130 lines
3.5 KiB
Bash
130 lines
3.5 KiB
Bash
#!/bin/bash
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# Ver: 1.1 by Endial Fang (endial@126.com)
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#
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# 文件管理函数库
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# 加载依赖项
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. /usr/local/scripts/liblog.sh # 日志输出函数库
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# 函数列表
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# 域名解析
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# 参数:
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# $1 - 需要解析的主机名
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# $2 - IP 地址版本 v4/v6, 为空时解析所有版本
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# 返回值:
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# IP地址
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dns_lookup() {
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local host="${1:?host is missing}"
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local ip_version="${2:-}"
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getent "ahosts${ip_version}" "$host" | awk '/STREAM/ {print $1 }' | head -n 1
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}
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# 尝试解析域名并返回对应的 IP
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# 参数:
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# $1 - 主机名
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# $2 - 尝试次数
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# $3 - 重试间隔时间（秒）
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# 返回值:
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# IP地址
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wait_for_dns_lookup() {
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local hostname="${1:?hostname is missing}"
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local retries="${2:-5}"
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local seconds="${3:-1}"
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check_host() {
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if [[ $(dns_lookup "$hostname") == "" ]]; then
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false
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else
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true
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fi
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}
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# Wait for the host to be ready
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retry_while "check_host ${hostname}" "$retries" "$seconds"
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dns_lookup "$hostname"
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}
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# 获取当前主机 IP
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# 返回值:
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# IP地址
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get_machine_ip() {
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local -a ip_addresses
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local hostname
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hostname="$(hostname)"
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read -r -a ip_addresses <<< "$(dns_lookup "$hostname" | xargs echo)"
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if [[ "${#ip_addresses[@]}" -gt 1 ]]; then
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LOG_W "Found more than one IP address associated to hostname ${hostname}: ${ip_addresses[*]}, will use ${ip_addresses[0]}"
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elif [[ "${#ip_addresses[@]}" -lt 1 ]]; then
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LOG_E "Could not find any IP address associated to hostname ${hostname}"
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exit 1
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fi
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echo "${ip_addresses[0]}"
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}
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# 检测指定的主机名是否可解析
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# 参数:
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# $1 - 待检测的主机名
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# 返回值:
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# true / false
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is_hostname_resolved() {
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local -r host="${1:?missing value}"
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if [[ -n "$(dns_lookup "$host")" ]]; then
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true
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else
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false
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fi
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}
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# 解析 URL
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# 参数:
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# $1 - URI 字符串
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# $2 - 类型字符串. 有效值 (scheme, authority, userinfo, host, port, path, query or fragment)
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# 返回值:
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# 字符串
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parse_uri() {
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local uri="${1:?uri is missing}"
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local component="${2:?component is missing}"
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# Solution based on https://tools.ietf.org/html/rfc3986#appendix-B with
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# additional sub-expressions to split authority into userinfo, host and port
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# Credits to Patryk Obara (see https://stackoverflow.com/a/45977232/6694969)
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local -r URI_REGEX='^(([^:/?#]+):)?(//((([^@/?#]+)@)?([^:/?#]+)(:([0-9]+))?))?(/([^?#]*))?(\?([^#]*))?(#(.*))?'
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# || | ||| | | | | | | | | |
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# |2 scheme | ||6 userinfo 7 host | 9 port | 11 rpath | 13 query | 15 fragment
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# 1 scheme: | |5 userinfo@ 8 :... 10 path 12 ?... 14 #...
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# | 4 authority
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# 3 //...
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local index=0
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case "$component" in
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scheme)
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index=2
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;;
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authority)
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index=4
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;;
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userinfo)
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index=6
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;;
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host)
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index=7
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;;
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port)
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index=9
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;;
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path)
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index=10
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;;
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query)
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index=13
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;;
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fragment)
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index=14
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;;
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*)
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stderr_print "unrecognized component $component"
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return 1
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;;
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esac
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[[ "$uri" =~ $URI_REGEX ]] && echo "${BASH_REMATCH[${index}]}"
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}
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