1cdff5c9f7
file descriptors that are used for input and output. That allows one, for example, to use nghook to bi-directionally pipe the input and output into/from another non-netgraph-aware program.
248 lines
6.2 KiB
C
248 lines
6.2 KiB
C
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/*
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* main.c
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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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 Whistle Communications;
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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; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS 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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* WHISTLE COMMUNICATIONS 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 WHISTLE COMMUNICATIONS 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 WHISTLE COMMUNICATIONS 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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* $Whistle: main.c,v 1.9 1999/01/20 00:26:26 archie Exp $
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <sysexits.h>
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#include <errno.h>
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#include <err.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <netgraph.h>
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#define DEFAULT_HOOKNAME "debug"
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#define NG_SOCK_HOOK_NAME "hook"
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#define BUF_SIZE (64 * 1024)
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static void WriteAscii(u_char * buf, int len);
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static void Usage(void);
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static int outfd = STDOUT_FILENO;
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static int infd = STDIN_FILENO;
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/*
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* main()
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*/
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int
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main(int ac, char *av[])
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{
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struct ngm_connect ngc;
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char *path = NULL, *hook = DEFAULT_HOOKNAME;
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int csock, dsock;
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int asciiFlag = 0;
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int loopFlag = 0;
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int noInput = 0;
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int ch;
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/* Parse flags */
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while ((ch = getopt(ac, av, "adlnsS")) != EOF) {
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switch (ch) {
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case 'a':
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asciiFlag = 1;
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break;
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case 'd':
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NgSetDebug(NgSetDebug(-1) + 1);
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break;
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case 'l':
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loopFlag = 1;
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break;
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case 'n':
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noInput = 1;
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break;
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case 's':
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outfd = STDIN_FILENO;
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break;
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case 'S':
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infd = STDOUT_FILENO;
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break;
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case '?':
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default:
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Usage();
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}
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}
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ac -= optind;
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av += optind;
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/* Get params */
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switch (ac) {
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case 2:
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hook = av[1];
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/* FALLTHROUGH */
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case 1:
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path = av[0];
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break;
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default:
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Usage();
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}
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/* Get sockets */
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if (NgMkSockNode(NULL, &csock, &dsock) < 0)
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errx(EX_OSERR, "can't get sockets");
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/* Connect socket node to specified node */
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snprintf(ngc.path, sizeof(ngc.path), "%s", path);
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snprintf(ngc.ourhook, sizeof(ngc.ourhook), NG_SOCK_HOOK_NAME);
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snprintf(ngc.peerhook, sizeof(ngc.peerhook), "%s", hook);
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if (NgSendMsg(csock, ".",
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NGM_GENERIC_COOKIE, NGM_CONNECT, &ngc, sizeof(ngc)) < 0)
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errx(EX_OSERR, "can't connect to node");
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/* Close standard input if not reading from it */
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if (noInput)
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fclose(stdin);
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/* Relay data */
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while (1) {
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fd_set rfds;
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/* Setup bits */
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FD_ZERO(&rfds);
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if (!noInput)
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FD_SET(infd, &rfds);
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FD_SET(dsock, &rfds);
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/* Wait for something to happen */
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if (select(FD_SETSIZE, &rfds, NULL, NULL, NULL) < 0)
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err(EX_OSERR, "select");
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/* Check data from socket */
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if (FD_ISSET(dsock, &rfds)) {
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char buf[BUF_SIZE];
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int rl, wl;
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/* Read packet from socket */
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if ((rl = NgRecvData(dsock,
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buf, sizeof(buf), NULL)) < 0)
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err(EX_OSERR, "read(hook)");
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if (rl == 0)
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errx(EX_OSERR, "read EOF from hook?!");
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/* Write packet to stdout */
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if (asciiFlag)
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WriteAscii((u_char *) buf, rl);
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else if ((wl = write(outfd, buf, rl)) != rl) {
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if (wl < 0) {
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err(EX_OSERR, "write(stdout)");
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} else {
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errx(EX_OSERR,
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"stdout: read %d, wrote %d",
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rl, wl);
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}
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}
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/* Loopback */
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if (loopFlag) {
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if (NgSendData(dsock, NG_SOCK_HOOK_NAME, buf, rl) < 0)
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err(EX_OSERR, "write(hook)");
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}
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}
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/* Check data from stdin */
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if (FD_ISSET(infd, &rfds)) {
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char buf[BUF_SIZE];
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int rl;
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/* Read packet from stdin */
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if ((rl = read(infd, buf, sizeof(buf))) < 0)
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err(EX_OSERR, "read(stdin)");
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if (rl == 0)
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errx(EX_OSERR, "EOF(stdin)");
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/* Write packet to socket */
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if (NgSendData(dsock, NG_SOCK_HOOK_NAME, buf, rl) < 0)
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err(EX_OSERR, "write(hook)");
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}
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}
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}
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/*
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* Dump data in hex and ASCII form
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*/
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static void
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WriteAscii(u_char *buf, int len)
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{
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char ch, sbuf[100];
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int k, count;
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for (count = 0; count < len; count += 16) {
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snprintf(sbuf, sizeof(sbuf), "%04x: ", count);
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for (k = 0; k < 16; k++)
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if (count + k < len)
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snprintf(sbuf + strlen(sbuf),
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sizeof(sbuf) - strlen(sbuf),
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"%02x ", buf[count + k]);
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else
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snprintf(sbuf + strlen(sbuf),
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sizeof(sbuf) - strlen(sbuf), " ");
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snprintf(sbuf + strlen(sbuf), sizeof(sbuf) - strlen(sbuf), " ");
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for (k = 0; k < 16; k++)
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if (count + k < len) {
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ch = isprint(buf[count + k]) ?
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buf[count + k] : '.';
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snprintf(sbuf + strlen(sbuf),
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sizeof(sbuf) - strlen(sbuf), "%c", ch);
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} else
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snprintf(sbuf + strlen(sbuf),
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sizeof(sbuf) - strlen(sbuf), " ");
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snprintf(sbuf + strlen(sbuf),
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sizeof(sbuf) - strlen(sbuf), "\n");
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(void) write(outfd, sbuf, strlen(sbuf));
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}
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ch = '\n';
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write(outfd, &ch, 1);
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}
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/*
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* Display usage and exit
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*/
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static void
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Usage(void)
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{
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errx(EX_USAGE, "usage: nghook [-adlnsS] path [hookname]");
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}
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