libhttpserver/src/http_utils.cpp at master · gre-42/libhttpserver · GitHub

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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 "httpserver/http_utils.hpp"

#if defined(_WIN32) && !defined(__CYGWIN__)

#include <winsock2.h>

#include <ws2tcpip.h>

#else // WIN32 check

#include <arpa/inet.h>

#include <netdb.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/types.h>

#endif // WIN32 check

#include <stdio.h>

#include <stdlib.h>

#include <fstream>

#include <iomanip>

#include <iterator>

#include <memory>

#include <sstream>

#include <stdexcept>

#include <utility>

#include "httpserver/string_utilities.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)))

#if defined (__CYGWIN__)

#if !defined (NI_MAXHOST)

#define NI_MAXHOST 1025

#endif // NI_MAXHOST

#ifndef __u_char_defined

typedef unsigned char u_char;

#define __u_char_defined

#endif // __u_char_defined

#endif // CYGWIN

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 char* http_utils::http_header_accept = MHD_HTTP_HEADER_ACCEPT;

const char* http_utils::http_header_accept_charset = MHD_HTTP_HEADER_ACCEPT_CHARSET;

const char* http_utils::http_header_accept_encoding = MHD_HTTP_HEADER_ACCEPT_ENCODING;

const char* http_utils::http_header_accept_language = MHD_HTTP_HEADER_ACCEPT_LANGUAGE;

const char* http_utils::http_header_accept_ranges = MHD_HTTP_HEADER_ACCEPT_RANGES;

const char* http_utils::http_header_age = MHD_HTTP_HEADER_AGE;

const char* http_utils::http_header_allow = MHD_HTTP_HEADER_ALLOW;

const char* http_utils::http_header_authorization = MHD_HTTP_HEADER_AUTHORIZATION;

const char* http_utils::http_header_cache_control = MHD_HTTP_HEADER_CACHE_CONTROL;

const char* http_utils::http_header_connection = MHD_HTTP_HEADER_CONNECTION;

const char* http_utils::http_header_content_encoding = MHD_HTTP_HEADER_CONTENT_ENCODING;

const char* http_utils::http_header_content_language = MHD_HTTP_HEADER_CONTENT_LANGUAGE;

const char* http_utils::http_header_content_length = MHD_HTTP_HEADER_CONTENT_LENGTH;

const char* http_utils::http_header_content_location = MHD_HTTP_HEADER_CONTENT_LOCATION;

const char* http_utils::http_header_content_md5 = MHD_HTTP_HEADER_CONTENT_MD5;

const char* http_utils::http_header_content_range = MHD_HTTP_HEADER_CONTENT_RANGE;

const char* http_utils::http_header_content_type = MHD_HTTP_HEADER_CONTENT_TYPE;

const char* http_utils::http_header_date = MHD_HTTP_HEADER_DATE;

const char* http_utils::http_header_etag = MHD_HTTP_HEADER_ETAG;

const char* http_utils::http_header_expect = MHD_HTTP_HEADER_EXPECT;

const char* http_utils::http_header_expires = MHD_HTTP_HEADER_EXPIRES;

const char* http_utils::http_header_from = MHD_HTTP_HEADER_FROM;

const char* http_utils::http_header_host = MHD_HTTP_HEADER_HOST;

const char* http_utils::http_header_if_match = MHD_HTTP_HEADER_IF_MATCH;

const char* http_utils::http_header_if_modified_since = MHD_HTTP_HEADER_IF_MODIFIED_SINCE;

const char* http_utils::http_header_if_none_match = MHD_HTTP_HEADER_IF_NONE_MATCH;

const char* http_utils::http_header_if_range = MHD_HTTP_HEADER_IF_RANGE;

const char* http_utils::http_header_if_unmodified_since = MHD_HTTP_HEADER_IF_UNMODIFIED_SINCE;

const char* http_utils::http_header_last_modified = MHD_HTTP_HEADER_LAST_MODIFIED;

const char* http_utils::http_header_location = MHD_HTTP_HEADER_LOCATION;

const char* http_utils::http_header_max_forwards = MHD_HTTP_HEADER_MAX_FORWARDS;

const char* http_utils::http_header_pragma = MHD_HTTP_HEADER_PRAGMA;

const char* http_utils::http_header_proxy_authenticate = MHD_HTTP_HEADER_PROXY_AUTHENTICATE;

const char* http_utils::http_header_proxy_authentication = MHD_HTTP_HEADER_PROXY_AUTHORIZATION;

const char* http_utils::http_header_range = MHD_HTTP_HEADER_RANGE;

const char* http_utils::http_header_referer = MHD_HTTP_HEADER_REFERER;

const char* http_utils::http_header_retry_after = MHD_HTTP_HEADER_RETRY_AFTER;

const char* http_utils::http_header_server = MHD_HTTP_HEADER_SERVER;

const char* http_utils::http_header_te = MHD_HTTP_HEADER_TE;

const char* http_utils::http_header_trailer = MHD_HTTP_HEADER_TRAILER;

const char* http_utils::http_header_transfer_encoding = MHD_HTTP_HEADER_TRANSFER_ENCODING;

const char* http_utils::http_header_upgrade = MHD_HTTP_HEADER_UPGRADE;

const char* http_utils::http_header_user_agent = MHD_HTTP_HEADER_USER_AGENT;

const char* http_utils::http_header_vary = MHD_HTTP_HEADER_VARY;

const char* http_utils::http_header_via = MHD_HTTP_HEADER_VIA;

const char* http_utils::http_header_warning = MHD_HTTP_HEADER_WARNING;

const char* http_utils::http_header_www_authenticate = MHD_HTTP_HEADER_WWW_AUTHENTICATE;

const char* http_utils::http_version_1_0 = MHD_HTTP_VERSION_1_0;

const char* http_utils::http_version_1_1 = MHD_HTTP_VERSION_1_1;

const char* http_utils::http_method_connect = MHD_HTTP_METHOD_CONNECT;

const char* http_utils::http_method_delete = MHD_HTTP_METHOD_DELETE;

const char* http_utils::http_method_get = MHD_HTTP_METHOD_GET;

const char* http_utils::http_method_head = MHD_HTTP_METHOD_HEAD;

const char* http_utils::http_method_options = MHD_HTTP_METHOD_OPTIONS;

const char* http_utils::http_method_post = MHD_HTTP_METHOD_POST;

const char* http_utils::http_method_put = MHD_HTTP_METHOD_PUT;

const char* http_utils::http_method_trace = MHD_HTTP_METHOD_TRACE;

const char* http_utils::http_method_patch = MHD_HTTP_METHOD_PATCH;

const char* http_utils::http_post_encoding_form_urlencoded = MHD_HTTP_POST_ENCODING_FORM_URLENCODED;

const char* http_utils::http_post_encoding_multipart_formdata = MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA;

const char* 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) {

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, &((reinterpret_cast<const sockaddr_in6*>(sa))->sin6_addr), to_ret, INET6_ADDRSTRLEN);

return to_ret;

} else if (AF_INET == sa->sa_family) {

inet_ntop(AF_INET, &((reinterpret_cast<const 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");

}

uint16_t get_port(const struct sockaddr* sa) {

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

if (sa->sa_family == AF_INET) {

return (reinterpret_cast<const struct sockaddr_in*>(sa))->sin_port;

} else if (sa->sa_family == AF_INET6) {

return (reinterpret_cast<const 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;

unsigned int rpos = 0;

unsigned int wpos = 0;

unsigned int num;

unsigned int size = val->size();

while (rpos < size && (*val)[rpos] != '\0') {

switch ((*val)[rpos]) {

case '+':

(*val)[wpos] = ' ';

wpos++;

rpos++;

break;

case '%':

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

const in_addr* sin_addr_pt = &((reinterpret_cast<const struct sockaddr_in*>(ip))->sin_addr);

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

pieces[12 + i] = (reinterpret_cast<const u_char*>(sin_addr_pt))[i];

}

} else {

ip_version = http_utils::IPV6;

const in6_addr* sin_addr6_pt = &((reinterpret_cast<const struct sockaddr_in6*>(ip))->sin6_addr);

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

pieces[i] = (reinterpret_cast<const u_char*>(sin_addr6_pt))[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) {

std::stringstream ss;

ss << std::setfill('0') << std::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, 16);

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");

}

std::vector<std::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, 10);

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 {

int64_t this_score = 0;

int64_t b_score = 0;

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

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

if (CHECK_BIT(mask, i) && CHECK_BIT(b.mask, i)) {

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

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

}

if (this_score == b_score &&

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

((pieces[11] == 0x00 || pieces[11] == 0xFF) && (b.pieces[11] == 0x00 || b.pieces[11] == 0xFF))) {

return false;

}

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

if (CHECK_BIT(mask, i) && CHECK_BIT(b.mask, i)) {

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

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

}

return this_score < b_score;

}

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

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

}

} // namespace http

} // namespace httpserver

libhttpserver/src/http_utils.cpp at master · gre-42/libhttpserver · GitHub

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