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[NET] Accommodate K8s network namespaces.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| /******************************************************************************/ | ||
| /* */ | ||
| /* X r d N e t I d e n t i t y . h h */ | ||
| /* */ | ||
| /* (c) 2021 by the Board of Trustees of the Leland Stanford, Jr., University */ | ||
| /* Produced by Andrew Hanushevsky for Stanford University under contract */ | ||
| /* DE-AC02-76-SFO0515 with the Department of Energy */ | ||
| /* */ | ||
| /* This file is part of the XRootD software suite. */ | ||
| /* */ | ||
| /* XRootD is free software: you can redistribute it and/or modify it under */ | ||
| /* the terms of the GNU Lesser General Public License as published by the */ | ||
| /* Free Software Foundation, either version 3 of the License, or (at your */ | ||
| /* option) any later version. */ | ||
| /* */ | ||
| /* XRootD is distributed in the hope that it will be useful, but WITHOUT */ | ||
| /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */ | ||
| /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */ | ||
| /* License for more details. */ | ||
| /* */ | ||
| /* You should have received a copy of the GNU Lesser General Public License */ | ||
| /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */ | ||
| /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */ | ||
| /* */ | ||
| /* The copyright holder's institutional names and contributor's names may not */ | ||
| /* be used to endorse or promote products derived from this software without */ | ||
| /* specific prior written permission of the institution or contributor. */ | ||
| /******************************************************************************/ | ||
|
|
||
| #include <string.h> | ||
| #include <unistd.h> | ||
|
|
||
| #include "XrdNet/XrdNetAddr.hh" | ||
| #include "XrdNet/XrdNetIdentity.hh" | ||
| #include "XrdNet/XrdNetIF.hh" | ||
| #include "XrdOuc/XrdOucTList.hh" | ||
| #include "XrdSys/XrdSysE2T.hh" | ||
|
|
||
| /******************************************************************************/ | ||
| /* O n e T i m e S t a t i c I n i t i a l i z a t i o n */ | ||
| /******************************************************************************/ | ||
|
|
||
| namespace | ||
| { | ||
| char *getMyFQN(const char *&myDom, const char *&myErr) | ||
| { | ||
| XrdNetAddr theAddr; | ||
| XrdOucTList *ifList, *ifNow; | ||
| const char *dnsName, *domP; | ||
| char *theName[2] = {0}, *theDom[2] = {0}, hName[256]; | ||
| int hnLen; | ||
|
|
||
| // Obtain the host name, this is mandatory. | ||
| // | ||
| if (gethostname(hName, sizeof(hName))) | ||
| {myErr = XrdSysE2T(errno); myDom = 0; return 0;} | ||
| hnLen = strlen(hName); | ||
|
|
||
| // First step it to get all IP addresses configured on this machine | ||
| // | ||
| if (!XrdNetIF::GetIF(&ifList, &myErr)) | ||
| {myDom = 0; return strdup(hName);} | ||
|
|
||
| // Run through the interfaces and try to get the hostname associated with | ||
| // this machine. Note that we may have public and private addresses and | ||
| // they may have different hostname attached. We only accept the hostname | ||
| // that matches what is returned by gethostname(). | ||
| // | ||
| while((ifNow = ifList)) | ||
| {int i = (ifNow->sval[1] ? 1 : 0); // Private | public | ||
|
|
||
| if (i >= 0 && theName[i] == 0 && !theAddr.Set(ifNow->text, 0) | ||
| && (dnsName = theAddr.Name(0,&myErr)) && (domP = index(dnsName,'.'))) | ||
| {int n = domP - dnsName; | ||
| if (n == hnLen && !strncmp(hName, dnsName, n)) | ||
| {theName[i] = strdup(dnsName); | ||
| theDom[i] = theName[i] + n; | ||
| } | ||
| } | ||
| ifList = ifList->next; | ||
| delete ifNow; | ||
| } | ||
|
|
||
| // Fix up error pointer | ||
| // | ||
| if (myErr == 0) myErr = "no error"; | ||
|
|
||
| // We prefer the public name should we have it | ||
| // | ||
| if (theName[0]) | ||
| {if (theName[1]) free(theName[1]); | ||
| myDom = theDom[0]; | ||
| return theName[0]; | ||
| } | ||
|
|
||
| // Use the private name should we have it | ||
| // | ||
| if (theName[1]) | ||
| {myDom = theDom[1]; | ||
| return theName[1]; | ||
| } | ||
|
|
||
| // Concote a name using old-style DNS resolution. This may not work if | ||
| // DNS namespaces are being used (e.g. k8s environments). | ||
| // | ||
| if ((myErr = theAddr.Set(hName,0))) dnsName = 0; | ||
| else dnsName = theAddr.Name(0, &myErr); | ||
|
|
||
| // Check if this worked | ||
| // | ||
| if (dnsName) | ||
| {theName[0] = strdup(dnsName); | ||
| if (!(myDom = index(theName[0], '.'))) myDom = ""; | ||
| return theName[0]; | ||
| } | ||
|
|
||
| // Fallback to using the simple unqualified hostname, this still mae OK | ||
| // | ||
| theName[0] = strdup(hName); | ||
| myDom = theName[0] + hnLen; | ||
| return theName[0]; | ||
| } | ||
| } | ||
|
|
||
| /******************************************************************************/ | ||
| /* S t a t i c M e m b e r s */ | ||
| /******************************************************************************/ | ||
|
|
||
| // Note that we are gauranteed that this will be fully initialzed prior | ||
| // to any method called that uses these values irrespective of static | ||
| // initialization order, even though statically initialized. | ||
|
|
||
| const char *XrdNetIdentity::DNS_Domain; | ||
| const char *XrdNetIdentity::DNS_Error; | ||
| const char *XrdNetIdentity::DNS_FQN = getMyFQN(DNS_Domain, DNS_Error); | ||
|
|
||
| /******************************************************************************/ | ||
| /* D o m a i n */ | ||
| /******************************************************************************/ | ||
|
|
||
| const char *XrdNetIdentity::Domain(const char **eText) | ||
| { | ||
| if (eText) *eText = DNS_Error; | ||
| return DNS_Domain; | ||
| } | ||
|
|
||
| /******************************************************************************/ | ||
| /* F Q N */ | ||
| /******************************************************************************/ | ||
|
|
||
| const char *XrdNetIdentity::FQN(const char **eText) | ||
| { | ||
| if (eText) *eText = DNS_Error; | ||
| return DNS_FQN; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| #ifndef __NETIDENTITY__ | ||
| #define __NETIDENTITY__ | ||
| /******************************************************************************/ | ||
| /* */ | ||
| /* X r d N e t I d e n t i t y . h h */ | ||
| /* */ | ||
| /* (c) 2021 by the Board of Trustees of the Leland Stanford, Jr., University */ | ||
| /* Produced by Andrew Hanushevsky for Stanford University under contract */ | ||
| /* DE-AC02-76-SFO0515 with the Department of Energy */ | ||
| /* */ | ||
| /* This file is part of the XRootD software suite. */ | ||
| /* */ | ||
| /* XRootD is free software: you can redistribute it and/or modify it under */ | ||
| /* the terms of the GNU Lesser General Public License as published by the */ | ||
| /* Free Software Foundation, either version 3 of the License, or (at your */ | ||
| /* option) any later version. */ | ||
| /* */ | ||
| /* XRootD is distributed in the hope that it will be useful, but WITHOUT */ | ||
| /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */ | ||
| /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */ | ||
| /* License for more details. */ | ||
| /* */ | ||
| /* You should have received a copy of the GNU Lesser General Public License */ | ||
| /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */ | ||
| /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */ | ||
| /* */ | ||
| /* The copyright holder's institutional names and contributor's names may not */ | ||
| /* be used to endorse or promote products derived from this software without */ | ||
| /* specific prior written permission of the institution or contributor. */ | ||
| /******************************************************************************/ | ||
|
|
||
| class XrdNetIdentity | ||
| { | ||
| public: | ||
|
|
||
| static const char *Domain(const char **eText=0); | ||
|
|
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| static const char *FQN(const char **etext=0); | ||
|
|
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| XrdNetIdentity() {} | ||
| ~XrdNetIdentity() {} | ||
|
|
||
| private: | ||
|
|
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| static const char *DNS_FQN; | ||
| static const char *DNS_Domain; // Starts with leading dot! | ||
| static const char *DNS_Error; // Error indicator for debugging only | ||
| }; | ||
| #endif |
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