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libtelnet.h
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libtelnet.h
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/*!
* \brief libtelnet - TELNET protocol handling library
*
* SUMMARY:
*
* libtelnet is a library for handling the TELNET protocol. It includes
* routines for parsing incoming data from a remote peer as well as formatting
* data to send to the remote peer.
*
* libtelnet uses a callback-oriented API, allowing application-specific
* handling of various events. The callback system is also used for buffering
* outgoing protocol data, allowing the application to maintain control over
* the actual socket connection.
*
* Features supported include the full TELNET protocol, Q-method option
* negotiation, ZMP, MCCP2, MSSP, and NEW-ENVIRON.
*
* CONFORMS TO:
*
* RFC854 - http://www.faqs.org/rfcs/rfc854.html
* RFC855 - http://www.faqs.org/rfcs/rfc855.html
* RFC1091 - http://www.faqs.org/rfcs/rfc1091.html
* RFC1143 - http://www.faqs.org/rfcs/rfc1143.html
* RFC1408 - http://www.faqs.org/rfcs/rfc1408.html
* RFC1572 - http://www.faqs.org/rfcs/rfc1572.html
*
* LICENSE:
*
* The author or authors of this code dedicate any and all copyright interest
* in this code to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and successors. We
* intend this dedication to be an overt act of relinquishment in perpetuity of
* all present and future rights to this code under copyright law.
*
* \file libtelnet.h
*
* \version 0.23
*
* \author Sean Middleditch <sean@sourcemud.org>
*/
#if !defined(LIBTELNET_INCLUDE)
#define LIBTELNET_INCLUDE 1
/* standard C headers necessary for the libtelnet API */
#include <stdarg.h>
#include <stddef.h>
/* C++ support */
#if defined(__cplusplus)
extern "C" {
#endif
/* printf type checking feature in GCC and some other compilers */
#if __GNUC__
# define TELNET_GNU_PRINTF(f,a) __attribute__((format(printf, f, a))) /*!< internal helper */
# define TELNET_GNU_SENTINEL __attribute__((sentinel)) /*!< internal helper */
#else
# define TELNET_GNU_PRINTF(f,a) /*!< internal helper */
# define TELNET_GNU_SENTINEL /*!< internal helper */
#endif
/* Disable environ macro for Visual C++ 2015. */
#undef environ
/*! Telnet state tracker object type. */
typedef struct telnet_t telnet_t;
/*! Telnet event object type. */
typedef union telnet_event_t telnet_event_t;
/*! Telnet option table element type. */
typedef struct telnet_telopt_t telnet_telopt_t;
/*! \name Telnet commands */
/*@{*/
/*! Telnet commands and special values. */
#define TELNET_IAC 255
#define TELNET_DONT 254
#define TELNET_DO 253
#define TELNET_WONT 252
#define TELNET_WILL 251
#define TELNET_SB 250
#define TELNET_GA 249
#define TELNET_EL 248
#define TELNET_EC 247
#define TELNET_AYT 246
#define TELNET_AO 245
#define TELNET_IP 244
#define TELNET_BREAK 243
#define TELNET_DM 242
#define TELNET_NOP 241
#define TELNET_SE 240
#define TELNET_EOR 239
#define TELNET_ABORT 238
#define TELNET_SUSP 237
#define TELNET_EOF 236
/*@}*/
/*! \name Telnet option values. */
/*@{*/
/*! Telnet options. */
#define TELNET_TELOPT_BINARY 0
#define TELNET_TELOPT_ECHO 1
#define TELNET_TELOPT_RCP 2
#define TELNET_TELOPT_SGA 3
#define TELNET_TELOPT_NAMS 4
#define TELNET_TELOPT_STATUS 5
#define TELNET_TELOPT_TM 6
#define TELNET_TELOPT_RCTE 7
#define TELNET_TELOPT_NAOL 8
#define TELNET_TELOPT_NAOP 9
#define TELNET_TELOPT_NAOCRD 10
#define TELNET_TELOPT_NAOHTS 11
#define TELNET_TELOPT_NAOHTD 12
#define TELNET_TELOPT_NAOFFD 13
#define TELNET_TELOPT_NAOVTS 14
#define TELNET_TELOPT_NAOVTD 15
#define TELNET_TELOPT_NAOLFD 16
#define TELNET_TELOPT_XASCII 17
#define TELNET_TELOPT_LOGOUT 18
#define TELNET_TELOPT_BM 19
#define TELNET_TELOPT_DET 20
#define TELNET_TELOPT_SUPDUP 21
#define TELNET_TELOPT_SUPDUPOUTPUT 22
#define TELNET_TELOPT_SNDLOC 23
#define TELNET_TELOPT_TTYPE 24
#define TELNET_TELOPT_EOR 25
#define TELNET_TELOPT_TUID 26
#define TELNET_TELOPT_OUTMRK 27
#define TELNET_TELOPT_TTYLOC 28
#define TELNET_TELOPT_3270REGIME 29
#define TELNET_TELOPT_X3PAD 30
#define TELNET_TELOPT_NAWS 31
#define TELNET_TELOPT_TSPEED 32
#define TELNET_TELOPT_LFLOW 33
#define TELNET_TELOPT_LINEMODE 34
#define TELNET_TELOPT_XDISPLOC 35
#define TELNET_TELOPT_ENVIRON 36
#define TELNET_TELOPT_AUTHENTICATION 37
#define TELNET_TELOPT_ENCRYPT 38
#define TELNET_TELOPT_NEW_ENVIRON 39
#define TELNET_TELOPT_MSSP 70
#define TELNET_TELOPT_COMPRESS 85
#define TELNET_TELOPT_COMPRESS2 86
#define TELNET_TELOPT_ZMP 93
#define TELNET_TELOPT_EXOPL 255
#define TELNET_TELOPT_MCCP2 86
/*@}*/
/*! \name Protocol codes for TERMINAL-TYPE commands. */
/*@{*/
/*! TERMINAL-TYPE codes. */
#define TELNET_TTYPE_IS 0
#define TELNET_TTYPE_SEND 1
/*@}*/
/*! \name Protocol codes for NEW-ENVIRON/ENVIRON commands. */
/*@{*/
/*! NEW-ENVIRON/ENVIRON codes. */
#define TELNET_ENVIRON_IS 0
#define TELNET_ENVIRON_SEND 1
#define TELNET_ENVIRON_INFO 2
#define TELNET_ENVIRON_VAR 0
#define TELNET_ENVIRON_VALUE 1
#define TELNET_ENVIRON_ESC 2
#define TELNET_ENVIRON_USERVAR 3
/*@}*/
/*! \name Protocol codes for MSSP commands. */
/*@{*/
/*! MSSP codes. */
#define TELNET_MSSP_VAR 1
#define TELNET_MSSP_VAL 2
/*@}*/
/*! \name Telnet state tracker flags. */
/*@{*/
/*! Control behavior of telnet state tracker. */
#define TELNET_FLAG_PROXY (1<<0)
#define TELNET_FLAG_NVT_EOL (1<<1)
/* Internal-only bits in option flags */
#define TELNET_FLAG_TRANSMIT_BINARY (1<<5)
#define TELNET_FLAG_RECEIVE_BINARY (1<<6)
#define TELNET_PFLAG_DEFLATE (1<<7)
/*@}*/
/*!
* error codes
*/
enum telnet_error_t {
TELNET_EOK = 0, /*!< no error */
TELNET_EBADVAL, /*!< invalid parameter, or API misuse */
TELNET_ENOMEM, /*!< memory allocation failure */
TELNET_EOVERFLOW, /*!< data exceeds buffer size */
TELNET_EPROTOCOL, /*!< invalid sequence of special bytes */
TELNET_ECOMPRESS /*!< error handling compressed streams */
};
typedef enum telnet_error_t telnet_error_t; /*!< Error code type. */
/*!
* event codes
*/
enum telnet_event_type_t {
TELNET_EV_DATA = 0, /*!< raw text data has been received */
TELNET_EV_SEND, /*!< data needs to be sent to the peer */
TELNET_EV_IAC, /*!< generic IAC code received */
TELNET_EV_WILL, /*!< WILL option negotiation received */
TELNET_EV_WONT, /*!< WONT option neogitation received */
TELNET_EV_DO, /*!< DO option negotiation received */
TELNET_EV_DONT, /*!< DONT option negotiation received */
TELNET_EV_SUBNEGOTIATION, /*!< sub-negotiation data received */
TELNET_EV_COMPRESS, /*!< compression has been enabled */
TELNET_EV_ZMP, /*!< ZMP command has been received */
TELNET_EV_TTYPE, /*!< TTYPE command has been received */
TELNET_EV_ENVIRON, /*!< ENVIRON command has been received */
TELNET_EV_MSSP, /*!< MSSP command has been received */
TELNET_EV_WARNING, /*!< recoverable error has occured */
TELNET_EV_ERROR /*!< non-recoverable error has occured */
};
typedef enum telnet_event_type_t telnet_event_type_t; /*!< Telnet event type. */
/*!
* environ/MSSP command information
*/
struct telnet_environ_t {
unsigned char type; /*!< either TELNET_ENVIRON_VAR or TELNET_ENVIRON_USERVAR */
char *var; /*!< name of the variable being set */
char *value; /*!< value of variable being set; empty string if no value */
};
/*!
* event information
*/
union telnet_event_t {
/*!
* \brief Event type
*
* The type field will determine which of the other event structure fields
* have been filled in. For instance, if the event type is TELNET_EV_ZMP,
* then the zmp event field (and ONLY the zmp event field) will be filled
* in.
*/
enum telnet_event_type_t type;
/*!
* data event: for DATA and SEND events
*/
struct data_t {
enum telnet_event_type_t _type; /*!< alias for type */
const char *buffer; /*!< byte buffer */
size_t size; /*!< number of bytes in buffer */
} data; /*!< DATA and SEND */
/*!
* WARNING and ERROR events
*/
struct error_t {
enum telnet_event_type_t _type; /*!< alias for type */
const char *file; /*!< file the error occured in */
const char *func; /*!< function the error occured in */
const char *msg; /*!< error message string */
int line; /*!< line of file error occured on */
telnet_error_t errcode; /*!< error code */
} error; /*!< WARNING and ERROR */
/*!
* command event: for IAC
*/
struct iac_t {
enum telnet_event_type_t _type; /*!< alias for type */
unsigned char cmd; /*!< telnet command received */
} iac; /*!< IAC */
/*!
* negotiation event: WILL, WONT, DO, DONT
*/
struct negotiate_t {
enum telnet_event_type_t _type; /*!< alias for type */
unsigned char telopt; /*!< option being negotiated */
} neg; /*!< WILL, WONT, DO, DONT */
/*!
* subnegotiation event
*/
struct subnegotiate_t {
enum telnet_event_type_t _type; /*!< alias for type */
const char *buffer; /*!< data of sub-negotiation */
size_t size; /*!< number of bytes in buffer */
unsigned char telopt; /*!< option code for negotiation */
} sub; /*!< SB */
/*!
* ZMP event
*/
struct zmp_t {
enum telnet_event_type_t _type; /*!< alias for type */
const char **argv; /*!< array of argument string */
size_t argc; /*!< number of elements in argv */
} zmp; /*!< ZMP */
/*!
* TTYPE event
*/
struct ttype_t {
enum telnet_event_type_t _type; /*!< alias for type */
unsigned char cmd; /*!< TELNET_TTYPE_IS or TELNET_TTYPE_SEND */
const char* name; /*!< terminal type name (IS only) */
} ttype; /*!< TTYPE */
/*!
* COMPRESS event
*/
struct compress_t {
enum telnet_event_type_t _type; /*!< alias for type */
unsigned char state; /*!< 1 if compression is enabled,
0 if disabled */
} compress; /*!< COMPRESS */
/*!
* ENVIRON/NEW-ENVIRON event
*/
struct environ_t {
enum telnet_event_type_t _type; /*!< alias for type */
const struct telnet_environ_t *values; /*!< array of variable values */
size_t size; /*!< number of elements in values */
unsigned char cmd; /*!< SEND, IS, or INFO */
} environ; /*!< ENVIRON, NEW-ENVIRON */
/*!
* MSSP event
*/
struct mssp_t {
enum telnet_event_type_t _type; /*!< alias for type */
const struct telnet_environ_t *values; /*!< array of variable values */
size_t size; /*!< number of elements in values */
} mssp; /*!< MSSP */
};
/*!
* \brief event handler
*
* This is the type of function that must be passed to
* telnet_init() when creating a new telnet object. The
* function will be invoked once for every event generated
* by the libtelnet protocol parser.
*
* \param telnet The telnet object that generated the event
* \param event Event structure with details about the event
* \param user_data User-supplied pointer
*/
typedef void (*telnet_event_handler_t)(telnet_t *telnet,
telnet_event_t *event, void *user_data);
/*!
* telopt support table element; use telopt of -1 for end marker
*/
struct telnet_telopt_t {
short telopt; /*!< one of the TELOPT codes or -1 */
unsigned char us; /*!< TELNET_WILL or TELNET_WONT */
unsigned char him; /*!< TELNET_DO or TELNET_DONT */
};
/*!
* state tracker -- private data structure
*/
struct telnet_t;
/*!
* \brief Initialize a telnet state tracker.
*
* This function initializes a new state tracker, which is used for all
* other libtelnet functions. Each connection must have its own
* telnet state tracker object.
*
* \param telopts Table of TELNET options the application supports.
* \param eh Event handler function called for every event.
* \param flags 0 or TELNET_FLAG_PROXY.
* \param user_data Optional data pointer that will be passsed to eh.
* \return Telnet state tracker object.
*/
extern telnet_t* telnet_init(const telnet_telopt_t *telopts,
telnet_event_handler_t eh, unsigned char flags, void *user_data);
/*!
* \brief Free up any memory allocated by a state tracker.
*
* This function must be called when a telnet state tracker is no
* longer needed (such as after the connection has been closed) to
* release any memory resources used by the state tracker.
*
* \param telnet Telnet state tracker object.
*/
extern void telnet_free(telnet_t *telnet);
/*!
* \brief Push a byte buffer into the state tracker.
*
* Passes one or more bytes to the telnet state tracker for
* protocol parsing. The byte buffer is most often going to be
* the buffer that recv() was called for while handling the
* connection.
*
* \param telnet Telnet state tracker object.
* \param buffer Pointer to byte buffer.
* \param size Number of bytes pointed to by buffer.
*/
extern void telnet_recv(telnet_t *telnet, const char *buffer,
size_t size);
/*!
* \brief Send a telnet command.
*
* \param telnet Telnet state tracker object.
* \param cmd Command to send.
*/
extern void telnet_iac(telnet_t *telnet, unsigned char cmd);
/*!
* \brief Send negotiation command.
*
* Internally, libtelnet uses RFC1143 option negotiation rules.
* The negotiation commands sent with this function may be ignored
* if they are determined to be redundant.
*
* \param telnet Telnet state tracker object.
* \param cmd TELNET_WILL, TELNET_WONT, TELNET_DO, or TELNET_DONT.
* \param opt One of the TELNET_TELOPT_* values.
*/
extern void telnet_negotiate(telnet_t *telnet, unsigned char cmd,
unsigned char opt);
/*!
* Send non-command data (escapes IAC bytes).
*
* \param telnet Telnet state tracker object.
* \param buffer Buffer of bytes to send.
* \param size Number of bytes to send.
*/
extern void telnet_send(telnet_t *telnet,
const char *buffer, size_t size);
/*!
* Send non-command text (escapes IAC bytes and translates
* \\r -> CR-NUL and \\n -> CR-LF unless in BINARY mode.
*
* \param telnet Telnet state tracker object.
* \param buffer Buffer of bytes to send.
* \param size Number of bytes to send.
*/
extern void telnet_send_text(telnet_t *telnet,
const char *buffer, size_t size);
/*!
* \brief Begin a sub-negotiation command.
*
* Sends IAC SB followed by the telopt code. All following data sent
* will be part of the sub-negotiation, until telnet_finish_sb() is
* called.
*
* \param telnet Telnet state tracker object.
* \param telopt One of the TELNET_TELOPT_* values.
*/
extern void telnet_begin_sb(telnet_t *telnet,
unsigned char telopt);
/*!
* \brief Finish a sub-negotiation command.
*
* This must be called after a call to telnet_begin_sb() to finish a
* sub-negotiation command.
*
* \param telnet Telnet state tracker object.
*/
#define telnet_finish_sb(telnet) telnet_iac((telnet), TELNET_SE)
/*!
* \brief Shortcut for sending a complete subnegotiation buffer.
*
* Equivalent to:
* telnet_begin_sb(telnet, telopt);
* telnet_send(telnet, buffer, size);
* telnet_finish_sb(telnet);
*
* \param telnet Telnet state tracker format.
* \param telopt One of the TELNET_TELOPT_* values.
* \param buffer Byte buffer for sub-negotiation data.
* \param size Number of bytes to use for sub-negotiation data.
*/
extern void telnet_subnegotiation(telnet_t *telnet, unsigned char telopt,
const char *buffer, size_t size);
/*!
* \brief Begin sending compressed data.
*
* This function will begein sending data using the COMPRESS2 option,
* which enables the use of zlib to compress data sent to the client.
* The client must offer support for COMPRESS2 with option negotiation,
* and zlib support must be compiled into libtelnet.
*
* Only the server may call this command.
*
* \param telnet Telnet state tracker object.
*/
extern void telnet_begin_compress2(telnet_t *telnet);
/*!
* \brief Send formatted data.
*
* This function is a wrapper around telnet_send(). It allows using
* printf-style formatting.
*
* Additionally, this function will translate \\r to the CR NUL construct and
* \\n with CR LF, as well as automatically escaping IAC bytes like
* telnet_send().
*
* \param telnet Telnet state tracker object.
* \param fmt Format string.
* \return Number of bytes sent.
*/
extern int telnet_printf(telnet_t *telnet, const char *fmt, ...)
TELNET_GNU_PRINTF(2, 3);
/*!
* \brief Send formatted data.
*
* See telnet_printf().
*/
extern int telnet_vprintf(telnet_t *telnet, const char *fmt, va_list va);
/*!
* \brief Send formatted data (no newline escaping).
*
* This behaves identically to telnet_printf(), except that the \\r and \\n
* characters are not translated. The IAC byte is still escaped as normal
* with telnet_send().
*
* \param telnet Telnet state tracker object.
* \param fmt Format string.
* \return Number of bytes sent.
*/
extern int telnet_raw_printf(telnet_t *telnet, const char *fmt, ...)
TELNET_GNU_PRINTF(2, 3);
/*!
* \brief Send formatted data (no newline escaping).
*
* See telnet_raw_printf().
*/
extern int telnet_raw_vprintf(telnet_t *telnet, const char *fmt, va_list va);
/*!
* \brief Begin a new set of NEW-ENVIRON values to request or send.
*
* This function will begin the sub-negotiation block for sending or
* requesting NEW-ENVIRON values.
*
* The telnet_finish_newenviron() macro must be called after this
* function to terminate the NEW-ENVIRON command.
*
* \param telnet Telnet state tracker object.
* \param type One of TELNET_ENVIRON_SEND, TELNET_ENVIRON_IS, or
* TELNET_ENVIRON_INFO.
*/
extern void telnet_begin_newenviron(telnet_t *telnet, unsigned char type);
/*!
* \brief Send a NEW-ENVIRON variable name or value.
*
* This can only be called between calls to telnet_begin_newenviron() and
* telnet_finish_newenviron().
*
* \param telnet Telnet state tracker object.
* \param type One of TELNET_ENVIRON_VAR, TELNET_ENVIRON_USERVAR, or
* TELNET_ENVIRON_VALUE.
* \param string Variable name or value.
*/
extern void telnet_newenviron_value(telnet_t* telnet, unsigned char type,
const char *string);
/*!
* \brief Finish a NEW-ENVIRON command.
*
* This must be called after a call to telnet_begin_newenviron() to finish a
* NEW-ENVIRON variable list.
*
* \param telnet Telnet state tracker object.
*/
#define telnet_finish_newenviron(telnet) telnet_finish_sb((telnet))
/*!
* \brief Send the TERMINAL-TYPE SEND command.
*
* Sends the sequence IAC TERMINAL-TYPE SEND.
*
* \param telnet Telnet state tracker object.
*/
extern void telnet_ttype_send(telnet_t *telnet);
/*!
* \brief Send the TERMINAL-TYPE IS command.
*
* Sends the sequence IAC TERMINAL-TYPE IS "string".
*
* According to the RFC, the recipient of a TERMINAL-TYPE SEND shall
* send the next possible terminal-type the client supports. Upon sending
* the type, the client should switch modes to begin acting as the terminal
* type is just sent.
*
* The server may continue sending TERMINAL-TYPE IS until it receives a
* terminal type is understands. To indicate to the server that it has
* reached the end of the available optoins, the client must send the last
* terminal type a second time. When the server receives the same terminal
* type twice in a row, it knows it has seen all available terminal types.
*
* After the last terminal type is sent, if the client receives another
* TERMINAL-TYPE SEND command, it must begin enumerating the available
* terminal types from the very beginning. This allows the server to
* scan the available types for a preferred terminal type and, if none
* is found, to then ask the client to switch to an acceptable
* alternative.
*
* Note that if the client only supports a single terminal type, then
* simply sending that one type in response to every SEND will satisfy
* the behavior requirements.
*
* \param telnet Telnet state tracker object.
* \param ttype Name of the terminal-type being sent.
*/
extern void telnet_ttype_is(telnet_t *telnet, const char* ttype);
/*!
* \brief Send a ZMP command.
*
* \param telnet Telnet state tracker object.
* \param argc Number of ZMP commands being sent.
* \param argv Array of argument strings.
*/
extern void telnet_send_zmp(telnet_t *telnet, size_t argc, const char **argv);
/*!
* \brief Send a ZMP command.
*
* Arguments are listed out in var-args style. After the last argument, a
* NULL pointer must be passed in as a sentinel value.
*
* \param telnet Telnet state tracker object.
*/
extern void telnet_send_zmpv(telnet_t *telnet, ...) TELNET_GNU_SENTINEL;
/*!
* \brief Send a ZMP command.
*
* See telnet_send_zmpv().
*/
extern void telnet_send_vzmpv(telnet_t *telnet, va_list va);
/*!
* \brief Begin sending a ZMP command
*
* \param telnet Telnet state tracker object.
* \param cmd The first argument (command name) for the ZMP command.
*/
extern void telnet_begin_zmp(telnet_t *telnet, const char *cmd);
/*!
* \brief Send a ZMP command argument.
*
* \param telnet Telnet state tracker object.
* \param arg Telnet argument string.
*/
extern void telnet_zmp_arg(telnet_t *telnet, const char *arg);
/*!
* \brief Finish a ZMP command.
*
* This must be called after a call to telnet_begin_zmp() to finish a
* ZMP argument list.
*
* \param telnet Telnet state tracker object.
*/
#define telnet_finish_zmp(telnet) telnet_finish_sb((telnet))
/* C++ support */
#if defined(__cplusplus)
} /* extern "C" */
#endif
#endif /* !defined(LIBTELNET_INCLUDE) */