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HardenedBSD/usr.sbin/ppp/chat.c
Brian Somers 6ed9fb2fc9 De-couple ppp from libalias. If libalias isn't there, the 
alias commands simply won't work.  Only root may specify the
location of the alias lib (otherwise, it's hard-coded).

Make logprintf silently fail if LogOpen hasn't been called.

Suggested by:	eivind
1997-05-26 00:44:10 +00:00

620 lines
13 KiB
C
Raw Blame History

/*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Most of codes are derived from chat.c by Karl Fox (karl@MorningStar.Com).
*
* Chat -- a program for automatic session establishment (i.e. dial
* the phone and log in).
*
* This software is in the public domain.
*
* Please send all bug reports, requests for information, etc. to:
*
* Karl Fox <karl@MorningStar.Com>
* Morning Star Technologies, Inc.
* 1760 Zollinger Road
* Columbus, OH 43221
* (614)451-1883
*
* $Id: chat.c,v 1.24 1997/05/10 01:22:07 brian Exp $
*
* TODO:
* o Support more UUCP compatible control sequences.
* o Dialing shoud not block monitor process.
* o Reading modem by select should be unified into main.c
*/
#include "defs.h"
#include <ctype.h>
#include <sys/uio.h>
#ifndef isblank
#define isblank(c) ((c) == '\t' || (c) == ' ')
#endif
#include <sys/time.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include "timeout.h"
#include "loadalias.h"
#include "vars.h"
#include "chat.h"
#include "sig.h"
#include "chat.h"
#define IBSIZE 200
static int TimeoutSec;
static int abort_next, timeout_next;
static int numaborts;
char *AbortStrings[50];
char inbuff[IBSIZE*2+1];
extern int ChangeParity(char *);
#define MATCH 1
#define NOMATCH 0
#define ABORT -1
static char *
findblank(p, instring)
char *p;
int instring;
{
if (instring) {
while (*p) {
if (*p == '\\') {
strcpy(p, p + 1);
if (!*p)
break;
} else if (*p == '"')
return(p);
p++;
}
} else {
while (*p) {
if (isblank(*p))
return(p);
p++;
}
}
return p;
}
int
MakeArgs(script, pvect, maxargs)
char *script;
char **pvect;
int maxargs;
{
int nargs, nb;
int instring;
nargs = 0;
while (*script) {
nb = strspn(script, " \t");
script += nb;
if (*script) {
if (*script == '"') {
instring = 1;
script++;
if (*script == '\0')
break; /* Shouldn't return here. Need to null terminate below */
} else
instring = 0;
if (nargs >= maxargs-1)
break;
*pvect++ = script;
nargs++;
script = findblank(script, instring);
if (*script)
*script++ = '\0';
}
}
*pvect = NULL;
return nargs;
}
/*
* \c don't add a cr
* \d Sleep a little (delay 2 seconds
* \n Line feed character
* \P Auth Key password
* \p pause 0.25 sec
* \r Carrige return character
* \s Space character
* \T Telephone number(s) (defined via `set phone')
* \t Tab character
* \U Auth User
*/
char *
ExpandString(str, result, reslen, sendmode)
char *str;
char *result;
int reslen;
int sendmode;
{
int addcr = 0;
char *phone;
result[--reslen] = '\0';
if (sendmode)
addcr = 1;
while (*str && reslen > 0) {
switch (*str) {
case '\\':
str++;
switch (*str) {
case 'c':
if (sendmode)
addcr = 0;
break;
case 'd': /* Delay 2 seconds */
sleep(2); break;
case 'p':
usleep(250000); break; /* Pause 0.25 sec */
case 'n':
*result++ = '\n'; reslen--; break;
case 'r':
*result++ = '\r'; reslen--; break;
case 's':
*result++ = ' '; reslen--; break;
case 't':
*result++ = '\t'; reslen--; break;
case 'P':
strncpy(result, VarAuthKey, reslen);
reslen -= strlen(result);
result += strlen(result);
break;
case 'T':
if (VarNextPhone == NULL) {
strcpy(VarPhoneCopy, VarPhoneList);
VarNextPhone = VarPhoneCopy;
}
phone = strsep(&VarNextPhone, ":");
strncpy(result, phone, reslen);
reslen -= strlen(result);
result += strlen(result);
if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER)
fprintf(stderr, "Phone: %s\n", phone);
LogPrintf(LOG_PHASE_BIT, "Phone: %s\n", phone);
break;
case 'U':
strncpy(result, VarAuthName, reslen);
reslen -= strlen(result);
result += strlen(result);
break;
default:
reslen--;
*result++ = *str;
break;
}
if (*str)
str++;
break;
case '^':
str++;
if (*str) {
*result++ = *str++ & 0x1f;
reslen--;
}
break;
default:
*result++ = *str++;
reslen--;
break;
}
}
if (--reslen > 0) {
if (addcr)
*result++ = '\r';
}
if (--reslen > 0)
*result++ = '\0';
return(result);
}
#define MAXLOGBUFF 200
static char logbuff[MAXLOGBUFF];
static int loglen = 0;
static void clear_log() {
memset(logbuff,0,MAXLOGBUFF);
loglen = 0;
}
static void flush_log() {
if ((loglevel & LOG_CONNECT_BIT)
|| ((loglevel & LOG_CARRIER_BIT)
&& strstr(logbuff,"CARRIER"))) {
LogPrintf(LOG_CONNECT_BIT|LOG_CARRIER_BIT,"Chat: %s\n",logbuff);
}
clear_log();
}
static void connect_log(char *str, int single_p) {
int space = MAXLOGBUFF - loglen - 1;
while (space--) {
if (*str == '\n') {
flush_log();
} else {
logbuff[loglen++] = *str;
}
if (single_p || !*++str) break;
}
if (!space) flush_log();
}
int
WaitforString(estr)
char *estr;
{
struct timeval timeout;
char *s, *str, ch;
char *inp;
fd_set rfds;
int i, nfds, nb;
char buff[IBSIZE];
#ifdef SIGALRM
int omask;
omask = sigblock(sigmask(SIGALRM));
#endif
clear_log();
(void) ExpandString(estr, buff, sizeof(buff), 0);
LogPrintf(LOG_CHAT_BIT, "Wait for (%d): %s --> %s\n", TimeoutSec, estr, buff);
str = buff;
inp = inbuff;
if (strlen(str)>=IBSIZE){
str[IBSIZE-1]=0;
LogPrintf(LOG_CHAT_BIT, "Truncating String to %d character: %s\n", IBSIZE, str);
}
nfds = modem + 1;
s = str;
for (;;) {
FD_ZERO(&rfds);
FD_SET(modem, &rfds);
/*
* Because it is not clear whether select() modifies timeout value,
* it is better to initialize timeout values everytime.
*/
timeout.tv_sec = TimeoutSec;
timeout.tv_usec = 0;
i = select(nfds, &rfds, NULL, NULL, &timeout);
#ifdef notdef
TimerService();
#endif
if (i < 0) {
#ifdef SIGALRM
if (errno == EINTR)
continue;
sigsetmask(omask);
#endif
perror("select");
*inp = 0;
return(NOMATCH);
} else if (i == 0) { /* Timeout reached! */
*inp = 0;
if (inp != inbuff)
LogPrintf(LOG_CHAT_BIT, "got: %s\n", inbuff);
LogPrintf(LOG_CHAT_BIT, "can't get (%d).\n", timeout.tv_sec);
#ifdef SIGALRM
sigsetmask(omask);
#endif
return(NOMATCH);
}
if (FD_ISSET(modem, &rfds)) { /* got something */
if (DEV_IS_SYNC) {
int length;
if ((length=strlen(inbuff))>IBSIZE){
bcopy(&(inbuff[IBSIZE]),inbuff,IBSIZE+1); /* shuffle down next part*/
length=strlen(inbuff);
}
nb = read(modem, &(inbuff[length]), IBSIZE);
inbuff[nb + length] = 0;
connect_log(inbuff,0);
if (strstr(inbuff, str)) {
#ifdef SIGALRM
sigsetmask(omask);
#endif
flush_log();
return(MATCH);
}
for (i = 0; i < numaborts; i++) {
if (strstr(inbuff, AbortStrings[i])) {
LogPrintf(LOG_CHAT_BIT, "Abort: %s\n", AbortStrings[i]);
#ifdef SIGALRM
sigsetmask(omask);
#endif
flush_log();
return(ABORT);
}
}
} else {
if (read(modem, &ch, 1) < 0) {
perror("read error");
*inp = '\0';
return(NOMATCH);
}
connect_log(&ch,1);
*inp++ = ch;
if (ch == *s) {
s++;
if (*s == '\0') {
#ifdef SIGALRM
sigsetmask(omask);
#endif
*inp = 0;
flush_log();
return(MATCH);
}
} else {
s = str;
if (inp == inbuff+ IBSIZE) {
bcopy(inp - 100, inbuff, 100);
inp = inbuff + 100;
}
for (i = 0; i < numaborts; i++) { /* Look for Abort strings */
int len;
char *s1;
s1 = AbortStrings[i];
len = strlen(s1);
if ((len <= inp - inbuff) && (strncmp(inp - len, s1, len) == 0)) {
LogPrintf(LOG_CHAT_BIT, "Abort: %s\n", s1);
*inp = 0;
#ifdef SIGALRM
sigsetmask(omask);
#endif
flush_log();
return(ABORT);
}
}
}
}
}
}
}
void
ExecStr(command, out)
char *command, *out;
{
int pid;
int fids[2];
char *vector[20];
int stat, nb;
char *cp;
char tmp[300];
extern int errno;
cp = inbuff + strlen(inbuff) - 1;
while (cp > inbuff) {
if (*cp < ' ' && *cp != '\t') {
cp++;
break;
}
cp--;
}
if (snprintf(tmp, sizeof tmp, "%s %s", command, cp) >= sizeof tmp) {
LogPrintf(LOG_CHAT_BIT, "Too long string to ExecStr: \"%s\"\n",
command);
return;
}
(void) MakeArgs(tmp, vector, VECSIZE(vector));
if (pipe(fids) < 0) {
LogPrintf(LOG_CHAT_BIT, "Unable to create pipe in ExecStr: %s\n",
strerror(errno));
return;
}
pid = fork();
if (pid == 0) {
TermTimerService();
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGALRM, SIG_DFL);
close(fids[0]);
if (dup2(fids[1], 1) < 0) {
LogPrintf(LOG_CHAT_BIT, "dup2(fids[1], 1) in ExecStr: %s\n",
strerror(errno));
return;
}
close(fids[1]);
nb = open("/dev/tty", O_RDWR);
if (dup2(nb, 0) < 0) {
LogPrintf(LOG_CHAT_BIT, "dup2(nb, 0) in ExecStr: %s\n",
strerror(errno));
return;
}
LogPrintf(LOG_CHAT_BIT, "exec: %s\n", command);
/* switch back to original privileges */
if (setgid(getgid()) < 0) {
LogPrintf(LOG_CHAT_BIT, "setgid: %s\n", strerror(errno));
exit(1);
}
if (setuid(getuid()) < 0) {
LogPrintf(LOG_CHAT_BIT, "setuid: %s\n", strerror(errno));
exit(1);
}
pid = execvp(command, vector);
LogPrintf(LOG_CHAT_BIT, "execvp failed for (%d/%d): %s\n", pid, errno, command);
exit(127);
} else {
close(fids[1]);
for (;;) {
nb = read(fids[0], out, 1);
if (nb <= 0)
break;
out++;
}
*out = '\0';
close(fids[0]);
close(fids[1]);
waitpid(pid, &stat, WNOHANG);
}
}
void
SendString(str)
char *str;
{
char *cp;
int on;
char buff[200];
if (abort_next) {
abort_next = 0;
ExpandString(str, buff, sizeof(buff), 0);
AbortStrings[numaborts++] = strdup(buff);
} else if (timeout_next) {
timeout_next = 0;
TimeoutSec = atoi(str);
if (TimeoutSec <= 0)
TimeoutSec = 30;
} else {
if (*str == '!') {
(void) ExpandString(str+1, buff+2, sizeof(buff)-2, 0);
ExecStr(buff + 2, buff + 2);
} else {
(void) ExpandString(str, buff+2, sizeof(buff)-2, 1);
}
if (strstr(str, "\\P")) { /* Do not log the password itself. */
LogPrintf(LOG_CHAT_BIT, "sending: %s\n", str);
} else {
LogPrintf(LOG_CHAT_BIT, "sending: %s\n", buff+2);
}
cp = buff;
if (DEV_IS_SYNC)
bcopy("\377\003", buff, 2); /* Prepend HDLC header */
else
cp += 2;
on = strlen(cp);
write(modem, cp, on);
}
}
int
ExpectString(str)
char *str;
{
char *minus;
int state;
if (strcmp(str, "ABORT") == 0) {
++abort_next;
return(MATCH);
}
if (strcmp(str, "TIMEOUT") == 0) {
++timeout_next;
return(MATCH);
}
LogPrintf(LOG_CHAT_BIT, "Expecting %s\n", str);
while (*str) {
/*
* Check whether if string contains sub-send-expect.
*/
for (minus = str; *minus; minus++) {
if (*minus == '-') {
if (minus == str || minus[-1] != '\\')
break;
}
}
if (*minus == '-') { /* We have sub-send-expect. */
*minus++ = '\0';
state = WaitforString(str);
if (state != NOMATCH)
return(state);
/*
* Can't get expect string. Sendout send part.
*/
str = minus;
for (minus = str; *minus; minus++) {
if (*minus == '-') {
if (minus == str || minus[-1] != '\\')
break;
}
}
if (*minus == '-') {
*minus++ = '\0';
SendString(str);
str = minus;
} else {
SendString(str);
return(MATCH);
}
} else {
/*
* Simple case. Wait for string.
*/
return(WaitforString(str));
}
}
return(MATCH);
}
int
DoChat(script)
char *script;
{
char *vector[40];
char **argv;
int argc, n, state;
#ifdef DEBUG
int i;
#endif
timeout_next = abort_next = 0;
for (n = 0; AbortStrings[n]; n++) {
free(AbortStrings[n]);
AbortStrings[n] = NULL;
}
numaborts = 0;
bzero(vector, sizeof(vector));
n = MakeArgs(script, vector, VECSIZE(vector));
#ifdef DEBUG
logprintf("n = %d\n", n);
for (i = 0; i < n; i++)
logprintf(" %s\n", vector[i]);
#endif
argc = n;
argv = vector;
TimeoutSec = 30;
while (*argv) {
if (strcmp(*argv, "P_ZERO") == 0 ||
strcmp(*argv, "P_ODD") == 0 || strcmp(*argv, "P_EVEN") == 0) {
ChangeParity(*argv++);
continue;
}
state = ExpectString(*argv++);
switch (state) {
case MATCH:
if (*argv)
SendString(*argv++);
break;
case ABORT:
#ifdef notdef
HangupModem();
#endif
case NOMATCH:
return(NOMATCH);
}
}
return(MATCH);
}
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