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main.c
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main.c
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/* main.c - a netmask generator
*
* Copyright (c) 2013 Robert Stone <[email protected]>,
* Tom Lear <[email protected]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <arpa/inet.h>
#include <errno.h>
#include <getopt.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <math.h>
#include "netmask.h"
#include "errors.h"
#include "config.h"
struct addrmask {
u_int32_t neta;
u_int32_t mask;
struct addrmask *next;
struct addrmask *prev;
};
struct option longopts[] = {
{ "version", 0, 0, 'v' },
{ "help", 0, 0, 'h' },
{ "debug", 0, 0, 'd' },
{ "standard", 0, 0, 's' },
{ "cidr", 0, 0, 'c' },
{ "cisco", 0, 0, 'i' },
{ "range", 0, 0, 'r' },
{ "hex", 0, 0, 'x' },
{ "octal", 0, 0, 'o' },
{ "binary", 0, 0, 'b' },
{ "nodns", 0, 0, 'n' },
{ "files", 0, 0, 'f' },
// { "max", 1, 0, 'M' },
// { "min", 1, 0, 'm' },
{ NULL, 0, 0, 0 }
};
typedef enum {
OUT_STD, OUT_CIDR, OUT_CISCO, OUT_RANGE, OUT_HEX, OUT_OCTAL, OUT_BINARY
} output_t;
char version[] = "netmask, version "VERSION;
char vversion[] = __DATE__" "__TIME__;
char usage[] = "Try `%s --help' for more information.\n";
char *progname = NULL;
void disp_std(int domain, nm_addr *n, nm_addr *m) {
char nb[INET6_ADDRSTRLEN + 1],
mb[INET6_ADDRSTRLEN + 1];
inet_ntop(domain, n, nb, INET6_ADDRSTRLEN);
inet_ntop(domain, m, mb, INET6_ADDRSTRLEN);
printf("%15s/%-15s\n", nb, mb);
}
static void disp_cidr(int domain, nm_addr *n, nm_addr *m) {
char nb[INET6_ADDRSTRLEN + 1];
int cidr = 0;
inet_ntop(domain, n, nb, INET6_ADDRSTRLEN);
if(domain == AF_INET) {
uint32_t mask;
for(mask = ntohl(m->s.s_addr); mask; mask <<= 1)
cidr++;
} else {
uint8_t i, c;
for(i = 0; i < 16; i++)
for(c = m->s6.s6_addr[i]; c; c <<= 1)
cidr++;
}
printf("%15s/%d\n", nb, cidr);
}
static void disp_cisco(int domain, nm_addr *n, nm_addr *m) {
char nb[INET6_ADDRSTRLEN + 1],
mb[INET6_ADDRSTRLEN + 1];
int i;
if(domain == AF_INET6)
for(i = 0; i < 16; i++)
m->s6.s6_addr[i] = ~m->s6.s6_addr[i];
else
m->s.s_addr = ~m->s.s_addr;
inet_ntop(domain, n, nb, INET6_ADDRSTRLEN);
inet_ntop(domain, m, mb, INET6_ADDRSTRLEN);
printf("%15s %-15s\n", nb, mb);
}
static void range_num(char *dst, uint8_t *src) {
/* roughly we must convert a 17 digit base 256 number
* to a 39 digit base 10 number. */
char digits[41] = { 0 }; /* ceil(17 * log(256) / log(10)) == 41 */
int i, j, z, overflow;
for(i = 0; i < 17; i++) {
overflow = 0;
for(j = sizeof(digits) - 1; j >= 0; j--) {
int tmp = digits[j] * 256 + overflow;
digits[j] = tmp % 10;
overflow = tmp / 10;
}
overflow = src[i];
for(j = sizeof(digits) - 1; j >= 0; j--) {
if(!overflow)
break;
int sum = digits[j] + overflow;
digits[j] = sum % 10;
overflow = sum / 10;
}
}
/* convert to string */
z = 1;
for(i = 0; i < sizeof(digits); i++) {
if(z && digits[i] == 0)
continue;
z = 0;
*dst++ = '0' + digits[i];
}
/* special case for zero */
if(z)
*dst++ = '0';
*dst++ = '\0';
}
static void disp_range(int domain, nm_addr *n, nm_addr *m) {
char nb[INET6_ADDRSTRLEN + 1],
mb[INET6_ADDRSTRLEN + 1],
ns[42];
uint64_t over = 1;
uint8_t ra[17] = { 0 };
int i;
if(domain == AF_INET6) {
for(i = 15; i >= 0; i--) {
m->s6.s6_addr[i] = ~m->s6.s6_addr[i];
over += m->s6.s6_addr[i];
m->s6.s6_addr[i] |= n->s6.s6_addr[i];
ra[i + 1] = over & 0xff;
over >>= 8;
}
ra[0] = over;
} else {
over += htonl(~m->s.s_addr);
for(i = 16; i > 11; i--) {
ra[i] = over & 0xff;
over >>= 8;
}
m->s.s_addr = n->s.s_addr | ~m->s.s_addr;
}
range_num(ns, ra);
inet_ntop(domain, n, nb, INET6_ADDRSTRLEN);
inet_ntop(domain, m, mb, INET6_ADDRSTRLEN);
printf("%15s-%-15s (%s)\n", nb, mb, ns);
}
static void disp_hex(int domain, nm_addr *n, nm_addr *m) {
if(domain == AF_INET) {
printf("0x%08x/0x%08x\n", htonl(n->s.s_addr), htonl(m->s.s_addr));
} else {
printf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x/"
"0x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x\n",
n->s6.s6_addr[0], n->s6.s6_addr[1], n->s6.s6_addr[2], n->s6.s6_addr[3],
n->s6.s6_addr[4], n->s6.s6_addr[5], n->s6.s6_addr[6], n->s6.s6_addr[7],
n->s6.s6_addr[8], n->s6.s6_addr[9], n->s6.s6_addr[10], n->s6.s6_addr[11],
n->s6.s6_addr[12], n->s6.s6_addr[13], n->s6.s6_addr[14], n->s6.s6_addr[15],
m->s6.s6_addr[0], m->s6.s6_addr[1], m->s6.s6_addr[2], m->s6.s6_addr[3],
m->s6.s6_addr[4], m->s6.s6_addr[5], m->s6.s6_addr[6], m->s6.s6_addr[7],
m->s6.s6_addr[8], m->s6.s6_addr[9], m->s6.s6_addr[10], m->s6.s6_addr[11],
m->s6.s6_addr[12], m->s6.s6_addr[13], m->s6.s6_addr[14], m->s6.s6_addr[15]);
}
}
static void disp_octal(int domain, nm_addr *n, nm_addr *m) {
if(domain == AF_INET) {
printf("0%10o/0%10o\n", htonl(n->s.s_addr), htonl(m->s.s_addr));
} else {
printf("0%03x%03x%03x%03x%03x%03x%03x%03x"
"%03x%03x%03x%03x%03x%03x%03x%03x/"
"0%03x%03x%03x%03x%03x%03x%03x%03x"
"%03x%03x%03x%03x%03x%03x%03x%03x\n",
n->s6.s6_addr[0], n->s6.s6_addr[1], n->s6.s6_addr[2], n->s6.s6_addr[3],
n->s6.s6_addr[4], n->s6.s6_addr[5], n->s6.s6_addr[6], n->s6.s6_addr[7],
n->s6.s6_addr[8], n->s6.s6_addr[9], n->s6.s6_addr[10], n->s6.s6_addr[11],
n->s6.s6_addr[12], n->s6.s6_addr[13], n->s6.s6_addr[14], n->s6.s6_addr[15],
m->s6.s6_addr[0], m->s6.s6_addr[1], m->s6.s6_addr[2], m->s6.s6_addr[3],
m->s6.s6_addr[4], m->s6.s6_addr[5], m->s6.s6_addr[6], m->s6.s6_addr[7],
m->s6.s6_addr[8], m->s6.s6_addr[9], m->s6.s6_addr[10], m->s6.s6_addr[11],
m->s6.s6_addr[12], m->s6.s6_addr[13], m->s6.s6_addr[14], m->s6.s6_addr[15]);
}
}
static void bin_str(char *dst, uint8_t *src, int len) {
int i;
int j;
for(i = 0; i < len; i++) {
for(j = 7; j >= 0; j--) {
*dst++ = src[i] & (1 << j) ? '1' : '0';
}
*dst++ = ' ';
}
/* replace the last space with a string terminator */
dst[-1] = '\0';
}
static void disp_binary(int domain, nm_addr *n, nm_addr *m) {
char ns[144],
ms[144];
uint8_t bits[16];
if(domain == AF_INET) {
unsigned long l;
l = htonl(n->s.s_addr);
bits[0] = 0xff & (l >> 24);
bits[1] = 0xff & (l >> 16);
bits[2] = 0xff & (l >> 8);
bits[3] = 0xff & (l >> 0);
bin_str(ns, bits, 4);
l = htonl(m->s.s_addr);
bits[0] = 0xff & (l >> 24);
bits[1] = 0xff & (l >> 16);
bits[2] = 0xff & (l >> 8);
bits[3] = 0xff & (l >> 0);
bin_str(ms, bits, 4);
} else {
bin_str(ns, n->s6.s6_addr, 16);
bin_str(ms, m->s6.s6_addr, 16);
}
printf("%s / %s\n", ns, ms);
}
void display(NM nm, output_t style) {
void (*disp)(int, nm_addr *, nm_addr *) = NULL;
switch(style) {
case OUT_STD: disp = &disp_std; break;
case OUT_CIDR: disp = &disp_cidr; break;
case OUT_CISCO: disp = &disp_cisco; break;
case OUT_RANGE: disp = &disp_range; break;
case OUT_HEX: disp = &disp_hex; break;
case OUT_OCTAL: disp = &disp_octal; break;
case OUT_BINARY: disp = &disp_binary; break;
default: return;
}
nm_walk(nm, disp);
}
static inline void add_entry(NM *nm, const char *str, int dns) {
NM new = nm_new_str(str, dns);
if(new)
*nm = nm_merge(*nm, new);
else
warn("parse error \"%s\"", str);
}
int main(int argc, char *argv[]) {
int optc, h = 0, v = 0, f = 0, dns = NM_USE_DNS, lose = 0;
// u_int32_t min = ~0, max = 0;
output_t output = OUT_CIDR;
progname = argv[0];
initerrors(progname, 0, 0); /* stderr, nostatus */
while((optc = getopt_long(argc, argv, "shoxdrvbincM:m:f", longopts,
(int *) NULL)) != EOF) switch(optc) {
case 'h': h = 1; break;
case 'v': v++; break;
case 'n': dns = 0; break;
case 'f': f = 1; break;
// case 'M': max = mspectou32(optarg); break;
// case 'm': min = mspectou32(optarg); break;
case 'd':
initerrors(NULL, -1, 1); /* showstatus */
break;
case 's': output = OUT_STD; break;
case 'c': output = OUT_CIDR; break;
case 'i': output = OUT_CISCO; break;
case 'r': output = OUT_RANGE; break;
case 'x': output = OUT_HEX; break;
case 'o': output = OUT_OCTAL; break;
case 'b': output = OUT_BINARY; break;
default: lose = 1; break;
}
if(v) {
if(v == 1) fprintf(stderr, "%s\n", version);
else fprintf(stderr, "%s, %s\n", version, vversion);
if(!h) exit(0);
}
if(h) {
fprintf(stderr,
"This is netmask, an address netmask generation utility\n"
"Usage: %s spec [spec ...]\n"
" -h, --help\t\t\tPrint a summary of the options\n"
" -v, --version\t\t\tPrint the version number\n"
" -d, --debug\t\t\tPrint status/progress information\n"
" -s, --standard\t\tOutput address/netmask pairs\n"
" -c, --cidr\t\t\tOutput CIDR format address lists\n"
" -i, --cisco\t\t\tOutput Cisco style address lists\n"
" -r, --range\t\t\tOutput ip address ranges\n"
" -x, --hex\t\t\tOutput address/netmask pairs in hex\n"
" -o, --octal\t\t\tOutput address/netmask pairs in octal\n"
" -b, --binary\t\t\tOutput address/netmask pairs in binary\n"
" -n, --nodns\t\t\tDisable DNS lookups for addresses\n"
" -f, --files\t\t\tTreat arguments as input files\n"
// " -M, --max mask\t\tLimit maximum mask size\n"
// " -m, --min mask\t\tLimit minimum mask size (drop small ranges)\n"
"Definitions:\n"
" a spec can be any of:\n"
" address\n"
" address:address\n"
" address:+address\n"
" address/mask\n"
" an address can be any of:\n"
" N\t\tdecimal number\n"
" 0N\t\toctal number\n"
" 0xN\t\thex number\n"
" N.N.N.N\tdotted quad\n"
" hostname\tdns domain name\n"
" a mask is the number of bits set to one from the left\n", progname);
exit(0);
}
if(lose || optind == argc) {
fprintf(stderr, usage, progname);
exit(1);
}
NM nm = NULL;
for(;optind < argc; optind++) {
if(f) {
char buf[1024];
FILE *fp = strncmp(argv[optind], "-", 2) ?
fopen(argv[optind], "r") : stdin;
if(!fp) {
fprintf(stderr, "fopen: %s: %s\n",
argv[optind], strerror(errno));
continue;
}
while(fscanf(fp, "%1023s", buf) != EOF)
add_entry(&nm, buf, dns);
} else
add_entry(&nm, argv[optind], dns);
}
display(nm, output);
return(0);
}