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[libvirt] [PATCH 2/2] Cleanup "/sys/class/net" usage



Throughout the code, we have several places need to construct a path
somewhere in /sys/class/net/... They are not consistent and nearly
each code piece invents its own way how to do it. So unify this by:

1) use virNetDevSysfsFile() wherever possible

2) At least use common macro SYSFS_NET_DIR declared in virnetdev.h at
   the rest of places which can't go with 1)

Signed-off-by: Michal Privoznik <mprivozn redhat com>
---
 src/Makefile.am                   |  4 ++--
 src/parallels/parallels_network.c |  3 +--
 src/util/virnetdev.c              |  5 ++---
 src/util/virnetdev.h              |  2 ++
 src/util/virnetdevbridge.c        |  1 -
 src/util/virnetdevmacvlan.c       | 28 ++++++++++++++--------------
 6 files changed, 21 insertions(+), 22 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index 91a4c17..3c9eac6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1383,8 +1383,8 @@ noinst_LTLIBRARIES += libvirt_driver_parallels.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_parallels.la
 libvirt_driver_parallels_la_CFLAGS = \
 		-I$(srcdir)/conf $(AM_CFLAGS) \
-		$(PARALLELS_SDK_CFLAGS)
-libvirt_driver_parallels_la_LIBADD = $(PARALLELS_SDK_LIBS)
+		$(PARALLELS_SDK_CFLAGS) $(LIBNL_CFLAGS)
+libvirt_driver_parallels_la_LIBADD = $(PARALLELS_SDK_LIBS) $(LIBNL_LIBS)
 libvirt_driver_parallels_la_SOURCES = $(PARALLELS_DRIVER_SOURCES)
 endif WITH_PARALLELS
 
diff --git a/src/parallels/parallels_network.c b/src/parallels/parallels_network.c
index 47f4886..47353a7 100644
--- a/src/parallels/parallels_network.c
+++ b/src/parallels/parallels_network.c
@@ -28,6 +28,7 @@
 #include "viralloc.h"
 #include "virerror.h"
 #include "virfile.h"
+#include "virnetdev.h"
 #include "md5.h"
 #include "parallels_utils.h"
 #include "virstring.h"
@@ -39,8 +40,6 @@
     virReportErrorHelper(VIR_FROM_TEST, VIR_ERR_OPERATION_FAILED, __FILE__,    \
                      __FUNCTION__, __LINE__, _("Can't parse prlctl output"))
 
-#define SYSFS_NET_DIR "/sys/class/net"
-
 static int parallelsGetBridgedNetInfo(virNetworkDefPtr def, virJSONValuePtr jobj)
 {
     const char *ifname;
diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index 9ef75f2..a816e5d 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -1612,14 +1612,13 @@ int virNetDevValidateConfig(const char *ifname ATTRIBUTE_UNUSED,
 
 
 #ifdef __linux__
-# define NET_SYSFS "/sys/class/net/"
 
 int
 virNetDevSysfsFile(char **pf_sysfs_device_link, const char *ifname,
                    const char *file)
 {
 
-    if (virAsprintf(pf_sysfs_device_link, NET_SYSFS "%s/%s", ifname, file) < 0)
+    if (virAsprintf(pf_sysfs_device_link, SYSFS_NET_DIR "%s/%s", ifname, file) < 0)
         return -1;
     return 0;
 }
@@ -1629,7 +1628,7 @@ virNetDevSysfsDeviceFile(char **pf_sysfs_device_link, const char *ifname,
                      const char *file)
 {
 
-    if (virAsprintf(pf_sysfs_device_link, NET_SYSFS "%s/device/%s", ifname,
+    if (virAsprintf(pf_sysfs_device_link, SYSFS_NET_DIR "%s/device/%s", ifname,
                     file) < 0)
         return -1;
     return 0;
diff --git a/src/util/virnetdev.h b/src/util/virnetdev.h
index 3535319..3e44d9f 100644
--- a/src/util/virnetdev.h
+++ b/src/util/virnetdev.h
@@ -219,6 +219,8 @@ int virNetDevSetRcvAllMulti(const char *ifname, bool receive)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
 int virNetDevGetRcvAllMulti(const char *ifname, bool *receive)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
+
+# define SYSFS_NET_DIR "/sys/class/net"
 int virNetDevSysfsFile(char **pf_sysfs_device_link,
                        const char *ifname,
                        const char *file)
diff --git a/src/util/virnetdevbridge.c b/src/util/virnetdevbridge.c
index 6be8aa3..e601bdc 100644
--- a/src/util/virnetdevbridge.c
+++ b/src/util/virnetdevbridge.c
@@ -114,7 +114,6 @@ static int virNetDevBridgeCmd(const char *brname,
 #endif
 
 #if defined(HAVE_STRUCT_IFREQ) && defined(__linux__)
-# define SYSFS_NET_DIR "/sys/class/net"
 /*
  * Bridge parameters can be set via sysfs on newish kernels,
  * or by  ioctl on older kernels. Perhaps we could just use
diff --git a/src/util/virnetdevmacvlan.c b/src/util/virnetdevmacvlan.c
index 5fd2097..0eabee5 100644
--- a/src/util/virnetdevmacvlan.c
+++ b/src/util/virnetdevmacvlan.c
@@ -236,19 +236,15 @@ static
 int virNetDevMacVLanTapOpen(const char *ifname,
                             int retries)
 {
-    FILE *file;
-    char path[64];
+    int ret = -1;
+    FILE *file = NULL;
+    char *path;
     int ifindex;
     char tapname[50];
     int tapfd;
 
-    if (snprintf(path, sizeof(path),
-                 "/sys/class/net/%s/ifindex", ifname) >= sizeof(path)) {
-        virReportSystemError(errno,
-                             "%s",
-                             _("buffer for ifindex path is too small"));
+    if (virNetDevSysfsFile(&path, ifname, "ifindex") < 0)
         return -1;
-    }
 
     file = fopen(path, "r");
 
@@ -256,15 +252,14 @@ int virNetDevMacVLanTapOpen(const char *ifname,
         virReportSystemError(errno,
                              _("cannot open macvtap file %s to determine "
                                "interface index"), path);
-        return -1;
+        goto cleanup;
     }
 
     if (fscanf(file, "%d", &ifindex) != 1) {
         virReportSystemError(errno,
                              "%s", _("cannot determine macvtap's tap device "
                              "interface index"));
-        VIR_FORCE_FCLOSE(file);
-        return -1;
+        goto cleanup;
     }
 
     VIR_FORCE_FCLOSE(file);
@@ -288,12 +283,17 @@ int virNetDevMacVLanTapOpen(const char *ifname,
         break;
     }
 
-    if (tapfd < 0)
+    if (tapfd < 0) {
         virReportSystemError(errno,
                              _("cannot open macvtap tap device %s"),
                              tapname);
-
-    return tapfd;
+        goto cleanup;
+    }
+    ret = tapfd;
+ cleanup:
+    VIR_FREE(path);
+    VIR_FORCE_FCLOSE(file);
+    return ret;
 }
 
 
-- 
2.0.5


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