tcp_http.cpp

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00001 /* $Id: tcp_http.cpp 19090 2010-02-10 21:06:05Z rubidium $ */
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.h"
00022 #include "tcp_http.h"
00023 
00025 static SmallVector<NetworkHTTPSocketHandler *, 1> _http_connections;
00026 
00027 NetworkHTTPSocketHandler::NetworkHTTPSocketHandler(SOCKET s,
00028     HTTPCallback *callback, const char *host, const char *url,
00029     const char *data, int depth) :
00030   NetworkSocketHandler(),
00031   recv_pos(0),
00032   recv_length(0),
00033   callback(callback),
00034   data(data),
00035   redirect_depth(depth),
00036   sock(s)
00037 {
00038   size_t bufferSize = strlen(url) + strlen(host) + strlen(_openttd_revision) + (data == NULL ? 0 : strlen(data)) + 128;
00039   char *buffer = AllocaM(char, bufferSize);
00040 
00041   DEBUG(net, 7, "[tcp/http] requesting %s%s", host, url);
00042   if (data != NULL) {
00043     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);
00044   } else {
00045     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);
00046   }
00047 
00048   ssize_t size = strlen(buffer);
00049   ssize_t res = send(this->sock, (const char*)buffer, size, 0);
00050   if (res != size) {
00051     /* Sending all data failed. Socket can't handle this little bit
00052      * of information? Just fall back to the old system! */
00053     this->callback->OnFailure();
00054     delete this;
00055   }
00056 
00057   *_http_connections.Append() = this;
00058 }
00059 
00060 NetworkHTTPSocketHandler::~NetworkHTTPSocketHandler()
00061 {
00062   this->CloseConnection();
00063 
00064   if (this->sock != INVALID_SOCKET) closesocket(this->sock);
00065   this->sock = INVALID_SOCKET;
00066   free((void*)this->data);
00067 }
00068 
00069 NetworkRecvStatus NetworkHTTPSocketHandler::CloseConnection(bool error)
00070 {
00071   NetworkSocketHandler::CloseConnection(error);
00072   return NETWORK_RECV_STATUS_OKAY;
00073 }
00074 
00079 #define return_error(msg) { DEBUG(net, 0, msg); return -1; }
00080 
00081 static const char * const NEWLINE        = "\r\n";             
00082 static const char * const END_OF_HEADER  = "\r\n\r\n";         
00083 static const char * const HTTP_1_0       = "HTTP/1.0 ";        
00084 static const char * const HTTP_1_1       = "HTTP/1.1 ";        
00085 static const char * const CONTENT_LENGTH = "Content-Length: "; 
00086 static const char * const LOCATION       = "Location: ";       
00087 
00098 int NetworkHTTPSocketHandler::HandleHeader()
00099 {
00100   assert(strlen(HTTP_1_0) == strlen(HTTP_1_1));
00101   assert(strstr(this->recv_buffer, END_OF_HEADER) != NULL);
00102 
00103   /* We expect a HTTP/1.[01] reply */
00104   if (strncmp(this->recv_buffer, HTTP_1_0, strlen(HTTP_1_0)) != 0 &&
00105       strncmp(this->recv_buffer, HTTP_1_1, strlen(HTTP_1_1)) != 0) {
00106     return_error("[tcp/http] received invalid HTTP reply");
00107   }
00108 
00109   char *status = this->recv_buffer + strlen(HTTP_1_0);
00110   if (strncmp(status, "200", 3) == 0) {
00111     /* We are going to receive a document. */
00112 
00113     /* Get the length of the document to receive */
00114     char *length = strcasestr(this->recv_buffer, CONTENT_LENGTH);
00115     if (length == NULL) return_error("[tcp/http] missing 'content-length' header");
00116 
00117     /* Skip the header */
00118     length += strlen(CONTENT_LENGTH);
00119 
00120     /* Search the end of the line. This is safe because the header will
00121      * always end with two newlines. */
00122     char *end_of_line = strstr(length, NEWLINE);
00123 
00124     /* Read the length */
00125     *end_of_line = '\0';
00126     int len = atoi(length);
00127     /* Restore the header. */
00128     *end_of_line = '\r';
00129 
00130     /* Make sure we're going to download at least something;
00131      * zero sized files are, for OpenTTD's purposes, always
00132      * wrong. You can't have gzips of 0 bytes! */
00133     if (len == 0) return_error("[tcp/http] refusing to download 0 bytes");
00134 
00135     DEBUG(net, 7, "[tcp/http] downloading %i bytes", len);
00136     return len;
00137   }
00138 
00139   if (strncmp(status, "301", 3) != 0 &&
00140       strncmp(status, "302", 3) != 0 &&
00141       strncmp(status, "303", 3) != 0 &&
00142       strncmp(status, "307", 3) != 0) {
00143     /* We are not going to be redirected :(. */
00144 
00145     /* Search the end of the line. This is safe because the header will
00146      * always end with two newlines. */
00147     *strstr(status, NEWLINE) = '\0';
00148     DEBUG(net, 0, "[tcp/http] unhandled status reply %s", status);
00149     return -1;
00150   }
00151 
00152   if (this->redirect_depth == 5) return_error("[tcp/http] too many redirects, looping redirects?");
00153 
00154   /* Redirect to other URL */
00155   char *uri = strcasestr(this->recv_buffer, LOCATION);
00156   if (uri == NULL) return_error("[tcp/http] missing 'location' header for redirect");
00157 
00158   uri += strlen(LOCATION);
00159 
00160   /* Search the end of the line. This is safe because the header will
00161    * always end with two newlines. */
00162   char *end_of_line = strstr(uri, NEWLINE);
00163   *end_of_line = '\0';
00164 
00165   DEBUG(net, 6, "[tcp/http] redirecting to %s", uri);
00166 
00167   int ret = NetworkHTTPSocketHandler::Connect(uri, this->callback, this->data, this->redirect_depth + 1);
00168   if (ret != 0) return ret;
00169 
00170   /* We've relinguished control of data now. */
00171   this->data = NULL;
00172 
00173   /* Restore the header. */
00174   *end_of_line = '\r';
00175   return 0;
00176 }
00177 
00178 /* static */ int NetworkHTTPSocketHandler::Connect(char *uri, HTTPCallback *callback, const char *data, int depth)
00179 {
00180   char *hname = strstr(uri, "://");
00181   if (hname == NULL) return_error("[tcp/http] invalid location");
00182 
00183   hname += 3;
00184 
00185   char *url = strchr(hname, '/');
00186   if (url == NULL) return_error("[tcp/http] invalid location");
00187 
00188   *url = '\0';
00189 
00190   /* Fetch the hostname, and possible port number. */
00191   const char *company = NULL;
00192   const char *port = NULL;
00193   ParseConnectionString(&company, &port, hname);
00194   if (company != NULL) return_error("[tcp/http] invalid hostname");
00195 
00196   NetworkAddress address(hname, port == NULL ? 80 : atoi(port));
00197 
00198   /* Restore the URL. */
00199   *url = '/';
00200   new NetworkHTTPContentConnecter(address, callback, url, data, depth);
00201   return 0;
00202 }
00203 
00204 #undef return_error
00205 
00213 int NetworkHTTPSocketHandler::Receive()
00214 {
00215   for (;;) {
00216     ssize_t res = recv(this->sock, (char *)this->recv_buffer + this->recv_pos, lengthof(this->recv_buffer) - this->recv_pos, 0);
00217     if (res == -1) {
00218       int err = GET_LAST_ERROR();
00219       if (err != EWOULDBLOCK) {
00220         /* Something went wrong... (104 is connection reset by peer) */
00221         if (err != 104) DEBUG(net, 0, "recv failed with error %d", err);
00222         return -1;
00223       }
00224       /* Connection would block, so stop for now */
00225       return 1;
00226     }
00227 
00228     /* No more data... did we get everything we wanted? */
00229     if (res == 0) {
00230       if (this->recv_length != 0) return -1;
00231 
00232       this->callback->OnReceiveData(NULL, 0);
00233       return 0;
00234     }
00235 
00236     /* Wait till we read the end-of-header identifier */
00237     if (this->recv_length == 0) {
00238       int read = this->recv_pos + res;
00239       int end = min(read, lengthof(this->recv_buffer) - 1);
00240 
00241       /* Do a 'safe' search for the end of the header. */
00242       char prev = this->recv_buffer[end];
00243       this->recv_buffer[end] = '\0';
00244       char *end_of_header = strstr(this->recv_buffer, END_OF_HEADER);
00245       this->recv_buffer[end] = prev;
00246 
00247       if (end_of_header == NULL) {
00248         if (read == lengthof(this->recv_buffer)) {
00249           DEBUG(net, 0, "[tcp/http] header too big");
00250           return -1;
00251         }
00252         this->recv_pos = read;
00253       } else {
00254         int ret = this->HandleHeader();
00255         if (ret <= 0) return ret;
00256 
00257         this->recv_length = ret;
00258 
00259         end_of_header += strlen(END_OF_HEADER);
00260         int len = min(read - (end_of_header - this->recv_buffer), res);
00261         if (len != 0) {
00262           this->callback->OnReceiveData(end_of_header, len);
00263           this->recv_length -= len;
00264         }
00265 
00266         this->recv_pos = 0;
00267       }
00268     } else {
00269       res = min(this->recv_length, res);
00270       /* Receive whatever we're expecting. */
00271       this->callback->OnReceiveData(this->recv_buffer, res);
00272       this->recv_length -= res;
00273     }
00274   }
00275 }
00276 
00277 /* static */ void NetworkHTTPSocketHandler::HTTPReceive()
00278 {
00279   /* No connections, just bail out. */
00280   if (_http_connections.Length() == 0) return;
00281 
00282   fd_set read_fd;
00283   struct timeval tv;
00284 
00285   FD_ZERO(&read_fd);
00286   for (NetworkHTTPSocketHandler **iter = _http_connections.Begin(); iter < _http_connections.End(); iter++) {
00287     FD_SET((*iter)->sock, &read_fd);
00288   }
00289 
00290   tv.tv_sec = tv.tv_usec = 0; // don't block at all.
00291 #if !defined(__MORPHOS__) && !defined(__AMIGA__)
00292   int n = select(FD_SETSIZE, &read_fd, NULL, NULL, &tv);
00293 #else
00294   int n = WaitSelect(FD_SETSIZE, &read_fd, NULL, NULL, &tv, NULL);
00295 #endif
00296   if (n == -1) return;
00297 
00298   for (NetworkHTTPSocketHandler **iter = _http_connections.Begin(); iter < _http_connections.End(); /* nothing */) {
00299     NetworkHTTPSocketHandler *cur = *iter;
00300 
00301     if (FD_ISSET(cur->sock, &read_fd)) {
00302       int ret = cur->Receive();
00303       /* First send the failure. */
00304       if (ret < 0) cur->callback->OnFailure();
00305       if (ret <= 0) {
00306         /* Then... the connection can be closed */
00307         cur->CloseConnection();
00308         _http_connections.Erase(iter);
00309         delete cur;
00310         continue;
00311       }
00312     }
00313     iter++;
00314   }
00315 }
00316 
00317 #endif /* ENABLE_NETWORK */

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