From 602d70a9162bf2dc830142755836e82469230c5c Mon Sep 17 00:00:00 2001 From: Florian Forster Date: Tue, 30 Dec 2008 14:44:39 +0100 Subject: [PATCH] network plugin: Fix an invalid size of buffer being used. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When specifying the amount of data to copy, we used `sizeof (buffer)' where `buffer' is a pointer, giving 4 or 8 bytes, depending on the architecture (and not depending on the actual buffer size). This results in the `type' being sent much more often than necessary and sometimes not sending a new type when is was actually necessary. The only prominent case in the default configuration(s) was `cpufreq' being used instead of `cpu', though. While in the process, the global `type' buffer was replaced, because an appropriate buffer is in `value_list_t' now. Much thanks to Bruno Prémont for reporting and debugging this issue :) References: #37 --- src/network.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/src/network.c b/src/network.c index fbbcd122..9e391bb2 100644 --- a/src/network.c +++ b/src/network.c @@ -178,7 +178,6 @@ static char send_buffer[BUFF_SIZE]; static char *send_buffer_ptr; static int send_buffer_fill; static value_list_t send_buffer_vl = VALUE_LIST_STATIC; -static char send_buffer_type[DATA_MAX_NAME_LEN]; static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER; static c_avl_tree_t *cache_tree = NULL; @@ -1393,7 +1392,7 @@ static void network_send_buffer (const char *buffer, int buffer_len) } /* void network_send_buffer */ static int add_to_buffer (char *buffer, int buffer_size, - value_list_t *vl_def, char *type_def, + value_list_t *vl_def, const data_set_t *ds, const value_list_t *vl) { char *buffer_orig = buffer; @@ -1439,12 +1438,12 @@ static int add_to_buffer (char *buffer, int buffer_size, sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance)); } - if (strcmp (type_def, vl->type) != 0) + if (strcmp (vl_def->type, vl->type) != 0) { if (write_part_string (&buffer, &buffer_size, TYPE_TYPE, vl->type, strlen (vl->type)) != 0) return (-1); - sstrncpy (type_def, vl->type, sizeof (type_def)); + sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type)); } if (strcmp (vl_def->type_instance, vl->type_instance) != 0) @@ -1470,8 +1469,7 @@ static void flush_buffer (void) network_send_buffer (send_buffer, send_buffer_fill); send_buffer_ptr = send_buffer; send_buffer_fill = 0; - memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl)); - memset (send_buffer_type, '\0', sizeof (send_buffer_type)); + memset (&send_buffer_vl, 0, sizeof (send_buffer_vl)); } static int network_write (const data_set_t *ds, const value_list_t *vl) @@ -1490,7 +1488,7 @@ static int network_write (const data_set_t *ds, const value_list_t *vl) status = add_to_buffer (send_buffer_ptr, sizeof (send_buffer) - send_buffer_fill, - &send_buffer_vl, send_buffer_type, + &send_buffer_vl, ds, vl); if (status >= 0) { @@ -1504,7 +1502,7 @@ static int network_write (const data_set_t *ds, const value_list_t *vl) status = add_to_buffer (send_buffer_ptr, sizeof (send_buffer) - send_buffer_fill, - &send_buffer_vl, send_buffer_type, + &send_buffer_vl, ds, vl); if (status >= 0) @@ -1726,8 +1724,7 @@ static int network_init (void) send_buffer_ptr = send_buffer; send_buffer_fill = 0; - memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl)); - memset (send_buffer_type, '\0', sizeof (send_buffer_type)); + memset (&send_buffer_vl, 0, sizeof (send_buffer_vl)); cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp); cache_flush_last = time (NULL); -- 2.30.2