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/* $OpenBSD: scaffold.c,v 1.2 1999/06/06 15:34:57 deraadt Exp $ */
/*
* Routines for testing only. Not really industrial strength.
*
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
*/
#ifndef lint
#if 0
static char sccs_id[] = "@(#) scaffold.c 1.5 95/01/03 09:13:48";
#else
static char rcsid[] = "$OpenBSD: scaffold.c,v 1.2 1999/06/06 15:34:57 deraadt Exp $";
#endif
#endif
/* System libraries. */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <syslog.h>
#include <setjmp.h>
#include <string.h>
#include <stdlib.h>
#include <tcpd.h>
#ifndef INADDR_NONE
#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
#endif
/* Application-specific. */
#include "scaffold.h"
/*
* These are referenced by the options module and by rfc931.c.
*/
int allow_severity = SEVERITY;
int deny_severity = LOG_WARNING;
int rfc931_timeout = RFC931_TIMEOUT;
/* dup_hostent - create hostent in one memory block */
static struct hostent *dup_hostent(hp)
struct hostent *hp;
{
struct hostent_block {
struct hostent host;
char *addr_list[1];
};
struct hostent_block *hb;
int count;
char *data;
char *addr;
for (count = 0; hp->h_addr_list[count] != 0; count++)
/* void */ ;
if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block)
+ (hp->h_length + sizeof(char *)) * count)) == 0) {
fprintf(stderr, "Sorry, out of memory\n");
exit(1);
}
memset((char *) &hb->host, 0, sizeof(hb->host));
hb->host.h_length = hp->h_length;
hb->host.h_addr_list = hb->addr_list;
hb->host.h_addr_list[count] = 0;
data = (char *) (hb->host.h_addr_list + count + 1);
for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
hb->host.h_addr_list[count] = data + hp->h_length * count;
memcpy(hb->host.h_addr_list[count], addr, hp->h_length);
}
return (&hb->host);
}
/* find_inet_addr - find all addresses for this host, result to free() */
struct hostent *find_inet_addr(host)
char *host;
{
struct in_addr addr;
struct hostent *hp;
static struct hostent h;
static char *addr_list[2];
/*
* Host address: translate it to internal form.
*/
if (dot_quad_addr(host, &addr.s_addr)) {
h.h_addr_list = addr_list;
h.h_addr_list[0] = (char *) &addr;
h.h_length = sizeof(addr);
return (dup_hostent(&h));
}
/*
* Map host name to a series of addresses. Watch out for non-internet
* forms or aliases. The NOT_INADDR() is here in case gethostbyname() has
* been "enhanced" to accept numeric addresses. Make a copy of the
* address list so that later gethostbyXXX() calls will not clobber it.
*/
if (NOT_INADDR(host) == 0) {
tcpd_warn("%s: not an internet address", host);
return (0);
}
if ((hp = gethostbyname(host)) == 0) {
tcpd_warn("%s: host not found", host);
return (0);
}
if (hp->h_addrtype != AF_INET) {
tcpd_warn("%d: not an internet host", hp->h_addrtype);
return (0);
}
if (STR_NE(host, hp->h_name)) {
tcpd_warn("%s: hostname alias", host);
tcpd_warn("(official name: %s)", hp->h_name);
}
return (dup_hostent(hp));
}
/* check_dns - give each address thorough workout, return address count */
int check_dns(host)
char *host;
{
struct request_info request;
struct sockaddr_in sin;
struct hostent *hp;
int count;
char *addr;
if ((hp = find_inet_addr(host)) == 0)
return (0);
request_init(&request, RQ_CLIENT_SIN, &sin, 0);
sock_methods(&request);
memset((char *) &sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
memcpy((char *) &sin.sin_addr, addr, sizeof(sin.sin_addr));
/*
* Force host name and address conversions. Use the request structure
* as a cache. Detect hostname lookup problems. Any name/name or
* name/address conflicts will be reported while eval_hostname() does
* its job.
*/
request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0);
if (STR_EQ(eval_hostname(request.client), unknown))
tcpd_warn("host address %s->name lookup failed",
eval_hostaddr(request.client));
}
free((char *) hp);
return (count);
}
/* dummy function to intercept the real shell_cmd() */
/* ARGSUSED */
void shell_cmd(command)
char *command;
{
if (hosts_access_verbose)
printf("command: %s", command);
}
/* dummy function to intercept the real clean_exit() */
/* ARGSUSED */
void clean_exit(request)
struct request_info *request;
{
exit(0);
}
/* dummy function to intercept the real rfc931() */
/* ARGSUSED */
void rfc931(a1, a2, d1)
struct sockaddr_in *a1, *a2;
char *d1;
{
}
/* check_path - examine accessibility */
int check_path(path, st)
char *path;
struct stat *st;
{
struct stat stbuf;
char buf[BUFSIZ];
if (stat(path, st) < 0)
return (-1);
#ifdef notdef
if (st->st_uid != 0)
tcpd_warn("%s: not owned by root", path);
if (st->st_mode & 020)
tcpd_warn("%s: group writable", path);
#endif
if (st->st_mode & 002)
tcpd_warn("%s: world writable", path);
if (path[0] == '/' && path[1] != 0) {
strrchr(strcpy(buf, path), '/')[0] = 0;
(void) check_path(buf[0] ? buf : "/", &stbuf);
}
return (0);
}
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