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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2009, 2010 Daniel Borkmann.
* Subject to the GPL, version 2.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include "die.h"
#include "xio.h"
#include "xutils.h"
int open_or_die(const char *file, int flags)
{
int ret = open(file, flags);
if (ret < 0)
panic("Cannot open file %s! %s.\n", file, strerror(errno));
return ret;
}
int open_or_die_m(const char *file, int flags, mode_t mode)
{
int ret = open(file, flags, mode);
if (ret < 0)
panic("Cannot open or create file %s! %s.", file, strerror(errno));
return ret;
}
void create_or_die(const char *file, mode_t mode)
{
int fd = open_or_die_m(file, O_WRONLY | O_CREAT, mode);
close(fd);
}
void pipe_or_die(int pipefd[2], int flags)
{
int ret = pipe2(pipefd, flags);
if (ret < 0)
panic("Cannot create pipe2 event fd! %s.\n", strerror(errno));
}
int tun_open_or_die(char *name, int type)
{
int fd, ret;
short flags;
struct ifreq ifr;
if (!name)
panic("No name provided for tundev!\n");
fd = open_or_die("/dev/net/tun", O_RDWR);
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = type;
strlcpy(ifr.ifr_name, name, IFNAMSIZ);
ret = ioctl(fd, TUNSETIFF, &ifr);
if (ret < 0)
panic("ioctl screwed up! %s.\n", strerror(errno));
ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
if (ret < 0)
panic("fctnl screwed up! %s.\n", strerror(errno));
flags = device_get_flags(name);
flags |= IFF_UP | IFF_RUNNING;
device_set_flags(name, flags);
return fd;
}
ssize_t read_or_die(int fd, void *buf, size_t len)
{
ssize_t ret = read(fd, buf, len);
if (ret < 0) {
if (errno == EPIPE)
die();
panic("Cannot read from descriptor! %s.\n", strerror(errno));
}
return ret;
}
ssize_t write_or_die(int fd, const void *buf, size_t len)
{
ssize_t ret = write(fd, buf, len);
if (ret < 0) {
if (errno == EPIPE)
die();
panic("Cannot write to descriptor! %s.", strerror(errno));
}
return ret;
}
extern volatile sig_atomic_t sigint;
ssize_t read_exact(int fd, void *buf, size_t len, int mayexit)
{
ssize_t num = 0, written;
while (len > 0 && !sigint) {
if ((written = read(fd, buf, len)) < 0) {
if (errno == EAGAIN && num > 0)
continue;
if (mayexit)
return -1;
else
continue;
}
if (!written)
return 0;
len -= written;
buf += written;
num += written;
}
return num;
}
ssize_t write_exact(int fd, void *buf, size_t len, int mayexit)
{
ssize_t num = 0, written;
while (len > 0 && !sigint) {
if ((written = write(fd, buf, len)) < 0) {
if (errno == EAGAIN && num > 0)
continue;
if (mayexit)
return -1;
else
continue;
}
if (!written)
return 0;
len -= written;
buf += written;
num += written;
}
return num;
}
static int fd_rnd = -1;
static void randombytes(unsigned char *x, unsigned long long xlen)
{
int ret;
if (fd_rnd == -1) {
for (;;) {
fd_rnd = open("/dev/urandom", O_RDONLY);
if (fd_rnd != -1)
break;
sleep(1);
}
}
while (xlen > 0) {
if (xlen < 1048576)
ret = xlen;
else
ret = 1048576;
ret = read(fd_rnd, x, ret);
if (ret < 1) {
sleep(1);
continue;
}
x += ret;
xlen -= ret;
}
}
/* Note: it's not really secure, but the name only suggests it's better to use
* than rand(3) when transferring bytes over the network in non-security
* critical structure members. secrand() is only used to fill up salts actually.
*/
int secrand(void)
{
int ret;
randombytes((void *) &ret, sizeof(ret));
return ret;
}
static char const *priov[] = {
[LOG_EMERG] = "EMERG:",
[LOG_ALERT] = "ALERT:",
[LOG_CRIT] = "CRIT:",
[LOG_ERR] = "ERR:",
[LOG_WARNING] = "WARNING:",
[LOG_NOTICE] = "NOTICE:",
[LOG_INFO] = "INFO:",
[LOG_DEBUG] = "DEBUG:",
};
static ssize_t cookie_writer(void *cookie, char const *data, size_t leng)
{
int prio = LOG_DEBUG, len;
do {
len = strlen(priov[prio]);
} while (memcmp(data, priov[prio], len) && --prio >= 0);
if (prio < 0) {
prio = LOG_INFO;
} else {
data += len;
leng -= len;
}
while (*data == ' ') {
++data;
--leng;
}
syslog(prio, "%.*s", (int) leng, data);
return leng;
}
static cookie_io_functions_t cookie_log = {
.write = cookie_writer,
};
void to_std_log(FILE **fp)
{
setvbuf(*fp = fopencookie(NULL, "w", cookie_log), NULL, _IOLBF, 0);
}
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