1 files changed, 98 insertions, 0 deletions
diff --git a/ioops.c b/ioops.c
new file mode 100644
index 0000000..1bcb2d7
--- /dev/null
+++ b/ioops.c
@@ -0,0 +1,98 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+
+#include "die.h"
+#include "ioops.h"
+#include "str.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;
+}