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iucvterm: Improve received message type and length checking

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The iucvtty_read_msg() now receives the entire message header.
Perform message header checks for specific message types where the
payload length is clearly defined.  Also this needs to be done prior
starting the message chunk processing because the message datalen
field will be adjusted based on the read chunks.

Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Hendrik Brueckner
2026-07-06 13:27:31 +02:00
committed by Jan Höppner
parent 56a55901c1
commit 29db9032b3
3 changed files with 57 additions and 5 deletions
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iucvterm/include/iucvterm/functions.h
+3
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@@ -21,6 +21,9 @@
/* Message buffer: message header + 4096 bytes of data */
#define MSG_BUFFER_SIZE (MSG_DATA_OFFSET + (4096))
/* Message data sizes */
#define MAX_TERM_SIZE 256
/* Error macros */
#define print_error(s) program_error(PRG_COMPONENT, (s))
#define iucvtty_error(m) \