From patchwork Tue Apr 20 08:26:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Ambardar X-Patchwork-Id: 425060 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 569ABC433ED for ; Tue, 20 Apr 2021 08:27:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B7126113C for ; Tue, 20 Apr 2021 08:27:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230486AbhDTI1a (ORCPT ); Tue, 20 Apr 2021 04:27:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230419AbhDTI1Y (ORCPT ); Tue, 20 Apr 2021 04:27:24 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 62DE9C061763 for ; Tue, 20 Apr 2021 01:26:52 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id 20so15321173pll.7 for ; Tue, 20 Apr 2021 01:26:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5zq9B3EYDFbItsI1htl3pZImVcLMnN3rRtR9X5rN4LI=; b=vRu9X+N8oA/eu/Tk966J1e8B8dAbIeLQdA0IGmAcbGr4L3qTc40QpHsyIaAKakbG1d RcWLtaUyxtporCkeXZpG0ecrzX9p7tn9XV/lc+lErCsid0h5IO66fKk48OLOsd80CKie ImCFMfirVDdc0hbNiyCPZpbxmXlVAYyNyr89mrOHWmbSm+Iyh3eaU89WId1zn6Mua8Bb XYp/Cqy4ZoDoHJSygNp0VH+KyqvA7Uj9mYR7TXMZTmHYL/xiLFMXo+9eDTIdyppgDxok GjTVbV5TQZXlH9Fb9MIuePnnxJ25VxVyRvi8ySwFU22OAT4XsKzNTZ8tBbJCuOM4rdwG g2Zg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=5zq9B3EYDFbItsI1htl3pZImVcLMnN3rRtR9X5rN4LI=; b=js9RNKnvapRz3dcq2BMHUjIEkpv2ILdcFELU49TVzc3koqe8mV/ymt+qF8NB3pP/n6 inEffRwowSSKK503WgsviSokfLJ53LnU9oV2hQskmOmWH/llwoALRiJC0zvGIvX2FkIT MQplb97dtfyDIorspBteSedl245p988K2UIRco0M0mtB+d82bekgclPrYuCa2L6o5Zrb d1UWkgfY5lO9hv9Nx2eY0xl1hfcr150fvNaUVrNiCfD6ne1n3jO93TZwq0pYgXUmNsCz neqDoqC/plIE0qMBwfc0DbYEU/ZPJ8X6M80+0ozbXl296gAnmhZ2K2nKY8W3Cc0ZfGEZ pIfA== X-Gm-Message-State: AOAM5314QSsym30L09SkempVXzlt3F6KOXrtucbfPS5sMC4dXYY2NUF5 0/TRBwQgpbnt/kCEHYSNkLzZjbIghC3ePQ== X-Google-Smtp-Source: ABdhPJzv//oPqJFks491W79fzUGsdVLbJ/kgoNg8wrAgx9IfycZrGL5IPL2QyCfPosJxJjSbF0bZ5g== X-Received: by 2002:a17:90a:e005:: with SMTP id u5mr3492723pjy.201.1618907211880; Tue, 20 Apr 2021 01:26:51 -0700 (PDT) Received: from localhost.localdomain ([2001:470:e92d:10:2558:351:ae01:f5f3]) by smtp.gmail.com with ESMTPSA id e13sm14838232pgt.91.2021.04.20.01.26.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Apr 2021 01:26:51 -0700 (PDT) From: Tony Ambardar X-Google-Original-From: Tony Ambardar To: Stephen Hemminger , David Ahern Cc: Tony Ambardar , netdev@vger.kernel.org Subject: [PATCH iproute2 v2] ip: drop 2-char command assumption Date: Tue, 20 Apr 2021 01:26:36 -0700 Message-Id: <20210420082636.1210305-1-Tony.Ambardar@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <9008a711-be95-caf7-5c56-dad5450e8f5c@gmail.com> References: <9008a711-be95-caf7-5c56-dad5450e8f5c@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The 'ip' utility hardcodes the assumption of being a 2-char command, where any follow-on characters are passed as an argument: $ ./ip-full help Object "-full" is unknown, try "ip help". This confusing behaviour isn't seen with 'tc' for example, and was added in a 2005 commit without documentation. It was noticed during testing of 'ip' variants built/packaged with different feature sets (e.g. w/o BPF support). Mitigate the problem by redoing the command without the 2-char assumption if the follow-on characters fail to parse as a valid command. Fixes: 351efcde4e62 ("Update header files to 2.6.14") Signed-off-by: Tony Ambardar --- v2: (feedback from David Ahern) * work around problem but remain compatible with 2-char assumption --- ip/ip.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/ip/ip.c b/ip/ip.c index 4cf09fc3..8e4c6eb5 100644 --- a/ip/ip.c +++ b/ip/ip.c @@ -125,7 +125,7 @@ static const struct cmd { { 0 } }; -static int do_cmd(const char *argv0, int argc, char **argv) +static int do_cmd(const char *argv0, int argc, char **argv, bool final) { const struct cmd *c; @@ -134,7 +134,8 @@ static int do_cmd(const char *argv0, int argc, char **argv) return -(c->func(argc-1, argv+1)); } - fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0); + if (final) + fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0); return EXIT_FAILURE; } @@ -143,7 +144,7 @@ static int ip_batch_cmd(int argc, char *argv[], void *data) const int *orig_family = data; preferred_family = *orig_family; - return do_cmd(argv[0], argc, argv); + return do_cmd(argv[0], argc, argv, true); } static int batch(const char *name) @@ -313,11 +314,14 @@ int main(int argc, char **argv) rtnl_set_strict_dump(&rth); - if (strlen(basename) > 2) - return do_cmd(basename+2, argc, argv); + if (strlen(basename) > 2) { + int ret = do_cmd(basename+2, argc, argv, false); + if (ret != EXIT_FAILURE) + return ret; + } if (argc > 1) - return do_cmd(argv[1], argc-1, argv+1); + return do_cmd(argv[1], argc-1, argv+1, true); rtnl_close(&rth); usage();