Add new interceptors: getnetent(3) family

Summary:
getnetent, getnetbyaddr, getnetbyname - get network entry

Reuse them on NetBSD.

Sponsored by <The NetBSD Foundation>

Reviewers: joerg, vitalybuka

Reviewed By: vitalybuka

Subscribers: llvm-commits, kubamracek, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D43543

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@326163 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 71 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_common_interceptors.inc b/lib/sanitizer_common/sanitizer_common_interceptors.inc
index 8cd329f1a..7f6bc3412 100644
--- a/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -6955,6 +6955,76 @@ INTERCEPTOR(struct __sanitizer_protoent *, getprotobynumber, int proto) {
 #define INIT_PROTOENT
 #endif
 
+#if SANITIZER_INTERCEPT_NETENT
+INTERCEPTOR(struct __sanitizer_netent *, getnetent) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, getnetent);
+  struct __sanitizer_netent *n = REAL(getnetent)();
+  if (n) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n, sizeof(*n));
+
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, REAL(strlen)(n->n_name) + 1);
+
+    SIZE_T nn_size = 1; // One handles the trailing \0
+
+    for (char **nn = n->n_aliases; *nn; ++nn, ++nn_size)
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, REAL(strlen)(*nn) + 1);
+
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_aliases,
+                                   nn_size * sizeof(char **));
+  }
+  return n;
+}
+
+INTERCEPTOR(struct __sanitizer_netent *, getnetbyname, const char *name) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, getnetbyname, name);
+  if (name)
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  struct __sanitizer_netent *n = REAL(getnetbyname)(name);
+  if (n) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n, sizeof(*n));
+
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, REAL(strlen)(n->n_name) + 1);
+
+    SIZE_T nn_size = 1; // One handles the trailing \0
+
+    for (char **nn = n->n_aliases; *nn; ++nn, ++nn_size)
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, REAL(strlen)(*nn) + 1);
+
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_aliases,
+                                   nn_size * sizeof(char **));
+  }
+  return n;
+}
+
+INTERCEPTOR(struct __sanitizer_netent *, getnetbyaddr, u32 net, int type) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, getnetbyaddr, net, type);
+  struct __sanitizer_netent *n = REAL(getnetbyaddr)(net, type);
+  if (n) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n, sizeof(*n));
+
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_name, REAL(strlen)(n->n_name) + 1);
+
+    SIZE_T nn_size = 1; // One handles the trailing \0
+
+    for (char **nn = n->n_aliases; *nn; ++nn, ++nn_size)
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, *nn, REAL(strlen)(*nn) + 1);
+
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, n->n_aliases,
+                                   nn_size * sizeof(char **));
+  }
+  return n;
+}
+#define INIT_NETENT \
+  COMMON_INTERCEPT_FUNCTION(getnetent); \
+  COMMON_INTERCEPT_FUNCTION(getnetbyname); \
+  COMMON_INTERCEPT_FUNCTION(getnetbyaddr)
+#else
+#define INIT_NETENT
+#endif
+
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
   interceptor_metadata_map = new((void *)&metadata_mem) MetadataHashMap();
@@ -7187,6 +7257,7 @@ static void InitializeCommonInterceptors() {
   INIT_STRMODE;
   INIT_TTYENT;
   INIT_PROTOENT;
+  INIT_NETENT;
 
 #if SANITIZER_NETBSD
   COMMON_INTERCEPT_FUNCTION(__libc_mutex_lock);