shared: split out in_addr related calls from socket-util.[ch] into its private in-addr-util.[ch]

These are enough calls for a new file, and they are sufficiently
different from the sockaddr-related calls, hence let's split this out.

4 files changed, 255 insertions, 204 deletions

diff --git a/src/shared/in-addr-util.c b/src/shared/in-addr-util.c
new file mode 100644
index 000000000..98d2446e5
--- /dev/null
+++ b/src/shared/in-addr-util.c
@@ -0,0 +1,211 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  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 "in-addr-util.h"
+
+int in_addr_null(unsigned family, union in_addr_union *u) {
+        assert(u);
+
+        if (family == AF_INET)
+                return u->in.s_addr == 0;
+
+        if (family == AF_INET6)
+                return
+                        u->in6.s6_addr32[0] == 0 &&
+                        u->in6.s6_addr32[1] == 0 &&
+                        u->in6.s6_addr32[2] == 0 &&
+                        u->in6.s6_addr32[3] == 0;
+
+        return -EAFNOSUPPORT;
+}
+
+
+int in_addr_equal(unsigned family, union in_addr_union *a, 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(
+                unsigned 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(unsigned 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(unsigned 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 ? -errno : -EINVAL;
+        }
+
+        *ret = x;
+        return 0;
+}
+
+int in_addr_from_string(unsigned 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 ? -errno : -EINVAL;
+
+        return 0;
+}
diff --git a/src/shared/in-addr-util.h b/src/shared/in-addr-util.h
new file mode 100644
index 000000000..ae3aa9021
--- /dev/null
+++ b/src/shared/in-addr-util.h
@@ -0,0 +1,44 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <netinet/in.h>
+
+#include "macro.h"
+#include "util.h"
+
+union in_addr_union {
+        struct in_addr in;
+        struct in6_addr in6;
+};
+
+int in_addr_null(unsigned family, union in_addr_union *u);
+int in_addr_equal(unsigned family, union in_addr_union *a, union in_addr_union *b);
+int in_addr_prefix_intersect(unsigned family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
+int in_addr_prefix_next(unsigned family, union in_addr_union *u, unsigned prefixlen);
+int in_addr_to_string(unsigned family, const union in_addr_union *u, char **ret);
+int in_addr_from_string(unsigned family, const char *s, union in_addr_union *ret);
+
+static inline size_t PROTO_ADDRESS_SIZE(int proto) {
+        assert(proto == AF_INET || proto == AF_INET6);
+        return proto == AF_INET6 ? 16 : 4;
+}
diff --git a/src/shared/socket-util.c b/src/shared/socket-util.c
index 6f4979853..92564e319 100644
--- a/src/shared/socket-util.c
+++ b/src/shared/socket-util.c
@@ -640,193 +640,6 @@ int socket_address_unlink(SocketAddress *a) {
         return 1;
 }
 
-int in_addr_null(unsigned family, union in_addr_union *u) {
-        assert(u);
-
-        if (family == AF_INET)
-                return u->in.s_addr == 0;
-
-        if (family == AF_INET6)
-                return
-                        u->in6.s6_addr32[0] == 0 &&
-                        u->in6.s6_addr32[1] == 0 &&
-                        u->in6.s6_addr32[2] == 0 &&
-                        u->in6.s6_addr32[3] == 0;
-
-        return -EAFNOSUPPORT;
-}
-
-
-int in_addr_equal(unsigned family, union in_addr_union *a, 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(
-                unsigned 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(unsigned 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(unsigned 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 ? -errno : -EINVAL;
-        }
-
-        *ret = x;
-        return 0;
-}
-
-int in_addr_from_string(unsigned 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 ? -errno : -EINVAL;
-
-        return 0;
-}
-
 static const char* const netlink_family_table[] = {
         [NETLINK_ROUTE] = "route",
         [NETLINK_FIREWALL] = "firewall",
diff --git a/src/shared/socket-util.h b/src/shared/socket-util.h
index 8d521ae1a..ec85d949c 100644
--- a/src/shared/socket-util.h
+++ b/src/shared/socket-util.h
@@ -41,11 +41,6 @@ union sockaddr_union {
         struct sockaddr_ll ll;
 };
 
-union in_addr_union {
-        struct in_addr in;
-        struct in6_addr in6;
-};
-
 typedef struct SocketAddress {
         union sockaddr_union sockaddr;
 
@@ -111,15 +106,3 @@ SocketAddressBindIPv6Only socket_address_bind_ipv6_only_from_string(const char *
 
 int netlink_family_to_string_alloc(int b, char **s);
 int netlink_family_from_string(const char *s) _pure_;
-
-int in_addr_null(unsigned family, union in_addr_union *u);
-int in_addr_equal(unsigned family, union in_addr_union *a, union in_addr_union *b);
-int in_addr_prefix_intersect(unsigned family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
-int in_addr_prefix_next(unsigned family, union in_addr_union *u, unsigned prefixlen);
-int in_addr_to_string(unsigned family, const union in_addr_union *u, char **ret);
-int in_addr_from_string(unsigned family, const char *s, union in_addr_union *ret);
-
-static inline size_t PROTO_ADDRESS_SIZE(int proto) {
-        assert(proto == AF_INET || proto == AF_INET6);
-        return proto == AF_INET6 ? 16 : 4;
-}