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putty-source/unix/uxser.c
Simon Tatham ad0c502cef Refactor the LogContext type. 
LogContext is now the owner of the logevent() function that back ends
and so forth are constantly calling. Previously, logevent was owned by
the Frontend, which would store the message into its list for the GUI
Event Log dialog (or print it to standard error, or whatever) and then
pass it _back_ to LogContext to write to the currently open log file.
Now it's the other way round: LogContext gets the message from the
back end first, writes it to its log file if it feels so inclined, and
communicates it back to the front end.

This means that lots of parts of the back end system no longer need to
have a pointer to a full-on Frontend; the only thing they needed it
for was logging, so now they just have a LogContext (which many of
them had to have anyway, e.g. for logging SSH packets or session
traffic).

LogContext itself also doesn't get a full Frontend pointer any more:
it now talks back to the front end via a little vtable of its own
called LogPolicy, which contains the method that passes Event Log
entries through, the old askappend() function that decides whether to
truncate a pre-existing log file, and an emergency function for
printing an especially prominent message if the log file can't be
created. One minor nice effect of this is that console and GUI apps
can implement that last function subtly differently, so that Unix
console apps can write it with a plain \n instead of the \r\n
(harmless but inelegant) that the old centralised implementation
generated.

One other consequence of this is that the LogContext has to be
provided to backend_init() so that it's available to backends from the
instant of creation, rather than being provided via a separate API
call a couple of function calls later, because backends have typically
started doing things that need logging (like making network
connections) before the call to backend_provide_logctx. Fortunately,
there's no case in the whole code base where we don't already have
logctx by the time we make a backend (so I don't actually remember why
I ever delayed providing one). So that shortens the backend API by one
function, which is always nice.

While I'm tidying up, I've also moved the printf-style logeventf() and
the handy logevent_and_free() into logging.c, instead of having copies
of them scattered around other places. This has also let me remove
some stub functions from a couple of outlying applications like
Pageant. Finally, I've removed the pointless "_tag" at the end of
LogContext's official struct name.
2018-10-10 21:50:50 +01:00

581 lines
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/*
* Serial back end (Unix-specific).
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include "putty.h"
#include "tree234.h"
#define SERIAL_MAX_BACKLOG 4096
typedef struct Serial Serial;
struct Serial {
Frontend *frontend;
LogContext *logctx;
int fd;
int finished;
int inbufsize;
bufchain output_data;
Backend backend;
};
/*
* We store our serial backends in a tree sorted by fd, so that
* when we get an uxsel notification we know which backend instance
* is the owner of the serial port that caused it.
*/
static int serial_compare_by_fd(void *av, void *bv)
{
Serial *a = (Serial *)av;
Serial *b = (Serial *)bv;
if (a->fd < b->fd)
return -1;
else if (a->fd > b->fd)
return +1;
return 0;
}
static int serial_find_by_fd(void *av, void *bv)
{
int a = *(int *)av;
Serial *b = (Serial *)bv;
if (a < b->fd)
return -1;
else if (a > b->fd)
return +1;
return 0;
}
static tree234 *serial_by_fd = NULL;
static void serial_select_result(int fd, int event);
static void serial_uxsel_setup(Serial *serial);
static void serial_try_write(Serial *serial);
static const char *serial_configure(Serial *serial, Conf *conf)
{
struct termios options;
int bflag, bval, speed, flow, parity;
const char *str;
if (serial->fd < 0)
return "Unable to reconfigure already-closed serial connection";
tcgetattr(serial->fd, &options);
/*
* Find the appropriate baud rate flag.
*/
speed = conf_get_int(conf, CONF_serspeed);
#define SETBAUD(x) (bflag = B ## x, bval = x)
#define CHECKBAUD(x) do { if (speed >= x) SETBAUD(x); } while (0)
SETBAUD(50);
#ifdef B75
CHECKBAUD(75);
#endif
#ifdef B110
CHECKBAUD(110);
#endif
#ifdef B134
CHECKBAUD(134);
#endif
#ifdef B150
CHECKBAUD(150);
#endif
#ifdef B200
CHECKBAUD(200);
#endif
#ifdef B300
CHECKBAUD(300);
#endif
#ifdef B600
CHECKBAUD(600);
#endif
#ifdef B1200
CHECKBAUD(1200);
#endif
#ifdef B1800
CHECKBAUD(1800);
#endif
#ifdef B2400
CHECKBAUD(2400);
#endif
#ifdef B4800
CHECKBAUD(4800);
#endif
#ifdef B9600
CHECKBAUD(9600);
#endif
#ifdef B19200
CHECKBAUD(19200);
#endif
#ifdef B38400
CHECKBAUD(38400);
#endif
#ifdef B57600
CHECKBAUD(57600);
#endif
#ifdef B76800
CHECKBAUD(76800);
#endif
#ifdef B115200
CHECKBAUD(115200);
#endif
#ifdef B153600
CHECKBAUD(153600);
#endif
#ifdef B230400
CHECKBAUD(230400);
#endif
#ifdef B307200
CHECKBAUD(307200);
#endif
#ifdef B460800
CHECKBAUD(460800);
#endif
#ifdef B500000
CHECKBAUD(500000);
#endif
#ifdef B576000
CHECKBAUD(576000);
#endif
#ifdef B921600
CHECKBAUD(921600);
#endif
#ifdef B1000000
CHECKBAUD(1000000);
#endif
#ifdef B1152000
CHECKBAUD(1152000);
#endif
#ifdef B1500000
CHECKBAUD(1500000);
#endif
#ifdef B2000000
CHECKBAUD(2000000);
#endif
#ifdef B2500000
CHECKBAUD(2500000);
#endif
#ifdef B3000000
CHECKBAUD(3000000);
#endif
#ifdef B3500000
CHECKBAUD(3500000);
#endif
#ifdef B4000000
CHECKBAUD(4000000);
#endif
#undef CHECKBAUD
#undef SETBAUD
cfsetispeed(&options, bflag);
cfsetospeed(&options, bflag);
logeventf(serial->logctx, "Configuring baud rate %d", bval);
options.c_cflag &= ~CSIZE;
switch (conf_get_int(conf, CONF_serdatabits)) {
case 5: options.c_cflag |= CS5; break;
case 6: options.c_cflag |= CS6; break;
case 7: options.c_cflag |= CS7; break;
case 8: options.c_cflag |= CS8; break;
default: return "Invalid number of data bits (need 5, 6, 7 or 8)";
}
logeventf(serial->logctx, "Configuring %d data bits",
conf_get_int(conf, CONF_serdatabits));
if (conf_get_int(conf, CONF_serstopbits) >= 4) {
options.c_cflag |= CSTOPB;
} else {
options.c_cflag &= ~CSTOPB;
}
logeventf(serial->logctx, "Configuring %d stop bits",
(options.c_cflag & CSTOPB ? 2 : 1));
options.c_iflag &= ~(IXON|IXOFF);
#ifdef CRTSCTS
options.c_cflag &= ~CRTSCTS;
#endif
#ifdef CNEW_RTSCTS
options.c_cflag &= ~CNEW_RTSCTS;
#endif
flow = conf_get_int(conf, CONF_serflow);
if (flow == SER_FLOW_XONXOFF) {
options.c_iflag |= IXON | IXOFF;
str = "XON/XOFF";
} else if (flow == SER_FLOW_RTSCTS) {
#ifdef CRTSCTS
options.c_cflag |= CRTSCTS;
#endif
#ifdef CNEW_RTSCTS
options.c_cflag |= CNEW_RTSCTS;
#endif
str = "RTS/CTS";
} else
str = "no";
logeventf(serial->logctx, "Configuring %s flow control", str);
/* Parity */
parity = conf_get_int(conf, CONF_serparity);
if (parity == SER_PAR_ODD) {
options.c_cflag |= PARENB;
options.c_cflag |= PARODD;
str = "odd";
} else if (parity == SER_PAR_EVEN) {
options.c_cflag |= PARENB;
options.c_cflag &= ~PARODD;
str = "even";
} else {
options.c_cflag &= ~PARENB;
str = "no";
}
logeventf(serial->logctx, "Configuring %s parity", str);
options.c_cflag |= CLOCAL | CREAD;
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
options.c_iflag &= ~(ISTRIP | IGNCR | INLCR | ICRNL
#ifdef IUCLC
| IUCLC
#endif
);
options.c_oflag &= ~(OPOST
#ifdef ONLCR
| ONLCR
#endif
#ifdef OCRNL
| OCRNL
#endif
#ifdef ONOCR
| ONOCR
#endif
#ifdef ONLRET
| ONLRET
#endif
);
options.c_cc[VMIN] = 1;
options.c_cc[VTIME] = 0;
if (tcsetattr(serial->fd, TCSANOW, &options) < 0)
return "Unable to configure serial port";
return NULL;
}
/*
* 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(Frontend *frontend, Backend **backend_handle,
LogContext *logctx, Conf *conf,
const char *host, int port, char **realhost,
int nodelay, int keepalive)
{
Serial *serial;
const char *err;
char *line;
serial = snew(Serial);
serial->backend.vt = &serial_backend;
*backend_handle = &serial->backend;
serial->frontend = frontend;
serial->logctx = logctx;
serial->finished = FALSE;
serial->inbufsize = 0;
bufchain_init(&serial->output_data);
line = conf_get_str(conf, CONF_serline);
logeventf(serial->logctx, "Opening serial device %s", line);
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;
}
static void serial_close(Serial *serial)
{
if (serial->fd >= 0) {
close(serial->fd);
serial->fd = -1;
}
}
static void serial_free(Backend *be)
{
Serial *serial = container_of(be, Serial, backend);
serial_close(serial);
bufchain_clear(&serial->output_data);
sfree(serial);
}
static void serial_reconfig(Backend *be, Conf *conf)
{
Serial *serial = container_of(be, Serial, backend);
/*
* FIXME: what should we do if this returns an error?
*/
serial_configure(serial, conf);
}
static void serial_select_result(int fd, int event)
{
Serial *serial;
char buf[4096];
int ret;
int finished = FALSE;
serial = find234(serial_by_fd, &fd, serial_find_by_fd);
if (!serial)
return; /* spurious event; keep going */
if (event == 1) {
ret = read(serial->fd, buf, sizeof(buf));
if (ret == 0) {
/*
* Shouldn't happen on a real serial port, but I'm open
* to the idea that there might be two-way devices we
* can treat _like_ serial ports which can return EOF.
*/
finished = TRUE;
} else if (ret < 0) {
#ifdef EAGAIN
if (errno == EAGAIN)
return; /* spurious */
#endif
#ifdef EWOULDBLOCK
if (errno == EWOULDBLOCK)
return; /* spurious */
#endif
perror("read serial port");
exit(1);
} else if (ret > 0) {
serial->inbufsize = from_backend(serial->frontend, 0, buf, ret);
serial_uxsel_setup(serial); /* might acquire backlog and freeze */
}
} else if (event == 2) {
/*
* Attempt to send data down the pty.
*/
serial_try_write(serial);
}
if (finished) {
serial_close(serial);
serial->finished = TRUE;
notify_remote_exit(serial->frontend);
}
}
static void serial_uxsel_setup(Serial *serial)
{
int rwx = 0;
if (serial->inbufsize <= SERIAL_MAX_BACKLOG)
rwx |= 1;
if (bufchain_size(&serial->output_data))
rwx |= 2; /* might also want to write to it */
uxsel_set(serial->fd, rwx, serial_select_result);
}
static void serial_try_write(Serial *serial)
{
void *data;
int len, ret;
assert(serial->fd >= 0);
while (bufchain_size(&serial->output_data) > 0) {
bufchain_prefix(&serial->output_data, &data, &len);
ret = write(serial->fd, data, len);
if (ret < 0 && (errno == EWOULDBLOCK)) {
/*
* We've sent all we can for the moment.
*/
break;
}
if (ret < 0) {
perror("write serial port");
exit(1);
}
bufchain_consume(&serial->output_data, ret);
}
serial_uxsel_setup(serial);
}
/*
* Called to send data down the serial connection.
*/
static int serial_send(Backend *be, const char *buf, int len)
{
Serial *serial = container_of(be, Serial, backend);
if (serial->fd < 0)
return 0;
bufchain_add(&serial->output_data, buf, len);
serial_try_write(serial);
return bufchain_size(&serial->output_data);
}
/*
* Called to query the current sendability status.
*/
static int serial_sendbuffer(Backend *be)
{
Serial *serial = container_of(be, Serial, backend);
return bufchain_size(&serial->output_data);
}
/*
* Called to set the size of the window
*/
static void serial_size(Backend *be, int width, int height)
{
/* Do nothing! */
return;
}
/*
* Send serial special codes.
*/
static void serial_special(Backend *be, SessionSpecialCode code, int arg)
{
Serial *serial = container_of(be, Serial, backend);
if (serial->fd >= 0 && code == SS_BRK) {
tcsendbreak(serial->fd, 0);
logevent(serial->logctx, "Sending serial break at user request");
}
return;
}
/*
* Return a list of the special codes that make sense in this
* protocol.
*/
static const SessionSpecial *serial_get_specials(Backend *be)
{
static const struct SessionSpecial specials[] = {
{"Break", SS_BRK},
{NULL, SS_EXITMENU}
};
return specials;
}
static int serial_connected(Backend *be)
{
return 1; /* always connected */
}
static int serial_sendok(Backend *be)
{
return 1;
}
static void serial_unthrottle(Backend *be, int backlog)
{
Serial *serial = container_of(be, Serial, backend);
serial->inbufsize = backlog;
serial_uxsel_setup(serial);
}
static int serial_ldisc(Backend *be, int option)
{
/*
* Local editing and local echo are off by default.
*/
return 0;
}
static void serial_provide_ldisc(Backend *be, Ldisc *ldisc)
{
/* This is a stub. */
}
static int serial_exitcode(Backend *be)
{
Serial *serial = container_of(be, Serial, backend);
if (serial->fd >= 0)
return -1; /* still connected */
else
/* Exit codes are a meaningless concept with serial ports */
return INT_MAX;
}
/*
* cfg_info for Serial does nothing at all.
*/
static int serial_cfg_info(Backend *be)
{
return 0;
}
const struct BackendVtable serial_backend = {
serial_init,
serial_free,
serial_reconfig,
serial_send,
serial_sendbuffer,
serial_size,
serial_special,
serial_get_specials,
serial_connected,
serial_exitcode,
serial_sendok,
serial_ldisc,
serial_provide_ldisc,
serial_unthrottle,
serial_cfg_info,
NULL /* test_for_upstream */,
"serial",
PROT_SERIAL,
0
};
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