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freebsd/libexec/telnetd/utility.c
Mark Murray e895047b95 After running a "make unifdef", commit the resultant diffs. 
This code is now a complete sunset of the crypto (master) code.
2001-11-30 22:03:20 +00:00

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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static const char sccsid[] = "@(#)utility.c 8.4 (Berkeley) 5/30/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#ifdef __FreeBSD__
#include <locale.h>
#include <sys/utsname.h>
#endif
#include <string.h>
#define PRINTOPTIONS
#include "telnetd.h"
/*
* utility functions performing io related tasks
*/
/*
* ttloop
*
* A small subroutine to flush the network output buffer, get some data
* from the network, and pass it through the telnet state machine. We
* also flush the pty input buffer (by dropping its data) if it becomes
* too full.
*/
void
ttloop()
{
DIAG(TD_REPORT, output_data("td: ttloop\r\n"));
if (nfrontp - nbackp > 0) {
netflush();
}
ncc = read(net, netibuf, sizeof netibuf);
if (ncc < 0) {
syslog(LOG_INFO, "ttloop: read: %m");
exit(1);
} else if (ncc == 0) {
syslog(LOG_INFO, "ttloop: peer died: %m");
exit(1);
}
DIAG(TD_REPORT, output_data("td: ttloop read %d chars\r\n", ncc));
netip = netibuf;
telrcv(); /* state machine */
if (ncc > 0) {
pfrontp = pbackp = ptyobuf;
telrcv();
}
} /* end of ttloop */
/*
* Check a descriptor to see if out of band data exists on it.
*/
int
stilloob(int s)
{
static struct timeval timeout = { 0, 0 };
fd_set excepts;
int value;
do {
FD_ZERO(&excepts);
FD_SET(s, &excepts);
memset((char *)&timeout, 0, sizeof timeout);
value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
} while ((value == -1) && (errno == EINTR));
if (value < 0) {
fatalperror(pty, "select");
}
if (FD_ISSET(s, &excepts)) {
return 1;
} else {
return 0;
}
}
void
ptyflush(void)
{
int n;
if ((n = pfrontp - pbackp) > 0) {
DIAG(TD_REPORT | TD_PTYDATA,
output_data("td: ptyflush %d chars\r\n", n));
DIAG(TD_PTYDATA, printdata("pd", pbackp, n));
n = write(pty, pbackp, n);
}
if (n < 0) {
if (errno == EWOULDBLOCK || errno == EINTR)
return;
cleanup(0);
}
pbackp += n;
if (pbackp == pfrontp)
pbackp = pfrontp = ptyobuf;
}
/*
* nextitem()
*
* Return the address of the next "item" in the TELNET data
* stream. This will be the address of the next character if
* the current address is a user data character, or it will
* be the address of the character following the TELNET command
* if the current address is a TELNET IAC ("I Am a Command")
* character.
*/
static char *
nextitem(char *current)
{
if ((*current&0xff) != IAC) {
return current+1;
}
switch (*(current+1)&0xff) {
case DO:
case DONT:
case WILL:
case WONT:
return current+3;
case SB: /* loop forever looking for the SE */
{
char *look = current+2;
for (;;) {
if ((*look++&0xff) == IAC) {
if ((*look++&0xff) == SE) {
return look;
}
}
}
}
default:
return current+2;
}
} /* end of nextitem */
/*
* netclear()
*
* We are about to do a TELNET SYNCH operation. Clear
* the path to the network.
*
* Things are a bit tricky since we may have sent the first
* byte or so of a previous TELNET command into the network.
* So, we have to scan the network buffer from the beginning
* until we are up to where we want to be.
*
* A side effect of what we do, just to keep things
* simple, is to clear the urgent data pointer. The principal
* caller should be setting the urgent data pointer AFTER calling
* us in any case.
*/
void
netclear(void)
{
char *thisitem, *next;
char *good;
#define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
thisitem = netobuf;
while ((next = nextitem(thisitem)) <= nbackp) {
thisitem = next;
}
/* Now, thisitem is first before/at boundary. */
good = netobuf; /* where the good bytes go */
while (nfrontp > thisitem) {
if (wewant(thisitem)) {
int length;
next = thisitem;
do {
next = nextitem(next);
} while (wewant(next) && (nfrontp > next));
length = next-thisitem;
memmove(good, thisitem, length);
good += length;
thisitem = next;
} else {
thisitem = nextitem(thisitem);
}
}
nbackp = netobuf;
nfrontp = good; /* next byte to be sent */
neturg = 0;
} /* end of netclear */
/*
* netflush
* Send as much data as possible to the network,
* handling requests for urgent data.
*/
void
netflush(void)
{
int n;
extern int not42;
while ((n = nfrontp - nbackp) > 0) {
#if 0
/* XXX This causes output_data() to recurse and die */
DIAG(TD_REPORT, {
n += output_data("td: netflush %d chars\r\n", n);
});
#endif
/*
* if no urgent data, or if the other side appears to be an
* old 4.2 client (and thus unable to survive TCP urgent data),
* write the entire buffer in non-OOB mode.
*/
if ((neturg == 0) || (not42 == 0)) {
n = write(net, nbackp, n); /* normal write */
} else {
n = neturg - nbackp;
/*
* In 4.2 (and 4.3) systems, there is some question about
* what byte in a sendOOB operation is the "OOB" data.
* To make ourselves compatible, we only send ONE byte
* out of band, the one WE THINK should be OOB (though
* we really have more the TCP philosophy of urgent data
* rather than the Unix philosophy of OOB data).
*/
if (n > 1) {
n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */
} else {
n = send(net, nbackp, n, MSG_OOB); /* URGENT data */
}
}
if (n == -1) {
if (errno == EWOULDBLOCK || errno == EINTR)
continue;
cleanup(0);
/* NOTREACHED */
}
nbackp += n;
if (nbackp >= neturg) {
neturg = 0;
}
if (nbackp == nfrontp) {
nbackp = nfrontp = netobuf;
}
}
return;
} /* end of netflush */
/*
* miscellaneous functions doing a variety of little jobs follow ...
*/
void
fatal(int f, const char *msg)
{
char buf[BUFSIZ];
(void) snprintf(buf, sizeof(buf), "telnetd: %s.\r\n", msg);
(void) write(f, buf, (int)strlen(buf));
sleep(1); /*XXX*/
exit(1);
}
void
fatalperror(int f, const char *msg)
{
char buf[BUFSIZ];
(void) snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(errno));
fatal(f, buf);
}
char editedhost[32];
void
edithost(char *pat, char *host)
{
char *res = editedhost;
if (!pat)
pat = strdup("");
while (*pat) {
switch (*pat) {
case '#':
if (*host)
host++;
break;
case '@':
if (*host)
*res++ = *host++;
break;
default:
*res++ = *pat;
break;
}
if (res == &editedhost[sizeof editedhost - 1]) {
*res = '\0';
return;
}
pat++;
}
if (*host)
(void) strncpy(res, host,
sizeof editedhost - (res - editedhost) -1);
else
*res = '\0';
editedhost[sizeof editedhost - 1] = '\0';
}
static char *putlocation;
static void
putstr(const char *s)
{
while (*s)
putchr(*s++);
}
void
putchr(int cc)
{
*putlocation++ = cc;
}
#ifdef __FreeBSD__
static char fmtstr[] = { "%+" };
#else
static char fmtstr[] = { "%l:%M%P on %A, %d %B %Y" };
#endif
void
putf(char *cp, char *where)
{
char *slash;
time_t t;
char db[100];
#ifdef __FreeBSD__
static struct utsname kerninfo;
if (!*kerninfo.sysname)
uname(&kerninfo);
#endif
putlocation = where;
while (*cp) {
if (*cp =='\n') {
putstr("\r\n");
cp++;
continue;
} else if (*cp != '%') {
putchr(*cp++);
continue;
}
switch (*++cp) {
case 't':
#ifdef STREAMSPTY
/* names are like /dev/pts/2 -- we want pts/2 */
slash = strchr(line+1, '/');
#else
slash = strrchr(line, '/');
#endif
if (slash == (char *) 0)
putstr(line);
else
putstr(&slash[1]);
break;
case 'h':
putstr(editedhost);
break;
case 'd':
#ifdef __FreeBSD__
setlocale(LC_TIME, "");
#endif
(void)time(&t);
(void)strftime(db, sizeof(db), fmtstr, localtime(&t));
putstr(db);
break;
#ifdef __FreeBSD__
case 's':
putstr(kerninfo.sysname);
break;
case 'm':
putstr(kerninfo.machine);
break;
case 'r':
putstr(kerninfo.release);
break;
case 'v':
putstr(kerninfo.version);
break;
#endif
case '%':
putchr('%');
break;
}
cp++;
}
}
#ifdef DIAGNOSTICS
/*
* Print telnet options and commands in plain text, if possible.
*/
void
printoption(const char *fmt, int option)
{
if (TELOPT_OK(option))
output_data("%s %s\r\n", fmt, TELOPT(option));
else if (TELCMD_OK(option))
output_data("%s %s\r\n", fmt, TELCMD(option));
else
output_data("%s %d\r\n", fmt, option);
return;
}
void
printsub(char direction, unsigned char *pointer, int length)
{
int i = 0;
if (!(diagnostic & TD_OPTIONS))
return;
if (direction) {
output_data("td: %s suboption ",
direction == '<' ? "recv" : "send");
if (length >= 3) {
int j;
i = pointer[length-2];
j = pointer[length-1];
if (i != IAC || j != SE) {
output_data("(terminated by ");
if (TELOPT_OK(i))
output_data("%s ", TELOPT(i));
else if (TELCMD_OK(i))
output_data("%s ", TELCMD(i));
else
output_data("%d ", i);
if (TELOPT_OK(j))
output_data("%s", TELOPT(j));
else if (TELCMD_OK(j))
output_data("%s", TELCMD(j));
else
output_data("%d", j);
output_data(", not IAC SE!) ");
}
}
length -= 2;
}
if (length < 1) {
output_data("(Empty suboption??\?)");
return;
}
switch (pointer[0]) {
case TELOPT_TTYPE:
output_data("TERMINAL-TYPE ");
switch (pointer[1]) {
case TELQUAL_IS:
output_data("IS \"%.*s\"", length-2, (char *)pointer+2);
break;
case TELQUAL_SEND:
output_data("SEND");
break;
default:
output_data(
"- unknown qualifier %d (0x%x).",
pointer[1], pointer[1]);
}
break;
case TELOPT_TSPEED:
output_data("TERMINAL-SPEED");
if (length < 2) {
output_data(" (empty suboption??\?)");
break;
}
switch (pointer[1]) {
case TELQUAL_IS:
output_data(" IS %.*s", length-2, (char *)pointer+2);
break;
default:
if (pointer[1] == 1)
output_data(" SEND");
else
output_data(" %d (unknown)", pointer[1]);
for (i = 2; i < length; i++) {
output_data(" ?%d?", pointer[i]);
}
break;
}
break;
case TELOPT_LFLOW:
output_data("TOGGLE-FLOW-CONTROL");
if (length < 2) {
output_data(" (empty suboption??\?)");
break;
}
switch (pointer[1]) {
case LFLOW_OFF:
output_data(" OFF"); break;
case LFLOW_ON:
output_data(" ON"); break;
case LFLOW_RESTART_ANY:
output_data(" RESTART-ANY"); break;
case LFLOW_RESTART_XON:
output_data(" RESTART-XON"); break;
default:
output_data(" %d (unknown)", pointer[1]);
}
for (i = 2; i < length; i++) {
output_data(" ?%d?", pointer[i]);
}
break;
case TELOPT_NAWS:
output_data("NAWS");
if (length < 2) {
output_data(" (empty suboption??\?)");
break;
}
if (length == 2) {
output_data(" ?%d?", pointer[1]);
break;
}
output_data(" %d %d (%d)",
pointer[1], pointer[2],
(int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
if (length == 4) {
output_data(" ?%d?", pointer[3]);
break;
}
output_data(" %d %d (%d)",
pointer[3], pointer[4],
(int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
for (i = 5; i < length; i++) {
output_data(" ?%d?", pointer[i]);
}
break;
case TELOPT_LINEMODE:
output_data("LINEMODE ");
if (length < 2) {
output_data(" (empty suboption??\?)");
break;
}
switch (pointer[1]) {
case WILL:
output_data("WILL ");
goto common;
case WONT:
output_data("WONT ");
goto common;
case DO:
output_data("DO ");
goto common;
case DONT:
output_data("DONT ");
common:
if (length < 3) {
output_data("(no option??\?)");
break;
}
switch (pointer[2]) {
case LM_FORWARDMASK:
output_data("Forward Mask");
for (i = 3; i < length; i++) {
output_data(" %x", pointer[i]);
}
break;
default:
output_data("%d (unknown)", pointer[2]);
for (i = 3; i < length; i++) {
output_data(" %d", pointer[i]);
}
break;
}
break;
case LM_SLC:
output_data("SLC");
for (i = 2; i < length - 2; i += 3) {
if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
output_data(" %s", SLC_NAME(pointer[i+SLC_FUNC]));
else
output_data(" %d", pointer[i+SLC_FUNC]);
switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
case SLC_NOSUPPORT:
output_data(" NOSUPPORT"); break;
case SLC_CANTCHANGE:
output_data(" CANTCHANGE"); break;
case SLC_VARIABLE:
output_data(" VARIABLE"); break;
case SLC_DEFAULT:
output_data(" DEFAULT"); break;
}
output_data("%s%s%s",
pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
SLC_FLUSHOUT| SLC_LEVELBITS)) {
output_data("(0x%x)", pointer[i+SLC_FLAGS]);
}
output_data(" %d;", pointer[i+SLC_VALUE]);
if ((pointer[i+SLC_VALUE] == IAC) &&
(pointer[i+SLC_VALUE+1] == IAC))
i++;
}
for (; i < length; i++) {
output_data(" ?%d?", pointer[i]);
}
break;
case LM_MODE:
output_data("MODE ");
if (length < 3) {
output_data("(no mode??\?)");
break;
}
{
char tbuf[32];
sprintf(tbuf, "%s%s%s%s%s",
pointer[2]&MODE_EDIT ? "|EDIT" : "",
pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
pointer[2]&MODE_ACK ? "|ACK" : "");
output_data("%s", tbuf[1] ? &tbuf[1] : "0");
}
if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
output_data(" (0x%x)", pointer[2]);
}
for (i = 3; i < length; i++) {
output_data(" ?0x%x?", pointer[i]);
}
break;
default:
output_data("%d (unknown)", pointer[1]);
for (i = 2; i < length; i++) {
output_data(" %d", pointer[i]);
}
}
break;
case TELOPT_STATUS: {
const char *cp;
int j, k;
output_data("STATUS");
switch (pointer[1]) {
default:
if (pointer[1] == TELQUAL_SEND)
output_data(" SEND");
else
output_data(" %d (unknown)", pointer[1]);
for (i = 2; i < length; i++) {
output_data(" ?%d?", pointer[i]);
}
break;
case TELQUAL_IS:
output_data(" IS\r\n");
for (i = 2; i < length; i++) {
switch(pointer[i]) {
case DO: cp = "DO"; goto common2;
case DONT: cp = "DONT"; goto common2;
case WILL: cp = "WILL"; goto common2;
case WONT: cp = "WONT"; goto common2;
common2:
i++;
if (TELOPT_OK(pointer[i]))
output_data(" %s %s", cp, TELOPT(pointer[i]));
else
output_data(" %s %d", cp, pointer[i]);
output_data("\r\n");
break;
case SB:
output_data(" SB ");
i++;
j = k = i;
while (j < length) {
if (pointer[j] == SE) {
if (j+1 == length)
break;
if (pointer[j+1] == SE)
j++;
else
break;
}
pointer[k++] = pointer[j++];
}
printsub(0, &pointer[i], k - i);
if (i < length) {
output_data(" SE");
i = j;
} else
i = j - 1;
output_data("\r\n");
break;
default:
output_data(" %d", pointer[i]);
break;
}
}
break;
}
break;
}
case TELOPT_XDISPLOC:
output_data("X-DISPLAY-LOCATION ");
switch (pointer[1]) {
case TELQUAL_IS:
output_data("IS \"%.*s\"", length-2, (char *)pointer+2);
break;
case TELQUAL_SEND:
output_data("SEND");
break;
default:
output_data("- unknown qualifier %d (0x%x).",
pointer[1], pointer[1]);
}
break;
case TELOPT_NEW_ENVIRON:
output_data("NEW-ENVIRON ");
goto env_common1;
case TELOPT_OLD_ENVIRON:
output_data("OLD-ENVIRON");
env_common1:
switch (pointer[1]) {
case TELQUAL_IS:
output_data("IS ");
goto env_common;
case TELQUAL_SEND:
output_data("SEND ");
goto env_common;
case TELQUAL_INFO:
output_data("INFO ");
env_common:
{
int noquote = 2;
for (i = 2; i < length; i++ ) {
switch (pointer[i]) {
case NEW_ENV_VAR:
output_data("\" VAR " + noquote);
noquote = 2;
break;
case NEW_ENV_VALUE:
output_data("\" VALUE " + noquote);
noquote = 2;
break;
case ENV_ESC:
output_data("\" ESC " + noquote);
noquote = 2;
break;
case ENV_USERVAR:
output_data("\" USERVAR " + noquote);
noquote = 2;
break;
default:
if (isprint(pointer[i]) && pointer[i] != '"') {
if (noquote) {
output_data("\"");
noquote = 0;
}
output_data("%c", pointer[i]);
} else {
output_data("\" %03o " + noquote,
pointer[i]);
noquote = 2;
}
break;
}
}
if (!noquote)
output_data("\"");
break;
}
}
break;
default:
if (TELOPT_OK(pointer[0]))
output_data("%s (unknown)", TELOPT(pointer[0]));
else
output_data("%d (unknown)", pointer[i]);
for (i = 1; i < length; i++) {
output_data(" %d", pointer[i]);
}
break;
}
output_data("\r\n");
}
/*
* Dump a data buffer in hex and ascii to the output data stream.
*/
void
printdata(const char *tag, char *ptr, int cnt)
{
int i;
char xbuf[30];
while (cnt) {
/* flush net output buffer if no room for new data) */
if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
netflush();
}
/* add a line of output */
output_data("%s: ", tag);
for (i = 0; i < 20 && cnt; i++) {
output_data("%02x", *ptr);
if (isprint(*ptr)) {
xbuf[i] = *ptr;
} else {
xbuf[i] = '.';
}
if (i % 2) {
output_data(" ");
}
cnt--;
ptr++;
}
xbuf[i] = '\0';
output_data(" %s\r\n", xbuf );
}
}
#endif /* DIAGNOSTICS */
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