stream: Make [p]stream_init() take ownership of 'name' parameter.

This will be a more sensible interface in an upcoming commit where many of
the callers are assembling dynamic name strings anyway.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Tested-by: Numan Siddique <nusiddiq@redhat.com>
Acked-by: Numan Siddique <nusiddiq@redhat.com>

8 files changed, 37 insertions, 33 deletions

diff --git a/lib/stream-fd.c b/lib/stream-fd.c
index 31bfc6ed9..95373db11 100644
--- a/lib/stream-fd.c
+++ b/lib/stream-fd.c
@@ -53,10 +53,12 @@ static void maybe_unlink_and_free(char *path);
  * 'connect_status' is interpreted as described for stream_init(). 'fd_type'
  * tells whether the socket is TCP or Unix domain socket.
  *
+ * Takes ownership of 'name'.
+ *
  * Returns 0 if successful, otherwise a positive errno value.  (The current
  * implementation never fails.) */
 int
-new_fd_stream(const char *name, int fd, int connect_status, int fd_type,
+new_fd_stream(char *name, int fd, int connect_status, int fd_type,
               struct stream **streamp)
 {
     struct stream_fd *s;
@@ -205,10 +207,12 @@ fd_pstream_cast(struct pstream *pstream)
  * When '*pstreamp' is closed, then 'unlink_path' (if nonnull) will be passed
  * to fatal_signal_unlink_file_now() and freed with free().
  *
+ * Takes ownership of 'name'.
+ *
  * Returns 0 if successful, otherwise a positive errno value.  (The current
  * implementation never fails.) */
 int
-new_fd_pstream(const char *name, int fd,
+new_fd_pstream(char *name, int fd,
                int (*accept_cb)(int fd, const struct sockaddr_storage *ss,
                                 size_t ss_len, struct stream **streamp),
                char *unlink_path, struct pstream **pstreamp)
diff --git a/lib/stream-fd.h b/lib/stream-fd.h
index 12452dd61..24639900b 100644
--- a/lib/stream-fd.h
+++ b/lib/stream-fd.h
@@ -28,9 +28,9 @@ struct stream;
 struct pstream;
 struct sockaddr_storage;
 
-int new_fd_stream(const char *name, int fd, int connect_status,
+int new_fd_stream(char *name, int fd, int connect_status,
                   int fd_type, struct stream **streamp);
-int new_fd_pstream(const char *name, int fd,
+int new_fd_pstream(char *name, int fd,
                    int (*accept_cb)(int fd, const struct sockaddr_storage *ss,
                                     size_t ss_len, struct stream **),
                    char *unlink_path,
diff --git a/lib/stream-provider.h b/lib/stream-provider.h
index ce88785ca..75f4f059b 100644
--- a/lib/stream-provider.h
+++ b/lib/stream-provider.h
@@ -34,7 +34,7 @@ struct stream {
 };
 
 void stream_init(struct stream *, const struct stream_class *,
-                 int connect_status, const char *name);
+                 int connect_status, char *name);
 static inline void stream_assert_class(const struct stream *stream,
                                        const struct stream_class *class)
 {
@@ -135,7 +135,7 @@ struct pstream {
     ovs_be16 bound_port;
 };
 
-void pstream_init(struct pstream *, const struct pstream_class *, const char *name);
+void pstream_init(struct pstream *, const struct pstream_class *, char *name);
 void pstream_set_bound_port(struct pstream *, ovs_be16 bound_port);
 static inline void pstream_assert_class(const struct pstream *pstream,
                                         const struct pstream_class *class)
diff --git a/lib/stream-ssl.c b/lib/stream-ssl.c
index 97d6e7464..6dc6f25fd 100644
--- a/lib/stream-ssl.c
+++ b/lib/stream-ssl.c
@@ -220,8 +220,9 @@ want_to_poll_events(int want)
     }
 }
 
+/* Takes ownership of 'name'. */
 static int
-new_ssl_stream(const char *name, int fd, enum session_type type,
+new_ssl_stream(char *name, int fd, enum session_type type,
                enum ssl_state state, struct stream **streamp)
 {
     struct ssl_stream *sslv;
@@ -323,7 +324,7 @@ ssl_open(const char *name, char *suffix, struct stream **streamp, uint8_t dscp)
                              dscp);
     if (fd >= 0) {
         int state = error ? STATE_TCP_CONNECTING : STATE_SSL_CONNECTING;
-        return new_ssl_stream(name, fd, CLIENT, state, streamp);
+        return new_ssl_stream(xstrdup(name), fd, CLIENT, state, streamp);
     } else {
         VLOG_ERR("%s: connect: %s", name, ovs_strerror(error));
         return error;
@@ -847,7 +848,7 @@ pssl_open(const char *name OVS_UNUSED, char *suffix, struct pstream **pstreamp,
              port, ss_format_address(&ss, addrbuf, sizeof addrbuf));
 
     pssl = xmalloc(sizeof *pssl);
-    pstream_init(&pssl->pstream, &pssl_pstream_class, bound_name);
+    pstream_init(&pssl->pstream, &pssl_pstream_class, xstrdup(bound_name));
     pstream_set_bound_port(&pssl->pstream, htons(port));
     pssl->fd = fd;
     *pstreamp = &pssl->pstream;
@@ -896,7 +897,7 @@ pssl_accept(struct pstream *pstream, struct stream **new_streamp)
     snprintf(name, sizeof name, "ssl:%s:%"PRIu16,
              ss_format_address(&ss, addrbuf, sizeof addrbuf),
              ss_get_port(&ss));
-    return new_ssl_stream(name, new_fd, SERVER, STATE_SSL_CONNECTING,
+    return new_ssl_stream(xstrdup(name), new_fd, SERVER, STATE_SSL_CONNECTING,
                           new_streamp);
 }
 
diff --git a/lib/stream-tcp.c b/lib/stream-tcp.c
index 1749fadbf..da88cbafa 100644
--- a/lib/stream-tcp.c
+++ b/lib/stream-tcp.c
@@ -37,9 +37,9 @@ VLOG_DEFINE_THIS_MODULE(stream_tcp);
 
 /* Active TCP. */
 
+/* Takes ownership of 'name'. */
 static int
-new_tcp_stream(const char *name, int fd, int connect_status,
-               struct stream **streamp)
+new_tcp_stream(char *name, int fd, int connect_status, struct stream **streamp)
 {
     if (connect_status == 0) {
         setsockopt_tcp_nodelay(fd);
@@ -55,7 +55,7 @@ tcp_open(const char *name, char *suffix, struct stream **streamp, uint8_t dscp)
 
     error = inet_open_active(SOCK_STREAM, suffix, 0, NULL, &fd, dscp);
     if (fd >= 0) {
-        return new_tcp_stream(name, fd, error, streamp);
+        return new_tcp_stream(xstrdup(name), fd, error, streamp);
     } else {
         VLOG_ERR("%s: connect: %s", name, ovs_strerror(error));
         return error;
@@ -105,7 +105,8 @@ new_pstream(char *suffix, const char *name, struct pstream **pstreamp,
         conn_name = bound_name;
     }
 
-    error = new_fd_pstream(conn_name, fd, ptcp_accept, unlink_path, pstreamp);
+    error = new_fd_pstream(xstrdup(conn_name), fd,
+                           ptcp_accept, unlink_path, pstreamp);
     if (!error) {
         pstream_set_bound_port(*pstreamp, htons(port));
     }
@@ -129,7 +130,7 @@ ptcp_accept(int fd, const struct sockaddr_storage *ss,
     snprintf(name, sizeof name, "tcp:%s:%"PRIu16,
              ss_format_address(ss, addrbuf, sizeof addrbuf),
              ss_get_port(ss));
-    return new_tcp_stream(name, fd, 0, streamp);
+    return new_tcp_stream(xstrdup(name), fd, 0, streamp);
 }
 
 const struct pstream_class ptcp_pstream_class = {
diff --git a/lib/stream-unix.c b/lib/stream-unix.c
index 6424d3e4a..40ded1952 100644
--- a/lib/stream-unix.c
+++ b/lib/stream-unix.c
@@ -57,7 +57,7 @@ unix_open(const char *name, char *suffix, struct stream **streamp,
     }
 
     free(connect_path);
-    return new_fd_stream(name, fd, check_connection_completion(fd),
+    return new_fd_stream(xstrdup(name), fd, check_connection_completion(fd),
                          AF_UNIX, streamp);
 }
 
@@ -102,7 +102,8 @@ punix_open(const char *name OVS_UNUSED, char *suffix,
         return error;
     }
 
-    return new_fd_pstream(name, fd, punix_accept, bind_path, pstreamp);
+    return new_fd_pstream(xstrdup(name), fd,
+                          punix_accept, bind_path, pstreamp);
 }
 
 static int
@@ -111,14 +112,10 @@ punix_accept(int fd, const struct sockaddr_storage *ss, size_t ss_len,
 {
     const struct sockaddr_un *sun = (const struct sockaddr_un *) ss;
     int name_len = get_unix_name_len(sun, ss_len);
-    char name[128];
-
-    if (name_len > 0) {
-        snprintf(name, sizeof name, "unix:%.*s", name_len, sun->sun_path);
-    } else {
-        strcpy(name, "unix");
-    }
-    return new_fd_stream(name, fd, 0, AF_UNIX, streamp);
+    char *bound_name = (name_len > 0
+                        ? xasprintf("unix:%.*s", name_len, sun->sun_path)
+                        : xstrdup("unix"));
+    return new_fd_stream(bound_name, fd, 0, AF_UNIX, streamp);
 }
 
 const struct pstream_class punix_pstream_class = {
diff --git a/lib/stream-windows.c b/lib/stream-windows.c
index c5a26c814..b4b2aa7f3 100644
--- a/lib/stream-windows.c
+++ b/lib/stream-windows.c
@@ -161,7 +161,7 @@ windows_open(const char *name, char *suffix, struct stream **streamp,
         return ENOENT;
     }
     struct windows_stream *s = xmalloc(sizeof *s);
-    stream_init(&s->stream, &windows_stream_class, 0, name);
+    stream_init(&s->stream, &windows_stream_class, 0, xstrdup(name));
     s->pipe_path = connect_path;
     s->fd = npipe;
     /* This is an active stream. */
@@ -555,7 +555,7 @@ pwindows_accept(struct pstream *pstream, struct stream **new_streamp)
     /* Give the handle p->fd to the new created active stream and specify it
      * was created by an active stream. */
     struct windows_stream *p_temp = xmalloc(sizeof *p_temp);
-    stream_init(&p_temp->stream, &windows_stream_class, 0, "unix");
+    stream_init(&p_temp->stream, &windows_stream_class, 0, xstrdup("unix"));
     p_temp->fd = p->fd;
     /* Specify it was created by a passive stream. */
     p_temp->server = true;
@@ -642,7 +642,7 @@ pwindows_open(const char *name OVS_UNUSED, char *suffix,
     }
 
     struct pwindows_pstream *p = xmalloc(sizeof *p);
-    pstream_init(&p->pstream, &pwindows_pstream_class, name);
+    pstream_init(&p->pstream, &pwindows_pstream_class, xstrdup(name));
     p->fd = npipe;
     p->unlink_path = orig_path;
     memset(&p->connect, 0, sizeof(p->connect));
diff --git a/lib/stream.c b/lib/stream.c
index 6b57c7c1c..ec33a690e 100644
--- a/lib/stream.c
+++ b/lib/stream.c
@@ -634,10 +634,10 @@ pstream_get_bound_port(const struct pstream *pstream)
  * After calling this function, stream_close() must be used to destroy
  * 'stream', otherwise resources will be leaked.
  *
- * The caller retains ownership of 'name'. */
+ * Takes ownership of 'name'. */
 void
 stream_init(struct stream *stream, const struct stream_class *class,
-            int connect_status, const char *name)
+            int connect_status, char *name)
 {
     memset(stream, 0, sizeof *stream);
     stream->class = class;
@@ -645,17 +645,18 @@ stream_init(struct stream *stream, const struct stream_class *class,
                     : !connect_status ? SCS_CONNECTED
                     : SCS_DISCONNECTED);
     stream->error = connect_status;
-    stream->name = xstrdup(name);
+    stream->name = name;
     ovs_assert(stream->state != SCS_CONNECTING || class->connect);
 }
 
+/* Takes ownership of 'name'. */
 void
 pstream_init(struct pstream *pstream, const struct pstream_class *class,
-            const char *name)
+            char *name)
 {
     memset(pstream, 0, sizeof *pstream);
     pstream->class = class;
-    pstream->name = xstrdup(name);
+    pstream->name = name;
 }
 
 void