[PATCH 2 of 6] xl: network-list command

[Eric Chanudet <eric.chanudet@citrix.com>]

This patch adds network-list command to xl.

Usage: xl network-list <Domain(s)>

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1505,6 +1505,66 @@ int libxl_device_nic_del(struct libxl_ct
     return libxl_device_del(ctx, &device, wait);
 }
 
+libxl_nicinfo *libxl_list_nics(struct libxl_ctx *ctx, uint32_t domid, unsigned int *nb)
+{
+    char *dompath, *nic_path_fe;
+    char **l;
+    char *val, *tok;
+    unsigned int nb_nics, i;
+    libxl_nicinfo *res, *nics;
+
+    dompath = libxl_xs_get_dompath(ctx, domid);
+    if (!dompath) {
+        return NULL;
+    }
+    l = libxl_xs_directory(ctx, XBT_NULL,
+                           libxl_sprintf(ctx, "%s/device/vif", dompath), &nb_nics);
+    if (!l) {
+        return NULL;
+    }
+    res = libxl_calloc(ctx, nb_nics, sizeof (libxl_device_nic));
+    if (!res) {
+        libxl_free(ctx, l);
+        return NULL;
+    }
+    nics = res;
+    for (*nb = nb_nics; nb_nics > 0; --nb_nics, ++l, ++nics) {
+        nic_path_fe = libxl_sprintf(ctx, "%s/device/vif/%s", dompath, *l);
+
+        nics->backend = libxl_xs_read(ctx, XBT_NULL,
+                                      libxl_sprintf(ctx, "%s/backend", nic_path_fe));
+        val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/backend-id", nic_path_fe));
+        nics->backend_id = val ? strtoul(val, NULL, 10) : -1;
+
+        nics->devid = strtoul(*l, NULL, 10);
+        val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/state", nic_path_fe));
+        nics->state = val ? strtoul(val, NULL, 10) : -1;
+        val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/mac", nic_path_fe));
+        for (i = 0, tok = strtok(val, ":"); tok && (i < 6);
+             ++i, tok = strtok(NULL, ":")) {
+            nics->mac[i] = strtoul(tok, NULL, 16);
+        }
+        val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/event-channel", nic_path_fe));
+        nics->evtch = val ? strtol(val, NULL, 10) : -1;
+        val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/tx-ring-ref", nic_path_fe));
+        nics->rref_tx = val ? strtol(val, NULL, 10) : -1;
+        val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/rx-ring-ref", nic_path_fe));
+        nics->rref_rx = val ? strtol(val, NULL, 10) : -1;
+        nics->frontend = libxl_xs_read(ctx, XBT_NULL,
+                                       libxl_sprintf(ctx, "%s/frontend", nics->backend));
+        val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/frontend-id", nics->backend));
+        nics->frontend_id = val ? strtoul(val, NULL, 10) : -1;
+        nics->script = libxl_xs_read(ctx, XBT_NULL,
+                                     libxl_sprintf(ctx, "%s/script", nics->backend));
+
+        libxl_free(ctx, nic_path_fe);
+    }
+
+    libxl_free(ctx, l);
+    return res;
+}
+
+
 /******************************************************************************/
 int libxl_device_console_add(struct libxl_ctx *ctx, uint32_t domid, libxl_device_console *console)
 {
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -372,8 +372,23 @@ int libxl_device_disk_del(struct libxl_c
 libxl_device_disk *libxl_device_disk_list(struct libxl_ctx *ctx, uint32_t domid, int *num);
 int libxl_cdrom_insert(struct libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk);
 
+typedef struct {
+    char *backend;
+    uint32_t backend_id;
+    char *frontend;
+    uint32_t frontend_id;
+    int devid;
+    int state;
+    char *script;
+    uint8_t mac[6];
+    int evtch;
+    int rref_tx;
+    int rref_rx;
+} libxl_nicinfo;
+
 int libxl_device_nic_add(struct libxl_ctx *ctx, uint32_t domid, libxl_device_nic *nic);
 int libxl_device_nic_del(struct libxl_ctx *ctx, libxl_device_nic *nic, int wait);
+libxl_nicinfo *libxl_list_nics(struct libxl_ctx *ctx, uint32_t domid, unsigned int *nb);
 
 int libxl_device_console_add(struct libxl_ctx *ctx, uint32_t domid, libxl_device_console *console);
 
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -3141,3 +3141,51 @@ int main_networkattach(int argc, char **
     }
     exit(0);
 }
+
+int main_networklist(int argc, char **argv)
+{
+    int opt;
+    libxl_nicinfo *nics;
+    unsigned int nb;
+
+    if (argc < 2) {
+        help("network-list");
+        exit(1);
+    }
+    while ((opt = getopt(argc, argv, "hl")) != -1) {
+        switch (opt) {
+            case 'h':
+                help("network-list");
+                exit(0);
+            default:
+                fprintf(stderr, "option `%c' not supported.\n", opt);
+                break;
+        }
+    }
+
+    /*      Idx  BE   MAC   Hdl  Sta  evch txr/rxr  BE-path */
+    printf("%-3s %-2s %-17s %-6s %-5s %-6s %5s/%-5s %-30s\n",
+           "Idx", "BE", "Mac Addr.", "handle", "state", "evt-ch", "tx-", "rx-ring-ref", "BE-path");
+    for (++argv, --argc; argc > 0; --argc, ++argv) {
+        if (domain_qualifier_to_domid(*argv, &domid, 0) < 0) {
+            fprintf(stderr, "%s is an invalid domain identifier\n", *argv);
+            continue;
+        }
+        if (!(nics = libxl_list_nics(&ctx, domid, &nb))) {
+            continue;
+        }
+        for (; nb > 0; --nb, ++nics) {
+            /* Idx BE */
+            printf("%-3d %-2d ", nics->devid, nics->backend_id);
+            /* MAC */
+            printf("%02x:%02x:%02x:%02x:%02x:%02x ",
+                   nics->mac[0], nics->mac[1], nics->mac[2],
+                   nics->mac[3], nics->mac[4], nics->mac[5]);
+            /* Hdl  Sta  evch txr/rxr  BE-path */
+            printf("%6d %5d %6d %5d/%-11d %-30s\n",
+                   nics->devid, nics->state, nics->evtch,
+                   nics->rref_tx, nics->rref_rx, nics->backend);
+        }
+    }
+    exit(0);
+}
diff --git a/tools/libxl/xl_cmdimpl.h b/tools/libxl/xl_cmdimpl.h
--- a/tools/libxl/xl_cmdimpl.h
+++ b/tools/libxl/xl_cmdimpl.h
@@ -40,5 +40,6 @@ int main_domname(int argc, char **argv);
 int main_rename(int argc, char **argv);
 int main_trigger(int argc, char **argv);
 int main_networkattach(int argc, char **argv);
+int main_networklist(int argc, char **argv);
 
 void help(char *command);
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -176,6 +176,10 @@ struct cmd_spec cmd_table[] = {
       &main_networkattach,
       "Create a new virtual network device"
     },
+    { "network-list",
+      &main_networklist,
+      "List virtual network interfaces for a domain"
+    },
 };
 
 int cmdtable_len = sizeof(cmd_table)/sizeof(struct cmd_spec);