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|
/*
* Copyright (C) 2009-2011 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see
* <http://www.gnu.org/licenses/>.
*
* Authors:
* Daniel Veillard <veillard@redhat.com>
* Laine Stump <laine@laine.org>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "virsocketaddr.h"
#include "virterror_internal.h"
#include "util.h"
#include <netdb.h>
#define VIR_FROM_THIS VIR_FROM_NONE
/*
* Helpers to extract the IP arrays from the virSocketAddrPtr
* That part is the less portable of the module
*/
typedef unsigned char virSocketAddrIPv4[4];
typedef virSocketAddrIPv4 *virSocketAddrIPv4Ptr;
typedef unsigned short virSocketAddrIPv6[8];
typedef virSocketAddrIPv6 *virSocketAddrIPv6Ptr;
static int virSocketAddrGetIPv4Addr(virSocketAddrPtr addr, virSocketAddrIPv4Ptr tab) {
unsigned long val;
int i;
if ((addr == NULL) || (tab == NULL) || (addr->data.stor.ss_family != AF_INET))
return -1;
val = ntohl(addr->data.inet4.sin_addr.s_addr);
for (i = 0;i < 4;i++) {
(*tab)[3 - i] = val & 0xFF;
val >>= 8;
}
return 0;
}
static int virSocketAddrGetIPv6Addr(virSocketAddrPtr addr, virSocketAddrIPv6Ptr tab) {
int i;
if ((addr == NULL) || (tab == NULL) || (addr->data.stor.ss_family != AF_INET6))
return -1;
for (i = 0;i < 8;i++) {
(*tab)[i] = ((addr->data.inet6.sin6_addr.s6_addr[2 * i] << 8) |
addr->data.inet6.sin6_addr.s6_addr[2 * i + 1]);
}
return 0;
}
/**
* virSocketAddrParse:
* @val: a numeric network address IPv4 or IPv6
* @addr: where to store the return value, optional.
* @family: address family to pass down to getaddrinfo
*
* Mostly a wrapper for getaddrinfo() extracting the address storage
* from the numeric string like 1.2.3.4 or 2001:db8:85a3:0:0:8a2e:370:7334
*
* Returns the length of the network address or -1 in case of error.
*/
int virSocketAddrParse(virSocketAddrPtr addr, const char *val, int family) {
int len;
struct addrinfo hints;
struct addrinfo *res = NULL;
int err;
if (val == NULL) {
virReportError(VIR_ERR_INVALID_ARG, "%s", _("Missing address"));
return -1;
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_flags = AI_NUMERICHOST;
if ((err = getaddrinfo(val, NULL, &hints, &res)) != 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Cannot parse socket address '%s': %s"),
val, gai_strerror(err));
return -1;
}
if (res == NULL) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("No socket addresses found for '%s'"),
val);
return -1;
}
len = res->ai_addrlen;
if (addr != NULL) {
memcpy(&addr->data.stor, res->ai_addr, len);
addr->len = res->ai_addrlen;
}
freeaddrinfo(res);
return len;
}
/*
* virSocketAddrParseIPv4:
* @val: an IPv4 numeric address
* @addr: the location to store the result
*
* Extract the address storage from an IPv4 numeric address
*
* Returns the length of the network address or -1 in case of error.
*/
int
virSocketAddrParseIPv4(virSocketAddrPtr addr, const char *val) {
return virSocketAddrParse(addr, val, AF_INET);
}
/*
* virSocketAddrParseIPv6:
* @val: an IPv6 numeric address
* @addr: the location to store the result
*
* Extract the address storage from an IPv6 numeric address
*
* Returns the length of the network address or -1 in case of error.
*/
int
virSocketAddrParseIPv6(virSocketAddrPtr addr, const char *val) {
return virSocketAddrParse(addr, val, AF_INET6);
}
/*
* virSocketAddrSetIPv4Addr:
* @addr: the location to store the result
* @val: the 32bit integer in host byte order representing the IPv4 address
*
* Set the IPv4 address given an integer in host order. This function does not
* touch any previously set port.
*/
void
virSocketAddrSetIPv4Addr(virSocketAddrPtr addr, uint32_t val)
{
addr->data.stor.ss_family = AF_INET;
addr->data.inet4.sin_addr.s_addr = htonl(val);
addr->len = sizeof(struct sockaddr_in);
}
/*
* virSocketAddrEqual:
* @s1: the location of the one IP address
* @s2: the location of the other IP address
*
* Compare two IP addresses for equality. Two addresses are equal
* if their IP addresses and ports are equal.
*/
bool
virSocketAddrEqual(const virSocketAddrPtr s1, const virSocketAddrPtr s2)
{
if (s1->data.stor.ss_family != s2->data.stor.ss_family)
return false;
switch (s1->data.stor.ss_family) {
case AF_INET:
return (memcmp(&s1->data.inet4.sin_addr.s_addr,
&s2->data.inet4.sin_addr.s_addr,
sizeof(s1->data.inet4.sin_addr.s_addr)) == 0 &&
s1->data.inet4.sin_port == s2->data.inet4.sin_port);
case AF_INET6:
return (memcmp(&s1->data.inet6.sin6_addr.s6_addr,
&s2->data.inet6.sin6_addr.s6_addr,
sizeof(s1->data.inet6.sin6_addr.s6_addr)) == 0 &&
s1->data.inet6.sin6_port == s2->data.inet6.sin6_port);
}
return false;
}
/*
* virSocketAddrFormat:
* @addr: an initialized virSocketAddrPtr
*
* Returns a string representation of the given address
* Returns NULL on any error
* Caller must free the returned string
*/
char *
virSocketAddrFormat(virSocketAddrPtr addr) {
return virSocketAddrFormatFull(addr, false, NULL);
}
/*
* virSocketAddrFormatFull:
* @addr: an initialized virSocketAddrPtr
* @withService: if true, then service info is appended
* @separator: separator between hostname & service.
*
* Returns a string representation of the given address
* Returns NULL on any error
* Caller must free the returned string
*/
char *
virSocketAddrFormatFull(virSocketAddrPtr addr,
bool withService,
const char *separator)
{
char host[NI_MAXHOST], port[NI_MAXSERV];
char *addrstr;
int err;
if (addr == NULL) {
virReportError(VIR_ERR_INVALID_ARG, "%s", _("Missing address"));
return NULL;
}
/* Short-circuit since getnameinfo doesn't work
* nicely for UNIX sockets */
if (addr->data.sa.sa_family == AF_UNIX) {
if (withService) {
if (virAsprintf(&addrstr, "127.0.0.1%s0",
separator ? separator : ":") < 0)
goto no_memory;
} else {
if (!(addrstr = strdup("127.0.0.1")))
goto no_memory;
}
return addrstr;
}
if ((err = getnameinfo(&addr->data.sa,
addr->len,
host, sizeof(host),
port, sizeof(port),
NI_NUMERICHOST | NI_NUMERICSERV)) != 0) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Cannot convert socket address to string: %s"),
gai_strerror(err));
return NULL;
}
if (withService) {
if (virAsprintf(&addrstr, "%s%s%s", host, separator, port) == -1)
goto no_memory;
} else {
if (!(addrstr = strdup(host)))
goto no_memory;
}
return addrstr;
no_memory:
virReportOOMError();
return NULL;
}
/*
* virSocketAddrSetPort:
* @addr: an initialized virSocketAddrPtr
* @port: the port number to set
*
* Set the transport layer port of the given virtSocketAddr
*
* Returns 0 on success, -1 on failure
*/
int
virSocketAddrSetPort(virSocketAddrPtr addr, int port) {
if (addr == NULL)
return -1;
port = htons(port);
if(addr->data.stor.ss_family == AF_INET) {
addr->data.inet4.sin_port = port;
}
else if(addr->data.stor.ss_family == AF_INET6) {
addr->data.inet6.sin6_port = port;
}
else {
return -1;
}
return 0;
}
/*
* virSocketGetPort:
* @addr: an initialized virSocketAddrPtr
*
* Returns the transport layer port of the given virtSocketAddr
* Returns -1 if @addr is invalid
*/
int
virSocketAddrGetPort(virSocketAddrPtr addr) {
if (addr == NULL)
return -1;
if(addr->data.stor.ss_family == AF_INET) {
return ntohs(addr->data.inet4.sin_port);
}
else if(addr->data.stor.ss_family == AF_INET6) {
return ntohs(addr->data.inet6.sin6_port);
}
return -1;
}
/**
* virSocketAddrIsNetmask:
* @netmask: the netmask address
*
* Check that @netmask is a proper network mask
*
* Returns 0 in case of success and -1 in case of error
*/
int virSocketAddrIsNetmask(virSocketAddrPtr netmask) {
int n = virSocketAddrGetNumNetmaskBits(netmask);
if (n < 0)
return -1;
return 0;
}
/**
* virSocketAddrMask:
* @addr: address that needs to be masked
* @netmask: the netmask address
* @network: where to store the result, can be same as @addr
*
* Mask off the host bits of @addr according to @netmask, turning it
* into a network address.
*
* Returns 0 in case of success, or -1 on error.
*/
int
virSocketAddrMask(const virSocketAddrPtr addr,
const virSocketAddrPtr netmask,
virSocketAddrPtr network)
{
if (addr->data.stor.ss_family != netmask->data.stor.ss_family) {
network->data.stor.ss_family = AF_UNSPEC;
return -1;
}
if (addr->data.stor.ss_family == AF_INET) {
network->data.inet4.sin_addr.s_addr
= (addr->data.inet4.sin_addr.s_addr
& netmask->data.inet4.sin_addr.s_addr);
network->data.inet4.sin_port = 0;
network->data.stor.ss_family = AF_INET;
network->len = addr->len;
return 0;
}
if (addr->data.stor.ss_family == AF_INET6) {
int ii;
for (ii = 0; ii < 16; ii++) {
network->data.inet6.sin6_addr.s6_addr[ii]
= (addr->data.inet6.sin6_addr.s6_addr[ii]
& netmask->data.inet6.sin6_addr.s6_addr[ii]);
}
network->data.inet6.sin6_port = 0;
network->data.stor.ss_family = AF_INET6;
network->len = addr->len;
return 0;
}
network->data.stor.ss_family = AF_UNSPEC;
return -1;
}
/**
* virSocketAddrMaskByPrefix:
* @addr: address that needs to be masked
* @prefix: prefix (# of 1 bits) of netmask to apply
* @network: where to store the result, can be same as @addr
*
* Mask off the host bits of @addr according to @prefix, turning it
* into a network address.
*
* Returns 0 in case of success, or -1 on error.
*/
int
virSocketAddrMaskByPrefix(const virSocketAddrPtr addr,
unsigned int prefix,
virSocketAddrPtr network)
{
virSocketAddr netmask;
if (virSocketAddrPrefixToNetmask(prefix, &netmask,
addr->data.stor.ss_family) < 0) {
network->data.stor.ss_family = AF_UNSPEC;
return -1;
}
return virSocketAddrMask(addr, &netmask, network);
}
/**
* virSocketAddrBroadcast:
* @addr: address that needs to be turned into broadcast address (IPv4 only)
* @netmask: the netmask address
* @broadcast: virSocketAddr to recieve the broadcast address
*
* Mask ON the host bits of @addr according to @netmask, turning it
* into a broadcast address.
*
* Returns 0 in case of success, or -1 on error.
*/
int
virSocketAddrBroadcast(const virSocketAddrPtr addr,
const virSocketAddrPtr netmask,
virSocketAddrPtr broadcast)
{
if ((addr->data.stor.ss_family != AF_INET) ||
(netmask->data.stor.ss_family != AF_INET)) {
broadcast->data.stor.ss_family = AF_UNSPEC;
return -1;
}
broadcast->data.stor.ss_family = AF_INET;
broadcast->len = addr->len;
broadcast->data.inet4.sin_addr.s_addr
= (addr->data.inet4.sin_addr.s_addr
| ~netmask->data.inet4.sin_addr.s_addr);
return 0;
}
/**
* virSocketAddrBroadcastByPrefix:
* @addr: address that needs to be turned into broadcast address (IPv4 only)
* @prefix: prefix (# of 1 bits) of netmask to apply
* @broadcast: virSocketAddr to recieve the broadcast address
*
* Mask off the host bits of @addr according to @prefix, turning it
* into a network address.
*
* Returns 0 in case of success, or -1 on error.
*/
int
virSocketAddrBroadcastByPrefix(const virSocketAddrPtr addr,
unsigned int prefix,
virSocketAddrPtr broadcast)
{
virSocketAddr netmask;
if (virSocketAddrPrefixToNetmask(prefix, &netmask,
addr->data.stor.ss_family) < 0)
return -1;
return virSocketAddrBroadcast(addr, &netmask, broadcast);
}
/**
* virSocketCheckNetmask:
* @addr1: a first network address
* @addr2: a second network address
* @netmask: the netmask address
*
* Check that @addr1 and @addr2 pertain to the same @netmask address
* range and returns the size of the range
*
* Returns 1 in case of success and 0 in case of failure and
* -1 in case of error
*/
int virSocketAddrCheckNetmask(virSocketAddrPtr addr1, virSocketAddrPtr addr2,
virSocketAddrPtr netmask) {
int i;
if ((addr1 == NULL) || (addr2 == NULL) || (netmask == NULL))
return -1;
if ((addr1->data.stor.ss_family != addr2->data.stor.ss_family) ||
(addr1->data.stor.ss_family != netmask->data.stor.ss_family))
return -1;
if (virSocketAddrIsNetmask(netmask) != 0)
return -1;
if (addr1->data.stor.ss_family == AF_INET) {
virSocketAddrIPv4 t1, t2, tm;
if ((virSocketAddrGetIPv4Addr(addr1, &t1) < 0) ||
(virSocketAddrGetIPv4Addr(addr2, &t2) < 0) ||
(virSocketAddrGetIPv4Addr(netmask, &tm) < 0))
return -1;
for (i = 0;i < 4;i++) {
if ((t1[i] & tm[i]) != (t2[i] & tm[i]))
return 0;
}
} else if (addr1->data.stor.ss_family == AF_INET6) {
virSocketAddrIPv6 t1, t2, tm;
if ((virSocketAddrGetIPv6Addr(addr1, &t1) < 0) ||
(virSocketAddrGetIPv6Addr(addr2, &t2) < 0) ||
(virSocketAddrGetIPv6Addr(netmask, &tm) < 0))
return -1;
for (i = 0;i < 8;i++) {
if ((t1[i] & tm[i]) != (t2[i] & tm[i]))
return 0;
}
} else {
return -1;
}
return 1;
}
/**
* virSocketGetRange:
* @start: start of an IP range
* @end: end of an IP range
*
* Check the order of the 2 addresses and compute the range, this
* will return 1 for identical addresses. Errors can come from incompatible
* addresses type, excessive range (>= 2^^16) where the two addresses are
* unrelated or inverted start and end.
*
* Returns the size of the range or -1 in case of failure
*/
int virSocketAddrGetRange(virSocketAddrPtr start, virSocketAddrPtr end) {
int ret = 0, i;
if ((start == NULL) || (end == NULL))
return -1;
if (start->data.stor.ss_family != end->data.stor.ss_family)
return -1;
if (start->data.stor.ss_family == AF_INET) {
virSocketAddrIPv4 t1, t2;
if ((virSocketAddrGetIPv4Addr(start, &t1) < 0) ||
(virSocketAddrGetIPv4Addr(end, &t2) < 0))
return -1;
for (i = 0;i < 2;i++) {
if (t1[i] != t2[i])
return -1;
}
ret = (t2[2] - t1[2]) * 256 + (t2[3] - t1[3]);
if (ret < 0)
return -1;
ret++;
} else if (start->data.stor.ss_family == AF_INET6) {
virSocketAddrIPv6 t1, t2;
if ((virSocketAddrGetIPv6Addr(start, &t1) < 0) ||
(virSocketAddrGetIPv6Addr(end, &t2) < 0))
return -1;
for (i = 0;i < 7;i++) {
if (t1[i] != t2[i])
return -1;
}
ret = t2[7] - t1[7];
if (ret < 0)
return -1;
ret++;
} else {
return -1;
}
return ret;
}
/**
* virSocketAddrGetNumNetmaskBits
* @netmask: the presumed netmask
*
* Get the number of netmask bits in a netmask.
*
* Returns the number of bits in the netmask or -1 if an error occurred
* or the netmask is invalid.
*/
int virSocketAddrGetNumNetmaskBits(const virSocketAddrPtr netmask)
{
int i, j;
int c = 0;
if (netmask->data.stor.ss_family == AF_INET) {
virSocketAddrIPv4 tm;
uint8_t bit;
if (virSocketAddrGetIPv4Addr(netmask, &tm) < 0)
return -1;
for (i = 0; i < 4; i++)
if (tm[i] == 0xff)
c += 8;
else
break;
if (c == 8 * 4)
return c;
j = i << 3;
while (j < (8 * 4)) {
bit = 1 << (7 - (j & 7));
if ((tm[j >> 3] & bit)) {
c++;
} else
break;
j++;
}
while (j < (8 * 4)) {
bit = 1 << (7 - (j & 7));
if ((tm[j >> 3] & bit))
return -1;
j++;
}
return c;
} else if (netmask->data.stor.ss_family == AF_INET6) {
virSocketAddrIPv6 tm;
uint16_t bit;
if (virSocketAddrGetIPv6Addr(netmask, &tm) < 0)
return -1;
for (i = 0; i < 8; i++)
if (tm[i] == 0xffff)
c += 16;
else
break;
if (c == 16 * 8)
return c;
j = i << 4;
while (j < (16 * 8)) {
bit = 1 << (15 - (j & 0xf));
if ((tm[j >> 4] & bit)) {
c++;
} else
break;
j++;
}
while (j < (16 * 8)) {
bit = 1 << (15 - (j & 0xf));
if ((tm[j >> 4]) & bit)
return -1;
j++;
}
return c;
}
return -1;
}
/**
* virSocketPrefixToNetmask:
* @prefix: number of 1 bits to put in the netmask
* @netmask: address to fill in with the desired netmask
* @family: family of the address (AF_INET or AF_INET6 only)
*
* given @prefix and @family, fill in @netmask with a netmask
* (eg 255.255.255.0).
*
* Returns 0 on success or -1 on error.
*/
int
virSocketAddrPrefixToNetmask(unsigned int prefix,
virSocketAddrPtr netmask,
int family)
{
int result = -1;
netmask->data.stor.ss_family = AF_UNSPEC; /* assume failure */
if (family == AF_INET) {
int ip;
if (prefix > 32)
goto error;
ip = prefix ? ~((1 << (32 - prefix)) - 1) : 0;
netmask->data.inet4.sin_addr.s_addr = htonl(ip);
netmask->data.stor.ss_family = AF_INET;
result = 0;
} else if (family == AF_INET6) {
int ii = 0;
if (prefix > 128)
goto error;
while (prefix >= 8) {
/* do as much as possible an entire byte at a time */
netmask->data.inet6.sin6_addr.s6_addr[ii++] = 0xff;
prefix -= 8;
}
if (prefix > 0) {
/* final partial byte */
netmask->data.inet6.sin6_addr.s6_addr[ii++]
= ~((1 << (8 - prefix)) -1);
}
while (ii < 16) {
/* zerofill remainder in case it wasn't initialized */
netmask->data.inet6.sin6_addr.s6_addr[ii++] = 0;
}
netmask->data.stor.ss_family = AF_INET6;
result = 0;
}
error:
return result;
}
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