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1 | /* authd/authd.c - main code for authd | |
2 | * Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org> | |
3 | * | |
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. | |
7 | * | |
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. | |
19 | */ | |
20 | ||
21 | #include "authd.h" | |
22 | #include "dns.h" | |
23 | #include "provider.h" | |
24 | #include "notice.h" | |
25 | ||
26 | #define MAXPARA 10 | |
27 | ||
28 | static void handle_reload(int parc, char *parv[]); | |
29 | static void handle_stat(int parc, char *parv[]); | |
30 | static void handle_options(int parc, char *parv[]); | |
31 | ||
32 | rb_helper *authd_helper = NULL; | |
33 | authd_cmd_handler authd_cmd_handlers[256] = { | |
34 | ['C'] = handle_new_connection, | |
35 | ['D'] = resolve_dns, | |
36 | ['O'] = handle_options, | |
37 | ['R'] = handle_reload, | |
38 | ['S'] = handle_stat, | |
39 | }; | |
40 | ||
41 | authd_stat_handler authd_stat_handlers[256] = { | |
42 | ['D'] = enumerate_nameservers, | |
43 | }; | |
44 | ||
45 | authd_reload_handler authd_reload_handlers[256] = { | |
46 | ['D'] = reload_nameservers, | |
47 | }; | |
48 | ||
49 | rb_dictionary *authd_option_handlers; | |
50 | ||
51 | static void | |
52 | handle_stat(int parc, char *parv[]) | |
53 | { | |
54 | authd_stat_handler handler; | |
55 | ||
56 | if(parc < 3) | |
57 | { | |
58 | warn_opers(L_CRIT, "BUG: handle_stat received too few parameters (at least 3 expected, got %d)", parc); | |
59 | return; | |
60 | } | |
61 | ||
62 | if (!(handler = authd_stat_handlers[(unsigned char)parv[2][0]])) | |
63 | return; | |
64 | ||
65 | handler(parv[1], parv[2][0]); | |
66 | } | |
67 | ||
68 | static void | |
69 | handle_options(int parc, char *parv[]) | |
70 | { | |
71 | struct auth_opts_handler *handler; | |
72 | ||
73 | if(parc < 4) | |
74 | { | |
75 | warn_opers(L_CRIT, "BUG: handle_options received too few parameters (at least 4 expected, got %d)", parc); | |
76 | return; | |
77 | } | |
78 | ||
79 | if((handler = rb_dictionary_retrieve(authd_option_handlers, parv[1])) == NULL) | |
80 | { | |
81 | warn_opers(L_CRIT, "BUG: handle_options got a bad option type %s", parv[1]); | |
82 | return; | |
83 | } | |
84 | ||
85 | if((parc - 2) < handler->min_parc) | |
86 | { | |
87 | warn_opers(L_CRIT, "BUG: handle_options received too few parameters (at least %d expected, got %d)", handler->min_parc, parc); | |
88 | return; | |
89 | } | |
90 | ||
91 | handler->handler(parv[1], parc - 2, (const char **)(parv + 3)); | |
92 | } | |
93 | ||
94 | static void | |
95 | handle_reload(int parc, char *parv[]) | |
96 | { | |
97 | authd_reload_handler handler; | |
98 | ||
99 | if(parc < 2) | |
100 | { | |
101 | /* Reload all handlers */ | |
102 | for(size_t i = 0; i < 256; i++) | |
103 | { | |
104 | if ((handler = authd_reload_handlers[(unsigned char) i]) != NULL) | |
105 | handler(parv[1][0]); | |
106 | } | |
107 | ||
108 | return; | |
109 | } | |
110 | ||
111 | if (!(handler = authd_reload_handlers[(unsigned char)parv[1][0]])) | |
112 | return; | |
113 | ||
114 | handler(parv[1][0]); | |
115 | } | |
116 | ||
117 | static void | |
118 | parse_request(rb_helper *helper) | |
119 | { | |
120 | static char *parv[MAXPARA + 1]; | |
121 | static char readbuf[READBUF_SIZE]; | |
122 | int parc; | |
123 | int len; | |
124 | authd_cmd_handler handler; | |
125 | ||
126 | while((len = rb_helper_read(helper, readbuf, sizeof(readbuf))) > 0) | |
127 | { | |
128 | parc = rb_string_to_array(readbuf, parv, MAXPARA); | |
129 | ||
130 | if(parc < 1) | |
131 | continue; | |
132 | ||
133 | handler = authd_cmd_handlers[(unsigned char)parv[0][0]]; | |
134 | if (handler != NULL) | |
135 | handler(parc, parv); | |
136 | } | |
137 | } | |
138 | ||
139 | static void | |
140 | error_cb(rb_helper *helper) | |
141 | { | |
142 | exit(1); | |
143 | } | |
144 | ||
145 | #ifndef _WIN32 | |
146 | static void | |
147 | dummy_handler(int sig) | |
148 | { | |
149 | return; | |
150 | } | |
151 | #endif | |
152 | ||
153 | static void | |
154 | setup_signals(void) | |
155 | { | |
156 | #ifndef _WIN32 | |
157 | struct sigaction act; | |
158 | ||
159 | act.sa_flags = 0; | |
160 | act.sa_handler = SIG_IGN; | |
161 | sigemptyset(&act.sa_mask); | |
162 | sigaddset(&act.sa_mask, SIGPIPE); | |
163 | sigaddset(&act.sa_mask, SIGALRM); | |
164 | #ifdef SIGTRAP | |
165 | sigaddset(&act.sa_mask, SIGTRAP); | |
166 | #endif | |
167 | ||
168 | #ifdef SIGWINCH | |
169 | sigaddset(&act.sa_mask, SIGWINCH); | |
170 | sigaction(SIGWINCH, &act, 0); | |
171 | #endif | |
172 | sigaction(SIGPIPE, &act, 0); | |
173 | #ifdef SIGTRAP | |
174 | sigaction(SIGTRAP, &act, 0); | |
175 | #endif | |
176 | ||
177 | act.sa_handler = dummy_handler; | |
178 | sigaction(SIGALRM, &act, 0); | |
179 | #endif | |
180 | } | |
181 | ||
182 | int | |
183 | main(int argc, char *argv[]) | |
184 | { | |
185 | setup_signals(); | |
186 | ||
187 | authd_helper = rb_helper_child(parse_request, error_cb, NULL, NULL, NULL, 256, 256, 256); /* XXX fix me */ | |
188 | if(authd_helper == NULL) | |
189 | { | |
190 | fprintf(stderr, "authd is not meant to be invoked by end users\n"); | |
191 | exit(1); | |
192 | } | |
193 | ||
194 | rb_set_time(); | |
195 | setup_signals(); | |
196 | ||
197 | authd_option_handlers = rb_dictionary_create("authd options handlers", strcasecmp); | |
198 | ||
199 | init_resolver(); | |
200 | init_providers(); | |
201 | rb_init_prng(NULL, RB_PRNG_DEFAULT); | |
202 | ||
203 | rb_helper_loop(authd_helper, 0); | |
204 | ||
205 | return 0; | |
206 | } |