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From ec2c5ffde7a1ca63219d47831725599e7de76f7f Mon Sep 17 00:00:00 2001
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From: Timo Sirainen <timo.sirainen@open-xchange.com>
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Date: Wed, 18 Nov 2020 20:48:11 +0200
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Subject: [PATCH] lib-imap: Fix writing BODYSTRUCTURE for truncated multipart/
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part
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If the max nesting limit is reached, write the last part out as
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application/octet-stream. The original content-type could be confusing
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IMAP clients when they don't see any child parts.
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---
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src/lib-imap/imap-bodystructure.c | 6 ++++++
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src/lib-imap/test-imap-bodystructure.c | 15 +++++++++++++++
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2 files changed, 21 insertions(+)
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diff --git a/src/lib-imap/imap-bodystructure.c b/src/lib-imap/imap-bodystructure.c
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index ab422c00d2..bfb6e64197 100644
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--- a/src/lib-imap/imap-bodystructure.c
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+++ b/src/lib-imap/imap-bodystructure.c
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@@ -147,6 +147,7 @@ static bool part_is_truncated(const struct message_part *part)
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const struct message_part_data *data = part->data;
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i_assert((part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) == 0);
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+ i_assert((part->flags & MESSAGE_PART_FLAG_MULTIPART) == 0);
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if (data->content_type != NULL) {
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if (strcasecmp(data->content_type, "message") == 0 &&
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@@ -155,6 +156,11 @@ static bool part_is_truncated(const struct message_part *part)
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MESSAGE_PART_FLAG_MESSAGE_RFC822. */
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return TRUE;
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}
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+ if (strcasecmp(data->content_type, "multipart") == 0) {
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+ /* It's multipart/, but without
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+ MESSAGE_PART_FLAG_MULTIPART. */
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+ return TRUE;
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+ }
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}
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return FALSE;
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}
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diff --git a/src/lib-imap/test-imap-bodystructure.c b/src/lib-imap/test-imap-bodystructure.c
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index 6cb699e126..2118907e78 100644
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--- a/src/lib-imap/test-imap-bodystructure.c
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+++ b/src/lib-imap/test-imap-bodystructure.c
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@@ -556,6 +556,21 @@ static const struct {
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.bodystructure = "\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 159 (NIL NIL NIL NIL NIL NIL NIL NIL NIL NIL) (\"application\" \"octet-stream\" NIL NIL NIL \"7bit\" 110 NIL NIL NIL NIL) 11 NIL NIL NIL NIL",
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.max_depth = 2,
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},
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+ {
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+ .input = "Content-Type: multipart/mixed; boundary=1\n"
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+ "\n"
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+ "--1\n"
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+ "Content-Type: multipart/mixed; boundary=2\n"
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+ "\n"
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+ "--2\n"
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+ "Content-Type: multipart/mixed; boundary=3\n"
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+ "\n"
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+ "--3\n"
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+ "\n"
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+ "body\n",
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+ .bodystructure = "(\"application\" \"octet-stream\" (\"boundary\" \"2\") NIL NIL \"7bit\" 63 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"1\") NIL NIL NIL",
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+ .max_depth = 2,
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+ },
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};
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static void test_imap_bodystructure_truncation(void)
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