diff options
Diffstat (limited to 'tools/plink/ldisc.c')
| -rw-r--r-- | tools/plink/ldisc.c | 708 |
1 files changed, 360 insertions, 348 deletions
diff --git a/tools/plink/ldisc.c b/tools/plink/ldisc.c index 7ed42a37c..8f653a18f 100644 --- a/tools/plink/ldisc.c +++ b/tools/plink/ldisc.c @@ -1,348 +1,360 @@ -/*
- * ldisc.c: PuTTY line discipline. Sits between the input coming
- * from keypresses in the window, and the output channel leading to
- * the back end. Implements echo and/or local line editing,
- * depending on what's currently configured.
- */
-
-#include <stdio.h>
-#include <ctype.h>
-
-#include "putty.h"
-#include "terminal.h"
-#include "ldisc.h"
-
-#define ECHOING (ldisc->localecho == FORCE_ON || \
- (ldisc->localecho == AUTO && \
- (ldisc->back->ldisc(ldisc->backhandle, LD_ECHO) || \
- term_ldisc(ldisc->term, LD_ECHO))))
-#define EDITING (ldisc->localedit == FORCE_ON || \
- (ldisc->localedit == AUTO && \
- (ldisc->back->ldisc(ldisc->backhandle, LD_EDIT) || \
- term_ldisc(ldisc->term, LD_EDIT))))
-
-static void c_write(Ldisc ldisc, char *buf, int len)
-{
- from_backend(ldisc->frontend, 0, buf, len);
-}
-
-static int plen(Ldisc ldisc, unsigned char c)
-{
- if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(ldisc->term)))
- return 1;
- else if (c < 128)
- return 2; /* ^x for some x */
- else if (in_utf(ldisc->term) && c >= 0xC0)
- return 1; /* UTF-8 introducer character
- * (FIXME: combining / wide chars) */
- else if (in_utf(ldisc->term) && c >= 0x80 && c < 0xC0)
- return 0; /* UTF-8 followup character */
- else
- return 4; /* <XY> hex representation */
-}
-
-static void pwrite(Ldisc ldisc, unsigned char c)
-{
- if ((c >= 32 && c <= 126) ||
- (!in_utf(ldisc->term) && c >= 0xA0) ||
- (in_utf(ldisc->term) && c >= 0x80)) {
- c_write(ldisc, (char *)&c, 1);
- } else if (c < 128) {
- char cc[2];
- cc[1] = (c == 127 ? '?' : c + 0x40);
- cc[0] = '^';
- c_write(ldisc, cc, 2);
- } else {
- char cc[5];
- sprintf(cc, "<%02X>", c);
- c_write(ldisc, cc, 4);
- }
-}
-
-static int char_start(Ldisc ldisc, unsigned char c)
-{
- if (in_utf(ldisc->term))
- return (c < 0x80 || c >= 0xC0);
- else
- return 1;
-}
-
-static void bsb(Ldisc ldisc, int n)
-{
- while (n--)
- c_write(ldisc, "\010 \010", 3);
-}
-
-#define CTRL(x) (x^'@')
-#define KCTRL(x) ((x^'@') | 0x100)
-
-void *ldisc_create(Conf *conf, Terminal *term,
- Backend *back, void *backhandle,
- void *frontend)
-{
- Ldisc ldisc = snew(struct ldisc_tag);
-
- ldisc->buf = NULL;
- ldisc->buflen = 0;
- ldisc->bufsiz = 0;
- ldisc->quotenext = 0;
-
- ldisc->back = back;
- ldisc->backhandle = backhandle;
- ldisc->term = term;
- ldisc->frontend = frontend;
-
- ldisc_configure(ldisc, conf);
-
- /* Link ourselves into the backend and the terminal */
- if (term)
- term->ldisc = ldisc;
- if (back)
- back->provide_ldisc(backhandle, ldisc);
-
- return ldisc;
-}
-
-void ldisc_configure(void *handle, Conf *conf)
-{
- Ldisc ldisc = (Ldisc) handle;
-
- ldisc->telnet_keyboard = conf_get_int(conf, CONF_telnet_keyboard);
- ldisc->telnet_newline = conf_get_int(conf, CONF_telnet_newline);
- ldisc->protocol = conf_get_int(conf, CONF_protocol);
- ldisc->localecho = conf_get_int(conf, CONF_localecho);
- ldisc->localedit = conf_get_int(conf, CONF_localedit);
-}
-
-void ldisc_free(void *handle)
-{
- Ldisc ldisc = (Ldisc) handle;
-
- if (ldisc->term)
- ldisc->term->ldisc = NULL;
- if (ldisc->back)
- ldisc->back->provide_ldisc(ldisc->backhandle, NULL);
- if (ldisc->buf)
- sfree(ldisc->buf);
- sfree(ldisc);
-}
-
-void ldisc_send(void *handle, char *buf, int len, int interactive)
-{
- Ldisc ldisc = (Ldisc) handle;
- int keyflag = 0;
- /*
- * Called with len=0 when the options change. We must inform
- * the front end in case it needs to know.
- */
- if (len == 0) {
- ldisc_update(ldisc->frontend, ECHOING, EDITING);
- return;
- }
- /*
- * Notify the front end that something was pressed, in case
- * it's depending on finding out (e.g. keypress termination for
- * Close On Exit).
- */
- frontend_keypress(ldisc->frontend);
-
- /*
- * Less than zero means null terminated special string.
- */
- if (len < 0) {
- len = strlen(buf);
- keyflag = KCTRL('@');
- }
- /*
- * Either perform local editing, or just send characters.
- */
- if (EDITING) {
- while (len--) {
- int c;
- c = (unsigned char)(*buf++) + keyflag;
- if (!interactive && c == '\r')
- c += KCTRL('@');
- switch (ldisc->quotenext ? ' ' : c) {
- /*
- * ^h/^?: delete, and output BSBs, to return to
- * last character boundary (in UTF-8 mode this may
- * be more than one byte)
- * ^w: delete, and output BSBs, to return to last
- * space/nonspace boundary
- * ^u: delete, and output BSBs, to return to BOL
- * ^c: Do a ^u then send a telnet IP
- * ^z: Do a ^u then send a telnet SUSP
- * ^\: Do a ^u then send a telnet ABORT
- * ^r: echo "^R\n" and redraw line
- * ^v: quote next char
- * ^d: if at BOL, end of file and close connection,
- * else send line and reset to BOL
- * ^m: send line-plus-\r\n and reset to BOL
- */
- case KCTRL('H'):
- case KCTRL('?'): /* backspace/delete */
- if (ldisc->buflen > 0) {
- do {
- if (ECHOING)
- bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
- ldisc->buflen--;
- } while (!char_start(ldisc, ldisc->buf[ldisc->buflen]));
- }
- break;
- case CTRL('W'): /* delete word */
- while (ldisc->buflen > 0) {
- if (ECHOING)
- bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
- ldisc->buflen--;
- if (ldisc->buflen > 0 &&
- isspace((unsigned char)ldisc->buf[ldisc->buflen-1]) &&
- !isspace((unsigned char)ldisc->buf[ldisc->buflen]))
- break;
- }
- break;
- case CTRL('U'): /* delete line */
- case CTRL('C'): /* Send IP */
- case CTRL('\\'): /* Quit */
- case CTRL('Z'): /* Suspend */
- while (ldisc->buflen > 0) {
- if (ECHOING)
- bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
- ldisc->buflen--;
- }
- ldisc->back->special(ldisc->backhandle, TS_EL);
- /*
- * We don't send IP, SUSP or ABORT if the user has
- * configured telnet specials off! This breaks
- * talkers otherwise.
- */
- if (!ldisc->telnet_keyboard)
- goto default_case;
- if (c == CTRL('C'))
- ldisc->back->special(ldisc->backhandle, TS_IP);
- if (c == CTRL('Z'))
- ldisc->back->special(ldisc->backhandle, TS_SUSP);
- if (c == CTRL('\\'))
- ldisc->back->special(ldisc->backhandle, TS_ABORT);
- break;
- case CTRL('R'): /* redraw line */
- if (ECHOING) {
- int i;
- c_write(ldisc, "^R\r\n", 4);
- for (i = 0; i < ldisc->buflen; i++)
- pwrite(ldisc, ldisc->buf[i]);
- }
- break;
- case CTRL('V'): /* quote next char */
- ldisc->quotenext = TRUE;
- break;
- case CTRL('D'): /* logout or send */
- if (ldisc->buflen == 0) {
- ldisc->back->special(ldisc->backhandle, TS_EOF);
- } else {
- ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen);
- ldisc->buflen = 0;
- }
- break;
- /*
- * This particularly hideous bit of code from RDB
- * allows ordinary ^M^J to do the same thing as
- * magic-^M when in Raw protocol. The line `case
- * KCTRL('M'):' is _inside_ the if block. Thus:
- *
- * - receiving regular ^M goes straight to the
- * default clause and inserts as a literal ^M.
- * - receiving regular ^J _not_ directly after a
- * literal ^M (or not in Raw protocol) fails the
- * if condition, leaps to the bottom of the if,
- * and falls through into the default clause
- * again.
- * - receiving regular ^J just after a literal ^M
- * in Raw protocol passes the if condition,
- * deletes the literal ^M, and falls through
- * into the magic-^M code
- * - receiving a magic-^M empties the line buffer,
- * signals end-of-line in one of the various
- * entertaining ways, and _doesn't_ fall out of
- * the bottom of the if and through to the
- * default clause because of the break.
- */
- case CTRL('J'):
- if (ldisc->protocol == PROT_RAW &&
- ldisc->buflen > 0 && ldisc->buf[ldisc->buflen - 1] == '\r') {
- if (ECHOING)
- bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
- ldisc->buflen--;
- /* FALLTHROUGH */
- case KCTRL('M'): /* send with newline */
- if (ldisc->buflen > 0)
- ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen);
- if (ldisc->protocol == PROT_RAW)
- ldisc->back->send(ldisc->backhandle, "\r\n", 2);
- else if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline)
- ldisc->back->special(ldisc->backhandle, TS_EOL);
- else
- ldisc->back->send(ldisc->backhandle, "\r", 1);
- if (ECHOING)
- c_write(ldisc, "\r\n", 2);
- ldisc->buflen = 0;
- break;
- }
- /* FALLTHROUGH */
- default: /* get to this label from ^V handler */
- default_case:
- if (ldisc->buflen >= ldisc->bufsiz) {
- ldisc->bufsiz = ldisc->buflen + 256;
- ldisc->buf = sresize(ldisc->buf, ldisc->bufsiz, char);
- }
- ldisc->buf[ldisc->buflen++] = c;
- if (ECHOING)
- pwrite(ldisc, (unsigned char) c);
- ldisc->quotenext = FALSE;
- break;
- }
- }
- } else {
- if (ldisc->buflen != 0) {
- ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen);
- while (ldisc->buflen > 0) {
- bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
- ldisc->buflen--;
- }
- }
- if (len > 0) {
- if (ECHOING)
- c_write(ldisc, buf, len);
- if (keyflag && ldisc->protocol == PROT_TELNET && len == 1) {
- switch (buf[0]) {
- case CTRL('M'):
- if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline)
- ldisc->back->special(ldisc->backhandle, TS_EOL);
- else
- ldisc->back->send(ldisc->backhandle, "\r", 1);
- break;
- case CTRL('?'):
- case CTRL('H'):
- if (ldisc->telnet_keyboard) {
- ldisc->back->special(ldisc->backhandle, TS_EC);
- break;
- }
- case CTRL('C'):
- if (ldisc->telnet_keyboard) {
- ldisc->back->special(ldisc->backhandle, TS_IP);
- break;
- }
- case CTRL('Z'):
- if (ldisc->telnet_keyboard) {
- ldisc->back->special(ldisc->backhandle, TS_SUSP);
- break;
- }
-
- default:
- ldisc->back->send(ldisc->backhandle, buf, len);
- break;
- }
- } else
- ldisc->back->send(ldisc->backhandle, buf, len);
- }
- }
-}
+/* + * ldisc.c: PuTTY line discipline. Sits between the input coming + * from keypresses in the window, and the output channel leading to + * the back end. Implements echo and/or local line editing, + * depending on what's currently configured. + */ + +#include <stdio.h> +#include <ctype.h> + +#include "putty.h" +#include "terminal.h" +#include "ldisc.h" + +#define ECHOING (ldisc->localecho == FORCE_ON || \ + (ldisc->localecho == AUTO && \ + (ldisc->back->ldisc(ldisc->backhandle, LD_ECHO) || \ + term_ldisc(ldisc->term, LD_ECHO)))) +#define EDITING (ldisc->localedit == FORCE_ON || \ + (ldisc->localedit == AUTO && \ + (ldisc->back->ldisc(ldisc->backhandle, LD_EDIT) || \ + term_ldisc(ldisc->term, LD_EDIT)))) + +static void c_write(Ldisc ldisc, char *buf, int len) +{ + from_backend(ldisc->frontend, 0, buf, len); +} + +static int plen(Ldisc ldisc, unsigned char c) +{ + if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(ldisc->term))) + return 1; + else if (c < 128) + return 2; /* ^x for some x */ + else if (in_utf(ldisc->term) && c >= 0xC0) + return 1; /* UTF-8 introducer character + * (FIXME: combining / wide chars) */ + else if (in_utf(ldisc->term) && c >= 0x80 && c < 0xC0) + return 0; /* UTF-8 followup character */ + else + return 4; /* <XY> hex representation */ +} + +static void pwrite(Ldisc ldisc, unsigned char c) +{ + if ((c >= 32 && c <= 126) || + (!in_utf(ldisc->term) && c >= 0xA0) || + (in_utf(ldisc->term) && c >= 0x80)) { + c_write(ldisc, (char *)&c, 1); + } else if (c < 128) { + char cc[2]; + cc[1] = (c == 127 ? '?' : c + 0x40); + cc[0] = '^'; + c_write(ldisc, cc, 2); + } else { + char cc[5]; + sprintf(cc, "<%02X>", c); + c_write(ldisc, cc, 4); + } +} + +static int char_start(Ldisc ldisc, unsigned char c) +{ + if (in_utf(ldisc->term)) + return (c < 0x80 || c >= 0xC0); + else + return 1; +} + +static void bsb(Ldisc ldisc, int n) +{ + while (n--) + c_write(ldisc, "\010 \010", 3); +} + +#define CTRL(x) (x^'@') +#define KCTRL(x) ((x^'@') | 0x100) + +void *ldisc_create(Conf *conf, Terminal *term, + Backend *back, void *backhandle, + void *frontend) +{ + Ldisc ldisc = snew(struct ldisc_tag); + + ldisc->buf = NULL; + ldisc->buflen = 0; + ldisc->bufsiz = 0; + ldisc->quotenext = 0; + + ldisc->back = back; + ldisc->backhandle = backhandle; + ldisc->term = term; + ldisc->frontend = frontend; + + ldisc_configure(ldisc, conf); + + /* Link ourselves into the backend and the terminal */ + if (term) + term->ldisc = ldisc; + if (back) + back->provide_ldisc(backhandle, ldisc); + + return ldisc; +} + +void ldisc_configure(void *handle, Conf *conf) +{ + Ldisc ldisc = (Ldisc) handle; + + ldisc->telnet_keyboard = conf_get_int(conf, CONF_telnet_keyboard); + ldisc->telnet_newline = conf_get_int(conf, CONF_telnet_newline); + ldisc->protocol = conf_get_int(conf, CONF_protocol); + ldisc->localecho = conf_get_int(conf, CONF_localecho); + ldisc->localedit = conf_get_int(conf, CONF_localedit); +} + +void ldisc_free(void *handle) +{ + Ldisc ldisc = (Ldisc) handle; + + if (ldisc->term) + ldisc->term->ldisc = NULL; + if (ldisc->back) + ldisc->back->provide_ldisc(ldisc->backhandle, NULL); + if (ldisc->buf) + sfree(ldisc->buf); + sfree(ldisc); +} + +void ldisc_send(void *handle, char *buf, int len, int interactive) +{ + Ldisc ldisc = (Ldisc) handle; + int keyflag = 0; + /* + * Called with len=0 when the options change. We must inform + * the front end in case it needs to know. + */ + if (len == 0) { + ldisc_update(ldisc->frontend, ECHOING, EDITING); + return; + } + /* + * Notify the front end that something was pressed, in case + * it's depending on finding out (e.g. keypress termination for + * Close On Exit). + */ + frontend_keypress(ldisc->frontend); + + if (interactive && ldisc->term) { + /* + * Interrupt a paste from the clipboard, if one was in + * progress when the user pressed a key. This is easier than + * buffering the current piece of data and saving it until the + * terminal has finished pasting, and has the potential side + * benefit of permitting a user to cancel an accidental huge + * paste. + */ + term_nopaste(ldisc->term); + } + + /* + * Less than zero means null terminated special string. + */ + if (len < 0) { + len = strlen(buf); + keyflag = KCTRL('@'); + } + /* + * Either perform local editing, or just send characters. + */ + if (EDITING) { + while (len--) { + int c; + c = (unsigned char)(*buf++) + keyflag; + if (!interactive && c == '\r') + c += KCTRL('@'); + switch (ldisc->quotenext ? ' ' : c) { + /* + * ^h/^?: delete, and output BSBs, to return to + * last character boundary (in UTF-8 mode this may + * be more than one byte) + * ^w: delete, and output BSBs, to return to last + * space/nonspace boundary + * ^u: delete, and output BSBs, to return to BOL + * ^c: Do a ^u then send a telnet IP + * ^z: Do a ^u then send a telnet SUSP + * ^\: Do a ^u then send a telnet ABORT + * ^r: echo "^R\n" and redraw line + * ^v: quote next char + * ^d: if at BOL, end of file and close connection, + * else send line and reset to BOL + * ^m: send line-plus-\r\n and reset to BOL + */ + case KCTRL('H'): + case KCTRL('?'): /* backspace/delete */ + if (ldisc->buflen > 0) { + do { + if (ECHOING) + bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1])); + ldisc->buflen--; + } while (!char_start(ldisc, ldisc->buf[ldisc->buflen])); + } + break; + case CTRL('W'): /* delete word */ + while (ldisc->buflen > 0) { + if (ECHOING) + bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1])); + ldisc->buflen--; + if (ldisc->buflen > 0 && + isspace((unsigned char)ldisc->buf[ldisc->buflen-1]) && + !isspace((unsigned char)ldisc->buf[ldisc->buflen])) + break; + } + break; + case CTRL('U'): /* delete line */ + case CTRL('C'): /* Send IP */ + case CTRL('\\'): /* Quit */ + case CTRL('Z'): /* Suspend */ + while (ldisc->buflen > 0) { + if (ECHOING) + bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1])); + ldisc->buflen--; + } + ldisc->back->special(ldisc->backhandle, TS_EL); + /* + * We don't send IP, SUSP or ABORT if the user has + * configured telnet specials off! This breaks + * talkers otherwise. + */ + if (!ldisc->telnet_keyboard) + goto default_case; + if (c == CTRL('C')) + ldisc->back->special(ldisc->backhandle, TS_IP); + if (c == CTRL('Z')) + ldisc->back->special(ldisc->backhandle, TS_SUSP); + if (c == CTRL('\\')) + ldisc->back->special(ldisc->backhandle, TS_ABORT); + break; + case CTRL('R'): /* redraw line */ + if (ECHOING) { + int i; + c_write(ldisc, "^R\r\n", 4); + for (i = 0; i < ldisc->buflen; i++) + pwrite(ldisc, ldisc->buf[i]); + } + break; + case CTRL('V'): /* quote next char */ + ldisc->quotenext = TRUE; + break; + case CTRL('D'): /* logout or send */ + if (ldisc->buflen == 0) { + ldisc->back->special(ldisc->backhandle, TS_EOF); + } else { + ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen); + ldisc->buflen = 0; + } + break; + /* + * This particularly hideous bit of code from RDB + * allows ordinary ^M^J to do the same thing as + * magic-^M when in Raw protocol. The line `case + * KCTRL('M'):' is _inside_ the if block. Thus: + * + * - receiving regular ^M goes straight to the + * default clause and inserts as a literal ^M. + * - receiving regular ^J _not_ directly after a + * literal ^M (or not in Raw protocol) fails the + * if condition, leaps to the bottom of the if, + * and falls through into the default clause + * again. + * - receiving regular ^J just after a literal ^M + * in Raw protocol passes the if condition, + * deletes the literal ^M, and falls through + * into the magic-^M code + * - receiving a magic-^M empties the line buffer, + * signals end-of-line in one of the various + * entertaining ways, and _doesn't_ fall out of + * the bottom of the if and through to the + * default clause because of the break. + */ + case CTRL('J'): + if (ldisc->protocol == PROT_RAW && + ldisc->buflen > 0 && ldisc->buf[ldisc->buflen - 1] == '\r') { + if (ECHOING) + bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1])); + ldisc->buflen--; + /* FALLTHROUGH */ + case KCTRL('M'): /* send with newline */ + if (ldisc->buflen > 0) + ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen); + if (ldisc->protocol == PROT_RAW) + ldisc->back->send(ldisc->backhandle, "\r\n", 2); + else if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline) + ldisc->back->special(ldisc->backhandle, TS_EOL); + else + ldisc->back->send(ldisc->backhandle, "\r", 1); + if (ECHOING) + c_write(ldisc, "\r\n", 2); + ldisc->buflen = 0; + break; + } + /* FALLTHROUGH */ + default: /* get to this label from ^V handler */ + default_case: + if (ldisc->buflen >= ldisc->bufsiz) { + ldisc->bufsiz = ldisc->buflen + 256; + ldisc->buf = sresize(ldisc->buf, ldisc->bufsiz, char); + } + ldisc->buf[ldisc->buflen++] = c; + if (ECHOING) + pwrite(ldisc, (unsigned char) c); + ldisc->quotenext = FALSE; + break; + } + } + } else { + if (ldisc->buflen != 0) { + ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen); + while (ldisc->buflen > 0) { + bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1])); + ldisc->buflen--; + } + } + if (len > 0) { + if (ECHOING) + c_write(ldisc, buf, len); + if (keyflag && ldisc->protocol == PROT_TELNET && len == 1) { + switch (buf[0]) { + case CTRL('M'): + if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline) + ldisc->back->special(ldisc->backhandle, TS_EOL); + else + ldisc->back->send(ldisc->backhandle, "\r", 1); + break; + case CTRL('?'): + case CTRL('H'): + if (ldisc->telnet_keyboard) { + ldisc->back->special(ldisc->backhandle, TS_EC); + break; + } + case CTRL('C'): + if (ldisc->telnet_keyboard) { + ldisc->back->special(ldisc->backhandle, TS_IP); + break; + } + case CTRL('Z'): + if (ldisc->telnet_keyboard) { + ldisc->back->special(ldisc->backhandle, TS_SUSP); + break; + } + + default: + ldisc->back->send(ldisc->backhandle, buf, len); + break; + } + } else + ldisc->back->send(ldisc->backhandle, buf, len); + } + } +} |