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modeNetboot.c
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modeNetboot.c
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/*
* Copyright (c) 2005-2007 Apple Inc. All Rights Reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/*
* modeNetboot.c
* bless
*
* Created by Shantonu Sen on 10/10/05.
* Copyright 2005-2007 Apple Inc. All Rights Reserved.
*
*/
/*
* Modifications by joevt on Jan 15 2021.
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <net/if.h>
#include <arpa/nameser.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "enums.h"
#include "structs.h"
#include "bless.h"
#include "bless_private.h"
#include "protos.h"
static bool validateAddress(const char *host);
static int parseURL(BLContextPtr context,
const char *url,
char * scheme,
char * interface,
char * host,
char * path,
bool requiresPath,
const char *requiresScheme,
bool useBackslash);
int modeNetboot(BLContextPtr context, struct clarg actargs[klast])
{
int ret;
BLPreBootEnvType preboot;
char interface[IF_NAMESIZE];
char host[NS_MAXDNAME];
char path[MAXPATHLEN];
char scheme[128];
bool useBackslash = false;
if(!( actargs[kserver].present || actargs[kbooter].present)) {
blesscontextprintf(context, kBLLogLevelError,
"No NetBoot server specification provided\n");
return 1;
}
ret = BLGetPreBootEnvironmentType(context, &preboot);
if(ret)
return 2;
if(preboot == kBLPreBootEnvType_OpenFirmware) {
useBackslash = true;
}
if (actargs[kserver].present) {
blesscontextprintf(context, kBLLogLevelVerbose,
"NetBoot server specification given as: %s\n",
actargs[kserver].argument);
ret = parseURL(context,
actargs[kserver].argument,
scheme,
interface,
host,
path,
false,
NULL,
useBackslash);
} else {
blesscontextprintf(context, kBLLogLevelVerbose,
"NetBoot booter given as: %s\n",
actargs[kbooter].argument);
ret = parseURL(context,
actargs[kbooter].argument,
scheme,
interface,
host,
path,
true,
"tftp",
useBackslash);
}
if(ret)
return 1;
if(preboot == kBLPreBootEnvType_OpenFirmware) {
// XXX temporary stub
#define NVRAM "/usr/sbin/nvram"
char * OFSettings[6];
char bootdevice[1024];
char bootfile[1024];
char bootcommand[1024];
char bootargs[1024];
char ofstring[1024];
pid_t p;
int status;
if (0 != strcmp(scheme, "bsdp") && 0 != strcmp(scheme, "tftp")) {
blesscontextprintf(context, kBLLogLevelError,
"Netboot scheme %s not supported on Open Firmware systems\n",
scheme);
}
ret = BLGetOpenFirmwareBootDeviceForNetworkPath(context,
interface,
strcmp(host, "255.255.255.255") == 0 ? NULL : host,
path,
ofstring);
if(ret)
return 3;
sprintf(bootdevice, "boot-device=%s", ofstring);
if(actargs[kkernel].present) {
ret = parseURL(context,
actargs[kkernel].argument,
scheme,
interface,
host,
path,
true,
"tftp",
useBackslash);
if(ret)
return 1;
ret = BLGetOpenFirmwareBootDeviceForNetworkPath(context,
interface,
strcmp(host, "255.255.255.255") == 0 ? NULL : host,
path,
ofstring);
if(ret)
return 4;
sprintf(bootfile, "boot-file=%s", ofstring);
} else {
sprintf(bootfile, "boot-file=");
}
if(actargs[kmkext].present) {
blesscontextprintf(context, kBLLogLevelError,
"mkext option not supported on Open Firmware systems\n");
return 5;
}
sprintf(bootcommand, "boot-command=mac-boot");
sprintf(bootargs, "boot-args=");
OFSettings[0] = NVRAM;
OFSettings[1] = bootdevice;
OFSettings[2] = bootfile;
OFSettings[3] = bootcommand;
OFSettings[4] = bootargs;
OFSettings[5] = NULL;
blesscontextprintf(context, kBLLogLevelVerbose, "OF Setings:\n" );
blesscontextprintf(context, kBLLogLevelVerbose, "\t\tprogram: %s\n", OFSettings[0] );
blesscontextprintf(context, kBLLogLevelVerbose, "\t\t%s\n", OFSettings[1] );
blesscontextprintf(context, kBLLogLevelVerbose, "\t\t%s\n", OFSettings[2] );
blesscontextprintf(context, kBLLogLevelVerbose, "\t\t%s\n", OFSettings[3] );
blesscontextprintf(context, kBLLogLevelVerbose, "\t\t%s\n", OFSettings[4] );
p = fork();
if (p == 0) {
int ret = execv(NVRAM, OFSettings);
if(ret == -1) {
blesscontextprintf(context, kBLLogLevelError, "Could not exec %s\n", NVRAM );
}
_exit(1);
}
do {
p = wait(&status);
} while (p == -1 && errno == EINTR);
if(p == -1 || status) {
blesscontextprintf(context, kBLLogLevelError, "%s returned non-0 exit status\n", NVRAM );
return 3;
}
} else if(preboot == kBLPreBootEnvType_EFI) {
CFStringRef booterXML = NULL, kernelXML = NULL, mkextXML = NULL, kernelcacheXML = NULL;
BLNetBootProtocolType protocol = kBLNetBootProtocol_Unknown;
if (0 == strcmp(scheme, "bsdp") || 0 == strcmp(scheme, "tftp")) {
protocol = kBLNetBootProtocol_BSDP;
} else if (0 == strcmp(scheme, "pxe")) {
protocol = kBLNetBootProtocol_PXE;
if (0 != strcmp(host, "255.255.255.255")) {
blesscontextprintf(context, kBLLogLevelError,
"PXE requires broadcast address 255.255.255.255\n");
return 3;
}
} else {
blesscontextprintf(context, kBLLogLevelError,
"Netboot scheme %s not supported on EFI systems\n",
scheme);
return 3;
}
ret = BLCreateEFIXMLRepresentationForNetworkPath(context,
protocol,
interface,
strcmp(host, "255.255.255.255") == 0 ? NULL : host,
strlen(path) > 0 ? path : NULL,
actargs[koptions].present ? actargs[koptions].argument : NULL,
&booterXML);
if(ret)
return 3;
if(actargs[kkernel].present) {
ret = parseURL(context,
actargs[kkernel].argument,
scheme,
interface,
host,
path,
true,
"tftp",
false);
if(ret)
return 1;
ret = BLCreateEFIXMLRepresentationForNetworkPath(context,
protocol,
interface,
host,
path,
NULL,
&kernelXML);
if(ret)
return 3;
}
if(actargs[kmkext].present) {
ret = parseURL(context,
actargs[kmkext].argument,
scheme,
interface,
host,
path,
true,
"tftp",
false);
if(ret)
return 1;
ret = BLCreateEFIXMLRepresentationForNetworkPath(context,
protocol,
interface,
host,
path,
NULL,
&mkextXML);
if(ret)
return 3;
}
if(actargs[kkernelcache].present) {
ret = parseURL(context,
actargs[kkernelcache].argument,
scheme,
interface,
host,
path,
true,
"tftp",
false);
if(ret)
return 1;
ret = BLCreateEFIXMLRepresentationForNetworkPath(context,
protocol,
interface,
host,
path,
NULL,
&kernelcacheXML);
if(ret)
return 3;
}
ret = setefinetworkpath(context, booterXML, kernelXML, mkextXML, kernelcacheXML,
actargs[knextonly].present);
if(ret) {
blesscontextprintf(context, kBLLogLevelError, "Can't set EFI\n" );
return 1;
} else {
blesscontextprintf(context, kBLLogLevelVerbose, "EFI set successfully\n" );
}
} else {
blesscontextprintf(context, kBLLogLevelError,
"NetBoot not supported on this system\n");
return 3;
}
return 0;
}
static bool validateAddress(const char *host)
{
in_addr_t addr;
int ret;
ret = inet_pton(PF_INET, host, &addr);
if(ret == 1)
return true;
else
return false;
}
static int parseURL(BLContextPtr context,
const char *url,
char * scheme,
char * interface,
char * host,
char * path,
bool requiresPath,
const char *requiresScheme,
bool useBackslash)
{
int ret;
CFURLRef serverURL;
CFStringRef schemeString, interfaceString, pathString, hostString;
CFStringRef requiredScheme = NULL;
serverURL = CFURLCreateAbsoluteURLWithBytes(kCFAllocatorDefault,
(const UInt8 *)url,
strlen(url),
kCFStringEncodingUTF8,
NULL, false);
if(!serverURL || !CFURLCanBeDecomposed(serverURL)) {
if(serverURL) CFRelease(serverURL);
blesscontextprintf(context, kBLLogLevelError,
"Could not interpret %s as a URL\n", url);
return 2;
}
schemeString = CFURLCopyScheme(serverURL);
if (requiresScheme) {
requiredScheme = CFStringCreateWithCString(kCFAllocatorDefault,requiresScheme,kCFStringEncodingUTF8);
}
if(!schemeString || (requiredScheme && !CFEqual(schemeString, requiredScheme))) {
blesscontextprintf(context, kBLLogLevelError,
"Unrecognized scheme %s\n", BLGetCStringDescription(schemeString));
if(schemeString) CFRelease(schemeString);
if(requiredScheme) CFRelease(requiredScheme);
return 2;
}
if(!CFStringGetCString(schemeString,scheme,128,kCFStringEncodingUTF8)) {
blesscontextprintf(context, kBLLogLevelError,
"Can't interpret scheme as string\n");
return 3;
}
if(requiredScheme) CFRelease(requiredScheme);
CFRelease(schemeString);
interfaceString = CFURLCopyUserName(serverURL);
if(interfaceString == NULL) {
ret = BLGetPreferredNetworkInterface(context, interface);
if(ret) {
blesscontextprintf(context, kBLLogLevelError,
"Failed to determine preferred network interface\n");
return 1;
} else {
blesscontextprintf(context, kBLLogLevelVerbose,
"Preferred network interface is %s\n", interface);
}
} else {
if(!CFStringGetCString(interfaceString,interface,IF_NAMESIZE,kCFStringEncodingUTF8)) {
CFRelease(interfaceString);
blesscontextprintf(context, kBLLogLevelError,
"Can't interpret interface as string\n");
return 3;
}
if(!BLIsValidNetworkInterface(context, interface)) {
blesscontextprintf(context, kBLLogLevelError,
"%s is not a valid interface\n", interface);
return 4;
}
CFRelease(interfaceString);
}
blesscontextprintf(context, kBLLogLevelVerbose,
"Using interface %s\n", interface);
pathString = CFURLCopyStrictPath(serverURL, NULL);
// path component must be NULL or empty
if(requiresPath) {
if(pathString == NULL || CFEqual(pathString, CFSTR(""))) {
if(pathString) CFRelease(pathString);
blesscontextprintf(context, kBLLogLevelError,
"Specification must contain a path\n");
return 5;
}
if(!CFStringGetCString(pathString,path,MAXPATHLEN,kCFStringEncodingUTF8)) {
CFRelease(pathString);
blesscontextprintf(context, kBLLogLevelError,
"Can't interpret path as string\n");
return 5;
}
} else {
if(!(pathString == NULL || CFEqual(pathString, CFSTR("")))) {
CFRelease(pathString);
blesscontextprintf(context, kBLLogLevelError,
"Specification can't contain a path\n");
return 5;
}
path[0] = '\0';
}
if(pathString) CFRelease(pathString);
if(useBackslash) {
int i, len;
for(i=0, len=(int)strlen(path); i < len; i++) {
if(path[i] == '/') {
path[i] = '\\';
}
}
}
hostString = CFURLCopyHostName(serverURL);
// host must be present
if(hostString == NULL || CFEqual(hostString, CFSTR(""))) {
if(hostString) CFRelease(hostString);
blesscontextprintf(context, kBLLogLevelError,
"Specification doesn't contain host\n");
return 5;
}
if(!CFStringGetCString(hostString,host,NS_MAXDNAME,kCFStringEncodingUTF8)) {
CFRelease(hostString);
blesscontextprintf(context, kBLLogLevelError,
"Can't interpret host as string\n");
return 5;
}
CFRelease(hostString);
if(!validateAddress(host)) {
blesscontextprintf(context, kBLLogLevelError,
"Can't interpret host %s as an IPv4 address\n",
host);
return 6;
}
return 0;
}