[libvirt] [PATCH] virConnectGetHostname: return a fully qualified hostname
David Lutterkort
lutter at redhat.com
Thu Dec 11 21:24:27 UTC 2008
Here is a revised patch that addresses all the comments from Jim and
Dan:
* Use getaddrinfo instead of gethostbyname
* Terminate hostname explicitly with NUL_TERMINATE
* Do not repeat constant HOST_NAME_MAX+1
* Use tabs, not spaces in libvirt_sym.version.in
David
>From 65bee217eb80a3be39f80a7c229305180e5786c6 Mon Sep 17 00:00:00 2001
From: David Lutterkort <lutter at redhat.com>
Date: Wed, 10 Dec 2008 18:34:39 -0800
Subject: [PATCH] virConnectGetHostname: return a fully qualified hostname
Instead of doing the equivalent of 'hostname', do 'hostname --fqdn',
i.e. try to qualify the local host name by an additional call to
getaddrinfo(3)
---
src/libvirt_sym.version.in | 1 +
src/qemu_driver.c | 16 ++++------------
src/test.c | 16 +++++-----------
src/uml_driver.c | 15 ++++-----------
src/util.c | 33 +++++++++++++++++++++++++++++++++
src/util.h | 2 ++
src/xen_unified.c | 15 +++++----------
7 files changed, 54 insertions(+), 44 deletions(-)
diff --git a/src/libvirt_sym.version.in b/src/libvirt_sym.version.in
index de0bc4a..71a47b7 100644
--- a/src/libvirt_sym.version.in
+++ b/src/libvirt_sym.version.in
@@ -594,6 +594,7 @@ LIBVIRT_PRIVATE_ at VERSION@ {
virFileReadLimFD;
virFileReadPid;
virFileLinkPointsTo;
+ virGetHostname;
virParseNumber;
virRun;
virSkipSpaces;
diff --git a/src/qemu_driver.c b/src/qemu_driver.c
index 5f6fbd1..d6b7515 100644
--- a/src/qemu_driver.c
+++ b/src/qemu_driver.c
@@ -1562,23 +1562,16 @@ cleanup:
static char *
qemudGetHostname (virConnectPtr conn)
{
- int r;
- char hostname[HOST_NAME_MAX+1], *str;
+ char *result;
- r = gethostname (hostname, HOST_NAME_MAX+1);
- if (r == -1) {
+ result = virGetHostname();
+ if (result == NULL) {
qemudReportError (conn, NULL, NULL, VIR_ERR_SYSTEM_ERROR,
"%s", strerror (errno));
return NULL;
}
/* Caller frees this string. */
- str = strdup (hostname);
- if (str == NULL) {
- qemudReportError (conn, NULL, NULL, VIR_ERR_SYSTEM_ERROR,
- "%s", strerror (errno));
- return NULL;
- }
- return str;
+ return result;
}
static int qemudListDomains(virConnectPtr conn, int *ids, int nids) {
@@ -4249,4 +4242,3 @@ int qemuRegister(void) {
virRegisterStateDriver(&qemuStateDriver);
return 0;
}
-
diff --git a/src/test.c b/src/test.c
index 257fc8a..cb623ed 100644
--- a/src/test.c
+++ b/src/test.c
@@ -651,22 +651,16 @@ static int testGetVersion(virConnectPtr conn ATTRIBUTE_UNUSED,
static char *testGetHostname (virConnectPtr conn)
{
- int r;
- char hostname [HOST_NAME_MAX+1], *str;
+ char *result;
- r = gethostname (hostname, HOST_NAME_MAX+1);
- if (r == -1) {
+ result = virGetHostname();
+ if (result == NULL) {
testError (conn, VIR_ERR_SYSTEM_ERROR, "%s",
strerror (errno));
return NULL;
}
- str = strdup (hostname);
- if (str == NULL) {
- testError (conn, VIR_ERR_SYSTEM_ERROR, "%s",
- strerror (errno));
- return NULL;
- }
- return str;
+ /* Caller frees this string. */
+ return result;
}
static int testGetMaxVCPUs(virConnectPtr conn ATTRIBUTE_UNUSED,
diff --git a/src/uml_driver.c b/src/uml_driver.c
index 408096e..52a4e5b 100644
--- a/src/uml_driver.c
+++ b/src/uml_driver.c
@@ -1150,23 +1150,16 @@ cleanup:
static char *
umlGetHostname (virConnectPtr conn)
{
- int r;
- char hostname[HOST_NAME_MAX+1], *str;
+ char *result;
- r = gethostname (hostname, HOST_NAME_MAX+1);
- if (r == -1) {
+ result = virGetHostname();
+ if (result == NULL) {
umlReportError (conn, NULL, NULL, VIR_ERR_SYSTEM_ERROR,
"%s", strerror (errno));
return NULL;
}
/* Caller frees this string. */
- str = strdup (hostname);
- if (str == NULL) {
- umlReportError (conn, NULL, NULL, VIR_ERR_SYSTEM_ERROR,
- "%s", strerror (errno));
- return NULL;
- }
- return str;
+ return result;
}
static int umlListDomains(virConnectPtr conn, int *ids, int nids) {
diff --git a/src/util.c b/src/util.c
index da26009..c5e406b 100644
--- a/src/util.c
+++ b/src/util.c
@@ -47,6 +47,7 @@
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
+#include <netdb.h>
#include "virterror_internal.h"
#include "logging.h"
@@ -1306,3 +1307,35 @@ int virDiskNameToIndex(const char *name) {
return idx;
}
+
+#ifndef AI_CANONIDN
+#define AI_CANONIDN 0
+#endif
+
+char *virGetHostname(void)
+{
+ int r;
+ char hostname[HOST_NAME_MAX+1], *result;
+ struct addrinfo hints, *info;
+
+ r = gethostname (hostname, sizeof(hostname));
+ if (r == -1)
+ return NULL;
+ NUL_TERMINATE(hostname);
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_flags = AI_CANONNAME|AI_CANONIDN;
+ hints.ai_family = AF_UNSPEC;
+ r = getaddrinfo(hostname, NULL, &hints, &info);
+ if (r != 0)
+ return NULL;
+ if (info->ai_canonname == NULL) {
+ freeaddrinfo(info);
+ return NULL;
+ }
+
+ /* Caller frees this string. */
+ result = strdup (info->ai_canonname);
+ freeaddrinfo(info);
+ return result;
+}
diff --git a/src/util.h b/src/util.h
index 0748cbf..f85a61e 100644
--- a/src/util.h
+++ b/src/util.h
@@ -161,4 +161,6 @@ static inline int getuid (void) { return 0; }
static inline int getgid (void) { return 0; }
#endif
+char *virGetHostname(void);
+
#endif /* __VIR_UTIL_H__ */
diff --git a/src/xen_unified.c b/src/xen_unified.c
index a60bc79..dbda3b5 100644
--- a/src/xen_unified.c
+++ b/src/xen_unified.c
@@ -447,20 +447,15 @@ xenUnifiedGetVersion (virConnectPtr conn, unsigned long *hvVer)
static char *
xenUnifiedGetHostname (virConnectPtr conn)
{
- int r;
- char hostname [HOST_NAME_MAX+1], *str;
+ char *result;
- r = gethostname (hostname, HOST_NAME_MAX+1);
- if (r == -1) {
- xenUnifiedError (conn, VIR_ERR_SYSTEM_ERROR, "%s", strerror(errno));
- return NULL;
- }
- str = strdup (hostname);
- if (str == NULL) {
+ result = virGetHostname();
+ if (result == NULL) {
xenUnifiedError (conn, VIR_ERR_SYSTEM_ERROR, "%s", strerror(errno));
return NULL;
}
- return str;
+ /* Caller frees this string. */
+ return result;
}
static int
--
1.6.0.4
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