1
2/*
3 * msg.c
4 *
5 * Copyright (c) 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 * $Whistle: msg.c,v 1.2 1999/11/29 23:38:35 archie Exp $
38 */
39
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD$");
42
43#include <err.h>
44#include <netgraph.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <sysexits.h>
49#include <unistd.h>
50
51#include "ngctl.h"
52
53static int MsgCmd(int ac, char **av);
54
55const struct ngcmd msg_cmd = {
56	MsgCmd,
57	"msg path command [args ... ]",
58	"Send a netgraph control message to the node at \"path\"",
59	"The msg command constructs a netgraph control message from the"
60	" command name and ASCII arguments (if any) and sends that message"
61	" to the node.  It does this by first asking the node to convert"
62	" the ASCII message into binary format, and resending the result.",
63	{ "cmd" }
64};
65
66static int
67MsgCmd(int ac, char **av)
68{
69	char *buf;
70	char *path, *cmdstr;
71	int i, len;
72
73	/* Get arguments */
74	if (ac < 3)
75		return (CMDRTN_USAGE);
76	path = av[1];
77	cmdstr = av[2];
78
79	/* Put command and arguments back together as one string */
80	for (len = 1, i = 3; i < ac; i++)
81		len += strlen(av[i]) + 1;
82	if ((buf = malloc(len)) == NULL) {
83		warn("malloc");
84		return (CMDRTN_ERROR);
85	}
86	for (*buf = '\0', i = 3; i < ac; i++) {
87		snprintf(buf + strlen(buf),
88		    len - strlen(buf), " %s", av[i]);
89	}
90
91	/* Send it */
92	if (NgSendAsciiMsg(csock, path, "%s%s", cmdstr, buf) < 0) {
93		free(buf);
94		warn("send msg");
95		return (CMDRTN_ERROR);
96	}
97	free(buf);
98
99	/* See if a synchronous reply awaits */
100	{
101		struct timeval tv;
102		fd_set rfds;
103
104		FD_ZERO(&rfds);
105		FD_SET(csock, &rfds);
106		memset(&tv, 0, sizeof(tv));
107		switch (select(csock + 1, &rfds, NULL, NULL, &tv)) {
108		case -1:
109			err(EX_OSERR, "select");
110		case 0:
111			break;
112		default:
113			MsgRead();
114			break;
115		}
116	}
117
118	/* Done */
119	return (CMDRTN_OK);
120}
121
122/*
123 * Read and display the next incoming control message
124 */
125void
126MsgRead(void)
127{
128	struct ng_mesg *m, *m2;
129	struct ng_mesg *ascii;
130	char path[NG_PATHSIZ];
131
132	/* Get incoming message (in binary form) */
133	if (NgAllocRecvMsg(csock, &m, path) < 0) {
134		warn("recv incoming message");
135		return;
136	}
137
138	/* Ask originating node to convert message to ASCII */
139	if (NgSendMsg(csock, path, NGM_GENERIC_COOKIE,
140	      NGM_BINARY2ASCII, m, sizeof(*m) + m->header.arglen) < 0
141	    || NgAllocRecvMsg(csock, &m2, NULL) < 0) {
142		printf("Rec'd %s %d from \"%s\":\n",
143		    (m->header.flags & NGF_RESP) != 0 ? "response" : "command",
144		    m->header.cmd, path);
145		if (m->header.arglen == 0)
146			printf("No arguments\n");
147		else
148			DumpAscii((const u_char *)m->data, m->header.arglen);
149		free(m);
150		return;
151	}
152
153	/* Display message in ASCII form */
154	free(m);
155	ascii = (struct ng_mesg *)m2->data;
156	printf("Rec'd %s \"%s\" (%d) from \"%s\":\n",
157	    (ascii->header.flags & NGF_RESP) != 0 ? "response" : "command",
158	    ascii->header.cmdstr, ascii->header.cmd, path);
159	if (*ascii->data != '\0')
160		printf("Args:\t%s\n", ascii->data);
161	else
162		printf("No arguments\n");
163	free(m2);
164}
165
166