Commit | Line | Data |
---|---|---|
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 | ||
8689b3a9 | 11 | #include "secnet.h" |
2fe58dfd | 12 | #include <stdio.h> |
2fe58dfd SE |
13 | #include <string.h> |
14 | #include <errno.h> | |
2fe58dfd | 15 | #include <unistd.h> |
59635212 | 16 | #include <limits.h> |
2fe58dfd | 17 | #include <assert.h> |
4efd681a | 18 | #include <sys/wait.h> |
2fe58dfd | 19 | #include "util.h" |
59635212 | 20 | #include "unaligned.h" |
2fe58dfd SE |
21 | |
22 | #define MIN_BUFFER_SIZE 64 | |
23 | #define DEFAULT_BUFFER_SIZE 4096 | |
24 | #define MAX_BUFFER_SIZE 131072 | |
25 | ||
26 | static char *hexdigits="0123456789abcdef"; | |
27 | ||
28 | uint32_t message_level=M_WARNING|M_ERROR|M_FATAL; | |
29 | uint32_t syslog_level=M_WARNING|M_ERROR|M_FATAL; | |
30 | static uint32_t current_phase=0; | |
31 | ||
32 | struct phase_hook { | |
33 | hook_fn *fn; | |
34 | void *state; | |
35 | struct phase_hook *next; | |
36 | }; | |
37 | ||
38 | static struct phase_hook *hooks[NR_PHASES]={NULL,}; | |
39 | ||
40 | static void vMessage(uint32_t class, char *message, va_list args) | |
41 | { | |
42 | FILE *dest=stdout; | |
43 | if (class & message_level) { | |
44 | if (class&M_FATAL || class&M_ERROR || class&M_WARNING) { | |
45 | dest=stderr; | |
46 | } | |
47 | vfprintf(dest,message,args); | |
48 | } | |
49 | /* XXX do something about syslog output here */ | |
50 | #if 0 | |
51 | /* Maybe send message to syslog */ | |
52 | vsprintf(buff, message, args); | |
53 | /* XXX Send each line as a separate log entry */ | |
54 | log(syslog_prio[level], buff); | |
55 | #endif /* 0 */ | |
56 | } | |
57 | ||
58 | void Message(uint32_t class, char *message, ...) | |
59 | { | |
60 | va_list ap; | |
61 | ||
62 | va_start(ap,message); | |
63 | ||
64 | vMessage(class,message,ap); | |
65 | ||
66 | va_end(ap); | |
67 | } | |
68 | ||
69 | static void vfatal(int status, bool_t perror, char *message, va_list args) | |
70 | { | |
71 | int err; | |
72 | ||
73 | err=errno; | |
74 | ||
75 | enter_phase(PHASE_SHUTDOWN); | |
76 | if (perror) { | |
77 | Message(M_FATAL, "secnet fatal error: "); | |
78 | vMessage(M_FATAL, message, args); | |
79 | Message(M_FATAL, ": %s\n",strerror(err)); | |
80 | } | |
81 | else { | |
82 | Message(M_FATAL, "secnet fatal error: "); | |
83 | vMessage(M_FATAL,message,args); | |
84 | } | |
85 | exit(status); | |
86 | } | |
87 | ||
88 | void fatal(char *message, ...) | |
89 | { | |
90 | va_list args; | |
91 | va_start(args,message); | |
92 | vfatal(current_phase,False,message,args); | |
93 | va_end(args); | |
94 | } | |
95 | ||
96 | void fatal_status(int status, char *message, ...) | |
97 | { | |
98 | va_list args; | |
99 | va_start(args,message); | |
100 | vfatal(status,False,message,args); | |
101 | va_end(args); | |
102 | } | |
103 | ||
104 | void fatal_perror(char *message, ...) | |
105 | { | |
106 | va_list args; | |
107 | va_start(args,message); | |
108 | vfatal(current_phase,True,message,args); | |
109 | va_end(args); | |
110 | } | |
111 | ||
112 | void fatal_perror_status(int status, char *message, ...) | |
113 | { | |
114 | va_list args; | |
115 | va_start(args,message); | |
116 | vfatal(status,True,message,args); | |
117 | va_end(args); | |
118 | } | |
119 | ||
120 | void cfgfatal(struct cloc loc, string_t facility, char *message, ...) | |
121 | { | |
122 | va_list args; | |
123 | ||
124 | va_start(args,message); | |
125 | ||
126 | enter_phase(PHASE_SHUTDOWN); | |
127 | ||
128 | if (loc.file && loc.line) { | |
129 | Message(M_FATAL, "config error (%s, %s:%d): ",facility,loc.file, | |
130 | loc.line); | |
131 | } else if (!loc.file && loc.line) { | |
132 | Message(M_FATAL, "config error (%s, line %d): ",facility,loc.line); | |
133 | } else { | |
134 | Message(M_FATAL, "config error (%s): ",facility); | |
135 | } | |
136 | ||
137 | vMessage(M_FATAL,message,args); | |
138 | va_end(args); | |
139 | exit(current_phase); | |
140 | } | |
141 | ||
142 | char *safe_strdup(char *s, char *message) | |
143 | { | |
144 | char *d; | |
145 | d=strdup(s); | |
146 | if (!d) { | |
147 | fatal_perror(message); | |
148 | } | |
149 | return d; | |
150 | } | |
151 | ||
152 | void *safe_malloc(size_t size, char *message) | |
153 | { | |
154 | void *r; | |
155 | r=malloc(size); | |
156 | if (!r) { | |
157 | fatal_perror(message); | |
158 | } | |
159 | return r; | |
160 | } | |
161 | ||
162 | /* Convert a buffer into its MP_INT representation */ | |
163 | void read_mpbin(MP_INT *a, uint8_t *bin, int binsize) | |
164 | { | |
165 | char *buff; | |
166 | int i; | |
167 | ||
168 | buff=safe_malloc(binsize*2 + 1,"read_mpbin"); | |
169 | ||
170 | for (i=0; i<binsize; i++) { | |
171 | buff[i*2]=hexdigits[(bin[i] & 0xf0) >> 4]; | |
172 | buff[i*2+1]=hexdigits[(bin[i] & 0xf)]; | |
173 | } | |
174 | buff[binsize*2]=0; | |
175 | ||
176 | mpz_set_str(a, buff, 16); | |
177 | free(buff); | |
178 | } | |
179 | ||
180 | /* Convert a MP_INT into a hex string */ | |
181 | char *write_mpstring(MP_INT *a) | |
182 | { | |
183 | char *buff; | |
184 | ||
185 | buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring"); | |
186 | mpz_get_str(buff, 16, a); | |
187 | return buff; | |
188 | } | |
189 | ||
190 | static uint8_t hexval(uint8_t c) | |
191 | { | |
192 | switch (c) { | |
193 | case '0': return 0; | |
194 | case '1': return 1; | |
195 | case '2': return 2; | |
196 | case '3': return 3; | |
197 | case '4': return 4; | |
198 | case '5': return 5; | |
199 | case '6': return 6; | |
200 | case '7': return 7; | |
201 | case '8': return 8; | |
202 | case '9': return 9; | |
203 | case 'a': return 10; | |
204 | case 'A': return 10; | |
205 | case 'b': return 11; | |
206 | case 'B': return 11; | |
207 | case 'c': return 12; | |
208 | case 'C': return 12; | |
209 | case 'd': return 13; | |
210 | case 'D': return 13; | |
211 | case 'e': return 14; | |
212 | case 'E': return 14; | |
213 | case 'f': return 15; | |
214 | case 'F': return 15; | |
215 | } | |
216 | return -1; | |
217 | } | |
218 | ||
219 | /* Convert a MP_INT into a buffer; return length; truncate if necessary */ | |
220 | uint32_t write_mpbin(MP_INT *a, uint8_t *buffer, uint32_t buflen) | |
221 | { | |
222 | char *hb; | |
223 | int i,j,l; | |
224 | ||
225 | if (buflen==0) return 0; | |
226 | hb=write_mpstring(a); | |
227 | ||
228 | l=strlen(hb); | |
229 | i=0; j=0; | |
230 | if (l&1) { | |
231 | /* The number starts with a half-byte */ | |
232 | buffer[i++]=hexval(hb[j++]); | |
233 | } | |
234 | for (; hb[j] && i<buflen; i++) { | |
235 | buffer[i]=(hexval(hb[j])<<4)|hexval(hb[j+1]); | |
236 | j+=2; | |
237 | } | |
238 | free(hb); | |
239 | return i; | |
240 | } | |
241 | ||
70dc107b SE |
242 | bool_t subnet_match(struct subnet *s, uint32_t address) |
243 | { | |
244 | return (s->prefix==(address&s->mask)); | |
245 | } | |
246 | ||
247 | bool_t subnet_matches_list(struct subnet_list *list, uint32_t address) | |
2fe58dfd SE |
248 | { |
249 | uint32_t i; | |
250 | for (i=0; i<list->entries; i++) { | |
251 | if (list->list[i].prefix == (address&list->list[i].mask)) return True; | |
252 | } | |
253 | return False; | |
254 | } | |
255 | ||
baa06aeb SE |
256 | bool_t subnets_intersect(struct subnet a, struct subnet b) |
257 | { | |
258 | uint32_t mask=a.mask&b.mask; | |
259 | return ((a.prefix&mask)==(b.prefix&mask)); | |
260 | } | |
261 | ||
262 | bool_t subnet_intersects_with_list(struct subnet a, struct subnet_list *b) | |
263 | { | |
264 | uint32_t i; | |
265 | ||
266 | for (i=0; i<b->entries; i++) { | |
267 | if (subnets_intersect(a,b->list[i])) return True; | |
268 | } | |
269 | return False; | |
270 | } | |
271 | ||
272 | bool_t subnet_lists_intersect(struct subnet_list *a, struct subnet_list *b) | |
273 | { | |
274 | uint32_t i; | |
275 | for (i=0; i<a->entries; i++) { | |
276 | if (subnet_intersects_with_list(a->list[i],b)) return True; | |
277 | } | |
278 | return False; | |
279 | } | |
280 | ||
2fe58dfd SE |
281 | /* The string buffer must be at least 16 bytes long */ |
282 | string_t ipaddr_to_string(uint32_t addr) | |
283 | { | |
284 | uint8_t a,b,c,d; | |
285 | string_t s; | |
286 | ||
287 | s=safe_malloc(16,"ipaddr_to_string"); | |
288 | a=addr>>24; | |
289 | b=addr>>16; | |
290 | c=addr>>8; | |
291 | d=addr; | |
292 | snprintf(s, 16, "%d.%d.%d.%d", a, b, c, d); | |
293 | return s; | |
294 | } | |
295 | ||
296 | string_t subnet_to_string(struct subnet *sn) | |
297 | { | |
298 | uint32_t mask=sn->mask, addr=sn->prefix; | |
299 | uint8_t a,b,c,d; | |
300 | string_t s; | |
301 | int i; | |
302 | ||
303 | s=safe_malloc(19,"subnet_to_string"); | |
304 | a=addr>>24; | |
305 | b=addr>>16; | |
306 | c=addr>>8; | |
307 | d=addr; | |
308 | for (i=0; mask; i++) { | |
309 | mask=(mask<<1); | |
310 | } | |
70dc107b SE |
311 | if (i!=sn->len) { |
312 | fatal("subnet_to_string: invalid subnet structure!\n"); | |
313 | } | |
314 | snprintf(s, 19, "%d.%d.%d.%d/%d", a, b, c, d, sn->len); | |
2fe58dfd SE |
315 | return s; |
316 | } | |
317 | ||
4efd681a SE |
318 | int sys_cmd(const char *path, char *arg, ...) |
319 | { | |
320 | va_list ap; | |
321 | int rv; | |
322 | pid_t c; | |
323 | ||
324 | va_start(ap,arg); | |
325 | c=fork(); | |
326 | if (c) { | |
327 | /* Parent -> wait for child */ | |
328 | waitpid(c,&rv,0); | |
329 | } else if (c==0) { | |
330 | char *args[100]; | |
331 | int i; | |
332 | /* Child -> exec command */ | |
333 | args[0]=arg; | |
334 | i=1; | |
335 | while ((args[i++]=va_arg(ap,char *))); | |
336 | execvp(path,args); | |
337 | exit(1); | |
338 | } else { | |
339 | /* Error */ | |
340 | fatal_perror("sys_cmd(%s,%s,...)"); | |
341 | } | |
342 | ||
343 | va_end(ap); | |
344 | return rv; | |
345 | } | |
346 | ||
2fe58dfd SE |
347 | /* Take a list of log closures and merge them */ |
348 | struct loglist { | |
349 | struct log_if *l; | |
350 | struct loglist *next; | |
351 | }; | |
352 | ||
353 | static void log_vmulti(void *state, int priority, char *message, va_list args) | |
354 | { | |
355 | struct loglist *st=state, *i; | |
356 | ||
357 | for (i=st; i; i=i->next) { | |
358 | i->l->vlog(i->l->st,priority,message,args); | |
359 | } | |
360 | } | |
361 | ||
362 | static void log_multi(void *st, int priority, char *message, ...) | |
363 | { | |
364 | va_list ap; | |
365 | ||
366 | va_start(ap,message); | |
367 | ||
368 | log_vmulti(st,priority,message,ap); | |
369 | ||
370 | va_end(ap); | |
371 | } | |
372 | ||
373 | struct log_if *init_log(list_t *ll) | |
374 | { | |
375 | int i=0; | |
376 | item_t *item; | |
377 | closure_t *cl; | |
378 | struct loglist *l=NULL, *n; | |
379 | struct log_if *r; | |
380 | ||
381 | while ((item=list_elem(ll,i++))) { | |
382 | if (item->type!=t_closure) { | |
383 | cfgfatal(item->loc,"init_log","item is not a closure"); | |
384 | } | |
385 | cl=item->data.closure; | |
386 | if (cl->type!=CL_LOG) { | |
387 | cfgfatal(item->loc,"init_log","closure is not a logger"); | |
388 | } | |
389 | n=safe_malloc(sizeof(*n),"init_log"); | |
390 | n->l=cl->interface; | |
391 | n->next=l; | |
392 | l=n; | |
393 | } | |
394 | if (!l) { | |
395 | fatal("init_log: none of the items in the list are loggers"); | |
396 | } | |
397 | r=safe_malloc(sizeof(*r), "init_log"); | |
398 | r->st=l; | |
399 | r->log=log_multi; | |
400 | r->vlog=log_vmulti; | |
401 | return r; | |
402 | } | |
403 | ||
404 | struct logfile { | |
405 | closure_t cl; | |
406 | struct log_if ops; | |
407 | FILE *f; | |
408 | }; | |
409 | ||
410 | static void logfile_vlog(void *state, int priority, char *message, | |
411 | va_list args) | |
412 | { | |
413 | struct logfile *st=state; | |
414 | ||
415 | vfprintf(st->f,message,args); | |
416 | fprintf(st->f,"\n"); | |
417 | } | |
418 | ||
419 | static void logfile_log(void *state, int priority, char *message, ...) | |
420 | { | |
421 | va_list ap; | |
422 | ||
423 | va_start(ap,message); | |
424 | logfile_vlog(state,priority,message,ap); | |
425 | va_end(ap); | |
426 | } | |
427 | ||
428 | static list_t *logfile_apply(closure_t *self, struct cloc loc, dict_t *context, | |
429 | list_t *data) | |
430 | { | |
431 | struct logfile *st; | |
432 | ||
433 | st=safe_malloc(sizeof(*st),"logfile_apply"); | |
434 | st->cl.description="logfile"; | |
435 | st->cl.type=CL_LOG; | |
436 | st->cl.apply=NULL; | |
437 | st->cl.interface=&st->ops; | |
438 | st->ops.st=st; | |
439 | st->ops.log=logfile_log; | |
440 | st->ops.vlog=logfile_vlog; | |
441 | st->f=stderr; /* XXX ignore args */ | |
442 | ||
443 | return new_closure(&st->cl); | |
444 | } | |
445 | ||
446 | static char *phases[NR_PHASES]={ | |
447 | "PHASE_INIT", | |
448 | "PHASE_GETOPTS", | |
449 | "PHASE_READCONFIG", | |
450 | "PHASE_SETUP", | |
baa06aeb | 451 | "PHASE_GETRESOURCES", |
2fe58dfd SE |
452 | "PHASE_DROPPRIV", |
453 | "PHASE_RUN", | |
454 | "PHASE_SHUTDOWN" | |
455 | }; | |
456 | ||
457 | void enter_phase(uint32_t new_phase) | |
458 | { | |
459 | struct phase_hook *i; | |
460 | ||
baa06aeb SE |
461 | if (hooks[new_phase]) |
462 | Message(M_DEBUG_PHASE,"Running hooks for %s...\n", phases[new_phase]); | |
2fe58dfd SE |
463 | current_phase=new_phase; |
464 | ||
465 | for (i=hooks[new_phase]; i; i=i->next) | |
466 | i->fn(i->state, new_phase); | |
baa06aeb | 467 | Message(M_DEBUG_PHASE,"Now in %s\n",phases[new_phase]); |
2fe58dfd SE |
468 | } |
469 | ||
470 | bool_t add_hook(uint32_t phase, hook_fn *fn, void *state) | |
471 | { | |
472 | struct phase_hook *h; | |
473 | ||
474 | h=safe_malloc(sizeof(*h),"add_hook"); | |
475 | h->fn=fn; | |
476 | h->state=state; | |
477 | h->next=hooks[phase]; | |
478 | hooks[phase]=h; | |
479 | return True; | |
480 | } | |
481 | ||
482 | bool_t remove_hook(uint32_t phase, hook_fn *fn, void *state) | |
483 | { | |
484 | fatal("remove_hook: not implemented\n"); | |
485 | ||
486 | return False; | |
487 | } | |
488 | ||
489 | void log(struct log_if *lf, int priority, char *message, ...) | |
490 | { | |
491 | va_list ap; | |
492 | ||
493 | va_start(ap,message); | |
494 | lf->vlog(lf->st,priority,message,ap); | |
495 | va_end(ap); | |
496 | } | |
497 | ||
498 | struct buffer { | |
499 | closure_t cl; | |
500 | struct buffer_if ops; | |
501 | }; | |
502 | ||
503 | void buffer_assert_free(struct buffer_if *buffer, string_t file, uint32_t line) | |
504 | { | |
505 | if (!buffer->free) { | |
506 | fatal("BUF_ASSERT_FREE, %s line %d, owned by %s\n", | |
507 | file,line,buffer->owner); | |
508 | } | |
509 | } | |
510 | ||
511 | void buffer_assert_used(struct buffer_if *buffer, string_t file, uint32_t line) | |
512 | { | |
513 | if (buffer->free) { | |
514 | fatal("BUF_ASSERT_USED, %s line %d, last owned by %s\n", | |
515 | file,line,buffer->owner); | |
516 | } | |
517 | } | |
518 | ||
519 | void buffer_init(struct buffer_if *buffer, uint32_t max_start_pad) | |
520 | { | |
521 | buffer->start=buffer->base+max_start_pad; | |
522 | buffer->size=0; | |
523 | } | |
524 | ||
525 | void *buf_append(struct buffer_if *buf, uint32_t amount) { | |
526 | void *p; | |
527 | p=buf->start + buf->size; | |
528 | buf->size+=amount; | |
529 | return p; | |
530 | } | |
531 | ||
532 | void *buf_prepend(struct buffer_if *buf, uint32_t amount) { | |
533 | buf->size+=amount; | |
534 | return buf->start-=amount; | |
535 | } | |
536 | ||
537 | void *buf_unappend(struct buffer_if *buf, uint32_t amount) { | |
538 | if (buf->size < amount) return 0; | |
539 | return buf->start+(buf->size-=amount); | |
540 | } | |
541 | ||
542 | void *buf_unprepend(struct buffer_if *buf, uint32_t amount) { | |
543 | void *p; | |
544 | p=buf->start; | |
545 | buf->start+=amount; | |
546 | buf->size-=amount; | |
547 | return p; | |
548 | } | |
549 | ||
550 | /* Append a two-byte length and the string to the buffer. Length is in | |
551 | network byte order. */ | |
552 | void buf_append_string(struct buffer_if *buf, string_t s) | |
553 | { | |
554 | uint16_t len; | |
555 | ||
556 | len=strlen(s); | |
59635212 | 557 | buf_append_uint16(buf,len); |
2fe58dfd SE |
558 | memcpy(buf_append(buf,len),s,len); |
559 | } | |
560 | ||
561 | void buffer_new(struct buffer_if *buf, uint32_t len) | |
562 | { | |
563 | buf->free=True; | |
564 | buf->owner=NULL; | |
565 | buf->flags=0; | |
566 | buf->loc.file=NULL; | |
567 | buf->loc.line=0; | |
568 | buf->size=0; | |
569 | buf->len=len; | |
570 | buf->start=NULL; | |
571 | buf->base=safe_malloc(len,"buffer_new"); | |
572 | } | |
573 | ||
574 | static list_t *buffer_apply(closure_t *self, struct cloc loc, dict_t *context, | |
575 | list_t *args) | |
576 | { | |
577 | struct buffer *st; | |
578 | item_t *item; | |
579 | dict_t *dict; | |
580 | bool_t lockdown=False; | |
4efd681a | 581 | uint32_t len=DEFAULT_BUFFER_SIZE; |
2fe58dfd SE |
582 | |
583 | st=safe_malloc(sizeof(*st),"buffer_apply"); | |
584 | st->cl.description="buffer"; | |
585 | st->cl.type=CL_BUFFER; | |
586 | st->cl.apply=NULL; | |
587 | st->cl.interface=&st->ops; | |
2fe58dfd SE |
588 | |
589 | /* First argument, if present, is buffer length */ | |
590 | item=list_elem(args,0); | |
591 | if (item) { | |
592 | if (item->type!=t_number) { | |
593 | cfgfatal(st->ops.loc,"buffer","first parameter must be a " | |
594 | "number (buffer size)\n"); | |
595 | } | |
4efd681a SE |
596 | len=item->data.number; |
597 | if (len<MIN_BUFFER_SIZE) { | |
2fe58dfd SE |
598 | cfgfatal(st->ops.loc,"buffer","ludicrously small buffer size\n"); |
599 | } | |
4efd681a | 600 | if (len>MAX_BUFFER_SIZE) { |
2fe58dfd SE |
601 | cfgfatal(st->ops.loc,"buffer","ludicrously large buffer size\n"); |
602 | } | |
603 | } | |
604 | /* Second argument, if present, is a dictionary */ | |
605 | item=list_elem(args,1); | |
606 | if (item) { | |
607 | if (item->type!=t_dict) { | |
608 | cfgfatal(st->ops.loc,"buffer","second parameter must be a " | |
609 | "dictionary\n"); | |
610 | } | |
611 | dict=item->data.dict; | |
612 | lockdown=dict_read_bool(dict,"lockdown",False,"buffer",st->ops.loc, | |
613 | False); | |
614 | } | |
615 | ||
4efd681a | 616 | buffer_new(&st->ops,len); |
2fe58dfd | 617 | if (lockdown) { |
70dc107b | 618 | /* XXX mlock the buffer if possible */ |
2fe58dfd SE |
619 | } |
620 | ||
621 | return new_closure(&st->cl); | |
622 | } | |
623 | ||
624 | init_module util_module; | |
625 | void util_module(dict_t *dict) | |
626 | { | |
627 | add_closure(dict,"logfile",logfile_apply); | |
628 | add_closure(dict,"sysbuffer",buffer_apply); | |
629 | } |