Reviewed by: des MFC after: 2 weeks Sponsored by: Chalmers University of Technology Differential Revision: https://reviews.freebsd.org/D17452
288 lines
7.4 KiB
C
288 lines
7.4 KiB
C
/*-
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* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
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* All rights reserved.
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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 AUTHOR 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 AUTHOR 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.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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#include "debug.h"
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#include "nscdcli.h"
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#include "protocol.h"
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#define DEFAULT_NSCD_IO_TIMEOUT 4
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static int safe_write(struct nscd_connection_ *, const void *, size_t);
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static int safe_read(struct nscd_connection_ *, void *, size_t);
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static int send_credentials(struct nscd_connection_ *, int);
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static int
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safe_write(struct nscd_connection_ *connection, const void *data,
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size_t data_size)
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{
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struct kevent eventlist;
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int nevents;
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size_t result;
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ssize_t s_result;
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struct timespec timeout;
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if (data_size == 0)
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return (0);
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timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
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timeout.tv_nsec = 0;
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result = 0;
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do {
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nevents = kevent(connection->write_queue, NULL, 0, &eventlist,
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1, &timeout);
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if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
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s_result = write(connection->sockfd,
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(char *)data + result,
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(size_t)eventlist.data < data_size - result ?
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(size_t)eventlist.data : data_size - result);
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if (s_result == -1)
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return (-1);
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else
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result += s_result;
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if (eventlist.flags & EV_EOF)
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return (result < data_size ? -1 : 0);
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} else
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return (-1);
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} while (result < data_size);
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return (0);
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}
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static int
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safe_read(struct nscd_connection_ *connection, void *data, size_t data_size)
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{
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struct kevent eventlist;
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size_t result;
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ssize_t s_result;
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struct timespec timeout;
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int nevents;
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if (data_size == 0)
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return (0);
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timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
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timeout.tv_nsec = 0;
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result = 0;
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do {
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nevents = kevent(connection->read_queue, NULL, 0, &eventlist, 1,
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&timeout);
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if ((nevents == 1) && (eventlist.filter == EVFILT_READ)) {
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s_result = read(connection->sockfd,
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(char *)data + result,
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(size_t)eventlist.data <= data_size - result ?
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(size_t)eventlist.data : data_size - result);
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if (s_result == -1)
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return (-1);
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else
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result += s_result;
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if (eventlist.flags & EV_EOF)
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return (result < data_size ? -1 : 0);
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} else
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return (-1);
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} while (result < data_size);
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return (0);
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}
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static int
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send_credentials(struct nscd_connection_ *connection, int type)
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{
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struct kevent eventlist;
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int nevents;
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ssize_t result;
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int res;
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struct msghdr cred_hdr;
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struct iovec iov;
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union {
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struct cmsghdr hdr;
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char cred[CMSG_SPACE(sizeof(struct cmsgcred))];
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} cmsg;
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TRACE_IN(send_credentials);
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memset(&cmsg, 0, sizeof(cmsg));
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cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
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cmsg.hdr.cmsg_level = SOL_SOCKET;
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cmsg.hdr.cmsg_type = SCM_CREDS;
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memset(&cred_hdr, 0, sizeof(struct msghdr));
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cred_hdr.msg_iov = &iov;
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cred_hdr.msg_iovlen = 1;
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cred_hdr.msg_control = &cmsg;
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cred_hdr.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
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iov.iov_base = &type;
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iov.iov_len = sizeof(int);
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EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
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NOTE_LOWAT, sizeof(int), NULL);
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res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
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nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
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if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
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result = (sendmsg(connection->sockfd, &cred_hdr, 0) == -1) ? -1
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: 0;
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EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
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0, 0, NULL);
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kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
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TRACE_OUT(send_credentials);
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return (result);
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} else {
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TRACE_OUT(send_credentials);
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return (-1);
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}
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}
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struct nscd_connection_ *
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open_nscd_connection__(struct nscd_connection_params const *params)
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{
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struct nscd_connection_ *retval;
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struct kevent eventlist;
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struct sockaddr_un client_address;
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int client_address_len, client_socket;
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int res;
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TRACE_IN(open_nscd_connection);
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assert(params != NULL);
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client_socket = socket(PF_LOCAL, SOCK_STREAM, 0);
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client_address.sun_family = PF_LOCAL;
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strlcpy(client_address.sun_path, params->socket_path,
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sizeof(client_address.sun_path));
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client_address_len = sizeof(client_address.sun_family) +
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strlen(client_address.sun_path) + 1;
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res = connect(client_socket, (struct sockaddr *)&client_address,
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client_address_len);
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if (res == -1) {
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close(client_socket);
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TRACE_OUT(open_nscd_connection);
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return (NULL);
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}
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fcntl(client_socket, F_SETFL, O_NONBLOCK);
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retval = calloc(1, sizeof(*retval));
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assert(retval != NULL);
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retval->sockfd = client_socket;
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retval->write_queue = kqueue();
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assert(retval->write_queue != -1);
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EV_SET(&eventlist, retval->sockfd, EVFILT_WRITE, EV_ADD,
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0, 0, NULL);
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res = kevent(retval->write_queue, &eventlist, 1, NULL, 0, NULL);
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retval->read_queue = kqueue();
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assert(retval->read_queue != -1);
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EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD,
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0, 0, NULL);
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res = kevent(retval->read_queue, &eventlist, 1, NULL, 0, NULL);
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TRACE_OUT(open_nscd_connection);
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return (retval);
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}
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void
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close_nscd_connection__(struct nscd_connection_ *connection)
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{
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TRACE_IN(close_nscd_connection);
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assert(connection != NULL);
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close(connection->sockfd);
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close(connection->read_queue);
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close(connection->write_queue);
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free(connection);
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TRACE_OUT(close_nscd_connection);
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}
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int
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nscd_transform__(struct nscd_connection_ *connection,
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const char *entry_name, int transformation_type)
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{
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size_t name_size;
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int error_code;
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int result;
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TRACE_IN(nscd_transform);
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error_code = -1;
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result = 0;
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result = send_credentials(connection, CET_TRANSFORM_REQUEST);
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if (result != 0)
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goto fin;
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if (entry_name != NULL)
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name_size = strlen(entry_name);
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else
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name_size = 0;
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result = safe_write(connection, &name_size, sizeof(size_t));
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if (result != 0)
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goto fin;
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result = safe_write(connection, &transformation_type, sizeof(int));
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if (result != 0)
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goto fin;
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if (entry_name != NULL) {
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result = safe_write(connection, entry_name, name_size);
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if (result != 0)
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goto fin;
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}
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result = safe_read(connection, &error_code, sizeof(int));
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if (result != 0)
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error_code = -1;
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fin:
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TRACE_OUT(nscd_transform);
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return (error_code);
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}
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