diald.c

PPP协议C语言源代码

#include "net.h"
#include "local.h"
#include "support.h"
#include "driver.h"
#include "ppp.h"
#include "script.h"

extern unsigned int clocks_per_sec;

/* This is used to save network specific information. */
static struct SAVINS {
    void (*comec)(int, struct NET *);
    int (*goingc)(struct NET *);
#if NTRACE >= 3
    char *name;
#endif
    MESS *mp;
    int logid;
    unsigned char *logp;
} _sv[NNETS];


static void format(struct NET *netp, MESS *mess);
static int getDialInt(unsigned char **sp);
static void expect(struct NET *netp, MESS *mess);
static int isSubString(char *a, char *b);
static int isIgnore(char c);


/*
** * * * * * *
** modemout()  Return the next modem character to transmit
**
** static int modemout(struct NET *netp);
**
** PARAMETERS:
**  (in/out) struct NET *netp   link-layer structure pointer
**
** RETURNS:
**  a character                 The next character to send
** -1                           No more characters to send
**
** DESCRIPTION:
**  This function will provide the driver with the characters it needs
**  to send out at a transmit interrupt.
*/
static int modemout(struct NET *netp)
{
    MESS *mess;
    int i1 = -1;
    (void)mess;

    if (netp->hw.chsout == 2) {             /* If transmitting now */
transmit:
        i1 = *netp->hw.bufout++;                /* Grab next character */
        if (i1 == 0) {
            netp->hw.chsout = 0;                /* No more data to send */
            netp->hw.st = ussDialStateNextE;    /* Ready for next command */
            netp->hw.idle_time = 0;             /* Stop waiting */

           /* Start expect immediately after SEND if possible */
            if (*++netp->hw.sp == ussDialXcmdExpectE) {
                netp->hw.sp++;
                expect(netp, _sv[netp->netno].mp);
            }
            return -1;
        }
    }
    else if (netp->hw.chsout == 1) {        /* If just starting */
        netp->hw.chsout = 2;                    /* Start transmitting */
        QUEUE_OUT(netp, depart, mess);            /* Grab fake TX buffer */
        goto transmit;                          /* Send character */
    }

    return i1;
}


/*
** * * * * * *
** modemin()  Place an arrived character in the in-buffer.
**
** static void modemin(int cc, struct NET *netp);
**
** PARAMETERS:
**  (in) int cc                 character that arrived
**  (in/out) struct NET *netp   link-layer structure pointer
**
** DESCRIPTION:
**  If this layer is expecting data (in the RECV state), paste characters
**  to the in-buffer and force a comparison with the expected data.
*/
static void modemin(int cc, struct NET *netp)
{
    int i1, i2;

   /* If we're in receive mode, append data and force check */
    if ((netp->hw.st & ussDialStateRecvE) == ussDialStateRecvE) {
        *netp->hw.bufin++ = (char)cc;       /* Grab next character */
        *netp->hw.bufin = 0;                /* Terminate string */
        netp->hw.st = ussDialStateRecvE|ussDialStateBChckE;

       /* If we are currently logging incoming data, try to log it */
        if ((i1 = _sv[netp->netno].logid) >= 0) {
            i2 = _sv[netp->netno].logp - ussDialLogTable[i1];
            i2 -= ussDialLogLenTable[i1];
           /* If there's room left in the array, add a log character */
            if (i2 < 0) {
                *_sv[netp->netno].logp++ = (char)cc;
                *_sv[netp->netno].logp = 0;
            }
            else {
               /* Stop logging */
                _sv[netp->netno].logp = 0;
                _sv[netp->netno].logid = -1;
            }
        }
    }
    return;
}


/*
** * * * * * *
** dialUp()  Set up for non-network terminal mode.
**
** static void dialUp(int netno);
**
** PARAMETERS:
**  (in) int netno              a yfnet network number
**
** DESCRIPTION:
**  This function will install new high-level I/O interrupt handlers
**  to enable terminal mode for interactions with a modem.
*/
static void dialUp(int netno)
{
    struct NET *netp;

    netp = &nets[netno];

    _sv[netno].comec = netp->hw.comec;
    _sv[netno].goingc = netp->hw.goingc;
#if NTRACE >= 3
    _sv[netno].name = 0;
#endif

    _sv[netno].mp->id = bWACK;              /* Don't De-allocate */
    _sv[netno].mp->netno = netno;           /* Network for driver */
    _sv[netno].logid = -1;                  /* No logging yet */
    _sv[netno].logp = 0;                    /* No log pointer */
    netp->hw.idle_time = 0;                 /* No wait time */

    DISABLE();
    netp->hw.comec = modemin;
    netp->hw.goingc = modemout;
    ENABLE();
}


/*
** * * * * * *
** dialDown()  Set up link layer network I/O mode (end terminal mode)
**
** static void dialDown(int netno);
**
** PARAMETERS:
**  (in) int netno              a yfnet network number
**
** DESCRIPTION:
**  This function will reinstall the old high-level I/O interrupt handlers
**  to enable PPP.
*/
static void dialDown(int netno)
{
    struct NET *netp;
    MESS *mess;
    char *cp;
    int i1;

    (void)mess;
    netp = &nets[netno];

   /* Remove buffer from depart queue if not done so yet */
    if ((netp->hw.st == (ussDialStateSendE|ussDialStateBWaitE)) && !QUEUE_EMPTY(netp, depart)) {
        QUEUE_OUT(netp, depart, mess);
    }
    _sv[netno].mp->id = bALLOC; /* Ready buffer for de-allocation */
    Nrelbuf(_sv[netno].mp);     /* De-allocate buffer */

    _sv[netno].mp = 0;
    netp->hw.chsout = 0;
    netp->hw.opt1 = 0;
    netp->hw.bufin = 0;

    DISABLE();
    netp->hw.comec = _sv[netno].comec;
    netp->hw.goingc = _sv[netno].goingc;
    ENABLE();
}


/*
** * * * * * *
** ussScriptTimeout()  Perform non-blocked script operations
**
** int ussScriptTimeout(int netno);
**
** PARAMETERS:
**  (in) int netno              a yfnet network number
**
** RETURNS:
** -1                           Finished with failure
**  0                           Still working
**  1                           Finished with success
**
** DESCRIPTION:
**  This function will drive a script's execution without blocking.
*/
int ussScriptTimeout(int netno)
{
    register struct NET *netp;
    int i1, i2;
    char c1, *cp, *cp2;
    unsigned long ul1;

    netp = &nets[netno];
   /* If the wait (but not the check) bit is set, check the time. */
    if ((netp->hw.st & (ussDialStateBWaitE|ussDialStateBChckE)) == ussDialStateBWaitE) {
        if (TimeMS() < netp->hw.idle_time)
            return 0;
        netp->hw.st &= ~ussDialStateBWaitE;
    }

    switch (netp->hw.st) {
    default:                    /* Unknown state */
    case ussDialStateNoneE:     /* Script not ready */
        goto term;
    case ussDialStateNextE:     /* Ready for next command */
next_command:
        switch (*netp->hw.sp++ & 0xff) {
        case ussDialXcmdInitE:  /* type */
            netp->hw.opt1 = 1;  /* Status flag is good */
            break;
        case ussDialXcmdSendE:  /* type {string|int|var} 0x00 */
            if (netp->hw.opt1) {
                netp->hw.st = ussDialStateSendE|ussDialStateBWaitE;
                netp->hw.idle_time = 3000 + TimeMS();   /* Wait time */
                format(netp, _sv[netno].mp);
                netp->hw.chsout = 1;
                if (netp->protoc[1]->writE(netno, _sv[netno].mp) != -1)
                {
                    break;              /* break if success */
                }
                netp->hw.chsout = 0;
                netp->hw.opt1 = 0;
                netp->hw.st = ussDialStateNextE;
            }
until_0:
           /* Find the end of send/expect */
            while ((c1 = *netp->hw.sp++) != 0)
                if (c1 == USS_DIAL_RCMD_VAR || c1 == USS_DIAL_RCMD_INT)
                    netp->hw.sp++;
            break;
        case ussDialXcmdExpectE:/* type string|var 0x00 */
            if (netp->hw.opt1)
                expect(netp, _sv[netno].mp);
            else {
                netp->hw.sp += 2;
                goto until_0;
            }
            break;
        case ussDialXcmdPauseE: /* type 1-octet-value */
            netp->hw.st = ussDialStatePausE|ussDialStateBWaitE;
            ul1 = getDialInt(&netp->hw.sp);
           /* Convert Seconds -> milliseconds */
            netp->hw.idle_time = 1000 * ul1 + TimeMS();
            break;
        case ussDialXcmdTagE:   /* type tag-name */
            netp->hw.sp++;
            break;
        case ussDialXcmdCheckE: /* type tag-name1 tag-name2 */
           /* If status is bad, goto tag-name2 */
            if (!netp->hw.opt1) {
bad_goto:
                netp->hw.sp++;
            }
            case ussDialXcmdGotoE:  /* type tag-name */
good_goto:
           /* Tag value */
            c1 = *netp->hw.sp & 0xff;
            for (cp=(char *)netp->hw.script; *cp!=(char)USS_DIAL_SFLAG; cp++) {
                if (*cp == ussDialXcmdTagE)
                    if (cp[1] == c1)
                        break;
            }
            if (*cp == (char)USS_DIAL_SFLAG)
                goto term;
            netp->hw.sp = (unsigned char *)cp;
            break;
        case ussDialXcmdIntE:   /* type index initial-value(two bytes) */
            i1 = *netp->hw.sp++;
            i2 = ((int)*netp->hw.sp++ << 8) & 0xff00;
            i2 += *netp->hw.sp++ & 0xff;
            ussDialIntTable[i1] = i2;
            break;
        case ussDialXcmdKillE:  /* type */
term:
#if NTRACE >= 3
            Nprintf("DIALD: Terminating script (bad) %s\n",
                _sv[netp->netno].name);
#endif
            netp->hw.st = ussDialStateNoneE;
            dialDown(netno);
            return -1;
        case ussDialXcmdDbgsE:  /* type trace-level {string|int|var} 0x00 */
            netp->hw.sp++;      /* Skip NTRACE level for now */
            while (*netp->hw.sp) {
#if PPP_DEBUG && NTRACE
                if (*netp->hw.sp == USS_DIAL_RCMD_VAR)
                    Nprintf("%s", *ussDialVarTable[*++netp->hw.sp]);
                else if (*netp->hw.sp == USS_DIAL_RCMD_INT)
                    Nprintf("%d", ussDialIntTable[*++netp->hw.sp]);
                else
                    Nputchr(*netp->hw.sp);
#else
                if (*netp->hw.sp == USS_DIAL_RCMD_VAR || *netp->hw.sp == USS_DIAL_RCMD_INT)
                    netp->hw.sp++;
#endif
                netp->hw.sp++;
            }
            netp->hw.sp++;
            return 0;           /* Don't do another command */
        case ussDialXcmdFileE:  /* type string 0x00 */
#if NTRACE >= 3
            _sv[netp->netno].name = (char *)netp->hw.sp;
#endif
            goto until_0;
        case ussDialXcmdMinusE: /* type int-index */
            netp->hw.sp++;
            ussDialIntTable[*netp->hw.sp++]--;
            break;
        case ussDialXcmdPlusE:  /* type int-index */
            netp->hw.sp++;
            ussDialIntTable[*netp->hw.sp++]++;
            break;
       /* type int-index|value >|<|= [=] int-index|value tag-name1 tag-name2 */
        case ussDialXcmdIfE:
           /* Value 1 */
            i1 = getDialInt(&netp->hw.sp);

           /* Condition (>|<|=)[=]*/
            c1 = 3;
            if (*netp->hw.sp == '>')    c1 += 2,    netp->hw.sp++;
            if (*netp->hw.sp == '<')    c1 -= 2,    netp->hw.sp++;
            if (*netp->hw.sp == '=')    c1++,       netp->hw.sp++;
            if (*netp->hw.sp == '=')    c1--,       netp->hw.sp++;

           /* Value 2 */