Annotation of embedaddon/quagga/isisd/isis_misc.c, revision 1.1
1.1 ! misho 1: /*
! 2: * IS-IS Rout(e)ing protocol - isis_misc.h
! 3: * Miscellanous routines
! 4: *
! 5: * Copyright (C) 2001,2002 Sampo Saaristo
! 6: * Tampere University of Technology
! 7: * Institute of Communications Engineering
! 8: *
! 9: * This program is free software; you can redistribute it and/or modify it
! 10: * under the terms of the GNU General Public Licenseas published by the Free
! 11: * Software Foundation; either version 2 of the License, or (at your option)
! 12: * any later version.
! 13: *
! 14: * This program is distributed in the hope that it will be useful,but WITHOUT
! 15: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
! 16: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
! 17: * more details.
! 18:
! 19: * You should have received a copy of the GNU General Public License along
! 20: * with this program; if not, write to the Free Software Foundation, Inc.,
! 21: * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
! 22: */
! 23:
! 24: #include <zebra.h>
! 25:
! 26: #include "stream.h"
! 27: #include "vty.h"
! 28: #include "hash.h"
! 29: #include "if.h"
! 30: #include "command.h"
! 31:
! 32: #include "isisd/dict.h"
! 33: #include "isisd/isis_constants.h"
! 34: #include "isisd/isis_common.h"
! 35: #include "isisd/isis_circuit.h"
! 36: #include "isisd/isisd.h"
! 37: #include "isisd/isis_misc.h"
! 38:
! 39: #include "isisd/isis_tlv.h"
! 40: #include "isisd/isis_lsp.h"
! 41: #include "isisd/isis_constants.h"
! 42: #include "isisd/isis_adjacency.h"
! 43:
! 44: /* staticly assigned vars for printing purposes */
! 45: struct in_addr new_prefix;
! 46: /* len of xxxx.xxxx.xxxx + place for #0 termination */
! 47: char sysid[15];
! 48: /* len of xxxx.xxxx.xxxx + place for #0 termination */
! 49: char snpa[15];
! 50: /* len of xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx */
! 51: char isonet[51];
! 52: /* + place for #0 termination */
! 53: /* len of xxxx.xxxx.xxxx.xx.xx + place for #0 termination */
! 54: char lspid[21];
! 55: /* len of xxYxxMxWxdxxhxxmxxs + place for #0 termination */
! 56: char datestring[20];
! 57: char nlpidstring[30];
! 58:
! 59: /*
! 60: * This converts the isonet to its printable format
! 61: */
! 62: const char *
! 63: isonet_print (u_char * from, int len)
! 64: {
! 65: int i = 0;
! 66: char *pos = isonet;
! 67:
! 68: if (!from)
! 69: return "unknown";
! 70:
! 71: while (i < len)
! 72: {
! 73: if (i & 1)
! 74: {
! 75: sprintf (pos, "%02x", *(from + i));
! 76: pos += 2;
! 77: }
! 78: else
! 79: {
! 80: if (i == (len - 1))
! 81: { /* No dot at the end of address */
! 82: sprintf (pos, "%02x", *(from + i));
! 83: pos += 2;
! 84: }
! 85: else
! 86: {
! 87: sprintf (pos, "%02x.", *(from + i));
! 88: pos += 3;
! 89: }
! 90: }
! 91: i++;
! 92: }
! 93: *(pos) = '\0';
! 94: return isonet;
! 95: }
! 96:
! 97: /*
! 98: * Returns 0 on error, length of buff on ok
! 99: * extract dot from the dotted str, and insert all the number in a buff
! 100: */
! 101: int
! 102: dotformat2buff (u_char * buff, const u_char * dotted)
! 103: {
! 104: int dotlen, len = 0;
! 105: const u_char *pos = dotted;
! 106: u_char number[3];
! 107: int nextdotpos = 2;
! 108:
! 109: number[2] = '\0';
! 110: dotlen = strlen(dotted);
! 111: if (dotlen > 50)
! 112: {
! 113: /* this can't be an iso net, its too long */
! 114: return 0;
! 115: }
! 116:
! 117: while ((pos - dotted) < dotlen && len < 20)
! 118: {
! 119: if (*pos == '.')
! 120: {
! 121: /* we expect the . at 2, and than every 5 */
! 122: if ((pos - dotted) != nextdotpos)
! 123: {
! 124: len = 0;
! 125: break;
! 126: }
! 127: nextdotpos += 5;
! 128: pos++;
! 129: continue;
! 130: }
! 131: /* we must have at least two chars left here */
! 132: if (dotlen - (pos - dotted) < 2)
! 133: {
! 134: len = 0;
! 135: break;
! 136: }
! 137:
! 138: if ((isxdigit ((int) *pos)) && (isxdigit ((int) *(pos + 1))))
! 139: {
! 140: memcpy (number, pos, 2);
! 141: pos += 2;
! 142: }
! 143: else
! 144: {
! 145: len = 0;
! 146: break;
! 147: }
! 148:
! 149: *(buff + len) = (char) strtol ((char *)number, NULL, 16);
! 150: len++;
! 151: }
! 152:
! 153: return len;
! 154: }
! 155:
! 156: /*
! 157: * conversion of XXXX.XXXX.XXXX to memory
! 158: */
! 159: int
! 160: sysid2buff (u_char * buff, const u_char * dotted)
! 161: {
! 162: int len = 0;
! 163: const u_char *pos = dotted;
! 164: u_char number[3];
! 165:
! 166: number[2] = '\0';
! 167: // surely not a sysid_string if not 14 length
! 168: if (strlen (dotted) != 14)
! 169: {
! 170: return 0;
! 171: }
! 172:
! 173: while (len < ISIS_SYS_ID_LEN)
! 174: {
! 175: if (*pos == '.')
! 176: {
! 177: /* the . is not positioned correctly */
! 178: if (((pos - dotted) != 4) && ((pos - dotted) != 9))
! 179: {
! 180: len = 0;
! 181: break;
! 182: }
! 183: pos++;
! 184: continue;
! 185: }
! 186: if ((isxdigit ((int) *pos)) && (isxdigit ((int) *(pos + 1))))
! 187: {
! 188: memcpy (number, pos, 2);
! 189: pos += 2;
! 190: }
! 191: else
! 192: {
! 193: len = 0;
! 194: break;
! 195: }
! 196:
! 197: *(buff + len) = (char) strtol ((char *)number, NULL, 16);
! 198: len++;
! 199: }
! 200:
! 201: return len;
! 202:
! 203: }
! 204:
! 205: /*
! 206: * converts the nlpids struct (filled by TLV #129)
! 207: * into a string
! 208: */
! 209:
! 210: char *
! 211: nlpid2string (struct nlpids *nlpids)
! 212: {
! 213: char *pos = nlpidstring;
! 214: int i;
! 215:
! 216: for (i = 0; i < nlpids->count; i++)
! 217: {
! 218: switch (nlpids->nlpids[i])
! 219: {
! 220: case NLPID_IP:
! 221: pos += sprintf (pos, "IPv4");
! 222: break;
! 223: case NLPID_IPV6:
! 224: pos += sprintf (pos, "IPv6");
! 225: break;
! 226: case NLPID_SNAP:
! 227: pos += sprintf (pos, "SNAP");
! 228: break;
! 229: case NLPID_CLNP:
! 230: pos += sprintf (pos, "CLNP");
! 231: break;
! 232: case NLPID_ESIS:
! 233: pos += sprintf (pos, "ES-IS");
! 234: break;
! 235: default:
! 236: pos += sprintf (pos, "unknown");
! 237: break;
! 238: }
! 239: if (nlpids->count - i > 1)
! 240: pos += sprintf (pos, ", ");
! 241:
! 242: }
! 243:
! 244: *(pos) = '\0';
! 245:
! 246: return nlpidstring;
! 247: }
! 248:
! 249: /*
! 250: * supports the given af ?
! 251: */
! 252: int
! 253: speaks (struct nlpids *nlpids, int family)
! 254: {
! 255: int i, speaks = 0;
! 256:
! 257: if (nlpids == (struct nlpids *) NULL)
! 258: return speaks;
! 259: for (i = 0; i < nlpids->count; i++)
! 260: {
! 261: if (family == AF_INET && nlpids->nlpids[i] == NLPID_IP)
! 262: speaks = 1;
! 263: if (family == AF_INET6 && nlpids->nlpids[i] == NLPID_IPV6)
! 264: speaks = 1;
! 265: }
! 266:
! 267: return speaks;
! 268: }
! 269:
! 270: /*
! 271: * Returns 0 on error, IS-IS Circuit Type on ok
! 272: */
! 273: int
! 274: string2circuit_t (const u_char * str)
! 275: {
! 276:
! 277: if (!str)
! 278: return 0;
! 279:
! 280: if (!strcmp (str, "level-1"))
! 281: return IS_LEVEL_1;
! 282:
! 283: if (!strcmp (str, "level-2-only") || !strcmp (str, "level-2"))
! 284: return IS_LEVEL_2;
! 285:
! 286: if (!strcmp (str, "level-1-2"))
! 287: return IS_LEVEL_1_AND_2;
! 288:
! 289: return 0;
! 290: }
! 291:
! 292: const char *
! 293: circuit_t2string (int circuit_t)
! 294: {
! 295: switch (circuit_t)
! 296: {
! 297: case IS_LEVEL_1:
! 298: return "L1";
! 299: case IS_LEVEL_2:
! 300: return "L2";
! 301: case IS_LEVEL_1_AND_2:
! 302: return "L1L2";
! 303: default:
! 304: return "??";
! 305: }
! 306:
! 307: return NULL; /* not reached */
! 308: }
! 309:
! 310: const char *
! 311: syst2string (int type)
! 312: {
! 313: switch (type)
! 314: {
! 315: case ISIS_SYSTYPE_ES:
! 316: return "ES";
! 317: case ISIS_SYSTYPE_IS:
! 318: return "IS";
! 319: case ISIS_SYSTYPE_L1_IS:
! 320: return "1";
! 321: case ISIS_SYSTYPE_L2_IS:
! 322: return "2";
! 323: default:
! 324: return "??";
! 325: }
! 326:
! 327: return NULL; /* not reached */
! 328: }
! 329:
! 330: /*
! 331: * Print functions - we print to static vars
! 332: */
! 333: const char *
! 334: snpa_print (u_char * from)
! 335: {
! 336: int i = 0;
! 337: u_char *pos = (u_char *)snpa;
! 338:
! 339: if (!from)
! 340: return "unknown";
! 341:
! 342: while (i < ETH_ALEN - 1)
! 343: {
! 344: if (i & 1)
! 345: {
! 346: sprintf ((char *)pos, "%02x.", *(from + i));
! 347: pos += 3;
! 348: }
! 349: else
! 350: {
! 351: sprintf ((char *)pos, "%02x", *(from + i));
! 352: pos += 2;
! 353:
! 354: }
! 355: i++;
! 356: }
! 357:
! 358: sprintf ((char *)pos, "%02x", *(from + (ISIS_SYS_ID_LEN - 1)));
! 359: pos += 2;
! 360: *(pos) = '\0';
! 361:
! 362: return snpa;
! 363: }
! 364:
! 365: const char *
! 366: sysid_print (u_char * from)
! 367: {
! 368: int i = 0;
! 369: char *pos = sysid;
! 370:
! 371: if (!from)
! 372: return "unknown";
! 373:
! 374: while (i < ISIS_SYS_ID_LEN - 1)
! 375: {
! 376: if (i & 1)
! 377: {
! 378: sprintf (pos, "%02x.", *(from + i));
! 379: pos += 3;
! 380: }
! 381: else
! 382: {
! 383: sprintf (pos, "%02x", *(from + i));
! 384: pos += 2;
! 385:
! 386: }
! 387: i++;
! 388: }
! 389:
! 390: sprintf (pos, "%02x", *(from + (ISIS_SYS_ID_LEN - 1)));
! 391: pos += 2;
! 392: *(pos) = '\0';
! 393:
! 394: return sysid;
! 395: }
! 396:
! 397: const char *
! 398: rawlspid_print (u_char * from)
! 399: {
! 400: char *pos = lspid;
! 401: if (!from)
! 402: return "unknown";
! 403: memcpy (pos, sysid_print (from), 15);
! 404: pos += 14;
! 405: sprintf (pos, ".%02x", LSP_PSEUDO_ID (from));
! 406: pos += 3;
! 407: sprintf (pos, "-%02x", LSP_FRAGMENT (from));
! 408: pos += 3;
! 409:
! 410: *(pos) = '\0';
! 411:
! 412: return lspid;
! 413: }
! 414:
! 415: const char *
! 416: time2string (u_int32_t time)
! 417: {
! 418: char *pos = datestring;
! 419: u_int32_t rest;
! 420:
! 421: if (time == 0)
! 422: return "-";
! 423:
! 424: if (time / SECS_PER_YEAR)
! 425: pos += sprintf (pos, "%uY", time / SECS_PER_YEAR);
! 426: rest = time % SECS_PER_YEAR;
! 427: if (rest / SECS_PER_MONTH)
! 428: pos += sprintf (pos, "%uM", rest / SECS_PER_MONTH);
! 429: rest = rest % SECS_PER_MONTH;
! 430: if (rest / SECS_PER_WEEK)
! 431: pos += sprintf (pos, "%uw", rest / SECS_PER_WEEK);
! 432: rest = rest % SECS_PER_WEEK;
! 433: if (rest / SECS_PER_DAY)
! 434: pos += sprintf (pos, "%ud", rest / SECS_PER_DAY);
! 435: rest = rest % SECS_PER_DAY;
! 436: if (rest / SECS_PER_HOUR)
! 437: pos += sprintf (pos, "%uh", rest / SECS_PER_HOUR);
! 438: rest = rest % SECS_PER_HOUR;
! 439: if (rest / SECS_PER_MINUTE)
! 440: pos += sprintf (pos, "%um", rest / SECS_PER_MINUTE);
! 441: rest = rest % SECS_PER_MINUTE;
! 442: if (rest)
! 443: pos += sprintf (pos, "%us", rest);
! 444:
! 445: *(pos) = 0;
! 446:
! 447: return datestring;
! 448: }
! 449:
! 450: /*
! 451: * routine to decrement a timer by a random
! 452: * number
! 453: *
! 454: * first argument is the timer and the second is
! 455: * the jitter
! 456: */
! 457: unsigned long
! 458: isis_jitter (unsigned long timer, unsigned long jitter)
! 459: {
! 460: int j, k;
! 461:
! 462: if (jitter >= 100)
! 463: return timer;
! 464:
! 465: if (timer == 1)
! 466: return timer;
! 467: /*
! 468: * randomizing just the percent value provides
! 469: * no good random numbers - hence the spread
! 470: * to RANDOM_SPREAD (100000), which is ok as
! 471: * most IS-IS timers are no longer than 16 bit
! 472: */
! 473:
! 474: j = 1 + (int) ((RANDOM_SPREAD * rand ()) / (RAND_MAX + 1.0));
! 475:
! 476: k = timer - (timer * (100 - jitter)) / 100;
! 477:
! 478: timer = timer - (k * j / RANDOM_SPREAD);
! 479:
! 480: return timer;
! 481: }
! 482:
! 483: struct in_addr
! 484: newprefix2inaddr (u_char * prefix_start, u_char prefix_masklen)
! 485: {
! 486: memset (&new_prefix, 0, sizeof (new_prefix));
! 487: memcpy (&new_prefix, prefix_start, (prefix_masklen & 0x3F) ?
! 488: ((((prefix_masklen & 0x3F) - 1) >> 3) + 1) : 0);
! 489: return new_prefix;
! 490: }
! 491:
! 492: /*
! 493: * Returns host.name if any, otherwise
! 494: * it returns the system hostname.
! 495: */
! 496: const char *
! 497: unix_hostname (void)
! 498: {
! 499: static struct utsname names;
! 500: const char *hostname;
! 501: extern struct host host;
! 502:
! 503: hostname = host.name;
! 504: if (!hostname)
! 505: {
! 506: uname (&names);
! 507: hostname = names.nodename;
! 508: }
! 509:
! 510: return hostname;
! 511: }
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