diff options
Diffstat (limited to 'libexec/telnetd/utility.c')
| -rw-r--r-- | libexec/telnetd/utility.c | 900 |
1 files changed, 0 insertions, 900 deletions
diff --git a/libexec/telnetd/utility.c b/libexec/telnetd/utility.c deleted file mode 100644 index 042b248..0000000 --- a/libexec/telnetd/utility.c +++ /dev/null @@ -1,900 +0,0 @@ -/* - * 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. - */ - -#if 0 -#ifndef lint -static const char sccsid[] = "@(#)utility.c 8.4 (Berkeley) 5/30/95"; -#endif /* not lint */ -#endif -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#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 */ |
