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-rw-r--r--src/core/ext/client_config/uri_parser.c310
1 files changed, 310 insertions, 0 deletions
diff --git a/src/core/ext/client_config/uri_parser.c b/src/core/ext/client_config/uri_parser.c
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+++ b/src/core/ext/client_config/uri_parser.c
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+/*
+ *
+ * Copyright 2015, 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/ext/client_config/uri_parser.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/port_platform.h>
+#include <grpc/support/slice.h>
+#include <grpc/support/slice_buffer.h>
+#include <grpc/support/string_util.h>
+
+#include "src/core/lib/support/string.h"
+
+/** a size_t default value... maps to all 1's */
+#define NOT_SET (~(size_t)0)
+
+static grpc_uri *bad_uri(const char *uri_text, size_t pos, const char *section,
+ int suppress_errors) {
+ char *line_prefix;
+ size_t pfx_len;
+
+ if (!suppress_errors) {
+ gpr_asprintf(&line_prefix, "bad uri.%s: '", section);
+ pfx_len = strlen(line_prefix) + pos;
+ gpr_log(GPR_ERROR, "%s%s'", line_prefix, uri_text);
+ gpr_free(line_prefix);
+
+ line_prefix = gpr_malloc(pfx_len + 1);
+ memset(line_prefix, ' ', pfx_len);
+ line_prefix[pfx_len] = 0;
+ gpr_log(GPR_ERROR, "%s^ here", line_prefix);
+ gpr_free(line_prefix);
+ }
+
+ return NULL;
+}
+
+/** Returns a copy of \a src[begin, end) */
+static char *copy_component(const char *src, size_t begin, size_t end) {
+ char *out = gpr_malloc(end - begin + 1);
+ memcpy(out, src + begin, end - begin);
+ out[end - begin] = 0;
+ return out;
+}
+
+/** Returns how many chars to advance if \a uri_text[i] begins a valid \a pchar
+ * production. If \a uri_text[i] introduces an invalid \a pchar (such as percent
+ * sign not followed by two hex digits), NOT_SET is returned. */
+static size_t parse_pchar(const char *uri_text, size_t i) {
+ /* pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
+ * unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
+ * pct-encoded = "%" HEXDIG HEXDIG
+ * sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
+ / "*" / "+" / "," / ";" / "=" */
+ char c = uri_text[i];
+ if (((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z')) ||
+ ((c >= '0') && (c <= '9')) ||
+ (c == '-' || c == '.' || c == '_' || c == '~') || /* unreserved */
+ (c == '!' || c == '$' || c == '&' || c == '\'' || c == '$' || c == '&' ||
+ c == '(' || c == ')' || c == '*' || c == '+' || c == ',' || c == ';' ||
+ c == '=') /* sub-delims */) {
+ return 1;
+ }
+ if (c == '%') { /* pct-encoded */
+ size_t j;
+ if (uri_text[i + 1] == 0 || uri_text[i + 2] == 0) {
+ return NOT_SET;
+ }
+ for (j = i + 1; j < 2; j++) {
+ c = uri_text[j];
+ if (!(((c >= '0') && (c <= '9')) || ((c >= 'a') && (c <= 'f')) ||
+ ((c >= 'A') && (c <= 'F')))) {
+ return NOT_SET;
+ }
+ }
+ return 2;
+ }
+ return 0;
+}
+
+/* *( pchar / "?" / "/" ) */
+static int parse_fragment_or_query(const char *uri_text, size_t *i) {
+ char c;
+ while ((c = uri_text[*i]) != 0) {
+ const size_t advance = parse_pchar(uri_text, *i); /* pchar */
+ switch (advance) {
+ case 0: /* uri_text[i] isn't in pchar */
+ /* maybe it's ? or / */
+ if (uri_text[*i] == '?' || uri_text[*i] == '/') {
+ (*i)++;
+ break;
+ } else {
+ return 1;
+ }
+ GPR_UNREACHABLE_CODE(return 0);
+ default:
+ (*i) += advance;
+ break;
+ case NOT_SET: /* uri_text[i] introduces an invalid URI */
+ return 0;
+ }
+ }
+ /* *i is the first uri_text position past the \a query production, maybe \0 */
+ return 1;
+}
+
+static void do_nothing(void *ignored) {}
+static void parse_query_parts(grpc_uri *uri) {
+ static const char *QUERY_PARTS_SEPARATOR = "&";
+ static const char *QUERY_PARTS_VALUE_SEPARATOR = "=";
+ GPR_ASSERT(uri->query != NULL);
+ if (uri->query[0] == '\0') {
+ uri->query_parts = NULL;
+ uri->query_parts_values = NULL;
+ uri->num_query_parts = 0;
+ return;
+ }
+ gpr_slice query_slice =
+ gpr_slice_new(uri->query, strlen(uri->query), do_nothing);
+ gpr_slice_buffer query_parts; /* the &-separated elements of the query */
+ gpr_slice_buffer query_param_parts; /* the =-separated subelements */
+
+ gpr_slice_buffer_init(&query_parts);
+ gpr_slice_buffer_init(&query_param_parts);
+
+ gpr_slice_split(query_slice, QUERY_PARTS_SEPARATOR, &query_parts);
+ uri->query_parts = gpr_malloc(query_parts.count * sizeof(char *));
+ uri->query_parts_values = gpr_malloc(query_parts.count * sizeof(char *));
+ uri->num_query_parts = query_parts.count;
+ for (size_t i = 0; i < query_parts.count; i++) {
+ gpr_slice_split(query_parts.slices[i], QUERY_PARTS_VALUE_SEPARATOR,
+ &query_param_parts);
+ GPR_ASSERT(query_param_parts.count > 0);
+ uri->query_parts[i] =
+ gpr_dump_slice(query_param_parts.slices[0], GPR_DUMP_ASCII);
+ if (query_param_parts.count > 1) {
+ /* TODO(dgq): only the first value after the separator is considered.
+ * Perhaps all chars after the first separator for the query part should
+ * be included, even if they include the separator. */
+ uri->query_parts_values[i] =
+ gpr_dump_slice(query_param_parts.slices[1], GPR_DUMP_ASCII);
+ } else {
+ uri->query_parts_values[i] = NULL;
+ }
+ gpr_slice_buffer_reset_and_unref(&query_param_parts);
+ }
+ gpr_slice_buffer_destroy(&query_parts);
+ gpr_slice_buffer_destroy(&query_param_parts);
+ gpr_slice_unref(query_slice);
+}
+
+grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors) {
+ grpc_uri *uri;
+ size_t scheme_begin = 0;
+ size_t scheme_end = NOT_SET;
+ size_t authority_begin = NOT_SET;
+ size_t authority_end = NOT_SET;
+ size_t path_begin = NOT_SET;
+ size_t path_end = NOT_SET;
+ size_t query_begin = NOT_SET;
+ size_t query_end = NOT_SET;
+ size_t fragment_begin = NOT_SET;
+ size_t fragment_end = NOT_SET;
+ size_t i;
+
+ for (i = scheme_begin; uri_text[i] != 0; i++) {
+ if (uri_text[i] == ':') {
+ scheme_end = i;
+ break;
+ }
+ if (uri_text[i] >= 'a' && uri_text[i] <= 'z') continue;
+ if (uri_text[i] >= 'A' && uri_text[i] <= 'Z') continue;
+ if (i != scheme_begin) {
+ if (uri_text[i] >= '0' && uri_text[i] <= '9') continue;
+ if (uri_text[i] == '+') continue;
+ if (uri_text[i] == '-') continue;
+ if (uri_text[i] == '.') continue;
+ }
+ break;
+ }
+ if (scheme_end == NOT_SET) {
+ return bad_uri(uri_text, i, "scheme", suppress_errors);
+ }
+
+ if (uri_text[scheme_end + 1] == '/' && uri_text[scheme_end + 2] == '/') {
+ authority_begin = scheme_end + 3;
+ for (i = authority_begin; uri_text[i] != 0 && authority_end == NOT_SET;
+ i++) {
+ if (uri_text[i] == '/' || uri_text[i] == '?' || uri_text[i] == '#') {
+ authority_end = i;
+ }
+ }
+ if (authority_end == NOT_SET && uri_text[i] == 0) {
+ authority_end = i;
+ }
+ if (authority_end == NOT_SET) {
+ return bad_uri(uri_text, i, "authority", suppress_errors);
+ }
+ /* TODO(ctiller): parse the authority correctly */
+ path_begin = authority_end;
+ } else {
+ path_begin = scheme_end + 1;
+ }
+
+ for (i = path_begin; uri_text[i] != 0; i++) {
+ if (uri_text[i] == '?' || uri_text[i] == '#') {
+ path_end = i;
+ break;
+ }
+ }
+ if (path_end == NOT_SET && uri_text[i] == 0) {
+ path_end = i;
+ }
+ if (path_end == NOT_SET) {
+ return bad_uri(uri_text, i, "path", suppress_errors);
+ }
+
+ if (uri_text[i] == '?') {
+ query_begin = ++i;
+ if (!parse_fragment_or_query(uri_text, &i)) {
+ return bad_uri(uri_text, i, "query", suppress_errors);
+ } else if (uri_text[i] != 0 && uri_text[i] != '#') {
+ /* We must be at the end or at the beginning of a fragment */
+ return bad_uri(uri_text, i, "query", suppress_errors);
+ }
+ query_end = i;
+ }
+ if (uri_text[i] == '#') {
+ fragment_begin = ++i;
+ if (!parse_fragment_or_query(uri_text, &i)) {
+ return bad_uri(uri_text, i - fragment_end, "fragment", suppress_errors);
+ } else if (uri_text[i] != 0) {
+ /* We must be at the end */
+ return bad_uri(uri_text, i, "fragment", suppress_errors);
+ }
+ fragment_end = i;
+ }
+
+ uri = gpr_malloc(sizeof(*uri));
+ memset(uri, 0, sizeof(*uri));
+ uri->scheme = copy_component(uri_text, scheme_begin, scheme_end);
+ uri->authority = copy_component(uri_text, authority_begin, authority_end);
+ uri->path = copy_component(uri_text, path_begin, path_end);
+ uri->query = copy_component(uri_text, query_begin, query_end);
+ uri->fragment = copy_component(uri_text, fragment_begin, fragment_end);
+ parse_query_parts(uri);
+
+ return uri;
+}
+
+const char *grpc_uri_get_query_arg(const grpc_uri *uri, const char *key) {
+ GPR_ASSERT(key != NULL);
+ if (key[0] == '\0') return NULL;
+
+ for (size_t i = 0; i < uri->num_query_parts; ++i) {
+ if (0 == strcmp(key, uri->query_parts[i])) {
+ return uri->query_parts_values[i];
+ }
+ }
+ return NULL;
+}
+
+void grpc_uri_destroy(grpc_uri *uri) {
+ if (!uri) return;
+ gpr_free(uri->scheme);
+ gpr_free(uri->authority);
+ gpr_free(uri->path);
+ gpr_free(uri->query);
+ for (size_t i = 0; i < uri->num_query_parts; ++i) {
+ gpr_free(uri->query_parts[i]);
+ gpr_free(uri->query_parts_values[i]);
+ }
+ gpr_free(uri->query_parts);
+ gpr_free(uri->query_parts_values);
+ gpr_free(uri->fragment);
+ gpr_free(uri);
+}