1 /*
2 * msg.c
3 *
4 * Copyright (c) 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 * $Whistle: msg.c,v 1.2 1999/11/29 23:38:35 archie Exp $
37 */
38
39 #include <err.h>
40 #include <netgraph.h>
41 #include <poll.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <sysexits.h>
46 #include <unistd.h>
47
48 #include "ngctl.h"
49
50 static int MsgCmd(int ac, char **av);
51
52 const struct ngcmd msg_cmd = {
53 MsgCmd,
54 "msg path command [args ... ]",
55 "Send a netgraph control message to the node at \"path\"",
56 "The msg command constructs a netgraph control message from the"
57 " command name and ASCII arguments (if any) and sends that message"
58 " to the node. It does this by first asking the node to convert"
59 " the ASCII message into binary format, and resending the result.",
60 { "cmd" }
61 };
62
63 static int
MsgCmd(int ac,char ** av)64 MsgCmd(int ac, char **av)
65 {
66 struct pollfd pfds[1] = {
67 { .fd = csock, .events = POLLIN },
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 switch (poll(pfds, 1, 0)) {
101 case -1:
102 err(EX_OSERR, "poll");
103 case 0:
104 break;
105 default:
106 MsgRead();
107 break;
108 }
109
110 /* Done */
111 return (CMDRTN_OK);
112 }
113
114 /*
115 * Read and display the next incoming control message
116 */
117 void
MsgRead(void)118 MsgRead(void)
119 {
120 struct ng_mesg *m, *m2;
121 struct ng_mesg *ascii;
122 char path[NG_PATHSIZ];
123
124 /* Get incoming message (in binary form) */
125 if (NgAllocRecvMsg(csock, &m, path) < 0) {
126 warn("recv incoming message");
127 return;
128 }
129
130 /* Ask originating node to convert message to ASCII */
131 if (NgSendMsg(csock, path, NGM_GENERIC_COOKIE,
132 NGM_BINARY2ASCII, m, sizeof(*m) + m->header.arglen) < 0 ||
133 NgAllocRecvMsg(csock, &m2, NULL) < 0) {
134 printf("Rec'd %s %d from \"%s\":\n",
135 (m->header.flags & NGF_RESP) != 0 ? "response" : "command",
136 m->header.cmd, path);
137 if (m->header.arglen == 0)
138 printf("No arguments\n");
139 else
140 DumpAscii((const u_char *)m->data, m->header.arglen);
141 free(m);
142 return;
143 }
144
145 /* Display message in ASCII form */
146 free(m);
147 ascii = (struct ng_mesg *)m2->data;
148 printf("Rec'd %s \"%s\" (%d) from \"%s\":\n",
149 (ascii->header.flags & NGF_RESP) != 0 ? "response" : "command",
150 ascii->header.cmdstr, ascii->header.cmd, path);
151 if (*ascii->data != '\0')
152 printf("Args:\t%s\n", ascii->data);
153 else
154 printf("No arguments\n");
155 free(m2);
156 }
157