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 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 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