* nis/nss_nis/nis-spwd.c (internal_nis_getspent_r): Remove data

	variable.

	* nis/nss-nis.h: Define response_t and intern_t.  Declare _nis_saveit.
	* nis/nss_nis/nis-pwd.c: Remove response_t and intern_t definition.
	(saveit): Renamed to _nis_saveit.  Take parameter which is pointer
	to the intern_t object.  Change all users.
	* nis/nss_nis/nis-grp.c: Remove response_t, intern_t, and saveit
	definition.  Use _nis_saveit instead of saveit.
	* nis/nss_nis/nis-service.c: Likewise.
	* nis/nss_nis/nis-initgroups.c: Likewise.
	(internal_setgrent): Adjust for buffer handling.
	(internal_getgrent_r): Likewise.
	* nis/nss_nis/nis-rpc.c: Likewise.

6 files changed, 118 insertions, 289 deletions

diff --git a/nis/nss_nis/nis-grp.c b/nis/nss_nis/nis-grp.c
index 10af019492..ce642c484f 100644
--- a/nis/nss_nis/nis-grp.c
+++ b/nis/nss_nis/nis-grp.c
@@ -41,82 +41,9 @@ __libc_lock_define_initialized (static, lock)
 static bool_t new_start = 1;
 static char *oldkey;
 static int oldkeylen;
-
-struct response_t
-{
-  struct response_t *next;
-  size_t size;
-  char mem[0];
-};
-
-typedef struct intern_t
-{
-  struct response_t *start;
-  struct response_t *next;
-  size_t offset;
-} intern_t;
-
 static intern_t intern;
 
 
-static int
-saveit (int instatus, char *inkey, int inkeylen, char *inval,
-        int invallen, char *indata)
-{
-  if (instatus != YP_TRUE)
-    return 1;
-
-  if (inkey && inkeylen > 0 && inval && invallen > 0)
-    {
-      struct response_t *bucket = intern.next;
-
-      if (__builtin_expect (bucket == NULL, 0))
-	{
-#define MINSIZE 4096 - 4 * sizeof (void *)
-	  const size_t minsize = MAX (MINSIZE, 2 * (invallen + 1));
-	  bucket = malloc (sizeof (struct response_t) + minsize);
-	  if (bucket == NULL)
-	    /* We have no error code for out of memory.  */
-	    return 1;
-
-	  bucket->next = NULL;
-	  bucket->size = minsize;
-	  intern.start = intern.next = bucket;
-	  intern.offset = 0;
-	}
-      else if (__builtin_expect (invallen + 1 > bucket->size - intern.offset,
-				 0))
-	{
-	  /* We need a new (larger) buffer.  */
-	  const size_t newsize = 2 * MAX (bucket->size, invallen + 1);
-	  struct response_t *newp = malloc (sizeof (struct response_t)
-					    + newsize);
-	  if (newp == NULL)
-	    /* We have no error code for out of memory.  */
-	    return 1;
-
-	  /* Mark the old bucket as full.  */
-	  bucket->size = intern.offset;
-
-	  newp->next = NULL;
-	  newp->size = newsize;
-	  bucket = intern.next = bucket->next = newp;
-	  intern.offset = 0;
-	}
-
-      char *p = mempcpy (&bucket->mem[intern.offset], inval, invallen);
-      if (__builtin_expect (p[-1] != '\0', 0))
-	{
-	  *p = '\0';
-	  ++invallen;
-	}
-      intern.offset += invallen;
-    }
-
-  return 0;
-}
-
-
 static void
 internal_nis_endgrent (void)
 {
@@ -164,8 +91,8 @@ internal_nis_setgrent (void)
 
   struct ypall_callback ypcb;
 
-  ypcb.foreach = saveit;
-  ypcb.data = NULL;
+  ypcb.foreach = _nis_saveit;
+  ypcb.data = (char *) &intern;
   enum nss_status status = yperr2nss (yp_all (domain, "group.byname", &ypcb));
 
 
diff --git a/nis/nss_nis/nis-initgroups.c b/nis/nss_nis/nis-initgroups.c
index 647adf5119..a5a3ba6144 100644
--- a/nis/nss_nis/nis-initgroups.c
+++ b/nis/nss_nis/nis-initgroups.c
@@ -38,47 +38,6 @@
 #define EXTERN_PARSER
 #include <nss/nss_files/files-parse.c>
 
-struct response_t
-{
-  struct response_t *next;
-  char val[0];
-};
-
-struct intern_t
-{
-  struct response_t *start;
-  struct response_t *next;
-};
-typedef struct intern_t intern_t;
-
-static int
-saveit (int instatus, char *inkey, int inkeylen, char *inval,
-        int invallen, char *indata)
-{
-  intern_t *intern = (intern_t *) indata;
-
-  if (instatus != YP_TRUE)
-    return 1;
-
-  if (inkey && inkeylen > 0 && inval && invallen > 0)
-    {
-      struct response_t *newp = malloc (sizeof (struct response_t)
-					+ invallen + 1);
-      if (newp == NULL)
-	return 1; /* We have no error code for out of memory */
-
-      if (intern->start == NULL)
-	intern->start = newp;
-      else
-	intern->next->next = newp;
-      intern->next = newp;
-
-      newp->next = NULL;
-      *((char *) mempcpy (newp->val, inval, invallen)) = '\0';
-    }
-
-  return 0;
-}
 
 static enum nss_status
 internal_setgrent (char *domainname, intern_t *intern)
@@ -86,16 +45,21 @@ internal_setgrent (char *domainname, intern_t *intern)
   struct ypall_callback ypcb;
   enum nss_status status;
 
-  intern->start = NULL;
-
-  ypcb.foreach = saveit;
+  ypcb.foreach = _nis_saveit;
   ypcb.data = (char *) intern;
   status = yperr2nss (yp_all (domainname, "group.byname", &ypcb));
+
+  /* Mark the last buffer as full.  */
+  if (intern->next != NULL)
+    intern->next->size = intern->offset;
+
   intern->next = intern->start;
+  intern->offset = 0;
 
   return status;
 }
 
+
 static enum nss_status
 internal_getgrent_r (struct group *grp, char *buffer, size_t buflen,
 		     int *errnop, intern_t *intern)
@@ -107,18 +71,46 @@ internal_getgrent_r (struct group *grp, char *buffer, size_t buflen,
   int parse_res;
   do
     {
-      if (intern->next == NULL)
-	return NSS_STATUS_NOTFOUND;
+      struct response_t *bucket = intern->next;
+
+      if (__builtin_expect (intern->offset >= bucket->size, 0))
+	{
+	  if (bucket->next == NULL)
+	    return NSS_STATUS_NOTFOUND;
+
+	  /* We look at all the content in the current bucket.  Go on
+	     to the next.  */
+	  bucket = intern->next = bucket->next;
+	  intern->offset = 0;
+	}
 
-      char *p = strncpy (buffer, intern->next->val, buflen);
-      while (isspace (*p))
-        ++p;
+      char *p;
+      for (p = &bucket->mem[intern->offset]; isspace (*p); ++p)
+        ++intern->offset;
+
+      size_t len = strlen (p) + 1;
+      if (__builtin_expect (len > buflen, 0))
+	{
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+
+      /* We unfortunately have to copy the data in the user-provided
+	 buffer because that buffer might be around for a very long
+	 time and the servent structure must remain valid.  If we would
+	 rely on the BUCKET memory the next 'setservent' or 'endservent'
+	 call would destroy it.
+
+	 The important thing is that it is a single NUL-terminated
+	 string.  This is what the parsing routine expects.  */
+      p = memcpy (buffer, &bucket->mem[intern->offset], len);
 
       parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 					  errnop);
       if (__builtin_expect (parse_res == -1, 0))
         return NSS_STATUS_TRYAGAIN;
-      intern->next = intern->next->next;
+
+      intern->offset += len;
     }
   while (!parse_res);
 
@@ -259,7 +251,7 @@ _nss_nis_initgroups_dyn (const char *user, gid_t group, long int *start,
   size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
   char *tmpbuf;
   enum nss_status status;
-  intern_t intern = { NULL, NULL };
+  intern_t intern = { NULL, NULL, 0 };
   gid_t *groups = *groupsp;
 
   status = internal_setgrent (domainname, &intern);
diff --git a/nis/nss_nis/nis-pwd.c b/nis/nss_nis/nis-pwd.c
index a996b042c4..7972118c84 100644
--- a/nis/nss_nis/nis-pwd.c
+++ b/nis/nss_nis/nis-pwd.c
@@ -42,34 +42,21 @@ __libc_lock_define_initialized (static, lock)
 static bool_t new_start = 1;
 static char *oldkey;
 static int oldkeylen;
-
-struct response_t
-{
-  struct response_t *next;
-  size_t size;
-  char mem[0];
-};
-
-typedef struct intern_t
-{
-  struct response_t *start;
-  struct response_t *next;
-  size_t offset;
-} intern_t;
-
 static intern_t intern;
 
 
-static int
-saveit (int instatus, char *inkey, int inkeylen, char *inval,
-        int invallen, char *indata)
+int
+_nis_saveit (int instatus, char *inkey, int inkeylen, char *inval,
+	     int invallen, char *indata)
 {
+  intern_t *intern = (intern_t *) indata;
+
   if (instatus != YP_TRUE)
     return 1;
 
   if (inkey && inkeylen > 0 && inval && invallen > 0)
     {
-      struct response_t *bucket = intern.next;
+      struct response_t *bucket = intern->next;
 
       if (__builtin_expect (bucket == NULL, 0))
 	{
@@ -82,10 +69,10 @@ saveit (int instatus, char *inkey, int inkeylen, char *inval,
 
 	  bucket->next = NULL;
 	  bucket->size = minsize;
-	  intern.start = intern.next = bucket;
-	  intern.offset = 0;
+	  intern->start = intern->next = bucket;
+	  intern->offset = 0;
 	}
-      else if (__builtin_expect (invallen + 1 > bucket->size - intern.offset,
+      else if (__builtin_expect (invallen + 1 > bucket->size - intern->offset,
 				 0))
 	{
 	  /* We need a new (larger) buffer.  */
@@ -97,21 +84,21 @@ saveit (int instatus, char *inkey, int inkeylen, char *inval,
 	    return 1;
 
 	  /* Mark the old bucket as full.  */
-	  bucket->size = intern.offset;
+	  bucket->size = intern->offset;
 
 	  newp->next = NULL;
 	  newp->size = newsize;
-	  bucket = intern.next = bucket->next = newp;
-	  intern.offset = 0;
+	  bucket = intern->next = bucket->next = newp;
+	  intern->offset = 0;
 	}
 
-      char *p = mempcpy (&bucket->mem[intern.offset], inval, invallen);
+      char *p = mempcpy (&bucket->mem[intern->offset], inval, invallen);
       if (__builtin_expect (p[-1] != '\0', 0))
 	{
 	  *p = '\0';
 	  ++invallen;
 	}
-      intern.offset += invallen;
+      intern->offset += invallen;
     }
 
   return 0;
@@ -165,8 +152,8 @@ internal_nis_setpwent (void)
 
   struct ypall_callback ypcb;
 
-  ypcb.foreach = saveit;
-  ypcb.data = NULL;
+  ypcb.foreach = _nis_saveit;
+  ypcb.data = (char *) &intern;
   enum nss_status status = yperr2nss (yp_all (domain, "passwd.byname", &ypcb));
 
 
diff --git a/nis/nss_nis/nis-rpc.c b/nis/nss_nis/nis-rpc.c
index 162f3572bf..e7049ffa9f 100644
--- a/nis/nss_nis/nis-rpc.c
+++ b/nis/nss_nis/nis-rpc.c
@@ -36,59 +36,22 @@
 
 __libc_lock_define_initialized (static, lock)
 
-struct response_t
-{
-  struct response_t *next;
-  char val[0];
-};
-
-struct intern_t
-{
-  struct response_t *start;
-  struct response_t *next;
-};
-typedef struct intern_t intern_t;
-
-static intern_t intern = {NULL, NULL};
+static intern_t intern;
 
-static int
-saveit (int instatus, char *inkey, int inkeylen, char *inval,
-        int invallen, char *indata)
-{
-  intern_t *intern = (intern_t *) indata;
-
-  if (instatus != YP_TRUE)
-    return 1;
-
-  if (inkey && inkeylen > 0 && inval && invallen > 0)
-    {
-      struct response_t *newp = malloc (sizeof (struct response_t)
-					+ invallen + 1);
-      if (newp == NULL)
-	return 1; /* We have no error code for out of memory */
-
-      if (intern->start == NULL)
-	intern->start = newp;
-      else
-	intern->next->next = newp;
-      intern->next = newp;
-
-      newp->next = NULL;
-      *((char *) mempcpy (newp->val, inval, invallen)) = '\0';
-    }
-
-  return 0;
-}
 
 static void
 internal_nis_endrpcent (intern_t *intern)
 {
-  while (intern->start != NULL)
+  struct response_t *curr = intern->next;
+
+  while (curr != NULL)
     {
-      intern->next = intern->start;
-      intern->start = intern->start->next;
-      free (intern->next);
+      struct response_t *last = curr;
+      curr = curr->next;
+      free (last);
     }
+
+  intern->next = intern->start = NULL;
 }
 
 static enum nss_status
@@ -103,10 +66,16 @@ internal_nis_setrpcent (intern_t *intern)
 
   internal_nis_endrpcent (intern);
 
-  ypcb.foreach = saveit;
-  ypcb.data = (char *)intern;
-  status = yperr2nss (yp_all(domainname, "rpc.bynumber", &ypcb));
+  ypcb.foreach = _nis_saveit;
+  ypcb.data = (char *) intern;
+  status = yperr2nss (yp_all (domainname, "rpc.bynumber", &ypcb));
+
+  /* Mark the last buffer as full.  */
+  if (intern->next != NULL)
+    intern->next->size = intern->offset;
+
   intern->next = intern->start;
+  intern->offset = 0;
 
   return status;
 }
@@ -139,29 +108,56 @@ _nss_nis_endrpcent (void)
 
 static enum nss_status
 internal_nis_getrpcent_r (struct rpcent *rpc, char *buffer, size_t buflen,
-			  int *errnop, intern_t *data)
+			  int *errnop, intern_t *intern)
 {
   struct parser_data *pdata = (void *) buffer;
   int parse_res;
   char *p;
 
-  if (data->start == NULL)
-    internal_nis_setrpcent (data);
+  if (intern->start == NULL)
+    internal_nis_setrpcent (intern);
 
   /* Get the next entry until we found a correct one. */
   do
     {
-      if (data->next == NULL)
-	return NSS_STATUS_NOTFOUND;
+      struct response_t *bucket = intern->next;
+
+      if (__builtin_expect (intern->offset >= bucket->size, 0))
+	{
+	  if (bucket->next == NULL)
+	    return NSS_STATUS_NOTFOUND;
+
+	  /* We look at all the content in the current bucket.  Go on
+	     to the next.  */
+	  bucket = intern->next = bucket->next;
+	  intern->offset = 0;
+	}
+
+      for (p = &bucket->mem[intern->offset]; isspace (*p); ++p)
+        ++intern->offset;
 
-      p = strncpy (buffer, data->next->val, buflen);
-      while (isspace (*p))
-        ++p;
+      size_t len = strlen (p) + 1;
+      if (__builtin_expect (len > buflen, 0))
+	{
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+
+      /* We unfortunately have to copy the data in the user-provided
+	 buffer because that buffer might be around for a very long
+	 time and the servent structure must remain valid.  If we would
+	 rely on the BUCKET memory the next 'setservent' or 'endservent'
+	 call would destroy it.
+
+	 The important thing is that it is a single NUL-terminated
+	 string.  This is what the parsing routine expects.  */
+      p = memcpy (buffer, &bucket->mem[intern->offset], len);
 
       parse_res = _nss_files_parse_rpcent (p, rpc, pdata, buflen, errnop);
       if (__builtin_expect (parse_res == -1, 0))
 	return NSS_STATUS_TRYAGAIN;
-      data->next = data->next->next;
+
+      intern->offset += len;
     }
   while (!parse_res);
 
@@ -193,7 +189,7 @@ _nss_nis_getrpcbyname_r (const char *name, struct rpcent *rpc,
       return NSS_STATUS_UNAVAIL;
     }
 
-  intern_t data = { NULL, NULL };
+  intern_t data = { NULL, NULL, 0 };
   enum nss_status status = internal_nis_setrpcent (&data);
   if (__builtin_expect (status != NSS_STATUS_SUCCESS, 0))
     return status;
diff --git a/nis/nss_nis/nis-service.c b/nis/nss_nis/nis-service.c
index f705ff77cf..cb728335f9 100644
--- a/nis/nss_nis/nis-service.c
+++ b/nis/nss_nis/nis-service.c
@@ -37,20 +37,6 @@
 
 __libc_lock_define_initialized (static, lock)
 
-struct response_t
-{
-  struct response_t *next;
-  size_t size;
-  char mem[0];
-};
-
-typedef struct intern_t
-{
-  struct response_t *start;
-  struct response_t *next;
-  size_t offset;
-} intern_t;
-
 static intern_t intern;
 
 struct search_t
@@ -66,63 +52,6 @@ struct search_t
 };
 
 static int
-saveit (int instatus, char *inkey, int inkeylen, char *inval,
-        int invallen, char *indata)
-{
-  if (instatus != YP_TRUE)
-    return 1;
-
-  if (inkey && inkeylen > 0 && inval && invallen > 0)
-    {
-      struct response_t *bucket = intern.next;
-
-      if (__builtin_expect (bucket == NULL, 0))
-	{
-#define MINSIZE 4096 - 4 * sizeof (void *)
-	  const size_t minsize = MAX (MINSIZE, 2 * (invallen + 1));
-	  bucket = malloc (sizeof (struct response_t) + minsize);
-	  if (bucket == NULL)
-	    /* We have no error code for out of memory.  */
-	    return 1;
-
-	  bucket->next = NULL;
-	  bucket->size = minsize;
-	  intern.start = intern.next = bucket;
-	  intern.offset = 0;
-	}
-      else if (__builtin_expect (invallen + 1 > bucket->size - intern.offset,
-				 0))
-	{
-	  /* We need a new (larger) buffer.  */
-	  const size_t newsize = 2 * MAX (bucket->size, invallen + 1);
-	  struct response_t *newp = malloc (sizeof (struct response_t)
-					    + newsize);
-	  if (newp == NULL)
-	    /* We have no error code for out of memory.  */
-	    return 1;
-
-	  /* Mark the old bucket as full.  */
-	  bucket->size = intern.offset;
-
-	  newp->next = NULL;
-	  newp->size = newsize;
-	  bucket = intern.next = bucket->next = newp;
-	  intern.offset = 0;
-	}
-
-      char *p = mempcpy (&bucket->mem[intern.offset], inval, invallen);
-      if (__builtin_expect (p[-1] != '\0', 0))
-	{
-	  *p = '\0';
-	  ++invallen;
-	}
-      intern.offset += invallen;
-    }
-
-  return 0;
-}
-
-static int
 dosearch (int instatus, char *inkey, int inkeylen, char *inval,
 	  int invallen, char *indata)
 {
@@ -220,8 +149,8 @@ internal_nis_setservent (void)
 
   internal_nis_endservent ();
 
-  ypcb.foreach = saveit;
-  ypcb.data = NULL;
+  ypcb.foreach = _nis_saveit;
+  ypcb.data = (char *) &intern;
   status = yperr2nss (yp_all (domainname, "services.byname", &ypcb));
 
   /* Mark the last buffer as full.  */
diff --git a/nis/nss_nis/nis-spwd.c b/nis/nss_nis/nis-spwd.c
index 820bfb25e5..0fc4e17c42 100644
--- a/nis/nss_nis/nis-spwd.c
+++ b/nis/nss_nis/nis-spwd.c
@@ -68,8 +68,6 @@ static enum nss_status
 internal_nis_getspent_r (struct spwd *sp, char *buffer, size_t buflen,
 			 int *errnop)
 {
-  struct parser_data *data = (void *) buffer;
-
   char *domain;
   if (__builtin_expect (yp_get_default_domain (&domain), 0))
     return NSS_STATUS_UNAVAIL;