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diff -up openchange-openchange-2.3-VULCAN/libmapiadmin/libmapiadmin.h.samba-4.12 openchange-openchange-2.3-VULCAN/libmapiadmin/libmapiadmin.h
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--- openchange-openchange-2.3-VULCAN/libmapiadmin/libmapiadmin.h.samba-4.12	2020-01-27 11:33:02.941846935 +0100
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+++ openchange-openchange-2.3-VULCAN/libmapiadmin/libmapiadmin.h	2020-01-27 11:33:19.170846710 +0100
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@@ -103,7 +103,9 @@ __BEGIN_DECLS
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 struct ldb_dn *samdb_search_dn(struct ldb_context *, TALLOC_CTX *, struct ldb_dn *, const char *, ...) _PRINTF_ATTRIBUTE(4,5);
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 struct dom_sid *dom_sid_add_rid(TALLOC_CTX *, const struct dom_sid *, uint32_t);
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 bool encode_pw_buffer(uint8_t buffer[516], const char *, int);
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+#if 0 /* removed in samba 4.12 */
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 void arcfour_crypt_blob(uint8_t *, int, const DATA_BLOB *);
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+#endif
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 /* The following public definitions come from libmapiadmin/mapiadmin.c */
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 struct mapiadmin_ctx *mapiadmin_init(struct mapi_session *);
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diff -up openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c.samba-4.12 openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c
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--- openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c.samba-4.12	2020-01-27 11:25:31.398853179 +0100
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+++ openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c	2020-01-27 11:31:27.490848255 +0100
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@@ -592,6 +592,9 @@ _PUBLIC_ enum MAPISTATUS mapiadmin_user_
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  */
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 _PUBLIC_ enum MAPISTATUS mapiadmin_user_add(struct mapiadmin_ctx *mapiadmin_ctx)
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 {
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+	OC_DEBUG(3, "mapiadmin_user_add(): is disabled");
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+	return MAPI_E_UNABLE_TO_COMPLETE;
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+#if 0 /* disable it, use samba function directly, if needed (no 'arcfour_crypt_blob' in samba 4.12) */
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 	TALLOC_CTX			*mem_ctx;
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 	NTSTATUS			status;
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 	enum MAPISTATUS			retval;
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@@ -732,6 +735,7 @@ again:
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 	talloc_free(mem_ctx);
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 	return MAPI_E_SUCCESS;
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+#endif
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 }
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 /**
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diff -up openchange-openchange-2.3-VULCAN/ndr_mapi.c.samba-4.12 openchange-openchange-2.3-VULCAN/ndr_mapi.c
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--- openchange-openchange-2.3-VULCAN/ndr_mapi.c.samba-4.12	2020-01-27 11:04:07.136870938 +0100
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+++ openchange-openchange-2.3-VULCAN/ndr_mapi.c	2020-01-27 11:12:29.978863985 +0100
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@@ -2151,7 +2151,11 @@ enum ndr_err_code ndr_push_RestrictionVa
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 		uint32_t _flags_save_STRUCT = ndr->flags;
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 		ndr_set_flags(&ndr->flags, LIBNDR_FLAG_NOALIGN);
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 		if (ndr_flags & NDR_SCALARS) {
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-			int level = ndr_push_get_switch_value(ndr, r);
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+			uint32_t level = 0;
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+
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+			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_steal_switch_value(ndr, r, &level)))
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+				level = 0;
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+
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 			switch (level) {
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 				case 0x0: {
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 					break; }
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@@ -2165,7 +2169,9 @@ enum ndr_err_code ndr_push_RestrictionVa
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 			}
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 		}
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 		if (ndr_flags & NDR_BUFFERS) {
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-			int level = ndr_push_get_switch_value(ndr, r);
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+			uint32_t level;
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+			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_steal_switch_value(ndr, r, &level)))
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+				level = 0;
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 			switch (level) {
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 				case 0x0:
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 				break;
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@@ -2187,9 +2193,10 @@ enum ndr_err_code ndr_push_RestrictionVa
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 enum ndr_err_code  ndr_pull_RestrictionVariable(struct ndr_pull *ndr, int ndr_flags, union RestrictionVariable *r)
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 {
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-	int level;
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+	uint32_t level;
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 	TALLOC_CTX *_mem_save_res_0;
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-	level = ndr_pull_get_switch_value(ndr, r);
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+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_pull_steal_switch_value(ndr, r, &level)))
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+		level = 0;
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 	{
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 		uint32_t _flags_save_STRUCT = ndr->flags;
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 		ndr_set_flags(&ndr->flags, LIBNDR_FLAG_NOALIGN);
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@@ -2237,8 +2244,8 @@ enum ndr_err_code  ndr_pull_RestrictionV
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 _PUBLIC_ void ndr_print_RestrictionVariable(struct ndr_print *ndr, const char *name, const union RestrictionVariable *r)
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 {
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-	int level;
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-	level = ndr_print_get_switch_value(ndr, r);
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+	uint32_t level;
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+	level = ndr_print_steal_switch_value(ndr, r);
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 	ndr_print_union(ndr, name, level, "RestrictionVariable");
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 	switch (level) {
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 		case 0x0: