linux-kernel - Re: [PATCH bpf-next 1/2] bpftool: Use strcmp() instead of is

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Message-ID: <Y3J6AXOFcoGg7p8/@google.com>
Date:   Mon, 14 Nov 2022 09:25:21 -0800
From:   sdf@...gle.com
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Quentin Monnet <quentin@...valent.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/2] bpftool: Use strcmp() instead of is_prefix()
 to check parameters

On 11/14, Tiezhu Yang wrote:
> In the current code, the parameters check of bpftool seems not correct,
> for example, "bpftool batch file FILE" is the expected command format,
> but "bpftool b f FILE" is recognized as valid, so use strcmp() instead
> of is_prefix() to check parameters.

That's by design and is similar to what iproute2 commands are doing.

> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>   tools/bpf/bpftool/main.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)

> diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
> index 741e50e..4ef87c2 100644
> --- a/tools/bpf/bpftool/main.c
> +++ b/tools/bpf/bpftool/main.c
> @@ -200,7 +200,7 @@ int cmd_select(const struct cmd *cmds, int argc, char  
> **argv,
>   		return cmds[0].func(argc, argv);

>   	for (i = 0; cmds[i].cmd; i++) {
> -		if (is_prefix(*argv, cmds[i].cmd)) {
> +		if (!strcmp(*argv, cmds[i].cmd)) {
>   			if (!cmds[i].func) {
>   				p_err("command '%s' is not supported in bootstrap mode",
>   				      cmds[i].cmd);
> @@ -337,7 +337,7 @@ static int do_batch(int argc, char **argv)
>   	if (argc < 2) {
>   		p_err("too few parameters for batch");
>   		return -1;
> -	} else if (!is_prefix(*argv, "file")) {
> +	} else if (strcmp(*argv, "file")) {
>   		p_err("expected 'file', got: %s", *argv);
>   		return -1;
>   	} else if (argc > 2) {
> --
> 2.1.0