parsing - Fast(est) way to get X-Forwarded-for in header with G-Wan? -

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since non-rfc header field isn't in http_env nor http_t struct, wrote snippet :

  //get reply buffer   xbuf_t *reply = get_reply(argv);    // init & create json buffer   xbuf_t json_buf;   xbuf_init(&json_buf);   jsn_t *params = jsn_add_node(0, "params");    [...]    http_t *http = (http_t*)get_env(argv, http_headers);   xbuf_t *read_buf  = (xbuf_t*)get_env(argv, read_xbuf);    [...]    // add remote ip (from x-forwarded-for or remote_addr)   char *xforward = xbuf_findstr(read_buf, "x-forwarded-for:");   if(xforward) {     jsn_add_string(params, "ip", xforward);   } else {     jsn_add_string(params, "ip", get_env(argv, remote_addr));   }

the json part is, of course, part of application , irrelevant question. think it's right way or xbuf_findstr() inefficient , there faster solution (without using asm or cryptic code) ?

thank :)

edit : wow, forgot strok() part rid of first field, want ip adress of course.

edit2 : patched version strtok

  // add remote ip (from x-forwarded-for or remote_addr)   char *xforward = xbuf_findstr(read_buf, "x-forwarded-for: ");   if(xforward) {     gc_init(argv, 1024);     char *copy = gc_malloc(argv, strlen(xforward)+ 1);     memcpy(copy, xforward, strlen(xforward) + 1);     strtok(copy, ":");     char *ip = strtok(0,"\r");     while (*ip == ' ') ip++;      // trim leading space     jsn_add_string(params, "ip", ip);   } else {     jsn_add_string(params, "ip", get_env(argv, remote_addr));   }

fastest way?

if code executed after http request parsing g-wan state start searching "x-forwarded-for: " closest place (another http header) instead of doing start of request.

there no way faster xbuf_findstr(). string search methods faster others depending on length of input data, , not significant here.

"x-forwarded-for: " parsed g-wan in past have implemented proxy feature in g-wan, , since "x-forwarded-for: " header can fake, removed parser.


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