[PATCH v3 7/9] net: introduce parse_host_port_info()

[Amos Kong <akong@redhat.com>]

int parse_host_port(struct sockaddr_in *saddr, const char *str)
Parsed address info will be restored into 'saddr', it only support ipv4.
This function is used by net_socket_mcast_init() and net_socket_udp_init().

int parse_host_port_info(struct addrinfo *result, const char *str)
Parsed address info will be restored into 'result', it's an address list.
It can be used to parse IPv6 address/port.

Signed-off-by: Amos Kong <akong@redhat.com>
---
 net.c |   26 ++++++++++++++++++++------
 1 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/net.c b/net.c
index de1db8c..2518e5f 100644
--- a/net.c
+++ b/net.c
@@ -130,18 +130,15 @@ static int tcp_client_connect(int fd, struct addrinfo *rp)
     return ret;
 }
 
-static int tcp_start_common(const char *str, int *fd, bool server)
+static int parse_host_port_info(struct addrinfo **result, const char *str,
+                                bool server)
 {
     char hostname[512];
     const char *service;
     const char *name;
     struct addrinfo hints;
-    struct addrinfo *result, *rp;
     int s;
-    int sfd;
-    int ret = -EINVAL;
 
-    *fd = -1;
     service = str;
 
     if (get_str_sep(hostname, sizeof(hostname), &service, ':') < 0) {
@@ -164,12 +161,29 @@ static int tcp_start_common(const char *str, int *fd, bool server)
         hints.ai_flags = AI_PASSIVE;
     }
 
-    s = getaddrinfo(name, service, &hints, &result);
+    s = getaddrinfo(name, service, &hints, result);
     if (s != 0) {
         error_report("qemu: getaddrinfo: %s", gai_strerror(s));
         return -EINVAL;
     }
 
+    return 0;
+}
+
+static int tcp_start_common(const char *str, int *fd, bool server)
+{
+    struct addrinfo *rp;
+    int sfd;
+    int ret = -EINVAL;
+    struct addrinfo *result;
+
+    *fd = -1;
+
+    ret = parse_host_port_info(&result, str, server);
+    if (ret < 0) {
+        return -EINVAL;
+    }
+
     /* getaddrinfo() returns a list of address structures.
        Try each address until we successfully bind/connect).
        If socket(2) (or bind/connect(2)) fails, we (close the socket