Initial import from FreeBSD RELENG_4:
[dragonfly.git] / lib / libnetgraph / sock.c
CommitLineData
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MD
1
2/*
3 * sock.c
4 *
5 * Copyright (c) 1996-1999 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Archie Cobbs <archie@whistle.com>
38 *
39 * $FreeBSD: src/lib/libnetgraph/sock.c,v 1.2 2000/01/28 00:48:27 archie Exp $
40 * $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $
41 */
42
43#include <sys/types.h>
44#include <stdarg.h>
45#include <netgraph/ng_message.h>
46#include <netgraph/ng_socket.h>
47
48#include "netgraph.h"
49#include "internal.h"
50
51/* The socket node type KLD */
52#define NG_SOCKET_KLD "ng_socket.ko"
53
54/*
55 * Create a socket type node and give it the supplied name.
56 * Return data and control sockets corresponding to the node.
57 * Returns -1 if error and sets errno.
58 */
59int
60NgMkSockNode(const char *name, int *csp, int *dsp)
61{
62 char namebuf[NG_NODELEN + 1];
63 int cs = -1; /* control socket */
64 int ds = -1; /* data socket */
65 int errnosv;
66
67 /* Empty name means no name */
68 if (name && *name == 0)
69 name = NULL;
70
71 /* Create control socket; this also creates the netgraph node.
72 If we get a EPROTONOSUPPORT then the socket node type is
73 not loaded, so load it and try again. */
74 if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) {
75 if (errno == EPROTONOSUPPORT) {
76 if (kldload(NG_SOCKET_KLD) < 0) {
77 errnosv = errno;
78 if (_gNgDebugLevel >= 1)
79 NGLOG("can't load %s", NG_SOCKET_KLD);
80 goto errout;
81 }
82 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL);
83 if (cs >= 0)
84 goto gotNode;
85 }
86 errnosv = errno;
87 if (_gNgDebugLevel >= 1)
88 NGLOG("socket");
89 goto errout;
90 }
91
92gotNode:
93 /* Assign the node the desired name, if any */
94 if (name != NULL) {
95 u_char sbuf[NG_NODELEN + 3];
96 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
97
98 /* Assign name */
99 snprintf(sg->sg_data, NG_NODELEN + 1, "%s", name);
100 sg->sg_family = AF_NETGRAPH;
101 sg->sg_len = strlen(sg->sg_data) + 3;
102 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
103 errnosv = errno;
104 if (_gNgDebugLevel >= 1)
105 NGLOG("bind(%s)", sg->sg_data);
106 goto errout;
107 }
108
109 /* Save node name */
110 snprintf(namebuf, sizeof(namebuf), "%s", name);
111 } else if (dsp != NULL) {
112 u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
113 struct ng_mesg *const resp = (struct ng_mesg *) rbuf;
114 struct nodeinfo *const ni = (struct nodeinfo *) resp->data;
115
116 /* Find out the node ID */
117 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
118 NGM_NODEINFO, NULL, 0) < 0) {
119 errnosv = errno;
120 if (_gNgDebugLevel >= 1)
121 NGLOG("send nodeinfo");
122 goto errout;
123 }
124 if (NgRecvMsg(cs, resp, sizeof(rbuf), NULL) < 0) {
125 errnosv = errno;
126 if (_gNgDebugLevel >= 1)
127 NGLOG("recv nodeinfo");
128 goto errout;
129 }
130
131 /* Save node "name" */
132 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
133 }
134
135 /* Create data socket if desired */
136 if (dsp != NULL) {
137 u_char sbuf[NG_NODELEN + 4];
138 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
139
140 /* Create data socket, initially just "floating" */
141 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
142 errnosv = errno;
143 if (_gNgDebugLevel >= 1)
144 NGLOG("socket");
145 goto errout;
146 }
147
148 /* Associate the data socket with the node */
149 snprintf(sg->sg_data, NG_NODELEN + 2, "%s:", namebuf);
150 sg->sg_family = AF_NETGRAPH;
151 sg->sg_len = strlen(sg->sg_data) + 3;
152 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
153 errnosv = errno;
154 if (_gNgDebugLevel >= 1)
155 NGLOG("connect(%s)", sg->sg_data);
156 goto errout;
157 }
158 }
159
160 /* Return the socket(s) */
161 if (csp)
162 *csp = cs;
163 else
164 close(cs);
165 if (dsp)
166 *dsp = ds;
167 return (0);
168
169errout:
170 /* Failed */
171 if (cs >= 0)
172 close(cs);
173 if (ds >= 0)
174 close(ds);
175 errno = errnosv;
176 return (-1);
177}
178
179/*
180 * Assign a globally unique name to a node
181 * Returns -1 if error and sets errno.
182 */
183int
184NgNameNode(int cs, const char *path, const char *fmt, ...)
185{
186 struct ngm_name ngn;
187 va_list args;
188
189 /* Build message arg */
190 va_start(args, fmt);
191 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
192 va_end(args);
193
194 /* Send message */
195 if (NgSendMsg(cs, path,
196 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
197 if (_gNgDebugLevel >= 1)
198 NGLOGX("%s: failed", __FUNCTION__);
199 return (-1);
200 }
201
202 /* Done */
203 return (0);
204}
205
206/*
207 * Read a packet from a data socket
208 * Returns -1 if error and sets errno.
209 */
210int
211NgRecvData(int ds, u_char * buf, size_t len, char *hook)
212{
213 u_char frombuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
214 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
215 int fromlen = sizeof(frombuf);
216 int rtn, errnosv;
217
218 /* Read packet */
219 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
220 if (rtn < 0) {
221 errnosv = errno;
222 if (_gNgDebugLevel >= 1)
223 NGLOG("recvfrom");
224 errno = errnosv;
225 return (-1);
226 }
227
228 /* Copy hook name */
229 if (hook != NULL)
230 snprintf(hook, NG_HOOKLEN + 1, "%s", from->sg_data);
231
232 /* Debugging */
233 if (_gNgDebugLevel >= 2) {
234 NGLOGX("READ %s from hook \"%s\" (%d bytes)",
235 rtn ? "PACKET" : "EOF", from->sg_data, rtn);
236 if (_gNgDebugLevel >= 3)
237 _NgDebugBytes(buf, rtn);
238 }
239
240 /* Done */
241 return (rtn);
242}
243
244/*
245 * Write a packet to a data socket. The packet will be sent
246 * out the corresponding node on the specified hook.
247 * Returns -1 if error and sets errno.
248 */
249int
250NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
251{
252 u_char sgbuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
253 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
254 int errnosv;
255
256 /* Set up destination hook */
257 sg->sg_family = AF_NETGRAPH;
258 snprintf(sg->sg_data, NG_HOOKLEN + 1, "%s", hook);
259 sg->sg_len = strlen(sg->sg_data) + 3;
260
261 /* Debugging */
262 if (_gNgDebugLevel >= 2) {
263 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
264 _NgDebugSockaddr(sg);
265 if (_gNgDebugLevel >= 3)
266 _NgDebugBytes(buf, len);
267 }
268
269 /* Send packet */
270 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
271 errnosv = errno;
272 if (_gNgDebugLevel >= 1)
273 NGLOG("sendto(%s)", sg->sg_data);
274 errno = errnosv;
275 return (-1);
276 }
277
278 /* Done */
279 return (0);
280}
281