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Olof hagsand
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262
apps/backend/backend_socket.c
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262
apps/backend/backend_socket.c
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/*
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*
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Copyright (C) 2009-2016 Olof Hagsand and Benny Holmgren
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This file is part of CLICON.
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CLICON is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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CLICON is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with CLICON; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "clicon_config.h" /* generated by config & autoconf */
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <time.h>
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#include <syslog.h>
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#include <grp.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#ifdef HAVE_SYS_UCRED_H
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#include <sys/types.h>
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#include <sys/ucred.h>
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#endif
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#define __USE_GNU
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <cligen/cligen.h>
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/* clicon */
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#include <clicon/clicon.h>
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#include "backend_socket.h"
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#include "backend_client.h"
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#include "backend_handle.h"
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static int
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config_socket_init_ipv4(clicon_handle h, char *dst)
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{
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int s;
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struct sockaddr_in addr;
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uint16_t port;
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port = clicon_sock_port(h);
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/* create inet socket */
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if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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clicon_err(OE_UNIX, errno, "socket");
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return -1;
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}
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// setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&one, sizeof(one));
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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if (inet_pton(addr.sin_family, dst, &addr.sin_addr) != 1){
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clicon_err(OE_UNIX, errno, "inet_pton: %s (Expected IPv4 address. Check settings of CLICON_SOCK_FAMILY and CLICON_SOCK)", dst);
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goto err; /* Could check getaddrinfo */
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}
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0){
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clicon_err(OE_UNIX, errno, "%s: bind", __FUNCTION__);
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goto err;
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}
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clicon_debug(1, "Listen on server socket at %s:%hu", dst, port);
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if (listen(s, 5) < 0){
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clicon_err(OE_UNIX, errno, "%s: listen", __FUNCTION__);
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goto err;
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}
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return s;
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err:
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close(s);
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return -1;
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}
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/*! Open a socket and bind it to a file descriptor
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*
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* The socket is accessed via CLICON_SOCK option, has 770 permissions
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* and group according to CLICON_SOCK_GROUP option.
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*/
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static int
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config_socket_init_unix(clicon_handle h, char *sock)
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{
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int s;
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struct sockaddr_un addr;
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mode_t old_mask;
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char *config_group;
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gid_t gid;
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struct stat st;
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if (lstat(sock, &st) == 0 && unlink(sock) < 0){
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clicon_err(OE_UNIX, errno, "%s: unlink(%s)", __FUNCTION__, sock);
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return -1;
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}
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/* then find configuration group (for clients) and find its groupid */
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if ((config_group = clicon_sock_group(h)) == NULL){
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clicon_err(OE_FATAL, 0, "clicon_sock_group option not set");
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return -1;
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}
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if (group_name2gid(config_group, &gid) < 0)
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return -1;
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#if 0
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if (gid == 0)
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clicon_log(LOG_WARNING, "%s: No such group: %s\n", __FUNCTION__, config_group);
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#endif
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/* create unix socket */
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if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
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clicon_err(OE_UNIX, errno, "%s: socket", __FUNCTION__);
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return -1;
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}
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// setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&one, sizeof(one));
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memset(&addr, 0, sizeof(addr));
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addr.sun_family = AF_UNIX;
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strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1);
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old_mask = umask(S_IRWXO | S_IXGRP | S_IXUSR);
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if (bind(s, (struct sockaddr *)&addr, SUN_LEN(&addr)) < 0){
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clicon_err(OE_UNIX, errno, "%s: bind", __FUNCTION__);
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umask(old_mask);
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goto err;
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}
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umask(old_mask);
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/* change socket path file group */
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if (lchown(sock, -1, gid) < 0){
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clicon_err(OE_UNIX, errno, "%s: lchown(%s, %s)", __FUNCTION__,
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sock, config_group);
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goto err;
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}
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clicon_debug(1, "Listen on server socket at %s", addr.sun_path);
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if (listen(s, 5) < 0){
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clicon_err(OE_UNIX, errno, "%s: listen", __FUNCTION__);
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goto err;
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}
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return s;
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err:
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close(s);
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return -1;
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}
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int
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config_socket_init(clicon_handle h)
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{
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char *sock;
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if ((sock = clicon_sock(h)) == NULL){
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clicon_err(OE_FATAL, 0, "CLICON_SOCK option not set");
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return -1;
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}
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switch (clicon_sock_family(h)){
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case AF_UNIX:
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return config_socket_init_unix(h, sock);
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break;
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case AF_INET:
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return config_socket_init_ipv4(h, sock);
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break;
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}
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return 0;
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}
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/*
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* config_accept_client
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* XXX: credentials not properly implemented
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*/
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int
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config_accept_client(int fd, void *arg)
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{
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int retval = -1;
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clicon_handle h = (clicon_handle)arg;
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int s;
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struct sockaddr_un from;
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socklen_t len;
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struct client_entry *ce;
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#ifdef DONT_WORK /* XXX HAVE_SYS_UCRED_H */
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struct xucred credentials; /* FreeBSD. */
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socklen_t clen;
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#elif defined(SO_PEERCRED)
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struct ucred credentials; /* Linux. */
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socklen_t clen;
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#endif
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char *config_group;
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struct group *gr;
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char *mem;
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int i;
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clicon_debug(1, "%s", __FUNCTION__);
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len = sizeof(from);
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if ((s = accept(fd, (struct sockaddr*)&from, &len)) < 0){
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clicon_err(OE_UNIX, errno, "%s: accept", __FUNCTION__);
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goto done;
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}
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#if defined(SO_PEERCRED)
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/* fill in the user data structure */
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clen = sizeof(credentials);
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if(getsockopt(s, SOL_SOCKET, SO_PEERCRED/* XXX finns ej i freebsd*/, &credentials, &clen)){
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clicon_err(OE_UNIX, errno, "%s: getsockopt", __FUNCTION__);
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goto done;
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}
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#endif
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if ((ce = backend_client_add(h, (struct sockaddr*)&from)) == NULL)
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goto done;
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#if defined(SO_PEERCRED)
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ce->ce_pid = credentials.pid;
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ce->ce_uid = credentials.uid;
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#endif
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ce->ce_handle = h;
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/* check credentials of caller (not properly implemented yet) */
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if ((config_group = clicon_sock_group(h)) == NULL){
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clicon_err(OE_FATAL, 0, "clicon_sock_group option not set");
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goto done;
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}
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if ((gr = getgrnam(config_group)) != NULL){
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i = 0; /* one of mem should correspond to ce->ce_uid */
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while ((mem = gr->gr_mem[i++]) != NULL)
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;
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}
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#if 0
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{ /* XXX */
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int ii;
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struct client_entry *c;
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for (c = ce_list, ii=0; c; c = c->ce_next, ii++);
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clicon_debug(1, "Open client socket (nr:%d pid:%d [Total: %d])",
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ce->ce_nr, ce->ce_pid, ii);
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}
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#endif
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ce->ce_s = s;
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/*
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* Here we register callbacks for actual data socket
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*/
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if (event_reg_fd(s, from_client, (void*)ce, "client socket") < 0)
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goto done;
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retval = 0;
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done:
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return retval;
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}
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