diff options
Diffstat (limited to 'src/net/socket.c')
| -rw-r--r-- | src/net/socket.c | 774 |
1 files changed, 774 insertions, 0 deletions
diff --git a/src/net/socket.c b/src/net/socket.c new file mode 100644 index 0000000..e8605d4 --- /dev/null +++ b/src/net/socket.c @@ -0,0 +1,774 @@ +/* + * 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 "config-host.h" + +#include "net/net.h" +#include "clients.h" +#include "monitor/monitor.h" +#include "qemu-common.h" +#include "qemu/error-report.h" +#include "qemu/option.h" +#include "qemu/sockets.h" +#include "qemu/iov.h" +#include "qemu/main-loop.h" + +typedef struct NetSocketState { + NetClientState nc; + int listen_fd; + int fd; + int state; /* 0 = getting length, 1 = getting data */ + unsigned int index; + unsigned int packet_len; + unsigned int send_index; /* number of bytes sent (only SOCK_STREAM) */ + uint8_t buf[NET_BUFSIZE]; + struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */ + IOHandler *send_fn; /* differs between SOCK_STREAM/SOCK_DGRAM */ + bool read_poll; /* waiting to receive data? */ + bool write_poll; /* waiting to transmit data? */ +} NetSocketState; + +static void net_socket_accept(void *opaque); +static void net_socket_writable(void *opaque); + +static void net_socket_update_fd_handler(NetSocketState *s) +{ + qemu_set_fd_handler(s->fd, + s->read_poll ? s->send_fn : NULL, + s->write_poll ? net_socket_writable : NULL, + s); +} + +static void net_socket_read_poll(NetSocketState *s, bool enable) +{ + s->read_poll = enable; + net_socket_update_fd_handler(s); +} + +static void net_socket_write_poll(NetSocketState *s, bool enable) +{ + s->write_poll = enable; + net_socket_update_fd_handler(s); +} + +static void net_socket_writable(void *opaque) +{ + NetSocketState *s = opaque; + + net_socket_write_poll(s, false); + + qemu_flush_queued_packets(&s->nc); +} + +static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size) +{ + NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc); + uint32_t len = htonl(size); + struct iovec iov[] = { + { + .iov_base = &len, + .iov_len = sizeof(len), + }, { + .iov_base = (void *)buf, + .iov_len = size, + }, + }; + size_t remaining; + ssize_t ret; + + remaining = iov_size(iov, 2) - s->send_index; + ret = iov_send(s->fd, iov, 2, s->send_index, remaining); + + if (ret == -1 && errno == EAGAIN) { + ret = 0; /* handled further down */ + } + if (ret == -1) { + s->send_index = 0; + return -errno; + } + if (ret < (ssize_t)remaining) { + s->send_index += ret; + net_socket_write_poll(s, true); + return 0; + } + s->send_index = 0; + return size; +} + +static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size) +{ + NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc); + ssize_t ret; + + do { + ret = qemu_sendto(s->fd, buf, size, 0, + (struct sockaddr *)&s->dgram_dst, + sizeof(s->dgram_dst)); + } while (ret == -1 && errno == EINTR); + + if (ret == -1 && errno == EAGAIN) { + net_socket_write_poll(s, true); + return 0; + } + return ret; +} + +static void net_socket_send_completed(NetClientState *nc, ssize_t len) +{ + NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc); + + if (!s->read_poll) { + net_socket_read_poll(s, true); + } +} + +static void net_socket_send(void *opaque) +{ + NetSocketState *s = opaque; + int size, err; + unsigned l; + uint8_t buf1[NET_BUFSIZE]; + const uint8_t *buf; + + size = qemu_recv(s->fd, buf1, sizeof(buf1), 0); + if (size < 0) { + err = socket_error(); + if (err != EWOULDBLOCK) + goto eoc; + } else if (size == 0) { + /* end of connection */ + eoc: + net_socket_read_poll(s, false); + net_socket_write_poll(s, false); + 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; + 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) { + s->index = 0; + s->state = 0; + if (qemu_send_packet_async(&s->nc, s->buf, s->packet_len, + net_socket_send_completed) == 0) { + net_socket_read_poll(s, false); + break; + } + } + break; + } + } +} + +static void net_socket_send_dgram(void *opaque) +{ + NetSocketState *s = opaque; + int size; + + size = qemu_recv(s->fd, s->buf, sizeof(s->buf), 0); + if (size < 0) + return; + if (size == 0) { + /* end of connection */ + net_socket_read_poll(s, false); + net_socket_write_poll(s, false); + return; + } + if (qemu_send_packet_async(&s->nc, s->buf, size, + net_socket_send_completed) == 0) { + net_socket_read_poll(s, false); + } +} + +static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr *localaddr) +{ + struct ip_mreq imr; + int fd; + int val, ret; +#ifdef __OpenBSD__ + unsigned char loop; +#else + int loop; +#endif + + 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; + } + + /* Allow multiple sockets to bind the same multicast ip and port by setting + * SO_REUSEADDR. This is the only situation where SO_REUSEADDR should be set + * on windows. Use socket_set_fast_reuse otherwise as it sets SO_REUSEADDR + * only on posix systems. + */ + val = 1; + ret = qemu_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &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 = qemu_setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, + &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 */ + loop = 1; + ret = qemu_setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, + &loop, sizeof(loop)); + 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 = qemu_setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, + localaddr, sizeof(*localaddr)); + if (ret < 0) { + perror("setsockopt(IP_MULTICAST_IF)"); + goto fail; + } + } + + qemu_set_nonblock(fd); + return fd; +fail: + if (fd >= 0) + closesocket(fd); + return -1; +} + +static void net_socket_cleanup(NetClientState *nc) +{ + NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc); + if (s->fd != -1) { + net_socket_read_poll(s, false); + net_socket_write_poll(s, false); + 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 = { + .type = NET_CLIENT_OPTIONS_KIND_SOCKET, + .size = sizeof(NetSocketState), + .receive = net_socket_receive_dgram, + .cleanup = net_socket_cleanup, +}; + +static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer, + const char *model, + const char *name, + int fd, int is_connected) +{ + struct sockaddr_in saddr; + int newfd; + socklen_t saddr_len = sizeof(saddr); + NetClientState *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); + goto err; + } + /* clone dgram socket */ + newfd = net_socket_mcast_create(&saddr, NULL); + if (newfd < 0) { + /* error already reported by net_socket_mcast_create() */ + goto err; + } + /* 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)); + goto err; + } + } + + nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name); + + s = DO_UPCAST(NetSocketState, nc, nc); + + s->fd = fd; + s->listen_fd = -1; + s->send_fn = net_socket_send_dgram; + net_socket_read_poll(s, true); + + /* mcast: save bound address as dst */ + if (is_connected) { + s->dgram_dst = saddr; + snprintf(nc->info_str, sizeof(nc->info_str), + "socket: fd=%d (cloned mcast=%s:%d)", + fd, inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port)); + } else { + snprintf(nc->info_str, sizeof(nc->info_str), + "socket: fd=%d", fd); + } + + return s; + +err: + closesocket(fd); + return NULL; +} + +static void net_socket_connect(void *opaque) +{ + NetSocketState *s = opaque; + s->send_fn = net_socket_send; + net_socket_read_poll(s, true); +} + +static NetClientInfo net_socket_info = { + .type = NET_CLIENT_OPTIONS_KIND_SOCKET, + .size = sizeof(NetSocketState), + .receive = net_socket_receive, + .cleanup = net_socket_cleanup, +}; + +static NetSocketState *net_socket_fd_init_stream(NetClientState *peer, + const char *model, + const char *name, + int fd, int is_connected) +{ + NetClientState *nc; + NetSocketState *s; + + nc = qemu_new_net_client(&net_socket_info, peer, model, name); + + snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd); + + s = DO_UPCAST(NetSocketState, nc, nc); + + s->fd = fd; + s->listen_fd = -1; + + /* Disable Nagle algorithm on TCP sockets to reduce latency */ + socket_set_nodelay(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(NetClientState *peer, + 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); + closesocket(fd); + return NULL; + } + switch(so_type) { + case SOCK_DGRAM: + return net_socket_fd_init_dgram(peer, model, name, fd, is_connected); + case SOCK_STREAM: + return net_socket_fd_init_stream(peer, 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(peer, model, name, fd, is_connected); + } + return NULL; +} + +static void net_socket_accept(void *opaque) +{ + NetSocketState *s = opaque; + struct sockaddr_in saddr; + socklen_t len; + int fd; + + for(;;) { + len = sizeof(saddr); + 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; + } + } + + 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, + const char *model, + const char *name, + const char *host_str) +{ + NetClientState *nc; + NetSocketState *s; + struct sockaddr_in saddr; + int fd, ret; + + 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; + } + qemu_set_nonblock(fd); + + socket_set_fast_reuse(fd); + + ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)); + if (ret < 0) { + perror("bind"); + closesocket(fd); + return -1; + } + ret = listen(fd, 0); + if (ret < 0) { + perror("listen"); + closesocket(fd); + return -1; + } + + 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; +} + +static int net_socket_connect_init(NetClientState *peer, + 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; + } + qemu_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(peer, 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(NetClientState *peer, + 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(peer, 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; + +} + +static int net_socket_udp_init(NetClientState *peer, + const char *model, + const char *name, + const char *rhost, + const char *lhost) +{ + NetSocketState *s; + int fd, ret; + struct sockaddr_in laddr, raddr; + + if (parse_host_port(&laddr, lhost) < 0) { + return -1; + } + + if (parse_host_port(&raddr, rhost) < 0) { + return -1; + } + + fd = qemu_socket(PF_INET, SOCK_DGRAM, 0); + if (fd < 0) { + perror("socket(PF_INET, SOCK_DGRAM)"); + return -1; + } + + ret = socket_set_fast_reuse(fd); + if (ret < 0) { + closesocket(fd); + return -1; + } + ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr)); + if (ret < 0) { + perror("bind"); + closesocket(fd); + return -1; + } + qemu_set_nonblock(fd); + + s = net_socket_fd_init(peer, model, name, fd, 0); + if (!s) { + return -1; + } + + s->dgram_dst = raddr; + + snprintf(s->nc.info_str, sizeof(s->nc.info_str), + "socket: udp=%s:%d", + inet_ntoa(raddr.sin_addr), ntohs(raddr.sin_port)); + return 0; +} + +int net_init_socket(const NetClientOptions *opts, const char *name, + NetClientState *peer, Error **errp) +{ + /* FIXME error_setg(errp, ...) on failure */ + Error *err = NULL; + const NetdevSocketOptions *sock; + + assert(opts->type == NET_CLIENT_OPTIONS_KIND_SOCKET); + sock = opts->u.socket; + + if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast + + sock->has_udp != 1) { + error_report("exactly one of fd=, listen=, connect=, mcast= or udp=" + " is required"); + return -1; + } + + if (sock->has_localaddr && !sock->has_mcast && !sock->has_udp) { + error_report("localaddr= is only valid with mcast= or udp="); + return -1; + } + + if (sock->has_fd) { + int fd; + + fd = monitor_fd_param(cur_mon, sock->fd, &err); + if (fd == -1) { + error_report_err(err); + return -1; + } + qemu_set_nonblock(fd); + if (!net_socket_fd_init(peer, "socket", name, fd, 1)) { + return -1; + } + return 0; + } + + if (sock->has_listen) { + if (net_socket_listen_init(peer, "socket", name, sock->listen) == -1) { + return -1; + } + return 0; + } + + if (sock->has_connect) { + if (net_socket_connect_init(peer, "socket", name, sock->connect) == + -1) { + return -1; + } + return 0; + } + + if (sock->has_mcast) { + /* if sock->localaddr is missing, it has been initialized to "all bits + * zero" */ + if (net_socket_mcast_init(peer, "socket", name, sock->mcast, + sock->localaddr) == -1) { + return -1; + } + return 0; + } + + assert(sock->has_udp); + if (!sock->has_localaddr) { + error_report("localaddr= is mandatory with udp="); + return -1; + } + if (net_socket_udp_init(peer, "socket", name, sock->udp, sock->localaddr) == + -1) { + return -1; + } + return 0; +} |
