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-rw-r--r--src/core/lib/http/parser.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/src/core/lib/http/parser.c b/src/core/lib/http/parser.c
new file mode 100644
index 0000000000..5d4e304615
--- /dev/null
+++ b/src/core/lib/http/parser.c
@@ -0,0 +1,313 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/lib/http/parser.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/useful.h>
+
+static char *buf2str(void *buffer, size_t length) {
+ char *out = gpr_malloc(length + 1);
+ memcpy(out, buffer, length);
+ out[length] = 0;
+ return out;
+}
+
+static int handle_response_line(grpc_http_parser *parser) {
+ uint8_t *beg = parser->cur_line;
+ uint8_t *cur = beg;
+ uint8_t *end = beg + parser->cur_line_length;
+
+ if (cur == end || *cur++ != 'H') goto error;
+ if (cur == end || *cur++ != 'T') goto error;
+ if (cur == end || *cur++ != 'T') goto error;
+ if (cur == end || *cur++ != 'P') goto error;
+ if (cur == end || *cur++ != '/') goto error;
+ if (cur == end || *cur++ != '1') goto error;
+ if (cur == end || *cur++ != '.') goto error;
+ if (cur == end || *cur < '0' || *cur++ > '1') goto error;
+ if (cur == end || *cur++ != ' ') goto error;
+ if (cur == end || *cur < '1' || *cur++ > '9') goto error;
+ if (cur == end || *cur < '0' || *cur++ > '9') goto error;
+ if (cur == end || *cur < '0' || *cur++ > '9') goto error;
+ parser->http.response.status =
+ (cur[-3] - '0') * 100 + (cur[-2] - '0') * 10 + (cur[-1] - '0');
+ if (cur == end || *cur++ != ' ') goto error;
+
+ /* we don't really care about the status code message */
+
+ return 1;
+
+error:
+ gpr_log(GPR_ERROR, "Failed parsing response line");
+ return 0;
+}
+
+static int handle_request_line(grpc_http_parser *parser) {
+ uint8_t *beg = parser->cur_line;
+ uint8_t *cur = beg;
+ uint8_t *end = beg + parser->cur_line_length;
+ uint8_t vers_major = 0;
+ uint8_t vers_minor = 0;
+
+ while (cur != end && *cur++ != ' ')
+ ;
+ if (cur == end) goto error;
+ parser->http.request.method = buf2str(beg, (size_t)(cur - beg - 1));
+
+ beg = cur;
+ while (cur != end && *cur++ != ' ')
+ ;
+ if (cur == end) goto error;
+ parser->http.request.path = buf2str(beg, (size_t)(cur - beg - 1));
+
+ if (cur == end || *cur++ != 'H') goto error;
+ if (cur == end || *cur++ != 'T') goto error;
+ if (cur == end || *cur++ != 'T') goto error;
+ if (cur == end || *cur++ != 'P') goto error;
+ if (cur == end || *cur++ != '/') goto error;
+ vers_major = (uint8_t)(*cur++ - '1' + 1);
+ ++cur;
+ if (cur == end) goto error;
+ vers_minor = (uint8_t)(*cur++ - '1' + 1);
+
+ if (vers_major == 1) {
+ if (vers_minor == 0) {
+ parser->http.request.version = GRPC_HTTP_HTTP10;
+ } else if (vers_minor == 1) {
+ parser->http.request.version = GRPC_HTTP_HTTP11;
+ } else {
+ goto error;
+ }
+ } else if (vers_major == 2) {
+ if (vers_minor == 0) {
+ parser->http.request.version = GRPC_HTTP_HTTP20;
+ } else {
+ goto error;
+ }
+ } else {
+ goto error;
+ }
+
+ return 1;
+
+error:
+ gpr_log(GPR_ERROR, "Failed parsing request line");
+ return 0;
+}
+
+static int handle_first_line(grpc_http_parser *parser) {
+ if (parser->cur_line[0] == 'H') {
+ parser->type = GRPC_HTTP_RESPONSE;
+ return handle_response_line(parser);
+ } else {
+ parser->type = GRPC_HTTP_REQUEST;
+ return handle_request_line(parser);
+ }
+}
+
+static int add_header(grpc_http_parser *parser) {
+ uint8_t *beg = parser->cur_line;
+ uint8_t *cur = beg;
+ uint8_t *end = beg + parser->cur_line_length;
+ size_t *hdr_count = NULL;
+ grpc_http_header **hdrs = NULL;
+ grpc_http_header hdr = {NULL, NULL};
+
+ GPR_ASSERT(cur != end);
+
+ if (*cur == ' ' || *cur == '\t') {
+ gpr_log(GPR_ERROR, "Continued header lines not supported yet");
+ goto error;
+ }
+
+ while (cur != end && *cur != ':') {
+ cur++;
+ }
+ if (cur == end) {
+ gpr_log(GPR_ERROR, "Didn't find ':' in header string");
+ goto error;
+ }
+ GPR_ASSERT(cur >= beg);
+ hdr.key = buf2str(beg, (size_t)(cur - beg));
+ cur++; /* skip : */
+
+ while (cur != end && (*cur == ' ' || *cur == '\t')) {
+ cur++;
+ }
+ GPR_ASSERT(end - cur >= 2);
+ hdr.value = buf2str(cur, (size_t)(end - cur) - 2);
+
+ if (parser->type == GRPC_HTTP_RESPONSE) {
+ hdr_count = &parser->http.response.hdr_count;
+ hdrs = &parser->http.response.hdrs;
+ } else if (parser->type == GRPC_HTTP_REQUEST) {
+ hdr_count = &parser->http.request.hdr_count;
+ hdrs = &parser->http.request.hdrs;
+ } else {
+ return 0;
+ }
+
+ if (*hdr_count == parser->hdr_capacity) {
+ parser->hdr_capacity =
+ GPR_MAX(parser->hdr_capacity + 1, parser->hdr_capacity * 3 / 2);
+ *hdrs = gpr_realloc(*hdrs, parser->hdr_capacity * sizeof(**hdrs));
+ }
+ (*hdrs)[(*hdr_count)++] = hdr;
+ return 1;
+
+error:
+ gpr_free(hdr.key);
+ gpr_free(hdr.value);
+ return 0;
+}
+
+static int finish_line(grpc_http_parser *parser) {
+ switch (parser->state) {
+ case GRPC_HTTP_FIRST_LINE:
+ if (!handle_first_line(parser)) {
+ return 0;
+ }
+ parser->state = GRPC_HTTP_HEADERS;
+ break;
+ case GRPC_HTTP_HEADERS:
+ if (parser->cur_line_length == 2) {
+ parser->state = GRPC_HTTP_BODY;
+ break;
+ }
+ if (!add_header(parser)) {
+ return 0;
+ }
+ break;
+ case GRPC_HTTP_BODY:
+ GPR_UNREACHABLE_CODE(return 0);
+ }
+
+ parser->cur_line_length = 0;
+ return 1;
+}
+
+static int addbyte_body(grpc_http_parser *parser, uint8_t byte) {
+ size_t *body_length = NULL;
+ char **body = NULL;
+
+ if (parser->type == GRPC_HTTP_RESPONSE) {
+ body_length = &parser->http.response.body_length;
+ body = &parser->http.response.body;
+ } else if (parser->type == GRPC_HTTP_REQUEST) {
+ body_length = &parser->http.request.body_length;
+ body = &parser->http.request.body;
+ } else {
+ return 0;
+ }
+
+ if (*body_length == parser->body_capacity) {
+ parser->body_capacity = GPR_MAX(8, parser->body_capacity * 3 / 2);
+ *body = gpr_realloc((void *)*body, parser->body_capacity);
+ }
+ (*body)[*body_length] = (char)byte;
+ (*body_length)++;
+
+ return 1;
+}
+
+static int addbyte(grpc_http_parser *parser, uint8_t byte) {
+ switch (parser->state) {
+ case GRPC_HTTP_FIRST_LINE:
+ case GRPC_HTTP_HEADERS:
+ if (parser->cur_line_length >= GRPC_HTTP_PARSER_MAX_HEADER_LENGTH) {
+ gpr_log(GPR_ERROR, "HTTP client max line length (%d) exceeded",
+ GRPC_HTTP_PARSER_MAX_HEADER_LENGTH);
+ return 0;
+ }
+ parser->cur_line[parser->cur_line_length] = byte;
+ parser->cur_line_length++;
+ if (parser->cur_line_length >= 2 &&
+ parser->cur_line[parser->cur_line_length - 2] == '\r' &&
+ parser->cur_line[parser->cur_line_length - 1] == '\n') {
+ return finish_line(parser);
+ } else {
+ return 1;
+ }
+ GPR_UNREACHABLE_CODE(return 0);
+ case GRPC_HTTP_BODY:
+ return addbyte_body(parser, byte);
+ }
+ GPR_UNREACHABLE_CODE(return 0);
+}
+
+void grpc_http_parser_init(grpc_http_parser *parser) {
+ memset(parser, 0, sizeof(*parser));
+ parser->state = GRPC_HTTP_FIRST_LINE;
+ parser->type = GRPC_HTTP_UNKNOWN;
+}
+
+void grpc_http_parser_destroy(grpc_http_parser *parser) {
+ size_t i;
+ if (parser->type == GRPC_HTTP_RESPONSE) {
+ gpr_free(parser->http.response.body);
+ for (i = 0; i < parser->http.response.hdr_count; i++) {
+ gpr_free(parser->http.response.hdrs[i].key);
+ gpr_free(parser->http.response.hdrs[i].value);
+ }
+ gpr_free(parser->http.response.hdrs);
+ } else if (parser->type == GRPC_HTTP_REQUEST) {
+ gpr_free(parser->http.request.body);
+ for (i = 0; i < parser->http.request.hdr_count; i++) {
+ gpr_free(parser->http.request.hdrs[i].key);
+ gpr_free(parser->http.request.hdrs[i].value);
+ }
+ gpr_free(parser->http.request.hdrs);
+ gpr_free(parser->http.request.method);
+ gpr_free(parser->http.request.path);
+ }
+}
+
+int grpc_http_parser_parse(grpc_http_parser *parser, gpr_slice slice) {
+ size_t i;
+
+ for (i = 0; i < GPR_SLICE_LENGTH(slice); i++) {
+ if (!addbyte(parser, GPR_SLICE_START_PTR(slice)[i])) {
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+int grpc_http_parser_eof(grpc_http_parser *parser) {
+ return parser->state == GRPC_HTTP_BODY;
+}
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