543 lines
11 KiB
C
543 lines
11 KiB
C
/*
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* Copyright (c) 1995 Ugen J.S.Antsilevich
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*
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* Snoop stuff.
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*/
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#include "snp.h"
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#if NSNP > 0
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/ioctl_compat.h> /* Oooh..We need O/NTTYDISC */
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/file.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#include <sys/snoop.h>
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static d_open_t snpopen;
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static d_close_t snpclose;
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static d_read_t snpread;
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static d_write_t snpwrite;
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static d_ioctl_t snpioctl;
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static d_select_t snpselect;
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#define CDEV_MAJOR 53
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static struct cdevsw snp_cdevsw =
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{ snpopen, snpclose, snpread, snpwrite, /*53*/
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snpioctl, nostop, nullreset, nodevtotty,/* snoop */
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snpselect, nommap, NULL, "snp", NULL, -1 };
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#ifndef MIN
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#endif
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static struct snoop snoopsw[NSNP];
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static struct tty *devtotty __P((dev_t dev));
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static int snp_detach __P((struct snoop *snp));
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static struct tty *
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devtotty (dev)
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dev_t dev;
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{
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if (major(dev) > nchrdev)
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return (NULL); /* no such device available */
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return (*cdevsw[major(dev)]->d_devtotty)(dev);
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}
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#define SNP_INPUT_BUF 5 /* This is even too much,the maximal
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* interactive mode write is 3 bytes
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* length for function keys...
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*/
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static int
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snpwrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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int unit = minor(dev), len, i, error;
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struct snoop *snp = &snoopsw[unit];
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struct tty *tp;
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char c[SNP_INPUT_BUF];
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if (snp->snp_tty == NULL)
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return (EIO);
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tp = snp->snp_tty;
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if ((tp->t_sc == snp) && (tp->t_state & TS_SNOOP) &&
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(tp->t_line == OTTYDISC || tp->t_line == NTTYDISC))
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goto tty_input;
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printf("Snoop: attempt to write to bad tty.\n");
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return (EIO);
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tty_input:
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if (!(tp->t_state & TS_ISOPEN))
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return (EIO);
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while (uio->uio_resid > 0) {
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len = MIN(uio->uio_resid,SNP_INPUT_BUF);
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if ((error = uiomove(c, len, uio)) != 0)
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return (error);
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for (i=0;i<len;i++) {
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if (ttyinput(c[i] , tp))
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return (EIO);
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}
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}
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return 0;
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}
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static int
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snpread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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int unit = minor(dev), s;
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struct snoop *snp = &snoopsw[unit];
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int len, n, nblen, error = 0;
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caddr_t from;
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char *nbuf;
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#ifdef DIAGNOSTIC
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if ((snp->snp_len + snp->snp_base) > snp->snp_blen)
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panic("snoop buffer error");
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#endif
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if (snp->snp_tty == NULL)
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return (EIO);
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snp->snp_flags &= ~SNOOP_RWAIT;
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do {
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if (snp->snp_len == 0) {
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if (snp->snp_flags & SNOOP_NBIO) {
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return EWOULDBLOCK;
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}
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snp->snp_flags |= SNOOP_RWAIT;
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tsleep((caddr_t) snp, (PZERO + 1) | PCATCH, "snoopread", 0);
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}
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} while (snp->snp_len == 0);
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n = snp->snp_len;
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while (snp->snp_len > 0 && uio->uio_resid > 0 && error == 0) {
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len = MIN(uio->uio_resid, snp->snp_len);
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from = (caddr_t) (snp->snp_buf + snp->snp_base);
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if (len == 0)
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break;
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error = uiomove(from, len, uio);
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snp->snp_base += len;
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snp->snp_len -= len;
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}
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if ((snp->snp_flags & SNOOP_OFLOW) && (n < snp->snp_len)) {
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snp->snp_flags &= ~SNOOP_OFLOW;
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}
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s = spltty();
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nblen = snp->snp_blen;
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if (((nblen / 2) >= SNOOP_MINLEN) && (nblen / 2) >= snp->snp_len) {
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while (((nblen / 2) >= snp->snp_len) && ((nblen / 2) >= SNOOP_MINLEN))
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nblen = nblen / 2;
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if (nbuf = malloc(nblen, M_TTYS, M_NOWAIT)) {
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bcopy(snp->snp_buf + snp->snp_base, nbuf, snp->snp_len);
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free(snp->snp_buf, M_TTYS);
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snp->snp_buf = nbuf;
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snp->snp_blen = nblen;
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snp->snp_base = 0;
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}
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}
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splx(s);
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return error;
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}
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int
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snpinc(snp, c)
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struct snoop *snp;
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char c;
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{
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char buf[1];
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buf[0]=c;
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return (snpin(snp,buf,1));
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}
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int
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snpin(snp, buf, n)
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struct snoop *snp;
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char *buf;
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int n;
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{
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int s_free, s_tail;
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int s, len, nblen;
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caddr_t from, to;
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char *nbuf;
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if (n == 0)
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return 0;
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#ifdef DIAGNOSTIC
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if (n < 0)
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panic("bad snoop char count");
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if (!(snp->snp_flags & SNOOP_OPEN)) {
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printf("Snoop: data coming to closed device.\n");
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return 0;
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}
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#endif
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if (snp->snp_flags & SNOOP_DOWN) {
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printf("Snoop: more data to down interface.\n");
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return 0;
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}
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if (snp->snp_flags & SNOOP_OFLOW) {
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printf("Snoop: buffer overflow.\n");
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/*
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* On overflow we just repeat the standart close
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* procedure...yes , this is waste of space but.. Then next
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* read from device will fail if one would recall he is
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* snooping and retry...
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*/
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return (snpdown(snp));
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}
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s_tail = snp->snp_blen - (snp->snp_len + snp->snp_base);
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s_free = snp->snp_blen - snp->snp_len;
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if (n > s_free) {
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s = spltty();
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nblen = snp->snp_blen;
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while ((n > s_free) && ((nblen * 2) <= SNOOP_MAXLEN)) {
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nblen = snp->snp_blen * 2;
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s_free = nblen - (snp->snp_len + snp->snp_base);
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}
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if ((n <= s_free) && (nbuf = malloc(nblen, M_TTYS, M_NOWAIT))) {
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bcopy(snp->snp_buf + snp->snp_base, nbuf, snp->snp_len);
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free(snp->snp_buf, M_TTYS);
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snp->snp_buf = nbuf;
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snp->snp_blen = nblen;
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snp->snp_base = 0;
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} else {
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snp->snp_flags |= SNOOP_OFLOW;
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if (snp->snp_flags & SNOOP_RWAIT) {
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snp->snp_flags &= ~SNOOP_RWAIT;
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wakeup((caddr_t) snp);
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}
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splx(s);
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return 0;
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}
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splx(s);
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}
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if (n > s_tail) {
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from = (caddr_t) (snp->snp_buf + snp->snp_base);
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to = (caddr_t) (snp->snp_buf);
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len = snp->snp_len;
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bcopy(from, to, len);
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snp->snp_base = 0;
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}
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to = (caddr_t) (snp->snp_buf + snp->snp_base + snp->snp_len);
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bcopy(buf, to, n);
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snp->snp_len += n;
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if (snp->snp_flags & SNOOP_RWAIT) {
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snp->snp_flags &= ~SNOOP_RWAIT;
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wakeup((caddr_t) snp);
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}
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selwakeup(&snp->snp_sel);
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snp->snp_sel.si_pid = 0;
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return n;
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}
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static int
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snpopen(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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struct snoop *snp;
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register int unit, error;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return (error);
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if ((unit = minor(dev)) >= NSNP)
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return (ENXIO);
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snp = &snoopsw[unit];
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if (snp->snp_flags & SNOOP_OPEN)
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return (ENXIO);
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/*
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* We intentionally do not OR flags with SNOOP_OPEN,but set them so
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* all previous settings (especially SNOOP_OFLOW) will be cleared.
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*/
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snp->snp_flags = SNOOP_OPEN;
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snp->snp_buf = malloc(SNOOP_MINLEN, M_TTYS, M_WAITOK);
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snp->snp_blen = SNOOP_MINLEN;
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snp->snp_base = 0;
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snp->snp_len = 0;
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/*
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* snp_tty == NULL is for inactive snoop devices.
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*/
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snp->snp_tty = NULL;
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snp->snp_target = -1;
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return (0);
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}
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static int
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snp_detach(snp)
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struct snoop *snp;
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{
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struct tty *tp;
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snp->snp_base = 0;
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snp->snp_len = 0;
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/*
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* If line disc. changed we do not touch this pointer,SLIP/PPP will
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* change it anyway.
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*/
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if (snp->snp_tty == NULL)
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goto detach_notty;
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tp = snp->snp_tty;
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if (tp && (tp->t_sc == snp) && (tp->t_state & TS_SNOOP) &&
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(tp->t_line == OTTYDISC || tp->t_line == NTTYDISC)) {
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tp->t_sc = NULL;
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tp->t_state &= ~TS_SNOOP;
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} else
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printf("Snoop: bad attached tty data.\n");
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snp->snp_tty = NULL;
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snp->snp_target = -1;
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detach_notty:
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selwakeup(&snp->snp_sel);
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snp->snp_sel.si_pid = 0;
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return (0);
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}
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static int
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snpclose(dev, flags, fmt, p)
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dev_t dev;
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int flags;
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int fmt;
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struct proc *p;
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{
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register int unit = minor(dev);
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struct snoop *snp = &snoopsw[unit];
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snp->snp_blen = 0;
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free(snp->snp_buf, M_TTYS);
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snp->snp_flags &= ~SNOOP_OPEN;
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return (snp_detach(snp));
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}
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int
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snpdown(snp)
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struct snoop *snp;
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{
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snp->snp_blen = SNOOP_MINLEN;
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free(snp->snp_buf, M_TTYS);
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snp->snp_buf = malloc(SNOOP_MINLEN, M_TTYS, M_WAITOK);
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snp->snp_flags |= SNOOP_DOWN;
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return (snp_detach(snp));
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}
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static int
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snpioctl(dev, cmd, data, flags, p)
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dev_t dev;
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int cmd;
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caddr_t data;
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int flags;
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struct proc *p;
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{
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int unit = minor(dev), s;
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dev_t tdev;
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struct snoop *snp = &snoopsw[unit];
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struct tty *tp, *tpo;
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switch (cmd) {
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case SNPSTTY:
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tdev = *((dev_t *) data);
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if (tdev == -1)
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return (snpdown(snp));
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tp = devtotty(tdev);
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if (!tp)
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return (EINVAL);
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if ((tp->t_sc != (caddr_t) snp) && (tp->t_state & TS_SNOOP))
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return (EBUSY);
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if ((tp->t_line != OTTYDISC) && (tp->t_line != NTTYDISC))
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return (EBUSY);
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s = spltty();
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if (snp->snp_target == -1) {
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tpo = snp->snp_tty;
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if (tpo)
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tpo->t_state &= ~TS_SNOOP;
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}
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tp->t_sc = (caddr_t) snp;
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tp->t_state |= TS_SNOOP;
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snp->snp_tty = tp;
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snp->snp_target = tdev;
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/*
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* Clean overflow and down flags -
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* we'll have a chance to get them in the future :)))
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*/
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snp->snp_flags &= ~SNOOP_OFLOW;
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snp->snp_flags &= ~SNOOP_DOWN;
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splx(s);
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break;
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case SNPGTTY:
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/*
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* We keep snp_target field specially to make
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* SNPGTTY happy,else we can't know what is device
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* major/minor for tty.
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*/
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*((dev_t *) data) = snp->snp_target;
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break;
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case FIONBIO:
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if (*(int *) data)
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snp->snp_flags |= SNOOP_NBIO;
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else
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snp->snp_flags &= ~SNOOP_NBIO;
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break;
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case FIOASYNC:
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if (*(int *) data)
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snp->snp_flags |= SNOOP_ASYNC;
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else
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snp->snp_flags &= ~SNOOP_ASYNC;
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break;
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case FIONREAD:
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s = spltty();
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if (snp->snp_tty != NULL)
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*(int *) data = snp->snp_len;
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else
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if (snp->snp_flags & SNOOP_DOWN) {
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if (snp->snp_flags & SNOOP_OFLOW)
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*(int *) data = SNP_OFLOW;
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else
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*(int *) data = SNP_TTYCLOSE;
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} else {
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*(int *) data = SNP_DETACH;
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}
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splx(s);
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break;
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default:
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return (ENOTTY);
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}
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return (0);
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}
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static int
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snpselect(dev, rw, p)
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dev_t dev;
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int rw;
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struct proc *p;
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{
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int unit = minor(dev);
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struct snoop *snp = &snoopsw[unit];
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if (rw != FREAD)
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return 1;
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if (snp->snp_len > 0)
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return 1;
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/*
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* If snoop is down,we don't want to select() forever so we return 1.
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* Caller should see if we down via FIONREAD ioctl().The last should
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* return -1 to indicate down state.
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*/
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if (snp->snp_flags & SNOOP_DOWN)
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return 1;
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selrecord(p, &snp->snp_sel);
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return 0;
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}
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#ifdef DEVFS
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static void *snp_devfs_token[NSNP];
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#endif
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static snp_devsw_installed = 0;
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static void
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snp_drvinit(void *unused)
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{
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dev_t dev;
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#ifdef DEVFS
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int i;
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#endif
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if( ! snp_devsw_installed ) {
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev,&snp_cdevsw, NULL);
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snp_devsw_installed = 1;
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#ifdef DEVFS
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for ( i = 0 ; i < NSNP ; i++) {
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snp_devfs_token[i] =
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devfs_add_devswf(&snp_cdevsw, i, DV_CHR, 0, 0,
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0600, "snp%d", i);
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}
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#endif
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}
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}
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SYSINIT(snpdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,snp_drvinit,NULL)
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#endif
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