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BSD 4 release
[unix-history] / usr / src / cmd / cu.c
static char *sccsid = "@(#)cu.c 4.1 (Berkeley) 10/1/80";
#include <stdio.h>
#include <signal.h>
#include <sgtty.h>
/*
* cu telno [-t] [-s speed] [-l line] [-a acu]
*
* -t is for dial-out to terminal.
* speeds are: 110, 134, 150, 300, 1200. 300 is default.
*
* 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
*/
#define CRLF "\r\n"
#define wrc(ds) write(ds,&c,1)
char *devcul = "/dev/cul0";
char *devcua = "/dev/cua0";
char *lspeed = "300";
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] [-s speed] [-l line] [-a acu]"
};
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 dbflag;
/*
* 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
*/
main(ac,av)
char *av[];
{
int fk;
int speed;
char *telno;
struct sgttyb stbuf;
signal(SIGALRM, sig14);
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;
--ac;
continue;
case 'd':
dbflag++;
continue;
case 's':
lspeed = av[2]; ++av; --ac;
break;
case 'l':
devcul = av[2]; ++av; --ac;
break;
case 'a':
devcua = av[2]; ++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];
devcul[strlen(devcul)-1] = av[1][1];
break;
default:
prf("Bad flag %s", av[1]);
break;
}
}
if (!exists(devcua) || !exists(devcul))
exit(9);
ln = conn(devcul, devcua, telno);
if (ln < 0) {
prf("Connect failed: %s",connmsg[-ln]);
exit(-ln);
}
switch(atoi(lspeed)) {
case 110:
speed = B110;break;
case 150:
speed = B150;break;
default:
case 300:
speed = B300;break;
case 1200:
speed = B1200;break;
}
stbuf.sg_ispeed = speed;
stbuf.sg_ospeed = speed;
stbuf.sg_flags = EVENP|ODDP;
if (!dout) {
stbuf.sg_flags |= RAW;
stbuf.sg_flags &= ~ECHO;
}
ioctl(ln, TIOCSETP, &stbuf);
ioctl(ln, TIOCEXCL, (struct sgttyb *)NULL);
ioctl(ln, TIOCHPCL, (struct sgttyb *)NULL);
prf("Connected");
if (dout)
fk = -1;
else
fk = fork();
nhup = (int)signal(SIGINT, SIG_IGN);
if (fk == 0) {
chwrsig();
rd();
prf("\007Lost carrier");
exit(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);
prf("Disconnected");
exit(0);
}
/*
* conn: establish dial-out connection.
* Example: fd = conn("/dev/ttyh","/dev/dn1","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(dev,acu,telno)
char *dev, *acu, *telno;
{
struct sgttyb stbuf;
extern errno;
char *p, *q, b[30];
int er, fk, dn, dh, t;
er=0;
fk=(-1);
if ((dn=open(acu,1))<0) {
er=(errno == 6? 1:5);
goto X;
}
if ((fk=fork()) == (-1)) {
er=4;
goto X;
}
if (fk == 0) {
open(dev,2);
for (;;) pause();
}
xsleep(2);
/*
* copy phone #, assure EON
*/
p=b;
q=telno;
while (*p++=(*q++))
;
p--;
if (*(p-1)!='<') {
/*if (*(p-1)!='-') *p++='-';*/
*p++='<';
}
t=p-b;
xalarm(5*t);
t=write(dn,b,t);
xalarm(0);
if (t<0) {
er=2;
goto X;
}
/* close(dn) */
xalarm(40); /* was 5; sometimes missed carrier */
dh = open(dev,2);
xalarm(0);
if (dh<0) {
er=(errno == 4? 3:6);
goto X;
}
ioctl(ln, TIOCGETP, &stbuf);
stbuf.sg_flags &= ~ECHO;
xalarm(10);
ioctl(dh, TIOCSETP, &stbuf);
ioctl(dh, TIOCHPCL, (struct sgttyb *)NULL);
xalarm(0);
X:
if (er) close(dn);
if (fk!=(-1)) {
kill(fk, SIGKILL);
xalarm(10);
while ((t=wait((int *)NULL))!=(-1) && t!=fk);
xalarm(0);
}
return (er? -er:dh);
}
/*
* wr: write to remote: 0 -> line.
* ~. terminate
* ~<file send file
* ~! local login-style shell
* ~!cmd execute cmd locally
* ~$proc execute proc locally, send output to line
* ~%cmd execute builtin cmd (put and take)
* ~# send 1-sec break
*/
wr()
{
int ds,fk,lcl,x;
char *p,b[600];
for (;;) {
p=b;
while (rdc(0) == 1) {
if (p == b) lcl=(c == '~');
if (p == b+1 && b[0] == '~') lcl=(c!='~');
/* if (c == 0) oc=c=0177; fake break kludge */
if (!lcl) {
c = oc;
if (wrc(ln) == 0) {
prf("line gone"); return;
}
c &= 0177;
}
if (lcl) {
if (c == 0177) c=tkill;
if (c == '\r' || c == '\n') goto A;
if (!dout) wrc(0);
}
*p++=c;
if (c == terase) {
p=p-2;
if (p<b) p=b;
}
if (c == tkill || c == 0177 || c == '\4' || c == '\r' || c == '\n') p=b;
}
return;
A:
if (!dout) echo("");
*p=0;
switch (b[1]) {
case '.':
case '\004':
return;
case '#':
ioctl(ln, TIOCSBRK, 0);
sleep(1);
ioctl(ln, TIOCCBRK, 0);
continue;
case '!':
case '$':
fk = fork();
if (fk == 0) {
char *getenv();
char *shell = getenv("SHELL");
if (shell == 0) shell = "/bin/sh";
close(1);
dup(b[1] == '$'? ln:2);
close(ln);
mode(0);
if (!nhup) signal(SIGINT, SIG_DFL);
if (b[2] == 0) execl(shell,shell,0);
/* if (b[2] == 0) execl(shell,"-",0); */
else execl(shell,"sh","-c",b+2,0);
prf("Can't execute shell");
exit(~0);
}
if (fk!=(-1)) {
while (wait(&x)!=fk);
}
mode(1);
if (b[1] == '!') echo("!");
else {
if (dout) echo("$");
}
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;
if (dout) 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;
}
}
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("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);
*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;
}
}
struct {char lobyte; char hibyte;};
mode(f)
{
struct sgttyb stbuf;
if (dout) return;
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);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.