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unix domain: fix path name length

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Unlike any other sockaddr variant it turns out when sockaddr_un reports its
sizeof() to connect() or listen(), it is trimmed to the used length of the
sun_path[] member not including any trailing 0x00.

Until now we worked fine, but our actual UDS paths have a large number of
trailing 0x00 (shown as @ in most tools).  Clients and servers can still
interoperate if they both have this broken name.

This patch fixes it to trim the sockaddr_un to the path length so the name
is as you would expect.
This commit is contained in:
Andy Green 2020-05-15 18:21:56 +01:00
parent 280c81278d
commit d7ac7f4deb
2 changed files with 7 additions and 2 deletions
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4
lib/core-net/network.c
View file

@ -215,7 +215,6 @@ lws_socket_bind(struct lws_vhost *vhost, lws_sockfd_type sockfd, int port,
#if defined(LWS_WITH_UNIX_SOCK)
if (!port && LWS_UNIX_SOCK_ENABLED(vhost)) {
v = (struct sockaddr *)&serv_unix;
n = sizeof(struct sockaddr_un);
memset(&serv_unix, 0, sizeof(serv_unix));
serv_unix.sun_family = AF_UNIX;
if (!iface)
@ -225,12 +224,15 @@ lws_socket_bind(struct lws_vhost *vhost, lws_sockfd_type sockfd, int port,
iface);
return LWS_ITOSA_NOT_EXIST;
}
n = sizeof(uint16_t) + strlen(iface);
strcpy(serv_unix.sun_path, iface);
if (serv_unix.sun_path[0] == '@')
serv_unix.sun_path[0] = '\0';
else
unlink(serv_unix.sun_path);
// lwsl_hexdump_notice(v, n);
} else
#endif
#if defined(LWS_WITH_IPV6) && !defined(LWS_PLAT_FREERTOS)

5
lib/roles/http/client/client-handshake.c
View file

@ -684,7 +684,10 @@ ads_known:
#if defined(LWS_WITH_UNIX_SOCK)
if (wsi->unix_skt) {
psa = (const struct sockaddr *)&sau;
n = sizeof(sau);
if (sau.sun_path[0])
n = sizeof(uint16_t) + strlen(sau.sun_path);
else
n = sizeof(uint16_t) + strlen(&sau.sun_path[1]) + 1;
} else
#endif