/*
- * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#define O_DIRECTORY 0
#endif
+static int getsockopt_int(int fd, int level, int option, const char *optname,
+ int *valuep);
+
/* Sets 'fd' to non-blocking mode. Returns 0 if successful, otherwise a
* positive errno value. */
int
return 0;
}
+/* Translates 'host_name', which must be a host name or a string representation
+ * of an IP address, into a numeric IP address in '*addr'. Returns 0 if
+ * successful, otherwise a positive errno value.
+ *
+ * Most Open vSwitch code should not use this because it causes deadlocks:
+ * gethostbyname() sends out a DNS request but that starts a new flow for which
+ * OVS must set up a flow, but it can't because it's waiting for a DNS reply.
+ * The synchronous lookup also delays other activty. (Of course we can solve
+ * this but it doesn't seem worthwhile quite yet.) */
+int
+lookup_hostname(const char *host_name, struct in_addr *addr)
+{
+ struct hostent *h;
+
+ if (inet_aton(host_name, addr)) {
+ return 0;
+ }
+
+ h = gethostbyname(host_name);
+ if (h) {
+ *addr = *(struct in_addr *) h->h_addr;
+ return 0;
+ }
+
+ return (h_errno == HOST_NOT_FOUND ? ENOENT
+ : h_errno == TRY_AGAIN ? EAGAIN
+ : h_errno == NO_RECOVERY ? EIO
+ : h_errno == NO_ADDRESS ? ENXIO
+ : EINVAL);
+}
+
/* Returns the error condition associated with socket 'fd' and resets the
* socket's error status. */
int
get_socket_error(int fd)
{
int error;
- socklen_t len = sizeof(error);
- if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
+
+ if (getsockopt_int(fd, SOL_SOCKET, SO_ERROR, "SO_ERROR", &error)) {
error = errno;
- VLOG_ERR_RL(&rl, "getsockopt(SO_ERROR): %s", strerror(error));
}
return error;
}
int
drain_rcvbuf(int fd)
{
- socklen_t rcvbuf_len;
- size_t rcvbuf;
+ int rcvbuf;
- rcvbuf_len = sizeof rcvbuf;
- if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &rcvbuf_len) < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
- VLOG_ERR_RL(&rl, "getsockopt(SO_RCVBUF) failed: %s", strerror(errno));
- return errno;
+ rcvbuf = get_socket_rcvbuf(fd);
+ if (rcvbuf < 0) {
+ return -rcvbuf;
}
+
while (rcvbuf > 0) {
/* In Linux, specifying MSG_TRUNC in the flags argument causes the
* datagram length to be returned, even if that is longer than the
return 0;
}
+/* Returns the size of socket 'sock''s receive buffer (SO_RCVBUF), or a
+ * negative errno value if an error occurs. */
+int
+get_socket_rcvbuf(int sock)
+{
+ int rcvbuf;
+ int error;
+
+ error = getsockopt_int(sock, SOL_SOCKET, SO_RCVBUF, "SO_RCVBUF", &rcvbuf);
+ return error ? -error : rcvbuf;
+}
+
/* Reads and discards up to 'n' datagrams from 'fd', stopping as soon as no
* more data can be immediately read. ('fd' should therefore be in
* non-blocking mode.)*/
error = EPROTO;
}
if (bind_path) {
- fatal_signal_remove_file_to_unlink(bind_path);
+ fatal_signal_unlink_file_now(bind_path);
}
close(fd);
return -error;
* If successful, stores the address into '*sinp' and returns true; otherwise
* zeros '*sinp' and returns false. */
bool
-inet_parse_passive(const char *target_, uint16_t default_port,
+inet_parse_passive(const char *target_, int default_port,
struct sockaddr_in *sinp)
{
char *target = xstrdup(target_);
unsigned int yes = 1;
if (!inet_parse_passive(target, default_port, &sin)) {
- return EAFNOSUPPORT;
+ return -EAFNOSUPPORT;
}
/* Create non-blocking socket, set SO_REUSEADDR. */
if (fd < 0) {
error = errno;
VLOG_ERR("%s: socket: %s", target, strerror(error));
- return error;
+ return -error;
}
error = set_nonblocking(fd);
if (error) {
goto error;
}
if (sin.sin_family != AF_INET || sin_len != sizeof sin) {
+ error = EAFNOSUPPORT;
VLOG_ERR("%s: getsockname: invalid socket name", target);
goto error;
}
error:
close(fd);
- return error;
+ return -error;
}
/* Returns a readable and writable fd for /dev/null, if successful, otherwise
}
static int
-getsockopt_int(int fd, int level, int optname, int *valuep)
+getsockopt_int(int fd, int level, int option, const char *optname, int *valuep)
{
- socklen_t len = sizeof *valuep;
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
+ socklen_t len;
+ int value;
+ int error;
- return (getsockopt(fd, level, optname, valuep, &len) ? errno
- : len == sizeof *valuep ? 0
- : EINVAL);
+ len = sizeof value;
+ if (getsockopt(fd, level, option, &value, &len)) {
+ error = errno;
+ VLOG_ERR_RL(&rl, "getsockopt(%s): %s", optname, strerror(error));
+ } else if (len != sizeof value) {
+ error = EINVAL;
+ VLOG_ERR_RL(&rl, "getsockopt(%s): value is %u bytes (expected %zu)",
+ optname, (unsigned int) len, sizeof value);
+ } else {
+ error = 0;
+ }
+
+ *valuep = error ? 0 : value;
+ return error;
}
static void
#define SO_PROTOCOL 38
#endif
- if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, &protocol)) {
+ if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, "SO_PROTOCOL",
+ &protocol)) {
switch (protocol) {
case NETLINK_ROUTE:
ds_put_cstr(string, "NETLINK_ROUTE");
git://git.onelab.eu / sliver-openvswitch.git / blobdiff