libwrap from tcp_wrappers 7.6
This commit is contained in:
parent
bcf1e2dcad
commit
fa8f6ba80b
|
@ -0,0 +1,86 @@
|
|||
/*
|
||||
* percent_x() takes a string and performs %<char> expansions. It aborts the
|
||||
* program when the expansion would overflow the output buffer. The result
|
||||
* of %<char> expansion may be passed on to a shell process. For this
|
||||
* reason, characters with a special meaning to shells are replaced by
|
||||
* underscores.
|
||||
*
|
||||
* Diagnostics are reported through syslog(3).
|
||||
*
|
||||
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
|
||||
*/
|
||||
|
||||
#ifndef lint
|
||||
static char sccsid[] = "@(#) percent_x.c 1.4 94/12/28 17:42:37";
|
||||
#endif
|
||||
|
||||
/* System libraries. */
|
||||
|
||||
#include <stdio.h>
|
||||
#include <syslog.h>
|
||||
#include <string.h>
|
||||
|
||||
extern void exit();
|
||||
|
||||
/* Local stuff. */
|
||||
|
||||
#include "tcpd.h"
|
||||
|
||||
/* percent_x - do %<char> expansion, abort if result buffer is too small */
|
||||
|
||||
char *percent_x(result, result_len, string, request)
|
||||
char *result;
|
||||
int result_len;
|
||||
char *string;
|
||||
struct request_info *request;
|
||||
{
|
||||
char *bp = result;
|
||||
char *end = result + result_len - 1; /* end of result buffer */
|
||||
char *expansion;
|
||||
int expansion_len;
|
||||
static char ok_chars[] = "1234567890!@%-_=+:,./\
|
||||
abcdefghijklmnopqrstuvwxyz\
|
||||
ABCDEFGHIJKLMNOPQRSTUVWXYZ";
|
||||
char *str = string;
|
||||
char *cp;
|
||||
int ch;
|
||||
|
||||
/*
|
||||
* Warning: we may be called from a child process or after pattern
|
||||
* matching, so we cannot use clean_exit() or tcpd_jump().
|
||||
*/
|
||||
|
||||
while (*str) {
|
||||
if (*str == '%' && (ch = str[1]) != 0) {
|
||||
str += 2;
|
||||
expansion =
|
||||
ch == 'a' ? eval_hostaddr(request->client) :
|
||||
ch == 'A' ? eval_hostaddr(request->server) :
|
||||
ch == 'c' ? eval_client(request) :
|
||||
ch == 'd' ? eval_daemon(request) :
|
||||
ch == 'h' ? eval_hostinfo(request->client) :
|
||||
ch == 'H' ? eval_hostinfo(request->server) :
|
||||
ch == 'n' ? eval_hostname(request->client) :
|
||||
ch == 'N' ? eval_hostname(request->server) :
|
||||
ch == 'p' ? eval_pid(request) :
|
||||
ch == 's' ? eval_server(request) :
|
||||
ch == 'u' ? eval_user(request) :
|
||||
ch == '%' ? "%" : (tcpd_warn("unrecognized %%%c", ch), "");
|
||||
for (cp = expansion; *(cp += strspn(cp, ok_chars)); /* */ )
|
||||
*cp = '_';
|
||||
expansion_len = cp - expansion;
|
||||
} else {
|
||||
expansion = str++;
|
||||
expansion_len = 1;
|
||||
}
|
||||
if (bp + expansion_len >= end) {
|
||||
tcpd_warn("percent_x: expansion too long: %.30s...", result);
|
||||
sleep(5);
|
||||
exit(0);
|
||||
}
|
||||
memcpy(bp, expansion, expansion_len);
|
||||
bp += expansion_len;
|
||||
}
|
||||
*bp = 0;
|
||||
return (result);
|
||||
}
|
Loading…
Reference in New Issue