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net: add the support for -netdev socket, listen 

The -net socket,listen option does not work with the newer -netdev
syntax:
 http://lists.gnu.org/archive/html/qemu-devel/2011-11/msg01508.html

This patch makes it work now.

For the case where one vlan has multiple listenning sockets,
the patch will also provide the support.

Supported syntax:
 1.) -net socket,listen=127.0.0.1:1234,vlan=0
 2.) -net socket,listen=127.0.0.1:1234,vlan=0 -net socket,listen=127.0.0.1:1235,vlan=0
 3.) -netdev socket,listen=127.0.0.1:1234,id=socket0

 Drop the NetSocketListenState struct and add a listen_fd field
to NetSocketState.  When a -netdev socket,listen= instance is created
there will be a NetSocketState with fd=-1 and a valid listen_fd.  The
net_socket_accept() handler waits for listen_fd to become readable and
then accepts the connection.  When this state transition happens, we no
longer monitor listen_fd for incoming connections...until the client
disconnects again.

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Zhi Yong Wu 2012-07-20 14:25:53 +01:00 committed by Stefan Hajnoczi
parent e34cde35e7
commit 011de2b512
1 changed files with 47 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
net/socket.c
View File

@ -35,6 +35,7 @@
typedef struct NetSocketState {
NetClientState nc;
int listen_fd;
int fd;
int state; /* 0 = getting length, 1 = getting data */
unsigned int index;
@ -43,12 +44,7 @@ typedef struct NetSocketState {
struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
} NetSocketState;
typedef struct NetSocketListenState {
NetClientState *peer;
char *model;
char *name;
int fd;
} NetSocketListenState;
static void net_socket_accept(void *opaque);
/* XXX: we consider we can send the whole packet without blocking */
static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size)
@ -86,7 +82,19 @@ static void net_socket_send(void *opaque)
/* end of connection */
eoc:
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
if (s->listen_fd != -1) {
qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
}
closesocket(s->fd);
s->fd = -1;
s->state = 0;
s->index = 0;
s->packet_len = 0;
s->nc.link_down = true;
memset(s->buf, 0, sizeof(s->buf));
memset(s->nc.info_str, 0, sizeof(s->nc.info_str));
return;
}
buf = buf1;
@ -234,8 +242,16 @@ fail:
static void net_socket_cleanup(NetClientState *nc)
{
NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
close(s->fd);
if (s->fd != -1) {
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
close(s->fd);
s->fd = -1;
}
if (s->listen_fd != -1) {
qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
closesocket(s->listen_fd);
s->listen_fd = -1;
}
}
static NetClientInfo net_dgram_socket_info = {
@ -297,6 +313,7 @@ static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
s = DO_UPCAST(NetSocketState, nc, nc);
s->fd = fd;
s->listen_fd = -1;
qemu_set_fd_handler(s->fd, net_socket_send_dgram, NULL, s);
@ -340,6 +357,7 @@ static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
s = DO_UPCAST(NetSocketState, nc, nc);
s->fd = fd;
s->listen_fd = -1;
if (is_connected) {
net_socket_connect(s);
@ -377,27 +395,28 @@ static NetSocketState *net_socket_fd_init(NetClientState *peer,
static void net_socket_accept(void *opaque)
{
NetSocketListenState *s = opaque;
NetSocketState *s1;
NetSocketState *s = opaque;
struct sockaddr_in saddr;
socklen_t len;
int fd;
for(;;) {
len = sizeof(saddr);
fd = qemu_accept(s->fd, (struct sockaddr *)&saddr, &len);
fd = qemu_accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
if (fd < 0 && errno != EINTR) {
return;
} else if (fd >= 0) {
qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
break;
}
}
s1 = net_socket_fd_init(s->peer, s->model, s->name, fd, 1);
if (s1) {
snprintf(s1->nc.info_str, sizeof(s1->nc.info_str),
"socket: connection from %s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
}
s->fd = fd;
s->nc.link_down = false;
net_socket_connect(s);
snprintf(s->nc.info_str, sizeof(s->nc.info_str),
"socket: connection from %s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
}
static int net_socket_listen_init(NetClientState *peer,
@ -405,19 +424,17 @@ static int net_socket_listen_init(NetClientState *peer,
const char *name,
const char *host_str)
{
NetSocketListenState *s;
int fd, val, ret;
NetClientState *nc;
NetSocketState *s;
struct sockaddr_in saddr;
int fd, val, ret;
if (parse_host_port(&saddr, host_str) < 0)
return -1;
s = g_malloc0(sizeof(NetSocketListenState));
fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
g_free(s);
return -1;
}
socket_set_nonblock(fd);
@ -429,22 +446,23 @@ static int net_socket_listen_init(NetClientState *peer,
ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
if (ret < 0) {
perror("bind");
g_free(s);
closesocket(fd);
return -1;
}
ret = listen(fd, 0);
if (ret < 0) {
perror("listen");
g_free(s);
closesocket(fd);
return -1;
}
s->peer = peer;
s->model = g_strdup(model);
s->name = name ? g_strdup(name) : NULL;
s->fd = fd;
qemu_set_fd_handler(fd, net_socket_accept, NULL, s);
nc = qemu_new_net_client(&net_socket_info, peer, model, name);
s = DO_UPCAST(NetSocketState, nc, nc);
s->fd = -1;
s->listen_fd = fd;
s->nc.link_down = true;
qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
return 0;
}