From f2f7785d7a47ffa48ac929648794e1288509ddd8 Mon Sep 17 00:00:00 2001
From: Sebastian Scheibner <asamk@gmx.de>
Date: Sun, 17 May 2020 14:52:10 +0200
Subject: busctl: Add introspect support for methods with same name but
 different signature

D-Bus interfaces can have multiple methods with the same name, as long
as they have different arguments (signature). Currently busctl can call
those methods but when introspecting the interface it just displays
"Duplicate method"

This PR fixes the behavior, by also adding the signature to the hash for
the members set.

Before this patch:

$ busctl introspect org.asamk.Signal /org/asamk/Signal
Invalid introspection data: duplicate method 'sendMessage' on interface 'org.asamk.Signal'.

After this patch:

$ busctl introspect org.asamk.Signal /org/asamk/Signal
NAME                                TYPE      SIGNATURE RESULT/VALUE FLAGS
org.asamk.Signal                    interface -         -            -
.sendMessage                        method    as        x            -
.sendMessage                        method    s         x            -

Calling the methods already works as expected, as the user must specify
the signature explicitely:
busctl --user call org.asamk.Signal /org/asamk/Signal org.asamk.Signal sendMessage "as" 2 foo bar
busctl --user call org.asamk.Signal /org/asamk/Signal org.asamk.Signal sendMessage "s" foo

$ busctl --xml introspect org.asamk.Signal /org/asamk/Signal
<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node name="/org/asamk/Signal">
 <interface name="org.asamk.Signal">
  <method name="sendMessage" >
   <arg type="as" direction="in"/>
   <arg type="x" direction="out"/>
  </method>
  <method name="sendMessage" >
   <arg type="s" direction="in"/>
   <arg type="x" direction="out"/>
  </method>
 <interface name="org.freedesktop.DBus.Introspectable">
  <method name="Introspect">
   <arg type="s" direction="out"/>
  </method>
 </interface>
 <interface name="org.freedesktop.DBus.Peer">
  <method name="Ping">
  </method>
 </interface>
</node>
---
 src/busctl/busctl.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/busctl/busctl.c b/src/busctl/busctl.c
index c637d084e7..a6dbf0ddb5 100644
--- a/src/busctl/busctl.c
+++ b/src/busctl/busctl.c
@@ -742,6 +742,9 @@ static void member_hash_func(const Member *m, struct siphash *state) {
         if (m->name)
                 string_hash_func(m->name, state);
 
+        if (m->signature)
+                string_hash_func(m->signature, state);
+
         if (m->interface)
                 string_hash_func(m->interface, state);
 }
@@ -762,7 +765,11 @@ static int member_compare_func(const Member *x, const Member *y) {
         if (d != 0)
                 return d;
 
-        return strcmp_ptr(x->name, y->name);
+        d = strcmp_ptr(x->name, y->name);
+        if (d != 0)
+                return d;
+
+        return strcmp_ptr(x->signature, y->signature);
 }
 
 static int member_compare_funcp(Member * const *a, Member * const *b) {
-- 
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