Send RPL_SASLMECHS to clients (#4253, patch from grawity)

include/numeric.h

@@ -389,5 +389,6 @@
 #define ERR_SASLTOOLONG         905
 #define ERR_SASLABORTED         906
 #define ERR_SASLALREADY         907
+#define RPL_SASLMECHS           908
 
 #define ERR_NUMERICERR       999

src/modules/m_sasl.c

@@ -198,6 +198,8 @@ CMD_FUNC(m_sasl)
 
 			*target_p->local->sasl_agent = '\0';
 		}
+		else if (*parv[3] == 'M')
+			sendto_one(target_p, err_str(RPL_SASLMECHS), me.name, BadPtr(target_p->name) ? "*" : target_p->name, parv[4]);
 
 		return 0;
 	}

src/s_err.c

@@ -960,7 +960,7 @@ static char *replies[] = {
 /* 905 ERR_SASLTOOLONG */       ":%s 905 %s :SASL message too long",
 /* 906 ERR_SASLABORTED */       ":%s 906 %s :SASL authentication aborted",
 /* 907 ERR_SASLALREADY */       ":%s 907 %s :You have already completed SASL authentication",
-/* 908 */ NULL,
+/* 908 RPL_SASLMECHS */         ":%s 908 %s %s :are available SASL mechanisms",
 /* 909 */ NULL,
 /* 910 */ NULL,
 /* 911 */ NULL,