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/*
* Project : ipv6calc
* File : librfc1884.c
* Version : $Id: e6cc6ce21ba466296307efb0363acdbabe070d62 $
* Copyright : 2001-2016 by Peter Bieringer <pb (at) bieringer.de>
*
* Information:
* Function library for conversions defined in RFC 1884
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "libipv6calcdebug.h"
#include "libipv6addr.h"
#include "libipv6calc.h"
#include "librfc1884.h"
#include "ipv6calctypes.h"
/*
* function decompress a given IPv6 address (reverse RFC 1884)
*
* in : *addrstring = IPv6 address
* out: *resultstring = result
* ret: ==0: ok, !=0: error
*
* Based on code in from 'ircd'
*/
int compaddr_to_uncompaddr(const char *addrstring, char *resultstring, const size_t resultstring_length) {
int retval = 1, cnt;
char *cp, *op, *strp;
char tempstring[NI_MAXHOST];
DEBUGPRINT_WA(DEBUG_librfc1884, "got input: %s", addrstring);
snprintf(tempstring, sizeof(tempstring), "%s", addrstring);
strp = strstr(tempstring, "::");
if (strp) {
DEBUGPRINT_NA(DEBUG_librfc1884, "found '::' in IPv6 address");
/* check for additional "::" occurance - not allowed! */
if (strstr(strp+1, "::")) {
snprintf(resultstring, resultstring_length, "%s", "More than 1 block of 2 colons in address is not allowed!");
retval = 1;
return (retval);
};
cnt = 0;
cp = tempstring;
op = resultstring;
while (*cp != '\0') {
if (*cp == ':') cnt += 1;
if (*cp++ == '.') {
cnt += 1;
break;
};
};
cp = tempstring;
while (*cp != '\0') {
*op++ = *cp++;
if (*(cp-1) == ':' && *cp == ':') {
DEBUGPRINT_WA(DEBUG_librfc1884, "cnt: %d", cnt);
if ((cp-1) == tempstring) {
DEBUGPRINT_WA(DEBUG_librfc1884, "fill one '0:' (%d)", cnt);
op--;
*op++ = '0';
*op++ = ':';
};
if (cnt < 8) {
DEBUGPRINT_WA(DEBUG_librfc1884, "fill one '0:' (%d)", cnt);
*op++ = '0';
} else if (cnt == 8) {
DEBUGPRINT_WA(DEBUG_librfc1884, "replace ':' by '0' (%d)", cnt);
op--;
};
while (cnt++ < 7) {
DEBUGPRINT_WA(DEBUG_librfc1884, "fill one ':0' (%d)", cnt);
*op++ = ':';
*op++ = '0';
};
};
};
if (*(op-1)==':') *op++ = '0';
*op = '\0';
DEBUGPRINT_WA(DEBUG_librfc1884, "result: %s", resultstring);
} else {
snprintf(resultstring, resultstring_length, "%s", addrstring);
DEBUGPRINT_NA(DEBUG_librfc1884, "address is not in compressed format");
};
retval = 0;
return (retval);
};
/*
* function IPv6addrstruct to compressed format (RFC 1884)
*
* compress the biggest '0' block, leading has precedence
*
* in : *addrstring = IPv6 address
* out: *resultstring = result
* ret: ==0: ok, !=0: error
*/
int ipv6addrstruct_to_compaddr(const ipv6calc_ipv6addr *ipv6addrp, char *resultstring, const size_t resultstring_length) {
int retval = -1;
uint32_t formatoptions = FORMATOPTION_printlowercase;
/* old style compatibility */
retval = librfc1884_ipv6addrstruct_to_compaddr(ipv6addrp, resultstring, resultstring_length, formatoptions);
return (retval);
};
int librfc1884_ipv6addrstruct_to_compaddr(const ipv6calc_ipv6addr *ipv6addrp, char *resultstring, const size_t resultstring_length, const uint32_t formatoptions) {
char tempstring[NI_MAXHOST], temp2string[NI_MAXHOST];
int retval = 1;
int zstart = -1, zend = -1, tstart = -1, tend = -1, i, w_max = 7;
unsigned int s;
DEBUGPRINT_WA(DEBUG_librfc1884, "typeinfo of IPv6 address: %08x", (unsigned int) ipv6addrp->typeinfo);
if ( (ipv6addrp->typeinfo & IPV6_ADDR_COMPATv4) != 0 ) {
/* compatv4 address */
DEBUGPRINT_NA(DEBUG_librfc1884, "IPV6_ADDR_COMPATv4 type - fast conversion");
snprintf(tempstring, sizeof(tempstring), "::%u.%u.%u.%u", (unsigned int) ipv6addrp->in6_addr.s6_addr[12], (unsigned int) ipv6addrp->in6_addr.s6_addr[13], (unsigned int) ipv6addrp->in6_addr.s6_addr[14], (unsigned int) ipv6addrp->in6_addr.s6_addr[15]);
retval = 0;
} else if ( (ipv6addrp->typeinfo & IPV6_ADDR_MAPPED) != 0 ) {
/* mapped address */
DEBUGPRINT_NA(DEBUG_librfc1884, "IPV6_ADDR_MAPPED type - fast conversion");
snprintf(tempstring, sizeof(tempstring), "::%x:%u.%u.%u.%u", (unsigned int) ipv6addr_getword(ipv6addrp, 5), (unsigned int) ipv6addrp->in6_addr.s6_addr[12], (unsigned int) ipv6addrp->in6_addr.s6_addr[13], (unsigned int) ipv6addrp->in6_addr.s6_addr[14], (unsigned int) ipv6addrp->in6_addr.s6_addr[15]);
retval = 0;
} else if ( (ipv6addr_getdword(ipv6addrp, 0) == 0) && (ipv6addr_getdword(ipv6addrp, 1) == 0) && (ipv6addr_getdword(ipv6addrp, 2) == 0) && (ipv6addr_getdword(ipv6addrp, 3) == 0) ) {
/* unspecified address */
DEBUGPRINT_NA(DEBUG_librfc1884, "unspecified address - fast conversion");
snprintf(tempstring, sizeof(tempstring), "::");
retval = 0;
} else if ( (ipv6addr_getdword(ipv6addrp, 0) == 0) && (ipv6addr_getdword(ipv6addrp, 1) == 0) && (ipv6addr_getdword(ipv6addrp, 2) == 0) && (ipv6addr_getdword(ipv6addrp, 3) == 1) ) {
/* loopback address */
DEBUGPRINT_NA(DEBUG_librfc1884, "loopback - fast conversion");
snprintf(tempstring, sizeof(tempstring), "::1");
retval = 0;
} else {
/* normal address */
if ( ((ipv6addrp->typeinfo & IPV6_ADDR_IID_32_63_HAS_IPV4) != 0) && ((ipv6addrp->typeinfo & IPV6_ADDR_ANONYMIZED_IID) == 0)) {
w_max = 5;
};
DEBUGPRINT_NA(DEBUG_librfc1884, "normal address, detect '0' blocks now");
for ( i = 0; i <= w_max; i++ ) {
if ( ipv6addr_getword(ipv6addrp, (unsigned int) i) == 0 ) {
/* found a '0' */
DEBUGPRINT_WA(DEBUG_librfc1884, "Found '0' in word '%d'", i);
if ( tstart == -1 ) {
/* possible starting '0' block */
DEBUGPRINT_WA(DEBUG_librfc1884, "Found a possible '0' starting block at '%d'", i);
tstart = i;
};
} else {
/* end of a '0' block */
DEBUGPRINT_WA(DEBUG_librfc1884, "Found non '0' in word '%d'", i);
if ( tstart != -1 ) {
tend = i - 1;
if ( ( tend - tstart ) >= 0 ) {
/* ok, a block with 1 or more '0' */
DEBUGPRINT_WA(DEBUG_librfc1884, "Found a '0' block from '%d' to '%d' with length '%d'", tstart, tend, tend - tstart + 1);
if ( zstart < 0 ) {
/* no other block before, init */
zstart = tstart;
zend = tend;
DEBUGPRINT_WA(DEBUG_librfc1884, "First found '0' block from '%d' to '%d' with length '%d'", zstart, zend, zend - zstart + 1);
} else if ( ( zend - zstart ) < ( tend - tstart ) ) {
/* ok, bigger block found */
zstart = tstart;
zend = tend;
DEBUGPRINT_WA(DEBUG_librfc1884, "Found bigger '0' block from '%d' to '%d' with length '%d'", zstart, zend, zend - zstart + 1);
} else {
DEBUGPRINT_NA(DEBUG_librfc1884, "This '0' block is not bigger than the last one - skip");
};
};
tstart = -1;
tend = -1;
};
};
};
/* cleanup */
if ( tstart >= 0 ) {
tend = w_max;
/* trailing '0' block */
if ( ( tend - tstart ) > 0 ) {
/* ok, a block with 2 or more '0' */
if ( zstart < 0 ) {
/* no other block before, init */
zstart = tstart;
zend = tend;
} else if ( ( zend - zstart ) < ( tend - tstart ) ) {
/* ok, bigger block found */
zstart = tstart;
zend = tend;
};
};
};
if ( zstart != -1 ) {
DEBUGPRINT_WA(DEBUG_librfc1884, "biggest '0' block is from word '%d' to '%d'", zstart, zend);
} else {
DEBUGPRINT_NA(DEBUG_librfc1884, "no '0' block found");
};
/* create string */
tempstring[0] = '\0';
for ( i = 0; i <= w_max; i++ ) {
if ( i == zstart ) {
DEBUGPRINT_WA(DEBUG_librfc1884, "start of '0' at '%d'", i);
snprintf(temp2string, sizeof(temp2string), "%s:", tempstring);
} else if ( i == 0 ) {
DEBUGPRINT_WA(DEBUG_librfc1884, "normal start value at '%d' (%x)", i, (unsigned int) ipv6addr_getword(ipv6addrp, (unsigned int) i));
snprintf(temp2string, sizeof(temp2string), "%x", (unsigned int) ipv6addr_getword(ipv6addrp, (unsigned int) i));
} else if ( ( i > zend ) || ( i < zstart ) ) {
snprintf(temp2string, sizeof(temp2string), "%s:%x", tempstring, (unsigned int) ipv6addr_getword(ipv6addrp, (unsigned int) i));
} else if ( ( i == 7 ) && ( zend == i )) {
snprintf(temp2string, sizeof(temp2string), "%s:", tempstring);
};
snprintf(tempstring, sizeof(tempstring), "%s", temp2string);
};
if ( ((ipv6addrp->typeinfo & IPV6_ADDR_IID_32_63_HAS_IPV4) != 0) && ((ipv6addrp->typeinfo & IPV6_ADDR_ANONYMIZED_IID) == 0)) {
/* append IPv4 address */
snprintf(temp2string, sizeof(temp2string), "%s:%u.%u.%u.%u", \
tempstring, \
(unsigned int) ipv6addrp->in6_addr.s6_addr[12], \
(unsigned int) ipv6addrp->in6_addr.s6_addr[13], \
(unsigned int) ipv6addrp->in6_addr.s6_addr[14], \
(unsigned int) ipv6addrp->in6_addr.s6_addr[15] \
);
snprintf(tempstring, sizeof(tempstring), "%s", temp2string);
};
DEBUGPRINT_WA(DEBUG_librfc1884, "new method: '%s'", tempstring);
retval = 0;
};
if ( ( retval == 0 ) && ( ipv6addrp->flag_prefixuse == 1 ) && ((formatoptions & FORMATOPTION_literal) == 0) ) {
snprintf(resultstring, resultstring_length, "%s/%u", tempstring, (unsigned int) ipv6addrp->prefixlength);
} else {
if ((formatoptions & FORMATOPTION_literal) != 0) {
/* replace : by - */
for (s = 0; s < strlen(tempstring); s++) {
if (tempstring[s] == ':') {
tempstring[s] = '-';
};
};
if (ipv6addrp->flag_scopeid) {
snprintf(resultstring, resultstring_length, "%ss%s.ipv6-literal.net", tempstring, ipv6addrp->scopeid);
} else {
snprintf(resultstring, resultstring_length, "%s.ipv6-literal.net", tempstring);
};
} else {
if (ipv6addrp->flag_scopeid) {
snprintf(resultstring, resultstring_length, "%s%%%s", tempstring, ipv6addrp->scopeid);
} else {
snprintf(resultstring, resultstring_length, "%s", tempstring);
};
};
};
if ( (formatoptions & FORMATOPTION_printlowercase) != 0 ) {
/* nothing to do */
} else if ( (formatoptions & FORMATOPTION_printuppercase) != 0 ) {
string_to_upcase(resultstring);
};
if ( (formatoptions & FORMATOPTION_machinereadable) != 0 ) {
snprintf(temp2string, sizeof(temp2string), "IPV6=%s", resultstring);
snprintf(resultstring, resultstring_length, "%s", temp2string);
};
DEBUGPRINT_WA(DEBUG_librfc1884, "Result: '%s'", resultstring);
return (retval);
};
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