389ds(ns-slapd)のデバッグ #389ds

CentOS8 の389dsについて ☞ 詳細

デバッグ情報を使う場合

準備

#"gdb"を入れておく
sudo dnf install gdb -y

#"debuginfo"インストール
sudo dnf debuginfo-install 389-ds-base --enablerepo=base-debuginfo -y

デバッグ

sudo gdb -p $(pidof ns-slapd)
...
(gdb) b acl_access_allowed
(gdb) c
... continueを止める場合はCtrl-c

ソースを使う場合

準備

#開発用ツールを入れておく
sudo dnf groupinstall 'Development Tools' -y

#ソースRPMをダウンロード
#dnf download --source 389-ds-base
#↑何故か見つからない
curl http://ftp.riken.jp/Linux/cern/centos/8.1.1911/AppStream/Source/SPackages/389-ds-base-1.4.1.3-7.module_el8.1.0+234+96aec258.src.rpm -O

#RPMを展開
mkdir 389-ds-base-rpm
cd 389-ds-base-rpm
rpm2cpio ../389-ds-base-1.4.1.3-7.module_el8.1.0+234+96aec258.src.rpm | cpio -id

#ソースを展開
tar jxf 389-ds-base-1.4.1.3.tar.bz2
cd 389-ds-base-1.4.1.3
#パッチ当て
for f in ../*.patch; do patch -p1 <$f; done

#configureスクリプトを作成
autoreconf -fiv

#下の"cracklib-devel"用
sudo dnf config-manager --enable PowerTools
#とにかくconfigureを通すためにいろいろ入れる
sudo dnf install cracklib-devel pam-devel libevent-devel nspr-devel nss-devel -y
sudo dnf install openldap-devel libdb-devel libicu-devel net-snmp-devel pcre-devel -y
sudo dnf install systemd-devel -y #下の"--with-systemd"用

#configure
./configure --prefix=/usr --with-systemd
#"--with-systemd"は起動設定(.service)が「Type=notify」の場合に必要

ビルドとインストール

#ビルド
make dberrstrs.h ns-slapd $(ls -1 /usr/lib64/dirsrv/plugins/ | sed 's/\.so/.la/' | paste -s -d' ')

#インストール
sudo cp .libs/ns-slapd /usr/sbin/
find /usr/lib64/dirsrv/plugins/* -type f | sed 's,.*/,.libs/,' | xargs -i sudo cp {} /usr/lib64/dirsrv/plugins/
find /usr/lib64/dirsrv/*.so* -type f | sed 's,.*/,.libs/,' | xargs -i sudo cp {} /usr/lib64/dirsrv/
find /usr/lib64/libsvr* -type f | sed 's,.*/,.libs/,' | xargs -i sudo cp {} /usr/lib64/

デバッグ (同上)

sudo gdb -p $(pidof ns-slapd)
...

コアを吐かせる

sudo -s

#あえて"0"にしてみる
ulimit -c 0

sysctl -w fs.suid_dumpable=1

#... ソースをいじってクラッシュさせる

#圧縮されたコアができる
ll /var/lib/systemd/coredump/

#最新分を確認
coredumpctl gdb -1

VSCodeを使う

前提

リモート機能拡張
C/C++機能拡張

エディター用の設定

.vscode/c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "/usr/include/**",
                "${workspaceFolder}/**"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c11",
            "cppStandard": "c++17",
            "intelliSenseMode": "gcc-x64",
            "forcedInclude": [
                "${workspaceFolder}/vscode.h"
            ]
        }
    ],
    "version": 4
}

↓ forcedInclude のファイル

vscode.h

//何故か未定義になる分
#define NULL         0
#define LONG_MAX     9223372036854775807L
#define LONG_MIN     (-LONG_MAX - 1L)
//makeの引数の分
#define HAVE_CONFIG_H    1
#define BUILD_NUM        "-"
#define VENDOR           "389 Project"
#define BRAND            "389"
#define CAPBRAND          "389"
#define LOCALSTATEDIR     "/var"
#define SYSCONFDIR        "/etc"
#define LIBDIR            "/usr/lib64"
#define BINDIR            "/usr/bin"
#define DATADIR           "/usr/share"
#define DOCDIR            "/usr/share/doc/389-ds-base"
#define SBINDIR           "/usr/sbin"
#define PLUGINDIR         "/usr/lib64/dirsrv/plugins"
#define TEMPLATEDIR       "/usr/share/dirsrv/data"
#define SYSTEMSCHEMADIR   "/usr/share/dirsrv/schema"

ビルド用の設定

.vscode/tasks.json

{
    "tasks": [
        {
            "type": "shell",
            "label": "vscode-make",
            "command": "/usr/bin/make",
            "args": ["vscode-make"]
        }
    ],
    "version": "2.0.0"
}

↓ Makefileに vscode-make を追加

vscode-make: ns-slapd $(serverplugin_LTLIBRARIES)
    sudo cp .libs/ns-slapd /usr/sbin/
    for i in $(serverplugin_LTLIBRARIES); do find .libs -name "$${i%.*}.so*" -type f | xargs -ri sudo cp {} /usr/lib64/dirsrv/plugins/; done
    for i in $(server_LTLIBRARIES); do find .libs -name "$${i%.*}.so*" -type f | xargs -ri sudo cp {} /usr/lib64/dirsrv/; done
    for i in $(lib_LTLIBRARIES); do find .libs -name "$${i%.*}.so*" -type f | xargs -ri sudo cp {} /usr/lib64/; done
    >$@

デバッグ用の設定

.vscode/launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "vscode-gdb",
            "type": "cppdbg",
            "request": "launch",
            "program": "/usr/sbin/ns-slapd",
            "args": ["-D", "/etc/dirsrv/slapd-localhost", "-d", "266354688"],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "setupCommands": [{"description":"enable-pretty-printing", "text":"-enable-pretty-printing", "ignoreFailures":true}],
            "preLaunchTask": "vscode-make",
            "miDebuggerPath": "${workspaceFolder}/vscode-gdb"
        }
    ]
}

↓ miDebuggerPath のファイル

echo 'sudo gdb $@' > vscode-gdb
chmod +x vscode-gdb