Adhere to Postel's Law.

That is, be liberal when parsing key/value parameters from remote.
Along with configure switch to disable it.

2 files changed, 23 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 8397914..19e7832 100644
--- a/configure.ac
+++ b/configure.ac
@@ -72,12 +72,19 @@ curl_ssl_verify_peer="true"
 AC_ARG_ENABLE([ssl-verify-peer],
  AC_HELP_STRING([--disable-ssl-verify-peer],[disable cURL cert validity verification]),
  [ test "${enableval}" = "no" && curl_ssl_verify_peer="false" ]
 )
 ${curl_ssl_verify_peer} || AC_DEFINE([DISABLE_CURL_SSL_VERIFYPEER],,[defined if cURL is not to verify cert validity])
 
+postels_law=true
+AC_ARG_ENABLE([postels-law],
+ AC_HELP_STRING([--disable-postels-law],[Be strict, do not adhere to Postel's Law ("be conservative in what you do, be liberal in what you accept from others", RFC 793)]),
+ [ test "${enableval}" = "no" && postels_law=false ]
+)
+$postels_law && AC_DEFINE([POSTELS_LAW],,[defined if we want to adhere to Postel's Law])
+
 AC_CONFIG_FILES([
  Makefile
   libopkele.pc
   Doxyfile
  include/Makefile
  lib/Makefile
diff --git a/lib/params.cc b/lib/params.cc
index b181811..ea86d3a 100644
--- a/lib/params.cc
+++ b/lib/params.cc
@@ -1,12 +1,14 @@
 #include <opkele/types.h>
 #include <opkele/exception.h>
 #include <opkele/util.h>
 #include <openssl/sha.h>
 #include <openssl/hmac.h>
 
+#include "config.h"
+
 namespace opkele {
     using namespace std;
 
     bool params_t::has_param(const string& n) const {
         return find(n)!=end();
     }
@@ -27,18 +29,32 @@ namespace opkele {
         clear();
         string::size_type p = 0;
         while(true) {
             string::size_type co = kv.find(':',p);
             if(co==string::npos)
                 break;
+#ifndef POSTELS_LAW
             string::size_type nl = kv.find('\n',co+1);
             if(nl==string::npos)
                 throw bad_input(OPKELE_CP_ "malformed input");
             if(nl>co)
                 insert(value_type(kv.substr(p,co-p),kv.substr(co+1,nl-co-1)));
             p = nl+1;
+#else /* POSTELS_LAW */
+            string::size_type lb = kv.find_first_of("\r\n",co+1);
+            if(lb==string::npos) {
+                insert(value_type(kv.substr(p,co-p),kv.substr(co+1)));
+                break;
+            }
+            if(lb>co)
+                insert(value_type(kv.substr(p,co-p),kv.substr(co+1,lb-co-1)));
+            string::size_type nolb = kv.find_first_not_of("\r\n",lb);
+            if(nolb==string::npos)
+                break;
+            p = nolb;
+#endif /* POSTELS_LAW */
         }
     }
 
     void params_t::sign(secret_t secret,string& sig,const string& slist,const char *prefix) const {
         string kv;
         string::size_type p = 0;