| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #include "url.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| /** |
| * Returns whether the given character is a character that need not be |
| * escaped when included as part of a component of a URL. |
| * |
| * @param c |
| * The character to test. |
| * |
| * @return |
| * Zero if the character does not need to be escaped when included as |
| * part of a component of a URL, non-zero otherwise. |
| */ |
| static int guac_kubernetes_is_url_safe(char c) { |
| return (c >= 'A' && c <= 'Z') |
| || (c >= 'a' && c <= 'z') |
| || (c >= '0' && c <= '9') |
| || strchr("-_.!~*'()", c) != NULL; |
| } |
| |
| int guac_kubernetes_escape_url_component(char* output, int length, |
| const char* str) { |
| |
| char* current = output; |
| while (*str != '\0') { |
| |
| char c = *str; |
| |
| /* Store alphanumeric characters verbatim */ |
| if (guac_kubernetes_is_url_safe(c)) { |
| |
| /* Verify space exists for single character */ |
| if (length < 1) |
| return 1; |
| |
| *(current++) = c; |
| length--; |
| |
| } |
| |
| /* Escape EVERYTHING else as hex */ |
| else { |
| |
| /* Verify space exists for hex-encoded character */ |
| if (length < 4) |
| return 1; |
| |
| snprintf(current, 4, "%%%02X", (int) c); |
| |
| current += 3; |
| length -= 3; |
| } |
| |
| /* Next character */ |
| str++; |
| |
| } |
| |
| /* Verify space exists for null terminator */ |
| if (length < 1) |
| return 1; |
| |
| /* Append null terminator */ |
| *current = '\0'; |
| return 0; |
| |
| } |
| |
| int guac_kubernetes_append_endpoint_param(char* buffer, int length, |
| const char* param_name, const char* param_value) { |
| |
| char escaped_param_value[GUAC_KUBERNETES_MAX_ENDPOINT_LENGTH]; |
| |
| /* Escape value */ |
| if (guac_kubernetes_escape_url_component(escaped_param_value, |
| sizeof(escaped_param_value), param_value)) |
| return 1; |
| |
| char* str = buffer; |
| |
| int str_len = 0; |
| int qmark = 0; |
| |
| while (*str != '\0') { |
| |
| /* Look for a question mark */ |
| if (*str=='?') qmark = 1; |
| |
| /* Compute the buffer string length */ |
| str_len++; |
| |
| /* Verify the buffer null terminated */ |
| if (str_len >= length) return 1; |
| |
| /* Next character */ |
| str++; |
| } |
| |
| /* Determine the parameter delimiter */ |
| char delimiter = '?'; |
| if (qmark) delimiter = '&'; |
| |
| /* Advance to end of buffer, where the new parameter and delimiter need to |
| * be appended */ |
| buffer += str_len; |
| length -= str_len; |
| |
| /* Write the parameter and delimiter to the buffer */ |
| int written = snprintf(buffer, length, "%c%s=%s", delimiter, |
| param_name, escaped_param_value); |
| |
| /* The parameter was successfully added if it was written to the given |
| * buffer without truncation */ |
| return (written < 0 || written >= length); |
| } |
| |
| int guac_kubernetes_endpoint_uri(char* buffer, int length, |
| const char* kubernetes_namespace, const char* kubernetes_pod, |
| const char* kubernetes_container, const char* exec_command) { |
| |
| char escaped_namespace[GUAC_KUBERNETES_MAX_ENDPOINT_LENGTH]; |
| char escaped_pod[GUAC_KUBERNETES_MAX_ENDPOINT_LENGTH]; |
| |
| /* Escape Kubernetes namespace */ |
| if (guac_kubernetes_escape_url_component(escaped_namespace, |
| sizeof(escaped_namespace), kubernetes_namespace)) |
| return 1; |
| |
| /* Escape name of Kubernetes pod */ |
| if (guac_kubernetes_escape_url_component(escaped_pod, |
| sizeof(escaped_pod), kubernetes_pod)) |
| return 1; |
| |
| /* Determine the call type */ |
| char* call = "attach"; |
| if (exec_command != NULL) |
| call = "exec"; |
| |
| int written; |
| |
| /* Generate the endpoint path and write to the buffer */ |
| written = snprintf(buffer, length, |
| "/api/v1/namespaces/%s/pods/%s/%s", escaped_namespace, escaped_pod, call); |
| |
| /* Operation successful if the endpoint path was written to the given |
| * buffer without truncation */ |
| if (written < 0 || written >= length) |
| return 1; |
| |
| /* Append exec command parameter */ |
| if (exec_command != NULL) { |
| if (guac_kubernetes_append_endpoint_param(buffer, |
| length, "command", exec_command)) |
| return 1; |
| } |
| |
| /* Append kubernetes container parameter */ |
| if (kubernetes_container != NULL) { |
| if (guac_kubernetes_append_endpoint_param(buffer, |
| length, "container", kubernetes_container)) |
| return 1; |
| } |
| |
| /* Append stdin, stdout and tty parameters */ |
| return (guac_kubernetes_append_endpoint_param(buffer, length, "stdin", "true")) |
| || (guac_kubernetes_append_endpoint_param(buffer, length, "stdout", "true")) |
| || (guac_kubernetes_append_endpoint_param(buffer, length, "tty", "true")); |
| } |