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Set of new network related utilities
* src/util/network.h src/util/network.c: utilities to parse network addresses, check netmask and compute ranges
This commit is contained in:
Daniel Veillard
parent
d5fcd4f7a3
commit
24c8fc5dff
@ -55,6 +55,7 @@ UTIL_SOURCES = \
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util/memory.c util/memory.h \
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util/pci.c util/pci.h \
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util/hostusb.c util/hostusb.h \
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util/network.c util/network.h \
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util/qparams.c util/qparams.h \
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util/stats_linux.c util/stats_linux.h \
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util/storage_file.c util/storage_file.h \
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323
src/util/network.c
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323
src/util/network.c
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@ -0,0 +1,323 @@
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/*
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* network.c: network helper APIs for libvirt
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*
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* Copyright (C) 2009-2009 Red Hat, Inc.
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*
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* See COPYING.LIB for the License of this software
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*
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* Daniel Veillard <veillard@redhat.com>
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*/
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#include <config.h>
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#include "memory.h"
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#include "network.h"
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/*
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* Helpers to extract the IP arrays from the virSocketAddrPtr
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* That part is the less portable of the module
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*/
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typedef unsigned char virIPv4Addr[4];
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typedef virIPv4Addr *virIPv4AddrPtr;
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typedef unsigned short virIPv6Addr[8];
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typedef virIPv6Addr *virIPv6AddrPtr;
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static int getIPv4Addr(virSocketAddrPtr addr, virIPv4AddrPtr tab) {
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unsigned long val;
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int i;
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if ((addr == NULL) || (tab == NULL) || (addr->stor.ss_family != AF_INET))
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return(-1);
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val = ntohl(addr->inet4.sin_addr.s_addr);
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for (i = 0;i < 4;i++) {
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(*tab)[i] = val & 0xFF;
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val >>= 8;
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}
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return(0);
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}
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static int getIPv6Addr(virSocketAddrPtr addr, virIPv6AddrPtr tab) {
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virIPv6AddrPtr val;
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int i;
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if ((addr == NULL) || (tab == NULL) || (addr->stor.ss_family != AF_INET6))
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return(-1);
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val = (virIPv6AddrPtr) &(addr->inet6.sin6_addr.__in6_u.__u6_addr16);
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for (i = 0;i < 8;i++) {
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(*tab)[i] = ntohs((*val)[i]);
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}
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return(0);
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}
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/**
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* virSocketParseAddr:
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* @val: a numeric network address IPv4 or IPv6
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* @addr: where to store the return value.
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* @hint: optional hint to pass down to getaddrinfo
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*
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* Mostly a wrapper for getaddrinfo() extracting the address storage
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* from the numeric string like 1.2.3.4 or 2001:db8:85a3:0:0:8a2e:370:7334
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*
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* Returns the lenght of the network address or -1 in case of error.
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*/
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int
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virSocketParseAddr(const char *val, virSocketAddrPtr addr, int hint) {
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int len;
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struct addrinfo hints;
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struct addrinfo *res = NULL;
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if ((val == NULL) || (addr == NULL))
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return(-1);
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_NUMERICHOST | hint;
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if ((getaddrinfo(val, NULL, &hints, &res) != 0) || (res == NULL)) {
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return(-1);
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}
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len = res->ai_addrlen;
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memcpy(&addr->stor, res->ai_addr, len);
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freeaddrinfo(res);
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return(len);
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}
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/*
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* virSocketParseIpv4Addr:
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* @val: an IPv4 numeric address
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* @addr: the loacation to store the result
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*
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* Extract the address storage from an IPv4 numeric address
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*
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* Returns the lenght of the network address or -1 in case of error.
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*/
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int
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virSocketParseIpv4Addr(const char *val, virSocketAddrPtr addr) {
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return(virSocketParseAddr(val, addr, AF_INET));
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}
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/*
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* virSocketParseIpv6Addr:
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* @val: an IPv6 numeric address
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* @addr: the loacation to store the result
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*
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* Extract the address storage from an IPv6 numeric address
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*
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* Returns the lenght of the network address or -1 in case of error.
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*/
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int
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virSocketParseIpv6Addr(const char *val, virSocketAddrPtr addr) {
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return(virSocketParseAddr(val, addr, AF_INET6));
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}
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/**
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* virSocketAddrIsNetmask:
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* @netmask: the netmask address
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*
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* Check that @netmask is a proper network mask
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*
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* Returns 0 in case of success and -1 in case of error
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*/
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int virSocketAddrIsNetmask(virSocketAddrPtr netmask) {
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int i;
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if (netmask == NULL)
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return(-1);
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if (netmask->stor.ss_family == AF_INET) {
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virIPv4Addr tm;
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unsigned char tmp;
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int ok = 0;
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if (getIPv4Addr(netmask, &tm) < 0)
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return(-1);
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for (i = 0;i < 4;i++) {
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if (tm[i] != 0)
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break;
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}
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if (i >= 4)
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return(0);
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tmp = 0xFF;
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do {
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if (tm[i] == tmp) {
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ok = 1;
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break;
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}
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tmp <<= 1;
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} while (tmp != 0);
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if (ok == 0)
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return(-1);
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i++;
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if (i >= 4)
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return(0);
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for (;i < 4;i++) {
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if (tm[i] != 0xFF)
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return(-1);
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}
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} else if (netmask->stor.ss_family == AF_INET6) {
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virIPv6Addr tm;
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unsigned short tmp;
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int ok = 0;
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/*
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* Hum, on IPv6 people use prefixes instead of netmask
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*/
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if (getIPv6Addr(netmask, &tm) < 0)
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return(-1);
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for (i = 0;i < 8;i++) {
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if (tm[i] != 0)
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break;
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}
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if (i >= 8)
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return(0);
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tmp = 0xFFFF;
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do {
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if (tm[i] == tmp) {
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ok = 1;
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break;
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}
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tmp <<= 1;
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} while (tmp != 0);
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if (ok == 0)
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return(-1);
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i++;
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if (i >= 8)
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return(0);
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for (;i < 8;i++) {
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if (tm[i] != 0xFFFF)
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return(-1);
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}
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} else {
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return(-1);
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}
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return(0);
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}
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/**
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* virSocketCheckNetmask:
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* @addr1: a first network address
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* @addr2: a second network address
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* @netmask: the netmask address
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*
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* Check that @addr1 and @addr2 pertain to the same @netmask address
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* range and returns the size of the range
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*
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* Returns 1 in case of success and 0 in case of failure and
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* -1 in case of error
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*/
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int virSocketCheckNetmask(virSocketAddrPtr addr1, virSocketAddrPtr addr2,
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virSocketAddrPtr netmask) {
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int i;
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if ((addr1 == NULL) || (addr2 == NULL) || (netmask == NULL))
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return(-1);
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if ((addr1->stor.ss_family != addr2->stor.ss_family) ||
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(addr1->stor.ss_family != netmask->stor.ss_family))
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return(-1);
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if (virSocketAddrIsNetmask(netmask) != 0)
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return(-1);
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if (addr1->stor.ss_family == AF_INET) {
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virIPv4Addr t1, t2, tm;
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if ((getIPv4Addr(addr1, &t1) < 0) ||
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(getIPv4Addr(addr2, &t2) < 0) ||
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(getIPv4Addr(netmask, &tm) < 0))
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return(-1);
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for (i = 0;i < 4;i++) {
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if ((t1[i] & tm[i]) != (t2[i] & tm[i]))
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return(0);
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}
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} else if (addr1->stor.ss_family == AF_INET) {
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virIPv6Addr t1, t2, tm;
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if ((getIPv6Addr(addr1, &t1) < 0) ||
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(getIPv6Addr(addr2, &t2) < 0) ||
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(getIPv6Addr(netmask, &tm) < 0))
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return(-1);
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for (i = 0;i < 8;i++) {
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if ((t1[i] & tm[i]) != (t2[i] & tm[i]))
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return(0);
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}
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} else {
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return(-1);
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}
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return(1);
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}
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/**
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* virSocketGetRange:
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* @start: start of an IP range
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* @end: end of an IP range
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*
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* Check the order of the 2 addresses and compute the range, this
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* will return 1 for identical addresses. Errors can come from incompatible
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* addresses type, excessive range (>= 2^^16) where the two addresses are
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* unrelated or inverted start and end.
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*
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* Returns the size of the range or -1 in case of failure
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*/
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int virSocketGetRange(virSocketAddrPtr start, virSocketAddrPtr end) {
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int ret = 0, i;
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if ((start == NULL) || (end == NULL))
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return(-1);
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if (start->stor.ss_family != end->stor.ss_family)
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return(-1);
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if (start->stor.ss_family == AF_INET) {
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virIPv4Addr t1, t2;
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if ((getIPv4Addr(start, &t1) < 0) ||
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(getIPv4Addr(end, &t2) < 0))
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return(-1);
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for (i = 0;i < 2;i++) {
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if (t1[i] != t2[i])
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return(-1);
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}
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ret = (t2[2] - t1[2]) * 256 + (t2[3] - t1[3]);
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if (ret < 0)
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return(-1);
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ret++;
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} else if (start->stor.ss_family == AF_INET6) {
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virIPv6Addr t1, t2;
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if ((getIPv6Addr(start, &t1) < 0) ||
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(getIPv6Addr(end, &t2) < 0))
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return(-1);
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for (i = 0;i < 7;i++) {
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if (t1[i] != t2[i])
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return(-1);
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}
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ret = t2[7] - t1[7];
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if (ret < 0)
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return(-1);
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ret++;
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} else {
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return(-1);
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}
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return(ret);
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}
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49
src/util/network.h
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49
src/util/network.h
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@ -0,0 +1,49 @@
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/*
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* network.h: network helper APIs for libvirt
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*
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* Copyright (C) 2009-2009 Red Hat, Inc.
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*
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* See COPYING.LIB for the License of this software
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*
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* Daniel Veillard <veillard@redhat.com>
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*/
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#ifndef __VIR_NETWORK_H__
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#define __VIR_NETWORK_H__
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#include "internal.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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typedef union {
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struct sockaddr_storage stor;
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struct sockaddr_in inet4;
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struct sockaddr_in6 inet6;
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} virSocketAddr;
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typedef virSocketAddr *virSocketAddrPtr;
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int virSocketParseAddr (const char *val,
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virSocketAddrPtr addr,
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int hint);
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int virSocketParseIpv4Addr(const char *val,
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virSocketAddrPtr addr);
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int virSocketParseIpv6Addr(const char *val,
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virSocketAddrPtr addr);
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int virSocketAddrInNetwork(virSocketAddrPtr addr1,
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virSocketAddrPtr addr2,
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virSocketAddrPtr netmask);
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int virSocketGetRange (virSocketAddrPtr start,
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virSocketAddrPtr end);
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int virSocketAddrIsNetmask(virSocketAddrPtr netmask);
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int virSocketCheckNetmask (virSocketAddrPtr addr1,
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virSocketAddrPtr addr2,
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virSocketAddrPtr netmask);
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#endif /* __VIR_NETWORK_H__ */
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