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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <getopt.h>
#include <netdb.h>
static void xwrite (int sock, const void *buf, size_t len);
static void usage (void);
/* Also in guestfs.c */
#define VMCHANNEL_PORT "6666"
#define VMCHANNEL_ADDR "10.0.2.4"
int
main (int argc, char *argv[])
{
static const char *options = "fh:p:?";
static struct option long_options[] = {
{ "foreground", 0, 0, 'f' },
{ "help", 0, 0, '?' },
{ "host", 1, 0, 'h' },
{ "port", 1, 0, 'p' },
{ 0, 0, 0, 0 }
};
int c, n, r;
int dont_fork = 0;
const char *host = NULL;
const char *port = NULL;
FILE *fp;
char buf[4096];
char *p, *p2;
int sock;
struct addrinfo *res, *rr;
struct addrinfo hints;
XDR xdr;
unsigned len;
for (;;) {
c = getopt_long (argc, argv, options, long_options, NULL);
if (c == -1) break;
switch (c) {
case 'f':
dont_fork = 1;
break;
case 'h':
host = optarg;
break;
case 'p':
port = optarg;
break;
case '?':
usage ();
exit (0);
default:
fprintf (stderr, "guestfsd: unexpected command line option 0x%x\n", c);
exit (1);
}
}
if (optind < argc) {
usage ();
exit (1);
}
/* If host and port aren't set yet, try /proc/cmdline. */
if (!host || !port) {
fp = fopen ("/proc/cmdline", "r");
if (fp == NULL) {
perror ("/proc/cmdline");
goto next;
}
n = fread (buf, 1, sizeof buf - 1, fp);
fclose (fp);
buf[n] = '\0';
p = strstr (buf, "guestfs=");
if (p) {
p += 8;
p2 = strchr (p, ':');
if (p2) {
*p2++ = '\0';
host = p;
r = strcspn (p2, " \n");
p2[r] = '\0';
port = p2;
}
}
}
next:
/* Can't parse /proc/cmdline, so use built-in defaults. */
if (!host || !port) {
host = VMCHANNEL_ADDR;
port = VMCHANNEL_PORT;
}
/* Resolve the hostname. */
memset (&hints, 0, sizeof hints);
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_ADDRCONFIG;
r = getaddrinfo (host, port, &hints, &res);
if (r != 0) {
fprintf (stderr, "%s:%s: %s\n", host, port, gai_strerror (r));
exit (1);
}
/* Connect to the given TCP socket. */
sock = -1;
for (rr = res; rr != NULL; rr = rr->ai_next) {
sock = socket (rr->ai_family, rr->ai_socktype, rr->ai_protocol);
if (sock != -1) {
if (connect (sock, rr->ai_addr, rr->ai_addrlen) == 0)
break;
perror ("connect");
close (sock);
sock = -1;
}
}
freeaddrinfo (res);
if (sock == -1) {
fprintf (stderr, "connection to %s:%s failed\n", host, port);
exit (1);
}
/* Send the magic length message which indicates that
* userspace is up inside the guest.
*/
len = 0xf5f55ff5;
xdrmem_create (&xdr, buf, sizeof buf, XDR_ENCODE);
if (!xdr_uint32_t (&xdr, &len)) {
fprintf (stderr, "xdr_uint32_t failed\n");
exit (1);
}
xwrite (sock, buf, xdr_getpos (&xdr));
xdr_destroy (&xdr);
/* XXX Fork into the background. */
sleep (1000000);
exit (0);
}
static void
xwrite (int sock, const void *buf, size_t len)
{
int r;
while (len > 0) {
r = write (sock, buf, len);
if (r == -1) {
perror ("write");
exit (1);
}
buf += r;
len -= r;
}
}
static void
usage (void)
{
fprintf (stderr, "guestfsd [-f] [-h host -p port]\n");
}
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