1 /* authd/providers/rdns.c - rDNS lookup provider for authd
2 * Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice is present in all copies.
8 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
9 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
10 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
11 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
12 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
13 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
14 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
15 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
16 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
17 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
18 * POSSIBILITY OF SUCH DAMAGE.
22 #include "rb_commio.h"
30 struct dns_query
*query
; /* Pending DNS query */
31 time_t timeout
; /* When the request times out */
34 /* Goinked from old s_auth.c --Elizabeth */
35 static const char *messages
[] =
37 "*** Looking up your hostname...",
38 "*** Found your hostname",
39 "*** Couldn't look up your hostname",
40 "*** Your hostname is too long, ignoring hostname",
51 static void client_fail(struct auth_client
*auth
, dns_message message
);
52 static void client_success(struct auth_client
*auth
);
53 static void dns_answer_callback(const char *res
, bool status
, query_type type
, void *data
);
55 static struct ev_entry
*timeout_ev
;
56 static EVH timeout_dns_queries_event
;
57 static int rdns_timeout
= 15;
60 bool client_dns_init(void)
62 timeout_ev
= rb_event_addish("timeout_dns_queries_event", timeout_dns_queries_event
, NULL
, 1);
63 return (timeout_ev
!= NULL
);
66 void client_dns_destroy(void)
68 struct auth_client
*auth
;
69 rb_dictionary_iter iter
;
71 RB_DICTIONARY_FOREACH(auth
, &iter
, auth_clients
)
73 if(auth
->data
[PROVIDER_RDNS
] != NULL
)
74 client_fail(auth
, REPORT_FAIL
);
77 rb_event_delete(timeout_ev
);
80 bool client_dns_start(struct auth_client
*auth
)
82 struct user_query
*query
= rb_malloc(sizeof(struct user_query
));
84 query
->timeout
= rb_current_time() + rdns_timeout
;
86 auth
->data
[PROVIDER_RDNS
] = query
;
88 query
->query
= lookup_hostname(auth
->c_ip
, dns_answer_callback
, auth
);
90 notice_client(auth
, messages
[REPORT_LOOKUP
]);
91 set_provider_on(auth
, PROVIDER_RDNS
);
95 void client_dns_cancel(struct auth_client
*auth
)
97 struct user_query
*query
= auth
->data
[PROVIDER_RDNS
];
100 client_fail(auth
, REPORT_FAIL
);
104 dns_answer_callback(const char *res
, bool status
, query_type type
, void *data
)
106 struct auth_client
*auth
= data
;
107 struct user_query
*query
= auth
->data
[PROVIDER_RDNS
];
109 if(query
== NULL
|| res
== NULL
|| status
== false)
110 client_fail(auth
, REPORT_FAIL
);
111 else if(strlen(res
) > HOSTLEN
)
112 client_fail(auth
, REPORT_TOOLONG
);
115 rb_strlcpy(auth
->hostname
, res
, HOSTLEN
+ 1);
116 client_success(auth
);
120 /* Timeout outstanding queries */
121 static void timeout_dns_queries_event(void *notused
)
123 struct auth_client
*auth
;
124 rb_dictionary_iter iter
;
126 RB_DICTIONARY_FOREACH(auth
, &iter
, auth_clients
)
128 struct user_query
*query
= auth
->data
[PROVIDER_RDNS
];
130 if(query
!= NULL
&& query
->timeout
< rb_current_time())
132 client_fail(auth
, REPORT_FAIL
);
138 static void client_fail(struct auth_client
*auth
, dns_message report
)
140 struct user_query
*query
= auth
->data
[PROVIDER_RDNS
];
145 rb_strlcpy(auth
->hostname
, "*", sizeof(auth
->hostname
));
147 notice_client(auth
, messages
[report
]);
148 cancel_query(query
->query
);
151 auth
->data
[PROVIDER_RDNS
] = NULL
;
153 provider_done(auth
, PROVIDER_RDNS
);
156 static void client_success(struct auth_client
*auth
)
158 struct user_query
*query
= auth
->data
[PROVIDER_RDNS
];
160 notice_client(auth
, messages
[REPORT_FOUND
]);
161 cancel_query(query
->query
);
164 auth
->data
[PROVIDER_RDNS
] = NULL
;
166 provider_done(auth
, PROVIDER_RDNS
);
169 struct auth_provider rdns_provider
=
172 .init
= client_dns_init
,
173 .destroy
= client_dns_destroy
,
174 .start
= client_dns_start
,
175 .cancel
= client_dns_cancel
,