Created
August 28, 2022 10:07
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| package main | |
| import ( | |
| "github.com/gin-gonic/gin" | |
| "net" | |
| "net/http" | |
| "os/exec" | |
| ) | |
| var privateNetworks []*net.IPNet | |
| func init() { | |
| for _, cidr := range []string{ | |
| // RFC 1918: private IPv4 networks | |
| "10.0.0.0/8", | |
| "172.16.0.0/12", | |
| "192.168.0.0/16", | |
| // RFC 4193: IPv6 ULAs | |
| "fc00::/7", | |
| // RFC 6598: reserved prefix for CGNAT | |
| "100.64.0.0/10", | |
| } { | |
| _, subnet, _ := net.ParseCIDR(cidr) | |
| privateNetworks = append(privateNetworks, subnet) | |
| } | |
| } | |
| // IsPrivateAddress returns whether an IP address belongs to the LAN. | |
| func IsPrivateAddress(ip net.IP) bool { | |
| for _, network := range privateNetworks { | |
| if network.Contains(ip) { | |
| return true | |
| } | |
| } | |
| return false | |
| } | |
| func main() { | |
| r := gin.Default() | |
| r.GET("/a", func(c *gin.Context) { | |
| ip := net.ParseIP(c.RemoteIP()) | |
| if IsPrivateAddress(ip) == true { | |
| c.JSON(http.StatusOK, gin.H{ | |
| "e": "private", | |
| }) | |
| return | |
| } | |
| s, e := exec.Command("/usr/sbin/ufw", "allow", "from", ip.String(), "to", "any").Output() | |
| if e != nil { | |
| c.JSON(http.StatusOK, gin.H{ | |
| "ri": e.Error(), | |
| }) | |
| return | |
| } | |
| c.JSON(http.StatusOK, gin.H{ | |
| "ri": ip.String(), | |
| "s": string(s), | |
| "ci": c.ClientIP(), | |
| }) | |
| return | |
| }) | |
| r.GET("/d", func(c *gin.Context) { | |
| ip := net.ParseIP(c.RemoteIP()) | |
| if IsPrivateAddress(ip) == true { | |
| c.JSON(http.StatusOK, gin.H{ | |
| "e": "private", | |
| }) | |
| return | |
| } | |
| exec.Command("/usr/sbin/ufw", "--force", "reset").Output() | |
| exec.Command("/usr/sbin/ufw", "allow", "80").Output() | |
| exec.Command("/usr/sbin/ufw", "allow", "22").Output() | |
| exec.Command("/usr/sbin/ufw", "--force", "enable").Output() | |
| c.JSON(http.StatusOK, gin.H{ | |
| "ri": ip.String(), | |
| "ci": c.ClientIP(), | |
| }) | |
| return | |
| }) | |
| r.Run(":80") | |
| } |
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