Adding upstream version 2.9.5.upstream/2.9.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1433 insertions, 0 deletions

diff --git a/src/http.c b/src/http.c
new file mode 100644
index 0000000..9599e0e
--- /dev/null
+++ b/src/http.c
@@ -0,0 +1,1433 @@
+/*
+ * HTTP semantics
+ *
+ * Copyright 2000-2018 Willy Tarreau <w@1wt.eu>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <ctype.h>
+#include <haproxy/api.h>
+#include <haproxy/http.h>
+#include <haproxy/tools.h>
+
+/* It is about twice as fast on recent architectures to lookup a byte in a
+ * table than to perform a boolean AND or OR between two tests. Refer to
+ * RFC2616/RFC5234/RFC7230 for those chars. A token is any ASCII char that is
+ * neither a separator nor a CTL char. An http ver_token is any ASCII which can
+ * be found in an HTTP version, which includes 'H', 'T', 'P', '/', '.' and any
+ * digit. Note: please do not overwrite values in assignment since gcc-2.95
+ * will not handle them correctly. It's worth noting that chars 128..255 are
+ * nothing, not even control chars.
+ */
+const unsigned char http_char_classes[256] = {
+	[  0] = HTTP_FLG_CTL,
+	[  1] = HTTP_FLG_CTL,
+	[  2] = HTTP_FLG_CTL,
+	[  3] = HTTP_FLG_CTL,
+	[  4] = HTTP_FLG_CTL,
+	[  5] = HTTP_FLG_CTL,
+	[  6] = HTTP_FLG_CTL,
+	[  7] = HTTP_FLG_CTL,
+	[  8] = HTTP_FLG_CTL,
+	[  9] = HTTP_FLG_SPHT | HTTP_FLG_LWS | HTTP_FLG_SEP | HTTP_FLG_CTL,
+	[ 10] = HTTP_FLG_CRLF | HTTP_FLG_LWS | HTTP_FLG_CTL,
+	[ 11] = HTTP_FLG_CTL,
+	[ 12] = HTTP_FLG_CTL,
+	[ 13] = HTTP_FLG_CRLF | HTTP_FLG_LWS | HTTP_FLG_CTL,
+	[ 14] = HTTP_FLG_CTL,
+	[ 15] = HTTP_FLG_CTL,
+	[ 16] = HTTP_FLG_CTL,
+	[ 17] = HTTP_FLG_CTL,
+	[ 18] = HTTP_FLG_CTL,
+	[ 19] = HTTP_FLG_CTL,
+	[ 20] = HTTP_FLG_CTL,
+	[ 21] = HTTP_FLG_CTL,
+	[ 22] = HTTP_FLG_CTL,
+	[ 23] = HTTP_FLG_CTL,
+	[ 24] = HTTP_FLG_CTL,
+	[ 25] = HTTP_FLG_CTL,
+	[ 26] = HTTP_FLG_CTL,
+	[ 27] = HTTP_FLG_CTL,
+	[ 28] = HTTP_FLG_CTL,
+	[ 29] = HTTP_FLG_CTL,
+	[ 30] = HTTP_FLG_CTL,
+	[ 31] = HTTP_FLG_CTL,
+	[' '] = HTTP_FLG_SPHT | HTTP_FLG_LWS | HTTP_FLG_SEP,
+	['!'] = HTTP_FLG_TOK,
+	['"'] = HTTP_FLG_SEP,
+	['#'] = HTTP_FLG_TOK,
+	['$'] = HTTP_FLG_TOK,
+	['%'] = HTTP_FLG_TOK,
+	['&'] = HTTP_FLG_TOK,
+	[ 39] = HTTP_FLG_TOK,
+	['('] = HTTP_FLG_SEP,
+	[')'] = HTTP_FLG_SEP,
+	['*'] = HTTP_FLG_TOK,
+	['+'] = HTTP_FLG_TOK,
+	[','] = HTTP_FLG_SEP,
+	['-'] = HTTP_FLG_TOK,
+	['.'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['/'] = HTTP_FLG_SEP | HTTP_FLG_VER,
+	['0'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['1'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['2'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['3'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['4'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['5'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['6'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['7'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['8'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	['9'] = HTTP_FLG_TOK | HTTP_FLG_VER | HTTP_FLG_DIG,
+	[':'] = HTTP_FLG_SEP,
+	[';'] = HTTP_FLG_SEP,
+	['<'] = HTTP_FLG_SEP,
+	['='] = HTTP_FLG_SEP,
+	['>'] = HTTP_FLG_SEP,
+	['?'] = HTTP_FLG_SEP,
+	['@'] = HTTP_FLG_SEP,
+	['A'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['B'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['C'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['D'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['E'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['F'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['G'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['H'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['I'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['J'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['K'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['L'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['M'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['N'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['O'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['P'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['Q'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['R'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['S'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['T'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['U'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['V'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['W'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['X'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['Y'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['Z'] = HTTP_FLG_TOK | HTTP_FLG_VER,
+	['['] = HTTP_FLG_SEP,
+	[ 92] = HTTP_FLG_SEP,
+	[']'] = HTTP_FLG_SEP,
+	['^'] = HTTP_FLG_TOK,
+	['_'] = HTTP_FLG_TOK,
+	['`'] = HTTP_FLG_TOK,
+	['a'] = HTTP_FLG_TOK,
+	['b'] = HTTP_FLG_TOK,
+	['c'] = HTTP_FLG_TOK,
+	['d'] = HTTP_FLG_TOK,
+	['e'] = HTTP_FLG_TOK,
+	['f'] = HTTP_FLG_TOK,
+	['g'] = HTTP_FLG_TOK,
+	['h'] = HTTP_FLG_TOK,
+	['i'] = HTTP_FLG_TOK,
+	['j'] = HTTP_FLG_TOK,
+	['k'] = HTTP_FLG_TOK,
+	['l'] = HTTP_FLG_TOK,
+	['m'] = HTTP_FLG_TOK,
+	['n'] = HTTP_FLG_TOK,
+	['o'] = HTTP_FLG_TOK,
+	['p'] = HTTP_FLG_TOK,
+	['q'] = HTTP_FLG_TOK,
+	['r'] = HTTP_FLG_TOK,
+	['s'] = HTTP_FLG_TOK,
+	['t'] = HTTP_FLG_TOK,
+	['u'] = HTTP_FLG_TOK,
+	['v'] = HTTP_FLG_TOK,
+	['w'] = HTTP_FLG_TOK,
+	['x'] = HTTP_FLG_TOK,
+	['y'] = HTTP_FLG_TOK,
+	['z'] = HTTP_FLG_TOK,
+	['{'] = HTTP_FLG_SEP,
+	['|'] = HTTP_FLG_TOK,
+	['}'] = HTTP_FLG_SEP,
+	['~'] = HTTP_FLG_TOK,
+	[127] = HTTP_FLG_CTL,
+};
+
+const int http_err_codes[HTTP_ERR_SIZE] = {
+	[HTTP_ERR_200] = 200,  /* used by "monitor-uri" */
+	[HTTP_ERR_400] = 400,
+	[HTTP_ERR_401] = 401,
+	[HTTP_ERR_403] = 403,
+	[HTTP_ERR_404] = 404,
+	[HTTP_ERR_405] = 405,
+	[HTTP_ERR_407] = 407,
+	[HTTP_ERR_408] = 408,
+	[HTTP_ERR_410] = 410,
+	[HTTP_ERR_413] = 413,
+	[HTTP_ERR_421] = 421,
+	[HTTP_ERR_422] = 422,
+	[HTTP_ERR_425] = 425,
+	[HTTP_ERR_429] = 429,
+	[HTTP_ERR_500] = 500,
+	[HTTP_ERR_501] = 501,
+	[HTTP_ERR_502] = 502,
+	[HTTP_ERR_503] = 503,
+	[HTTP_ERR_504] = 504,
+};
+
+const char *http_err_msgs[HTTP_ERR_SIZE] = {
+	[HTTP_ERR_200] =
+	"HTTP/1.1 200 OK\r\n"
+	"Content-length: 58\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>200 OK</h1>\nService ready.\n</body></html>\n",
+
+	[HTTP_ERR_400] =
+	"HTTP/1.1 400 Bad request\r\n"
+	"Content-length: 90\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Connection: close\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>400 Bad request</h1>\nYour browser sent an invalid request.\n</body></html>\n",
+
+	[HTTP_ERR_401] =
+	"HTTP/1.1 401 Unauthorized\r\n"
+	"Content-length: 112\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>401 Unauthorized</h1>\nYou need a valid user and password to access this content.\n</body></html>\n",
+
+	[HTTP_ERR_403] =
+	"HTTP/1.1 403 Forbidden\r\n"
+	"Content-length: 93\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>403 Forbidden</h1>\nRequest forbidden by administrative rules.\n</body></html>\n",
+
+	[HTTP_ERR_404] =
+	"HTTP/1.1 404 Not Found\r\n"
+	"Content-length: 83\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>404 Not Found</h1>\nThe resource could not be found.\n</body></html>\n",
+
+	[HTTP_ERR_405] =
+	"HTTP/1.1 405 Method Not Allowed\r\n"
+	"Content-length: 146\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>405 Method Not Allowed</h1>\nA request was made of a resource using a request method not supported by that resource\n</body></html>\n",
+
+	[HTTP_ERR_407] =
+	"HTTP/1.1 407 Unauthorized\r\n"
+	"Content-length: 112\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>407 Unauthorized</h1>\nYou need a valid user and password to access this content.\n</body></html>\n",
+
+	[HTTP_ERR_408] =
+	"HTTP/1.1 408 Request Time-out\r\n"
+	"Content-length: 110\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Connection: close\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>408 Request Time-out</h1>\nYour browser didn't send a complete request in time.\n</body></html>\n",
+
+	[HTTP_ERR_410] =
+	"HTTP/1.1 410 Gone\r\n"
+	"Content-length: 114\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>410 Gone</h1>\nThe resource is no longer available and will not be available again.\n</body></html>\n",
+
+	[HTTP_ERR_413] =
+	"HTTP/1.1 413 Payload Too Large\r\n"
+	"Content-length: 106\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>413 Payload Too Large</h1>\nThe request entity exceeds the maximum allowed.\n</body></html>\n",
+
+	[HTTP_ERR_421] =
+	"HTTP/1.1 421 Misdirected Request\r\n"
+	"Content-length: 104\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>421 Misdirected Request</h1>\nRequest sent to a non-authoritative server.\n</body></html>\n",
+
+	[HTTP_ERR_422] =
+	"HTTP/1.1 422 Unprocessable Content\r\n"
+	"Content-length: 116\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>422 Unprocessable Content</h1>\nThe server cannot process the contained instructions.\n</body></html>\n",
+
+	[HTTP_ERR_425] =
+	"HTTP/1.1 425 Too Early\r\n"
+	"Content-length: 80\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>425 Too Early</h1>\nYour browser sent early data.\n</body></html>\n",
+
+	[HTTP_ERR_429] =
+	"HTTP/1.1 429 Too Many Requests\r\n"
+	"Content-length: 117\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>429 Too Many Requests</h1>\nYou have sent too many requests in a given amount of time.\n</body></html>\n",
+
+	[HTTP_ERR_500] =
+	"HTTP/1.1 500 Internal Server Error\r\n"
+	"Content-length: 97\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>500 Internal Server Error</h1>\nAn internal server error occurred.\n</body></html>\n",
+
+	[HTTP_ERR_501] =
+	"HTTP/1.1 501 Not Implemented\r\n"
+	"Content-length: 136\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>501 Not Implemented</h1>\n.The server does not support the functionality required to fulfill the request.\n</body></html>\n",
+
+	[HTTP_ERR_502] =
+	"HTTP/1.1 502 Bad Gateway\r\n"
+	"Content-length: 107\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>502 Bad Gateway</h1>\nThe server returned an invalid or incomplete response.\n</body></html>\n",
+
+	[HTTP_ERR_503] =
+	"HTTP/1.1 503 Service Unavailable\r\n"
+	"Content-length: 107\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>503 Service Unavailable</h1>\nNo server is available to handle this request.\n</body></html>\n",
+
+	[HTTP_ERR_504] =
+	"HTTP/1.1 504 Gateway Time-out\r\n"
+	"Content-length: 92\r\n"
+	"Cache-Control: no-cache\r\n"
+	"Content-Type: text/html\r\n"
+	"\r\n"
+	"<html><body><h1>504 Gateway Time-out</h1>\nThe server didn't respond in time.\n</body></html>\n",
+};
+
+const struct ist http_known_methods[HTTP_METH_OTHER] = {
+	[HTTP_METH_OPTIONS] = IST("OPTIONS"),
+	[HTTP_METH_GET]     = IST("GET"),
+	[HTTP_METH_HEAD]    = IST("HEAD"),
+	[HTTP_METH_POST]    = IST("POST"),
+	[HTTP_METH_PUT]     = IST("PUT"),
+	[HTTP_METH_DELETE]  = IST("DELETE"),
+	[HTTP_METH_TRACE]   = IST("TRACE"),
+	[HTTP_METH_CONNECT] = IST("CONNECT"),
+};
+
+/*
+ * returns a known method among HTTP_METH_* or HTTP_METH_OTHER for all unknown
+ * ones.
+ */
+enum http_meth_t find_http_meth(const char *str, const int len)
+{
+	const struct ist m = ist2(str, len);
+
+	if      (isteq(m, ist("GET")))     return HTTP_METH_GET;
+	else if (isteq(m, ist("HEAD")))    return HTTP_METH_HEAD;
+	else if (isteq(m, ist("POST")))    return HTTP_METH_POST;
+	else if (isteq(m, ist("CONNECT"))) return HTTP_METH_CONNECT;
+	else if (isteq(m, ist("PUT")))     return HTTP_METH_PUT;
+	else if (isteq(m, ist("OPTIONS"))) return HTTP_METH_OPTIONS;
+	else if (isteq(m, ist("DELETE")))  return HTTP_METH_DELETE;
+	else if (isteq(m, ist("TRACE")))   return HTTP_METH_TRACE;
+	else                               return HTTP_METH_OTHER;
+}
+
+/* This function returns HTTP_ERR_<num> (enum) matching http status code.
+ * Returned value should match codes from http_err_codes.
+ */
+int http_get_status_idx(unsigned int status)
+{
+	switch (status) {
+	case 200: return HTTP_ERR_200;
+	case 400: return HTTP_ERR_400;
+	case 401: return HTTP_ERR_401;
+	case 403: return HTTP_ERR_403;
+	case 404: return HTTP_ERR_404;
+	case 405: return HTTP_ERR_405;
+	case 407: return HTTP_ERR_407;
+	case 408: return HTTP_ERR_408;
+	case 410: return HTTP_ERR_410;
+	case 413: return HTTP_ERR_413;
+	case 421: return HTTP_ERR_421;
+	case 422: return HTTP_ERR_422;
+	case 425: return HTTP_ERR_425;
+	case 429: return HTTP_ERR_429;
+	case 500: return HTTP_ERR_500;
+	case 501: return HTTP_ERR_501;
+	case 502: return HTTP_ERR_502;
+	case 503: return HTTP_ERR_503;
+	case 504: return HTTP_ERR_504;
+	default: return HTTP_ERR_500;
+	}
+}
+
+/* This function returns a reason associated with the HTTP status.
+ * This function never fails, a message is always returned.
+ */
+const char *http_get_reason(unsigned int status)
+{
+	switch (status) {
+	case 100: return "Continue";
+	case 101: return "Switching Protocols";
+	case 102: return "Processing";
+	case 200: return "OK";
+	case 201: return "Created";
+	case 202: return "Accepted";
+	case 203: return "Non-Authoritative Information";
+	case 204: return "No Content";
+	case 205: return "Reset Content";
+	case 206: return "Partial Content";
+	case 207: return "Multi-Status";
+	case 210: return "Content Different";
+	case 226: return "IM Used";
+	case 300: return "Multiple Choices";
+	case 301: return "Moved Permanently";
+	case 302: return "Found";
+	case 303: return "See Other";
+	case 304: return "Not Modified";
+	case 305: return "Use Proxy";
+	case 307: return "Temporary Redirect";
+	case 308: return "Permanent Redirect";
+	case 310: return "Too many Redirects";
+	case 400: return "Bad Request";
+	case 401: return "Unauthorized";
+	case 402: return "Payment Required";
+	case 403: return "Forbidden";
+	case 404: return "Not Found";
+	case 405: return "Method Not Allowed";
+	case 406: return "Not Acceptable";
+	case 407: return "Proxy Authentication Required";
+	case 408: return "Request Time-out";
+	case 409: return "Conflict";
+	case 410: return "Gone";
+	case 411: return "Length Required";
+	case 412: return "Precondition Failed";
+	case 413: return "Request Entity Too Large";
+	case 414: return "Request-URI Too Long";
+	case 415: return "Unsupported Media Type";
+	case 416: return "Requested range unsatisfiable";
+	case 417: return "Expectation failed";
+	case 418: return "I'm a teapot";
+	case 421: return "Misdirected Request";
+	case 422: return "Unprocessable Content";
+	case 423: return "Locked";
+	case 424: return "Method failure";
+	case 425: return "Too Early";
+	case 426: return "Upgrade Required";
+	case 428: return "Precondition Required";
+	case 429: return "Too Many Requests";
+	case 431: return "Request Header Fields Too Large";
+	case 449: return "Retry With";
+	case 450: return "Blocked by Windows Parental Controls";
+	case 451: return "Unavailable For Legal Reasons";
+	case 456: return "Unrecoverable Error";
+	case 499: return "client has closed connection";
+	case 500: return "Internal Server Error";
+	case 501: return "Not Implemented";
+	case 502: return "Bad Gateway or Proxy Error";
+	case 503: return "Service Unavailable";
+	case 504: return "Gateway Time-out";
+	case 505: return "HTTP Version not supported";
+	case 506: return "Variant also negotiate";
+	case 507: return "Insufficient storage";
+	case 508: return "Loop detected";
+	case 509: return "Bandwidth Limit Exceeded";
+	case 510: return "Not extended";
+	case 511: return "Network authentication required";
+	case 520: return "Web server is returning an unknown error";
+	default:
+		switch (status) {
+		case 100 ... 199: return "Informational";
+		case 200 ... 299: return "Success";
+		case 300 ... 399: return "Redirection";
+		case 400 ... 499: return "Client Error";
+		case 500 ... 599: return "Server Error";
+		default:          return "Other";
+		}
+	}
+}
+
+/* Returns the ist string corresponding to port part (without ':') in the host
+ * <host>, IST_NULL if no ':' is found or an empty IST if there is no digit. In
+ * the last case, the result is the original ist trimmed to 0. So be sure to test
+ * the result length before doing any pointer arithmetic.
+*/
+struct ist http_get_host_port(const struct ist host)
+{
+	char *start, *end, *ptr;
+
+	start = istptr(host);
+	end = istend(host);
+	for (ptr = end; ptr > start && isdigit((unsigned char)*--ptr););
+
+	/* no port found */
+	if (likely(*ptr != ':'))
+		return IST_NULL;
+	if (ptr+1 == end)
+		return isttrim(host, 0);
+
+	return istnext(ist2(ptr, end - ptr));
+}
+
+
+/* Return non-zero if the port <port> is a default port. If the scheme <schm> is
+ * set, it is used to detect default ports (HTTP => 80 and HTTPS => 443)
+ * port. Otherwise, both are considered as default ports.
+ */
+int http_is_default_port(const struct ist schm, const struct ist port)
+{
+	if (!istlen(port))
+		return 1;
+
+	if (!isttest(schm))
+		return (isteq(port, ist("443")) || isteq(port, ist("80")));
+	else
+		return (isteq(port, ist("443")) && isteqi(schm, ist("https://"))) ||
+			(isteq(port, ist("80")) && isteqi(schm, ist("http://")));
+}
+
+/* Returns non-zero if the scheme <schm> is syntactically correct according to
+ * RFC3986#3.1, otherwise zero. It expects only the scheme and nothing else
+ * (particularly not the following "://").
+ *     Scheme = alpha *(alpha|digit|'+'|'-'|'.')
+ */
+int http_validate_scheme(const struct ist schm)
+{
+	size_t i;
+
+	for (i = 0; i < schm.len; i++) {
+		if (likely((schm.ptr[i] >= 'a' && schm.ptr[i] <= 'z') ||
+			   (schm.ptr[i] >= 'A' && schm.ptr[i] <= 'Z')))
+			continue;
+		if (unlikely(!i)) // first char must be alpha
+			return 0;
+		if ((schm.ptr[i] >= '0' && schm.ptr[i] <= '9') ||
+		    schm.ptr[i] == '+' || schm.ptr[i] == '-' || schm.ptr[i] == '.')
+			continue;
+		return 0;
+	}
+	return !!i;
+}
+
+/* Parse the uri and looks for the scheme. If not found, an empty ist is
+ * returned. Otherwise, the ist pointing to the scheme is returned.
+ *
+ * <parser> must have been initialized via http_uri_parser_init. See the
+ * related http_uri_parser documentation for the specific API usage.
+ */
+struct ist http_parse_scheme(struct http_uri_parser *parser)
+{
+	const char *ptr, *start, *end;
+
+	if (parser->state >= URI_PARSER_STATE_SCHEME_DONE)
+		goto not_found;
+
+	if (parser->format != URI_PARSER_FORMAT_ABSURI_OR_AUTHORITY)
+		goto not_found;
+
+	ptr = start = istptr(parser->uri);
+	end = istend(parser->uri);
+
+	if (isalpha((unsigned char)*ptr)) {
+		/* this is a scheme as described by RFC3986, par. 3.1, or only
+		 * an authority (in case of a CONNECT method).
+		 */
+		ptr++;
+		/* retrieve the scheme up to the suffix '://'. If the suffix is
+		 * not found, this means there is no scheme and it is an
+		 * authority-only uri.
+		 */
+		while (ptr < end &&
+		       (isalnum((unsigned char)*ptr) || *ptr == '+' || *ptr == '-' || *ptr == '.'))
+			ptr++;
+		if (ptr == end || *ptr++ != ':')
+			goto not_found;
+		if (ptr == end || *ptr++ != '/')
+			goto not_found;
+		if (ptr == end || *ptr++ != '/')
+			goto not_found;
+	}
+	else {
+		goto not_found;
+	}
+
+	parser->uri = ist2(ptr, end - ptr);
+	parser->state = URI_PARSER_STATE_SCHEME_DONE;
+	return ist2(start, ptr - start);
+
+ not_found:
+	parser->state = URI_PARSER_STATE_SCHEME_DONE;
+	return IST_NULL;
+}
+
+/* Parse the uri and looks for the authority, between the scheme and the
+ * path. if no_userinfo is not zero, the part before the '@' (including it) is
+ * skipped. If not found, an empty ist is returned. Otherwise, the ist pointing
+ * on the authority is returned.
+ *
+ * <parser> must have been initialized via http_uri_parser_init. See the
+ * related http_uri_parser documentation for the specific API usage.
+ */
+struct ist http_parse_authority(struct http_uri_parser *parser, int no_userinfo)
+{
+	const char *ptr, *start, *end;
+
+	if (parser->state >= URI_PARSER_STATE_AUTHORITY_DONE)
+		goto not_found;
+
+	if (parser->format != URI_PARSER_FORMAT_ABSURI_OR_AUTHORITY)
+		goto not_found;
+
+	if (parser->state < URI_PARSER_STATE_SCHEME_DONE)
+		http_parse_scheme(parser);
+
+	ptr = start = istptr(parser->uri);
+	end = istend(parser->uri);
+
+	while (ptr < end && *ptr != '/') {
+		if (*ptr++ == '@' && no_userinfo)
+			start = ptr;
+	}
+
+	/* OK, ptr point on the '/' or the end */
+
+  authority:
+	parser->uri = ist2(ptr, end - ptr);
+	parser->state = URI_PARSER_STATE_AUTHORITY_DONE;
+	return ist2(start, ptr - start);
+
+  not_found:
+	parser->state = URI_PARSER_STATE_AUTHORITY_DONE;
+	return IST_NULL;
+}
+
+/* Parse the URI from the given transaction (which is assumed to be in request
+ * phase) and look for the "/" beginning the PATH. If not found, ist2(0,0) is
+ * returned. Otherwise the pointer and length are returned.
+ *
+ * <parser> must have been initialized via http_uri_parser_init. See the
+ * related http_uri_parser documentation for the specific API usage.
+ */
+struct ist http_parse_path(struct http_uri_parser *parser)
+{
+	const char *ptr, *end;
+
+	if (parser->state >= URI_PARSER_STATE_PATH_DONE)
+		goto not_found;
+
+	if (parser->format == URI_PARSER_FORMAT_EMPTY ||
+	    parser->format == URI_PARSER_FORMAT_ASTERISK) {
+		goto not_found;
+	}
+
+	ptr = istptr(parser->uri);
+	end = istend(parser->uri);
+
+	/* If the uri is in absolute-path format, first skip the scheme and
+	 * authority parts. No scheme will be found if the uri is in authority
+	 * format, which indicates that the path won't be present.
+	 */
+	if (parser->format == URI_PARSER_FORMAT_ABSURI_OR_AUTHORITY) {
+		if (parser->state < URI_PARSER_STATE_SCHEME_DONE) {
+			/* If no scheme found, uri is in authority format. No
+			 * path is present.
+			 */
+			if (!isttest(http_parse_scheme(parser)))
+				goto not_found;
+		}
+
+		if (parser->state < URI_PARSER_STATE_AUTHORITY_DONE)
+			http_parse_authority(parser, 1);
+
+		ptr = istptr(parser->uri);
+
+		if (ptr == end)
+			goto not_found;
+	}
+
+	parser->state = URI_PARSER_STATE_PATH_DONE;
+	return ist2(ptr, end - ptr);
+
+ not_found:
+	parser->state = URI_PARSER_STATE_PATH_DONE;
+	return IST_NULL;
+}
+
+/* Parse <value> Content-Length header field of an HTTP request. The function
+ * checks all possible occurrences of a comma-delimited value, and verifies if
+ * any of them doesn't match a previous value. <value> is sanitized on return
+ * to contain a single value if several identical values were found.
+ *
+ * <body_len> must be a valid pointer and is used to return the parsed length
+ * unless values differ. Also if <not_first> is true, <body_len> is assumed to
+ * point to previously parsed value and which must be equal to the new length.
+ * This is useful if an HTTP message contains several Content-Length headers.
+ *
+ * Returns <0 if a value differs, 0 if the whole header can be dropped (i.e.
+ * already known), or >0 if the value can be indexed (first one). In the last
+ * case, the value might be adjusted and the caller must only add the updated
+ * value.
+ */
+int http_parse_cont_len_header(struct ist *value, unsigned long long *body_len,
+                               int not_first)
+{
+	char *e, *n;
+	unsigned long long cl;
+	struct ist word;
+	int check_prev = not_first;
+
+	word.ptr = value->ptr;
+	e = value->ptr + value->len;
+
+	while (1) {
+		if (word.ptr >= e) {
+			/* empty header or empty value */
+			goto fail;
+		}
+
+		/* skip leading delimiter and blanks */
+		if (unlikely(HTTP_IS_LWS(*word.ptr))) {
+			word.ptr++;
+			continue;
+		}
+
+		/* digits only now */
+		for (cl = 0, n = word.ptr; n < e; n++) {
+			unsigned int c = *n - '0';
+			if (unlikely(c > 9)) {
+				/* non-digit */
+				if (unlikely(n == word.ptr)) // spaces only
+					goto fail;
+				break;
+			}
+
+			if (unlikely(!cl && n > word.ptr)) {
+				/* There was a leading zero before this digit,
+				 * let's trim it.
+				 */
+				word.ptr = n;
+			}
+
+			if (unlikely(cl > ULLONG_MAX / 10ULL))
+				goto fail; /* multiply overflow */
+			cl = cl * 10ULL;
+			if (unlikely(cl + c < cl))
+				goto fail; /* addition overflow */
+			cl = cl + c;
+		}
+
+		/* keep a copy of the exact cleaned value */
+		word.len = n - word.ptr;
+
+		/* skip trailing LWS till next comma or EOL */
+		for (; n < e; n++) {
+			if (!HTTP_IS_LWS(*n)) {
+				if (unlikely(*n != ','))
+					goto fail;
+				break;
+			}
+		}
+
+		/* if duplicate, must be equal */
+		if (check_prev && cl != *body_len)
+			goto fail;
+
+		/* OK, store this result as the one to be indexed */
+		*body_len = cl;
+		*value = word;
+
+		/* Now either n==e and we're done, or n points to the comma,
+		 * and we skip it and continue.
+		 */
+		if (n++ == e)
+			break;
+
+		word.ptr = n;
+		check_prev = 1;
+	}
+
+	/* here we've reached the end with a single value or a series of
+	 * identical values, all matching previous series if any. The last
+	 * parsed value was sent back into <value>. We just have to decide
+	 * if this occurrence has to be indexed (it's the first one) or
+	 * silently skipped (it's not the first one)
+	 */
+	return !not_first;
+ fail:
+	return -1;
+}
+
+/*
+ * Checks if <hdr> is exactly <name> for <len> chars, and ends with a colon.
+ * If so, returns the position of the first non-space character relative to
+ * <hdr>, or <end>-<hdr> if not found before. If no value is found, it tries
+ * to return a pointer to the place after the first space. Returns 0 if the
+ * header name does not match. Checks are case-insensitive.
+ */
+int http_header_match2(const char *hdr, const char *end,
+		       const char *name, int len)
+{
+	const char *val;
+
+	if (hdr + len >= end)
+		return 0;
+	if (hdr[len] != ':')
+		return 0;
+	if (strncasecmp(hdr, name, len) != 0)
+		return 0;
+	val = hdr + len + 1;
+	while (val < end && HTTP_IS_SPHT(*val))
+		val++;
+	if ((val >= end) && (len + 2 <= end - hdr))
+		return len + 2; /* we may replace starting from second space */
+	return val - hdr;
+}
+
+/* Find the end of the header value contained between <s> and <e>. See RFC7230,
+ * par 3.2 for more information. Note that it requires a valid header to return
+ * a valid result. This works for headers defined as comma-separated lists.
+ */
+char *http_find_hdr_value_end(char *s, const char *e)
+{
+	int quoted, qdpair;
+
+	quoted = qdpair = 0;
+
+#ifdef HA_UNALIGNED_LE
+	/* speedup: skip everything not a comma nor a double quote */
+	for (; s <= e - sizeof(int); s += sizeof(int)) {
+		unsigned int c = *(int *)s; // comma
+		unsigned int q = c;         // quote
+
+		c ^= 0x2c2c2c2c; // contains one zero on a comma
+		q ^= 0x22222222; // contains one zero on a quote
+
+		c = (c - 0x01010101) & ~c; // contains 0x80 below a comma
+		q = (q - 0x01010101) & ~q; // contains 0x80 below a quote
+
+		if ((c | q) & 0x80808080)
+			break; // found a comma or a quote
+	}
+#endif
+	for (; s < e; s++) {
+		if (qdpair)                    qdpair = 0;
+		else if (quoted) {
+			if (*s == '\\')        qdpair = 1;
+			else if (*s == '"')    quoted = 0;
+		}
+		else if (*s == '"')            quoted = 1;
+		else if (*s == ',')            return s;
+	}
+	return s;
+}
+
+/* Find the end of a cookie value contained between <s> and <e>. It works the
+ * same way as with headers above except that the semi-colon also ends a token.
+ * See RFC2965 for more information. Note that it requires a valid header to
+ * return a valid result.
+ */
+char *http_find_cookie_value_end(char *s, const char *e)
+{
+	int quoted, qdpair;
+
+	quoted = qdpair = 0;
+	for (; s < e; s++) {
+		if (qdpair)                    qdpair = 0;
+		else if (quoted) {
+			if (*s == '\\')        qdpair = 1;
+			else if (*s == '"')    quoted = 0;
+		}
+		else if (*s == '"')            quoted = 1;
+		else if (*s == ',' || *s == ';') return s;
+	}
+	return s;
+}
+
+/* Try to find the next occurrence of a cookie name in a cookie header value.
+ * To match on any cookie name, <cookie_name_l> must be set to 0.
+ * The lookup begins at <hdr>. The pointer and size of the next occurrence of
+ * the cookie value is returned into *value and *value_l, and the function
+ * returns a pointer to the next pointer to search from if the value was found.
+ * Otherwise if the cookie was not found, NULL is returned and neither value
+ * nor value_l are touched. The input <hdr> string should first point to the
+ * header's value, and the <hdr_end> pointer must point to the first character
+ * not part of the value. <list> must be non-zero if value may represent a list
+ * of values (cookie headers). This makes it faster to abort parsing when no
+ * list is expected.
+ */
+char *http_extract_cookie_value(char *hdr, const char *hdr_end,
+                                char *cookie_name, size_t cookie_name_l,
+                                int list, char **value, size_t *value_l)
+{
+	char *equal, *att_end, *att_beg, *val_beg, *val_end;
+	char *next;
+
+	/* we search at least a cookie name followed by an equal, and more
+	 * generally something like this :
+	 * Cookie:    NAME1  =  VALUE 1  ; NAME2 = VALUE2 ; NAME3 = VALUE3\r\n
+	 */
+	for (att_beg = hdr; att_beg + cookie_name_l + 1 < hdr_end; att_beg = next + 1) {
+		/* Iterate through all cookies on this line */
+
+		while (att_beg < hdr_end && HTTP_IS_SPHT(*att_beg))
+			att_beg++;
+
+		/* find att_end : this is the first character after the last non
+		 * space before the equal. It may be equal to hdr_end.
+		 */
+		equal = att_end = att_beg;
+
+		while (equal < hdr_end) {
+			if (*equal == '=' || *equal == ';' || (list && *equal == ','))
+				break;
+			if (HTTP_IS_SPHT(*equal++))
+				continue;
+			att_end = equal;
+		}
+
+		/* here, <equal> points to '=', a delimiter or the end. <att_end>
+		 * is between <att_beg> and <equal>, both may be identical.
+		 */
+
+		/* look for end of cookie if there is an equal sign */
+		if (equal < hdr_end && *equal == '=') {
+			/* look for the beginning of the value */
+			val_beg = equal + 1;
+			while (val_beg < hdr_end && HTTP_IS_SPHT(*val_beg))
+				val_beg++;
+
+			/* find the end of the value, respecting quotes */
+			next = http_find_cookie_value_end(val_beg, hdr_end);
+
+			/* make val_end point to the first white space or delimiter after the value */
+			val_end = next;
+			while (val_end > val_beg && HTTP_IS_SPHT(*(val_end - 1)))
+				val_end--;
+		} else {
+			val_beg = val_end = next = equal;
+		}
+
+		/* We have nothing to do with attributes beginning with '$'. However,
+		 * they will automatically be removed if a header before them is removed,
+		 * since they're supposed to be linked together.
+		 */
+		if (*att_beg == '$')
+			continue;
+
+		/* Ignore cookies with no equal sign */
+		if (equal == next)
+			continue;
+
+		/* Now we have the cookie name between att_beg and att_end, and
+		 * its value between val_beg and val_end.
+		 */
+
+		if (cookie_name_l == 0 || (att_end - att_beg == cookie_name_l &&
+		    memcmp(att_beg, cookie_name, cookie_name_l) == 0)) {
+			/* let's return this value and indicate where to go on from */
+			*value = val_beg;
+			*value_l = val_end - val_beg;
+			return next + 1;
+		}
+
+		/* Set-Cookie headers only have the name in the first attr=value part */
+		if (!list)
+			break;
+	}
+
+	return NULL;
+}
+
+/* Try to find the next cookie name in a cookie header given a pointer
+ * <hdr_beg> to the starting position, a pointer <hdr_end> to the ending
+ * position to search in the cookie and a boolean <is_req> of type int that
+ * indicates if the stream direction is for request or response.
+ * The lookup begins at <hdr_beg>, which is assumed to be in
+ * Cookie / Set-Cookie header, and the function returns a pointer to the next
+ * position to search from if a valid cookie k-v pair is found for Cookie
+ * request header (<is_req> is non-zero) and <hdr_end> for Set-Cookie response
+ * header (<is_req> is zero). When the next cookie name is found, <ptr> will
+ * be pointing to the start of the cookie name, and <len> will be the length
+ * of the cookie name.
+ * Otherwise if there is no valid cookie k-v pair, NULL is returned.
+ * The <hdr_end> pointer must point to the first character
+ * not part of the Cookie / Set-Cookie header.
+ */
+char *http_extract_next_cookie_name(char *hdr_beg, char *hdr_end, int is_req,
+                                    char **ptr, size_t *len)
+{
+	char *equal, *att_end, *att_beg, *val_beg;
+	char *next;
+
+	/* We search a valid cookie name between hdr_beg and hdr_end,
+	 * followed by an equal. For example for the following cookie:
+	 * Cookie:    NAME1  =  VALUE 1  ; NAME2 = VALUE2 ; NAME3 = VALUE3\r\n
+	 * We want to find NAME1, NAME2, or NAME3 depending on where we start our search
+	 * according to <hdr_beg>
+	 */
+	for (att_beg = hdr_beg; att_beg + 1 < hdr_end; att_beg = next + 1) {
+		while (att_beg < hdr_end && HTTP_IS_SPHT(*att_beg))
+			att_beg++;
+
+		/* find <att_end> : this is the first character after the last non
+		 * space before the equal. It may be equal to <hdr_end>.
+		 */
+		equal = att_end = att_beg;
+
+		while (equal < hdr_end) {
+			if (*equal == '=' || *equal == ';')
+				break;
+			if (HTTP_IS_SPHT(*equal++))
+				continue;
+			att_end = equal;
+		}
+
+		/* Here, <equal> points to '=', a delimiter or the end. <att_end>
+		 * is between <att_beg> and <equal>, both may be identical.
+		 */
+
+		/* Look for end of cookie if there is an equal sign */
+		if (equal < hdr_end && *equal == '=') {
+			/* Look for the beginning of the value */
+			val_beg = equal + 1;
+			while (val_beg < hdr_end && HTTP_IS_SPHT(*val_beg))
+				val_beg++;
+
+			/* Find the end of the value, respecting quotes */
+			next = http_find_cookie_value_end(val_beg, hdr_end);
+		} else {
+			next = equal;
+		}
+
+		/* We have nothing to do with attributes beginning with '$'. However,
+		 * they will automatically be removed if a header before them is removed,
+		 * since they're supposed to be linked together.
+		 */
+		if (*att_beg == '$')
+			continue;
+
+		/* Ignore cookies with no equal sign */
+		if (equal == next)
+			continue;
+
+		/* Now we have the cookie name between <att_beg> and <att_end>, and
+		 * <next> points to the end of cookie value
+		 */
+		*ptr = att_beg;
+		*len = att_end - att_beg;
+
+		/* Return next position for Cookie request header and <hdr_end> for
+		 * Set-Cookie response header as each Set-Cookie header is assumed to
+		 * contain only 1 cookie
+		 */
+		if (is_req)
+			return next + 1;
+		return hdr_end;
+	}
+
+	return NULL;
+}
+
+/* Parses a qvalue and returns it multiplied by 1000, from 0 to 1000. If the
+ * value is larger than 1000, it is bound to 1000. The parser consumes up to
+ * 1 digit, one dot and 3 digits and stops on the first invalid character.
+ * Unparsable qvalues return 1000 as "q=1.000".
+ */
+int http_parse_qvalue(const char *qvalue, const char **end)
+{
+	int q = 1000;
+
+	if (!isdigit((unsigned char)*qvalue))
+		goto out;
+	q = (*qvalue++ - '0') * 1000;
+
+	if (*qvalue++ != '.')
+		goto out;
+
+	if (!isdigit((unsigned char)*qvalue))
+		goto out;
+	q += (*qvalue++ - '0') * 100;
+
+	if (!isdigit((unsigned char)*qvalue))
+		goto out;
+	q += (*qvalue++ - '0') * 10;
+
+	if (!isdigit((unsigned char)*qvalue))
+		goto out;
+	q += (*qvalue++ - '0') * 1;
+ out:
+	if (q > 1000)
+		q = 1000;
+	if (end)
+		*end = qvalue;
+	return q;
+}
+
+/*
+ * Given a url parameter, find the starting position of the first occurrence,
+ * or NULL if the parameter is not found.
+ *
+ * Example: if query_string is "yo=mama;ye=daddy" and url_param_name is "ye",
+ * the function will return query_string+8.
+ *
+ * Warning: this function returns a pointer that can point to the first chunk
+ * or the second chunk. The caller must be check the position before using the
+ * result.
+ */
+const char *http_find_url_param_pos(const char **chunks,
+                                    const char* url_param_name, size_t url_param_name_l,
+                                    char delim, char insensitive)
+{
+	const char *pos, *last, *equal;
+	const char **bufs = chunks;
+	int l1, l2;
+
+
+	pos  = bufs[0];
+	last = bufs[1];
+	while (pos < last) {
+		/* Check the equal. */
+		equal = pos + url_param_name_l;
+		if (fix_pointer_if_wrap(chunks, &equal)) {
+			if (equal >= chunks[3])
+				return NULL;
+		} else {
+			if (equal >= chunks[1])
+				return NULL;
+		}
+		if (*equal == '=') {
+			if (pos + url_param_name_l > last) {
+				/* process wrap case, we detect a wrap. In this case, the
+				 * comparison is performed in two parts.
+				 */
+
+				/* This is the end, we don't have any other chunk. */
+				if (bufs != chunks || !bufs[2])
+					return NULL;
+
+				/* Compute the length of each part of the comparison. */
+				l1 = last - pos;
+				l2 = url_param_name_l - l1;
+
+				/* The second buffer is too short to contain the compared string. */
+				if (bufs[2] + l2 > bufs[3])
+					return NULL;
+
+				if (insensitive) {
+					if (strncasecmp(pos,     url_param_name,    l1) == 0 &&
+						strncasecmp(bufs[2], url_param_name+l1, l2) == 0)
+						return pos;
+				}
+				else {
+					if (memcmp(pos,     url_param_name,    l1) == 0 &&
+						memcmp(bufs[2], url_param_name+l1, l2) == 0)
+						return pos;
+				}
+
+				/* Perform wrapping and jump the string who fail the comparison. */
+				bufs += 2;
+				pos = bufs[0] + l2;
+				last = bufs[1];
+
+			} else {
+					/* process a simple comparison.*/
+				if (insensitive) {
+					if (strncasecmp(pos, url_param_name, url_param_name_l) == 0)
+						return pos;
+				} else {
+					if (memcmp(pos, url_param_name, url_param_name_l) == 0)
+						return pos;
+				}
+				pos += url_param_name_l + 1;
+				if (fix_pointer_if_wrap(chunks, &pos))
+					last = bufs[2];
+			}
+		}
+
+		while (1) {
+			/* Look for the next delimiter. */
+			while (pos < last && !http_is_param_delimiter(*pos, delim))
+				pos++;
+			if (pos < last)
+				break;
+			/* process buffer wrapping. */
+			if (bufs != chunks || !bufs[2])
+				return NULL;
+			bufs += 2;
+			pos = bufs[0];
+			last = bufs[1];
+		}
+		pos++;
+	}
+	return NULL;
+}
+
+/*
+ * Given a url parameter name and a query string, find the next value.
+ * An empty url_param_name matches the first available parameter.
+ * If the parameter is found, 1 is returned and *vstart / *vend are updated to
+ * respectively provide a pointer to the value and its end.
+ * Otherwise, 0 is returned and vstart/vend are not modified.
+ */
+int http_find_next_url_param(const char **chunks,
+                             const char* url_param_name, size_t url_param_name_l,
+                             const char **vstart, const char **vend, char delim, char insensitive)
+{
+	const char *arg_start, *qs_end;
+	const char *value_start, *value_end;
+
+	arg_start = chunks[0];
+	qs_end = chunks[1];
+	if (url_param_name_l) {
+		/* Looks for an argument name. */
+		arg_start = http_find_url_param_pos(chunks,
+		                                    url_param_name, url_param_name_l,
+		                                    delim, insensitive);
+		/* Check for wrapping. */
+		if (arg_start >= qs_end)
+			qs_end = chunks[3];
+	}
+	if (!arg_start)
+		return 0;
+
+	if (!url_param_name_l) {
+		while (1) {
+			/* looks for the first argument. */
+			value_start = memchr(arg_start, '=', qs_end - arg_start);
+			if (!value_start) {
+				/* Check for wrapping. */
+				if (arg_start >= chunks[0] &&
+				    arg_start < chunks[1] &&
+				    chunks[2]) {
+					arg_start = chunks[2];
+					qs_end = chunks[3];
+					continue;
+				}
+				return 0;
+			}
+			break;
+		}
+		value_start++;
+	}
+	else {
+		/* Jump the argument length. */
+		value_start = arg_start + url_param_name_l + 1;
+
+		/* Check for pointer wrapping. */
+		if (fix_pointer_if_wrap(chunks, &value_start)) {
+			/* Update the end pointer. */
+			qs_end = chunks[3];
+
+			/* Check for overflow. */
+			if (value_start >= qs_end)
+				return 0;
+		}
+	}
+
+	value_end = value_start;
+
+	while (1) {
+		while ((value_end < qs_end) && !http_is_param_delimiter(*value_end, delim))
+			value_end++;
+		if (value_end < qs_end)
+			break;
+		/* process buffer wrapping. */
+		if (value_end >= chunks[0] &&
+		    value_end < chunks[1] &&
+		    chunks[2]) {
+			value_end = chunks[2];
+			qs_end = chunks[3];
+			continue;
+		}
+		break;
+	}
+
+	*vstart = value_start;
+	*vend = value_end;
+	return 1;
+}
+
+/* Parses a single header line (without the CRLF) and splits it into its name
+ * and its value. The parsing is pretty naive and just skip spaces.
+ */
+int http_parse_header(const struct ist hdr, struct ist *name, struct ist *value)
+{
+        char *p   = hdr.ptr;
+        char *end = p + hdr.len;
+
+        name->len = value->len = 0;
+
+        /* Skip leading spaces */
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+
+        /* Set the header name */
+        name->ptr = p;
+        for (; p < end && HTTP_IS_TOKEN(*p); p++);
+        name->len = p - name->ptr;
+
+        /* Skip the ':' and spaces before and after it */
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+        if (p < end && *p == ':') p++;
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+
+        /* Set the header value */
+        value->ptr = p;
+        value->len = end - p;
+
+        return 1;
+}
+
+/* Parses a single start line (without the CRLF) and splits it into 3 parts. The
+ * parsing is pretty naive and just skip spaces.
+ */
+int http_parse_stline(const struct ist line, struct ist *p1, struct ist *p2, struct ist *p3)
+{
+        char *p   = line.ptr;
+        char *end = p + line.len;
+
+        p1->len = p2->len = p3->len = 0;
+
+        /* Skip leading spaces */
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+
+        /* Set the first part */
+        p1->ptr = p;
+        for (; p < end && HTTP_IS_TOKEN(*p); p++);
+        p1->len = p - p1->ptr;
+
+        /* Skip spaces between p1 and p2 */
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+
+        /* Set the second part */
+        p2->ptr = p;
+        for (; p < end && !HTTP_IS_SPHT(*p); p++);
+        p2->len = p - p2->ptr;
+
+        /* Skip spaces between p2 and p3 */
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+
+        /* The remaining is the third value */
+        p3->ptr = p;
+        p3->len = end - p;
+
+        return 1;
+}
+
+/* Parses value of a Status header with the following format: "Status: Code[
+ * Reason]".  The parsing is pretty naive and just skip spaces. It return the
+ * numeric value of the status code.
+ */
+int http_parse_status_val(const struct ist value, struct ist *status, struct ist *reason)
+{
+	char *p   = value.ptr;
+        char *end = p + value.len;
+	uint16_t code;
+
+	status->len = reason->len = 0;
+
+	/* Skip leading spaces */
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+
+        /* Set the status part */
+        status->ptr = p;
+        for (; p < end && HTTP_IS_TOKEN(*p); p++);
+        status->len = p - status->ptr;
+
+	/* Skip spaces between status and reason */
+        for (; p < end && HTTP_IS_SPHT(*p); p++);
+
+	/* the remaining is the reason */
+        reason->ptr = p;
+        reason->len = end - p;
+
+	code = strl2ui(status->ptr, status->len);
+	return code;
+}
+
+
+/* Returns non-zero if the two ETags are comparable (see RFC 7232#2.3.2).
+ * If any of them is a weak ETag, we discard the weakness prefix and perform
+ * a strict string comparison.
+ * Returns 0 otherwise.
+ */
+int http_compare_etags(struct ist etag1, struct ist etag2)
+{
+	enum http_etag_type etag_type1;
+	enum http_etag_type etag_type2;
+
+	etag_type1 = http_get_etag_type(etag1);
+	etag_type2 = http_get_etag_type(etag2);
+
+	if (etag_type1 == ETAG_INVALID || etag_type2 == ETAG_INVALID)
+		return 0;
+
+	/* Discard the 'W/' prefix an ETag is a weak one. */
+	if (etag_type1 == ETAG_WEAK)
+		etag1 = istadv(etag1, 2);
+	if (etag_type2 == ETAG_WEAK)
+		etag2 = istadv(etag2, 2);
+
+	return isteq(etag1, etag2);
+}
+
+
+/*
+ * Trim leading space or horizontal tab characters from <value> string.
+ * Returns the trimmed string.
+ */
+struct ist http_trim_leading_spht(struct ist value)
+{
+	struct ist ret = value;
+
+	while (ret.len && HTTP_IS_SPHT(ret.ptr[0])) {
+		++ret.ptr;
+		--ret.len;
+	}
+
+	return ret;
+}
+
+/*
+ * Trim trailing space or horizontal tab characters from <value> string.
+ * Returns the trimmed string.
+ */
+struct ist http_trim_trailing_spht(struct ist value)
+{
+	struct ist ret = value;
+
+	while (ret.len && HTTP_IS_SPHT(ret.ptr[-1]))
+		--ret.len;
+
+	return ret;
+}