1 /*
2 * sock.c
3 *
4 * Copyright (c) 1996-1999 Whistle Communications, Inc.
5 * All rights reserved.
6 *
7 * Subject to the following obligations and disclaimer of warranty, use and
8 * redistribution of this software, in source or object code forms, with or
9 * without modifications are expressly permitted by Whistle Communications;
10 * provided, however, that:
11 * 1. Any and all reproductions of the source or object code must include the
12 * copyright notice above and the following disclaimer of warranties; and
13 * 2. No rights are granted, in any manner or form, to use Whistle
14 * Communications, Inc. trademarks, including the mark "WHISTLE
15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
16 * such appears in the above copyright notice or in the software.
17 *
18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
34 * OF SUCH DAMAGE.
35 *
36 * Author: Archie Cobbs <archie@whistle.com>
37 *
38 * $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $
39 */
40
41 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <stdarg.h>
44 #include <netgraph/ng_message.h>
45 #include <netgraph/ng_socket.h>
46
47 #include "netgraph.h"
48 #include "internal.h"
49
50 /* The socket node type KLD */
51 #define NG_SOCKET_KLD "ng_socket.ko"
52
53 /*
54 * Create a socket type node and give it the supplied name.
55 * Return data and control sockets corresponding to the node.
56 * Returns -1 if error and sets errno.
57 */
58 int
NgMkSockNode(const char * name,int * csp,int * dsp)59 NgMkSockNode(const char *name, int *csp, int *dsp)
60 {
61 char namebuf[NG_NODESIZ];
62 int cs = -1; /* control socket */
63 int ds = -1; /* data socket */
64 int errnosv;
65
66 /* Empty name means no name */
67 if (name && *name == 0)
68 name = NULL;
69
70 /* Create control socket; this also creates the netgraph node.
71 If we get an EAFNOSUPPORT then the socket node type is
72 not loaded, so load it and try again. */
73 if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) {
74 if (errno == EAFNOSUPPORT) {
75 if (kldload(NG_SOCKET_KLD) < 0) {
76 errnosv = errno;
77 if (_gNgDebugLevel >= 1)
78 NGLOG("can't load %s", NG_SOCKET_KLD);
79 goto errout;
80 }
81 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL);
82 if (cs >= 0)
83 goto gotNode;
84 }
85 errnosv = errno;
86 if (_gNgDebugLevel >= 1)
87 NGLOG("socket");
88 goto errout;
89 }
90
91 gotNode:
92 /* Assign the node the desired name, if any */
93 if (name != NULL) {
94 u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
95 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
96
97 /* Assign name */
98 strlcpy(sg->sg_data, name, NG_NODESIZ);
99 sg->sg_family = AF_NETGRAPH;
100 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
101 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
102 errnosv = errno;
103 if (_gNgDebugLevel >= 1)
104 NGLOG("bind(%s)", sg->sg_data);
105 goto errout;
106 }
107
108 /* Save node name */
109 strlcpy(namebuf, name, sizeof(namebuf));
110 } else if (dsp != NULL) {
111 union {
112 u_char rbuf[sizeof(struct ng_mesg) +
113 sizeof(struct nodeinfo)];
114 struct ng_mesg res;
115 } res;
116 struct nodeinfo *const ni = (struct nodeinfo *) res.res.data;
117
118 /* Find out the node ID */
119 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
120 NGM_NODEINFO, NULL, 0) < 0) {
121 errnosv = errno;
122 if (_gNgDebugLevel >= 1)
123 NGLOG("send nodeinfo");
124 goto errout;
125 }
126 if (NgRecvMsg(cs, &res.res, sizeof(res.rbuf), NULL) < 0) {
127 errnosv = errno;
128 if (_gNgDebugLevel >= 1)
129 NGLOG("recv nodeinfo");
130 goto errout;
131 }
132
133 /* Save node "name" */
134 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
135 }
136
137 /* Create data socket if desired */
138 if (dsp != NULL) {
139 u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
140 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
141
142 /* Create data socket, initially just "floating" */
143 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
144 errnosv = errno;
145 if (_gNgDebugLevel >= 1)
146 NGLOG("socket");
147 goto errout;
148 }
149
150 /* Associate the data socket with the node */
151 snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
152 sg->sg_family = AF_NETGRAPH;
153 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
154 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
155 errnosv = errno;
156 if (_gNgDebugLevel >= 1)
157 NGLOG("connect(%s)", sg->sg_data);
158 goto errout;
159 }
160 }
161
162 /* Return the socket(s) */
163 if (csp)
164 *csp = cs;
165 else
166 close(cs);
167 if (dsp)
168 *dsp = ds;
169 return (0);
170
171 errout:
172 /* Failed */
173 if (cs >= 0)
174 close(cs);
175 if (ds >= 0)
176 close(ds);
177 errno = errnosv;
178 return (-1);
179 }
180
181 /*
182 * Assign a globally unique name to a node
183 * Returns -1 if error and sets errno.
184 */
185 int
NgNameNode(int cs,const char * path,const char * fmt,...)186 NgNameNode(int cs, const char *path, const char *fmt, ...)
187 {
188 struct ngm_name ngn;
189 va_list args;
190
191 /* Build message arg */
192 va_start(args, fmt);
193 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
194 va_end(args);
195
196 /* Send message */
197 if (NgSendMsg(cs, path,
198 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
199 if (_gNgDebugLevel >= 1)
200 NGLOGX("%s: failed", __func__);
201 return (-1);
202 }
203
204 /* Done */
205 return (0);
206 }
207
208 /*
209 * Read a packet from a data socket
210 * Returns -1 if error and sets errno.
211 */
212 int
NgRecvData(int ds,u_char * buf,size_t len,char * hook)213 NgRecvData(int ds, u_char * buf, size_t len, char *hook)
214 {
215 u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
216 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
217 socklen_t fromlen = sizeof(frombuf);
218 int rtn, errnosv;
219
220 /* Read packet */
221 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
222 if (rtn < 0) {
223 errnosv = errno;
224 if (_gNgDebugLevel >= 1)
225 NGLOG("recvfrom");
226 errno = errnosv;
227 return (-1);
228 }
229
230 /* Copy hook name */
231 if (hook != NULL)
232 strlcpy(hook, from->sg_data, NG_HOOKSIZ);
233
234 /* Debugging */
235 if (_gNgDebugLevel >= 2) {
236 NGLOGX("READ %s from hook \"%s\" (%d bytes)",
237 rtn ? "PACKET" : "EOF", from->sg_data, rtn);
238 if (_gNgDebugLevel >= 3)
239 _NgDebugBytes(buf, rtn);
240 }
241
242 /* Done */
243 return (rtn);
244 }
245
246 /*
247 * Identical to NgRecvData() except buffer is dynamically allocated.
248 */
249 int
NgAllocRecvData(int ds,u_char ** buf,char * hook)250 NgAllocRecvData(int ds, u_char **buf, char *hook)
251 {
252 int len;
253 socklen_t optlen;
254
255 optlen = sizeof(len);
256 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
257 (*buf = malloc(len)) == NULL)
258 return (-1);
259 if ((len = NgRecvData(ds, *buf, len, hook)) < 0)
260 free(*buf);
261 return (len);
262 }
263
264 /*
265 * Write a packet to a data socket. The packet will be sent
266 * out the corresponding node on the specified hook.
267 * Returns -1 if error and sets errno.
268 */
269 int
NgSendData(int ds,const char * hook,const u_char * buf,size_t len)270 NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
271 {
272 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
273 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
274 int errnosv;
275
276 /* Set up destination hook */
277 sg->sg_family = AF_NETGRAPH;
278 strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
279 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
280
281 /* Debugging */
282 if (_gNgDebugLevel >= 2) {
283 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
284 _NgDebugSockaddr(sg);
285 if (_gNgDebugLevel >= 3)
286 _NgDebugBytes(buf, len);
287 }
288
289 /* Send packet */
290 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
291 errnosv = errno;
292 if (_gNgDebugLevel >= 1)
293 NGLOG("sendto(%s)", sg->sg_data);
294 errno = errnosv;
295 return (-1);
296 }
297
298 /* Done */
299 return (0);
300 }
301
302