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/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
Change History (most recent first):
$Log: PlatformCommon.c,v $
Revision 1.7 2006/08/14 23:24:56 cheshire
Re-licensed mDNSResponder daemon source code under Apache License, Version 2.0
Revision 1.6 2005/04/08 21:30:16 ksekar
<rdar://problem/4007457> Compiling problems with mDNSResponder-98 on Solaris/Sparc v9
Patch submitted by Bernd Kuhls
Revision 1.5 2005/02/01 19:33:30 ksekar
<rdar://problem/3985239> Keychain format too restrictive
Revision 1.4 2005/01/19 19:19:21 ksekar
<rdar://problem/3960191> Need a way to turn off domain discovery
Revision 1.3 2004/12/13 17:46:52 cheshire
Use sizeof(buf) instead of fixed constant 1024
Revision 1.2 2004/12/01 03:30:29 cheshire
<rdar://problem/3889346> Add Unicast DNS support to mDNSPosix
Revision 1.1 2004/12/01 01:51:35 cheshire
Move ReadDDNSSettingsFromConfFile() from mDNSMacOSX.c to PlatformCommon.c
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h> // Needed for fopen() etc.
#include <unistd.h> // Needed for close()
#include <string.h> // Needed for strlen() etc.
#include <errno.h> // Needed for errno etc.
#include <sys/socket.h> // Needed for socket() etc.
#include <netinet/in.h> // Needed for sockaddr_in
#include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above
#include "PlatformCommon.h"
#ifdef NOT_HAVE_SOCKLEN_T
typedef unsigned int socklen_t;
#endif
// Bind a UDP socket to a global destination to find the default route's interface address
mDNSexport void FindDefaultRouteIP(mDNSAddr *a)
{
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
int sock = socket(AF_INET,SOCK_DGRAM,0);
a->type = mDNSAddrType_None;
if (sock == -1) return;
addr.sin_family = AF_INET;
addr.sin_port = 1; // Not important, any port and public address will do
addr.sin_addr.s_addr = 0x11111111;
if ((connect(sock,(const struct sockaddr*)&addr,sizeof(addr))) == -1) { close(sock); return; }
if ((getsockname(sock,(struct sockaddr*)&addr, &len)) == -1) { close(sock); return; }
close(sock);
a->type = mDNSAddrType_IPv4;
a->ip.v4.NotAnInteger = addr.sin_addr.s_addr;
}
// dst must be at least MAX_ESCAPED_DOMAIN_NAME bytes, and option must be less than 32 bytes in length
mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f)
{
char buf[32+1+MAX_ESCAPED_DOMAIN_NAME]; // Option name, one space, option value
unsigned int len = strlen(option);
if (len + 1 + MAX_ESCAPED_DOMAIN_NAME > sizeof(buf)-1) { LogMsg("GetConfigOption: option %s too long", option); return mDNSfalse; }
fseek(f, 0, SEEK_SET); // set position to beginning of stream
while (fgets(buf, sizeof(buf), f)) // Read at most sizeof(buf)-1 bytes from file, and append '\0' C-string terminator
{
if (!strncmp(buf, option, len))
{
strncpy(dst, buf + len + 1, MAX_ESCAPED_DOMAIN_NAME-1);
if (dst[MAX_ESCAPED_DOMAIN_NAME-1]) dst[MAX_ESCAPED_DOMAIN_NAME-1] = '\0';
len = strlen(dst);
if (len && dst[len-1] == '\n') dst[len-1] = '\0'; // chop newline
return mDNStrue;
}
}
debugf("Option %s not set", option);
return mDNSfalse;
}
mDNSexport void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled)
{
char buf [MAX_ESCAPED_DOMAIN_NAME];
char secret[MAX_ESCAPED_DOMAIN_NAME] = "";
mStatus err;
FILE *f = fopen(filename, "r");
if (hostname) hostname->c[0] = 0;
if (domain) domain->c[0] = 0;
if (DomainDiscoveryDisabled) *DomainDiscoveryDisabled = mDNSfalse;
if (f)
{
if (DomainDiscoveryDisabled && GetConfigOption(buf, "DomainDiscoveryDisabled", f) && !strcasecmp(buf, "true")) *DomainDiscoveryDisabled = mDNStrue;
if (hostname && GetConfigOption(buf, "hostname", f) && !MakeDomainNameFromDNSNameString(hostname, buf)) goto badf;
if (domain && GetConfigOption(buf, "zone", f) && !MakeDomainNameFromDNSNameString(domain, buf)) goto badf;
GetConfigOption(secret, "secret-64", f); // failure means no authentication
fclose(f);
f = NULL;
}
else
{
if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened.");
return;
}
if (domain && domain->c[0] && secret[0])
{
// for now we assume keyname = service reg domain and we use same key for service and hostname registration
err = mDNS_SetSecretForZone(m, domain, domain, secret);
if (err) LogMsg("ERROR: mDNS_SetSecretForZone returned %d for domain %##s", err, domain->c);
}
return;
badf:
LogMsg("ERROR: malformatted config file");
if (f) fclose(f);
}
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