-/*
- * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
+/* -*- Mode: C; tab-width: 4 -*-
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
+ * Copyright (c) 2002-2018 Apple Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
* limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
-
- Change History (most recent first):
-
-$Log: mDNSUNP.c,v $
-Revision 1.12 2003/09/02 20:47:13 cheshire
-Fix signed/unsigned warning
-
-Revision 1.11 2003/08/12 19:56:26 cheshire
-Update to APSL 2.0
-
-Revision 1.10 2003/08/06 18:20:51 cheshire
-Makefile cleanup
-
-Revision 1.9 2003/07/14 18:11:54 cheshire
-Fix stricter compiler warnings
-
-Revision 1.8 2003/07/02 21:19:59 cheshire
-<rdar://problem/3313413> Update copyright notices, etc., in source code comments
-
-Revision 1.7 2003/03/20 21:10:31 cheshire
-Fixes done at IETF 56 to make mDNSProxyResponderPosix run on Solaris
-
-Revision 1.6 2003/03/13 03:46:21 cheshire
-Fixes to make the code build on Linux
-
-Revision 1.5 2003/02/07 03:02:02 cheshire
-Submitted by: Mitsutaka Watanabe
-The code saying "index += 1;" was effectively making up random interface index values.
-The right way to find the correct interface index is if_nametoindex();
-
-Revision 1.4 2002/12/23 22:13:31 jgraessl
-
-Reviewed by: Stuart Cheshire
-Initial IPv6 support for mDNSResponder.
-
-Revision 1.3 2002/09/21 20:44:53 zarzycki
-Added APSL info
-
-Revision 1.2 2002/09/19 04:20:44 cheshire
-Remove high-ascii characters that confuse some systems
-
-Revision 1.1 2002/09/17 06:24:34 cheshire
-First checkin
-
-*/
+ */
#include "mDNSUNP.h"
#include <stdlib.h>
#include <sys/uio.h>
#include <sys/ioctl.h>
+#include <signal.h>
#include <unistd.h>
#include <stdio.h>
-/* Solaris defined SIOCGIFCONF etc in <sys/sockio.h> but
- other platforms don't even have that include file. So,
- if we haven't yet got a definition, let's try to find
- <sys/sockio.h>.
-*/
-
-#ifndef SIOCGIFCONF
- #include <sys/sockio.h>
+/* Some weird platforms derived from 4.4BSD Lite (e.g. EFI) need the ALIGN(P)
+ macro, usually defined in <sys/param.h> or someplace like that, to make sure the
+ CMSG_NXTHDR macro is well-formed. On such platforms, the symbol NEED_ALIGN_MACRO
+ should be set to the name of the header to include to get the ALIGN(P) macro.
+ */
+#ifdef NEED_ALIGN_MACRO
+#include NEED_ALIGN_MACRO
#endif
-/* sockaddr_dl is only referenced if we're using IP_RECVIF,
+/* sockaddr_dl is only referenced if we're using IP_RECVIF,
so only include the header in that case.
-*/
+ */
#ifdef IP_RECVIF
#include <net/if_dl.h>
#endif
-
-struct ifi_info *get_ifi_info(int family, int doaliases)
-{
- int junk;
- struct ifi_info *ifi, *ifihead, **ifipnext;
- int sockfd, len, lastlen, flags, myflags;
- char *ptr, *buf, lastname[IFNAMSIZ], *cptr;
- struct ifconf ifc;
- struct ifreq *ifr, ifrcopy;
- struct sockaddr_in *sinptr;
-
-#if defined(AF_INET6) && defined(HAVE_IPV6)
- struct sockaddr_in6 *sinptr6;
-#endif
-
- sockfd = -1;
- buf = NULL;
- ifihead = NULL;
-
- sockfd = socket(AF_INET, SOCK_DGRAM, 0);
- if (sockfd < 0) {
- goto gotError;
- }
-
- lastlen = 0;
- len = 100 * sizeof(struct ifreq); /* initial buffer size guess */
- for ( ; ; ) {
- buf = malloc(len);
- if (buf == NULL) {
- goto gotError;
- }
- ifc.ifc_len = len;
- ifc.ifc_buf = buf;
- if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
- if (errno != EINVAL || lastlen != 0) {
- goto gotError;
- }
- } else {
- if (ifc.ifc_len == lastlen)
- break; /* success, len has not changed */
- lastlen = ifc.ifc_len;
- }
- len += 10 * sizeof(struct ifreq); /* increment */
- free(buf);
- }
- ifihead = NULL;
- ifipnext = &ifihead;
- lastname[0] = 0;
-/* end get_ifi_info1 */
-
-/* include get_ifi_info2 */
- for (ptr = buf; ptr < buf + ifc.ifc_len; ) {
- ifr = (struct ifreq *) ptr;
-
- len = GET_SA_LEN(ifr->ifr_addr);
- ptr += sizeof(ifr->ifr_name) + len; /* for next one in buffer */
-
-// fprintf(stderr, "intf %d name=%s AF=%d\n", index, ifr->ifr_name, ifr->ifr_addr.sa_family);
-
- if (ifr->ifr_addr.sa_family != family)
- continue; /* ignore if not desired address family */
-
- myflags = 0;
- if ( (cptr = strchr(ifr->ifr_name, ':')) != NULL)
- *cptr = 0; /* replace colon will null */
- if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) {
- if (doaliases == 0)
- continue; /* already processed this interface */
- myflags = IFI_ALIAS;
- }
- memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
-
- ifrcopy = *ifr;
- if (ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy) < 0) {
- goto gotError;
- }
-
- flags = ifrcopy.ifr_flags;
- if ((flags & IFF_UP) == 0)
- continue; /* ignore if interface not up */
-
- ifi = calloc(1, sizeof(struct ifi_info));
- if (ifi == NULL) {
- goto gotError;
- }
- *ifipnext = ifi; /* prev points to this new one */
- ifipnext = &ifi->ifi_next; /* pointer to next one goes here */
-
- ifi->ifi_flags = flags; /* IFF_xxx values */
- ifi->ifi_myflags = myflags; /* IFI_xxx values */
- ifi->ifi_index = if_nametoindex(ifr->ifr_name);
- memcpy(ifi->ifi_name, ifr->ifr_name, IFI_NAME);
- ifi->ifi_name[IFI_NAME-1] = '\0';
-/* end get_ifi_info2 */
-/* include get_ifi_info3 */
- switch (ifr->ifr_addr.sa_family) {
- case AF_INET:
- sinptr = (struct sockaddr_in *) &ifr->ifr_addr;
- if (ifi->ifi_addr == NULL) {
- ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in));
- if (ifi->ifi_addr == NULL) {
- goto gotError;
- }
- memcpy(ifi->ifi_addr, sinptr, sizeof(struct sockaddr_in));
-
-#ifdef SIOCGIFBRDADDR
- if (flags & IFF_BROADCAST) {
- if (ioctl(sockfd, SIOCGIFBRDADDR, &ifrcopy) < 0) {
- goto gotError;
- }
- sinptr = (struct sockaddr_in *) &ifrcopy.ifr_broadaddr;
- ifi->ifi_brdaddr = calloc(1, sizeof(struct sockaddr_in));
- if (ifi->ifi_brdaddr == NULL) {
- goto gotError;
- }
- memcpy(ifi->ifi_brdaddr, sinptr, sizeof(struct sockaddr_in));
- }
-#endif
-
-#ifdef SIOCGIFDSTADDR
- if (flags & IFF_POINTOPOINT) {
- if (ioctl(sockfd, SIOCGIFDSTADDR, &ifrcopy) < 0) {
- goto gotError;
- }
- sinptr = (struct sockaddr_in *) &ifrcopy.ifr_dstaddr;
- ifi->ifi_dstaddr = calloc(1, sizeof(struct sockaddr_in));
- if (ifi->ifi_dstaddr == NULL) {
- goto gotError;
- }
- memcpy(ifi->ifi_dstaddr, sinptr, sizeof(struct sockaddr_in));
- }
-#endif
- }
- break;
-
-#if defined(AF_INET6) && defined(HAVE_IPV6)
- case AF_INET6:
- sinptr6 = (struct sockaddr_in6 *) &ifr->ifr_addr;
- if (ifi->ifi_addr == NULL) {
- ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6));
- if (ifi->ifi_addr == NULL) {
- goto gotError;
- }
-
- /* Some platforms (*BSD) inject the prefix in IPv6LL addresses */
- /* We need to strip that out */
- if (IN6_IS_ADDR_LINKLOCAL(&sinptr6->sin6_addr))
- sinptr6->sin6_addr.__u6_addr.__u6_addr16[1] = 0;
- memcpy(ifi->ifi_addr, sinptr6, sizeof(struct sockaddr_in6));
- }
- break;
-#endif
-
- default:
- break;
- }
- }
- goto done;
-
-gotError:
- if (ifihead != NULL) {
- free_ifi_info(ifihead);
- ifihead = NULL;
- }
-
-done:
- if (buf != NULL) {
- free(buf);
- }
- if (sockfd != -1) {
- junk = close(sockfd);
- assert(junk == 0);
- }
- return(ifihead); /* pointer to first structure in linked list */
-}
-/* end get_ifi_info3 */
-
-/* include free_ifi_info */
-void
-free_ifi_info(struct ifi_info *ifihead)
-{
- struct ifi_info *ifi, *ifinext;
-
- for (ifi = ifihead; ifi != NULL; ifi = ifinext) {
- if (ifi->ifi_addr != NULL)
- free(ifi->ifi_addr);
- if (ifi->ifi_brdaddr != NULL)
- free(ifi->ifi_brdaddr);
- if (ifi->ifi_dstaddr != NULL)
- free(ifi->ifi_dstaddr);
- ifinext = ifi->ifi_next; /* can't fetch ifi_next after free() */
- free(ifi); /* the ifi_info{} itself */
- }
-}
-/* end free_ifi_info */
-
-ssize_t
+ssize_t
recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp,
- struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp)
+ struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp, u_char *ttl)
{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t n;
+ struct msghdr msg;
+ struct iovec iov[1];
+ ssize_t n;
#ifdef CMSG_FIRSTHDR
struct cmsghdr *cmptr;
union {
- struct cmsghdr cm;
- char control[1024];
+ struct cmsghdr cm;
+ char control[1024];
} control_un;
+ *ttl = 255; // If kernel fails to provide TTL data then assume the TTL was 255 as it should be
+
msg.msg_control = control_un.control;
msg.msg_controllen = sizeof(control_un.control);
msg.msg_flags = 0;
memset(&msg, 0, sizeof(msg)); /* make certain msg_accrightslen = 0 */
#endif /* CMSG_FIRSTHDR */
- msg.msg_name = (void *) sa;
+ msg.msg_name = (char *) sa;
msg.msg_namelen = *salenptr;
- iov[0].iov_base = ptr;
+ iov[0].iov_base = (char *)ptr;
iov[0].iov_len = nbytes;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
*salenptr = msg.msg_namelen; /* pass back results */
if (pktp) {
/* 0.0.0.0, i/f = -1 */
- /* We set the interface to -1 so that the caller can
- tell whether we returned a meaningful value or
- just some default. Previously this code just
- set the value to 0, but I'm concerned that 0
+ /* We set the interface to -1 so that the caller can
+ tell whether we returned a meaningful value or
+ just some default. Previously this code just
+ set the value to 0, but I'm concerned that 0
might be a valid interface value.
- */
+ */
memset(pktp, 0, sizeof(struct my_in_pktinfo));
pktp->ipi_ifindex = -1;
}
/* include recvfrom_flags2 */
#ifndef CMSG_FIRSTHDR
- #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc.
+ #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc.
*flagsp = 0; /* pass back results */
return(n);
#else
#ifdef IP_PKTINFO
#if in_pktinfo_definition_is_missing
-struct in_pktinfo
-{
- int ipi_ifindex;
- struct in_addr ipi_spec_dst;
- struct in_addr ipi_addr;
-};
+ struct in_pktinfo
+ {
+ int ipi_ifindex;
+ struct in_addr ipi_spec_dst;
+ struct in_addr ipi_addr;
+ };
#endif
- if (cmptr->cmsg_level == IPPROTO_IP &&
+ if (cmptr->cmsg_level == IPPROTO_IP &&
cmptr->cmsg_type == IP_PKTINFO) {
struct in_pktinfo *tmp;
struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr;
-
+
tmp = (struct in_pktinfo *) CMSG_DATA(cmptr);
sin->sin_family = AF_INET;
sin->sin_addr = tmp->ipi_addr;
if (cmptr->cmsg_level == IPPROTO_IP &&
cmptr->cmsg_type == IP_RECVDSTADDR) {
struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr;
-
+
sin->sin_family = AF_INET;
sin->sin_addr = *(struct in_addr*)CMSG_DATA(cmptr);
sin->sin_port = 0;
if (cmptr->cmsg_level == IPPROTO_IP &&
cmptr->cmsg_type == IP_RECVIF) {
struct sockaddr_dl *sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr);
- int nameLen = (sdl->sdl_nlen < IFI_NAME - 1) ? sdl->sdl_nlen : (IFI_NAME - 1);
- pktp->ipi_ifindex = sdl->sdl_index;
#ifndef HAVE_BROKEN_RECVIF_NAME
+ int nameLen = (sdl->sdl_nlen < IFI_NAME - 1) ? sdl->sdl_nlen : (IFI_NAME - 1);
strncpy(pktp->ipi_ifname, sdl->sdl_data, nameLen);
+#endif
+ pktp->ipi_ifindex = sdl->sdl_index;
+#ifdef HAVE_BROKEN_RECVIF_NAME
+ if (sdl->sdl_index == 0) {
+ pktp->ipi_ifindex = *(uint_t*)sdl;
+ }
#endif
assert(pktp->ipi_ifname[IFI_NAME - 1] == 0);
// null terminated because of memset above
}
#endif
-#if defined(IPV6_PKTINFO) && defined(HAVE_IPV6)
- if (cmptr->cmsg_level == IPPROTO_IPV6 &&
- cmptr->cmsg_type == IPV6_PKTINFO) {
+#ifdef IP_RECVTTL
+ if (cmptr->cmsg_level == IPPROTO_IP &&
+ cmptr->cmsg_type == IP_RECVTTL) {
+ *ttl = *(u_char*)CMSG_DATA(cmptr);
+ continue;
+ }
+ else if (cmptr->cmsg_level == IPPROTO_IP &&
+ cmptr->cmsg_type == IP_TTL) { // some implementations seem to send IP_TTL instead of IP_RECVTTL
+ *ttl = *(int*)CMSG_DATA(cmptr);
+ continue;
+ }
+#endif
+
+#if defined(IPV6_PKTINFO) && HAVE_IPV6
+ if (cmptr->cmsg_level == IPPROTO_IPV6 &&
+ cmptr->cmsg_type == IPV6_2292_PKTINFO) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&pktp->ipi_addr;
- struct in6_pktinfo *ip6_info = (struct in6_pktinfo*)CMSG_DATA(cmptr);
-
+ struct in6_pktinfo *ip6_info = (struct in6_pktinfo*)CMSG_DATA(cmptr);
+
sin6->sin6_family = AF_INET6;
+#ifndef NOT_HAVE_SA_LEN
sin6->sin6_len = sizeof(*sin6);
+#endif
sin6->sin6_addr = ip6_info->ipi6_addr;
sin6->sin6_flowinfo = 0;
sin6->sin6_scope_id = 0;
sin6->sin6_port = 0;
- pktp->ipi_ifindex = ip6_info->ipi6_ifindex;
+ pktp->ipi_ifindex = ip6_info->ipi6_ifindex;
+ continue;
+ }
+#endif
+
+#if defined(IPV6_HOPLIMIT) && HAVE_IPV6
+ if (cmptr->cmsg_level == IPPROTO_IPV6 &&
+ cmptr->cmsg_type == IPV6_2292_HOPLIMIT) {
+ *ttl = *(int*)CMSG_DATA(cmptr);
continue;
}
#endif
return(n);
#endif /* CMSG_FIRSTHDR */
}
+
+// **********************************************************************************************
+
+// daemonize the process. Adapted from "Unix Network Programming" vol 1 by Stevens, section 12.4.
+// Returns 0 on success, -1 on failure.
+
+#ifdef NOT_HAVE_DAEMON
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/signal.h>
+
+int daemon(int nochdir, int noclose)
+{
+ switch (fork())
+ {
+ case -1: return (-1); // Fork failed
+ case 0: break; // Child -- continue
+ default: _exit(0); // Parent -- exit
+ }
+
+ if (setsid() == -1) return(-1);
+
+ signal(SIGHUP, SIG_IGN);
+
+ switch (fork()) // Fork again, primarily for reasons of Unix trivia
+ {
+ case -1: return (-1); // Fork failed
+ case 0: break; // Child -- continue
+ default: _exit(0); // Parent -- exit
+ }
+
+ if (!nochdir) (void)chdir("/");
+ umask(0);
+
+ if (!noclose)
+ {
+ int fd = open("/dev/null", O_RDWR, 0);
+ if (fd != -1)
+ {
+ // Avoid unnecessarily duplicating a file descriptor to itself
+ if (fd != STDIN_FILENO) (void)dup2(fd, STDIN_FILENO);
+ if (fd != STDOUT_FILENO) (void)dup2(fd, STDOUT_FILENO);
+ if (fd != STDERR_FILENO) (void)dup2(fd, STDERR_FILENO);
+ if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO)
+ (void)close (fd);
+ }
+ }
+ return (0);
+}
+#endif /* NOT_HAVE_DAEMON */
projects / apple / mdnsresponder.git / blobdiff