tcp_http.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD 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, version 2.
00006  * OpenTTD 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.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00014 #ifdef ENABLE_NETWORK
00015 
00016 #include "../../stdafx.h"
00017 #include "../../debug.h"
00018 #include "../../rev.h"
00019 #include "../network_func.h"
00020 
00021 #include "tcp_http.h"
00022 
00024 static SmallVector<NetworkHTTPSocketHandler *, 1> _http_connections;
00025 
00035 NetworkHTTPSocketHandler::NetworkHTTPSocketHandler(SOCKET s,
00036     HTTPCallback *callback, const char *host, const char *url,
00037     const char *data, int depth) :
00038   NetworkSocketHandler(),
00039   recv_pos(0),
00040   recv_length(0),
00041   callback(callback),
00042   data(data),
00043   redirect_depth(depth),
00044   sock(s)
00045 {
00046   size_t bufferSize = strlen(url) + strlen(host) + strlen(_openttd_revision) + (data == NULL ? 0 : strlen(data)) + 128;
00047   char *buffer = AllocaM(char, bufferSize);
00048 
00049   DEBUG(net, 7, "[tcp/http] requesting %s%s", host, url);
00050   if (data != NULL) {
00051     seprintf(buffer, buffer + bufferSize - 1, "POST %s HTTP/1.0\r\nHost: %s\r\nUser-Agent: OpenTTD/%s\r\nContent-Type: text/plain\r\nContent-Length: %d\r\n\r\n%s\r\n", url, host, _openttd_revision, (int)strlen(data), data);
00052   } else {
00053     seprintf(buffer, buffer + bufferSize - 1, "GET %s HTTP/1.0\r\nHost: %s\r\nUser-Agent: OpenTTD/%s\r\n\r\n", url, host, _openttd_revision);
00054   }
00055 
00056   ssize_t size = strlen(buffer);
00057   ssize_t res = send(this->sock, (const char*)buffer, size, 0);
00058   if (res != size) {
00059     /* Sending all data failed. Socket can't handle this little bit
00060      * of information? Just fall back to the old system! */
00061     this->callback->OnFailure();
00062     delete this;
00063     return;
00064   }
00065 
00066   *_http_connections.Append() = this;
00067 }
00068 
00070 NetworkHTTPSocketHandler::~NetworkHTTPSocketHandler()
00071 {
00072   this->CloseConnection();
00073 
00074   if (this->sock != INVALID_SOCKET) closesocket(this->sock);
00075   this->sock = INVALID_SOCKET;
00076   free((void*)this->data);
00077 }
00078 
00079 NetworkRecvStatus NetworkHTTPSocketHandler::CloseConnection(bool error)
00080 {
00081   NetworkSocketHandler::CloseConnection(error);
00082   return NETWORK_RECV_STATUS_OKAY;
00083 }
00084 
00089 #define return_error(msg) { DEBUG(net, 0, msg); return -1; }
00090 
00091 static const char * const NEWLINE        = "\r\n";             
00092 static const char * const END_OF_HEADER  = "\r\n\r\n";         
00093 static const char * const HTTP_1_0       = "HTTP/1.0 ";        
00094 static const char * const HTTP_1_1       = "HTTP/1.1 ";        
00095 static const char * const CONTENT_LENGTH = "Content-Length: "; 
00096 static const char * const LOCATION       = "Location: ";       
00097 
00108 int NetworkHTTPSocketHandler::HandleHeader()
00109 {
00110   assert(strlen(HTTP_1_0) == strlen(HTTP_1_1));
00111   assert(strstr(this->recv_buffer, END_OF_HEADER) != NULL);
00112 
00113   /* We expect a HTTP/1.[01] reply */
00114   if (strncmp(this->recv_buffer, HTTP_1_0, strlen(HTTP_1_0)) != 0 &&
00115       strncmp(this->recv_buffer, HTTP_1_1, strlen(HTTP_1_1)) != 0) {
00116     return_error("[tcp/http] received invalid HTTP reply");
00117   }
00118 
00119   char *status = this->recv_buffer + strlen(HTTP_1_0);
00120   if (strncmp(status, "200", 3) == 0) {
00121     /* We are going to receive a document. */
00122 
00123     /* Get the length of the document to receive */
00124     char *length = strcasestr(this->recv_buffer, CONTENT_LENGTH);
00125     if (length == NULL) return_error("[tcp/http] missing 'content-length' header");
00126 
00127     /* Skip the header */
00128     length += strlen(CONTENT_LENGTH);
00129 
00130     /* Search the end of the line. This is safe because the header will
00131      * always end with two newlines. */
00132     char *end_of_line = strstr(length, NEWLINE);
00133 
00134     /* Read the length */
00135     *end_of_line = '\0';
00136     int len = atoi(length);
00137     /* Restore the header. */
00138     *end_of_line = '\r';
00139 
00140     /* Make sure we're going to download at least something;
00141      * zero sized files are, for OpenTTD's purposes, always
00142      * wrong. You can't have gzips of 0 bytes! */
00143     if (len == 0) return_error("[tcp/http] refusing to download 0 bytes");
00144 
00145     DEBUG(net, 7, "[tcp/http] downloading %i bytes", len);
00146     return len;
00147   }
00148 
00149   if (strncmp(status, "301", 3) != 0 &&
00150       strncmp(status, "302", 3) != 0 &&
00151       strncmp(status, "303", 3) != 0 &&
00152       strncmp(status, "307", 3) != 0) {
00153     /* We are not going to be redirected :(. */
00154 
00155     /* Search the end of the line. This is safe because the header will
00156      * always end with two newlines. */
00157     *strstr(status, NEWLINE) = '\0';
00158     DEBUG(net, 0, "[tcp/http] unhandled status reply %s", status);
00159     return -1;
00160   }
00161 
00162   if (this->redirect_depth == 5) return_error("[tcp/http] too many redirects, looping redirects?");
00163 
00164   /* Redirect to other URL */
00165   char *uri = strcasestr(this->recv_buffer, LOCATION);
00166   if (uri == NULL) return_error("[tcp/http] missing 'location' header for redirect");
00167 
00168   uri += strlen(LOCATION);
00169 
00170   /* Search the end of the line. This is safe because the header will
00171    * always end with two newlines. */
00172   char *end_of_line = strstr(uri, NEWLINE);
00173   *end_of_line = '\0';
00174 
00175   DEBUG(net, 6, "[tcp/http] redirecting to %s", uri);
00176 
00177   int ret = NetworkHTTPSocketHandler::Connect(uri, this->callback, this->data, this->redirect_depth + 1);
00178   if (ret != 0) return ret;
00179 
00180   /* We've relinguished control of data now. */
00181   this->data = NULL;
00182 
00183   /* Restore the header. */
00184   *end_of_line = '\r';
00185   return 0;
00186 }
00187 
00195 /* static */ int NetworkHTTPSocketHandler::Connect(char *uri, HTTPCallback *callback, const char *data, int depth)
00196 {
00197   char *hname = strstr(uri, "://");
00198   if (hname == NULL) return_error("[tcp/http] invalid location");
00199 
00200   hname += 3;
00201 
00202   char *url = strchr(hname, '/');
00203   if (url == NULL) return_error("[tcp/http] invalid location");
00204 
00205   *url = '\0';
00206 
00207   /* Fetch the hostname, and possible port number. */
00208   const char *company = NULL;
00209   const char *port = NULL;
00210   ParseConnectionString(&company, &port, hname);
00211   if (company != NULL) return_error("[tcp/http] invalid hostname");
00212 
00213   NetworkAddress address(hname, port == NULL ? 80 : atoi(port));
00214 
00215   /* Restore the URL. */
00216   *url = '/';
00217   new NetworkHTTPContentConnecter(address, callback, url, data, depth);
00218   return 0;
00219 }
00220 
00221 #undef return_error
00222 
00230 int NetworkHTTPSocketHandler::Receive()
00231 {
00232   for (;;) {
00233     ssize_t res = recv(this->sock, (char *)this->recv_buffer + this->recv_pos, lengthof(this->recv_buffer) - this->recv_pos, 0);
00234     if (res == -1) {
00235       int err = GET_LAST_ERROR();
00236       if (err != EWOULDBLOCK) {
00237         /* Something went wrong... (104 is connection reset by peer) */
00238         if (err != 104) DEBUG(net, 0, "recv failed with error %d", err);
00239         return -1;
00240       }
00241       /* Connection would block, so stop for now */
00242       return 1;
00243     }
00244 
00245     /* No more data... did we get everything we wanted? */
00246     if (res == 0) {
00247       if (this->recv_length != 0) return -1;
00248 
00249       this->callback->OnReceiveData(NULL, 0);
00250       return 0;
00251     }
00252 
00253     /* Wait till we read the end-of-header identifier */
00254     if (this->recv_length == 0) {
00255       int read = this->recv_pos + res;
00256       int end = min(read, lengthof(this->recv_buffer) - 1);
00257 
00258       /* Do a 'safe' search for the end of the header. */
00259       char prev = this->recv_buffer[end];
00260       this->recv_buffer[end] = '\0';
00261       char *end_of_header = strstr(this->recv_buffer, END_OF_HEADER);
00262       this->recv_buffer[end] = prev;
00263 
00264       if (end_of_header == NULL) {
00265         if (read == lengthof(this->recv_buffer)) {
00266           DEBUG(net, 0, "[tcp/http] header too big");
00267           return -1;
00268         }
00269         this->recv_pos = read;
00270       } else {
00271         int ret = this->HandleHeader();
00272         if (ret <= 0) return ret;
00273 
00274         this->recv_length = ret;
00275 
00276         end_of_header += strlen(END_OF_HEADER);
00277         int len = min(read - (end_of_header - this->recv_buffer), res);
00278         if (len != 0) {
00279           this->callback->OnReceiveData(end_of_header, len);
00280           this->recv_length -= len;
00281         }
00282 
00283         this->recv_pos = 0;
00284       }
00285     } else {
00286       res = min(this->recv_length, res);
00287       /* Receive whatever we're expecting. */
00288       this->callback->OnReceiveData(this->recv_buffer, res);
00289       this->recv_length -= res;
00290     }
00291   }
00292 }
00293 
00297 /* static */ void NetworkHTTPSocketHandler::HTTPReceive()
00298 {
00299   /* No connections, just bail out. */
00300   if (_http_connections.Length() == 0) return;
00301 
00302   fd_set read_fd;
00303   struct timeval tv;
00304 
00305   FD_ZERO(&read_fd);
00306   for (NetworkHTTPSocketHandler **iter = _http_connections.Begin(); iter < _http_connections.End(); iter++) {
00307     FD_SET((*iter)->sock, &read_fd);
00308   }
00309 
00310   tv.tv_sec = tv.tv_usec = 0; // don't block at all.
00311 #if !defined(__MORPHOS__) && !defined(__AMIGA__)
00312   int n = select(FD_SETSIZE, &read_fd, NULL, NULL, &tv);
00313 #else
00314   int n = WaitSelect(FD_SETSIZE, &read_fd, NULL, NULL, &tv, NULL);
00315 #endif
00316   if (n == -1) return;
00317 
00318   for (NetworkHTTPSocketHandler **iter = _http_connections.Begin(); iter < _http_connections.End(); /* nothing */) {
00319     NetworkHTTPSocketHandler *cur = *iter;
00320 
00321     if (FD_ISSET(cur->sock, &read_fd)) {
00322       int ret = cur->Receive();
00323       /* First send the failure. */
00324       if (ret < 0) cur->callback->OnFailure();
00325       if (ret <= 0) {
00326         /* Then... the connection can be closed */
00327         cur->CloseConnection();
00328         _http_connections.Erase(iter);
00329         delete cur;
00330         continue;
00331       }
00332     }
00333     iter++;
00334   }
00335 }
00336 
00337 #endif /* ENABLE_NETWORK */

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