Commit 9bf05444 authored by bellard's avatar bellard
Browse files

port redirection support

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162
parent a3504c87
......@@ -9,6 +9,7 @@ version 0.6.1:
- VMware 3 and 4 read-only disk image support (untested)
- Support for up to 4 serial ports
- TFTP server support (Magnus Damm)
- Port redirection support in user mode networking
version 0.6.0:
......@@ -228,6 +228,44 @@ example of its use.
Use the user mode network stack. This is the default if no tun/tap
network init script is found.
@item -tftp prefix
When using the user mode network stack, activate a built-in TFTP
server. All filenames beginning with @var{prefix} can be downloaded
from the host to the guest using a TFTP client. The TFTP client on the
guest must be configured in binary mode (use the command @code{bin} of
the Unix TFTP client). The host IP address on the guest is as usual
@item -redir [tcp|udp]:host-port:[guest-host]:guest-port
When using the user mode network stack, redirect incoming TCP or UDP
connections to the host port @var{host-port} to the guest
@var{guest-host} on guest port @var{guest-port}. If @var{guest-host}
is not specified, its value is (default address given by the
built-in DHCP server).
For example, to redirect host X11 connection from screen 1 to guest
screen 0, use the following:
# on the host
qemu -redir tcp:6001::6000 [...]
# this host xterm should open in the guest X11 server
xterm -display :1
@end example
To redirect telnet connections from host port 5555 to telnet port on
the guest, use the following:
# on the host
qemu -redir tcp:5555::23 [...]
telnet localhost 5555
@end example
Then when you use on the host @code{telnet localhost 5555}, you
connect to the guest telnet server.
@item -dummy-net
Use the dummy network stack: no packet will be received by the network
......@@ -652,7 +690,12 @@ Note that @code{ping} is not supported reliably to the internet as it
would require root priviledges. It means you can only ping the local
router (
The user mode network is currently only supported on a Unix host.
When using the built-in TFTP server, the router is also the TFTP
When using the @option{-redir} option, TCP or UDP connections can be
redirected from the host to the guest. It allows for example to
redirect X11, telnet or SSH connections.
@node direct_linux_boot
@section Direct Linux Boot
......@@ -3,8 +3,10 @@
#ifdef _WIN32
#include <winsock2.h>
int inet_aton(const char *cp, struct in_addr *ia);
#include <sys/select.h>
#include <arpa/inet.h>
void slirp_init(void);
......@@ -20,4 +22,9 @@ void slirp_input(const uint8_t *pkt, int pkt_len);
int slirp_can_output(void);
void slirp_output(const uint8_t *pkt, int pkt_len);
int slirp_redir(int is_udp, int host_port,
struct in_addr guest_addr, int guest_port);
extern const char *tftp_prefix;
......@@ -617,3 +617,18 @@ void if_encap(const uint8_t *ip_data, int ip_data_len)
memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
slirp_output(buf, ip_data_len + ETH_HLEN);
int slirp_redir(int is_udp, int host_port,
struct in_addr guest_addr, int guest_port)
if (is_udp) {
if (!udp_listen(htons(host_port), guest_addr.s_addr,
htons(guest_port), 0))
return -1;
} else {
if (!solisten(htons(host_port), guest_addr.s_addr,
htons(guest_port), 0))
return -1;
return 0;
......@@ -36,7 +36,7 @@ struct tftp_session {
struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
char *tftp_prefix;
const char *tftp_prefix;
static void tftp_session_update(struct tftp_session *spt)
......@@ -29,6 +29,4 @@ struct tftp_t {
} x;
extern char *tftp_prefix;
void tftp_input(struct mbuf *m);
......@@ -1382,6 +1382,78 @@ static int net_slirp_init(NetDriverState *nd)
return 0;
static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
const char *p, *p1;
int len;
p = *pp;
p1 = strchr(p, sep);
if (!p1)
return -1;
len = p1 - p;
if (buf_size > 0) {
if (len > buf_size - 1)
len = buf_size - 1;
memcpy(buf, p, len);
buf[len] = '\0';
*pp = p1;
return 0;
static void net_slirp_redir(const char *redir_str)
int is_udp;
char buf[256], *r;
const char *p;
struct in_addr guest_addr;
int host_port, guest_port;
if (!slirp_inited) {
slirp_inited = 1;
p = redir_str;
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
goto fail;
if (!strcmp(buf, "tcp")) {
is_udp = 0;
} else if (!strcmp(buf, "udp")) {
is_udp = 1;
} else {
goto fail;
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
goto fail;
host_port = strtol(buf, &r, 0);
if (r == buf)
goto fail;
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
goto fail;
if (buf[0] == '\0') {
pstrcpy(buf, sizeof(buf), "");
if (!inet_aton(buf, &guest_addr))
goto fail;
guest_port = strtol(p, &r, 0);
if (r == p)
goto fail;
if (slirp_redir(is_udp, host_port, guest_addr, guest_port) < 0) {
fprintf(stderr, "qemu: could not set up redirection\n");
fprintf(stderr, "qemu: syntax: -redir [tcp|udp]:host-port:[guest-host]:guest-port\n");
#endif /* CONFIG_SLIRP */
#if !defined(_WIN32)
......@@ -2334,7 +2406,9 @@ void help(void)
"-tun-fd fd use this fd as already opened tap/tun interface\n"
"-user-net use user mode network stack [default if no tap/tun script]\n"
"-tftp prefix allow tftp access to files starting with prefix [only with -user-net enabled]\n"
"-tftp prefix allow tftp access to files starting with prefix [-user-net]\n"
"-redir [tcp|udp]:host-port:[guest-host]:guest-port\n"
" redirect TCP or UDP connections from host to guest [-user-net]\n"
"-dummy-net use dummy network stack\n"
......@@ -2410,6 +2484,7 @@ enum {
......@@ -2463,6 +2538,7 @@ const QEMUOption qemu_options[] = {
{ "user-net", 0, QEMU_OPTION_user_net },
{ "tftp", HAS_ARG, QEMU_OPTION_tftp },
{ "redir", HAS_ARG, QEMU_OPTION_redir },
{ "dummy-net", 0, QEMU_OPTION_dummy_net },
......@@ -2756,14 +2832,14 @@ int main(int argc, char **argv)
case QEMU_OPTION_tftp:
extern const char *tftp_prefix;
tftp_prefix = optarg;
case QEMU_OPTION_user_net:
net_if_type = NET_IF_USER;
case QEMU_OPTION_redir:
case QEMU_OPTION_dummy_net:
net_if_type = NET_IF_DUMMY;
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