从Apache配置文件提取主机名、虚拟IP、端口及日志目录

配置示例 #

<VirtualHost 192.168.1.10:80>
    ServerName www.example.com
    ServerAlias example.com
    DocumentRoot /var/www/example
    ErrorLog /var/log/apache2/example-error.log
    CustomLog /var/log/apache2/example-access.log combined
</VirtualHost>

<VirtualHost *:443>
    ServerName blog.example.com
    ServerAlias *.blog.example.com
    DocumentRoot /var/www/blog
    ErrorLog /var/log/apache2/blog-error.log
    CustomLog /var/www/blog-access.log combined
</VirtualHost>

预期CSV输出 #

FQDN,IP,Port,LogDirectory
www.example.com,192.168.1.10,80,/var/log/apache2
example.com,192.168.1.10,80,/var/log/apache2
blog.example.com,*,443,/var/log/apache2
*.blog.example.com,*,443,/var/log/apache2

需求一：关联FQDN与IP、端口 #

使用以下awk脚本，通过跟踪当前VirtualHost块的IP和端口，将其与ServerName/ServerAlias的FQDN关联：

BEGIN {
    FS = " "
    OFS = ","
    print "FQDN,IP,Port"
}

/^<VirtualHost/ {
    split($2, addr, ":")
    current_ip = addr[1]
    current_port = addr[2]
    next
}

/^[[:space:]]*Server(Name|Alias)/ {
    for (i=2; i<=NF; i++) {
        print $i, current_ip, current_port
    }
}

运行方式：awk -f script.awk httpd.conf > output.csv

需求二：添加日志目录并解决awk数组错误 #

错误“attempt to use array `logs' in a scalar context”是因为将数组当作普通标量变量使用（比如直接引用数组名而非数组元素）。修正方案是用普通变量跟踪当前VirtualHost的日志目录，而非数组：

BEGIN {
    FS = " "
    OFS = ","
    print "FQDN,IP,Port,LogDirectory"
}

/^<VirtualHost/ {
    split($2, addr, ":")
    current_ip = addr[1]
    current_port = addr[2]
    current_log_dir = ""  # 进入新虚拟主机时重置日志目录
    next
}

/^[[:space:]]*ErrorLog/ {
    log_path = $2
    sub(/\/[^\/]+$/, "", log_path)  # 去掉文件名，保留目录
    current_log_dir = log_path
    next
}

/^[[:space:]]*CustomLog/ {
    if (current_log_dir == "") {  # 优先用ErrorLog，没有则用CustomLog
        log_path = $2
        sub(/\/[^\/]+$/, "", log_path)
        current_log_dir = log_path
    }
    next
}

/^[[:space:]]*Server(Name|Alias)/ {
    for (i=2; i<=NF; i++) {
        print $i, current_ip, current_port, current_log_dir
    }
}

运行方式：awk -f script_with_logs.awk httpd.conf > output_with_logs.csv

内容的提问来源于stack exchange，提问作者bubez