[libvirt] [PATCH 2/4 v2] conf: Parse and format disk <wwn>

[Osier Yang]

Validates the wwn while parsing, error out if it's malformed.

* src/util/util.h: Declare virValidateWWN
* src/util/util.c: Implement virValidateWWN
* src/libvirt_private.syms: Export virValidateWWN.
* src/conf/domain_conf.h: New member 'wwn' for disk def.
* src/conf/domain_conf.c: Parse and format disk <wwn>
---
 src/conf/domain_conf.c   |   12 +++++++++++-
 src/conf/domain_conf.h   |    1 +
 src/libvirt_private.syms |    1 +
 src/util/util.c          |   24 ++++++++++++++++++++++++
 src/util/util.h          |    2 ++
 5 files changed, 39 insertions(+), 1 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 554298d..df6599a 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -950,6 +950,7 @@ void virDomainDiskDefFree(virDomainDiskDefPtr def)
     VIR_FREE(def->mirror);
     VIR_FREE(def->mirrorFormat);
     VIR_FREE(def->auth.username);
+    VIR_FREE(def->wwn);
     if (def->auth.secretType == VIR_DOMAIN_DISK_SECRET_TYPE_USAGE)
         VIR_FREE(def->auth.secret.usage);
     virStorageEncryptionFree(def->encryption);
@@ -3353,7 +3354,6 @@ cleanup:
     goto cleanup;
 }
 
-
 /* Parse the XML definition for a disk
  * @param node XML nodeset to parse for disk definition
  */
@@ -3402,6 +3402,7 @@ virDomainDiskDefParseXML(virCapsPtr caps,
     char *authUUID = NULL;
     char *usageType = NULL;
     char *tray = NULL;
+    char *wwn = NULL;
 
     if (VIR_ALLOC(def) < 0) {
         virReportOOMError();
@@ -3704,6 +3705,12 @@ virDomainDiskDefParseXML(virCapsPtr caps,
             } else if (!serial &&
                        xmlStrEqual(cur->name, BAD_CAST "serial")) {
                 serial = (char *)xmlNodeGetContent(cur);
+            } else if (!wwn &&
+                       xmlStrEqual(cur->name, BAD_CAST "wwn")) {
+                wwn = (char *)xmlNodeGetContent(cur);
+
+                if (!virValidateWWN(wwn))
+                    goto error;
             } else if (xmlStrEqual(cur->name, BAD_CAST "boot")) {
                 /* boot is parsed as part of virDomainDeviceInfoParseXML */
             }
@@ -4000,6 +4007,8 @@ virDomainDiskDefParseXML(virCapsPtr caps,
     encryption = NULL;
     def->serial = serial;
     serial = NULL;
+    def->wwn = wwn;
+    wwn = NULL;
 
     if (!def->driverType &&
         caps->defaultDiskDriverType &&
@@ -11561,6 +11570,7 @@ virDomainDiskDefFormat(virBufferPtr buf,
     if (def->transient)
         virBufferAddLit(buf, "      <transient/>\n");
     virBufferEscapeString(buf, "      <serial>%s</serial>\n", def->serial);
+    virBufferEscapeString(buf, "      <wwn>%s</wwn>\n", def->wwn);
     if (def->encryption) {
         virBufferAdjustIndent(buf, 6);
         if (virStorageEncryptionFormat(buf, def->encryption) < 0)
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index dfdae49..3b335a0 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -571,6 +571,7 @@ struct _virDomainDiskDef {
     virDomainBlockIoTuneInfo blkdeviotune;
 
     char *serial;
+    char *wwn;
     int cachemode;
     int error_policy;  /* enum virDomainDiskErrorPolicy */
     int rerror_policy; /* enum virDomainDiskErrorPolicy */
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 27eb43e..a0675f4 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1240,6 +1240,7 @@ virStrToLong_ull;
 virStrcpy;
 virStrncpy;
 virTrimSpaces;
+virValidateWWN;
 virVasprintf;
 
 
diff --git a/src/util/util.c b/src/util/util.c
index 91eab72..682a504 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -45,6 +45,7 @@
 #include <termios.h>
 #include <pty.h>
 #include <locale.h>
+#include <regex.h>
 
 #if HAVE_LIBDEVMAPPER_H
 # include <libdevmapper.h>
@@ -3052,3 +3053,26 @@ bool virIsDevMapperDevice(const char *dev_name ATTRIBUTE_UNUSED)
     return false;
 }
 #endif
+
+#define WWN_REG_PATTERN    "[0-9a-zA-Z]{16}"
+bool
+virValidateWWN(const char *wwn) {
+    regex_t re;
+    int err;
+    char error[100];
+
+    if ((err = regcomp(&re, WWN_REG_PATTERN, REG_EXTENDED)) != 0)
+        goto fail;
+
+    if ((err = regexec(&re, wwn, 0, NULL, 0)) != 0)
+        goto fail;
+
+    regfree(&re);
+    return true;
+
+fail:
+    regerror(err, &re, error, sizeof(error));
+    virReportError(VIR_ERR_INTERNAL_ERROR,
+                   _("Malformed wwn: %s"), error);
+    return false;
+}
diff --git a/src/util/util.h b/src/util/util.h
index a5d892d..0c0efad 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -277,4 +277,6 @@ int virBuildPathInternal(char **path, ...) ATTRIBUTE_SENTINEL;
 
 bool virIsDevMapperDevice(const char *dev_name) ATTRIBUTE_NONNULL(1);
 
+bool virValidateWWN(const char *wwn);
+
 #endif /* __VIR_UTIL_H__ */
-- 
1.7.7.3