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https://github.com/ibm-s390-linux/s390-tools.git
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c85b4e54dd
Improve handling of TERM environment processing by validating the received terminal name. If the terminal name is not valid, a message will be displayed and the default terminal will be used. Reviewed-by: Steffen Eiden <seiden@linux.ibm.com> Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
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* iucvtty / iucvconn - IUCV Terminal Applications
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*
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* Structure and function definitions for the IUCV terminal message protocol
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*
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* Copyright IBM Corp. 2008, 2017
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#ifndef __IUCVTTY_PROTO_H_
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#define __IUCVTTY_PROTO_H_
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lib/util_base.h"
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/* Standard macros */
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#ifndef offsetof
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# define offsetof(type, member) ((size_t) &((type *)0)->member)
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#endif
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/* Packet version magic */
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#define MSG_VERSION 0x02
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/* Message types */
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#define MSG_TYPE_ERROR 0x01 /* Error message. */
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#define MSG_TYPE_TERMENV 0x02 /* Terminal environment variable. */
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#define MSG_TYPE_TERMIOS 0x04 /* Terminal IO struct update. */
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#define MSG_TYPE_WINSIZE 0x08 /* Terminal window size update. */
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#define MSG_TYPE_DATA 0x10 /* Terminal data. */
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struct iucvtty_msg {
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uint8_t version; /* Message version */
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uint8_t type; /* Message type */
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uint16_t datalen; /* Number of bytes in payload */
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uint8_t data[]; /* Payload buffer */
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} __attribute__((packed));
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#define MSG_DATA_OFFSET (offsetof(struct iucvtty_msg, data))
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#define msg_size(m) (MSG_DATA_OFFSET + (m)->datalen)
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/**
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* msg_cpy_from() - Copy data to message
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* @msg: IUCV terminal message
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* @src: Pointer to source data buffer
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* @len: Length of source data buffer
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*
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* Copies @len bytes from @src to the message data buffer. The caller must
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* ensure not to overwrite the message data buffer.
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* Finally, the message datalen is set to @len
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*/
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static inline void msg_cpy_from(struct iucvtty_msg *msg, const void *src,
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size_t len)
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{
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memcpy(msg->data, src, len);
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msg->datalen = len;
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}
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/**
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* msg_cpy_to() - Copy data from a message
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* @msg: IUCV terminal message
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* @dst: Destination buffer
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* @len: Destination buffer length.
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*
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* Copies up to min(@len, message datalen) number of bytes from the IUCV
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* terminal message to the destination buffer.
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*/
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static inline void msg_cpy_to(const struct iucvtty_msg *msg, void *dst,
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size_t len)
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{
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memcpy(dst, msg->data, MIN(msg->datalen, len));
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}
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/**
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* msg_alloc() - Allocates a new iucv terminal message.
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* @type: Message type
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* @size: Message data size
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*
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* The function allocates a new iucv terminal message with the given data size
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* @size. (The total message size is @size plus MSG_DATA_OFFSET.)
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* The new message is initialized with the specific @type.
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*/
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static inline struct iucvtty_msg *msg_alloc(uint8_t type, uint16_t size)
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{
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struct iucvtty_msg *m;
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m = calloc(1, size + MSG_DATA_OFFSET);
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if (m != NULL) {
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m->version = MSG_VERSION;
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m->type = type;
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m->datalen = size;
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}
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return m;
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}
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/**
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* msg_free() - free an allocated iucv tty message
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*/
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static inline void msg_free(struct iucvtty_msg *m)
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{
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free(m);
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}
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#endif /* __IUCVTTY_PROTO_H_ */
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