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-rw-r--r--net/socket.c561
1 files changed, 561 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c
new file mode 100644
index 0000000000..551fc2b9e8
--- /dev/null
+++ b/net/socket.c
@@ -0,0 +1,561 @@
+/*
+ * 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-option.h"
+#include "qemu_socket.h"
+#include "sysemu.h"
+
+typedef struct NetSocketState {
+ VLANClientState *vc;
+ 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 *vc, const uint8_t *buf, size_t size)
+{
+ NetSocketState *s = vc->opaque;
+ 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 *vc, const uint8_t *buf, size_t size)
+{
+ NetSocketState *s = vc->opaque;
+
+ 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->vc, 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->vc, s->buf, size);
+}
+
+static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
+{
+ 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 = 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;
+ 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;
+ }
+
+ socket_set_nonblock(fd);
+ return fd;
+fail:
+ if (fd >= 0)
+ closesocket(fd);
+ return -1;
+}
+
+static void net_socket_cleanup(VLANClientState *vc)
+{
+ NetSocketState *s = vc->opaque;
+ qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
+ close(s->fd);
+ qemu_free(s);
+}
+
+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;
+ 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);
+ 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;
+ }
+ }
+
+ s = qemu_mallocz(sizeof(NetSocketState));
+ s->fd = fd;
+
+ s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_SOCKET,
+ vlan, NULL, model, name, NULL,
+ net_socket_receive_dgram, NULL, NULL,
+ net_socket_cleanup, s);
+ 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;
+
+ snprintf(s->vc->info_str, sizeof(s->vc->info_str),
+ "socket: fd=%d (%s mcast=%s:%d)",
+ fd, is_connected? "cloned" : "",
+ inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
+ return s;
+}
+
+static void net_socket_connect(void *opaque)
+{
+ NetSocketState *s = opaque;
+ qemu_set_fd_handler(s->fd, net_socket_send, NULL, s);
+}
+
+static NetSocketState *net_socket_fd_init_stream(VLANState *vlan,
+ const char *model,
+ const char *name,
+ int fd, int is_connected)
+{
+ NetSocketState *s;
+ s = qemu_mallocz(sizeof(NetSocketState));
+ s->fd = fd;
+ s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_SOCKET,
+ vlan, NULL, model, name, NULL,
+ net_socket_receive, NULL, NULL,
+ net_socket_cleanup, s);
+ snprintf(s->vc->info_str, sizeof(s->vc->info_str),
+ "socket: fd=%d", 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 = 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->vc->info_str, sizeof(s1->vc->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 = 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 = 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) {
+ 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->vc->info_str, sizeof(s->vc->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)
+{
+ NetSocketState *s;
+ int fd;
+ struct sockaddr_in saddr;
+
+ if (parse_host_port(&saddr, host_str) < 0)
+ return -1;
+
+
+ fd = net_socket_mcast_create(&saddr);
+ 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->vc->info_str, sizeof(s->vc->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_error("listen=, connect= and mcast= is invalid with fd=\n");
+ 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_error("fd=, connect= and mcast= is invalid with listen=\n");
+ 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_error("fd=, listen= and mcast= is invalid with connect=\n");
+ 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;
+
+ if (qemu_opt_get(opts, "fd") ||
+ qemu_opt_get(opts, "connect") ||
+ qemu_opt_get(opts, "listen")) {
+ qemu_error("fd=, connect= and listen= is invalid with mcast=\n");
+ return -1;
+ }
+
+ mcast = qemu_opt_get(opts, "mcast");
+
+ if (net_socket_mcast_init(vlan, "socket", name, mcast) == -1) {
+ return -1;
+ }
+ } else {
+ qemu_error("-socket requires fd=, listen=, connect= or mcast=\n");
+ return -1;
+ }
+
+ if (vlan) {
+ vlan->nb_host_devs++;
+ }
+
+ return 0;
+}
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