#include <fcntl.h>
#include <netdb.h>
#include <poll.h>
+#include <stddef.h>
#include <stdio.h>
#include <string.h>
+#include <sys/resource.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include "fatal-signal.h"
+#include "util.h"
#include "vlog.h"
#define THIS_MODULE VLM_socket_util
}
}
+/* Returns the maximum valid FD value, plus 1. */
+int
+get_max_fds(void)
+{
+ static int max_fds = -1;
+ if (max_fds < 0) {
+ struct rlimit r;
+ if (!getrlimit(RLIMIT_NOFILE, &r)
+ && r.rlim_cur != RLIM_INFINITY
+ && r.rlim_cur != RLIM_SAVED_MAX
+ && r.rlim_cur != RLIM_SAVED_CUR) {
+ max_fds = r.rlim_cur;
+ } else {
+ VLOG_WARN("failed to obtain fd limit, defaulting to 1024");
+ max_fds = 1024;
+ }
+ }
+ return max_fds;
+}
+
/* Translates 'host_name', which may be a DNS name or an IP address, into a
* numeric IP address in '*addr'. Returns 0 if successful, otherwise a
* positive errno value. */
if (!inet_aton(host_name, addr)) {
struct hostent *he = gethostbyname(host_name);
if (he == NULL) {
- VLOG_ERR("gethostbyname(%s): %s", host_name,
- (h_errno == HOST_NOT_FOUND ? "host not found"
- : h_errno == TRY_AGAIN ? "try again"
- : h_errno == NO_RECOVERY ? "non-recoverable error"
- : h_errno == NO_ADDRESS ? "no address"
- : "unknown error"));
+ struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ VLOG_ERR_RL(&rl, "gethostbyname(%s): %s", host_name,
+ (h_errno == HOST_NOT_FOUND ? "host not found"
+ : h_errno == TRY_AGAIN ? "try again"
+ : h_errno == NO_RECOVERY ? "non-recoverable error"
+ : h_errno == NO_ADDRESS ? "no address"
+ : "unknown error"));
return ENOENT;
}
addr->s_addr = *(uint32_t *) he->h_addr;
int error;
socklen_t len = sizeof(error);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
+ struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
error = errno;
- VLOG_ERR("getsockopt(SO_ERROR): %s", strerror(error));
+ VLOG_ERR_RL(&rl, "getsockopt(SO_ERROR): %s", strerror(error));
}
return error;
}
if (retval == 1) {
return get_socket_error(fd);
} else if (retval < 0) {
- VLOG_ERR("poll: %s", strerror(errno));
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
+ VLOG_ERR_RL(&rl, "poll: %s", strerror(errno));
return errno;
} else {
return EAGAIN;
rcvbuf_len = sizeof rcvbuf;
if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &rcvbuf_len) < 0) {
- VLOG_ERR("getsockopt(SO_RCVBUF) failed: %s", strerror(errno));
+ 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;
}
while (rcvbuf > 0) {
}
return 0;
}
+
+/* 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.)*/
+void
+drain_fd(int fd, size_t n_packets)
+{
+ for (; n_packets > 0; n_packets--) {
+ /* 'buffer' only needs to be 1 byte long in most circumstances. This
+ * size is defensive against the possibility that we someday want to
+ * use a Linux tap device without TUN_NO_PI, in which case a buffer
+ * smaller than sizeof(struct tun_pi) will give EINVAL on read. */
+ char buffer[128];
+ if (read(fd, buffer, sizeof buffer) <= 0) {
+ break;
+ }
+ }
+}
+
+/* Stores in '*un' a sockaddr_un that refers to file 'name'. Stores in
+ * '*un_len' the size of the sockaddr_un. */
+static void
+make_sockaddr_un(const char *name, struct sockaddr_un* un, socklen_t *un_len)
+{
+ un->sun_family = AF_UNIX;
+ strncpy(un->sun_path, name, sizeof un->sun_path);
+ un->sun_path[sizeof un->sun_path - 1] = '\0';
+ *un_len = (offsetof(struct sockaddr_un, sun_path)
+ + strlen (un->sun_path) + 1);
+}
+
+/* Creates a Unix domain socket in the given 'style' (either SOCK_DGRAM or
+ * SOCK_STREAM) that is bound to '*bind_path' (if 'bind_path' is non-null) and
+ * connected to '*connect_path' (if 'connect_path' is non-null). If 'nonblock'
+ * is true, the socket is made non-blocking. If 'passcred' is true, the socket
+ * is configured to receive SCM_CREDENTIALS control messages.
+ *
+ * Returns the socket's fd if successful, otherwise a negative errno value. */
+int
+make_unix_socket(int style, bool nonblock, bool passcred UNUSED,
+ const char *bind_path, const char *connect_path)
+{
+ int error;
+ int fd;
+
+ fd = socket(PF_UNIX, style, 0);
+ if (fd < 0) {
+ return -errno;
+ }
+
+ /* Set nonblocking mode right away, if we want it. This prevents blocking
+ * in connect(), if connect_path != NULL. (In turn, that's a corner case:
+ * it will only happen if style is SOCK_STREAM or SOCK_SEQPACKET, and only
+ * if a backlog of un-accepted connections has built up in the kernel.) */
+ if (nonblock) {
+ int flags = fcntl(fd, F_GETFL, 0);
+ if (flags == -1) {
+ goto error;
+ }
+ if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
+ goto error;
+ }
+ }
+
+ if (bind_path) {
+ struct sockaddr_un un;
+ socklen_t un_len;
+ make_sockaddr_un(bind_path, &un, &un_len);
+ if (unlink(un.sun_path) && errno != ENOENT) {
+ VLOG_WARN("unlinking \"%s\": %s\n", un.sun_path, strerror(errno));
+ }
+ fatal_signal_add_file_to_unlink(bind_path);
+ if (bind(fd, (struct sockaddr*) &un, un_len)
+ || fchmod(fd, S_IRWXU)) {
+ goto error;
+ }
+ }
+
+ if (connect_path) {
+ struct sockaddr_un un;
+ socklen_t un_len;
+ make_sockaddr_un(connect_path, &un, &un_len);
+ if (connect(fd, (struct sockaddr*) &un, un_len)
+ && errno != EINPROGRESS) {
+ goto error;
+ }
+ }
+
+#ifdef SCM_CREDENTIALS
+ if (passcred) {
+ int enable = 1;
+ if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable))) {
+ goto error;
+ }
+ }
+#endif
+
+ return fd;
+
+error:
+ if (bind_path) {
+ fatal_signal_remove_file_to_unlink(bind_path);
+ }
+ error = errno;
+ close(fd);
+ return -error;
+}
+
+int
+get_unix_name_len(socklen_t sun_len)
+{
+ return (sun_len >= offsetof(struct sockaddr_un, sun_path)
+ ? sun_len - offsetof(struct sockaddr_un, sun_path)
+ : 0);
+}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff