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 #include <sys/types.h>
43 #include <sys/socket.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 */
59 int
NgMkSockNode(const char * name,int * csp,int * dsp)60 NgMkSockNode(const char *name, int *csp, int *dsp)
61 {
62 char namebuf[NG_NODESIZ];
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 an EAFNOSUPPORT 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 == EAFNOSUPPORT) {
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
92 gotNode:
93 /* Assign the node the desired name, if any */
94 if (name != NULL) {
95 u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
96 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
97
98 /* Assign name */
99 strlcpy(sg->sg_data, name, NG_NODESIZ);
100 sg->sg_family = AF_NETGRAPH;
101 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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 strlcpy(namebuf, name, sizeof(namebuf));
111 } else if (dsp != NULL) {
112 union {
113 u_char rbuf[sizeof(struct ng_mesg) +
114 sizeof(struct nodeinfo)];
115 struct ng_mesg res;
116 } res;
117 struct nodeinfo *const ni = (struct nodeinfo *) res.res.data;
118
119 /* Find out the node ID */
120 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
121 NGM_NODEINFO, NULL, 0) < 0) {
122 errnosv = errno;
123 if (_gNgDebugLevel >= 1)
124 NGLOG("send nodeinfo");
125 goto errout;
126 }
127 if (NgRecvMsg(cs, &res.res, sizeof(res.rbuf), NULL) < 0) {
128 errnosv = errno;
129 if (_gNgDebugLevel >= 1)
130 NGLOG("recv nodeinfo");
131 goto errout;
132 }
133
134 /* Save node "name" */
135 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
136 }
137
138 /* Create data socket if desired */
139 if (dsp != NULL) {
140 u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
141 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
142
143 /* Create data socket, initially just "floating" */
144 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
145 errnosv = errno;
146 if (_gNgDebugLevel >= 1)
147 NGLOG("socket");
148 goto errout;
149 }
150
151 /* Associate the data socket with the node */
152 snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
153 sg->sg_family = AF_NETGRAPH;
154 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
155 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
156 errnosv = errno;
157 if (_gNgDebugLevel >= 1)
158 NGLOG("connect(%s)", sg->sg_data);
159 goto errout;
160 }
161 }
162
163 /* Return the socket(s) */
164 if (csp)
165 *csp = cs;
166 else
167 close(cs);
168 if (dsp)
169 *dsp = ds;
170 return (0);
171
172 errout:
173 /* Failed */
174 if (cs >= 0)
175 close(cs);
176 if (ds >= 0)
177 close(ds);
178 errno = errnosv;
179 return (-1);
180 }
181
182 /*
183 * Assign a globally unique name to a node
184 * Returns -1 if error and sets errno.
185 */
186 int
NgNameNode(int cs,const char * path,const char * fmt,...)187 NgNameNode(int cs, const char *path, const char *fmt, ...)
188 {
189 struct ngm_name ngn;
190 va_list args;
191
192 /* Build message arg */
193 va_start(args, fmt);
194 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
195 va_end(args);
196
197 /* Send message */
198 if (NgSendMsg(cs, path,
199 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
200 if (_gNgDebugLevel >= 1)
201 NGLOGX("%s: failed", __func__);
202 return (-1);
203 }
204
205 /* Done */
206 return (0);
207 }
208
209 /*
210 * Read a packet from a data socket
211 * Returns -1 if error and sets errno.
212 */
213 int
NgRecvData(int ds,u_char * buf,size_t len,char * hook)214 NgRecvData(int ds, u_char * buf, size_t len, char *hook)
215 {
216 u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
217 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
218 socklen_t fromlen = sizeof(frombuf);
219 int rtn, errnosv;
220
221 /* Read packet */
222 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
223 if (rtn < 0) {
224 errnosv = errno;
225 if (_gNgDebugLevel >= 1)
226 NGLOG("recvfrom");
227 errno = errnosv;
228 return (-1);
229 }
230
231 /* Copy hook name */
232 if (hook != NULL)
233 strlcpy(hook, from->sg_data, NG_HOOKSIZ);
234
235 /* Debugging */
236 if (_gNgDebugLevel >= 2) {
237 NGLOGX("READ %s from hook \"%s\" (%d bytes)",
238 rtn ? "PACKET" : "EOF", from->sg_data, rtn);
239 if (_gNgDebugLevel >= 3)
240 _NgDebugBytes(buf, rtn);
241 }
242
243 /* Done */
244 return (rtn);
245 }
246
247 /*
248 * Identical to NgRecvData() except buffer is dynamically allocated.
249 */
250 int
NgAllocRecvData(int ds,u_char ** buf,char * hook)251 NgAllocRecvData(int ds, u_char **buf, char *hook)
252 {
253 int len;
254 socklen_t optlen;
255
256 optlen = sizeof(len);
257 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
258 (*buf = malloc(len)) == NULL)
259 return (-1);
260 if ((len = NgRecvData(ds, *buf, len, hook)) < 0)
261 free(*buf);
262 return (len);
263 }
264
265 /*
266 * Write a packet to a data socket. The packet will be sent
267 * out the corresponding node on the specified hook.
268 * Returns -1 if error and sets errno.
269 */
270 int
NgSendData(int ds,const char * hook,const u_char * buf,size_t len)271 NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
272 {
273 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
274 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
275 int errnosv;
276
277 /* Set up destination hook */
278 sg->sg_family = AF_NETGRAPH;
279 strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
280 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
281
282 /* Debugging */
283 if (_gNgDebugLevel >= 2) {
284 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
285 _NgDebugSockaddr(sg);
286 if (_gNgDebugLevel >= 3)
287 _NgDebugBytes(buf, len);
288 }
289
290 /* Send packet */
291 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
292 errnosv = errno;
293 if (_gNgDebugLevel >= 1)
294 NGLOG("sendto(%s)", sg->sg_data);
295 errno = errnosv;
296 return (-1);
297 }
298
299 /* Done */
300 return (0);
301 }
302
303