Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 622 insertions, 0 deletions

diff --git a/src/basic/in-addr-util.c b/src/basic/in-addr-util.c
new file mode 100644
index 0000000..2bffe47
--- /dev/null
+++ b/src/basic/in-addr-util.c
@@ -0,0 +1,622 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#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) {
+        assert(a);
+
+        return a->s_addr == 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_IS_ADDR_UNSPECIFIED(&u->in6);
+
+        return -EAFNOSUPPORT;
+}
+
+bool in4_addr_is_link_local(const struct in_addr *a) {
+        assert(a);
+
+        return (be32toh(a->s_addr) & UINT32_C(0xFFFF0000)) == (UINT32_C(169) << 24 | UINT32_C(254) << 16);
+}
+
+int in_addr_is_link_local(int family, const union in_addr_union *u) {
+        assert(u);
+
+        if (family == AF_INET)
+                return in4_addr_is_link_local(&u->in);
+
+        if (family == AF_INET6)
+                return IN6_IS_ADDR_LINKLOCAL(&u->in6);
+
+        return -EAFNOSUPPORT;
+}
+
+int in_addr_is_multicast(int family, const union in_addr_union *u) {
+        assert(u);
+
+        if (family == AF_INET)
+                return IN_MULTICAST(be32toh(u->in.s_addr));
+
+        if (family == AF_INET6)
+                return IN6_IS_ADDR_MULTICAST(&u->in6);
+
+        return -EAFNOSUPPORT;
+}
+
+bool in4_addr_is_localhost(const struct in_addr *a) {
+        assert(a);
+
+        /* All of 127.x.x.x is localhost. */
+        return (be32toh(a->s_addr) & UINT32_C(0xFF000000)) == UINT32_C(127) << 24;
+}
+
+int in_addr_is_localhost(int family, const union in_addr_union *u) {
+        assert(u);
+
+        if (family == AF_INET)
+                return in4_addr_is_localhost(&u->in);
+
+        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) {
+        union in_addr_union buffer;
+        assert(s);
+
+        if (!IN_SET(family, AF_INET, AF_INET6))
+                return -EAFNOSUPPORT;
+
+        errno = 0;
+        if (inet_pton(family, s, ret ?: &buffer) <= 0)
+                return errno > 0 ? -errno : -EINVAL;
+
+        return 0;
+}
+
+int in_addr_from_string_auto(const char *s, int *ret_family, union in_addr_union *ret) {
+        int r;
+
+        assert(s);
+
+        r = in_addr_from_string(AF_INET, s, ret);
+        if (r >= 0) {
+                if (ret_family)
+                        *ret_family = AF_INET;
+                return 0;
+        }
+
+        r = in_addr_from_string(AF_INET6, s, ret);
+        if (r >= 0) {
+                if (ret_family)
+                        *ret_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) {
+        _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);
+
+        return 32U - u32ctz(be32toh(addr->s_addr));
+}
+
+struct in_addr* in4_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 in4_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 in4_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask) {
+        unsigned char prefixlen;
+        int r;
+
+        assert(addr);
+        assert(mask);
+
+        r = in4_addr_default_prefixlen(addr, &prefixlen);
+        if (r < 0)
+                return r;
+
+        in4_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 (!in4_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;
+}
+
+int in_addr_prefix_covers(int family,
+                          const union in_addr_union *prefix,
+                          unsigned char prefixlen,
+                          const union in_addr_union *address) {
+
+        union in_addr_union masked_prefix, masked_address;
+        int r;
+
+        assert(prefix);
+        assert(address);
+
+        masked_prefix = *prefix;
+        r = in_addr_mask(family, &masked_prefix, prefixlen);
+        if (r < 0)
+                return r;
+
+        masked_address = *address;
+        r = in_addr_mask(family, &masked_address, prefixlen);
+        if (r < 0)
+                return r;
+
+        return in_addr_equal(family, &masked_prefix, &masked_address);
+}
+
+int in_addr_parse_prefixlen(int family, const char *p, unsigned char *ret) {
+        uint8_t u;
+        int r;
+
+        if (!IN_SET(family, AF_INET, AF_INET6))
+                return -EAFNOSUPPORT;
+
+        r = safe_atou8(p, &u);
+        if (r < 0)
+                return r;
+
+        if (u > FAMILY_ADDRESS_SIZE(family) * 8)
+                return -ERANGE;
+
+        *ret = u;
+        return 0;
+}
+
+int in_addr_prefix_from_string(
+                const char *p,
+                int family,
+                union in_addr_union *ret_prefix,
+                unsigned char *ret_prefixlen) {
+
+        _cleanup_free_ char *str = NULL;
+        union in_addr_union buffer;
+        const char *e, *l;
+        unsigned char k;
+        int r;
+
+        assert(p);
+
+        if (!IN_SET(family, AF_INET, AF_INET6))
+                return -EAFNOSUPPORT;
+
+        e = strchr(p, '/');
+        if (e) {
+                str = strndup(p, e - p);
+                if (!str)
+                        return -ENOMEM;
+
+                l = str;
+        } else
+                l = p;
+
+        r = in_addr_from_string(family, l, &buffer);
+        if (r < 0)
+                return r;
+
+        if (e) {
+                r = in_addr_parse_prefixlen(family, e+1, &k);
+                if (r < 0)
+                        return r;
+        } else
+                k = FAMILY_ADDRESS_SIZE(family) * 8;
+
+        if (ret_prefix)
+                *ret_prefix = buffer;
+        if (ret_prefixlen)
+                *ret_prefixlen = k;
+
+        return 0;
+}
+
+int in_addr_prefix_from_string_auto_internal(
+                const char *p,
+                InAddrPrefixLenMode mode,
+                int *ret_family,
+                union in_addr_union *ret_prefix,
+                unsigned char *ret_prefixlen) {
+
+        _cleanup_free_ char *str = NULL;
+        union in_addr_union buffer;
+        const char *e, *l;
+        unsigned char k;
+        int family, r;
+
+        assert(p);
+
+        e = strchr(p, '/');
+        if (e) {
+                str = strndup(p, e - p);
+                if (!str)
+                        return -ENOMEM;
+
+                l = str;
+        } else
+                l = p;
+
+        r = in_addr_from_string_auto(l, &family, &buffer);
+        if (r < 0)
+                return r;
+
+        if (e) {
+                r = in_addr_parse_prefixlen(family, e+1, &k);
+                if (r < 0)
+                        return r;
+        } else
+                switch (mode) {
+                case PREFIXLEN_FULL:
+                        k = FAMILY_ADDRESS_SIZE(family) * 8;
+                        break;
+                case PREFIXLEN_REFUSE:
+                        return -ENOANO; /* To distinguish this error from others. */
+                case PREFIXLEN_LEGACY:
+                        if (family == AF_INET) {
+                                r = in4_addr_default_prefixlen(&buffer.in, &k);
+                                if (r < 0)
+                                        return r;
+                        } else
+                                k = 0;
+                        break;
+                default:
+                        assert_not_reached("Invalid prefixlen mode");
+                }
+
+        if (ret_family)
+                *ret_family = family;
+        if (ret_prefix)
+                *ret_prefix = buffer;
+        if (ret_prefixlen)
+                *ret_prefixlen = k;
+
+        return 0;
+
+}
+
+static void in_addr_data_hash_func(const struct in_addr_data *a, struct siphash *state) {
+        siphash24_compress(&a->family, sizeof(a->family), state);
+        siphash24_compress(&a->address, FAMILY_ADDRESS_SIZE(a->family), state);
+}
+
+static int in_addr_data_compare_func(const struct in_addr_data *x, const struct in_addr_data *y) {
+        int r;
+
+        r = CMP(x->family, y->family);
+        if (r != 0)
+                return r;
+
+        return memcmp(&x->address, &y->address, FAMILY_ADDRESS_SIZE(x->family));
+}
+
+DEFINE_HASH_OPS(in_addr_data_hash_ops, struct in_addr_data, in_addr_data_hash_func, in_addr_data_compare_func);