Hello,
Currently whole unicast DNS-SD is unavailable on Linux because mdnsd never
reads and registers list of uDNS servers.Attached patch makes Posix daemon
parse /etc/dns-sd.resolv.conf (name probably should be configurable via
cmdline option). It follows resolv.conf syntax so in most cases you can just
symlink /etc/resolv.conf to /etc/dns-sd.resolv.conf and enjoy DNS-SD over
unicast DNS.
diff -urd mDNSResponder/mDNSPosix/PosixDaemon.c mDNSResponder-mod/mDNSPosix/PosixDaemon.c
--- mDNSResponder/mDNSPosix/PosixDaemon.c 2004-09-21 23:05:12.000000000 +0200
+++ mDNSResponder-mod/mDNSPosix/PosixDaemon.c 2004-11-11 11:53:06.000000000 +0100
@@ -89,6 +89,7 @@
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
+#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
@@ -102,6 +103,7 @@
static void ParseCmdLinArgs( int argc, char **argv);
static void DumpStateLog( mDNS *m);
+static int ParseDNSServers( mDNS *m,const char *filePath);
static mStatus MainLoop( mDNS *m);
@@ -126,6 +128,9 @@
if ( mStatus_NoError == err)
err = udsserver_init();
+
+ if (ParseDNSServers( &mDNSRecord, "/etc/dns-sd.resolv.conf") < 0)
+ LogMsg("Unable to parse DNS server list. Unicast DNS-SD unavailable");
// Now that we're finished with anything privileged, switch over to running as "nobody"
if ( mStatus_NoError == err)
@@ -235,6 +240,31 @@
}
}
+static int ParseDNSServers( mDNS *m, const char *filePath)
+{
+ char line[256];
+ char nameserver[16];
+ char keyword[10];
+ int numOfServers = 0;
+ FILE * fp = fopen(filePath, "r");
+
+ if (fp == NULL) {
+ return -1;
+ }
+ while (fgets(line,sizeof(line),fp)) {
+ mDNSv4Addr DNSAddr;
+ line[255]='\0'; // just to be safe
+ if (sscanf(line,"%10s %15s",keyword,nameserver) != 2) { // it will skip whitespaces
+ continue;
+ }
+ if (strncmp(keyword,"nameserver",10)) continue;
+ if (inet_aton(nameserver,&DNSAddr) != 0) {
+ mDNS_RegisterDNS(m,&DNSAddr);
+ numOfServers++;
+ }
+ }
+ return (numOfServers > 0) ? 0 : -1;
+}
static void DumpStateLog(mDNS *const m)
// Dump a little log of what we've been up to.
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