libhttpserver/src/http_utils.cpp at remove_protected · mayhemheroes/libhttpserver

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This file is part of libhttpserver

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301

USA

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#if defined(__MINGW32__) || defined(__CYGWIN32__)

#define _WINDOWS

#undef _WIN32_WINNT

#define _WIN32_WINNT 0x600

#include <winsock2.h>

#include <ws2tcpip.h>

#else

#include <sys/socket.h>

#include <netdb.h>

#include <arpa/inet.h>

#endif

#include <sstream>

#include <iomanip>

#include <fstream>

#include <iostream>

#include <stdexcept>

#include "string_utilities.hpp"

#include "http_utils.hpp"

#pragma GCC diagnostic ignored "-Warray-bounds"

#define CHECK_BIT(var,pos) ((var) & (1<<(pos)))

#define SET_BIT(var,pos) ((var) |= 1 << (pos))

#define CLEAR_BIT(var,pos) ((var) &= ~(1<<(pos)))

using namespace std;

namespace httpserver {

namespace http {

/* See also: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html */

const int http_utils::http_continue = MHD_HTTP_CONTINUE;

const int http_utils::http_switching_protocol = MHD_HTTP_SWITCHING_PROTOCOLS;

const int http_utils::http_processing = MHD_HTTP_PROCESSING;

const int http_utils::http_ok = MHD_HTTP_OK;

const int http_utils::http_created = MHD_HTTP_CREATED;

const int http_utils::http_accepted = MHD_HTTP_ACCEPTED;

const int http_utils::http_non_authoritative_information =

MHD_HTTP_NON_AUTHORITATIVE_INFORMATION;

const int http_utils::http_no_content = MHD_HTTP_NO_CONTENT;

const int http_utils::http_reset_content = MHD_HTTP_RESET_CONTENT;

const int http_utils::http_partial_content = MHD_HTTP_PARTIAL_CONTENT;

const int http_utils::http_multi_status = MHD_HTTP_MULTI_STATUS;

const int http_utils::http_multiple_choices = MHD_HTTP_MULTIPLE_CHOICES;

const int http_utils::http_moved_permanently = MHD_HTTP_MOVED_PERMANENTLY;

const int http_utils::http_found = MHD_HTTP_FOUND;

const int http_utils::http_see_other = MHD_HTTP_SEE_OTHER;

const int http_utils::http_not_modified = MHD_HTTP_NOT_MODIFIED;

const int http_utils::http_use_proxy = MHD_HTTP_USE_PROXY;

const int http_utils::http_switch_proxy = MHD_HTTP_SWITCH_PROXY;

const int http_utils::http_temporary_redirect = MHD_HTTP_TEMPORARY_REDIRECT;

const int http_utils::http_bad_request = MHD_HTTP_BAD_REQUEST;

const int http_utils::http_unauthorized = MHD_HTTP_UNAUTHORIZED;

const int http_utils::http_payment_required = MHD_HTTP_PAYMENT_REQUIRED;

const int http_utils::http_forbidden = MHD_HTTP_FORBIDDEN;

const int http_utils::http_not_found = MHD_HTTP_NOT_FOUND;

const int http_utils::http_method_not_allowed = MHD_HTTP_METHOD_NOT_ALLOWED;

const int http_utils::http_method_not_acceptable = MHD_HTTP_NOT_ACCEPTABLE;

const int http_utils::http_proxy_authentication_required =

MHD_HTTP_PROXY_AUTHENTICATION_REQUIRED;

const int http_utils::http_request_timeout = MHD_HTTP_REQUEST_TIMEOUT;

const int http_utils::http_conflict = MHD_HTTP_CONFLICT;

const int http_utils::http_gone = MHD_HTTP_GONE;

const int http_utils::http_length_required = MHD_HTTP_LENGTH_REQUIRED;

const int http_utils::http_precondition_failed = MHD_HTTP_PRECONDITION_FAILED;

const int http_utils::http_request_entity_too_large =

MHD_HTTP_PAYLOAD_TOO_LARGE;

const int http_utils::http_request_uri_too_long = MHD_HTTP_URI_TOO_LONG;

const int http_utils::http_unsupported_media_type =

MHD_HTTP_UNSUPPORTED_MEDIA_TYPE;

const int http_utils::http_requested_range_not_satisfiable =

MHD_HTTP_RANGE_NOT_SATISFIABLE;

const int http_utils::http_expectation_failed = MHD_HTTP_EXPECTATION_FAILED;

const int http_utils::http_unprocessable_entity = MHD_HTTP_UNPROCESSABLE_ENTITY;

const int http_utils::http_locked = MHD_HTTP_LOCKED;

const int http_utils::http_failed_dependency = MHD_HTTP_FAILED_DEPENDENCY;

const int http_utils::http_unordered_collection = MHD_HTTP_UNORDERED_COLLECTION;

const int http_utils::http_upgrade_required = MHD_HTTP_UPGRADE_REQUIRED;

const int http_utils::http_retry_with = MHD_HTTP_RETRY_WITH;

const int http_utils::http_internal_server_error =

MHD_HTTP_INTERNAL_SERVER_ERROR;

const int http_utils::http_not_implemented = MHD_HTTP_NOT_IMPLEMENTED;

const int http_utils::http_bad_gateway = MHD_HTTP_BAD_GATEWAY;

const int http_utils::http_service_unavailable = MHD_HTTP_SERVICE_UNAVAILABLE;

const int http_utils::http_gateway_timeout = MHD_HTTP_GATEWAY_TIMEOUT;

const int http_utils::http_version_not_supported =

MHD_HTTP_HTTP_VERSION_NOT_SUPPORTED;

const int http_utils::http_variant_also_negotiated =

MHD_HTTP_VARIANT_ALSO_NEGOTIATES;

const int http_utils::http_insufficient_storage = MHD_HTTP_INSUFFICIENT_STORAGE;

const int http_utils::http_bandwidth_limit_exceeded =

MHD_HTTP_BANDWIDTH_LIMIT_EXCEEDED;

const int http_utils::http_not_extended = MHD_HTTP_NOT_EXTENDED;

const int http_utils::shoutcast_response = MHD_ICY_FLAG;

const std::string http_utils::http_header_accept = MHD_HTTP_HEADER_ACCEPT;

const std::string http_utils::http_header_accept_charset =

MHD_HTTP_HEADER_ACCEPT_CHARSET;

const std::string http_utils::http_header_accept_encoding =

MHD_HTTP_HEADER_ACCEPT_ENCODING;

const std::string http_utils::http_header_accept_language =

MHD_HTTP_HEADER_ACCEPT_LANGUAGE;

const std::string http_utils::http_header_accept_ranges =

MHD_HTTP_HEADER_ACCEPT_RANGES;

const std::string http_utils::http_header_age = MHD_HTTP_HEADER_AGE;

const std::string http_utils::http_header_allow = MHD_HTTP_HEADER_ALLOW;

const std::string http_utils::http_header_authorization =

MHD_HTTP_HEADER_AUTHORIZATION;

const std::string http_utils::http_header_cache_control =

MHD_HTTP_HEADER_CACHE_CONTROL;

const std::string http_utils::http_header_connection =

MHD_HTTP_HEADER_CONNECTION;

const std::string http_utils::http_header_content_encoding =

MHD_HTTP_HEADER_CONTENT_ENCODING;

const std::string http_utils::http_header_content_language =

MHD_HTTP_HEADER_CONTENT_LANGUAGE;

const std::string http_utils::http_header_content_length =

MHD_HTTP_HEADER_CONTENT_LENGTH;

const std::string http_utils::http_header_content_location =

MHD_HTTP_HEADER_CONTENT_LOCATION;

const std::string http_utils::http_header_content_md5 =

MHD_HTTP_HEADER_CONTENT_MD5;

const std::string http_utils::http_header_content_range =

MHD_HTTP_HEADER_CONTENT_RANGE;

const std::string http_utils::http_header_content_type =

MHD_HTTP_HEADER_CONTENT_TYPE;

const std::string http_utils::http_header_date = MHD_HTTP_HEADER_DATE;

const std::string http_utils::http_header_etag = MHD_HTTP_HEADER_ETAG;

const std::string http_utils::http_header_expect = MHD_HTTP_HEADER_EXPECT;

const std::string http_utils::http_header_expires = MHD_HTTP_HEADER_EXPIRES;

const std::string http_utils::http_header_from = MHD_HTTP_HEADER_FROM;

const std::string http_utils::http_header_host = MHD_HTTP_HEADER_HOST;

const std::string http_utils::http_header_if_match = MHD_HTTP_HEADER_IF_MATCH;

const std::string http_utils::http_header_if_modified_since =

MHD_HTTP_HEADER_IF_MODIFIED_SINCE;

const std::string http_utils::http_header_if_none_match =

MHD_HTTP_HEADER_IF_NONE_MATCH;

const std::string http_utils::http_header_if_range = MHD_HTTP_HEADER_IF_RANGE;

const std::string http_utils::http_header_if_unmodified_since =

MHD_HTTP_HEADER_IF_UNMODIFIED_SINCE;

const std::string http_utils::http_header_last_modified =

MHD_HTTP_HEADER_LAST_MODIFIED;

const std::string http_utils::http_header_location = MHD_HTTP_HEADER_LOCATION;

const std::string http_utils::http_header_max_forwards =

MHD_HTTP_HEADER_MAX_FORWARDS;

const std::string http_utils::http_header_pragma = MHD_HTTP_HEADER_PRAGMA;

const std::string http_utils::http_header_proxy_authenticate =

MHD_HTTP_HEADER_PROXY_AUTHENTICATE;

const std::string http_utils::http_header_proxy_authentication =

MHD_HTTP_HEADER_PROXY_AUTHORIZATION;

const std::string http_utils::http_header_range = MHD_HTTP_HEADER_RANGE;

const std::string http_utils::http_header_referer = MHD_HTTP_HEADER_REFERER;

const std::string http_utils::http_header_retry_after =

MHD_HTTP_HEADER_RETRY_AFTER;

const std::string http_utils::http_header_server = MHD_HTTP_HEADER_SERVER;

const std::string http_utils::http_header_te = MHD_HTTP_HEADER_TE;

const std::string http_utils::http_header_trailer = MHD_HTTP_HEADER_TRAILER;

const std::string http_utils::http_header_transfer_encoding =

MHD_HTTP_HEADER_TRANSFER_ENCODING;

const std::string http_utils::http_header_upgrade = MHD_HTTP_HEADER_UPGRADE;

const std::string http_utils::http_header_user_agent =

MHD_HTTP_HEADER_USER_AGENT;

const std::string http_utils::http_header_vary = MHD_HTTP_HEADER_VARY;

const std::string http_utils::http_header_via = MHD_HTTP_HEADER_VIA;

const std::string http_utils::http_header_warning = MHD_HTTP_HEADER_WARNING;

const std::string http_utils::http_header_www_authenticate =

MHD_HTTP_HEADER_WWW_AUTHENTICATE;

const std::string http_utils::http_version_1_0 = MHD_HTTP_VERSION_1_0;

const std::string http_utils::http_version_1_1 = MHD_HTTP_VERSION_1_1;

const std::string http_utils::http_method_connect = MHD_HTTP_METHOD_CONNECT;

const std::string http_utils::http_method_delete = MHD_HTTP_METHOD_DELETE;

const std::string http_utils::http_method_get = MHD_HTTP_METHOD_GET;

const std::string http_utils::http_method_head = MHD_HTTP_METHOD_HEAD;

const std::string http_utils::http_method_options = MHD_HTTP_METHOD_OPTIONS;

const std::string http_utils::http_method_post = MHD_HTTP_METHOD_POST;

const std::string http_utils::http_method_put = MHD_HTTP_METHOD_PUT;

const std::string http_utils::http_method_trace = MHD_HTTP_METHOD_TRACE;

const std::string http_utils::http_method_patch = MHD_HTTP_METHOD_PATCH;

const std::string http_utils::http_post_encoding_form_urlencoded =

MHD_HTTP_POST_ENCODING_FORM_URLENCODED;

const std::string http_utils::http_post_encoding_multipart_formdata =

MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA;

const std::string http_utils::text_plain = "text/plain";

std::vector<std::string> http_utils::tokenize_url(

const std::string& str,

const char separator

)

{

return string_utilities::string_split(str, separator);

}

std::string http_utils::standardize_url(const std::string& url)

{

std::string n_url = url;

std::string::iterator new_end = std::unique(n_url.begin(), n_url.end(), [](char a, char b) { return (a == b) && (a == '/'); });

n_url.erase(new_end, n_url.end());

std::string::size_type n_url_length = n_url.length();

std::string result;

if (n_url_length > 1 && n_url[n_url_length - 1] == '/')

{

result = n_url.substr(0, n_url_length - 1);

}

else

{

result = n_url;

}

return result;

}

std::string get_ip_str(const struct sockaddr *sa, socklen_t maxlen)

{

if (!sa) throw std::invalid_argument("socket pointer is null");

char to_ret[NI_MAXHOST];

if (AF_INET6 == sa->sa_family)

{

inet_ntop(AF_INET6, &(((sockaddr_in6*) sa)->sin6_addr), to_ret, INET6_ADDRSTRLEN);

return to_ret;

}

else if (AF_INET == sa->sa_family)

{

inet_ntop(AF_INET, &(((sockaddr_in*) sa)->sin_addr), to_ret, INET_ADDRSTRLEN);

return to_ret;

}

else

{

throw std::invalid_argument("IP family must be either AF_INET or AF_INET6");

}

unsigned short get_port(const struct sockaddr* sa)

{

if (!sa) throw std::invalid_argument("socket pointer is null");

if (sa->sa_family == AF_INET)

{

return ((struct sockaddr_in*) sa)->sin_port;

}

else if (sa->sa_family == AF_INET6)

{

return ((struct sockaddr_in6*) sa)->sin6_port;

}

else

{

throw std::invalid_argument("IP family must be either AF_INET or AF_INET6");

}

size_t http_unescape(std::string& val)

{

if (val.empty()) return 0;

int rpos = 0;

int wpos = 0;

unsigned int num;

while ('\0' != val[rpos])

{

switch (val[rpos])

{

case '+':

val[wpos] = ' ';

wpos++;

rpos++;

break;

case '%':

if ( (1 == sscanf (val.substr(rpos + 1).c_str(), "%2x", &num)) ||

(1 == sscanf (val.substr(rpos + 1).c_str(), "%2X", &num))

)

{

val[wpos] = (unsigned char) num;

wpos++;

rpos += 3;

break;

}

/* intentional fall through! */

default:

val[wpos] = val[rpos];

wpos++;

rpos++;

}

val[wpos] = '\0'; /* add 0-terminator */

val.resize(wpos);

return wpos; /* = strlen(val) */

}

ip_representation::ip_representation(const struct sockaddr* ip)

{

std::fill(pieces, pieces + 16, 0);

if(ip->sa_family == AF_INET)

{

ip_version = http_utils::IPV4;

for(int i=0;i<4;i++)

{

pieces[12+i]=((u_char*)&(((struct sockaddr_in *)ip)->sin_addr))[i];

}

else

{

ip_version = http_utils::IPV6;

for (int i = 0; i < 16; i++)

{

pieces[i] = ((u_char*)&(((struct sockaddr_in6 *)ip)->sin6_addr))[i];

}

mask = DEFAULT_MASK_VALUE;

}

ip_representation::ip_representation(const std::string& ip)

{

std::vector<std::string> parts;

mask = DEFAULT_MASK_VALUE;

std::fill(pieces, pieces + 16, 0);

if(ip.find(':') != std::string::npos) //IPV6

{

ip_version = http_utils::IPV6;

parts = string_utilities::string_split(ip, ':', false);

if (parts.size() > 8)

{

throw std::invalid_argument("IP is badly formatted. Max 8 parts in IPV6.");

}

unsigned int omitted = 8 - (parts.size() - 1);

if (omitted != 0)

{

int empty_count = 0;

for (unsigned int i = 0; i < parts.size(); i++)

{

if (parts[i].size() == 0) empty_count++;

}

if (empty_count > 1)

{

if (parts[parts.size() - 1].find(".") != std::string::npos) omitted -= 1;

if (empty_count == 2 && parts[0] == "" && parts[1] == "")

{

omitted += 1;

parts = std::vector<std::string>(parts.begin() + 1, parts.end());

}

else

{

throw std::invalid_argument("IP is badly formatted. Cannot have more than one omitted segment in IPV6.");

}

int y = 0;

for (unsigned int i = 0; i < parts.size(); i++)

{

if (parts[i] != "*")

{

if (parts[i].size() == 0)

{

for (unsigned int omitted_idx = 0; omitted_idx < omitted; omitted_idx++)

{

pieces[y] = 0;

pieces[y+1] = 0;

y += 2;

}

continue;

}

if (parts[i].size() < 4)

{

stringstream ss;

ss << setfill('0') << setw(4) << parts[i];

parts[i] = ss.str();

}

if (parts[i].size() == 4)

{

pieces[y] = strtol((parts[i].substr(0,2)).c_str(),NULL,16);

pieces[y+1] = strtol(

(parts[i].substr(2,2)).c_str(),

NULL,

);

y += 2;

}

else

{

if(parts[i].find('.') != std::string::npos)

{

if(y != 12)

{

throw std::invalid_argument("IP is badly formatted. Missing parts before nested IPV4.");

}

if (i != parts.size() - 1)

{

throw std::invalid_argument("IP is badly formatted. Nested IPV4 should be at the end");

}

vector<string> subparts = string_utilities::string_split(parts[i], '.');

if(subparts.size() == 4)

{

for (unsigned int k = 0; k < 10; k++)

{

if (pieces[k] != 0) throw std::invalid_argument("IP is badly formatted. Nested IPV4 can be preceded only by 0 (and, optionally, two 255 octects)");

}

if ((pieces[10] != 0 && pieces[10] != 255) || (pieces[11] != 0 && pieces[11] != 255))

{

throw std::invalid_argument("IP is badly formatted. Nested IPV4 can be preceded only by 0 (and, optionally, two 255 octects)");

}

for(unsigned int ii = 0; ii < subparts.size(); ii++)

{

if(subparts[ii] != "*")

{

pieces[y+ii] = strtol(

subparts[ii].c_str(),

NULL,

);

if (pieces[y+ii] > 255) throw std::invalid_argument("IP is badly formatted. 255 is max value for ip part.");

}

else

{

CLEAR_BIT(mask, y+ii);

}

else

{

throw std::invalid_argument("IP is badly formatted. Nested IPV4 can have max 4 parts.");

}

else

{

throw std::invalid_argument("IP is badly formatted. IPV6 parts can have max 4 characters (or nest an IPV4)");

}

else

{

CLEAR_BIT(mask, y);

CLEAR_BIT(mask, y+1);

y+=2;

}

else //IPV4

{

ip_version = http_utils::IPV4;

parts = string_utilities::string_split(ip, '.');

if(parts.size() == 4)

{

for(unsigned int i = 0; i < parts.size(); i++)

{

if(parts[i] != "*")

{

pieces[12+i] = strtol(parts[i].c_str(), NULL, 10);

if (pieces[12+i] > 255) throw std::invalid_argument("IP is badly formatted. 255 is max value for ip part.");

}

else

{

CLEAR_BIT(mask, 12+i);

}

else

{

throw std::invalid_argument("IP is badly formatted. Max 4 parts in IPV4.");

}

bool ip_representation::operator <(const ip_representation& b) const

{

long this_score = 0;

long b_score = 0;

for (int i = 0; i < 16; i++)

{

if (i == 10 || i == 11) continue;

if (CHECK_BIT(this->mask, i) && CHECK_BIT(b.mask, i))

{

this_score += (16 - i) * this->pieces[i];

b_score += (16 - i) * b.pieces[i];

}

if (this_score == b_score &&

((this->pieces[10] == 0x00 || this->pieces[10] == 0xFF) && (b.pieces[10] == 0x00 || b.pieces[10] == 0xFF)) &&

((this->pieces[11] == 0x00 || this->pieces[11] == 0xFF) && (b.pieces[11] == 0x00 || b.pieces[11] == 0xFF))

)

{

return false;

}

for (int i = 10; i < 12; i++)

{

if (CHECK_BIT(this->mask, i) && CHECK_BIT(b.mask, i))

{

this_score += (16 - i) * this->pieces[i];

b_score += (16 - i) * b.pieces[i];

}

return this_score < b_score;

}

const std::string load_file (const std::string& filename)

{

ifstream fp(filename.c_str(), ios::in | ios::binary | ios::ate);

if(fp.is_open())

{

std::string content;

fp.seekg(0, fp.end);

content.reserve(fp.tellg());

fp.seekg(0, fp.beg);

content.assign((std::istreambuf_iterator<char>(fp)), std::istreambuf_iterator<char>());

return content;

}

else

{

throw std::invalid_argument("Unable to open file");

}

void dump_header_map(std::ostream &os, const std::string &prefix,

const std::map<std::string,std::string,header_comparator> &map)

{

std::map<std::string,std::string,header_comparator>::const_iterator it = map.begin();

std::map<std::string,std::string,header_comparator>::const_iterator end = map.end();

if (map.size()) {

os << " " << prefix << " [";

for (; it != end; ++it) {

os << (*it).first << ":\"" << (*it).second << "\" ";

}

os << "]" << std::endl;

}

void dump_arg_map(std::ostream &os, const std::string &prefix,

const std::map<std::string,std::string,arg_comparator> &map)

{

std::map<std::string,std::string,arg_comparator>::const_iterator it = map.begin();

std::map<std::string,std::string,arg_comparator>::const_iterator end = map.end();

if (map.size()) {

os << " " << prefix << " [";

for (; it != end; ++it) {

os << (*it).first << ":\"" << (*it).second << "\" ";

}

os << "]" << std::endl;

}

size_t base_unescaper(std::string& s, unescaper_ptr unescaper)

{

if(s[0] == 0) return 0;

if(unescaper != 0x0)

{

unescaper(s);

return s.size();

}

return http_unescape(s);

}

};

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