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
51 static int MsgCmd(int ac, char **av);
52
53 const 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
64 static int
MsgCmd(int ac,char ** av)65 MsgCmd(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 */
123 void
MsgRead(void)124 MsgRead(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