| 1 | /* |
| 2 | * Copyright (C) 2014 Jonathan Rajotte <jonathan.r.julien@gmail.com> |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; version 2.1 of |
| 7 | * the License. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | /* |
| 20 | * This script validate and xml from an xsd. |
| 21 | * argv[1] Path of the xsd |
| 22 | * argv[2] Path to the XML to be validated |
| 23 | */ |
| 24 | |
| 25 | #define _GNU_SOURCE |
| 26 | #include <assert.h> |
| 27 | #include <ctype.h> |
| 28 | #include <stdio.h> |
| 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | #include <inttypes.h> |
| 32 | #include <dirent.h> |
| 33 | #include <unistd.h> |
| 34 | #include <sys/types.h> |
| 35 | #include <sys/stat.h> |
| 36 | |
| 37 | #include <libxml/xmlschemas.h> |
| 38 | #include <libxml/parser.h> |
| 39 | |
| 40 | #include <lttng/lttng-error.h> |
| 41 | |
| 42 | struct validation_ctx { |
| 43 | xmlSchemaParserCtxtPtr parser_ctx; |
| 44 | xmlSchemaPtr schema; |
| 45 | xmlSchemaValidCtxtPtr schema_validation_ctx; |
| 46 | }; |
| 47 | |
| 48 | enum command_err_code { |
| 49 | CMD_SUCCESS = 0, |
| 50 | CMD_ERROR |
| 51 | }; |
| 52 | |
| 53 | static |
| 54 | void xml_error_handler(void *ctx, const char *format, ...) |
| 55 | { |
| 56 | char *err_msg; |
| 57 | va_list args; |
| 58 | int ret; |
| 59 | |
| 60 | va_start(args, format); |
| 61 | ret = vasprintf(&err_msg, format, args); |
| 62 | va_end(args); |
| 63 | if (ret == -1) { |
| 64 | fprintf(stderr, "ERR: %s\n", |
| 65 | "String allocation failed in xml error handle"); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | fprintf(stderr, "XML Error: %s\n", err_msg); |
| 70 | free(err_msg); |
| 71 | } |
| 72 | |
| 73 | static |
| 74 | void fini_validation_ctx( |
| 75 | struct validation_ctx *ctx) |
| 76 | { |
| 77 | if (ctx->parser_ctx) { |
| 78 | xmlSchemaFreeParserCtxt(ctx->parser_ctx); |
| 79 | } |
| 80 | |
| 81 | if (ctx->schema) { |
| 82 | xmlSchemaFree(ctx->schema); |
| 83 | } |
| 84 | |
| 85 | if (ctx->schema_validation_ctx) { |
| 86 | xmlSchemaFreeValidCtxt(ctx->schema_validation_ctx); |
| 87 | } |
| 88 | |
| 89 | memset(ctx, 0, sizeof(struct validation_ctx)); |
| 90 | } |
| 91 | |
| 92 | static |
| 93 | int init_validation_ctx( |
| 94 | struct validation_ctx *ctx, char *xsd_path) |
| 95 | { |
| 96 | int ret; |
| 97 | |
| 98 | if (!xsd_path) { |
| 99 | ret = -LTTNG_ERR_NOMEM; |
| 100 | goto end; |
| 101 | } |
| 102 | |
| 103 | ctx->parser_ctx = xmlSchemaNewParserCtxt(xsd_path); |
| 104 | if (!ctx->parser_ctx) { |
| 105 | ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; |
| 106 | goto end; |
| 107 | } |
| 108 | xmlSchemaSetParserErrors(ctx->parser_ctx, xml_error_handler, |
| 109 | xml_error_handler, NULL); |
| 110 | |
| 111 | ctx->schema = xmlSchemaParse(ctx->parser_ctx); |
| 112 | if (!ctx->schema) { |
| 113 | ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; |
| 114 | goto end; |
| 115 | } |
| 116 | |
| 117 | ctx->schema_validation_ctx = xmlSchemaNewValidCtxt(ctx->schema); |
| 118 | if (!ctx->schema_validation_ctx) { |
| 119 | ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; |
| 120 | goto end; |
| 121 | } |
| 122 | |
| 123 | xmlSchemaSetValidErrors(ctx->schema_validation_ctx, xml_error_handler, |
| 124 | xml_error_handler, NULL); |
| 125 | ret = 0; |
| 126 | |
| 127 | end: |
| 128 | if (ret) { |
| 129 | fini_validation_ctx(ctx); |
| 130 | } |
| 131 | return ret; |
| 132 | } |
| 133 | |
| 134 | static int validate_xml(const char *xml_file_path, struct validation_ctx *ctx) |
| 135 | { |
| 136 | int ret; |
| 137 | xmlDocPtr doc = NULL; |
| 138 | |
| 139 | assert(xml_file_path); |
| 140 | assert(ctx); |
| 141 | |
| 142 | /* Open the document */ |
| 143 | doc = xmlParseFile(xml_file_path); |
| 144 | if (!doc) { |
| 145 | ret = LTTNG_ERR_MI_IO_FAIL; |
| 146 | goto end; |
| 147 | } |
| 148 | |
| 149 | /* Validate against the validation ctx (xsd) */ |
| 150 | ret = xmlSchemaValidateDoc(ctx->schema_validation_ctx, doc); |
| 151 | if (ret) { |
| 152 | fprintf(stderr, "ERR: %s\n", "XML is not valid againt provided XSD"); |
| 153 | ret = CMD_ERROR; |
| 154 | goto end; |
| 155 | } |
| 156 | |
| 157 | ret = CMD_SUCCESS; |
| 158 | end: |
| 159 | return ret; |
| 160 | |
| 161 | |
| 162 | } |
| 163 | int main(int argc, char **argv, char *env[]) |
| 164 | { |
| 165 | int ret; |
| 166 | struct validation_ctx ctx; |
| 167 | |
| 168 | /* Check if we have all argument */ |
| 169 | if (argc < 3) { |
| 170 | fprintf(stderr, "ERR: %s\n", "Missing arguments"); |
| 171 | ret = CMD_ERROR; |
| 172 | goto end; |
| 173 | } |
| 174 | |
| 175 | /* Check if xsd file exist */ |
| 176 | ret = access(argv[1], F_OK); |
| 177 | if (ret < 0) { |
| 178 | fprintf(stderr, "ERR: %s\n", "Xsd path not valid"); |
| 179 | goto end; |
| 180 | } |
| 181 | |
| 182 | /* Check if xml to validate exist */ |
| 183 | ret = access(argv[2], F_OK); |
| 184 | if (ret < 0) { |
| 185 | fprintf(stderr, "ERR: %s\n", "XML path not valid"); |
| 186 | goto end; |
| 187 | } |
| 188 | |
| 189 | /* initialize the validation ctx */ |
| 190 | ret = init_validation_ctx(&ctx, argv[1]); |
| 191 | if (ret) { |
| 192 | goto end; |
| 193 | } |
| 194 | |
| 195 | ret = validate_xml(argv[2], &ctx); |
| 196 | |
| 197 | fini_validation_ctx(&ctx); |
| 198 | |
| 199 | end: |
| 200 | return ret; |
| 201 | } |