net: Move NetClientState.info_str to dynamic allocations

The info_str field of the NetClientState structure is static and has a size
of 256 bytes. This amount is often unclaimed, and the field itself is used
exclusively for HMP "info network".

The patch translates info_str to dynamic memory allocation.

This action is also allows us to painlessly discard usage of this field
for backend devices.

Signed-off-by: Alexey Kirillov <lekiravi@yandex-team.ru>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 24 insertions, 19 deletions

diff --git a/net/socket.c b/net/socket.c
index 1614523b82..98172347d7 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -180,7 +180,8 @@ static void net_socket_send(void *opaque)
         s->fd = -1;
         net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
         s->nc.link_down = true;
-        memset(s->nc.info_str, 0, sizeof(s->nc.info_str));
+        g_free(s->nc.info_str);
+        s->nc.info_str = g_new0(char, 1);
 
         return;
     }
@@ -400,16 +401,16 @@ static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
         stored->mcast = g_strdup(mcast);
 
         s->dgram_dst = saddr;
-        snprintf(nc->info_str, sizeof(nc->info_str),
-                 "socket: fd=%d (cloned mcast=%s:%d)",
-                 fd, inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
+        nc->info_str = g_strdup_printf("socket: fd=%d (cloned mcast=%s:%d)",
+                                       fd, inet_ntoa(saddr.sin_addr),
+                                       ntohs(saddr.sin_port));
     } else {
         if (sa_type == SOCKET_ADDRESS_TYPE_UNIX) {
             s->dgram_dst.sin_family = AF_UNIX;
         }
 
-        snprintf(nc->info_str, sizeof(nc->info_str),
-                 "socket: fd=%d %s", fd, SocketAddressType_str(sa_type));
+        nc->info_str = g_strdup_printf("socket: fd=%d %s",
+                                       fd, SocketAddressType_str(sa_type));
     }
 
     return s;
@@ -444,7 +445,7 @@ static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
 
     nc = qemu_new_net_client(&net_socket_info, peer, model, name);
 
-    snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
+    nc->info_str = g_strdup_printf("socket: fd=%d", fd);
 
     s = DO_UPCAST(NetSocketState, nc, nc);
 
@@ -528,9 +529,10 @@ static void net_socket_accept(void *opaque)
     stored->has_fd = true;
     stored->fd = g_strdup_printf("%d", fd);
 
-    snprintf(s->nc.info_str, sizeof(s->nc.info_str),
-             "socket: connection from %s:%d",
-             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
+    g_free(s->nc.info_str);
+    s->nc.info_str = g_strdup_printf("socket: connection from %s:%d",
+                                     inet_ntoa(saddr.sin_addr),
+                                     ntohs(saddr.sin_port));
 }
 
 static int net_socket_listen_init(NetClientState *peer,
@@ -645,9 +647,10 @@ static int net_socket_connect_init(NetClientState *peer,
     stored->has_connect = true;
     stored->connect = g_strdup(host_str);
 
-    snprintf(s->nc.info_str, sizeof(s->nc.info_str),
-             "socket: connect to %s:%d",
-             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
+    g_free(s->nc.info_str);
+    s->nc.info_str = g_strdup_printf("socket: connect to %s:%d",
+                                     inet_ntoa(saddr.sin_addr),
+                                     ntohs(saddr.sin_port));
     return 0;
 }
 
@@ -704,9 +707,10 @@ static int net_socket_mcast_init(NetClientState *peer,
         stored->localaddr = g_strdup(localaddr_str);
     }
 
-    snprintf(s->nc.info_str, sizeof(s->nc.info_str),
-             "socket: mcast=%s:%d",
-             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
+    g_free(s->nc.info_str);
+    s->nc.info_str = g_strdup_printf("socket: mcast=%s:%d",
+                                     inet_ntoa(saddr.sin_addr),
+                                     ntohs(saddr.sin_port));
     return 0;
 
 }
@@ -769,9 +773,10 @@ static int net_socket_udp_init(NetClientState *peer,
     stored->has_udp = true;
     stored->udp = g_strdup(rhost);
 
-    snprintf(s->nc.info_str, sizeof(s->nc.info_str),
-             "socket: udp=%s:%d",
-             inet_ntoa(raddr.sin_addr), ntohs(raddr.sin_port));
+    g_free(s->nc.info_str);
+    s->nc.info_str = g_strdup_printf("socket: udp=%s:%d",
+                                     inet_ntoa(raddr.sin_addr),
+                                     ntohs(raddr.sin_port));
     return 0;
 }