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Date: Tue, 17 Mar 2015 15:41:06 +0200
From: Vadim Kochan <vadim4j@...il.com>
To: netdev@...r.kernel.org
Cc: daniel@...earbox.net, Vadim Kochan <vadim4j@...il.com>
Subject: [PATCH iproute2] tc class: Don't fail if there is no default names file
From: Vadim Kochan <vadim4j@...il.com>
Added the following changes in one patch:
1) Split db_names_init into alloc & load funcs
2) Added checks for out of memory with new alloc helpers
3) Ignore if there is no default class names file
3) Changed default class names path cls_names -> tc_cls
Signed-off-by: Vadim Kochan <vadim4j@...il.com>
---
include/names.h | 3 ++-
include/utils.h | 4 ++++
lib/names.c | 69 +++++++++++++++++++++++++++++++++++++++------------------
lib/utils.c | 26 ++++++++++++++++++++++
tc/tc_util.c | 19 ++++++++++++----
5 files changed, 95 insertions(+), 26 deletions(-)
diff --git a/include/names.h b/include/names.h
index 4123d0b..6fed581 100644
--- a/include/names.h
+++ b/include/names.h
@@ -16,7 +16,8 @@ struct db_names {
int max;
};
-struct db_names *db_names_alloc(const char *path);
+struct db_names *db_names_alloc(void);
+int db_names_load(struct db_names *db, const char *path);
void db_names_free(struct db_names *db);
char *id_to_name(struct db_names *db, int id, char *name);
diff --git a/include/utils.h b/include/utils.h
index 9151c4f..4bb1bf0 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -172,4 +172,8 @@ extern int do_each_netns(int (*func)(char *nsname, void *arg), void *arg,
char *int_to_str(int val, char *buf);
+void *xmalloc(size_t size);
+void xfree(void *ptr);
+char *xstrdup(char *str);
+
#endif /* __UTILS_H__ */
diff --git a/lib/names.c b/lib/names.c
index 93933f7..63f1b9a 100644
--- a/lib/names.c
+++ b/lib/names.c
@@ -11,8 +11,10 @@
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
+#include <errno.h>
#include "names.h"
+#include "utils.h"
#define MAX_ENTRIES 256
#define NAME_MAX_LEN 512
@@ -48,48 +50,65 @@ static int read_id_name(FILE *fp, int *id, char *name)
return 0;
}
-struct db_names *db_names_alloc(const char *path)
+struct db_names *db_names_alloc(void)
{
struct db_names *db;
- struct db_entry *entry;
- FILE *fp;
- int id;
- char namebuf[NAME_MAX_LEN] = {0};
- int ret;
- fp = fopen(path, "r");
- if (!fp) {
- fprintf(stderr, "Can't open file: %s\n", path);
+ db = xmalloc(sizeof(*db));
+ if (!db)
return NULL;
- }
- db = malloc(sizeof(*db));
memset(db, 0, sizeof(*db));
db->size = MAX_ENTRIES;
db->hash = malloc(sizeof(struct db_entry *) * db->size);
memset(db->hash, 0, sizeof(struct db_entry *) * db->size);
+ return db;
+}
+
+int db_names_load(struct db_names *db, const char *path)
+{
+ struct db_entry *entry;
+ FILE *fp;
+ int id;
+ char namebuf[NAME_MAX_LEN] = {0};
+ int ret = -1;
+
+ fp = fopen(path, "r");
+ if (!fp)
+ return -ENOENT;
+
while ((ret = read_id_name(fp, &id, &namebuf[0]))) {
if (ret == -1) {
fprintf(stderr, "Database %s is corrupted at %s\n",
path, namebuf);
- fclose(fp);
- return NULL;
+ goto Exit;
}
+ ret = -1;
if (id < 0)
continue;
- entry = malloc(sizeof(*entry));
+ entry = xmalloc(sizeof(*entry));
+ if (!entry)
+ goto Exit;
+
+ entry->name = xstrdup(namebuf);
+ if (!entry->name) {
+ xfree(entry);
+ goto Exit;
+ }
+
entry->id = id;
- entry->name = strdup(namebuf);
entry->next = db->hash[id & (db->size - 1)];
db->hash[id & (db->size - 1)] = entry;
}
+ ret = 0;
+Exit:
fclose(fp);
- return db;
+ return ret;
}
void db_names_free(struct db_names *db)
@@ -105,20 +124,24 @@ void db_names_free(struct db_names *db)
while (entry) {
struct db_entry *next = entry->next;
- free(entry->name);
- free(entry);
+ xfree(entry->name);
+ xfree(entry);
entry = next;
}
}
- free(db->hash);
- free(db);
+ xfree(db->hash);
+ xfree(db);
}
char *id_to_name(struct db_names *db, int id, char *name)
{
- struct db_entry *entry = db->hash[id & (db->size - 1)];
+ struct db_entry *entry;
+
+ if (!db)
+ return NULL;
+ entry = db->hash[id & (db->size - 1)];
while (entry && entry->id != id)
entry = entry->next;
@@ -136,6 +159,9 @@ int name_to_id(struct db_names *db, int *id, const char *name)
struct db_entry *entry;
int i;
+ if (!db)
+ return -1;
+
if (db->cached && strcmp(db->cached->name, name) == 0) {
*id = db->cached->id;
return 0;
@@ -145,6 +171,7 @@ int name_to_id(struct db_names *db, int *id, const char *name)
entry = db->hash[i];
while (entry && strcmp(entry->name, name))
entry = entry->next;
+
if (entry) {
db->cached = entry;
*id = entry->id;
diff --git a/lib/utils.c b/lib/utils.c
index 9cda268..d119a69 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -904,3 +904,29 @@ char *int_to_str(int val, char *buf)
sprintf(buf, "%d", val);
return buf;
}
+
+void *xmalloc(size_t size)
+{
+ void *ptr = malloc(size);
+ if (!ptr)
+ fprintf(stderr, "xmalloc: Out of memory\n");
+
+ return ptr;
+}
+
+void xfree(void *ptr)
+{
+ if (!ptr)
+ fprintf(stderr, "xfree: ptr is NULL\n");
+ else
+ free(ptr);
+}
+
+char *xstrdup(char *str)
+{
+ char *ptr = strdup(str);
+ if (!ptr)
+ fprintf(stderr, "xstrdup: Out of memory\n");
+
+ return ptr;
+}
diff --git a/tc/tc_util.c b/tc/tc_util.c
index feae439..5213e9e 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -21,6 +21,7 @@
#include <arpa/inet.h>
#include <string.h>
#include <math.h>
+#include <errno.h>
#include "utils.h"
#include "names.h"
@@ -33,15 +34,25 @@
static struct db_names *cls_names = NULL;
-#define NAMES_DB "/etc/iproute2/cls_names"
+#define NAMES_DB "/etc/iproute2/tc_cls"
int cls_names_init(char *path)
{
- cls_names = db_names_alloc(path ?: NAMES_DB);
- if (!cls_names) {
- fprintf(stderr, "Error while opening class names file\n");
+ int ret = -1;
+
+ cls_names = db_names_alloc();
+ if (!cls_names)
+ return -1;
+
+ ret = db_names_load(cls_names, path ?: NAMES_DB);
+ if (ret == -ENOENT && path) {
+ fprintf(stderr, "Can't open class names file: %s\n", path);
return -1;
}
+ if (ret) {
+ db_names_free(cls_names);
+ cls_names = NULL;
+ }
return 0;
}
--
2.3.1
--
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