/*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#include "fatal-signal.h"
#include "util.h"
-
#include "vlog.h"
-#define THIS_MODULE VLM_socket_util
+
+VLOG_DEFINE_THIS_MODULE(socket_util);
+
+/* #ifdefs make it a pain to maintain code: you have to try to build both ways.
+ * Thus, this file compiles all of the code regardless of the target, by
+ * writing "if (LINUX)" instead of "#ifdef __linux__". */
+#ifdef __linux__
+#define LINUX 1
+#else
+#define LINUX 0
+#endif
+
+#ifndef O_DIRECTORY
+#define O_DIRECTORY 0
+#endif
/* Sets 'fd' to non-blocking mode. Returns 0 if successful, otherwise a
* positive errno value. */
}
}
+static bool
+rlim_is_finite(rlim_t limit)
+{
+ if (limit == RLIM_INFINITY) {
+ return false;
+ }
+
+#ifdef RLIM_SAVED_CUR /* FreeBSD 8.0 lacks RLIM_SAVED_CUR. */
+ if (limit == RLIM_SAVED_CUR) {
+ return false;
+ }
+#endif
+
+#ifdef RLIM_SAVED_MAX /* FreeBSD 8.0 lacks RLIM_SAVED_MAX. */
+ if (limit == RLIM_SAVED_MAX) {
+ return false;
+ }
+#endif
+
+ return true;
+}
+
/* 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) {
+ if (!getrlimit(RLIMIT_NOFILE, &r) && rlim_is_finite(r.rlim_cur)) {
max_fds = r.rlim_cur;
} else {
VLOG_WARN("failed to obtain fd limit, defaulting to 1024");
* address, into a numeric IP address in '*addr'. Returns 0 if successful,
* otherwise a positive errno value. */
int
-lookup_ip(const char *host_name, struct in_addr *addr)
+lookup_ip(const char *host_name, struct in_addr *addr)
{
if (!inet_aton(host_name, addr)) {
- struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
VLOG_ERR_RL(&rl, "\"%s\" is not a valid IP address", host_name);
return ENOENT;
}
return 0;
}
+/* Translates 'host_name', which must be a string representation of an IPv6
+ * address, into a numeric IPv6 address in '*addr'. Returns 0 if successful,
+ * otherwise a positive errno value. */
+int
+lookup_ipv6(const char *host_name, struct in6_addr *addr)
+{
+ if (inet_pton(AF_INET6, host_name, addr) != 1) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ VLOG_ERR_RL(&rl, "\"%s\" is not a valid IPv6 address", host_name);
+ return ENOENT;
+ }
+ return 0;
+}
+
/* Returns the error condition associated with socket 'fd' and resets the
* socket's error status. */
int
-get_socket_error(int fd)
+get_socket_error(int fd)
{
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);
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
error = errno;
VLOG_ERR_RL(&rl, "getsockopt(SO_ERROR): %s", strerror(error));
}
}
int
-check_connection_completion(int fd)
+check_connection_completion(int fd)
{
struct pollfd pfd;
int retval;
*
* On other Unix-like OSes, MSG_TRUNC has no effect in the flags
* argument. */
-#ifdef __linux__
-#define BUFFER_SIZE 1
-#else
-#define BUFFER_SIZE 2048
-#endif
- char buffer[BUFFER_SIZE];
+ char buffer[LINUX ? 1 : 2048];
ssize_t n_bytes = recv(fd, buffer, sizeof buffer,
MSG_TRUNC | MSG_DONTWAIT);
if (n_bytes <= 0 || n_bytes >= rcvbuf) {
/* 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)
+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);
+ strlen (un->sun_path) + 1);
}
+/* Stores in '*un' a sockaddr_un that refers to file 'name'. Stores in
+ * '*un_len' the size of the sockaddr_un.
+ *
+ * Returns 0 on success, otherwise a positive errno value. On success,
+ * '*dirfdp' is either -1 or a nonnegative file descriptor that the caller
+ * should close after using '*un' to bind or connect. On failure, '*dirfdp' is
+ * -1. */
+static int
+make_sockaddr_un(const char *name, struct sockaddr_un *un, socklen_t *un_len,
+ int *dirfdp)
+{
+ enum { MAX_UN_LEN = sizeof un->sun_path - 1 };
+
+ *dirfdp = -1;
+ if (strlen(name) > MAX_UN_LEN) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
+
+ if (LINUX) {
+ /* 'name' is too long to fit in a sockaddr_un, but we have a
+ * workaround for that on Linux: shorten it by opening a file
+ * descriptor for the directory part of the name and indirecting
+ * through /proc/self/fd/<dirfd>/<basename>. */
+ char *dir, *base;
+ char *short_name;
+ int dirfd;
+
+ dir = dir_name(name);
+ base = base_name(name);
+
+ dirfd = open(dir, O_DIRECTORY | O_RDONLY);
+ if (dirfd < 0) {
+ return errno;
+ }
+
+ short_name = xasprintf("/proc/self/fd/%d/%s", dirfd, base);
+ free(dir);
+ free(base);
+
+ if (strlen(short_name) <= MAX_UN_LEN) {
+ make_sockaddr_un__(short_name, un, un_len);
+ free(short_name);
+ *dirfdp = dirfd;
+ return 0;
+ }
+ free(short_name);
+ close(dirfd);
+
+ VLOG_WARN_RL(&rl, "Unix socket name %s is longer than maximum "
+ "%d bytes (even shortened)", name, MAX_UN_LEN);
+ } else {
+ /* 'name' is too long and we have no workaround. */
+ VLOG_WARN_RL(&rl, "Unix socket name %s is longer than maximum "
+ "%d bytes", name, MAX_UN_LEN);
+ }
+
+ return ENAMETOOLONG;
+ } else {
+ make_sockaddr_un__(name, un, un_len);
+ return 0;
+ }
+}
+
/* 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'
*
* 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;
if (nonblock) {
int flags = fcntl(fd, F_GETFL, 0);
if (flags == -1) {
+ error = errno;
goto error;
}
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
+ error = errno;
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));
+ int dirfd;
+
+ if (unlink(bind_path) && errno != ENOENT) {
+ VLOG_WARN("unlinking \"%s\": %s\n", bind_path, strerror(errno));
}
fatal_signal_add_file_to_unlink(bind_path);
- if (bind(fd, (struct sockaddr*) &un, un_len)
- || fchmod(fd, S_IRWXU)) {
+
+ error = make_sockaddr_un(bind_path, &un, &un_len, &dirfd);
+ if (!error && (bind(fd, (struct sockaddr*) &un, un_len)
+ || fchmod(fd, S_IRWXU))) {
+ error = errno;
+ }
+ if (dirfd >= 0) {
+ close(dirfd);
+ }
+ if (error) {
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)
+ int dirfd;
+
+ error = make_sockaddr_un(connect_path, &un, &un_len, &dirfd);
+ if (!error
+ && connect(fd, (struct sockaddr*) &un, un_len)
&& errno != EINPROGRESS) {
- printf("connect failed with %s\n", strerror(errno));
+ error = errno;
+ }
+ if (dirfd >= 0) {
+ close(dirfd);
+ }
+ if (error) {
goto error;
}
}
if (passcred) {
int enable = 1;
if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable))) {
+ error = errno;
goto error;
}
}
return fd;
error:
- error = errno == EAGAIN ? EPROTO : errno;
+ if (error == EAGAIN) {
+ error = EPROTO;
+ }
if (bind_path) {
fatal_signal_remove_file_to_unlink(bind_path);
}
: 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;
}
/* 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;
}
} else {
*fdp = -1;
}
- free(target);
return error;
}
* 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_, int 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, port;
+ int fd = 0, error, port;
unsigned int yes = 1;
/* Address defaults. */
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;
}
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;
+ }
+}
+
git://git.onelab.eu / sliver-openvswitch.git / blobdiff