#include <errno.h>
#include <net/if.h>
#include <stdint.h>
+#include <stdio.h>
#include <stdlib.h>
#include "alloc-util.h"
+#include "errno-util.h"
#include "in-addr-util.h"
#include "macro.h"
#include "parse-util.h"
+#include "random-util.h"
+#include "string-util.h"
+#include "strxcpyx.h"
#include "util.h"
bool in4_addr_is_null(const struct in_addr *a) {
return (be32toh(a->s_addr) & UINT32_C(0xFF000000)) == UINT32_C(127) << 24;
}
+bool in4_addr_is_non_local(const struct in_addr *a) {
+ /* Whether the address is not null and not localhost.
+ *
+ * As such, it is suitable to configure as DNS/NTP server from DHCP. */
+ return !in4_addr_is_null(a) &&
+ !in4_addr_is_localhost(a);
+}
+
int in_addr_is_localhost(int family, const union in_addr_union *u) {
assert(u);
return -EAFNOSUPPORT;
}
+bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b) {
+ assert(a);
+ assert(b);
+
+ return a->s_addr == b->s_addr;
+}
+
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;
+ return in4_addr_equal(&a->in, &b->in);
if (family == AF_INET6)
return
assert(u);
/* Increases the network part of an address by one. Returns
- * positive it that succeeds, or 0 if this overflows. */
+ * positive if that succeeds, or -ERANGE if this overflows. */
+
+ return in_addr_prefix_nth(family, u, prefixlen, 1);
+}
+
+/*
+ * Calculates the nth prefix of size prefixlen starting from the address denoted by u.
+ *
+ * On success 1 will be returned and the calculated prefix will be available in
+ * u. In the case nth == 0 the input will be left unchanged and 1 will be returned.
+ * In case the calculation cannot be performed (invalid prefix length,
+ * overflows would occur) -ERANGE is returned. If the address family given isn't
+ * supported -EAFNOSUPPORT will be returned.
+ *
+ *
+ * Examples:
+ * - in_addr_prefix_nth(AF_INET, 192.168.0.0, 24, 2), returns 1, writes 192.168.2.0 to u
+ * - in_addr_prefix_nth(AF_INET, 192.168.0.0, 24, 0), returns 1, no data written
+ * - in_addr_prefix_nth(AF_INET, 255.255.255.0, 24, 1), returns -ERANGE, no data written
+ * - in_addr_prefix_nth(AF_INET, 255.255.255.0, 0, 1), returns -ERANGE, no data written
+ * - in_addr_prefix_nth(AF_INET6, 2001:db8, 64, 0xff00) returns 1, writes 2001:0db8:0000:ff00:: to u
+ */
+int in_addr_prefix_nth(int family, union in_addr_union *u, unsigned prefixlen, uint64_t nth) {
+ assert(u);
if (prefixlen <= 0)
- return 0;
+ return -ERANGE;
- if (family == AF_INET) {
- uint32_t c, n;
+ if (nth == 0)
+ return 1;
+ if (family == AF_INET) {
+ uint32_t c, n, t;
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);
+ t = nth << (32 - prefixlen);
+
+ /* Check for wrap */
+ if (c > UINT32_MAX - t)
+ return -ERANGE;
+
+ n = c + t;
+
+ n &= UINT32_C(0xFFFFFFFF) << (32 - prefixlen);
u->in.s_addr = htobe32(n);
return 1;
}
if (family == AF_INET6) {
- struct in6_addr add = {}, result;
+ struct in6_addr result = {};
uint8_t overflow = 0;
- unsigned i;
+ uint64_t delta; /* this assumes that we only ever have to up to 1<<64 subnets */
+ unsigned start_byte = (prefixlen - 1) / 8;
if (prefixlen > 128)
prefixlen = 128;
/* First calculate what we have to add */
- add.s6_addr[(prefixlen-1) / 8] = 1 << (7 - (prefixlen-1) % 8);
+ delta = nth << ((128 - prefixlen) % 8);
- for (i = 16; i > 0; i--) {
+ for (unsigned i = 16; i > 0; i--) {
unsigned j = i - 1;
+ unsigned d = 0;
+
+ if (j <= start_byte) {
+ int16_t t;
+
+ d = delta & 0xFF;
+ delta >>= 8;
+
+ t = u->in6.s6_addr[j] + d + overflow;
+ overflow = t > UINT8_MAX ? t - UINT8_MAX : 0;
- result.s6_addr[j] = u->in6.s6_addr[j] + add.s6_addr[j] + overflow;
- overflow = (result.s6_addr[j] < u->in6.s6_addr[j]);
+ result.s6_addr[j] = (uint8_t)t;
+ } else
+ result.s6_addr[j] = u->in6.s6_addr[j];
}
- if (overflow)
- return 0;
+ if (overflow || delta != 0)
+ return -ERANGE;
u->in6 = result;
return 1;
return -EAFNOSUPPORT;
}
+int in_addr_random_prefix(
+ int family,
+ union in_addr_union *u,
+ unsigned prefixlen_fixed_part,
+ unsigned prefixlen) {
+
+ assert(u);
+
+ /* Random network part of an address by one. */
+
+ if (prefixlen <= 0)
+ return 0;
+
+ if (family == AF_INET) {
+ uint32_t c, n;
+
+ if (prefixlen_fixed_part > 32)
+ prefixlen_fixed_part = 32;
+ if (prefixlen > 32)
+ prefixlen = 32;
+ if (prefixlen_fixed_part >= prefixlen)
+ return -EINVAL;
+
+ c = be32toh(u->in.s_addr);
+ c &= ((UINT32_C(1) << prefixlen_fixed_part) - 1) << (32 - prefixlen_fixed_part);
+
+ random_bytes(&n, sizeof(n));
+ n &= ((UINT32_C(1) << (prefixlen - prefixlen_fixed_part)) - 1) << (32 - prefixlen);
+
+ u->in.s_addr = htobe32(n | c);
+ return 1;
+ }
+
+ if (family == AF_INET6) {
+ struct in6_addr n;
+ unsigned i, j;
+
+ if (prefixlen_fixed_part > 128)
+ prefixlen_fixed_part = 128;
+ if (prefixlen > 128)
+ prefixlen = 128;
+ if (prefixlen_fixed_part >= prefixlen)
+ return -EINVAL;
+
+ random_bytes(&n, sizeof(n));
+
+ for (i = 0; i < 16; i++) {
+ uint8_t mask_fixed_part = 0, mask = 0;
+
+ if (i < (prefixlen_fixed_part + 7) / 8) {
+ if (i < prefixlen_fixed_part / 8)
+ mask_fixed_part = 0xffu;
+ else {
+ j = prefixlen_fixed_part % 8;
+ mask_fixed_part = ((UINT8_C(1) << (j + 1)) - 1) << (8 - j);
+ }
+ }
+
+ if (i < (prefixlen + 7) / 8) {
+ if (i < prefixlen / 8)
+ mask = 0xffu ^ mask_fixed_part;
+ else {
+ j = prefixlen % 8;
+ mask = (((UINT8_C(1) << (j + 1)) - 1) << (8 - j)) ^ mask_fixed_part;
+ }
+ }
+
+ u->in6.s6_addr[i] &= mask_fixed_part;
+ u->in6.s6_addr[i] |= n.s6_addr[i] & mask;
+ }
+
+ return 1;
+ }
+
+ return -EAFNOSUPPORT;
+}
+
int in_addr_to_string(int family, const union in_addr_union *u, char **ret) {
- char *x;
+ _cleanup_free_ char *x = NULL;
size_t l;
assert(u);
return -ENOMEM;
errno = 0;
- if (!inet_ntop(family, u, x, l)) {
- free(x);
- return errno > 0 ? -errno : -EINVAL;
- }
+ if (!inet_ntop(family, u, x, l))
+ return errno_or_else(EINVAL);
+
+ *ret = TAKE_PTR(x);
+ return 0;
+}
+
+int in_addr_prefix_to_string(int family, const union in_addr_union *u, unsigned prefixlen, char **ret) {
+ _cleanup_free_ char *x = NULL;
+ char *p;
+ size_t l;
+
+ assert(u);
+ assert(ret);
+
+ if (family == AF_INET)
+ l = INET_ADDRSTRLEN + 3;
+ else if (family == AF_INET6)
+ l = INET6_ADDRSTRLEN + 4;
+ else
+ return -EAFNOSUPPORT;
+
+ if (prefixlen > FAMILY_ADDRESS_SIZE(family) * 8)
+ return -EINVAL;
- *ret = x;
+ x = new(char, l);
+ if (!x)
+ return -ENOMEM;
+
+ errno = 0;
+ if (!inet_ntop(family, u, x, l))
+ return errno_or_else(EINVAL);
+
+ p = x + strlen(x);
+ l -= strlen(x);
+ (void) strpcpyf(&p, l, "/%u", prefixlen);
+
+ *ret = TAKE_PTR(x);
return 0;
}
int in_addr_ifindex_to_string(int family, const union in_addr_union *u, int ifindex, char **ret) {
+ _cleanup_free_ char *x = NULL;
size_t l;
- char *x;
int r;
assert(u);
return -ENOMEM;
errno = 0;
- if (!inet_ntop(family, u, x, l)) {
- free(x);
- return errno > 0 ? -errno : -EINVAL;
- }
+ if (!inet_ntop(family, u, x, l))
+ return errno_or_else(EINVAL);
sprintf(strchr(x, 0), "%%%i", ifindex);
- *ret = x;
+ *ret = TAKE_PTR(x);
return 0;
fallback:
return in_addr_to_string(family, u, ret);
}
+int in_addr_port_ifindex_name_to_string(int family, const union in_addr_union *u, uint16_t port, int ifindex, const char *server_name, char **ret) {
+ _cleanup_free_ char *ip_str = NULL, *x = NULL;
+ int r;
+
+ assert(IN_SET(family, AF_INET, AF_INET6));
+ 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. */
+
+ r = in_addr_to_string(family, u, &ip_str);
+ if (r < 0)
+ return r;
+
+ if (family == AF_INET6) {
+ r = in_addr_is_link_local(family, u);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ ifindex = 0;
+ } else
+ ifindex = 0; /* For IPv4 address, ifindex is always ignored. */
+
+ if (port == 0 && ifindex == 0 && isempty(server_name)) {
+ *ret = TAKE_PTR(ip_str);
+ return 0;
+ }
+
+ const char *separator = isempty(server_name) ? "" : "#";
+ server_name = strempty(server_name);
+
+ if (port > 0) {
+ if (family == AF_INET6) {
+ if (ifindex > 0)
+ r = asprintf(&x, "[%s]:%"PRIu16"%%%i%s%s", ip_str, port, ifindex, separator, server_name);
+ else
+ r = asprintf(&x, "[%s]:%"PRIu16"%s%s", ip_str, port, separator, server_name);
+ } else
+ r = asprintf(&x, "%s:%"PRIu16"%s%s", ip_str, port, separator, server_name);
+ } else {
+ if (ifindex > 0)
+ r = asprintf(&x, "%s%%%i%s%s", ip_str, ifindex, separator, server_name);
+ else {
+ x = strjoin(ip_str, separator, server_name);
+ r = x ? 0 : -ENOMEM;
+ }
+ }
+ if (r < 0)
+ return -ENOMEM;
+
+ *ret = TAKE_PTR(x);
+ return 0;
+}
+
int in_addr_from_string(int family, const char *s, union in_addr_union *ret) {
union in_addr_union buffer;
assert(s);
errno = 0;
if (inet_pton(family, s, ret ?: &buffer) <= 0)
- return errno > 0 ? -errno : -EINVAL;
+ return errno_or_else(EINVAL);
return 0;
}
return -EINVAL;
}
-int in_addr_ifindex_from_string_auto(const char *s, int *family, union in_addr_union *ret, int *ifindex) {
- _cleanup_free_ char *buf = NULL;
- 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;
- }
- }
-
- buf = strndup(s, suffix - s);
- if (!buf)
- return -ENOMEM;
-
- s = buf;
- }
-
- r = in_addr_from_string_auto(s, family, ret);
- if (r < 0)
- return r;
-
- if (ifindex)
- *ifindex = ifi;
-
- return r;
-}
-
unsigned char in4_addr_netmask_to_prefixlen(const struct in_addr *addr) {
assert(addr);
}
DEFINE_HASH_OPS(in_addr_data_hash_ops, struct in_addr_data, in_addr_data_hash_func, in_addr_data_compare_func);
+
+static void in6_addr_hash_func(const struct in6_addr *addr, struct siphash *state) {
+ assert(addr);
+
+ siphash24_compress(addr, sizeof(*addr), state);
+}
+
+static int in6_addr_compare_func(const struct in6_addr *a, const struct in6_addr *b) {
+ return memcmp(a, b, sizeof(*a));
+}
+
+DEFINE_HASH_OPS(in6_addr_hash_ops, struct in6_addr, in6_addr_hash_func, in6_addr_compare_func);
projects / thirdparty / systemd.git / blobdiff