144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/* $NetBSD: eval.c,v 1.7 2012/03/21 10:10:37 matt Exp $ */
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/*
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* Routines for controlled evaluation of host names, user names, and so on.
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* They are, in fact, wrappers around the functions that are specific for
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* the sockets or TLI programming interfaces. The request_info and host_info
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* structures are used for result cacheing.
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*
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* These routines allows us to postpone expensive operations until their
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* results are really needed. Examples are hostname lookups and double
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* checks, or username lookups. Information that cannot be retrieved is
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* given the value "unknown" ("paranoid" in case of hostname problems).
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*
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* When ALWAYS_HOSTNAME is off, hostname lookup is done only when required by
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* tcpd paranoid mode, by access control patterns, or by %letter expansions.
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*
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* When ALWAYS_RFC931 mode is off, user lookup is done only when required by
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* access control patterns or %letter expansions.
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#) eval.c 1.3 95/01/30 19:51:45";
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#else
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__RCSID("$NetBSD: eval.c,v 1.7 2012/03/21 10:10:37 matt Exp $");
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#endif
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#endif
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/* System libraries. */
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#include <stdio.h>
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#include <string.h>
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/* Local stuff. */
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#include "tcpd.h"
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/*
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* When a string has the value STRING_UNKNOWN, it means: don't bother, I
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* tried to look up the data but it was unavailable for some reason. When a
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* host name has the value STRING_PARANOID it means there was a name/address
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* conflict.
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*/
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char unknown[] = STRING_UNKNOWN;
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char paranoid[] = STRING_PARANOID;
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/* eval_user - look up user name */
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char *
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eval_user(struct request_info *request)
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{
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if (request->user[0] == 0) {
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(void)strlcpy(request->user, unknown, sizeof(request->user));
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if (request->sink == 0 && request->client->sin && request->server->sin)
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rfc931(request->client->sin, request->server->sin, request->user);
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}
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return (request->user);
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}
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/* eval_hostaddr - look up printable address */
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char *
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eval_hostaddr(struct host_info *host)
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{
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if (host->addr[0] == 0) {
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(void)strlcpy(host->addr, unknown, sizeof(host->addr));
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if (host->request->hostaddr != 0)
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host->request->hostaddr(host);
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}
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return (host->addr);
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}
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/* eval_hostname - look up host name */
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char *
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eval_hostname(struct host_info *host)
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{
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if (host->name[0] == 0) {
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(void)strlcpy(host->name, unknown, sizeof(host->name));
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if (host->request->hostname != 0)
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host->request->hostname(host);
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}
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return (host->name);
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}
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/* eval_hostinfo - return string with host name (preferred) or address */
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char *
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eval_hostinfo(struct host_info *host)
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{
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char *hostname;
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#ifndef ALWAYS_HOSTNAME /* no implicit host lookups */
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if (host->name[0] == 0)
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return (eval_hostaddr(host));
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#endif
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hostname = eval_hostname(host);
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if (HOSTNAME_KNOWN(hostname)) {
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return (host->name);
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} else {
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return (eval_hostaddr(host));
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}
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}
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/* eval_client - return string with as much about the client as we know */
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char *
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eval_client(struct request_info *request)
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{
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static char both[2 * STRING_LENGTH];
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char *hostinfo = eval_hostinfo(request->client);
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#ifndef ALWAYS_RFC931 /* no implicit user lookups */
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if (request->user[0] == 0)
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return (hostinfo);
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#endif
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if (STR_NE(eval_user(request), unknown)) {
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(void)snprintf(both, sizeof both, "%s@%s", request->user, hostinfo);
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return (both);
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} else {
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return (hostinfo);
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}
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}
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/* eval_server - return string with as much about the server as we know */
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char *
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eval_server(struct request_info *request)
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{
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static char both[2 * STRING_LENGTH];
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char *host = eval_hostinfo(request->server);
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char *daemon = eval_daemon(request);
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if (STR_NE(host, unknown)) {
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(void)snprintf(both, sizeof both, "%s@%s", daemon, host);
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return (both);
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} else {
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return (daemon);
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}
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}
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