1 files changed, 41 insertions, 0 deletions
diff --git a/src/nshd/hackers_git/name2gid.go b/src/nshd/hackers_git/name2gid.go
new file mode 100644
index 0000000..b33e6aa
--- /dev/null
+++ b/src/nshd/hackers_git/name2gid.go
@@ -0,0 +1,41 @@
+package hackers_git
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+//#include <stdlib.h> /* free */
+//#include <unistd.h> /* sysconf */
+//#include <grp.h>    /* getgrnam_r */
+import "C"
+
+func name2gid(name string) (gid int32) {
+	nameC := C.CString(name)
+	defer C.free(unsafe.Pointer(nameC))
+
+	gid = -1
+	buflen := C.sysconf(C._SC_GETGR_R_SIZE_MAX)
+	if buflen < 1 {
+		buflen = 1024
+	}
+	buf := make([]byte, buflen)
+	var grp C.struct_group
+	var ret *C.struct_group
+	for {
+		success, errno := C.getgrnam_r(nameC, &grp, (*C.char)(unsafe.Pointer(&buf[0])), C.size_t(buflen), &ret)
+		if success >= 0 {
+			break
+		}
+		if errno == syscall.ERANGE {
+			buflen += 256
+			buf = make([]byte, buflen)
+		} else {
+			return
+		}
+	}
+	if ret != nil {
+		gid = int32(ret.gr_gid)
+	}
+	return
+}