Imported Debian patch 1.3.0-2012.12-0ubuntu1~linaro1debian/1.3.0-2012.12-0ubuntu1_linaro1

1 files changed, 470 insertions, 189 deletions

diff --git a/qemu-sockets.c b/qemu-sockets.c
index 361d890..d314cf1 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -22,8 +22,10 @@
 #include <errno.h>
 #include <unistd.h>
 
+#include "monitor.h"
 #include "qemu_socket.h"
 #include "qemu-common.h" /* for qemu_isdigit */
+#include "main-loop.h"
 
 #ifndef AI_ADDRCONFIG
 # define AI_ADDRCONFIG 0
@@ -54,9 +56,6 @@ static QemuOptsList dummy_opts = {
         },{
             .name = "ipv6",
             .type = QEMU_OPT_BOOL,
-        },{
-            .name = "block",
-            .type = QEMU_OPT_BOOL,
         },
         { /* end if list */ }
     },
@@ -122,8 +121,7 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
 
     if ((qemu_opt_get(opts, "host") == NULL) ||
         (qemu_opt_get(opts, "port") == NULL)) {
-        fprintf(stderr, "%s: host and/or port not specified\n", __FUNCTION__);
-        error_set(errp, QERR_SOCKET_CREATE_FAILED);
+        error_setg(errp, "host and/or port not specified");
         return -1;
     }
     pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
@@ -140,9 +138,8 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
         snprintf(port, sizeof(port), "%d", atoi(port) + port_offset);
     rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
     if (rc != 0) {
-        fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
-                gai_strerror(rc));
-        error_set(errp, QERR_SOCKET_CREATE_FAILED);
+        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
+                   gai_strerror(rc));
         return -1;
     }
 
@@ -153,10 +150,8 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
 		        NI_NUMERICHOST | NI_NUMERICSERV);
         slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
         if (slisten < 0) {
-            fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
-                    inet_strfamily(e->ai_family), strerror(errno));
             if (!e->ai_next) {
-                error_set(errp, QERR_SOCKET_CREATE_FAILED);
+                error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
             }
             continue;
         }
@@ -178,24 +173,19 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
                 goto listen;
             }
             if (p == port_max) {
-                fprintf(stderr,"%s: bind(%s,%s,%d): %s\n", __FUNCTION__,
-                        inet_strfamily(e->ai_family), uaddr, inet_getport(e),
-                        strerror(errno));
                 if (!e->ai_next) {
-                    error_set(errp, QERR_SOCKET_BIND_FAILED);
+                    error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
                 }
             }
         }
         closesocket(slisten);
     }
-    fprintf(stderr, "%s: FAILED\n", __FUNCTION__);
     freeaddrinfo(res);
     return -1;
 
 listen:
     if (listen(slisten,1) != 0) {
-        error_set(errp, QERR_SOCKET_LISTEN_FAILED);
-        perror("listen");
+        error_set_errno(errp, errno, QERR_SOCKET_LISTEN_FAILED);
         closesocket(slisten);
         freeaddrinfo(res);
         return -1;
@@ -209,104 +199,204 @@ listen:
     return slisten;
 }
 
-int inet_connect_opts(QemuOpts *opts, bool *in_progress, Error **errp)
+#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)
 {
-    struct addrinfo ai,*res,*e;
+    ConnectState *s = opaque;
+    int val = 0, rc = 0;
+    socklen_t valsize = sizeof(val);
+    bool in_progress;
+
+    qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
+
+    do {
+        rc = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
+    } while (rc == -1 && socket_error() == EINTR);
+
+    /* update rc to contain error */
+    if (!rc && val) {
+        rc = -1;
+    }
+
+    /* connect error */
+    if (rc < 0) {
+        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);
+            /* connect in progress */
+            if (in_progress) {
+                return;
+            }
+        }
+
+        freeaddrinfo(s->addr_list);
+    }
+
+    if (s->callback) {
+        s->callback(s->fd, s->opaque);
+    }
+    g_free(s);
+}
+
+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_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
+        return -1;
+    }
+    qemu_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+    if (connect_state != NULL) {
+        socket_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_handler2(sock, NULL, NULL, wait_for_connect,
+                             connect_state);
+        *in_progress = true;
+    } else if (rc < 0) {
+        error_set_errno(errp, errno, QERR_SOCKET_CONNECT_FAILED);
+        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;
-    char uaddr[INET6_ADDRSTRLEN+1];
-    char uport[33];
-    int sock,rc;
-    bool block;
 
-    memset(&ai,0, sizeof(ai));
+    memset(&ai, 0, sizeof(ai));
+
     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
     ai.ai_family = PF_UNSPEC;
     ai.ai_socktype = SOCK_STREAM;
 
-    if (in_progress) {
-        *in_progress = false;
-    }
-
     addr = qemu_opt_get(opts, "host");
     port = qemu_opt_get(opts, "port");
-    block = qemu_opt_get_bool(opts, "block", 0);
     if (addr == NULL || port == NULL) {
-        fprintf(stderr, "inet_connect: host and/or port not specified\n");
-        error_set(errp, QERR_SOCKET_CREATE_FAILED);
-        return -1;
+        error_setg(errp, "host and/or port not specified");
+        return NULL;
     }
 
-    if (qemu_opt_get_bool(opts, "ipv4", 0))
+    if (qemu_opt_get_bool(opts, "ipv4", 0)) {
         ai.ai_family = PF_INET;
-    if (qemu_opt_get_bool(opts, "ipv6", 0))
+    }
+    if (qemu_opt_get_bool(opts, "ipv6", 0)) {
         ai.ai_family = PF_INET6;
+    }
 
     /* lookup */
-    if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) {
-        fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
-                gai_strerror(rc));
-        error_set(errp, QERR_SOCKET_CREATE_FAILED);
-	return -1;
+    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)
+{
+    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) {
-        if (getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
-                            uaddr,INET6_ADDRSTRLEN,uport,32,
-                            NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
-            fprintf(stderr,"%s: getnameinfo: oops\n", __FUNCTION__);
-            continue;
-        }
-        sock = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
-        if (sock < 0) {
-            fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
-            inet_strfamily(e->ai_family), strerror(errno));
-            continue;
+        if (connect_state != NULL) {
+            connect_state->current_addr = e;
         }
-        setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
-        if (!block) {
-            socket_set_nonblock(sock);
-        }
-        /* connect to peer */
-        do {
-            rc = 0;
-            if (connect(sock, e->ai_addr, e->ai_addrlen) < 0) {
-                rc = -socket_error();
-            }
-        } while (rc == -EINTR);
-
-  #ifdef _WIN32
-        if (!block && (rc == -EINPROGRESS || rc == -EWOULDBLOCK
-                       || rc == -WSAEALREADY)) {
-  #else
-        if (!block && (rc == -EINPROGRESS)) {
-  #endif
-            if (in_progress) {
-                *in_progress = true;
+        sock = inet_connect_addr(e, &in_progress, connect_state, errp);
+        if (in_progress) {
+            return sock;
+        } else if (sock >= 0) {
+            /* non blocking socket immediate success, call callback */
+            if (callback != NULL) {
+                callback(sock, opaque);
             }
-        } else if (rc < 0) {
-            if (NULL == e->ai_next)
-                fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
-                        inet_strfamily(e->ai_family),
-                        e->ai_canonname, uaddr, uport, strerror(errno));
-            closesocket(sock);
-            continue;
+            break;
         }
-        freeaddrinfo(res);
-        return sock;
     }
-    error_set(errp, QERR_SOCKET_CONNECT_FAILED);
+    g_free(connect_state);
     freeaddrinfo(res);
-    return -1;
+    return sock;
 }
 
-int inet_dgram_opts(QemuOpts *opts)
+int inet_dgram_opts(QemuOpts *opts, Error **errp)
 {
     struct addrinfo ai, *peer = NULL, *local = NULL;
     const char *addr;
     const char *port;
-    char uaddr[INET6_ADDRSTRLEN+1];
-    char uport[33];
     int sock = -1, rc;
 
     /* lookup peer addr */
@@ -321,7 +411,7 @@ int inet_dgram_opts(QemuOpts *opts)
         addr = "localhost";
     }
     if (port == NULL || strlen(port) == 0) {
-        fprintf(stderr, "inet_dgram: port not specified\n");
+        error_setg(errp, "remote port not specified");
         return -1;
     }
 
@@ -331,8 +421,8 @@ int inet_dgram_opts(QemuOpts *opts)
         ai.ai_family = PF_INET6;
 
     if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
-        fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
-                gai_strerror(rc));
+        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
+                   gai_strerror(rc));
 	return -1;
     }
 
@@ -351,44 +441,28 @@ int inet_dgram_opts(QemuOpts *opts)
         port = "0";
 
     if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
-        fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
-                gai_strerror(rc));
-        return -1;
+        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) {
-        fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
-                inet_strfamily(peer->ai_family), strerror(errno));
+        error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
         goto err;
     }
     setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
 
     /* bind socket */
-    if (getnameinfo((struct sockaddr*)local->ai_addr,local->ai_addrlen,
-                    uaddr,INET6_ADDRSTRLEN,uport,32,
-                    NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
-        fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
-        goto err;
-    }
     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
-        fprintf(stderr,"%s: bind(%s,%s,%d): OK\n", __FUNCTION__,
-                inet_strfamily(local->ai_family), uaddr, inet_getport(local));
+        error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
         goto err;
     }
 
     /* connect to peer */
-    if (getnameinfo((struct sockaddr*)peer->ai_addr, peer->ai_addrlen,
-                    uaddr, INET6_ADDRSTRLEN, uport, 32,
-                    NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
-        fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
-        goto err;
-    }
     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
-        fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
-                inet_strfamily(peer->ai_family),
-                peer->ai_canonname, uaddr, uport, strerror(errno));
+        error_set_errno(errp, errno, QERR_SOCKET_CONNECT_FAILED);
         goto err;
     }
 
@@ -407,59 +481,92 @@ err:
 }
 
 /* compatibility wrapper */
-static int inet_parse(QemuOpts *opts, const char *str)
+static InetSocketAddress *inet_parse(const char *str, Error **errp)
 {
+    InetSocketAddress *addr;
     const char *optstr, *h;
-    char addr[64];
+    char host[64];
     char port[33];
+    int to;
     int pos;
 
+    addr = g_new0(InetSocketAddress, 1);
+
     /* parse address */
     if (str[0] == ':') {
         /* no host given */
-        addr[0] = '\0';
-        if (1 != sscanf(str,":%32[^,]%n",port,&pos)) {
-            fprintf(stderr, "%s: portonly parse error (%s)\n",
-                    __FUNCTION__, str);
-            return -1;
+        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",addr,port,&pos)) {
-            fprintf(stderr, "%s: ipv6 parse error (%s)\n",
-                    __FUNCTION__, str);
-            return -1;
+        if (2 != sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos)) {
+            error_setg(errp, "error parsing IPv6 address '%s'", str);
+            goto fail;
         }
-        qemu_opt_set(opts, "ipv6", "on");
+        addr->ipv6 = addr->has_ipv6 = true;
     } else if (qemu_isdigit(str[0])) {
         /* IPv4 addr */
-        if (2 != sscanf(str,"%64[0-9.]:%32[^,]%n",addr,port,&pos)) {
-            fprintf(stderr, "%s: ipv4 parse error (%s)\n",
-                    __FUNCTION__, str);
-            return -1;
+        if (2 != sscanf(str, "%64[0-9.]:%32[^,]%n", host, port, &pos)) {
+            error_setg(errp, "error parsing IPv4 address '%s'", str);
+            goto fail;
         }
-        qemu_opt_set(opts, "ipv4", "on");
+        addr->ipv4 = addr->has_ipv4 = true;
     } else {
         /* hostname */
-        if (2 != sscanf(str,"%64[^:]:%32[^,]%n",addr,port,&pos)) {
-            fprintf(stderr, "%s: hostname parse error (%s)\n",
-                    __FUNCTION__, str);
-            return -1;
+        if (2 != sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos)) {
+            error_setg(errp, "error parsing address '%s'", str);
+            goto fail;
         }
     }
-    qemu_opt_set(opts, "host", addr);
-    qemu_opt_set(opts, "port", port);
+
+    addr->host = g_strdup(host);
+    addr->port = g_strdup(port);
 
     /* parse options */
     optstr = str + pos;
     h = strstr(optstr, ",to=");
-    if (h)
-        qemu_opt_set(opts, "to", h+4);
-    if (strstr(optstr, ",ipv4"))
-        qemu_opt_set(opts, "ipv4", "on");
-    if (strstr(optstr, ",ipv6"))
-        qemu_opt_set(opts, "ipv6", "on");
-    return 0;
+    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, 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);
+        qemu_opt_set_bool(opts, "ipv6", ipv6);
+    }
+    if (addr->has_to) {
+        char to[20];
+        snprintf(to, sizeof(to), "%d", addr->to);
+        qemu_opt_set(opts, "to", to);
+    }
+    qemu_opt_set(opts, "host", addr->host);
+    qemu_opt_set(opts, "port", addr->port);
 }
 
 int inet_listen(const char *str, char *ostr, int olen,
@@ -468,9 +575,13 @@ int inet_listen(const char *str, char *ostr, int olen,
     QemuOpts *opts;
     char *optstr;
     int sock = -1;
+    InetSocketAddress *addr;
 
-    opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
-    if (inet_parse(opts, str) == 0) {
+    addr = inet_parse(str, errp);
+    if (addr != NULL) {
+        opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
+        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, ',');
@@ -486,34 +597,73 @@ int inet_listen(const char *str, char *ostr, int olen,
                          optstr ? optstr : "");
             }
         }
-    } else {
-        error_set(errp, QERR_SOCKET_CREATE_FAILED);
+        qemu_opts_del(opts);
     }
-    qemu_opts_del(opts);
     return sock;
 }
 
-int inet_connect(const char *str, bool block, bool *in_progress, Error **errp)
+/**
+ * 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;
 
-    opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
-    if (inet_parse(opts, str) == 0) {
-        if (block) {
-            qemu_opt_set(opts, "block", "on");
-        }
-        sock = inet_connect_opts(opts, in_progress, errp);
-    } else {
-        error_set(errp, QERR_SOCKET_CREATE_FAILED);
+    addr = inet_parse(str, errp);
+    if (addr != NULL) {
+        opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
+        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(&dummy_opts, NULL, 0, NULL);
+        inet_addr_to_opts(opts, addr);
+        qapi_free_InetSocketAddress(addr);
+        sock = inet_connect_opts(opts, errp, callback, opaque);
+        qemu_opts_del(opts);
     }
-    qemu_opts_del(opts);
     return sock;
 }
 
 #ifndef _WIN32
 
-int unix_listen_opts(QemuOpts *opts)
+int unix_listen_opts(QemuOpts *opts, Error **errp)
 {
     struct sockaddr_un un;
     const char *path = qemu_opt_get(opts, "path");
@@ -521,7 +671,7 @@ int unix_listen_opts(QemuOpts *opts)
 
     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
     if (sock < 0) {
-        perror("socket(unix)");
+        error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
         return -1;
     }
 
@@ -546,11 +696,11 @@ int unix_listen_opts(QemuOpts *opts)
 
     unlink(un.sun_path);
     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
-        fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
+        error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
         goto err;
     }
     if (listen(sock, 1) < 0) {
-        fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
+        error_set_errno(errp, errno, QERR_SOCKET_LISTEN_FAILED);
         goto err;
     }
 
@@ -561,37 +711,85 @@ err:
     return -1;
 }
 
-int unix_connect_opts(QemuOpts *opts)
+int unix_connect_opts(QemuOpts *opts, Error **errp,
+                      NonBlockingConnectHandler *callback, void *opaque)
 {
     struct sockaddr_un un;
     const char *path = qemu_opt_get(opts, "path");
-    int sock;
+    ConnectState *connect_state = NULL;
+    int sock, rc;
 
     if (NULL == path) {
-        fprintf(stderr, "unix connect: no path specified\n");
+        error_setg(errp, "unix connect: no path specified\n");
         return -1;
     }
 
     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
     if (sock < 0) {
-        perror("socket(unix)");
+        error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
         return -1;
     }
+    if (callback != NULL) {
+        connect_state = g_malloc0(sizeof(*connect_state));
+        connect_state->callback = callback;
+        connect_state->opaque = opaque;
+        socket_set_nonblock(sock);
+    }
 
     memset(&un, 0, sizeof(un));
     un.sun_family = AF_UNIX;
     snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
-    if (connect(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
-        fprintf(stderr, "connect(unix:%s): %s\n", path, strerror(errno));
+
+    /* 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_handler2(sock, NULL, NULL, wait_for_connect,
+                             connect_state);
+        return sock;
+    } else if (rc >= 0) {
+        /* non blocking socket immediate success, call callback */
+        if (callback != NULL) {
+            callback(sock, opaque);
+        }
+    }
+
+    if (rc < 0) {
+        error_set_errno(errp, -rc, QERR_SOCKET_CONNECT_FAILED);
         close(sock);
-	return -1;
+        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)
+int unix_listen(const char *str, char *ostr, int olen, Error **errp)
 {
     QemuOpts *opts;
     char *path, *optstr;
@@ -612,7 +810,7 @@ int unix_listen(const char *str, char *ostr, int olen)
         qemu_opt_set(opts, "path", str);
     }
 
-    sock = unix_listen_opts(opts);
+    sock = unix_listen_opts(opts, errp);
 
     if (sock != -1 && ostr)
         snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : "");
@@ -620,49 +818,132 @@ int unix_listen(const char *str, char *ostr, int olen)
     return sock;
 }
 
-int unix_connect(const char *path)
+int unix_connect(const char *path, Error **errp)
 {
     QemuOpts *opts;
     int sock;
 
     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
     qemu_opt_set(opts, "path", path);
-    sock = unix_connect_opts(opts);
+    sock = unix_connect_opts(opts, errp, NULL, NULL);
     qemu_opts_del(opts);
     return sock;
 }
 
-#else
 
-int unix_listen_opts(QemuOpts *opts)
+int unix_nonblocking_connect(const char *path,
+                             NonBlockingConnectHandler *callback,
+                             void *opaque, Error **errp)
 {
-    fprintf(stderr, "unix sockets are not available on windows\n");
-    errno = ENOTSUP;
-    return -1;
+    QemuOpts *opts;
+    int sock = -1;
+
+    g_assert(callback != NULL);
+
+    opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
+    qemu_opt_set(opts, "path", path);
+    sock = unix_connect_opts(opts, errp, callback, opaque);
+    qemu_opts_del(opts);
+    return sock;
 }
 
-int unix_connect_opts(QemuOpts *opts)
+SocketAddress *socket_parse(const char *str, Error **errp)
 {
-    fprintf(stderr, "unix sockets are not available on windows\n");
-    errno = ENOTSUP;
-    return -1;
+    SocketAddress *addr = NULL;
+
+    addr = g_new(SocketAddress, 1);
+    if (strstart(str, "unix:", NULL)) {
+        if (str[5] == '\0') {
+            error_setg(errp, "invalid Unix socket address\n");
+            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\n");
+            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 = g_new(InetSocketAddress, 1);
+        addr->inet = inet_parse(str, errp);
+        if (addr->inet == NULL) {
+            goto fail;
+        }
+    }
+    return addr;
+
+fail:
+    qapi_free_SocketAddress(addr);
+    return NULL;
 }
 
-int unix_listen(const char *path, char *ostr, int olen)
+int socket_connect(SocketAddress *addr, Error **errp,
+                   NonBlockingConnectHandler *callback, void *opaque)
 {
-    fprintf(stderr, "unix sockets are not available on windows\n");
-    errno = ENOTSUP;
-    return -1;
+    QemuOpts *opts;
+    int fd;
+
+    opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
+    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);
+        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 (callback) {
+            callback(fd, opaque);
+        }
+        break;
+
+    default:
+        abort();
+    }
+    qemu_opts_del(opts);
+    return fd;
 }
 
-int unix_connect(const char *path)
+int socket_listen(SocketAddress *addr, Error **errp)
 {
-    fprintf(stderr, "unix sockets are not available on windows\n");
-    errno = ENOTSUP;
-    return -1;
-}
+    QemuOpts *opts;
+    int fd;
 
-#endif
+    opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
+    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);
+        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;
+}
 
 #ifdef _WIN32
 static void socket_cleanup(void)