/* $NetBSD: interfaceiter.c,v 1.2 2024/08/18 20:47:16 christos Exp $ */ /* * Copyright (C) 2004, 2005, 2007, 2008 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1999-2003 Internet Software Consortium. * * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC 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. */ /* Id: interfaceiter.c,v 1.45 2008/12/01 03:51:47 marka Exp */ /*! \file */ #include #include #include #ifdef HAVE_SYS_SOCKIO_H #include /* Required for ifiter_ioctl.c. */ #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Must follow . */ #ifdef HAVE_NET_IF6_H #include #endif #include #ifdef HAVE_LINUX_IF_ADDR_H # include #endif /* Common utility functions */ /*% * Extract the network address part from a "struct sockaddr". * \brief * The address family is given explicitly * instead of using src->sa_family, because the latter does not work * for copying a network mask obtained by SIOCGIFNETMASK (it does * not have a valid address family). */ static void get_addr(unsigned int family, isc_netaddr_t *dst, struct sockaddr *src, char *ifname) { struct sockaddr_in6 *sa6; #if !defined(ISC_PLATFORM_HAVEIFNAMETOINDEX) || \ !defined(ISC_PLATFORM_HAVESCOPEID) UNUSED(ifname); #endif /* clear any remaining value for safety */ memset(dst, 0, sizeof(*dst)); dst->family = family; switch (family) { case AF_INET: memcpy(&dst->type.in, &((struct sockaddr_in *)(void *)src)->sin_addr, sizeof(struct in_addr)); break; case AF_INET6: sa6 = (struct sockaddr_in6 *)(void *)src; memcpy(&dst->type.in6, &sa6->sin6_addr, sizeof(struct in6_addr)); #ifdef ISC_PLATFORM_HAVESCOPEID if (sa6->sin6_scope_id != 0) isc_netaddr_setzone(dst, sa6->sin6_scope_id); else { /* * BSD variants embed scope zone IDs in the 128bit * address as a kernel internal form. Unfortunately, * the embedded IDs are not hidden from applications * when getting access to them by sysctl or ioctl. * We convert the internal format to the pure address * part and the zone ID part. * Since multicast addresses should not appear here * and they cannot be distinguished from netmasks, * we only consider unicast link-local addresses. */ if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { isc_uint16_t zone16; memcpy(&zone16, &sa6->sin6_addr.s6_addr[2], sizeof(zone16)); zone16 = ntohs(zone16); if (zone16 != 0) { /* the zone ID is embedded */ isc_netaddr_setzone(dst, (isc_uint32_t)zone16); dst->type.in6.s6_addr[2] = 0; dst->type.in6.s6_addr[3] = 0; #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX } else if (ifname != NULL) { unsigned int zone; /* * sin6_scope_id is still not provided, * but the corresponding interface name * is know. Use the interface ID as * the link ID. */ zone = if_nametoindex(ifname); if (zone != 0) { isc_netaddr_setzone(dst, (isc_uint32_t)zone); } #endif } } } #endif break; default: INSIST(0); break; } } /* * Include system-dependent code. */ #ifdef __linux #define ISC_IF_INET6_SZ \ sizeof("00000000000000000000000000000001 01 80 10 80 XXXXXXloXXXXXXXX\n") static isc_result_t linux_if_inet6_next(isc_interfaceiter_t *); static isc_result_t linux_if_inet6_current(isc_interfaceiter_t *); static void linux_if_inet6_first(isc_interfaceiter_t *iter); #endif #if HAVE_GETIFADDRS #include "ifiter_getifaddrs.c" #elif HAVE_IFLIST_SYSCTL #include "ifiter_sysctl.c" #else #include "ifiter_ioctl.c" #endif #ifdef __linux static void linux_if_inet6_first(isc_interfaceiter_t *iter) { if (iter->proc != NULL) { rewind(iter->proc); (void)linux_if_inet6_next(iter); } else iter->valid = ISC_R_NOMORE; } static isc_result_t linux_if_inet6_next(isc_interfaceiter_t *iter) { if (iter->proc != NULL && fgets(iter->entry, sizeof(iter->entry), iter->proc) != NULL) iter->valid = ISC_R_SUCCESS; else iter->valid = ISC_R_NOMORE; return (iter->valid); } static isc_result_t linux_if_inet6_current(isc_interfaceiter_t *iter) { char address[33]; char name[IF_NAMESIZE+1]; struct in6_addr addr6; unsigned int ifindex; int prefix, scope, flags; int res; unsigned int i; if (iter->valid != ISC_R_SUCCESS) return (iter->valid); if (iter->proc == NULL) { isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL, ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR, "/proc/net/if_inet6:iter->proc == NULL"); return (ISC_R_FAILURE); } res = sscanf(iter->entry, "%32[a-f0-9] %x %x %x %x %16s\n", address, &ifindex, &prefix, &scope, &flags, name); if (res != 6) { isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL, ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR, "/proc/net/if_inet6:sscanf() -> %d (expected 6)", res); return (ISC_R_FAILURE); } if (strlen(address) != 32) { isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL, ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR, "/proc/net/if_inet6:strlen(%s) != 32", address); return (ISC_R_FAILURE); } /* ** Ignore DAD addresses -- ** we can't bind to them until they are resolved */ #ifdef IFA_F_TENTATIVE if (flags & IFA_F_TENTATIVE) return (ISC_R_IGNORE); #endif for (i = 0; i < 16; i++) { unsigned char byte; static const char hex[] = "0123456789abcdef"; byte = ((strchr(hex, address[i * 2]) - hex) << 4) | (strchr(hex, address[i * 2 + 1]) - hex); addr6.s6_addr[i] = byte; } iter->current.af = AF_INET6; iter->current.flags = INTERFACE_F_UP; isc_netaddr_fromin6(&iter->current.address, &addr6); iter->current.ifindex = ifindex; if (isc_netaddr_islinklocal(&iter->current.address)) { isc_netaddr_setzone(&iter->current.address, (isc_uint32_t)ifindex); } for (i = 0; i < 16; i++) { if (prefix > 8) { addr6.s6_addr[i] = 0xff; prefix -= 8; } else { addr6.s6_addr[i] = (0xff << (8 - prefix)) & 0xff; prefix = 0; } } isc_netaddr_fromin6(&iter->current.netmask, &addr6); strncpy(iter->current.name, name, sizeof(iter->current.name)); return (ISC_R_SUCCESS); } #endif /* * The remaining code is common to the sysctl and ioctl case. */ isc_result_t isc_interfaceiter_current(isc_interfaceiter_t *iter, isc_interface_t *ifdata) { REQUIRE(iter->result == ISC_R_SUCCESS); memcpy(ifdata, &iter->current, sizeof(*ifdata)); return (ISC_R_SUCCESS); } isc_result_t isc_interfaceiter_first(isc_interfaceiter_t *iter) { isc_result_t result; REQUIRE(VALID_IFITER(iter)); internal_first(iter); for (;;) { result = internal_current(iter); if (result != ISC_R_IGNORE) break; result = internal_next(iter); if (result != ISC_R_SUCCESS) break; } iter->result = result; return (result); } isc_result_t isc_interfaceiter_next(isc_interfaceiter_t *iter) { isc_result_t result; REQUIRE(VALID_IFITER(iter)); REQUIRE(iter->result == ISC_R_SUCCESS); for (;;) { result = internal_next(iter); if (result != ISC_R_SUCCESS) break; result = internal_current(iter); if (result != ISC_R_IGNORE) break; } iter->result = result; return (result); } void isc_interfaceiter_destroy(isc_interfaceiter_t **iterp) { isc_interfaceiter_t *iter; REQUIRE(iterp != NULL); iter = *iterp; REQUIRE(VALID_IFITER(iter)); internal_destroy(iter); if (iter->buf != NULL) isc_mem_put(iter->mctx, iter->buf, iter->bufsize); iter->magic = 0; isc_mem_put(iter->mctx, iter, sizeof(*iter)); *iterp = NULL; }