MINOR: log: add dup_logsrv() helper function

ease code maintenance by introducing dup_logsrv() helper function to
properly duplicate an existing logsrv struct.

include/haproxy/log.h

@@ -87,6 +87,7 @@ int add_to_logformat_list(char *start, char *end, int type, struct list *list_fo
  */
 int parse_logformat_string(const char *str, struct proxy *curproxy, struct list *list_format, int options, int cap, char **err);
 
+struct logsrv *dup_logsrv(struct logsrv *def);
 void free_logsrv(struct logsrv *logsrv);
 
 /* Parse "log" keyword and update the linked list. */

src/http_client.c

@@ -1369,19 +1369,14 @@ static int httpclient_postcheck_proxy(struct proxy *curproxy)
 
 	/* copy logs from "global" log list */
 	list_for_each_entry(logsrv, &global.logsrvs, list) {
-		struct logsrv *node = malloc(sizeof(*node));
+		struct logsrv *node = dup_logsrv(logsrv);
 
 		if (!node) {
 			memprintf(&errmsg, "out of memory.");
 			err_code |= ERR_ALERT | ERR_FATAL;
 			goto err;
 		}
-
-		memcpy(node, logsrv, sizeof(*node));
-		LIST_INIT(&node->list);
 		LIST_APPEND(&curproxy->logsrvs, &node->list);
-		node->ring_name = logsrv->ring_name ? strdup(logsrv->ring_name) : NULL;
-		node->conf.file = logsrv->conf.file ? strdup(logsrv->conf.file) : NULL;
 	}
 	if (curproxy->conf.logformat_string) {
 		curproxy->conf.args.ctx = ARGC_LOG;

src/log.c

@@ -734,6 +734,43 @@ int smp_log_range_cmp(const void *a, const void *b)
 	return 0;
 }
 
+/* tries to duplicate <def> logsrv
+ *
+ * Returns the newly allocated and duplicated logsrv or NULL
+ * in case of error.
+ */
+struct logsrv *dup_logsrv(struct logsrv *def)
+{
+	struct logsrv *cpy = malloc(sizeof(*cpy));
+
+	/* copy everything that can be easily copied */
+	memcpy(cpy, def, sizeof(*cpy));
+
+	/* default values */
+	cpy->ring_name = NULL;
+	cpy->conf.file = NULL;
+	LIST_INIT(&cpy->list);
+	HA_SPIN_INIT(&cpy->lock);
+
+	/* special members */
+	if (def->ring_name) {
+		cpy->ring_name = strdup(def->ring_name);
+		if (!cpy->ring_name)
+			goto error;
+	}
+	if (def->conf.file) {
+		cpy->conf.file = strdup(def->conf.file);
+		if (!cpy->conf.file)
+			goto error;
+	}
+	cpy->ref = def;
+	return cpy;
+
+ error:
+	free_logsrv(cpy);
+	return NULL;
+}
+
 /* frees log server <logsrv> after freeing all of its allocated fields. The
  * server must not belong to a list anymore. Logsrv may be NULL, which is
  * silently ignored.
@@ -808,19 +845,21 @@ int parse_logsrv(char **args, struct list *logsrvs, int do_del, const char *file
 					goto skip_logsrv;
 			}
 
-			node = malloc(sizeof(*node));
+			/* duplicate logsrv from global */
+			node = dup_logsrv(logsrv);
 			if (!node) {
 				memprintf(err, "out of memory error");
 				goto error;
 			}
-			memcpy(node, logsrv, sizeof(struct logsrv));
-			node->ref = logsrv;
-			LIST_INIT(&node->list);
-			LIST_APPEND(logsrvs, &node->list);
-			node->ring_name = logsrv->ring_name ? strdup(logsrv->ring_name) : NULL;
+
+			/* manually override some values */
+			ha_free(&node->conf.file);
 			node->conf.file = strdup(file);
 			node->conf.line = linenum;
 
+			/* add to list */
+			LIST_APPEND(logsrvs, &node->list);
+
 		  skip_logsrv:
 			continue;
 		}

src/proxy.c

@@ -1814,19 +1814,13 @@ static int proxy_defproxy_cpy(struct proxy *curproxy, const struct proxy *defpro
 
 	/* copy default logsrvs to curproxy */
 	list_for_each_entry(tmplogsrv, &defproxy->logsrvs, list) {
-		struct logsrv *node = malloc(sizeof(*node));
+		struct logsrv *node = dup_logsrv(tmplogsrv);
 
 		if (!node) {
 			memprintf(errmsg, "proxy '%s': out of memory", curproxy->id);
 			return 1;
 		}
-		memcpy(node, tmplogsrv, sizeof(struct logsrv));
-		node->ref = tmplogsrv->ref;
-		LIST_INIT(&node->list);
 		LIST_APPEND(&curproxy->logsrvs, &node->list);
-		node->ring_name = tmplogsrv->ring_name ? strdup(tmplogsrv->ring_name) : NULL;
-		node->conf.file = strdup(tmplogsrv->conf.file);
-		node->conf.line = tmplogsrv->conf.line;
 	}
 
 	curproxy->conf.uniqueid_format_string = defproxy->conf.uniqueid_format_string;