Commit | Line | Data |
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2fe58dfd SE |
1 | /* Core interface of secnet, to be used by all modules */ |
2 | ||
3 | #ifndef secnet_h | |
4 | #define secnet_h | |
5 | ||
59635212 | 6 | #include "config.h" |
2fe58dfd | 7 | #include <stdlib.h> |
2fe58dfd | 8 | #include <stdarg.h> |
2fe58dfd | 9 | #include <sys/poll.h> |
8689b3a9 SE |
10 | #include <sys/types.h> |
11 | #include <sys/time.h> | |
2fe58dfd | 12 | #include <netinet/in.h> |
2fe58dfd | 13 | |
2fe58dfd SE |
14 | typedef char *string_t; |
15 | typedef enum {False,True} bool_t; | |
16 | ||
794f2398 SE |
17 | #define ASSERT(x) do { if (!(x)) { fatal("assertion failed line %d file " \ |
18 | __FILE__ "\n",__LINE__); } } while(0) | |
2fe58dfd SE |
19 | |
20 | /***** CONFIGURATION support *****/ | |
21 | ||
baa06aeb SE |
22 | extern bool_t just_check_config; /* If True then we're going to exit after |
23 | reading the configuration file */ | |
b2a56f7c | 24 | extern bool_t background; /* If True then we'll eventually run as a daemon */ |
baa06aeb | 25 | |
2fe58dfd SE |
26 | typedef struct dict dict_t; /* Configuration dictionary */ |
27 | typedef struct closure closure_t; | |
28 | typedef struct item item_t; | |
29 | typedef struct list list_t; /* A list of items */ | |
30 | ||
31 | /* Configuration file location, for error-reporting */ | |
32 | struct cloc { | |
33 | string_t file; | |
34 | uint32_t line; | |
35 | }; | |
36 | ||
37 | /* Modules export closures, which can be invoked from the configuration file. | |
38 | "Invoking" a closure usually returns another closure (of a different | |
39 | type), but can actually return any configuration object. */ | |
40 | typedef list_t *(apply_fn)(closure_t *self, struct cloc loc, | |
41 | dict_t *context, list_t *data); | |
42 | struct closure { | |
43 | string_t description; /* For debugging */ | |
44 | uint32_t type; /* Central registry... */ | |
45 | apply_fn *apply; | |
46 | void *interface; /* Interface for use inside secnet; depends on type */ | |
47 | }; | |
48 | ||
49 | enum types { t_null, t_bool, t_string, t_number, t_dict, t_closure }; | |
50 | struct item { | |
51 | enum types type; | |
52 | union { | |
53 | bool_t bool; | |
54 | string_t string; | |
55 | uint32_t number; | |
56 | dict_t *dict; | |
57 | closure_t *closure; | |
58 | } data; | |
59 | struct cloc loc; | |
60 | }; | |
61 | ||
62 | struct list { | |
63 | item_t *item; | |
64 | struct list *next; | |
65 | }; | |
66 | ||
67 | /* In the following two lookup functions, NULL means 'not found' */ | |
68 | /* Lookup a value in the specified dictionary, or its parents */ | |
69 | extern list_t *dict_lookup(dict_t *dict, string_t key); | |
70 | /* Lookup a value in just the specified dictionary */ | |
71 | extern list_t *dict_lookup_primitive(dict_t *dict, string_t key); | |
72 | /* Add a value to the specified dictionary */ | |
73 | extern void dict_add(dict_t *dict, string_t key, list_t *val); | |
74 | /* Obtain an array of keys in the dictionary. malloced; caller frees */ | |
75 | extern string_t *dict_keys(dict_t *dict); | |
76 | ||
77 | /* List-manipulation functions */ | |
78 | extern list_t *list_new(void); | |
b2a56f7c | 79 | extern uint32_t list_length(list_t *a); |
2fe58dfd SE |
80 | extern list_t *list_append(list_t *a, item_t *i); |
81 | extern list_t *list_append_list(list_t *a, list_t *b); | |
82 | /* Returns an item from the list (index starts at 0), or NULL */ | |
83 | extern item_t *list_elem(list_t *l, uint32_t index); | |
84 | ||
85 | /* Convenience functions */ | |
86 | extern list_t *new_closure(closure_t *cl); | |
87 | extern void add_closure(dict_t *dict, string_t name, apply_fn apply); | |
88 | extern void *find_cl_if(dict_t *dict, string_t name, uint32_t type, | |
89 | bool_t fail_if_invalid, string_t desc, | |
90 | struct cloc loc); | |
91 | extern item_t *dict_find_item(dict_t *dict, string_t key, bool_t required, | |
92 | string_t desc, struct cloc loc); | |
93 | extern string_t dict_read_string(dict_t *dict, string_t key, bool_t required, | |
94 | string_t desc, struct cloc loc); | |
95 | extern uint32_t dict_read_number(dict_t *dict, string_t key, bool_t required, | |
96 | string_t desc, struct cloc loc, uint32_t def); | |
97 | extern bool_t dict_read_bool(dict_t *dict, string_t key, bool_t required, | |
98 | string_t desc, struct cloc loc, bool_t def); | |
9d3a4132 SE |
99 | struct flagstr { |
100 | string_t name; | |
101 | uint32_t value; | |
102 | }; | |
b2a56f7c SE |
103 | extern uint32_t string_to_word(string_t s, struct cloc loc, |
104 | struct flagstr *f, string_t desc); | |
9d3a4132 SE |
105 | extern uint32_t string_list_to_word(list_t *l, struct flagstr *f, |
106 | string_t desc); | |
2fe58dfd SE |
107 | |
108 | /***** END of configuration support *****/ | |
109 | ||
7138d0c5 | 110 | /***** LOG functions *****/ |
2fe58dfd | 111 | |
b2a56f7c SE |
112 | #define M_DEBUG_CONFIG 0x001 |
113 | #define M_DEBUG_PHASE 0x002 | |
114 | #define M_DEBUG 0x004 | |
115 | #define M_INFO 0x008 | |
116 | #define M_NOTICE 0x010 | |
117 | #define M_WARNING 0x020 | |
469fd1d9 | 118 | #define M_ERR 0x040 |
b2a56f7c SE |
119 | #define M_SECURITY 0x080 |
120 | #define M_FATAL 0x100 | |
2fe58dfd SE |
121 | |
122 | extern void fatal(char *message, ...); | |
123 | extern void fatal_perror(char *message, ...); | |
124 | extern void fatal_status(int status, char *message, ...); | |
125 | extern void fatal_perror_status(int status, char *message, ...); | |
126 | extern void cfgfatal(struct cloc loc, string_t facility, char *message, ...); | |
127 | ||
2fe58dfd SE |
128 | extern void Message(uint32_t class, char *message, ...); |
129 | ||
7138d0c5 SE |
130 | /***** END of log functions *****/ |
131 | ||
132 | /***** UTILITY functions *****/ | |
133 | ||
134 | extern char *safe_strdup(char *string, char *message); | |
135 | extern void *safe_malloc(size_t size, char *message); | |
2fe58dfd | 136 | |
4efd681a SE |
137 | extern int sys_cmd(const char *file, char *argc, ...); |
138 | ||
2fe58dfd SE |
139 | /***** END of utility functions *****/ |
140 | ||
141 | /***** SCHEDULING support */ | |
142 | ||
143 | /* "now" is current program time, in milliseconds. It is derived | |
144 | (once) from tv_now. If nfds_io is insufficient for your needs, set | |
145 | it to the required number and return ERANGE. timeout is in milliseconds; | |
146 | if it is too high then lower it. It starts at -1 (==infinite) */ | |
147 | typedef int beforepoll_fn(void *st, struct pollfd *fds, int *nfds_io, | |
148 | int *timeout_io, const struct timeval *tv_now, | |
149 | uint64_t *now); | |
150 | typedef void afterpoll_fn(void *st, struct pollfd *fds, int nfds, | |
151 | const struct timeval *tv_now, uint64_t *now); | |
152 | ||
153 | /* Register interest in the main loop of the program. Before a call | |
154 | to poll() your supplied beforepoll function will be called. After | |
155 | the call to poll() the supplied afterpoll function will be called. | |
156 | max_nfds is a _hint_ about the maximum number of struct pollfd | |
157 | structures you may require - you can always ask for more in | |
158 | *nfds_io. */ | |
159 | extern void register_for_poll(void *st, beforepoll_fn *before, | |
160 | afterpoll_fn *after, uint32_t max_nfds, | |
161 | string_t desc); | |
162 | ||
163 | /***** END of scheduling support */ | |
164 | ||
165 | /***** PROGRAM LIFETIME support */ | |
166 | ||
167 | /* The secnet program goes through a number of phases in its lifetime. | |
168 | Module code may arrange to be called just as various phases are | |
169 | entered. */ | |
170 | ||
171 | #define PHASE_INIT 0 | |
172 | #define PHASE_GETOPTS 1 /* Process command-line arguments */ | |
173 | #define PHASE_READCONFIG 2 /* Parse and process configuration file */ | |
174 | #define PHASE_SETUP 3 /* Process information in configuration */ | |
baa06aeb SE |
175 | #define PHASE_GETRESOURCES 4 /* Obtain all external resources */ |
176 | #define PHASE_DROPPRIV 5 /* Last chance for privileged operations */ | |
177 | #define PHASE_RUN 6 | |
178 | #define PHASE_SHUTDOWN 7 /* About to die; delete key material, etc. */ | |
179 | #define NR_PHASES 8 | |
2fe58dfd SE |
180 | |
181 | typedef void hook_fn(void *self, uint32_t newphase); | |
182 | bool_t add_hook(uint32_t phase, hook_fn *f, void *state); | |
183 | bool_t remove_hook(uint32_t phase, hook_fn *f, void *state); | |
184 | ||
7138d0c5 SE |
185 | extern uint32_t current_phase; |
186 | extern void enter_phase(uint32_t new_phase); | |
187 | ||
9d3a4132 SE |
188 | extern bool_t require_root_privileges; /* Some features (like netlink |
189 | 'soft' routes) require that | |
190 | secnet retain root | |
191 | privileges. They should | |
192 | indicate that here when | |
193 | appropriate. */ | |
194 | extern string_t require_root_privileges_explanation; | |
195 | ||
2fe58dfd SE |
196 | /***** END of program lifetime support *****/ |
197 | ||
198 | /***** MODULE support *****/ | |
199 | ||
200 | /* Module initialisation function type - modules export one function of | |
201 | this type which is called to initialise them. For dynamically loaded | |
202 | modules it's called "secnet_module". */ | |
469fd1d9 | 203 | typedef void init_module(dict_t *dict); |
2fe58dfd SE |
204 | |
205 | /***** END of module support *****/ | |
206 | ||
207 | /***** CLOSURE TYPES and interface definitions *****/ | |
208 | ||
469fd1d9 SE |
209 | #define CL_PURE 0 |
210 | #define CL_RESOLVER 1 | |
211 | #define CL_RANDOMSRC 2 | |
212 | #define CL_RSAPUBKEY 3 | |
213 | #define CL_RSAPRIVKEY 4 | |
214 | #define CL_COMM 5 | |
215 | #define CL_IPIF 6 | |
216 | #define CL_LOG 7 | |
217 | #define CL_SITE 8 | |
218 | #define CL_TRANSFORM 9 | |
219 | #define CL_DH 11 | |
220 | #define CL_HASH 12 | |
221 | #define CL_BUFFER 13 | |
222 | #define CL_NETLINK 14 | |
2fe58dfd SE |
223 | |
224 | struct buffer_if; | |
225 | ||
226 | /* PURE closure requires no interface */ | |
227 | ||
228 | /* RESOLVER interface */ | |
229 | ||
230 | /* Answers to queries are delivered to a function of this | |
231 | type. 'address' will be NULL if there was a problem with the query. It | |
232 | will be freed once resolve_answer_fn returns. It is in network byte | |
233 | order. */ | |
234 | typedef void resolve_answer_fn(void *st, struct in_addr *addr); | |
235 | typedef bool_t resolve_request_fn(void *st, string_t name, | |
236 | resolve_answer_fn *cb, void *cst); | |
237 | struct resolver_if { | |
238 | void *st; | |
239 | resolve_request_fn *request; | |
240 | }; | |
241 | ||
242 | /* RANDOMSRC interface */ | |
243 | ||
244 | /* Return some random data. Returns TRUE for success. */ | |
245 | typedef bool_t random_fn(void *st, uint32_t bytes, uint8_t *buff); | |
246 | ||
247 | struct random_if { | |
248 | void *st; | |
249 | bool_t blocking; | |
250 | random_fn *generate; | |
251 | }; | |
252 | ||
253 | /* RSAPUBKEY interface */ | |
254 | ||
255 | typedef bool_t rsa_checksig_fn(void *st, uint8_t *data, uint32_t datalen, | |
256 | string_t signature); | |
257 | struct rsapubkey_if { | |
258 | void *st; | |
259 | rsa_checksig_fn *check; | |
260 | }; | |
261 | ||
262 | /* RSAPRIVKEY interface */ | |
263 | ||
264 | typedef string_t rsa_makesig_fn(void *st, uint8_t *data, uint32_t datalen); | |
265 | struct rsaprivkey_if { | |
266 | void *st; | |
267 | rsa_makesig_fn *sign; | |
268 | }; | |
269 | ||
270 | /* COMM interface */ | |
271 | ||
272 | /* Return True if the packet was processed, and shouldn't be passed to | |
273 | any other potential receivers. */ | |
274 | typedef bool_t comm_notify_fn(void *state, struct buffer_if *buf, | |
275 | struct sockaddr_in *source); | |
276 | typedef void comm_request_notify_fn(void *commst, void *nst, | |
277 | comm_notify_fn *fn); | |
278 | typedef void comm_release_notify_fn(void *commst, void *nst, | |
279 | comm_notify_fn *fn); | |
280 | typedef bool_t comm_sendmsg_fn(void *commst, struct buffer_if *buf, | |
281 | struct sockaddr_in *dest); | |
282 | struct comm_if { | |
283 | void *st; | |
284 | comm_request_notify_fn *request_notify; | |
285 | comm_release_notify_fn *release_notify; | |
286 | comm_sendmsg_fn *sendmsg; | |
287 | }; | |
288 | ||
289 | /* LOG interface */ | |
290 | ||
b2a56f7c SE |
291 | typedef void log_msg_fn(void *st, int class, char *message, ...); |
292 | typedef void log_vmsg_fn(void *st, int class, char *message, va_list args); | |
2fe58dfd SE |
293 | struct log_if { |
294 | void *st; | |
295 | log_msg_fn *log; | |
296 | log_vmsg_fn *vlog; | |
297 | }; | |
298 | /* (convenience function, defined in util.c) */ | |
b2a56f7c | 299 | extern void log(struct log_if *lf, int class, char *message, ...); |
2fe58dfd SE |
300 | |
301 | /* SITE interface */ | |
302 | ||
303 | /* Pretty much a placeholder; allows starting and stopping of processing, | |
304 | key expiry, etc. */ | |
305 | typedef void site_control_fn(void *st, bool_t run); | |
306 | typedef uint32_t site_status_fn(void *st); | |
307 | struct site_if { | |
308 | void *st; | |
309 | site_control_fn *control; | |
310 | site_status_fn *status; | |
311 | }; | |
312 | ||
313 | /* TRANSFORM interface */ | |
314 | ||
315 | /* A reversable transformation. Transforms buffer in-place; may add | |
316 | data to start or end. Maximum amount of data to be added specified | |
317 | in max_start_pad and max_end_pad. (Reverse transformations decrease | |
318 | length, of course.) Transformations may be key-dependent, in which | |
319 | case key material is passed in at initialisation time. They may | |
320 | also depend on internal factors (eg. time) and keep internal | |
321 | state. A struct transform_if only represents a particular type of | |
322 | transformation; instances of the transformation (eg. with | |
323 | particular key material) have a different C type. */ | |
324 | ||
325 | typedef struct transform_inst_if *transform_createinstance_fn(void *st); | |
326 | typedef bool_t transform_setkey_fn(void *st, uint8_t *key, uint32_t keylen); | |
327 | typedef void transform_delkey_fn(void *st); | |
328 | typedef void transform_destroyinstance_fn(void *st); | |
329 | /* Returns 0 for 'all is well', any other value for a problem */ | |
330 | typedef uint32_t transform_apply_fn(void *st, struct buffer_if *buf, | |
331 | char **errmsg); | |
332 | ||
333 | struct transform_inst_if { | |
334 | void *st; | |
335 | transform_setkey_fn *setkey; | |
336 | transform_delkey_fn *delkey; | |
337 | transform_apply_fn *forwards; | |
338 | transform_apply_fn *reverse; | |
339 | transform_destroyinstance_fn *destroy; | |
340 | }; | |
341 | ||
342 | struct transform_if { | |
343 | void *st; | |
344 | uint32_t max_start_pad; | |
345 | uint32_t max_end_pad; | |
346 | uint32_t keylen; | |
347 | transform_createinstance_fn *create; | |
348 | }; | |
349 | ||
350 | /* NETLINK interface */ | |
351 | ||
70dc107b SE |
352 | /* Used by netlink to deliver to site, and by site to deliver to |
353 | netlink. cid is the client identifier returned by | |
354 | netlink_regnets_fn. If buf has size 0 then the function is just | |
355 | being called for its site-effects (eg. making the site code attempt | |
356 | to bring up a network link) */ | |
469fd1d9 | 357 | typedef void netlink_deliver_fn(void *st, struct buffer_if *buf); |
4efd681a | 358 | /* site code can tell netlink when outgoing packets will be dropped, |
70dc107b SE |
359 | so netlink can generate appropriate ICMP and make routing decisions */ |
360 | #define LINK_QUALITY_DOWN 0 /* No chance of a packet being delivered */ | |
361 | #define LINK_QUALITY_DOWN_STALE_ADDRESS 1 /* Link down, old address information */ | |
362 | #define LINK_QUALITY_DOWN_CURRENT_ADDRESS 2 /* Link down, current address information */ | |
363 | #define LINK_QUALITY_UP 3 /* Link active */ | |
364 | #define MAXIMUM_LINK_QUALITY 3 | |
469fd1d9 SE |
365 | typedef void netlink_link_quality_fn(void *st, uint32_t quality); |
366 | typedef void netlink_register_fn(void *st, netlink_deliver_fn *deliver, | |
367 | void *dst, uint32_t max_start_pad, | |
368 | uint32_t max_end_pad); | |
794f2398 SE |
369 | typedef void netlink_output_config_fn(void *st, struct buffer_if *buf); |
370 | typedef bool_t netlink_check_config_fn(void *st, struct buffer_if *buf); | |
d3fe100d | 371 | typedef void netlink_set_mtu_fn(void *st, uint32_t new_mtu); |
2fe58dfd SE |
372 | struct netlink_if { |
373 | void *st; | |
469fd1d9 | 374 | netlink_register_fn *reg; |
2fe58dfd | 375 | netlink_deliver_fn *deliver; |
70dc107b | 376 | netlink_link_quality_fn *set_quality; |
794f2398 SE |
377 | netlink_output_config_fn *output_config; |
378 | netlink_check_config_fn *check_config; | |
d3fe100d | 379 | netlink_set_mtu_fn *set_mtu; |
2fe58dfd SE |
380 | }; |
381 | ||
382 | /* DH interface */ | |
383 | ||
384 | /* Returns public key as a malloced hex string */ | |
385 | typedef string_t dh_makepublic_fn(void *st, uint8_t *secret, | |
386 | uint32_t secretlen); | |
387 | /* Fills buffer (up to buflen) with shared secret */ | |
388 | typedef void dh_makeshared_fn(void *st, uint8_t *secret, | |
389 | uint32_t secretlen, string_t rempublic, | |
390 | uint8_t *sharedsecret, uint32_t buflen); | |
391 | struct dh_if { | |
392 | void *st; | |
393 | uint32_t len; /* Approximate size of modulus in bytes */ | |
394 | dh_makepublic_fn *makepublic; | |
395 | dh_makeshared_fn *makeshared; | |
396 | }; | |
397 | ||
398 | /* HASH interface */ | |
399 | ||
400 | typedef void *hash_init_fn(void); | |
401 | typedef void hash_update_fn(void *st, uint8_t const *buf, uint32_t len); | |
402 | typedef void hash_final_fn(void *st, uint8_t *digest); | |
403 | struct hash_if { | |
404 | uint32_t len; /* Hash output length in bytes */ | |
405 | hash_init_fn *init; | |
406 | hash_update_fn *update; | |
407 | hash_final_fn *final; | |
408 | }; | |
409 | ||
410 | /* BUFFER interface */ | |
411 | ||
412 | struct buffer_if { | |
413 | bool_t free; | |
414 | string_t owner; /* Set to constant string */ | |
415 | uint32_t flags; /* How paranoid should we be? */ | |
416 | struct cloc loc; /* Where we were defined */ | |
417 | uint8_t *base; | |
418 | uint8_t *start; | |
419 | uint32_t size; /* Size of buffer contents */ | |
420 | uint32_t len; /* Total length allocated at base */ | |
421 | }; | |
422 | ||
423 | #endif /* secnet_h */ |