`ndpiReader` is only an example, aiming to show nDPI capabilities
and integration, without any claim about performances.
Nonetheless its memory usage per flow is *huge*, limiting the kinds
of traces that we can test on a "normal" hardware (example: scan
attacks).
The key reason of that behaviour is that we preallocate all the memory
needed for *all* the available features.
Try to reduce memory usage simply allocating some structures only
when they are really needed. Most significant example: JOY algorithms.
This way we should use a lot less memory in the two most common
user-cases:
* `ndpiReader` invoked without any particular flag (i.e `ndpiReader -i
$FILENAME_OR_IFACE`)
* internal unit tests
Before (on x86_64):
```
struct ndpi_flow_info {
[...]
/* size: 7320, cachelines: 115, members: 72 */
```
After:
```
struct ndpi_flow_info {
[...]
/* size: 2128, cachelines: 34, members: 75 */
```
This protocol is detected via HTTP Content-Type header.
Until 89d548f9, nDPI had a dedicated automa (`content_automa`) to
classify a HTTP flow according to this header. Since then, this automa has
been useless because it is always empty.
Re-enable it to match only a string seems overkilling.
Remove all `content_automa` leftovers.
Fix all the warnings.
Getting rid of "-Wno-unused-parameter" is quite complex because some
parameters usage depends on compilation variable (i.e.
`--enable-debug-messages`).
The "-Werror" flag has been added only in Travis builds to avoid
breaking the builds to users using uncommon/untested
OS/compiler/enviroment.
Tested on:
* x86_64; Ubuntu 20.04; gcc 7,8,9,10,11; clang 7,8,9,10,11,12
* x86_64; CentOS 7.7; gcc 4.8.5 (with "--disable-gcrypt" flag)
* Raspberry 4; Debian 10.10; gcc 8.3.0
* Added ARM build and unit test run for SonarCloud-CI.
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Fixed Mingw64 build.
* adapted to SonarCloud-CI workflow
* removed broken and incomplete Windows example (tested on VS2017/VS2019)
* removed unnecessary include (e.g. pthread.h for the library which does not make use of it)
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
The goal is to have a (roughly) idea about how many packets nDPI needs
to properly classify a flow.
Log this information (and guessed flows number too) during unit tests,
to keep track of improvements/regressions across commits.
Simplified the process of adding lines to AC_AUTOMATA_t.
Use the ndpi_string_to_automa() function to add patterns with domain names.
For other cases can use ndpi_add_string_value_to_automa().
ac_automata_feature(ac_automa, AC_FEATURE_LC) allows adding
and compare data in a case insensitive manner. For mandatory pattern comparison
from the end of the line, the "ac_pattern.rep.at_end=1" flag is used.
This eliminated unnecessary conversions to lowercase and adding "$" for
end-of-line matching in domain name patterns.
ac_match_handler() has been renamed ac_domain_match_handler() and has been greatly simplified.
ac_domain_match_handler() looks for the template with the highest domain level.
For special cases it is possible to manually specify the domain level.
Added test for checking ambiguous domain names like:
- short.weixin.qq.com is QQ, not Wechat
- instagram.faae1-1.fna.fbcdn.net is Instagram, not Facebook
If you specify a NULL handler when creating the AC_AUTOMATA_t structure,
then a pattern with the maximum length that satisfies the search conditions will be found
(exact match, from the beginning of the string, from the end of the string, or a substring).
Added debugging for ac_automata_search.
To do this, you need to enable debugging globally using ac_automata_enable_debug(1) and
enable debugging in the AC_AUTOMATA_t structure using ac_automata_name("name", AC_FEATURE_DEBUG).
The search will display "name" and a list of matching patterns.
Running "AHO_DEBUG=1 ndpiReader ..." will show the lines that were searched for templates
and which templates were found.
The ac_automata_dump() prototype has been changed. Now it outputs data to a file.
If it is specified as NULL, then the output will be directed to stdout.
If you need to get data as a string, then use open_memstream().
Added the ability to run individual tests via the do.sh script
Non-critical bugs.
If a file list is used, then all files except the last are not closed.
Opening the next file loses the memory allocated via pcap_open_offline() for the previous file.
If a bpf filter is used, then no memory is freed after pcap_compile.
* Refactored and merged callback buffer routines for non-udp-tcp / udp / tcp / tcp-wo-payload.
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Try to detect one subprotocol if a detected protocol can have one.
* This adds a performance overhead due to much more protocol detection routine calls.
See #1148 for more information.
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Refactor subprotocol handling (1/2).
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Refactor subprotocol handling (2/2).
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Prevent some code duplication by using macros for ndpi_int_one_line_struct string comparision.
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Refactored aimini HTTP detection parts (somehow related to #1148).
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Added aimini client/server test pcap.
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* Removed master protocol as it was only used for STUN and via also removed API function ndpi_get_protocol_id_master_proto
* Adjusted Python code to conform to the changes made during the refactoring process.
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
