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sockets: allow port to be NULL when listening on IP address 

If the port in the SocketAddress struct is NULL, it can allow
the kernel to automatically select a free port. This is useful
in particular in unit tests to avoid a race trying to find a
free port to run a test case on.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2015-09-01 14:46:50 +01:00
parent 2a8e21c7c8
commit 0983f5e6af
2 changed files with 17 additions and 7 deletions
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6
qapi-schema.json
View File

@ -2614,7 +2614,9 @@
#
# @host: host part of the address
#
# @port: port part of the address, or lowest port if @to is present
# @port: port part of the address, or lowest port if @to is present.
# Kernel selects a free port if omitted for listener addresses.
# #optional
#
# @to: highest port to try
#
@ -2629,7 +2631,7 @@
{ 'struct': 'InetSocketAddress',
'data': {
'host': 'str',
'port': 'str',
'*port': 'str',
'*to': 'uint16',
'*ipv4': 'bool',
'*ipv6': 'bool' } }

18
util/qemu-sockets.c
View File

@ -128,12 +128,15 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = SOCK_STREAM;
if ((qemu_opt_get(opts, "host") == NULL) ||
(qemu_opt_get(opts, "port") == NULL)) {
error_setg(errp, "host and/or port not specified");
if ((qemu_opt_get(opts, "host") == NULL)) {
error_setg(errp, "host not specified");
return -1;
}
pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
if (qemu_opt_get(opts, "port") != NULL) {
pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
} else {
port[0] = '\0';
}
addr = qemu_opt_get(opts, "host");
to = qemu_opt_get_number(opts, "to", 0);
@ -145,6 +148,10 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
/* lookup */
if (port_offset) {
unsigned long long baseport;
if (strlen(port) == 0) {
error_setg(errp, "port not specified");
return -1;
}
if (parse_uint_full(port, &baseport, 10) < 0) {
error_setg(errp, "can't convert to a number: %s", port);
return -1;
@ -156,7 +163,8 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
}
snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
}
rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
rc = getaddrinfo(strlen(addr) ? addr : NULL,
strlen(port) ? port : NULL, &ai, &res);
if (rc != 0) {
error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
gai_strerror(rc));