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From 48c743edbd41470149a5ac58c350b47cb80fb9eb Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Wed, 24 Oct 2018 21:14:37 +0200
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Subject: [PATCH] json: Work around segfault when encountering xt stmt
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When trying to convert an xt stmt into JSON, print() callback was
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called. Though the code in src/xt.c does not respect output_fp,
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therefore buffer wasn't filled as expected making libjansson to puke:
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| # nft -j list ruleset
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| warning: stmt ops xt have no json callback
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| nft: json.c:169: stmt_print_json: Assertion `__out' failed.
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| Aborted (core dumped)
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Avoid this by detecting xt stmt ops and returning a stub.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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(cherry picked from commit b849b0dfd9f3aecff5617bc60d5852ef36c3d494)
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Conflicts:
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doc/libnftables-json.adoc
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-> Patches adding this man page are missing entirely.
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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src/json.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/src/json.c b/src/json.c
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index 98581a3c2a3e4..f74afd5a7292e 100644
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--- a/src/json.c
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+++ b/src/json.c
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@@ -165,6 +165,12 @@ static json_t *stmt_print_json(const struct stmt *stmt, struct output_ctx *octx)
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char buf[1024];
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FILE *fp;
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+ /* XXX: Can't be supported at this point:
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+ * xt_stmt_xlate() ignores output_fp.
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+ */
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+ if (stmt->ops->type == STMT_XT)
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+ return json_pack("{s:n}", "xt");
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+
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if (stmt->ops->json)
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return stmt->ops->json(stmt, octx);
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--
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2.19.0
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