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/*
* icmp.c
*
* Copyright (c) 2001 Dug Song <[email protected]>
*
* $Id$
*/
#include "config.h"
#include <sys/types.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dumbnet.h"
#include "aton.h"
#include "mod.h"
void
icmp_usage(void)
{
fprintf(stderr, "Usage: dnet icmp [type|code <value>] ...\n");
exit(1);
}
int
icmp_main(int argc, char *argv[])
{
struct icmp_hdr *icmp;
u_char *p, buf[IP_LEN_MAX]; /* XXX */
char *name, *value;
int c, len;
icmp = (struct icmp_hdr *)buf;
memset(icmp, 0, sizeof(*icmp));
icmp->icmp_type = ICMP_ECHO;
icmp->icmp_code = 0;
for (c = 1; c 1 < argc; c = 2) {
name = argv[c];
value = argv[c 1];
if (strcmp(name, "type") == 0) {
icmp->icmp_type = atoi(value);
} else if (strcmp(name, "code") == 0) {
icmp->icmp_code = atoi(value);
} else
icmp_usage();
}
argc -= c;
argv = c;
if (argc != 0)
icmp_usage();
p = buf ICMP_HDR_LEN;
if (!isatty(STDIN_FILENO)) {
len = sizeof(buf) - (p - buf);
while ((c = read(STDIN_FILENO, p, len)) > 0) {
p = c;
len -= c;
}
}
len = p - buf;
if (write(STDOUT_FILENO, buf, len) != len)
err(1, "write");
return (0);
}
struct mod mod_icmp = {
"icmp",
MOD_TYPE_ENCAP,
icmp_main
};
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