diff options
Diffstat (limited to 'src/basic/in-addr-util.c')
-rw-r--r-- | src/basic/in-addr-util.c | 449 |
1 files changed, 0 insertions, 449 deletions
diff --git a/src/basic/in-addr-util.c b/src/basic/in-addr-util.c deleted file mode 100644 index aa7ccd1afd..0000000000 --- a/src/basic/in-addr-util.c +++ /dev/null @@ -1,449 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2014 Lennart Poettering - - systemd 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. - - systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <arpa/inet.h> -#include <endian.h> -#include <errno.h> -#include <net/if.h> -#include <stdint.h> -#include <stdlib.h> - -#include "alloc-util.h" -#include "in-addr-util.h" -#include "macro.h" -#include "parse-util.h" -#include "util.h" - -bool in4_addr_is_null(const struct in_addr *a) { - return a->s_addr == 0; -} - -bool in6_addr_is_null(const struct in6_addr *a) { - return - a->s6_addr32[0] == 0 && - a->s6_addr32[1] == 0 && - a->s6_addr32[2] == 0 && - a->s6_addr32[3] == 0; -} - -int in_addr_is_null(int family, const union in_addr_union *u) { - assert(u); - - if (family == AF_INET) - return in4_addr_is_null(&u->in); - - if (family == AF_INET6) - return in6_addr_is_null(&u->in6); - - return -EAFNOSUPPORT; -} - -int in_addr_is_link_local(int family, const union in_addr_union *u) { - assert(u); - - if (family == AF_INET) - return (be32toh(u->in.s_addr) & UINT32_C(0xFFFF0000)) == (UINT32_C(169) << 24 | UINT32_C(254) << 16); - - if (family == AF_INET6) - return IN6_IS_ADDR_LINKLOCAL(&u->in6); - - return -EAFNOSUPPORT; -} - -int in_addr_is_localhost(int family, const union in_addr_union *u) { - assert(u); - - if (family == AF_INET) - /* All of 127.x.x.x is localhost. */ - return (be32toh(u->in.s_addr) & UINT32_C(0xFF000000)) == UINT32_C(127) << 24; - - if (family == AF_INET6) - return IN6_IS_ADDR_LOOPBACK(&u->in6); - - return -EAFNOSUPPORT; -} - -int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b) { - assert(a); - assert(b); - - if (family == AF_INET) - return a->in.s_addr == b->in.s_addr; - - if (family == AF_INET6) - return - a->in6.s6_addr32[0] == b->in6.s6_addr32[0] && - a->in6.s6_addr32[1] == b->in6.s6_addr32[1] && - a->in6.s6_addr32[2] == b->in6.s6_addr32[2] && - a->in6.s6_addr32[3] == b->in6.s6_addr32[3]; - - return -EAFNOSUPPORT; -} - -int in_addr_prefix_intersect( - int family, - const union in_addr_union *a, - unsigned aprefixlen, - const union in_addr_union *b, - unsigned bprefixlen) { - - unsigned m; - - assert(a); - assert(b); - - /* Checks whether there are any addresses that are in both - * networks */ - - m = MIN(aprefixlen, bprefixlen); - - if (family == AF_INET) { - uint32_t x, nm; - - x = be32toh(a->in.s_addr ^ b->in.s_addr); - nm = (m == 0) ? 0 : 0xFFFFFFFFUL << (32 - m); - - return (x & nm) == 0; - } - - if (family == AF_INET6) { - unsigned i; - - if (m > 128) - m = 128; - - for (i = 0; i < 16; i++) { - uint8_t x, nm; - - x = a->in6.s6_addr[i] ^ b->in6.s6_addr[i]; - - if (m < 8) - nm = 0xFF << (8 - m); - else - nm = 0xFF; - - if ((x & nm) != 0) - return 0; - - if (m > 8) - m -= 8; - else - m = 0; - } - - return 1; - } - - return -EAFNOSUPPORT; -} - -int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen) { - assert(u); - - /* Increases the network part of an address by one. Returns - * positive it that succeeds, or 0 if this overflows. */ - - if (prefixlen <= 0) - return 0; - - if (family == AF_INET) { - uint32_t c, n; - - if (prefixlen > 32) - prefixlen = 32; - - c = be32toh(u->in.s_addr); - n = c + (1UL << (32 - prefixlen)); - if (n < c) - return 0; - n &= 0xFFFFFFFFUL << (32 - prefixlen); - - u->in.s_addr = htobe32(n); - return 1; - } - - if (family == AF_INET6) { - struct in6_addr add = {}, result; - uint8_t overflow = 0; - unsigned i; - - if (prefixlen > 128) - prefixlen = 128; - - /* First calculate what we have to add */ - add.s6_addr[(prefixlen-1) / 8] = 1 << (7 - (prefixlen-1) % 8); - - for (i = 16; i > 0; i--) { - unsigned j = i - 1; - - result.s6_addr[j] = u->in6.s6_addr[j] + add.s6_addr[j] + overflow; - overflow = (result.s6_addr[j] < u->in6.s6_addr[j]); - } - - if (overflow) - return 0; - - u->in6 = result; - return 1; - } - - return -EAFNOSUPPORT; -} - -int in_addr_to_string(int family, const union in_addr_union *u, char **ret) { - char *x; - size_t l; - - assert(u); - assert(ret); - - if (family == AF_INET) - l = INET_ADDRSTRLEN; - else if (family == AF_INET6) - l = INET6_ADDRSTRLEN; - else - return -EAFNOSUPPORT; - - x = new(char, l); - if (!x) - return -ENOMEM; - - errno = 0; - if (!inet_ntop(family, u, x, l)) { - free(x); - return errno > 0 ? -errno : -EINVAL; - } - - *ret = x; - return 0; -} - -int in_addr_ifindex_to_string(int family, const union in_addr_union *u, int ifindex, char **ret) { - size_t l; - char *x; - int r; - - assert(u); - assert(ret); - - /* Much like in_addr_to_string(), but optionally appends the zone interface index to the address, to properly - * handle IPv6 link-local addresses. */ - - if (family != AF_INET6) - goto fallback; - if (ifindex <= 0) - goto fallback; - - r = in_addr_is_link_local(family, u); - if (r < 0) - return r; - if (r == 0) - goto fallback; - - l = INET6_ADDRSTRLEN + 1 + DECIMAL_STR_MAX(ifindex) + 1; - x = new(char, l); - if (!x) - return -ENOMEM; - - errno = 0; - if (!inet_ntop(family, u, x, l)) { - free(x); - return errno > 0 ? -errno : -EINVAL; - } - - sprintf(strchr(x, 0), "%%%i", ifindex); - *ret = x; - - return 0; - -fallback: - return in_addr_to_string(family, u, ret); -} - -int in_addr_from_string(int family, const char *s, union in_addr_union *ret) { - - assert(s); - assert(ret); - - if (!IN_SET(family, AF_INET, AF_INET6)) - return -EAFNOSUPPORT; - - errno = 0; - if (inet_pton(family, s, ret) <= 0) - return errno > 0 ? -errno : -EINVAL; - - return 0; -} - -int in_addr_from_string_auto(const char *s, int *family, union in_addr_union *ret) { - int r; - - assert(s); - assert(family); - assert(ret); - - r = in_addr_from_string(AF_INET, s, ret); - if (r >= 0) { - *family = AF_INET; - return 0; - } - - r = in_addr_from_string(AF_INET6, s, ret); - if (r >= 0) { - *family = AF_INET6; - return 0; - } - - return -EINVAL; -} - -int in_addr_ifindex_from_string_auto(const char *s, int *family, union in_addr_union *ret, int *ifindex) { - const char *suffix; - int r, ifi = 0; - - assert(s); - assert(family); - assert(ret); - - /* Similar to in_addr_from_string_auto() but also parses an optionally appended IPv6 zone suffix ("scope id") - * if one is found. */ - - suffix = strchr(s, '%'); - if (suffix) { - - if (ifindex) { - /* If we shall return the interface index, try to parse it */ - r = parse_ifindex(suffix + 1, &ifi); - if (r < 0) { - unsigned u; - - u = if_nametoindex(suffix + 1); - if (u <= 0) - return -errno; - - ifi = (int) u; - } - } - - s = strndupa(s, suffix - s); - } - - r = in_addr_from_string_auto(s, family, ret); - if (r < 0) - return r; - - if (ifindex) - *ifindex = ifi; - - return r; -} - -unsigned char in_addr_netmask_to_prefixlen(const struct in_addr *addr) { - assert(addr); - - return 32 - u32ctz(be32toh(addr->s_addr)); -} - -struct in_addr* in_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen) { - assert(addr); - assert(prefixlen <= 32); - - /* Shifting beyond 32 is not defined, handle this specially. */ - if (prefixlen == 0) - addr->s_addr = 0; - else - addr->s_addr = htobe32((0xffffffff << (32 - prefixlen)) & 0xffffffff); - - return addr; -} - -int in_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen) { - uint8_t msb_octet = *(uint8_t*) addr; - - /* addr may not be aligned, so make sure we only access it byte-wise */ - - assert(addr); - assert(prefixlen); - - if (msb_octet < 128) - /* class A, leading bits: 0 */ - *prefixlen = 8; - else if (msb_octet < 192) - /* class B, leading bits 10 */ - *prefixlen = 16; - else if (msb_octet < 224) - /* class C, leading bits 110 */ - *prefixlen = 24; - else - /* class D or E, no default prefixlen */ - return -ERANGE; - - return 0; -} - -int in_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask) { - unsigned char prefixlen; - int r; - - assert(addr); - assert(mask); - - r = in_addr_default_prefixlen(addr, &prefixlen); - if (r < 0) - return r; - - in_addr_prefixlen_to_netmask(mask, prefixlen); - return 0; -} - -int in_addr_mask(int family, union in_addr_union *addr, unsigned char prefixlen) { - assert(addr); - - if (family == AF_INET) { - struct in_addr mask; - - if (!in_addr_prefixlen_to_netmask(&mask, prefixlen)) - return -EINVAL; - - addr->in.s_addr &= mask.s_addr; - return 0; - } - - if (family == AF_INET6) { - unsigned i; - - for (i = 0; i < 16; i++) { - uint8_t mask; - - if (prefixlen >= 8) { - mask = 0xFF; - prefixlen -= 8; - } else { - mask = 0xFF << (8 - prefixlen); - prefixlen = 0; - } - - addr->in6.s6_addr[i] &= mask; - } - - return 0; - } - - return -EAFNOSUPPORT; -} |