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 53 static int MsgCmd(int ac, char **av); 54 55 const 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 66 static int 67 MsgCmd(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 */ 125 void 126 MsgRead(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