netdev - [PATCH iproute2 1/2] ip route: print route type in JSON output

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Date:   Mon, 18 Mar 2019 18:19:29 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Phil Sutter <phil@....cc>, Andrea Claudi <aclaudi@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        David Ahern <dsahern@...il.com>
Subject: [PATCH iproute2 1/2] ip route: print route type in JSON output

ip route generates an invalid JSON if the route type has to be printed,
eg. when detailed mode is active, or the type is different that unicast:

    $ ip -d -j -p route show
    [ {"unicast",
            "dst": "192.168.122.0/24",
            "dev": "virbr0",
            "protocol": "kernel",
            "scope": "link",
            "prefsrc": "192.168.122.1",
            "flags": [ "linkdown" ]
        } ]

    $ ip -j -p route show
    [ {"unreachable",
            "dst": "192.168.23.0/24",
            "flags": [ ]
        },{"prohibit",
            "dst": "192.168.24.0/24",
            "flags": [ ]
        },{"blackhole",
            "dst": "192.168.25.0/24",
            "flags": [ ]
        } ]

Fix it by printing the route type as the "type" attribute:

    $ ip -d -j -p route show
    [ {
            "type": "unicast",
            "dst": "default",
            "gateway": "192.168.85.1",
            "dev": "wlp3s0",
            "protocol": "dhcp",
            "scope": "global",
            "metric": 600,
            "flags": [ ]
        },{
            "type": "unreachable",
            "dst": "192.168.23.0/24",
            "protocol": "boot",
            "scope": "global",
            "flags": [ ]
        },{
            "type": "prohibit",
            "dst": "192.168.24.0/24",
            "protocol": "boot",
            "scope": "global",
            "flags": [ ]
        },{
            "type": "blackhole",
            "dst": "192.168.25.0/24",
            "protocol": "boot",
            "scope": "global",
            "flags": [ ]
        } ]

Fixes: 663c3cb23103 ("iproute: implement JSON and color output")
Acked-by: Phil Sutter <phil@....cc>
Reviewed-and-tested-by: Andrea Claudi <aclaudi@...hat.com>
Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 ip/iproute.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ip/iproute.c b/ip/iproute.c
index cc02a3e1..e091927b 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -766,7 +766,7 @@ int print_route(struct nlmsghdr *n, void *arg)
 
 	if ((r->rtm_type != RTN_UNICAST || show_details > 0) &&
 	    (!filter.typemask || (filter.typemask & (1 << r->rtm_type))))
-		print_string(PRINT_ANY, NULL, "%s ",
+		print_string(PRINT_ANY, "type", "%s ",
 			     rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
 
 	color = COLOR_NONE;
-- 
2.20.1