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Here is a patch for a little bug in the WaitForString routine. The problem

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is when the matched string spans the end of the inbuff.  This fix allocates
twice the IBSIZE so that it can keep the last and the current text to search
in the inbuff so that the match won't fail if it gets truncated by the read.

It also warns if the search string is to long and truncates it.

Submitted by: Dough Ambrisco <ambrisco@ambrisco.roble.com>
This commit is contained in:
Andrey A. Chernov 1996-04-06 02:00:17 +00:00
parent b897ddafe5
commit 81cc95f2a7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=15070
1 changed files with 14 additions and 4 deletions
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18
usr.sbin/ppp/chat.c
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@ -18,7 +18,7 @@
* Columbus, OH 43221
* (614)451-1883
*
* $Id: chat.c,v 1.7 1996/03/08 12:34:37 ache Exp $
* $Id: chat.c,v 1.8 1996/03/08 13:22:21 ache Exp $
*
* TODO:
* o Support more UUCP compatible control sequences.
@ -45,7 +45,7 @@ static int TimeoutSec;
static int abort_next, timeout_next;
static int numaborts;
char *AbortStrings[50];
char inbuff[IBSIZE];
char inbuff[IBSIZE*2+1];
extern int ChangeParity(char *);
@ -209,6 +209,11 @@ char *estr;
str = buff;
inp = inbuff;
if (strlen(str)>=IBSIZE){
str[IBSIZE]=0;
LogPrintf(LOG_CHAT, "Truncating String to %d character: %s\n", IBSIZE, str);
}
nfds = modem + 1;
s = str;
for (;;) {
@ -245,8 +250,13 @@ char *estr;
}
if (FD_ISSET(modem, &rfds)) { /* got something */
if (DEV_IS_SYNC) {
nb = read(modem, inbuff, IBSIZE-1);
inbuff[nb] = 0;
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;
if (strstr(inbuff, str)) {
#ifdef SIGALRM
sigsetmask(omask);