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qemu/net/socket.c

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/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "net/socket.h"
#include "config-host.h"
#include "net.h"
#include "qemu-char.h"
#include "qemu-common.h"
#include "qemu-error.h"
#include "qemu-option.h"
#include "qemu_socket.h"
typedef struct NetSocketState {
VLANClientState nc;
int fd;
int state; /* 0 = getting length, 1 = getting data */
unsigned int index;
unsigned int packet_len;
uint8_t buf[4096];
struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
} NetSocketState;
typedef struct NetSocketListenState {
VLANState *vlan;
char *model;
char *name;
int fd;
} NetSocketListenState;
/* XXX: we consider we can send the whole packet without blocking */
static ssize_t net_socket_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
{
NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
uint32_t len;
len = htonl(size);
send_all(s->fd, (const uint8_t *)&len, sizeof(len));
return send_all(s->fd, buf, size);
}
static ssize_t net_socket_receive_dgram(VLANClientState *nc, const uint8_t *buf, size_t size)
{
NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
return sendto(s->fd, (const void *)buf, size, 0,
(struct sockaddr *)&s->dgram_dst, sizeof(s->dgram_dst));
}
static void net_socket_send(void *opaque)
{
NetSocketState *s = opaque;
int size, err;
unsigned l;
uint8_t buf1[4096];
const uint8_t *buf;
size = recv(s->fd, (void *)buf1, sizeof(buf1), 0);
if (size < 0) {
err = socket_error();
if (err != EWOULDBLOCK)
goto eoc;
} else if (size == 0) {
/* end of connection */
eoc:
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
closesocket(s->fd);
return;
}
buf = buf1;
while (size > 0) {
/* reassemble a packet from the network */
switch(s->state) {
case 0:
l = 4 - s->index;
if (l > size)
l = size;
memcpy(s->buf + s->index, buf, l);
buf += l;
size -= l;
s->index += l;
if (s->index == 4) {
/* got length */
s->packet_len = ntohl(*(uint32_t *)s->buf);
s->index = 0;
s->state = 1;
}
break;
case 1:
l = s->packet_len - s->index;
if (l > size)
l = size;
if (s->index + l <= sizeof(s->buf)) {
memcpy(s->buf + s->index, buf, l);
} else {
fprintf(stderr, "serious error: oversized packet received,"
"connection terminated.\n");
s->state = 0;
goto eoc;
}
s->index += l;
buf += l;
size -= l;
if (s->index >= s->packet_len) {
qemu_send_packet(&s->nc, s->buf, s->packet_len);
s->index = 0;
s->state = 0;
}
break;
}
}
}
static void net_socket_send_dgram(void *opaque)
{
NetSocketState *s = opaque;
int size;
size = recv(s->fd, (void *)s->buf, sizeof(s->buf), 0);
if (size < 0)
return;
if (size == 0) {
/* end of connection */
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
return;
}
qemu_send_packet(&s->nc, s->buf, size);
}
static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr *localaddr)
{
struct ip_mreq imr;
int fd;
int val, ret;
if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) does not contain a multicast address\n",
inet_ntoa(mcastaddr->sin_addr),
(int)ntohl(mcastaddr->sin_addr.s_addr));
return -1;
}
fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
perror("socket(PF_INET, SOCK_DGRAM)");
return -1;
}
val = 1;
ret=setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
(const char *)&val, sizeof(val));
if (ret < 0) {
perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
goto fail;
}
ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
if (ret < 0) {
perror("bind");
goto fail;
}
/* Add host to multicast group */
imr.imr_multiaddr = mcastaddr->sin_addr;
if (localaddr) {
imr.imr_interface = *localaddr;
} else {
imr.imr_interface.s_addr = htonl(INADDR_ANY);
}
ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(const char *)&imr, sizeof(struct ip_mreq));
if (ret < 0) {
perror("setsockopt(IP_ADD_MEMBERSHIP)");
goto fail;
}
/* Force mcast msgs to loopback (eg. several QEMUs in same host */
val = 1;
ret=setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
(const char *)&val, sizeof(val));
if (ret < 0) {
perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
goto fail;
}
/* If a bind address is given, only send packets from that address */
if (localaddr != NULL) {
ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
(const char *)localaddr, sizeof(*localaddr));
if (ret < 0) {
perror("setsockopt(IP_MULTICAST_IF)");
goto fail;
}
}
socket_set_nonblock(fd);
return fd;
fail:
if (fd >= 0)
closesocket(fd);
return -1;
}
static void net_socket_cleanup(VLANClientState *nc)
{
NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
close(s->fd);
}
static NetClientInfo net_dgram_socket_info = {
.type = NET_CLIENT_TYPE_SOCKET,
.size = sizeof(NetSocketState),
.receive = net_socket_receive_dgram,
.cleanup = net_socket_cleanup,
};
static NetSocketState *net_socket_fd_init_dgram(VLANState *vlan,
const char *model,
const char *name,
int fd, int is_connected)
{
struct sockaddr_in saddr;
int newfd;
socklen_t saddr_len;
VLANClientState *nc;
NetSocketState *s;
/* fd passed: multicast: "learn" dgram_dst address from bound address and save it
* Because this may be "shared" socket from a "master" process, datagrams would be recv()
* by ONLY ONE process: we must "clone" this dgram socket --jjo
*/
if (is_connected) {
if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
/* must be bound */
if (saddr.sin_addr.s_addr==0) {
fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, cannot setup multicast dst addr\n",
fd);
return NULL;
}
/* clone dgram socket */
newfd = net_socket_mcast_create(&saddr, NULL);
if (newfd < 0) {
/* error already reported by net_socket_mcast_create() */
close(fd);
return NULL;
}
/* clone newfd to fd, close newfd */
dup2(newfd, fd);
close(newfd);
} else {
fprintf(stderr, "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
fd, strerror(errno));
return NULL;
}
}
nc = qemu_new_net_client(&net_dgram_socket_info, vlan, NULL, model, name);
snprintf(nc->info_str, sizeof(nc->info_str),
"socket: fd=%d (%s mcast=%s:%d)",
fd, is_connected ? "cloned" : "",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
s = DO_UPCAST(NetSocketState, nc, nc);
s->fd = fd;
qemu_set_fd_handler(s->fd, net_socket_send_dgram, NULL, s);
/* mcast: save bound address as dst */
if (is_connected) s->dgram_dst=saddr;
return s;
}
static void net_socket_connect(void *opaque)
{
NetSocketState *s = opaque;
qemu_set_fd_handler(s->fd, net_socket_send, NULL, s);
}
static NetClientInfo net_socket_info = {
.type = NET_CLIENT_TYPE_SOCKET,
.size = sizeof(NetSocketState),
.receive = net_socket_receive,
.cleanup = net_socket_cleanup,
};
static NetSocketState *net_socket_fd_init_stream(VLANState *vlan,
const char *model,
const char *name,
int fd, int is_connected)
{
VLANClientState *nc;
NetSocketState *s;
nc = qemu_new_net_client(&net_socket_info, vlan, NULL, model, name);
snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
s = DO_UPCAST(NetSocketState, nc, nc);
s->fd = fd;
if (is_connected) {
net_socket_connect(s);
} else {
qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
}
return s;
}
static NetSocketState *net_socket_fd_init(VLANState *vlan,
const char *model, const char *name,
int fd, int is_connected)
{
int so_type = -1, optlen=sizeof(so_type);
if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
(socklen_t *)&optlen)< 0) {
fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n", fd);
return NULL;
}
switch(so_type) {
case SOCK_DGRAM:
return net_socket_fd_init_dgram(vlan, model, name, fd, is_connected);
case SOCK_STREAM:
return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
default:
/* who knows ... this could be a eg. a pty, do warn and continue as stream */
fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
}
return NULL;
}
static void net_socket_accept(void *opaque)
{
NetSocketListenState *s = opaque;
NetSocketState *s1;
struct sockaddr_in saddr;
socklen_t len;
int fd;
for(;;) {
len = sizeof(saddr);
fd = qemu_accept(s->fd, (struct sockaddr *)&saddr, &len);
if (fd < 0 && errno != EINTR) {
return;
} else if (fd >= 0) {
break;
}
}
s1 = net_socket_fd_init(s->vlan, s->model, s->name, fd, 1);
if (!s1) {
closesocket(fd);
} else {
snprintf(s1->nc.info_str, sizeof(s1->nc.info_str),
"socket: connection from %s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
}
}
static int net_socket_listen_init(VLANState *vlan,
const char *model,
const char *name,
const char *host_str)
{
NetSocketListenState *s;
int fd, val, ret;
struct sockaddr_in saddr;
if (parse_host_port(&saddr, host_str) < 0)
return -1;
s = qemu_mallocz(sizeof(NetSocketListenState));
fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
return -1;
}
socket_set_nonblock(fd);
/* allow fast reuse */
val = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
if (ret < 0) {
perror("bind");
return -1;
}
ret = listen(fd, 0);
if (ret < 0) {
perror("listen");
return -1;
}
s->vlan = vlan;
s->model = qemu_strdup(model);
s->name = name ? qemu_strdup(name) : NULL;
s->fd = fd;
qemu_set_fd_handler(fd, net_socket_accept, NULL, s);
return 0;
}
static int net_socket_connect_init(VLANState *vlan,
const char *model,
const char *name,
const char *host_str)
{
NetSocketState *s;
int fd, connected, ret, err;
struct sockaddr_in saddr;
if (parse_host_port(&saddr, host_str) < 0)
return -1;
fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
return -1;
}
socket_set_nonblock(fd);
connected = 0;
for(;;) {
ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
if (ret < 0) {
err = socket_error();
if (err == EINTR || err == EWOULDBLOCK) {
} else if (err == EINPROGRESS) {
break;
#ifdef _WIN32
} else if (err == WSAEALREADY || err == WSAEINVAL) {
break;
#endif
} else {
perror("connect");
closesocket(fd);
return -1;
}
} else {
connected = 1;
break;
}
}
s = net_socket_fd_init(vlan, model, name, fd, connected);
if (!s)
return -1;
snprintf(s->nc.info_str, sizeof(s->nc.info_str),
"socket: connect to %s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
return 0;
}
static int net_socket_mcast_init(VLANState *vlan,
const char *model,
const char *name,
const char *host_str,
const char *localaddr_str)
{
NetSocketState *s;
int fd;
struct sockaddr_in saddr;
struct in_addr localaddr, *param_localaddr;
if (parse_host_port(&saddr, host_str) < 0)
return -1;
if (localaddr_str != NULL) {
if (inet_aton(localaddr_str, &localaddr) == 0)
return -1;
param_localaddr = &localaddr;
} else {
param_localaddr = NULL;
}
fd = net_socket_mcast_create(&saddr, param_localaddr);
if (fd < 0)
return -1;
s = net_socket_fd_init(vlan, model, name, fd, 0);
if (!s)
return -1;
s->dgram_dst = saddr;
snprintf(s->nc.info_str, sizeof(s->nc.info_str),
"socket: mcast=%s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
return 0;
}
int net_init_socket(QemuOpts *opts,
Monitor *mon,
const char *name,
VLANState *vlan)
{
if (qemu_opt_get(opts, "fd")) {
int fd;
if (qemu_opt_get(opts, "listen") ||
qemu_opt_get(opts, "connect") ||
qemu_opt_get(opts, "mcast") ||
qemu_opt_get(opts, "localaddr")) {
error_report("listen=, connect=, mcast= and localaddr= is invalid with fd=");
return -1;
}
fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
if (fd == -1) {
return -1;
}
if (!net_socket_fd_init(vlan, "socket", name, fd, 1)) {
close(fd);
return -1;
}
} else if (qemu_opt_get(opts, "listen")) {
const char *listen;
if (qemu_opt_get(opts, "fd") ||
qemu_opt_get(opts, "connect") ||
qemu_opt_get(opts, "mcast") ||
qemu_opt_get(opts, "localaddr")) {
error_report("fd=, connect=, mcast= and localaddr= is invalid with listen=");
return -1;
}
listen = qemu_opt_get(opts, "listen");
if (net_socket_listen_init(vlan, "socket", name, listen) == -1) {
return -1;
}
} else if (qemu_opt_get(opts, "connect")) {
const char *connect;
if (qemu_opt_get(opts, "fd") ||
qemu_opt_get(opts, "listen") ||
qemu_opt_get(opts, "mcast") ||
qemu_opt_get(opts, "localaddr")) {
error_report("fd=, listen=, mcast= and localaddr= is invalid with connect=");
return -1;
}
connect = qemu_opt_get(opts, "connect");
if (net_socket_connect_init(vlan, "socket", name, connect) == -1) {
return -1;
}
} else if (qemu_opt_get(opts, "mcast")) {
const char *mcast, *localaddr;
if (qemu_opt_get(opts, "fd") ||
qemu_opt_get(opts, "connect") ||
qemu_opt_get(opts, "listen")) {
error_report("fd=, connect= and listen= is invalid with mcast=");
return -1;
}
mcast = qemu_opt_get(opts, "mcast");
localaddr = qemu_opt_get(opts, "localaddr");
if (net_socket_mcast_init(vlan, "socket", name, mcast, localaddr) == -1) {
return -1;
}
} else {
error_report("-socket requires fd=, listen=, connect= or mcast=");
return -1;
}
return 0;
}
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