[Qemu-devel] [RFC][PATCH v3 20/21] virtproxy: qemu-vp, main logic

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 qemu-vp.c   |  368 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 virtproxy.c |   24 ----
 2 files changed, 367 insertions(+), 25 deletions(-)

diff --git a/qemu-vp.c b/qemu-vp.c
index 5075cdc..cfd2a69 100644
--- a/qemu-vp.c
+++ b/qemu-vp.c
@@ -9,10 +9,54 @@
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  *
+ * 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 <getopt.h>
+#include <err.h>
+#include "qemu-option.h"
+#include "qemu_socket.h"
 #include "virtproxy.h"
 
+static bool verbose_enabled = 0;
+#define DEBUG_ENABLED
+
+#ifdef DEBUG_ENABLED
+#define DEBUG(msg, ...) do { \
+    fprintf(stderr, "%s:%s():L%d: " msg "\n", \
+            __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
+} while(0)
+#else
+#define DEBUG(msg, ...) do {} while (0)
+#endif
+
+#define INFO(msg, ...) do { \
+    if (!verbose_enabled) { \
+        break; \
+    } \
+    warnx(msg, ## __VA_ARGS__); \
+} while(0)
+
 /* mirror qemu I/O-related code for standalone daemon */
 typedef struct IOHandlerRecord {
     int fd;
@@ -92,13 +136,19 @@ int vp_send_all(int fd, const void *buf, int len1)
     return len1 - len;
 }
 
+/* qemu_chr_read doesn't get used in guest so noop our wrapper function */
+void vp_chr_read(CharDriverState *s, uint8_t *buf, int len)
+{
+    return;
+}
+
 static void main_loop_wait(int nonblocking)
 {
     IOHandlerRecord *ioh;
     fd_set rfds, wfds, xfds;
     int ret, nfds;
     struct timeval tv;
-    int timeout = 1000;
+    int timeout = 100000;
 
     if (nonblocking) {
         timeout = 0;
@@ -149,3 +199,319 @@ static void main_loop_wait(int nonblocking)
         }
     }
 }
+
+#define VP_ARG_LEN 256
+
+typedef struct VPData {
+    QemuOpts *opts;
+    void *opaque;
+    QTAILQ_ENTRY(VPData) next;
+} VPData;
+
+static QTAILQ_HEAD(, VPData) iforwards;
+static QTAILQ_HEAD(, VPData) oforwards;
+static QTAILQ_HEAD(, VPData) channels;
+
+static void usage(const char *cmd)
+{
+    printf(
+"Usage: %s -c <channel_opts> [-c ... ] [-i <iforward_opts> ...] "
+"[-o <oforward_opts> ...]\n"
+"QEMU virt-proxy communication channel\n"
+"\n"
+"  -c, --channel    channel options of the form:\n"
+"                   <method>:<addr>:<port>[:channel_id]\n"
+"  -o, --oforward   oforward options of the form:\n"
+"                   <service_id>:<addr>:<port>[:channel_id]\n"
+"  -i, --iforward   iforward options of the form:\n"
+"                   <service_id>:<addr>:<port>[:channel_id]\n"
+"  -v, --verbose    display extra debugging information\n"
+"  -h, --help       display this help and exit\n"
+"\n"
+"  channels are used to establish a data connection between 2 end-points in\n"
+"  the host or the guest (connection method specified by <method>).\n"
+"  oforwards specify a socket to listen for new connections on, outgoing\n"
+"  data from which is tagged with <service_id> before being sent over the\n"
+"  channel. iforwards specify a socket to route incoming data/connections\n"
+"  with a specific <service_id> to. The positional parameters for\n"
+"  channels/iforwards/oforwards are:\n"
+"\n"
+"  <method>:     one of unix-connect, unix-listen, tcp-connect, tcp-listen,\n"
+"                virtserial-open\n"
+"  <addr>:       path of unix socket or virtserial port, or IP of host, to\n"
+"                connect/bind to\n"
+"  <port>:       port to bind/connect to, or '-' if addr is a path\n"
+"  <service_id>: an identifier used to properly route connections to the\n"
+"                corresponding host or guest daemon socket.\n"
+"  <channel_id>: numerical id to identify what channel to use for an iforward\n"
+"                or oforward. (default is 0)\n"
+"\n"
+"Report bugs to <mdroth@linux.vnet.ibm.com>\n"
+    , cmd);
+}
+
+static VPDriver *get_channel_drv(int index) {
+    VPData *data;
+    VPDriver *drv;
+    int cindex;
+
+    QTAILQ_FOREACH(data, &channels, next) {
+        cindex = qemu_opt_get_number(data->opts, "index", 0);
+        if (cindex == index) {
+            drv = data->opaque;
+            return drv;
+        }
+    }
+
+    return NULL;
+}
+
+static int init_channels(void) {
+    VPDriver *drv;
+    VPData *channel_data;
+    const char *channel_method, *path;
+    int fd, ret;
+    bool listen;
+
+    if (QTAILQ_EMPTY(&channels)) {
+        warnx("no channel specified");
+        return -1;
+    }
+
+    channel_data = QTAILQ_FIRST(&channels);
+
+    /* TODO: add this support, optional idx param for -i/-o/-c
+     * args should suffice
+     */
+    if (QTAILQ_NEXT(channel_data, next) != NULL) {
+        warnx("multiple channels not currently supported, defaulting to first");
+    }
+
+    INFO("initializing channel...");
+    if (verbose_enabled) {
+        qemu_opts_print(channel_data->opts, NULL);
+    }
+
+    channel_method = qemu_opt_get(channel_data->opts, "channel_method");
+
+    if (strcmp(channel_method, "tcp-listen") == 0) {
+        fd = inet_listen_opts(channel_data->opts, 0);
+        listen = true;
+    } else if (strcmp(channel_method, "tcp-connect") == 0) {
+        fd = inet_connect_opts(channel_data->opts);
+        listen = false;
+    } else if (strcmp(channel_method, "unix-listen") == 0) {
+        fd = unix_listen_opts(channel_data->opts);
+        listen = true;
+    } else if (strcmp(channel_method, "unix-connect") == 0) {
+        fd = unix_connect_opts(channel_data->opts);
+        listen = false;
+    } else if (strcmp(channel_method, "virtserial-open") == 0) {
+        path = qemu_opt_get(channel_data->opts, "path");
+        fd = qemu_open(path, O_RDWR);
+        ret = fcntl(fd, F_GETFL);
+        ret = fcntl(fd, F_SETFL, ret | O_ASYNC);
+        if (ret < 0) {
+            warn("error setting flags for fd");
+            return -1;
+        }
+        listen = false;
+    } else {
+        warnx("invalid channel type: %s", channel_method);
+        return -1;
+    }
+
+    if (fd == -1) {
+        warn("error opening connection");
+        return -1;
+    }
+
+    drv = vp_new(VP_CTX_FD, NULL, fd, listen);
+    channel_data->opaque = drv;
+
+    return 0;
+}
+
+static int init_oforwards(void) {
+    VPDriver *drv;
+    VPData *oforward_data;
+    int index, ret, fd;
+    const char *service_id;
+
+    QTAILQ_FOREACH(oforward_data, &oforwards, next) {
+        INFO("initializing oforward...");
+        if (verbose_enabled) {
+            qemu_opts_print(oforward_data->opts, NULL);
+        }
+
+        index = qemu_opt_get_number(oforward_data->opts, "index", 0);
+        drv = get_channel_drv(index);
+        if (drv == NULL) {
+            warnx("unable to find channel with index: %d", index);
+            return -1;
+        }
+
+        if (qemu_opt_get(oforward_data->opts, "host") != NULL) {
+            fd = inet_listen_opts(oforward_data->opts, 0);
+        } else if (qemu_opt_get(oforward_data->opts, "path") != NULL) {
+            fd = unix_listen_opts(oforward_data->opts);
+        } else {
+            warnx("unable to find listening socket host/addr info");
+            return -1;
+        }
+
+        if (fd == -1) {
+            warnx("failed to create FD");
+            return -1;
+        }
+
+        service_id = qemu_opt_get(oforward_data->opts, "service_id");
+
+        if (service_id == NULL) {
+            warnx("no service_id specified");
+            return -1;
+        }
+
+        ret = vp_set_oforward(drv, fd, service_id);
+    }
+
+    return 0;
+}
+
+static int init_iforwards(void) {
+    VPDriver *drv;
+    VPData *iforward_data;
+    int index, ret;
+    const char *service_id, *addr, *port;
+    bool ipv6;
+
+    QTAILQ_FOREACH(iforward_data, &iforwards, next) {
+        INFO("initializing iforward...");
+        if (verbose_enabled) {
+            qemu_opts_print(iforward_data->opts, NULL);
+        }
+
+        index = qemu_opt_get_number(iforward_data->opts, "index", 0);
+        drv = get_channel_drv(index);
+        if (drv == NULL) {
+            warnx("unable to find channel with index: %d", index);
+            return -1;
+        }
+
+        service_id = qemu_opt_get(iforward_data->opts, "service_id");
+        if (service_id == NULL) {
+            warnx("no service_id specified");
+            return -1;
+        }
+
+        addr = qemu_opt_get(iforward_data->opts, "path");
+        port = NULL;
+
+        if (addr == NULL) {
+            /* map service to a network socket instead */
+            addr = qemu_opt_get(iforward_data->opts, "host");
+            port = qemu_opt_get(iforward_data->opts, "port");
+        }
+
+        ipv6 = qemu_opt_get_bool(iforward_data->opts, "ipv6", 0) ?
+               true : false;
+
+        ret = vp_set_iforward(drv, service_id, addr, port, ipv6);
+        if (ret != 0) {
+            warnx("error adding iforward");
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+int main(int argc, char **argv)
+{
+    const char *sopt = "hVvi:o:c:";
+    struct option lopt[] = {
+        { "help", 0, NULL, 'h' },
+        { "version", 0, NULL, 'V' },
+        { "verbose", 0, NULL, 'v' },
+        { "iforward", 0, NULL, 'i' },
+        { "oforward", 0, NULL, 'o' },
+        { "channel", 0, NULL, 'c' },
+        { NULL, 0, NULL, 0 }
+    };
+    int opt_ind = 0, ch, ret;
+    QTAILQ_INIT(&iforwards);
+    QTAILQ_INIT(&oforwards);
+    QTAILQ_INIT(&channels);
+
+    while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
+        QemuOpts *opts;
+        VPData *data;
+        switch (ch) {
+        case 'i':
+            opts = qemu_opts_create(&vp_opts, NULL, 0);
+            ret = vp_parse(opts, optarg, 0);
+            if (ret) {
+                errx(EXIT_FAILURE, "error parsing arg: %s", optarg);
+            }
+            data = qemu_mallocz(sizeof(VPData));
+            data->opts = opts;
+            QTAILQ_INSERT_TAIL(&iforwards, data, next);
+            break;
+        case 'o':
+            opts = qemu_opts_create(&vp_opts, NULL, 0);
+            ret = vp_parse(opts, optarg, 0);
+            if (ret) {
+                errx(EXIT_FAILURE, "error parsing arg: %s", optarg);
+            }
+            data = qemu_mallocz(sizeof(VPData));
+            data->opts = opts;
+            QTAILQ_INSERT_TAIL(&oforwards, data, next);
+            break;
+        case 'c':
+            opts = qemu_opts_create(&vp_opts, NULL, 0);
+            ret = vp_parse(opts, optarg, 1);
+            if (ret) {
+                errx(EXIT_FAILURE, "error parsing arg: %s", optarg);
+            }
+            data = qemu_mallocz(sizeof(VPData));
+            data->opts = opts;
+            QTAILQ_INSERT_TAIL(&channels, data, next);
+            break;
+        case 'v':
+            verbose_enabled = 1;
+            break;
+        case 'h':
+            usage(argv[0]);
+            return 0;
+        case '?':
+            errx(EXIT_FAILURE, "Try '%s --help' for more information.",
+                 argv[0]);
+        }
+    }
+
+    ret = init_channels();
+    if (ret) {
+        errx(EXIT_FAILURE, "error initializing communication channel");
+    }
+
+    ret = init_oforwards();
+    if (ret) {
+        errx(EXIT_FAILURE,
+             "error initializing forwarders for outgoing connections");
+    }
+
+    ret = init_iforwards();
+    if (ret) {
+        errx(EXIT_FAILURE,
+             "error initializing service mappings for incoming connections");
+    }
+
+    /* main i/o loop */
+    for (;;) {
+        DEBUG("entering main_loop_wait()");
+        main_loop_wait(0);
+        DEBUG("left main_loop_wait()");
+    }
+
+    return 0;
+}
diff --git a/virtproxy.c b/virtproxy.c
index 78cda04..336c39f 100644
--- a/virtproxy.c
+++ b/virtproxy.c
@@ -164,30 +164,6 @@ struct VPDriver {
     QLIST_HEAD(, VPConn) conns;
 };
 
-static QemuOptsList vp_socket_opts = {
-    .name = "vp_socket_opts",
-    .head = QTAILQ_HEAD_INITIALIZER(vp_socket_opts.head),
-    .desc = {
-        {
-            .name = "path",
-            .type = QEMU_OPT_STRING,
-        },{
-            .name = "host",
-            .type = QEMU_OPT_STRING,
-        },{
-            .name = "port",
-            .type = QEMU_OPT_STRING,
-        },{
-            .name = "ipv4",
-            .type = QEMU_OPT_BOOL,
-        },{
-            .name = "ipv6",
-            .type = QEMU_OPT_BOOL,
-        },
-        { /* end if list */ }
-    },
-};
-
 static void vp_channel_read(void *opaque);
 
 static int vp_channel_send_all(VPDriver *drv, uint8_t *buf, int count)
-- 
1.7.0.4