1 /* 2 * write.c 3 * 4 * Copyright (c) 2002 Archie L. Cobbs 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 Archie L. Cobbs; 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 13 * 14 * THIS SOFTWARE IS BEING PROVIDED BY ARCHIE L. COBBS AS IS", AND TO 15 * THE MAXIMUM EXTENT PERMITTED BY LAW, ARCHIE L. COBBS MAKES NO 16 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 17 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 19 * ARCHIE L. COBBS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 20 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 21 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 22 * IN NO EVENT SHALL ARCHIE L. COBBS BE LIABLE FOR ANY DAMAGES 23 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 24 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 25 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 26 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ARCHIE L. COBBS IS ADVISED OF THE POSSIBILITY 30 * OF SUCH DAMAGE. 31 * 32 * $FreeBSD: src/usr.sbin/ngctl/write.c,v 1.1.2.1 2002/02/01 18:17:43 archie Exp $ 33 * $DragonFly: src/usr.sbin/ngctl/write.c,v 1.4 2005/03/16 05:19:11 joerg Exp $ 34 */ 35 36 #include "ngctl.h" 37 38 #define BUF_SIZE 8192 39 40 static int WriteCmd(int ac, const char **av); 41 42 const struct ngcmd write_cmd = { 43 WriteCmd, 44 "write hook < -f file | byte ... >", 45 "Send a data packet down the hook named by \"hook\".", 46 "The data may be contained in a file, or may be described directly" 47 " on the command line by supplying a sequence of bytes.", 48 { "w" } 49 }; 50 51 static int 52 WriteCmd(int ac, const char **av) 53 { 54 uint32_t sagbuf[64]; 55 struct sockaddr_ng *sag = (struct sockaddr_ng *)sagbuf; 56 u_char buf[BUF_SIZE]; 57 const char *hook; 58 FILE *fp; 59 u_int len; 60 int byte; 61 int i; 62 63 /* Get arguments */ 64 if (ac < 3) 65 return(CMDRTN_USAGE); 66 hook = av[1]; 67 68 /* Get data */ 69 if (strcmp(av[2], "-f") == 0) { 70 if (ac != 4) 71 return(CMDRTN_USAGE); 72 if ((fp = fopen(av[3], "r")) == NULL) { 73 warn("can't read file \"%s\"", av[3]); 74 return(CMDRTN_ERROR); 75 } 76 if ((len = fread(buf, 1, sizeof(buf), fp)) == 0) { 77 if (ferror(fp)) 78 warn("can't read file \"%s\"", av[3]); 79 else 80 warnx("file \"%s\" is empty", av[3]); 81 fclose(fp); 82 return(CMDRTN_ERROR); 83 } 84 fclose(fp); 85 } else { 86 for (i = 2, len = 0; i < ac && len < sizeof(buf); i++, len++) { 87 if (sscanf(av[i], "%i", &byte) != 1 88 || (byte < -128 || byte > 255)) { 89 warnx("invalid byte \"%s\"", av[i]); 90 return(CMDRTN_ERROR); 91 } 92 buf[len] = (u_char)byte; 93 } 94 if (len == 0) 95 return(CMDRTN_USAGE); 96 } 97 98 /* Send data */ 99 sag->sg_len = 3 + strlen(hook); 100 sag->sg_family = AF_NETGRAPH; 101 strlcpy(sag->sg_data, hook, sizeof(sagbuf) - 2); 102 if (sendto(dsock, buf, len, 103 0, (struct sockaddr *)sag, sag->sg_len) == -1) { 104 warn("writing to hook \"%s\"", hook); 105 return(CMDRTN_ERROR); 106 } 107 108 /* Done */ 109 return(CMDRTN_OK); 110 } 111