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