BSD 4_3_Tahoe release

[unix-history] / usr / src / usr.bin / tip / tip.c

diff --git a/usr/src/usr.bin/tip/tip.c b/usr/src/usr.bin/tip/tip.c
index ece27c6..019f29e 100644 (file)
--- a/usr/src/usr.bin/tip/tip.c
+++ b/usr/src/usr.bin/tip/tip.c
@@ -1,4 +1,18 @@
-/*     tip.c   4.11    81/12/16        */
+/*
+ * Copyright (c) 1983 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1983 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif not lint
+
+#ifndef lint
+static char sccsid[] = "@(#)tip.c      5.6 (Berkeley) 10/22/87";
+#endif not lint

 
 /*
  * tip - UNIX link to other systems
 
 /*
  * tip - UNIX link to other systems


@@ -16,15 +30,12 @@ int bauds[] = {
        1200, 1800, 2400, 4800, 9600, 19200, -1
 };
 
        1200, 1800, 2400, 4800, 9600, 19200, -1
 };
 

-#ifdef VMUNIX

 int    disc = OTTYDISC;                /* tip normally runs this way */
 int    disc = OTTYDISC;                /* tip normally runs this way */

-#endif
-

 int    intprompt();
 int    timeout();
 int    cleanup();
 char   *sname();
 int    intprompt();
 int    timeout();
 int    cleanup();
 char   *sname();

-extern char *sprintf();
+char   PNbuf[256];                     /* This limits the size of a number */

 
 main(argc, argv)
        char *argv[];
 
 main(argc, argv)
        char *argv[];


@@ -34,9 +45,13 @@ main(argc, argv)
        register char *p;
        char sbuf[12];
 
        register char *p;
        char sbuf[12];
 

+       gid = getgid();
+       egid = getegid();
+       uid = getuid();
+       euid = geteuid();

        if (equal(sname(argv[0]), "cu")) {
        if (equal(sname(argv[0]), "cu")) {

-               cumain(argc, argv);

                cumode = 1;
                cumode = 1;

+               cumain(argc, argv);

                goto cucommon;
        }
 
                goto cucommon;
        }
 


@@ -69,11 +84,26 @@ main(argc, argv)
                }
        }
 
                }
        }
 

+       if (system == NOSTR)
+               goto notnumber;
+       if (isalpha(*system))
+               goto notnumber;
+       /*
+        * System name is really a phone number...
+        * Copy the number then stomp on the original (in case the number
+        *      is private, we don't want 'ps' or 'w' to find it).
+        */
+       if (strlen(system) > sizeof PNbuf - 1) {
+               fprintf(stderr, "tip: phone number too long (max = %d bytes)\n",
+                       sizeof PNbuf - 1);
+               exit(1);
+       }
+       strncpy( PNbuf, system, sizeof PNbuf - 1 );

        for (p = system; *p; p++)
        for (p = system; *p; p++)

-               if (isalpha(*p))
-                       goto notnumber;
-       PN = system;            /* system name is really a phone number */
-       system = sprintf(sbuf, "tip%d", BR);
+               *p = '\0';
+       PN = PNbuf;
+       (void)sprintf(sbuf, "tip%d", BR);
+       system = sbuf;

 
 notnumber:
        signal(SIGINT, cleanup);
 
 notnumber:
        signal(SIGINT, cleanup);


@@ -92,15 +122,6 @@ notnumber:
        }
        setbuf(stdout, NULL);
        loginit();
        }
        setbuf(stdout, NULL);
        loginit();

-       /*
-        * Now that we have the logfile and the ACU open
-        *  return to the real uid and gid.  These things will
-        *  be closed on exit.  Note that we can't run as root,
-        *  because locking mechanism on the tty and the accounting
-        *  will be bypassed.
-        */
-       setuid(getuid());
-       setgid(getgid());

 
        /*
         * Kludge, their's no easy way to get the initialization
 
        /*
         * Kludge, their's no easy way to get the initialization


@@ -109,12 +130,22 @@ notnumber:
        if ((PH = getenv("PHONES")) == NOSTR)
                PH = "/etc/phones";
        vinit();                                /* init variables */
        if ((PH = getenv("PHONES")) == NOSTR)
                PH = "/etc/phones";
        vinit();                                /* init variables */

+       setparity("even");                      /* set the parity table */

        if ((i = speed(number(value(BAUDRATE)))) == NULL) {
                printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
                delock(uucplock);
                exit(3);
        }
 
        if ((i = speed(number(value(BAUDRATE)))) == NULL) {
                printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
                delock(uucplock);
                exit(3);
        }
 

+       /*
+        * Now that we have the logfile and the ACU open
+        *  return to the real uid and gid.  These things will
+        *  be closed on exit.  Swap real and effective uid's
+        *  so we can get the original permissions back
+        *  for removing the uucp lock.
+        */
+       user_uid();
+

        /*
         * Hardwired connections require the
         *  line speed set before they make any transmissions
        /*
         * Hardwired connections require the
         *  line speed set before they make any transmissions


@@ -124,6 +155,7 @@ notnumber:
                ttysetup(i);
        if (p = connect()) {
                printf("\07%s\n[EOT]\n", p);
                ttysetup(i);
        if (p = connect()) {
                printf("\07%s\n[EOT]\n", p);

+               daemon_uid();

                delock(uucplock);
                exit(1);
        }
                delock(uucplock);
                exit(1);
        }


@@ -134,15 +166,18 @@ cucommon:
         * From here down the code is shared with
         * the "cu" version of tip.
         */
         * From here down the code is shared with
         * the "cu" version of tip.
         */

+

        ioctl(0, TIOCGETP, (char *)&defarg);
        ioctl(0, TIOCGETC, (char *)&defchars);
        ioctl(0, TIOCGETP, (char *)&defarg);
        ioctl(0, TIOCGETC, (char *)&defchars);

-#ifdef VMUNIX
+       ioctl(0, TIOCGLTC, (char *)&deflchars);

        ioctl(0, TIOCGETD, (char *)&odisc);
        ioctl(0, TIOCGETD, (char *)&odisc);

-#endif

        arg = defarg;
        arg.sg_flags = ANYP | CBREAK;
        tchars = defchars;
        tchars.t_intrc = tchars.t_quitc = -1;
        arg = defarg;
        arg.sg_flags = ANYP | CBREAK;
        tchars = defchars;
        tchars.t_intrc = tchars.t_quitc = -1;

+       ltchars = deflchars;
+       ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
+               = ltchars.t_lnextc = -1;

        raw();
 
        pipe(fildes); pipe(repdes);
        raw();
 
        pipe(fildes); pipe(repdes);


@@ -150,7 +185,7 @@ cucommon:
 
        /*
         * Everything's set up now:
 
        /*
         * Everything's set up now:

-        *      connection established (hardwired or diaulup)
+        *      connection established (hardwired or dialup)

         *      line conditioned (baud rate, mode, etc.)
         *      internal data structures (variables)
         * so, fork one process for local side and one for remote.
         *      line conditioned (baud rate, mode, etc.)
         *      internal data structures (variables)
         * so, fork one process for local side and one for remote.


@@ -165,24 +200,60 @@ cucommon:
 
 cleanup()
 {
 
 cleanup()
 {

+
+       daemon_uid();

        delock(uucplock);
        delock(uucplock);

-#ifdef VMUNIX

        if (odisc)
                ioctl(0, TIOCSETD, (char *)&odisc);
        if (odisc)
                ioctl(0, TIOCSETD, (char *)&odisc);

-#endif

        exit(0);
 }
 
        exit(0);
 }
 

+/*
+ * Muck with user ID's.  We are setuid to the owner of the lock
+ * directory when we start.  user_uid() reverses real and effective
+ * ID's after startup, to run with the user's permissions.
+ * daemon_uid() switches back to the privileged uid for unlocking.
+ * Finally, to avoid running a shell with the wrong real uid,
+ * shell_uid() sets real and effective uid's to the user's real ID.
+ */
+static int uidswapped;
+
+user_uid()
+{
+       if (uidswapped == 0) {
+               setregid(egid, gid);
+               setreuid(euid, uid);
+               uidswapped = 1;
+       }
+}
+
+daemon_uid()
+{
+
+       if (uidswapped) {
+               setreuid(uid, euid);
+               setregid(gid, egid);
+               uidswapped = 0;
+       }
+}
+
+shell_uid()
+{
+
+       setreuid(uid, uid);
+       setregid(gid, gid);
+}
+

 /*
  * put the controlling keyboard into raw mode
  */
 raw()
 {
 /*
  * put the controlling keyboard into raw mode
  */
 raw()
 {

+

        ioctl(0, TIOCSETP, &arg);
        ioctl(0, TIOCSETC, &tchars);
        ioctl(0, TIOCSETP, &arg);
        ioctl(0, TIOCSETC, &tchars);

-#ifdef VMUNIX
+       ioctl(0, TIOCSLTC, &ltchars);

        ioctl(0, TIOCSETD, (char *)&disc);
        ioctl(0, TIOCSETD, (char *)&disc);

-#endif

 }
 
 
 }
 
 


@@ -191,13 +262,15 @@ raw()
  */
 unraw()
 {
  */
 unraw()
 {

-#ifdef VMUNIX
+

        ioctl(0, TIOCSETD, (char *)&odisc);
        ioctl(0, TIOCSETD, (char *)&odisc);

-#endif

        ioctl(0, TIOCSETP, (char *)&defarg);
        ioctl(0, TIOCSETC, (char *)&defchars);
        ioctl(0, TIOCSETP, (char *)&defarg);
        ioctl(0, TIOCSETC, (char *)&defchars);

+       ioctl(0, TIOCSLTC, (char *)&deflchars);

 }
 
 }
 

+static jmp_buf promptbuf;
+

 /*
  * Print string ``s'', then read a string
  *  in from the terminal.  Handles signals & allows use of
 /*
  * Print string ``s'', then read a string
  *  in from the terminal.  Handles signals & allows use of


@@ -208,23 +281,22 @@ prompt(s, p)
        register char *p;
 {
        register char *b = p;
        register char *p;
 {
        register char *b = p;

+       int (*oint)(), (*oquit)();

 
        stoprompt = 0;
 
        stoprompt = 0;

-       signal(SIGINT, intprompt);
-       signal(SIGQUIT, SIG_IGN);
+       oint = signal(SIGINT, intprompt);
+       oint = signal(SIGQUIT, SIG_IGN);

        unraw();
        printf("%s", s);
        unraw();
        printf("%s", s);

-       while ((*p = getchar()) != EOF && *p != '\n') {
-               if (stoprompt)
-                       goto pbreak;
-               p++;
-       }
+       if (setjmp(promptbuf) == 0)
+               while ((*p = getchar()) != EOF && *p != '\n')
+                       p++;

        *p = '\0';
        *p = '\0';

-pbreak:
+

        raw();
        raw();

-       signal(SIGINT, SIG_DFL);
-       signal(SIGQUIT,SIG_DFL);
-       return(stoprompt || p == b);
+       signal(SIGINT, oint);
+       signal(SIGQUIT, oint);
+       return (stoprompt || p == b);

 }
 
 /*
 }
 
 /*


@@ -232,9 +304,11 @@ pbreak:
  */
 intprompt()
 {
  */
 intprompt()
 {

+

        signal(SIGINT, SIG_IGN);
        stoprompt = 1;
        printf("\r\n");
        signal(SIGINT, SIG_IGN);
        stoprompt = 1;
        printf("\r\n");

+       longjmp(promptbuf, 1);

 }
 
 /*
 }
 
 /*


@@ -266,14 +340,18 @@ tipin()
                        continue;
                } else if (gch == '\r') {
                        bol = 1;
                        continue;
                } else if (gch == '\r') {
                        bol = 1;

-                       write(FD, &gch, 1);
+                       pwrite(FD, &gch, 1);
+                       if (boolean(value(HALFDUPLEX)))
+                               printf("\r\n");

                        continue;
                } else if (!cumode && gch == character(value(FORCE)))
                        gch = getchar()&0177;
                bol = any(gch, value(EOL));
                if (boolean(value(RAISE)) && islower(gch))
                        continue;
                } else if (!cumode && gch == character(value(FORCE)))
                        gch = getchar()&0177;
                bol = any(gch, value(EOL));
                if (boolean(value(RAISE)) && islower(gch))

-                       toupper(gch);
-               write(FD, &gch, 1);
+                       gch = toupper(gch);
+               pwrite(FD, &gch, 1);
+               if (boolean(value(HALFDUPLEX)))
+                       printf("%c", gch);

        }
 }
 
        }
 }
 


@@ -291,44 +369,46 @@ escape()
        gch = (getchar()&0177);
        for (p = etable; p->e_char; p++)
                if (p->e_char == gch) {
        gch = (getchar()&0177);
        for (p = etable; p->e_char; p++)
                if (p->e_char == gch) {

-                       if ((p->e_flags&PRIV) && getuid())
+                       if ((p->e_flags&PRIV) && uid)

                                continue;
                        printf("%s", ctrl(c));
                        (*p->e_func)(gch);
                                continue;
                        printf("%s", ctrl(c));
                        (*p->e_func)(gch);

-                       return(0);
+                       return (0);

                }
        /* ESCAPE ESCAPE forces ESCAPE */
        if (c != gch)
                }
        /* ESCAPE ESCAPE forces ESCAPE */
        if (c != gch)

-               write(FD, &c, 1);
-       return(gch);
+               pwrite(FD, &c, 1);
+       return (gch);

 }
 
 speed(n)
 }
 
 speed(n)

+       int n;

 {
        register int *p;
 
        for (p = bauds; *p != -1;  p++)
                if (*p == n)
 {
        register int *p;
 
        for (p = bauds; *p != -1;  p++)
                if (*p == n)

-                       return(p-bauds);
-       return(NULL);
+                       return (p - bauds);
+       return (NULL);

 }
 
 any(c, p)
        register char c, *p;
 {
 }
 
 any(c, p)
        register char c, *p;
 {

-       while (*p)
+       while (p && *p)

                if (*p++ == c)
                if (*p++ == c)

-                       return(1);
-       return(0);
+                       return (1);
+       return (0);

 }
 
 size(s)
        register char   *s;
 {
 }
 
 size(s)
        register char   *s;
 {

-       register int    i = 0;
+       register int i = 0;

 
 

-       while (*s++) i++;
-       return(i);
+       while (s && *s++)
+               i++;
+       return (i);

 }
 
 char *
 }
 
 char *


@@ -354,7 +434,7 @@ interp(s)
                ;
        }
        *p = '\0';
                ;
        }
        *p = '\0';

-       return(buf);
+       return (buf);

 }
 
 char *
 }
 
 char *


@@ -371,7 +451,7 @@ ctrl(c)
                s[0] = c;
                s[1] = '\0';
        }
                s[0] = c;
                s[1] = '\0';
        }

-       return(s);
+       return (s);

 }
 
 /*
 }
 
 /*


@@ -385,7 +465,7 @@ help(c)
 
        printf("%c\r\n", c);
        for (p = etable; p->e_char; p++) {
 
        printf("%c\r\n", c);
        for (p = etable; p->e_char; p++) {

-               if ((p->e_flags&PRIV) && getuid())
+               if ((p->e_flags&PRIV) && uid)

                        continue;
                printf("%2s", ctrl(character(value(ESCAPE))));
                printf("%-2s %c   %s\r\n", ctrl(p->e_char),
                        continue;
                printf("%2s", ctrl(character(value(ESCAPE))));
                printf("%-2s %c   %s\r\n", ctrl(p->e_char),


@@ -397,17 +477,16 @@ help(c)
  * Set up the "remote" tty's state
  */
 ttysetup(speed)
  * Set up the "remote" tty's state
  */
 ttysetup(speed)

+       int speed;

 {
 {

-#ifdef VMUNIX

        unsigned bits = LDECCTQ;
        unsigned bits = LDECCTQ;

-#endif

 
        arg.sg_ispeed = arg.sg_ospeed = speed;
 
        arg.sg_ispeed = arg.sg_ospeed = speed;

-       arg.sg_flags = TANDEM|RAW;
+       arg.sg_flags = RAW;
+       if (boolean(value(TAND)))
+               arg.sg_flags |= TANDEM;

        ioctl(FD, TIOCSETP, (char *)&arg);
        ioctl(FD, TIOCSETP, (char *)&arg);

-#ifdef VMUNIX

        ioctl(FD, TIOCLBIS, (char *)&bits);
        ioctl(FD, TIOCLBIS, (char *)&bits);

-#endif

 }
 
 /*
 }
 
 /*


@@ -425,3 +504,68 @@ sname(s)
                        p = s;
        return (p);
 }
                        p = s;
        return (p);
 }

+
+static char partab[0200];
+
+/*
+ * Do a write to the remote machine with the correct parity.
+ * We are doing 8 bit wide output, so we just generate a character
+ * with the right parity and output it.
+ */
+pwrite(fd, buf, n)
+       int fd;
+       char *buf;
+       register int n;
+{
+       register int i;
+       register char *bp;
+       extern int errno;
+
+       bp = buf;
+       for (i = 0; i < n; i++) {
+               *bp = partab[(*bp) & 0177];
+               bp++;
+       }
+       if (write(fd, buf, n) < 0) {
+               if (errno == EIO)
+                       abort("Lost carrier.");
+               /* this is questionable */
+               perror("write");
+       }
+}
+
+/*
+ * Build a parity table with appropriate high-order bit.
+ */
+setparity(defparity)
+       char *defparity;
+{
+       register int i;
+       char *parity;
+       extern char evenpartab[];
+
+       if (value(PARITY) == NOSTR)
+               value(PARITY) = defparity;
+       parity = value(PARITY);
+       for (i = 0; i < 0200; i++)
+               partab[i] = evenpartab[i];
+       if (equal(parity, "even"))
+               return;
+       if (equal(parity, "odd")) {
+               for (i = 0; i < 0200; i++)
+                       partab[i] ^= 0200;      /* reverse bit 7 */
+               return;
+       }
+       if (equal(parity, "none") || equal(parity, "zero")) {
+               for (i = 0; i < 0200; i++)
+                       partab[i] &= ~0200;     /* turn off bit 7 */
+               return;
+       }
+       if (equal(parity, "one")) {
+               for (i = 0; i < 0200; i++)
+                       partab[i] |= 0200;      /* turn on bit 7 */
+               return;
+       }
+       fprintf(stderr, "%s: unknown parity value\n", PA);
+       fflush(stderr);
+}