libnsl/dial/callers.c

/*
 * 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) 1989, 2011, Oracle and/or its affiliates. All rights reserved.
 */

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

#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;
    if ((bind_ret = (struct t_bind *)t_alloc(fd, T_BIND, T_ALL)) == NULL ||
        (sndcall = (struct t_call *)t_alloc(fd, T_CALL, T_ALL)) == NULL ||
        (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 */