Since our target is not in the same process, the netlink macros NLMSG_*
must be rewritten for strace.
* netlink.c (nlmsg_ok, nlmsg_next): New functions.
---
netlink.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/netlink.c b/netlink.c
index 738c639..bb2c3a7 100644
--- a/netlink.c
+++ b/netlink.c
@@ -33,6 +33,32 @@
#include "xlat/netlink_flags.h"
#include "xlat/netlink_types.h"
+/* since our target is not in the same process, here are some utils for nlmsg
*/
+static int
+nlmsg_ok(struct tcb *tcp, unsigned long nlh, unsigned long len) {
+ struct nlmsghdr nlmsghdr;
+
+ if (umoven(tcp, nlh, sizeof(struct nlmsghdr), &nlmsghdr) == -1)
+ return 0;
+
+ return (len >= (int)sizeof(struct nlmsghdr)) &&
+ nlmsghdr.nlmsg_len >= sizeof(struct nlmsghdr) &&
+ nlmsghdr.nlmsg_len <= len;
+}
+
+static unsigned long
+nlmsg_next(struct tcb *tcp, unsigned long nlh, unsigned long *len) {
+ struct nlmsghdr nlmsghdr;
+
+ if (umoven(tcp, nlh, sizeof(struct nlmsghdr), &nlmsghdr) == -1)
+ return 0;
+
+ *len -= NLMSG_ALIGN(nlmsghdr.nlmsg_len);
+
+ return (unsigned long)
+ ((char *)(nlh) + NLMSG_ALIGN(nlmsghdr.nlmsg_len));
+}
+
void
decode_netlink_or_printaddr(struct tcb *tcp, unsigned long addr,
unsigned long size)
--
2.8.3
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