356 lines
8.0 KiB
Go
356 lines
8.0 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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// Parse the header files for OpenBSD and generate a Go usable sysctl MIB.
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//
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// Build a MIB with each entry being an array containing the level, type and
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// a hash that will contain additional entries if the current entry is a node.
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// We then walk this MIB and create a flattened sysctl name to OID hash.
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package main
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import (
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"bufio"
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"fmt"
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"os"
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"path/filepath"
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"regexp"
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"sort"
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"strings"
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)
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var (
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goos, goarch string
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)
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// cmdLine returns this programs's commandline arguments.
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func cmdLine() string {
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return "go run mksysctl_openbsd.go " + strings.Join(os.Args[1:], " ")
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}
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// buildTags returns build tags.
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func buildTags() string {
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return fmt.Sprintf("%s,%s", goarch, goos)
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}
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// reMatch performs regular expression match and stores the substring slice to value pointed by m.
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func reMatch(re *regexp.Regexp, str string, m *[]string) bool {
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*m = re.FindStringSubmatch(str)
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if *m != nil {
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return true
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}
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return false
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}
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type nodeElement struct {
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n int
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t string
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pE *map[string]nodeElement
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}
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var (
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debugEnabled bool
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mib map[string]nodeElement
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node *map[string]nodeElement
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nodeMap map[string]string
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sysCtl []string
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)
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var (
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ctlNames1RE = regexp.MustCompile(`^#define\s+(CTL_NAMES)\s+{`)
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ctlNames2RE = regexp.MustCompile(`^#define\s+(CTL_(.*)_NAMES)\s+{`)
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ctlNames3RE = regexp.MustCompile(`^#define\s+((.*)CTL_NAMES)\s+{`)
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netInetRE = regexp.MustCompile(`^netinet/`)
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netInet6RE = regexp.MustCompile(`^netinet6/`)
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netRE = regexp.MustCompile(`^net/`)
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bracesRE = regexp.MustCompile(`{.*}`)
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ctlTypeRE = regexp.MustCompile(`{\s+"(\w+)",\s+(CTLTYPE_[A-Z]+)\s+}`)
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fsNetKernRE = regexp.MustCompile(`^(fs|net|kern)_`)
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)
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func debug(s string) {
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if debugEnabled {
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fmt.Fprintln(os.Stderr, s)
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}
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}
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// Walk the MIB and build a sysctl name to OID mapping.
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func buildSysctl(pNode *map[string]nodeElement, name string, oid []int) {
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lNode := pNode // local copy of pointer to node
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var keys []string
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for k := range *lNode {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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for _, key := range keys {
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nodename := name
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if name != "" {
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nodename += "."
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}
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nodename += key
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nodeoid := append(oid, (*pNode)[key].n)
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if (*pNode)[key].t == `CTLTYPE_NODE` {
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if _, ok := nodeMap[nodename]; ok {
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lNode = &mib
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ctlName := nodeMap[nodename]
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for _, part := range strings.Split(ctlName, ".") {
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lNode = ((*lNode)[part]).pE
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}
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} else {
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lNode = (*pNode)[key].pE
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}
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buildSysctl(lNode, nodename, nodeoid)
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} else if (*pNode)[key].t != "" {
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oidStr := []string{}
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for j := range nodeoid {
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oidStr = append(oidStr, fmt.Sprintf("%d", nodeoid[j]))
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}
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text := "\t{ \"" + nodename + "\", []_C_int{ " + strings.Join(oidStr, ", ") + " } }, \n"
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sysCtl = append(sysCtl, text)
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}
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}
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}
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func main() {
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// Get the OS (using GOOS_TARGET if it exist)
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goos = os.Getenv("GOOS_TARGET")
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if goos == "" {
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goos = os.Getenv("GOOS")
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}
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// Get the architecture (using GOARCH_TARGET if it exists)
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goarch = os.Getenv("GOARCH_TARGET")
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if goarch == "" {
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goarch = os.Getenv("GOARCH")
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}
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// Check if GOOS and GOARCH environment variables are defined
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if goarch == "" || goos == "" {
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fmt.Fprintf(os.Stderr, "GOARCH or GOOS not defined in environment\n")
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os.Exit(1)
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}
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mib = make(map[string]nodeElement)
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headers := [...]string{
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`sys/sysctl.h`,
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`sys/socket.h`,
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`sys/tty.h`,
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`sys/malloc.h`,
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`sys/mount.h`,
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`sys/namei.h`,
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`sys/sem.h`,
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`sys/shm.h`,
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`sys/vmmeter.h`,
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`uvm/uvmexp.h`,
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`uvm/uvm_param.h`,
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`uvm/uvm_swap_encrypt.h`,
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`ddb/db_var.h`,
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`net/if.h`,
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`net/if_pfsync.h`,
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`net/pipex.h`,
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`netinet/in.h`,
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`netinet/icmp_var.h`,
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`netinet/igmp_var.h`,
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`netinet/ip_ah.h`,
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`netinet/ip_carp.h`,
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`netinet/ip_divert.h`,
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`netinet/ip_esp.h`,
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`netinet/ip_ether.h`,
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`netinet/ip_gre.h`,
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`netinet/ip_ipcomp.h`,
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`netinet/ip_ipip.h`,
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`netinet/pim_var.h`,
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`netinet/tcp_var.h`,
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`netinet/udp_var.h`,
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`netinet6/in6.h`,
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`netinet6/ip6_divert.h`,
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`netinet6/pim6_var.h`,
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`netinet/icmp6.h`,
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`netmpls/mpls.h`,
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}
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ctls := [...]string{
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`kern`,
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`vm`,
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`fs`,
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`net`,
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//debug /* Special handling required */
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`hw`,
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//machdep /* Arch specific */
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`user`,
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`ddb`,
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//vfs /* Special handling required */
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`fs.posix`,
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`kern.forkstat`,
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`kern.intrcnt`,
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`kern.malloc`,
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`kern.nchstats`,
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`kern.seminfo`,
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`kern.shminfo`,
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`kern.timecounter`,
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`kern.tty`,
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`kern.watchdog`,
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`net.bpf`,
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`net.ifq`,
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`net.inet`,
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`net.inet.ah`,
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`net.inet.carp`,
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`net.inet.divert`,
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`net.inet.esp`,
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`net.inet.etherip`,
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`net.inet.gre`,
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`net.inet.icmp`,
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`net.inet.igmp`,
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`net.inet.ip`,
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`net.inet.ip.ifq`,
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`net.inet.ipcomp`,
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`net.inet.ipip`,
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`net.inet.mobileip`,
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`net.inet.pfsync`,
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`net.inet.pim`,
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`net.inet.tcp`,
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`net.inet.udp`,
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`net.inet6`,
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`net.inet6.divert`,
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`net.inet6.ip6`,
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`net.inet6.icmp6`,
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`net.inet6.pim6`,
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`net.inet6.tcp6`,
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`net.inet6.udp6`,
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`net.mpls`,
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`net.mpls.ifq`,
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`net.key`,
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`net.pflow`,
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`net.pfsync`,
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`net.pipex`,
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`net.rt`,
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`vm.swapencrypt`,
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//vfsgenctl /* Special handling required */
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}
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// Node name "fixups"
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ctlMap := map[string]string{
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"ipproto": "net.inet",
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"net.inet.ipproto": "net.inet",
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"net.inet6.ipv6proto": "net.inet6",
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"net.inet6.ipv6": "net.inet6.ip6",
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"net.inet.icmpv6": "net.inet6.icmp6",
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"net.inet6.divert6": "net.inet6.divert",
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"net.inet6.tcp6": "net.inet.tcp",
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"net.inet6.udp6": "net.inet.udp",
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"mpls": "net.mpls",
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"swpenc": "vm.swapencrypt",
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}
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// Node mappings
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nodeMap = map[string]string{
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"net.inet.ip.ifq": "net.ifq",
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"net.inet.pfsync": "net.pfsync",
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"net.mpls.ifq": "net.ifq",
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}
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mCtls := make(map[string]bool)
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for _, ctl := range ctls {
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mCtls[ctl] = true
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}
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for _, header := range headers {
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debug("Processing " + header)
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file, err := os.Open(filepath.Join("/usr/include", header))
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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s := bufio.NewScanner(file)
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for s.Scan() {
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var sub []string
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if reMatch(ctlNames1RE, s.Text(), &sub) ||
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reMatch(ctlNames2RE, s.Text(), &sub) ||
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reMatch(ctlNames3RE, s.Text(), &sub) {
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if sub[1] == `CTL_NAMES` {
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// Top level.
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node = &mib
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} else {
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// Node.
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nodename := strings.ToLower(sub[2])
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ctlName := ""
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if reMatch(netInetRE, header, &sub) {
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ctlName = "net.inet." + nodename
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} else if reMatch(netInet6RE, header, &sub) {
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ctlName = "net.inet6." + nodename
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} else if reMatch(netRE, header, &sub) {
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ctlName = "net." + nodename
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} else {
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ctlName = nodename
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ctlName = fsNetKernRE.ReplaceAllString(ctlName, `$1.`)
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}
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if val, ok := ctlMap[ctlName]; ok {
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ctlName = val
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}
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if _, ok := mCtls[ctlName]; !ok {
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debug("Ignoring " + ctlName + "...")
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continue
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}
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// Walk down from the top of the MIB.
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node = &mib
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for _, part := range strings.Split(ctlName, ".") {
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if _, ok := (*node)[part]; !ok {
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debug("Missing node " + part)
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(*node)[part] = nodeElement{n: 0, t: "", pE: &map[string]nodeElement{}}
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}
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node = (*node)[part].pE
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}
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}
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// Populate current node with entries.
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i := -1
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for !strings.HasPrefix(s.Text(), "}") {
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s.Scan()
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if reMatch(bracesRE, s.Text(), &sub) {
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i++
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}
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if !reMatch(ctlTypeRE, s.Text(), &sub) {
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continue
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}
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(*node)[sub[1]] = nodeElement{n: i, t: sub[2], pE: &map[string]nodeElement{}}
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}
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}
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}
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err = s.Err()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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file.Close()
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}
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buildSysctl(&mib, "", []int{})
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sort.Strings(sysCtl)
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text := strings.Join(sysCtl, "")
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fmt.Printf(srcTemplate, cmdLine(), buildTags(), text)
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}
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const srcTemplate = `// %s
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// Code generated by the command above; DO NOT EDIT.
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// +build %s
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package unix
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type mibentry struct {
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ctlname string
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ctloid []_C_int
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}
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var sysctlMib = []mibentry {
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%s
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}
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`
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