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netcalc.c
1525 lines (1279 loc) · 39 KB
/
netcalc.c
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/*
* DMS Tools and Utilities
* Copyright (C) 2011, 2021 David M. Syzdek <david@syzdek.net>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of David M. Syzdek nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID M. SYZDEK BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/**
* @file src/netcalc.c calculates network information for IP addresses
*/
/*
* Simple Build:
* gcc -W -Wall -O2 -c netcalc.c
* gcc -W -Wall -O2 -o netcalc netcalc.o
*
* GNU Libtool Build:
* libtool --mode=compile gcc -W -Wall -g -O2 -c netcalc.c
* libtool --mode=link gcc -W -Wall -g -O2 -o netcalc netcalc.lo
*
* GNU Libtool Install:
* libtool --mode=install install -c netcalc /usr/local/bin/netcalc
*
* GNU Libtool Clean:
* libtool --mode=clean rm -f netcalc.lo netcalc
*/
#define _DMSTOOLS_SRC_COLORS_C 1
///////////////
// //
// Headers //
// //
///////////////
// MARK: - Headers
#ifdef HAVE_COMMON_H
#include "common.h"
#endif
#include <assert.h>
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <inttypes.h>
#include <stdlib.h>
///////////////////
// //
// Definitions //
// //
///////////////////
// MARK: - Definitions
#ifndef PROGRAM_NAME
#define PROGRAM_NAME "netcalc"
#endif
#ifndef PACKAGE_BUGREPORT
#define PACKAGE_BUGREPORT "david@syzdek.net"
#endif
#ifndef PACKAGE_COPYRIGHT
#define PACKAGE_COPYRIGHT "Copyright David M. Syzdek"
#endif
#ifndef PACKAGE_NAME
#define PACKAGE_NAME "dmstools"
#endif
#ifndef PACKAGE_VERSION
#define PACKAGE_VERSION ""
#endif
#ifndef PARAMS
#define PARAMS(protos) protos
#endif
#define NETCALC_ALL_NETWORKS 0x0001
#define NETCALC_IPV6_EXPAND 0x0002
#define NETCALC_IPV6_FULL 0x0004
#define NETCALC_NO_MAP 0x0008
#define NETCALC_VERBOSE 0x0010
#define NETCALC_LIST 0x0020
#define NETCALC_SUPERBLOCK 0x0040
#define NETCALC_INET 4
#define NETCALC_INET6 6
/////////////////
// //
// Datatypes //
// //
/////////////////
// MARK: - Datatypes
typedef struct _netcalc_ip netcalc_ip;
typedef struct _netcalc netcalc;
struct _netcalc_ip
{
int32_t cidr;
uint32_t addr[8];
};
struct _netcalc
{
int32_t cidr;
int32_t cidr_limit;
int32_t cidr_incr;
int32_t family;
int32_t display;
int32_t pad32;
uint64_t opts;
size_t count;
netcalc_ip * lower;
netcalc_ip * upper;
netcalc_ip * superblock;
netcalc_ip ** list;
size_t list_len;
int padint;
int len_address;
int len_netmask;
int len_broadcast;
int len_network;
int len_wildmask;
};
//////////////////
// //
// Prototypes //
// //
//////////////////
// MARK: - Prototypes
static void
netcalc_free(
netcalc * cnf );
static int
netcalc_init(
netcalc ** cnfp );
static int
netcalc_ip_append(
netcalc * cnf,
netcalc_ip * ip );
static int
netcalc_ip_cmp(
netcalc_ip * ip1,
netcalc_ip * ip2 );
static void
netcalc_ip_free(
netcalc_ip * ip );
static int
netcalc_ip_parse(
netcalc * cnf,
netcalc_ip ** ipp,
const char * str );
static int
netcalc_ip_parse_ipv4(
netcalc * cnf,
netcalc_ip * ip,
char * str );
static int
netcalc_ip_parse_ipv4_str(
netcalc * cnf,
netcalc_ip * ip,
char * str );
static int
netcalc_ip_parse_ipv6(
netcalc * cnf,
netcalc_ip * ip,
char * str );
static int
netcalc_ip_string(
netcalc * cnf,
netcalc_ip * ip,
char * str,
size_t size );
static int
netcalc_ip_string_ipv4(
netcalc * cnf,
netcalc_ip * ip,
char * str,
size_t size );
static int
netcalc_ip_string_ipv6(
netcalc * cnf,
netcalc_ip * ip,
char * str,
size_t size );
static int
netcalc_ip_parse_ipv6_mapped_ipv4(
netcalc * cnf,
netcalc_ip * ip,
char * node );
static void
netcalc_net_broadcast_r(
netcalc_ip * broadcast,
netcalc_ip * ip,
int32_t cidr );
static int
netcalc_net_cmp(
netcalc_ip * ip1,
netcalc_ip * ip2,
int32_t cidr );
static void
netcalc_net_netmask_r(
netcalc_ip * netmask,
int32_t cidr );
static void
netcalc_net_network_r(
netcalc_ip * network,
netcalc_ip * ip,
int32_t cidr );
static int
netcalc_net_sort_cmp(
const void * ap,
const void * bp );
static void
netcalc_net_wildmask_r(
netcalc_ip * wildmask,
int32_t cidr );
static void
netcalc_print_ip(
netcalc * cnf,
netcalc_ip * ip,
int32_t cidr,
uint64_t opts );
static void
netcalc_print_space(
netcalc * cnf,
netcalc_ip * ip,
int32_t cidr );
static void
netcalc_results_default(
netcalc * cnf );
static void
netcalc_results_list(
netcalc * cnf );
static void
netcalc_results_verbose(
netcalc * cnf );
static void
netcalc_usage( void );
static void
netcalc_version( void );
extern int
main(
int argc,
char * argv[] );
/////////////////
// //
// Variables //
// //
/////////////////
// MARK: - Variables
char buff[1024];
/////////////////
// //
// Functions //
// //
/////////////////
// MARK: - Functions
void
netcalc_free(
netcalc * cnf )
{
size_t pos;
if (!(cnf))
return;
for(pos = 0; (pos < cnf->list_len); pos++)
{
netcalc_ip_free(cnf->list[pos]);
cnf->list[pos] = NULL;
};
if (cnf->superblock != NULL)
{
netcalc_ip_free(cnf->superblock);
cnf->superblock = NULL;
};
bzero(cnf, sizeof(netcalc));
free(cnf);
return;
}
int
netcalc_init(
netcalc ** cnfp )
{
assert(cnfp != NULL);
if ((*cnfp = malloc(sizeof(netcalc))) == NULL)
{
fprintf(stderr, "%s: out of virtual memory\n", PROGRAM_NAME);
return(1);
};
bzero(*cnfp, sizeof(netcalc));
if (((*cnfp)->list = malloc(sizeof(netcalc_ip *))) == NULL)
{
netcalc_free(*cnfp);
fprintf(stderr, "%s: out of virtual memory\n", PROGRAM_NAME);
return(1);
};
(*cnfp)->list[0] = NULL;
if (((*cnfp)->superblock = malloc(sizeof(netcalc_ip))) == NULL)
{
netcalc_free(*cnfp);
fprintf(stderr, "%s: out of virtual memory\n", PROGRAM_NAME);
return(1);
};
bzero((*cnfp)->superblock, sizeof(netcalc_ip));
(*cnfp)->cidr = 128;
(*cnfp)->cidr_limit = -1;
(*cnfp)->cidr_incr = -1;
(*cnfp)->family = NETCALC_INET;
(*cnfp)->display = NETCALC_INET;
(*cnfp)->len_address = strlen("SUPERBLOCK");;
(*cnfp)->len_netmask = 7;
(*cnfp)->len_network = 7;
(*cnfp)->len_wildmask = 8;
(*cnfp)->len_broadcast = 9;
return(0);
}
int
netcalc_ip_append(
netcalc * cnf,
netcalc_ip * ip )
{
size_t size;
void * ptr;
assert(cnf != NULL);
assert(ip != NULL);
size = sizeof(netcalc_ip *) * (cnf->list_len+1);
if ((ptr = realloc(cnf->list, size)) == NULL)
{
fprintf(stderr, "%s:%i: out of virtual memory\n", PROGRAM_NAME, __LINE__);
return(1);
};
cnf->list = ptr;
cnf->list[cnf->list_len] = ip;
cnf->list_len++;
return(0);
}
int
netcalc_ip_cmp(
netcalc_ip * ip1,
netcalc_ip * ip2 )
{
int pos;
assert(ip1 != NULL);
assert(ip2 != NULL);
for(pos = 0; ((pos < 7) && (ip1->addr[pos] == ip2->addr[pos])); pos++);
if (ip1->addr[pos] < ip2->addr[pos])
return(-1);
if (ip1->addr[pos] > ip2->addr[pos])
return(1);
return(0);
}
void
netcalc_ip_free(
netcalc_ip * ip )
{
if (!(ip))
return;
bzero(ip, sizeof(netcalc_ip));
free(ip);
return;
}
int
netcalc_ip_parse(
netcalc * cnf,
netcalc_ip ** ipp,
const char * str )
{
netcalc_ip * ip;
char * ptr;
char * endptr;
char * tmp;
assert(cnf != NULL);
// allocate memory
if ((ip = malloc(sizeof(netcalc_ip))) == NULL)
{
fprintf(stderr, "%s: out of virtual memory\n", PROGRAM_NAME);
return(1);
};
ip->cidr = -1;
if ((tmp = strdup(str)) == NULL)
{
netcalc_ip_free(ip);
fprintf(stderr, "%s: out of virtual memory\n", PROGRAM_NAME);
return(1);
};
// parses CIDR
if ((ptr = strrchr(tmp, '/')) != NULL)
{
ptr[0] = '\0';
ip->cidr = (int32_t)strtol(&ptr[1], &endptr, 0);
if ((endptr[0] != '\0') || (&ptr[1] == endptr))
{
fprintf(stderr, "%s: invalid CIDR\n", PROGRAM_NAME);
netcalc_ip_free(ip);
free(tmp);
return(1);
};
};
// parses string
if (strchr(tmp, ':') == NULL)
{
if (netcalc_ip_parse_ipv4(cnf, ip, tmp) != 0)
{
netcalc_ip_free(ip);
free(tmp);
return(1);
};
} else {
if (netcalc_ip_parse_ipv6(cnf, ip, tmp) != 0)
{
netcalc_ip_free(ip);
free(tmp);
return(1);
};
};
// normalizes CIDR
if (ip->cidr == -1)
ip->cidr = 128;
if ((cnf->cidr > ip->cidr) && (ip->cidr != -1))
cnf->cidr = ip->cidr;
// frees resources
free(tmp);
*ipp = ip;
return(0);
}
int
netcalc_ip_parse_ipv4(
netcalc * cnf,
netcalc_ip * ip,
char * str )
{
assert(cnf != NULL);
assert(ip != NULL);
// verifies cidr
if ((ip->cidr < -1) || (ip->cidr > 32))
{
fprintf(stderr, "%s: invalid CIDR\n", PROGRAM_NAME);
return(1);
};
// normalizes CIDR for IPv6
if (ip->cidr >= 0)
ip->cidr += 128 - 32;
// sets prefix for IPv6 mapped IPv4 addresses
ip->addr[5] = 0xffff;
// parses IPv4 string
return(netcalc_ip_parse_ipv4_str(cnf, ip, str));
}
int
netcalc_ip_parse_ipv4_str(
netcalc * cnf,
netcalc_ip * ip,
char * str )
{
uint32_t addr;
uint32_t octet;
int pos;
char * ptr;
char * endptr;
char * nodes[4];
assert(cnf != NULL);
assert(ip != NULL);
assert(str != NULL);
// set state
addr = 0;
// splits octets
for(pos = 0; (pos < 3); pos++)
{
nodes[pos] = str;
if ((ptr = strchr(str, '.')) == NULL)
{
fprintf(stderr, "%s: invalid IPv4 address\n", PROGRAM_NAME);
return(1);
};
ptr[0] = '\0';
str = &ptr[1];
};
nodes[pos] = str;
// parses octets
for(pos = 0; (pos < 4); pos++)
{
octet = (uint32_t)strtoul(nodes[pos], &endptr, 10);
if ((nodes[pos] == endptr) || (endptr[0] != '\0') || (octet > 255))
{
fprintf(stderr, "%s: invalid IPv4 address\n", PROGRAM_NAME);
return(1);
};
addr = (addr << 8) | (octet & 0xff);
};
// stores address data
ip->addr[6] = (addr >> 16) & 0xffff;
ip->addr[7] = (addr >> 0) & 0xffff;
return(0);
}
int
netcalc_ip_parse_ipv6(
netcalc * cnf,
netcalc_ip * ip,
char * str )
{
int pos;
int rev;
int compress;
char * nodes[9];
char * ptr;
char * endptr;
assert(cnf != NULL);
assert(ip != NULL);
cnf->family = NETCALC_INET6;
// verifies cidr
if ((ip->cidr < -1) || (ip->cidr > 128))
{
fprintf(stderr, "%s: invalid CIDR\n", PROGRAM_NAME);
return(1);
};
// verifies zero compression
compress = 0;
for(pos = 1; (pos < (int)strlen(str)); pos++)
if ((str[pos-0] == ':') && (str[pos-1] == ':'))
compress++;
if (compress > 1)
{
fprintf(stderr, "%s:%i: invalid IPv6 address\n", PROGRAM_NAME, __LINE__);
return(1);
};
// set state
bzero(nodes, sizeof(nodes));
// splits octets
for(pos = 0; ((pos < 8) && (str[0] != ':') && ((ptr = strchr(str, ':')) != NULL)); pos++)
{
nodes[pos] = str;
str = &ptr[1];
ptr[0] = '\0';
};
for(rev = 7; ((rev > 0) && ((ptr = strrchr(str, ':')) != NULL)); rev--)
{
ptr[0] = '\0';
nodes[rev] = &ptr[1];
if ((rev == 7) && ((strchr(nodes[rev], '.'))))
rev--;
};
nodes[rev] = str;
if (rev < pos)
{
fprintf(stderr, "%s:%i: invalid IPv6 address\n", PROGRAM_NAME, __LINE__);
return(1);
};
// converts string to numeric data
for(pos = 0; (pos < 8); pos++)
{
if (!(nodes[pos]))
continue;
if (!(nodes[pos][0]))
continue;
ip->addr[pos] = (uint32_t)strtoul(nodes[pos], &endptr, 16);
if ((pos == 7) && (endptr[0] == '.'))
return(netcalc_ip_parse_ipv6_mapped_ipv4(cnf, ip, nodes[7]));
if ( (nodes[pos] == endptr) || (endptr[0] != '\0') || (ip->addr[pos] > 0xffff) )
{
fprintf(stderr, "%s:%i: invalid IPv6 address\n", PROGRAM_NAME, __LINE__);
return(1);
};
};
return(0);
}
int
netcalc_ip_parse_ipv6_mapped_ipv4(
netcalc * cnf,
netcalc_ip * ip,
char * node )
{
int pos;
assert(cnf != NULL);
assert(ip != NULL);
assert(node != NULL);
// verify syntax
for(pos = 0; (pos < 5); pos++)
{
if (ip->addr[pos] != 0)
{
fprintf(stderr, "%s:%i: invalid IPv6 address\n", PROGRAM_NAME, __LINE__);
return(1);
};
};
if (ip->addr[5] != 0xffff)
{
fprintf(stderr, "%s:%i: invalid IPv6 address\n", PROGRAM_NAME, __LINE__);
return(1);
};
return(netcalc_ip_parse_ipv4_str(cnf, ip, node));
}
int
netcalc_ip_string(
netcalc * cnf,
netcalc_ip * ip,
char * str,
size_t size )
{
if (cnf->display == NETCALC_INET)
return(netcalc_ip_string_ipv4(cnf, ip, str, size));
return(netcalc_ip_string_ipv6(cnf, ip, str, size));
}
int
netcalc_ip_string_ipv4(
netcalc * cnf,
netcalc_ip * ip,
char * str,
size_t size )
{
assert(cnf != NULL);
assert(ip != NULL);
assert(str != NULL);
assert(size > 0);
snprintf(
str,
size,
"%i.%i.%i.%i",
(ip->addr[6] >> 8),
(ip->addr[6] & 0xff),
(ip->addr[7] >> 8),
(ip->addr[7] & 0xff)
);
return(0);
}
int
netcalc_ip_string_ipv6(
netcalc * cnf,
netcalc_ip * ip,
char * str,
size_t size )
{
char b[32];
char * ptr;
int ipv4mapped;
int padding;
int pos;
int zero_offset;
int zero_len;
int offset;
assert(cnf != NULL);
assert(ip != NULL);
assert(str != NULL);
assert(size > 0);
// set state
str[0] = '\0';
// calculates zero compression
zero_offset = 0;
zero_len = 0;
for(pos = 0; (pos < 8); pos++)
{
if (ip->addr[pos] == 0)
{
offset = pos;
while((ip->addr[pos] == 0) && (pos < 8))
pos++;
if ((pos - offset) > zero_len)
{
zero_offset = offset;
zero_len = pos - offset;
};
};
};
// determines if IPv4 mapped address
ipv4mapped = (zero_offset == 0) ? 1 : 0;
ipv4mapped = (zero_len == 5) ? ipv4mapped : 0;
ipv4mapped = (ip->addr[5] == 0xffff) ? ipv4mapped : 0;
ipv4mapped = (!(cnf->opts & NETCALC_NO_MAP)) ? ipv4mapped : 0;
// prints full IP address
if ((cnf->opts & NETCALC_IPV6_FULL) != 0)
{
if ((ipv4mapped))
{
snprintf(
str,
size,
"0:0:0:0:0:ffff:%i.%i.%i.%i",
(ip->addr[6] >> 8),
(ip->addr[6] & 0xff),
(ip->addr[7] >> 8),
(ip->addr[7] & 0xff)
);
} else {
padding = (cnf->opts & NETCALC_IPV6_EXPAND) ? 4 : 0;
for(pos = 0; (pos < 7); pos++)
{
snprintf(b, sizeof(b), "%0*x:", padding, ip->addr[pos]);
strncat(str, b, size);
};
snprintf(b, sizeof(b), "%0*x", padding, ip->addr[7]);
strncat(str, b, size);
};
return(0);
};
// prints IPv4 mapped address
if ((ipv4mapped))
{
snprintf(
str,
size,
"::ffff:%i.%i.%i.%i",
(ip->addr[6] >> 8),
(ip->addr[6] & 0xff),
(ip->addr[7] >> 8),
(ip->addr[7] & 0xff)
);
return(0);
};
// prints IPv6 prefix
for(pos = 0; (pos < 8); pos++)
{
if ((pos == zero_offset) && (zero_len > 1))
{
strncat(str, ((pos == 0) ? "::" : ":"), size);
pos += zero_len - 1;
if (pos > 6)
strncat(str, ":", size);
} else {
snprintf(b, sizeof(b), "%x:", ip->addr[pos]);
strncat(str, b, size);
};
};
ptr = strrchr(str, ':');
ptr[0] = '\0';
return(0);
}
void
netcalc_net_broadcast_r(
netcalc_ip * broadcast,
netcalc_ip * ip,
int32_t cidr )
{
int pos;
netcalc_ip wildmask;
netcalc_net_wildmask_r(&wildmask, cidr);
for(pos = 0; (pos < 8); pos++)
broadcast->addr[pos] = ip->addr[pos] | wildmask.addr[pos];
return;
}
int
netcalc_net_cmp(
netcalc_ip * ip1,
netcalc_ip * ip2,
int32_t cidr )
{
int i;
netcalc_ip m;
assert(ip1 != NULL);
assert(ip2 != NULL);
netcalc_net_netmask_r(&m, cidr);
for(i = 0; ( (i < 7) && ((ip1->addr[i]&m.addr[i]) == (ip2->addr[i]&m.addr[i])) ); i++);
if ( (ip1->addr[i] & m.addr[i]) < (ip2->addr[i] & m.addr[i]) )
return(-1);
if ( (ip1->addr[i] & m.addr[i]) > (ip2->addr[i] & m.addr[i]) )
return(1);
return(0);
}
void
netcalc_net_netmask_r(
netcalc_ip * netmask,
int32_t cidr )
{
int32_t pos;
bzero(netmask, sizeof(netcalc_ip));
for(pos = 0; (pos < (cidr / 16)); pos++)
netmask->addr[pos] = 0xffff;
for(cidr %= 16; (cidr > 0); cidr--)
{
netmask->addr[pos] |= 0x10000;
netmask->addr[pos] >>= 1;
};
return;
}
void
netcalc_net_network_r(
netcalc_ip * network,
netcalc_ip * ip,
int32_t cidr )
{
int pos;
netcalc_ip netmask;
netcalc_net_netmask_r(&netmask, cidr);
for(pos = 0; (pos < 8); pos++)
network->addr[pos] = ip->addr[pos] & netmask.addr[pos];
network->cidr = cidr;
return;
}
int
netcalc_net_sort_cmp(
const void * ap,
const void * bp )
{
int i;
const netcalc_ip * a;
const netcalc_ip * b;
assert( ap != NULL );
assert( bp != NULL );
a = *(const netcalc_ip * const *) ap;
b = *(const netcalc_ip * const *) bp;
for(i = 0; ( (i < 7) && (a->addr[i] == b->addr[i]) ); i++);
if ( a->addr[i] < b->addr[i] )
return(-1);
if ( a->addr[i] > b->addr[i] )
return(1);
if ( a->cidr < b->cidr )
return(-1);
if ( a->cidr > b->cidr )
return(1);
return(0);
}
void
netcalc_net_wildmask_r(
netcalc_ip * wildmask,
int32_t cidr )
{