diff options
Diffstat (limited to 'usr.sbin/sendmail/src/util.c')
| -rw-r--r-- | usr.sbin/sendmail/src/util.c | 82 |
1 files changed, 81 insertions, 1 deletions
diff --git a/usr.sbin/sendmail/src/util.c b/usr.sbin/sendmail/src/util.c index 10b3fb4..0e68673 100644 --- a/usr.sbin/sendmail/src/util.c +++ b/usr.sbin/sendmail/src/util.c @@ -33,7 +33,7 @@ */ #ifndef lint -static char sccsid[] = "@(#)util.c 8.39 (Berkeley) 4/14/94"; +static char sccsid[] = "@(#)util.c 8.39.1.2 (Berkeley) 2/10/95"; #endif /* not lint */ # include "sendmail.h" @@ -1465,3 +1465,83 @@ shortenstring(s, m) strcpy(buf + m + 3, s + l - m); return buf; } + /* +** CLEANSTRCPY -- copy string keeping out bogus characters +** +** Parameters: +** t -- "to" string. +** f -- "from" string. +** l -- length of space available in "to" string. +** +** Returns: +** none. +*/ + +void +cleanstrcpy(t, f, l) + register char *t; + register char *f; + int l; +{ +#ifdef LOG + /* check for newlines and log if necessary */ + (void) denlstring(f); +#endif + + l--; + while (l > 0 && *f != '\0') + { + if (isascii(*f) && + (isalnum(*f) || strchr("!#$%&'*+-./^_`{|}~", *f) != NULL)) + { + l--; + *t++ = *f; + } + f++; + } + *t = '\0'; +} + /* +** DENLSTRING -- convert newlines in a string to spaces +** +** Parameters: +** s -- the input string +** +** Returns: +** A pointer to a version of the string with newlines +** mapped to spaces. This should be copied. +*/ + +char * +denlstring(s) + char *s; +{ + register char *p; + int l; + static char *bp = NULL; + static int bl = 0; + + if (strchr(s, '\n') == NULL) + return s; + + l = strlen(s) + 1; + if (bl < l) + { + /* allocate more space */ + if (bp != NULL) + free(bp); + bp = xalloc(l); + bl = l; + } + strcpy(bp, s); + for (p = bp; (p = strchr(p, '\n')) != NULL; ) + *p++ = ' '; + +#ifdef LOG + p = macvalue('_', CurEnv); + syslog(LOG_ALERT, "POSSIBLE ATTACK from %s: newline in string \"%s\"", + p == NULL ? "[UNKNOWN]" : p, bp); +#endif + + return bp; +} |
