Initial import of qemu-2.4.1HEADmaster

1 files changed, 1017 insertions, 0 deletions

diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
new file mode 100644
index 00000000..2add83a0
--- /dev/null
+++ b/util/qemu-sockets.c
@@ -0,0 +1,1017 @@
+/*
+ *  inet and unix socket functions for qemu
+ *
+ *  (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; under version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "monitor/monitor.h"
+#include "qemu/sockets.h"
+#include "qemu/main-loop.h"
+
+#ifndef AI_ADDRCONFIG
+# define AI_ADDRCONFIG 0
+#endif
+#ifndef AI_V4MAPPED
+# define AI_V4MAPPED 0
+#endif
+
+/* used temporarily until all users are converted to QemuOpts */
+QemuOptsList socket_optslist = {
+    .name = "socket",
+    .head = QTAILQ_HEAD_INITIALIZER(socket_optslist.head),
+    .desc = {
+        {
+            .name = "path",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "host",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "port",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "localaddr",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "localport",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "to",
+            .type = QEMU_OPT_NUMBER,
+        },{
+            .name = "ipv4",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "ipv6",
+            .type = QEMU_OPT_BOOL,
+        },
+        { /* end if list */ }
+    },
+};
+
+static int inet_getport(struct addrinfo *e)
+{
+    struct sockaddr_in *i4;
+    struct sockaddr_in6 *i6;
+
+    switch (e->ai_family) {
+    case PF_INET6:
+        i6 = (void*)e->ai_addr;
+        return ntohs(i6->sin6_port);
+    case PF_INET:
+        i4 = (void*)e->ai_addr;
+        return ntohs(i4->sin_port);
+    default:
+        return 0;
+    }
+}
+
+static void inet_setport(struct addrinfo *e, int port)
+{
+    struct sockaddr_in *i4;
+    struct sockaddr_in6 *i6;
+
+    switch (e->ai_family) {
+    case PF_INET6:
+        i6 = (void*)e->ai_addr;
+        i6->sin6_port = htons(port);
+        break;
+    case PF_INET:
+        i4 = (void*)e->ai_addr;
+        i4->sin_port = htons(port);
+        break;
+    }
+}
+
+NetworkAddressFamily inet_netfamily(int family)
+{
+    switch (family) {
+    case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6;
+    case PF_INET:  return NETWORK_ADDRESS_FAMILY_IPV4;
+    case PF_UNIX:  return NETWORK_ADDRESS_FAMILY_UNIX;
+    }
+    return NETWORK_ADDRESS_FAMILY_UNKNOWN;
+}
+
+int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
+{
+    struct addrinfo ai,*res,*e;
+    const char *addr;
+    char port[33];
+    char uaddr[INET6_ADDRSTRLEN+1];
+    char uport[33];
+    int slisten, rc, to, port_min, port_max, p;
+
+    memset(&ai,0, sizeof(ai));
+    ai.ai_flags = AI_PASSIVE;
+    ai.ai_family = PF_UNSPEC;
+    ai.ai_socktype = SOCK_STREAM;
+
+    if ((qemu_opt_get(opts, "host") == NULL) ||
+        (qemu_opt_get(opts, "port") == NULL)) {
+        error_setg(errp, "host and/or port not specified");
+        return -1;
+    }
+    pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
+    addr = qemu_opt_get(opts, "host");
+
+    to = qemu_opt_get_number(opts, "to", 0);
+    if (qemu_opt_get_bool(opts, "ipv4", 0))
+        ai.ai_family = PF_INET;
+    if (qemu_opt_get_bool(opts, "ipv6", 0))
+        ai.ai_family = PF_INET6;
+
+    /* lookup */
+    if (port_offset) {
+        unsigned long long baseport;
+        if (parse_uint_full(port, &baseport, 10) < 0) {
+            error_setg(errp, "can't convert to a number: %s", port);
+            return -1;
+        }
+        if (baseport > 65535 ||
+            baseport + port_offset > 65535) {
+            error_setg(errp, "port %s out of range", port);
+            return -1;
+        }
+        snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
+    }
+    rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
+    if (rc != 0) {
+        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
+                   gai_strerror(rc));
+        return -1;
+    }
+
+    /* create socket + bind */
+    for (e = res; e != NULL; e = e->ai_next) {
+        getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
+		        uaddr,INET6_ADDRSTRLEN,uport,32,
+		        NI_NUMERICHOST | NI_NUMERICSERV);
+        slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
+        if (slisten < 0) {
+            if (!e->ai_next) {
+                error_setg_errno(errp, errno, "Failed to create socket");
+            }
+            continue;
+        }
+
+        socket_set_fast_reuse(slisten);
+#ifdef IPV6_V6ONLY
+        if (e->ai_family == PF_INET6) {
+            /* listen on both ipv4 and ipv6 */
+            const int off = 0;
+            qemu_setsockopt(slisten, IPPROTO_IPV6, IPV6_V6ONLY, &off,
+                            sizeof(off));
+        }
+#endif
+
+        port_min = inet_getport(e);
+        port_max = to ? to + port_offset : port_min;
+        for (p = port_min; p <= port_max; p++) {
+            inet_setport(e, p);
+            if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
+                goto listen;
+            }
+            if (p == port_max) {
+                if (!e->ai_next) {
+                    error_setg_errno(errp, errno, "Failed to bind socket");
+                }
+            }
+        }
+        closesocket(slisten);
+    }
+    freeaddrinfo(res);
+    return -1;
+
+listen:
+    if (listen(slisten,1) != 0) {
+        error_setg_errno(errp, errno, "Failed to listen on socket");
+        closesocket(slisten);
+        freeaddrinfo(res);
+        return -1;
+    }
+    qemu_opt_set(opts, "host", uaddr, &error_abort);
+    qemu_opt_set_number(opts, "port", inet_getport(e) - port_offset,
+                        &error_abort);
+    qemu_opt_set_bool(opts, "ipv6", e->ai_family == PF_INET6,
+                      &error_abort);
+    qemu_opt_set_bool(opts, "ipv4", e->ai_family != PF_INET6,
+                      &error_abort);
+    freeaddrinfo(res);
+    return slisten;
+}
+
+#ifdef _WIN32
+#define QEMU_SOCKET_RC_INPROGRESS(rc) \
+    ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
+#else
+#define QEMU_SOCKET_RC_INPROGRESS(rc) \
+    ((rc) == -EINPROGRESS)
+#endif
+
+/* Struct to store connect state for non blocking connect */
+typedef struct ConnectState {
+    int fd;
+    struct addrinfo *addr_list;
+    struct addrinfo *current_addr;
+    NonBlockingConnectHandler *callback;
+    void *opaque;
+} ConnectState;
+
+static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
+                             ConnectState *connect_state, Error **errp);
+
+static void wait_for_connect(void *opaque)
+{
+    ConnectState *s = opaque;
+    int val = 0, rc = 0;
+    socklen_t valsize = sizeof(val);
+    bool in_progress;
+    Error *err = NULL;
+
+    qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
+
+    do {
+        rc = qemu_getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
+    } while (rc == -1 && socket_error() == EINTR);
+
+    /* update rc to contain error */
+    if (!rc && val) {
+        rc = -1;
+        errno = val;
+    }
+
+    /* connect error */
+    if (rc < 0) {
+        error_setg_errno(&err, errno, "Error connecting to socket");
+        closesocket(s->fd);
+        s->fd = rc;
+    }
+
+    /* try to connect to the next address on the list */
+    if (s->current_addr) {
+        while (s->current_addr->ai_next != NULL && s->fd < 0) {
+            s->current_addr = s->current_addr->ai_next;
+            s->fd = inet_connect_addr(s->current_addr, &in_progress, s, NULL);
+            if (s->fd < 0) {
+                error_free(err);
+                err = NULL;
+                error_setg_errno(&err, errno, "Unable to start socket connect");
+            }
+            /* connect in progress */
+            if (in_progress) {
+                goto out;
+            }
+        }
+
+        freeaddrinfo(s->addr_list);
+    }
+
+    if (s->callback) {
+        s->callback(s->fd, err, s->opaque);
+    }
+    g_free(s);
+out:
+    error_free(err);
+}
+
+static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
+                             ConnectState *connect_state, Error **errp)
+{
+    int sock, rc;
+
+    *in_progress = false;
+
+    sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
+    if (sock < 0) {
+        error_setg_errno(errp, errno, "Failed to create socket");
+        return -1;
+    }
+    socket_set_fast_reuse(sock);
+    if (connect_state != NULL) {
+        qemu_set_nonblock(sock);
+    }
+    /* connect to peer */
+    do {
+        rc = 0;
+        if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
+            rc = -socket_error();
+        }
+    } while (rc == -EINTR);
+
+    if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
+        connect_state->fd = sock;
+        qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
+        *in_progress = true;
+    } else if (rc < 0) {
+        error_setg_errno(errp, errno, "Failed to connect socket");
+        closesocket(sock);
+        return -1;
+    }
+    return sock;
+}
+
+static struct addrinfo *inet_parse_connect_opts(QemuOpts *opts, Error **errp)
+{
+    struct addrinfo ai, *res;
+    int rc;
+    const char *addr;
+    const char *port;
+
+    memset(&ai, 0, sizeof(ai));
+
+    ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
+    ai.ai_family = PF_UNSPEC;
+    ai.ai_socktype = SOCK_STREAM;
+
+    addr = qemu_opt_get(opts, "host");
+    port = qemu_opt_get(opts, "port");
+    if (addr == NULL || port == NULL) {
+        error_setg(errp, "host and/or port not specified");
+        return NULL;
+    }
+
+    if (qemu_opt_get_bool(opts, "ipv4", 0)) {
+        ai.ai_family = PF_INET;
+    }
+    if (qemu_opt_get_bool(opts, "ipv6", 0)) {
+        ai.ai_family = PF_INET6;
+    }
+
+    /* lookup */
+    rc = getaddrinfo(addr, port, &ai, &res);
+    if (rc != 0) {
+        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
+                   gai_strerror(rc));
+        return NULL;
+    }
+    return res;
+}
+
+/**
+ * Create a socket and connect it to an address.
+ *
+ * @opts: QEMU options, recognized parameters strings "host" and "port",
+ *        bools "ipv4" and "ipv6".
+ * @errp: set on error
+ * @callback: callback function for non-blocking connect
+ * @opaque: opaque for callback function
+ *
+ * Returns: -1 on error, file descriptor on success.
+ *
+ * If @callback is non-null, the connect is non-blocking.  If this
+ * function succeeds, callback will be called when the connection
+ * completes, with the file descriptor on success, or -1 on error.
+ */
+int inet_connect_opts(QemuOpts *opts, Error **errp,
+                      NonBlockingConnectHandler *callback, void *opaque)
+{
+    Error *local_err = NULL;
+    struct addrinfo *res, *e;
+    int sock = -1;
+    bool in_progress;
+    ConnectState *connect_state = NULL;
+
+    res = inet_parse_connect_opts(opts, errp);
+    if (!res) {
+        return -1;
+    }
+
+    if (callback != NULL) {
+        connect_state = g_malloc0(sizeof(*connect_state));
+        connect_state->addr_list = res;
+        connect_state->callback = callback;
+        connect_state->opaque = opaque;
+    }
+
+    for (e = res; e != NULL; e = e->ai_next) {
+        error_free(local_err);
+        local_err = NULL;
+        if (connect_state != NULL) {
+            connect_state->current_addr = e;
+        }
+        sock = inet_connect_addr(e, &in_progress, connect_state, &local_err);
+        if (sock >= 0) {
+            break;
+        }
+    }
+
+    if (sock < 0) {
+        error_propagate(errp, local_err);
+    } else if (in_progress) {
+        /* wait_for_connect() will do the rest */
+        return sock;
+    } else {
+        if (callback) {
+            callback(sock, NULL, opaque);
+        }
+    }
+    g_free(connect_state);
+    freeaddrinfo(res);
+    return sock;
+}
+
+int inet_dgram_opts(QemuOpts *opts, Error **errp)
+{
+    struct addrinfo ai, *peer = NULL, *local = NULL;
+    const char *addr;
+    const char *port;
+    int sock = -1, rc;
+
+    /* lookup peer addr */
+    memset(&ai,0, sizeof(ai));
+    ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
+    ai.ai_family = PF_UNSPEC;
+    ai.ai_socktype = SOCK_DGRAM;
+
+    addr = qemu_opt_get(opts, "host");
+    port = qemu_opt_get(opts, "port");
+    if (addr == NULL || strlen(addr) == 0) {
+        addr = "localhost";
+    }
+    if (port == NULL || strlen(port) == 0) {
+        error_setg(errp, "remote port not specified");
+        return -1;
+    }
+
+    if (qemu_opt_get_bool(opts, "ipv4", 0))
+        ai.ai_family = PF_INET;
+    if (qemu_opt_get_bool(opts, "ipv6", 0))
+        ai.ai_family = PF_INET6;
+
+    if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
+        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
+                   gai_strerror(rc));
+	return -1;
+    }
+
+    /* lookup local addr */
+    memset(&ai,0, sizeof(ai));
+    ai.ai_flags = AI_PASSIVE;
+    ai.ai_family = peer->ai_family;
+    ai.ai_socktype = SOCK_DGRAM;
+
+    addr = qemu_opt_get(opts, "localaddr");
+    port = qemu_opt_get(opts, "localport");
+    if (addr == NULL || strlen(addr) == 0) {
+        addr = NULL;
+    }
+    if (!port || strlen(port) == 0)
+        port = "0";
+
+    if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
+        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
+                   gai_strerror(rc));
+        goto err;
+    }
+
+    /* create socket */
+    sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
+    if (sock < 0) {
+        error_setg_errno(errp, errno, "Failed to create socket");
+        goto err;
+    }
+    socket_set_fast_reuse(sock);
+
+    /* bind socket */
+    if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
+        error_setg_errno(errp, errno, "Failed to bind socket");
+        goto err;
+    }
+
+    /* connect to peer */
+    if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
+        error_setg_errno(errp, errno, "Failed to connect socket");
+        goto err;
+    }
+
+    freeaddrinfo(local);
+    freeaddrinfo(peer);
+    return sock;
+
+err:
+    if (-1 != sock)
+        closesocket(sock);
+    if (local)
+        freeaddrinfo(local);
+    if (peer)
+        freeaddrinfo(peer);
+    return -1;
+}
+
+/* compatibility wrapper */
+InetSocketAddress *inet_parse(const char *str, Error **errp)
+{
+    InetSocketAddress *addr;
+    const char *optstr, *h;
+    char host[65];
+    char port[33];
+    int to;
+    int pos;
+
+    addr = g_new0(InetSocketAddress, 1);
+
+    /* parse address */
+    if (str[0] == ':') {
+        /* no host given */
+        host[0] = '\0';
+        if (1 != sscanf(str, ":%32[^,]%n", port, &pos)) {
+            error_setg(errp, "error parsing port in address '%s'", str);
+            goto fail;
+        }
+    } else if (str[0] == '[') {
+        /* IPv6 addr */
+        if (2 != sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos)) {
+            error_setg(errp, "error parsing IPv6 address '%s'", str);
+            goto fail;
+        }
+        addr->ipv6 = addr->has_ipv6 = true;
+    } else {
+        /* hostname or IPv4 addr */
+        if (2 != sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos)) {
+            error_setg(errp, "error parsing address '%s'", str);
+            goto fail;
+        }
+        if (host[strspn(host, "0123456789.")] == '\0') {
+            addr->ipv4 = addr->has_ipv4 = true;
+        }
+    }
+
+    addr->host = g_strdup(host);
+    addr->port = g_strdup(port);
+
+    /* parse options */
+    optstr = str + pos;
+    h = strstr(optstr, ",to=");
+    if (h) {
+        h += 4;
+        if (sscanf(h, "%d%n", &to, &pos) != 1 ||
+            (h[pos] != '\0' && h[pos] != ',')) {
+            error_setg(errp, "error parsing to= argument");
+            goto fail;
+        }
+        addr->has_to = true;
+        addr->to = to;
+    }
+    if (strstr(optstr, ",ipv4")) {
+        addr->ipv4 = addr->has_ipv4 = true;
+    }
+    if (strstr(optstr, ",ipv6")) {
+        addr->ipv6 = addr->has_ipv6 = true;
+    }
+    return addr;
+
+fail:
+    qapi_free_InetSocketAddress(addr);
+    return NULL;
+}
+
+static void inet_addr_to_opts(QemuOpts *opts, const InetSocketAddress *addr)
+{
+    bool ipv4 = addr->ipv4 || !addr->has_ipv4;
+    bool ipv6 = addr->ipv6 || !addr->has_ipv6;
+
+    if (!ipv4 || !ipv6) {
+        qemu_opt_set_bool(opts, "ipv4", ipv4, &error_abort);
+        qemu_opt_set_bool(opts, "ipv6", ipv6, &error_abort);
+    }
+    if (addr->has_to) {
+        qemu_opt_set_number(opts, "to", addr->to, &error_abort);
+    }
+    qemu_opt_set(opts, "host", addr->host, &error_abort);
+    qemu_opt_set(opts, "port", addr->port, &error_abort);
+}
+
+int inet_listen(const char *str, char *ostr, int olen,
+                int socktype, int port_offset, Error **errp)
+{
+    QemuOpts *opts;
+    char *optstr;
+    int sock = -1;
+    InetSocketAddress *addr;
+
+    addr = inet_parse(str, errp);
+    if (addr != NULL) {
+        opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+        inet_addr_to_opts(opts, addr);
+        qapi_free_InetSocketAddress(addr);
+        sock = inet_listen_opts(opts, port_offset, errp);
+        if (sock != -1 && ostr) {
+            optstr = strchr(str, ',');
+            if (qemu_opt_get_bool(opts, "ipv6", 0)) {
+                snprintf(ostr, olen, "[%s]:%s%s",
+                         qemu_opt_get(opts, "host"),
+                         qemu_opt_get(opts, "port"),
+                         optstr ? optstr : "");
+            } else {
+                snprintf(ostr, olen, "%s:%s%s",
+                         qemu_opt_get(opts, "host"),
+                         qemu_opt_get(opts, "port"),
+                         optstr ? optstr : "");
+            }
+        }
+        qemu_opts_del(opts);
+    }
+    return sock;
+}
+
+/**
+ * Create a blocking socket and connect it to an address.
+ *
+ * @str: address string
+ * @errp: set in case of an error
+ *
+ * Returns -1 in case of error, file descriptor on success
+ **/
+int inet_connect(const char *str, Error **errp)
+{
+    QemuOpts *opts;
+    int sock = -1;
+    InetSocketAddress *addr;
+
+    addr = inet_parse(str, errp);
+    if (addr != NULL) {
+        opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+        inet_addr_to_opts(opts, addr);
+        qapi_free_InetSocketAddress(addr);
+        sock = inet_connect_opts(opts, errp, NULL, NULL);
+        qemu_opts_del(opts);
+    }
+    return sock;
+}
+
+/**
+ * Create a non-blocking socket and connect it to an address.
+ * Calls the callback function with fd in case of success or -1 in case of
+ * error.
+ *
+ * @str: address string
+ * @callback: callback function that is called when connect completes,
+ *            cannot be NULL.
+ * @opaque: opaque for callback function
+ * @errp: set in case of an error
+ *
+ * Returns: -1 on immediate error, file descriptor on success.
+ **/
+int inet_nonblocking_connect(const char *str,
+                             NonBlockingConnectHandler *callback,
+                             void *opaque, Error **errp)
+{
+    QemuOpts *opts;
+    int sock = -1;
+    InetSocketAddress *addr;
+
+    g_assert(callback != NULL);
+
+    addr = inet_parse(str, errp);
+    if (addr != NULL) {
+        opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+        inet_addr_to_opts(opts, addr);
+        qapi_free_InetSocketAddress(addr);
+        sock = inet_connect_opts(opts, errp, callback, opaque);
+        qemu_opts_del(opts);
+    }
+    return sock;
+}
+
+#ifndef _WIN32
+
+int unix_listen_opts(QemuOpts *opts, Error **errp)
+{
+    struct sockaddr_un un;
+    const char *path = qemu_opt_get(opts, "path");
+    int sock, fd;
+
+    sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
+    if (sock < 0) {
+        error_setg_errno(errp, errno, "Failed to create Unix socket");
+        return -1;
+    }
+
+    memset(&un, 0, sizeof(un));
+    un.sun_family = AF_UNIX;
+    if (path && strlen(path)) {
+        snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
+    } else {
+        const char *tmpdir = getenv("TMPDIR");
+        tmpdir = tmpdir ? tmpdir : "/tmp";
+        if (snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
+                     tmpdir) >= sizeof(un.sun_path)) {
+            error_setg_errno(errp, errno,
+                             "TMPDIR environment variable (%s) too large", tmpdir);
+            goto err;
+        }
+
+        /*
+         * This dummy fd usage silences the mktemp() unsecure warning.
+         * Using mkstemp() doesn't make things more secure here
+         * though.  bind() complains about existing files, so we have
+         * to unlink first and thus re-open the race window.  The
+         * worst case possible is bind() failing, i.e. a DoS attack.
+         */
+        fd = mkstemp(un.sun_path);
+        if (fd < 0) {
+            error_setg_errno(errp, errno,
+                             "Failed to make a temporary socket name in %s", tmpdir);
+            goto err;
+        }
+        close(fd);
+        qemu_opt_set(opts, "path", un.sun_path, &error_abort);
+    }
+
+    if ((access(un.sun_path, F_OK) == 0) &&
+        unlink(un.sun_path) < 0) {
+        error_setg_errno(errp, errno,
+                         "Failed to unlink socket %s", un.sun_path);
+        goto err;
+    }
+    if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
+        error_setg_errno(errp, errno, "Failed to bind socket to %s", un.sun_path);
+        goto err;
+    }
+    if (listen(sock, 1) < 0) {
+        error_setg_errno(errp, errno, "Failed to listen on socket");
+        goto err;
+    }
+
+    return sock;
+
+err:
+    closesocket(sock);
+    return -1;
+}
+
+int unix_connect_opts(QemuOpts *opts, Error **errp,
+                      NonBlockingConnectHandler *callback, void *opaque)
+{
+    struct sockaddr_un un;
+    const char *path = qemu_opt_get(opts, "path");
+    ConnectState *connect_state = NULL;
+    int sock, rc;
+
+    if (path == NULL) {
+        error_setg(errp, "unix connect: no path specified");
+        return -1;
+    }
+
+    sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
+    if (sock < 0) {
+        error_setg_errno(errp, errno, "Failed to create socket");
+        return -1;
+    }
+    if (callback != NULL) {
+        connect_state = g_malloc0(sizeof(*connect_state));
+        connect_state->callback = callback;
+        connect_state->opaque = opaque;
+        qemu_set_nonblock(sock);
+    }
+
+    memset(&un, 0, sizeof(un));
+    un.sun_family = AF_UNIX;
+    snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
+
+    /* connect to peer */
+    do {
+        rc = 0;
+        if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
+            rc = -socket_error();
+        }
+    } while (rc == -EINTR);
+
+    if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
+        connect_state->fd = sock;
+        qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
+        return sock;
+    } else if (rc >= 0) {
+        /* non blocking socket immediate success, call callback */
+        if (callback != NULL) {
+            callback(sock, NULL, opaque);
+        }
+    }
+
+    if (rc < 0) {
+        error_setg_errno(errp, -rc, "Failed to connect socket");
+        close(sock);
+        sock = -1;
+    }
+
+    g_free(connect_state);
+    return sock;
+}
+
+#else
+
+int unix_listen_opts(QemuOpts *opts, Error **errp)
+{
+    error_setg(errp, "unix sockets are not available on windows");
+    errno = ENOTSUP;
+    return -1;
+}
+
+int unix_connect_opts(QemuOpts *opts, Error **errp,
+                      NonBlockingConnectHandler *callback, void *opaque)
+{
+    error_setg(errp, "unix sockets are not available on windows");
+    errno = ENOTSUP;
+    return -1;
+}
+#endif
+
+/* compatibility wrapper */
+int unix_listen(const char *str, char *ostr, int olen, Error **errp)
+{
+    QemuOpts *opts;
+    char *path, *optstr;
+    int sock, len;
+
+    opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+
+    optstr = strchr(str, ',');
+    if (optstr) {
+        len = optstr - str;
+        if (len) {
+            path = g_malloc(len+1);
+            snprintf(path, len+1, "%.*s", len, str);
+            qemu_opt_set(opts, "path", path, &error_abort);
+            g_free(path);
+        }
+    } else {
+        qemu_opt_set(opts, "path", str, &error_abort);
+    }
+
+    sock = unix_listen_opts(opts, errp);
+
+    if (sock != -1 && ostr)
+        snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : "");
+    qemu_opts_del(opts);
+    return sock;
+}
+
+int unix_connect(const char *path, Error **errp)
+{
+    QemuOpts *opts;
+    int sock;
+
+    opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+    qemu_opt_set(opts, "path", path, &error_abort);
+    sock = unix_connect_opts(opts, errp, NULL, NULL);
+    qemu_opts_del(opts);
+    return sock;
+}
+
+
+int unix_nonblocking_connect(const char *path,
+                             NonBlockingConnectHandler *callback,
+                             void *opaque, Error **errp)
+{
+    QemuOpts *opts;
+    int sock = -1;
+
+    g_assert(callback != NULL);
+
+    opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+    qemu_opt_set(opts, "path", path, &error_abort);
+    sock = unix_connect_opts(opts, errp, callback, opaque);
+    qemu_opts_del(opts);
+    return sock;
+}
+
+SocketAddress *socket_parse(const char *str, Error **errp)
+{
+    SocketAddress *addr;
+
+    addr = g_new0(SocketAddress, 1);
+    if (strstart(str, "unix:", NULL)) {
+        if (str[5] == '\0') {
+            error_setg(errp, "invalid Unix socket address");
+            goto fail;
+        } else {
+            addr->kind = SOCKET_ADDRESS_KIND_UNIX;
+            addr->q_unix = g_new(UnixSocketAddress, 1);
+            addr->q_unix->path = g_strdup(str + 5);
+        }
+    } else if (strstart(str, "fd:", NULL)) {
+        if (str[3] == '\0') {
+            error_setg(errp, "invalid file descriptor address");
+            goto fail;
+        } else {
+            addr->kind = SOCKET_ADDRESS_KIND_FD;
+            addr->fd = g_new(String, 1);
+            addr->fd->str = g_strdup(str + 3);
+        }
+    } else {
+        addr->kind = SOCKET_ADDRESS_KIND_INET;
+        addr->inet = inet_parse(str, errp);
+        if (addr->inet == NULL) {
+            goto fail;
+        }
+    }
+    return addr;
+
+fail:
+    qapi_free_SocketAddress(addr);
+    return NULL;
+}
+
+int socket_connect(SocketAddress *addr, Error **errp,
+                   NonBlockingConnectHandler *callback, void *opaque)
+{
+    QemuOpts *opts;
+    int fd;
+
+    opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+    switch (addr->kind) {
+    case SOCKET_ADDRESS_KIND_INET:
+        inet_addr_to_opts(opts, addr->inet);
+        fd = inet_connect_opts(opts, errp, callback, opaque);
+        break;
+
+    case SOCKET_ADDRESS_KIND_UNIX:
+        qemu_opt_set(opts, "path", addr->q_unix->path, &error_abort);
+        fd = unix_connect_opts(opts, errp, callback, opaque);
+        break;
+
+    case SOCKET_ADDRESS_KIND_FD:
+        fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
+        if (fd >= 0 && callback) {
+            qemu_set_nonblock(fd);
+            callback(fd, NULL, opaque);
+        }
+        break;
+
+    default:
+        abort();
+    }
+    qemu_opts_del(opts);
+    return fd;
+}
+
+int socket_listen(SocketAddress *addr, Error **errp)
+{
+    QemuOpts *opts;
+    int fd;
+
+    opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+    switch (addr->kind) {
+    case SOCKET_ADDRESS_KIND_INET:
+        inet_addr_to_opts(opts, addr->inet);
+        fd = inet_listen_opts(opts, 0, errp);
+        break;
+
+    case SOCKET_ADDRESS_KIND_UNIX:
+        qemu_opt_set(opts, "path", addr->q_unix->path, &error_abort);
+        fd = unix_listen_opts(opts, errp);
+        break;
+
+    case SOCKET_ADDRESS_KIND_FD:
+        fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
+        break;
+
+    default:
+        abort();
+    }
+    qemu_opts_del(opts);
+    return fd;
+}
+
+int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
+{
+    QemuOpts *opts;
+    int fd;
+
+    opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
+    switch (remote->kind) {
+    case SOCKET_ADDRESS_KIND_INET:
+        inet_addr_to_opts(opts, remote->inet);
+        if (local) {
+            qemu_opt_set(opts, "localaddr", local->inet->host, &error_abort);
+            qemu_opt_set(opts, "localport", local->inet->port, &error_abort);
+        }
+        fd = inet_dgram_opts(opts, errp);
+        break;
+
+    default:
+        error_setg(errp, "socket type unsupported for datagram");
+        fd = -1;
+    }
+    qemu_opts_del(opts);
+    return fd;
+}