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