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