Commit | Line | Data |
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2fe58dfd SE |
1 | /* $Log: util.c,v $ |
2 | * Revision 1.2 1996/04/14 16:34:36 sde1000 | |
3 | * Added syslog support | |
4 | * mpbin/mpstring functions moved from dh.c | |
5 | * | |
6 | * Revision 1.1 1996/03/14 17:05:03 sde1000 | |
7 | * Initial revision | |
8 | * | |
9 | */ | |
10 | ||
11 | #include "config.h" | |
12 | #include <stdio.h> | |
13 | #include <stdarg.h> | |
14 | #include <string.h> | |
15 | #include <errno.h> | |
16 | #include <syslog.h> | |
17 | #include <unistd.h> | |
18 | #include <values.h> | |
19 | #include <assert.h> | |
20 | #include "util.h" | |
21 | #include "secnet.h" | |
22 | ||
23 | #define MIN_BUFFER_SIZE 64 | |
24 | #define DEFAULT_BUFFER_SIZE 4096 | |
25 | #define MAX_BUFFER_SIZE 131072 | |
26 | ||
27 | static char *hexdigits="0123456789abcdef"; | |
28 | ||
29 | uint32_t message_level=M_WARNING|M_ERROR|M_FATAL; | |
30 | uint32_t syslog_level=M_WARNING|M_ERROR|M_FATAL; | |
31 | static uint32_t current_phase=0; | |
32 | ||
33 | struct phase_hook { | |
34 | hook_fn *fn; | |
35 | void *state; | |
36 | struct phase_hook *next; | |
37 | }; | |
38 | ||
39 | static struct phase_hook *hooks[NR_PHASES]={NULL,}; | |
40 | ||
41 | static void vMessage(uint32_t class, char *message, va_list args) | |
42 | { | |
43 | FILE *dest=stdout; | |
44 | if (class & message_level) { | |
45 | if (class&M_FATAL || class&M_ERROR || class&M_WARNING) { | |
46 | dest=stderr; | |
47 | } | |
48 | vfprintf(dest,message,args); | |
49 | } | |
50 | /* XXX do something about syslog output here */ | |
51 | #if 0 | |
52 | /* Maybe send message to syslog */ | |
53 | vsprintf(buff, message, args); | |
54 | /* XXX Send each line as a separate log entry */ | |
55 | log(syslog_prio[level], buff); | |
56 | #endif /* 0 */ | |
57 | } | |
58 | ||
59 | void Message(uint32_t class, char *message, ...) | |
60 | { | |
61 | va_list ap; | |
62 | ||
63 | va_start(ap,message); | |
64 | ||
65 | vMessage(class,message,ap); | |
66 | ||
67 | va_end(ap); | |
68 | } | |
69 | ||
70 | static void vfatal(int status, bool_t perror, char *message, va_list args) | |
71 | { | |
72 | int err; | |
73 | ||
74 | err=errno; | |
75 | ||
76 | enter_phase(PHASE_SHUTDOWN); | |
77 | if (perror) { | |
78 | Message(M_FATAL, "secnet fatal error: "); | |
79 | vMessage(M_FATAL, message, args); | |
80 | Message(M_FATAL, ": %s\n",strerror(err)); | |
81 | } | |
82 | else { | |
83 | Message(M_FATAL, "secnet fatal error: "); | |
84 | vMessage(M_FATAL,message,args); | |
85 | } | |
86 | exit(status); | |
87 | } | |
88 | ||
89 | void fatal(char *message, ...) | |
90 | { | |
91 | va_list args; | |
92 | va_start(args,message); | |
93 | vfatal(current_phase,False,message,args); | |
94 | va_end(args); | |
95 | } | |
96 | ||
97 | void fatal_status(int status, char *message, ...) | |
98 | { | |
99 | va_list args; | |
100 | va_start(args,message); | |
101 | vfatal(status,False,message,args); | |
102 | va_end(args); | |
103 | } | |
104 | ||
105 | void fatal_perror(char *message, ...) | |
106 | { | |
107 | va_list args; | |
108 | va_start(args,message); | |
109 | vfatal(current_phase,True,message,args); | |
110 | va_end(args); | |
111 | } | |
112 | ||
113 | void fatal_perror_status(int status, char *message, ...) | |
114 | { | |
115 | va_list args; | |
116 | va_start(args,message); | |
117 | vfatal(status,True,message,args); | |
118 | va_end(args); | |
119 | } | |
120 | ||
121 | void cfgfatal(struct cloc loc, string_t facility, char *message, ...) | |
122 | { | |
123 | va_list args; | |
124 | ||
125 | va_start(args,message); | |
126 | ||
127 | enter_phase(PHASE_SHUTDOWN); | |
128 | ||
129 | if (loc.file && loc.line) { | |
130 | Message(M_FATAL, "config error (%s, %s:%d): ",facility,loc.file, | |
131 | loc.line); | |
132 | } else if (!loc.file && loc.line) { | |
133 | Message(M_FATAL, "config error (%s, line %d): ",facility,loc.line); | |
134 | } else { | |
135 | Message(M_FATAL, "config error (%s): ",facility); | |
136 | } | |
137 | ||
138 | vMessage(M_FATAL,message,args); | |
139 | va_end(args); | |
140 | exit(current_phase); | |
141 | } | |
142 | ||
143 | char *safe_strdup(char *s, char *message) | |
144 | { | |
145 | char *d; | |
146 | d=strdup(s); | |
147 | if (!d) { | |
148 | fatal_perror(message); | |
149 | } | |
150 | return d; | |
151 | } | |
152 | ||
153 | void *safe_malloc(size_t size, char *message) | |
154 | { | |
155 | void *r; | |
156 | r=malloc(size); | |
157 | if (!r) { | |
158 | fatal_perror(message); | |
159 | } | |
160 | return r; | |
161 | } | |
162 | ||
163 | /* Convert a buffer into its MP_INT representation */ | |
164 | void read_mpbin(MP_INT *a, uint8_t *bin, int binsize) | |
165 | { | |
166 | char *buff; | |
167 | int i; | |
168 | ||
169 | buff=safe_malloc(binsize*2 + 1,"read_mpbin"); | |
170 | ||
171 | for (i=0; i<binsize; i++) { | |
172 | buff[i*2]=hexdigits[(bin[i] & 0xf0) >> 4]; | |
173 | buff[i*2+1]=hexdigits[(bin[i] & 0xf)]; | |
174 | } | |
175 | buff[binsize*2]=0; | |
176 | ||
177 | mpz_set_str(a, buff, 16); | |
178 | free(buff); | |
179 | } | |
180 | ||
181 | /* Convert a MP_INT into a hex string */ | |
182 | char *write_mpstring(MP_INT *a) | |
183 | { | |
184 | char *buff; | |
185 | ||
186 | buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring"); | |
187 | mpz_get_str(buff, 16, a); | |
188 | return buff; | |
189 | } | |
190 | ||
191 | static uint8_t hexval(uint8_t c) | |
192 | { | |
193 | switch (c) { | |
194 | case '0': return 0; | |
195 | case '1': return 1; | |
196 | case '2': return 2; | |
197 | case '3': return 3; | |
198 | case '4': return 4; | |
199 | case '5': return 5; | |
200 | case '6': return 6; | |
201 | case '7': return 7; | |
202 | case '8': return 8; | |
203 | case '9': return 9; | |
204 | case 'a': return 10; | |
205 | case 'A': return 10; | |
206 | case 'b': return 11; | |
207 | case 'B': return 11; | |
208 | case 'c': return 12; | |
209 | case 'C': return 12; | |
210 | case 'd': return 13; | |
211 | case 'D': return 13; | |
212 | case 'e': return 14; | |
213 | case 'E': return 14; | |
214 | case 'f': return 15; | |
215 | case 'F': return 15; | |
216 | } | |
217 | return -1; | |
218 | } | |
219 | ||
220 | /* Convert a MP_INT into a buffer; return length; truncate if necessary */ | |
221 | uint32_t write_mpbin(MP_INT *a, uint8_t *buffer, uint32_t buflen) | |
222 | { | |
223 | char *hb; | |
224 | int i,j,l; | |
225 | ||
226 | if (buflen==0) return 0; | |
227 | hb=write_mpstring(a); | |
228 | ||
229 | l=strlen(hb); | |
230 | i=0; j=0; | |
231 | if (l&1) { | |
232 | /* The number starts with a half-byte */ | |
233 | buffer[i++]=hexval(hb[j++]); | |
234 | } | |
235 | for (; hb[j] && i<buflen; i++) { | |
236 | buffer[i]=(hexval(hb[j])<<4)|hexval(hb[j+1]); | |
237 | j+=2; | |
238 | } | |
239 | free(hb); | |
240 | return i; | |
241 | } | |
242 | ||
243 | bool_t subnet_match(struct subnet_list *list, uint32_t address) | |
244 | { | |
245 | uint32_t i; | |
246 | for (i=0; i<list->entries; i++) { | |
247 | if (list->list[i].prefix == (address&list->list[i].mask)) return True; | |
248 | } | |
249 | return False; | |
250 | } | |
251 | ||
252 | /* The string buffer must be at least 16 bytes long */ | |
253 | string_t ipaddr_to_string(uint32_t addr) | |
254 | { | |
255 | uint8_t a,b,c,d; | |
256 | string_t s; | |
257 | ||
258 | s=safe_malloc(16,"ipaddr_to_string"); | |
259 | a=addr>>24; | |
260 | b=addr>>16; | |
261 | c=addr>>8; | |
262 | d=addr; | |
263 | snprintf(s, 16, "%d.%d.%d.%d", a, b, c, d); | |
264 | return s; | |
265 | } | |
266 | ||
267 | string_t subnet_to_string(struct subnet *sn) | |
268 | { | |
269 | uint32_t mask=sn->mask, addr=sn->prefix; | |
270 | uint8_t a,b,c,d; | |
271 | string_t s; | |
272 | int i; | |
273 | ||
274 | s=safe_malloc(19,"subnet_to_string"); | |
275 | a=addr>>24; | |
276 | b=addr>>16; | |
277 | c=addr>>8; | |
278 | d=addr; | |
279 | for (i=0; mask; i++) { | |
280 | mask=(mask<<1); | |
281 | } | |
282 | snprintf(s, 19, "%d.%d.%d.%d/%d", a, b, c, d, i); | |
283 | return s; | |
284 | } | |
285 | ||
286 | /* Take a list of log closures and merge them */ | |
287 | struct loglist { | |
288 | struct log_if *l; | |
289 | struct loglist *next; | |
290 | }; | |
291 | ||
292 | static void log_vmulti(void *state, int priority, char *message, va_list args) | |
293 | { | |
294 | struct loglist *st=state, *i; | |
295 | ||
296 | for (i=st; i; i=i->next) { | |
297 | i->l->vlog(i->l->st,priority,message,args); | |
298 | } | |
299 | } | |
300 | ||
301 | static void log_multi(void *st, int priority, char *message, ...) | |
302 | { | |
303 | va_list ap; | |
304 | ||
305 | va_start(ap,message); | |
306 | ||
307 | log_vmulti(st,priority,message,ap); | |
308 | ||
309 | va_end(ap); | |
310 | } | |
311 | ||
312 | struct log_if *init_log(list_t *ll) | |
313 | { | |
314 | int i=0; | |
315 | item_t *item; | |
316 | closure_t *cl; | |
317 | struct loglist *l=NULL, *n; | |
318 | struct log_if *r; | |
319 | ||
320 | while ((item=list_elem(ll,i++))) { | |
321 | if (item->type!=t_closure) { | |
322 | cfgfatal(item->loc,"init_log","item is not a closure"); | |
323 | } | |
324 | cl=item->data.closure; | |
325 | if (cl->type!=CL_LOG) { | |
326 | cfgfatal(item->loc,"init_log","closure is not a logger"); | |
327 | } | |
328 | n=safe_malloc(sizeof(*n),"init_log"); | |
329 | n->l=cl->interface; | |
330 | n->next=l; | |
331 | l=n; | |
332 | } | |
333 | if (!l) { | |
334 | fatal("init_log: none of the items in the list are loggers"); | |
335 | } | |
336 | r=safe_malloc(sizeof(*r), "init_log"); | |
337 | r->st=l; | |
338 | r->log=log_multi; | |
339 | r->vlog=log_vmulti; | |
340 | return r; | |
341 | } | |
342 | ||
343 | struct logfile { | |
344 | closure_t cl; | |
345 | struct log_if ops; | |
346 | FILE *f; | |
347 | }; | |
348 | ||
349 | static void logfile_vlog(void *state, int priority, char *message, | |
350 | va_list args) | |
351 | { | |
352 | struct logfile *st=state; | |
353 | ||
354 | vfprintf(st->f,message,args); | |
355 | fprintf(st->f,"\n"); | |
356 | } | |
357 | ||
358 | static void logfile_log(void *state, int priority, char *message, ...) | |
359 | { | |
360 | va_list ap; | |
361 | ||
362 | va_start(ap,message); | |
363 | logfile_vlog(state,priority,message,ap); | |
364 | va_end(ap); | |
365 | } | |
366 | ||
367 | static list_t *logfile_apply(closure_t *self, struct cloc loc, dict_t *context, | |
368 | list_t *data) | |
369 | { | |
370 | struct logfile *st; | |
371 | ||
372 | st=safe_malloc(sizeof(*st),"logfile_apply"); | |
373 | st->cl.description="logfile"; | |
374 | st->cl.type=CL_LOG; | |
375 | st->cl.apply=NULL; | |
376 | st->cl.interface=&st->ops; | |
377 | st->ops.st=st; | |
378 | st->ops.log=logfile_log; | |
379 | st->ops.vlog=logfile_vlog; | |
380 | st->f=stderr; /* XXX ignore args */ | |
381 | ||
382 | return new_closure(&st->cl); | |
383 | } | |
384 | ||
385 | static char *phases[NR_PHASES]={ | |
386 | "PHASE_INIT", | |
387 | "PHASE_GETOPTS", | |
388 | "PHASE_READCONFIG", | |
389 | "PHASE_SETUP", | |
390 | "PHASE_DROPPRIV", | |
391 | "PHASE_RUN", | |
392 | "PHASE_SHUTDOWN" | |
393 | }; | |
394 | ||
395 | void enter_phase(uint32_t new_phase) | |
396 | { | |
397 | struct phase_hook *i; | |
398 | ||
399 | Message(M_DEBUG_PHASE,"entering %s... ", phases[new_phase]); | |
400 | current_phase=new_phase; | |
401 | ||
402 | for (i=hooks[new_phase]; i; i=i->next) | |
403 | i->fn(i->state, new_phase); | |
404 | Message(M_DEBUG_PHASE,"now in %s\n",phases[new_phase]); | |
405 | } | |
406 | ||
407 | bool_t add_hook(uint32_t phase, hook_fn *fn, void *state) | |
408 | { | |
409 | struct phase_hook *h; | |
410 | ||
411 | h=safe_malloc(sizeof(*h),"add_hook"); | |
412 | h->fn=fn; | |
413 | h->state=state; | |
414 | h->next=hooks[phase]; | |
415 | hooks[phase]=h; | |
416 | return True; | |
417 | } | |
418 | ||
419 | bool_t remove_hook(uint32_t phase, hook_fn *fn, void *state) | |
420 | { | |
421 | fatal("remove_hook: not implemented\n"); | |
422 | ||
423 | return False; | |
424 | } | |
425 | ||
426 | void log(struct log_if *lf, int priority, char *message, ...) | |
427 | { | |
428 | va_list ap; | |
429 | ||
430 | va_start(ap,message); | |
431 | lf->vlog(lf->st,priority,message,ap); | |
432 | va_end(ap); | |
433 | } | |
434 | ||
435 | struct buffer { | |
436 | closure_t cl; | |
437 | struct buffer_if ops; | |
438 | }; | |
439 | ||
440 | void buffer_assert_free(struct buffer_if *buffer, string_t file, uint32_t line) | |
441 | { | |
442 | if (!buffer->free) { | |
443 | fatal("BUF_ASSERT_FREE, %s line %d, owned by %s\n", | |
444 | file,line,buffer->owner); | |
445 | } | |
446 | } | |
447 | ||
448 | void buffer_assert_used(struct buffer_if *buffer, string_t file, uint32_t line) | |
449 | { | |
450 | if (buffer->free) { | |
451 | fatal("BUF_ASSERT_USED, %s line %d, last owned by %s\n", | |
452 | file,line,buffer->owner); | |
453 | } | |
454 | } | |
455 | ||
456 | void buffer_init(struct buffer_if *buffer, uint32_t max_start_pad) | |
457 | { | |
458 | buffer->start=buffer->base+max_start_pad; | |
459 | buffer->size=0; | |
460 | } | |
461 | ||
462 | void *buf_append(struct buffer_if *buf, uint32_t amount) { | |
463 | void *p; | |
464 | p=buf->start + buf->size; | |
465 | buf->size+=amount; | |
466 | return p; | |
467 | } | |
468 | ||
469 | void *buf_prepend(struct buffer_if *buf, uint32_t amount) { | |
470 | buf->size+=amount; | |
471 | return buf->start-=amount; | |
472 | } | |
473 | ||
474 | void *buf_unappend(struct buffer_if *buf, uint32_t amount) { | |
475 | if (buf->size < amount) return 0; | |
476 | return buf->start+(buf->size-=amount); | |
477 | } | |
478 | ||
479 | void *buf_unprepend(struct buffer_if *buf, uint32_t amount) { | |
480 | void *p; | |
481 | p=buf->start; | |
482 | buf->start+=amount; | |
483 | buf->size-=amount; | |
484 | return p; | |
485 | } | |
486 | ||
487 | /* Append a two-byte length and the string to the buffer. Length is in | |
488 | network byte order. */ | |
489 | void buf_append_string(struct buffer_if *buf, string_t s) | |
490 | { | |
491 | uint16_t len; | |
492 | ||
493 | len=strlen(s); | |
494 | *(uint16_t *)buf_append(buf,2)=htons(len); | |
495 | memcpy(buf_append(buf,len),s,len); | |
496 | } | |
497 | ||
498 | void buffer_new(struct buffer_if *buf, uint32_t len) | |
499 | { | |
500 | buf->free=True; | |
501 | buf->owner=NULL; | |
502 | buf->flags=0; | |
503 | buf->loc.file=NULL; | |
504 | buf->loc.line=0; | |
505 | buf->size=0; | |
506 | buf->len=len; | |
507 | buf->start=NULL; | |
508 | buf->base=safe_malloc(len,"buffer_new"); | |
509 | } | |
510 | ||
511 | static list_t *buffer_apply(closure_t *self, struct cloc loc, dict_t *context, | |
512 | list_t *args) | |
513 | { | |
514 | struct buffer *st; | |
515 | item_t *item; | |
516 | dict_t *dict; | |
517 | bool_t lockdown=False; | |
518 | ||
519 | st=safe_malloc(sizeof(*st),"buffer_apply"); | |
520 | st->cl.description="buffer"; | |
521 | st->cl.type=CL_BUFFER; | |
522 | st->cl.apply=NULL; | |
523 | st->cl.interface=&st->ops; | |
524 | st->ops.free=True; | |
525 | st->ops.owner=NULL; | |
526 | st->ops.flags=0; | |
527 | st->ops.loc=loc; | |
528 | st->ops.size=0; | |
529 | st->ops.len=DEFAULT_BUFFER_SIZE; | |
530 | st->ops.start=NULL; | |
531 | ||
532 | /* First argument, if present, is buffer length */ | |
533 | item=list_elem(args,0); | |
534 | if (item) { | |
535 | if (item->type!=t_number) { | |
536 | cfgfatal(st->ops.loc,"buffer","first parameter must be a " | |
537 | "number (buffer size)\n"); | |
538 | } | |
539 | st->ops.len=item->data.number; | |
540 | if (st->ops.len<MIN_BUFFER_SIZE) { | |
541 | cfgfatal(st->ops.loc,"buffer","ludicrously small buffer size\n"); | |
542 | } | |
543 | if (st->ops.len>MAX_BUFFER_SIZE) { | |
544 | cfgfatal(st->ops.loc,"buffer","ludicrously large buffer size\n"); | |
545 | } | |
546 | } | |
547 | /* Second argument, if present, is a dictionary */ | |
548 | item=list_elem(args,1); | |
549 | if (item) { | |
550 | if (item->type!=t_dict) { | |
551 | cfgfatal(st->ops.loc,"buffer","second parameter must be a " | |
552 | "dictionary\n"); | |
553 | } | |
554 | dict=item->data.dict; | |
555 | lockdown=dict_read_bool(dict,"lockdown",False,"buffer",st->ops.loc, | |
556 | False); | |
557 | } | |
558 | ||
559 | st->ops.base=safe_malloc(st->ops.len,"buffer"); | |
560 | if (lockdown) { | |
561 | Message(M_WARNING,"buffer: XXX lockdown\n"); | |
562 | } | |
563 | ||
564 | return new_closure(&st->cl); | |
565 | } | |
566 | ||
567 | init_module util_module; | |
568 | void util_module(dict_t *dict) | |
569 | { | |
570 | add_closure(dict,"logfile",logfile_apply); | |
571 | add_closure(dict,"sysbuffer",buffer_apply); | |
572 | } |