mdw@git.distorted.org.uk Git - secnet/blob - util.c

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