On Thu, Nov 18, 2021 at 11:58:27PM +0100, [email protected] wrote: > From: Martin Wilck <[email protected]> > > If the peer uses libmpathcmd, we can be certain that the first > 8 bytes are being sent in a single chunk of data. It's overkill > to try and receive the command length byte-by-byte. > Reviewed-by: Benjamin Marzinski <[email protected]> > Signed-off-by: Martin Wilck <[email protected]> > --- > multipathd/uxlsnr.c | 17 +++++++++-------- > 1 file changed, 9 insertions(+), 8 deletions(-) > > diff --git a/multipathd/uxlsnr.c b/multipathd/uxlsnr.c > index 24db377..6355279 100644 > --- a/multipathd/uxlsnr.c > +++ b/multipathd/uxlsnr.c > @@ -441,6 +441,7 @@ static int client_state_machine(struct client *c, struct > vectors *vecs, > if (!(revents & POLLIN)) > return STM_BREAK; > if (c->cmd_len == 0) { > + size_t len; > /* > * We got POLLIN; assume that at least the length can > * be read immediately. > @@ -449,17 +450,17 @@ static int client_state_machine(struct client *c, > struct vectors *vecs, > c->expires.tv_sec += uxsock_timeout / 1000; > c->expires.tv_nsec += (uxsock_timeout % 1000) * 1000000; > normalize_timespec(&c->expires); > - n = mpath_recv_reply_len(c->fd, 0); > - if (n == -1) { > - condlog(1, "%s: cli[%d]: failed to receive > reply len", > - __func__, c->fd); > - c->error = -ECONNRESET; > - } else if (n > _MAX_CMD_LEN) { > - condlog(1, "%s: cli[%d]: overlong command (%zd > bytes)", > + n = recv(c->fd, &len, sizeof(len), 0); > + if (n < (ssize_t)sizeof(len)) { > + condlog(1, "%s: cli[%d]: failed to receive > reply len: %zd", > __func__, c->fd, n); > c->error = -ECONNRESET; > + } else if (len <= 0 || len > _MAX_CMD_LEN) { > + condlog(1, "%s: cli[%d]: invalid command length > (%zu bytes)", > + __func__, c->fd, len); > + c->error = -ECONNRESET; > } else { > - c->cmd_len = n; > + c->cmd_len = len; > condlog(4, "%s: cli[%d]: connected", __func__, > c->fd); > } > /* poll for data */ > -- > 2.33.1
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