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262 lines
8.5 KiB
262 lines
8.5 KiB
diff --git a/Clients/Makefile b/Clients/Makefile
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index 383af31..925c20e 100755
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--- a/Clients/Makefile
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+++ b/Clients/Makefile
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@@ -36,7 +36,7 @@ TARGETS = build/dns-sd build/dns-sd64
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LIBS =
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else
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TARGETS = build/dns-sd
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-LIBS = -L../mDNSPosix/build/prod/ -ldns_sd
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+LIBS ?= -L../mDNSPosix/build/prod/ -ldns_sd
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endif
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all: $(TARGETS)
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diff --git a/mDNSPosix/PosixDaemon.c b/mDNSPosix/PosixDaemon.c
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index 88b3292..e86a6c7 100644
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--- a/mDNSPosix/PosixDaemon.c
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+++ b/mDNSPosix/PosixDaemon.c
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@@ -37,6 +37,11 @@
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#include <fcntl.h>
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#include <pwd.h>
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#include <sys/types.h>
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+#ifdef __linux__
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+#include <sys/capability.h> /* !!! We require libcap-dev for this. Oh well. */
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+/* prctl is required to enable inheriting of capabilities across setuid */
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+#include <sys/prctl.h>
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+#endif /* __linux__ */
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#if __APPLE__
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#undef daemon
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@@ -184,16 +189,50 @@ int main(int argc, char **argv)
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Reconfigure(&mDNSStorage);
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+#ifdef __linux__
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+ /*
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+ * SO_BINDTODEVICE is privileged operation; however, we can get
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+ * around it using capabilities instead of remaining root.
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+ */
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+ if (mStatus_NoError == err)
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+ {
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+ if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) < 0)
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+ perror("prctl PR_SET_KEEPCAPS");
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+ }
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+#endif /* __linux__ */
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+
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// Now that we're finished with anything privileged, switch over to running as "nobody"
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if (mStatus_NoError == err)
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{
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const struct passwd *pw = getpwnam("nobody");
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if (pw != NULL)
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+ {
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setuid(pw->pw_uid);
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+#ifdef __linux__
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+ struct __user_cap_header_struct ch;
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+ struct __user_cap_data_struct cd[_LINUX_CAPABILITY_U32S_3];
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+
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+ memset(&ch, 0, sizeof(ch));
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+ ch.version = _LINUX_CAPABILITY_VERSION_3;
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+ ch.pid = getpid();
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+ memset(&cd[0], 0, sizeof(cd));
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+ /* CAP_NET_RAW is required to use SO_BINDTODEVICE */
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+ int caps = CAP_TO_MASK(CAP_NET_RAW);
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+ cd[0].permitted = caps;
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+ cd[0].effective = caps;
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+ if (capset(&ch, &cd[0]) < 0)
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+ perror("capset");
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+#endif /* __linux__ */
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+ }
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else
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LogMsg("WARNING: mdnsd continuing as root because user \"nobody\" does not exist");
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}
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+#ifdef __linux__
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+ if (mStatus_NoError == err)
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+ err = mDNSPlatformPosixRefreshInterfaceList(&mDNSStorage);
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+#endif /* __linux__ */
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+
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if (mStatus_NoError == err)
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err = MainLoop(&mDNSStorage);
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diff --git a/mDNSPosix/mDNSPosix.c b/mDNSPosix/mDNSPosix.c
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index 6effa12..7c1d6eb 100755
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--- a/mDNSPosix/mDNSPosix.c
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+++ b/mDNSPosix/mDNSPosix.c
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@@ -733,6 +741,29 @@ mDNSlocal int SetupSocket(struct sockaddr *intfAddr, mDNSIPPort port, int interf
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if (err < 0) { err = errno; perror("setsockopt - IP_MULTICAST_TTL"); }
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}
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+#ifdef __linux__
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+#ifdef SO_BINDTODEVICE
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+ if (err == 0 && interfaceIndex)
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+ {
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+ char ifname[IFNAMSIZ];
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+ if (if_indextoname(interfaceIndex, ifname))
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+ {
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+ err = setsockopt(*sktPtr, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
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+ if (err < 0)
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+ {
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+ err = errno;
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+ perror("setsockopt - SO_BINDTODEVICE");
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+ }
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+ }
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+ else
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+ {
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+ err = errno;
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+ perror("if_indextoname");
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+ }
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+ }
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+#endif /* SO_BINDTODEVICE */
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+#endif /* __linux__ */
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+
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// And start listening for packets
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if (err == 0)
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{
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@@ -814,6 +845,29 @@ mDNSlocal int SetupSocket(struct sockaddr *intfAddr, mDNSIPPort port, int interf
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if (err < 0) { err = errno; perror("setsockopt - IPV6_MULTICAST_HOPS"); }
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}
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+#ifdef __linux__
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+#ifdef SO_BINDTODEVICE
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+ if (err == 0 && interfaceIndex)
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+ {
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+ char ifname[IFNAMSIZ];
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+ if (if_indextoname(interfaceIndex, ifname))
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+ {
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+ err = setsockopt(*sktPtr, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
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+ if (err < 0)
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+ {
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+ err = errno;
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+ perror("setsockopt - SO_BINDTODEVICE");
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+ }
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+ }
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+ else
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+ {
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+ err = errno;
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+ perror("if_indextoname");
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+ }
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+ }
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+#endif /* SO_BINDTODEVICE */
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+#endif /* __linux__ */
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+
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// And start listening for packets
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if (err == 0)
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{
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@@ -958,19 +1017,14 @@ mDNSlocal int SetupInterfaceList(mDNS *const m)
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int err = 0;
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struct ifi_info *intfList = get_ifi_info(AF_INET, mDNStrue);
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struct ifi_info *firstLoopback = NULL;
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+ struct ifi_info **p = &intfList;
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assert(m != NULL);
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debugf("SetupInterfaceList");
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- if (intfList == NULL) err = ENOENT;
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-
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#if HAVE_IPV6
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- if (err == 0) /* Link the IPv6 list to the end of the IPv4 list */
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- {
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- struct ifi_info **p = &intfList;
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- while (*p) p = &(*p)->ifi_next;
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- *p = get_ifi_info(AF_INET6, mDNStrue);
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- }
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+ while (*p) p = &(*p)->ifi_next;
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+ *p = get_ifi_info(AF_INET6, mDNStrue);
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#endif
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if (err == 0)
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@@ -1046,7 +1100,7 @@ mDNSlocal mStatus OpenIfNotifySocket(int *pFD)
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/* Subscribe the socket to Link & IP addr notifications. */
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mDNSPlatformMemZero(&snl, sizeof snl);
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snl.nl_family = AF_NETLINK;
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- snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
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+ snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;
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ret = bind(sock, (struct sockaddr *) &snl, sizeof snl);
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if (0 == ret)
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*pFD = sock;
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@@ -1124,11 +1178,18 @@ mDNSlocal mDNSu32 ProcessRoutingNotification(int sd)
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PrintNetLinkMsg(pNLMsg);
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#endif
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+ // this result isn't used anywhere as a number, just as
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+ // non-zero - however, I have seen devices with more than 32
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+ // interfaces at some point..
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+ // (on Linux, every tunnel increases index for example)
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+
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// Process the NetLink message
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if (pNLMsg->nlmsg_type == RTM_GETLINK || pNLMsg->nlmsg_type == RTM_NEWLINK)
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- result |= 1 << ((struct ifinfomsg*) NLMSG_DATA(pNLMsg))->ifi_index;
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+ result |= 1;
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+ // << ((struct ifinfomsg*) NLMSG_DATA(pNLMsg))->ifi_index;
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else if (pNLMsg->nlmsg_type == RTM_DELADDR || pNLMsg->nlmsg_type == RTM_NEWADDR)
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- result |= 1 << ((struct ifaddrmsg*) NLMSG_DATA(pNLMsg))->ifa_index;
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+ result |= 1;
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+ // << ((struct ifaddrmsg*) NLMSG_DATA(pNLMsg))->ifa_index;
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// Advance pNLMsg to the next message in the buffer
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if ((pNLMsg->nlmsg_flags & NLM_F_MULTI) != 0 && pNLMsg->nlmsg_type != NLMSG_DONE)
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@@ -1299,8 +1360,12 @@ mDNSexport mStatus mDNSPlatformInit(mDNS *const m)
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if (err == mStatus_NoError) err = SetupSocket(&sa, zeroIPPort, 0, &m->p->unicastSocket6);
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#endif
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+ // In Linux case, we can't set up sockets with different owner -
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+ // it blows up SO_REUSEPORT. So we do this step bit later.
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+#ifndef __linux__
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// Tell mDNS core about the network interfaces on this machine.
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if (err == mStatus_NoError) err = SetupInterfaceList(m);
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+#endif /* !__linux__ */
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// Tell mDNS core about DNS Servers
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mDNS_Lock(m);
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diff --git a/mDNSPosix/mDNSUNP.c b/mDNSPosix/mDNSUNP.c
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index b392fc7..f551ad5 100755
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--- a/mDNSPosix/mDNSUNP.c
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+++ b/mDNSPosix/mDNSUNP.c
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@@ -63,6 +63,7 @@
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#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
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#include <netdb.h>
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#include <arpa/inet.h>
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+#include <linux/if_addr.h>
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/* Converts a prefix length to IPv6 network mask */
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void plen_to_mask(int plen, char *addr) {
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@@ -127,6 +128,8 @@
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nitems = fscanf(fp, ifnameFmt, ifname);
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if (nitems != 1) break;
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+ if (flags & IFA_F_DEPRECATED) continue;
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+
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if (strcmp(lastname, ifname) == 0) {
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if (doaliases == 0)
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continue; /* already processed this interface */
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diff --git a/mDNSShared/dnsextd_parser.y b/mDNSShared/dnsextd_parser.y
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index 18c5990..d4b63ce 100644
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--- a/mDNSShared/dnsextd_parser.y
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+++ b/mDNSShared/dnsextd_parser.y
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@@ -15,6 +15,8 @@
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* limitations under the License.
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*/
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+%parse-param { void *context }
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+
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%{
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#include <stdio.h>
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#include <stdlib.h>
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@@ -23,7 +25,7 @@
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#include "DebugServices.h"
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#include "dnsextd.h"
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-void yyerror( const char* error );
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+void yyerror( void *context, const char* error );
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int yylex(void);
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@@ -409,7 +419,7 @@ int yywrap(void);
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extern int yylineno;
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-void yyerror( const char *str )
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+void yyerror( void *context, const char *str )
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{
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fprintf( stderr,"%s:%d: error: %s\n", g_filename, yylineno, str );
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}
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