1 files changed, 58 insertions, 0 deletions
diff --git a/src/libnsss/nsss_switch_grp_read.c b/src/libnsss/nsss_switch_grp_read.c
new file mode 100644
index 0000000..6152484
--- /dev/null
+++ b/src/libnsss/nsss_switch_grp_read.c
@@ -0,0 +1,58 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <skalibs/posixplz.h>
+#include <skalibs/uint32.h>
+#include <skalibs/error.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/unix-timed.h>
+#include <nsss/grp-def.h>
+#include "nsss-switch-internal.h"
+
+/*
+   Expects:
+     4 bytes gr_gid
+     4 bytes total length of strings (including \0's)
+     4 bytes number of strings in gr_mem (n)
+     \0-terminated gr_name
+     \0-terminated gr_passwd
+     sequence of n \0-terminated elements in gr_mem
+*/
+
+int nsss_switch_grp_read (buffer *b, struct group *gr, stralloc *sa, genalloc *ga, tain_t const *deadline, tain_t *stamp)
+{
+  struct group grtmp ;
+  uint32_t total, len, n, x ;
+  char **q ;
+  char *p ;
+  char buf[12] ;
+  if (!buffer_timed_get(b, buf, 12, deadline, stamp)) return 0 ;
+  uint32_unpack_big(buf, &x) ; grtmp.gr_gid = x ;
+  uint32_unpack_big(buf + 4, &total) ;
+  uint32_unpack_big(buf + 8, &n) ;
+  if (n >= 0x30000000u) return (errno = EPROTO, 0) ;
+  if (!stralloc_readyplus(sa, total)) return 0 ;
+  if (!genalloc_readyplus(char *, ga, n+1)) return 0 ;
+  if (!buffer_timed_get(b, sa->s + sa->len, total, deadline, stamp)) return 0 ;
+  if (sa->s[sa->len + total - 1]) return (errno = EPROTO, 0) ;
+  p = sa->s + sa->len ; len = total ;
+  q = genalloc_s(char *, ga) + genalloc_len(char *, ga) ;
+  grtmp.gr_mem = q ;
+  grtmp.gr_name = p ; x = strnlen(p, len) + 1 ; p += x ; len -= x ;
+  if (!len) return (errno = EPROTO, 0) ;
+  grtmp.gr_passwd = p ; x = strnlen(p, len) + 1 ; p += x ; len -= x ;
+  for (uint32_t i = 0 ; i < n ; i++)
+  {
+    if (!len) return (errno = EPROTO, 0) ;
+    q[i] = p ; x = strnlen(p, len) + 1 ; p += x ; len -= x ;
+  }
+  if (len) return (errno = EPROTO, 0) ;
+  q[n] = 0 ;
+  sa->len += total ;
+  genalloc_setlen(char *, ga, genalloc_len(char *, ga) + n + 1) ;
+  *gr = grtmp ;
+  return 1 ;
+}