Do not bomb out on unusual xml

In particular, properly handle directy Type child of XRD element.

As usually, thanks to Joseph Smarr of Plaxo for spotting it ;-)

Signed-off-by: Michael Krelin <hacker@klever.net>

1 files changed, 26 insertions, 15 deletions

diff --git a/lib/discovery.cc b/lib/discovery.cc
index cbdceb3..f8a3988 100644
--- a/lib/discovery.cc
+++ b/lib/discovery.cc
@@ -449,35 +449,46 @@ namespace opkele {
                 }
             }
             void end_element(const XML_Char *n) {
                 if(skipping<0) return;
                 if(skipping) {
                     --skipping; return;
                 }
                 if(is_qelement(n,NSURI_XRD "\tType")) {
-                    assert(xrd); assert(xrd_service); assert(cdata==&cdata_buf);
-                    xrd_service->types.insert(cdata_buf);
+                    if(xrd && xrd_service) {
+                        assert(cdata==&cdata_buf);
+                        xrd_service->types.insert(cdata_buf);
+                    }
                 }else if(is_qelement(n,NSURI_XRD "\tService")) {
-                    assert(xrd); assert(xrd_service);
-                    assert(!pt_stack.empty());
-                    assert(pt_stack.back()==(NSURI_XRD "\tService"));
-                    pt_stack.pop_back();
-                    xrd_service = 0;
-                }else if(is_qelement(n,NSURI_XRD "\tStatus")) {
-                    assert(xrd);
-                    if(is_qelement(pt_stack.back().c_str(),n)) {
-                        assert(cdata==&status_string);
+                    if(!(xrd && xrd_service)) {
+                        skipping = -1;
+                    }else{
+                        assert(!pt_stack.empty());
+                        assert(pt_stack.back()==(NSURI_XRD "\tService"));
                         pt_stack.pop_back();
-                        if(status_code!=100)
-                            skipping = -1;
+                        xrd_service = 0;
+                    }
+                }else if(is_qelement(n,NSURI_XRD "\tStatus")) {
+                    if(!xrd) {
+                        skipping=-1;
+                    }else{
+                        if(is_qelement(pt_stack.back().c_str(),n)) {
+                            assert(cdata==&status_string);
+                            pt_stack.pop_back();
+                            if(status_code!=100)
+                                skipping = -1;
+                        }
                     }
                 }else if(is_qelement(n,NSURI_XRD "\tExpires")) {
-                    assert(xrd);
-                    xrd->expires = util::w3c_to_time(cdata_buf);
+                    if(!xrd) {
+                        skipping=-1;
+                    }else{
+                        xrd->expires = util::w3c_to_time(cdata_buf);
+                    }
                 }else if((xmode&xmode_html) && is_element(n,"head")) {
                     skipping = -1;
                 }
                 cdata = 0;
             }
             void character_data(const XML_Char *s,int l) {
                 if(skipping) return;
                 if(cdata) cdata->append(s,l);