lib/http2.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2013, 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 /*
  41  * HTTP2 handler interface. This isn't added to the general list of protocols
  42  * but will be used at run-time when the protocol is dynamically switched from
  43  * HTTP to HTTP2.
  44  */
  45 const struct Curl_handler Curl_handler_http2 = {
  46   "HTTP2",                              /* scheme */
  47   ZERO_NULL,                            /* setup_connection */
  48   ZERO_NULL,                            /* do_it */
  49   ZERO_NULL     ,                       /* done */
  50   ZERO_NULL,                            /* do_more */
  51   ZERO_NULL,                            /* connect_it */
  52   ZERO_NULL,                            /* connecting */
  53   ZERO_NULL,                            /* doing */
  54   ZERO_NULL,                            /* proto_getsock */
  55   ZERO_NULL,                            /* doing_getsock */
  56   ZERO_NULL,                            /* domore_getsock */
  57   ZERO_NULL,                            /* perform_getsock */
  58   ZERO_NULL,                            /* disconnect */
  59   ZERO_NULL,                            /* readwrite */
  60   PORT_HTTP,                            /* defport */
  61   0,                                    /* protocol */
  62   PROTOPT_NONE                          /* flags */
  63 };
  64
  65
  66 /*
  67  * Store nghttp2 version info in this buffer, Prefix with a space.  Return
  68  * total length written.
  69  */
  70 int Curl_http2_ver(char *p, size_t len)
  71 {
  72   nghttp2_info *h2 = nghttp2_version(0);
  73   return snprintf(p, len, " nghttp2/%s", h2->version_str);
  74 }
  75
  76 /*
  77  * The implementation of nghttp2_send_callback type. Here we write |data| with
  78  * size |length| to the network and return the number of bytes actually
  79  * written. See the documentation of nghttp2_send_callback for the details.
  80  */
  81 static ssize_t send_callback(nghttp2_session *h2,
  82                              const uint8_t *data, size_t length, int flags,
  83                              void *userp)
  84 {
  85   struct connectdata *conn = (struct connectdata *)userp;
  86   ssize_t written;
  87   CURLcode rc =
  88     Curl_write(conn, conn->sock[0], data, length, &written);
  89   (void)h2;
  90   (void)flags;
  91
  92   if(rc) {
  93     failf(conn->data, "Failed sending HTTP2 data");
  94     return NGHTTP2_ERR_CALLBACK_FAILURE;
  95   }
  96   else if(!written)
  97     return NGHTTP2_ERR_WOULDBLOCK;
  98
  99   return written;
 100 }
 101
 102 /*
 103  * The implementation of nghttp2_recv_callback type. Here we read data from
 104  * the network and write them in |buf|. The capacity of |buf| is |length|
 105  * bytes. Returns the number of bytes stored in |buf|. See the documentation
 106  * of nghttp2_recv_callback for the details.
 107  */
 108 static ssize_t recv_callback(nghttp2_session *h2,
 109                              uint8_t *buf, size_t length, int flags,
 110                              void *userp)
 111 {
 112   struct connectdata *conn = (struct connectdata *)userp;
 113   ssize_t nread;
 114   CURLcode rc = Curl_read(conn, conn->sock[0], (char *)buf, length, &nread);
 115   (void)h2;
 116   (void)flags;
 117
 118   if(rc) {
 119     failf(conn->data, "Failed recving HTTP2 data");
 120     return NGHTTP2_ERR_CALLBACK_FAILURE;
 121   }
 122   if(!nread)
 123     return NGHTTP2_ERR_WOULDBLOCK;
 124
 125   return nread;
 126 }
 127
 128 /*
 129  * This is all callbacks nghttp2 calls
 130  */
 131 static const nghttp2_session_callbacks callbacks = {
 132   send_callback,
 133   recv_callback,
 134   NULL,
 135   NULL,
 136   NULL,
 137   NULL,
 138   NULL,
 139   NULL,
 140   NULL,
 141   NULL,
 142   NULL,
 143   NULL,
 144   NULL,
 145   NULL
 146 };
 147
 148 /*
 149  * The HTTP2 settings we send in the Upgrade request
 150  */
 151 static nghttp2_settings_entry settings[] = {
 152   { NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100 },
 153   { NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, NGHTTP2_INITIAL_WINDOW_SIZE },
 154 };
 155
 156 /*
 157  * Append headers to ask for a HTTP1.1 to HTTP2 upgrade.
 158  */
 159 CURLcode Curl_http2_request(Curl_send_buffer *req,
 160                             struct connectdata *conn)
 161 {
 162   uint8_t binsettings[80];
 163   CURLcode result;
 164   ssize_t binlen;
 165   char *base64;
 166   size_t blen;
 167   struct SingleRequest *k = &conn->data->req;
 168
 169   if(!conn->proto.httpc.h2) {
 170     /* The nghttp2 session is not yet setup, do it */
 171     int rc = nghttp2_session_client_new(&conn->proto.httpc.h2,
 172                                         &callbacks, &conn);
 173     if(rc) {
 174       failf(conn->data, "Couldn't initialize nghttp2!");
 175       return CURLE_OUT_OF_MEMORY; /* most likely at least */
 176     }
 177   }
 178
 179   /* As long as we have a fixed set of settings, we don't have to dynamically
 180    * figure out the base64 strings since it'll always be the same. However,
 181    * the settings will likely not be fixed every time in the future.
 182    */
 183
 184   /* this returns number of bytes it wrote */
 185   binlen = nghttp2_pack_settings_payload(binsettings,
 186                                          sizeof(binsettings),
 187                                          settings,
 188                                          sizeof(settings)/sizeof(settings[0]));
 189   if(!binlen) {
 190     failf(conn->data, "nghttp2 unexpectedly failed on pack_settings_payload");
 191     return CURLE_FAILED_INIT;
 192   }
 193
 194   result = Curl_base64_encode(conn->data, (const char *)binsettings, binlen,
 195                               &base64, &blen);
 196   if(result)
 197     return result;
 198
 199   result = Curl_add_bufferf(req,
 200                             "Connection: Upgrade, HTTP2-Settings\r\n"
 201                             "Upgrade: %s\r\n"
 202                             "HTTP2-Settings: %s\r\n",
 203                             NGHTTP2_PROTO_VERSION_ID, base64);
 204   free(base64);
 205
 206   k->upgr101 = UPGR101_REQUESTED;
 207
 208   return result;
 209 }
 210
 211 void Curl_http2_switched(struct connectdata *conn)
 212 {
 213   /* we are switched! */
 214   conn->handler = &Curl_handler_http2;
 215   infof(conn->data, "We have switched to HTTP2\n");
 216 }
 217
 218 #endif