/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include "mt.h"
#include "uucp.h"

static void alarmtr(int);
static jmp_buf Sjbuf;
static char *fdig(char *);
#ifndef SMALL
static char *strecpy(char *, char *, char *);
#endif
static int interface(const char *);
static int fd_mklock(int);
static int getdialline(char *, int);
static int chat(int, char *[], int, char *, char *);
static void fixline(), fd_rmlock();
static void translate(char *, char *);
static int gdial(char *, char *[], int);
static int      Modemctrl;
static unsigned connecttime;
static int (*Setup)();

/*
 *      to add a new caller:
 *      declare the function that knows how to call on the device,
 *      add a line to the callers table giving the name of the device
 *      (from Devices file) and the name of the function
 *      add the function to the end of this file
 */

#ifdef TLI
static int      tlicall(char *[], char *[]);
#endif /* TLI */

static struct caller Caller[] = {

#ifdef TLI
        {"TLI",         tlicall},       /* AT&T Transport Layer Interface */
#ifdef TLIS
        {"TLIS",        tlicall},       /* AT&T Transport Layer Interface */
#endif /*  TLIS  */
#endif /* TLI */

        {NULL,          NULL}           /* this line must be last */
};

/*
 *      exphone - expand phone number for given prefix and number
 *
 *      return code - none
 */

static void
exphone(char *in, char *out)
{
        FILE *fn;
        char pre[MAXPH], npart[MAXPH], tpre[MAXPH], p[MAXPH];
        char buf[BUFSIZ];
        char *s1;

        if (!isalpha(*in)) {
                (void) strcpy(out, in);
                return;
        }

        s1 = pre;
        while (isalpha(*in))
                *s1++ = *in++;
        *s1 = NULLCHAR;
        s1 = npart;
        while (*in != NULLCHAR)
                *s1++ = *in++;
        *s1 = NULLCHAR;

        tpre[0] = NULLCHAR;
        fn = fopen(DIALCODES, "rF");
        if (fn != NULL) {
                while (fgets(buf, BUFSIZ, fn)) {
                        if (sscanf(buf, "%60s%60s", p, tpre) < 1)
                                continue;
                        if (EQUALS(p, pre))
                                break;
                        tpre[0] = NULLCHAR;
                }
                (void) fclose(fn);
        }

        (void) strcpy(out, tpre);
        (void) strcat(out, npart);
}

/*
 * repphone - Replace \D and \T sequences in arg with phone
 * expanding and translating as appropriate.
 */
static char *
repphone(char *arg, char *phone, char *trstr)
{
        static char *pbuf;      /* dynamically allocated below */
        char *fp, *tp;

        if (pbuf == NULL) {
                pbuf = malloc(2*(MAXPH+2));
                if (pbuf == NULL)
                        return (arg);
        }
        for (tp = pbuf; *arg; arg++) {
                if (*arg != '\\') {
                        *tp++ = *arg;
                        continue;
                } else {
                        switch (*(arg+1)) {
                        case 'T':
                                exphone(phone, tp);
                                translate(trstr, tp);
                                for (; *tp; tp++)
                                        ;
                                arg++;
                                break;
                        case 'D':
                                for (fp = phone; *tp = *fp++; tp++)
                                        ;
                                arg++;
                                break;
                        default:
                                *tp++ = *arg;
                                break;
                        }
                }
        }
        *tp = '\0';
        return (pbuf);
}

static uint_t saved_mode;
static char saved_dcname[20];

static int pop_push(int);
static void setdevcfg(char *, char *);
static void ttygenbrk(int);
/*
 * processdev - Process a line from the Devices file
 *
 * return codes:
 *      file descriptor  -  succeeded
 *      FAIL  -  failed
 */
static int
processdev(char *flds[], char *dev[])
{
        int dcf = -1;
        struct caller   *ca;
        char *args[D_MAX+1], dcname[20];
        char **sdev;
        int nullfd;
        char *phonecl;                  /* clear phone string */
        char phoneex[2*(MAXPH+2)];      /* expanded phone string */
        struct termio tty_orig;
        int ret_orig = -1;

        sdev = dev;
        /*      set up default "break" routine  */
        genbrk = ttygenbrk;

        /*      initialize Devconfig info       */
        DEBUG(5, "processdev: calling setdevcfg(%s, ", Progname);
        DEBUG(5, "%s)\n", flds[F_TYPE]);
        setdevcfg(Progname, flds[F_TYPE]);

        for (ca = Caller; ca->CA_type != NULL; ca++) {
                /* This will find built-in caller functions */
                if (EQUALS(ca->CA_type, dev[D_CALLER])) {
                        DEBUG(5, "Internal caller type %s\n", dev[D_CALLER]);
                        if (dev[D_ARG] == NULL) {
                                /* if NULL - assume translate */
                                /* needed for for loop later to mark the end */
                                dev[D_ARG+1] = NULL;
                                dev[D_ARG] = "\\T";
                        }
                        dev[D_ARG] = repphone(dev[D_ARG], flds[F_PHONE], "");
                        if ((dcf = (*(ca->CA_caller))(flds, dev)) < 0)
                                return (dcf);
                        if (interface(ca->CA_type)) {
                                DEBUG(5, "interface(%s) failed", ca->CA_type);
                                Uerror = SS_DEVICE_FAILED;
                                /*      restore vanilla unix interface  */
                                (void) interface("UNIX");
                                return (FAIL);
                        }
                        dev += 2; /* Skip to next CALLER and ARG */
                        break;
                }
        }
        if (dcf == -1) {
                /* Here if not a built-in caller function */

                /* We do locking (file and advisory) after open */

                /*
                 * Open the line
                 */
                if (*dev[D_LINE] != '/') {
                        (void) snprintf(dcname, sizeof (dcname),
                            "/dev/%s", dev[D_LINE]);
                } else {
                        (void) strcpy(dcname, dev[D_LINE]);
                }
                /* take care of the possible partial open fd */
                (void) close(nullfd = open("/", O_RDONLY));
                if (setjmp(Sjbuf)) {
                        (void) close(nullfd);
                        DEBUG(1, "generic open timeout\n%s", "");
                        logent("generic open", "TIMEOUT");
                        Uerror = SS_CANT_ACCESS_DEVICE;
                        goto bad;
                }
                (void) signal(SIGALRM, alarmtr);
                (void) alarm(10);
                if (Modemctrl) {
                        DEBUG(7, "opening with O_NDELAY set\n%s", "");
                        dcf = open(dcname, (O_RDWR | O_NDELAY));
                        saved_mode = O_RDWR | O_NDELAY;
                } else {
                        dcf = open(dcname, O_RDWR);
                        saved_mode = O_RDWR;
                }
                (void) strcpy(saved_dcname, dcname);
                (void) alarm(0);
                if (dcf < 0) {
                        DEBUG(1, "generic open failed, errno = %d\n", errno);
                        (void) close(nullfd);
                        logent("generic open", "FAILED");
                        Uerror = SS_CANT_ACCESS_DEVICE;
                        goto bad;
                }

                /* check locks BEFORE modifying the stream */

                if (fd_mklock(dcf) != SUCCESS) {
                        DEBUG(1, "failed to lock device %s\n", dcname);
                        Uerror = SS_LOCKED_DEVICE;
                        goto bad;
                }

                if (Modemctrl) {
                        DEBUG(7, "clear O_NDELAY\n%s", "");
                        if (fcntl(dcf, F_SETFL,
                            (fcntl(dcf, F_GETFL, 0) & ~O_NDELAY)) < 0) {
                                DEBUG(7, "clear O_NDELAY failed, errno %d\n",
                                    errno);
                                Uerror = SS_DEVICE_FAILED;
                                goto bad;
                        }
                }
        }

        if ((*Setup)(MASTER, &dcf, &dcf)) {
                /*      any device|system lock files we should remove?  */
                DEBUG(5, "MASTER Setup failed%s", "");
                Uerror = SS_DEVICE_FAILED;
                goto bad;
        }

        /* configure any requested streams modules */
        if (!pop_push(dcf)) {
                DEBUG(5, "STREAMS module configuration failed%s\n", "");
                Uerror = SS_DEVICE_FAILED;
                goto bad;
        }

        /* save initial state of line in case script fails */
        ret_orig = ioctl(dcf, TCGETA, &tty_orig);

        /* use sdev[] since dev[] is incremented for internal callers */
        fixline(dcf, atoi(fdig(sdev[D_CLASS])), D_DIRECT);

        /*
         * Now loop through the remaining callers and chat
         * according to scripts in dialers file.
         */
        for (; dev[D_CALLER] != NULL; dev += 2) {
                int w;
                /*
                 * Scan Dialers file to find an entry
                 */
                if ((w = gdial(dev[D_CALLER], args, D_MAX)) < 1) {
                        logent("generic call to gdial", "FAILED");
                        Uerror = SS_CANT_ACCESS_DEVICE;
                        goto bad;
                }
                if (w <= 2)     /* do nothing - no chat */
                        break;
                /*
                 * Translate the phone number
                 */
                if (dev[D_ARG] == NULL) {
                        /* if NULL - assume no translation */
                        /* needed for for loop to mark the end */
                        dev[D_ARG+1] = NULL;
                        dev[D_ARG] = "\\D";
                }

                phonecl = repphone(dev[D_ARG], flds[F_PHONE], args[1]);
                exphone(phonecl, phoneex);
                translate(args[1], phoneex);
                /*
                 * Chat
                 */
                if (chat(w-2, &args[2], dcf, phonecl, phoneex) != SUCCESS) {
                        CDEBUG(5, "\nCHAT gdial(%s) FAILED\n", dev[D_CALLER]);
                        Uerror = SS_CHAT_FAILED;
                        goto bad;
                }
        }
        /*
         * Success at last!
         */
        (void) strcpy(Dc, sdev[D_LINE]);
        return (dcf);
bad:
        if (dcf >= 0) {
                /* reset line settings if we got them in the beginning */
                if (ret_orig == 0)
                        (void) ioctl(dcf, TCSETAW, &tty_orig);
                fd_rmlock(dcf);
                (void) close(dcf);
        }
        /*      restore vanilla unix interface  */
        (void) interface("UNIX");
        return (FAIL);
}

/*
 * clear_hup()  clear the hangup state of the given device
 */
static int
clear_hup(int dcf)
{
        int ndcf;
        if ((ndcf = open(saved_dcname, saved_mode)) < 0) {
                return (FAIL);
        }
        if (ndcf != dcf) {
                (void) close(ndcf);
        }
        return (SUCCESS);
}


/*
 * translate the pairs of characters present in the first
 * string whenever the first of the pair appears in the second
 * string.
 */
static void
translate(char *ttab, char *str)
{
        char *s;

        for (; *ttab && *(ttab+1); ttab += 2)
                for (s = str; *s; s++)
                        if (*ttab == *s)
                                *s = *(ttab+1);
}

#define MAXLINE 512

static void dialreset(void);
#ifndef SMALL
static char *currdial(void);
#endif
/*
 * Get the information about the dialer.
 * gdial(type, arps, narps)
 *      type    -> type of dialer (e.g., penril)
 *      arps    -> array of pointers returned by gdial
 *      narps   -> number of elements in array returned by gdial
 * Return value:
 *      -1      -> Can't open DIALERFILE
 *      0       -> requested type not found
 *      >0      -> success - number of fields filled in
 */
static int
gdial(char *type, char *arps[], int narps)
{
        static char *info;      /* dynamically allocated MAXLINE */
        int na;

        DEBUG(2, "gdial(%s) called\n", type);
        if (info == NULL) {
                info = malloc(MAXLINE);
                if (info == NULL) {
                        DEBUG(1, "malloc failed for info in gdial\n", 0);
                        return (0);
                }
        }
        while (getdialline(info, MAXLINE)) {
                if ((info[0] == '#') || (info[0] == ' ') ||
                    (info[0] == '\t') || (info[0] == '\n'))
                        continue;
                if ((na = getargs(info, arps, narps)) == 0)
                        continue;
                if (EQUALS(arps[0], type)) {
                        DEBUG(5, "Trying caller script '%s'", type);
                        DEBUG(5, " from '%s'.\n", currdial());
                        dialreset();
                        bsfix(arps);
                        return (na);
                }
        }
        DEBUG(1, "%s not found in Dialers file\n", type);
        dialreset();
        return (0);
}

#ifdef TLI
/*
 *
 * AT&T Transport Layer Interface
 *
 * expected in Devices
 *      TLI line1 - - TLI
 * or
 *      TLIS line1 - - TLIS
 *
 */

#include <tiuser.h>

static void tfaillog(int fd, const char *s);

#define CONNECT_ATTEMPTS        3
#define TFREE(p, type)  if ((p)) (void) t_free((char *)(p), (type))

static struct netbuf    *stoa(char *, struct netbuf *);
/*
 * returns fd to remote uucp daemon
 */
/*ARGSUSED*/
static int
tlicall(char *flds[], char *dev[])
{
        char            addrbuf[ BUFSIZ ];
        char            devname[MAXNAMESIZE];
        int             fd;
        int             i, j;
        struct t_bind   *bind_ret = 0;
        struct t_info   tinfo;
        struct t_call   *sndcall = 0, *rcvcall = 0;


        if (dev[D_LINE][0] != '/') {
                /*      dev holds device name relative to /dev  */
                (void) snprintf(devname, sizeof (devname),
                    "/dev/%s", dev[D_LINE]);
        } else {
                /*      dev holds full path name of device      */
                (void) strcpy(devname, dev[D_LINE]);
        }
        /* gimme local transport endpoint */
        errno = t_errno = 0;
        if (setjmp(Sjbuf)) {
                DEBUG(1, "t_open timeout\n%s", "");
                logent("t_open", "TIMEOUT");
                Uerror = SS_NO_DEVICE;
                return (FAIL);
        }
        (void) signal(SIGALRM, alarmtr);
        (void) alarm(5);
        fd = t_open(devname, O_RDWR, &tinfo);
        (void) alarm(0);
        if (fd < 0) {
                tfaillog(fd, "t_open");
                Uerror = SS_NO_DEVICE;
                return (FAIL);
        }
        if (fd_mklock(fd) != SUCCESS) {
                (void) t_close(fd);
                DEBUG(1, "tlicall: failed to lock device %s\n", devname);
                Uerror = SS_LOCKED_DEVICE;
                return (FAIL);
        }

        /* allocate tli structures      */
        errno = t_errno = 0;
        /* LINTED pointer cast */
        if ((bind_ret = (struct t_bind *)t_alloc(fd, T_BIND, T_ALL)) == NULL ||
            /* LINTED pointer cast */
            (sndcall = (struct t_call *)t_alloc(fd, T_CALL, T_ALL)) == NULL ||
            /* LINTED pointer cast */
            (rcvcall = (struct t_call *)t_alloc(fd, T_CALL, T_ALL)) == NULL) {
                tfaillog(fd, "t_alloc");
                TFREE(bind_ret, T_BIND);
                TFREE(sndcall, T_CALL);
                TFREE(rcvcall, T_CALL);
                Uerror = SS_NO_DEVICE;
                return (FAIL);
        }

        /* bind */
        errno = t_errno = 0;
        if (t_bind(fd, (struct t_bind *)0, bind_ret) < 0) {
                tfaillog(fd, "t_bind");
                TFREE(bind_ret, T_BIND);
                TFREE(sndcall, T_CALL);
                TFREE(rcvcall, T_CALL);
                Uerror = SS_NO_DEVICE;
                fd_rmlock(fd);
                (void) t_close(fd);
                return (FAIL);
        }
        DEBUG(5, "tlicall: bound to %s\n", bind_ret->addr.buf);

        /*
         * Prepare to connect.
         *
         * If address begins with "\x", "\X", "\o", or "\O",
         * assume is hexadecimal or octal address and use stoa()
         * to convert it.
         *
         * Else is usual uucico address -- only \N's left to process.
         * Walk thru connection address, changing \N's to NULLCHARs.
         * Note:  If a NULLCHAR must be part of the connection address,
         * it must be overtly included in the address.  One recommended
         * way is to do it in the Devices file, thusly:
         *              Netname /dev/netport - - TLI \D\000
         * bsfix() turns \000 into \N and then the loop below makes it a
         * real, included-in-the-length null-byte.
         *
         * The DEBUG must print the strecpy'd address (so that
         * non-printables will have been replaced with C escapes).
         */

        DEBUG(5, "t_connect to addr \"%s\"\n",
            strecpy(addrbuf, dev[D_ARG], "\\"));

        if (dev[D_ARG][0] == '\\' && (dev[D_ARG][1] == 'x' ||
            dev[D_ARG][1] == 'X' || dev[D_ARG][1] == 'o' ||
            dev[D_ARG][1] == 'O')) {
                if (stoa(dev[D_ARG], &(sndcall->addr)) == NULL) {
                        DEBUG(5, "tlicall: stoa failed\n%s", "");
                        logent("tlicall", "string-to-address failed");
                        TFREE(bind_ret, T_BIND);
                        TFREE(sndcall, T_CALL);
                        TFREE(rcvcall, T_CALL);
                        Uerror = SS_NO_DEVICE;
                        fd_rmlock(fd);
                        (void) t_close(fd);
                        return (FAIL);
                }
        } else {
                for (i = j = 0; i < BUFSIZ && dev[D_ARG][i] != NULLCHAR;
                    ++i, ++j) {
                        if (dev[D_ARG][i] == '\\' && dev[D_ARG][i+1] == 'N') {
                                addrbuf[j] = NULLCHAR;
                                ++i;
                        } else {
                                addrbuf[j] = dev[D_ARG][i];
                        }
                }
                sndcall->addr.buf = addrbuf;
                sndcall->addr.len = j;
        }

        if (setjmp(Sjbuf)) {
                DEBUG(4, "timeout tlicall\n%s", "");
                logent("tlicall", "TIMEOUT");
                TFREE(bind_ret, T_BIND);
                TFREE(sndcall, T_CALL);
                TFREE(rcvcall, T_CALL);
                Uerror = SS_NO_DEVICE;
                fd_rmlock(fd);
                (void) t_close(fd);
                return (FAIL);
        }
        (void) signal(SIGALRM, alarmtr);
        (void) alarm(connecttime);

        /* connect to the service -- some listeners can't handle */
        /* multiple connect requests, so try it a few times */
        errno = t_errno = 0;
        for (i = 0; i < CONNECT_ATTEMPTS; ++i) {
                if (t_connect(fd, sndcall, rcvcall) == 0)
                        break;
                if ((t_errno == TLOOK) && (t_look(fd) == T_DISCONNECT)) {
                        (void) t_rcvdis(fd, NULL);
                        (void) alarm(0);
                } else {
                        (void) alarm(0);
                        tfaillog(fd, "t_connect");
                        TFREE(bind_ret, T_BIND);
                        TFREE(sndcall, T_CALL);
                        TFREE(rcvcall, T_CALL);
                        Uerror = SS_DIAL_FAILED;
                        fd_rmlock(fd);
                        (void) t_close(fd);
                        return (FAIL);
                }
        }
        (void) alarm(0);
        TFREE(bind_ret, T_BIND);
        TFREE(sndcall, T_CALL);
        TFREE(rcvcall, T_CALL);
        if (i == CONNECT_ATTEMPTS) {
                tfaillog(fd, "t_connect");
                Uerror = SS_DIAL_FAILED;
                fd_rmlock(fd);
                (void) t_close(fd);
                return (FAIL);
        }
        errno = t_errno = 0;
        (void) strcpy(Dc, dev[D_CALLER]);
        return (fd);
}
#endif /* TLI */