diff options
| author | Krzesimir Nowak <krzesimir@kinvolk.io> | 2019-06-05 21:17:06 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-06-05 22:08:26 +0200 |
| commit | 1884c066579a7a274dd981a4d9639ca63db66a23 (patch) | |
| tree | 66b834a14dfd629e568522790454700216145692 /tools/bpf/bpftool/map.c | |
| parent | 25a7991c84f6cf68cd1ea2ed3ba5674fb9e8c8be (diff) | |
tools: bpftool: Fix JSON output when lookup fails
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>
Diffstat (limited to 'tools/bpf/bpftool/map.c')
| -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 3ec82904ccec..5da5a7311f13 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -716,12 +716,14 @@ 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 { const char *msg = NULL; |