67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
// Package ldd retrieves linker information by invoking ldd from glibc or musl and parsing its output.
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package ldd
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import (
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"math"
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"path"
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"strconv"
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"strings"
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)
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type Entry struct {
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Name string `json:"name,omitempty"`
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Path string `json:"path,omitempty"`
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Location uint64 `json:"location"`
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}
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func Parse(p []byte) ([]*Entry, error) {
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payload := strings.Split(strings.TrimSpace(string(p)), "\n")
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result := make([]*Entry, len(payload))
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for i, ent := range payload {
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if len(ent) == 0 {
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return nil, ErrUnexpectedNewline
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}
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segment := strings.SplitN(ent, " ", 5)
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// location index
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var iL int
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switch len(segment) {
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case 2: // /lib/ld-musl-x86_64.so.1 (0x7f04d14ef000)
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iL = 1
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result[i] = &Entry{Name: strings.TrimSpace(segment[0])}
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case 4: // libc.musl-x86_64.so.1 => /lib/ld-musl-x86_64.so.1 (0x7f04d14ef000)
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iL = 3
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if segment[1] != "=>" {
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return nil, ErrUnexpectedSeparator
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}
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if !path.IsAbs(segment[2]) {
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return nil, ErrPathNotAbsolute
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}
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result[i] = &Entry{
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Name: strings.TrimSpace(segment[0]),
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Path: segment[2],
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}
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default:
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return nil, EntryUnexpectedSegmentsError(ent)
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}
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if loc, err := parseLocation(segment[iL]); err != nil {
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return nil, err
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} else {
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result[i].Location = loc
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}
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}
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return result, nil
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}
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func parseLocation(s string) (uint64, error) {
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if len(s) < 4 || s[len(s)-1] != ')' || s[:3] != "(0x" {
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return math.MaxUint64, ErrBadLocationFormat
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}
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return strconv.ParseUint(s[3:len(s)-1], 16, 64)
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}
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