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[src/trunk]: src/external/apache2/mDNSResponder/dist/mDNSPosix Add a simpler ...
details: https://anonhg.NetBSD.org/src/rev/ed2c660ae23e
branches: trunk
changeset: 445952:ed2c660ae23e
user: christos <christos%NetBSD.org@localhost>
date: Sun Nov 18 18:55:49 2018 +0000
description:
Add a simpler version to do interface enumeration that uses getifaddrs(3)
diffstat:
external/apache2/mDNSResponder/dist/mDNSPosix/mDNSBSD.c | 314 ++++++++++++++++
external/apache2/mDNSResponder/dist/mDNSPosix/mDNSUNP.c | 8 +
2 files changed, 322 insertions(+), 0 deletions(-)
diffs (truncated from 338 to 300 lines):
diff -r 055761747539 -r ed2c660ae23e external/apache2/mDNSResponder/dist/mDNSPosix/mDNSBSD.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/external/apache2/mDNSResponder/dist/mDNSPosix/mDNSBSD.c Sun Nov 18 18:55:49 2018 +0000
@@ -0,0 +1,314 @@
+/* -*- Mode: C; tab-width: 4 -*-
+ *
+ * Copyright (c) 2002-2004 Apple Computer, 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.
+ */
+
+#include "mDNSUNP.h"
+#include <ifaddrs.h>
+
+#include <assert.h>
+#include <err.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <net/if_dl.h>
+
+static int
+copyaddr(struct sockaddr **dst, const struct sockaddr *src, socklen_t len)
+{
+ if (src == NULL)
+ return 1;
+
+ *dst = calloc(1, len);
+ if (*dst == NULL)
+ return 0;
+
+ memcpy(*dst, src, len);
+ return 1;
+}
+
+struct ifi_info *
+get_ifi_info(int family, int doaliases)
+{
+ struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr;
+ struct ifaddrs *ifal, *ifa;
+
+ if (getifaddrs(&ifal) == -1) {
+ warn("getifaddrs");
+ return NULL;
+ }
+
+ ifihead = NULL;
+ ifipnext = &ifihead;
+
+ for (ifa = ifal; ifa; ifa = ifa->ifa_next) {
+ struct sockaddr *sa = ifa->ifa_addr;
+ int flags = ifa->ifa_flags;
+ int addrflags = ifa->ifa_addrflags;
+
+#if 0
+ /*
+ * Include the loopback so that we return at least one
+ * address, so that mdnsd does not exit before we get
+ * a dhcp address
+ */
+ if (flags & IFF_LOOPBACK)
+ continue; /* ignore loopback interfaces */
+#endif
+
+ if ((flags & IFF_UP) == 0)
+ continue; /* ignore if interface not up */
+
+ if (sa == NULL || sa->sa_family != family)
+ continue; /* ignore if not the desired family */
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ if (addrflags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
+ continue;
+
+ break;
+#if defined(AF_INET6) && HAVE_IPV6
+ case AF_INET6:
+ if (addrflags & (IN6_IFF_NOTREADY | IN6_IFF_DETACHED))
+ continue;
+#endif
+ break;
+ default:
+ continue;
+ }
+
+ ifi = calloc(1, sizeof(*ifi));
+ if (ifi == NULL)
+ goto gotError;
+
+ ifipold = *ifipnext; /* need this later */
+ ifiptr = ifipnext;
+ *ifipnext = ifi; /* prev points to new one */
+ ifipnext = &ifi->ifi_next; /* pointer to next one */
+
+ ifi->ifi_flags = flags; /* IFF_xxx values */
+ ifi->ifi_myflags = 0; /* IFI_xxx values */
+ ifi->ifi_index = if_nametoindex(ifa->ifa_name);
+ memcpy(ifi->ifi_name, ifa->ifa_name, IFI_NAME);
+ ifi->ifi_name[IFI_NAME-1] = '\0';
+ if (!copyaddr(&ifi->ifi_addr, ifa->ifa_addr, sa->sa_len))
+ goto gotError;
+ if (!copyaddr(&ifi->ifi_netmask, ifa->ifa_netmask, sa->sa_len))
+ goto gotError;
+
+ if ((flags & IFF_BROADCAST) && !copyaddr(&ifi->ifi_brdaddr,
+ ifa->ifa_broadaddr, sa->sa_len))
+ goto gotError;
+ if ((flags & IFF_POINTOPOINT) && !copyaddr(&ifi->ifi_dstaddr,
+ ifa->ifa_dstaddr, sa->sa_len))
+ goto gotError;
+ }
+
+ goto done;
+
+gotError:
+ warn("can't allocate memory");
+ if (ifihead != NULL) {
+ free_ifi_info(ifihead);
+ ifihead = NULL;
+ }
+
+ freeifaddrs(ifal);
+done:
+ return ifihead; /* pointer to first structure in linked list */
+}
+
+void
+free_ifi_info(struct ifi_info *ifihead)
+{
+ struct ifi_info *ifi, *ififree;
+
+ for (ifi = ifihead; (ififree = ifi) != NULL;) {
+ free(ifi->ifi_addr);
+ free(ifi->ifi_netmask);
+ free(ifi->ifi_brdaddr);
+ free(ifi->ifi_dstaddr);
+ ifi = ifi->ifi_next;
+ free(ififree);
+ }
+}
+
+ssize_t
+recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp,
+ struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp,
+ u_char *ttl)
+{
+ struct msghdr msg;
+ struct iovec iov[1];
+ ssize_t n;
+
+#ifdef CMSG_FIRSTHDR
+ struct cmsghdr *cmptr;
+ union {
+ 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;
+#else
+ memset(&msg, 0, sizeof(msg)); /* make certain msg_accrightslen = 0 */
+#endif /* CMSG_FIRSTHDR */
+
+ msg.msg_name = (char *) sa;
+ msg.msg_namelen = *salenptr;
+ iov[0].iov_base = (char *)ptr;
+ iov[0].iov_len = nbytes;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+
+ if ( (n = recvmsg(fd, &msg, *flagsp)) < 0)
+ return(n);
+
+ *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
+ might be a valid interface value.
+ */
+ memset(pktp, 0, sizeof(struct my_in_pktinfo));
+ pktp->ipi_ifindex = -1;
+ }
+/* end recvfrom_flags1 */
+
+/* include recvfrom_flags2 */
+#ifndef CMSG_FIRSTHDR
+ #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc.
+ *flagsp = 0; /* pass back results */
+ return(n);
+#else
+
+ *flagsp = msg.msg_flags; /* pass back results */
+ if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) ||
+ (msg.msg_flags & MSG_CTRUNC) || pktp == NULL)
+ return(n);
+
+ for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL;
+ cmptr = CMSG_NXTHDR(&msg, cmptr)) {
+
+#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;
+ };
+#endif
+ 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;
+ sin->sin_port = 0;
+ pktp->ipi_ifindex = tmp->ipi_ifindex;
+ continue;
+ }
+#endif
+
+#ifdef IP_RECVDSTADDR
+ 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;
+ continue;
+ }
+#endif
+
+#ifdef IP_RECVIF
+ if (cmptr->cmsg_level == IPPROTO_IP &&
+ cmptr->cmsg_type == IP_RECVIF) {
+ struct sockaddr_dl *sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr);
+#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
+ continue;
+ }
+#endif
+
+#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);
+
+ 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;
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