slacky.eu

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        if (search_string) {
                uint8_t *body;
                uint32_t bodylen;
                if (strnstr((char *)body, search_string, bodylen) == 0) {
                        return (0);
                }

        }

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onftest.c:72: undefined reference to `strnstr'
collect2: ld returned 1 exit status
configure:5205: $? = 1
configure: failed program was:
| /* confdefs.h.  */
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE ""
| #define VERSION "1.0"
| #define __USE_BSD 1
| #define HAVE_LIBNSL 1
| #define STDC_HEADERS 1
| #define HAVE_SYS_WAIT_H 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_FCNTL_H 1
| #define HAVE_SYS_IOCTL_H 1
| #define HAVE_SYS_TIME_H 1
| #define HAVE_UNISTD_H 1
| #define TIME_WITH_SYS_TIME 1
| #define RETSIGTYPE void
| #define HAVE_GETTIMEOFDAY 1
| #define HAVE_SELECT 1
| #define HAVE_SOCKET 1
| #define HAVE_STRDUP 1
| #define HAVE_STRERROR 1
| #define HAVE_STRTOL 1
| #define HAVE_SETEUID 1
| #define HAVE_ERR 1
| #define HAVE_STRSEP 1
| /* end confdefs.h.  */
| /* Define strnstr to an innocuous variant, in case <limits.h> declares strnstr.
|    For example, HP-UX 11i <limits.h> declares gettimeofday.  */
| #define strnstr innocuous_strnstr
|
| /* System header to define __stub macros and hopefully few prototypes,
|     which can conflict with char strnstr (); below.
|     Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
|     <limits.h> exists even on freestanding compilers.  */
|
| #ifdef __STDC__
| # include <limits.h>
| #else
| # include <assert.h>
| #endif
|
| #undef strnstr
|
| /* Override any GCC internal prototype to avoid an error.
|    Use char because int might match the return type of a GCC
|    builtin and then its argument prototype would still apply.  */
| #ifdef __cplusplus
| extern "C"
| #endif
| char strnstr ();
| /* The GNU C library defines this for functions which it implements
|     to always fail with ENOSYS.  Some functions are actually named
|     something starting with __ and the normal name is an alias.  */
| #if defined __stub_strnstr || defined __stub___strnstr
| choke me
| #endif
|
| int
| main ()
| {
| return strnstr ();
|   ;
|   return 0;
| }
configure:5223: result: no

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char *
strnstr(const char *body, const char *string_search, size_t bodylen)
{
    char *str = strstr(body, string_search);
    if (!str)
        return NULL;
    if (str-body+strlen(string_search) <= bodylen)
        return str;
    else
        return NULL;
}

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       The  strstr()  function  finds the first occurrence of the substring needle in the string haystack.  The
       terminating '\0' characters are not compared.

       The strcasestr() function is like strstr(), but ignores the case of both arguments.

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     The strstr() function locates the first occurrence of the null-terminated
     string s2 in the null-terminated string s1.

     The strcasestr() function is similar to strstr(), but ignores the case of
     both strings.

     The strnstr() function locates the first occurrence of the null-termi-
     nated string s2 in the string s1, where not more than n characters are
     searched.  Characters that appear after a `\0' character are not
     searched.  Since the strnstr() function is a FreeBSD specific API, it
     should only be used when portability is not a concern.

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#include <sys/types.h>
 #include <string.h>

  char *
  strnstr(const char *s, const char *find, size_t slen)
  {
  	char c, sc;
  	size_t len;
  
  	if ((c = *find++) != '\0') {
  		len = strlen(find);
  		do {
  			do {
  				if (slen < 1 || (sc = *s) == '\0')
 					return (NULL);
 				--slen;
 				++s;
 			} while (sc != c);
 			if (len > slen)
 				return (NULL);
 		} while (strncmp(s, find, len) != 0);
 		s--;
 	}
	return (__DECONST(char *, s));
 }
 

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 sed -i 's/strnstr/strncasecmp/g' dnsreader.c  

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autoreconf
configure
make