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/* file descriptors, for libreswan
*
* Copyright (C) 2018 Andrew Cagney
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <unistd.h> /* for close() */
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include "fd.h"
#include "lswalloc.h"
#include "refcnt.h"
#include "lswlog.h" /* for pexpect() */
struct fd {
#define FD_MAGIC 0xf00d1e
unsigned magic;
int fd;
refcnt_t refcnt;
};
struct fd *fd_addref_where(struct fd *fd, const struct where *where)
{
pexpect(fd == NULL || fd->magic == FD_MAGIC);
return addref_where(fd, where);
}
void fd_delref_where(struct fd **fdp, where_t where)
{
const struct logger *logger = &global_logger;
struct fd *fd = delref_where(fdp, logger, where);
if (fd != NULL) {
pexpect(fd->magic == FD_MAGIC);
if (close(fd->fd) != 0) {
if (DBGP(DBG_BASE)) {
llog_errno(DEBUG_STREAM, logger, errno,
"freeref "PRI_FD" close() failed "PRI_WHERE": ",
pri_fd(fd), pri_where(where));
}
} else {
ldbg(logger, "freeref "PRI_FD" "PRI_WHERE"",
pri_fd(fd), pri_where(where));
}
fd->magic = ~FD_MAGIC;
pfree(fd);
}
}
void fd_leak(struct fd *fd, where_t where)
{
dbg("leaking "PRI_FD"'s FD; will be closed when pluto exits "PRI_WHERE"",
pri_fd(fd), pri_where(where));
/* leave the old underlying file descriptor open */
if (fd != NULL) {
fd->fd = dup(fd->fd);
}
}
ssize_t fd_sendmsg(const struct fd *fd, const struct msghdr *msg, int flags)
{
if (fd == NULL || fd->magic != FD_MAGIC) {
/*
* XXX: passert() / pexpect() would be recursive -
* they will call this function when trying to write
* to whack.
*/
return -EFAULT;
}
ssize_t s = sendmsg(fd->fd, msg, flags);
return s < 0 ? -errno : s;
}
struct fd *fd_accept(int socket, const struct where *where, struct logger *logger)
{
struct sockaddr_un addr;
socklen_t addrlen = sizeof(addr);
int fd = accept(socket, (struct sockaddr *)&addr, &addrlen);
if (fd < 0) {
llog_error(logger, errno, "accept() failed in "PRI_WHERE"",
pri_where(where));
return NULL;
}
if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
llog_error(logger, errno, "failed to set CLOEXEC in "PRI_WHERE"",
pri_where(where));
close(fd);
return NULL;
}
struct fd *fdt = refcnt_alloc(struct fd, where);
fdt->fd = fd;
fdt->magic = FD_MAGIC;
dbg("%s: new "PRI_FD" "PRI_WHERE"",
__func__, pri_fd(fdt), pri_where(where));
return fdt;
}
ssize_t fd_read(const struct fd *fd, void *buf, size_t nbytes)
{
if (fd == NULL || fd->magic != FD_MAGIC) {
return -EFAULT;
}
ssize_t s = read(fd->fd, buf, nbytes);
return s < 0 ? -errno : s;
}
bool fd_p(const struct fd *fd)
{
if (fd == NULL) {
return false;
}
if (fd->magic != FD_MAGIC) {
llog_pexpect(&global_logger, HERE,
"wrong magic for "PRI_FD"", pri_fd(fd));
return false;
}
return true;
}
bool same_fd(const struct fd *l, const struct fd *r)
{
return fd_p(l) && fd_p(r) && l == r;
}
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