1 files changed, 219 insertions, 0 deletions

diff --git a/other/openssh-2.1.1p4/packet.h b/other/openssh-2.1.1p4/packet.h
new file mode 100644
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+++ b/other/openssh-2.1.1p4/packet.h
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+/*
+ *
+ * packet.h
+ *
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ *
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * Created: Sat Mar 18 02:02:14 1995 ylo
+ *
+ * Interface for the packet protocol functions.
+ *
+ */
+
+/* RCSID("$OpenBSD: packet.h,v 1.16 2000/06/20 01:39:43 markus Exp $"); */
+
+#ifndef PACKET_H
+#define PACKET_H
+
+#include <openssl/bn.h>
+
+/*
+ * Sets the socket used for communication.  Disables encryption until
+ * packet_set_encryption_key is called.  It is permissible that fd_in and
+ * fd_out are the same descriptor; in that case it is assumed to be a socket.
+ */
+void    packet_set_connection(int fd_in, int fd_out);
+
+/* Puts the connection file descriptors into non-blocking mode. */
+void    packet_set_nonblocking(void);
+
+/* Returns the file descriptor used for input. */
+int     packet_get_connection_in(void);
+
+/* Returns the file descriptor used for output. */
+int     packet_get_connection_out(void);
+
+/*
+ * Closes the connection (both descriptors) and clears and frees internal
+ * data structures.
+ */
+void    packet_close(void);
+
+/*
+ * Causes any further packets to be encrypted using the given key.  The same
+ * key is used for both sending and reception.  However, both directions are
+ * encrypted independently of each other.  Cipher types are defined in ssh.h.
+ */
+void
+packet_set_encryption_key(const unsigned char *key, unsigned int keylen,
+    int cipher_type);
+
+/*
+ * Sets remote side protocol flags for the current connection.  This can be
+ * called at any time.
+ */
+void    packet_set_protocol_flags(unsigned int flags);
+
+/* Returns the remote protocol flags set earlier by the above function. */
+unsigned int packet_get_protocol_flags(void);
+
+/* Enables compression in both directions starting from the next packet. */
+void    packet_start_compression(int level);
+
+/*
+ * Informs that the current session is interactive.  Sets IP flags for
+ * optimal performance in interactive use.
+ */
+void    packet_set_interactive(int interactive, int keepalives);
+
+/* Returns true if the current connection is interactive. */
+int     packet_is_interactive(void);
+
+/* Starts constructing a packet to send. */
+void    packet_start(int type);
+
+/* Appends a character to the packet data. */
+void    packet_put_char(int ch);
+
+/* Appends an integer to the packet data. */
+void    packet_put_int(unsigned int value);
+
+/* Appends an arbitrary precision integer to packet data. */
+void    packet_put_bignum(BIGNUM * value);
+void    packet_put_bignum2(BIGNUM * value);
+
+/* Appends a string to packet data. */
+void    packet_put_string(const char *buf, unsigned int len);
+void    packet_put_cstring(const char *str);
+void    packet_put_raw(const char *buf, unsigned int len);
+
+/*
+ * Finalizes and sends the packet.  If the encryption key has been set,
+ * encrypts the packet before sending.
+ */
+void    packet_send(void);
+
+/* Waits until a packet has been received, and returns its type. */
+int     packet_read(int *payload_len_ptr);
+
+/*
+ * Waits until a packet has been received, verifies that its type matches
+ * that given, and gives a fatal error and exits if there is a mismatch.
+ */
+void    packet_read_expect(int *payload_len_ptr, int type);
+
+/*
+ * Checks if a full packet is available in the data received so far via
+ * packet_process_incoming.  If so, reads the packet; otherwise returns
+ * SSH_MSG_NONE.  This does not wait for data from the connection.
+ * SSH_MSG_DISCONNECT is handled specially here.  Also, SSH_MSG_IGNORE
+ * messages are skipped by this function and are never returned to higher
+ * levels.
+ */
+int     packet_read_poll(int *packet_len_ptr);
+
+/*
+ * Buffers the given amount of input characters.  This is intended to be used
+ * together with packet_read_poll.
+ */
+void    packet_process_incoming(const char *buf, unsigned int len);
+
+/* Returns a character (0-255) from the packet data. */
+unsigned int packet_get_char(void);
+
+/* Returns an integer from the packet data. */
+unsigned int packet_get_int(void);
+
+/*
+ * Returns an arbitrary precision integer from the packet data.  The integer
+ * must have been initialized before this call.
+ */
+void    packet_get_bignum(BIGNUM * value, int *length_ptr);
+void    packet_get_bignum2(BIGNUM * value, int *length_ptr);
+char    *packet_get_raw(int *length_ptr);
+
+/*
+ * Returns a string from the packet data.  The string is allocated using
+ * xmalloc; it is the responsibility of the calling program to free it when
+ * no longer needed.  The length_ptr argument may be NULL, or point to an
+ * integer into which the length of the string is stored.
+ */
+char   *packet_get_string(unsigned int *length_ptr);
+
+/*
+ * Logs the error in syslog using LOG_INFO, constructs and sends a disconnect
+ * packet, closes the connection, and exits.  This function never returns.
+ * The error message should not contain a newline.  The total length of the
+ * message must not exceed 1024 bytes.
+ */
+void    packet_disconnect(const char *fmt,...) __attribute__((format(printf, 1, 2)));
+
+/*
+ * Sends a diagnostic message to the other side.  This message can be sent at
+ * any time (but not while constructing another message). The message is
+ * printed immediately, but only if the client is being executed in verbose
+ * mode.  These messages are primarily intended to ease debugging
+ * authentication problems.  The total length of the message must not exceed
+ * 1024 bytes.  This will automatically call packet_write_wait.  If the
+ * remote side protocol flags do not indicate that it supports SSH_MSG_DEBUG,
+ * this will do nothing.
+ */
+void    packet_send_debug(const char *fmt,...) __attribute__((format(printf, 1, 2)));
+
+/* Checks if there is any buffered output, and tries to write some of the output. */
+void    packet_write_poll(void);
+
+/* Waits until all pending output data has been written. */
+void    packet_write_wait(void);
+
+/* Returns true if there is buffered data to write to the connection. */
+int     packet_have_data_to_write(void);
+
+/* Returns true if there is not too much data to write to the connection. */
+int     packet_not_very_much_data_to_write(void);
+
+/* maximum packet size, requested by client with SSH_CMSG_MAX_PACKET_SIZE */
+extern int max_packet_size;
+int     packet_set_maxsize(int s);
+#define packet_get_maxsize() max_packet_size
+
+/* Stores tty modes from the fd into current packet. */
+void    tty_make_modes(int fd);
+
+/* Parses tty modes for the fd from the current packet. */
+void    tty_parse_modes(int fd, int *n_bytes_ptr);
+
+#define packet_integrity_check(payload_len, expected_len, type) \
+do { \
+  int _p = (payload_len), _e = (expected_len); \
+  if (_p != _e) { \
+    log("Packet integrity error (%d != %d) at %s:%d", \
+        _p, _e, __FILE__, __LINE__); \
+    packet_disconnect("Packet integrity error. (%d)", (type)); \
+  } \
+} while (0)
+
+#define packet_done() \
+do { \
+        int _len = packet_remaining(); \
+        if (_len > 0) { \
+                log("Packet integrity error (%d bytes remaining) at %s:%d", \
+                    _len ,__FILE__, __LINE__); \
+                packet_disconnect("Packet integrity error."); \
+        } \
+} while (0)
+
+/* remote host is connected via a socket/ipv4 */
+int     packet_connection_is_on_socket(void);
+int     packet_connection_is_ipv4(void);
+
+/* enable SSH2 packet format */
+void    packet_set_ssh2_format(void);
+
+/* returns remaining payload bytes */
+int     packet_remaining(void);
+
+#endif                          /* PACKET_H */