#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include char const * const httpcodeToStr(int const httpcode) /*{{{*/ { switch (httpcode) { // Informational 1xx case 100: return "100 Continue"; case 101: return "101 Switching Protocols"; // Successful 2xx case 200: return "200 OK"; case 201: return "201 Created"; case 202: return "202 Accepted"; case 203: return "203 Non-Authoritative Information"; case 204: return "204 No Content"; case 205: return "205 Reset Content"; case 206: return "206 Partial Content"; // Redirections 3xx case 300: return "300 Multiple Choices"; case 301: return "301 Moved Permanently"; case 302: return "302 Found"; case 303: return "303 See Other"; case 304: return "304 Not Modified"; case 305: return "304 Use Proxy"; case 307: return "307 Temporary Redirect"; // Client errors 4xx case 400: return "400 Bad Request"; case 401: return "401 Unauthorized"; case 402: return "402 Payment Required"; case 403: return "403 Forbidden"; case 404: return "404 Not Found"; case 405: return "405 Method Not Allowed"; case 406: return "406 Not Acceptable"; case 407: return "407 Proxy Authentication Required"; case 408: return "408 Request Time-out"; case 409: return "409 Conflict"; case 410: return "410 Gone"; case 411: return "411 Length Required"; case 412: return "412 Precondition Failed"; case 413: return "413 Request Entity Too Large"; case 414: return "414 Request-URI Too Large"; case 415: return "415 Unsupported Media Type"; case 416: return "416 Requested range not satisfiable"; case 417: return "417 Expectation Failed"; case 418: return "418 I'm a teapot"; // Server error 5xx case 500: return "500 Internal Server Error"; case 501: return "501 Not Implemented"; case 502: return "502 Bad Gateway"; case 503: return "503 Service Unavailable"; case 504: return "504 Gateway Time-out"; case 505: return "505 HTTP Version not supported"; } return NULL; } /*}}}*/ void addFileHeaders(std::list &headers, FileFd &data) /*{{{*/ { std::ostringstream contentlength; contentlength << "Content-Length: " << data.FileSize(); headers.push_back(contentlength.str()); std::string lastmodified("Last-Modified: "); lastmodified.append(TimeRFC1123(data.ModificationTime())); headers.push_back(lastmodified); } /*}}}*/ void addDataHeaders(std::list &headers, std::string &data) /*{{{*/ { std::ostringstream contentlength; contentlength << "Content-Length: " << data.size(); headers.push_back(contentlength.str()); } /*}}}*/ bool sendHead(int const client, int const httpcode, std::list &headers)/*{{{*/ { std::string response("HTTP/1.1 "); response.append(httpcodeToStr(httpcode)); headers.push_front(response); headers.push_back("Server: APT webserver"); std::string date("Date: "); date.append(TimeRFC1123(time(NULL))); headers.push_back(date); std::clog << ">>> RESPONSE >>>" << std::endl; bool Success = true; for (std::list::const_iterator h = headers.begin(); Success == true && h != headers.end(); ++h) { Success &= FileFd::Write(client, h->c_str(), h->size()); if (Success == true) Success &= FileFd::Write(client, "\r\n", 2); std::clog << *h << std::endl; } if (Success == true) Success &= FileFd::Write(client, "\r\n", 2); std::clog << "<<<<<<<<<<<<<<<<" << std::endl; return Success; } /*}}}*/ bool sendFile(int const client, FileFd &data) /*{{{*/ { bool Success = true; char buffer[500]; unsigned long long actual = 0; while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true) { if (actual == 0) break; if (Success == true) Success &= FileFd::Write(client, buffer, actual); } if (Success == true) Success &= FileFd::Write(client, "\r\n", 2); return Success; } /*}}}*/ bool sendData(int const client, std::string const &data) /*{{{*/ { bool Success = true; Success &= FileFd::Write(client, data.c_str(), data.size()); if (Success == true) Success &= FileFd::Write(client, "\r\n", 2); return Success; } /*}}}*/ void sendError(int const client, int const httpcode, std::string const &request,/*{{{*/ bool content, std::string const &error = "") { std::list headers; std::string response(""); response.append(httpcodeToStr(httpcode)).append(""); response.append("

").append(httpcodeToStr(httpcode)).append("

"); if (error.empty() == false) response.append("

Error: ").append(error).append("

"); response.append("This error is a result of the request:
");
   response.append(request).append("
"); addDataHeaders(headers, response); sendHead(client, httpcode, headers); if (content == true) sendData(client, response); } /*}}}*/ bool parseFirstLine(int const client, std::string const &request, /*{{{*/ std::string &filename, bool &sendContent, bool &closeConnection) { if (strncmp(request.c_str(), "HEAD ", 5) == 0) sendContent = false; if (strncmp(request.c_str(), "GET ", 4) != 0) { sendError(client, 501, request, true); return false; } size_t const lineend = request.find('\n'); size_t filestart = request.find(' '); for (; request[filestart] == ' '; ++filestart); size_t fileend = request.rfind(' ', lineend); if (lineend == std::string::npos || filestart == std::string::npos || fileend == std::string::npos || filestart == fileend) { sendError(client, 500, request, sendContent, "Filename can't be extracted"); return false; } size_t httpstart = fileend; for (; request[httpstart] == ' '; ++httpstart); if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0) closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0; else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0) closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0; else { sendError(client, 500, request, sendContent, "Not a HTTP/1.{0,1} request"); return false; } filename = request.substr(filestart, fileend - filestart); if (filename.find(' ') != std::string::npos) { sendError(client, 500, request, sendContent, "Filename contains an unencoded space"); return false; } filename = DeQuoteString(filename); // this is not a secure server, but at least prevent the obvious … if (filename.empty() == true || filename[0] != '/' || strncmp(filename.c_str(), "//", 2) == 0 || filename.find_first_of("\r\n\t\f\v") != std::string::npos || filename.find("/../") != std::string::npos) { sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)"); return false; } // nuke the first character which is a / as we assured above filename.erase(0, 1); if (filename.empty() == true) filename = "."; return true; } /*}}}*/ int main(int const argc, const char * argv[]) { CommandLine::Args Args[] = { {0, "port", "aptwebserver::port", CommandLine::HasArg}, {'c',"config-file",0,CommandLine::ConfigFile}, {'o',"option",0,CommandLine::ArbItem}, {0,0,0,0} }; CommandLine CmdL(Args, _config); if(CmdL.Parse(argc,argv) == false) { _error->DumpErrors(); exit(1); } // create socket, bind and listen to it {{{ // ignore SIGPIPE, this can happen on write() if the socket closes connection signal(SIGPIPE, SIG_IGN); int sock = socket(AF_INET6, SOCK_STREAM, 0); if(sock < 0) { _error->Errno("aptwerbserver", "Couldn't create socket"); _error->DumpErrors(std::cerr); return 1; } int const port = _config->FindI("aptwebserver::port", 8080); // ensure that we accept all connections: v4 or v6 int const iponly = 0; setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly)); // to not linger on an address int const enable = 1; setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)); struct sockaddr_in6 locAddr; memset(&locAddr, 0, sizeof(locAddr)); locAddr.sin6_family = AF_INET6; locAddr.sin6_port = htons(port); locAddr.sin6_addr = in6addr_any; if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0) { _error->Errno("aptwerbserver", "Couldn't bind"); _error->DumpErrors(std::cerr); return 2; } std::clog << "Serving ANY file on port: " << port << std::endl; listen(sock, 1); /*}}}*/ std::vector messages; int client; while ((client = accept(sock, NULL, NULL)) != -1) { std::clog << "ACCEPT client " << client << " on socket " << sock << std::endl; while (ReadMessages(client, messages)) { bool closeConnection = false; for (std::vector::const_iterator m = messages.begin(); m != messages.end() && closeConnection == false; ++m) { std::clog << ">>> REQUEST >>>>" << std::endl << *m << std::endl << "<<<<<<<<<<<<<<<<" << std::endl; std::list headers; std::string filename; bool sendContent = true; if (parseFirstLine(client, *m, filename, sendContent, closeConnection) == false) continue; std::string host = LookupTag(*m, "Host", ""); if (host.empty() == true) { // RFC 2616 §14.23 requires Host sendError(client, 400, *m, sendContent, "Host header is required"); continue; } if (RealFileExists(filename) == true) { FileFd data(filename, FileFd::ReadOnly); std::string condition = LookupTag(*m, "If-Modified-Since", ""); if (condition.empty() == false) { time_t cache; if (RFC1123StrToTime(condition.c_str(), cache) == true && cache >= data.ModificationTime()) { sendHead(client, 304, headers); continue; } } addFileHeaders(headers, data); sendHead(client, 200, headers); if (sendContent == true) sendFile(client, data); } else sendError(client, 404, *m, sendContent); } _error->DumpErrors(std::cerr); messages.clear(); if (closeConnection == true) break; } std::clog << "CLOSE client " << client << " on socket " << sock << std::endl; close(client); } return 0; }