From: "Maxin B. John" <maxin.john@xxxxxxxxx>
In order to support alternative libc on linux ( musl, bioninc) etc we need
to check for glibc-only features and provide alternatives. In this list
strndupa is first one. When configure detects that its not included
in system C library then the altrnative implementation from missing.h is
used
Signed-off-by: Khem Raj <raj.khem@xxxxxxxxx>
Signed-off-by: Maxin B. John <maxin.john@xxxxxxxxx>
---
configure.ac | 3 +++
libpam/include/missing.h | 12 ++++++++++++
modules/pam_exec/pam_exec.c | 1 +
3 files changed, 16 insertions(+)
create mode 100644 libpam/include/missing.h
diff --git a/configure.ac b/configure.ac
index e68d856..d4d7582 100644
--- a/configure.ac
+++ b/configure.ac
@@ -592,6 +592,9 @@ dnl
AC_CHECK_DECL(__NR_keyctl, [have_key_syscalls=1],[have_key_syscalls=0],[#include <sys/syscall.h>])
AC_CHECK_DECL(ENOKEY, [have_key_errors=1],[have_key_errors=0],[#include <errno.h>])
+# musl and bionic don't have strndupa
+AC_CHECK_DECLS_ONCE([strndupa])
+
HAVE_KEY_MANAGEMENT=0
if test $have_key_syscalls$have_key_errors = 11
then
diff --git a/libpam/include/missing.h b/libpam/include/missing.h
new file mode 100644
index 0000000..3cf011c
--- /dev/null
+++ b/libpam/include/missing.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#if !HAVE_DECL_STRNDUPA
+#define strndupa(s, n) \
+ ({ \
+ const char *__old = (s); \
+ size_t __len = strnlen(__old, (n)); \
+ char *__new = alloca(__len + 1); \
+ __new[__len] = '\0'; \
+ memcpy(__new, __old, __len); \
+ })
+#endif
diff --git a/modules/pam_exec/pam_exec.c b/modules/pam_exec/pam_exec.c
index 0ab6548..84e8dd4 100644
--- a/modules/pam_exec/pam_exec.c
+++ b/modules/pam_exec/pam_exec.c
@@ -59,6 +59,7 @@
#include <security/pam_modutil.h>
#include <security/pam_ext.h>
#include <security/_pam_macros.h>
+#include <missing.h>
#define ENV_ITEM(n) { (n), #n }
static struct {
--
2.4.0
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