2 * PLink - a command-line (stdin/stdout) variant of PuTTY.
15 #include <sys/ioctl.h>
17 #ifndef HAVE_NO_SYS_SELECT_H
18 #include <sys/select.h>
21 #define PUTTY_DO_GLOBALS /* actually _define_ globals */
26 #define MAX_STDIN_BACKLOG 4096
30 static struct termios orig_termios;
32 void fatalbox(char *p, ...)
37 fprintf(stderr, "FATAL ERROR: ");
39 vfprintf(stderr, p, ap);
49 void modalfatalbox(char *p, ...)
54 fprintf(stderr, "FATAL ERROR: ");
56 vfprintf(stderr, p, ap);
66 void nonfatal(char *p, ...)
71 fprintf(stderr, "ERROR: ");
73 vfprintf(stderr, p, ap);
82 void connection_fatal(void *frontend, char *p, ...)
87 fprintf(stderr, "FATAL ERROR: ");
89 vfprintf(stderr, p, ap);
99 void cmdline_error(char *p, ...)
104 fprintf(stderr, "plink: ");
106 vfprintf(stderr, p, ap);
113 static int local_tty = FALSE; /* do we have a local tty? */
115 static Backend *back;
116 static void *backhandle;
120 * Default settings that are specific to pterm.
122 char *platform_default_s(const char *name)
124 if (!strcmp(name, "TermType"))
125 return dupstr(getenv("TERM"));
126 if (!strcmp(name, "UserName"))
127 return get_username();
128 if (!strcmp(name, "SerialLine"))
129 return dupstr("/dev/ttyS0");
133 int platform_default_i(const char *name, int def)
138 FontSpec *platform_default_fontspec(const char *name)
140 return fontspec_new("");
143 Filename *platform_default_filename(const char *name)
145 if (!strcmp(name, "LogFileName"))
146 return filename_from_str("putty.log");
148 return filename_from_str("");
151 char *x_get_default(const char *key)
153 return NULL; /* this is a stub */
155 int term_ldisc(Terminal *term, int mode)
159 void ldisc_update(void *frontend, int echo, int edit)
161 /* Update stdin read mode to reflect changes in line discipline. */
164 if (!local_tty) return;
169 mode.c_lflag |= ECHO;
171 mode.c_lflag &= ~ECHO;
174 mode.c_iflag |= ICRNL;
175 mode.c_lflag |= ISIG | ICANON;
176 mode.c_oflag |= OPOST;
178 mode.c_iflag &= ~ICRNL;
179 mode.c_lflag &= ~(ISIG | ICANON);
180 mode.c_oflag &= ~OPOST;
181 /* Solaris sets these to unhelpful values */
183 mode.c_cc[VTIME] = 0;
184 /* FIXME: perhaps what we do with IXON/IXOFF should be an
185 * argument to ldisc_update(), to allow implementation of SSH-2
186 * "xon-xoff" and Rlogin's equivalent? */
187 mode.c_iflag &= ~IXON;
188 mode.c_iflag &= ~IXOFF;
191 * Mark parity errors and (more important) BREAK on input. This
192 * is more complex than it need be because POSIX-2001 suggests
193 * that escaping of valid 0xff in the input stream is dependent on
194 * IGNPAR being clear even though marking of BREAK isn't. NetBSD
195 * 2.0 goes one worse and makes it dependent on INPCK too. We
196 * deal with this by forcing these flags into a useful state and
197 * then faking the state in which we found them in from_tty() if
198 * we get passed a parity or framing error.
200 mode.c_iflag = (mode.c_iflag | INPCK | PARMRK) & ~IGNPAR;
202 tcsetattr(STDIN_FILENO, TCSANOW, &mode);
205 /* Helper function to extract a special character from a termios. */
206 static char *get_ttychar(struct termios *t, int index)
208 cc_t c = t->c_cc[index];
209 #if defined(_POSIX_VDISABLE)
210 if (c == _POSIX_VDISABLE)
211 return dupprintf("");
213 return dupprintf("^<%d>", c);
216 char *get_ttymode(void *frontend, const char *mode)
219 * Propagate appropriate terminal modes from the local terminal,
222 if (!local_tty) return NULL;
224 #define GET_CHAR(ourname, uxname) \
226 if (strcmp(mode, ourname) == 0) \
227 return get_ttychar(&orig_termios, uxname); \
229 #define GET_BOOL(ourname, uxname, uxmemb, transform) \
231 if (strcmp(mode, ourname) == 0) { \
232 int b = (orig_termios.uxmemb & uxname) != 0; \
234 return dupprintf("%d", b); \
239 * Modes that want to be the same on all terminal devices involved.
241 /* All the special characters supported by SSH */
243 GET_CHAR("INTR", VINTR);
246 GET_CHAR("QUIT", VQUIT);
249 GET_CHAR("ERASE", VERASE);
252 GET_CHAR("KILL", VKILL);
255 GET_CHAR("EOF", VEOF);
258 GET_CHAR("EOL", VEOL);
261 GET_CHAR("EOL2", VEOL2);
264 GET_CHAR("START", VSTART);
267 GET_CHAR("STOP", VSTOP);
270 GET_CHAR("SUSP", VSUSP);
273 GET_CHAR("DSUSP", VDSUSP);
275 #if defined(VREPRINT)
276 GET_CHAR("REPRINT", VREPRINT);
279 GET_CHAR("WERASE", VWERASE);
282 GET_CHAR("LNEXT", VLNEXT);
285 GET_CHAR("FLUSH", VFLUSH);
288 GET_CHAR("SWTCH", VSWTCH);
291 GET_CHAR("STATUS", VSTATUS);
293 #if defined(VDISCARD)
294 GET_CHAR("DISCARD", VDISCARD);
296 /* Modes that "configure" other major modes. These should probably be
297 * considered as user preferences. */
298 /* Configuration of ICANON */
300 GET_BOOL("ECHOK", ECHOK, c_lflag, );
303 GET_BOOL("ECHOKE", ECHOKE, c_lflag, );
306 GET_BOOL("ECHOE", ECHOE, c_lflag, );
309 GET_BOOL("ECHONL", ECHONL, c_lflag, );
312 GET_BOOL("XCASE", XCASE, c_lflag, );
314 /* Configuration of ECHO */
316 GET_BOOL("ECHOCTL", ECHOCTL, c_lflag, );
318 /* Configuration of IXON/IXOFF */
320 GET_BOOL("IXANY", IXANY, c_iflag, );
322 /* Configuration of OPOST */
324 GET_BOOL("OLCUC", OLCUC, c_oflag, );
327 GET_BOOL("ONLCR", ONLCR, c_oflag, );
330 GET_BOOL("OCRNL", OCRNL, c_oflag, );
333 GET_BOOL("ONOCR", ONOCR, c_oflag, );
336 GET_BOOL("ONLRET", ONLRET, c_oflag, );
340 * Modes that want to be set in only one place, and that we have
344 GET_BOOL("ISIG", ISIG, c_lflag, );
347 GET_BOOL("ICANON", ICANON, c_lflag, );
350 GET_BOOL("ECHO", ECHO, c_lflag, );
353 GET_BOOL("IXON", IXON, c_iflag, );
356 GET_BOOL("IXOFF", IXOFF, c_iflag, );
359 GET_BOOL("OPOST", OPOST, c_oflag, );
363 * We do not propagate the following modes:
364 * - Parity/serial settings, which are a local affair and don't
365 * make sense propagated over SSH's 8-bit byte-stream.
366 * IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
367 * - Things that want to be enabled in one place that we don't
372 * - Things I don't know what to do with. (FIXME)
373 * ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
380 /* Fall through to here for unrecognised names, or ones that are
381 * unsupported on this platform */
385 void cleanup_termios(void)
388 tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
391 bufchain stdout_data, stderr_data;
392 enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
394 int try_output(int is_stderr)
396 bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
397 int fd = (is_stderr ? STDERR_FILENO : STDOUT_FILENO);
401 if (bufchain_size(chain) > 0) {
402 int prev_nonblock = nonblock(fd);
404 bufchain_prefix(chain, &senddata, &sendlen);
405 ret = write(fd, senddata, sendlen);
407 bufchain_consume(chain, ret);
408 } while (ret == sendlen && bufchain_size(chain) != 0);
411 if (ret < 0 && errno != EAGAIN) {
412 perror(is_stderr ? "stderr: write" : "stdout: write");
416 if (outgoingeof == EOF_PENDING && bufchain_size(&stdout_data) == 0) {
417 close(STDOUT_FILENO);
418 outgoingeof = EOF_SENT;
420 return bufchain_size(&stdout_data) + bufchain_size(&stderr_data);
423 int from_backend(void *frontend_handle, int is_stderr,
424 const char *data, int len)
427 bufchain_add(&stderr_data, data, len);
428 return try_output(TRUE);
430 assert(outgoingeof == EOF_NO);
431 bufchain_add(&stdout_data, data, len);
432 return try_output(FALSE);
436 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
439 * No "untrusted" output should get here (the way the code is
440 * currently, it's all diverted by FLAG_STDERR).
442 assert(!"Unexpected call to from_backend_untrusted()");
443 return 0; /* not reached */
446 int from_backend_eof(void *frontend_handle)
448 assert(outgoingeof == EOF_NO);
449 outgoingeof = EOF_PENDING;
451 return FALSE; /* do not respond to incoming EOF with outgoing */
454 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
457 ret = cmdline_get_passwd_input(p, in, inlen);
459 ret = console_get_userpass_input(p, in, inlen);
464 * Handle data from a local tty in PARMRK format.
466 static void from_tty(void *vbuf, unsigned len)
468 char *p, *q, *end, *buf = vbuf;
469 static enum {NORMAL, FF, FF00} state = NORMAL;
471 p = buf; end = buf + len;
479 q = memchr(p, '\xff', end - p);
480 if (q == NULL) q = end;
481 back->send(backhandle, p, q - p);
487 back->send(backhandle, p, 1);
490 } else if (*p == '\0') {
497 back->special(backhandle, TS_BRK);
500 * Pretend that PARMRK wasn't set. This involves
501 * faking what INPCK and IGNPAR would have done if
502 * we hadn't overridden them. Unfortunately, we
503 * can't do this entirely correctly because INPCK
504 * distinguishes between framing and parity
505 * errors, but PARMRK format represents both in
506 * the same way. We assume that parity errors are
507 * more common than framing errors, and hence
508 * treat all input errors as being subject to
511 if (orig_termios.c_iflag & INPCK) {
512 /* If IGNPAR is set, we throw away the character. */
513 if (!(orig_termios.c_iflag & IGNPAR)) {
514 /* PE/FE get passed on as NUL. */
516 back->send(backhandle, p, 1);
519 /* INPCK not set. Assume we got a parity error. */
520 back->send(backhandle, p, 1);
531 void sigwinch(int signum)
533 if (write(signalpipe[1], "x", 1) <= 0)
534 /* not much we can do about it */;
538 * In Plink our selects are synchronous, so these functions are
541 int uxsel_input_add(int fd, int rwx) { return 0; }
542 void uxsel_input_remove(int id) { }
545 * Short description of parameters.
547 static void usage(void)
549 printf("PuTTY Link: command-line connection utility\n");
551 printf("Usage: plink [options] [user@]host [command]\n");
552 printf(" (\"host\" can also be a PuTTY saved session name)\n");
553 printf("Options:\n");
554 printf(" -V print version information and exit\n");
555 printf(" -pgpfp print PGP key fingerprints and exit\n");
556 printf(" -v show verbose messages\n");
557 printf(" -load sessname Load settings from saved session\n");
558 printf(" -ssh -telnet -rlogin -raw -serial\n");
559 printf(" force use of a particular protocol\n");
560 printf(" -P port connect to specified port\n");
561 printf(" -l user connect with specified username\n");
562 printf(" -batch disable all interactive prompts\n");
563 printf("The following options only apply to SSH connections:\n");
564 printf(" -pw passw login with specified password\n");
565 printf(" -D [listen-IP:]listen-port\n");
566 printf(" Dynamic SOCKS-based port forwarding\n");
567 printf(" -L [listen-IP:]listen-port:host:port\n");
568 printf(" Forward local port to remote address\n");
569 printf(" -R [listen-IP:]listen-port:host:port\n");
570 printf(" Forward remote port to local address\n");
571 printf(" -X -x enable / disable X11 forwarding\n");
572 printf(" -A -a enable / disable agent forwarding\n");
573 printf(" -t -T enable / disable pty allocation\n");
574 printf(" -1 -2 force use of particular protocol version\n");
575 printf(" -4 -6 force use of IPv4 or IPv6\n");
576 printf(" -C enable compression\n");
577 printf(" -i key private key file for authentication\n");
578 printf(" -noagent disable use of Pageant\n");
579 printf(" -agent enable use of Pageant\n");
580 printf(" -m file read remote command(s) from file\n");
581 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
582 printf(" -N don't start a shell/command (SSH-2 only)\n");
583 printf(" -nc host:port\n");
584 printf(" open tunnel in place of session (SSH-2 only)\n");
585 printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
586 printf(" Specify the serial configuration (serial only)\n");
590 static void version(void)
592 printf("plink: %s\n", ver);
596 void frontend_net_error_pending(void) {}
598 int main(int argc, char **argv)
604 int i, fdcount, fdsize, fdstate;
608 int use_subsystem = 0;
609 int got_host = FALSE;
614 fdcount = fdsize = 0;
616 * Initialise port and protocol to sensible defaults. (These
617 * will be overridden by more or less anything.)
619 default_protocol = PROT_SSH;
622 bufchain_init(&stdout_data);
623 bufchain_init(&stderr_data);
624 outgoingeof = EOF_NO;
626 flags = FLAG_STDERR | FLAG_STDERR_TTY;
630 * Process the command line.
633 do_defaults(NULL, conf);
634 loaded_session = FALSE;
635 default_protocol = conf_get_int(conf, CONF_protocol);
636 default_port = conf_get_int(conf, CONF_port);
640 * Override the default protocol if PLINK_PROTOCOL is set.
642 char *p = getenv("PLINK_PROTOCOL");
644 const Backend *b = backend_from_name(p);
646 default_protocol = b->protocol;
647 default_port = b->default_port;
648 conf_set_int(conf, CONF_protocol, default_protocol);
649 conf_set_int(conf, CONF_port, default_port);
656 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
660 "plink: option \"%s\" requires an argument\n", p);
662 } else if (ret == 2) {
664 } else if (ret == 1) {
666 } else if (!strcmp(p, "-batch")) {
667 console_batch_mode = 1;
668 } else if (!strcmp(p, "-s")) {
669 /* Save status to write to conf later. */
671 } else if (!strcmp(p, "-V") || !strcmp(p, "--version")) {
673 } else if (!strcmp(p, "--help")) {
676 } else if (!strcmp(p, "-pgpfp")) {
679 } else if (!strcmp(p, "-o")) {
682 "plink: option \"-o\" requires an argument\n");
686 provide_xrm_string(*++argv);
689 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
693 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
697 * If the hostname starts with "telnet:", set the
698 * protocol to Telnet and process the string as a
701 if (!strncmp(q, "telnet:", 7)) {
705 if (q[0] == '/' && q[1] == '/')
707 conf_set_int(conf, CONF_protocol, PROT_TELNET);
709 while (*p && *p != ':' && *p != '/')
715 conf_set_int(conf, CONF_port, atoi(p));
717 conf_set_int(conf, CONF_port, -1);
718 conf_set_str(conf, CONF_host, q);
721 char *r, *user, *host;
723 * Before we process the [user@]host string, we
724 * first check for the presence of a protocol
725 * prefix (a protocol name followed by ",").
731 b = backend_from_name(p);
733 default_protocol = b->protocol;
734 conf_set_int(conf, CONF_protocol,
736 portnumber = b->default_port;
742 * A nonzero length string followed by an @ is treated
743 * as a username. (We discount an _initial_ @.) The
744 * rest of the string (or the whole string if no @)
745 * is treated as a session name and/or hostname.
749 p++, r = NULL; /* discount initial @ */
754 user = NULL, host = p;
758 * Now attempt to load a saved session with the
759 * same name as the hostname.
762 Conf *conf2 = conf_new();
763 do_defaults(host, conf2);
764 if (loaded_session || !conf_launchable(conf2)) {
765 /* No settings for this host; use defaults */
766 /* (or session was already loaded with -load) */
767 conf_set_str(conf, CONF_host, host);
768 conf_set_int(conf, CONF_port, default_port);
771 conf_copy_into(conf, conf2);
772 loaded_session = TRUE;
778 /* Patch in specified username. */
779 conf_set_str(conf, CONF_username, user);
786 cmdlen = cmdsize = 0;
791 if (cmdlen >= cmdsize) {
792 cmdsize = cmdlen + 512;
793 command = sresize(command, cmdsize, char);
795 command[cmdlen++]=*p++;
797 if (cmdlen >= cmdsize) {
798 cmdsize = cmdlen + 512;
799 command = sresize(command, cmdsize, char);
801 command[cmdlen++]=' '; /* always add trailing space */
802 if (--argc) p = *++argv;
804 if (cmdlen) command[--cmdlen]='\0';
805 /* change trailing blank to NUL */
806 conf_set_str(conf, CONF_remote_cmd, command);
807 conf_set_str(conf, CONF_remote_cmd2, "");
808 conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
810 break; /* done with cmdline */
818 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
823 * Muck about with the hostname in various ways.
826 char *hostbuf = dupstr(conf_get_str(conf, CONF_host));
827 char *host = hostbuf;
831 * Trim leading whitespace.
833 host += strspn(host, " \t");
836 * See if host is of the form user@host, and separate out
837 * the username if so.
839 if (host[0] != '\0') {
840 char *atsign = strrchr(host, '@');
843 conf_set_str(conf, CONF_username, host);
849 * Trim off a colon suffix if it's there.
851 host[strcspn(host, ":")] = '\0';
854 * Remove any remaining whitespace.
859 if (*q != ' ' && *q != '\t')
865 conf_set_str(conf, CONF_host, hostbuf);
870 * Perform command-line overrides on session configuration.
872 cmdline_run_saved(conf);
875 * Apply subsystem status.
878 conf_set_int(conf, CONF_ssh_subsys, TRUE);
880 if (!*conf_get_str(conf, CONF_remote_cmd) &&
881 !*conf_get_str(conf, CONF_remote_cmd2) &&
882 !*conf_get_str(conf, CONF_ssh_nc_host))
883 flags |= FLAG_INTERACTIVE;
886 * Select protocol. This is farmed out into a table in a
887 * separate file to enable an ssh-free variant.
889 back = backend_from_proto(conf_get_int(conf, CONF_protocol));
892 "Internal fault: Unsupported protocol found\n");
899 if (portnumber != -1)
900 conf_set_int(conf, CONF_port, portnumber);
903 * Block SIGPIPE, so that we'll get EPIPE individually on
904 * particular network connections that go wrong.
906 putty_signal(SIGPIPE, SIG_IGN);
909 * Set up the pipe we'll use to tell us about SIGWINCH.
911 if (pipe(signalpipe) < 0) {
915 putty_signal(SIGWINCH, sigwinch);
918 * Now that we've got the SIGWINCH handler installed, try to find
919 * out the initial terminal size.
921 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &size) >= 0) {
922 conf_set_int(conf, CONF_width, size.ws_col);
923 conf_set_int(conf, CONF_height, size.ws_row);
930 * Unix Plink doesn't provide any way to add forwardings after the
931 * connection is set up, so if there are none now, we can safely set
934 if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
935 !conf_get_int(conf, CONF_x11_forward) &&
936 !conf_get_int(conf, CONF_agentfwd) &&
937 !conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
938 conf_set_int(conf, CONF_ssh_simple, TRUE);
941 * Start up the connection.
943 logctx = log_init(NULL, conf);
944 console_provide_logctx(logctx);
948 /* nodelay is only useful if stdin is a terminal device */
949 int nodelay = conf_get_int(conf, CONF_tcp_nodelay) && isatty(0);
951 error = back->init(NULL, &backhandle, conf,
952 conf_get_str(conf, CONF_host),
953 conf_get_int(conf, CONF_port),
955 conf_get_int(conf, CONF_tcp_keepalives));
957 fprintf(stderr, "Unable to open connection:\n%s\n", error);
960 back->provide_logctx(backhandle, logctx);
961 ldisc_create(conf, NULL, back, backhandle, NULL);
967 * Set up the initial console mode. We don't care if this call
968 * fails, because we know we aren't necessarily running in a
971 local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
972 atexit(cleanup_termios);
973 ldisc_update(NULL, 1, 1);
975 now = GETTICKCOUNT();
978 fd_set rset, wset, xset;
988 FD_SET_MAX(signalpipe[0], maxfd, rset);
990 if (connopen && !sending &&
991 back->connected(backhandle) &&
992 back->sendok(backhandle) &&
993 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
994 /* If we're OK to send, then try to read from stdin. */
995 FD_SET_MAX(STDIN_FILENO, maxfd, rset);
998 if (bufchain_size(&stdout_data) > 0) {
999 /* If we have data for stdout, try to write to stdout. */
1000 FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
1003 if (bufchain_size(&stderr_data) > 0) {
1004 /* If we have data for stderr, try to write to stderr. */
1005 FD_SET_MAX(STDERR_FILENO, maxfd, wset);
1008 /* Count the currently active fds. */
1010 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
1011 fd = next_fd(&fdstate, &rwx)) i++;
1013 /* Expand the fdlist buffer if necessary. */
1016 fdlist = sresize(fdlist, fdsize, int);
1020 * Add all currently open fds to the select sets, and store
1021 * them in fdlist as well.
1024 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
1025 fd = next_fd(&fdstate, &rwx)) {
1026 fdlist[fdcount++] = fd;
1028 FD_SET_MAX(fd, maxfd, rset);
1030 FD_SET_MAX(fd, maxfd, wset);
1032 FD_SET_MAX(fd, maxfd, xset);
1036 unsigned long next, then;
1038 struct timeval tv, *ptv;
1040 if (run_timers(now, &next)) {
1042 now = GETTICKCOUNT();
1043 if (now - then > next - then)
1047 tv.tv_sec = ticks / 1000;
1048 tv.tv_usec = ticks % 1000 * 1000;
1053 ret = select(maxfd, &rset, &wset, &xset, ptv);
1057 now = GETTICKCOUNT();
1058 } while (ret < 0 && errno == EINTR);
1065 for (i = 0; i < fdcount; i++) {
1068 * We must process exceptional notifications before
1069 * ordinary readability ones, or we may go straight
1070 * past the urgent marker.
1072 if (FD_ISSET(fd, &xset))
1073 select_result(fd, 4);
1074 if (FD_ISSET(fd, &rset))
1075 select_result(fd, 1);
1076 if (FD_ISSET(fd, &wset))
1077 select_result(fd, 2);
1080 if (FD_ISSET(signalpipe[0], &rset)) {
1082 struct winsize size;
1083 if (read(signalpipe[0], c, 1) <= 0)
1085 /* ignore its value; it'll be `x' */
1086 if (ioctl(STDIN_FILENO, TIOCGWINSZ, (void *)&size) >= 0)
1087 back->size(backhandle, size.ws_col, size.ws_row);
1090 if (FD_ISSET(STDIN_FILENO, &rset)) {
1094 if (connopen && back->connected(backhandle)) {
1095 ret = read(STDIN_FILENO, buf, sizeof(buf));
1097 perror("stdin: read");
1099 } else if (ret == 0) {
1100 back->special(backhandle, TS_EOF);
1101 sending = FALSE; /* send nothing further after this */
1106 back->send(backhandle, buf, ret);
1111 if (FD_ISSET(STDOUT_FILENO, &wset)) {
1112 back->unthrottle(backhandle, try_output(FALSE));
1115 if (FD_ISSET(STDERR_FILENO, &wset)) {
1116 back->unthrottle(backhandle, try_output(TRUE));
1119 net_pending_errors();
1121 if ((!connopen || !back->connected(backhandle)) &&
1122 bufchain_size(&stdout_data) == 0 &&
1123 bufchain_size(&stderr_data) == 0)
1124 break; /* we closed the connection */
1126 exitcode = back->exitcode(backhandle);
1128 fprintf(stderr, "Remote process exit code unavailable\n");
1129 exitcode = 1; /* this is an error condition */
1131 cleanup_exit(exitcode);
1132 return exitcode; /* shouldn't happen, but placates gcc */