#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdint.h>

#include <sys/socket.h>
#include <sys/un.h>

#define SOCKET "/var/run/xenstored/socket"

#define READ_PATH "/"

enum xsd_sockmsg_type
{
    XS_DEBUG,
    XS_DIRECTORY,
    XS_READ,
    XS_GET_PERMS,
    XS_WATCH,
    XS_UNWATCH,
    XS_TRANSACTION_START,
    XS_TRANSACTION_END,
    XS_INTRODUCE,
    XS_RELEASE,
    XS_GET_DOMAIN_PATH,
    XS_WRITE,
    XS_MKDIR,
    XS_RM,
    XS_SET_PERMS,
    XS_WATCH_EVENT,
    XS_ERROR,
    XS_IS_DOMAIN_INTRODUCED,
    XS_RESUME,
    XS_RESTRICT
};

struct xsd_sockmsg
{
    uint32_t type;  /* XS_??? */
    uint32_t req_id;/* Request identifier, echoed in daemon's response.  */
    uint32_t tx_id; /* Transaction id (0 if not related to a transaction). */
    uint32_t len;   /* Length of data following this. */

    /* Generally followed by nul-terminated string(s). */
};

int main(void)
{
	struct sockaddr_un addr;
	int sock, saved_errno, flags;
	struct xsd_sockmsg hdr;

	sock = socket(PF_UNIX, SOCK_STREAM, 0);
	if (sock < 0)
		return -1;

	if ((flags = fcntl(sock, F_GETFD)) < 0)
		goto error;
	flags |= FD_CLOEXEC;
	if (fcntl(sock, F_SETFD, flags) < 0)
		goto error;

	addr.sun_family = AF_UNIX;
	strcpy(addr.sun_path, SOCKET);

	if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) != 0)
		goto error;

	hdr.type = XS_READ;
	hdr.req_id = 1;
	hdr.tx_id = 0;
	hdr.len = strlen(READ_PATH);
	write(sock, &hdr, sizeof(hdr));
	write(sock, READ_PATH, strlen(READ_PATH));

	return 0;
error:
	perror("main");
	abort();
}