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- /* $OpenBSD: addr.c,v 1.8 2024/04/02 09:29:31 deraadt Exp $ */
-
- /*
- * Copyright (c) 2004-2008 Damien Miller <djm@mindrot.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
- #include "includes.h"
-
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
-
- #include <netdb.h>
- #include <string.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <limits.h>
-
- #include "addr.h"
-
- #define _SA(x) ((struct sockaddr *)(x))
-
- int
- addr_unicast_masklen(int af)
- {
- switch (af) {
- case AF_INET:
- return 32;
- case AF_INET6:
- return 128;
- default:
- return -1;
- }
- }
-
- static inline int
- masklen_valid(int af, u_int masklen)
- {
- switch (af) {
- case AF_INET:
- return masklen <= 32 ? 0 : -1;
- case AF_INET6:
- return masklen <= 128 ? 0 : -1;
- default:
- return -1;
- }
- }
-
- int
- addr_xaddr_to_sa(const struct xaddr *xa, struct sockaddr *sa, socklen_t *len,
- u_int16_t port)
- {
- struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
- struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
-
- if (xa == NULL || sa == NULL || len == NULL)
- return -1;
-
- switch (xa->af) {
- case AF_INET:
- if (*len < sizeof(*in4))
- return -1;
- memset(sa, '\0', sizeof(*in4));
- *len = sizeof(*in4);
- #ifdef SOCK_HAS_LEN
- in4->sin_len = sizeof(*in4);
- #endif
- in4->sin_family = AF_INET;
- in4->sin_port = htons(port);
- memcpy(&in4->sin_addr, &xa->v4, sizeof(in4->sin_addr));
- break;
- case AF_INET6:
- if (*len < sizeof(*in6))
- return -1;
- memset(sa, '\0', sizeof(*in6));
- *len = sizeof(*in6);
- #ifdef SOCK_HAS_LEN
- in6->sin6_len = sizeof(*in6);
- #endif
- in6->sin6_family = AF_INET6;
- in6->sin6_port = htons(port);
- memcpy(&in6->sin6_addr, &xa->v6, sizeof(in6->sin6_addr));
- #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
- in6->sin6_scope_id = xa->scope_id;
- #endif
- break;
- default:
- return -1;
- }
- return 0;
- }
-
- /*
- * Convert struct sockaddr to struct xaddr
- * Returns 0 on success, -1 on failure.
- */
- int
- addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa)
- {
- struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
- struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
-
- memset(xa, '\0', sizeof(*xa));
-
- switch (sa->sa_family) {
- case AF_INET:
- if (slen < (socklen_t)sizeof(*in4))
- return -1;
- xa->af = AF_INET;
- memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
- break;
- case AF_INET6:
- if (slen < (socklen_t)sizeof(*in6))
- return -1;
- xa->af = AF_INET6;
- memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
- #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
- xa->scope_id = in6->sin6_scope_id;
- #endif
- break;
- default:
- return -1;
- }
-
- return 0;
- }
-
- int
- addr_invert(struct xaddr *n)
- {
- int i;
-
- if (n == NULL)
- return -1;
-
- switch (n->af) {
- case AF_INET:
- n->v4.s_addr = ~n->v4.s_addr;
- return 0;
- case AF_INET6:
- for (i = 0; i < 4; i++)
- n->addr32[i] = ~n->addr32[i];
- return 0;
- default:
- return -1;
- }
- }
-
- /*
- * Calculate a netmask of length 'l' for address family 'af' and
- * store it in 'n'.
- * Returns 0 on success, -1 on failure.
- */
- int
- addr_netmask(int af, u_int l, struct xaddr *n)
- {
- int i;
-
- if (masklen_valid(af, l) != 0 || n == NULL)
- return -1;
-
- memset(n, '\0', sizeof(*n));
- switch (af) {
- case AF_INET:
- n->af = AF_INET;
- if (l == 0)
- return 0;
- n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
- return 0;
- case AF_INET6:
- n->af = AF_INET6;
- for (i = 0; i < 4 && l >= 32; i++, l -= 32)
- n->addr32[i] = 0xffffffffU;
- if (i < 4 && l != 0)
- n->addr32[i] = htonl((0xffffffff << (32 - l)) &
- 0xffffffff);
- return 0;
- default:
- return -1;
- }
- }
-
- int
- addr_hostmask(int af, u_int l, struct xaddr *n)
- {
- if (addr_netmask(af, l, n) == -1 || addr_invert(n) == -1)
- return -1;
- return 0;
- }
-
- /*
- * Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
- * Returns 0 on success, -1 on failure.
- */
- int
- addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
- {
- int i;
-
- if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
- return -1;
-
- memcpy(dst, a, sizeof(*dst));
- switch (a->af) {
- case AF_INET:
- dst->v4.s_addr &= b->v4.s_addr;
- return 0;
- case AF_INET6:
- dst->scope_id = a->scope_id;
- for (i = 0; i < 4; i++)
- dst->addr32[i] &= b->addr32[i];
- return 0;
- default:
- return -1;
- }
- }
-
- int
- addr_or(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
- {
- int i;
-
- if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
- return (-1);
-
- memcpy(dst, a, sizeof(*dst));
- switch (a->af) {
- case AF_INET:
- dst->v4.s_addr |= b->v4.s_addr;
- return (0);
- case AF_INET6:
- for (i = 0; i < 4; i++)
- dst->addr32[i] |= b->addr32[i];
- return (0);
- default:
- return (-1);
- }
- }
-
- int
- addr_cmp(const struct xaddr *a, const struct xaddr *b)
- {
- int i;
-
- if (a->af != b->af)
- return (a->af == AF_INET6 ? 1 : -1);
-
- switch (a->af) {
- case AF_INET:
- /*
- * Can't just subtract here as 255.255.255.255 - 0.0.0.0 is
- * too big to fit into a signed int
- */
- if (a->v4.s_addr == b->v4.s_addr)
- return 0;
- return (ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1);
- case AF_INET6:
- /*
- * Do this a byte at a time to avoid the above issue and
- * any endian problems
- */
- for (i = 0; i < 16; i++)
- if (a->addr8[i] - b->addr8[i] != 0)
- return (a->addr8[i] - b->addr8[i]);
- if (a->scope_id == b->scope_id)
- return (0);
- return (a->scope_id > b->scope_id ? 1 : -1);
- default:
- return (-1);
- }
- }
-
- int
- addr_is_all0s(const struct xaddr *a)
- {
- int i;
-
- switch (a->af) {
- case AF_INET:
- return (a->v4.s_addr == 0 ? 0 : -1);
- case AF_INET6:
- for (i = 0; i < 4; i++)
- if (a->addr32[i] != 0)
- return -1;
- return 0;
- default:
- return -1;
- }
- }
-
- /* Increment the specified address. Note, does not do overflow checking */
- void
- addr_increment(struct xaddr *a)
- {
- int i;
- uint32_t n;
-
- switch (a->af) {
- case AF_INET:
- a->v4.s_addr = htonl(ntohl(a->v4.s_addr) + 1);
- break;
- case AF_INET6:
- for (i = 0; i < 4; i++) {
- /* Increment with carry */
- n = ntohl(a->addr32[3 - i]) + 1;
- a->addr32[3 - i] = htonl(n);
- if (n != 0)
- break;
- }
- break;
- }
- }
-
- /*
- * Test whether host portion of address 'a', as determined by 'masklen'
- * is all zeros.
- * Returns 0 if host portion of address is all-zeros,
- * -1 if not all zeros or on failure.
- */
- int
- addr_host_is_all0s(const struct xaddr *a, u_int masklen)
- {
- struct xaddr tmp_addr, tmp_mask, tmp_result;
-
- memcpy(&tmp_addr, a, sizeof(tmp_addr));
- if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
- return -1;
- if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
- return -1;
- return addr_is_all0s(&tmp_result);
- }
-
- #if 0
- int
- addr_host_to_all0s(struct xaddr *a, u_int masklen)
- {
- struct xaddr tmp_mask;
-
- if (addr_netmask(a->af, masklen, &tmp_mask) == -1)
- return (-1);
- if (addr_and(a, a, &tmp_mask) == -1)
- return (-1);
- return (0);
- }
- #endif
-
- int
- addr_host_to_all1s(struct xaddr *a, u_int masklen)
- {
- struct xaddr tmp_mask;
-
- if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
- return (-1);
- if (addr_or(a, a, &tmp_mask) == -1)
- return (-1);
- return (0);
- }
-
- /*
- * Parse string address 'p' into 'n'.
- * Returns 0 on success, -1 on failure.
- */
- int
- addr_pton(const char *p, struct xaddr *n)
- {
- struct addrinfo hints, *ai;
-
- memset(&hints, '\0', sizeof(hints));
- hints.ai_flags = AI_NUMERICHOST;
-
- if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
- return -1;
-
- if (ai == NULL)
- return -1;
-
- if (ai->ai_addr == NULL) {
- freeaddrinfo(ai);
- return -1;
- }
-
- if (n != NULL && addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen,
- n) == -1) {
- freeaddrinfo(ai);
- return -1;
- }
-
- freeaddrinfo(ai);
- return 0;
- }
-
- int
- addr_sa_pton(const char *h, const char *s, struct sockaddr *sa, socklen_t slen)
- {
- struct addrinfo hints, *ai;
-
- memset(&hints, '\0', sizeof(hints));
- hints.ai_flags = AI_NUMERICHOST;
-
- if (h == NULL || getaddrinfo(h, s, &hints, &ai) != 0)
- return -1;
-
- if (ai == NULL)
- return -1;
-
- if (ai->ai_addr == NULL) {
- freeaddrinfo(ai);
- return -1;
- }
-
- if (sa != NULL) {
- if (slen < ai->ai_addrlen) {
- freeaddrinfo(ai);
- return -1;
- }
- memcpy(sa, &ai->ai_addr, ai->ai_addrlen);
- }
-
- freeaddrinfo(ai);
- return 0;
- }
-
- int
- addr_ntop(const struct xaddr *n, char *p, size_t len)
- {
- struct sockaddr_storage ss;
- socklen_t slen = sizeof(ss);
-
- if (addr_xaddr_to_sa(n, _SA(&ss), &slen, 0) == -1)
- return -1;
- if (p == NULL || len == 0)
- return -1;
- if (getnameinfo(_SA(&ss), slen, p, len, NULL, 0,
- NI_NUMERICHOST) != 0)
- return -1;
-
- return 0;
- }
-
- /*
- * Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
- * Return -1 on parse error, -2 on inconsistency or 0 on success.
- */
- int
- addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
- {
- struct xaddr tmp;
- u_int masklen = 999;
- char addrbuf[64], *mp;
- const char *errstr;
-
- /* Don't modify argument */
- if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) >= sizeof(addrbuf))
- return -1;
-
- if ((mp = strchr(addrbuf, '/')) != NULL) {
- *mp = '\0';
- mp++;
- masklen = (u_int)strtonum(mp, 0, INT_MAX, &errstr);
- if (errstr)
- return -1;
- }
-
- if (addr_pton(addrbuf, &tmp) == -1)
- return -1;
-
- if (mp == NULL)
- masklen = addr_unicast_masklen(tmp.af);
- if (masklen_valid(tmp.af, masklen) == -1)
- return -2;
- if (addr_host_is_all0s(&tmp, masklen) != 0)
- return -2;
-
- if (n != NULL)
- memcpy(n, &tmp, sizeof(*n));
- if (l != NULL)
- *l = masklen;
-
- return 0;
- }
-
- int
- addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
- {
- struct xaddr tmp_mask, tmp_result;
-
- if (host->af != net->af)
- return -1;
-
- if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
- return -1;
- if (addr_and(&tmp_result, host, &tmp_mask) == -1)
- return -1;
- return addr_cmp(&tmp_result, net);
- }
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