added a small tool to explore libxml2 and libxslt

1 files changed, 106 insertions, 0 deletions

diff --git a/sudoers/worker.c b/sudoers/worker.c
new file mode 100644
index 0000000..3d5d637
--- /dev/null
+++ b/sudoers/worker.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <libxml/tree.h>
+#include <libxml/parser.h>
+#include <libxml/xpath.h>
+#include <libxml/xpathInternals.h>
+
+
+int main(int argc, char **argv) {
+
+  int i;
+  xmlChar *str;
+  xmlDocPtr doc;
+  xmlXPathContextPtr xpathCtx;
+  xmlXPathObjectPtr xpathObj;
+/* If a default namespace is defined
+ *  
+ * IMPORTANT: XPath 1.0 has no concept of a default namespace. Unprefixed names in XPath only match names which have no namespace.
+ * So, if the document uses a default namespace, it is required to associate a non-empty prefix with the default namespace
+ * via register-namespace  and add that prefix to names in XPath expressions intended to match nodes in the default namespace.
+ */
+  xmlChar *xpathExpr_rng = (xmlChar *) "//su:RNGfile";
+  xmlChar *xpathExpr_xslt = (xmlChar *) "//su:XSLTfile";
+  xmlNodeSetPtr nodeset;
+
+  if (argc!=2) {
+    fprintf(stderr, "missing or to many arguments, I expect a single filename!\n");
+    exit(1);
+  }
+
+  doc = xmlParseFile(argv[1]);
+  if (doc==NULL) {
+    fprintf(stderr, "Cannot parse document %s!\n", argv[1]);
+    exit(1);
+  }
+
+  /* Create xpath evaluation context */
+  xpathCtx = xmlXPathNewContext(doc);
+  if(xpathCtx == NULL) {
+      fprintf(stderr,"Error: unable to create new XPath context\n");
+      xmlFreeDoc(doc); 
+      exit(1);
+  }
+
+
+  /* Register a namespace */
+  if(xmlXPathRegisterNs(xpathCtx, "su", "http://freeipa.org/xml/rng/sudo/sudoers/1.0") != 0) {
+    fprintf(stderr,"Error: unable to register NS with prefix=\"%s\" and href=\"%s\"\n", "", "http://freeipa.org/xml/rng/sudo/sudoers/1.0");
+    xmlXPathFreeContext(xpathCtx); 
+    xmlFreeDoc(doc); 
+    exit(1);
+  }
+
+
+  /* Evaluate xpath expression */
+  xpathObj = xmlXPathEvalExpression(xpathExpr_xslt, xpathCtx);
+  if(xpathObj == NULL) {
+      fprintf(stderr,"Error: unable to evaluate xpath expression \"%s\"\n", xpathExpr_xslt);
+      xmlXPathFreeContext(xpathCtx); 
+      xmlFreeDoc(doc); 
+      return(-1);
+  }
+
+  if (xmlXPathNodeSetIsEmpty(xpathObj->nodesetval)) {
+    printf("Nothing found ...\n");
+  } else {
+    nodeset=xpathObj->nodesetval;
+    for(i=0; i<nodeset->nodeNr; i++) {
+      str = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
+      printf("--%s--\n", str);
+      xmlFree(str);
+    }
+  }
+  /* Evaluate xpath expression */
+  xpathObj = xmlXPathEvalExpression(xpathExpr_rng, xpathCtx);
+  if(xpathObj == NULL) {
+      fprintf(stderr,"Error: unable to evaluate xpath expression \"%s\"\n", xpathExpr_rng);
+      xmlXPathFreeContext(xpathCtx); 
+      xmlFreeDoc(doc); 
+      return(-1);
+  }
+
+  if (xmlXPathNodeSetIsEmpty(xpathObj->nodesetval)) {
+    printf("Nothing found ...\n");
+  } else {
+    nodeset=xpathObj->nodesetval;
+    for(i=0; i<nodeset->nodeNr; i++) {
+      str = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
+      printf("--%s--\n", str);
+      xmlFree(str);
+    }
+  }
+
+  /* Cleanup */
+  xmlXPathFreeObject(xpathObj);
+  xmlXPathFreeContext(xpathCtx); 
+  xmlFreeDoc(doc); 
+
+  
+
+
+  return(0);
+}