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author | Krzesimir Nowak <krzesimir@kinvolk.io> | 2019-06-05 22:17:06 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-14 09:09:38 +0300 |
commit | 0493503b1e28a8d096d241903f338303b5c908c2 (patch) | |
tree | 3d494e133f28b4ec457892ff05dafdbea1471b4b /tools | |
parent | 53374b5aa7392edcdc67c33a75fce30d4d109916 (diff) | |
download | linux-0493503b1e28a8d096d241903f338303b5c908c2.tar.xz |
tools: bpftool: Fix JSON output when lookup fails
[ Upstream commit 1884c066579a7a274dd981a4d9639ca63db66a23 ]
In commit 9a5ab8bf1d6d ("tools: bpftool: turn err() and info() macros
into functions") one case of error reporting was special cased, so it
could report a lookup error for a specific key when dumping the map
element. What the code forgot to do is to wrap the key and value keys
into a JSON object, so an example output of pretty JSON dump of a
sockhash map (which does not support looking up its values) is:
[
"key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x00"
],
"value": {
"error": "Operation not supported"
},
"key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x01"
],
"value": {
"error": "Operation not supported"
}
]
Note the key-value pairs inside the toplevel array. They should be
wrapped inside a JSON object, otherwise it is an invalid JSON. This
commit fixes this, so the output now is:
[{
"key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x00"
],
"value": {
"error": "Operation not supported"
}
},{
"key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x01"
],
"value": {
"error": "Operation not supported"
}
}
]
Fixes: 9a5ab8bf1d6d ("tools: bpftool: turn err() and info() macros into functions")
Cc: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Krzesimir Nowak <krzesimir@kinvolk.io>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools')
-rw-r--r-- | tools/bpf/bpftool/map.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index 994a7e0d16fb..14f581b562bd 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -713,12 +713,14 @@ static int dump_map_elem(int fd, void *key, void *value, return 0; if (json_output) { + jsonw_start_object(json_wtr); jsonw_name(json_wtr, "key"); print_hex_data_json(key, map_info->key_size); jsonw_name(json_wtr, "value"); jsonw_start_object(json_wtr); jsonw_string_field(json_wtr, "error", strerror(lookup_errno)); jsonw_end_object(json_wtr); + jsonw_end_object(json_wtr); } else { if (errno == ENOENT) print_entry_plain(map_info, key, NULL); |