* [PATCH ucspi-vsock] vsockclient: allow null application
@ 2021-03-24 18:24 Alyssa Ross
2021-03-24 18:44 ` Cole Helbling
0 siblings, 1 reply; 4+ messages in thread
From: Alyssa Ross @ 2021-03-24 18:24 UTC (permalink / raw)
To: devel
I found myself running
vsockclient 2 1024 true
in a situation where it just mattered that a connection was made, and
no data needed to be exchanged of it. That I found myself doing this
is quite a strong indicator that the program to exec into should be
optional.
UCSPI-1996[1] doesn't specify what should happen if no application is
provided, so I think this is a reasonable interpretation. I'm not
sure if I feel the same for vsockserver(d), so I haven't made the
corresponding change there. I'll wait to see if there's ever a need
for it.
[1]: https://cr.yp.to/proto/ucspi.txt
---
vsockclient.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/vsockclient.c b/vsockclient.c
index 934cfa0..456810d 100644
--- a/vsockclient.c
+++ b/vsockclient.c
@@ -41,11 +41,9 @@ int main(int argc, char *argv[])
}
}
- // Check there are enough positional arguments (two for the
- // address and at least one to exec into).
- if (optind > argc - 3)
+ // Find the address (cid and port) to connect to.
+ if (optind > argc - 2)
ex_usage();
-
if (getu32(argv[optind++], 0, UINT32_MAX, &rcid))
ex_usage();
if (getu32(argv[optind++], 0, UINT32_MAX, &rport))
@@ -69,6 +67,11 @@ int main(int argc, char *argv[])
"connect to %" PRIu32 ":%" PRIu32 " failed", rcid, rport);
ilog("connected to %" PRIu32 ":%" PRIu32 "!", rcid, rport);
+ // If we have nothing to exec into, we're done. (Sometimes
+ // just connecting on its own is enough.)
+ if (optind == argc)
+ return 0;
+
// Set up the file descriptors to the well-known UCSPI numbers.
if (dup2(fd, 6) == -1)
diee(EX_OSERR, "dup2");
--
2.30.0
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH ucspi-vsock] vsockclient: allow null application
2021-03-24 18:24 [PATCH ucspi-vsock] vsockclient: allow null application Alyssa Ross
@ 2021-03-24 18:44 ` Cole Helbling
2021-03-24 19:52 ` Alyssa Ross
0 siblings, 1 reply; 4+ messages in thread
From: Cole Helbling @ 2021-03-24 18:44 UTC (permalink / raw)
To: Alyssa Ross, devel
On Wed Mar 24, 2021 at 11:24 AM PDT, Alyssa Ross wrote:
> I found myself running
>
> vsockclient 2 1024 true
>
> in a situation where it just mattered that a connection was made, and
> no data needed to be exchanged of it. That I found myself doing this
> is quite a strong indicator that the program to exec into should be
> optional.
>
> UCSPI-1996[1] doesn't specify what should happen if no application is
> provided, so I think this is a reasonable interpretation. I'm not
> sure if I feel the same for vsockserver(d), so I haven't made the
> corresponding change there. I'll wait to see if there's ever a need
> for it.
>
> [1]: https://cr.yp.to/proto/ucspi.txt
> ---
> vsockclient.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
Reviewed-by: Cole Helbling <cole.e.helbling@outlook.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH ucspi-vsock] vsockclient: allow null application
2021-03-24 18:44 ` Cole Helbling
@ 2021-03-24 19:52 ` Alyssa Ross
2021-03-24 19:53 ` Alyssa Ross
0 siblings, 1 reply; 4+ messages in thread
From: Alyssa Ross @ 2021-03-24 19:52 UTC (permalink / raw)
To: Cole Helbling; +Cc: devel
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> On Wed Mar 24, 2021 at 11:24 AM PDT, Alyssa Ross wrote:
>> I found myself running
>>
>> vsockclient 2 1024 true
>>
>> in a situation where it just mattered that a connection was made, and
>> no data needed to be exchanged of it. That I found myself doing this
>> is quite a strong indicator that the program to exec into should be
>> optional.
>>
>> UCSPI-1996[1] doesn't specify what should happen if no application is
>> provided, so I think this is a reasonable interpretation. I'm not
>> sure if I feel the same for vsockserver(d), so I haven't made the
>> corresponding change there. I'll wait to see if there's ever a need
>> for it.
>>
>> [1]: https://cr.yp.to/proto/ucspi.txt
>> ---
>> vsockclient.c | 11 +++++++----
>> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> Reviewed-by: Cole Helbling <cole.e.helbling@outlook.com>
Committed as d24ff2d. :)
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-03-24 18:24 [PATCH ucspi-vsock] vsockclient: allow null application Alyssa Ross
2021-03-24 18:44 ` Cole Helbling
2021-03-24 19:52 ` Alyssa Ross
2021-03-24 19:53 ` Alyssa Ross
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