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putty/putty.h

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50 KiB
C
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#ifndef PUTTY_PUTTY_H
#define PUTTY_PUTTY_H
#include <stddef.h> /* for wchar_t */
/*
* Global variables. Most modules declare these `extern', but
* window.c will do `#define PUTTY_DO_GLOBALS' before including this
* module, and so will get them properly defined.
*/
#ifndef GLOBAL
#ifdef PUTTY_DO_GLOBALS
#define GLOBAL
#else
#define GLOBAL extern
#endif
#endif
#ifndef DONE_TYPEDEFS
#define DONE_TYPEDEFS
typedef struct conf_tag Conf;
typedef struct backend_tag Backend;
typedef struct terminal_tag Terminal;
#endif
#include "puttyps.h"
#include "network.h"
#include "misc.h"
/*
* Fingerprints of the PGP master keys that can be used to establish a trust
* path between an executable and other files.
*/
#define PGP_RSA_MASTER_KEY_FP \
"8F 15 97 DA 25 30 AB 0D 88 D1 92 54 11 CF 0C 4C"
#define PGP_DSA_MASTER_KEY_FP \
"313C 3E76 4B74 C2C5 F2AE 83A8 4F5E 6DF5 6A93 B34E"
/* Three attribute types:
* The ATTRs (normal attributes) are stored with the characters in
* the main display arrays
*
* The TATTRs (temporary attributes) are generated on the fly, they
* can overlap with characters but not with normal attributes.
*
* The LATTRs (line attributes) are an entirely disjoint space of
* flags.
*
* The DATTRs (display attributes) are internal to terminal.c (but
* defined here because their values have to match the others
* here); they reuse the TATTR_* space but are always masked off
* before sending to the front end.
*
* ATTR_INVALID is an illegal colour combination.
*/
#define TATTR_ACTCURS 0x40000000UL /* active cursor (block) */
#define TATTR_PASCURS 0x20000000UL /* passive cursor (box) */
#define TATTR_RIGHTCURS 0x10000000UL /* cursor-on-RHS */
#define TATTR_COMBINING 0x80000000UL /* combining characters */
#define DATTR_STARTRUN 0x80000000UL /* start of redraw run */
#define TDATTR_MASK 0xF0000000UL
#define TATTR_MASK (TDATTR_MASK)
#define DATTR_MASK (TDATTR_MASK)
#define LATTR_NORM 0x00000000UL
#define LATTR_WIDE 0x00000001UL
#define LATTR_TOP 0x00000002UL
#define LATTR_BOT 0x00000003UL
#define LATTR_MODE 0x00000003UL
#define LATTR_WRAPPED 0x00000010UL /* this line wraps to next */
#define LATTR_WRAPPED2 0x00000020UL /* with WRAPPED: CJK wide character
wrapped to next line, so last
single-width cell is empty */
#define ATTR_INVALID 0x03FFFFU
/* Like Linux use the F000 page for direct to font. */
#define CSET_OEMCP 0x0000F000UL /* OEM Codepage DTF */
#define CSET_ACP 0x0000F100UL /* Ansi Codepage DTF */
/* These are internal use overlapping with the UTF-16 surrogates */
#define CSET_ASCII 0x0000D800UL /* normal ASCII charset ESC ( B */
#define CSET_LINEDRW 0x0000D900UL /* line drawing charset ESC ( 0 */
#define CSET_SCOACS 0x0000DA00UL /* SCO Alternate charset */
#define CSET_GBCHR 0x0000DB00UL /* UK variant charset ESC ( A */
#define CSET_MASK 0xFFFFFF00UL /* Character set mask */
#define DIRECT_CHAR(c) ((c&0xFFFFFC00)==0xD800)
#define DIRECT_FONT(c) ((c&0xFFFFFE00)==0xF000)
#define UCSERR (CSET_LINEDRW|'a') /* UCS Format error character. */
/*
* UCSWIDE is a special value used in the terminal data to signify
* the character cell containing the right-hand half of a CJK wide
* character. We use 0xDFFF because it's part of the surrogate
* range and hence won't be used for anything else (it's impossible
* to input it via UTF-8 because our UTF-8 decoder correctly
* rejects surrogates).
*/
#define UCSWIDE 0xDFFF
#define ATTR_NARROW 0x800000U
#define ATTR_WIDE 0x400000U
#define ATTR_BOLD 0x040000U
#define ATTR_UNDER 0x080000U
#define ATTR_REVERSE 0x100000U
#define ATTR_BLINK 0x200000U
#define ATTR_FGMASK 0x0001FFU
#define ATTR_BGMASK 0x03FE00U
#define ATTR_COLOURS 0x03FFFFU
#define ATTR_FGSHIFT 0
#define ATTR_BGSHIFT 9
/*
* The definitive list of colour numbers stored in terminal
* attribute words is kept here. It is:
*
* - 0-7 are ANSI colours (KRGYBMCW).
* - 8-15 are the bold versions of those colours.
* - 16-255 are the remains of the xterm 256-colour mode (a
* 216-colour cube with R at most significant and B at least,
* followed by a uniform series of grey shades running between
* black and white but not including either on grounds of
* redundancy).
* - 256 is default foreground
* - 257 is default bold foreground
* - 258 is default background
* - 259 is default bold background
* - 260 is cursor foreground
* - 261 is cursor background
*/
#define ATTR_DEFFG (256 << ATTR_FGSHIFT)
#define ATTR_DEFBG (258 << ATTR_BGSHIFT)
#define ATTR_DEFAULT (ATTR_DEFFG | ATTR_DEFBG)
struct sesslist {
int nsessions;
char **sessions;
char *buffer; /* so memory can be freed later */
};
struct unicode_data {
char **uni_tbl;
int dbcs_screenfont;
int font_codepage;
int line_codepage;
wchar_t unitab_scoacs[256];
wchar_t unitab_line[256];
wchar_t unitab_font[256];
wchar_t unitab_xterm[256];
wchar_t unitab_oemcp[256];
unsigned char unitab_ctrl[256];
};
#define LGXF_OVR 1 /* existing logfile overwrite */
#define LGXF_APN 0 /* existing logfile append */
#define LGXF_ASK -1 /* existing logfile ask */
#define LGTYP_NONE 0 /* logmode: no logging */
#define LGTYP_ASCII 1 /* logmode: pure ascii */
#define LGTYP_DEBUG 2 /* logmode: all chars of traffic */
#define LGTYP_PACKETS 3 /* logmode: SSH data packets */
#define LGTYP_SSHRAW 4 /* logmode: SSH raw data */
typedef enum {
/* Actual special commands. Originally Telnet, but some codes have
* been re-used for similar specials in other protocols. */
TS_AYT, TS_BRK, TS_SYNCH, TS_EC, TS_EL, TS_GA, TS_NOP, TS_ABORT,
TS_AO, TS_IP, TS_SUSP, TS_EOR, TS_EOF, TS_LECHO, TS_RECHO, TS_PING,
TS_EOL,
/* Special command for SSH. */
TS_REKEY,
/* POSIX-style signals. (not Telnet) */
TS_SIGABRT, TS_SIGALRM, TS_SIGFPE, TS_SIGHUP, TS_SIGILL,
TS_SIGINT, TS_SIGKILL, TS_SIGPIPE, TS_SIGQUIT, TS_SIGSEGV,
TS_SIGTERM, TS_SIGUSR1, TS_SIGUSR2,
/* Pseudo-specials used for constructing the specials menu. */
TS_SEP, /* Separator */
TS_SUBMENU, /* Start a new submenu with specified name */
TS_EXITMENU /* Exit current submenu or end of specials */
} Telnet_Special;
struct telnet_special {
const char *name;
int code;
};
typedef enum {
MBT_NOTHING,
MBT_LEFT, MBT_MIDDLE, MBT_RIGHT, /* `raw' button designations */
MBT_SELECT, MBT_EXTEND, MBT_PASTE, /* `cooked' button designations */
MBT_WHEEL_UP, MBT_WHEEL_DOWN /* mouse wheel */
} Mouse_Button;
typedef enum {
MA_NOTHING, MA_CLICK, MA_2CLK, MA_3CLK, MA_DRAG, MA_RELEASE
} Mouse_Action;
/* Keyboard modifiers -- keys the user is actually holding down */
#define PKM_SHIFT 0x01
#define PKM_CONTROL 0x02
#define PKM_META 0x04
#define PKM_ALT 0x08
/* Keyboard flags that aren't really modifiers */
#define PKF_CAPSLOCK 0x10
#define PKF_NUMLOCK 0x20
#define PKF_REPEAT 0x40
/* Stand-alone keysyms for function keys */
typedef enum {
PK_NULL, /* No symbol for this key */
/* Main keypad keys */
PK_ESCAPE, PK_TAB, PK_BACKSPACE, PK_RETURN, PK_COMPOSE,
/* Editing keys */
PK_HOME, PK_INSERT, PK_DELETE, PK_END, PK_PAGEUP, PK_PAGEDOWN,
/* Cursor keys */
PK_UP, PK_DOWN, PK_RIGHT, PK_LEFT, PK_REST,
/* Numeric keypad */ /* Real one looks like: */
PK_PF1, PK_PF2, PK_PF3, PK_PF4, /* PF1 PF2 PF3 PF4 */
PK_KPCOMMA, PK_KPMINUS, PK_KPDECIMAL, /* 7 8 9 - */
PK_KP0, PK_KP1, PK_KP2, PK_KP3, PK_KP4, /* 4 5 6 , */
PK_KP5, PK_KP6, PK_KP7, PK_KP8, PK_KP9, /* 1 2 3 en- */
PK_KPBIGPLUS, PK_KPENTER, /* 0 . ter */
/* Top row */
PK_F1, PK_F2, PK_F3, PK_F4, PK_F5,
PK_F6, PK_F7, PK_F8, PK_F9, PK_F10,
PK_F11, PK_F12, PK_F13, PK_F14, PK_F15,
PK_F16, PK_F17, PK_F18, PK_F19, PK_F20,
PK_PAUSE
} Key_Sym;
#define PK_ISEDITING(k) ((k) >= PK_HOME && (k) <= PK_PAGEDOWN)
#define PK_ISCURSOR(k) ((k) >= PK_UP && (k) <= PK_REST)
#define PK_ISKEYPAD(k) ((k) >= PK_PF1 && (k) <= PK_KPENTER)
#define PK_ISFKEY(k) ((k) >= PK_F1 && (k) <= PK_F20)
enum {
VT_XWINDOWS, VT_OEMANSI, VT_OEMONLY, VT_POORMAN, VT_UNICODE
};
enum {
/*
* SSH-2 key exchange algorithms
*/
KEX_WARN,
KEX_DHGROUP1,
KEX_DHGROUP14,
KEX_DHGEX,
KEX_RSA,
KEX_MAX
};
enum {
/*
* SSH ciphers (both SSH-1 and SSH-2)
*/
CIPHER_WARN, /* pseudo 'cipher' */
CIPHER_3DES,
CIPHER_BLOWFISH,
CIPHER_AES, /* (SSH-2 only) */
CIPHER_DES,
CIPHER_ARCFOUR,
CIPHER_MAX /* no. ciphers (inc warn) */
};
enum {
/*
* Several different bits of the PuTTY configuration seem to be
* three-way settings whose values are `always yes', `always
* no', and `decide by some more complex automated means'. This
* is true of line discipline options (local echo and line
* editing), proxy DNS, Close On Exit, and SSH server bug
* workarounds. Accordingly I supply a single enum here to deal
* with them all.
*/
FORCE_ON, FORCE_OFF, AUTO
};
enum {
/*
* Proxy types.
*/
PROXY_NONE, PROXY_SOCKS4, PROXY_SOCKS5,
PROXY_HTTP, PROXY_TELNET, PROXY_CMD
};
enum {
/*
* Line discipline options which the backend might try to control.
*/
LD_EDIT, /* local line editing */
LD_ECHO /* local echo */
};
enum {
/* Actions on remote window title query */
TITLE_NONE, TITLE_EMPTY, TITLE_REAL
};
enum {
/* Protocol back ends. (CONF_protocol) */
PROT_RAW, PROT_TELNET, PROT_RLOGIN, PROT_SSH,
/* PROT_SERIAL is supported on a subset of platforms, but it doesn't
* hurt to define it globally. */
PROT_SERIAL
};
enum {
/* Bell settings (CONF_beep) */
BELL_DISABLED, BELL_DEFAULT, BELL_VISUAL, BELL_WAVEFILE, BELL_PCSPEAKER
};
enum {
/* Taskbar flashing indication on bell (CONF_beep_ind) */
B_IND_DISABLED, B_IND_FLASH, B_IND_STEADY
};
enum {
/* Resize actions (CONF_resize_action) */
RESIZE_TERM, RESIZE_DISABLED, RESIZE_FONT, RESIZE_EITHER
};
enum {
/* Function key types (CONF_funky_type) */
FUNKY_TILDE,
FUNKY_LINUX,
FUNKY_XTERM,
FUNKY_VT400,
FUNKY_VT100P,
FUNKY_SCO
};
enum {
FQ_DEFAULT, FQ_ANTIALIASED, FQ_NONANTIALIASED, FQ_CLEARTYPE
};
enum {
SER_PAR_NONE, SER_PAR_ODD, SER_PAR_EVEN, SER_PAR_MARK, SER_PAR_SPACE
};
enum {
SER_FLOW_NONE, SER_FLOW_XONXOFF, SER_FLOW_RTSCTS, SER_FLOW_DSRDTR
};
/*
* Tables of string <-> enum value mappings used in settings.c.
* Defined here so that backends can export their GSS library tables
* to the cross-platform settings code.
*/
struct keyvalwhere {
/*
* Two fields which define a string and enum value to be
* equivalent to each other.
*/
char *s;
int v;
/*
* The next pair of fields are used by gprefs() in settings.c to
* arrange that when it reads a list of strings representing a
* preference list and translates it into the corresponding list
* of integers, strings not appearing in the list are entered in a
* configurable position rather than uniformly at the end.
*/
/*
* 'vrel' indicates which other value in the list to place this
* element relative to. It should be a value that has occurred in
* a 'v' field of some other element of the array, or -1 to
* indicate that we simply place relative to one or other end of
* the list.
*
* gprefs will try to process the elements in an order which makes
* this field work (i.e. so that the element referenced has been
* added before processing this one).
*/
int vrel;
/*
* 'where' indicates whether to place the new value before or
* after the one referred to by vrel. -1 means before; +1 means
* after.
*
* When vrel is -1, this also implicitly indicates which end of
* the array to use. So vrel=-1, where=-1 means to place _before_
* some end of the list (hence, at the last element); vrel=-1,
* where=+1 means to place _after_ an end (hence, at the first).
*/
int where;
};
#ifndef NO_GSSAPI
extern const int ngsslibs;
extern const char *const gsslibnames[]; /* for displaying in configuration */
extern const struct keyvalwhere gsslibkeywords[]; /* for settings.c */
#endif
extern const char *const ttymodes[];
enum {
/*
* Network address types. Used for specifying choice of IPv4/v6
* in config; also used in proxy.c to indicate whether a given
* host name has already been resolved or will be resolved at
* the proxy end.
*/
ADDRTYPE_UNSPEC, ADDRTYPE_IPV4, ADDRTYPE_IPV6, ADDRTYPE_NAME
};
struct backend_tag {
const char *(*init) (void *frontend_handle, void **backend_handle,
Conf *conf, char *host, int port, char **realhost,
int nodelay, int keepalive);
void (*free) (void *handle);
/* back->reconfig() passes in a replacement configuration. */
void (*reconfig) (void *handle, Conf *conf);
/* back->send() returns the current amount of buffered data. */
int (*send) (void *handle, char *buf, int len);
/* back->sendbuffer() does the same thing but without attempting a send */
int (*sendbuffer) (void *handle);
void (*size) (void *handle, int width, int height);
void (*special) (void *handle, Telnet_Special code);
const struct telnet_special *(*get_specials) (void *handle);
int (*connected) (void *handle);
int (*exitcode) (void *handle);
/* If back->sendok() returns FALSE, data sent to it from the frontend
* may be lost. */
int (*sendok) (void *handle);
int (*ldisc) (void *handle, int);
void (*provide_ldisc) (void *handle, void *ldisc);
void (*provide_logctx) (void *handle, void *logctx);
/*
* back->unthrottle() tells the back end that the front end
* buffer is clearing.
*/
void (*unthrottle) (void *handle, int);
int (*cfg_info) (void *handle);
char *name;
int protocol;
int default_port;
};
extern Backend *backends[];
/*
* Suggested default protocol provided by the backend link module.
* The application is free to ignore this.
*/
extern const int be_default_protocol;
/*
* Name of this particular application, for use in the config box
* and other pieces of text.
*/
extern const char *const appname;
/*
* Some global flags denoting the type of application.
*
* FLAG_VERBOSE is set when the user requests verbose details.
*
* FLAG_STDERR is set in command-line applications (which have a
* functioning stderr that it makes sense to write to) and not in
* GUI applications (which don't).
*
* FLAG_INTERACTIVE is set when a full interactive shell session is
* being run, _either_ because no remote command has been provided
* _or_ because the application is GUI and can't run non-
* interactively.
*
* These flags describe the type of _application_ - they wouldn't
* vary between individual sessions - and so it's OK to have this
* variable be GLOBAL.
*
* Note that additional flags may be defined in platform-specific
* headers. It's probably best if those ones start from 0x1000, to
* avoid collision.
*/
#define FLAG_VERBOSE 0x0001
#define FLAG_STDERR 0x0002
#define FLAG_INTERACTIVE 0x0004
GLOBAL int flags;
/*
* Likewise, these two variables are set up when the application
* initialises, and inform all default-settings accesses after
* that.
*/
GLOBAL int default_protocol;
GLOBAL int default_port;
/*
* This is set TRUE by cmdline.c iff a session is loaded with "-load".
*/
GLOBAL int loaded_session;
/*
* This is set to the name of the loaded session.
*/
GLOBAL char *cmdline_session_name;
struct RSAKey; /* be a little careful of scope */
/*
* Mechanism for getting text strings such as usernames and passwords
* from the front-end.
* The fields are mostly modelled after SSH's keyboard-interactive auth.
* FIXME We should probably mandate a character set/encoding (probably UTF-8).
*
* Since many of the pieces of text involved may be chosen by the server,
* the caller must take care to ensure that the server can't spoof locally-
* generated prompts such as key passphrase prompts. Some ground rules:
* - If the front-end needs to truncate a string, it should lop off the
* end.
* - The front-end should filter out any dangerous characters and
* generally not trust the strings. (But \n is required to behave
* vaguely sensibly, at least in `instruction', and ideally in
* `prompt[]' too.)
*/
typedef struct {
char *prompt;
int echo;
/*
* 'result' must be a dynamically allocated array of exactly
* 'resultsize' chars. The code for actually reading input may
* realloc it bigger (and adjust resultsize accordingly) if it has
* to. The caller should free it again when finished with it.
*
* If resultsize==0, then result may be NULL. When setting up a
* prompt_t, it's therefore easiest to initialise them this way,
* which means all actual allocation is done by the callee. This
* is what add_prompt does.
*/
char *result;
size_t resultsize;
} prompt_t;
typedef struct {
/*
* Indicates whether the information entered is to be used locally
* (for instance a key passphrase prompt), or is destined for the wire.
* This is a hint only; the front-end is at liberty not to use this
* information (so the caller should ensure that the supplied text is
* sufficient).
*/
int to_server;
char *name; /* Short description, perhaps for dialog box title */
int name_reqd; /* Display of `name' required or optional? */
char *instruction; /* Long description, maybe with embedded newlines */
int instr_reqd; /* Display of `instruction' required or optional? */
size_t n_prompts; /* May be zero (in which case display the foregoing,
* if any, and return success) */
prompt_t **prompts;
void *frontend;
void *data; /* slot for housekeeping data, managed by
* get_userpass_input(); initially NULL */
} prompts_t;
prompts_t *new_prompts(void *frontend);
void add_prompt(prompts_t *p, char *promptstr, int echo);
void prompt_set_result(prompt_t *pr, const char *newstr);
void prompt_ensure_result_size(prompt_t *pr, int len);
/* Burn the evidence. (Assumes _all_ strings want free()ing.) */
void free_prompts(prompts_t *p);
/*
* Exports from the front end.
*/
void request_resize(void *frontend, int, int);
void do_text(Context, int, int, wchar_t *, int, unsigned long, int);
void do_cursor(Context, int, int, wchar_t *, int, unsigned long, int);
int char_width(Context ctx, int uc);
#ifdef OPTIMISE_SCROLL
void do_scroll(Context, int, int, int);
#endif
void set_title(void *frontend, char *);
void set_icon(void *frontend, char *);
void set_sbar(void *frontend, int, int, int);
Context get_ctx(void *frontend);
void free_ctx(Context);
void palette_set(void *frontend, int, int, int, int);
void palette_reset(void *frontend);
void write_aclip(void *frontend, char *, int, int);
void write_clip(void *frontend, wchar_t *, int *, int, int);
void get_clip(void *frontend, wchar_t **, int *);
void optimised_move(void *frontend, int, int, int);
void set_raw_mouse_mode(void *frontend, int);
void connection_fatal(void *frontend, char *, ...);
void nonfatal(char *, ...);
void fatalbox(char *, ...);
void modalfatalbox(char *, ...);
#ifdef macintosh
#pragma noreturn(fatalbox)
#pragma noreturn(modalfatalbox)
#endif
void do_beep(void *frontend, int);
void begin_session(void *frontend);
void sys_cursor(void *frontend, int x, int y);
void request_paste(void *frontend);
void frontend_keypress(void *frontend);
void ldisc_update(void *frontend, int echo, int edit);
/* It's the backend's responsibility to invoke this at the start of a
* connection, if necessary; it can also invoke it later if the set of
* special commands changes. It does not need to invoke it at session
* shutdown. */
void update_specials_menu(void *frontend);
int from_backend(void *frontend, int is_stderr, const char *data, int len);
int from_backend_untrusted(void *frontend, const char *data, int len);
/* Called when the back end wants to indicate that EOF has arrived on
* the server-to-client stream. Returns FALSE to indicate that we
* intend to keep the session open in the other direction, or TRUE to
* indicate that if they're closing so are we. */
int from_backend_eof(void *frontend);
void notify_remote_exit(void *frontend);
/* Get a sensible value for a tty mode. NULL return = don't set.
* Otherwise, returned value should be freed by caller. */
char *get_ttymode(void *frontend, const char *mode);
/*
* >0 = `got all results, carry on'
* 0 = `user cancelled' (FIXME distinguish "give up entirely" and "next auth"?)
* <0 = `please call back later with more in/inlen'
*/
int get_userpass_input(prompts_t *p, unsigned char *in, int inlen);
#define OPTIMISE_IS_SCROLL 1
void set_iconic(void *frontend, int iconic);
void move_window(void *frontend, int x, int y);
void set_zorder(void *frontend, int top);
void refresh_window(void *frontend);
void set_zoomed(void *frontend, int zoomed);
int is_iconic(void *frontend);
void get_window_pos(void *frontend, int *x, int *y);
void get_window_pixels(void *frontend, int *x, int *y);
char *get_window_title(void *frontend, int icon);
/* Hint from backend to frontend about time-consuming operations.
* Initial state is assumed to be BUSY_NOT. */
enum {
BUSY_NOT, /* Not busy, all user interaction OK */
BUSY_WAITING, /* Waiting for something; local event loops still running
so some local interaction (e.g. menus) OK, but network
stuff is suspended */
BUSY_CPU /* Locally busy (e.g. crypto); user interaction suspended */
};
void set_busy_status(void *frontend, int status);
void cleanup_exit(int);
/*
* Exports from conf.c, and a big enum (via parametric macro) of
* configuration option keys.
*/
#define CONFIG_OPTIONS(X) \
/* X(value-type, subkey-type, keyword) */ \
X(STR, NONE, host) \
X(INT, NONE, port) \
X(INT, NONE, protocol) \
X(INT, NONE, addressfamily) \
X(INT, NONE, close_on_exit) \
X(INT, NONE, warn_on_close) \
X(INT, NONE, ping_interval) /* in seconds */ \
X(INT, NONE, tcp_nodelay) \
X(INT, NONE, tcp_keepalives) \
X(STR, NONE, loghost) /* logical host being contacted, for host key check */ \
/* Proxy options */ \
X(STR, NONE, proxy_exclude_list) \
X(INT, NONE, proxy_dns) \
X(INT, NONE, even_proxy_localhost) \
X(INT, NONE, proxy_type) \
X(STR, NONE, proxy_host) \
X(INT, NONE, proxy_port) \
X(STR, NONE, proxy_username) \
X(STR, NONE, proxy_password) \
X(STR, NONE, proxy_telnet_command) \
/* SSH options */ \
X(STR, NONE, remote_cmd) \
X(STR, NONE, remote_cmd2) /* fallback if remote_cmd fails; never loaded or saved */ \
X(INT, NONE, nopty) \
X(INT, NONE, compression) \
X(INT, INT, ssh_kexlist) \
X(INT, NONE, ssh_rekey_time) /* in minutes */ \
X(STR, NONE, ssh_rekey_data) /* string encoding e.g. "100K", "2M", "1G" */ \
X(INT, NONE, tryagent) \
X(INT, NONE, agentfwd) \
X(INT, NONE, change_username) /* allow username switching in SSH-2 */ \
X(INT, INT, ssh_cipherlist) \
X(FILENAME, NONE, keyfile) \
X(INT, NONE, sshprot) /* use v1 or v2 when both available */ \
X(INT, NONE, ssh2_des_cbc) /* "des-cbc" unrecommended SSH-2 cipher */ \
X(INT, NONE, ssh_no_userauth) /* bypass "ssh-userauth" (SSH-2 only) */ \
X(INT, NONE, ssh_show_banner) /* show USERAUTH_BANNERs (SSH-2 only) */ \
X(INT, NONE, try_tis_auth) \
X(INT, NONE, try_ki_auth) \
X(INT, NONE, try_gssapi_auth) /* attempt gssapi auth */ \
X(INT, NONE, gssapifwd) /* forward tgt via gss */ \
X(INT, INT, ssh_gsslist) /* preference order for local GSS libs */ \
X(FILENAME, NONE, ssh_gss_custom) \
X(INT, NONE, ssh_subsys) /* run a subsystem rather than a command */ \
X(INT, NONE, ssh_subsys2) /* fallback to go with remote_cmd_ptr2 */ \
X(INT, NONE, ssh_no_shell) /* avoid running a shell */ \
X(STR, NONE, ssh_nc_host) /* host to connect to in `nc' mode */ \
X(INT, NONE, ssh_nc_port) /* port to connect to in `nc' mode */ \
/* Telnet options */ \
X(STR, NONE, termtype) \
X(STR, NONE, termspeed) \
X(STR, STR, ttymodes) /* values are "Vvalue" or "A" */ \
X(STR, STR, environmt) \
X(STR, NONE, username) \
X(INT, NONE, username_from_env) \
X(STR, NONE, localusername) \
X(INT, NONE, rfc_environ) \
X(INT, NONE, passive_telnet) \
/* Serial port options */ \
X(STR, NONE, serline) \
X(INT, NONE, serspeed) \
X(INT, NONE, serdatabits) \
X(INT, NONE, serstopbits) \
X(INT, NONE, serparity) \
X(INT, NONE, serflow) \
/* Keyboard options */ \
X(INT, NONE, bksp_is_delete) \
X(INT, NONE, rxvt_homeend) \
X(INT, NONE, funky_type) \
X(INT, NONE, no_applic_c) /* totally disable app cursor keys */ \
X(INT, NONE, no_applic_k) /* totally disable app keypad */ \
X(INT, NONE, no_mouse_rep) /* totally disable mouse reporting */ \
X(INT, NONE, no_remote_resize) /* disable remote resizing */ \
X(INT, NONE, no_alt_screen) /* disable alternate screen */ \
X(INT, NONE, no_remote_wintitle) /* disable remote retitling */ \
X(INT, NONE, no_dbackspace) /* disable destructive backspace */ \
X(INT, NONE, no_remote_charset) /* disable remote charset config */ \
X(INT, NONE, remote_qtitle_action) /* remote win title query action */ \
X(INT, NONE, app_cursor) \
X(INT, NONE, app_keypad) \
X(INT, NONE, nethack_keypad) \
X(INT, NONE, telnet_keyboard) \
X(INT, NONE, telnet_newline) \
X(INT, NONE, alt_f4) /* is it special? */ \
X(INT, NONE, alt_space) /* is it special? */ \
X(INT, NONE, alt_only) /* is it special? */ \
X(INT, NONE, localecho) \
X(INT, NONE, localedit) \
X(INT, NONE, alwaysontop) \
X(INT, NONE, fullscreenonaltenter) \
X(INT, NONE, scroll_on_key) \
X(INT, NONE, scroll_on_disp) \
X(INT, NONE, erase_to_scrollback) \
X(INT, NONE, compose_key) \
X(INT, NONE, ctrlaltkeys) \
X(STR, NONE, wintitle) /* initial window title */ \
/* Terminal options */ \
X(INT, NONE, savelines) \
X(INT, NONE, dec_om) \
X(INT, NONE, wrap_mode) \
X(INT, NONE, lfhascr) \
X(INT, NONE, cursor_type) /* 0=block 1=underline 2=vertical */ \
X(INT, NONE, blink_cur) \
X(INT, NONE, beep) \
X(INT, NONE, beep_ind) \
X(INT, NONE, bellovl) /* bell overload protection active? */ \
X(INT, NONE, bellovl_n) /* number of bells to cause overload */ \
X(INT, NONE, bellovl_t) /* time interval for overload (seconds) */ \
X(INT, NONE, bellovl_s) /* period of silence to re-enable bell (s) */ \
X(FILENAME, NONE, bell_wavefile) \
X(INT, NONE, scrollbar) \
X(INT, NONE, scrollbar_in_fullscreen) \
X(INT, NONE, resize_action) \
X(INT, NONE, bce) \
X(INT, NONE, blinktext) \
X(INT, NONE, win_name_always) \
X(INT, NONE, width) \
X(INT, NONE, height) \
X(FONT, NONE, font) \
X(INT, NONE, font_quality) \
X(FILENAME, NONE, logfilename) \
X(INT, NONE, logtype) \
X(INT, NONE, logxfovr) \
X(INT, NONE, logflush) \
X(INT, NONE, logomitpass) \
X(INT, NONE, logomitdata) \
X(INT, NONE, hide_mouseptr) \
X(INT, NONE, sunken_edge) \
X(INT, NONE, window_border) \
X(STR, NONE, answerback) \
X(STR, NONE, printer) \
X(INT, NONE, arabicshaping) \
X(INT, NONE, bidi) \
/* Colour options */ \
X(INT, NONE, ansi_colour) \
X(INT, NONE, xterm_256_colour) \
X(INT, NONE, system_colour) \
X(INT, NONE, try_palette) \
X(INT, NONE, bold_style) \
X(INT, INT, colours) \
/* Selection options */ \
X(INT, NONE, mouse_is_xterm) \
X(INT, NONE, rect_select) \
X(INT, NONE, rawcnp) \
X(INT, NONE, rtf_paste) \
X(INT, NONE, mouse_override) \
X(INT, INT, wordness) \
/* translations */ \
X(INT, NONE, vtmode) \
X(STR, NONE, line_codepage) \
X(INT, NONE, cjk_ambig_wide) \
X(INT, NONE, utf8_override) \
X(INT, NONE, xlat_capslockcyr) \
/* X11 forwarding */ \
X(INT, NONE, x11_forward) \
X(STR, NONE, x11_display) \
X(INT, NONE, x11_auth) \
X(FILENAME, NONE, xauthfile) \
/* port forwarding */ \
X(INT, NONE, lport_acceptall) /* accept conns from hosts other than localhost */ \
X(INT, NONE, rport_acceptall) /* same for remote forwarded ports (SSH-2 only) */ \
/* \
* Subkeys for 'portfwd' can have the following forms: \
* \
* [LR]localport \
* [LR]localaddr:localport \
* \
* Dynamic forwardings are indicated by an 'L' key, and the \
* special value "D". For all other forwardings, the value \
* should be of the form 'host:port'. \
*/ \
X(STR, STR, portfwd) \
/* SSH bug compatibility modes */ \
X(INT, NONE, sshbug_ignore1) \
X(INT, NONE, sshbug_plainpw1) \
X(INT, NONE, sshbug_rsa1) \
X(INT, NONE, sshbug_hmac2) \
X(INT, NONE, sshbug_derivekey2) \
X(INT, NONE, sshbug_rsapad2) \
X(INT, NONE, sshbug_pksessid2) \
X(INT, NONE, sshbug_rekey2) \
X(INT, NONE, sshbug_maxpkt2) \
X(INT, NONE, sshbug_ignore2) \
X(INT, NONE, sshbug_winadj) \
/* \
* ssh_simple means that we promise never to open any channel \
* other than the main one, which means it can safely use a very \
* large window in SSH-2. \
*/ \
X(INT, NONE, ssh_simple) \
/* Options for pterm. Should split out into platform-dependent part. */ \
X(INT, NONE, stamp_utmp) \
X(INT, NONE, login_shell) \
X(INT, NONE, scrollbar_on_left) \
X(INT, NONE, shadowbold) \
X(FONT, NONE, boldfont) \
X(FONT, NONE, widefont) \
X(FONT, NONE, wideboldfont) \
X(INT, NONE, shadowboldoffset) \
X(INT, NONE, crhaslf) \
X(STR, NONE, winclass) \
/* Now define the actual enum of option keywords using that macro. */
#define CONF_ENUM_DEF(valtype, keytype, keyword) CONF_ ## keyword,
enum config_primary_key { CONFIG_OPTIONS(CONF_ENUM_DEF) N_CONFIG_OPTIONS };
#undef CONF_ENUM_DEF
#define NCFGCOLOURS 22 /* number of colours in CONF_colours above */
/* Functions handling configuration structures. */
Conf *conf_new(void); /* create an empty configuration */
void conf_free(Conf *conf);
Conf *conf_copy(Conf *oldconf);
void conf_copy_into(Conf *dest, Conf *src);
/* Mandatory accessor functions: enforce by assertion that keys exist. */
int conf_get_int(Conf *conf, int key);
int conf_get_int_int(Conf *conf, int key, int subkey);
char *conf_get_str(Conf *conf, int key); /* result still owned by conf */
char *conf_get_str_str(Conf *conf, int key, const char *subkey);
Filename *conf_get_filename(Conf *conf, int key);
FontSpec *conf_get_fontspec(Conf *conf, int key); /* still owned by conf */
/* Optional accessor function: return NULL if key does not exist. */
char *conf_get_str_str_opt(Conf *conf, int key, const char *subkey);
/* Accessor function to step through a string-subkeyed list.
* Returns the next subkey after the provided one, or the first if NULL.
* Returns NULL if there are none left.
* Both the return value and *subkeyout are still owned by conf. */
char *conf_get_str_strs(Conf *conf, int key, char *subkeyin, char **subkeyout);
/* Return the nth string subkey in a list. Owned by conf. NULL if beyond end */
char *conf_get_str_nthstrkey(Conf *conf, int key, int n);
/* Functions to set entries in configuration. Always copy their inputs. */
void conf_set_int(Conf *conf, int key, int value);
void conf_set_int_int(Conf *conf, int key, int subkey, int value);
void conf_set_str(Conf *conf, int key, const char *value);
void conf_set_str_str(Conf *conf, int key,
const char *subkey, const char *val);
void conf_del_str_str(Conf *conf, int key, const char *subkey);
void conf_set_filename(Conf *conf, int key, const Filename *val);
void conf_set_fontspec(Conf *conf, int key, const FontSpec *val);
/* Serialisation functions for Duplicate Session */
int conf_serialised_size(Conf *conf);
void conf_serialise(Conf *conf, void *data);
int conf_deserialise(Conf *conf, void *data, int maxsize);/*returns size used*/
/*
* Functions to copy, free, serialise and deserialise FontSpecs.
* Provided per-platform, to go with the platform's idea of a
* FontSpec's contents.
*
* fontspec_serialise returns the number of bytes written, and can
* handle data==NULL without crashing. So you can call it once to find
* out a size, then again once you've allocated a buffer.
*/
FontSpec *fontspec_copy(const FontSpec *f);
void fontspec_free(FontSpec *f);
int fontspec_serialise(FontSpec *f, void *data);
FontSpec *fontspec_deserialise(void *data, int maxsize, int *used);
/*
* Exports from noise.c.
*/
void noise_get_heavy(void (*func) (void *, int));
void noise_get_light(void (*func) (void *, int));
void noise_regular(void);
void noise_ultralight(unsigned long data);
void random_save_seed(void);
void random_destroy_seed(void);
/*
* Exports from settings.c.
*/
Backend *backend_from_name(const char *name);
Backend *backend_from_proto(int proto);
char *get_remote_username(Conf *conf); /* dynamically allocated */
char *save_settings(char *section, Conf *conf);
void save_open_settings(void *sesskey, Conf *conf);
void load_settings(char *section, Conf *conf);
void load_open_settings(void *sesskey, Conf *conf);
void get_sesslist(struct sesslist *, int allocate);
void do_defaults(char *, Conf *);
void registry_cleanup(void);
/*
* Functions used by settings.c to provide platform-specific
* default settings.
*
* (The integer one is expected to return `def' if it has no clear
* opinion of its own. This is because there's no integer value
* which I can reliably set aside to indicate `nil'. The string
* function is perfectly all right returning NULL, of course. The
* Filename and FontSpec functions are _not allowed_ to fail to
* return, since these defaults _must_ be per-platform.)
*
* The 'Filename *' returned by platform_default_filename, and the
* 'FontSpec *' returned by platform_default_fontspec, have ownership
* transferred to the caller, and must be freed.
*/
char *platform_default_s(const char *name);
int platform_default_i(const char *name, int def);
Filename *platform_default_filename(const char *name);
FontSpec *platform_default_fontspec(const char *name);
/*
* Exports from terminal.c.
*/
Terminal *term_init(Conf *, struct unicode_data *, void *);
void term_free(Terminal *);
void term_size(Terminal *, int, int, int);
void term_paint(Terminal *, Context, int, int, int, int, int);
void term_scroll(Terminal *, int, int);
void term_scroll_to_selection(Terminal *, int);
void term_pwron(Terminal *, int);
void term_clrsb(Terminal *);
void term_mouse(Terminal *, Mouse_Button, Mouse_Button, Mouse_Action,
int,int,int,int,int);
void term_key(Terminal *, Key_Sym, wchar_t *, size_t, unsigned int,
unsigned int);
void term_deselect(Terminal *);
void term_update(Terminal *);
void term_invalidate(Terminal *);
void term_blink(Terminal *, int set_cursor);
void term_do_paste(Terminal *);
int term_paste_pending(Terminal *);
void term_paste(Terminal *);
void term_nopaste(Terminal *);
int term_ldisc(Terminal *, int option);
void term_copyall(Terminal *);
void term_reconfig(Terminal *, Conf *);
void term_seen_key_event(Terminal *);
int term_data(Terminal *, int is_stderr, const char *data, int len);
int term_data_untrusted(Terminal *, const char *data, int len);
void term_provide_resize_fn(Terminal *term,
void (*resize_fn)(void *, int, int),
void *resize_ctx);
void term_provide_logctx(Terminal *term, void *logctx);
void term_set_focus(Terminal *term, int has_focus);
char *term_get_ttymode(Terminal *term, const char *mode);
int term_get_userpass_input(Terminal *term, prompts_t *p,
unsigned char *in, int inlen);
int format_arrow_key(char *buf, Terminal *term, int xkey, int ctrl);
/*
* Exports from logging.c.
*/
void *log_init(void *frontend, Conf *conf);
void log_free(void *logctx);
void log_reconfig(void *logctx, Conf *conf);
void logfopen(void *logctx);
void logfclose(void *logctx);
void logtraffic(void *logctx, unsigned char c, int logmode);
void logflush(void *logctx);
void log_eventlog(void *logctx, const char *string);
enum { PKT_INCOMING, PKT_OUTGOING };
enum { PKTLOG_EMIT, PKTLOG_BLANK, PKTLOG_OMIT };
struct logblank_t {
int offset;
int len;
int type;
};
void log_packet(void *logctx, int direction, int type,
char *texttype, const void *data, int len,
int n_blanks, const struct logblank_t *blanks,
const unsigned long *sequence);
/*
* Exports from testback.c
*/
extern Backend null_backend;
extern Backend loop_backend;
/*
* Exports from raw.c.
*/
extern Backend raw_backend;
/*
* Exports from rlogin.c.
*/
extern Backend rlogin_backend;
/*
* Exports from telnet.c.
*/
extern Backend telnet_backend;
/*
* Exports from ssh.c.
*/
extern Backend ssh_backend;
/*
* Exports from ldisc.c.
*/
void *ldisc_create(Conf *, Terminal *, Backend *, void *, void *);
void ldisc_configure(void *, Conf *);
void ldisc_free(void *);
void ldisc_send(void *handle, char *buf, int len, int interactive);
/*
* Exports from ldiscucs.c.
*/
void lpage_send(void *, int codepage, char *buf, int len, int interactive);
void luni_send(void *, wchar_t * widebuf, int len, int interactive);
/*
* Exports from sshrand.c.
*/
void random_add_noise(void *noise, int length);
int random_byte(void);
void random_get_savedata(void **data, int *len);
extern int random_active;
/* The random number subsystem is activated if at least one other entity
* within the program expresses an interest in it. So each SSH session
* calls random_ref on startup and random_unref on shutdown. */
void random_ref(void);
void random_unref(void);
/*
* Exports from pinger.c.
*/
typedef struct pinger_tag *Pinger;
Pinger pinger_new(Conf *conf, Backend *back, void *backhandle);
void pinger_reconfig(Pinger, Conf *oldconf, Conf *newconf);
void pinger_free(Pinger);
/*
* Exports from misc.c.
*/
#include "misc.h"
int conf_launchable(Conf *conf);
char const *conf_dest(Conf *conf);
/*
* Exports from sercfg.c.
*/
void ser_setup_config_box(struct controlbox *b, int midsession,
int parity_mask, int flow_mask);
/*
* Exports from version.c.
*/
extern char ver[];
/*
* Exports from unicode.c.
*/
#ifndef CP_UTF8
#define CP_UTF8 65001
#endif
/* void init_ucs(void); -- this is now in platform-specific headers */
int is_dbcs_leadbyte(int codepage, char byte);
int mb_to_wc(int codepage, int flags, const char *mbstr, int mblen,
wchar_t *wcstr, int wclen);
int wc_to_mb(int codepage, int flags, const wchar_t *wcstr, int wclen,
char *mbstr, int mblen, char *defchr, int *defused,
struct unicode_data *ucsdata);
wchar_t xlat_uskbd2cyrllic(int ch);
int check_compose(int first, int second);
int decode_codepage(char *cp_name);
const char *cp_enumerate (int index);
const char *cp_name(int codepage);
void get_unitab(int codepage, wchar_t * unitab, int ftype);
/*
* Exports from wcwidth.c
*/
int mk_wcwidth(unsigned int ucs);
int mk_wcswidth(const unsigned int *pwcs, size_t n);
int mk_wcwidth_cjk(unsigned int ucs);
int mk_wcswidth_cjk(const unsigned int *pwcs, size_t n);
/*
* Exports from mscrypto.c
*/
#ifdef MSCRYPTOAPI
int crypto_startup();
void crypto_wrapup();
#endif
/*
* Exports from pageantc.c.
*
* agent_query returns 1 for here's-a-response, and 0 for query-in-
* progress. In the latter case there will be a call to `callback'
* at some future point, passing callback_ctx as the first
* parameter and the actual reply data as the second and third.
*
* The response may be a NULL pointer (in either of the synchronous
* or asynchronous cases), which indicates failure to receive a
* response.
*/
int agent_query(void *in, int inlen, void **out, int *outlen,
void (*callback)(void *, void *, int), void *callback_ctx);
int agent_exists(void);
/*
* Exports from wildcard.c
*/
const char *wc_error(int value);
int wc_match(const char *wildcard, const char *target);
int wc_unescape(char *output, const char *wildcard);
/*
* Exports from frontend (windlg.c etc)
*/
void logevent(void *frontend, const char *);
void pgp_fingerprints(void);
/*
* verify_ssh_host_key() can return one of three values:
*
* - +1 means `key was OK' (either already known or the user just
* approved it) `so continue with the connection'
*
* - 0 means `key was not OK, abandon the connection'
*
* - -1 means `I've initiated enquiries, please wait to be called
* back via the provided function with a result that's either 0
* or +1'.
*/
int verify_ssh_host_key(void *frontend, char *host, int port, char *keytype,
char *keystr, char *fingerprint,
void (*callback)(void *ctx, int result), void *ctx);
/*
* askalg has the same set of return values as verify_ssh_host_key.
*/
int askalg(void *frontend, const char *algtype, const char *algname,
void (*callback)(void *ctx, int result), void *ctx);
/*
* askappend can return four values:
*
* - 2 means overwrite the log file
* - 1 means append to the log file
* - 0 means cancel logging for this session
* - -1 means please wait.
*/
int askappend(void *frontend, Filename *filename,
void (*callback)(void *ctx, int result), void *ctx);
/*
* Exports from console frontends (wincons.c, uxcons.c)
* that aren't equivalents to things in windlg.c et al.
*/
extern int console_batch_mode;
int console_get_userpass_input(prompts_t *p, unsigned char *in, int inlen);
void console_provide_logctx(void *logctx);
int is_interactive(void);
/*
* Exports from printing.c.
*/
typedef struct printer_enum_tag printer_enum;
typedef struct printer_job_tag printer_job;
printer_enum *printer_start_enum(int *nprinters);
char *printer_get_name(printer_enum *, int);
void printer_finish_enum(printer_enum *);
printer_job *printer_start_job(char *printer);
void printer_job_data(printer_job *, void *, int);
void printer_finish_job(printer_job *);
/*
* Exports from cmdline.c (and also cmdline_error(), which is
* defined differently in various places and required _by_
* cmdline.c).
*/
int cmdline_process_param(char *, char *, int, Conf *);
void cmdline_run_saved(Conf *);
void cmdline_cleanup(void);
int cmdline_get_passwd_input(prompts_t *p, unsigned char *in, int inlen);
#define TOOLTYPE_FILETRANSFER 1
#define TOOLTYPE_NONNETWORK 2
extern int cmdline_tooltype;
void cmdline_error(char *, ...);
/*
* Exports from config.c.
*/
struct controlbox;
union control;
void conf_radiobutton_handler(union control *ctrl, void *dlg,
void *data, int event);
#define CHECKBOX_INVERT (1<<30)
void conf_checkbox_handler(union control *ctrl, void *dlg,
void *data, int event);
void conf_editbox_handler(union control *ctrl, void *dlg,
void *data, int event);
void conf_filesel_handler(union control *ctrl, void *dlg,
void *data, int event);
void conf_fontsel_handler(union control *ctrl, void *dlg,
void *data, int event);
void setup_config_box(struct controlbox *b, int midsession,
int protocol, int protcfginfo);
/*
* Exports from minibidi.c.
*/
typedef struct bidi_char {
unsigned int origwc, wc;
unsigned short index;
} bidi_char;
int do_bidi(bidi_char *line, int count);
int do_shape(bidi_char *line, bidi_char *to, int count);
int is_rtl(int c);
/*
* X11 auth mechanisms we know about.
*/
enum {
X11_NO_AUTH,
X11_MIT, /* MIT-MAGIC-COOKIE-1 */
X11_XDM, /* XDM-AUTHORIZATION-1 */
X11_NAUTHS
};
extern const char *const x11_authnames[]; /* declared in x11fwd.c */
/*
* Miscellaneous exports from the platform-specific code.
*
* filename_serialise and filename_deserialise have the same semantics
* as fontspec_serialise and fontspec_deserialise above.
*/
Filename *filename_from_str(const char *string);
const char *filename_to_str(const Filename *fn);
int filename_equal(const Filename *f1, const Filename *f2);
int filename_is_null(const Filename *fn);
Filename *filename_copy(const Filename *fn);
void filename_free(Filename *fn);
int filename_serialise(const Filename *f, void *data);
Filename *filename_deserialise(void *data, int maxsize, int *used);
char *get_username(void); /* return value needs freeing */
char *get_random_data(int bytes); /* used in cmdgen.c */
/*
* Exports and imports from timing.c.
*
* schedule_timer() asks the front end to schedule a callback to a
* timer function in a given number of ticks. The returned value is
* the time (in ticks since an arbitrary offset) at which the
* callback can be expected. This value will also be passed as the
* `now' parameter to the callback function. Hence, you can (for
* example) schedule an event at a particular time by calling
* schedule_timer() and storing the return value in your context
* structure as the time when that event is due. The first time a
* callback function gives you that value or more as `now', you do
* the thing.
*
* expire_timer_context() drops all current timers associated with
* a given value of ctx (for when you're about to free ctx).
*
* run_timers() is called from the front end when it has reason to
* think some timers have reached their moment, or when it simply
* needs to know how long to wait next. We pass it the time we
* think it is. It returns TRUE and places the time when the next
* timer needs to go off in `next', or alternatively it returns
* FALSE if there are no timers at all pending.
*
* timer_change_notify() must be supplied by the front end; it
* notifies the front end that a new timer has been added to the
* list which is sooner than any existing ones. It provides the
* time when that timer needs to go off.
*
* *** FRONT END IMPLEMENTORS NOTE:
*
* There's an important subtlety in the front-end implementation of
* the timer interface. When a front end is given a `next' value,
* either returned from run_timers() or via timer_change_notify(),
* it should ensure that it really passes _that value_ as the `now'
* parameter to its next run_timers call. It should _not_ simply
* call GETTICKCOUNT() to get the `now' parameter when invoking
* run_timers().
*
* The reason for this is that an OS's system clock might not agree
* exactly with the timing mechanisms it supplies to wait for a
* given interval. I'll illustrate this by the simple example of
* Unix Plink, which uses timeouts to select() in a way which for
* these purposes can simply be considered to be a wait() function.
* Suppose, for the sake of argument, that this wait() function
* tends to return early by 1%. Then a possible sequence of actions
* is:
*
* - run_timers() tells the front end that the next timer firing
* is 10000ms from now.
* - Front end calls wait(10000ms), but according to
* GETTICKCOUNT() it has only waited for 9900ms.
* - Front end calls run_timers() again, passing time T-100ms as
* `now'.
* - run_timers() does nothing, and says the next timer firing is
* still 100ms from now.
* - Front end calls wait(100ms), which only waits for 99ms.
* - Front end calls run_timers() yet again, passing time T-1ms.
* - run_timers() says there's still 1ms to wait.
* - Front end calls wait(1ms).
*
* If you're _lucky_ at this point, wait(1ms) will actually wait
* for 1ms and you'll only have woken the program up three times.
* If you're unlucky, wait(1ms) might do nothing at all due to
* being below some minimum threshold, and you might find your
* program spends the whole of the last millisecond tight-looping
* between wait() and run_timers().
*
* Instead, what you should do is to _save_ the precise `next'
* value provided by run_timers() or via timer_change_notify(), and
* use that precise value as the input to the next run_timers()
* call. So:
*
* - run_timers() tells the front end that the next timer firing
* is at time T, 10000ms from now.
* - Front end calls wait(10000ms).
* - Front end then immediately calls run_timers() and passes it
* time T, without stopping to check GETTICKCOUNT() at all.
*
* This guarantees that the program wakes up only as many times as
* there are actual timer actions to be taken, and that the timing
* mechanism will never send it into a tight loop.
*
* (It does also mean that the timer action in the above example
* will occur 100ms early, but this is not generally critical. And
* the hypothetical 1% error in wait() will be partially corrected
* for anyway when, _after_ run_timers() returns, you call
* GETTICKCOUNT() and compare the result with the returned `next'
* value to find out how long you have to make your next wait().)
*/
typedef void (*timer_fn_t)(void *ctx, unsigned long now);
unsigned long schedule_timer(int ticks, timer_fn_t fn, void *ctx);
void expire_timer_context(void *ctx);
int run_timers(unsigned long now, unsigned long *next);
void timer_change_notify(unsigned long next);
/*
* Define no-op macros for the jump list functions, on platforms that
* don't support them. (This is a bit of a hack, and it'd be nicer to
* localise even the calls to those functions into the Windows front
* end, but it'll do for the moment.)
*/
#ifndef JUMPLIST_SUPPORTED
#define add_session_to_jumplist(x) ((void)0)
#define remove_session_from_jumplist(x) ((void)0)
#endif
/* SURROGATE PAIR */
#ifndef IS_HIGH_SURROGATE
#define HIGH_SURROGATE_START 0xd800
#define HIGH_SURROGATE_END 0xdbff
#define LOW_SURROGATE_START 0xdc00
#define LOW_SURROGATE_END 0xdfff
#define IS_HIGH_SURROGATE(wch) (((wch) >= HIGH_SURROGATE_START) && \
((wch) <= HIGH_SURROGATE_END))
#define IS_LOW_SURROGATE(wch) (((wch) >= LOW_SURROGATE_START) && \
((wch) <= LOW_SURROGATE_END))
#define IS_SURROGATE_PAIR(hs, ls) (IS_HIGH_SURROGATE(hs) && \
IS_LOW_SURROGATE(ls))
#endif
#define IS_SURROGATE(wch) (((wch) >= HIGH_SURROGATE_START) && \
((wch) <= LOW_SURROGATE_END))
#define HIGH_SURROGATE_OF(codept) \
(HIGH_SURROGATE_START + (((codept) - 0x10000) >> 10))
#define LOW_SURROGATE_OF(codept) \
(LOW_SURROGATE_START + (((codept) - 0x10000) & 0x3FF))
#define FROM_SURROGATES(wch1, wch2) \
(0x10000 + (((wch1) & 0x3FF) << 10) + ((wch2) & 0x3FF))
#endif
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