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562 lines
18 KiB
562 lines
18 KiB
diff --git a/.gitignore b/.gitignore
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new file mode 100644
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index 0000000..920cdfc
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--- /dev/null
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+++ b/.gitignore
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@@ -0,0 +1,4 @@
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+Clients/build
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+mDNSPosix/build
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+mDNSPosix/objects
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+
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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/Responder.c b/mDNSPosix/Responder.c
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index 3996b7b..e58d8eb 100755
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--- a/mDNSPosix/Responder.c
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+++ b/mDNSPosix/Responder.c
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@@ -603,7 +603,8 @@ static mStatus RegisterServicesInFile(const char *filePath)
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status = mStatus_UnknownErr;
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}
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- assert(0 == fclose(fp));
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+ int rv = fclose(fp);
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+ assert(0 == rv);
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return status;
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}
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diff --git a/mDNSPosix/mDNSPosix.c b/mDNSPosix/mDNSPosix.c
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index 953bf64..4e481ea 100755
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--- a/mDNSPosix/mDNSPosix.c
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+++ b/mDNSPosix/mDNSPosix.c
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@@ -136,7 +136,7 @@ mDNSlocal void SockAddrTomDNSAddr(const struct sockaddr *const sa, mDNSAddr *ipA
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// mDNS core calls this routine when it needs to send a packet.
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mDNSexport mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end,
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- mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst,
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+ mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst,
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mDNSIPPort dstPort, mDNSBool useBackgroundTrafficClass)
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{
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int err = 0;
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@@ -574,9 +574,17 @@ mDNSlocal void FreePosixNetworkInterface(PosixNetworkInterface *intf)
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{
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assert(intf != NULL);
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if (intf->intfName != NULL) free((void *)intf->intfName);
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- if (intf->multicastSocket4 != -1) assert(close(intf->multicastSocket4) == 0);
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+ if (intf->multicastSocket4 != -1)
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+ {
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+ int rv = close(intf->multicastSocket4);
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+ assert(rv == 0);
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+ }
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#if HAVE_IPV6
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- if (intf->multicastSocket6 != -1) assert(close(intf->multicastSocket6) == 0);
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+ if (intf->multicastSocket6 != -1)
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+ {
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+ int rv = close(intf->multicastSocket6);
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+ assert(rv == 0);
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+ }
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#endif
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free(intf);
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}
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@@ -703,6 +711,29 @@ 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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@@ -784,6 +815,29 @@ 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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@@ -815,7 +869,12 @@ mDNSlocal int SetupSocket(struct sockaddr *intfAddr, mDNSIPPort port, int interf
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}
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// Clean up
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- if (err != 0 && *sktPtr != -1) { assert(close(*sktPtr) == 0); *sktPtr = -1; }
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+ if (err != 0 && *sktPtr != -1)
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+ {
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+ int rv = close(*sktPtr);
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+ assert(rv == 0);
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+ *sktPtr = -1;
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+ }
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assert((err == 0) == (*sktPtr != -1));
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return err;
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}
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@@ -994,7 +1053,7 @@ 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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@@ -1072,11 +1131,18 @@ 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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@@ -1247,8 +1313,12 @@ 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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@@ -1281,9 +1351,17 @@ mDNSexport void mDNSPlatformClose(mDNS *const m)
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{
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assert(m != NULL);
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ClearInterfaceList(m);
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- if (m->p->unicastSocket4 != -1) assert(close(m->p->unicastSocket4) == 0);
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+ if (m->p->unicastSocket4 != -1)
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+ {
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+ int rv = close(m->p->unicastSocket4);
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+ assert(rv == 0);
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+ }
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#if HAVE_IPV6
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- if (m->p->unicastSocket6 != -1) assert(close(m->p->unicastSocket6) == 0);
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+ if (m->p->unicastSocket6 != -1)
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+ {
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+ int rv = close(m->p->unicastSocket6);
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+ assert(rv == 0);
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+ }
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#endif
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}
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@@ -1533,14 +1611,14 @@ mDNSexport mStatus mDNSPlatformClearSPSMACAddr(void)
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mDNSexport mDNSu16 mDNSPlatformGetUDPPort(UDPSocket *sock)
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{
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(void) sock; // unused
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-
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+
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return (mDNSu16)-1;
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}
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mDNSexport mDNSBool mDNSPlatformInterfaceIsD2D(mDNSInterfaceID InterfaceID)
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{
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(void) InterfaceID; // unused
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-
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+
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return mDNSfalse;
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}
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diff --git a/mDNSPosix/mDNSUNP.c b/mDNSPosix/mDNSUNP.c
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index b392fc7..9f85e0e 100755
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--- a/mDNSPosix/mDNSUNP.c
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+++ b/mDNSPosix/mDNSUNP.c
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@@ -61,154 +61,86 @@
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#endif
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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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-
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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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- int i;
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- int colons=7; /* Number of colons in IPv6 address */
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- int bits_in_block=16; /* Bits per IPv6 block */
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- for(i=0; i<=colons; i++) {
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- int block, ones=0xffff, ones_in_block;
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- if (plen>bits_in_block) ones_in_block=bits_in_block;
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- else ones_in_block=plen;
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- block = ones & (ones << (bits_in_block-ones_in_block));
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- i==0 ? sprintf(addr, "%x", block) : sprintf(addr, "%s:%x", addr, block);
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- plen -= ones_in_block;
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- }
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-}
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+#include <sys/types.h>
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+#include <ifaddrs.h>
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+
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-/* Gets IPv6 interface information from the /proc filesystem in linux*/
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-struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases)
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+/* Correct way to deal with this is just to use getifaddrs (glibc
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+ * 2.3.3+ and various BSDs, but BSDs are 'slightly different' just to
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+ * make life interesting). We assume Linux getifaddrs is available,
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+ * and if not, please upgrade. */
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+struct ifi_info *get_ifi_info_linuxv6(int doaliases)
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{
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- struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr;
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- FILE *fp;
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- char addr[8][5];
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- int flags, myflags, index, plen, scope;
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- char ifname[9], lastname[IFNAMSIZ];
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- char addr6[32+7+1]; /* don't forget the seven ':' */
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- struct addrinfo hints, *res0;
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- struct sockaddr_in6 *sin6;
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- struct in6_addr *addrptr;
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- int err;
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- int sockfd = -1;
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- struct ifreq ifr;
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-
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- res0=NULL;
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- ifihead = NULL;
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- ifipnext = &ifihead;
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- lastname[0] = 0;
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+ struct ifaddrs *ifap, *ifa;
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+ struct ifi_info *ifi = NULL, *head = NULL;
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- if ((fp = fopen(PROC_IFINET6_PATH, "r")) != NULL) {
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- sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
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- if (sockfd < 0) {
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- goto gotError;
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+ /* doaliases seems always true in the calls in current code */
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+ assert(doaliases);
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+
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+ if (getifaddrs(&ifap) < 0)
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+ {
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+ return NULL;
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+ }
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+ for (ifa = ifap ; ifa ; ifa = ifa->ifa_next)
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+ {
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+ /* Care only about IPv6 addresses on non-point-to-point links. */
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+ if (!ifa->ifa_addr
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+ || ifa->ifa_addr->sa_family != AF_INET6)
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+ continue;
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+ ifi = calloc(1, sizeof(*ifi));
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+ if (!ifi)
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+ break;
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+ strncpy(ifi->ifi_name, ifa->ifa_name, IFI_NAME);
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+ /* We ignore ifi_{haddr,hlen}, everyone else does too */
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+ ifi->ifi_flags = ifa->ifa_flags;
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+ /* We ignore ifi_myflags; IFI_ALIAS isn't used anywhere */
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+ ifi->ifi_index = if_nametoindex(ifa->ifa_name);
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+ if (!(ifi->ifi_addr = malloc(sizeof(struct sockaddr_in6))))
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+ break;
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+ memcpy(ifi->ifi_addr, ifa->ifa_addr, sizeof(struct sockaddr_in6));
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+
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+ if (ifa->ifa_netmask)
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+ {
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+ if (!(ifi->ifi_netmask = malloc(sizeof(struct sockaddr_in6))))
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+ break;
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+ memcpy(ifi->ifi_netmask, ifa->ifa_netmask,
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+ sizeof(struct sockaddr_in6));
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}
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- while (fscanf(fp,
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- "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %8s\n",
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- addr[0],addr[1],addr[2],addr[3],
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- addr[4],addr[5],addr[6],addr[7],
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- &index, &plen, &scope, &flags, ifname) != EOF) {
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-
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- myflags = 0;
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- if (strncmp(lastname, ifname, IFNAMSIZ) == 0) {
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- if (doaliases == 0)
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- continue; /* already processed this interface */
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- myflags = IFI_ALIAS;
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- }
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- memcpy(lastname, ifname, IFNAMSIZ);
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- ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info));
|
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- if (ifi == NULL) {
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- goto gotError;
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- }
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|
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- ifipold = *ifipnext; /* need this later */
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- ifiptr = ifipnext;
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- *ifipnext = ifi; /* prev points to this new one */
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- ifipnext = &ifi->ifi_next; /* pointer to next one goes here */
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-
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- sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
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- addr[0],addr[1],addr[2],addr[3],
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- addr[4],addr[5],addr[6],addr[7]);
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-
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- /* Add address of the interface */
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- memset(&hints, 0, sizeof(hints));
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- hints.ai_family = AF_INET6;
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- hints.ai_flags = AI_NUMERICHOST;
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- err = getaddrinfo(addr6, NULL, &hints, &res0);
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- if (err) {
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- goto gotError;
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- }
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- ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6));
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- if (ifi->ifi_addr == NULL) {
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- goto gotError;
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- }
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- memcpy(ifi->ifi_addr, res0->ai_addr, sizeof(struct sockaddr_in6));
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+ if (!(ifi->ifi_addr = malloc(sizeof(struct sockaddr_in6))))
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+ break;
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+ memcpy(ifi->ifi_addr, ifa->ifa_addr, sizeof(struct sockaddr_in6));
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- /* Add netmask of the interface */
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- char ipv6addr[INET6_ADDRSTRLEN];
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- plen_to_mask(plen, ipv6addr);
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- ifi->ifi_netmask = calloc(1, sizeof(struct sockaddr_in6));
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- if (ifi->ifi_addr == NULL) {
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- goto gotError;
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- }
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- sin6=calloc(1, sizeof(struct sockaddr_in6));
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- addrptr=calloc(1, sizeof(struct in6_addr));
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- inet_pton(family, ipv6addr, addrptr);
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- sin6->sin6_family=family;
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- sin6->sin6_addr=*addrptr;
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- sin6->sin6_scope_id=scope;
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- memcpy(ifi->ifi_netmask, sin6, sizeof(struct sockaddr_in6));
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- free(sin6);
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-
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-
|
|
- /* Add interface name */
|
|
- memcpy(ifi->ifi_name, ifname, IFI_NAME);
|
|
-
|
|
- /* Add interface index */
|
|
- ifi->ifi_index = index;
|
|
-
|
|
- /* Add interface flags*/
|
|
- memcpy(ifr.ifr_name, ifname, IFNAMSIZ);
|
|
- if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
|
|
- if (errno == EADDRNOTAVAIL) {
|
|
- /*
|
|
- * If the main interface is configured with no IP address but
|
|
- * an alias interface exists with an IP address, you get
|
|
- * EADDRNOTAVAIL for the main interface
|
|
- */
|
|
- free(ifi->ifi_addr);
|
|
- free(ifi);
|
|
- ifipnext = ifiptr;
|
|
- *ifipnext = ifipold;
|
|
- continue;
|
|
- } else {
|
|
- goto gotError;
|
|
- }
|
|
- }
|
|
- ifi->ifi_flags = ifr.ifr_flags;
|
|
- freeaddrinfo(res0);
|
|
- res0=NULL;
|
|
- }
|
|
- }
|
|
- goto done;
|
|
|
|
-gotError:
|
|
- if (ifihead != NULL) {
|
|
- free_ifi_info(ifihead);
|
|
- ifihead = NULL;
|
|
- }
|
|
- if (res0 != NULL) {
|
|
- freeaddrinfo(res0);
|
|
- res0=NULL;
|
|
- }
|
|
-done:
|
|
- if (sockfd != -1) {
|
|
- assert(close(sockfd) == 0);
|
|
+ if (ifa->ifa_flags & IFF_POINTOPOINT && ifa->ifa_dstaddr)
|
|
+ {
|
|
+ if (!(ifi->ifi_dstaddr = malloc(sizeof(struct sockaddr_in6))))
|
|
+ break;
|
|
+ memcpy(ifi->ifi_dstaddr, ifa->ifa_dstaddr,
|
|
+ sizeof(struct sockaddr_in6));
|
|
+ }
|
|
+ else if (ifa->ifa_broadaddr)
|
|
+ {
|
|
+ if (!(ifi->ifi_brdaddr = malloc(sizeof(struct sockaddr_in6))))
|
|
+ break;
|
|
+ memcpy(ifi->ifi_brdaddr, ifa->ifa_broadaddr,
|
|
+ sizeof(struct sockaddr_in6));
|
|
+ }
|
|
+ ifi->ifi_next = head;
|
|
+ head = ifi;
|
|
+ ifi = NULL;
|
|
+ };
|
|
+ if (ifi)
|
|
+ {
|
|
+ /* An error occurred. Let's bail out. */
|
|
+ ifi->ifi_next = head;
|
|
+ free_ifi_info(head);
|
|
+ return NULL;
|
|
}
|
|
- return(ifihead); /* pointer to first structure in linked list */
|
|
+ freeifaddrs(ifap);
|
|
+ return head;
|
|
}
|
|
+
|
|
#endif // defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
|
|
|
|
struct ifi_info *get_ifi_info(int family, int doaliases)
|
|
@@ -229,7 +161,7 @@ struct ifi_info *get_ifi_info(int family, int doaliases)
|
|
#endif
|
|
|
|
#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
|
|
- if (family == AF_INET6) return get_ifi_info_linuxv6(family, doaliases);
|
|
+ if (family == AF_INET6) return get_ifi_info_linuxv6(doaliases);
|
|
#endif
|
|
|
|
sockfd = -1;
|
|
diff --git a/mDNSPosix/mDNSUNP.h b/mDNSPosix/mDNSUNP.h
|
|
index cc81b7d..e710087 100755
|
|
--- a/mDNSPosix/mDNSUNP.h
|
|
+++ b/mDNSPosix/mDNSUNP.h
|
|
@@ -97,8 +97,7 @@ struct ifi_info {
|
|
};
|
|
|
|
#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
|
|
-#define PROC_IFINET6_PATH "/proc/net/if_inet6"
|
|
-extern struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases);
|
|
+extern struct ifi_info *get_ifi_info_linuxv6(int doaliases);
|
|
#endif
|
|
|
|
#if defined(AF_INET6) && HAVE_IPV6
|
|
diff --git a/mDNSShared/dnsextd_parser.y b/mDNSShared/dnsextd_parser.y
|
|
index 18c5990..d4b63ce 100644
|
|
--- a/mDNSShared/dnsextd_parser.y
|
|
+++ b/mDNSShared/dnsextd_parser.y
|
|
@@ -15,6 +15,8 @@
|
|
* limitations under the License.
|
|
*/
|
|
|
|
+%parse-param { void *context }
|
|
+
|
|
%{
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
@@ -23,7 +25,7 @@
|
|
#include "DebugServices.h"
|
|
#include "dnsextd.h"
|
|
|
|
-void yyerror( const char* error );
|
|
+void yyerror( void *context, const char* error );
|
|
int yylex(void);
|
|
|
|
|
|
@@ -378,7 +380,7 @@ int yywrap(void);
|
|
|
|
extern int yylineno;
|
|
|
|
-void yyerror( const char *str )
|
|
+void yyerror( void *context, const char *str )
|
|
{
|
|
fprintf( stderr,"%s:%d: error: %s\n", g_filename, yylineno, str );
|
|
}
|