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 <[email protected]>
37 *
38 * $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $
39 */
40
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
44 #include <sys/types.h>
45 #include <sys/socket.h>
46 #include <stdarg.h>
47 #include <netgraph/ng_message.h>
48 #include <netgraph/ng_socket.h>
49
50 #include "netgraph.h"
51 #include "internal.h"
52
53 /* The socket node type KLD */
54 #define NG_SOCKET_KLD "ng_socket.ko"
55
56 /*
57 * Create a socket type node and give it the supplied name.
58 * Return data and control sockets corresponding to the node.
59 * Returns -1 if error and sets errno.
60 */
61 int
NgMkSockNode(const char * name,int * csp,int * dsp)62 NgMkSockNode(const char *name, int *csp, int *dsp)
63 {
64 char namebuf[NG_NODESIZ];
65 int cs = -1; /* control socket */
66 int ds = -1; /* data socket */
67 int errnosv;
68
69 /* Empty name means no name */
70 if (name && *name == 0)
71 name = NULL;
72
73 /* Create control socket; this also creates the netgraph node.
74 If we get an EAFNOSUPPORT then the socket node type is
75 not loaded, so load it and try again. */
76 if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) {
77 #ifndef FSTACK
78 if (errno == EAFNOSUPPORT) {
79 if (kldload(NG_SOCKET_KLD) < 0) {
80 errnosv = errno;
81 if (_gNgDebugLevel >= 1)
82 NGLOG("can't load %s", NG_SOCKET_KLD);
83 goto errout;
84 }
85 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL);
86 if (cs >= 0)
87 goto gotNode;
88 }
89 #endif
90 errnosv = errno;
91 if (_gNgDebugLevel >= 1)
92 NGLOG("socket");
93 goto errout;
94 }
95
96 #ifndef FSTACK
97 gotNode:
98 #endif
99 /* Assign the node the desired name, if any */
100 if (name != NULL) {
101 u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
102 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
103
104 /* Assign name */
105 strlcpy(sg->sg_data, name, NG_NODESIZ);
106 sg->sg_family = AF_NETGRAPH;
107 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
108 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
109 errnosv = errno;
110 if (_gNgDebugLevel >= 1)
111 NGLOG("bind(%s)", sg->sg_data);
112 goto errout;
113 }
114
115 /* Save node name */
116 strlcpy(namebuf, name, sizeof(namebuf));
117 } else if (dsp != NULL) {
118 union {
119 u_char rbuf[sizeof(struct ng_mesg) +
120 sizeof(struct nodeinfo)];
121 struct ng_mesg res;
122 } res;
123 struct nodeinfo *const ni = (struct nodeinfo *) res.res.data;
124
125 /* Find out the node ID */
126 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
127 NGM_NODEINFO, NULL, 0) < 0) {
128 errnosv = errno;
129 if (_gNgDebugLevel >= 1)
130 NGLOG("send nodeinfo");
131 goto errout;
132 }
133 if (NgRecvMsg(cs, &res.res, sizeof(res.rbuf), NULL) < 0) {
134 errnosv = errno;
135 if (_gNgDebugLevel >= 1)
136 NGLOG("recv nodeinfo");
137 goto errout;
138 }
139
140 /* Save node "name" */
141 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
142 }
143
144 /* Create data socket if desired */
145 if (dsp != NULL) {
146 u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
147 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
148
149 /* Create data socket, initially just "floating" */
150 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
151 errnosv = errno;
152 if (_gNgDebugLevel >= 1)
153 NGLOG("socket");
154 goto errout;
155 }
156
157 /* Associate the data socket with the node */
158 snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
159 sg->sg_family = AF_NETGRAPH;
160 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
161 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
162 errnosv = errno;
163 if (_gNgDebugLevel >= 1)
164 NGLOG("connect(%s)", sg->sg_data);
165 goto errout;
166 }
167 }
168
169 /* Return the socket(s) */
170 if (csp)
171 *csp = cs;
172 else
173 close(cs);
174 if (dsp)
175 *dsp = ds;
176 return (0);
177
178 errout:
179 /* Failed */
180 if (cs >= 0)
181 close(cs);
182 if (ds >= 0)
183 close(ds);
184 errno = errnosv;
185 return (-1);
186 }
187
188 /*
189 * Assign a globally unique name to a node
190 * Returns -1 if error and sets errno.
191 */
192 int
NgNameNode(int cs,const char * path,const char * fmt,...)193 NgNameNode(int cs, const char *path, const char *fmt, ...)
194 {
195 struct ngm_name ngn;
196 va_list args;
197
198 /* Build message arg */
199 va_start(args, fmt);
200 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
201 va_end(args);
202
203 /* Send message */
204 if (NgSendMsg(cs, path,
205 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
206 if (_gNgDebugLevel >= 1)
207 NGLOGX("%s: failed", __func__);
208 return (-1);
209 }
210
211 /* Done */
212 return (0);
213 }
214
215 /*
216 * Read a packet from a data socket
217 * Returns -1 if error and sets errno.
218 */
219 int
NgRecvData(int ds,u_char * buf,size_t len,char * hook)220 NgRecvData(int ds, u_char * buf, size_t len, char *hook)
221 {
222 u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
223 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
224 socklen_t fromlen = sizeof(frombuf);
225 int rtn, errnosv;
226
227 /* Read packet */
228 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
229 if (rtn < 0) {
230 errnosv = errno;
231 if (_gNgDebugLevel >= 1)
232 NGLOG("recvfrom");
233 errno = errnosv;
234 return (-1);
235 }
236
237 /* Copy hook name */
238 if (hook != NULL)
239 strlcpy(hook, from->sg_data, NG_HOOKSIZ);
240
241 /* Debugging */
242 if (_gNgDebugLevel >= 2) {
243 NGLOGX("READ %s from hook \"%s\" (%d bytes)",
244 rtn ? "PACKET" : "EOF", from->sg_data, rtn);
245 if (_gNgDebugLevel >= 3)
246 _NgDebugBytes(buf, rtn);
247 }
248
249 /* Done */
250 return (rtn);
251 }
252
253 /*
254 * Identical to NgRecvData() except buffer is dynamically allocated.
255 */
256 int
NgAllocRecvData(int ds,u_char ** buf,char * hook)257 NgAllocRecvData(int ds, u_char **buf, char *hook)
258 {
259 int len;
260 #ifndef FSTACK
261 socklen_t optlen;
262
263 optlen = sizeof(len);
264 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
265 #else
266 len = NGCTL_DEFAULT_RCVBUF;
267 if (
268 #endif
269 (*buf = malloc(len)) == NULL)
270 return (-1);
271 if ((len = NgRecvData(ds, *buf, len, hook)) < 0)
272 free(*buf);
273 return (len);
274 }
275
276 /*
277 * Write a packet to a data socket. The packet will be sent
278 * out the corresponding node on the specified hook.
279 * Returns -1 if error and sets errno.
280 */
281 int
NgSendData(int ds,const char * hook,const u_char * buf,size_t len)282 NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
283 {
284 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
285 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
286 int errnosv;
287
288 /* Set up destination hook */
289 sg->sg_family = AF_NETGRAPH;
290 strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
291 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
292
293 /* Debugging */
294 if (_gNgDebugLevel >= 2) {
295 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
296 _NgDebugSockaddr(sg);
297 if (_gNgDebugLevel >= 3)
298 _NgDebugBytes(buf, len);
299 }
300
301 /* Send packet */
302 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
303 errnosv = errno;
304 if (_gNgDebugLevel >= 1)
305 NGLOG("sendto(%s)", sg->sg_data);
306 errno = errnosv;
307 return (-1);
308 }
309
310 /* Done */
311 return (0);
312 }
313
314