1 2 /* 3 * write.c 4 * 5 * Copyright (c) 2002 Archie L. Cobbs 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 Archie L. Cobbs; 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 14 * 15 * THIS SOFTWARE IS BEING PROVIDED BY ARCHIE L. COBBS AS IS", AND TO 16 * THE MAXIMUM EXTENT PERMITTED BY LAW, ARCHIE L. COBBS MAKES NO 17 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 18 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 20 * ARCHIE L. COBBS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 21 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 22 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 23 * IN NO EVENT SHALL ARCHIE L. COBBS BE LIABLE FOR ANY DAMAGES 24 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 25 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 27 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ARCHIE L. COBBS IS ADVISED OF THE POSSIBILITY 31 * OF SUCH DAMAGE. 32 * 33 * $FreeBSD$ 34 */ 35 36 #include <sys/types.h> 37 #include <sys/socket.h> 38 39 #include <err.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include <netgraph/ng_socket.h> 45 46 #include "ngctl.h" 47 48 #define BUF_SIZE 8192 49 50 static int WriteCmd(int ac, char **av); 51 52 const struct ngcmd write_cmd = { 53 WriteCmd, 54 "write hook < -f file | byte ... >", 55 "Send a data packet down the hook named by \"hook\".", 56 "The data may be contained in a file, or may be described directly" 57 " on the command line by supplying a sequence of bytes.", 58 { "w" } 59 }; 60 61 static int 62 WriteCmd(int ac, char **av) 63 { 64 u_int32_t sagbuf[64]; 65 struct sockaddr_ng *sag = (struct sockaddr_ng *)sagbuf; 66 u_char buf[BUF_SIZE]; 67 const char *hook; 68 FILE *fp; 69 u_int len; 70 int byte; 71 int i; 72 73 /* Get arguments */ 74 if (ac < 3) 75 return (CMDRTN_USAGE); 76 hook = av[1]; 77 78 /* Get data */ 79 if (strcmp(av[2], "-f") == 0) { 80 if (ac != 4) 81 return (CMDRTN_USAGE); 82 if ((fp = fopen(av[3], "r")) == NULL) { 83 warn("can't read file \"%s\"", av[3]); 84 return (CMDRTN_ERROR); 85 } 86 if ((len = fread(buf, 1, sizeof(buf), fp)) == 0) { 87 if (ferror(fp)) 88 warn("can't read file \"%s\"", av[3]); 89 else 90 warnx("file \"%s\" is empty", av[3]); 91 fclose(fp); 92 return (CMDRTN_ERROR); 93 } 94 fclose(fp); 95 } else { 96 for (i = 2, len = 0; i < ac && len < sizeof(buf); i++, len++) { 97 if (sscanf(av[i], "%i", &byte) != 1 98 || (byte < -128 || byte > 255)) { 99 warnx("invalid byte \"%s\"", av[i]); 100 return (CMDRTN_ERROR); 101 } 102 buf[len] = (u_char)byte; 103 } 104 if (len == 0) 105 return (CMDRTN_USAGE); 106 } 107 108 /* Send data */ 109 sag->sg_len = 3 + strlen(hook); 110 sag->sg_family = AF_NETGRAPH; 111 strlcpy(sag->sg_data, hook, sizeof(sagbuf) - 2); 112 if (sendto(dsock, buf, len, 113 0, (struct sockaddr *)sag, sag->sg_len) == -1) { 114 warn("writing to hook \"%s\"", hook); 115 return (CMDRTN_ERROR); 116 } 117 118 /* Done */ 119 return (CMDRTN_OK); 120 } 121 122