Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2014, Google Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include "src/core/channel/http_server_filter.h" |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 35 | |
| 36 | #include <string.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 37 | #include <grpc/support/log.h> |
| 38 | |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 39 | typedef struct call_data { |
| 40 | int sent_status; |
| 41 | int seen_scheme; |
| 42 | int seen_method; |
| 43 | int seen_te_trailers; |
| 44 | } call_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 45 | |
klempner | 1e27328 | 2014-12-10 13:55:41 -0800 | [diff] [blame] | 46 | typedef struct channel_data { |
| 47 | grpc_mdelem *te_trailers; |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 48 | grpc_mdelem *method; |
| 49 | grpc_mdelem *http_scheme; |
| 50 | grpc_mdelem *https_scheme; |
| 51 | /* TODO(klempner): Remove this once we stop using it */ |
| 52 | grpc_mdelem *grpc_scheme; |
| 53 | grpc_mdelem *content_type; |
| 54 | grpc_mdelem *status; |
klempner | 1e27328 | 2014-12-10 13:55:41 -0800 | [diff] [blame] | 55 | } channel_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 56 | |
| 57 | /* used to silence 'variable not used' warnings */ |
| 58 | static void ignore_unused(void *ignored) {} |
| 59 | |
| 60 | /* Called either: |
| 61 | - in response to an API call (or similar) from above, to send something |
| 62 | - a network event (or similar) from below, to receive something |
| 63 | op contains type and call direction information, in addition to the data |
| 64 | that is being sent or received. */ |
ctiller | f962f52 | 2014-12-10 15:28:27 -0800 | [diff] [blame] | 65 | static void call_op(grpc_call_element *elem, grpc_call_element *from_elem, |
| 66 | grpc_call_op *op) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 67 | /* grab pointers to our data from the call element */ |
| 68 | call_data *calld = elem->call_data; |
| 69 | channel_data *channeld = elem->channel_data; |
| 70 | GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
| 71 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 72 | switch (op->type) { |
| 73 | case GRPC_RECV_METADATA: |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 74 | /* Check if it is one of the headers we care about. */ |
| 75 | if (op->data.metadata == channeld->te_trailers || |
| 76 | op->data.metadata == channeld->method || |
| 77 | op->data.metadata == channeld->http_scheme || |
| 78 | op->data.metadata == channeld->https_scheme || |
| 79 | op->data.metadata == channeld->grpc_scheme || |
| 80 | op->data.metadata == channeld->content_type) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 81 | /* swallow it */ |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 82 | if (op->data.metadata == channeld->method) { |
| 83 | calld->seen_method = 1; |
| 84 | } else if (op->data.metadata->key == channeld->http_scheme->key) { |
| 85 | calld->seen_scheme = 1; |
| 86 | } else if (op->data.metadata == channeld->te_trailers) { |
| 87 | calld->seen_te_trailers = 1; |
| 88 | } |
| 89 | /* TODO(klempner): Track that we've seen all the headers we should |
| 90 | require */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 91 | grpc_mdelem_unref(op->data.metadata); |
| 92 | op->done_cb(op->user_data, GRPC_OP_OK); |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 93 | } else if (op->data.metadata->key == channeld->content_type->key) { |
| 94 | if (strncmp(grpc_mdstr_as_c_string(op->data.metadata->value), |
| 95 | "application/grpc+", 17) == 0) { |
| 96 | /* Although the C implementation doesn't (currently) generate them, |
| 97 | any |
| 98 | custom +-suffix is explicitly valid. */ |
| 99 | /* TODO(klempner): We should consider preallocating common values such |
| 100 | as +proto or +json, or at least stashing them if we see them. */ |
| 101 | /* TODO(klempner): Should we be surfacing this to application code? */ |
| 102 | } else { |
| 103 | /* TODO(klempner): We're currently allowing this, but we shouldn't |
| 104 | see it without a proxy so log for now. */ |
| 105 | gpr_log(GPR_INFO, "Unexpected content-type %s", |
| 106 | channeld->content_type->key); |
| 107 | } |
| 108 | grpc_mdelem_unref(op->data.metadata); |
| 109 | op->done_cb(op->user_data, GRPC_OP_OK); |
| 110 | } else if (op->data.metadata->key == channeld->te_trailers->key || |
| 111 | op->data.metadata->key == channeld->method->key || |
| 112 | op->data.metadata->key == channeld->http_scheme->key || |
| 113 | op->data.metadata->key == channeld->content_type->key) { |
| 114 | gpr_log(GPR_ERROR, "Invalid %s: header: '%s'", |
| 115 | grpc_mdstr_as_c_string(op->data.metadata->key), |
ctiller | 03dc30e | 2014-12-01 17:13:04 -0800 | [diff] [blame] | 116 | grpc_mdstr_as_c_string(op->data.metadata->value)); |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 117 | /* swallow it and error everything out. */ |
| 118 | /* TODO(klempner): We ought to generate more descriptive error messages |
| 119 | on the wire here. */ |
ctiller | 03dc30e | 2014-12-01 17:13:04 -0800 | [diff] [blame] | 120 | grpc_mdelem_unref(op->data.metadata); |
| 121 | op->done_cb(op->user_data, GRPC_OP_OK); |
| 122 | grpc_call_element_send_cancel(elem); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 123 | } else { |
| 124 | /* pass the event up */ |
| 125 | grpc_call_next_op(elem, op); |
| 126 | } |
| 127 | break; |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 128 | case GRPC_RECV_END_OF_INITIAL_METADATA: |
| 129 | /* Have we seen the required http2 transport headers? |
| 130 | (:method, :scheme, content-type, with :path and :authority covered |
| 131 | at the channel level right now) */ |
| 132 | if (calld->seen_method && calld->seen_scheme && calld->seen_te_trailers) { |
| 133 | grpc_call_next_op(elem, op); |
| 134 | } else { |
| 135 | if (!calld->seen_method) { |
| 136 | gpr_log(GPR_ERROR, "Missing :method header"); |
| 137 | } else if (!calld->seen_scheme) { |
| 138 | gpr_log(GPR_ERROR, "Missing :scheme header"); |
| 139 | } else if (!calld->seen_te_trailers) { |
| 140 | gpr_log(GPR_ERROR, "Missing te trailers header"); |
| 141 | } |
| 142 | /* Error this call out */ |
| 143 | op->done_cb(op->user_data, GRPC_OP_OK); |
| 144 | grpc_call_element_send_cancel(elem); |
| 145 | } |
| 146 | break; |
klempner | 1e27328 | 2014-12-10 13:55:41 -0800 | [diff] [blame] | 147 | case GRPC_SEND_START: |
| 148 | case GRPC_SEND_METADATA: |
| 149 | /* If we haven't sent status 200 yet, we need to so so because it needs to |
| 150 | come before any non : prefixed metadata. */ |
| 151 | if (!calld->sent_status) { |
| 152 | calld->sent_status = 1; |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 153 | /* status is reffed by grpc_call_element_send_metadata */ |
| 154 | grpc_call_element_send_metadata(elem, channeld->status); |
klempner | 1e27328 | 2014-12-10 13:55:41 -0800 | [diff] [blame] | 155 | } |
| 156 | grpc_call_next_op(elem, op); |
| 157 | break; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 158 | default: |
| 159 | /* pass control up or down the stack depending on op->dir */ |
| 160 | grpc_call_next_op(elem, op); |
| 161 | break; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | /* Called on special channel events, such as disconnection or new incoming |
| 166 | calls on the server */ |
ctiller | f962f52 | 2014-12-10 15:28:27 -0800 | [diff] [blame] | 167 | static void channel_op(grpc_channel_element *elem, |
| 168 | grpc_channel_element *from_elem, grpc_channel_op *op) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 169 | /* grab pointers to our data from the channel element */ |
| 170 | channel_data *channeld = elem->channel_data; |
| 171 | |
| 172 | ignore_unused(channeld); |
| 173 | |
| 174 | switch (op->type) { |
| 175 | default: |
| 176 | /* pass control up or down the stack depending on op->dir */ |
| 177 | grpc_channel_next_op(elem, op); |
| 178 | break; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | /* Constructor for call_data */ |
| 183 | static void init_call_elem(grpc_call_element *elem, |
| 184 | const void *server_transport_data) { |
| 185 | /* grab pointers to our data from the call element */ |
| 186 | call_data *calld = elem->call_data; |
| 187 | channel_data *channeld = elem->channel_data; |
| 188 | |
| 189 | ignore_unused(channeld); |
| 190 | |
| 191 | /* initialize members */ |
klempner | 1e27328 | 2014-12-10 13:55:41 -0800 | [diff] [blame] | 192 | calld->sent_status = 0; |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 193 | calld->seen_scheme = 0; |
| 194 | calld->seen_method = 0; |
| 195 | calld->seen_te_trailers = 0; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | /* Destructor for call_data */ |
| 199 | static void destroy_call_elem(grpc_call_element *elem) { |
| 200 | /* grab pointers to our data from the call element */ |
| 201 | call_data *calld = elem->call_data; |
| 202 | channel_data *channeld = elem->channel_data; |
| 203 | |
| 204 | ignore_unused(calld); |
| 205 | ignore_unused(channeld); |
| 206 | } |
| 207 | |
| 208 | /* Constructor for channel_data */ |
| 209 | static void init_channel_elem(grpc_channel_element *elem, |
| 210 | const grpc_channel_args *args, grpc_mdctx *mdctx, |
| 211 | int is_first, int is_last) { |
| 212 | /* grab pointers to our data from the channel element */ |
| 213 | channel_data *channeld = elem->channel_data; |
| 214 | |
| 215 | /* The first and the last filters tend to be implemented differently to |
| 216 | handle the case that there's no 'next' filter to call on the up or down |
| 217 | path */ |
| 218 | GPR_ASSERT(!is_first); |
| 219 | GPR_ASSERT(!is_last); |
| 220 | |
| 221 | /* initialize members */ |
| 222 | channeld->te_trailers = grpc_mdelem_from_strings(mdctx, "te", "trailers"); |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 223 | channeld->status = grpc_mdelem_from_strings(mdctx, ":status", "200"); |
| 224 | channeld->method = grpc_mdelem_from_strings(mdctx, ":method", "POST"); |
| 225 | channeld->http_scheme = grpc_mdelem_from_strings(mdctx, ":scheme", "http"); |
| 226 | channeld->https_scheme = grpc_mdelem_from_strings(mdctx, ":scheme", "https"); |
| 227 | channeld->grpc_scheme = grpc_mdelem_from_strings(mdctx, ":scheme", "grpc"); |
| 228 | channeld->content_type = |
| 229 | grpc_mdelem_from_strings(mdctx, "content-type", "application/grpc"); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | /* Destructor for channel data */ |
| 233 | static void destroy_channel_elem(grpc_channel_element *elem) { |
| 234 | /* grab pointers to our data from the channel element */ |
| 235 | channel_data *channeld = elem->channel_data; |
| 236 | |
| 237 | grpc_mdelem_unref(channeld->te_trailers); |
ctiller | d74729d | 2015-01-12 13:31:36 -0800 | [diff] [blame^] | 238 | grpc_mdelem_unref(channeld->status); |
| 239 | grpc_mdelem_unref(channeld->method); |
| 240 | grpc_mdelem_unref(channeld->http_scheme); |
| 241 | grpc_mdelem_unref(channeld->https_scheme); |
| 242 | grpc_mdelem_unref(channeld->grpc_scheme); |
| 243 | grpc_mdelem_unref(channeld->content_type); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | const grpc_channel_filter grpc_http_server_filter = { |
| 247 | call_op, channel_op, |
| 248 | |
| 249 | sizeof(call_data), init_call_elem, destroy_call_elem, |
| 250 | |
| 251 | sizeof(channel_data), init_channel_elem, destroy_channel_elem, |
| 252 | |
| 253 | "http-server"}; |