X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fsocket-util.c;h=4965b63af4d1cce7e5b62e38579efe26834fb68f;hb=836fad5e1ae4316752150fcdfba9afbf8d5f5801;hp=ed19013020cb8dae903ab91ec128819de6f7b57d;hpb=21a60ea97b492ae642d5b35430b24d137cd67f35;p=openvswitch

diff --git a/lib/socket-util.c b/lib/socket-util.c
index ed190130..4965b63a 100644
--- a/lib/socket-util.c
+++ b/lib/socket-util.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -204,7 +204,7 @@ make_sockaddr_un(const char *name, struct sockaddr_un* un, socklen_t *un_len)
  *
  * Returns the socket's fd if successful, otherwise a negative errno value. */
 int
-make_unix_socket(int style, bool nonblock, bool passcred UNUSED,
+make_unix_socket(int style, bool nonblock, bool passcred OVS_UNUSED,
                  const char *bind_path, const char *connect_path)
 {
     int error;
@@ -292,55 +292,79 @@ guess_netmask(uint32_t ip)
             : htonl(0));                          /* ??? */
 }
 
-/* Opens a non-blocking IPv4 socket of the specified 'style' and connects to
- * 'target', which should be a string in the format "<host>[:<port>]".  <host>
- * is required.  If 'default_port' is nonzero then <port> is optional and
- * defaults to 'default_port'.
- *
- * 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP).
+/* Parses 'target', which should be a string in the format "<host>[:<port>]".
+ * <host> is required.  If 'default_port' is nonzero then <port> is optional
+ * and defaults to 'default_port'.
  *
- * On success, returns 0 (indicating connection complete) or EAGAIN (indicating
- * connection in progress), in which case the new file descriptor is stored
- * into '*fdp'.  On failure, returns a positive errno value other than EAGAIN
- * and stores -1 into '*fdp'.
- *
- * If 'sinp' is non-null, then on success the target address is stored into
- * '*sinp'. */
-int
-inet_open_active(int style, const char *target_, uint16_t default_port,
-                 struct sockaddr_in *sinp, int *fdp)
+ * On success, returns true and stores the parsed remote address into '*sinp'.
+ * On failure, logs an error, stores zeros into '*sinp', and returns false. */
+bool
+inet_parse_active(const char *target_, uint16_t default_port,
+                  struct sockaddr_in *sinp)
 {
     char *target = xstrdup(target_);
     char *save_ptr = NULL;
     const char *host_name;
     const char *port_string;
-    struct sockaddr_in sin;
-    int fd = -1;
-    int error;
+    bool ok = false;
 
     /* Defaults. */
-    memset(&sin, 0, sizeof sin);
-    sin.sin_family = AF_INET;
-    sin.sin_port = htons(default_port);
+    sinp->sin_family = AF_INET;
+    sinp->sin_port = htons(default_port);
 
     /* Tokenize. */
     host_name = strtok_r(target, ":", &save_ptr);
     port_string = strtok_r(NULL, ":", &save_ptr);
     if (!host_name) {
-        ovs_error(0, "%s: bad peer name format", target_);
-        error = EAFNOSUPPORT;
+        VLOG_ERR("%s: bad peer name format", target_);
         goto exit;
     }
 
     /* Look up IP, port. */
-    error = lookup_ip(host_name, &sin.sin_addr);
-    if (error) {
+    if (lookup_ip(host_name, &sinp->sin_addr)) {
         goto exit;
     }
     if (port_string && atoi(port_string)) {
-        sin.sin_port = htons(atoi(port_string));
+        sinp->sin_port = htons(atoi(port_string));
     } else if (!default_port) {
         VLOG_ERR("%s: port number must be specified", target_);
+        goto exit;
+    }
+
+    ok = true;
+
+exit:
+    if (!ok) {
+        memset(sinp, 0, sizeof *sinp);
+    }
+    free(target);
+    return ok;
+}
+
+/* Opens a non-blocking IPv4 socket of the specified 'style' and connects to
+ * 'target', which should be a string in the format "<host>[:<port>]".  <host>
+ * is required.  If 'default_port' is nonzero then <port> is optional and
+ * defaults to 'default_port'.
+ *
+ * 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP).
+ *
+ * On success, returns 0 (indicating connection complete) or EAGAIN (indicating
+ * connection in progress), in which case the new file descriptor is stored
+ * into '*fdp'.  On failure, returns a positive errno value other than EAGAIN
+ * and stores -1 into '*fdp'.
+ *
+ * If 'sinp' is non-null, then on success the target address is stored into
+ * '*sinp'. */
+int
+inet_open_active(int style, const char *target, uint16_t default_port,
+                 struct sockaddr_in *sinp, int *fdp)
+{
+    struct sockaddr_in sin;
+    int fd = -1;
+    int error;
+
+    /* Parse. */
+    if (!inet_parse_active(target, default_port, &sin)) {
         error = EAFNOSUPPORT;
         goto exit;
     }
@@ -348,7 +372,7 @@ inet_open_active(int style, const char *target_, uint16_t default_port,
     /* Create non-blocking socket. */
     fd = socket(AF_INET, style, 0);
     if (fd < 0) {
-        VLOG_ERR("%s: socket: %s", target_, strerror(errno));
+        VLOG_ERR("%s: socket: %s", target, strerror(errno));
         error = errno;
         goto exit;
     }
@@ -379,31 +403,40 @@ exit:
     } else {
         *fdp = -1;
     }
-    free(target);
     return error;
 }
 
 /* Opens a non-blocking IPv4 socket of the specified 'style', binds to
  * 'target', and listens for incoming connections.  'target' should be a string
- * in the format "[<port>][:<ip>]".  <port> may be omitted if 'default_port' is
- * nonzero, in which case it defaults to 'default_port'.  If <ip> is omitted it
- * defaults to the wildcard IP address.
+ * in the format "[<port>][:<ip>]":
+ *
+ *      - If 'default_port' is -1, then <port> is required.  Otherwise, if
+ *        <port> is omitted, then 'default_port' is used instead.
+ *
+ *      - If <port> (or 'default_port', if used) is 0, then no port is bound
+ *        and the TCP/IP stack will select a port.
+ *
+ *      - If <ip> is omitted then the IP address is wildcarded.
  *
  * 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP).
  *
  * For TCP, the socket will have SO_REUSEADDR turned on.
  *
  * On success, returns a non-negative file descriptor.  On failure, returns a
- * negative errno value. */
+ * negative errno value.
+ *
+ * If 'sinp' is non-null, then on success the bound address is stored into
+ * '*sinp'. */
 int
-inet_open_passive(int style, const char *target_, uint16_t default_port)
+inet_open_passive(int style, const char *target_, int default_port,
+                  struct sockaddr_in *sinp)
 {
     char *target = xstrdup(target_);
     char *string_ptr = target;
     struct sockaddr_in sin;
     const char *host_name;
     const char *port_string;
-    int fd, error;
+    int fd, error, port;
     unsigned int yes  = 1;
 
     /* Address defaults. */
@@ -414,9 +447,9 @@ inet_open_passive(int style, const char *target_, uint16_t default_port)
 
     /* Parse optional port number. */
     port_string = strsep(&string_ptr, ":");
-    if (port_string && atoi(port_string)) {
-        sin.sin_port = htons(atoi(port_string));
-    } else if (!default_port) {
+    if (port_string && str_to_int(port_string, 10, &port)) {
+        sin.sin_port = htons(port);
+    } else if (default_port < 0) {
         VLOG_ERR("%s: port number must be specified", target_);
         error = EAFNOSUPPORT;
         goto exit;
@@ -462,6 +495,21 @@ inet_open_passive(int style, const char *target_, uint16_t default_port)
         VLOG_ERR("%s: listen: %s", target_, strerror(error));
         goto exit_close;
     }
+
+    if (sinp) {
+        socklen_t sin_len = sizeof sin;
+        if (getsockname(fd, (struct sockaddr *) &sin, &sin_len) < 0){
+            error = errno;
+            VLOG_ERR("%s: getsockname: %s", target_, strerror(error));
+            goto exit_close;
+        }
+        if (sin.sin_family != AF_INET || sin_len != sizeof sin) {
+            VLOG_ERR("%s: getsockname: invalid socket name", target_);
+            goto exit_close;
+        }
+        *sinp = sin;
+    }
+
     error = 0;
     goto exit;
 
@@ -532,3 +580,62 @@ write_fully(int fd, const void *p_, size_t size, size_t *bytes_written)
     }
     return 0;
 }
+
+/* Given file name 'file_name', fsyncs the directory in which it is contained.
+ * Returns 0 if successful, otherwise a positive errno value. */
+int
+fsync_parent_dir(const char *file_name)
+{
+    int error = 0;
+    char *dir;
+    int fd;
+
+    dir = dir_name(file_name);
+    fd = open(dir, O_RDONLY);
+    if (fd >= 0) {
+        if (fsync(fd)) {
+            if (errno == EINVAL || errno == EROFS) {
+                /* This directory does not support synchronization.  Not
+                 * really an error. */
+            } else {
+                error = errno;
+                VLOG_ERR("%s: fsync failed (%s)", dir, strerror(error));
+            }
+        }
+        close(fd);
+    } else {
+        error = errno;
+        VLOG_ERR("%s: open failed (%s)", dir, strerror(error));
+    }
+    free(dir);
+
+    return error;
+}
+
+/* Obtains the modification time of the file named 'file_name' to the greatest
+ * supported precision.  If successful, stores the mtime in '*mtime' and
+ * returns 0.  On error, returns a positive errno value and stores zeros in
+ * '*mtime'. */
+int
+get_mtime(const char *file_name, struct timespec *mtime)
+{
+    struct stat s;
+
+    if (!stat(file_name, &s)) {
+        mtime->tv_sec = s.st_mtime;
+
+#if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
+        mtime->tv_nsec = s.st_mtim.tv_nsec;
+#elif HAVE_STRUCT_STAT_ST_MTIMENSEC
+        mtime->tv_nsec = s.st_mtimensec;
+#else
+        mtime->tv_nsec = 0;
+#endif
+
+        return 0;
+    } else {
+        mtime->tv_sec = mtime->tv_nsec = 0;
+        return errno;
+    }
+}
+