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#include <u.h>
#include <libc.h>
typedef ulong uint32_t;
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
};
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). */
};
char*
xscmd(int fd, enum xsd_sockmsg_type cmd, char *s, char *val)
{
static char buf[512];
struct xsd_sockmsg *msg;
char *arg;
static ulong reqid = 1;
int n;
msg = (struct xsd_sockmsg*)buf;
arg = buf + sizeof(*msg);
if(cmd != XS_WATCH_EVENT){
msg->type = cmd;
msg->req_id = reqid++;
msg->tx_id = 0;
msg->len = strlen(s)+1;
if (val != 0) {
msg->len += strlen(val);
if (msg->type == XS_WATCH)
msg->len++;
}
strcpy(arg, s);
if (val != 0)
strcpy(arg+strlen(s)+1, val);
if (write(fd, buf, sizeof(*msg)+msg->len) < 0)
sysfatal("write: %r");
}
if ((n = read(fd, buf, sizeof(*msg))) != sizeof(*msg))
sysfatal("read hdr %d: %r", n);
fprint(2, "type %lud req_id %lud len %lud\n", msg->type, msg->req_id, msg->len);
if ((n = read(fd, arg, msg->len)) != msg->len)
sysfatal("read data %d: %r", n);
if (cmd == XS_DIRECTORY || cmd == XS_WATCH_EVENT) {
for (s = arg; s < arg+msg->len; s++) {
if (*s == 0) *s = ',';
else if (*s < 32) *s += '0';
}
}
arg[msg->len] = 0;
return arg;
}
void
usage(void)
{
sysfatal("Usage: xenstore [lrwdme] path [value]\n");
}
void
main(int argc, char *argv[])
{
int fd;
if (argc != 3 && argc != 4)
usage();
if(access("/dev/xenstore", AEXIST) < 0)
bind("#x", "/dev", MAFTER);
fd = open("/dev/xenstore", ORDWR);
if (fd < 0)
sysfatal("/dev/xenstore: %r");
switch (argv[1][0]) {
default:
usage();
break;
case 'r':
print("%s\n", xscmd(fd, XS_READ, argv[2], 0));
break;
case 'l':
print("%s\n", xscmd(fd, XS_DIRECTORY, argv[2], 0));
break;
case 'm':
print("%s\n", xscmd(fd, XS_MKDIR, argv[2], 0));
break;
case 'd':
print("%s\n", xscmd(fd, XS_RM, argv[2], 0));
break;
case 'w':
if (argc != 4)
usage();
print("%s\n", xscmd(fd, XS_WRITE, argv[2], argv[3]));
break;
case 'e':
if (argc != 4)
usage();
print("%s\n", xscmd(fd, XS_WATCH, argv[2], argv[3]));
close(fd);
fd = open("/dev/xenwatch", OREAD);
if (fd < 0)
sysfatal("/dev/xenwatch: %r");
for (;;)
print("%s\n", xscmd(fd, XS_WATCH_EVENT, 0, 0));
}
}
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