src/common/filter/filter-visitor-ir-validate-string.c

   1 /*
   2  * filter-visitor-ir-validate-string.c
   3  *
   4  * LTTng filter IR validate string
   5  *
   6  * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   8  * SPDX-License-Identifier: LGPL-2.1-only
   9  *
  10  */
  11
  12 #include <stdio.h>
  13 #include <unistd.h>
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <inttypes.h>
  17
  18 #include <common/macros.h>
  19 #include <common/compat/errno.h>
  20
  21 #include "filter-ast.h"
  22 #include "filter-parser.h"
  23 #include "filter-ir.h"
  24
  25 enum parse_char_result {
  26         PARSE_CHAR_UNKNOWN = -2,
  27         PARSE_CHAR_WILDCARD = -1,
  28         PARSE_CHAR_NORMAL = 0,
  29 };
  30
  31 static
  32 enum parse_char_result parse_char(const char **p)
  33 {
  34         switch (**p) {
  35         case '\\':
  36                 (*p)++;
  37                 switch (**p) {
  38                 case '\\':
  39                 case '*':
  40                         return PARSE_CHAR_NORMAL;
  41                 default:
  42                         return PARSE_CHAR_UNKNOWN;
  43                 }
  44         case '*':
  45                 return PARSE_CHAR_WILDCARD;
  46         default:
  47                 return PARSE_CHAR_NORMAL;
  48         }
  49 }
  50
  51 static
  52 int validate_string(struct ir_op *node)
  53 {
  54         switch (node->op) {
  55         case IR_OP_UNKNOWN:
  56         default:
  57                 fprintf(stderr, "[error] %s: unknown op type\n", __func__);
  58                 return -EINVAL;
  59
  60         case IR_OP_ROOT:
  61                 return validate_string(node->u.root.child);
  62         case IR_OP_LOAD:
  63         {
  64                 int ret = 0;
  65
  66                 if (node->data_type == IR_DATA_STRING) {
  67                         const char *str;
  68
  69                         LTTNG_ASSERT(node->u.load.u.string.value);
  70                         str = node->u.load.u.string.value;
  71
  72                         for (;;) {
  73                                 enum parse_char_result res;
  74
  75                                 if (!(*str)) {
  76                                         break;
  77                                 }
  78
  79                                 res = parse_char(&str);
  80                                 str++;
  81
  82                                 switch (res) {
  83                                 case PARSE_CHAR_UNKNOWN:
  84                                         ret = -EINVAL;
  85                                         fprintf(stderr,
  86                                                 "Unsupported escape character detected.\n");
  87                                         goto end_load;
  88                                 case PARSE_CHAR_NORMAL:
  89                                 default:
  90                                         break;
  91                                 }
  92                         }
  93                 }
  94 end_load:
  95                 return ret;
  96         }
  97         case IR_OP_UNARY:
  98                 return validate_string(node->u.unary.child);
  99         case IR_OP_BINARY:
 100         {
 101                 int ret = validate_string(node->u.binary.left);
 102
 103                 if (ret)
 104                         return ret;
 105                 return validate_string(node->u.binary.right);
 106         }
 107         case IR_OP_LOGICAL:
 108         {
 109                 int ret;
 110
 111                 ret = validate_string(node->u.logical.left);
 112                 if (ret)
 113                         return ret;
 114                 return validate_string(node->u.logical.right);
 115         }
 116         }
 117 }
 118
 119 LTTNG_HIDDEN
 120 int filter_visitor_ir_validate_string(struct filter_parser_ctx *ctx)
 121 {
 122         return validate_string(ctx->ir_root);
 123 }