Fix LatexTheme to escape "#" (#4138)

Author: gpotter2

scapy/packet.py

@@ -1442,7 +1442,11 @@ def _show_or_dump(self,
             fvalue = self.getfieldval(f.name)
             if isinstance(fvalue, Packet) or (f.islist and f.holds_packets and isinstance(fvalue, list)):  # noqa: E501
                 pad = max(0, 10 - len(f.name)) * " "
-                s += "%s  \\%s%s\\\n" % (label_lvl + lvl, ncol(f.name), pad)
+                s += "%s  %s%s%s%s\n" % (label_lvl + lvl,
+                                         ct.punct("\\"),
+                                         ncol(f.name),
+                                         pad,
+                                         ct.punct("\\"))
                 fvalue_gen = SetGen(
                     fvalue,
                     _iterpacket=0

scapy/themes.py

@@ -271,6 +271,10 @@ def __getattr__(self, attr):
 
 
 class LatexTheme(FormatTheme):
+    r"""
+    You can prepend the output from this theme with
+    \tt\obeyspaces\obeylines\tiny\noindent
+    """
     style_prompt = r"\textcolor{blue}{%s}"
     style_not_printable = r"\textcolor{gray}{%s}"
     style_layer_name = r"\textcolor{red}{\bf %s}"
@@ -289,6 +293,11 @@ class LatexTheme(FormatTheme):
 #    style_odd = ""
     style_logo = r"\textcolor{green}{\bf %s}"
 
+    def __getattr__(self, attr: str) -> Callable[[Any], str]:
+        from scapy.utils import tex_escape
+        styler = super(LatexTheme, self).__getattr__(attr)
+        return lambda x: styler(tex_escape(x))
+
 
 class LatexTheme2(FormatTheme):
     style_prompt = r"@`@textcolor@[@blue@]@@[@%s@]@"

test/regression.uts

@@ -110,6 +110,23 @@ def test_list_contrib():
 
 test_list_contrib()
 
+= Test packet show() on LatexTheme
+% with LatexTheme
+
+class SmallPacket(Packet):
+    fields_desc = [ByteField("a", 0)]
+
+conf_color_theme = conf.color_theme
+conf.color_theme = LatexTheme()
+pkt = SmallPacket()
+with ContextManagerCaptureOutput() as cmco:
+    pkt.show()
+    result = cmco.get_output().strip()
+
+assert result == '\\#\\#\\#[ \\textcolor{red}{\\bf SmallPacket} ]\\#\\#\\# \n  \\textcolor{blue}{a}         = \\textcolor{purple}{0}'
+conf.color_theme = conf_color_theme
+
+
 = Test automatic doc generation
 ~ command