Ultrix-3.1/src/cmd/cu.c
/**********************************************************************
* Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. *
* All Rights Reserved. *
* Reference "/usr/src/COPYRIGHT" for applicable restrictions. *
**********************************************************************/
/*
* This is a version of CU that has been modified
* for use with the DF03 auto dialer.
* Ported from VMUNIX 4.1 BSD to V7M-11.
*
* Fred Canter 6/5/83
*/
static char Sccsid[] = "@(#)cu.c 3.0 4/21/86";
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <signal.h>
#include <sgtty.h>
/*
* defs that come from uucp.h
*/
#define NAMESIZE 15
#define FAIL -1
#define SAME 0
#define SLCKTIME 5400 /* system/device timeout (LCK.. files) in seconds */
#define ASSERT(e, f, v) if (!(e)) {\
fprintf(stderr, "AERROR - (%s) ", "e");\
fprintf(stderr, f, v);\
cleanup(FAIL);\
}
/*
* cu telno [-t] [-n] [-m] [-s speed] [-a acu] [-l line]
*
* -t is for dial-out to system.
* speeds are: 110, 150, 300, 1200, 2400, 4800, 9600.
* default for -t is 9600, 1200 otherwise.
*
* Escape with `~' at beginning of line.
* Ordinary diversions are ~<, ~> and ~>>.
* Silent output diversions are ~>: and ~>>:.
* Terminate output diversion with ~> alone.
* Quit is ~. and ~! gives local command or shell.
* Also ~$ for canned procedure pumping remote.
* ~%put from [to] and ~%take from [to] invoke builtins
*
* Modified for DF02/3 by Bill Shannon - 4/22/81
*/
#define CRLF "\r\n"
#define wrc(ds) write(ds,&c,1)
char devcua[30] = "/dev/cua0";
char *lspeed = "";
int ln; /* fd for comm line */
char tkill, terase; /* current input kill & erase */
int efk; /* process of id of listener */
char c;
char oc;
char *connmsg[] = {
"",
"line busy",
"call dropped",
"no carrier",
"can't fork",
"acu access",
"tty access",
"tty hung",
"usage: cu telno [-t] [-n] [-m] [-s speed] [-a acu] [-l line]",
"lock failed: line busy"
};
rdc(ds) {
ds=read(ds,&c,1);
oc = c;
c &= 0177;
return (ds);
}
int intr;
sig2()
{
signal(SIGINT, SIG_IGN);
intr = 1;
}
int set14;
xsleep(n)
{
xalarm(n);
pause();
xalarm(0);
}
xalarm(n)
{
set14=n;
alarm(n);
}
sig14()
{
signal(SIGALRM, sig14);
if (set14) alarm(1);
}
int dout;
int nhup;
int mflag; /* forces set DTR on line (modem) */
int dbflag;
int nullbrk; /* turn breaks (nulls) into dels */
struct sgttyb stbuf;
/*
* main: get connection, set speed for line.
* spawn child to invoke rd to read from line, output to fd 1
* main line invokes wr to read tty, write to line
*/
int speed;
main(ac,av)
char *av[];
{
int fk;
char *telno;
int cleanup();
signal(SIGALRM, sig14);
nhup = (int)signal(SIGINT, cleanup);
signal(SIGHUP, cleanup);
signal(SIGQUIT, cleanup);
if (ac < 2) {
prf(connmsg[8]);
exit(8);
}
for (; ac > 1; av++,ac--) {
if (av[1][0] != '-')
telno = av[1];
else switch(av[1][1]) {
case 't':
dout = 1;
strcpy(devcua, "/dev/cul0");
continue;
/* DEFUNCT */
case 'b':
/* nullbrk++; */
continue;
case 'd': /* DEBUG FLAG */
dbflag++;
continue;
case 's':
lspeed = av[2]; ++av; --ac;
break;
case 'a':
case 'l':
strncpy(devcua, av[2], 30); ++av; --ac;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
devcua[strlen(devcua)-1] = av[1][1];
break;
case 'm':
mflag++;
break;
default:
prf("Bad flag %s", av[1]);
break;
}
}
/*** TEMPORARY ACCOUNTING CODE ***/
{
FILE *f;
extern char *getenv();
if ((f = fopen("/usr/adm/culog", "a")) != NULL) {
fprintf(f, "%-8.8s %-20.20s %4.4s\n", getenv("USER"),
telno, lspeed);
fclose(f);
}
}
/*** END TEMPORARY ACCOUNTING CODE ***/
if (!exists(devcua))
exit(9);
switch(atoi(lspeed)) {
case 110:
speed = B110;break;
case 150:
speed = B150;break;
default:
if(dout)
speed = B9600;
else
speed = B1200;
break;
case 300:
speed = B300;break;
case 1200:
speed = B1200;break;
case 2400:
speed = B2400;break;
case 4800:
speed = B4800;break;
case 9600:
speed = B9600;break;
}
/*
* Can't tell if ACU is DF02 or DF03, SO
* we always dial at 300 BPS, then switch to 1200 BPS
* if necessary. This means that the DF02/3 ACU board
* must be setup for 300 BPS ACU communications speed !
* SEE ACU switch options in DF02/3 modem user's guide.
*/
if(!dout && (speed != B300)) {
stbuf.sg_ispeed = B300;
stbuf.sg_ospeed = B300;
} else {
stbuf.sg_ispeed = speed;
stbuf.sg_ospeed = speed;
}
stbuf.sg_flags = EVENP|ODDP;
stbuf.sg_flags |= RAW;
stbuf.sg_flags |= TANDEM;
stbuf.sg_flags &= ~ECHO;
if(!dout)
prf("\nDialing...");
ln = conn(devcua, telno);
if (ln < 0) {
prf("Connect failed: %s",connmsg[-ln]);
cleanup(-ln);
}
prf("\n\7Connected");
fk = fork();
signal(SIGINT, SIG_IGN);
if (fk == 0) {
chwrsig();
rd();
prf("\007Lost carrier");
cleanup(3);
}
mode(1);
efk = fk;
wr();
mode(0);
kill(fk, SIGKILL);
wait((int *)NULL);
stbuf.sg_ispeed = 0;
stbuf.sg_ospeed = 0;
ioctl(ln, TIOCSETP, &stbuf);
ioctl(ln, TIOCCDTR, (struct sgttyb *)NULL);
prf("\nDisconnected");
cleanup(0);
}
/*
* conn: establish dial-out connection.
* Example: fd = conn("/dev/cua0","4500");
* Returns descriptor open to tty for reading and writing.
* Negative values (-1...-7) denote errors in connmsg.
* Uses alarm and fork/wait; requires sig14 handler.
* Be sure to disconnect tty when done, via HUPCL or stty 0.
*/
conn(acu,telno)
char *acu, *telno;
{
extern errno;
char *atail;
char *rindex();
char c = 0;
int er, dn, t;
er=0;
atail = rindex(acu, '/')+1;
if (mlock(atail) == FAIL) {
er = 9;
goto X;
}
xalarm(40);
if ((dn=open(acu,2))<0) {
er=(errno == 6? 1:5);
goto X;
}
if(!dout || mflag)
ioctl(dn, TIOCSDTR, (struct sgttyb *)NULL);
ioctl(dn, TIOCSETP, &stbuf);
ioctl(dn, TIOCEXCL, (struct sgttyb *)NULL);
ioctl(dn, TIOCHPCL, (struct sgttyb *)NULL);
ioctl(dn, TIOCFLUSH, (struct sgttyb *)NULL);
xalarm(0);
if(dout)
goto X; /* direct connect, NO ACU ! */
t = strlen(telno);
if (t < 30)
t = 30;
xalarm(5*t);
t = write(dn, "\001", 1);
sleep(1); /* waste a little time */
t = write(dn, "\002", 1);
t = write(dn, telno, strlen(telno));
t = read(dn, &c, 1);
if (c != 'A')
er = 3;
xalarm(0);
if (t<0)
er=2;
/*
* Always dial at 300 BPS,
* may need to adjust speed !
*/
if(speed != B300) {
stbuf.sg_ispeed = speed;
stbuf.sg_ospeed = speed;
ioctl(dn, TIOCSETP, &stbuf);
ioctl(dn, TIOCEXCL, (struct sgttyb *)NULL);
ioctl(dn, TIOCHPCL, (struct sgttyb *)NULL);
ioctl(dn, TIOCFLUSH, (struct sgttyb *)NULL);
}
X:
if (er) {
delock(atail);
ioctl(dn, TIOCCDTR, (struct sgttyb *)NULL);
close(dn);
}
return (er? -er:dn);
}
/*
* wr: write to remote: 0 -> line.
* ~. terminate
* ~<file send file
* ~! local login-style shell
* ~!cmd execute cmd locally
* ~$proc execute proc locally, send output to line
* ~%cmd execute builtin cmd (put and take)
* ~# send 1-sec break
* ~^Z suspend cu process.
*/
wr()
{
int ds,fk,lcl,x;
char *p,b[600];
for (;;) {
p=b;
while (rdc(0) == 1) {
if (p == b) lcl=(c == '~');
if (p == b+1 && b[0] == '~') lcl=(c!='~');
if (nullbrk && c == 0) oc=c=0177; /* fake break char */
if (!lcl) {
c = oc;
if (wrc(ln) == 0) {
prf("line gone"); return;
}
c &= 0177;
}
if (lcl) {
/* if (c == 0177) c=tkill; */
if (c == '\r' || c == '\n') goto A;
wrc(0);
}
*p++=c;
if (c == terase) {
p=p-2;
if (p<b) p=b;
}
/* || c == 0177 REMOVED */
if (c == tkill || c == '\4' || c == '\r' || c == '\n') p=b;
}
return;
A:
echo("");
*p=0;
switch (b[1]) {
case '.':
case '\004':
return;
case '#':
ioctl(ln, TIOCSBRK, 0);
sleep(1);
ioctl(ln, TIOCCBRK, 0);
continue;
case '!':
case '$':
fk = fork();
if (fk == 0) {
char *getenv();
char *shell = getenv("SHELL");
if (shell == 0) shell = "/bin/sh";
close(1);
dup(b[1] == '$'? ln:2);
close(ln);
mode(0);
if (!nhup) signal(SIGINT, SIG_DFL);
if (b[2] == 0) execl(shell,shell,0);
/* if (b[2] == 0) execl(shell,"-",0); */
else execl(shell,"sh","-c",b+2,0);
prf("Can't execute shell");
exit(~0);
}
if (fk!=(-1)) {
while (wait(&x)!=fk);
}
mode(1);
if (b[1] == '!') echo("!");
else {
echo("$");
}
break;
case '<':
if (b[2] == 0) break;
if ((ds=open(b+2,0))<0) {
prf("Can't divert %s",b+1);
break;
}
intr=x=0;
mode(2);
if (!nhup) signal(SIGINT, sig2);
while (!intr && rdc(ds) == 1) {
if (wrc(ln) == 0) {
x=1;
break;
}
}
signal(SIGINT, SIG_IGN);
close(ds);
mode(1);
if (x) return;
echo("<");
break;
case '>':
case ':':
{
FILE *fp; char tbuff[128]; register char *q;
sprintf(tbuff,"/tmp/cu%d",efk);
if(NULL==(fp = fopen(tbuff,"w"))) {
prf("Can't tell other demon to divert");
break;
}
fprintf(fp,"%s\n",(b[1]=='>'?&b[2]: &b[1] ));
if(dbflag) prf("name to be written in temporary:"),prf(&b[2]);
fclose(fp);
kill(efk,SIGEMT);
}
break;
#ifdef SIGTSTP
#define CTRLZ 26
case CTRLZ:
mode(0);
kill(getpid(), SIGTSTP);
mode(1);
break;
#endif
case '%':
dopercen(&b[2]);
break;
default:
prf("Use `~~' to start line with `~'");
}
continue;
}
}
#define XOFF 023
#define XON 021
dopercen(line)
register char *line;
{
char *args[10];
register narg, f;
int rcount;
for (narg = 0; narg < 10;) {
while(*line == ' ' || *line == '\t')
line++;
if (*line == '\0')
break;
args[narg++] = line;
while(*line != '\0' && *line != ' ' && *line != '\t')
line++;
if (*line == '\0')
break;
*line++ = '\0';
}
if (equal(args[0], "take")) {
if (narg < 2) {
prf("usage: ~%%take from [to]");
return;
}
if (narg < 3)
args[2] = args[1];
/* wrln("stty tabs;"); */
wrln("echo '~>:'");
wrln(args[2]);
wrln(";tee /dev/null <");
wrln(args[1]);
wrln(";echo '~>'\n");
return;
} else if (equal(args[0], "put")) {
if (narg < 2) {
prf("usage: ~%%put from [to]");
return;
}
if (narg < 3)
args[2] = args[1];
if ((f = open(args[1], 0)) < 0) {
prf("cannot open: %s", args[1]);
return;
}
wrln("stty -echo;cat >");
wrln(args[2]);
wrln(";stty echo\n");
xsleep(5);
intr = 0;
if (!nhup)
signal(SIGINT, sig2);
mode(2);
rcount = 0;
while(!intr && rdc(f) == 1) {
rcount++;
if (c == tkill || c == terase)
wrln("\\");
if (wrc(ln) != 1) {
xsleep(2);
if (wrc(ln) != 1) {
prf("character missed");
intr = 1;
break;
}
}
}
signal(SIGINT, SIG_IGN);
close(f);
if (intr) {
wrln("\n");
prf("stopped after %d bytes", rcount);
}
wrln("\004");
xsleep(5);
mode(1);
return;
}
prf("~%%%s unknown\n", args[0]);
}
equal(s1, s2)
register char *s1, *s2;
{
while (*s1++ == *s2)
if (*s2++ == '\0')
return(1);
return(0);
}
wrln(s)
register char *s;
{
while (*s)
write(ln, s++, 1);
}
/* chwrsig: Catch orders from wr process
* to instigate diversion
*/
int whoami;
chwrsig(){
int dodiver();
whoami = getpid();
signal(SIGEMT,dodiver);
}
int ds,slnt;
int justrung;
dodiver(){
static char dobuff[128], morejunk[256]; register char *cp;
FILE *fp;
justrung = 1;
signal(SIGEMT,dodiver);
sprintf(dobuff,"/tmp/cu%d",whoami);
fp = fopen(dobuff,"r");
if(fp==NULL) prf("Couldn't open temporary");
unlink(dobuff);
if(dbflag) {
prf("Name of temporary:");
prf(dobuff);
}
fgets(dobuff,128,fp); fclose(fp);
if(dbflag) {
prf("Name of target file:");
prf(dobuff);
}
for(cp = dobuff-1; *++cp; ) /* squash newline */
if(*cp=='\n') *cp=0;
cp = dobuff;
if (*cp=='>') cp++;
if (*cp==':') {
cp++;
if(*cp==0) {
slnt ^= 1;
return;
} else {
slnt = 1;
}
}
if (ds >= 0) close(ds);
if (*cp==0) {
slnt = 0;
ds = -1;
return;
}
if (*dobuff!='>' || (ds=open(cp,1))<0) ds=creat(cp,0644);
lseek(ds, (long)0, 2);
if(ds < 0) prf("Creat failed:"), prf(cp);
if (ds<0) prf("Can't divert %s",cp+1);
}
/*
* rd: read from remote: line -> 1
* catch:
* ~>[>][:][file]
* stuff from file...
* ~> (ends diversion)
*/
rd()
{
extern int ds,slnt;
char *p,*q,b[600];
p=b;
ds=(-1);
agin:
while (rdc(ln) == 1) {
if (!slnt) wrc(1);
if (p < &b[600])
*p++=c;
if (c!='\n') continue;
q=p;
p=b;
if (b[0]!='~' || b[1]!='>') {
if (*(q-2) == '\r') {
q--;
*(q-1)=(*q);
}
if (ds>=0) write(ds,b,q-b);
continue;
}
if (ds>=0) close(ds);
if (slnt) {
write(1, b, q - b);
write(1, CRLF, sizeof(CRLF));
}
if (*(q-2) == '\r') q--;
*(q-1)=0;
slnt=0;
q=b+2;
if (*q == '>') q++;
if (*q == ':') {
slnt=1;
q++;
}
if (*q == 0) {
ds=(-1);
continue;
}
if (b[2]!='>' || (ds=open(q,1))<0) ds=creat(q,0644);
lseek(ds, (long)0, 2);
if (ds<0) prf("Can't divert %s",b+1);
}
if(justrung) {
justrung = 0;
goto agin;
}
}
mode(f)
{
struct sgttyb stbuf;
ioctl(0, TIOCGETP, &stbuf);
tkill = stbuf.sg_kill;
terase = stbuf.sg_erase;
if (f == 0) {
stbuf.sg_flags &= ~RAW;
stbuf.sg_flags |= ECHO|CRMOD;
}
if (f == 1) {
stbuf.sg_flags |= RAW;
stbuf.sg_flags &= ~(ECHO|CRMOD);
}
if (f == 2) {
stbuf.sg_flags &= ~RAW;
stbuf.sg_flags &= ~(ECHO|CRMOD);
}
ioctl(0, TIOCSETP, &stbuf);
}
echo(s)
char *s;
{
char *p;
for (p=s;*p;p++);
if (p>s) write(0,s,p-s);
write(0,CRLF, sizeof(CRLF));
}
prf(f, s)
char *f;
char *s;
{
fprintf(stderr, f, s);
fprintf(stderr, CRLF);
}
exists(devname)
char *devname;
{
if (access(devname, 0)==0)
return(1);
prf("%s does not exist", devname);
return(0);
}
cleanup(code)
{
rmlock(NULL);
exit(code);
}
/*
* This code is taken directly from uucp and follows the same
* conventions. This is important since uucp and cu should
* respect each others locks.
*/
/* ulockf 3.2 10/26/79 11:40:29 */
/* #include "uucp.h" */
/*******
* ulockf(file, atime)
* char *file;
* time_t atime;
*
* ulockf - this routine will create a lock file (file).
* If one already exists, the create time is checked for
* older than the age time (atime).
* If it is older, an attempt will be made to unlink it
* and create a new one.
*
* return codes: 0 | FAIL
*/
ulockf(file, atime)
char *file;
time_t atime;
{
struct stat stbuf;
time_t ptime;
int ret;
static int pid = -1;
static char tempfile[NAMESIZE];
if (pid < 0) {
pid = getpid();
sprintf(tempfile, "/usr/spool/uucp/LTMP.%d", pid);
}
if (onelock(pid, tempfile, file) == -1) {
/* lock file exists */
/* get status to check age of the lock file */
ret = stat(file, &stbuf);
if (ret != -1) {
time(&ptime);
if ((ptime - stbuf.st_ctime) < atime) {
/* file not old enough to delete */
return(FAIL);
}
}
ret = unlink(file);
ret = onelock(pid, tempfile, file);
if (ret != 0)
return(FAIL);
}
stlock(file);
return(0);
}
#define MAXLOCKS 10 /* maximum number of lock files */
char *Lockfile[MAXLOCKS];
int Nlocks = 0;
/***
* stlock(name) put name in list of lock files
* char *name;
*
* return codes: none
*/
stlock(name)
char *name;
{
char *p;
extern char *calloc();
int i;
for (i = 0; i < Nlocks; i++) {
if (Lockfile[i] == NULL)
break;
}
ASSERT(i < MAXLOCKS, "TOO MANY LOCKS %d", i);
if (i >= Nlocks)
i = Nlocks++;
p = calloc(strlen(name) + 1, sizeof (char));
ASSERT(p != NULL, "CAN NOT ALLOCATE FOR %s", name);
strcpy(p, name);
Lockfile[i] = p;
return;
}
/***
* rmlock(name) remove all lock files in list
* char *name; or name
*
* return codes: none
*/
rmlock(name)
char *name;
{
int i;
for (i = 0; i < Nlocks; i++) {
if (Lockfile[i] == NULL)
continue;
if (name == NULL
|| strcmp(name, Lockfile[i]) == SAME) {
unlink(Lockfile[i]);
free(Lockfile[i]);
Lockfile[i] = NULL;
}
}
return;
}
/* this stuff from pjw */
/* /usr/pjw/bin/recover - check pids to remove unnecessary locks */
/* isalock(name) returns 0 if the name is a lock */
/* unlock(name) unlocks name if it is a lock*/
/* onelock(pid,tempfile,name) makes lock a name
on behalf of pid. Tempfile must be in the same
file system as name. */
/* lock(pid,tempfile,names) either locks all the
names or none of them */
isalock(name) char *name;
{
struct stat xstat;
if(stat(name,&xstat)<0) return(0);
if(xstat.st_size!=sizeof(int)) return(0);
return(1);
}
unlock(name) char *name;
{
if(isalock(name)) return(unlink(name));
else return(-1);
}
onelock(pid,tempfile,name) char *tempfile,*name;
{ int fd;
fd=creat(tempfile,0444);
if(fd<0) return(-1);
write(fd,(char *) &pid,sizeof(int));
close(fd);
if(link(tempfile,name)<0)
{ unlink(tempfile);
return(-1);
}
unlink(tempfile);
return(0);
}
lock(pid,tempfile,names) char *tempfile,**names;
{ int i,j;
for(i=0;names[i]!=0;i++)
{ if(onelock(pid,tempfile,names[i])==0) continue;
for(j=0;j<i;j++) unlink(names[j]);
return(-1);
}
return(0);
}
#define LOCKPRE "/usr/spool/uucp/LCK."
/***
* delock(s) remove a lock file
* char *s;
*
* return codes: 0 | FAIL
*/
delock(s)
char *s;
{
char ln[30];
sprintf(ln, "%s.%s", LOCKPRE, s);
rmlock(ln);
}
/***
* mlock(sys) create system lock
* char *sys;
*
* return codes: 0 | FAIL
*/
mlock(sys)
char *sys;
{
char lname[30];
sprintf(lname, "%s.%s", LOCKPRE, sys);
return(ulockf(lname, (time_t) SLCKTIME ) < 0 ? FAIL : 0);
}
/***
* ultouch() update access and modify times for lock files
*
* return code - none
*/
ultouch()
{
time_t time();
int i;
struct ut {
time_t actime;
time_t modtime;
} ut;
ut.actime = time(&ut.modtime);
for (i = 0; i < Nlocks; i++) {
if (Lockfile[i] == NULL)
continue;
utime(Lockfile[i], &ut);
}
return;
}