/* * Copyright (C) 2009-2015 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 * . * * Authors: * Daniel Veillard * Laine Stump * Daniel P. Berrange */ #include #include "virsocketaddr.h" #include "virerror.h" #include "virstring.h" #include "viralloc.h" #include #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(const virSocketAddr *addr, virSocketAddrIPv4Ptr tab) { unsigned long val; size_t i; if (!addr || !tab || 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(const virSocketAddr *addr, virSocketAddrIPv6Ptr tab) { size_t i; if (!addr || !tab || 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; } static int virSocketAddrParseInternal(struct addrinfo **res, const char *val, int family, bool reportError) { struct addrinfo hints; 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) { if (reportError) virReportError(VIR_ERR_SYSTEM_ERROR, _("Cannot parse socket address '%s': %s"), val, gai_strerror(err)); return -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 *res; if (virSocketAddrParseInternal(&res, val, family, true) < 0) 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 virSocketAddr *s1, const virSocketAddr *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; } /* * virSocketAddrIsPrivate: * @s: the location of the IP address * * Return true if this address is in its family's defined * "private/local" address space. For IPv4, private addresses are in * the range of 192.168.0.0/16, 172.16.0.0/12, or 10.0.0.0/8. For * IPv6, local addresses are in the range of FC00::/7 or FEC0::/10 * (that last one is deprecated, but still in use). * * See RFC1918, RFC3484, and RFC4193 for details. */ bool virSocketAddrIsPrivate(const virSocketAddr *addr) { unsigned long val; switch (addr->data.stor.ss_family) { case AF_INET: val = ntohl(addr->data.inet4.sin_addr.s_addr); return ((val & 0xFFFF0000) == ((192L << 24) + (168 << 16)) || (val & 0xFFF00000) == ((172L << 24) + (16 << 16)) || (val & 0xFF000000) == ((10L << 24))); case AF_INET6: return ((addr->data.inet6.sin6_addr.s6_addr[0] & 0xFE) == 0xFC || ((addr->data.inet6.sin6_addr.s6_addr[0] & 0xFF) == 0xFE && (addr->data.inet6.sin6_addr.s6_addr[1] & 0xC0) == 0xC0)); } return false; } /* * virSocketAddrIsWildcard: * @addr: address to check * * Check if passed address is a variant of ANYCAST address. */ bool virSocketAddrIsWildcard(const virSocketAddr *addr) { struct in_addr tmp = { .s_addr = INADDR_ANY }; switch (addr->data.stor.ss_family) { case AF_INET: return memcmp(&addr->data.inet4.sin_addr.s_addr, &tmp.s_addr, sizeof(addr->data.inet4.sin_addr.s_addr)) == 0; case AF_INET6: return IN6_IS_ADDR_UNSPECIFIED(&addr->data.inet6.sin6_addr); } 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(const virSocketAddr *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(const virSocketAddr *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 error; } else { if (VIR_STRDUP(addrstr, "127.0.0.1") < 0) goto error; } 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 error; } else { if (VIR_STRDUP(addrstr, host) < 0) goto error; } return addrstr; error: 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 virSocketAddr *addr, const virSocketAddr *netmask, virSocketAddrPtr network) { memset(network, 0, sizeof(*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) { size_t i; for (i = 0; i < 16; i++) { network->data.inet6.sin6_addr.s6_addr[i] = (addr->data.inet6.sin6_addr.s6_addr[i] & netmask->data.inet6.sin6_addr.s6_addr[i]); } 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 virSocketAddr *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 receive 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 virSocketAddr *addr, const virSocketAddr *netmask, virSocketAddrPtr broadcast) { memset(broadcast, 0, sizeof(*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 receive 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 virSocketAddr *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) { size_t 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 * @network: IP address of network that should completely contain this range * @prefix: prefix of the network * * 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, inverted start and end, or a range that is not * within network/prefix. * * Returns the size of the range or -1 in case of failure */ int virSocketAddrGetRange(virSocketAddrPtr start, virSocketAddrPtr end, virSocketAddrPtr network, int prefix) { int ret = 0; size_t i; virSocketAddr netmask; char *startStr = NULL, *endStr = NULL, *netStr = NULL; if (start == NULL || end == NULL || network == NULL) { virReportError(VIR_ERR_INTERNAL_ERROR, _("NULL argument - %p %p %p"), start, end, network); goto error; } startStr = virSocketAddrFormat(start); endStr = virSocketAddrFormat(end); netStr = virSocketAddrFormat(network); if (!(startStr && endStr && netStr)) goto error; /*error already reported */ if (VIR_SOCKET_ADDR_FAMILY(start) != VIR_SOCKET_ADDR_FAMILY(end) || VIR_SOCKET_ADDR_FAMILY(start) != VIR_SOCKET_ADDR_FAMILY(network)) { virReportError(VIR_ERR_INTERNAL_ERROR, _("mismatch of address family in " "range %s - %s for network %s"), startStr, endStr, netStr); goto error; } if (prefix < 0 || virSocketAddrPrefixToNetmask(prefix, &netmask, VIR_SOCKET_ADDR_FAMILY(network)) < 0) { virReportError(VIR_ERR_INTERNAL_ERROR, _("bad prefix %d for network %s when " " checking range %s - %s"), prefix, netStr, startStr, endStr); goto error; } /* both start and end of range need to be in the same network as * "network" */ if (virSocketAddrCheckNetmask(start, network, &netmask) <= 0 || virSocketAddrCheckNetmask(end, network, &netmask) <= 0) { virReportError(VIR_ERR_INTERNAL_ERROR, _("range %s - %s is not entirely within " "network %s/%d"), startStr, endStr, netStr, prefix); goto error; } if (VIR_SOCKET_ADDR_IS_FAMILY(start, AF_INET)) { virSocketAddrIPv4 t1, t2; virSocketAddr netaddr, broadcast; if (virSocketAddrBroadcast(network, &netmask, &broadcast) < 0 || virSocketAddrMask(network, &netmask, &netaddr) < 0) { virReportError(VIR_ERR_INTERNAL_ERROR, _("failed to construct broadcast or network " "address for network %s/%d"), netStr, prefix); goto error; } /* Don't allow the start of the range to be the network * address (usually "...0") or the end of the range to be the * broadcast address (usually "...255"). (the opposite also * isn't allowed, but checking for that is implicit in all the * other combined checks) (IPv6 doesn't have broadcast and * network addresses, so this check is only done for IPv4) */ if (virSocketAddrEqual(start, &netaddr)) { virReportError(VIR_ERR_INTERNAL_ERROR, _("start of range %s - %s in network %s/%d " "is the network address"), startStr, endStr, netStr, prefix); goto error; } if (virSocketAddrEqual(end, &broadcast)) { virReportError(VIR_ERR_INTERNAL_ERROR, _("end of range %s - %s in network %s/%d " "is the broadcast address"), startStr, endStr, netStr, prefix); goto error; } if ((virSocketAddrGetIPv4Addr(start, &t1) < 0) || (virSocketAddrGetIPv4Addr(end, &t2) < 0)) { virReportError(VIR_ERR_INTERNAL_ERROR, _("failed to get IPv4 address " "for start or end of range %s - %s " "in network %s/%d"), startStr, endStr, netStr, prefix); goto error; } /* legacy check that everything except the last two bytes are * the same */ for (i = 0; i < 2; i++) { if (t1[i] != t2[i]) { virReportError(VIR_ERR_INTERNAL_ERROR, _("range %s - %s is too large (> 65535) " "in network %s/%d"), startStr, endStr, netStr, prefix); goto error; } } ret = (t2[2] - t1[2]) * 256 + (t2[3] - t1[3]); if (ret < 0) { virReportError(VIR_ERR_INTERNAL_ERROR, _("range %s - %s is reversed " "in network %s/%d"), startStr, endStr, netStr, prefix); goto error; } ret++; } else if (VIR_SOCKET_ADDR_IS_FAMILY(start, AF_INET6)) { virSocketAddrIPv6 t1, t2; if ((virSocketAddrGetIPv6Addr(start, &t1) < 0) || (virSocketAddrGetIPv6Addr(end, &t2) < 0)) { virReportError(VIR_ERR_INTERNAL_ERROR, _("failed to get IPv6 address " "for start or end of range %s - %s " "in network %s/%d"), startStr, endStr, netStr, prefix); goto error; } /* legacy check that everything except the last two bytes are * the same */ for (i = 0; i < 7; i++) { if (t1[i] != t2[i]) { virReportError(VIR_ERR_INTERNAL_ERROR, _("range %s - %s is too large (> 65535) " "in network %s/%d"), startStr, endStr, netStr, prefix); goto error; } } ret = t2[7] - t1[7]; if (ret < 0) { virReportError(VIR_ERR_INTERNAL_ERROR, _("range %s - %s start larger than end " "in network %s/%d"), startStr, endStr, netStr, prefix); goto error; } ret++; } else { virReportError(VIR_ERR_INTERNAL_ERROR, _("unsupported address family " "for range %s - %s " "in network %s/%d, must be ipv4 or ipv6"), startStr, endStr, netStr, prefix); goto error; } cleanup: VIR_FREE(startStr); VIR_FREE(endStr); VIR_FREE(netStr); return ret; error: ret = -1; goto cleanup; } /** * 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 virSocketAddr *netmask) { size_t 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) { size_t i = 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[i++] = 0xff; prefix -= 8; } if (prefix > 0) { /* final partial byte */ netmask->data.inet6.sin6_addr.s6_addr[i++] = ~((1 << (8 - prefix)) -1); } while (i < 16) { /* zerofill remainder in case it wasn't initialized */ netmask->data.inet6.sin6_addr.s6_addr[i++] = 0; } netmask->data.stor.ss_family = AF_INET6; result = 0; } error: return result; } /** * virSocketAddrGetIpPrefix: * @address: network address * @netmask: netmask for this network * @prefix: prefix if specified instead of netmask * * Returns prefix value on success or -1 on error. */ int virSocketAddrGetIpPrefix(const virSocketAddr *address, const virSocketAddr *netmask, int prefix) { if (prefix > 0) { return prefix; } else if (VIR_SOCKET_ADDR_VALID(netmask)) { return virSocketAddrGetNumNetmaskBits(netmask); } else if (VIR_SOCKET_ADDR_IS_FAMILY(address, AF_INET)) { /* Return the natural prefix for the network's ip address. * On Linux we could use the IN_CLASSx() macros, but those * aren't guaranteed on all platforms, so we just deal with * the bits ourselves. */ unsigned char octet = ntohl(address->data.inet4.sin_addr.s_addr) >> 24; /* If address is 0.0.0.0, we surely want to have 0 prefix for * the default route. */ if (address->data.inet4.sin_addr.s_addr == 0) return 0; if ((octet & 0x80) == 0) { /* Class A network */ return 8; } else if ((octet & 0xC0) == 0x80) { /* Class B network */ return 16; } else if ((octet & 0xE0) == 0xC0) { /* Class C network */ return 24; } return -1; } else if (VIR_SOCKET_ADDR_IS_FAMILY(address, AF_INET6)) { if (virSocketAddrIsWildcard(address)) return 0; return 64; } /* When none of the three (address/netmask/prefix) is given, 0 is * returned rather than error, because this is a valid * expectation, e.g. for the address/prefix used for a default * route (the destination of a default route is 0.0.0.0/0). */ return 0; } /** * virSocketAddrNumericFamily: * @address: address to check * * Check if passed address is an IP address in numeric format. * * Returns: AF_INET or AF_INET6 if @address is an numeric IP address, * -1 otherwise. */ int virSocketAddrNumericFamily(const char *address) { struct addrinfo *res; unsigned short family; if (virSocketAddrParseInternal(&res, address, AF_UNSPEC, false) < 0) return -1; family = res->ai_addr->sa_family; freeaddrinfo(res); return family; } /** * virSocketAddrIsNumericLocalhost: * @address: address to check * * Check if passed address is a numeric 'localhost' address. * * Returns: true if @address is a numeric 'localhost' address, * false otherwise */ bool virSocketAddrIsNumericLocalhost(const char *addr) { virSocketAddr res; struct in_addr tmp = { .s_addr = htonl(INADDR_LOOPBACK) }; if (virSocketAddrParse(&res, addr, AF_UNSPEC) < 0) return false; switch (res.data.stor.ss_family) { case AF_INET: return memcmp(&res.data.inet4.sin_addr.s_addr, &tmp.s_addr, sizeof(res.data.inet4.sin_addr.s_addr)) == 0; case AF_INET6: return IN6_IS_ADDR_LOOPBACK(&res.data.inet6.sin6_addr); } return false; }