usr.sbin/ngctl/write.c

   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 }