# 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
    00034 NetworkHTTPSocketHandler::NetworkHTTPSocketHandler(SOCKET s,
    00035     HTTPCallback *callback, const char *host, const char *url,
    00036     const char *data, int depth) :
    00037   NetworkSocketHandler(),
    00038   recv_pos(0),
    00039   recv_length(0),
    00040   callback(callback),
    00041   data(data),
    00042   redirect_depth(depth),
    00043   sock(s)
    00044 {
    00045   size_t bufferSize = strlen(url) + strlen(host) + strlen(_openttd_revision) + (data == NULL ? 0 : strlen(data)) + 128;
    00046   char *buffer = AllocaM(char, bufferSize);
    00047
    00048   DEBUG(net, 7, "[tcp/http] requesting %s%s", host, url);
    00049   if (data != NULL) {
    00050     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);
    00051   } else {
    00052     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);
    00053   }
    00054
    00055   ssize_t size = strlen(buffer);
    00056   ssize_t res = send(this->sock, (const char*)buffer, size, 0);
    00057   if (res != size) {
    00058     /* Sending all data failed. Socket can't handle this little bit
    00059      * of information? Just fall back to the old system! */
    00060     this->callback->OnFailure();
    00061     delete this;
    00062     return;
    00063   }
    00064
    00065   *_http_connections.Append() = this;
    00066 }
    00067
    00069 NetworkHTTPSocketHandler::~NetworkHTTPSocketHandler()
    00070 {
    00071   this->CloseConnection();
    00072
    00073   if (this->sock != INVALID_SOCKET) closesocket(this->sock);
    00074   this->sock = INVALID_SOCKET;
    00075   free((void*)this->data);
    00076 }
    00077
    00078 NetworkRecvStatus NetworkHTTPSocketHandler::CloseConnection(bool error)
    00079 {
    00080   NetworkSocketHandler::CloseConnection(error);
    00081   return NETWORK_RECV_STATUS_OKAY;
    00082 }
    00083
    00088 #define return_error(msg) { DEBUG(net, 0, msg); return -1; }
    00089
    00090 static const char * const NEWLINE        = "\r\n";
    00091 static const char * const END_OF_HEADER  = "\r\n\r\n";
    00092 static const char * const HTTP_1_0       = "HTTP/1.0 ";
    00093 static const char * const HTTP_1_1       = "HTTP/1.1 ";
    00094 static const char * const CONTENT_LENGTH = "Content-Length: ";
    00095 static const char * const LOCATION       = "Location: ";
    00096
    00107 int NetworkHTTPSocketHandler::HandleHeader()
    00108 {
    00109   assert(strlen(HTTP_1_0) == strlen(HTTP_1_1));
    00110   assert(strstr(this->recv_buffer, END_OF_HEADER) != NULL);
    00111
    00112   /* We expect a HTTP/1.[01] reply */
    00113   if (strncmp(this->recv_buffer, HTTP_1_0, strlen(HTTP_1_0)) != 0 &&
    00114       strncmp(this->recv_buffer, HTTP_1_1, strlen(HTTP_1_1)) != 0) {
    00115     return_error("[tcp/http] received invalid HTTP reply");
    00116   }
    00117
    00118   char *status = this->recv_buffer + strlen(HTTP_1_0);
    00119   if (strncmp(status, "200", 3) == 0) {
    00120     /* We are going to receive a document. */
    00121
    00122     /* Get the length of the document to receive */
    00123     char *length = strcasestr(this->recv_buffer, CONTENT_LENGTH);
    00124     if (length == NULL) return_error("[tcp/http] missing 'content-length' header");
    00125
    00126     /* Skip the header */
    00127     length += strlen(CONTENT_LENGTH);
    00128
    00129     /* Search the end of the line. This is safe because the header will
    00130      * always end with two newlines. */
    00131     char *end_of_line = strstr(length, NEWLINE);
    00132
    00133     /* Read the length */
    00134     *end_of_line = '\0';
    00135     int len = atoi(length);
    00136     /* Restore the header. */
    00137     *end_of_line = '\r';
    00138
    00139     /* Make sure we're going to download at least something;
    00140      * zero sized files are, for OpenTTD's purposes, always
    00141      * wrong. You can't have gzips of 0 bytes! */
    00142     if (len == 0) return_error("[tcp/http] refusing to download 0 bytes");
    00143
    00144     DEBUG(net, 7, "[tcp/http] downloading %i bytes", len);
    00145     return len;
    00146   }
    00147
    00148   if (strncmp(status, "301", 3) != 0 &&
    00149       strncmp(status, "302", 3) != 0 &&
    00150       strncmp(status, "303", 3) != 0 &&
    00151       strncmp(status, "307", 3) != 0) {
    00152     /* We are not going to be redirected :(. */
    00153
    00154     /* Search the end of the line. This is safe because the header will
    00155      * always end with two newlines. */
    00156     *strstr(status, NEWLINE) = '\0';
    00157     DEBUG(net, 0, "[tcp/http] unhandled status reply %s", status);
    00158     return -1;
    00159   }
    00160
    00161   if (this->redirect_depth == 5) return_error("[tcp/http] too many redirects, looping redirects?");
    00162
    00163   /* Redirect to other URL */
    00164   char *uri = strcasestr(this->recv_buffer, LOCATION);
    00165   if (uri == NULL) return_error("[tcp/http] missing 'location' header for redirect");
    00166
    00167   uri += strlen(LOCATION);
    00168
    00169   /* Search the end of the line. This is safe because the header will
    00170    * always end with two newlines. */
    00171   char *end_of_line = strstr(uri, NEWLINE);
    00172   *end_of_line = '\0';
    00173
    00174   DEBUG(net, 6, "[tcp/http] redirecting to %s", uri);
    00175
    00176   int ret = NetworkHTTPSocketHandler::Connect(uri, this->callback, this->data, this->redirect_depth + 1);
    00177   if (ret != 0) return ret;
    00178
    00179   /* We've relinguished control of data now. */
    00180   this->data = NULL;
    00181
    00182   /* Restore the header. */
    00183   *end_of_line = '\r';
    00184   return 0;
    00185 }
    00186
    00194 /* static */ int NetworkHTTPSocketHandler::Connect(char *uri, HTTPCallback *callback, const char *data, int depth)
    00195 {
    00196   char *hname = strstr(uri, "://");
    00197   if (hname == NULL) return_error("[tcp/http] invalid location");
    00198
    00199   hname += 3;
    00200
    00201   char *url = strchr(hname, '/');
    00202   if (url == NULL) return_error("[tcp/http] invalid location");
    00203
    00204   *url = '\0';
    00205
    00206   /* Fetch the hostname, and possible port number. */
    00207   const char *company = NULL;
    00208   const char *port = NULL;
    00209   ParseConnectionString(&company, &port, hname);
    00210   if (company != NULL) return_error("[tcp/http] invalid hostname");
    00211
    00212   NetworkAddress address(hname, port == NULL ? 80 : atoi(port));
    00213
    00214   /* Restore the URL. */
    00215   *url = '/';
    00216   new NetworkHTTPContentConnecter(address, callback, url, data, depth);
    00217   return 0;
    00218 }
    00219
    00220 #undef return_error
    00221
    00229 int NetworkHTTPSocketHandler::Receive()
    00230 {
    00231   for (;;) {
    00232     ssize_t res = recv(this->sock, (char *)this->recv_buffer + this->recv_pos, lengthof(this->recv_buffer) - this->recv_pos, 0);
    00233     if (res == -1) {
    00234       int err = GET_LAST_ERROR();
    00235       if (err != EWOULDBLOCK) {
    00236         /* Something went wrong... (104 is connection reset by peer) */
    00237         if (err != 104) DEBUG(net, 0, "recv failed with error %d", err);
    00238         return -1;
    00239       }
    00240       /* Connection would block, so stop for now */
    00241       return 1;
    00242     }
    00243
    00244     /* No more data... did we get everything we wanted? */
    00245     if (res == 0) {
    00246       if (this->recv_length != 0) return -1;
    00247
    00248       this->callback->OnReceiveData(NULL, 0);
    00249       return 0;
    00250     }
    00251
    00252     /* Wait till we read the end-of-header identifier */
    00253     if (this->recv_length == 0) {
    00254       int read = this->recv_pos + res;
    00255       int end = min(read, lengthof(this->recv_buffer) - 1);
    00256
    00257       /* Do a 'safe' search for the end of the header. */
    00258       char prev = this->recv_buffer[end];
    00259       this->recv_buffer[end] = '\0';
    00260       char *end_of_header = strstr(this->recv_buffer, END_OF_HEADER);
    00261       this->recv_buffer[end] = prev;
    00262
    00263       if (end_of_header == NULL) {
    00264         if (read == lengthof(this->recv_buffer)) {
    00265           DEBUG(net, 0, "[tcp/http] header too big");
    00266           return -1;
    00267         }
    00268         this->recv_pos = read;
    00269       } else {
    00270         int ret = this->HandleHeader();
    00271         if (ret <= 0) return ret;
    00272
    00273         this->recv_length = ret;
    00274
    00275         end_of_header += strlen(END_OF_HEADER);
    00276         int len = min(read - (end_of_header - this->recv_buffer), res);
    00277         if (len != 0) {
    00278           this->callback->OnReceiveData(end_of_header, len);
    00279           this->recv_length -= len;
    00280         }
    00281
    00282         this->recv_pos = 0;
    00283       }
    00284     } else {
    00285       res = min(this->recv_length, res);
    00286       /* Receive whatever we're expecting. */
    00287       this->callback->OnReceiveData(this->recv_buffer, res);
    00288       this->recv_length -= res;
    00289     }
    00290   }
    00291 }
    00292
    00296 /* static */ void NetworkHTTPSocketHandler::HTTPReceive()
    00297 {
    00298   /* No connections, just bail out. */
    00299   if (_http_connections.Length() == 0) return;
    00300
    00301   fd_set read_fd;
    00302   struct timeval tv;
    00303
    00304   FD_ZERO(&read_fd);
    00305   for (NetworkHTTPSocketHandler **iter = _http_connections.Begin(); iter < _http_connections.End(); iter++) {
    00306     FD_SET((*iter)->sock, &read_fd);
    00307   }
    00308
    00309   tv.tv_sec = tv.tv_usec = 0; // don't block at all.
    00310 #if !defined(__MORPHOS__) && !defined(__AMIGA__)
    00311   int n = select(FD_SETSIZE, &read_fd, NULL, NULL, &tv);
    00312 #else
    00313   int n = WaitSelect(FD_SETSIZE, &read_fd, NULL, NULL, &tv, NULL);
    00314 #endif
    00315   if (n == -1) return;
    00316
    00317   for (NetworkHTTPSocketHandler **iter = _http_connections.Begin(); iter < _http_connections.End(); /* nothing */) {
    00318     NetworkHTTPSocketHandler *cur = *iter;
    00319
    00320     if (FD_ISSET(cur->sock, &read_fd)) {
    00321       int ret = cur->Receive();
    00322       /* First send the failure. */
    00323       if (ret < 0) cur->callback->OnFailure();
    00324       if (ret <= 0) {
    00325         /* Then... the connection can be closed */
    00326         cur->CloseConnection();
    00327         _http_connections.Erase(iter);
    00328         delete cur;
    00329         continue;
    00330       }
    00331     }
    00332     iter++;
    00333   }
    00334 }
    00335
    00336 #endif /* ENABLE_NETWORK */