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more changes from rick adams.
[unix-history] / usr / src / usr.bin / uucp / acucntrl / acucntrl.c
#ifndef lint
static char sccsid[] = "@(#)acucntrl.c 5.2 (Berkeley) %G%";
#endif
/* acucntrl - turn around tty line between dialin and dialout
*
* Usage: acucntrl {enable,disable} /dev/ttydX
*
* History:
* First written by Allan Wilkes (fisher!allan)
*
* Modified June 8,1983 by W.Sebok (astrovax!wls) to poke kernel rather
* than use kernel hack to turn on/off modem control, using subroutine
* stolen from program written by Tsutomu Shimomura
* {astrovax,escher}!tsutomu
*
* Worked over many times by W.Sebok (i.e. hacked to death)
*
* Operation:
* disable (i.e. setup for dialing out)
* (1) check input arguments
* (2) look in /etc/utmp to check that the line is not in use by another
* (3) disable modem control on terminal
* (4) check for carrier on device
* (5) change owner of device to real id
* (6) edit /etc/ttys, changing the first character of the appropriate
* line to 0
* (7) send a hangup to process 1 to poke init to disable getty
* (8) post uid name in capitals in /etc/utmp to let world know device has
* been grabbed
* (9) make sure that DTR is on
*
* enable (i.e.) restore for dialin
* (1) check input arguments
* (2) look in /etc/utmp to check that the line is not in use by another
* (3) make sure modem control on terminal is disabled
* (4) turn off DTR to make sure line is hung up
* (5) condition line: clear exclusive use and set hangup on close modes
* (6) turn on modem control
* (7) edit /etc/ttys, changing the first character of the appropriate
* line to 1
* (8) send a hangup to process 1 to poke init to enable getty
* (9) clear uid name for /etc/utmp
*/
/* #define SENSECARRIER */
#include "uucp.h"
#include <sys/buf.h>
#include <signal.h>
#include <sys/conf.h>
#ifdef BSD4_2
#include "/sys/vaxuba/ubavar.h"
#else
#include <sys/ubavar.h>
#endif
#include <sys/stat.h>
#include <nlist.h>
#include <sgtty.h>
#include <utmp.h>
#include <pwd.h>
#include <stdio.h>
#define NDZLINE 8 /* lines/dz */
#define NDHLINE 16 /* lines/dh */
#define NDMFLINE 8 /* lines/dmf */
#define DZ11 1
#define DH11 2
#define DMF 3
#define NLVALUE(val) (nl[val].n_value)
struct nlist nl[] = {
#define CDEVSW 0
{ "_cdevsw" },
#define DZOPEN 1
{ "_dzopen" },
#define DZINFO 2
{ "_dzinfo" },
#define NDZ11 3
{ "_dz_cnt" },
#define DZSCAR 4
{ "_dzsoftCAR" },
#define DHOPEN 5
{ "_dhopen" },
#define DHINFO 6
{ "_dhinfo" },
#define NDH11 7
{ "_ndh11" },
#define DHSCAR 8
{ "_dhsoftCAR" },
#define DMFOPEN 9
{ "_dmfopen" },
#define DMFINFO 10
{ "_dmfinfo" },
#define NDMF 11
{ "_ndmf" },
#define DMFSCAR 12
{ "_dmfsoftCAR" },
{ "\0" }
};
#define ENABLE 1
#define DISABLE 0
char Etcutmp[] = "/etc/utmp";
char Etcttys[] = "/etc/ttys";
char Devhome[] = "/dev";
char usage[] = "Usage: acucntrl {dis|en}able ttydX\n";
struct utmp utmp;
char resettty, resetmodem;
int etcutmp;
off_t utmploc;
off_t ttyslnbeg;
#define NAMSIZ sizeof(utmp.ut_name)
#define LINSIZ sizeof(utmp.ut_line)
main(argc, argv)
int argc; char *argv[];
{
register char *p;
register int i;
char uname[NAMSIZ], Uname[NAMSIZ];
int enable ;
char *device;
int devfile;
int uid, gid;
off_t lseek();
struct passwd *getpwuid();
char *rindex();
extern int errno;
extern char *sys_errlist[];
/* check input arguments */
if (argc!=3) {
fprintf(stderr, usage);
exit(1);
}
/* interpret command type */
if (prefix(argv[1], "disable") || strcmp(argv[1],"dialout")==0)
enable = 0;
else if (prefix(argv[1], "enable") || strcmp(argv[1],"dialin")==0)
enable = 1;
else {
fprintf(stderr, usage);
exit(1);
}
device = rindex(argv[2],'/');
device = (device == NULL) ? argv[2]: device+1;
/* only recognize devices of the form ttydX */
if (strncmp(device,"ttyd",4)!=0) {
fprintf(stderr,"Bad Device Name %s",device);
exit(1);
}
opnttys(device);
/* Get nlist info */
nlist("/vmunix",nl);
/* Chdir to /dev */
if(chdir(Devhome) < 0) {
fprintf(stderr, "Cannot chdir to %s: %s\r\n",
Devhome, sys_errlist[errno]);
exit(1);
}
/* Get uid information */
uid = getuid();
gid = getgid();
p = getpwuid(uid)->pw_name;
if (p==NULL) {
fprintf(stderr,"cannot get uid name\n");
exit(1);
}
/* to upper case */
i = 0;
do {
uname[i] = *p;
Uname[i] = (*p>='a' && *p<='z') ? (*p - ('a'-'A')) : *p;
i++; p++;
} while (*p && i<NAMSIZ);
/* check to see if line is being used */
if( (etcutmp = open(Etcutmp, 2)) < 0) {
fprintf(stderr,"On open %s open: %s\n",
Etcutmp,sys_errlist[errno]);
exit(1);
}
(void)lseek(etcutmp,utmploc, 0);
i = read(etcutmp,(char *)&utmp,sizeof(struct utmp));
if(
i == sizeof(struct utmp) &&
utmp.ut_line[0] != '\0' &&
utmp.ut_name[0] != '\0' &&
(
!upcase(utmp.ut_name,NAMSIZ) ||
(
uid != 0 &&
strncmp(utmp.ut_name,Uname,NAMSIZ) != 0
)
)
) {
fprintf(stderr, "%s in use by %s\n", device, utmp.ut_name);
exit(2);
}
/* Disable modem control */
if (setmodem(device,DISABLE)<0) {
fprintf(stderr,"Unable to disable modem control\n");
exit(1);
}
if (enable) {
if((devfile = open(device, 1)) < 0) {
fprintf(stderr,"On open of %s: %s\n",
device, sys_errlist[errno]);
(void)setmodem(device,resetmodem);
exit(1);
}
/* Try one last time to hang up */
if (ioctl(devfile,(int)TIOCCDTR,(char *)0) < 0)
fprintf(stderr,"On TIOCCDTR ioctl: %s\n",
sys_errlist[errno]);
if (ioctl(devfile, (int)TIOCNXCL,(char *)0) < 0)
fprintf(stderr,
"Cannot clear Exclusive Use on %s: %s\n",
device, sys_errlist[errno]);
if (ioctl(devfile, (int)TIOCHPCL,(char *)0) < 0)
fprintf(stderr,
"Cannot set hangup on close on %s: %s\n",
device, sys_errlist[errno]);
i = resetmodem;
if (setmodem(device,ENABLE) < 0) {
fprintf(stderr,"Cannot Enable modem control\n");
(void)setmodem(device,i);
exit(1);
}
resetmodem=i;
if (settys(ENABLE)) {
fprintf(stderr,"%s already enabled\n",device);
} else {
pokeinit(device,Uname,enable);
}
post(device,"");
} else {
#if defined(TIOCMGET) && defined(SENSECARRIER)
if (uid!=0) {
int linestat = 0;
/* check for presence of carrier */
sleep(2); /* need time after modem control turnoff */
if((devfile = open(device, 1)) < 0) {
fprintf(stderr,"On open of %s: %s\n",
device, sys_errlist[errno]);
(void)setmodem(device,resetmodem);
exit(1);
}
(void)ioctl(devfile,TIOCMGET,&linestat);
if (linestat&TIOCM_CAR) {
fprintf(stderr,"%s is in use (Carrier On)\n",
device);
(void)setmodem(device,resetmodem);
exit(2);
}
(void)close(devfile);
}
#endif TIOCMGET
/* chown device */
if(chown(device, uid, gid) < 0)
fprintf(stderr, "Cannot chown %s: %s\n",
device, sys_errlist[errno]);
/* poke init */
if(settys(DISABLE)) {
fprintf(stderr,"%s already disabled\n",device);
} else {
pokeinit(device,Uname,enable);
}
post(device,Uname);
if((devfile = open(device, 1)) < 0) {
fprintf(stderr, "On %s open: %s\n",
device, sys_errlist[errno]);
} else {
if(ioctl(devfile, (int)TIOCSDTR, (char *)0) < 0)
fprintf(stderr,
"Cannot set DTR on %s: %s\n",
device, sys_errlist[errno]);
}
}
exit(0);
}
/* return true if no lower case */
upcase(str,len)
register char *str;
register int len;
{
for (; *str, --len >= 0 ; str++)
if (*str>='a' && *str<='z')
return(0);
return(1);
}
/* Post name to public */
post(device,name)
char *device, *name;
{
(void)time((time_t *)&utmp.ut_time);
strcpyn(utmp.ut_line, device, LINSIZ);
strcpyn(utmp.ut_name, name, NAMSIZ);
if (lseek(etcutmp, utmploc, 0)<0)
fprintf(stderr,"on lseek in /etc/utmp: %s",
sys_errlist[errno]);
if (write(etcutmp, (char *)&utmp, sizeof(utmp))<0)
fprintf(stderr,"on write in /etc/utmp: %s",
sys_errlist[errno]);
}
/* poke process 1 and wait for it to do its thing */
pokeinit(device,uname,enable)
char *uname, *device; int enable;
{
struct utmp utmp;
register int i;
post(device, uname);
/* poke init */
if (kill(1, SIGHUP)) {
fprintf(stderr,
"Cannot send hangup to init process: %s\n",
sys_errlist[errno]);
(void)settys(resettty);
(void)setmodem(device,resetmodem);
exit(1);
}
if (enable)
return;
/* wait till init has responded, clearing the utmp entry */
i=100;
do {
sleep(1);
if (lseek(etcutmp,utmploc,0)<0)
fprintf(stderr,"On lseek in /etc/utmp: %s",
sys_errlist[errno]);
if (read(etcutmp,(char *)&utmp,sizeof utmp)<0)
fprintf(stderr,"On read from /etc/utmp: %s",
sys_errlist[errno]);
} while (utmp.ut_name[0] != '\0' && --i > 0);
}
/* identify terminal line in ttys */
opnttys(device)
char *device;
{
register FILE *ttysfile;
register int ndevice, lnsiz;
register char *p;
char *index();
char linebuf[100];
ttysfile = fopen(Etcttys, "r");
if(ttysfile == NULL) {
fprintf(stderr, "Cannot open %s: %s\n", Etcttys,
sys_errlist[errno]);
exit(1);
}
ndevice = strlen(device);
ttyslnbeg = 0;
utmploc = 0;
while(fgets(linebuf, sizeof(linebuf) - 1, ttysfile) != NULL) {
utmploc += sizeof(utmp);
lnsiz = strlen(linebuf);
if ((p = index(linebuf,'\n')) != NULL)
*p = '\0';
if(strncmp(device, &linebuf[2], ndevice) == 0) {
(void)fclose(ttysfile);
return;
}
ttyslnbeg += lnsiz;
}
fprintf(stderr, "%s not found in %s\n", device, Etcttys);
exit(1);
}
/* modify appropriate line in /etc/ttys to turn on/off the device */
settys(enable)
int enable;
{
int ittysfil;
char out,in;
ittysfil = open(Etcttys, 2);
if(ittysfil == NULL) {
fprintf(stderr, "Cannot open %s for output: %s\n",
Etcttys, sys_errlist[errno]);
exit(1);
}
(void)lseek(ittysfil,ttyslnbeg,0);
if(read(ittysfil,&in,1)<0) {
fprintf(stderr,"On %s write: %s\n",
Etcttys, sys_errlist[errno]);
exit(1);
}
resettty = (in == '1');
out = enable ? '1' : '0';
(void)lseek(ittysfil,ttyslnbeg,0);
if(write(ittysfil,&out,1)<0) {
fprintf(stderr,"On %s write: %s\n",
Etcttys, sys_errlist[errno]);
exit(1);
}
(void)close(ittysfil);
return(in==out);
}
/*
* Excerpted from (June 8,1983 W.Sebok)
* > ttymodem.c - enable/disable modem control for tty lines.
* >
* > Knows about DZ11s and DH11/DM11s.
* > 23.3.83 - TS
* > modified to know about DMF's (hasn't been tested) Nov 8,1984 - WLS
*/
setmodem(ttyline,enable)
char *ttyline; int enable;
{
dev_t dev;
int kmem;
int unit,line,nlines,addr,tflags;
int devtype=0;
char cflags; short sflags;
#ifdef BSD4_2
int flags;
#else
short flags;
#endif
struct uba_device *ubinfo;
struct stat statb;
struct cdevsw cdevsw;
if(nl[CDEVSW].n_type == 0) {
fprintf(stderr,"No namelist.\n");
return(-1);
}
if((kmem = open("/dev/kmem", 2)) < 0) {
fprintf(stderr,"/dev/kmem open: %s\n", sys_errlist[errno]);
return(-1);
}
if(stat(ttyline,&statb) < 0) {
fprintf(stderr,"%s stat: %s\n", ttyline, sys_errlist[errno]);
return(-1);
}
if((statb.st_mode&S_IFMT) != S_IFCHR) {
fprintf(stderr,"%s is not a character device.\n",ttyline);
return(-1);
}
dev = statb.st_rdev;
(void)lseek(kmem,
(off_t) &(((struct cdevsw *)NLVALUE(CDEVSW))[major(dev)]),0);
(void)read(kmem,(char *) &cdevsw,sizeof cdevsw);
if((int)(cdevsw.d_open) == NLVALUE(DZOPEN)) {
devtype = DZ11;
unit = minor(dev) / NDZLINE;
line = minor(dev) % NDZLINE;
addr = (int) &(((int *)NLVALUE(DZINFO))[unit]);
(void)lseek(kmem,(off_t) NLVALUE(NDZ11),0);
} else if((int)(cdevsw.d_open) == NLVALUE(DHOPEN)) {
devtype = DH11;
unit = minor(dev) / NDHLINE;
line = minor(dev) % NDHLINE;
addr = (int) &(((int *)NLVALUE(DHINFO))[unit]);
(void)lseek(kmem,(off_t) NLVALUE(NDH11),0);
} else if((int)(cdevsw.d_open) == NLVALUE(DMFOPEN)) {
devtype = DMF;
unit = minor(dev) / NDMFLINE;
line = minor(dev) % NDMFLINE;
addr = (int) &(((int *)NLVALUE(DMFINFO))[unit]);
(void)lseek(kmem,(off_t) NLVALUE(NDMF),0);
} else {
fprintf(stderr,"Device %s (%d/%d) unknown.\n",ttyline,
major(dev),minor(dev));
return(-1);
}
(void)read(kmem,(char *) &nlines,sizeof nlines);
if(minor(dev) >= nlines) {
fprintf(stderr,"Sub-device %d does not exist (only %d).\n",
minor(dev),nlines);
return(-1);
}
(void)lseek(kmem,(off_t)addr,0);
(void)read(kmem,(char *) &ubinfo,sizeof ubinfo);
(void)lseek(kmem,(off_t) &(ubinfo->ui_flags),0);
(void)read(kmem,(char *) &flags,sizeof flags);
tflags = 1<<line;
resetmodem = ((flags&tflags) == 0);
flags = enable ? (flags & ~tflags) : (flags | tflags);
(void)lseek(kmem,(off_t) &(ubinfo->ui_flags),0);
(void)write(kmem,(char *) &flags, sizeof flags);
switch(devtype) {
case DZ11:
if((addr = NLVALUE(DZSCAR)) == 0) {
fprintf(stderr,"No dzsoftCAR.\n");
return(-1);
}
cflags = flags;
(void)lseek(kmem,(off_t) &(((char *)addr)[unit]),0);
(void)write(kmem,(char *) &cflags, sizeof cflags);
break;
case DH11:
if((addr = NLVALUE(DHSCAR)) == 0) {
fprintf(stderr,"No dhsoftCAR.\n");
return(-1);
}
sflags = flags;
(void)lseek(kmem,(off_t) &(((short *)addr)[unit]),0);
(void)write(kmem,(char *) &sflags, sizeof sflags);
break;
case DMF:
if((addr = NLVALUE(DMFSCAR)) == 0) {
fprintf(stderr,"No dmfsoftCAR.\n");
return(-1);
}
cflags = flags;
(void)lseek(kmem,(off_t) &(((char *)addr)[unit]),0);
(void)write(kmem,(char *) &flags, sizeof cflags);
break;
default:
fprintf(stderr,"Unknown device type\n");
return(-1);
}
return(0);
}
prefix(s1, s2)
register char *s1, *s2;
{
register char c;
while ((c = *s1++) == *s2++)
if (c == '\0')
return (1);
return (c == '\0');
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.