/* $OpenBSD: lp_stty.c,v 1.1.1.1 2018/04/27 16:14:36 eric Exp $ */

/*
 * Adapted from the following files in src/usr.sbin/lpr/lpd:
 *
 * extern.h,v 1.9 2015/09/29 02:37:29
 * key.c,v 1.8 2015/01/16 06:40:18 
 * modes.c,v 1.8 2015/01/16 06:40:18
 * printjob.c,v 1.58 2016/11/22 16:03:57
 */

static const char *printer;

/*-
 *
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1991, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/ioctl.h>

#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <limits.h>
#include <termios.h>

#include "lp.h"
#include "log.h"

/*
 * from extern.h
 */

struct info {
        int fd;                                 /* file descriptor */
        int ldisc;                              /* line discipline */
        int off;                                /* turn off */
        int set;                                /* need set */
        int wset;                               /* need window set */
        char *arg;                              /* argument */
        struct termios t;                       /* terminal info */
        struct winsize win;                     /* window info */
};


/*
 * from key.c
 */

static int  c_key(const void *, const void *);
static void f_cbreak(struct info *);
static void f_columns(struct info *);
static void f_dec(struct info *);
static void f_extproc(struct info *);
static void f_ispeed(struct info *);
static void f_nl(struct info *);
static void f_ospeed(struct info *);
static void f_raw(struct info *);
static void f_rows(struct info *);
static void f_sane(struct info *);
static void f_tty(struct info *);

static struct key {
        char *name;                             /* name */
        void (*f)(struct info *);               /* function */
#define F_NEEDARG       0x01                    /* needs an argument */
#define F_OFFOK         0x02                    /* can turn off */
        int flags;
} const keys[] = {
        { "cbreak",     f_cbreak,       F_OFFOK },
        { "cols",       f_columns,      F_NEEDARG },
        { "columns",    f_columns,      F_NEEDARG },
        { "cooked",     f_sane,         0 },
        { "dec",        f_dec,          0 },
        { "extproc",    f_extproc,      F_OFFOK },
        { "ispeed",     f_ispeed,       F_NEEDARG },
        { "new",        f_tty,          0 },
        { "nl",         f_nl,           F_OFFOK },
        { "old",        f_tty,          0 },
        { "ospeed",     f_ospeed,       F_NEEDARG },
        { "raw",        f_raw,          F_OFFOK },
        { "rows",       f_rows,         F_NEEDARG },
        { "sane",       f_sane,         0 },
        { "tty",        f_tty,          0 },
};

static int
c_key(const void *a, const void *b)
{

        return (strcmp(((const struct key *)a)->name,
            ((const struct key *)b)->name));
}

static int
ksearch(char ***argvp, struct info *ip)
{
        char *name;
        struct key *kp, tmp;

        name = **argvp;
        if (*name == '-') {
                ip->off = 1;
                ++name;
        } else
                ip->off = 0;

        tmp.name = name;
        if (!(kp = (struct key *)bsearch(&tmp, keys,
            sizeof(keys)/sizeof(struct key), sizeof(struct key), c_key)))
                return (0);
        if (!(kp->flags & F_OFFOK) && ip->off) {
                log_warnx("%s: illegal option: %s", printer, name);
                return (1);
        }
        if (kp->flags & F_NEEDARG && !(ip->arg = *++*argvp)) {
                log_warnx("%s: option requires an argument: %s", printer, name);
                return (1);
        }
        kp->f(ip);
        return (1);
}

static void
f_cbreak(struct info *ip)
{

        if (ip->off)
                f_sane(ip);
        else {
                ip->t.c_iflag |= BRKINT|IXON|IMAXBEL;
                ip->t.c_oflag |= OPOST;
                ip->t.c_lflag |= ISIG|IEXTEN;
                ip->t.c_lflag &= ~ICANON;
                ip->set = 1;
        }
}

static void
f_columns(struct info *ip)
{

        ip->win.ws_col = atoi(ip->arg);
        ip->wset = 1;
}

static void
f_dec(struct info *ip)
{

        ip->t.c_cc[VERASE] = (u_char)0177;
        ip->t.c_cc[VKILL] = CTRL('u');
        ip->t.c_cc[VINTR] = CTRL('c');
        ip->t.c_lflag &= ~ECHOPRT;
        ip->t.c_lflag |= ECHOE|ECHOKE|ECHOCTL;
        ip->t.c_iflag &= ~IXANY;
        ip->set = 1;
}

static void
f_extproc(struct info *ip)
{

        if (ip->set) {
                int tmp = 1;
                (void)ioctl(ip->fd, TIOCEXT, &tmp);
        } else {
                int tmp = 0;
                (void)ioctl(ip->fd, TIOCEXT, &tmp);
        }
}

static void
f_ispeed(struct info *ip)
{

        cfsetispeed(&ip->t, atoi(ip->arg));
        ip->set = 1;
}

static void
f_nl(struct info *ip)
{

        if (ip->off) {
                ip->t.c_iflag |= ICRNL;
                ip->t.c_oflag |= ONLCR;
        } else {
                ip->t.c_iflag &= ~ICRNL;
                ip->t.c_oflag &= ~ONLCR;
        }
        ip->set = 1;
}

static void
f_ospeed(struct info *ip)
{

        cfsetospeed(&ip->t, atoi(ip->arg));
        ip->set = 1;
}

static void
f_raw(struct info *ip)
{

        if (ip->off)
                f_sane(ip);
        else {
                cfmakeraw(&ip->t);
                ip->t.c_cflag &= ~(CSIZE|PARENB);
                ip->t.c_cflag |= CS8;
                ip->set = 1;
        }
}

static void
f_rows(struct info *ip)
{

        ip->win.ws_row = atoi(ip->arg);
        ip->wset = 1;
}

static void
f_sane(struct info *ip)
{

        ip->t.c_cflag = TTYDEF_CFLAG | (ip->t.c_cflag & (CLOCAL|CRTSCTS));
        ip->t.c_iflag = TTYDEF_IFLAG;
        ip->t.c_iflag |= ICRNL;
        /* preserve user-preference flags in lflag */
#define LKEEP   (ECHOKE|ECHOE|ECHOK|ECHOPRT|ECHOCTL|ALTWERASE|TOSTOP|NOFLSH)
        ip->t.c_lflag = TTYDEF_LFLAG | (ip->t.c_lflag & LKEEP);
        ip->t.c_oflag = TTYDEF_OFLAG;
        ip->set = 1;
}

static void
f_tty(struct info *ip)
{
        int tmp;

        tmp = TTYDISC;
        if (ioctl(0, TIOCSETD, &tmp) == -1)
                log_warn("%s: ioctl(TIOCSETD)", printer);
}

/*
 * from key.c
 */

struct modes {
        char *name;
        long set;
        long unset;
};

/*
 * The code in optlist() depends on minus options following regular
 * options, i.e. "foo" must immediately precede "-foo".
 */
const struct modes cmodes[] = {
        { "cs5",        CS5, CSIZE },
        { "cs6",        CS6, CSIZE },
        { "cs7",        CS7, CSIZE },
        { "cs8",        CS8, CSIZE },
        { "cstopb",     CSTOPB, 0 },
        { "-cstopb",    0, CSTOPB },
        { "cread",      CREAD, 0 },
        { "-cread",     0, CREAD },
        { "parenb",     PARENB, 0 },
        { "-parenb",    0, PARENB },
        { "parodd",     PARODD, 0 },
        { "-parodd",    0, PARODD },
        { "parity",     PARENB | CS7, PARODD | CSIZE },
        { "-parity",    CS8, PARODD | PARENB | CSIZE },
        { "evenp",      PARENB | CS7, PARODD | CSIZE },
        { "-evenp",     CS8, PARODD | PARENB | CSIZE },
        { "oddp",       PARENB | CS7 | PARODD, CSIZE },
        { "-oddp",      CS8, PARODD | PARENB | CSIZE },
        { "pass8",      CS8, PARODD | PARENB | CSIZE },
        { "-pass8",     PARENB | CS7, PARODD | CSIZE },
        { "hupcl",      HUPCL, 0 },
        { "-hupcl",     0, HUPCL },
        { "hup",        HUPCL, 0 },
        { "-hup",       0, HUPCL },
        { "clocal",     CLOCAL, 0 },
        { "-clocal",    0, CLOCAL },
        { "crtscts",    CRTSCTS, 0 },
        { "-crtscts",   0, CRTSCTS },
        { "mdmbuf",     MDMBUF, 0 },
        { "-mdmbuf",    0, MDMBUF },
        { NULL },
};

const struct modes imodes[] = {
        { "ignbrk",     IGNBRK, 0 },
        { "-ignbrk",    0, IGNBRK },
        { "brkint",     BRKINT, 0 },
        { "-brkint",    0, BRKINT },
        { "ignpar",     IGNPAR, 0 },
        { "-ignpar",    0, IGNPAR },
        { "parmrk",     PARMRK, 0 },
        { "-parmrk",    0, PARMRK },
        { "inpck",      INPCK, 0 },
        { "-inpck",     0, INPCK },
        { "istrip",     ISTRIP, 0 },
        { "-istrip",    0, ISTRIP },
        { "inlcr",      INLCR, 0 },
        { "-inlcr",     0, INLCR },
        { "igncr",      IGNCR, 0 },
        { "-igncr",     0, IGNCR },
        { "icrnl",      ICRNL, 0 },
        { "-icrnl",     0, ICRNL },
        { "iuclc",      IUCLC, 0 },
        { "-iuclc",     0, IUCLC },
        { "ixon",       IXON, 0 },
        { "-ixon",      0, IXON },
        { "flow",       IXON, 0 },
        { "-flow",      0, IXON },
        { "ixoff",      IXOFF, 0 },
        { "-ixoff",     0, IXOFF },
        { "tandem",     IXOFF, 0 },
        { "-tandem",    0, IXOFF },
        { "ixany",      IXANY, 0 },
        { "-ixany",     0, IXANY },
        { "decctlq",    0, IXANY },
        { "-decctlq",   IXANY, 0 },
        { "imaxbel",    IMAXBEL, 0 },
        { "-imaxbel",   0, IMAXBEL },
        { NULL },
};

const struct modes lmodes[] = {
        { "echo",       ECHO, 0 },
        { "-echo",      0, ECHO },
        { "echoe",      ECHOE, 0 },
        { "-echoe",     0, ECHOE },
        { "crterase",   ECHOE, 0 },
        { "-crterase",  0, ECHOE },
        { "crtbs",      ECHOE, 0 },     /* crtbs not supported, close enough */
        { "-crtbs",     0, ECHOE },
        { "echok",      ECHOK, 0 },
        { "-echok",     0, ECHOK },
        { "echoke",     ECHOKE, 0 },
        { "-echoke",    0, ECHOKE },
        { "crtkill",    ECHOKE, 0 },
        { "-crtkill",   0, ECHOKE },
        { "altwerase",  ALTWERASE, 0 },
        { "-altwerase", 0, ALTWERASE },
        { "iexten",     IEXTEN, 0 },
        { "-iexten",    0, IEXTEN },
        { "echonl",     ECHONL, 0 },
        { "-echonl",    0, ECHONL },
        { "echoctl",    ECHOCTL, 0 },
        { "-echoctl",   0, ECHOCTL },
        { "ctlecho",    ECHOCTL, 0 },
        { "-ctlecho",   0, ECHOCTL },
        { "echoprt",    ECHOPRT, 0 },
        { "-echoprt",   0, ECHOPRT },
        { "prterase",   ECHOPRT, 0 },
        { "-prterase",  0, ECHOPRT },
        { "isig",       ISIG, 0 },
        { "-isig",      0, ISIG },
        { "icanon",     ICANON, 0 },
        { "-icanon",    0, ICANON },
        { "noflsh",     NOFLSH, 0 },
        { "-noflsh",    0, NOFLSH },
        { "tostop",     TOSTOP, 0 },
        { "-tostop",    0, TOSTOP },
        { "flusho",     FLUSHO, 0 },
        { "-flusho",    0, FLUSHO },
        { "pendin",     PENDIN, 0 },
        { "-pendin",    0, PENDIN },
        { "crt",        ECHOE|ECHOKE|ECHOCTL, ECHOK|ECHOPRT },
        { "-crt",       ECHOK, ECHOE|ECHOKE|ECHOCTL },
        { "newcrt",     ECHOE|ECHOKE|ECHOCTL, ECHOK|ECHOPRT },
        { "-newcrt",    ECHOK, ECHOE|ECHOKE|ECHOCTL },
        { "nokerninfo", NOKERNINFO, 0 },
        { "-nokerninfo",0, NOKERNINFO },
        { "kerninfo",   0, NOKERNINFO },
        { "-kerninfo",  NOKERNINFO, 0 },
        { "xcase",      XCASE, 0 },
        { "-xcase",     0, XCASE },
        { NULL },
};

const struct modes omodes[] = {
        { "opost",      OPOST, 0 },
        { "-opost",     0, OPOST },
        { "litout",     0, OPOST },
        { "-litout",    OPOST, 0 },
        { "ocrnl",      OCRNL, 0 },
        { "-ocrnl",     0, OCRNL },
        { "olcuc",      OLCUC, 0 },
        { "-olcuc",     0, OLCUC },
        { "onlcr",      ONLCR, 0 },
        { "-onlcr",     0, ONLCR },
        { "onlret",     ONLRET, 0 },
        { "-onlret",    0, ONLRET },
        { "onocr",      ONOCR, 0 },
        { "-onocr",     0, ONOCR },
        { "tabs",       0, OXTABS },            /* "preserve" tabs */
        { "-tabs",      OXTABS, 0 },
        { "oxtabs",     OXTABS, 0 },
        { "-oxtabs",    0, OXTABS },
        { NULL },
};

#define CHK(s)  (*name == s[0] && !strcmp(name, s))

static int
msearch(char ***argvp, struct info *ip)
{
        const struct modes *mp;
        char *name;

        name = **argvp;

        for (mp = cmodes; mp->name; ++mp)
                if (CHK(mp->name)) {
                        ip->t.c_cflag &= ~mp->unset;
                        ip->t.c_cflag |= mp->set;
                        ip->set = 1;
                        return (1);
                }
        for (mp = imodes; mp->name; ++mp)
                if (CHK(mp->name)) {
                        ip->t.c_iflag &= ~mp->unset;
                        ip->t.c_iflag |= mp->set;
                        ip->set = 1;
                        return (1);
                }
        for (mp = lmodes; mp->name; ++mp)
                if (CHK(mp->name)) {
                        ip->t.c_lflag &= ~mp->unset;
                        ip->t.c_lflag |= mp->set;
                        ip->set = 1;
                        return (1);
                }
        for (mp = omodes; mp->name; ++mp)
                if (CHK(mp->name)) {
                        ip->t.c_oflag &= ~mp->unset;
                        ip->t.c_oflag |= mp->set;
                        ip->set = 1;
                        return (1);
                }
        return (0);
}

/*
 * from prinjob.c
 */

void
lp_stty(struct lp_printer *lp, int fd)
{
        struct info i;
        char **argv, **ap, **ep, *p, *val;

        printer = lp->lp_name;

        i.fd = fd;
        i.set = i.wset = 0;
        if (ioctl(i.fd, TIOCEXCL, (char *)0) == -1)
                fatal("%s: ioctl(TIOCEXCL)", printer);

        if (tcgetattr(i.fd, &i.t) == -1)
                fatal("%s: tcgetattr", printer);

        if (lp->lp_br > 0) {
                cfsetspeed(&i.t, lp->lp_br);
                i.set = 1;
        }
        if (lp->lp_ms) {
                if (ioctl(i.fd, TIOCGETD, &i.ldisc) == -1)
                        fatal("%s: ioctl(TIOCGETD)", printer);

                if (ioctl(i.fd, TIOCGWINSZ, &i.win) == -1)
                        log_warn("%s: ioctl(TIOCGWINSZ)", printer);

                argv = calloc(256, sizeof(char *));
                if (argv == NULL)
                        fatal("%s: malloc", printer);

                p = strdup(lp->lp_ms);
                ap = argv;
                ep = argv + 255;
                while ((val = strsep(&p, " \t,")) != NULL) {
                        if ((*ap++ = strdup(val)) == NULL)
                                fatal("%s: strdup", printer);
                        if (ap == ep)
                                fatal("%s: too many \"ms\" entries", printer);
                }
                *ap = NULL;

                for (; *argv; ++argv) {
                        if (ksearch(&argv, &i))
                                continue;
                        if (msearch(&argv, &i))
                                continue;
                        log_warnx("%s: unknown stty flag: %s", printer, *argv);
                }
        }

        if (i.set && tcsetattr(i.fd, TCSANOW, &i.t) == -1)
                fatal("%s: tcsetattr", printer);

        if (i.wset && ioctl(i.fd, TIOCSWINSZ, &i.win) == -1)
                log_warn("%s: ioctl(TIOCSWINSZ)", printer);
}