[libvirt] [PATCH revision RFC 1/2] lxc: Fix return values of veth.c functions
Laine Stump
laine at laine.org
Thu Jul 29 16:18:23 UTC 2010
From: Ryota Ozaki <ozaki.ryota at gmail.com>
Previously, the functions in src/lxc/veth.c could sometimes return
positive values on failure rather than -1. This made accurate error
reporting difficult, and led to one failure to catch an error in a
calling function.
This patch makes all the functions in veth.c consistently return 0 on
success, and -1 on failure. It also fixes up the callers to the veth.c
functions where necessary.
Note that this patch may be related to the bug:
https://bugzilla.redhat.com/show_bug.cgi?id=607496.
It would not fix the bug, but would unveil what happens.
* po/POTFILES.in - add veth.c, which previously had no translatable strings
* src/lxc/lxc_controller.c
* src/lxc/lxc_container.c
* src/lxc/lxc_driver.c - fixup callers to veth.c, and remove error logs,
as they are now done in veth.c
* src/lxc/veth.c - make all functions consistently return -1 on error.
* src/lxc/veth.h - use ATTRIBUTE_NONNULL to protect against NULL args.
---
po/POTFILES.in | 1 +
src/lxc/lxc_container.c | 12 +----
src/lxc/lxc_controller.c | 11 +----
src/lxc/lxc_driver.c | 22 +++------
src/lxc/veth.c | 117 ++++++++++++++++++++++++++-------------------
src/lxc/veth.h | 19 +++++--
6 files changed, 94 insertions(+), 88 deletions(-)
diff --git a/po/POTFILES.in b/po/POTFILES.in
index dad1f8d..8a148f3 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -33,6 +33,7 @@ src/lxc/lxc_container.c
src/lxc/lxc_conf.c
src/lxc/lxc_controller.c
src/lxc/lxc_driver.c
+src/lxc/veth.c
src/network/bridge_driver.c
src/node_device/node_device_driver.c
src/node_device/node_device_hal.c
diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 4371dba..b19192f 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -255,20 +255,14 @@ static int lxcContainerRenameAndEnableInterfaces(unsigned int nveths,
DEBUG("Renaming %s to %s", veths[i], newname);
rc = setInterfaceName(veths[i], newname);
- if (0 != rc) {
- VIR_ERROR(_("Failed to rename %s to %s (%d)"),
- veths[i], newname, rc);
- rc = -1;
+ if (rc < 0)
goto error_out;
- }
DEBUG("Enabling %s", newname);
rc = vethInterfaceUpOrDown(newname, 1);
- if (0 != rc) {
- VIR_ERROR(_("Failed to enable %s (%d)"), newname, rc);
- rc = -1;
+ if (rc < 0)
goto error_out;
- }
+
VIR_FREE(newname);
}
diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index d8b7bc7..7dc51a5 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -477,12 +477,8 @@ static int lxcControllerMoveInterfaces(unsigned int nveths,
{
unsigned int i;
for (i = 0 ; i < nveths ; i++)
- if (moveInterfaceToNetNs(veths[i], container) < 0) {
- lxcError(VIR_ERR_INTERNAL_ERROR,
- _("Failed to move interface %s to ns %d"),
- veths[i], container);
+ if (moveInterfaceToNetNs(veths[i], container) < 0)
return -1;
- }
return 0;
}
@@ -502,10 +498,7 @@ static int lxcControllerCleanupInterfaces(unsigned int nveths,
{
unsigned int i;
for (i = 0 ; i < nveths ; i++)
- if (vethDelete(veths[i]) < 0)
- lxcError(VIR_ERR_INTERNAL_ERROR,
- _("Failed to delete veth: %s"), veths[i]);
- /* will continue to try to cleanup any other interfaces */
+ vethDelete(veths[i]);
return 0;
}
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 4fc1ecd..614548e 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -859,11 +859,10 @@ static int lxcSetupInterfaces(virConnectPtr conn,
strcpy(parentVeth, def->nets[i]->ifname);
}
DEBUG("parentVeth: %s, containerVeth: %s", parentVeth, containerVeth);
- if (0 != (rc = vethCreate(parentVeth, PATH_MAX, containerVeth, PATH_MAX))) {
- lxcError(VIR_ERR_INTERNAL_ERROR,
- _("Failed to create veth device pair: %d"), rc);
+ rc = vethCreate(parentVeth, PATH_MAX, containerVeth, PATH_MAX);
+ if (rc < 0)
goto error_exit;
- }
+
if (NULL == def->nets[i]->ifname) {
def->nets[i]->ifname = strdup(parentVeth);
}
@@ -885,12 +884,9 @@ static int lxcSetupInterfaces(virConnectPtr conn,
{
char macaddr[VIR_MAC_STRING_BUFLEN];
virFormatMacAddr(def->nets[i]->mac, macaddr);
- if (0 != (rc = setMacAddr(containerVeth, macaddr))) {
- virReportSystemError(rc,
- _("Failed to set %s to %s"),
- macaddr, containerVeth);
+ rc = setMacAddr(containerVeth, macaddr);
+ if (rc < 0)
goto error_exit;
- }
}
if (0 != (rc = brAddInterface(brctl, bridge, parentVeth))) {
@@ -900,13 +896,9 @@ static int lxcSetupInterfaces(virConnectPtr conn,
goto error_exit;
}
- if (0 != (rc = vethInterfaceUpOrDown(parentVeth, 1))) {
- virReportSystemError(rc,
- _("Failed to enable %s device"),
- parentVeth);
+ rc = vethInterfaceUpOrDown(parentVeth, 1);
+ if (rc < 0)
goto error_exit;
- }
-
}
rc = 0;
diff --git a/src/lxc/veth.c b/src/lxc/veth.c
index 34f7faa..19f11f2 100644
--- a/src/lxc/veth.c
+++ b/src/lxc/veth.c
@@ -13,12 +13,21 @@
#include <string.h>
#include <stdio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
#include "veth.h"
#include "internal.h"
#include "logging.h"
#include "memory.h"
#include "util.h"
+#include "virterror_internal.h"
+
+#define VIR_FROM_THIS VIR_FROM_LXC
+
+#define vethError(code, ...) \
+ virReportErrorHelper(NULL, VIR_FROM_LXC, code, __FILE__, \
+ __FUNCTION__, __LINE__, __VA_ARGS__)
/* Functions */
/**
@@ -80,13 +89,9 @@ int vethCreate(char* veth1, int veth1MaxLen,
const char *argv[] = {
"ip", "link", "add", veth1, "type", "veth", "peer", "name", veth2, NULL
};
- int cmdResult;
+ int cmdResult = 0;
int vethDev = 0;
- if ((NULL == veth1) || (NULL == veth2)) {
- goto error_out;
- }
-
DEBUG("veth1: %s veth2: %s", veth1, veth2);
while ((1 > strlen(veth1)) || STREQ(veth1, veth2)) {
@@ -104,11 +109,14 @@ int vethCreate(char* veth1, int veth1MaxLen,
DEBUG("veth1: %s veth2: %s", veth1, veth2);
rc = virRun(argv, &cmdResult);
- if (0 == rc) {
- rc = cmdResult;
+ if (rc != 0 ||
+ (WIFEXITED(cmdResult) && WEXITSTATUS(cmdResult) != 0)) {
+ vethError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to create veth device pair '%s', '%s': %d"),
+ veth1, veth2, WEXITSTATUS(cmdResult));
+ rc = -1;
}
-error_out:
return rc;
}
@@ -127,21 +135,23 @@ int vethDelete(const char *veth)
{
int rc = -1;
const char *argv[] = {"ip", "link", "del", veth, NULL};
- int cmdResult;
-
- if (NULL == veth) {
- goto error_out;
- }
+ int cmdResult = 0;
DEBUG("veth: %s", veth);
rc = virRun(argv, &cmdResult);
- if (0 == rc) {
- rc = cmdResult;
+ if (rc != 0 ||
+ (WIFEXITED(cmdResult) && WEXITSTATUS(cmdResult) != 0)) {
+ /*
+ * Prevent overwriting an error log which may be set
+ * where an actual failure occurs.
+ */
+ VIR_DEBUG(_("Failed to delete '%s' (%d)"),
+ veth, WEXITSTATUS(cmdResult));
+ rc = -1;
}
-error_out:
return rc;
}
@@ -159,11 +169,7 @@ int vethInterfaceUpOrDown(const char* veth, int upOrDown)
{
int rc = -1;
const char *argv[] = {"ifconfig", veth, NULL, NULL};
- int cmdResult;
-
- if (NULL == veth) {
- goto error_out;
- }
+ int cmdResult = 0;
if (0 == upOrDown)
argv[2] = "down";
@@ -172,11 +178,22 @@ int vethInterfaceUpOrDown(const char* veth, int upOrDown)
rc = virRun(argv, &cmdResult);
- if (0 == rc) {
- rc = cmdResult;
+ if (rc != 0 ||
+ (WIFEXITED(cmdResult) && WEXITSTATUS(cmdResult) != 0)) {
+ if (0 == upOrDown)
+ /*
+ * Prevent overwriting an error log which may be set
+ * where an actual failure occurs.
+ */
+ VIR_DEBUG(_("Failed to disable '%s' (%d)"),
+ veth, WEXITSTATUS(cmdResult));
+ else
+ vethError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to enable '%s' (%d)"),
+ veth, WEXITSTATUS(cmdResult));
+ rc = -1;
}
-error_out:
return rc;
}
@@ -198,21 +215,23 @@ int moveInterfaceToNetNs(const char* iface, int pidInNs)
const char *argv[] = {
"ip", "link", "set", iface, "netns", NULL, NULL
};
- int cmdResult;
+ int cmdResult = 0;
- if (NULL == iface) {
- goto error_out;
+ if (virAsprintf(&pid, "%d", pidInNs) == -1) {
+ virReportOOMError();
+ return -1;
}
- if (virAsprintf(&pid, "%d", pidInNs) == -1)
- goto error_out;
-
argv[5] = pid;
rc = virRun(argv, &cmdResult);
- if (0 == rc)
- rc = cmdResult;
+ if (rc != 0 ||
+ (WIFEXITED(cmdResult) && WEXITSTATUS(cmdResult) != 0)) {
+ vethError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to move '%s' into NS(pid=%d) (%d)"),
+ iface, pidInNs, WEXITSTATUS(cmdResult));
+ rc = -1;
+ }
-error_out:
VIR_FREE(pid);
return rc;
}
@@ -234,17 +253,17 @@ int setMacAddr(const char* iface, const char* macaddr)
const char *argv[] = {
"ip", "link", "set", iface, "address", macaddr, NULL
};
- int cmdResult;
-
- if (NULL == iface) {
- goto error_out;
- }
+ int cmdResult = 0;
rc = virRun(argv, &cmdResult);
- if (0 == rc)
- rc = cmdResult;
+ if (rc != 0 ||
+ (WIFEXITED(cmdResult) && WEXITSTATUS(cmdResult) != 0)) {
+ vethError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to set '%s' to '%s' (%d)"),
+ macaddr, iface, WEXITSTATUS(cmdResult));
+ rc = -1;
+ }
-error_out:
return rc;
}
@@ -265,16 +284,16 @@ int setInterfaceName(const char* iface, const char* new)
const char *argv[] = {
"ip", "link", "set", iface, "name", new, NULL
};
- int cmdResult;
-
- if (NULL == iface || NULL == new) {
- goto error_out;
- }
+ int cmdResult = 0;
rc = virRun(argv, &cmdResult);
- if (0 == rc)
- rc = cmdResult;
+ if (rc != 0 ||
+ (WIFEXITED(cmdResult) && WEXITSTATUS(cmdResult) != 0)) {
+ vethError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to set '%s' to '%s' (%d)"),
+ new, iface, WEXITSTATUS(cmdResult));
+ rc = -1;
+ }
-error_out:
return rc;
}
diff --git a/src/lxc/veth.h b/src/lxc/veth.h
index 523bf9c..1ec1ec8 100644
--- a/src/lxc/veth.h
+++ b/src/lxc/veth.h
@@ -13,14 +13,21 @@
# define VETH_H
# include <config.h>
+# include "internal.h"
/* Function declarations */
int vethCreate(char* veth1, int veth1MaxLen, char* veth2,
- int veth2MaxLen);
-int vethDelete(const char* veth);
-int vethInterfaceUpOrDown(const char* veth, int upOrDown);
-int moveInterfaceToNetNs(const char *iface, int pidInNs);
-int setMacAddr(const char* iface, const char* macaddr);
-int setInterfaceName(const char* iface, const char* new);
+ int veth2MaxLen)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(3);
+int vethDelete(const char* veth)
+ ATTRIBUTE_NONNULL(1);
+int vethInterfaceUpOrDown(const char* veth, int upOrDown)
+ ATTRIBUTE_NONNULL(1);
+int moveInterfaceToNetNs(const char *iface, int pidInNs)
+ ATTRIBUTE_NONNULL(1);
+int setMacAddr(const char* iface, const char* macaddr)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+int setInterfaceName(const char* iface, const char* new)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
#endif /* VETH_H */
--
1.7.1.1
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