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122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
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/*
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* write.c
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*
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* Copyright (c) 2002 Archie L. Cobbs
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Archie L. Cobbs;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties
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*
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* THIS SOFTWARE IS BEING PROVIDED BY ARCHIE L. COBBS AS IS", AND TO
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* THE MAXIMUM EXTENT PERMITTED BY LAW, ARCHIE L. COBBS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* ARCHIE L. COBBS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL ARCHIE L. COBBS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ARCHIE L. COBBS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <err.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <netgraph/ng_socket.h>
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#include "ngctl.h"
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#define BUF_SIZE 8192
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static int WriteCmd(int ac, char **av);
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const struct ngcmd write_cmd = {
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WriteCmd,
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"write hook < -f file | byte ... >",
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"Send a data packet down the hook named by \"hook\".",
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"The data may be contained in a file, or may be described directly"
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" on the command line by supplying a sequence of bytes.",
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{ "w" }
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};
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static int
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WriteCmd(int ac, char **av)
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{
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u_int32_t sagbuf[64];
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struct sockaddr_ng *sag = (struct sockaddr_ng *)sagbuf;
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u_char buf[BUF_SIZE];
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const char *hook;
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FILE *fp;
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u_int len;
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int byte;
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int i;
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/* Get arguments */
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if (ac < 3)
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return (CMDRTN_USAGE);
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hook = av[1];
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/* Get data */
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if (strcmp(av[2], "-f") == 0) {
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if (ac != 4)
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return (CMDRTN_USAGE);
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if ((fp = fopen(av[3], "r")) == NULL) {
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warn("can't read file \"%s\"", av[3]);
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return (CMDRTN_ERROR);
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}
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if ((len = fread(buf, 1, sizeof(buf), fp)) == 0) {
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if (ferror(fp))
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warn("can't read file \"%s\"", av[3]);
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else
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warnx("file \"%s\" is empty", av[3]);
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fclose(fp);
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return (CMDRTN_ERROR);
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}
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fclose(fp);
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} else {
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for (i = 2, len = 0; i < ac && len < sizeof(buf); i++, len++) {
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if (sscanf(av[i], "%i", &byte) != 1
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|| (byte < -128 || byte > 255)) {
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warnx("invalid byte \"%s\"", av[i]);
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return (CMDRTN_ERROR);
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}
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buf[len] = (u_char)byte;
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}
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if (len == 0)
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return (CMDRTN_USAGE);
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}
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/* Send data */
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sag->sg_len = 3 + strlen(hook);
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sag->sg_family = AF_NETGRAPH;
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strlcpy(sag->sg_data, hook, sizeof(sagbuf) - 2);
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if (sendto(dsock, buf, len,
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0, (struct sockaddr *)sag, sag->sg_len) == -1) {
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warn("writing to hook \"%s\"", hook);
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return (CMDRTN_ERROR);
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}
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/* Done */
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return (CMDRTN_OK);
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}
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