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