Replace `os_regex` with `RE2` in the Agent

[cborla]

Parent issue:

• Migrate Syscollector module to new agent

Description

Deprecate or remove the non-standard os_regex library and replace it with the standard RE2 library. This will improve compatibility and long-term maintainability of the Inventory module.

Tasks

• [x] Check if 5.0's agent suits all the conditions to use RE2.
• [x] Identify where os_regex is used in the codebase.
• [ ] Replace os_regex with RE2.
• [ ] Refactor the affected code for compatibility.
• [ ] Test the implementation to ensure functionality.

Testing tasks

• [ ] Ensure all unit tests pass after the replacement.
• [ ] Test compatibility on all supported platforms.

[LucioDonda]

Update 16/09/2024

• Check if 5.0's agent suits all the conditions to use RE2.:
  • based on some analysis it can be used without any problem, from c++14 it works. included in vcpk and basic examples checked.
  • Additional performance check here
• Identify where os_regex is used in the codebase:
  • OS_PRegex: os_string (1) and maybe in the configurations parser.
  • w_regexec: version_op (7) in the future if used maybe on remoted_op and wdb_global
  • w_sql_regex: Not used since 4.8.0 .
• Starting Replacement generating based UTs to be used for check In the newest version.

[LucioDonda]

Update 17/09/2024

• Starting migration.
  • working on some issues regarding compilation of C and C++ alongside

[LucioDonda]

Update 18/09/2024

After the team daily I came across that I was pointing to the wrong file. New analysis was made:

1) int OSRegex_Compile(const char *pattern, OSRegex *reg, int flags); Brief: Compile a regular expression to be used later Usage:

• expression.c (1) Tests (wrap):
• test_expression (4)
• github unit tests (8)

2) const char *OSRegex_Execute(const char *str, OSRegex *reg) __attribute__((nonnull(2))); Brief: Compares an already compiled OSRegex regular expression with a string Usage:

• Internal Only (os_regex.c and os_regex_execute.c) Tests (wrap):
• wm_github

3) const char *OSRegex_Execute_ex(const char *str, OSRegex *reg, regex_matching *regex_match) __attribute__((nonnull(2))); Brief: Compares an already compiled OSRegex regular expression with a string (+ struct for pattern matches) Usage:

• expression.c
• • Internal Tests:
• test_expression
• wraps schedule_scan , github

4) void OSRegex_FreePattern(OSRegex *reg); Brief: Release all the memory created by the compilation/execution phases Usage:

• expression.c
• Internal Tests:
• wrap: github

5) int OS_Regex(const char *pattern, const char *str); Brief: wrapper around the compile/execute functions. It should only be used when the pattern is only going to be used once. Usage:

• logcollector (1)
• common (rootcheck dir) (2)
• wm_sca (1)

6) int OSMatch_Compile(const char *pattern, OSMatch *reg, int flags); Brief: Compile a pattern to be used later. Usage:

• expression.c Tests:
• fim (test_create_db, test_fim_diff_changes, test_registry)

7) int OSMatch_Execute(const char *str, size_t str_len, OSMatch *reg); Brief: Compare an already compiled pattern with a not NULL string. Usage:

• expression.c
• fim (create_db, fim_diff_changes, registry)
• rootcheck.c

8) void OSMatch_FreePattern(OSMatch *reg); Brief: Release all the memory created by the compilation/execution phases */ Usage:

• expression.c Tests:
• fim (create_db, registry)

9) int OS_Match2(const char *pattern, const char *str) __attribute__((nonnull(2))); Brief: No Info Usage:

• rootcheck (common)
• wm_sca

10)int OS_WordMatch(const char *pattern, const char *str) __attribute__((nonnull)); Brief: Searches for pattern in the string OS_Match ??

11) char **OS_StrBreak(char match, const char *str, size_t size); Brief: Split a string into multiples pieces, divided by a char "match". Usage:

• debug_op (1)
• schedule_scan (3)
• string_op (1)
• version_op
• config.c wm_sca

12)size_t OS_StrHowClosedMatch(const char *str1, const char *str2); Brief: Returns the number of characters that both strings have in similar

13) int OS_StrStartsWith(const char *str, const char *pattern) __attribute__((nonnull)); Brief: Verifies if a string starts with the provided pattern.

14) int OS_StrIsNum(const char *str); Brief: Checks if a specific string is numeric (like "129544") */ Usage:

• Schedule_scan Tests:
• test_ schedule scan

15) void OSRegex_free_regex_matching (regex_matching *reg); Brief: Free memory of regex_matching struct Usage:

• expression.c (4)
• validate_op

[cborla]

I will move this issue to backlog again because it has no priority.