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-rw-r--r--isisd/isis_misc.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/isisd/isis_misc.c b/isisd/isis_misc.c
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+/*
+ * IS-IS Rout(e)ing protocol - isis_misc.h
+ * Miscellanous routines
+ *
+ * Copyright (C) 2001,2002 Sampo Saaristo
+ * Tampere University of Technology
+ * Institute of Communications Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public Licenseas published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <ctype.h>
+#include <zebra.h>
+#include <net/ethernet.h>
+
+
+#include "stream.h"
+#include "vty.h"
+#include "hash.h"
+#include "if.h"
+
+#include "isisd/dict.h"
+#include "isisd/isis_constants.h"
+#include "isisd/isis_common.h"
+#include "isisd/isis_circuit.h"
+#include "isisd/isisd.h"
+#include "isisd/isis_misc.h"
+
+#include "isisd/isis_tlv.h"
+#include "isisd/isis_lsp.h"
+#include "isisd/isis_constants.h"
+#include "isisd/isis_adjacency.h"
+
+/*
+ * This converts the isonet to its printable format
+ */
+char * isonet_print (u_char *from, int len) {
+ int i = 0;
+ char *pos = isonet;
+
+ if(!from)
+ return "unknown";
+
+ while (i < len) {
+ if (i & 1) {
+ sprintf ( pos, "%02x", *(from + i));
+ pos += 2;
+ } else {
+ if (i == 0) { /* if the area addr is just one byte, eg. 47. */
+ sprintf ( pos, "%02x", *(from + i));
+ pos += 2;
+ } else {
+ sprintf ( pos, "%02x.", *(from + i));
+ pos += 3;
+ }
+ }
+ i++;
+ }
+ *(pos) = '\0';
+ return isonet;
+}
+
+/*
+ * Returns 0 on error, length of buff on ok
+ * extract dot from the dotted str, and insert all the number in a buff
+ */
+int
+dotformat2buff (u_char *buff, u_char *dotted)
+{
+ int dotlen, len = 0;
+ u_char *pos = dotted;
+ u_char number[3];
+ int nextdotpos = 2;
+
+ number[2] = '\0';
+ dotlen = strlen(dotted);
+ if (dotlen > 50) {
+ /* this can't be an iso net, its too long */
+ return 0;
+ }
+
+ while ( (pos - dotted) < dotlen && len < 20 ) {
+ if (*pos == '.') {
+ /* we expect the . at 2, and than every 5 */
+ if ((pos - dotted) != nextdotpos) {
+ len = 0;
+ break;
+ }
+ nextdotpos += 5;
+ pos++;
+ continue;
+ }
+ /* we must have at least two chars left here */
+ if (dotlen - (pos - dotted) < 2) {
+ len = 0;
+ break;
+ }
+
+ if ((isxdigit((int)*pos)) && (isxdigit((int)*(pos+1)))){
+ memcpy (number, pos ,2);
+ pos+=2;
+ } else {
+ len = 0;
+ break;
+ }
+
+ *(buff + len) = (char)strtol(number, NULL, 16);
+ len++;
+ }
+
+ return len;
+}
+/*
+ * conversion of XXXX.XXXX.XXXX to memory
+ */
+int
+sysid2buff (u_char *buff, u_char *dotted)
+ {
+ int len = 0;
+ u_char *pos = dotted;
+ u_char number[3];
+
+ number[2] = '\0';
+ // surely not a sysid_string if not 14 length
+ if (strlen(dotted) != 14) {
+ return 0;
+ }
+
+ while ( len < ISIS_SYS_ID_LEN ) {
+ if (*pos == '.') {
+ /* the . is not positioned correctly */
+ if (((pos - dotted) !=4) && ((pos - dotted) != 9)) {
+ len = 0;
+ break;
+ }
+ pos++;
+ continue;
+ }
+ if ((isxdigit((int)*pos)) && (isxdigit((int)*(pos+1)))){
+ memcpy (number, pos ,2);
+ pos+=2;
+ } else {
+ len = 0;
+ break;
+ }
+
+ *(buff + len) = (char)strtol(number, NULL, 16);
+ len++;
+ }
+
+ return len;
+
+}
+
+/*
+ * converts the nlpids struct (filled by TLV #129)
+ * into a string
+ */
+
+char *
+nlpid2string (struct nlpids *nlpids) {
+ char *pos = nlpidstring;
+ int i;
+
+ for (i=0;i<nlpids->count;i++) {
+ switch (nlpids->nlpids[i]) {
+ case NLPID_IP:
+ pos += sprintf (pos, "IPv4");
+ break;
+ case NLPID_IPV6:
+ pos += sprintf (pos, "IPv6");
+ break;
+ default:
+ pos += sprintf (pos, "unknown");
+ break;
+ }
+ if (nlpids->count-i>1)
+ pos += sprintf (pos, ", ");
+
+ }
+
+ *(pos) = '\0';
+
+ return nlpidstring;
+}
+
+/*
+ * supports the given af ?
+ */
+int
+speaks (struct nlpids *nlpids, int family)
+{
+ int i, speaks = 0;
+
+ if (nlpids == (struct nlpids*)NULL)
+ return speaks;
+ for (i = 0;i < nlpids->count; i++) {
+ if (family == AF_INET && nlpids->nlpids[i] == NLPID_IP)
+ speaks = 1;
+ if (family == AF_INET6 && nlpids->nlpids[i] == NLPID_IPV6)
+ speaks = 1;
+ }
+
+ return speaks;
+}
+
+
+/*
+ * Returns 0 on error, IS-IS Circuit Type on ok
+ */
+int
+string2circuit_t (u_char *str)
+{
+
+ if (!str)
+ return 0;
+
+ if (!strcmp(str,"level-1"))
+ return IS_LEVEL_1;
+
+ if (!strcmp(str,"level-2-only") || !strcmp(str,"level-2"))
+ return IS_LEVEL_2;
+
+ if (!strcmp(str,"level-1-2"))
+ return IS_LEVEL_1_AND_2;
+
+ return 0;
+}
+
+const char *
+circuit_t2string (int circuit_t)
+{
+ switch (circuit_t) {
+ case IS_LEVEL_1:
+ return "L1";
+ case IS_LEVEL_2:
+ return "L2";
+ case IS_LEVEL_1_AND_2:
+ return "L1L2";
+ default:
+ return "??";
+ }
+
+ return NULL; /* not reached */
+}
+
+const char *
+syst2string (int type)
+{
+ switch (type) {
+ case ISIS_SYSTYPE_ES:
+ return "ES";
+ case ISIS_SYSTYPE_IS:
+ return "IS";
+ case ISIS_SYSTYPE_L1_IS:
+ return "1";
+ case ISIS_SYSTYPE_L2_IS:
+ return "2";
+ default:
+ return "??";
+ }
+
+ return NULL; /* not reached */
+}
+
+/*
+ * Print functions - we print to static vars
+ */
+char *
+snpa_print (u_char *from)
+{
+ int i = 0;
+ u_char *pos = snpa;
+
+ if(!from)
+ return "unknown";
+
+ while (i < ETH_ALEN - 1) {
+ if (i & 1) {
+ sprintf ( pos, "%02x.", *(from + i));
+ pos += 3;
+ } else {
+ sprintf ( pos, "%02x", *(from + i));
+ pos += 2;
+
+ }
+ i++;
+ }
+
+ sprintf (pos, "%02x", *(from + (ISIS_SYS_ID_LEN - 1)));
+ pos += 2;
+ *(pos) = '\0';
+
+ return snpa;
+}
+
+char *
+sysid_print (u_char *from)
+{
+ int i = 0;
+ char *pos = sysid;
+
+ if(!from)
+ return "unknown";
+
+ while (i < ISIS_SYS_ID_LEN - 1) {
+ if (i & 1) {
+ sprintf ( pos, "%02x.", *(from + i));
+ pos += 3;
+ } else {
+ sprintf ( pos, "%02x", *(from + i));
+ pos += 2;
+
+ }
+ i++;
+ }
+
+ sprintf (pos, "%02x", *(from + (ISIS_SYS_ID_LEN - 1)));
+ pos += 2;
+ *(pos) = '\0';
+
+ return sysid;
+}
+
+char *
+rawlspid_print (u_char *from)
+{
+ char *pos = lspid;
+ if(!from)
+ return "unknown";
+ memcpy(pos, sysid_print(from), 15);
+ pos += 14;
+ sprintf (pos, ".%02x", LSP_PSEUDO_ID(from));
+ pos += 3;
+ sprintf (pos, "-%02x", LSP_FRAGMENT(from));
+ pos += 3;
+
+ *(pos) = '\0';
+
+ return lspid;
+}
+
+char *
+time2string (u_int32_t time) {
+ char *pos = datestring;
+ u_int32_t rest;
+
+ if (time==0)
+ return "-";
+
+ if(time/SECS_PER_YEAR)
+ pos += sprintf (pos, "%uY",time/SECS_PER_YEAR);
+ rest=time%SECS_PER_YEAR;
+ if(rest/SECS_PER_MONTH)
+ pos += sprintf (pos, "%uM",rest/SECS_PER_MONTH);
+ rest=rest%SECS_PER_MONTH;
+ if(rest/SECS_PER_WEEK)
+ pos += sprintf (pos, "%uw",rest/SECS_PER_WEEK);
+ rest=rest%SECS_PER_WEEK;
+ if(rest/SECS_PER_DAY)
+ pos += sprintf (pos, "%ud",rest/SECS_PER_DAY);
+ rest=rest%SECS_PER_DAY;
+ if(rest/SECS_PER_HOUR)
+ pos += sprintf (pos, "%uh",rest/SECS_PER_HOUR);
+ rest=rest%SECS_PER_HOUR;
+ if(rest/SECS_PER_MINUTE)
+ pos += sprintf (pos, "%um",rest/SECS_PER_MINUTE);
+ rest=rest%SECS_PER_MINUTE;
+ if(rest)
+ pos += sprintf (pos, "%us",rest);
+
+ *(pos) = 0;
+
+ return datestring;
+}
+
+/*
+ * routine to decrement a timer by a random
+ * number
+ *
+ * first argument is the timer and the second is
+ * the jitter
+ */
+unsigned long
+isis_jitter (unsigned long timer, unsigned long jitter)
+{
+ int j,k;
+
+ if (jitter>=100)
+ return timer;
+
+ if (timer == 1)
+ return timer;
+ /*
+ * randomizing just the percent value provides
+ * no good random numbers - hence the spread
+ * to RANDOM_SPREAD (100000), which is ok as
+ * most IS-IS timers are no longer than 16 bit
+ */
+
+ j = 1 + (int) ((RANDOM_SPREAD * rand()) / (RAND_MAX + 1.0 ));
+
+ k = timer - (timer * (100 - jitter))/100;
+
+ timer = timer - (k * j / RANDOM_SPREAD);
+
+ return timer;
+}
+
+struct in_addr
+newprefix2inaddr (u_char *prefix_start, u_char prefix_masklen)
+{
+ memset(&new_prefix, 0, sizeof (new_prefix));
+ memcpy(&new_prefix, prefix_start, (prefix_masklen & 0x3F) ?
+ ((((prefix_masklen & 0x3F)-1)>>3)+1) : 0);
+ return new_prefix;
+}
+
+
+
+
+
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