46 * Once all transport providers have been converted this file can be
47 * removed.
48 */
49
50 static struct netconfig *_s_match_netconf(int family, int type, int proto,
51 void **nethandle);
52
53 /*
54 * The following two string arrays map a number as specified
55 * by a user of sockets, to the string as would be returned
56 * by a call to getnetconfig().
57 *
58 * They are used by _s_match_netconf();
59 *
60 * proto_sw contains protocol entries for which there is a corresponding
61 * /dev device. All others would presumably use raw IP and download the
62 * desired protocol.
63 */
64 static char *proto_sw[] = {
65 "",
66 "icmp", /* 1 = ICMP */
67 "",
68 "",
69 "",
70 "",
71 "tcp", /* 6 = TCP */
72 "",
73 "",
74 "",
75 "",
76 "",
77 "",
78 "",
79 "",
80 "",
81 "",
82 "udp", /* 17 = UDP */
83 };
84
85 static char *family_sw[] = {
86 "-", /* 0 = AF_UNSPEC */
87 "loopback", /* 1 = AF_UNIX */
88 "inet", /* 2 = AF_INET */
89 "implink", /* 3 = AF_IMPLINK */
90 "pup", /* 4 = AF_PUP */
91 "chaos", /* 5 = AF_CHAOS */
92 "ns", /* 6 = AF_NS */
93 "nbs", /* 7 = AF_NBS */
94 "ecma", /* 8 = AF_ECMA */
95 "datakit", /* 9 = AF_DATAKIT */
96 "ccitt", /* 10 = AF_CCITT */
97 "sna", /* 11 = AF_SNA */
98 "decnet", /* 12 = AF_DECnet */
99 "dli", /* 13 = AF_DLI */
100 "lat", /* 14 = AF_LAT */
101 "hylink", /* 15 = AF_HYLINK */
102 "appletalk", /* 16 = AF_APPLETALK */
103 "nit", /* 17 = AF_NIT */
104 "ieee802", /* 18 = AF_802 */
105 "osi", /* 19 = AF_OSI */
106 "x25", /* 20 = AF_X25 */
107 "osinet", /* 21 = AF_OSINET */
108 "gosip", /* 22 = AF_GOSIP */
109 "ipx", /* 23 = AF_IPX */
110 "route", /* 24 = AF_ROUTE */
111 "link", /* 25 = AF_LINK */
112 "inet6", /* 26 = AF_INET6 */
113 "key", /* 27 = AF_KEY */
114 };
115
116 /*
117 * Lookup family/type/protocol in /etc/netconfig.
118 * Returns the pathname and a prototype value (to be passed into SO_PROTOTYPE)
119 * The path is malloc'ed and has to be freed by the caller.
120 */
121 int
122 _s_netconfig_path(int family, int type, int protocol,
123 char **pathp, int *prototype)
124 {
125 struct netconfig *net;
126 void *nethandle;
127 struct stat stats;
128
129 net = _s_match_netconf(family, type, protocol, &nethandle);
130 if (net == NULL)
131 return (-1);
132
133 if (strcmp(net->nc_proto, NC_NOPROTO) != 0)
134 *prototype = 0;
135 else
136 *prototype = protocol;
137
138 retry:
139 if (stat(net->nc_device, &stats) < 0) {
140 switch (errno) {
141 case EINTR:
142 goto retry;
143
144 case ENOENT:
145 case ENOLINK:
146 case ELOOP:
147 case EMULTIHOP:
148 case ENOTDIR:
149 errno = EPFNOSUPPORT;
150 break;
151 }
152 endnetconfig(nethandle); /* finished with netconfig struct */
153 return (-1);
154 }
155 if (!S_ISCHR(stats.st_mode)) {
156 errno = EPFNOSUPPORT;
157 endnetconfig(nethandle); /* finished with netconfig struct */
158 return (-1);
159 }
160 *pathp = malloc(strlen(net->nc_device) + 1);
161 if (*pathp == NULL) {
162 endnetconfig(nethandle);
163 errno = ENOMEM;
164 return (-1);
165 }
166 (void) strcpy(*pathp, net->nc_device);
167 endnetconfig(nethandle); /* finished with netconfig struct */
168 return (0);
169 }
170
171 /*
172 * Match config entry for protocol
173 * requested.
174 */
175 static struct netconfig *
176 _s_match_netconf(int family, int type, int proto, void **nethandle)
177 {
178 struct netconfig *net;
179 struct netconfig *maybe;
180 char *oproto;
181
182 if (family < 0 ||
183 family >= (int)sizeof (family_sw) / (int)sizeof (char *) ||
184 proto < 0 || proto >= IPPROTO_MAX) {
185 errno = EPROTONOSUPPORT;
186 return (NULL);
187 }
188 if (proto) {
189 if (proto >= (int)sizeof (proto_sw) / (int)sizeof (char *))
190 oproto = "";
191 else
192 oproto = proto_sw[proto];
193 }
194
195 /*
196 * Loop through each entry in netconfig
197 * until one matches or we reach the end.
198 */
199 if ((*nethandle = setnetconfig()) == NULL) {
200 return (NULL);
201 }
202
203 maybe = NULL;
204 while ((net = getnetconfig(*nethandle)) != NULL) {
205 /*
206 * We make a copy of net->nc_semantics rather than modifying
207 * it in place because the network selection code shares the
208 * structures returned by getnetconfig() among all its callers.
209 * See bug #1160886 for more details.
210 */
211 unsigned int semantics = net->nc_semantics;
212
213 if (semantics == NC_TPI_COTS_ORD)
214 semantics = NC_TPI_COTS;
215 if (proto) {
216 if (strcmp(net->nc_protofmly, family_sw[family]) == 0 &&
217 semantics == type &&
218 strcmp(net->nc_proto, oproto) == 0)
219 break;
220
221 if (strcmp(net->nc_protofmly, family_sw[family]) == 0 &&
222 type == SOCK_RAW &&
223 semantics == SOCK_RAW &&
224 strcmp(net->nc_proto, NC_NOPROTO) == 0 &&
225 maybe == NULL)
226 maybe = net; /* in case no exact match */
227
228 continue;
229 } else {
230 if (strcmp(net->nc_protofmly, family_sw[family]) == 0 &&
231 semantics == type) {
232 break;
233 }
234 }
235 }
236 if (net == NULL && maybe)
237 net = maybe;
238
239 if (net == NULL) {
240 endnetconfig(*nethandle);
241 errno = EPROTONOSUPPORT;
242 return (NULL);
243 }
244
245 return (net);
246 }