6 ms·

It's also at 010.010.2056 or 0x8080808 or 01002004010. I made a little tool a while ago that iterates over all the options that I know of: https://lucb1e.com/r

• ktpsns 5y ago
  +1 for <?php if (isset($_GET['source'])) { highlight_file(__FILE__); exit; } This is such a useful and nice snippet I add to many of my PHP files. Open Source at its finest, literally "in place" :-)
  • cpach 5y ago
    What does it do?
    • pbiggar 5y ago
      If you provide the GET parameter "source" (which means you try /the-url?source"), it prints a pretty-printed version of the source code. So basically it allows the reader to read the source directly without hunting it down on github of something.
      • keymone 5y ago
        Doesn’t this just highlight that php development ecosystem doesn’t value quality much? What even is a “file” in context of a web request? What about dependencies or logic defined in other files? This is just bizarre, I can’t see a sane codebase where this would be preferable to going on GitHub and pressing “.”
        • jbboehr 5y ago
          __FILE__ returns the path to the source file in which it's used. It's from C's equivalent preprocessor macro.
        • chmod775 5y ago
          > Doesn’t this just highlight that php development ecosystem doesn’t value quality much? As opposed to which web development ecosystem exactly? The only web development ecosystem with overall decent quality software that I could come up with is Java, and their understanding of quality is... enterprise-y. Give me a mature PHP framework over a NPM dependency tree, python web framework, or ruby on rails any day. At least when looking for 'quality'. Relatively.
          • wyclif 5y ago
            Which PHP frameworks do you have in mind?
            • yurishimo 5y ago
              Laravel, or any Symphony based framework is a great choice. PHP is a very modern and mature language at this point. If the first thing you think of is Wordpress, then you’re behind.
              • keymone 5y ago
                And how relevant do you think highlight_file is for symphony or laravel?
                • yurishimo 5y ago
                  Probably none.
              • andrewmackrodt 5y ago
                I agree with these points although going back to the grandparent comment, the value of being able to show the source code of a controller with these frameworks by appending a query string is close to zero.
    • nikeee 5y ago
      It prints the source off itself, when source is present as a query parameter: https://lucb1e.com/randomprojects/php/funnip.php?source https://lucb1e.com/randomprojects/php/funnip.php?source
  • deleted 5y ago
    [deleted]
• jeffbee 5y ago
  It's weird that this is just a side-effect of the way strtol works, but there's no way (that I can figure out) to get + or - involved.
  • lucb1e 5y ago
    It can't only be that, or 127.1 would not work. It is doing some parsing beyond just calling a parseInt on each of them in order to recognize domain names and use name resolution rather than directly putting the bytes in the IP header. That must be why 0x9000000.-16250872 doesn't work (if negative worked, that should also resolve to 8.8.8.8).
    • dharmab 5y ago
      I looked into this a while back, IIRC BSD added the "omit zeroes" as a nonstandard convenience feature and other OSes copied it. I'm far afk for I'd find my notes on this.
      • scbrg 5y ago
        It's not "omit zeroes". It's, "represent the last three octets with just one integer". 127.256 is valid, and would be equivalent to 127.0.1.0. The last integer can be up to 16777215 (2²⁴-1). Similarly, if you instead include three groups of integers, the first two represents one octet each, and the last represents two. 127.2.256 is equivalent to 127.2.1.0.
    • mitchs 5y ago
      All of this weird behavior is generally inet_aton. https://linux.die.net/man/3/inet_aton https://linux.die.net/man/3/inet_aton
• 1vuio0pswjnm7 5y ago
  This program, "ip4dec", converts lists of IPv4 addresses to decimal. Wrote this while experimenting with storing domain->ip mappings in a trie, such as https://github.com/tlwg/libdatrie https://github.com/tlwg/libdatrie Name borrowed from https://github.com/ian-hamlin/ipdec https://github.com/ian-hamlin/ipdec Note the trietool "list" command prints data as %d not %u. To fix, edit list_enum_func() in trietool.c sed -n 's/ //;wip4dec.l' << eof /* not a domain name or ip address validator input file format: (left-justified, no leading spaces) example.com 93.184.216.34 example.net 93.184.216.34 comment */ int fileno(FILE *); int setenv(const char*,const char*,int); int unsetenv(const char*); #define echo do{if(fwrite(yytext,(size_t)yyleng,1,yyout)){}}while(0) #define jmp (yy_start) = 1 + 2 * int x=0,y=0,o=0; xa [0-9]{1,3}\x2e xb [0-9]{1,3} xc [0-9]{4,5} xd ^[A-Za-z0-9\.-]* xe ^[^A-Za-z0-9] %s xa %option noyywrap nounput noinput %% {xd} if(yytext[0]=='-'||yytext[0]=='.')jmp 0;else{o=0;y=0;x=0;setenv("x",yytext,1);jmp xa;} {xe} jmp 0; <xa>{xc} jmp 0; <xa>{xa}|{xb} { switch(o){ case 0: y=atoi(yytext);if(y<1)break;x=y*16777216;y=0;o++;break; case 1: y=atoi(yytext);if(y>255)break;x=x+y*65536;y=0;o++;break; case 2: y=atoi(yytext);if(y>255)break;x=x+y*256;y=0;o++;break; case 3: y=atoi(yytext);if(y>255)break;x=x+y;printf("%s\t%u\n",getenv("x"),x);unsetenv("x");break; default: break; } } .|\n %% int main(){ yylex();exit(0) ;} eof flex -8iCrf ip4dec.l cc -std=c89 -Wall -pedantic -I. -pipe lex.yy.c -static -o ip4dec usage: ip4dec < input-file example: echo example.com 93.184.216.34 icann|ip4dec output: example.com 1572395042
• deleted 5y ago
  [deleted]
• deleted 5y ago
  [deleted]
• 1vuio0pswjnm7 5y ago
  This program, "ip4dec", converts lists of IPv4 addresses to decimal and prints them as unsigned integers. Wrote this while experimenting with storing domain->ip mappings in a trie, such as https://github.com/tlwg/libdatrie https://github.com/tlwg/libdatrie Name borrowed from https://github.com/ian-hamlin/ipdec https://github.com/ian-hamlin/ipdec Note the trietool "list" command prints data as decimal not unsigned integer. sed -n 's/ //;wip4dec.l' << eof /* not a domain name or ip address validator input file format: (left-justified, no leading spaces) example.com 93.184.216.34 example.net 93.184.216.34 comment */ int fileno(FILE *); int setenv(const char*,const char*,int); int unsetenv(const char*); #define echo do{if(fwrite(yytext,(size_t)yyleng,1,yyout)){}}while(0) #define jmp (yy_start) = 1 + 2 * int x=0,y=0,o=0; xa [0-9]{1,3}\x2e xb [0-9]{1,3} xc [0-9]{4,5} xd ^[A-Za-z0-9\.-]+ xe ^[^A-Za-z0-9] %s xa %option noyywrap nounput noinput %% {xd} if(yytext[0]=='-'||yytext[0]=='.')jmp 0;else{o=0;y=0;x=0;setenv("x",yytext,1);jmp xa;} {xe} jmp 0; <xa>{xc} jmp 0; <xa>{xa}|{xb} { switch(o){ case 0: y=atoi(yytext);if(y<1)break;x=y*16777216;y=0;o++;break; case 1: y=atoi(yytext);if(y>255)break;x=x+y*65536;y=0;o++;break; case 2: y=atoi(yytext);if(y>255)break;x=x+y*256;y=0;o++;break; case 3: y=atoi(yytext);if(y>255)break;x=x+y;printf("%s\t%u\n",getenv("x"),x);unsetenv("x");break; default: break; } } .|\n %% int main(){ yylex();exit(0) ;} eof flex -8iCrf ip4dec.l cc -std=c89 -Wall -pedantic -I. -pipe lex.yy.c -static -o ip4dec usage: ip4dec < input-file
• floatingatoll 5y ago
  Octal is a great way to mislead both human beings and software, and I kind of hope it gets removed by browsers as a result of this new attention. It’s one of those things that isn’t productive or useful in any way in our modern era and serves only to complicate with no benefit in return.
  • broodbucket 5y ago
    Probably useless in the browser, but who uses octal in general? I assume it's still important in some areas (networking?) but I don't actually know. Only thing I can think of personally is UNIX file permissions.
    • floatingatoll 5y ago
      I would refuse any PR that used octal unnecessarily, and I generally ask people to use chmod plus-addressing rather than octal where possible, so that there’s a lower risk of math errors and a higher chance of good review. 0644|0755: a=rX,u+w 0600: u=rw Etc.
      • broodbucket 5y ago
        This is funny for me to read because I converted a bunch of constants for file permissions to octal values in the Linux kernel because they're harder to read and there's multiple ways of arriving at the same value. You wanna look up what a constant is and you find #define S_IRUGO (S_IRUSR|S_IRGRP|S_IROTH) or you could see 0444 and immediately know what it means. I agree in cases where you're modifying existing permissions it's much better to do a `chmod u+w` than to replace the whole thing with octal. When you're defining permissions at the time of creation though, everyone can parse 0644 at a glance. a=rX,u+w isn't so bad but I don't know if I'd prefer it personally, in code where you can't use chmod syntax I'm definitely preferring octal.
        • floatingatoll 5y ago
          How do you represent a=rX in octal?