Re: [RFC PATCH 1/6] net: introduce convert_host_port()

[Stefano Brivio <sbrivio@redhat.com>]

On Mon,  9 May 2022 19:36:13 +0200
Laurent Vivier <lvivier@redhat.com> wrote:

> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
> ---
>  include/qemu/sockets.h |  2 ++
>  net/net.c              | 62 ++++++++++++++++++++++--------------------
>  2 files changed, 34 insertions(+), 30 deletions(-)
> 
> diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
> index 038faa157f59..47194b9732f8 100644
> --- a/include/qemu/sockets.h
> +++ b/include/qemu/sockets.h
> @@ -47,6 +47,8 @@ void socket_listen_cleanup(int fd, Error **errp);
>  int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp);
>  
>  /* Old, ipv4 only bits.  Don't use for new code. */
> +int convert_host_port(struct sockaddr_in *saddr, const char *host,
> +                      const char *port, Error **errp);
>  int parse_host_port(struct sockaddr_in *saddr, const char *str,
>                      Error **errp);
>  int socket_init(void);
> diff --git a/net/net.c b/net/net.c
> index a094cf1d2929..58c05c200622 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -66,55 +66,57 @@ static QTAILQ_HEAD(, NetClientState) net_clients;
>  /***********************************************************/
>  /* network device redirectors */
>  
> -int parse_host_port(struct sockaddr_in *saddr, const char *str,
> -                    Error **errp)
> +int convert_host_port(struct sockaddr_in *saddr, const char *host,
> +                      const char *port, Error **errp)
>  {
> -    gchar **substrings;
>      struct hostent *he;
> -    const char *addr, *p, *r;
> -    int port, ret = 0;
> +    const char *r;
> +    long p;
>  
>      memset(saddr, 0, sizeof(*saddr));
>  
> -    substrings = g_strsplit(str, ":", 2);
> -    if (!substrings || !substrings[0] || !substrings[1]) {
> -        error_setg(errp, "host address '%s' doesn't contain ':' "
> -                   "separating host from port", str);
> -        ret = -1;
> -        goto out;
> -    }
> -
> -    addr = substrings[0];
> -    p = substrings[1];
> -
>      saddr->sin_family = AF_INET;
> -    if (addr[0] == '\0') {
> +    if (host[0] == '\0') {
>          saddr->sin_addr.s_addr = 0;
>      } else {
> -        if (qemu_isdigit(addr[0])) {
> -            if (!inet_aton(addr, &saddr->sin_addr)) {
> +        if (qemu_isdigit(host[0])) {
> +            if (!inet_aton(host, &saddr->sin_addr)) {

I was about to observe that this doesn't support IPv6 addresses (which
I guess we'd like to have always in the RFC 3986 form "[address]:port",
as the port is mandatory here), and to propose a small change to bridge
this gap.

Then I realised this is (partially) using GLib, so maybe we want to use
g_network_address_parse() which would, however, give us a
GSocketConnectable object.

At that point, do we want to pass the GsocketConnectable thing around,
or stick to struct sockaddr_in{,6}, filling it here from what GLib
gives us?

-- 
Stefano