From 463675176c21b9ff11b30a632c5106237f6139e3 Mon Sep 17 00:00:00 2001 From: Konrad Rosenbaum Date: Thu, 24 Sep 2009 13:12:48 +0000 Subject: [PATCH] ip6calc release 1 git-svn-id: https://silmor.de/svn/misc/ip6calc@125 752dcaaa-03e5-0310-b894-97e397d490cd --- COPYING | 676 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 9 + README | 75 +++++++ ip6calc.c | 440 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 1200 insertions(+), 0 deletions(-) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 README create mode 100644 ip6calc.c diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..4432540 --- /dev/null +++ b/COPYING @@ -0,0 +1,676 @@ + + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. + diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..08e4588 --- /dev/null +++ b/Makefile @@ -0,0 +1,9 @@ +############################## +# Makefile for ip6calc + +CC=gcc +CFLAGS=-Wall -g +LDFLAGS= + +ip6calc: ip6calc.c + $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ diff --git a/README b/README new file mode 100644 index 0000000..cf32d77 --- /dev/null +++ b/README @@ -0,0 +1,75 @@ +README for ip6calc +==================== + +IPv6 address calculator + +(c) Konrad Rosenbaum, 2009 +this program is protected under the GNU GPLv3 or at your option any newer + +This program is designed to calculate and merge IPv6 addresses + +Building +--------- + +Simply call make in this directory or compile ip6calc.c with a compiler +of your choice. It should work on almost any POSIX compliant system. + +Requirements: ANSI-C, GNU getopt + +Using IP6Calc +--------------- + +Usage: ./ip6calc [options] address/mask... + +Address parameters: + 2001:db8::1/64 - address and mask in standard IPv6 notation + 2001:db8::1 - same address, mask is assumed to be /128 + /64 - keeps the currently calculated address, but changes the netmask + mac:00-11-22-33-44-55 - the mac will be translated into a link local + address fe80::211:22ff:fe33:4455/64 + mac:00-11-22-33-44-55/128 - same translation, but explicit netmask + if multiple addresses are given the program attempts to merge them + +Output options: + -h | --help + displays this help text and exit + -s | --short + print short IPv6 output (eg. 2001:db8::1/128) - this is the default + -d | --detail + print detailed IPv6 output (eg. 2001:db8:0:0:0:0:0:1/128) + -f | --full + print full IPv6 output (eg. 2001:0db8:0000:0000:0000:0000:0000:0001) + -n | --netid + print the network ID + -H | --hostid + print the host ID + -m | --mask + print the network mask of the last component + -M | --mac + attempt to extract a MAC address from the resulting host ID + +Examples: + ./ip6calc 2001:db8::1/64 + -> 2001:db8::/64 + ./ip6calc 2001:db8::1/64 fe80::211:22ff:fe33:4455 + -> 2001:db8::211:22ff:fe33:4455/128 + ./ip6calc 2001:db8::1/64 fe80::211:22ff:fe33:4455 /64 + -> 2001:db8::211:22ff:fe33:4455/64 + ./ip6calc --netid 2001:db8::211:22ff:fe33:4455/64 + -> 2001:db8:: + ./ip6calc --hostid 2001:db8::211:22ff:fe33:4455/64 + -> ::211:22ff:fe33:4455 + ./ip6calc --mask 2001:db8::211:22ff:fe33:4455/64 + -> /64 + ./ip6calc --netid --hostid --mask 2001:db8::211:22ff:fe33:4455/64 + -> 2001:db8::211:22ff:fe33:4455/64 + ./ip6calc 2001:db8::211:22ff:fe33:4455/64 + -> 2001:db8::211:22ff:fe33:4455/64 + ./ip6calc --mac 2001:db8::211:22ff:fe33:4455 + -> MAC=00-11-22-33-44-55 + +Known Bugs +----------- + +The program currently does not understand IPv4-mapped addresses in the form +::1.2.3.4 diff --git a/ip6calc.c b/ip6calc.c new file mode 100644 index 0000000..734e7ef --- /dev/null +++ b/ip6calc.c @@ -0,0 +1,440 @@ +/* +* C Implementation: ip6calc +* +* Description: a simple tool to calculate IPv6 addresses +* +* +* Author: Konrad Rosenbaum , (C) 2009 +* +* Copyright: See COPYING file that comes with this distribution +* +*/ + +#include +#include +#include +#include + + +#define FMT_SHORT 0 +#define FMT_DETAIL 1 +#define FMT_FULL 2 + +#define OUT_NET 1 +#define OUT_HOST 2 +#define OUT_MASK 4 +#define OUT_MAC 8 + +#define OUT_IPM 7 +#define OUT_IP 3 +#define OUT_UNTOUCH 0x8000 +#define OUT_INIT 0x8007 + + +char shortopt[]="hsdfnHmM"; +struct option longopt[]= { + {"short",0,0,'s'}, + {"detail",0,0,'d'}, + {"full",0,0,'f'}, + {"netid",0,0,'n'}, + {"hostid",0,0,'H'}, + {"mask",0,0,'m'}, + {"mac",0,0,'M'}, + {"help",0,0,'h'}, + {0,0,0,0} +}; + +#define HELP \ + "Usage: %1$s [options] address/mask...\n" \ + "IPv6 calculator\n"\ + "(c) Konrad Rosenbaum, 2009\n"\ + "this program is protected under the GNU GPLv3 or at your option any newer\n"\ + "\n"\ + "Address parameters:\n"\ + " 2001:db8::1/64 - address and mask in standard IPv6 notation\n" \ + " 2001:db8::1 - same address, mask is assumed to be /128\n" \ + " /64 - keeps the currently calculated address, but changes the netmask\n"\ + " mac:00-11-22-33-44-55 - the mac will be translated into a link local\n"\ + " address fe80::211:22ff:fe33:4455/64\n"\ + " mac:00-11-22-33-44-55/128 - same translation, but explicit netmask\n"\ + " if multiple addresses are given the program attempts to merge them\n"\ + "\n"\ + "Output options:\n" \ + " -h | --help\n" \ + " displays this help text and exit\n" \ + \ + " -s | --short\n" \ + " print short IPv6 output (eg. 2001:db8::1/128) - this is the default\n"\ + \ + " -d | --detail\n" \ + " print detailed IPv6 output (eg. 2001:db8:0:0:0:0:0:1/128)\n"\ + \ + " -f | --full\n" \ + " print full IPv6 output (eg. 2001:0db8:0000:0000:0000:0000:0000:0001)\n"\ + \ + " -n | --netid\n" \ + " print the network ID\n"\ + \ + " -H | --hostid\n" \ + " print the host ID\n"\ + \ + " -m | --mask\n"\ + " print the network mask of the last component\n"\ + \ + " -M | --mac\n"\ + " attempt to extract a MAC address from the resulting host ID\n"\ + "\n"\ + "Examples:\n"\ + " %1$s 2001:db8::1/64\n -> 2001:db8::/64\n"\ + " %1$s 2001:db8::1/64 fe80::211:22ff:fe33:4455\n -> 2001:db8::211:22ff:fe33:4455/128\n"\ + " %1$s 2001:db8::1/64 fe80::211:22ff:fe33:4455 /64\n -> 2001:db8::211:22ff:fe33:4455/64\n"\ + " %1$s --netid 2001:db8::211:22ff:fe33:4455/64\n -> 2001:db8::\n"\ + " %1$s --hostid 2001:db8::211:22ff:fe33:4455/64\n -> ::211:22ff:fe33:4455\n"\ + " %1$s --mask 2001:db8::211:22ff:fe33:4455/64\n -> /64\n"\ + " %1$s --netid --hostid --mask 2001:db8::211:22ff:fe33:4455/64\n -> 2001:db8::211:22ff:fe33:4455/64\n"\ + " %1$s 2001:db8::211:22ff:fe33:4455/64\n -> 2001:db8::211:22ff:fe33:4455/64\n"\ + " %1$s --mac 2001:db8::211:22ff:fe33:4455\n -> MAC=00-11-22-33-44-55\n" + +int format=FMT_SHORT,outputs=OUT_INIT; + +void setoutput(int o) +{ + if(outputs&OUT_UNTOUCH)outputs=0; + outputs|=o; +} + +typedef unsigned short ip6addr[8]; +ip6addr caddr={0,0,0,0, 0,0,0,0}; +short cmask=0; + +void printmac() +{ + if((outputs&OUT_MAC)==0)return; + if((caddr[5]&0xff)==0xff && (caddr[6]&0xff00)==0xfe00){ + printf("MAC=%02x-%02x-%02x-%02x-%02x-%02x\n", + (caddr[4]>>8)^0x02, + caddr[4]&0xff, + caddr[5]>>8, + caddr[6]&0xff, + caddr[7]>>8, + caddr[7]&0xff + ); + }else{ + fprintf(stderr,"Result does not contain a MAC address.\n"); + exit(1); + } +} + +void printdetail() +{ + if(format==FMT_FULL) + printf("%04hx:%04hx:%04hx:%04hx:%04hx:%04hx:%04hx:%04hx", caddr[0], caddr[1], caddr[2], caddr[3], caddr[4], caddr[5], caddr[6], caddr[7]); + else + printf("%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", caddr[0], caddr[1], caddr[2], caddr[3], caddr[4], caddr[5], caddr[6], caddr[7]); +} + +void printshort() +{ + int zs=-1,zl=0,mzs=-1,mzl=0,i; + /*shortcut: is it all zero?*/ + if(!caddr[0] && !caddr[1] && !caddr[2] && !caddr[3] && !caddr[4] && !caddr[5] && !caddr[6] && !caddr[7]){ + printf("::"); + return; + } + /*find longest stretch of zeroes*/ + for(i=0;i<7;i++){ + if(caddr[i]){ + /*check for maximum*/ + if(zl>mzl){ + mzl=zl; + mzs=zs; + } + /*reset*/ + zl=0;zs=-1; + }else{ + /*if a zero and previous not, remember pos*/ + if(!zl)zs=i; + /*increase length*/ + zl++; + } + } + /*check again*/ + if(zl>mzl){mzl=zl;mzs=zs;} + /*print*/ + if(mzs<0 || mzl<2){ + printdetail(); + return; + } + for(i=0;i=7)return; + printf("::"); + for(i=mzs+mzl;i<8;i++){ + printf("%hx",caddr[i]); + if(i<7)printf(":"); + } +} + +void printaddr() +{ + int m,i; + ip6addr ip; + if((outputs&OUT_IPM)==0)return; + /*print address*/ + if(outputs&OUT_IP){ + /*null out unwanted parts*/ + if((outputs&OUT_IP)!=OUT_IP){ + memcpy(ip,caddr,sizeof(ip)); + m=cmask; + for(i=0;i<8;i++){ + if(m>=16)ip[i]=0;else + if(m<=0)caddr[i]=0; + else switch(m){ + case 1:caddr[i]&=0x8000;ip[i]&=0x7fff;break; + case 2:caddr[i]&=0xc000;ip[i]&=0x3fff;break; + case 3:caddr[i]&=0xe000;ip[i]&=0x1fff;break; + case 4:caddr[i]&=0xf000;ip[i]&=0x0fff;break; + + case 5:caddr[i]&=0xf800;ip[i]&=0x07ff;break; + case 6:caddr[i]&=0xfc00;ip[i]&=0x03ff;break; + case 7:caddr[i]&=0xfe00;ip[i]&=0x01ff;break; + case 8:caddr[i]&=0xff00;ip[i]&=0x00ff;break; + + case 9:caddr[i]&=0xff80;ip[i]&=0x007f;break; + case 10:caddr[i]&=0xffc0;ip[i]&=0x003f;break; + case 11:caddr[i]&=0xffe0;ip[i]&=0x001f;break; + case 12:caddr[i]&=0xfff0;ip[i]&=0x000f;break; + + case 13:caddr[i]&=0xfff8;ip[i]&=0x0007;break; + case 14:caddr[i]&=0xfffc;ip[i]&=0x0003;break; + case 15:caddr[i]&=0xfffe;ip[i]&=0x0001;break; + } + m-=16; + } + if((outputs&OUT_IP)==OUT_HOST) + memcpy(caddr,ip,sizeof(ip)); + } + /*actually print*/ + if(format==FMT_SHORT) + printshort(); + else + printdetail(); + } + /*print mask*/ + if(outputs&OUT_MASK)printf("/%hi",cmask); + /*newline*/ + printf("\n"); +} + +void mergeaddr(ip6addr ip,int mask) +{ + int i,m; + /*stage 2: abbrev addrs*/ + m=cmask; + for(i=0;i<8;i++){ + if(m>=16)ip[i]=0;else + if(m<=0)caddr[i]=0; + else switch(m){ + case 1:caddr[i]&=0x8000;ip[i]&=0x7fff;break; + case 2:caddr[i]&=0xc000;ip[i]&=0x3fff;break; + case 3:caddr[i]&=0xe000;ip[i]&=0x1fff;break; + case 4:caddr[i]&=0xf000;ip[i]&=0x0fff;break; + + case 5:caddr[i]&=0xf800;ip[i]&=0x07ff;break; + case 6:caddr[i]&=0xfc00;ip[i]&=0x03ff;break; + case 7:caddr[i]&=0xfe00;ip[i]&=0x01ff;break; + case 8:caddr[i]&=0xff00;ip[i]&=0x00ff;break; + + case 9:caddr[i]&=0xff80;ip[i]&=0x007f;break; + case 10:caddr[i]&=0xffc0;ip[i]&=0x003f;break; + case 11:caddr[i]&=0xffe0;ip[i]&=0x001f;break; + case 12:caddr[i]&=0xfff0;ip[i]&=0x000f;break; + + case 13:caddr[i]&=0xfff8;ip[i]&=0x0007;break; + case 14:caddr[i]&=0xfffc;ip[i]&=0x0003;break; + case 15:caddr[i]&=0xfffe;ip[i]&=0x0001;break; + } + m-=16; + } + /*stage 3: merge*/ + for(i=0;i<8;i++) + caddr[i]^=ip[i]; + cmask=mask; +} + +void parsemac(const char*a) +{ + int i; + ip6addr ip={0xfe80,0,0,0, 0,0,0,0}; + unsigned char mac[6]={0,0,0, 0,0,0}; + const char*s=a+4; + /*parse*/ + if(strlen(s)!=17){ + fprintf(stderr,"address %s is not a valid MAC: must be 12 '-' or ':' separated hex digits\n",a); + exit(1); + } + for(i=0;i<17;i++){ + if((i%3)==2){ + if(s[i]!='-' && s[i]!=':'){ + fprintf(stderr,"address %s is not a valid MAC: invalid separator\n",a); + exit(1); + } + continue; + } + mac[i/3]<<=4; + if(s[i]>='0' && s[i]<='9')mac[i/3]|=s[i]-'0';else + if(s[i]>='a' && s[i]<='f')mac[i/3]|=s[i]-'a'+10;else + if(s[i]>='A' && s[i]<='F')mac[i/3]|=s[i]-'A'+10; + else{ + fprintf(stderr,"address %s is not a valid MAC: it contains non-hex digits\n",a); + exit(1); + } + } + /*convert*/ + ip[4]=0x200^((mac[0]<<8)|mac[1]); + ip[5]=(mac[2]<<8)|0xff; + ip[6]=0xfe00 | mac[3]; + ip[7]=(mac[4]<<8)|mac[5]; + /*merge*/ + mergeaddr(ip,64); +} + +void parseaddr(const char*a) +{ + int i,j,k,l,mask=128,m,semcnt=0,haddblc=0; + ip6addr ip={0,0,0,0, 0,0,0,0}; + /*stage 0: is it an IP or a MAC?*/ + if(strncmp("mac:",a,4)==0){ + parsemac(a); + return; + } + /*stage 1: parse local addr*/ + if(a[0]==':' && a[1]!=':'){ + fprintf(stderr,"address %s is not valid: it must start with a hex digit or ::\n",a); + exit(1); + } + m=-1; + for(i=j=0;a[i];i++){ + if(j>7){ + fprintf(stderr,"address %s is not valid: more than 8 segments\n",a); + exit(1); + } + if(a[i]=='/')break; + if(a[i]==':'){ + semcnt++; + if(!i)continue; + if(m<0){ + /*its :: */ + if(haddblc){ + fprintf(stderr,"address %s is not valid: only one :: is allowed\n",a); + exit(1); + } + haddblc++; + l=0; + for(k=i+1;a[k];k++)if(a[k]==':')l++; + if((7-l)='0'&&a[i]<='9')m|=a[i]-'0';else + if(a[i]>='a'&&a[i]<='f')m|=a[i]-'a'+10;else + if(a[i]>='A'&&a[i]<='F')m|=a[i]-'A'+10; + else{ + fprintf(stderr,"address %s is not valid: %c is not a hex digit\n",a,a[i]); + exit(1); + } + if(m>0xffff){ + fprintf(stderr,"address %s is not valid: max. 4 hex digits per segment\n",a); + exit(1); + } + } + } + /*sanity checks*/ + if(i){ + if(semcnt<2 || semcnt>7){ + fprintf(stderr,"address %s is not valid: not enough or too many segments\n",a); + exit(1); + } + if(i>2) + if(a[i-1]==':'&&a[i-2]!=':'){ + fprintf(stderr,"address %s is not valid: it must not end with a single :\n",a); + exit(1); + } + if(j!=7){ + fprintf(stderr,"address %s is not valid: wrong number of segments\n",a); + exit(1); + } + if(m>=0)ip[j]=m; + } + if(a[i]=='/'){ + /*parse mask*/ + char*p; + i++; + if(a[i]==0){ + fprintf(stderr,"invalid mask: must contain a decimal number 0<=mask<=128\n"); + exit(1); + } + mask=strtol(a+i,&p,10); + if(*p!=0){ + fprintf(stderr,"invalid mask: not a decimal number\n"); + exit(1); + } + if(mask<0 || mask>128){ + fprintf(stderr,"invalid mask: must be between 0 and 128\n"); + exit(1); + } + } + /*stage 1.5: if it is just a mask: skip stage 2*/ + if(a[0]=='/'){ + cmask=mask; + return; + } + /*stage 2: merge*/ + mergeaddr(ip,mask); +} + +int main(int argc,char**argv) +{ + int c,optindex=1; + /*parse options*/ + while(1){ + c=getopt_long(argc,argv,shortopt,longopt,&optindex); + if(c==-1)break; + switch(c){ + case 's':format=FMT_SHORT;break; + case 'd':format=FMT_DETAIL;break; + case 'f':format=FMT_FULL;break; + case 'n':setoutput(OUT_NET);break; + case 'H':setoutput(OUT_HOST);break; + case 'm':setoutput(OUT_MASK);break; + case 'M':setoutput(OUT_MAC);break; + default: + fprintf(stderr,"Syntax error in arguments.\n"); + fprintf(stderr,HELP,argv[0]); + return 1; + break; + case 'h': + fprintf(stderr,HELP,argv[0]); + return 0; + break; + } + } + /*parse addresses*/ + while(optind