all: import netsniff-ng 0.5.8-rc0 source

We decided to get rid of the old Git history and start a new one for
several reasons:

 *) Allow / enforce only high-quality commits (which was not the case
    for many commits in the history), have a policy that is more close
    to the one from the Linux kernel. With high quality commits, we
    mean code that is logically split into commits and commit messages
    that are signed-off and have a proper subject and message body.
    We do not allow automatic Github merges anymore, since they are
    total bullshit. However, we will either cherry-pick your patches
    or pull them manually.

 *) The old archive was about ~27MB for no particular good reason.
    This basically derived from the bad decision that also some PDF
    files where stored there. From this moment onwards, no binary
    objects are allowed to be stored in this repository anymore.

The old archive is not wiped away from the Internet. You will still
be able to find it, e.g. on git.cryptoism.org etc.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 248 insertions, 0 deletions

diff --git a/xio.c b/xio.c
new file mode 100644
index 0000000..d2c6181
--- /dev/null
+++ b/xio.c
@@ -0,0 +1,248 @@
+/*
+ * 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);
+}