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Implement two command line options that allow one to change the

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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.
This commit is contained in:
Hartmut Brandt 2003-08-13 07:42:07 +00:00
parent de244df7c9
commit 1cdff5c9f7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=118858
2 changed files with 23 additions and 8 deletions
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25
usr.sbin/nghook/main.c
View File

@ -61,6 +61,9 @@
static void WriteAscii(u_char * buf, int len);
static void Usage(void);
static int outfd = STDOUT_FILENO;
static int infd = STDIN_FILENO;
/*
* main()
*/
@ -76,7 +79,7 @@ main(int ac, char *av[])
int ch;
/* Parse flags */
while ((ch = getopt(ac, av, "adln")) != EOF) {
while ((ch = getopt(ac, av, "adlnsS")) != EOF) {
switch (ch) {
case 'a':
asciiFlag = 1;
@ -90,6 +93,12 @@ main(int ac, char *av[])
case 'n':
noInput = 1;
break;
case 's':
outfd = STDIN_FILENO;
break;
case 'S':
infd = STDOUT_FILENO;
break;
case '?':
default:
Usage();
@ -134,7 +143,7 @@ main(int ac, char *av[])
/* Setup bits */
FD_ZERO(&rfds);
if (!noInput)
FD_SET(0, &rfds);
FD_SET(infd, &rfds);
FD_SET(dsock, &rfds);
/* Wait for something to happen */
@ -156,7 +165,7 @@ main(int ac, char *av[])
/* Write packet to stdout */
if (asciiFlag)
WriteAscii((u_char *) buf, rl);
else if ((wl = write(STDOUT_FILENO, buf, rl)) != rl) {
else if ((wl = write(outfd, buf, rl)) != rl) {
if (wl < 0) {
err(EX_OSERR, "write(stdout)");
} else {
@ -173,12 +182,12 @@ main(int ac, char *av[])
}
/* Check data from stdin */
if (FD_ISSET(0, &rfds)) {
if (FD_ISSET(infd, &rfds)) {
char buf[BUF_SIZE];
int rl;
/* Read packet from stdin */
if ((rl = read(0, buf, sizeof(buf))) < 0)
if ((rl = read(infd, buf, sizeof(buf))) < 0)
err(EX_OSERR, "read(stdin)");
if (rl == 0)
errx(EX_OSERR, "EOF(stdin)");
@ -221,10 +230,10 @@ WriteAscii(u_char *buf, int len)
sizeof(sbuf) - strlen(sbuf), " ");
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), "\n");
(void) write(STDOUT_FILENO, sbuf, strlen(sbuf));
(void) write(outfd, sbuf, strlen(sbuf));
}
ch = '\n';
write(1, &ch, 1);
write(outfd, &ch, 1);
}
/*
@ -233,6 +242,6 @@ WriteAscii(u_char *buf, int len)
static void
Usage(void)
{
errx(EX_USAGE, "usage: nghook [-adln] path [hookname]");
errx(EX_USAGE, "usage: nghook [-adlnsS] path [hookname]");
}

6
usr.sbin/nghook/nghook.8
View File

@ -43,10 +43,12 @@
node
.Sh SYNOPSIS
.Nm
.Op Fl S
.Op Fl a
.Op Fl d
.Op Fl l
.Op Fl n
.Op Fl s
.Ar path
.Op Ar hookname
.Sh DESCRIPTION
@ -76,6 +78,8 @@ is detected on standard input.
The options are as follows:
.Pp
.Bl -tag -width indent
.It Fl S
Use file descriptor 0 for output instead of the default 1.
.It Fl a
Output each packet read in human-readable decoded
.Tn ASCII
@ -90,6 +94,8 @@ Don't attempt to read any data from standard input.
The
.Nm
utility will continue reading from the node until stopped by a signal.
.It Fl s
Use file descriptor 1 for input instead of the default 0.
.El
.Sh BUGS
Although all input is read in unbuffered mode,