| 1 | /* |
| 2 | * util.c |
| 3 | * - output and logging support |
| 4 | * - program lifetime support |
| 5 | * - IP address and subnet munging routines |
| 6 | * - MPI convenience functions |
| 7 | */ |
| 8 | /* |
| 9 | * This file is |
| 10 | * Copyright (C) 1995--2001 Stephen Early <steve@greenend.org.uk> |
| 11 | * |
| 12 | * It is part of secnet, which is |
| 13 | * Copyright (C) 1995--2001 Stephen Early <steve@greenend.org.uk> |
| 14 | * Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License as published by |
| 18 | * the Free Software Foundation; either version 2, or (at your option) |
| 19 | * any later version. |
| 20 | * |
| 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | * GNU General Public License for more details. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License |
| 27 | * along with this program; if not, write to the Free Software Foundation, |
| 28 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 29 | */ |
| 30 | |
| 31 | #include "secnet.h" |
| 32 | #include <stdio.h> |
| 33 | #include <string.h> |
| 34 | #include <errno.h> |
| 35 | #include <syslog.h> |
| 36 | #include <unistd.h> |
| 37 | #include <limits.h> |
| 38 | #include <assert.h> |
| 39 | #include <sys/wait.h> |
| 40 | #include <time.h> |
| 41 | #include "util.h" |
| 42 | #include "unaligned.h" |
| 43 | |
| 44 | #define MIN_BUFFER_SIZE 64 |
| 45 | #define DEFAULT_BUFFER_SIZE 4096 |
| 46 | #define MAX_BUFFER_SIZE 131072 |
| 47 | |
| 48 | static char *hexdigits="0123456789abcdef"; |
| 49 | |
| 50 | bool_t secnet_is_daemon=False; |
| 51 | uint32_t message_level=M_WARNING|M_ERROR|M_SECURITY|M_FATAL; |
| 52 | struct log_if *system_log=NULL; |
| 53 | static uint32_t current_phase=0; |
| 54 | |
| 55 | struct phase_hook { |
| 56 | hook_fn *fn; |
| 57 | void *state; |
| 58 | struct phase_hook *next; |
| 59 | }; |
| 60 | |
| 61 | static struct phase_hook *hooks[NR_PHASES]={NULL,}; |
| 62 | |
| 63 | static void vMessage(uint32_t class, char *message, va_list args) |
| 64 | { |
| 65 | FILE *dest=stdout; |
| 66 | #define MESSAGE_BUFLEN 1023 |
| 67 | static char buff[MESSAGE_BUFLEN+1]={0,}; |
| 68 | uint32_t bp; |
| 69 | char *nlp; |
| 70 | |
| 71 | if (secnet_is_daemon) { |
| 72 | /* Messages go to the system log interface */ |
| 73 | bp=strlen(buff); |
| 74 | vsnprintf(buff+bp,MESSAGE_BUFLEN-bp,message,args); |
| 75 | /* Each line is sent separately */ |
| 76 | while ((nlp=strchr(buff,'\n'))) { |
| 77 | *nlp=0; |
| 78 | log(system_log,class,buff); |
| 79 | memmove(buff,nlp+1,strlen(nlp+1)+1); |
| 80 | } |
| 81 | } else { |
| 82 | /* Messages go to stdout/stderr */ |
| 83 | if (class & message_level) { |
| 84 | if (class&M_FATAL || class&M_ERROR || class&M_WARNING) { |
| 85 | dest=stderr; |
| 86 | } |
| 87 | vfprintf(dest,message,args); |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | void Message(uint32_t class, char *message, ...) |
| 93 | { |
| 94 | va_list ap; |
| 95 | |
| 96 | va_start(ap,message); |
| 97 | vMessage(class,message,ap); |
| 98 | va_end(ap); |
| 99 | } |
| 100 | |
| 101 | static void vfatal(int status, bool_t perror, char *message, va_list args) |
| 102 | { |
| 103 | int err; |
| 104 | |
| 105 | err=errno; |
| 106 | |
| 107 | enter_phase(PHASE_SHUTDOWN); |
| 108 | if (perror) { |
| 109 | Message(M_FATAL, "secnet fatal error: "); |
| 110 | vMessage(M_FATAL, message, args); |
| 111 | Message(M_FATAL, ": %s\n",strerror(err)); |
| 112 | } |
| 113 | else { |
| 114 | Message(M_FATAL, "secnet fatal error: "); |
| 115 | vMessage(M_FATAL,message,args); |
| 116 | } |
| 117 | exit(status); |
| 118 | } |
| 119 | |
| 120 | void fatal(char *message, ...) |
| 121 | { |
| 122 | va_list args; |
| 123 | va_start(args,message); |
| 124 | vfatal(current_phase,False,message,args); |
| 125 | va_end(args); |
| 126 | } |
| 127 | |
| 128 | void fatal_status(int status, char *message, ...) |
| 129 | { |
| 130 | va_list args; |
| 131 | va_start(args,message); |
| 132 | vfatal(status,False,message,args); |
| 133 | va_end(args); |
| 134 | } |
| 135 | |
| 136 | void fatal_perror(char *message, ...) |
| 137 | { |
| 138 | va_list args; |
| 139 | va_start(args,message); |
| 140 | vfatal(current_phase,True,message,args); |
| 141 | va_end(args); |
| 142 | } |
| 143 | |
| 144 | void fatal_perror_status(int status, char *message, ...) |
| 145 | { |
| 146 | va_list args; |
| 147 | va_start(args,message); |
| 148 | vfatal(status,True,message,args); |
| 149 | va_end(args); |
| 150 | } |
| 151 | |
| 152 | void cfgfatal(struct cloc loc, string_t facility, char *message, ...) |
| 153 | { |
| 154 | va_list args; |
| 155 | |
| 156 | va_start(args,message); |
| 157 | |
| 158 | enter_phase(PHASE_SHUTDOWN); |
| 159 | |
| 160 | if (loc.file && loc.line) { |
| 161 | Message(M_FATAL, "config error (%s, %s:%d): ",facility,loc.file, |
| 162 | loc.line); |
| 163 | } else if (!loc.file && loc.line) { |
| 164 | Message(M_FATAL, "config error (%s, line %d): ",facility,loc.line); |
| 165 | } else { |
| 166 | Message(M_FATAL, "config error (%s): ",facility); |
| 167 | } |
| 168 | |
| 169 | vMessage(M_FATAL,message,args); |
| 170 | va_end(args); |
| 171 | exit(current_phase); |
| 172 | } |
| 173 | |
| 174 | /* Take a list of log closures and merge them */ |
| 175 | struct loglist { |
| 176 | struct log_if *l; |
| 177 | struct loglist *next; |
| 178 | }; |
| 179 | |
| 180 | static void log_vmulti(void *sst, int class, char *message, va_list args) |
| 181 | { |
| 182 | struct loglist *st=sst, *i; |
| 183 | |
| 184 | if (secnet_is_daemon) { |
| 185 | for (i=st; i; i=i->next) { |
| 186 | i->l->vlog(i->l->st,class,message,args); |
| 187 | } |
| 188 | } else { |
| 189 | vMessage(class,message,args); |
| 190 | Message(class,"\n"); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | static void log_multi(void *st, int priority, char *message, ...) |
| 195 | { |
| 196 | va_list ap; |
| 197 | |
| 198 | va_start(ap,message); |
| 199 | log_vmulti(st,priority,message,ap); |
| 200 | va_end(ap); |
| 201 | } |
| 202 | |
| 203 | struct log_if *init_log(list_t *ll) |
| 204 | { |
| 205 | int i=0; |
| 206 | item_t *item; |
| 207 | closure_t *cl; |
| 208 | struct loglist *l=NULL, *n; |
| 209 | struct log_if *r; |
| 210 | |
| 211 | if (list_length(ll)==1) { |
| 212 | item=list_elem(ll,0); |
| 213 | cl=item->data.closure; |
| 214 | if (cl->type!=CL_LOG) { |
| 215 | cfgfatal(item->loc,"init_log","closure is not a logger"); |
| 216 | } |
| 217 | return cl->interface; |
| 218 | } |
| 219 | while ((item=list_elem(ll,i++))) { |
| 220 | if (item->type!=t_closure) { |
| 221 | cfgfatal(item->loc,"init_log","item is not a closure"); |
| 222 | } |
| 223 | cl=item->data.closure; |
| 224 | if (cl->type!=CL_LOG) { |
| 225 | cfgfatal(item->loc,"init_log","closure is not a logger"); |
| 226 | } |
| 227 | n=safe_malloc(sizeof(*n),"init_log"); |
| 228 | n->l=cl->interface; |
| 229 | n->next=l; |
| 230 | l=n; |
| 231 | } |
| 232 | if (!l) { |
| 233 | fatal("init_log: no log"); |
| 234 | } |
| 235 | r=safe_malloc(sizeof(*r), "init_log"); |
| 236 | r->st=l; |
| 237 | r->log=log_multi; |
| 238 | r->vlog=log_vmulti; |
| 239 | return r; |
| 240 | } |
| 241 | |
| 242 | struct logfile { |
| 243 | closure_t cl; |
| 244 | struct log_if ops; |
| 245 | struct cloc loc; |
| 246 | string_t logfile; |
| 247 | uint32_t level; |
| 248 | FILE *f; |
| 249 | }; |
| 250 | |
| 251 | static string_t months[]={ |
| 252 | "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"}; |
| 253 | |
| 254 | static void logfile_vlog(void *sst, int class, char *message, va_list args) |
| 255 | { |
| 256 | struct logfile *st=sst; |
| 257 | time_t t; |
| 258 | struct tm *tm; |
| 259 | |
| 260 | if (secnet_is_daemon) { |
| 261 | if (class&st->level) { |
| 262 | t=time(NULL); |
| 263 | tm=localtime(&t); |
| 264 | fprintf(st->f,"%s %2d %02d:%02d:%02d ", |
| 265 | months[tm->tm_mon],tm->tm_mday,tm->tm_hour,tm->tm_min, |
| 266 | tm->tm_sec); |
| 267 | vfprintf(st->f,message,args); |
| 268 | fprintf(st->f,"\n"); |
| 269 | fflush(st->f); |
| 270 | } |
| 271 | } else { |
| 272 | vMessage(class,message,args); |
| 273 | Message(class,"\n"); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | static void logfile_log(void *state, int priority, char *message, ...) |
| 278 | { |
| 279 | va_list ap; |
| 280 | |
| 281 | va_start(ap,message); |
| 282 | logfile_vlog(state,priority,message,ap); |
| 283 | va_end(ap); |
| 284 | } |
| 285 | |
| 286 | static void logfile_phase_hook(void *sst, uint32_t new_phase) |
| 287 | { |
| 288 | struct logfile *st=sst; |
| 289 | FILE *f; |
| 290 | |
| 291 | if (background) { |
| 292 | f=fopen(st->logfile,"a"); |
| 293 | if (!f) fatal_perror("logfile (%s:%d): cannot open \"%s\"", |
| 294 | st->loc.file,st->loc.line,st->logfile); |
| 295 | st->f=f; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | static struct flagstr message_class_table[]={ |
| 300 | { "debug-config", M_DEBUG_CONFIG }, |
| 301 | { "debug-phase", M_DEBUG_PHASE }, |
| 302 | { "debug", M_DEBUG }, |
| 303 | { "all-debug", M_DEBUG|M_DEBUG_PHASE|M_DEBUG_CONFIG }, |
| 304 | { "info", M_INFO }, |
| 305 | { "notice", M_NOTICE }, |
| 306 | { "warning", M_WARNING }, |
| 307 | { "error", M_ERROR }, |
| 308 | { "security", M_SECURITY }, |
| 309 | { "fatal", M_FATAL }, |
| 310 | { "default", M_WARNING|M_ERROR|M_SECURITY|M_FATAL }, |
| 311 | { "verbose", M_INFO|M_NOTICE|M_WARNING|M_ERROR|M_SECURITY|M_FATAL }, |
| 312 | { "quiet", M_FATAL }, |
| 313 | { NULL, 0 } |
| 314 | }; |
| 315 | |
| 316 | static list_t *logfile_apply(closure_t *self, struct cloc loc, dict_t *context, |
| 317 | list_t *args) |
| 318 | { |
| 319 | struct logfile *st; |
| 320 | item_t *item; |
| 321 | dict_t *dict; |
| 322 | |
| 323 | /* We should defer opening the logfile until the getresources |
| 324 | phase. We should defer writing into the logfile until after we |
| 325 | become a daemon. */ |
| 326 | |
| 327 | st=safe_malloc(sizeof(*st),"logfile_apply"); |
| 328 | st->cl.description="logfile"; |
| 329 | st->cl.type=CL_LOG; |
| 330 | st->cl.apply=NULL; |
| 331 | st->cl.interface=&st->ops; |
| 332 | st->ops.st=st; |
| 333 | st->ops.log=logfile_log; |
| 334 | st->ops.vlog=logfile_vlog; |
| 335 | st->loc=loc; |
| 336 | st->f=stderr; |
| 337 | |
| 338 | item=list_elem(args,0); |
| 339 | if (!item || item->type!=t_dict) { |
| 340 | cfgfatal(loc,"logfile","argument must be a dictionary\n"); |
| 341 | } |
| 342 | dict=item->data.dict; |
| 343 | |
| 344 | st->logfile=dict_read_string(dict,"filename",True,"logfile",loc); |
| 345 | st->level=string_list_to_word(dict_lookup(dict,"class"), |
| 346 | message_class_table,"logfile"); |
| 347 | |
| 348 | add_hook(PHASE_GETRESOURCES,logfile_phase_hook,st); |
| 349 | |
| 350 | return new_closure(&st->cl); |
| 351 | } |
| 352 | |
| 353 | struct syslog { |
| 354 | closure_t cl; |
| 355 | struct log_if ops; |
| 356 | string_t ident; |
| 357 | int facility; |
| 358 | bool_t open; |
| 359 | }; |
| 360 | |
| 361 | static int msgclass_to_syslogpriority(uint32_t m) |
| 362 | { |
| 363 | switch (m) { |
| 364 | case M_DEBUG_CONFIG: return LOG_DEBUG; |
| 365 | case M_DEBUG_PHASE: return LOG_DEBUG; |
| 366 | case M_DEBUG: return LOG_DEBUG; |
| 367 | case M_INFO: return LOG_INFO; |
| 368 | case M_NOTICE: return LOG_NOTICE; |
| 369 | case M_WARNING: return LOG_WARNING; |
| 370 | case M_ERROR: return LOG_ERR; |
| 371 | case M_SECURITY: return LOG_CRIT; |
| 372 | case M_FATAL: return LOG_EMERG; |
| 373 | default: return LOG_NOTICE; |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | static void syslog_vlog(void *sst, int class, char *message, |
| 378 | va_list args) |
| 379 | { |
| 380 | struct syslog *st=sst; |
| 381 | |
| 382 | if (st->open) |
| 383 | vsyslog(msgclass_to_syslogpriority(class),message,args); |
| 384 | else { |
| 385 | vMessage(class,message,args); |
| 386 | Message(class,"\n"); |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | static void syslog_log(void *sst, int priority, char *message, ...) |
| 391 | { |
| 392 | va_list ap; |
| 393 | |
| 394 | va_start(ap,message); |
| 395 | syslog_vlog(sst,priority,message,ap); |
| 396 | va_end(ap); |
| 397 | } |
| 398 | |
| 399 | static struct flagstr syslog_facility_table[]={ |
| 400 | { "authpriv", LOG_AUTHPRIV }, |
| 401 | { "cron", LOG_CRON }, |
| 402 | { "daemon", LOG_DAEMON }, |
| 403 | { "kern", LOG_KERN }, |
| 404 | { "local0", LOG_LOCAL0 }, |
| 405 | { "local1", LOG_LOCAL1 }, |
| 406 | { "local2", LOG_LOCAL2 }, |
| 407 | { "local3", LOG_LOCAL3 }, |
| 408 | { "local4", LOG_LOCAL4 }, |
| 409 | { "local5", LOG_LOCAL5 }, |
| 410 | { "local6", LOG_LOCAL6 }, |
| 411 | { "local7", LOG_LOCAL7 }, |
| 412 | { "lpr", LOG_LPR }, |
| 413 | { "mail", LOG_MAIL }, |
| 414 | { "news", LOG_NEWS }, |
| 415 | { "syslog", LOG_SYSLOG }, |
| 416 | { "user", LOG_USER }, |
| 417 | { "uucp", LOG_UUCP }, |
| 418 | { NULL, 0 } |
| 419 | }; |
| 420 | |
| 421 | static void syslog_phase_hook(void *sst, uint32_t newphase) |
| 422 | { |
| 423 | struct syslog *st=sst; |
| 424 | |
| 425 | if (background) { |
| 426 | openlog(st->ident,0,st->facility); |
| 427 | st->open=True; |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | static list_t *syslog_apply(closure_t *self, struct cloc loc, dict_t *context, |
| 432 | list_t *args) |
| 433 | { |
| 434 | struct syslog *st; |
| 435 | dict_t *d; |
| 436 | item_t *item; |
| 437 | string_t facstr; |
| 438 | |
| 439 | st=safe_malloc(sizeof(*st),"syslog_apply"); |
| 440 | st->cl.description="syslog"; |
| 441 | st->cl.type=CL_LOG; |
| 442 | st->cl.apply=NULL; |
| 443 | st->cl.interface=&st->ops; |
| 444 | st->ops.st=st; |
| 445 | st->ops.log=syslog_log; |
| 446 | st->ops.vlog=syslog_vlog; |
| 447 | |
| 448 | item=list_elem(args,0); |
| 449 | if (!item || item->type!=t_dict) |
| 450 | cfgfatal(loc,"syslog","parameter must be a dictionary\n"); |
| 451 | d=item->data.dict; |
| 452 | |
| 453 | st->ident=dict_read_string(d, "ident", False, "syslog", loc); |
| 454 | facstr=dict_read_string(d, "facility", True, "syslog", loc); |
| 455 | st->facility=string_to_word(facstr,loc, |
| 456 | syslog_facility_table,"syslog"); |
| 457 | st->open=False; |
| 458 | add_hook(PHASE_GETRESOURCES,syslog_phase_hook,st); |
| 459 | |
| 460 | return new_closure(&st->cl); |
| 461 | } |
| 462 | |
| 463 | char *safe_strdup(char *s, char *message) |
| 464 | { |
| 465 | char *d; |
| 466 | d=strdup(s); |
| 467 | if (!d) { |
| 468 | fatal_perror(message); |
| 469 | } |
| 470 | return d; |
| 471 | } |
| 472 | |
| 473 | void *safe_malloc(size_t size, char *message) |
| 474 | { |
| 475 | void *r; |
| 476 | r=malloc(size); |
| 477 | if (!r) { |
| 478 | fatal_perror(message); |
| 479 | } |
| 480 | return r; |
| 481 | } |
| 482 | |
| 483 | /* Convert a buffer into its MP_INT representation */ |
| 484 | void read_mpbin(MP_INT *a, uint8_t *bin, int binsize) |
| 485 | { |
| 486 | char *buff; |
| 487 | int i; |
| 488 | |
| 489 | buff=safe_malloc(binsize*2 + 1,"read_mpbin"); |
| 490 | |
| 491 | for (i=0; i<binsize; i++) { |
| 492 | buff[i*2]=hexdigits[(bin[i] & 0xf0) >> 4]; |
| 493 | buff[i*2+1]=hexdigits[(bin[i] & 0xf)]; |
| 494 | } |
| 495 | buff[binsize*2]=0; |
| 496 | |
| 497 | mpz_set_str(a, buff, 16); |
| 498 | free(buff); |
| 499 | } |
| 500 | |
| 501 | /* Convert a MP_INT into a hex string */ |
| 502 | char *write_mpstring(MP_INT *a) |
| 503 | { |
| 504 | char *buff; |
| 505 | |
| 506 | buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring"); |
| 507 | mpz_get_str(buff, 16, a); |
| 508 | return buff; |
| 509 | } |
| 510 | |
| 511 | static uint8_t hexval(uint8_t c) |
| 512 | { |
| 513 | switch (c) { |
| 514 | case '0': return 0; |
| 515 | case '1': return 1; |
| 516 | case '2': return 2; |
| 517 | case '3': return 3; |
| 518 | case '4': return 4; |
| 519 | case '5': return 5; |
| 520 | case '6': return 6; |
| 521 | case '7': return 7; |
| 522 | case '8': return 8; |
| 523 | case '9': return 9; |
| 524 | case 'a': return 10; |
| 525 | case 'A': return 10; |
| 526 | case 'b': return 11; |
| 527 | case 'B': return 11; |
| 528 | case 'c': return 12; |
| 529 | case 'C': return 12; |
| 530 | case 'd': return 13; |
| 531 | case 'D': return 13; |
| 532 | case 'e': return 14; |
| 533 | case 'E': return 14; |
| 534 | case 'f': return 15; |
| 535 | case 'F': return 15; |
| 536 | } |
| 537 | return -1; |
| 538 | } |
| 539 | |
| 540 | /* Convert a MP_INT into a buffer; return length; truncate if necessary */ |
| 541 | uint32_t write_mpbin(MP_INT *a, uint8_t *buffer, uint32_t buflen) |
| 542 | { |
| 543 | char *hb; |
| 544 | int i,j,l; |
| 545 | |
| 546 | if (buflen==0) return 0; |
| 547 | hb=write_mpstring(a); |
| 548 | |
| 549 | l=strlen(hb); |
| 550 | i=0; j=0; |
| 551 | if (l&1) { |
| 552 | /* The number starts with a half-byte */ |
| 553 | buffer[i++]=hexval(hb[j++]); |
| 554 | } |
| 555 | for (; hb[j] && i<buflen; i++) { |
| 556 | buffer[i]=(hexval(hb[j])<<4)|hexval(hb[j+1]); |
| 557 | j+=2; |
| 558 | } |
| 559 | free(hb); |
| 560 | return i; |
| 561 | } |
| 562 | |
| 563 | bool_t subnet_match(struct subnet *s, uint32_t address) |
| 564 | { |
| 565 | return (s->prefix==(address&s->mask)); |
| 566 | } |
| 567 | |
| 568 | bool_t subnet_matches_list(struct subnet_list *list, uint32_t address) |
| 569 | { |
| 570 | uint32_t i; |
| 571 | for (i=0; i<list->entries; i++) { |
| 572 | if (list->list[i].prefix == (address&list->list[i].mask)) return True; |
| 573 | } |
| 574 | return False; |
| 575 | } |
| 576 | |
| 577 | bool_t subnets_intersect(struct subnet a, struct subnet b) |
| 578 | { |
| 579 | uint32_t mask=a.mask&b.mask; |
| 580 | return ((a.prefix&mask)==(b.prefix&mask)); |
| 581 | } |
| 582 | |
| 583 | bool_t subnet_intersects_with_list(struct subnet a, struct subnet_list *b) |
| 584 | { |
| 585 | uint32_t i; |
| 586 | |
| 587 | for (i=0; i<b->entries; i++) { |
| 588 | if (subnets_intersect(a,b->list[i])) return True; |
| 589 | } |
| 590 | return False; |
| 591 | } |
| 592 | |
| 593 | bool_t subnet_lists_intersect(struct subnet_list *a, struct subnet_list *b) |
| 594 | { |
| 595 | uint32_t i; |
| 596 | for (i=0; i<a->entries; i++) { |
| 597 | if (subnet_intersects_with_list(a->list[i],b)) return True; |
| 598 | } |
| 599 | return False; |
| 600 | } |
| 601 | |
| 602 | /* The string buffer must be at least 16 bytes long */ |
| 603 | string_t ipaddr_to_string(uint32_t addr) |
| 604 | { |
| 605 | uint8_t a,b,c,d; |
| 606 | string_t s; |
| 607 | |
| 608 | s=safe_malloc(16,"ipaddr_to_string"); |
| 609 | a=addr>>24; |
| 610 | b=addr>>16; |
| 611 | c=addr>>8; |
| 612 | d=addr; |
| 613 | snprintf(s, 16, "%d.%d.%d.%d", a, b, c, d); |
| 614 | return s; |
| 615 | } |
| 616 | |
| 617 | string_t subnet_to_string(struct subnet *sn) |
| 618 | { |
| 619 | uint32_t mask=sn->mask, addr=sn->prefix; |
| 620 | uint8_t a,b,c,d; |
| 621 | string_t s; |
| 622 | int i; |
| 623 | |
| 624 | s=safe_malloc(19,"subnet_to_string"); |
| 625 | a=addr>>24; |
| 626 | b=addr>>16; |
| 627 | c=addr>>8; |
| 628 | d=addr; |
| 629 | for (i=0; mask; i++) { |
| 630 | mask=(mask<<1); |
| 631 | } |
| 632 | if (i!=sn->len) { |
| 633 | fatal("subnet_to_string: invalid subnet structure!\n"); |
| 634 | } |
| 635 | snprintf(s, 19, "%d.%d.%d.%d/%d", a, b, c, d, sn->len); |
| 636 | return s; |
| 637 | } |
| 638 | |
| 639 | int sys_cmd(const char *path, char *arg, ...) |
| 640 | { |
| 641 | va_list ap; |
| 642 | int rv; |
| 643 | pid_t c; |
| 644 | |
| 645 | va_start(ap,arg); |
| 646 | c=fork(); |
| 647 | if (c) { |
| 648 | /* Parent -> wait for child */ |
| 649 | waitpid(c,&rv,0); |
| 650 | } else if (c==0) { |
| 651 | char *args[100]; |
| 652 | int i; |
| 653 | /* Child -> exec command */ |
| 654 | args[0]=arg; |
| 655 | i=1; |
| 656 | while ((args[i++]=va_arg(ap,char *))); |
| 657 | execvp(path,args); |
| 658 | exit(1); |
| 659 | } else { |
| 660 | /* Error */ |
| 661 | fatal_perror("sys_cmd(%s,%s,...)"); |
| 662 | } |
| 663 | |
| 664 | va_end(ap); |
| 665 | return rv; |
| 666 | } |
| 667 | |
| 668 | static char *phases[NR_PHASES]={ |
| 669 | "PHASE_INIT", |
| 670 | "PHASE_GETOPTS", |
| 671 | "PHASE_READCONFIG", |
| 672 | "PHASE_SETUP", |
| 673 | "PHASE_GETRESOURCES", |
| 674 | "PHASE_DROPPRIV", |
| 675 | "PHASE_RUN", |
| 676 | "PHASE_SHUTDOWN" |
| 677 | }; |
| 678 | |
| 679 | void enter_phase(uint32_t new_phase) |
| 680 | { |
| 681 | struct phase_hook *i; |
| 682 | |
| 683 | if (hooks[new_phase]) |
| 684 | Message(M_DEBUG_PHASE,"Running hooks for %s...\n", phases[new_phase]); |
| 685 | current_phase=new_phase; |
| 686 | |
| 687 | for (i=hooks[new_phase]; i; i=i->next) |
| 688 | i->fn(i->state, new_phase); |
| 689 | Message(M_DEBUG_PHASE,"Now in %s\n",phases[new_phase]); |
| 690 | } |
| 691 | |
| 692 | bool_t add_hook(uint32_t phase, hook_fn *fn, void *state) |
| 693 | { |
| 694 | struct phase_hook *h; |
| 695 | |
| 696 | h=safe_malloc(sizeof(*h),"add_hook"); |
| 697 | h->fn=fn; |
| 698 | h->state=state; |
| 699 | h->next=hooks[phase]; |
| 700 | hooks[phase]=h; |
| 701 | return True; |
| 702 | } |
| 703 | |
| 704 | bool_t remove_hook(uint32_t phase, hook_fn *fn, void *state) |
| 705 | { |
| 706 | fatal("remove_hook: not implemented\n"); |
| 707 | |
| 708 | return False; |
| 709 | } |
| 710 | |
| 711 | void log(struct log_if *lf, int priority, char *message, ...) |
| 712 | { |
| 713 | va_list ap; |
| 714 | |
| 715 | va_start(ap,message); |
| 716 | lf->vlog(lf->st,priority,message,ap); |
| 717 | va_end(ap); |
| 718 | } |
| 719 | |
| 720 | struct buffer { |
| 721 | closure_t cl; |
| 722 | struct buffer_if ops; |
| 723 | }; |
| 724 | |
| 725 | void buffer_assert_free(struct buffer_if *buffer, string_t file, uint32_t line) |
| 726 | { |
| 727 | if (!buffer->free) { |
| 728 | fatal("BUF_ASSERT_FREE, %s line %d, owned by %s\n", |
| 729 | file,line,buffer->owner); |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | void buffer_assert_used(struct buffer_if *buffer, string_t file, uint32_t line) |
| 734 | { |
| 735 | if (buffer->free) { |
| 736 | fatal("BUF_ASSERT_USED, %s line %d, last owned by %s\n", |
| 737 | file,line,buffer->owner); |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | void buffer_init(struct buffer_if *buffer, uint32_t max_start_pad) |
| 742 | { |
| 743 | buffer->start=buffer->base+max_start_pad; |
| 744 | buffer->size=0; |
| 745 | } |
| 746 | |
| 747 | void *buf_append(struct buffer_if *buf, uint32_t amount) { |
| 748 | void *p; |
| 749 | p=buf->start + buf->size; |
| 750 | buf->size+=amount; |
| 751 | return p; |
| 752 | } |
| 753 | |
| 754 | void *buf_prepend(struct buffer_if *buf, uint32_t amount) { |
| 755 | buf->size+=amount; |
| 756 | return buf->start-=amount; |
| 757 | } |
| 758 | |
| 759 | void *buf_unappend(struct buffer_if *buf, uint32_t amount) { |
| 760 | if (buf->size < amount) return 0; |
| 761 | return buf->start+(buf->size-=amount); |
| 762 | } |
| 763 | |
| 764 | void *buf_unprepend(struct buffer_if *buf, uint32_t amount) { |
| 765 | void *p; |
| 766 | p=buf->start; |
| 767 | buf->start+=amount; |
| 768 | buf->size-=amount; |
| 769 | return p; |
| 770 | } |
| 771 | |
| 772 | /* Append a two-byte length and the string to the buffer. Length is in |
| 773 | network byte order. */ |
| 774 | void buf_append_string(struct buffer_if *buf, string_t s) |
| 775 | { |
| 776 | uint16_t len; |
| 777 | |
| 778 | len=strlen(s); |
| 779 | buf_append_uint16(buf,len); |
| 780 | memcpy(buf_append(buf,len),s,len); |
| 781 | } |
| 782 | |
| 783 | void buffer_new(struct buffer_if *buf, uint32_t len) |
| 784 | { |
| 785 | buf->free=True; |
| 786 | buf->owner=NULL; |
| 787 | buf->flags=0; |
| 788 | buf->loc.file=NULL; |
| 789 | buf->loc.line=0; |
| 790 | buf->size=0; |
| 791 | buf->len=len; |
| 792 | buf->start=NULL; |
| 793 | buf->base=safe_malloc(len,"buffer_new"); |
| 794 | } |
| 795 | |
| 796 | static list_t *buffer_apply(closure_t *self, struct cloc loc, dict_t *context, |
| 797 | list_t *args) |
| 798 | { |
| 799 | struct buffer *st; |
| 800 | item_t *item; |
| 801 | dict_t *dict; |
| 802 | bool_t lockdown=False; |
| 803 | uint32_t len=DEFAULT_BUFFER_SIZE; |
| 804 | |
| 805 | st=safe_malloc(sizeof(*st),"buffer_apply"); |
| 806 | st->cl.description="buffer"; |
| 807 | st->cl.type=CL_BUFFER; |
| 808 | st->cl.apply=NULL; |
| 809 | st->cl.interface=&st->ops; |
| 810 | |
| 811 | /* First argument, if present, is buffer length */ |
| 812 | item=list_elem(args,0); |
| 813 | if (item) { |
| 814 | if (item->type!=t_number) { |
| 815 | cfgfatal(st->ops.loc,"buffer","first parameter must be a " |
| 816 | "number (buffer size)\n"); |
| 817 | } |
| 818 | len=item->data.number; |
| 819 | if (len<MIN_BUFFER_SIZE) { |
| 820 | cfgfatal(st->ops.loc,"buffer","ludicrously small buffer size\n"); |
| 821 | } |
| 822 | if (len>MAX_BUFFER_SIZE) { |
| 823 | cfgfatal(st->ops.loc,"buffer","ludicrously large buffer size\n"); |
| 824 | } |
| 825 | } |
| 826 | /* Second argument, if present, is a dictionary */ |
| 827 | item=list_elem(args,1); |
| 828 | if (item) { |
| 829 | if (item->type!=t_dict) { |
| 830 | cfgfatal(st->ops.loc,"buffer","second parameter must be a " |
| 831 | "dictionary\n"); |
| 832 | } |
| 833 | dict=item->data.dict; |
| 834 | lockdown=dict_read_bool(dict,"lockdown",False,"buffer",st->ops.loc, |
| 835 | False); |
| 836 | } |
| 837 | |
| 838 | buffer_new(&st->ops,len); |
| 839 | if (lockdown) { |
| 840 | /* XXX mlock the buffer if possible */ |
| 841 | } |
| 842 | |
| 843 | return new_closure(&st->cl); |
| 844 | } |
| 845 | |
| 846 | init_module util_module; |
| 847 | void util_module(dict_t *dict) |
| 848 | { |
| 849 | add_closure(dict,"logfile",logfile_apply); |
| 850 | add_closure(dict,"syslog",syslog_apply); |
| 851 | add_closure(dict,"sysbuffer",buffer_apply); |
| 852 | } |