X-Git-Url: https://git.tld-linux.org/?a=blobdiff_plain;f=src%2Fipcalc.c;fp=src%2Fipcalc.c;h=0000000000000000000000000000000000000000;hb=6c34c3958eb396b515524ec25d2e1b0c61a99ab6;hp=f133412ccf4670daf6a5bea8e4ded39dd7e0a3ad;hpb=196499bef27e2a6e7b4f321ed9886f550550044c;p=rc-scripts.git diff --git a/src/ipcalc.c b/src/ipcalc.c deleted file mode 100644 index f133412..0000000 --- a/src/ipcalc.c +++ /dev/null @@ -1,361 +0,0 @@ -/* - * Copyright (c) 1997-2003 Red Hat, Inc. All rights reserved. - * - * This software may be freely redistributed under the terms of the GNU - * public license. - * - * 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. - * - * Authors: - * Erik Troan - * Preston Brown - */ - - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -/*! - \def IPBITS - \brief the number of bits in an IP address. -*/ -#define IPBITS (sizeof(u_int32_t) * 8) -/*! - \def IPBYTES - \brief the number of bytes in an IP address. -*/ -#define IPBYTES (sizeof(u_int32_t)) - - -/*! - \file ipcalc.c - \brief provides utilities for manipulating IP addresses. - - ipcalc provides utilities and a front-end command line interface for - manipulating IP addresses, and calculating various aspects of an ip - address/netmask/network address/prefix/etc. - - Functionality can be accessed from other languages from the library - interface, documented here. To use ipcalc from the shell, read the - ipcalc(1) manual page. - - When passing parameters to the various functions, take note of whether they - take host byte order or network byte order. Most take host byte order, and - return host byte order, but there are some exceptions. - -*/ - -/*! - \fn u_int32_t prefix2mask(int bits) - \brief creates a netmask from a specified number of bits - - This function converts a prefix length to a netmask. As CIDR (classless - internet domain internet domain routing) has taken off, more an more IP - addresses are being specified in the format address/prefix - (i.e. 192.168.2.3/24, with a corresponding netmask 255.255.255.0). If you - need to see what netmask corresponds to the prefix part of the address, this - is the function. See also \ref mask2prefix. - - \param prefix is the number of bits to create a mask for. - \return a network mask, in network byte order. -*/ -u_int32_t prefix2mask(int prefix) { - return htonl(~((1 << (32 - prefix)) - 1)); -} - -/*! - \fn int mask2prefix(u_int32_t mask) - \brief calculates the number of bits masked off by a netmask. - - This function calculates the significant bits in an IP address as specified by - a netmask. See also \ref prefix2mask. - - \param mask is the netmask, specified as an u_int32_teger in network byte order. - \return the number of significant bits. */ -int mask2prefix(u_int32_t mask) -{ - int i; - int count = IPBITS; - - for (i = 0; i < IPBITS; i++) { - if (!(ntohl(mask) & ((2 << i) - 1))) - count--; - } - - return count; -} - -/*! - \fn u_int32_t default_netmask(u_int32_t addr) - - \brief returns the default (canonical) netmask associated with specified IP - address. - - When the Internet was originally set up, various ranges of IP addresses were - segmented into three network classes: A, B, and C. This function will return - a netmask that is associated with the IP address specified defining where it - falls in the predefined classes. - - \param addr an IP address in network byte order. - \return a netmask in network byte order. */ -u_int32_t default_netmask(u_int32_t addr) -{ - if (((ntohl(addr) & 0xFF000000) >> 24) <= 127) - return htonl(0xFF000000); - else if (((ntohl(addr) & 0xFF000000) >> 24) <= 191) - return htonl(0xFFFF0000); - else - return htonl(0xFFFFFF00); -} - -/*! - \fn u_int32_t calc_broadcast(u_int32_t addr, int prefix) - - \brief calculate broadcast address given an IP address and a prefix length. - - \param addr an IP address in network byte order. - \param prefix a prefix length. - - \return the calculated broadcast address for the network, in network byte - order. -*/ -u_int32_t calc_broadcast(u_int32_t addr, - int prefix) -{ - return (addr & prefix2mask(prefix)) | ~prefix2mask(prefix); -} - -/*! - \fn u_int32_t calc_network(u_int32_t addr, int prefix) - \brief calculates the network address for a specified address and prefix. - - \param addr an IP address, in network byte order - \param prefix the network prefix - \return the base address of the network that addr is associated with, in - network byte order. -*/ -u_int32_t calc_network(u_int32_t addr, int prefix) -{ - return (addr & prefix2mask(prefix)); -} - -/*! - \fn const char *get_hostname(u_int32_t addr) - \brief returns the hostname associated with the specified IP address - - \param addr an IP address to find a hostname for, in network byte order - - \return a hostname, or NULL if one cannot be determined. Hostname is stored - in a static buffer that may disappear at any time, the caller should copy the - data if it needs permanent storage. -*/ -const char *get_hostname(u_int32_t addr) -{ - struct hostent * hostinfo; - int x; - - hostinfo = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET); - if (!hostinfo) - return NULL; - - for (x=0; hostinfo->h_name[x]; x++) { - hostinfo->h_name[x] = tolower(hostinfo->h_name[x]); - } - return hostinfo->h_name; -} - -/*! - \fn main(int argc, const char **argv) - \brief wrapper program for ipcalc functions. - - This is a wrapper program for the functions that the ipcalc library provides. - It can be used from shell scripts or directly from the command line. - - For more information, please see the ipcalc(1) man page. -*/ -int main(int argc, const char **argv) { - int showBroadcast = 0, showPrefix = 0, showNetwork = 0; - int showHostname = 0, showNetmask = 0; - int beSilent = 0; - int rc; - poptContext optCon; - char *ipStr, *prefixStr, *netmaskStr, *hostName, *chptr; - struct in_addr ip, netmask, network, broadcast; - int prefix = 0; - char errBuf[250]; - struct poptOption optionsTable[] = { - { "broadcast", 'b', 0, &showBroadcast, 0, - "Display calculated broadcast address", }, - { "hostname", 'h', 0, &showHostname, 0, - "Show hostname determined via DNS" }, - { "netmask", 'm', 0, &showNetmask, 0, - "Display default netmask for IP (class A, B, or C)" }, - { "network", 'n', 0, &showNetwork, 0, - "Display network address", }, - { "prefix", 'p', 0, &showPrefix, 0, - "Display network prefix", }, - { "silent", 's', 0, &beSilent, 0, - "Don't ever display error messages " }, - POPT_AUTOHELP - { NULL, '\0', 0, 0, 0, NULL, NULL } - }; - - optCon = poptGetContext("ipcalc", argc, argv, optionsTable, 0); - poptReadDefaultConfig(optCon, 1); - - if ((rc = poptGetNextOpt(optCon)) < -1) { - if (!beSilent) { - fprintf(stderr, "ipcalc: bad argument %s: %s\n", - poptBadOption(optCon, POPT_BADOPTION_NOALIAS), - poptStrerror(rc)); - poptPrintHelp(optCon, stderr, 0); - } - return 1; - } - - if (!(ipStr = (char *) poptGetArg(optCon))) { - if (!beSilent) { - fprintf(stderr, "ipcalc: ip address expected\n"); - poptPrintHelp(optCon, stderr, 0); - } - return 1; - } - - if (strchr(ipStr,'/') != NULL) { - prefixStr = strchr(ipStr, '/') + 1; - prefixStr--; - *prefixStr = '\0'; /* fix up ipStr */ - prefixStr++; - } else - prefixStr = NULL; - - if (prefixStr != NULL) { - prefix = atoi(prefixStr); - if (prefix == 0) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad prefix: %s\n", - prefixStr); - return 1; - } - } - - if (showBroadcast || showNetwork || showPrefix) { - if (!(netmaskStr = (char *) poptGetArg(optCon)) && - (prefix == 0)) { - if (!beSilent) { - fprintf(stderr, "ipcalc: netmask or prefix expected\n"); - poptPrintHelp(optCon, stderr, 0); - } - return 1; - } else if (netmaskStr && prefix != 0) { - if (!beSilent) { - fprintf(stderr, "ipcalc: both netmask and prefix specified\n"); - poptPrintHelp(optCon, stderr, 0); - } - return 1; - } else if (netmaskStr) { - if (!inet_aton(netmaskStr, &netmask)) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad netmask: %s\n", - netmaskStr); - return 1; - } - prefix = mask2prefix(netmask.s_addr); - } - } - - if ((chptr = (char *) poptGetArg(optCon))) { - if (!beSilent) { - fprintf(stderr, "ipcalc: unexpected argument: %s\n", chptr); - poptPrintHelp(optCon, stderr, 0); - } - return 1; - } - - /* Handle CIDR entries such as 172/8 */ - if (prefix) { - char *tmp = ipStr; - int i; - - for(i=3; i> 0; i--) { - tmp = strchr(tmp,'.'); - if (!tmp) - break; - else - tmp++; - } - tmp = NULL; - for (; i>0; i--) { - tmp = malloc(strlen(ipStr) + 3); - sprintf(tmp,"%s.0",ipStr); - ipStr = tmp; - } - } - - if (!inet_aton(ipStr, (struct in_addr *) &ip)) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad ip address: %s\n", ipStr); - return 1; - } - - - if (!(showNetmask|showPrefix|showBroadcast|showNetwork|showHostname)) { - poptPrintHelp(optCon, stderr, 0); - return 1; - } - - poptFreeContext(optCon); - - /* we know what we want to display now, so display it. */ - - if (showNetmask) { - if (prefix) { - netmask.s_addr = prefix2mask(prefix); - } else { - netmask.s_addr = default_netmask(ip.s_addr); - prefix = mask2prefix(netmask.s_addr); - } - - printf("NETMASK=%s\n", inet_ntoa(netmask)); - } - - if (showPrefix) { - if (!prefix) - prefix = mask2prefix(ip.s_addr); - printf("PREFIX=%d\n", prefix); - } - - if (showBroadcast) { - broadcast.s_addr = calc_broadcast(ip.s_addr, prefix); - printf("BROADCAST=%s\n", inet_ntoa(broadcast)); - } - - if (showNetwork) { - network.s_addr = calc_network(ip.s_addr, prefix); - printf("NETWORK=%s\n", inet_ntoa(network)); - } - - if (showHostname) { - if ((hostName = (char *) get_hostname(ip.s_addr)) == NULL) { - if (!beSilent) { - sprintf(errBuf, "ipcalc: cannot find hostname for %s", ipStr); - herror(errBuf); - } - return 1; - } - - printf("HOSTNAME=%s\n", hostName); - } - - return 0; -}