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vty: fix writing empty IP address for unconfigured NSVCs 

config_write_bts_gprs() currently writes the remote address of an
NSVC even if osmo_sockaddr_str_from_sockaddr() returns non-zero
code.  Thus saving a configuration with only one configured NSVC
to a file would produce the following:

 bts N
  ...
  gprs nsvc 0 nsvci 101
  gprs nsvc 0 local udp port 23023
  gprs nsvc 0 remote ip 127.0.0.1
  gprs nsvc 0 remote udp port 23000
  gprs nsvc 1 nsvci 0
  gprs nsvc 1 local udp port 0
  gprs nsvc 1 remote ip

and next time osmo-bsc would refuse to start due to:

 Error occurred during reading the below line:
  gprs nsvc 1 remote ip

The related condition consists of the following two parts:

  - checking if osmo_sockaddr_str_from_sockaddr() != 0;
  - checking if 'remote.af != AF_UNSPEC'.

The first one is wrong, because osmo_sockaddr_str_from_sockaddr(),
like many other functions, returns 0 on success.  Let's fix this.

After the fix, the second part does not seem to make sense, because
remote.af would remain AF_UNSPEC (0) if the function call succeeds.

Printing the remote port alone does not make sense, let's avoid
printing it if the address cannot be parsed into a string.

Change-Id: I5d6cbde4f605c8184db4ade87de5644a849c05db
Fixes: I621360cab1e12c22248e33d62a9929995053ce04
This commit is contained in:
Vadim Yanitskiy 2021-01-13 22:48:25 +01:00 committed by fixeria
parent df1affded8
commit cbf1b931f2
1 changed files with 9 additions and 13 deletions
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22
src/osmo-bsc/bsc_vty.c
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@ -772,8 +772,7 @@ static void config_write_bts_gprs(struct vty *vty, struct gsm_bts *bts)
bts_sm->gprs.nse.timer[i], VTY_NEWLINE);
for (i = 0; i < ARRAY_SIZE(bts_sm->gprs.nsvc); i++) {
const struct gsm_gprs_nsvc *nsvc = &bts_sm->gprs.nsvc[i];
struct osmo_sockaddr_str remote = {};
uint16_t port;
struct osmo_sockaddr_str remote;
vty_out(vty, " gprs nsvc %u nsvci %u%s", i,
nsvc->nsvci, VTY_NEWLINE);
@ -781,18 +780,15 @@ static void config_write_bts_gprs(struct vty *vty, struct gsm_bts *bts)
vty_out(vty, " gprs nsvc %u local udp port %u%s", i,
nsvc->local_port, VTY_NEWLINE);
if (osmo_sockaddr_str_from_sockaddr(&remote, &nsvc->remote.u.sas) ||
remote.af != AF_UNSPEC) {
vty_out(vty, " gprs nsvc %u remote ip %s%s", i,
remote.ip, VTY_NEWLINE);
}
/* Most likely, the remote address is not configured (AF_UNSPEC).
* Printing the port alone makes no sense, so let's just skip both. */
if (osmo_sockaddr_str_from_sockaddr(&remote, &nsvc->remote.u.sas) != 0)
continue;
/* Can't use remote.port because it's only valid when family != AF_UNSPEC, but the
* port can be even configured when the IP isn't */
port = osmo_htons(nsvc->remote.u.sin.sin_port);
if (port)
vty_out(vty, " gprs nsvc %u remote udp port %u%s", i,
port, VTY_NEWLINE);
vty_out(vty, " gprs nsvc %u remote ip %s%s",
i, remote.ip, VTY_NEWLINE);
vty_out(vty, " gprs nsvc %u remote udp port %u%s",
i, remote.port, VTY_NEWLINE);
}
/* EGPRS specific parameters */