0e3fd3e4f5
Make scan-build happy by casting to 'void *' instead of 'void **'. Submitted by: pjd@ MFC after: 1 month Found by: scan-build and cppcheck Sponsored by: Wheel Systems
469 lines
9.3 KiB
C
469 lines
9.3 KiB
C
/*-
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* Copyright (c) 2013 The FreeBSD Foundation
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* Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef HAVE_PJDLOG
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#include <pjdlog.h>
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#endif
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#include "common_impl.h"
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#include "msgio.h"
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#ifndef HAVE_PJDLOG
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#include <assert.h>
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#define PJDLOG_ASSERT(...) assert(__VA_ARGS__)
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#define PJDLOG_RASSERT(expr, ...) assert(expr)
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#define PJDLOG_ABORT(...) abort()
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#endif
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#define PKG_MAX_SIZE (MCLBYTES / CMSG_SPACE(sizeof(int)) - 1)
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static int
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msghdr_add_fd(struct cmsghdr *cmsg, int fd)
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{
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PJDLOG_ASSERT(fd >= 0);
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if (!fd_is_valid(fd)) {
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errno = EBADF;
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return (-1);
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}
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
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bcopy(&fd, CMSG_DATA(cmsg), sizeof(fd));
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return (0);
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}
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static int
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msghdr_get_fd(struct cmsghdr *cmsg)
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{
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int fd;
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if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET ||
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cmsg->cmsg_type != SCM_RIGHTS ||
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cmsg->cmsg_len != CMSG_LEN(sizeof(fd))) {
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errno = EINVAL;
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return (-1);
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}
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bcopy(CMSG_DATA(cmsg), &fd, sizeof(fd));
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#ifndef MSG_CMSG_CLOEXEC
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/*
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* If the MSG_CMSG_CLOEXEC flag is not available we cannot set the
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* close-on-exec flag atomically, but we still want to set it for
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* consistency.
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*/
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(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
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#endif
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return (fd);
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}
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static void
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fd_wait(int fd, bool doread)
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{
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fd_set fds;
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PJDLOG_ASSERT(fd >= 0);
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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(void)select(fd + 1, doread ? &fds : NULL, doread ? NULL : &fds,
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NULL, NULL);
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}
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static int
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msg_recv(int sock, struct msghdr *msg)
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{
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int flags;
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PJDLOG_ASSERT(sock >= 0);
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#ifdef MSG_CMSG_CLOEXEC
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flags = MSG_CMSG_CLOEXEC;
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#else
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flags = 0;
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#endif
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for (;;) {
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fd_wait(sock, true);
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if (recvmsg(sock, msg, flags) == -1) {
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if (errno == EINTR)
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continue;
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return (-1);
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}
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break;
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}
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return (0);
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}
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static int
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msg_send(int sock, const struct msghdr *msg)
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{
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PJDLOG_ASSERT(sock >= 0);
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for (;;) {
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fd_wait(sock, false);
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if (sendmsg(sock, msg, 0) == -1) {
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if (errno == EINTR)
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continue;
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return (-1);
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}
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break;
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}
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return (0);
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}
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int
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cred_send(int sock)
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{
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unsigned char credbuf[CMSG_SPACE(sizeof(struct cmsgcred))];
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struct msghdr msg;
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struct cmsghdr *cmsg;
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struct iovec iov;
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uint8_t dummy;
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bzero(credbuf, sizeof(credbuf));
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bzero(&msg, sizeof(msg));
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bzero(&iov, sizeof(iov));
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/*
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* XXX: We send one byte along with the control message, because
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* setting msg_iov to NULL only works if this is the first
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* packet send over the socket. Once we send some data we
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* won't be able to send credentials anymore. This is most
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* likely a kernel bug.
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*/
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dummy = 0;
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iov.iov_base = &dummy;
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iov.iov_len = sizeof(dummy);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = credbuf;
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msg.msg_controllen = sizeof(credbuf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_CREDS;
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if (msg_send(sock, &msg) == -1)
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return (-1);
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return (0);
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}
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int
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cred_recv(int sock, struct cmsgcred *cred)
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{
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unsigned char credbuf[CMSG_SPACE(sizeof(struct cmsgcred))];
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struct msghdr msg;
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struct cmsghdr *cmsg;
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struct iovec iov;
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uint8_t dummy;
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bzero(credbuf, sizeof(credbuf));
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bzero(&msg, sizeof(msg));
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bzero(&iov, sizeof(iov));
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iov.iov_base = &dummy;
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iov.iov_len = sizeof(dummy);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = credbuf;
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msg.msg_controllen = sizeof(credbuf);
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if (msg_recv(sock, &msg) == -1)
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return (-1);
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg == NULL ||
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cmsg->cmsg_len != CMSG_LEN(sizeof(struct cmsgcred)) ||
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cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_CREDS) {
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errno = EINVAL;
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return (-1);
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}
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bcopy(CMSG_DATA(cmsg), cred, sizeof(*cred));
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return (0);
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}
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static int
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fd_package_send(int sock, const int *fds, size_t nfds)
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{
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struct msghdr msg;
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struct cmsghdr *cmsg;
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struct iovec iov;
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unsigned int i;
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int serrno, ret;
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uint8_t dummy;
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PJDLOG_ASSERT(sock >= 0);
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PJDLOG_ASSERT(fds != NULL);
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PJDLOG_ASSERT(nfds > 0);
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bzero(&msg, sizeof(msg));
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/*
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* XXX: Look into cred_send function for more details.
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*/
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dummy = 0;
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iov.iov_base = &dummy;
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iov.iov_len = sizeof(dummy);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_controllen = nfds * CMSG_SPACE(sizeof(int));
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msg.msg_control = calloc(1, msg.msg_controllen);
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if (msg.msg_control == NULL)
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return (-1);
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ret = -1;
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for (i = 0, cmsg = CMSG_FIRSTHDR(&msg); i < nfds && cmsg != NULL;
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i++, cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (msghdr_add_fd(cmsg, fds[i]) == -1)
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goto end;
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}
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if (msg_send(sock, &msg) == -1)
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goto end;
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ret = 0;
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end:
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serrno = errno;
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free(msg.msg_control);
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errno = serrno;
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return (ret);
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}
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static int
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fd_package_recv(int sock, int *fds, size_t nfds)
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{
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struct msghdr msg;
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struct cmsghdr *cmsg;
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unsigned int i;
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int serrno, ret;
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struct iovec iov;
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uint8_t dummy;
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PJDLOG_ASSERT(sock >= 0);
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PJDLOG_ASSERT(nfds > 0);
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PJDLOG_ASSERT(fds != NULL);
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bzero(&msg, sizeof(msg));
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bzero(&iov, sizeof(iov));
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/*
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* XXX: Look into cred_send function for more details.
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*/
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iov.iov_base = &dummy;
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iov.iov_len = sizeof(dummy);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_controllen = nfds * CMSG_SPACE(sizeof(int));
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msg.msg_control = calloc(1, msg.msg_controllen);
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if (msg.msg_control == NULL)
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return (-1);
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ret = -1;
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if (msg_recv(sock, &msg) == -1)
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goto end;
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for (i = 0, cmsg = CMSG_FIRSTHDR(&msg); i < nfds && cmsg != NULL;
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i++, cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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fds[i] = msghdr_get_fd(cmsg);
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if (fds[i] < 0)
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break;
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}
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if (cmsg != NULL || i < nfds) {
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int fd;
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/*
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* We need to close all received descriptors, even if we have
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* different control message (eg. SCM_CREDS) in between.
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*/
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
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cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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fd = msghdr_get_fd(cmsg);
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if (fd >= 0)
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close(fd);
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}
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errno = EINVAL;
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goto end;
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}
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ret = 0;
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end:
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serrno = errno;
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free(msg.msg_control);
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errno = serrno;
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return (ret);
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}
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int
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fd_recv(int sock, int *fds, size_t nfds)
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{
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unsigned int i, step, j;
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int ret, serrno;
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if (nfds == 0 || fds == NULL) {
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errno = EINVAL;
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return (-1);
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}
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ret = i = step = 0;
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while (i < nfds) {
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if (PKG_MAX_SIZE < nfds - i)
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step = PKG_MAX_SIZE;
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else
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step = nfds - i;
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ret = fd_package_recv(sock, fds + i, step);
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if (ret != 0) {
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/* Close all received descriptors. */
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serrno = errno;
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for (j = 0; j < i; j++)
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close(fds[j]);
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errno = serrno;
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break;
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}
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i += step;
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}
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return (ret);
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}
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int
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fd_send(int sock, const int *fds, size_t nfds)
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{
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unsigned int i, step;
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int ret;
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if (nfds == 0 || fds == NULL) {
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errno = EINVAL;
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return (-1);
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}
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ret = i = step = 0;
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while (i < nfds) {
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if (PKG_MAX_SIZE < nfds - i)
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step = PKG_MAX_SIZE;
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else
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step = nfds - i;
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ret = fd_package_send(sock, fds + i, step);
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if (ret != 0)
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break;
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i += step;
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}
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return (ret);
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}
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int
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buf_send(int sock, void *buf, size_t size)
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{
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ssize_t done;
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unsigned char *ptr;
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PJDLOG_ASSERT(sock >= 0);
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PJDLOG_ASSERT(size > 0);
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PJDLOG_ASSERT(buf != NULL);
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ptr = buf;
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do {
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fd_wait(sock, false);
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done = send(sock, ptr, size, 0);
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if (done == -1) {
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if (errno == EINTR)
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continue;
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return (-1);
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} else if (done == 0) {
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errno = ENOTCONN;
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return (-1);
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}
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size -= done;
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ptr += done;
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} while (size > 0);
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return (0);
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}
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int
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buf_recv(int sock, void *buf, size_t size)
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{
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ssize_t done;
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unsigned char *ptr;
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PJDLOG_ASSERT(sock >= 0);
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PJDLOG_ASSERT(buf != NULL);
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ptr = buf;
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while (size > 0) {
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fd_wait(sock, true);
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done = recv(sock, ptr, size, 0);
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if (done == -1) {
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if (errno == EINTR)
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continue;
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return (-1);
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} else if (done == 0) {
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errno = ENOTCONN;
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return (-1);
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}
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size -= done;
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ptr += done;
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}
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return (0);
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}
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