From: kremlin <ian@kremlin.cc>
Date: Wed, 6 Aug 2014 10:43:46 +0000 (-0500)
Subject: add WIP bit of chassis detection for hostnamed
X-Git-Tag: gsoc-final~39
X-Git-Url: https://uglyman.kremlin.cc/gitweb/gitweb.cgi?p=systembsd.git;a=commitdiff_plain;h=f1ad9351b337c4725eafae245abb6dff96f02956

add WIP bit of chassis detection for hostnamed

hostnamed checks sysctl output for known vm indicators
---

diff --git a/src/interfaces/hostnamed/hostnamed.c b/src/interfaces/hostnamed/hostnamed.c
index 87401f1..075a7f3 100644
--- a/src/interfaces/hostnamed/hostnamed.c
+++ b/src/interfaces/hostnamed/hostnamed.c
@@ -19,6 +19,7 @@
 #include <signal.h>
 
 #include <sys/param.h>
+#include <sys/sysctl.h>
 #include <string.h>
 
 #include <glib/gprintf.h>
@@ -37,6 +38,16 @@ gboolean dbus_interface_exported; /* reliable because of gdbus operational guara
 
 /* --- begin method/property/dbus signal code --- */
 
+/* add any sysctl strings that suggest virtualization here */
+const gchar* vmstring_list[] = { 
+    "QEMU Virtual CPU",
+    "SmartDC HVM",
+    "KVM",
+    "VirtualBox"
+};
+
+static gboolean is_vm;
+
 static gboolean
 on_handle_set_hostname(Hostname1 *hn1_passed_interf,
                        GDBusMethodInvocation *invoc,
@@ -129,10 +140,12 @@ our_get_pretty_hostname() {
     GKeyFile *config;
     gchar *ret;
 
+    config = g_key_file_new();
+
     if(g_key_file_load_from_file(config, "/etc/systemd_compat.conf", G_KEY_FILE_NONE, NULL)
         && (ret = g_key_file_get_value(config, "hostnamed", "PrettyHostname", NULL))) { /* ret might need to be freed, docs dont specify but i am suspicious */
 
-        g_free(config);
+        g_key_file_unref(config);
         return ret;
     }
 
@@ -145,7 +158,30 @@ our_get_pretty_hostname() {
 const gchar *
 our_get_chassis() {
 
-    return "TODO";
+    char *hwproduct, *hwmodel;
+    size_t hwproduct_size, hwmodel_size;
+    int hwproduct_name[2], hwmodel_name[2];
+
+    hwproduct_name[0] = CTL_HW;
+    hwproduct_name[1] = HW_PRODUCT;
+
+    hwmodel_name[0] = CTL_HW;
+    hwmodel_name[1] = HW_MODEL;
+
+    /* pass NULL buffer to check size first, then pass hw to be filled according to freshly-set hw_size */
+    if(sysctl(&hwproduct_name, 2, NULL, &hwproduct_size, NULL, 0) || sysctl(&hwproduct_name, 2, hwproduct, &hwproduct_size, NULL, 0))
+        return "desktop"; /* TODO error properly here */
+
+    if(sysctl(&hwmodel_name, 2, NULL, &hwmodel_size, NULL, 0) || sysctl(&hwmodel_name, 2, hwmodel, &hwmodel_size, NULL, 0))
+        return "desktop"; /* TODO error properly here */
+
+    if(test_against_known_vm_strings(hwproduct) || test_against_known_vm_strings(hwmodel))
+        return "vm"; /*TODO differentiate between VMs (hardware virt, seperate kernel) and containers (paravirt, shared kernel)
+
+    /* TODO: test for laptop, if not, dmidecode for desktop vs. server
+     *       probably move this code to vm test func and set a global after running it early, once */
+
+    return "desktop";
 }
 
 const gchar *
@@ -316,6 +352,20 @@ int main() {
     return 0;
 }
 
+gboolean test_against_known_vm_strings(gchar *sysctl_string) {
+
+    unsigned int i;
+
+    if(is_vm)
+        return TRUE;
+
+    for(; i < G_N_ELEMENTS(vmstring_list); i++)
+        if(strcasestr(sysctl_string, vmstring_list[i]))
+            return (is_vm = TRUE) ? TRUE : FALSE;
+
+         return FALSE;
+}
+
 /* TODO figure out DMI variables on obsd */
 /*static gchar *guess_icon_name() {
 
diff --git a/src/interfaces/hostnamed/hostnamed.h b/src/interfaces/hostnamed/hostnamed.h
index 590a783..a3cc366 100644
--- a/src/interfaces/hostnamed/hostnamed.h
+++ b/src/interfaces/hostnamed/hostnamed.h
@@ -17,3 +17,5 @@
 void hostnamed_mem_clean();
 
 const gchar *our_get_pretty_hostname();
+
+gboolean test_against_known_vm_strings(gchar* sysctl);