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putty-source/unix/uxplink.c
Simon Tatham b9a25510b0 Centralise PuTTY and Plink's non-option argument handling. 
This is another piece of long-overdue refactoring similar to the
recent commit e3796cb77. But where that one dealt with normalisation
of stuff already stored _in_ a Conf by whatever means (including, in
particular, handling a user typing 'username@host.name' into the
Hostname box of the GUI session dialog box), this one deals with
handling argv entries and putting them into the Conf.

This isn't exactly a pure no-functional-change-at-all refactoring. On
the other hand, it isn't a full-on cleanup that completely
rationalises all the user-visible behaviour as well as the code
structure. It's somewhere in between: I've preserved all the behaviour
quirks that I could imagine a reason for having intended, but taken
the opportunity to _not_ faithfully replicate anything I thought was
clearly just a bug.

So, for example, the following inconsistency is carefully preserved:
the command 'plink -load session nextword' treats 'nextword' as a host
name if the loaded session hasn't provided a hostname already, and
otherwise treats 'nextword' as the remote command to execute on the
already-specified remote host, but the same combination of arguments
to GUI PuTTY will _always_ treat 'nextword' as a hostname, overriding
a hostname (if any) in the saved session. That makes some sense to me
because of the different shapes of the overall command lines.

On the other hand, there are two behaviour changes I know of as a
result of this commit: a third argument to GUI PuTTY (after a hostname
and port) now provokes an error message instead of being silently
ignored, and in Plink, if you combine a -P option (specifying a port
number) with the historical comma-separated protocol selection prefix
on the hostname argument (which I'd completely forgotten even existed
until this piece of work), then the -P will now override the selected
protocol's default port number, whereas previously the default port
would win. For example, 'plink -P 12345 telnet,hostname' will now
connect via Telnet to port 12345 instead of to port 23.

There may be scope for removing or rethinking some of the command-
line syntax quirks in the wake of this change. If we do decide to do
anything like that, then hopefully having it all in one place will
make it easier to remove or change things consistently across the
tools.
2017-12-07 20:13:33 +00:00

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/*
* PLink - a command-line (stdin/stdout) variant of PuTTY.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <pwd.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#ifndef HAVE_NO_SYS_SELECT_H
#include <sys/select.h>
#endif
#define PUTTY_DO_GLOBALS /* actually _define_ globals */
#include "putty.h"
#include "storage.h"
#include "tree234.h"
#define MAX_STDIN_BACKLOG 4096
static void *logctx;
static struct termios orig_termios;
void modalfatalbox(const char *p, ...)
{
struct termios cf;
va_list ap;
premsg(&cf);
fprintf(stderr, "FATAL ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
postmsg(&cf);
if (logctx) {
log_free(logctx);
logctx = NULL;
}
cleanup_exit(1);
}
void nonfatal(const char *p, ...)
{
struct termios cf;
va_list ap;
premsg(&cf);
fprintf(stderr, "ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
postmsg(&cf);
}
void connection_fatal(void *frontend, const char *p, ...)
{
struct termios cf;
va_list ap;
premsg(&cf);
fprintf(stderr, "FATAL ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
postmsg(&cf);
if (logctx) {
log_free(logctx);
logctx = NULL;
}
cleanup_exit(1);
}
void cmdline_error(const char *p, ...)
{
struct termios cf;
va_list ap;
premsg(&cf);
fprintf(stderr, "plink: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
postmsg(&cf);
exit(1);
}
static int local_tty = FALSE; /* do we have a local tty? */
static Backend *back;
static void *backhandle;
static Conf *conf;
/*
* Default settings that are specific to Unix plink.
*/
char *platform_default_s(const char *name)
{
if (!strcmp(name, "TermType"))
return dupstr(getenv("TERM"));
if (!strcmp(name, "SerialLine"))
return dupstr("/dev/ttyS0");
return NULL;
}
int platform_default_i(const char *name, int def)
{
return def;
}
FontSpec *platform_default_fontspec(const char *name)
{
return fontspec_new("");
}
Filename *platform_default_filename(const char *name)
{
if (!strcmp(name, "LogFileName"))
return filename_from_str("putty.log");
else
return filename_from_str("");
}
char *x_get_default(const char *key)
{
return NULL; /* this is a stub */
}
int term_ldisc(Terminal *term, int mode)
{
return FALSE;
}
void frontend_echoedit_update(void *frontend, int echo, int edit)
{
/* Update stdin read mode to reflect changes in line discipline. */
struct termios mode;
if (!local_tty) return;
mode = orig_termios;
if (echo)
mode.c_lflag |= ECHO;
else
mode.c_lflag &= ~ECHO;
if (edit) {
mode.c_iflag |= ICRNL;
mode.c_lflag |= ISIG | ICANON;
mode.c_oflag |= OPOST;
} else {
mode.c_iflag &= ~ICRNL;
mode.c_lflag &= ~(ISIG | ICANON);
mode.c_oflag &= ~OPOST;
/* Solaris sets these to unhelpful values */
mode.c_cc[VMIN] = 1;
mode.c_cc[VTIME] = 0;
/* FIXME: perhaps what we do with IXON/IXOFF should be an
* argument to frontend_echoedit_update(), to allow
* implementation of SSH-2 "xon-xoff" and Rlogin's
* equivalent? */
mode.c_iflag &= ~IXON;
mode.c_iflag &= ~IXOFF;
}
/*
* Mark parity errors and (more important) BREAK on input. This
* is more complex than it need be because POSIX-2001 suggests
* that escaping of valid 0xff in the input stream is dependent on
* IGNPAR being clear even though marking of BREAK isn't. NetBSD
* 2.0 goes one worse and makes it dependent on INPCK too. We
* deal with this by forcing these flags into a useful state and
* then faking the state in which we found them in from_tty() if
* we get passed a parity or framing error.
*/
mode.c_iflag = (mode.c_iflag | INPCK | PARMRK) & ~IGNPAR;
tcsetattr(STDIN_FILENO, TCSANOW, &mode);
}
/* Helper function to extract a special character from a termios. */
static char *get_ttychar(struct termios *t, int index)
{
cc_t c = t->c_cc[index];
#if defined(_POSIX_VDISABLE)
if (c == _POSIX_VDISABLE)
return dupstr("");
#endif
return dupprintf("^<%d>", c);
}
char *get_ttymode(void *frontend, const char *mode)
{
/*
* Propagate appropriate terminal modes from the local terminal,
* if any.
*/
if (!local_tty) return NULL;
#define GET_CHAR(ourname, uxname) \
do { \
if (strcmp(mode, ourname) == 0) \
return get_ttychar(&orig_termios, uxname); \
} while(0)
#define GET_BOOL(ourname, uxname, uxmemb, transform) \
do { \
if (strcmp(mode, ourname) == 0) { \
int b = (orig_termios.uxmemb & uxname) != 0; \
transform; \
return dupprintf("%d", b); \
} \
} while (0)
/*
* Modes that want to be the same on all terminal devices involved.
*/
/* All the special characters supported by SSH */
#if defined(VINTR)
GET_CHAR("INTR", VINTR);
#endif
#if defined(VQUIT)
GET_CHAR("QUIT", VQUIT);
#endif
#if defined(VERASE)
GET_CHAR("ERASE", VERASE);
#endif
#if defined(VKILL)
GET_CHAR("KILL", VKILL);
#endif
#if defined(VEOF)
GET_CHAR("EOF", VEOF);
#endif
#if defined(VEOL)
GET_CHAR("EOL", VEOL);
#endif
#if defined(VEOL2)
GET_CHAR("EOL2", VEOL2);
#endif
#if defined(VSTART)
GET_CHAR("START", VSTART);
#endif
#if defined(VSTOP)
GET_CHAR("STOP", VSTOP);
#endif
#if defined(VSUSP)
GET_CHAR("SUSP", VSUSP);
#endif
#if defined(VDSUSP)
GET_CHAR("DSUSP", VDSUSP);
#endif
#if defined(VREPRINT)
GET_CHAR("REPRINT", VREPRINT);
#endif
#if defined(VWERASE)
GET_CHAR("WERASE", VWERASE);
#endif
#if defined(VLNEXT)
GET_CHAR("LNEXT", VLNEXT);
#endif
#if defined(VFLUSH)
GET_CHAR("FLUSH", VFLUSH);
#endif
#if defined(VSWTCH)
GET_CHAR("SWTCH", VSWTCH);
#endif
#if defined(VSTATUS)
GET_CHAR("STATUS", VSTATUS);
#endif
#if defined(VDISCARD)
GET_CHAR("DISCARD", VDISCARD);
#endif
/* Modes that "configure" other major modes. These should probably be
* considered as user preferences. */
/* Configuration of ICANON */
#if defined(ECHOK)
GET_BOOL("ECHOK", ECHOK, c_lflag, );
#endif
#if defined(ECHOKE)
GET_BOOL("ECHOKE", ECHOKE, c_lflag, );
#endif
#if defined(ECHOE)
GET_BOOL("ECHOE", ECHOE, c_lflag, );
#endif
#if defined(ECHONL)
GET_BOOL("ECHONL", ECHONL, c_lflag, );
#endif
#if defined(XCASE)
GET_BOOL("XCASE", XCASE, c_lflag, );
#endif
#if defined(IUTF8)
GET_BOOL("IUTF8", IUTF8, c_iflag, );
#endif
/* Configuration of ECHO */
#if defined(ECHOCTL)
GET_BOOL("ECHOCTL", ECHOCTL, c_lflag, );
#endif
/* Configuration of IXON/IXOFF */
#if defined(IXANY)
GET_BOOL("IXANY", IXANY, c_iflag, );
#endif
/* Configuration of OPOST */
#if defined(OLCUC)
GET_BOOL("OLCUC", OLCUC, c_oflag, );
#endif
#if defined(ONLCR)
GET_BOOL("ONLCR", ONLCR, c_oflag, );
#endif
#if defined(OCRNL)
GET_BOOL("OCRNL", OCRNL, c_oflag, );
#endif
#if defined(ONOCR)
GET_BOOL("ONOCR", ONOCR, c_oflag, );
#endif
#if defined(ONLRET)
GET_BOOL("ONLRET", ONLRET, c_oflag, );
#endif
/*
* Modes that want to be set in only one place, and that we have
* squashed locally.
*/
#if defined(ISIG)
GET_BOOL("ISIG", ISIG, c_lflag, );
#endif
#if defined(ICANON)
GET_BOOL("ICANON", ICANON, c_lflag, );
#endif
#if defined(ECHO)
GET_BOOL("ECHO", ECHO, c_lflag, );
#endif
#if defined(IXON)
GET_BOOL("IXON", IXON, c_iflag, );
#endif
#if defined(IXOFF)
GET_BOOL("IXOFF", IXOFF, c_iflag, );
#endif
#if defined(OPOST)
GET_BOOL("OPOST", OPOST, c_oflag, );
#endif
/*
* We do not propagate the following modes:
* - Parity/serial settings, which are a local affair and don't
* make sense propagated over SSH's 8-bit byte-stream.
* IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
* - Things that want to be enabled in one place that we don't
* squash locally.
* IUCLC
* - Status bits.
* PENDIN
* - Things I don't know what to do with. (FIXME)
* ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
* INLCR IGNCR ICRNL
*/
#undef GET_CHAR
#undef GET_BOOL
/* Fall through to here for unrecognised names, or ones that are
* unsupported on this platform */
return NULL;
}
void cleanup_termios(void)
{
if (local_tty)
tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
}
bufchain stdout_data, stderr_data;
enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
int try_output(int is_stderr)
{
bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
int fd = (is_stderr ? STDERR_FILENO : STDOUT_FILENO);
void *senddata;
int sendlen, ret;
if (bufchain_size(chain) > 0) {
int prev_nonblock = nonblock(fd);
do {
bufchain_prefix(chain, &senddata, &sendlen);
ret = write(fd, senddata, sendlen);
if (ret > 0)
bufchain_consume(chain, ret);
} while (ret == sendlen && bufchain_size(chain) != 0);
if (!prev_nonblock)
no_nonblock(fd);
if (ret < 0 && errno != EAGAIN) {
perror(is_stderr ? "stderr: write" : "stdout: write");
exit(1);
}
}
if (outgoingeof == EOF_PENDING && bufchain_size(&stdout_data) == 0) {
close(STDOUT_FILENO);
outgoingeof = EOF_SENT;
}
return bufchain_size(&stdout_data) + bufchain_size(&stderr_data);
}
int from_backend(void *frontend_handle, int is_stderr,
const char *data, int len)
{
if (is_stderr) {
bufchain_add(&stderr_data, data, len);
return try_output(TRUE);
} else {
assert(outgoingeof == EOF_NO);
bufchain_add(&stdout_data, data, len);
return try_output(FALSE);
}
}
int from_backend_untrusted(void *frontend_handle, const char *data, int len)
{
/*
* No "untrusted" output should get here (the way the code is
* currently, it's all diverted by FLAG_STDERR).
*/
assert(!"Unexpected call to from_backend_untrusted()");
return 0; /* not reached */
}
int from_backend_eof(void *frontend_handle)
{
assert(outgoingeof == EOF_NO);
outgoingeof = EOF_PENDING;
try_output(FALSE);
return FALSE; /* do not respond to incoming EOF with outgoing */
}
int get_userpass_input(prompts_t *p, const unsigned char *in, int inlen)
{
int ret;
ret = cmdline_get_passwd_input(p, in, inlen);
if (ret == -1)
ret = console_get_userpass_input(p, in, inlen);
return ret;
}
/*
* Handle data from a local tty in PARMRK format.
*/
static void from_tty(void *vbuf, unsigned len)
{
char *p, *q, *end, *buf = vbuf;
static enum {NORMAL, FF, FF00} state = NORMAL;
p = buf; end = buf + len;
while (p < end) {
switch (state) {
case NORMAL:
if (*p == '\xff') {
p++;
state = FF;
} else {
q = memchr(p, '\xff', end - p);
if (q == NULL) q = end;
back->send(backhandle, p, q - p);
p = q;
}
break;
case FF:
if (*p == '\xff') {
back->send(backhandle, p, 1);
p++;
state = NORMAL;
} else if (*p == '\0') {
p++;
state = FF00;
} else abort();
break;
case FF00:
if (*p == '\0') {
back->special(backhandle, TS_BRK);
} else {
/*
* Pretend that PARMRK wasn't set. This involves
* faking what INPCK and IGNPAR would have done if
* we hadn't overridden them. Unfortunately, we
* can't do this entirely correctly because INPCK
* distinguishes between framing and parity
* errors, but PARMRK format represents both in
* the same way. We assume that parity errors are
* more common than framing errors, and hence
* treat all input errors as being subject to
* INPCK.
*/
if (orig_termios.c_iflag & INPCK) {
/* If IGNPAR is set, we throw away the character. */
if (!(orig_termios.c_iflag & IGNPAR)) {
/* PE/FE get passed on as NUL. */
*p = 0;
back->send(backhandle, p, 1);
}
} else {
/* INPCK not set. Assume we got a parity error. */
back->send(backhandle, p, 1);
}
}
p++;
state = NORMAL;
}
}
}
int signalpipe[2];
void sigwinch(int signum)
{
if (write(signalpipe[1], "x", 1) <= 0)
/* not much we can do about it */;
}
/*
* In Plink our selects are synchronous, so these functions are
* empty stubs.
*/
uxsel_id *uxsel_input_add(int fd, int rwx) { return NULL; }
void uxsel_input_remove(uxsel_id *id) { }
/*
* Short description of parameters.
*/
static void usage(void)
{
printf("Plink: command-line connection utility\n");
printf("%s\n", ver);
printf("Usage: plink [options] [user@]host [command]\n");
printf(" (\"host\" can also be a PuTTY saved session name)\n");
printf("Options:\n");
printf(" -V print version information and exit\n");
printf(" -pgpfp print PGP key fingerprints and exit\n");
printf(" -v show verbose messages\n");
printf(" -load sessname Load settings from saved session\n");
printf(" -ssh -telnet -rlogin -raw -serial\n");
printf(" force use of a particular protocol\n");
printf(" -P port connect to specified port\n");
printf(" -l user connect with specified username\n");
printf(" -batch disable all interactive prompts\n");
printf(" -proxycmd command\n");
printf(" use 'command' as local proxy\n");
printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
printf(" Specify the serial configuration (serial only)\n");
printf("The following options only apply to SSH connections:\n");
printf(" -pw passw login with specified password\n");
printf(" -D [listen-IP:]listen-port\n");
printf(" Dynamic SOCKS-based port forwarding\n");
printf(" -L [listen-IP:]listen-port:host:port\n");
printf(" Forward local port to remote address\n");
printf(" -R [listen-IP:]listen-port:host:port\n");
printf(" Forward remote port to local address\n");
printf(" -X -x enable / disable X11 forwarding\n");
printf(" -A -a enable / disable agent forwarding\n");
printf(" -t -T enable / disable pty allocation\n");
printf(" -1 -2 force use of particular protocol version\n");
printf(" -4 -6 force use of IPv4 or IPv6\n");
printf(" -C enable compression\n");
printf(" -i key private key file for user authentication\n");
printf(" -noagent disable use of Pageant\n");
printf(" -agent enable use of Pageant\n");
printf(" -noshare disable use of connection sharing\n");
printf(" -share enable use of connection sharing\n");
printf(" -hostkey aa:bb:cc:...\n");
printf(" manually specify a host key (may be repeated)\n");
printf(" -m file read remote command(s) from file\n");
printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
printf(" -N don't start a shell/command (SSH-2 only)\n");
printf(" -nc host:port\n");
printf(" open tunnel in place of session (SSH-2 only)\n");
printf(" -sshlog file\n");
printf(" -sshrawlog file\n");
printf(" log protocol details to a file\n");
printf(" -shareexists\n");
printf(" test whether a connection-sharing upstream exists\n");
exit(1);
}
static void version(void)
{
char *buildinfo_text = buildinfo("\n");
printf("plink: %s\n%s\n", ver, buildinfo_text);
sfree(buildinfo_text);
exit(0);
}
void frontend_net_error_pending(void) {}
const int share_can_be_downstream = TRUE;
const int share_can_be_upstream = TRUE;
const int buildinfo_gtk_relevant = FALSE;
int main(int argc, char **argv)
{
int sending;
int *fdlist;
int fd;
int i, fdcount, fdsize, fdstate;
int exitcode;
int errors;
int use_subsystem = 0;
int just_test_share_exists = FALSE;
unsigned long now;
struct winsize size;
fdlist = NULL;
fdcount = fdsize = 0;
/*
* Initialise port and protocol to sensible defaults. (These
* will be overridden by more or less anything.)
*/
default_protocol = PROT_SSH;
default_port = 22;
bufchain_init(&stdout_data);
bufchain_init(&stderr_data);
outgoingeof = EOF_NO;
flags = FLAG_STDERR | FLAG_STDERR_TTY;
cmdline_tooltype |=
(TOOLTYPE_HOST_ARG |
TOOLTYPE_HOST_ARG_CAN_BE_SESSION |
TOOLTYPE_HOST_ARG_PROTOCOL_PREFIX |
TOOLTYPE_HOST_ARG_FROM_LAUNCHABLE_LOAD);
stderr_tty_init();
/*
* Process the command line.
*/
conf = conf_new();
do_defaults(NULL, conf);
loaded_session = FALSE;
default_protocol = conf_get_int(conf, CONF_protocol);
default_port = conf_get_int(conf, CONF_port);
errors = 0;
{
/*
* Override the default protocol if PLINK_PROTOCOL is set.
*/
char *p = getenv("PLINK_PROTOCOL");
if (p) {
const Backend *b = backend_from_name(p);
if (b) {
default_protocol = b->protocol;
default_port = b->default_port;
conf_set_int(conf, CONF_protocol, default_protocol);
conf_set_int(conf, CONF_port, default_port);
}
}
}
while (--argc) {
char *p = *++argv;
int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
1, conf);
if (ret == -2) {
fprintf(stderr,
"plink: option \"%s\" requires an argument\n", p);
errors = 1;
} else if (ret == 2) {
--argc, ++argv;
} else if (ret == 1) {
continue;
} else if (!strcmp(p, "-batch")) {
console_batch_mode = 1;
} else if (!strcmp(p, "-s")) {
/* Save status to write to conf later. */
use_subsystem = 1;
} else if (!strcmp(p, "-V") || !strcmp(p, "--version")) {
version();
} else if (!strcmp(p, "--help")) {
usage();
exit(0);
} else if (!strcmp(p, "-pgpfp")) {
pgp_fingerprints();
exit(1);
} else if (!strcmp(p, "-o")) {
if (argc <= 1) {
fprintf(stderr,
"plink: option \"-o\" requires an argument\n");
errors = 1;
} else {
--argc;
provide_xrm_string(*++argv);
}
} else if (!strcmp(p, "-shareexists")) {
just_test_share_exists = TRUE;
} else if (!strcmp(p, "-fuzznet")) {
conf_set_int(conf, CONF_proxy_type, PROXY_FUZZ);
conf_set_str(conf, CONF_proxy_telnet_command, "%host");
} else if (*p != '-') {
char *command;
int cmdlen, cmdsize;
cmdlen = cmdsize = 0;
command = NULL;
while (argc) {
while (*p) {
if (cmdlen >= cmdsize) {
cmdsize = cmdlen + 512;
command = sresize(command, cmdsize, char);
}
command[cmdlen++]=*p++;
}
if (cmdlen >= cmdsize) {
cmdsize = cmdlen + 512;
command = sresize(command, cmdsize, char);
}
command[cmdlen++]=' '; /* always add trailing space */
if (--argc) p = *++argv;
}
if (cmdlen) command[--cmdlen]='\0';
/* change trailing blank to NUL */
conf_set_str(conf, CONF_remote_cmd, command);
conf_set_str(conf, CONF_remote_cmd2, "");
conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
break; /* done with cmdline */
} else {
fprintf(stderr, "plink: unknown option \"%s\"\n", p);
errors = 1;
}
}
if (errors)
return 1;
if (!cmdline_host_ok(conf)) {
usage();
}
prepare_session(conf);
/*
* Perform command-line overrides on session configuration.
*/
cmdline_run_saved(conf);
/*
* If we have no better ideas for the remote username, use the local
* one, as 'ssh' does.
*/
if (conf_get_str(conf, CONF_username)[0] == '\0') {
char *user = get_username();
if (user) {
conf_set_str(conf, CONF_username, user);
sfree(user);
}
}
/*
* Apply subsystem status.
*/
if (use_subsystem)
conf_set_int(conf, CONF_ssh_subsys, TRUE);
if (!*conf_get_str(conf, CONF_remote_cmd) &&
!*conf_get_str(conf, CONF_remote_cmd2) &&
!*conf_get_str(conf, CONF_ssh_nc_host))
flags |= FLAG_INTERACTIVE;
/*
* Select protocol. This is farmed out into a table in a
* separate file to enable an ssh-free variant.
*/
back = backend_from_proto(conf_get_int(conf, CONF_protocol));
if (back == NULL) {
fprintf(stderr,
"Internal fault: Unsupported protocol found\n");
return 1;
}
/*
* Block SIGPIPE, so that we'll get EPIPE individually on
* particular network connections that go wrong.
*/
putty_signal(SIGPIPE, SIG_IGN);
/*
* Set up the pipe we'll use to tell us about SIGWINCH.
*/
if (pipe(signalpipe) < 0) {
perror("pipe");
exit(1);
}
/* We don't want the signal handler to block if the pipe's full. */
nonblock(signalpipe[0]);
nonblock(signalpipe[1]);
cloexec(signalpipe[0]);
cloexec(signalpipe[1]);
putty_signal(SIGWINCH, sigwinch);
/*
* Now that we've got the SIGWINCH handler installed, try to find
* out the initial terminal size.
*/
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &size) >= 0) {
conf_set_int(conf, CONF_width, size.ws_col);
conf_set_int(conf, CONF_height, size.ws_row);
}
sk_init();
uxsel_init();
/*
* Plink doesn't provide any way to add forwardings after the
* connection is set up, so if there are none now, we can safely set
* the "simple" flag.
*/
if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
!conf_get_int(conf, CONF_x11_forward) &&
!conf_get_int(conf, CONF_agentfwd) &&
!conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
conf_set_int(conf, CONF_ssh_simple, TRUE);
if (just_test_share_exists) {
if (!back->test_for_upstream) {
fprintf(stderr, "Connection sharing not supported for connection "
"type '%s'\n", back->name);
return 1;
}
if (back->test_for_upstream(conf_get_str(conf, CONF_host),
conf_get_int(conf, CONF_port), conf))
return 0;
else
return 1;
}
/*
* Start up the connection.
*/
logctx = log_init(NULL, conf);
console_provide_logctx(logctx);
{
const char *error;
char *realhost;
/* nodelay is only useful if stdin is a terminal device */
int nodelay = conf_get_int(conf, CONF_tcp_nodelay) && isatty(0);
/* This is a good place for a fuzzer to fork us. */
#ifdef __AFL_HAVE_MANUAL_CONTROL
__AFL_INIT();
#endif
error = back->init(NULL, &backhandle, conf,
conf_get_str(conf, CONF_host),
conf_get_int(conf, CONF_port),
&realhost, nodelay,
conf_get_int(conf, CONF_tcp_keepalives));
if (error) {
fprintf(stderr, "Unable to open connection:\n%s\n", error);
return 1;
}
back->provide_logctx(backhandle, logctx);
ldisc_create(conf, NULL, back, backhandle, NULL);
sfree(realhost);
}
/*
* Set up the initial console mode. We don't care if this call
* fails, because we know we aren't necessarily running in a
* console.
*/
local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
atexit(cleanup_termios);
frontend_echoedit_update(NULL, 1, 1);
sending = FALSE;
now = GETTICKCOUNT();
while (1) {
fd_set rset, wset, xset;
int maxfd;
int rwx;
int ret;
unsigned long next;
FD_ZERO(&rset);
FD_ZERO(&wset);
FD_ZERO(&xset);
maxfd = 0;
FD_SET_MAX(signalpipe[0], maxfd, rset);
if (!sending &&
back->connected(backhandle) &&
back->sendok(backhandle) &&
back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
/* If we're OK to send, then try to read from stdin. */
FD_SET_MAX(STDIN_FILENO, maxfd, rset);
}
if (bufchain_size(&stdout_data) > 0) {
/* If we have data for stdout, try to write to stdout. */
FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
}
if (bufchain_size(&stderr_data) > 0) {
/* If we have data for stderr, try to write to stderr. */
FD_SET_MAX(STDERR_FILENO, maxfd, wset);
}
/* Count the currently active fds. */
i = 0;
for (fd = first_fd(&fdstate, &rwx); fd >= 0;
fd = next_fd(&fdstate, &rwx)) i++;
/* Expand the fdlist buffer if necessary. */
if (i > fdsize) {
fdsize = i + 16;
fdlist = sresize(fdlist, fdsize, int);
}
/*
* Add all currently open fds to the select sets, and store
* them in fdlist as well.
*/
fdcount = 0;
for (fd = first_fd(&fdstate, &rwx); fd >= 0;
fd = next_fd(&fdstate, &rwx)) {
fdlist[fdcount++] = fd;
if (rwx & 1)
FD_SET_MAX(fd, maxfd, rset);
if (rwx & 2)
FD_SET_MAX(fd, maxfd, wset);
if (rwx & 4)
FD_SET_MAX(fd, maxfd, xset);
}
if (toplevel_callback_pending()) {
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
ret = select(maxfd, &rset, &wset, &xset, &tv);
} else if (run_timers(now, &next)) {
do {
unsigned long then;
long ticks;
struct timeval tv;
then = now;
now = GETTICKCOUNT();
if (now - then > next - then)
ticks = 0;
else
ticks = next - now;
tv.tv_sec = ticks / 1000;
tv.tv_usec = ticks % 1000 * 1000;
ret = select(maxfd, &rset, &wset, &xset, &tv);
if (ret == 0)
now = next;
else
now = GETTICKCOUNT();
} while (ret < 0 && errno == EINTR);
} else {
ret = select(maxfd, &rset, &wset, &xset, NULL);
}
if (ret < 0 && errno == EINTR)
continue;
if (ret < 0) {
perror("select");
exit(1);
}
for (i = 0; i < fdcount; i++) {
fd = fdlist[i];
/*
* We must process exceptional notifications before
* ordinary readability ones, or we may go straight
* past the urgent marker.
*/
if (FD_ISSET(fd, &xset))
select_result(fd, 4);
if (FD_ISSET(fd, &rset))
select_result(fd, 1);
if (FD_ISSET(fd, &wset))
select_result(fd, 2);
}
if (FD_ISSET(signalpipe[0], &rset)) {
char c[1];
struct winsize size;
if (read(signalpipe[0], c, 1) <= 0)
/* ignore error */;
/* ignore its value; it'll be `x' */
if (ioctl(STDIN_FILENO, TIOCGWINSZ, (void *)&size) >= 0)
back->size(backhandle, size.ws_col, size.ws_row);
}
if (FD_ISSET(STDIN_FILENO, &rset)) {
char buf[4096];
int ret;
if (back->connected(backhandle)) {
ret = read(STDIN_FILENO, buf, sizeof(buf));
if (ret < 0) {
perror("stdin: read");
exit(1);
} else if (ret == 0) {
back->special(backhandle, TS_EOF);
sending = FALSE; /* send nothing further after this */
} else {
if (local_tty)
from_tty(buf, ret);
else
back->send(backhandle, buf, ret);
}
}
}
if (FD_ISSET(STDOUT_FILENO, &wset)) {
back->unthrottle(backhandle, try_output(FALSE));
}
if (FD_ISSET(STDERR_FILENO, &wset)) {
back->unthrottle(backhandle, try_output(TRUE));
}
run_toplevel_callbacks();
if (!back->connected(backhandle) &&
bufchain_size(&stdout_data) == 0 &&
bufchain_size(&stderr_data) == 0)
break; /* we closed the connection */
}
exitcode = back->exitcode(backhandle);
if (exitcode < 0) {
fprintf(stderr, "Remote process exit code unavailable\n");
exitcode = 1; /* this is an error condition */
}
cleanup_exit(exitcode);
return exitcode; /* shouldn't happen, but placates gcc */
}
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