lib/http2.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ***************************************************************************/
  22
  23 #include "curl_setup.h"
  24
  25 #ifdef USE_NGHTTP2
  26 #define _MPRINTF_REPLACE
  27 #include <curl/mprintf.h>
  28
  29 #include <nghttp2/nghttp2.h>
  30 #include "urldata.h"
  31 #include "http2.h"
  32 #include "http.h"
  33 #include "sendf.h"
  34 #include "curl_base64.h"
  35 #include "curl_memory.h"
  36
  37 /* include memdebug.h last */
  38 #include "memdebug.h"
  39
  40 #if (NGHTTP2_VERSION_NUM < 0x000300)
  41 #error too old nghttp2 version, upgrade!
  42 #endif
  43
  44 /*
  45  * HTTP2 handler interface. This isn't added to the general list of protocols
  46  * but will be used at run-time when the protocol is dynamically switched from
  47  * HTTP to HTTP2.
  48  */
  49 const struct Curl_handler Curl_handler_http2 = {
  50   "HTTP2",                              /* scheme */
  51   ZERO_NULL,                            /* setup_connection */
  52   ZERO_NULL,                            /* do_it */
  53   ZERO_NULL     ,                       /* done */
  54   ZERO_NULL,                            /* do_more */
  55   ZERO_NULL,                            /* connect_it */
  56   ZERO_NULL,                            /* connecting */
  57   ZERO_NULL,                            /* doing */
  58   ZERO_NULL,                            /* proto_getsock */
  59   ZERO_NULL,                            /* doing_getsock */
  60   ZERO_NULL,                            /* domore_getsock */
  61   ZERO_NULL,                            /* perform_getsock */
  62   ZERO_NULL,                            /* disconnect */
  63   ZERO_NULL,                            /* readwrite */
  64   PORT_HTTP,                            /* defport */
  65   0,                                    /* protocol */
  66   PROTOPT_NONE                          /* flags */
  67 };
  68
  69
  70 /*
  71  * Store nghttp2 version info in this buffer, Prefix with a space.  Return
  72  * total length written.
  73  */
  74 int Curl_http2_ver(char *p, size_t len)
  75 {
  76   nghttp2_info *h2 = nghttp2_version(0);
  77   return snprintf(p, len, " nghttp2/%s", h2->version_str);
  78 }
  79
  80 /*
  81  * The implementation of nghttp2_send_callback type. Here we write |data| with
  82  * size |length| to the network and return the number of bytes actually
  83  * written. See the documentation of nghttp2_send_callback for the details.
  84  */
  85 static ssize_t send_callback(nghttp2_session *h2,
  86                              const uint8_t *data, size_t length, int flags,
  87                              void *userp)
  88 {
  89   struct connectdata *conn = (struct connectdata *)userp;
  90   ssize_t written;
  91   CURLcode rc =
  92     Curl_write(conn, conn->sock[0], data, length, &written);
  93   (void)h2;
  94   (void)flags;
  95
  96   if(rc) {
  97     failf(conn->data, "Failed sending HTTP2 data");
  98     return NGHTTP2_ERR_CALLBACK_FAILURE;
  99   }
 100   else if(!written)
 101     return NGHTTP2_ERR_WOULDBLOCK;
 102
 103   return written;
 104 }
 105
 106 /*
 107  * The implementation of nghttp2_recv_callback type. Here we read data from
 108  * the network and write them in |buf|. The capacity of |buf| is |length|
 109  * bytes. Returns the number of bytes stored in |buf|. See the documentation
 110  * of nghttp2_recv_callback for the details.
 111  */
 112 static ssize_t recv_callback(nghttp2_session *h2,
 113                              uint8_t *buf, size_t length, int flags,
 114                              void *userp)
 115 {
 116   struct connectdata *conn = (struct connectdata *)userp;
 117   ssize_t nread;
 118   CURLcode rc = Curl_read_plain(conn->sock[FIRSTSOCKET], (char *)buf, length,
 119                                 &nread);
 120   (void)h2;
 121   (void)flags;
 122
 123   if(rc) {
 124     failf(conn->data, "Failed receiving HTTP2 data");
 125     return NGHTTP2_ERR_CALLBACK_FAILURE;
 126   }
 127   if(!nread)
 128     return NGHTTP2_ERR_WOULDBLOCK;
 129
 130   return nread;
 131 }
 132
 133 /*
 134  * This is all callbacks nghttp2 calls
 135  */
 136 static const nghttp2_session_callbacks callbacks = {
 137   send_callback,
 138   recv_callback,
 139   NULL,
 140   NULL,
 141   NULL,
 142   NULL,
 143   NULL,
 144   NULL,
 145   NULL,
 146   NULL,
 147   NULL,
 148   NULL
 149 };
 150
 151 /*
 152  * The HTTP2 settings we send in the Upgrade request
 153  */
 154 static nghttp2_settings_entry settings[] = {
 155   { NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100 },
 156   { NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, NGHTTP2_INITIAL_WINDOW_SIZE },
 157 };
 158
 159 /*
 160  * Append headers to ask for a HTTP1.1 to HTTP2 upgrade.
 161  */
 162 CURLcode Curl_http2_request(Curl_send_buffer *req,
 163                             struct connectdata *conn)
 164 {
 165   uint8_t binsettings[80];
 166   CURLcode result;
 167   ssize_t binlen;
 168   char *base64;
 169   size_t blen;
 170   struct SingleRequest *k = &conn->data->req;
 171
 172   if(!conn->proto.httpc.h2) {
 173     /* The nghttp2 session is not yet setup, do it */
 174     int rc = nghttp2_session_client_new(&conn->proto.httpc.h2,
 175                                         &callbacks, conn);
 176     if(rc) {
 177       failf(conn->data, "Couldn't initialize nghttp2!");
 178       return CURLE_OUT_OF_MEMORY; /* most likely at least */
 179     }
 180   }
 181
 182   /* As long as we have a fixed set of settings, we don't have to dynamically
 183    * figure out the base64 strings since it'll always be the same. However,
 184    * the settings will likely not be fixed every time in the future.
 185    */
 186
 187   /* this returns number of bytes it wrote */
 188   binlen = nghttp2_pack_settings_payload(binsettings,
 189                                          sizeof(binsettings),
 190                                          settings,
 191                                          sizeof(settings)/sizeof(settings[0]));
 192   if(!binlen) {
 193     failf(conn->data, "nghttp2 unexpectedly failed on pack_settings_payload");
 194     return CURLE_FAILED_INIT;
 195   }
 196
 197   result = Curl_base64_encode(conn->data, (const char *)binsettings, binlen,
 198                               &base64, &blen);
 199   if(result)
 200     return result;
 201
 202   result = Curl_add_bufferf(req,
 203                             "Connection: Upgrade, HTTP2-Settings\r\n"
 204                             "Upgrade: %s\r\n"
 205                             "HTTP2-Settings: %s\r\n",
 206                             NGHTTP2_PROTO_VERSION_ID, base64);
 207   free(base64);
 208
 209   k->upgr101 = UPGR101_REQUESTED;
 210
 211   return result;
 212 }
 213
 214 /*
 215  * If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
 216  * a regular CURLcode value.
 217  */
 218 static ssize_t http2_recv(struct connectdata *conn, int sockindex,
 219                           char *mem, size_t len, CURLcode *err)
 220 {
 221   int rc;
 222   (void)sockindex; /* we always do HTTP2 on sockindex 0 */
 223
 224   conn->proto.httpc.mem = mem;
 225   conn->proto.httpc.size = len;
 226
 227   rc = nghttp2_session_recv(conn->proto.httpc.h2);
 228
 229   if(rc < 0) {
 230     *err = CURLE_RECV_ERROR;
 231   }
 232   return 0;
 233 }
 234
 235 /* return number of received (decrypted) bytes */
 236 static ssize_t http2_send(struct connectdata *conn, int sockindex,
 237                           const void *mem, size_t len, CURLcode *err)
 238 {
 239   /* TODO: proper implementation */
 240   (void)conn;
 241   (void)sockindex;
 242   (void)mem;
 243   (void)len;
 244   (void)err;
 245   return 0;
 246 }
 247
 248 void Curl_http2_switched(struct connectdata *conn)
 249 {
 250   /* we are switched! */
 251   conn->handler = &Curl_handler_http2;
 252   conn->recv[FIRSTSOCKET] = http2_recv;
 253   conn->send[FIRSTSOCKET] = http2_send;
 254   infof(conn->data, "We have switched to HTTP2\n");
 255 }
 256
 257 #endif