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 if (errno == EAFNOSUPPORT) {
78 if (kldload(NG_SOCKET_KLD) < 0) {
79 errnosv = errno;
80 if (_gNgDebugLevel >= 1)
81 NGLOG("can't load %s", NG_SOCKET_KLD);
82 goto errout;
83 }
84 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL);
85 if (cs >= 0)
86 goto gotNode;
87 }
88 errnosv = errno;
89 if (_gNgDebugLevel >= 1)
90 NGLOG("socket");
91 goto errout;
92 }
93
94 gotNode:
95 /* Assign the node the desired name, if any */
96 if (name != NULL) {
97 u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
98 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
99
100 /* Assign name */
101 strlcpy(sg->sg_data, name, NG_NODESIZ);
102 sg->sg_family = AF_NETGRAPH;
103 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
104 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
105 errnosv = errno;
106 if (_gNgDebugLevel >= 1)
107 NGLOG("bind(%s)", sg->sg_data);
108 goto errout;
109 }
110
111 /* Save node name */
112 strlcpy(namebuf, name, sizeof(namebuf));
113 } else if (dsp != NULL) {
114 union {
115 u_char rbuf[sizeof(struct ng_mesg) +
116 sizeof(struct nodeinfo)];
117 struct ng_mesg res;
118 } res;
119 struct nodeinfo *const ni = (struct nodeinfo *) res.res.data;
120
121 /* Find out the node ID */
122 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
123 NGM_NODEINFO, NULL, 0) < 0) {
124 errnosv = errno;
125 if (_gNgDebugLevel >= 1)
126 NGLOG("send nodeinfo");
127 goto errout;
128 }
129 if (NgRecvMsg(cs, &res.res, sizeof(res.rbuf), NULL) < 0) {
130 errnosv = errno;
131 if (_gNgDebugLevel >= 1)
132 NGLOG("recv nodeinfo");
133 goto errout;
134 }
135
136 /* Save node "name" */
137 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
138 }
139
140 /* Create data socket if desired */
141 if (dsp != NULL) {
142 u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
143 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
144
145 /* Create data socket, initially just "floating" */
146 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
147 errnosv = errno;
148 if (_gNgDebugLevel >= 1)
149 NGLOG("socket");
150 goto errout;
151 }
152
153 /* Associate the data socket with the node */
154 snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
155 sg->sg_family = AF_NETGRAPH;
156 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
157 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
158 errnosv = errno;
159 if (_gNgDebugLevel >= 1)
160 NGLOG("connect(%s)", sg->sg_data);
161 goto errout;
162 }
163 }
164
165 /* Return the socket(s) */
166 if (csp)
167 *csp = cs;
168 else
169 close(cs);
170 if (dsp)
171 *dsp = ds;
172 return (0);
173
174 errout:
175 /* Failed */
176 if (cs >= 0)
177 close(cs);
178 if (ds >= 0)
179 close(ds);
180 errno = errnosv;
181 return (-1);
182 }
183
184 /*
185 * Assign a globally unique name to a node
186 * Returns -1 if error and sets errno.
187 */
188 int
NgNameNode(int cs,const char * path,const char * fmt,...)189 NgNameNode(int cs, const char *path, const char *fmt, ...)
190 {
191 struct ngm_name ngn;
192 va_list args;
193
194 /* Build message arg */
195 va_start(args, fmt);
196 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
197 va_end(args);
198
199 /* Send message */
200 if (NgSendMsg(cs, path,
201 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
202 if (_gNgDebugLevel >= 1)
203 NGLOGX("%s: failed", __func__);
204 return (-1);
205 }
206
207 /* Done */
208 return (0);
209 }
210
211 /*
212 * Read a packet from a data socket
213 * Returns -1 if error and sets errno.
214 */
215 int
NgRecvData(int ds,u_char * buf,size_t len,char * hook)216 NgRecvData(int ds, u_char * buf, size_t len, char *hook)
217 {
218 u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
219 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
220 socklen_t fromlen = sizeof(frombuf);
221 int rtn, errnosv;
222
223 /* Read packet */
224 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
225 if (rtn < 0) {
226 errnosv = errno;
227 if (_gNgDebugLevel >= 1)
228 NGLOG("recvfrom");
229 errno = errnosv;
230 return (-1);
231 }
232
233 /* Copy hook name */
234 if (hook != NULL)
235 strlcpy(hook, from->sg_data, NG_HOOKSIZ);
236
237 /* Debugging */
238 if (_gNgDebugLevel >= 2) {
239 NGLOGX("READ %s from hook \"%s\" (%d bytes)",
240 rtn ? "PACKET" : "EOF", from->sg_data, rtn);
241 if (_gNgDebugLevel >= 3)
242 _NgDebugBytes(buf, rtn);
243 }
244
245 /* Done */
246 return (rtn);
247 }
248
249 /*
250 * Identical to NgRecvData() except buffer is dynamically allocated.
251 */
252 int
NgAllocRecvData(int ds,u_char ** buf,char * hook)253 NgAllocRecvData(int ds, u_char **buf, char *hook)
254 {
255 int len;
256 socklen_t optlen;
257
258 optlen = sizeof(len);
259 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
260 (*buf = malloc(len)) == NULL)
261 return (-1);
262 if ((len = NgRecvData(ds, *buf, len, hook)) < 0)
263 free(*buf);
264 return (len);
265 }
266
267 /*
268 * Write a packet to a data socket. The packet will be sent
269 * out the corresponding node on the specified hook.
270 * Returns -1 if error and sets errno.
271 */
272 int
NgSendData(int ds,const char * hook,const u_char * buf,size_t len)273 NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
274 {
275 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
276 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
277 int errnosv;
278
279 /* Set up destination hook */
280 sg->sg_family = AF_NETGRAPH;
281 strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
282 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
283
284 /* Debugging */
285 if (_gNgDebugLevel >= 2) {
286 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
287 _NgDebugSockaddr(sg);
288 if (_gNgDebugLevel >= 3)
289 _NgDebugBytes(buf, len);
290 }
291
292 /* Send packet */
293 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
294 errnosv = errno;
295 if (_gNgDebugLevel >= 1)
296 NGLOG("sendto(%s)", sg->sg_data);
297 errno = errnosv;
298 return (-1);
299 }
300
301 /* Done */
302 return (0);
303 }
304
305