#ifndef PUTTY_PUTTY_H #define PUTTY_PUTTY_H #include /* for wchar_t */ #include /* for INT_MAX */ /* * 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 #include "defs.h" #include "puttyps.h" #include "network.h" #include "misc.h" #include "marshal.h" /* * We express various time intervals in unsigned long minutes, but may need to * clip some values so that the resulting number of ticks does not overflow an * integer value. */ #define MAX_TICK_MINS (INT_MAX / (60 * TICKSPERSEC)) /* * Fingerprints of the current and previous PGP master keys, to * establish a trust path between an executable and other files. */ #define PGP_MASTER_KEY_YEAR "2018" #define PGP_MASTER_KEY_DETAILS "RSA, 4096-bit" #define PGP_MASTER_KEY_FP \ "24E1 B1C5 75EA 3C9F F752 A922 76BC 7FE4 EBFD 2D9E" #define PGP_PREV_MASTER_KEY_YEAR "2015" #define PGP_PREV_MASTER_KEY_DETAILS "RSA, 4096-bit" #define PGP_PREV_MASTER_KEY_FP \ "440D E3B5 B7A1 CA85 B3CC 1718 AB58 5DC6 0467 6F7C" /* 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 0x0800000U #define ATTR_WIDE 0x0400000U #define ATTR_BOLD 0x0040000U #define ATTR_UNDER 0x0080000U #define ATTR_REVERSE 0x0100000U #define ATTR_BLINK 0x0200000U #define ATTR_FGMASK 0x00001FFU #define ATTR_BGMASK 0x003FE00U #define ATTR_COLOURS 0x003FFFFU #define ATTR_DIM 0x1000000U #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; const 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 */ /* * Enumeration of 'special commands' that can be sent during a * session, separately from the byte stream of ordinary session data. */ typedef enum { /* * Commands that are generally useful in multiple backends. */ SS_BRK, /* serial-line break */ SS_EOF, /* end-of-file on session input */ SS_NOP, /* transmit data with no effect */ SS_PING, /* try to keep the session alive (probably, but not * necessarily, implemented as SS_NOP) */ /* * Commands specific to Telnet. */ SS_AYT, /* Are You There */ SS_SYNCH, /* Synch */ SS_EC, /* Erase Character */ SS_EL, /* Erase Line */ SS_GA, /* Go Ahead */ SS_ABORT, /* Abort Process */ SS_AO, /* Abort Output */ SS_IP, /* Interrupt Process */ SS_SUSP, /* Suspend Process */ SS_EOR, /* End Of Record */ SS_EOL, /* Telnet end-of-line sequence (CRLF, as opposed to CR * NUL that escapes a literal CR) */ /* * Commands specific to SSH. */ SS_REKEY, /* trigger an immediate repeat key exchange */ SS_XCERT, /* cross-certify another host key ('arg' indicates which) */ /* * Send a POSIX-style signal. (Useful in SSH and also pterm.) */ SS_SIGABRT, SS_SIGALRM, SS_SIGFPE, SS_SIGHUP, SS_SIGILL, SS_SIGINT, SS_SIGKILL, SS_SIGPIPE, SS_SIGQUIT, SS_SIGSEGV, SS_SIGTERM, SS_SIGUSR1, SS_SIGUSR2, /* * These aren't really special commands, but they appear in the * enumeration because the list returned from * backend_get_specials() will use them to specify the structure * of the GUI specials menu. */ SS_SEP, /* Separator */ SS_SUBMENU, /* Start a new submenu with specified name */ SS_EXITMENU, /* Exit current submenu, or end of entire specials list */ } SessionSpecialCode; /* * The structure type returned from backend_get_specials. */ struct SessionSpecial { const char *name; SessionSpecialCode code; int arg; }; 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_ECDH, KEX_MAX }; enum { /* * SSH-2 host key algorithms */ HK_WARN, HK_RSA, HK_DSA, HK_ECDSA, HK_ED25519, HK_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_CHACHA20, 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, proxy terminal logging, 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, PROXY_FUZZ }; 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. */ const 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 { const BackendVtable *vt; }; struct BackendVtable { const char *(*init) (Seat *seat, Backend **backend_out, LogContext *logctx, Conf *conf, const char *host, int port, char **realhost, int nodelay, int keepalive); void (*free) (Backend *be); /* Pass in a replacement configuration. */ void (*reconfig) (Backend *be, Conf *conf); /* send() returns the current amount of buffered data. */ int (*send) (Backend *be, const char *buf, int len); /* sendbuffer() does the same thing but without attempting a send */ int (*sendbuffer) (Backend *be); void (*size) (Backend *be, int width, int height); void (*special) (Backend *be, SessionSpecialCode code, int arg); const SessionSpecial *(*get_specials) (Backend *be); int (*connected) (Backend *be); int (*exitcode) (Backend *be); /* If back->sendok() returns FALSE, the backend doesn't currently * want input data, so the frontend should avoid acquiring any if * possible (passing back-pressure on to its sender). */ int (*sendok) (Backend *be); int (*ldisc_option_state) (Backend *be, int); void (*provide_ldisc) (Backend *be, Ldisc *ldisc); /* Tells the back end that the front end buffer is clearing. */ void (*unthrottle) (Backend *be, int bufsize); int (*cfg_info) (Backend *be); /* Only implemented in the SSH protocol: check whether a * connection-sharing upstream exists for a given configuration. */ int (*test_for_upstream)(const char *host, int port, Conf *conf); const char *name; int protocol; int default_port; }; #define backend_init(vt, seat, out, logctx, conf, host, port, rhost, nd, ka) \ ((vt)->init(seat, out, logctx, conf, host, port, rhost, nd, ka)) #define backend_free(be) ((be)->vt->free(be)) #define backend_reconfig(be, conf) ((be)->vt->reconfig(be, conf)) #define backend_send(be, buf, len) ((be)->vt->send(be, buf, len)) #define backend_sendbuffer(be) ((be)->vt->sendbuffer(be)) #define backend_size(be, w, h) ((be)->vt->size(be, w, h)) #define backend_special(be, code, arg) ((be)->vt->special(be, code, arg)) #define backend_get_specials(be) ((be)->vt->get_specials(be)) #define backend_connected(be) ((be)->vt->connected(be)) #define backend_exitcode(be) ((be)->vt->exitcode(be)) #define backend_sendok(be) ((be)->vt->sendok(be)) #define backend_ldisc_option_state(be, opt) \ ((be)->vt->ldisc_option_state(be, opt)) #define backend_provide_ldisc(be, ldisc) ((be)->vt->provide_ldisc(be, ldisc)) #define backend_unthrottle(be, bufsize) ((be)->vt->unthrottle(be, bufsize)) #define backend_cfg_info(be) ((be)->vt->cfg_info(be)) extern const struct BackendVtable *const 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_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_INTERACTIVE 0x0002 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; /* * 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 *data; /* slot for housekeeping data, managed by * seat_get_userpass_input(); initially NULL */ } prompts_t; prompts_t *new_prompts(); 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); /* * Data type definitions for true-colour terminal display. * 'optionalrgb' describes a single RGB colour, which overrides the * other colour settings if 'enabled' is nonzero, and is ignored * otherwise. 'truecolour' contains a pair of those for foreground and * background. */ typedef struct optionalrgb { unsigned char enabled; unsigned char r, g, b; } optionalrgb; extern const optionalrgb optionalrgb_none; typedef struct truecolour { optionalrgb fg, bg; } truecolour; #define optionalrgb_equal(r1,r2) ( \ (r1).enabled==(r2).enabled && \ (r1).r==(r2).r && (r1).g==(r2).g && (r1).b==(r2).b) #define truecolour_equal(c1,c2) ( \ optionalrgb_equal((c1).fg, (c2).fg) && \ optionalrgb_equal((c1).bg, (c2).bg)) /* * Enumeration of clipboards. We provide some standard ones cross- * platform, and then permit each platform to extend this enumeration * further by defining PLATFORM_CLIPBOARDS in its own header file. * * CLIP_NULL is a non-clipboard, writes to which are ignored and reads * from which return no data. * * CLIP_LOCAL refers to a buffer within terminal.c, which * unconditionally saves the last data selected in the terminal. In * configurations where a system clipboard is not written * automatically on selection but instead by an explicit UI action, * this is where the code responding to that action can find the data * to write to the clipboard in question. */ #define CROSS_PLATFORM_CLIPBOARDS(X) \ X(CLIP_NULL, "null clipboard") \ X(CLIP_LOCAL, "last text selected in terminal") \ /* end of list */ #define ALL_CLIPBOARDS(X) \ CROSS_PLATFORM_CLIPBOARDS(X) \ PLATFORM_CLIPBOARDS(X) \ /* end of list */ #define CLIP_ID(id,name) id, enum { ALL_CLIPBOARDS(CLIP_ID) N_CLIPBOARDS }; #undef CLIP_ID /* Hint from backend to frontend about time-consuming operations, used * by seat_set_busy_status. Initial state is assumed to be * BUSY_NOT. */ typedef enum BusyStatus { 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 */ } BusyStatus; /* * Data type 'Seat', which is an API intended to contain essentially * everything that a back end might need to talk to its client for: * session output, password prompts, SSH warnings about host keys and * weak cryptography, notifications of events like the remote process * exiting or the GUI specials menu needing an update. */ struct Seat { const struct SeatVtable *vt; }; struct SeatVtable { /* * Provide output from the remote session. 'is_stderr' indicates * that the output should be sent to a separate error message * channel, if the seat has one. But combining both channels into * one is OK too; that's what terminal-window based seats do. * * The return value is the current size of the output backlog. */ int (*output)(Seat *seat, int is_stderr, const void *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 (*eof)(Seat *seat); /* * Try to get answers from a set of interactive login prompts. The * prompts are provided in 'p'; the bufchain 'input' holds the * data currently outstanding in the session's normal standard- * input channel. Seats may implement this function by consuming * data from 'input' (e.g. password prompts in GUI PuTTY, * displayed in the same terminal as the subsequent session), or * by doing something entirely different (e.g. directly * interacting with standard I/O, or putting up a dialog box). * * A positive return value means that all prompts have had answers * filled in. A zero return means that the user performed a * deliberate 'cancel' UI action. A negative return means that no * answer can be given yet but please try again later. * * (FIXME: it would be nice to distinguish two classes of cancel * action, so the user could specify 'I want to abandon this * entire attempt to start a session' or the milder 'I want to * abandon this particular form of authentication and fall back to * a different one' - e.g. if you turn out not to be able to * remember your private key passphrase then perhaps you'd rather * fall back to password auth rather than aborting the whole * session.) * * (Also FIXME: currently, backends' only response to the 'try * again later' is to try again when more input data becomes * available, because they assume that a seat is returning that * value because it's consuming keyboard input. But a seat that * handled this function by putting up a dialog box might want to * put it up non-modally, and therefore would want to proactively * notify the backend to retry once the dialog went away. So if I * ever do want to move password prompts into a dialog box, I'll * want a backend method for sending that notification.) */ int (*get_userpass_input)(Seat *seat, prompts_t *p, bufchain *input); /* * Notify the seat that the process running at the other end of * the connection has finished. */ void (*notify_remote_exit)(Seat *seat); /* * Notify the seat that the connection has suffered a fatal error. */ void (*connection_fatal)(Seat *seat, const char *message); /* * Notify the seat that the list of special commands available * from backend_get_specials() has changed, so that it might want * to call that function to repopulate its menu. * * Seats are not expected to call backend_get_specials() * proactively; they may start by assuming that the backend * provides no special commands at all, so if the backend does * provide any, then it should use this notification at startup * time. Of course 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)(Seat *seat); /* * Get the seat's preferred value for an SSH terminal mode * setting. Returning NULL indicates no preference (i.e. the SSH * connection will not attempt to set the mode at all). * * The returned value is dynamically allocated, and the caller * should free it. */ char *(*get_ttymode)(Seat *seat, const char *mode); /* * Tell the seat whether the backend is currently doing anything * CPU-intensive (typically a cryptographic key exchange). See * BusyStatus enumeration above. */ void (*set_busy_status)(Seat *seat, BusyStatus status); /* * Ask the seat whether a given SSH host key should be accepted. * This may return immediately after checking saved configuration * or command-line options, or it may have to present a prompt to * the user and return asynchronously later. * * Return 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)( Seat *seat, const char *host, int port, const char *keytype, char *keystr, char *key_fingerprint, void (*callback)(void *ctx, int result), void *ctx); /* * Check with the seat whether it's OK to use a cryptographic * primitive from below the 'warn below this line' threshold in * the input Conf. Return values are the same as * verify_ssh_host_key above. */ int (*confirm_weak_crypto_primitive)( Seat *seat, const char *algtype, const char *algname, void (*callback)(void *ctx, int result), void *ctx); /* * Variant form of confirm_weak_crypto_primitive, which prints a * slightly different message but otherwise has the same * semantics. * * This form is used in the case where we're using a host key * below the warning threshold because that's the best one we have * cached, but at least one host key algorithm *above* the * threshold is available that we don't have cached. 'betteralgs' * lists the better algorithm(s). */ int (*confirm_weak_cached_hostkey)( Seat *seat, const char *algname, const char *betteralgs, void (*callback)(void *ctx, int result), void *ctx); /* * Indicates whether the seat is expecting to interact with the * user in the UTF-8 character set. (Affects e.g. visual erase * handling in local line editing.) */ int (*is_utf8)(Seat *seat); /* * Notify the seat that the back end, and/or the ldisc between * them, have changed their idea of whether they currently want * local echo and/or local line editing enabled. */ void (*echoedit_update)(Seat *seat, int echoing, int editing); /* * Return the local X display string relevant to a seat, or NULL * if there isn't one or if the concept is meaningless. */ const char *(*get_x_display)(Seat *seat); /* * Return the X11 id of the X terminal window relevant to a seat, * by returning TRUE and filling in the output pointer. Return * FALSE if there isn't one or if the concept is meaningless. */ int (*get_windowid)(Seat *seat, long *id_out); /* * Return the pixel size of a terminal character cell. If the * concept is meaningless or the information is unavailable, * return FALSE; otherwise fill in the output pointers and return * TRUE. */ int (*get_char_cell_size)(Seat *seat, int *width, int *height); }; #define seat_output(seat, is_stderr, data, len) \ ((seat)->vt->output(seat, is_stderr, data, len)) #define seat_eof(seat) \ ((seat)->vt->eof(seat)) #define seat_get_userpass_input(seat, p, input) \ ((seat)->vt->get_userpass_input(seat, p, input)) #define seat_notify_remote_exit(seat) \ ((seat)->vt->notify_remote_exit(seat)) #define seat_update_specials_menu(seat) \ ((seat)->vt->update_specials_menu(seat)) #define seat_get_ttymode(seat, mode) \ ((seat)->vt->get_ttymode(seat, mode)) #define seat_set_busy_status(seat, status) \ ((seat)->vt->set_busy_status(seat, status)) #define seat_verify_ssh_host_key(seat, h, p, typ, str, fp, cb, ctx) \ ((seat)->vt->verify_ssh_host_key(seat, h, p, typ, str, fp, cb, ctx)) #define seat_confirm_weak_crypto_primitive(seat, typ, alg, cb, ctx) \ ((seat)->vt->confirm_weak_crypto_primitive(seat, typ, alg, cb, ctx)) #define seat_confirm_weak_cached_hostkey(seat, alg, better, cb, ctx) \ ((seat)->vt->confirm_weak_cached_hostkey(seat, alg, better, cb, ctx)) #define seat_is_utf8(seat) \ ((seat)->vt->is_utf8(seat)) #define seat_echoedit_update(seat, echoing, editing) \ ((seat)->vt->echoedit_update(seat, echoing, editing)) #define seat_get_x_display(seat) \ ((seat)->vt->get_x_display(seat)) #define seat_get_windowid(seat, out) \ ((seat)->vt->get_windowid(seat, out)) #define seat_get_char_cell_size(seat, width, height) \ ((seat)->vt->get_char_cell_size(seat, width, height)) /* Unlike the seat's actual method, the public entry point * seat_connection_fatal is a wrapper function with a printf-like API, * defined in misc.c. */ void seat_connection_fatal(Seat *seat, const char *fmt, ...); /* Handy aliases for seat_output which set is_stderr to a fixed value. */ #define seat_stdout(seat, data, len) \ seat_output(seat, FALSE, data, len) #define seat_stderr(seat, data, len) \ seat_output(seat, TRUE, data, len) /* * Stub methods for seat implementations that want to use the obvious * null handling for a given method. * * These are generally obvious, except for is_utf8, where you might * plausibly want to return either fixed answer 'no' or 'yes'. */ int nullseat_output(Seat *seat, int is_stderr, const void *data, int len); int nullseat_eof(Seat *seat); int nullseat_get_userpass_input(Seat *seat, prompts_t *p, bufchain *input); void nullseat_notify_remote_exit(Seat *seat); void nullseat_connection_fatal(Seat *seat, const char *message); void nullseat_update_specials_menu(Seat *seat); char *nullseat_get_ttymode(Seat *seat, const char *mode); void nullseat_set_busy_status(Seat *seat, BusyStatus status); int nullseat_verify_ssh_host_key( Seat *seat, const char *host, int port, const char *keytype, char *keystr, char *key_fingerprint, void (*callback)(void *ctx, int result), void *ctx); int nullseat_confirm_weak_crypto_primitive( Seat *seat, const char *algtype, const char *algname, void (*callback)(void *ctx, int result), void *ctx); int nullseat_confirm_weak_cached_hostkey( Seat *seat, const char *algname, const char *betteralgs, void (*callback)(void *ctx, int result), void *ctx); int nullseat_is_never_utf8(Seat *seat); int nullseat_is_always_utf8(Seat *seat); void nullseat_echoedit_update(Seat *seat, int echoing, int editing); const char *nullseat_get_x_display(Seat *seat); int nullseat_get_windowid(Seat *seat, long *id_out); int nullseat_get_char_cell_size(Seat *seat, int *width, int *height); /* * Seat functions provided by the platform's console-application * support module (wincons.c, uxcons.c). */ void console_connection_fatal(Seat *seat, const char *message); int console_verify_ssh_host_key( Seat *seat, const char *host, int port, const char *keytype, char *keystr, char *key_fingerprint, void (*callback)(void *ctx, int result), void *ctx); int console_confirm_weak_crypto_primitive( Seat *seat, const char *algtype, const char *algname, void (*callback)(void *ctx, int result), void *ctx); int console_confirm_weak_cached_hostkey( Seat *seat, const char *algname, const char *betteralgs, void (*callback)(void *ctx, int result), void *ctx); /* * Other centralised seat functions. */ int filexfer_get_userpass_input(Seat *seat, prompts_t *p, bufchain *input); /* * Exports from the front end. */ void request_resize(Frontend *frontend, int, int); void do_text(Context, int, int, wchar_t *, int, unsigned long, int, truecolour); void do_cursor(Context, int, int, wchar_t *, int, unsigned long, int, truecolour); int char_width(Context ctx, int uc); #ifdef OPTIMISE_SCROLL void do_scroll(Context, int, int, int); #endif void set_title(Frontend *frontend, char *); void set_icon(Frontend *frontend, char *); void set_sbar(Frontend *frontend, int, int, int); Context get_ctx(Frontend *frontend); void free_ctx(Context); void palette_set(Frontend *frontend, int, int, int, int); void palette_reset(Frontend *frontend); int palette_get(Frontend *frontend, int n, int *r, int *g, int *b); void write_clip(Frontend *frontend, int clipboard, wchar_t *, int *, truecolour *, int, int); void optimised_move(Frontend *frontend, int, int, int); void set_raw_mouse_mode(Frontend *frontend, int); void nonfatal(const char *, ...); void modalfatalbox(const char *, ...); #ifdef macintosh #pragma noreturn(modalfatalbox) #endif void do_beep(Frontend *frontend, int); void sys_cursor(Frontend *frontend, int x, int y); void frontend_request_paste(Frontend *frontend, int clipboard); #define OPTIMISE_IS_SCROLL 1 void set_iconic(Frontend *frontend, int iconic); void move_window(Frontend *frontend, int x, int y); void set_zorder(Frontend *frontend, int top); void refresh_window(Frontend *frontend); void set_zoomed(Frontend *frontend, int zoomed); int is_iconic(Frontend *frontend); void get_window_pos(Frontend *frontend, int *x, int *y); void get_window_pixels(Frontend *frontend, int *x, int *y); char *get_window_title(Frontend *frontend, int icon); int frontend_is_utf8(Frontend *frontend); 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) \ X(INT, NONE, proxy_log_to_term) \ /* 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, INT, ssh_hklist) \ 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) \ /* \ * Which SSH protocol to use. \ * For historical reasons, the current legal values for CONF_sshprot \ * are: \ * 0 = SSH-1 only \ * 3 = SSH-2 only \ * We used to also support \ * 1 = SSH-1 with fallback to SSH-2 \ * 2 = SSH-2 with fallback to SSH-1 \ * and we continue to use 0/3 in storage formats rather than the more \ * obvious 1/2 to avoid surprises if someone saves a session and later \ * downgrades PuTTY. So it's easier to use these numbers internally too. \ */ \ X(INT, NONE, sshprot) \ 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 via ssh userauth */ \ X(INT, NONE, try_gssapi_kex) /* attempt gssapi auth via ssh kex */ \ X(INT, NONE, gssapifwd) /* forward tgt via gss */ \ X(INT, NONE, gssapirekey) /* KEXGSS refresh interval (mins) */ \ 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_remote_clearscroll) /* disable ESC[3J */ \ 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(INT, NONE, osx_option_meta) \ X(INT, NONE, osx_command_meta) \ 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, logheader) \ 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, true_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, paste_controls) \ X(INT, NONE, rawcnp) \ X(INT, NONE, utf8linedraw) \ X(INT, NONE, rtf_paste) \ X(INT, NONE, mouse_override) \ X(INT, INT, wordness) \ X(INT, NONE, mouseautocopy) \ X(INT, NONE, mousepaste) \ X(INT, NONE, ctrlshiftins) \ X(INT, NONE, ctrlshiftcv) \ X(STR, NONE, mousepaste_custom) \ X(STR, NONE, ctrlshiftins_custom) \ X(STR, NONE, ctrlshiftcv_custom) \ /* 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_oldgex2) \ X(INT, NONE, sshbug_winadj) \ X(INT, NONE, sshbug_chanreq) \ /* \ * 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) \ X(INT, NONE, ssh_connection_sharing) \ X(INT, NONE, ssh_connection_sharing_upstream) \ X(INT, NONE, ssh_connection_sharing_downstream) \ /* * ssh_manual_hostkeys is conceptually a set rather than a * dictionary: the string subkeys are the important thing, and the * actual values to which those subkeys map are all "". */ \ X(STR, STR, ssh_manual_hostkeys) \ /* 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 */ void conf_serialise(BinarySink *bs, Conf *conf); int conf_deserialise(Conf *conf, BinarySource *src);/*returns true on success*/ /* * 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); void fontspec_serialise(BinarySink *bs, FontSpec *f); FontSpec *fontspec_deserialise(BinarySource *src); /* * 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. */ const struct BackendVtable *backend_vt_from_name(const char *name); const struct BackendVtable *backend_vt_from_proto(int proto); char *get_remote_username(Conf *conf); /* dynamically allocated */ char *save_settings(const char *section, Conf *conf); void save_open_settings(settings_w *sesskey, Conf *conf); void load_settings(const char *section, Conf *conf); void load_open_settings(settings_r *sesskey, Conf *conf); void get_sesslist(struct sesslist *, int allocate); void do_defaults(const 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 *, Frontend *); 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_lost_clipboard_ownership(Terminal *, int clipboard); void term_update(Terminal *); void term_invalidate(Terminal *); void term_blink(Terminal *, int set_cursor); void term_do_paste(Terminal *, const wchar_t *, int); void term_nopaste(Terminal *); int term_ldisc(Terminal *, int option); void term_copyall(Terminal *, const int *, int); void term_reconfig(Terminal *, Conf *); void term_request_copy(Terminal *, const int *clipboards, int n_clipboards); void term_request_paste(Terminal *, int clipboard); void term_seen_key_event(Terminal *); int term_data(Terminal *, int is_stderr, const void *data, int len); void term_provide_backend(Terminal *term, Backend *backend); void term_provide_logctx(Terminal *term, LogContext *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, bufchain *input); int format_arrow_key(char *buf, Terminal *term, int xkey, int ctrl); /* * Exports from logging.c. */ struct LogPolicyVtable { /* * Pass Event Log entries on from LogContext to the front end, * which might write them to standard error or save them for a GUI * list box or other things. */ void (*eventlog)(LogPolicy *lp, const char *event); /* * Ask what to do about the specified output log file already * existing. 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, and callback() will be called with one * of those options. */ int (*askappend)(LogPolicy *lp, Filename *filename, void (*callback)(void *ctx, int result), void *ctx); /* * Emergency logging when the log file itself can't be opened, * which typically means we want to shout about it more loudly * than a mere Event Log entry. * * One reasonable option is to send it to the same place that * stderr output from the main session goes (so, either a console * tool's actual stderr, or a terminal window). In many cases this * is unlikely to cause this error message to turn up * embarrassingly in a log file of real server output, because the * whole point is that we haven't managed to open any such log * file :-) */ void (*logging_error)(LogPolicy *lp, const char *event); }; struct LogPolicy { const LogPolicyVtable *vt; }; #define lp_eventlog(lp, event) ((lp)->vt->eventlog(lp, event)) #define lp_askappend(lp, fn, cb, ctx) ((lp)->vt->askappend(lp, fn, cb, ctx)) #define lp_logging_error(lp, event) ((lp)->vt->logging_error(lp, event)) LogContext *log_init(LogPolicy *lp, Conf *conf); void log_free(LogContext *logctx); void log_reconfig(LogContext *logctx, Conf *conf); void logfopen(LogContext *logctx); void logfclose(LogContext *logctx); void logtraffic(LogContext *logctx, unsigned char c, int logmode); void logflush(LogContext *logctx); void logevent(LogContext *logctx, const char *event); void logeventf(LogContext *logctx, const char *fmt, ...); void logeventvf(LogContext *logctx, const char *fmt, va_list ap); /* * Pass a dynamically allocated string to logevent and immediately * free it. Intended for use by wrapper macros which pass the return * value of dupprintf straight to this. */ void logevent_and_free(LogContext *logctx, char *event); enum { PKT_INCOMING, PKT_OUTGOING }; enum { PKTLOG_EMIT, PKTLOG_BLANK, PKTLOG_OMIT }; struct logblank_t { int offset; int len; int type; }; void log_packet(LogContext *logctx, int direction, int type, const char *texttype, const void *data, int len, int n_blanks, const struct logblank_t *blanks, const unsigned long *sequence, unsigned downstream_id, const char *additional_log_text); /* This is defined by applications that have an obvious logging * destination like standard error or the GUI. */ extern LogPolicy default_logpolicy[1]; /* * Exports from testback.c */ extern const struct BackendVtable null_backend; extern const struct BackendVtable loop_backend; /* * Exports from raw.c. */ extern const struct BackendVtable raw_backend; /* * Exports from rlogin.c. */ extern const struct BackendVtable rlogin_backend; /* * Exports from telnet.c. */ extern const struct BackendVtable telnet_backend; /* * Exports from ssh.c. */ extern const struct BackendVtable ssh_backend; /* * Exports from ldisc.c. */ Ldisc *ldisc_create(Conf *, Terminal *, Backend *, Seat *); void ldisc_configure(Ldisc *, Conf *); void ldisc_free(Ldisc *); void ldisc_send(Ldisc *, const void *buf, int len, int interactive); void ldisc_echoedit_update(Ldisc *); /* * Exports from ldiscucs.c. */ void lpage_send(Ldisc *, int codepage, const char *buf, int len, int interactive); void luni_send(Ldisc *, const 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 Pinger; Pinger *pinger_new(Conf *conf, Backend *backend); 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 sessprep.c. */ void prepare_session(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 const 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, const char *defchr, 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 pageantc.c. * * agent_query returns NULL for here's-a-response, and non-NULL 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. * * When the return from agent_query is not NULL, it identifies the * in-progress query in case it needs to be cancelled. If * agent_cancel_query is called, then the pending query is destroyed * and the callback will not be called. (E.g. if you're going to throw * away the thing you were using as callback_ctx.) * * Passing a null pointer as callback forces agent_query to behave * synchronously, i.e. it will block if necessary, and guarantee to * return NULL. The wrapper function agent_query_synchronous() makes * this easier. */ typedef struct agent_pending_query agent_pending_query; agent_pending_query *agent_query( strbuf *in, void **out, int *outlen, void (*callback)(void *, void *, int), void *callback_ctx); void agent_cancel_query(agent_pending_query *); void agent_query_synchronous(strbuf *in, void **out, int *outlen); 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 pgp_fingerprints(void); /* * have_ssh_host_key() just returns true if a key of that type is * already cached and false otherwise. */ int have_ssh_host_key(const char *host, int port, const char *keytype); /* * 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); int is_interactive(void); void console_print_error_msg(const char *prefix, const char *msg); void console_print_error_msg_fmt_v( const char *prefix, const char *fmt, va_list ap); void console_print_error_msg_fmt(const char *prefix, const char *fmt, ...); /* * 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). * * Note that cmdline_process_param takes a const option string, but a * writable argument string. That's not a mistake - that's so it can * zero out password arguments in the hope of not having them show up * avoidably in Unix 'ps'. */ int cmdline_process_param(const char *, char *, int, Conf *); void cmdline_run_saved(Conf *); void cmdline_cleanup(void); int cmdline_get_passwd_input(prompts_t *p); int cmdline_host_ok(Conf *); #define TOOLTYPE_FILETRANSFER 1 #define TOOLTYPE_NONNETWORK 2 #define TOOLTYPE_HOST_ARG 4 #define TOOLTYPE_HOST_ARG_CAN_BE_SESSION 8 #define TOOLTYPE_HOST_ARG_PROTOCOL_PREFIX 16 #define TOOLTYPE_HOST_ARG_FROM_LAUNCHABLE_LOAD 32 #define TOOLTYPE_PORT_ARG 64 extern int cmdline_tooltype; void cmdline_error(const char *, ...); /* * Exports from config.c. */ struct controlbox; union control; void conf_radiobutton_handler(union control *ctrl, dlgparam *dlg, void *data, int event); #define CHECKBOX_INVERT (1<<30) void conf_checkbox_handler(union control *ctrl, dlgparam *dlg, void *data, int event); void conf_editbox_handler(union control *ctrl, dlgparam *dlg, void *data, int event); void conf_filesel_handler(union control *ctrl, dlgparam *dlg, void *data, int event); void conf_fontsel_handler(union control *ctrl, dlgparam *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 */ /* * An enum for the copy-paste UI action configuration. */ enum { CLIPUI_NONE, /* UI action has no copy/paste effect */ CLIPUI_IMPLICIT, /* use the default clipboard implicit in mouse actions */ CLIPUI_EXPLICIT, /* use the default clipboard for explicit Copy/Paste */ CLIPUI_CUSTOM, /* use a named clipboard (on systems that support it) */ }; /* * 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); void filename_serialise(BinarySink *bs, const Filename *f); Filename *filename_deserialise(BinarySource *src); char *get_username(void); /* return value needs freeing */ char *get_random_data(int bytes, const char *device); /* used in cmdgen.c */ char filename_char_sanitise(char c); /* rewrite special pathname chars */ int open_for_write_would_lose_data(const Filename *fn); /* * 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); unsigned long timing_last_clock(void); /* * Exports from callback.c. * * This provides a method of queuing function calls to be run at the * earliest convenience from the top-level event loop. Use it if * you're deep in a nested chain of calls and want to trigger an * action which will probably lead to your function being re-entered * recursively if you just call the initiating function the normal * way. * * Most front ends run the queued callbacks by simply calling * run_toplevel_callbacks() after handling each event in their * top-level event loop. However, if a front end doesn't have control * over its own event loop (e.g. because it's using GTK) then it can * instead request notifications when a callback is available, so that * it knows to ask its delegate event loop to do the same thing. Also, * if a front end needs to know whether a callback is pending without * actually running it (e.g. so as to put a zero timeout on a select() * call) then it can call toplevel_callback_pending(), which will * return true if at least one callback is in the queue. * * run_toplevel_callbacks() returns TRUE if it ran any actual code. * This can be used as a means of speculatively terminating a select * loop, as in PSFTP, for example - if a callback has run then perhaps * it might have done whatever the loop's caller was waiting for. */ typedef void (*toplevel_callback_fn_t)(void *ctx); void queue_toplevel_callback(toplevel_callback_fn_t fn, void *ctx); int run_toplevel_callbacks(void); int toplevel_callback_pending(void); void delete_callbacks_for_context(void *ctx); /* * Another facility in callback.c deals with 'idempotent' callbacks, * defined as those which never need to be scheduled again if they are * already scheduled and have not yet run. (An example would be one * which, when called, empties a queue of data completely: when data * is added to the queue, you must ensure a run of the queue-consuming * function has been scheduled, but if one is already pending, you * don't need to schedule a second one.) */ struct IdempotentCallback { toplevel_callback_fn_t fn; void *ctx; int queued; }; void queue_idempotent_callback(struct IdempotentCallback *ic); typedef void (*toplevel_callback_notify_fn_t)(void *ctx); void request_callback_notifications(toplevel_callback_notify_fn_t notify, void *ctx); /* * 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 */ #define HIGH_SURROGATE_START 0xd800 #define HIGH_SURROGATE_END 0xdbff #define LOW_SURROGATE_START 0xdc00 #define LOW_SURROGATE_END 0xdfff /* These macros exist in the Windows API, so the environment may * provide them. If not, define them in terms of the above. */ #ifndef IS_HIGH_SURROGATE #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