[PATCH 2/2] libtraceevent: Allow ipsa arg to use dynamic arrays

[Steven Rostedt <rostedt@xxxxxxxxxxx>]

As the print format of %pIS can handle different types of sockets that may
be of different sizes, a dynamic array may be used to save the socket
instead of a static field.

Allow %pIS to be used against a dynamic array.

Link: https://lore.kernel.org/all/164182978641.8391.8277203495236105391.stgit@xxxxxxxxxxxxxxxxxxxxxxx/

Reported-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 src/event-parse.c | 39 ++++++++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 13 deletions(-)

diff --git a/src/event-parse.c b/src/event-parse.c
index 5f3e2d8a6421..d3e43e5c11f8 100644
--- a/src/event-parse.c
+++ b/src/event-parse.c
@@ -5139,6 +5139,8 @@ static int print_ipsa_arg(struct trace_seq *s, const char *ptr, char i,
 	unsigned char *buf;
 	struct sockaddr_storage *sa;
 	bool reverse = false;
+	unsigned int offset;
+	unsigned int len;
 	int rc = 0;
 	int ret;
 
@@ -5168,27 +5170,38 @@ static int print_ipsa_arg(struct trace_seq *s, const char *ptr, char i,
 	while (arg->type == TEP_PRINT_TYPE)
 		arg = arg->typecast.item;
 
-	if (arg->type != TEP_PRINT_FIELD) {
-		trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
-		return rc;
-	}
+	if (arg->type == TEP_PRINT_FIELD) {
 
-	if (!arg->field.field) {
-		arg->field.field =
-			tep_find_any_field(event, arg->field.name);
 		if (!arg->field.field) {
-			do_warning("%s: field %s not found",
-				   __func__, arg->field.name);
-			return rc;
+			arg->field.field =
+				tep_find_any_field(event, arg->field.name);
+			if (!arg->field.field) {
+				do_warning("%s: field %s not found",
+					   __func__, arg->field.name);
+				return rc;
+			}
 		}
+
+		offset = arg->field.field->offset;
+		len = arg->field.field->size;
+
+	} else if (arg->type == TEP_PRINT_DYNAMIC_ARRAY) {
+
+		dynamic_offset_field(event->tep, arg->dynarray.field, data,
+				     size, &offset, &len);
+
+	} else {
+		trace_seq_printf(s, "ARG NOT FIELD NOR DYNAMIC ARRAY BUT TYPE %d",
+				 arg->type);
+		return rc;
 	}
 
-	sa = (struct sockaddr_storage *) (data + arg->field.field->offset);
+	sa = (struct sockaddr_storage *)(data + offset);
 
 	if (sa->ss_family == AF_INET) {
 		struct sockaddr_in *sa4 = (struct sockaddr_in *) sa;
 
-		if (arg->field.field->size < sizeof(struct sockaddr_in)) {
+		if (len < sizeof(struct sockaddr_in)) {
 			trace_seq_printf(s, "INVALIDIPv4");
 			return rc;
 		}
@@ -5201,7 +5214,7 @@ static int print_ipsa_arg(struct trace_seq *s, const char *ptr, char i,
 	} else if (sa->ss_family == AF_INET6) {
 		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) sa;
 
-		if (arg->field.field->size < sizeof(struct sockaddr_in6)) {
+		if (len < sizeof(struct sockaddr_in6)) {
 			trace_seq_printf(s, "INVALIDIPv6");
 			return rc;
 		}
-- 
2.33.0