contrib/tcp_wrappers/socket.c

4   * it provides methods to map a transport address to a printable host name
7   * The result from the hostname lookup method is STRING_PARANOID when a host
8   * pretends to have someone elses name, or when a host name is available but
50   * Speed up DNS lookups by terminating the host name with a dot. Should be
95      * Look up the client host address. Hal R. Brand <BRAND@addvax.llnl.gov>
96      * suggested how to get the client host info in case of UDP connections:
142 void    sock_hostaddr(host)
143 struct host_info *host;
146     struct sockaddr *sin = host->sin;
157     getnameinfo(sin, salen, host->addr, sizeof(host->addr),
160     struct sockaddr_in *sin = host->sin;
163 	STRN_CPY(host->addr, inet_ntoa(sin->sin_addr), sizeof(host->addr));
167 /* sock_hostname - map endpoint address to host name */
169 void    sock_hostname(host)
170 struct host_info *host;
173     struct sockaddr *sin = host->sin;
214 	STRN_CPY(host->name, hname, sizeof(host->name));
221 	if ((err = getaddrinfo(host->name, NULL, &hints, &res0)) == 0) {
223 	    tcpd_warn("host name/name mismatch: "
225 		      host->name);
226 	    strcpy(host->name, paranoid);	/* name is bad, clobber it */
250 	if (getaddrinfo(host->name, NULL, &hints, &res0) != 0) {
253 	     * Unable to verify that the host name matches the address. This
258 		      host->name,
262 		    || STR_NE(host->name, res0->ai_canonname))
263 		   && STR_NE(host->name, "localhost")) {
271 	    tcpd_warn("host name/name mismatch: %s != %.*s",
272 		      host->name, STRING_LENGTH,
309 	     * The host name does not map to the initial address. Perhaps
316 	    tcpd_warn("host name/address mismatch: %s != %.*s",
320 	strcpy(host->name, paranoid);		/* name is bad, clobber it */
325     struct sockaddr_in *sin = host->sin;
334      * host name/address checking code below.
340 	STRN_CPY(host->name, hp->h_name, sizeof(host->name));
355 	if ((hp = gethostbyname(host->name)) == 0) {
358 	     * Unable to verify that the host name matches the address. This
363 		      host->name);
365 	} else if (STR_NE(host->name, hp->h_name)
366 		   && STR_NE(host->name, "localhost")) {
374 	    tcpd_warn("host name/name mismatch: %s != %.*s",
375 		      host->name, STRING_LENGTH, hp->h_name);
394 	     * The host name does not map to the initial address. Perhaps
399 	    tcpd_warn("host name/address mismatch: %s != %.*s",
402 	strcpy(host->name, paranoid);		/* name is bad, clobber it */