static int pty_open_slave(Pty pty)
{
if (pty->slave_fd < 0) {
pty->slave_fd = open(pty->name, O_RDWR);
cloexec(pty->slave_fd);
}
return pty->slave_fd;
}
/*
* Called to set up the serial connection.
*
* Returns an error message, or NULL on success.
*
* Also places the canonical host name into `realhost'. It must be
* freed by the caller.
*/
static const char *serial_init(void *frontend_handle, void **backend_handle,
Conf *conf,
const char *host, int port, char **realhost,
int nodelay, int keepalive)
{
Serial serial;
const char *err;
char *line;
serial = snew(struct serial_backend_data);
*backend_handle = serial;
serial->frontend = frontend_handle;
serial->finished = FALSE;
serial->inbufsize = 0;
bufchain_init(&serial->output_data);
line = conf_get_str(conf, CONF_serline);
{
char *msg = dupprintf("Opening serial device %s", line);
logevent(serial->frontend, msg);
sfree(msg);
}
serial->fd = open(line, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
if (serial->fd < 0)
return "Unable to open serial port";
cloexec(serial->fd);
err = serial_configure(serial, conf);
if (err)
return err;
*realhost = dupstr(line);
if (!serial_by_fd)
serial_by_fd = newtree234(serial_compare_by_fd);
add234(serial_by_fd, serial);
serial_uxsel_setup(serial);
/*
* Specials are always available.
*/
update_specials_menu(serial->frontend);
return NULL;
}
/**
make a server port and bind to localhost on all addresses. AF_INET
*/
static int bind_socket (char *ip, uint16_t port){
struct sockaddr_in name;
/* Create the socket. */
int sock = socket(PF_INET, SOCK_STREAM, 0);//tcp
if (sock < 0){
perror ("socket");
exit (EXIT_FAILURE);
}
socket_tcp_keepalive(sock);
//socket_reuse_addr(sock);
socket_nopipe(sock);
cloexec(sock);
/* Give the socket a name. */
name.sin_family = AF_INET;
name.sin_port = htons(port);
if(ip){
name.sin_addr.s_addr = inet_addr(ip);
}else{
name.sin_addr.s_addr = htonl(INADDR_ANY);
}
int count=0;
while(bind(sock,(struct sockaddr *)&name, sizeof (name))<0){
info_time("errno=%d. port=%d,sock=%d: ",errno,port,sock);
perror ("bind");
sleep(10);
count++;
if(count>100){
error("Failed to bind to port %d\n",port);
close(sock);
sock=-1;
}
}
if(sock!=-1){
info("binded to port %hd at sock %d\n",port,sock);
}
return sock;
}
Socket platform_new_connection(SockAddr addr, char *hostname,
int port, int privport,
int oobinline, int nodelay, int keepalive,
Plug plug, Conf *conf)
{
char *cmd;
static const struct socket_function_table socket_fn_table = {
sk_localproxy_plug,
sk_localproxy_close,
sk_localproxy_write,
sk_localproxy_write_oob,
sk_localproxy_write_eof,
sk_localproxy_flush,
sk_localproxy_set_private_ptr,
sk_localproxy_get_private_ptr,
sk_localproxy_set_frozen,
sk_localproxy_socket_error
};
Local_Proxy_Socket ret;
int to_cmd_pipe[2], from_cmd_pipe[2], pid;
if (conf_get_int(conf, CONF_proxy_type) != PROXY_CMD)
return NULL;
cmd = format_telnet_command(addr, port, conf);
ret = snew(struct Socket_localproxy_tag);
ret->fn = &socket_fn_table;
ret->plug = plug;
ret->error = NULL;
ret->outgoingeof = EOF_NO;
bufchain_init(&ret->pending_input_data);
bufchain_init(&ret->pending_output_data);
/*
* Create the pipes to the proxy command, and spawn the proxy
* command process.
*/
if (pipe(to_cmd_pipe) < 0 ||
pipe(from_cmd_pipe) < 0) {
ret->error = dupprintf("pipe: %s", strerror(errno));
sfree(cmd);
return (Socket)ret;
}
cloexec(to_cmd_pipe[1]);
cloexec(from_cmd_pipe[0]);
pid = fork();
if (pid < 0) {
ret->error = dupprintf("fork: %s", strerror(errno));
sfree(cmd);
return (Socket)ret;
} else if (pid == 0) {
close(0);
close(1);
dup2(to_cmd_pipe[0], 0);
dup2(from_cmd_pipe[1], 1);
close(to_cmd_pipe[0]);
close(from_cmd_pipe[1]);
noncloexec(0);
noncloexec(1);
execl("/bin/sh", "sh", "-c", cmd, (void *)NULL);
_exit(255);
}
sfree(cmd);
close(to_cmd_pipe[0]);
close(from_cmd_pipe[1]);
ret->to_cmd = to_cmd_pipe[1];
ret->from_cmd = from_cmd_pipe[0];
if (!localproxy_by_fromfd)
localproxy_by_fromfd = newtree234(localproxy_fromfd_cmp);
if (!localproxy_by_tofd)
localproxy_by_tofd = newtree234(localproxy_tofd_cmp);
add234(localproxy_by_fromfd, ret);
add234(localproxy_by_tofd, ret);
uxsel_set(ret->from_cmd, 1, localproxy_select_result);
/* We are responsible for this and don't need it any more */
sk_addr_free(addr);
return (Socket) ret;
}
/*
* Pre-initialisation. This is here to get around the fact that GTK
* doesn't like being run in setuid/setgid programs (probably
* sensibly). So before we initialise GTK - and therefore before we
* even process the command line - we check to see if we're running
* set[ug]id. If so, we open our pty master _now_, chown it as
* necessary, and drop privileges. We can always close it again
* later. If we're potentially going to be doing utmp as well, we
* also fork off a utmp helper process and communicate with it by
* means of a pipe; the utmp helper will keep privileges in order
* to clean up utmp when we exit (i.e. when its end of our pipe
* closes).
*/
void pty_pre_init(void)
{
Pty pty;
#ifndef OMIT_UTMP
pid_t pid;
int pipefd[2];
#endif
pty = single_pty = snew(struct pty_tag);
pty->conf = NULL;
bufchain_init(&pty->output_data);
/* set the child signal handler straight away; it needs to be set
* before we ever fork. */
putty_signal(SIGCHLD, sigchld_handler);
pty->master_fd = pty->slave_fd = -1;
#ifndef OMIT_UTMP
pty_stamped_utmp = FALSE;
#endif
if (geteuid() != getuid() || getegid() != getgid()) {
pty_open_master(pty);
#ifndef OMIT_UTMP
/*
* Fork off the utmp helper.
*/
if (pipe(pipefd) < 0) {
perror("pterm: pipe");
exit(1);
}
cloexec(pipefd[0]);
cloexec(pipefd[1]);
pid = fork();
if (pid < 0) {
perror("pterm: fork");
exit(1);
} else if (pid == 0) {
char display[128], buffer[128];
int dlen, ret;
close(pipefd[1]);
/*
* Now sit here until we receive a display name from the
* other end of the pipe, and then stamp utmp. Unstamp utmp
* again, and exit, when the pipe closes.
*/
dlen = 0;
while (1) {
ret = read(pipefd[0], buffer, lenof(buffer));
if (ret <= 0) {
cleanup_utmp();
_exit(0);
} else if (!pty_stamped_utmp) {
if (dlen < lenof(display))
memcpy(display+dlen, buffer,
min(ret, lenof(display)-dlen));
if (buffer[ret-1] == '\0') {
/*
* Now we have a display name. NUL-terminate
* it, and stamp utmp.
*/
display[lenof(display)-1] = '\0';
/*
* Trap as many fatal signals as we can in the
* hope of having the best possible chance to
* clean up utmp before termination. We are
* unfortunately unprotected against SIGKILL,
* but that's life.
*/
putty_signal(SIGHUP, fatal_sig_handler);
putty_signal(SIGINT, fatal_sig_handler);
putty_signal(SIGQUIT, fatal_sig_handler);
putty_signal(SIGILL, fatal_sig_handler);
putty_signal(SIGABRT, fatal_sig_handler);
putty_signal(SIGFPE, fatal_sig_handler);
putty_signal(SIGPIPE, fatal_sig_handler);
putty_signal(SIGALRM, fatal_sig_handler);
putty_signal(SIGTERM, fatal_sig_handler);
putty_signal(SIGSEGV, fatal_sig_handler);
putty_signal(SIGUSR1, fatal_sig_handler);
putty_signal(SIGUSR2, fatal_sig_handler);
#ifdef SIGBUS
putty_signal(SIGBUS, fatal_sig_handler);
#endif
#ifdef SIGPOLL
putty_signal(SIGPOLL, fatal_sig_handler);
#endif
#ifdef SIGPROF
putty_signal(SIGPROF, fatal_sig_handler);
#endif
#ifdef SIGSYS
putty_signal(SIGSYS, fatal_sig_handler);
#endif
#ifdef SIGTRAP
putty_signal(SIGTRAP, fatal_sig_handler);
#endif
#ifdef SIGVTALRM
putty_signal(SIGVTALRM, fatal_sig_handler);
#endif
#ifdef SIGXCPU
putty_signal(SIGXCPU, fatal_sig_handler);
#endif
#ifdef SIGXFSZ
putty_signal(SIGXFSZ, fatal_sig_handler);
#endif
#ifdef SIGIO
putty_signal(SIGIO, fatal_sig_handler);
#endif
setup_utmp(pty->name, display);
}
}
}
} else {
close(pipefd[0]);
pty_utmp_helper_pid = pid;
pty_utmp_helper_pipe = pipefd[1];
}
#endif
}
/* Drop privs. */
{
#ifndef HAVE_NO_SETRESUID
int gid = getgid(), uid = getuid();
int setresgid(gid_t, gid_t, gid_t);
int setresuid(uid_t, uid_t, uid_t);
if (setresgid(gid, gid, gid) < 0) {
perror("setresgid");
exit(1);
}
if (setresuid(uid, uid, uid) < 0) {
perror("setresuid");
exit(1);
}
#else
if (setgid(getgid()) < 0) {
perror("setgid");
exit(1);
}
if (setuid(getuid()) < 0) {
perror("setuid");
exit(1);
}
#endif
}
}
static void pty_open_master(Pty pty)
{
#ifdef BSD_PTYS
const char chars1[] = "pqrstuvwxyz";
const char chars2[] = "0123456789abcdef";
const char *p1, *p2;
char master_name[20];
struct group *gp;
for (p1 = chars1; *p1; p1++)
for (p2 = chars2; *p2; p2++) {
sprintf(master_name, "/dev/pty%c%c", *p1, *p2);
pty->master_fd = open(master_name, O_RDWR);
if (pty->master_fd >= 0) {
if (geteuid() == 0 ||
access(master_name, R_OK | W_OK) == 0) {
/*
* We must also check at this point that we are
* able to open the slave side of the pty. We
* wouldn't want to allocate the wrong master,
* get all the way down to forking, and _then_
* find we're unable to open the slave.
*/
strcpy(pty->name, master_name);
pty->name[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
cloexec(pty->master_fd);
if (pty_open_slave(pty) >= 0 &&
access(pty->name, R_OK | W_OK) == 0)
goto got_one;
if (pty->slave_fd > 0)
close(pty->slave_fd);
pty->slave_fd = -1;
}
close(pty->master_fd);
}
}
/* If we get here, we couldn't get a tty at all. */
fprintf(stderr, "pterm: unable to open a pseudo-terminal device\n");
exit(1);
got_one:
/* We need to chown/chmod the /dev/ttyXX device. */
gp = getgrnam("tty");
chown(pty->name, getuid(), gp ? gp->gr_gid : -1);
chmod(pty->name, 0600);
#else
const int flags = O_RDWR
#ifdef O_NOCTTY
| O_NOCTTY
#endif
;
#ifdef HAVE_POSIX_OPENPT
pty->master_fd = posix_openpt(flags);
if (pty->master_fd < 0) {
perror("posix_openpt");
exit(1);
}
#else
pty->master_fd = open("/dev/ptmx", flags);
if (pty->master_fd < 0) {
perror("/dev/ptmx: open");
exit(1);
}
#endif
if (grantpt(pty->master_fd) < 0) {
perror("grantpt");
exit(1);
}
if (unlockpt(pty->master_fd) < 0) {
perror("unlockpt");
exit(1);
}
cloexec(pty->master_fd);
pty->name[FILENAME_MAX-1] = '\0';
strncpy(pty->name, ptsname(pty->master_fd), FILENAME_MAX-1);
#endif
nonblock(pty->master_fd);
if (!ptys_by_fd)
ptys_by_fd = newtree234(pty_compare_by_fd);
add234(ptys_by_fd, pty);
}
int main(int argc, char **argv)
{
bool sending;
int *fdlist;
int fd;
int i, fdstate;
size_t fdsize;
int exitcode;
bool errors;
enum TriState sanitise_stdout = AUTO, sanitise_stderr = AUTO;
bool use_subsystem = false;
bool just_test_share_exists = false;
unsigned long now;
struct winsize size;
const struct BackendVtable *backvt;
fdlist = NULL;
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);
bufchain_sink_init(&stdout_bcs, &stdout_data);
bufchain_sink_init(&stderr_bcs, &stderr_data);
stdout_bs = BinarySink_UPCAST(&stdout_bcs);
stderr_bs = BinarySink_UPCAST(&stderr_bcs);
outgoingeof = EOF_NO;
flags = 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 = false;
{
/*
* Override the default protocol if PLINK_PROTOCOL is set.
*/
char *p = getenv("PLINK_PROTOCOL");
if (p) {
const struct BackendVtable *vt = backend_vt_from_name(p);
if (vt) {
default_protocol = vt->protocol;
default_port = vt->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 = true;
} else if (ret == 2) {
--argc, ++argv;
} else if (ret == 1) {
continue;
} else if (!strcmp(p, "-batch")) {
console_batch_mode = true;
} else if (!strcmp(p, "-s")) {
/* Save status to write to conf later. */
use_subsystem = true;
} 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 = true;
} else {
--argc;
/* Explicitly pass "plink" in place of appname for
* error reporting purposes. appname will have been
* set by be_foo.c to something more generic, probably
* "PuTTY". */
provide_xrm_string(*++argv, "plink");
}
} 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 (!strcmp(p, "-sanitise-stdout") ||
!strcmp(p, "-sanitize-stdout")) {
sanitise_stdout = FORCE_ON;
} else if (!strcmp(p, "-no-sanitise-stdout") ||
!strcmp(p, "-no-sanitize-stdout")) {
sanitise_stdout = FORCE_OFF;
} else if (!strcmp(p, "-sanitise-stderr") ||
!strcmp(p, "-sanitize-stderr")) {
sanitise_stderr = FORCE_ON;
} else if (!strcmp(p, "-no-sanitise-stderr") ||
!strcmp(p, "-no-sanitize-stderr")) {
sanitise_stderr = FORCE_OFF;
} else if (!strcmp(p, "-no-antispoof")) {
console_antispoof_prompt = false;
} else if (*p != '-') {
strbuf *cmdbuf = strbuf_new();
while (argc > 0) {
if (cmdbuf->len > 0)
put_byte(cmdbuf, ' '); /* add space separator */
put_datapl(cmdbuf, ptrlen_from_asciz(p));
if (--argc > 0)
p = *++argv;
}
conf_set_str(conf, CONF_remote_cmd, cmdbuf->s);
conf_set_str(conf, CONF_remote_cmd2, "");
conf_set_bool(conf, CONF_nopty, true); /* command => no tty */
strbuf_free(cmdbuf);
break; /* done with cmdline */
} else {
fprintf(stderr, "plink: unknown option \"%s\"\n", p);
errors = true;
}
}
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_bool(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.
*/
backvt = backend_vt_from_proto(conf_get_int(conf, CONF_protocol));
if (!backvt) {
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);
}
/*
* Decide whether to sanitise control sequences out of standard
* output and standard error.
*
* If we weren't given a command-line override, we do this if (a)
* the fd in question is pointing at a terminal, and (b) we aren't
* trying to allocate a terminal as part of the session.
*
* (Rationale: the risk of control sequences is that they cause
* confusion when sent to a local terminal, so if there isn't one,
* no problem. Also, if we allocate a remote terminal, then we
* sent a terminal type, i.e. we told it what kind of escape
* sequences we _like_, i.e. we were expecting to receive some.)
*/
if (sanitise_stdout == FORCE_ON ||
(sanitise_stdout == AUTO && isatty(STDOUT_FILENO) &&
conf_get_bool(conf, CONF_nopty))) {
stdout_scc = stripctrl_new(stdout_bs, true, L'\0');
stdout_bs = BinarySink_UPCAST(stdout_scc);
}
if (sanitise_stderr == FORCE_ON ||
(sanitise_stderr == AUTO && isatty(STDERR_FILENO) &&
conf_get_bool(conf, CONF_nopty))) {
stderr_scc = stripctrl_new(stderr_bs, true, L'\0');
stderr_bs = BinarySink_UPCAST(stderr_scc);
}
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_bool(conf, CONF_x11_forward) &&
!conf_get_bool(conf, CONF_agentfwd) &&
!conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
conf_set_bool(conf, CONF_ssh_simple, true);
if (just_test_share_exists) {
if (!backvt->test_for_upstream) {
fprintf(stderr, "Connection sharing not supported for connection "
"type '%s'\n", backvt->name);
return 1;
}
if (backvt->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(default_logpolicy, conf);
{
const char *error;
char *realhost;
/* nodelay is only useful if stdin is a terminal device */
bool nodelay = conf_get_bool(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 = backend_init(backvt, plink_seat, &backend, logctx, conf,
conf_get_str(conf, CONF_host),
conf_get_int(conf, CONF_port),
&realhost, nodelay,
conf_get_bool(conf, CONF_tcp_keepalives));
if (error) {
fprintf(stderr, "Unable to open connection:\n%s\n", error);
return 1;
}
ldisc_create(conf, NULL, backend, plink_seat);
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);
seat_echoedit_update(plink_seat, 1, 1);
sending = false;
now = GETTICKCOUNT();
pollwrapper *pw = pollwrap_new();
while (1) {
int rwx;
int ret;
unsigned long next;
pollwrap_clear(pw);
pollwrap_add_fd_rwx(pw, signalpipe[0], SELECT_R);
if (!sending &&
backend_connected(backend) &&
backend_sendok(backend) &&
backend_sendbuffer(backend) < MAX_STDIN_BACKLOG) {
/* If we're OK to send, then try to read from stdin. */
pollwrap_add_fd_rwx(pw, STDIN_FILENO, SELECT_R);
}
if (bufchain_size(&stdout_data) > 0) {
/* If we have data for stdout, try to write to stdout. */
pollwrap_add_fd_rwx(pw, STDOUT_FILENO, SELECT_W);
}
if (bufchain_size(&stderr_data) > 0) {
/* If we have data for stderr, try to write to stderr. */
pollwrap_add_fd_rwx(pw, STDERR_FILENO, SELECT_W);
}
/* 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. */
sgrowarray(fdlist, fdsize, i);
/*
* Add all currently open fds to pw, and store them in fdlist
* as well.
*/
int fdcount = 0;
for (fd = first_fd(&fdstate, &rwx); fd >= 0;
fd = next_fd(&fdstate, &rwx)) {
fdlist[fdcount++] = fd;
pollwrap_add_fd_rwx(pw, fd, rwx);
}
if (toplevel_callback_pending()) {
ret = pollwrap_poll_instant(pw);
} else if (run_timers(now, &next)) {
do {
unsigned long then;
long ticks;
then = now;
now = GETTICKCOUNT();
if (now - then > next - then)
ticks = 0;
else
ticks = next - now;
bool overflow = false;
if (ticks > INT_MAX) {
ticks = INT_MAX;
overflow = true;
}
ret = pollwrap_poll_timeout(pw, ticks);
if (ret == 0 && !overflow)
now = next;
else
now = GETTICKCOUNT();
} while (ret < 0 && errno == EINTR);
} else {
ret = pollwrap_poll_endless(pw);
}
if (ret < 0 && errno == EINTR)
continue;
if (ret < 0) {
perror("poll");
exit(1);
}
for (i = 0; i < fdcount; i++) {
fd = fdlist[i];
int rwx = pollwrap_get_fd_rwx(pw, fd);
/*
* We must process exceptional notifications before
* ordinary readability ones, or we may go straight
* past the urgent marker.
*/
if (rwx & SELECT_X)
select_result(fd, SELECT_X);
if (rwx & SELECT_R)
select_result(fd, SELECT_R);
if (rwx & SELECT_W)
select_result(fd, SELECT_W);
}
if (pollwrap_check_fd_rwx(pw, signalpipe[0], SELECT_R)) {
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)
backend_size(backend, size.ws_col, size.ws_row);
}
if (pollwrap_check_fd_rwx(pw, STDIN_FILENO, SELECT_R)) {
char buf[4096];
int ret;
if (backend_connected(backend)) {
ret = read(STDIN_FILENO, buf, sizeof(buf));
noise_ultralight(NOISE_SOURCE_IOLEN, ret);
if (ret < 0) {
perror("stdin: read");
exit(1);
} else if (ret == 0) {
backend_special(backend, SS_EOF, 0);
sending = false; /* send nothing further after this */
} else {
if (local_tty)
from_tty(buf, ret);
else
backend_send(backend, buf, ret);
}
}
}
if (pollwrap_check_fd_rwx(pw, STDOUT_FILENO, SELECT_W)) {
backend_unthrottle(backend, try_output(false));
}
if (pollwrap_check_fd_rwx(pw, STDERR_FILENO, SELECT_W)) {
backend_unthrottle(backend, try_output(true));
}
run_toplevel_callbacks();
if (!backend_connected(backend) &&
bufchain_size(&stdout_data) == 0 &&
bufchain_size(&stderr_data) == 0)
break; /* we closed the connection */
}
exitcode = backend_exitcode(backend);
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 */
}
/**
* Pipe data through an external executable.
* @param stream the stream filter object.
* @param path path to the executable.
*/
static int Open (stream_t *stream, const char *path)
{
stream_sys_t *p_sys = stream->p_sys = malloc (sizeof (*p_sys));
if (p_sys == NULL)
return VLC_ENOMEM;
stream->pf_read = Read;
stream->pf_peek = Peek;
stream->pf_control = Control;
p_sys->peeked = NULL;
p_sys->offset = 0;
p_sys->pid = -1;
/* I am not a big fan of the pyramid style, but I cannot think of anything
* better here. There are too many failure cases. */
int ret = VLC_EGENERIC;
int comp[2];
/* We use two pipes rather than one stream socket pair, so that we can
* use vmsplice() on Linux. */
if (pipe (comp) == 0)
{
cloexec (comp[1]);
p_sys->write_fd = comp[1];
int uncomp[2];
if (pipe (uncomp) == 0)
{
cloexec (uncomp[0]);
p_sys->read_fd = uncomp[0];
#if (_POSIX_SPAWN >= 0)
posix_spawn_file_actions_t actions;
if (posix_spawn_file_actions_init (&actions) == 0)
{
char *const argv[] = { (char *)path, NULL };
if (!posix_spawn_file_actions_adddup2 (&actions, comp[0], 0)
&& !posix_spawn_file_actions_addclose (&actions, comp[0])
&& !posix_spawn_file_actions_adddup2 (&actions, uncomp[1], 1)
&& !posix_spawn_file_actions_addclose (&actions, uncomp[1])
&& !posix_spawnp (&p_sys->pid, path, &actions, NULL, argv,
environ))
{
if (vlc_clone (&p_sys->thread, Thread, stream,
VLC_THREAD_PRIORITY_INPUT) == 0)
ret = VLC_SUCCESS;
}
else
{
msg_Err (stream, "Cannot execute %s", path);
p_sys->pid = -1;
}
posix_spawn_file_actions_destroy (&actions);
}
#else /* _POSIX_SPAWN */
switch (p_sys->pid = fork ())
{
case -1:
msg_Err (stream, "Cannot fork (%m)");
break;
case 0:
dup2 (comp[0], 0);
close (comp[0]);
dup2 (uncomp[1], 1);
close (uncomp[1]);
execlp (path, path, (char *)NULL);
exit (1); /* if we get, execlp() failed! */
default:
if (vlc_clone (&p_sys->thread, Thread, stream,
VLC_THREAD_PRIORITY_INPUT) == 0)
ret = VLC_SUCCESS;
}
#endif /* _POSIX_SPAWN < 0 */
close (uncomp[1]);
if (ret != VLC_SUCCESS)
close (uncomp[0]);
}
close (comp[0]);
if (ret != VLC_SUCCESS)
{
close (comp[1]);
if (p_sys->pid != -1)
while (waitpid (p_sys->pid, &(int){ 0 }, 0) == -1);
Socket platform_new_connection(SockAddr addr, const char *hostname,
int port, int privport,
int oobinline, int nodelay, int keepalive,
Plug plug, Conf *conf)
{
char *cmd;
static const struct socket_function_table socket_fn_table = {
sk_localproxy_plug,
sk_localproxy_close,
sk_localproxy_write,
sk_localproxy_write_oob,
sk_localproxy_write_eof,
sk_localproxy_flush,
sk_localproxy_set_frozen,
sk_localproxy_socket_error,
NULL, /* peer_info */
};
Local_Proxy_Socket ret;
int to_cmd_pipe[2], from_cmd_pipe[2], cmd_err_pipe[2], pid, proxytype;
proxytype = conf_get_int(conf, CONF_proxy_type);
if (proxytype != PROXY_CMD && proxytype != PROXY_FUZZ)
return NULL;
ret = snew(struct Socket_localproxy_tag);
ret->fn = &socket_fn_table;
ret->plug = plug;
ret->error = NULL;
ret->outgoingeof = EOF_NO;
bufchain_init(&ret->pending_input_data);
bufchain_init(&ret->pending_output_data);
bufchain_init(&ret->pending_error_data);
if (proxytype == PROXY_CMD) {
cmd = format_telnet_command(addr, port, conf);
if (flags & FLAG_STDERR) {
/* If we have a sensible stderr, the proxy command can
* send its own standard error there, so we won't
* interfere. */
cmd_err_pipe[0] = cmd_err_pipe[1] = -1;
} else {
/* If we don't have a sensible stderr, we should catch the
* proxy command's standard error to put in our event
* log. */
cmd_err_pipe[0] = cmd_err_pipe[1] = 0;
}
{
char *logmsg = dupprintf("Starting local proxy command: %s", cmd);
plug_log(plug, 2, NULL, 0, logmsg, 0);
sfree(logmsg);
}
/*
* Create the pipes to the proxy command, and spawn the proxy
* command process.
*/
if (pipe(to_cmd_pipe) < 0 ||
pipe(from_cmd_pipe) < 0 ||
(cmd_err_pipe[0] == 0 && pipe(cmd_err_pipe) < 0)) {
ret->error = dupprintf("pipe: %s", strerror(errno));
sfree(cmd);
return (Socket)ret;
}
cloexec(to_cmd_pipe[1]);
cloexec(from_cmd_pipe[0]);
if (cmd_err_pipe[0] >= 0)
cloexec(cmd_err_pipe[0]);
pid = fork();
if (pid < 0) {
ret->error = dupprintf("fork: %s", strerror(errno));
sfree(cmd);
return (Socket)ret;
} else if (pid == 0) {
close(0);
close(1);
dup2(to_cmd_pipe[0], 0);
dup2(from_cmd_pipe[1], 1);
close(to_cmd_pipe[0]);
close(from_cmd_pipe[1]);
if (cmd_err_pipe[0] >= 0) {
dup2(cmd_err_pipe[1], 2);
close(cmd_err_pipe[1]);
}
noncloexec(0);
noncloexec(1);
execl("/bin/sh", "sh", "-c", cmd, (void *)NULL);
_exit(255);
}
sfree(cmd);
close(to_cmd_pipe[0]);
close(from_cmd_pipe[1]);
if (cmd_err_pipe[0] >= 0)
close(cmd_err_pipe[1]);
ret->to_cmd = to_cmd_pipe[1];
ret->from_cmd = from_cmd_pipe[0];
ret->cmd_err = cmd_err_pipe[0];
} else {
cmd = format_telnet_command(addr, port, conf);
ret->to_cmd = open("/dev/null", O_WRONLY);
if (ret->to_cmd == -1) {
ret->error = dupprintf("/dev/null: %s", strerror(errno));
sfree(cmd);
return (Socket)ret;
}
ret->from_cmd = open(cmd, O_RDONLY);
if (ret->from_cmd == -1) {
ret->error = dupprintf("%s: %s", cmd, strerror(errno));
sfree(cmd);
return (Socket)ret;
}
sfree(cmd);
ret->cmd_err = -1;
}
if (!localproxy_by_fromfd)
localproxy_by_fromfd = newtree234(localproxy_fromfd_cmp);
if (!localproxy_by_tofd)
localproxy_by_tofd = newtree234(localproxy_tofd_cmp);
if (!localproxy_by_errfd)
localproxy_by_errfd = newtree234(localproxy_errfd_cmp);
add234(localproxy_by_fromfd, ret);
add234(localproxy_by_tofd, ret);
if (ret->cmd_err >= 0)
add234(localproxy_by_errfd, ret);
uxsel_set(ret->from_cmd, 1, localproxy_select_result);
if (ret->cmd_err >= 0)
uxsel_set(ret->cmd_err, 1, localproxy_select_result);
/* We are responsible for this and don't need it any more */
sk_addr_free(addr);
return (Socket) ret;
}
int platform_make_x11_server(Plug *plug, const char *progname, int mindisp,
const char *screen_number_suffix,
ptrlen authproto, ptrlen authdata,
Socket **sockets, Conf *conf)
{
char *tmpdir;
char *authfilename = NULL;
strbuf *authfiledata = NULL;
char *unix_path = NULL;
SockAddr *a_tcp = NULL, *a_unix = NULL;
int authfd;
FILE *authfp;
int displayno;
authfiledata = strbuf_new_nm();
int nsockets = 0;
/*
* Look for a free TCP port to run our server on.
*/
for (displayno = mindisp;; displayno++) {
const char *err;
int tcp_port = displayno + 6000;
int addrtype = ADDRTYPE_IPV4;
sockets[nsockets] = new_listener(
NULL, tcp_port, plug, false, conf, addrtype);
err = sk_socket_error(sockets[nsockets]);
if (!err) {
char *hostname = get_hostname();
if (hostname) {
char *canonicalname = NULL;
a_tcp = name_lookup(hostname, tcp_port, &canonicalname,
conf, addrtype, NULL, "");
sfree(canonicalname);
}
sfree(hostname);
nsockets++;
break; /* success! */
} else {
sk_close(sockets[nsockets]);
}
if (!strcmp(err, strerror(EADDRINUSE))) /* yuck! */
goto out;
}
if (a_tcp) {
x11_format_auth_for_authfile(
BinarySink_UPCAST(authfiledata),
a_tcp, displayno, authproto, authdata);
}
/*
* Try to establish the Unix-domain analogue. That may or may not
* work - file permissions in /tmp may prevent it, for example -
* but it's worth a try, and we don't consider it a fatal error if
* it doesn't work.
*/
unix_path = dupprintf("/tmp/.X11-unix/X%d", displayno);
a_unix = unix_sock_addr(unix_path);
sockets[nsockets] = new_unix_listener(a_unix, plug);
if (!sk_socket_error(sockets[nsockets])) {
x11_format_auth_for_authfile(
BinarySink_UPCAST(authfiledata),
a_unix, displayno, authproto, authdata);
nsockets++;
} else {
sk_close(sockets[nsockets]);
sfree(unix_path);
unix_path = NULL;
}
/*
* Decide where the authority data will be written.
*/
tmpdir = getenv("TMPDIR");
if (!tmpdir || !*tmpdir)
tmpdir = "/tmp";
authfilename = dupcat(tmpdir, "/", progname, "-Xauthority-XXXXXX", NULL);
{
int oldumask = umask(077);
authfd = mkstemp(authfilename);
umask(oldumask);
}
if (authfd < 0) {
while (nsockets-- > 0)
sk_close(sockets[nsockets]);
goto out;
}
/*
* Spawn a subprocess which will try to reliably delete our
* auth file when we terminate, in case we die unexpectedly.
*/
{
int cleanup_pipe[2];
pid_t pid;
/* Don't worry if pipe or fork fails; it's not _that_ critical. */
if (!pipe(cleanup_pipe)) {
if ((pid = fork()) == 0) {
int buf[1024];
/*
* Our parent process holds the writing end of
* this pipe, and writes nothing to it. Hence,
* we expect read() to return EOF as soon as
* that process terminates.
*/
close(0);
close(1);
close(2);
setpgid(0, 0);
close(cleanup_pipe[1]);
close(authfd);
while (read(cleanup_pipe[0], buf, sizeof(buf)) > 0);
unlink(authfilename);
if (unix_path)
unlink(unix_path);
_exit(0);
} else if (pid < 0) {
close(cleanup_pipe[0]);
close(cleanup_pipe[1]);
} else {
close(cleanup_pipe[0]);
cloexec(cleanup_pipe[1]);
}
}
}
authfp = fdopen(authfd, "wb");
fwrite(authfiledata->u, 1, authfiledata->len, authfp);
fclose(authfp);
{
char *display = dupprintf(":%d%s", displayno, screen_number_suffix);
conf_set_str_str(conf, CONF_environmt, "DISPLAY", display);
sfree(display);
}
conf_set_str_str(conf, CONF_environmt, "XAUTHORITY", authfilename);
/*
* FIXME: return at least the DISPLAY and XAUTHORITY env settings,
* and perhaps also the display number
*/
out:
if (a_tcp)
sk_addr_free(a_tcp);
/* a_unix doesn't need freeing, because new_unix_listener took it over */
sfree(authfilename);
strbuf_free(authfiledata);
sfree(unix_path);
return nsockets;
}
