|
|
- --- /dev/null
- +++ b/.gitignore
- @@ -0,0 +1,4 @@
- +Clients/build
- +mDNSPosix/build
- +mDNSPosix/objects
- +
- --- 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)
- --- 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);
-
- --- a/mDNSPosix/Responder.c
- +++ b/mDNSPosix/Responder.c
- @@ -603,7 +603,8 @@ static mStatus RegisterServicesInFile(co
- status = mStatus_UnknownErr;
- }
-
- - assert(0 == fclose(fp));
- + int rv = fclose(fp);
- + assert(0 == rv);
-
- return status;
- }
- --- a/mDNSPosix/mDNSPosix.c
- +++ b/mDNSPosix/mDNSPosix.c
- @@ -138,7 +138,7 @@ mDNSlocal void SockAddrTomDNSAddr(const
-
- // mDNS core calls this routine when it needs to send a packet.
- mDNSexport mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end,
- - mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst,
- + mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst,
- mDNSIPPort dstPort, mDNSBool useBackgroundTrafficClass)
- {
- int err = 0;
- @@ -583,9 +583,17 @@ mDNSlocal void FreePosixNetworkInterface
- {
- assert(intf != NULL);
- if (intf->intfName != NULL) free((void *)intf->intfName);
- - if (intf->multicastSocket4 != -1) assert(close(intf->multicastSocket4) == 0);
- + if (intf->multicastSocket4 != -1)
- + {
- + int rv = close(intf->multicastSocket4);
- + assert(rv == 0);
- + }
- #if HAVE_IPV6
- - if (intf->multicastSocket6 != -1) assert(close(intf->multicastSocket6) == 0);
- + if (intf->multicastSocket6 != -1)
- + {
- + int rv = close(intf->multicastSocket6);
- + assert(rv == 0);
- + }
- #endif
-
- // Move interface to the RecentInterfaces list for a minute
- @@ -724,6 +732,29 @@ mDNSlocal int SetupSocket(struct sockadd
- 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)
- {
- @@ -805,6 +836,29 @@ mDNSlocal int SetupSocket(struct sockadd
- 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)
- {
- @@ -836,7 +890,12 @@ mDNSlocal int SetupSocket(struct sockadd
- }
-
- // Clean up
- - if (err != 0 && *sktPtr != -1) { assert(close(*sktPtr) == 0); *sktPtr = -1; }
- + if (err != 0 && *sktPtr != -1)
- + {
- + int rv = close(*sktPtr);
- + assert(rv == 0);
- + *sktPtr = -1;
- + }
- assert((err == 0) == (*sktPtr != -1));
- return err;
- }
- @@ -942,19 +1001,14 @@ mDNSlocal int SetupInterfaceList(mDNS *c
- 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)
- @@ -1030,7 +1084,7 @@ mDNSlocal mStatus OpenIfNotifySocket(int
- /* 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;
- @@ -1108,11 +1162,18 @@ mDNSlocal mDNSu32 ProcessRoutingNo
- 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)
- @@ -1283,8 +1344,12 @@ mDNSexport mStatus mDNSPlatformInit(mDNS
- 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);
- @@ -1317,9 +1382,17 @@ mDNSexport void mDNSPlatformClose(mDNS *
- {
- assert(m != NULL);
- ClearInterfaceList(m);
- - if (m->p->unicastSocket4 != -1) assert(close(m->p->unicastSocket4) == 0);
- + if (m->p->unicastSocket4 != -1)
- + {
- + int rv = close(m->p->unicastSocket4);
- + assert(rv == 0);
- + }
- #if HAVE_IPV6
- - if (m->p->unicastSocket6 != -1) assert(close(m->p->unicastSocket6) == 0);
- + if (m->p->unicastSocket6 != -1)
- + {
- + int rv = close(m->p->unicastSocket6);
- + assert(rv == 0);
- + }
- #endif
- }
-
- @@ -1575,14 +1648,14 @@ mDNSexport mStatus mDNSPlatformClearS
- mDNSexport mDNSu16 mDNSPlatformGetUDPPort(UDPSocket *sock)
- {
- (void) sock; // unused
- -
- +
- return (mDNSu16)-1;
- }
-
- mDNSexport mDNSBool mDNSPlatformInterfaceIsD2D(mDNSInterfaceID InterfaceID)
- {
- (void) InterfaceID; // unused
- -
- +
- return mDNSfalse;
- }
-
- --- 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) {
- @@ -86,7 +87,7 @@ struct ifi_info *get_ifi_info_linuxv6(in
- FILE *fp;
- char addr[8][5];
- int flags, myflags, index, plen, scope;
- - char ifname[9], lastname[IFNAMSIZ];
- + char ifname[IFNAMSIZ], lastname[IFNAMSIZ];
- char addr6[32+7+1]; /* don't forget the seven ':' */
- struct addrinfo hints, *res0;
- struct sockaddr_in6 *sin6;
- @@ -94,7 +95,8 @@ struct ifi_info *get_ifi_info_linuxv6(in
- int err;
- int sockfd = -1;
- struct ifreq ifr;
- -
- + char mask[64] = "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %";
- + sprintf(mask+strlen(mask), "%ds\n", IFNAMSIZ);
- res0=NULL;
- ifihead = NULL;
- ifipnext = &ifihead;
- @@ -106,11 +108,12 @@ struct ifi_info *get_ifi_info_linuxv6(in
- goto gotError;
- }
- while (fscanf(fp,
- - "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %8s\n",
- + mask,
- addr[0],addr[1],addr[2],addr[3],
- addr[4],addr[5],addr[6],addr[7],
- &index, &plen, &scope, &flags, ifname) != EOF) {
-
- + if (flags & IFA_F_DEPRECATED) continue;
- myflags = 0;
- if (strncmp(lastname, ifname, IFNAMSIZ) == 0) {
- if (doaliases == 0)
- @@ -204,8 +207,11 @@ gotError:
- res0=NULL;
- }
- done:
- + if (fp)
- + fclose(fp);
- if (sockfd != -1) {
- - assert(close(sockfd) == 0);
- + int rv = close(sockfd);
- + assert(rv == 0);
- }
- return(ifihead); /* pointer to first structure in linked list */
- }
- --- 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 );
- }
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