Transferred from: http://blog.csdn.net/kailan818/article/details/6731772English Original: http://www.gratisoft.us/todd/papers/strlcpy.htmlEnglish Todd c. Miller, Theo de RaadtTranslator: Linhai MapleTranslation Address:
Many people already know how to use strncpy to replace strcpy to prevent Buffer Overflow. However, if you still need to consider the running efficiency, strlcpy may be a better way.
1. strcpy
We know that strcpy is judged based on \ 0. If the to
When an array is passed as a parameter to a function, it is a pointer rather than an array, and the first address of the array is passed, for example:Void func (char STR [1, 100]){......}
Then sizeof (STR) = 4When the STR array is declared as a
Why replace strncpy with strlcpyTitle: Why replace strncpy with strlcpyAuthor: DemonLinks: http://demon.tw/copy-paste/strlcpy-replace-strncpy.htmlCopyright: All articles of this blog are subject to the terms "Attribution-NonCommercial use-share 2.5
Usage of strncpy: The difference between strcpy and strcpy lies in copying n characters instead of copying all characters (including '\ 0' at the end ').Function prototype: char * strncpy (char * dst, const char * src, int n)When the src length is
strncpyUsage: It differs from strcpy copying n characters instead of copying all characters (including endings ‘\0‘ ).Function Prototypes:char * strncpy(char *dst,const char * src, int n)When src the length is less than n , the dst inside of the non-
strncpy and other major problems are still not overflow, but full of the buffer is not added 0 terminator, previously in the project itself also wrote a safe_strcpy now found alreadyhttp://blog.csdn.net/linyt/article/details/4383328Look for a bit,
strncpy () functionPrototype: extern char *strncpy (char *dest, char *src, int n);How to use: #include Function: Copies the first n bytes of the string that is referred to as the null end of SRC to the array referred to by Dest.Description: Assume
The definition string is automatically added to the rear. char *p = "Hello";
for (i=0;i{
printf ("%d\n", P[i]);
} 104 101 108 108 111 0 115
Note the hazard function:
1, the Dangerous function gets () function, should use Fgets ()Char *gets
Dnsspoof is a DNS Spoofing tool that provides the domain name to be redirected and the IP address to which the domain name is redirected.
: Http://monkey.org /~ Dugsong/dsniff/
Dnsspoof is one of the dsniff tool sets.Dnsspoof depends on two
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