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Improve doxygen docs

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Signed-off-by: Nikhil V <nikhilgreyshines@gmail.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
This commit is contained in:
nikhil-nari
2025-12-01 17:53:58 +05:30
committed by Jakub Jelen
parent 4bad7cc08f
commit f8d943afda
4 changed files with 432 additions and 6 deletions
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7
include/libssh/callbacks.h
View File

@@ -279,7 +279,6 @@ typedef int (*ssh_auth_pubkey_callback) (ssh_session session, const char *user,
* @returns 0 if the request is to be allowed
* @returns -1 if the request should not be allowed
*/
typedef int (*ssh_service_request_callback) (ssh_session session, const char *service, void *userdata);
/**
@@ -292,7 +291,7 @@ typedef int (*ssh_service_request_callback) (ssh_session session, const char *se
*/
typedef ssh_channel (*ssh_channel_open_request_session_callback) (ssh_session session, void *userdata);
/*
/**
* @brief handle the beginning of a GSSAPI authentication, server side.
* Callback should select the oid and also acquire the server credential.
* @param session current session handler
@@ -307,7 +306,7 @@ typedef ssh_channel (*ssh_channel_open_request_session_callback) (ssh_session se
typedef ssh_string (*ssh_gssapi_select_oid_callback) (ssh_session session, const char *user,
int n_oid, ssh_string *oids, void *userdata);
/*
/**
* @brief handle the negotiation of a security context, server side.
* @param session current session handler
* @param[in] input_token input token provided by client
@@ -322,7 +321,7 @@ typedef ssh_string (*ssh_gssapi_select_oid_callback) (ssh_session session, const
typedef int (*ssh_gssapi_accept_sec_ctx_callback) (ssh_session session,
ssh_string input_token, ssh_string *output_token, void *userdata);
/*
/**
* @brief Verify and authenticates a MIC, server side.
* @param session current session handler
* @param[in] mic input mic to be verified provided by client

27
include/libssh/ed25519.h
View File

@@ -29,12 +29,37 @@
* @{
*/
/** @internal
* @brief Length of an ED25519 public key in bytes.
*/
#define ED25519_PK_LEN 32
/** @internal
* @brief Length of an ED25519 private key in bytes.
*/
#define ED25519_SK_LEN 64
/** @internal
* @brief Length of an ED25519 signature in bytes.
*/
#define ED25519_SIG_LEN 64
/** @internal
* @brief ED25519 public key.
* The public key consists of 32 bytes and can be used for key exchanges.
*/
typedef uint8_t ed25519_pubkey[ED25519_PK_LEN];
/** @internal
* @brief ED25519 private key.
* The private key consists of 64 bytes and should be kept secret.
*/
typedef uint8_t ed25519_privkey[ED25519_SK_LEN];
/** @internal
* @brief ED25519 signature.
* Ed25519 signatures consists of 64 bytes.
*/
typedef uint8_t ed25519_signature[ED25519_SIG_LEN];
#ifdef __cplusplus
@@ -46,7 +71,7 @@ extern "C" {
* @param[out] pk generated public key
* @param[out] sk generated secret key
* @return 0 on success, -1 on error.
* */
*/
int crypto_sign_ed25519_keypair(ed25519_pubkey pk, ed25519_privkey sk);
/** @internal

403
include/libssh/libssh.h
View File

@@ -455,9 +455,44 @@ enum ssh_connector_flags_e {
SSH_CONNECTOR_BOTH = 3
};
/**
* @brief Flushes the output buffer of the session, blocking until the buffer is empty or the timeout is reached
*
* @param[in] session The ssh session.
* @param[in] timeout Timeout (milliseconds)
*
* @return SSH_OK on success (0), SSH_ERROR on error (-1).
*/
LIBSSH_API int ssh_blocking_flush(ssh_session session, int timeout);
/**
* @brief Accept an X11 connection from the server.
*
* @param[in] channel The channel .
* @param[in] timeout_ms Timeout (milliseconds).
*
* @return A new X11 channel, or NULL on error.
*/
LIBSSH_API ssh_channel ssh_channel_accept_x11(ssh_channel channel, int timeout_ms);
/**
* @brief Change the size of the terminal .
*
* @param[in] channel The channel .
* @param[in] cols Number of columns.
* @param[in] rows Number of rows.
*
* @return SSH_OK on success (0), SSH_ERROR on error(-1).
*/
LIBSSH_API int ssh_channel_change_pty_size(ssh_channel channel,int cols,int rows);
/**
* @brief Closes a channel.
*
* @param[in] channel The channel.
*
* @return SSH_OK on success(0), SSH_ERROR on error(-1).
*/
LIBSSH_API int ssh_channel_close(ssh_channel channel);
#define SSH_CHANNEL_FREE(x) \
do { \
@@ -466,23 +501,129 @@ LIBSSH_API int ssh_channel_close(ssh_channel channel);
(x) = NULL; \
} \
} while (0)
/**
* @brief Frees a channel.
*
* @param[in] channel The channel.
*/
LIBSSH_API void ssh_channel_free(ssh_channel channel);
/**
* @brief Get the exit status of a channel .
*
* @param[in] channel The channel .
* @param[out] pexit_code the exit code (can be NULL).
* @param[out] pexit_signal the exit signal string (can be NULL).
* @param[out] pcore_dumped the core dump flag (can be NULL).
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_get_exit_state(ssh_channel channel,
uint32_t *pexit_code,
char **pexit_signal,
int *pcore_dumped);
SSH_DEPRECATED LIBSSH_API int ssh_channel_get_exit_status(ssh_channel channel);
/**
* @brief Used to get the session .
*
* @param[in] channel The channel .
*
* @return The ssh session.
*/
LIBSSH_API ssh_session ssh_channel_get_session(ssh_channel channel);
/**
* @brief Check if the channel is closed.
*
* @param[in] channel The channel .
*
* @return 1 if the channel is closed, 0 otherwise.
*/
LIBSSH_API int ssh_channel_is_closed(ssh_channel channel);
/**
* @brief Check if the remote host has sent an EOF (End Of File).
*
* @param[in] channel The channel .
*
* @return 1 if EOF has been received, 0 otherwise.
*/
LIBSSH_API int ssh_channel_is_eof(ssh_channel channel);
/**
* @brief Check if the channel is open.
*
* @param[in] channel The channel .
*
* @return 1 if the channel is open, 0 otherwise.
*/
LIBSSH_API int ssh_channel_is_open(ssh_channel channel);
/**
* @brief Create a new channel.
*
* @param[in] session The ssh session to use.
*
* @return a new channel, or NULL on error.
*/
LIBSSH_API ssh_channel ssh_channel_new(ssh_session session);
/**
* @brief Open an authentication agent forwarding channel.
*
* @param[in] channel The channel .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_open_auth_agent(ssh_channel channel);
/**
* @brief Open a TCP/IP forwarding channel.
*
* @param[in] channel The channel .
* @param[in] remotehost The remote host that connect to.
* @param[in] remoteport The remote port that connect to.
* @param[in] sourcehost The source host from which to connect.
* @param[in] localport The source port from which to connect.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_open_forward(ssh_channel channel, const char *remotehost,
int remoteport, const char *sourcehost, int localport);
/**
* @brief Open a Unix domain socket forwarding channel.
*
* @param[in] channel The channel .
* @param[in] remotepath The remote path of the socket.
* @param[in] sourcehost The source host from which to connect.
* @param[in] localport The source port from which to connect.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_open_forward_unix(ssh_channel channel, const char *remotepath,
const char *sourcehost, int localport);
/**
* @brief Open a session channel .
*
* @param[in] channel The channel .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_open_session(ssh_channel channel);
/**
* @brief Open an X11 channel.
*
* @param[in] channel The channel .
* @param[in] orig_addr The source address .
* @param[in] orig_port The source port.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_open_x11(ssh_channel channel, const char *orig_addr, int orig_port);
LIBSSH_API int ssh_channel_poll(ssh_channel channel, int is_stderr);
LIBSSH_API int ssh_channel_poll_timeout(ssh_channel channel, int timeout, int is_stderr);
@@ -490,48 +631,287 @@ LIBSSH_API int ssh_channel_read(ssh_channel channel, void *dest, uint32_t count,
LIBSSH_API int ssh_channel_read_timeout(ssh_channel channel, void *dest, uint32_t count, int is_stderr, int timeout_ms);
LIBSSH_API int ssh_channel_read_nonblocking(ssh_channel channel, void *dest, uint32_t count,
int is_stderr);
/**
* @brief Set an environment variable on the channel.
*
* @param[in] channel The channel .
* @param[in] name The name of the variable.
* @param[in] value The value to set.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_env(ssh_channel channel, const char *name, const char *value);
/**
* @brief Run a command on the channel.
*
* @param[in] channel The channel .
* @param[in] cmd The command to run.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_exec(ssh_channel channel, const char *cmd);
/**
* @brief Request a PTY (pseudo-terminal) on the channel.
*
* @param[in] channel The channel .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_pty(ssh_channel channel);
/**
* @brief Request a PTY (pseudo-terminal) size on the channel.
*
* @param[in] channel The channel .
* @param[in] term The terminal type .
* @param[in] cols The number of columns.
* @param[in] rows The number of rows.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_pty_size(ssh_channel channel, const char *term,
int cols, int rows);
/**
* @brief Request a PTY (pseudo-terminal) size and modes on the channel.
*
* @param[in] channel The channel .
* @param[in] term The terminal type.
* @param[in] cols The number of columns.
* @param[in] rows The number of rows.
* @param[in] modes The encoded terminal modes.
* @param[in] modes_len The length of the modes data.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_pty_size_modes(ssh_channel channel, const char *term,
int cols, int rows, const unsigned char* modes, size_t modes_len);
/**
* @brief Request a shell on the channel.
*
* @param[in] channel The channel .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_shell(ssh_channel channel);
/**
* @brief Send a signal to the channel.
*
* @param[in] channel The channel .
* @param[in] signum The signal name .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_send_signal(ssh_channel channel, const char *signum);
/**
* @brief Send a break signal to the channel.
*
* @param[in] channel The channel .
* @param[in] length The length of the break in ms.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_send_break(ssh_channel channel, uint32_t length);
/**
* @brief Request the SFTP subsystem on the channel.
*
* @param[in] channel The channel .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_sftp(ssh_channel channel);
/**
* @brief Request a subsystem on the channel.
*
* @param[in] channel The channel .
* @param[in] subsystem The subsystem name.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_subsystem(ssh_channel channel, const char *subsystem);
LIBSSH_API int ssh_channel_request_x11(ssh_channel channel, int single_connection, const char *protocol,
const char *cookie, int screen_number);
/**
* @brief Request agent forwarding on the channel.
*
* @param[in] channel The channel .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_request_auth_agent(ssh_channel channel);
/**
* @brief Send EOF (End Of File) to the channel.
*
* @param[in] channel The channel .
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_send_eof(ssh_channel channel);
/**
* @brief Set the channel to blocking or non-blocking mode.
*
* @param[in] channel The channel .
* @param[in] blocking Set to 1 for blocking, 0 for non-blocking.
*/
LIBSSH_API void ssh_channel_set_blocking(ssh_channel channel, int blocking);
/**
* @brief Set the counter structure for the channel.
*
* @param[in] channel The channel .
* @param[in] counter The counter to update.
*/
LIBSSH_API void ssh_channel_set_counter(ssh_channel channel,
ssh_counter counter);
/**
* @brief Write data to the channel.
*
* @param[in] channel The channel .
* @param[in] data The data to be written.
* @param[in] len The length of the data.
*
* @return The number of bytes written, or SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_write(ssh_channel channel, const void *data, uint32_t len);
/**
* @brief Write data to the channel's standard error.
*
* @param[in] channel The channel .
* @param[in] data The data to be written.
* @param[in] len The length of the data.
*
* @return The number of bytes written, or SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_write_stderr(ssh_channel channel,
const void *data,
uint32_t len);
/**
* @brief Get the current window size of the channel.
*
* @param[in] channel The channel .
*
* @return The window size.
*/
LIBSSH_API uint32_t ssh_channel_window_size(ssh_channel channel);
/**
* @brief Get the file name from a path.
*
* @param[in] path The path.
*
* @return The base name, or NULL on error.
*/
LIBSSH_API char *ssh_basename (const char *path);
/**
* @brief Clean up and free a public key hash.
*
* @param[in,out] hash The hash to free.
*/
LIBSSH_API void ssh_clean_pubkey_hash(unsigned char **hash);
/**
* @brief Connects to the ssh server.
*
* @param[in] session The ssh session.
*
* @return SSH_OK on success (0), SSH_ERROR on error (-1).
*/
LIBSSH_API int ssh_connect(ssh_session session);
/**
* @brief Create a new connector.
*
* @param[in] session The session .
*
* @return A new connector, or NULL on error.
*/
LIBSSH_API ssh_connector ssh_connector_new(ssh_session session);
/**
* @brief Free a connector.
*
* @param[in] connector The connector to free.
*/
LIBSSH_API void ssh_connector_free(ssh_connector connector);
/**
* @brief Set the input channel for the connector.
*
* @param[in] connector The connector .
* @param[in] channel The channel .
* @param[in] flags Flags for the connector.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_connector_set_in_channel(ssh_connector connector,
ssh_channel channel,
enum ssh_connector_flags_e flags);
/**
* @brief Set the output channel for the connector.
*
* @param[in] connector The connector .
* @param[in] channel The channel .
* @param[in] flags Flags for the connector.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_connector_set_out_channel(ssh_connector connector,
ssh_channel channel,
enum ssh_connector_flags_e flags);
/**
* @brief Set the input file descriptor for the connector.
*
* @param[in] connector The connector .
* @param[in] fd The file descriptor.
*/
LIBSSH_API void ssh_connector_set_in_fd(ssh_connector connector, socket_t fd);
/**
* @brief Set the output file descriptor for the connector.
*
* @param[in] connector The connector .
* @param[in] fd The file descriptor.
*/
LIBSSH_API void ssh_connector_set_out_fd(ssh_connector connector, socket_t fd);
/**
* @brief Get the copyright information.
*
* @return The copyright string.
*/
LIBSSH_API const char *ssh_copyright(void);
/**
* @brief Disconnects from the ssh server.
*
* @param[in] session The ssh session to be disconnected.
*/
LIBSSH_API void ssh_disconnect(ssh_session session);
/**
* @brief Get the directory name from a path.
*
* @param[in] path The path.
*
* @return The directory name, or NULL on error.
*/
LIBSSH_API char *ssh_dirname (const char *path);
LIBSSH_API int ssh_finalize(void);
@@ -544,6 +924,16 @@ LIBSSH_API ssh_channel ssh_channel_open_forward_port(ssh_session session,
SSH_DEPRECATED LIBSSH_API ssh_channel ssh_channel_accept_forward(ssh_session session,
int timeout_ms,
int *destination_port);
/**
* @brief Cancel a reverse port forwarding.
*
* @param[in] session The ssh session.
* @param[in] address The address bound.
* @param[in] port The port bound.
*
* @return SSH_OK on success, SSH_ERROR on error.
*/
LIBSSH_API int ssh_channel_cancel_forward(ssh_session session,
const char *address,
int port);
@@ -552,7 +942,20 @@ LIBSSH_API int ssh_channel_listen_forward(ssh_session session,
int port,
int *bound_port);
/**
* @brief Free an ssh session.
*
* @param[in] session The session to free.
*/
LIBSSH_API void ssh_free(ssh_session session);
/**
* @brief Get the disconnect message from the server.
*
* @param[in] session The ssh session.
*
* @return The disconnect message, or NULL if none.
*/
LIBSSH_API const char *ssh_get_disconnect_message(ssh_session session);
LIBSSH_API const char *ssh_get_error(void *error);
LIBSSH_API int ssh_get_error_code(void *error);

1
src/server.c
View File

@@ -80,7 +80,6 @@
* The selection of algorithms and keys used are determined by the
* options that are currently set in the given ssh_session structure.
*/
int server_set_kex(ssh_session session)
{
struct ssh_kex_struct *server = &session->next_crypto->server_kex;