commit c14375d: [Minor] Treat empty `from` protocol header as canonical `<>`

[Vsevolod Stakhov]

Author: Vsevolod Stakhov
Date: 2021-11-19 14:46:11 +0000
URL: https://github.com/rspamd/rspamd/commit/c14375d20c3628e074af585c399b4e342ed37e07 (HEAD -> master)

[Minor] Treat empty `from` protocol header as canonical `<>`
Issue: #3983

---
 src/libserver/protocol.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/libserver/protocol.c b/src/libserver/protocol.c
index 654f16113..65d0900df 100644
--- a/src/libserver/protocol.c
+++ b/src/libserver/protocol.c
@@ -499,6 +499,10 @@ rspamd_protocol_handle_headers (struct rspamd_task *task,
 			case 'f':
 			case 'F':
 				IF_HEADER (FROM_HEADER) {
+					if (hv_tok->len == 0) {
+						/* Replace '' with '<>' to fix parsing issue */
+						RSPAMD_FTOK_ASSIGN(hv_tok, "<>");
+					}
 					task->from_envelope = rspamd_email_address_from_smtp (
 							hv_tok->begin,
 							hv_tok->len);