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author | Lukas Nykryn <lnykryn@redhat.com> | 2015-05-18 14:57:15 +0200 |
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committer | Lukas Nykryn <lnykryn@redhat.com> | 2015-05-18 14:58:15 +0200 |
commit | 76201baf7a731c936e57369549dd537bfcd6a191 (patch) | |
tree | 3dc5e960eab4bf69e3a94d04306909dd75976aa1 /src/ipcalc.c | |
parent | 47474716189b5f4375b7ffd7d65a9b6162c5ce72 (diff) | |
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remove ipcalc, it has its own package now
new upstream:
https://github.com/nmav/ipcalc
Diffstat (limited to 'src/ipcalc.c')
-rw-r--r-- | src/ipcalc.c | 501 |
1 files changed, 0 insertions, 501 deletions
diff --git a/src/ipcalc.c b/src/ipcalc.c deleted file mode 100644 index 9108e4c2..00000000 --- a/src/ipcalc.c +++ /dev/null @@ -1,501 +0,0 @@ -/* - * Copyright (c) 1997-2009 Red Hat, Inc. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2, - * as published by the Free Software Foundation. - * - * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Authors: - * Erik Troan <ewt@redhat.com> - * Preston Brown <pbrown@redhat.com> - * David Cantrell <dcantrell@redhat.com> - */ - -#include <ctype.h> -#include <popt.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sys/socket.h> -#include <sys/types.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#include <netdb.h> -#include <errno.h> - -/*! - \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. -*/ - -int safe_atoi(const char *s, int *ret_i) { - char *x = NULL; - long l; - - errno = 0; - l = strtol(s, &x, 0); - - if (!x || x == s || *x || errno) - return errno > 0 ? -errno : -EINVAL; - - if ((long) (int) l != l) - return -ERANGE; - - *ret_i = (int) l; - return 0; -} - - -/*! - \fn struct in_addr 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. -*/ -struct in_addr prefix2mask(int prefix) { - struct in_addr mask; - memset(&mask, 0, sizeof(mask)); - if (prefix) { - mask.s_addr = htonl(~((1 << (32 - prefix)) - 1)); - } else { - mask.s_addr = htonl(0); - } - return mask; -} - -/*! - \fn int mask2prefix(struct in_addr 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 struct in_addr in network byte order. - \return the number of significant bits. */ -int mask2prefix(struct in_addr mask) -{ - int count; - uint32_t saddr = ntohl(mask.s_addr); - - for (count=0; saddr > 0; count++) { - saddr=saddr << 1; - } - - return count; -} - -/*! - \fn struct in_addr default_netmask(struct in_addr 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. */ -struct in_addr default_netmask(struct in_addr addr) -{ - uint32_t saddr = addr.s_addr; - struct in_addr mask; - - memset(&mask, 0, sizeof(mask)); - - if (((ntohl(saddr) & 0xFF000000) >> 24) <= 127) - mask.s_addr = htonl(0xFF000000); - else if (((ntohl(saddr) & 0xFF000000) >> 24) <= 191) - mask.s_addr = htonl(0xFFFF0000); - else - mask.s_addr = htonl(0xFFFFFF00); - - return mask; -} - -/*! - \fn struct in_addr calc_broadcast(struct in_addr 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. -*/ -struct in_addr calc_broadcast(struct in_addr addr, int prefix) -{ - struct in_addr mask = prefix2mask(prefix); - struct in_addr broadcast; - - memset(&broadcast, 0, sizeof(broadcast)); - -/* if prefix is set to 31 return 255.255.255.255 (RFC3021) */ - if (mask.s_addr == htonl(0xFFFFFFFE)) - broadcast.s_addr = htonl(0xFFFFFFFF); - else - broadcast.s_addr = (addr.s_addr & mask.s_addr) | ~mask.s_addr; - return broadcast; -} - -/*! - \fn struct in_addr calc_network(struct in_addr 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. -*/ -struct in_addr calc_network(struct in_addr addr, int prefix) -{ - struct in_addr mask = prefix2mask(prefix); - struct in_addr network; - - memset(&network, 0, sizeof(network)); - network.s_addr = addr.s_addr & mask.s_addr; - return network; -} - -/*! - \fn const char *get_hostname(int family, void *addr) - \brief returns the hostname associated with the specified IP address - - \param family the address family, either AF_INET or AF_INET6. - \param addr an IP address to find a hostname for, in network byte order, - should either be a pointer to a struct in_addr or a struct in6_addr. - - \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. -*/ -char *get_hostname(int family, void *addr) -{ - struct hostent * hostinfo = NULL; - int x; - struct in_addr addr4; - struct in6_addr addr6; - - if (family == AF_INET) { - memset(&addr4, 0, sizeof(addr4)); - memcpy(&addr4, addr, sizeof(addr4)); - hostinfo = gethostbyaddr((const void *) &addr4, - sizeof(addr4), family); - } else if (family == AF_INET6) { - memset(&addr6, 0, sizeof(addr6)); - memcpy(&addr6, addr, sizeof(addr6)); - hostinfo = gethostbyaddr((const void *) &addr6, - sizeof(addr6), family); - } - - 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 doCheck = 0, familyIPv4 = 0, familyIPv6 = 0; - int rc; - poptContext optCon; - char *ipStr, *prefixStr, *netmaskStr, *chptr; - char *hostName = NULL; - char namebuf[INET6_ADDRSTRLEN+1]; - struct in_addr ip, netmask, network, broadcast; - struct in6_addr ip6; - int prefix = -1; - char errBuf[250]; - struct poptOption optionsTable[] = { - { "check", 'c', 0, &doCheck, 0, - "Validate IP address for specified address family", }, - { "ipv4", '4', 0, &familyIPv4, 0, - "IPv4 address family (default)", }, - { "ipv6", '6', 0, &familyIPv6, 0, - "IPv6 address family", }, - { "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 there is a : in the address, it is an IPv6 address */ - if (strchr(ipStr,':') != NULL) { - familyIPv6=1; - } - - if (strchr(ipStr,'/') != NULL) { - prefixStr = strchr(ipStr, '/') + 1; - prefixStr--; - *prefixStr = '\0'; /* fix up ipStr */ - prefixStr++; - } else { - prefixStr = NULL; - } - - if (prefixStr != NULL) { - int r = 0; - r = safe_atoi(prefixStr, &prefix); - if (r != 0 || prefix < 0 || ((familyIPv6 && prefix > 128) || (!familyIPv6 && prefix > 32))) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad prefix: %s\n", prefixStr); - return 1; - } - } - - if (showBroadcast || showNetwork || showPrefix || doCheck) { - if (!(netmaskStr = (char *) poptGetArg(optCon)) && (prefix < 0 && !doCheck)) { - 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_pton(AF_INET, netmaskStr, &netmask) <= 0) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad netmask: %s\n", netmaskStr); - return 1; - } - prefix = mask2prefix(netmask); - } - } - - if ((chptr = (char *) poptGetArg(optCon))) { - if (!beSilent) { - fprintf(stderr, "ipcalc: unexpected argument: %s\n", chptr); - poptPrintHelp(optCon, stderr, 0); - } - return 1; - } - - if (!familyIPv4 && !familyIPv6) - familyIPv4 = 1; - - if (familyIPv4 && familyIPv6) { - if (!beSilent) { - fprintf(stderr, "ipcalc: cannot specify both address families\n"); - } - return 1; - } - - /* Handle CIDR entries such as 172/8 */ - if (prefix >= 0 && familyIPv4) { - 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--) { - if (asprintf(&tmp, "%s.0", ipStr) == -1) { - fprintf(stderr, "Memory allocation failure line %d\n", __LINE__); - abort(); - } - ipStr = tmp; - } - } - - if (familyIPv4) { - if (inet_pton(AF_INET, ipStr, &ip) <= 0) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad IPv4 address: %s\n", ipStr); - return 1; - } else if (prefix > 32) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad IPv4 prefix %d\n", prefix); - return 1; - } else { - if (doCheck) - return 0; - } - } - - if (familyIPv6) { - if (inet_pton(AF_INET6, ipStr, &ip6) <= 0) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad IPv6 address: %s\n", ipStr); - return 1; - } else if (prefix > 128) { - if (!beSilent) - fprintf(stderr, "ipcalc: bad IPv6 prefix %d\n", prefix); - return 1; - } else { - if (doCheck) - return 0; - } - } - - if (familyIPv6 && - (showBroadcast || showNetmask || showNetwork || showPrefix)) { - if (!beSilent) { - fprintf(stderr, "ipcalc: unable to show setting for IPv6\n"); - } - return 1; - } - - if (familyIPv4 && - !(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 >= 0) { - netmask = prefix2mask(prefix); - } else { - netmask = default_netmask(ip); - prefix = mask2prefix(netmask); - } - - memset(&namebuf, '\0', sizeof(namebuf)); - - if (inet_ntop(AF_INET, &netmask, namebuf, INET_ADDRSTRLEN) == NULL) { - fprintf(stderr, "Memory allocation failure line %d\n", __LINE__); - abort(); - } - - printf("NETMASK=%s\n", namebuf); - } - - if (showPrefix) { - if (prefix == -1) - prefix = mask2prefix(ip); - printf("PREFIX=%d\n", prefix); - } - - if (showBroadcast) { - broadcast = calc_broadcast(ip, prefix); - memset(&namebuf, '\0', sizeof(namebuf)); - - if (inet_ntop(AF_INET, &broadcast, namebuf, INET_ADDRSTRLEN) == NULL) { - fprintf(stderr, "Memory allocation failure line %d\n", __LINE__); - abort(); - } - - printf("BROADCAST=%s\n", namebuf); - } - - if (showNetwork) { - network = calc_network(ip, prefix); - memset(&namebuf, '\0', sizeof(namebuf)); - - if (inet_ntop(AF_INET, &network, namebuf, INET_ADDRSTRLEN) == NULL) { - fprintf(stderr, "Memory allocation failure line %d\n", __LINE__); - abort(); - } - - printf("NETWORK=%s\n", namebuf); - } - - if (showHostname) { - if (familyIPv4) { - hostName = get_hostname(AF_INET, &ip); - } else if (familyIPv6) { - hostName = get_hostname(AF_INET6, &ip6); - } - - if (hostName == NULL) { - if (!beSilent) { - sprintf(errBuf, "ipcalc: cannot find hostname for %s", ipStr); - herror(errBuf); - } - return 1; - } - - printf("HOSTNAME=%s\n", hostName); - } - - return 0; -} |