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Overview
Comment:Replaced the call to the undocumented ns_name_uncompress() function with dn_expand(), which is documented, at least on OpenBSD, and it's shorter. Then made ns_name_uncompress() and __ns_name_uncompress() fallbacks for this, with suitable autosetup tests for all of it.
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SHA3-256: d0fb5ac7cae085d60804115d7abfbfbbd9596a98da620e2e530b151c21b3aa46
User & Date: wyoung 2018-09-22 16:38:50
Context
2018-09-22
16:55
Removed the "Linux" platform test from the DNS MX stuff in src/smtp.c. You should always test for features, not platforms, and we've now got the feature tests we need to replace this too-broad platform test. (check-in: 5358fe95 user: wyoung tags: libbind-ns-alternative)
16:38
Replaced the call to the undocumented ns_name_uncompress() function with dn_expand(), which is documented, at least on OpenBSD, and it's shorter. Then made ns_name_uncompress() and __ns_name_uncompress() fallbacks for this, with suitable autosetup tests for all of it. (check-in: d0fb5ac7 user: wyoung tags: libbind-ns-alternative)
06:57
Fix to previous for CentOS 7. (check-in: c7640b38 user: tangent tags: libbind-ns-alternative)
Changes
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Changes to auto.def.

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# The SMTP module requires special libraries and headers for MX DNS
# record lookups and such.
cc-check-includes arpa/nameser.h
cc-include-needs bind/resolv.h netinet/in.h
cc-check-includes bind/resolv.h
cc-check-includes resolv.h

if {    ![cc-check-function-in-lib   ns_name_uncompress {resolv bind}] &&
        ![cc-check-function-in-lib __ns_name_uncompress {resolv bind}]} {


    msg-result "WARNING: SMTP feature will not be able to look up local MX."
}
cc-check-function-in-lib res_query resolv
cc-check-function-in-lib res_9_ns_initparse resolv

# Other nonstandard function checks
cc-check-functions utime
cc-check-functions usleep
cc-check-functions strchrnul
cc-check-functions pledge







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# The SMTP module requires special libraries and headers for MX DNS
# record lookups and such.
cc-check-includes arpa/nameser.h
cc-include-needs bind/resolv.h netinet/in.h
cc-check-includes bind/resolv.h
cc-check-includes resolv.h
if {    (![cc-check-function-in-lib dn_expand resolv] ||
         ![cc-check-function-in-lib   ns_name_uncompress {bind resolv}] ||
         ![cc-check-function-in-lib __ns_name_uncompress {bind resolv}]) &&
        (![cc-check-function-in-lib   res_query {bind resolv}] ||
         ![cc-check-function-in-lib __res_query {bind resolv}])} {
    msg-result "WARNING: SMTP feature will not be able to look up local MX."
}

cc-check-function-in-lib res_9_ns_initparse resolv

# Other nonstandard function checks
cc-check-functions utime
cc-check-functions usleep
cc-check-functions strchrnul
cc-check-functions pledge

Changes to src/smtp.c.

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**
** Implementation of SMTP (Simple Mail Transport Protocol) according
** to RFC 5321.
*/
#include "config.h"
#include "smtp.h"
#include <assert.h>
#if HAVE___NS_NAME_UNCOMPRESS || HAVE_NS_NAME_UNCOMPRES || \
    (defined(__linux__) && !defined(FOSSIL_OMIT_DNS))
#  include <sys/types.h>
#  include <netinet/in.h>
#  if defined(HAVE_BIND_RESOLV_H)
#    include <bind/resolv.h>
#    include <bind/arpa/nameser_compat.h>
#  else
#    include <arpa/nameser.h>
#    include <resolv.h>
#  endif



#  if defined(HAVE__NS_NAME_UNCOMPRESS) && !defined(ns_name_uncompress)
#    define ns_name_uncompress __ns_name_uncompress
#  endif
#  define FOSSIL_UNIX_STYLE_DNS 1
#endif
#if defined(_WIN32) && !defined(__MINGW32__) && !defined(__MINGW64__)
#  include <windows.h>
#  include <windns.h>
#  define FOSSIL_WINDOWS_STYLE_DNS 1
................................................................................
      if( priority<iBestPriority ){
        pBest = p;
        iBestPriority = priority;
      }
    }
  }
  if( pBest ){
    ns_name_uncompress(aDns, aDns+nDns, pBest+2,
                       zHostname, sizeof(zHostname));
    return fossil_strdup(zHostname);
  }
  return 0;
#elif defined(FOSSIL_WINDOWS_STYLE_DNS)
  DNS_STATUS status;           /* Return status */
  PDNS_RECORDA pDnsRecord, p;  /* Pointer to DNS_RECORD structure */
  int iBestPriority = 9999999; /* Best priority */







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**
** Implementation of SMTP (Simple Mail Transport Protocol) according
** to RFC 5321.
*/
#include "config.h"
#include "smtp.h"
#include <assert.h>
#if HAVE_DN_EXPAND || HAVE___NS_NAME_UNCOMPRESS || HAVE_NS_NAME_UNCOMPRES || \
    (defined(__linux__) && !defined(FOSSIL_OMIT_DNS))
#  include <sys/types.h>
#  include <netinet/in.h>
#  if defined(HAVE_BIND_RESOLV_H)
#    include <bind/resolv.h>
#    include <bind/arpa/nameser_compat.h>
#  else
#    include <arpa/nameser.h>
#    include <resolv.h>
#  endif
#  if defined(HAVENS_NAME_UNCOMPRESS) && !defined(dn_expand)
#    define dn_expand ns_name_uncompress
#  endif
#  if defined(HAVE__NS_NAME_UNCOMPRESS) && !defined(dn_expand)
#    define dn_expand __ns_name_uncompress
#  endif
#  define FOSSIL_UNIX_STYLE_DNS 1
#endif
#if defined(_WIN32) && !defined(__MINGW32__) && !defined(__MINGW64__)
#  include <windows.h>
#  include <windns.h>
#  define FOSSIL_WINDOWS_STYLE_DNS 1
................................................................................
      if( priority<iBestPriority ){
        pBest = p;
        iBestPriority = priority;
      }
    }
  }
  if( pBest ){

    dn_expand(aDns, aDns+nDns, pBest+2, zHostname, sizeof(zHostname));
    return fossil_strdup(zHostname);
  }
  return 0;
#elif defined(FOSSIL_WINDOWS_STYLE_DNS)
  DNS_STATUS status;           /* Return status */
  PDNS_RECORDA pDnsRecord, p;  /* Pointer to DNS_RECORD structure */
  int iBestPriority = 9999999; /* Best priority */