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/*
* Copyright (C) 2015-2018 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <endian.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "afb-fdev.h"
#include "afb-socket.h"
#include "afb-systemd.h"
#include "fdev.h"
#include "verbose.h"
#define BACKLOG 5
/******************************************************************************/
static int open_unix(const char *spec, int server)
{
int fd, rc, abstract;
struct sockaddr_un addr;
size_t length;
abstract = spec[0] == '@';
/* check the length */
length = strlen(spec);
if (length >= 108) {
errno = ENAMETOOLONG;
return -1;
}
/* remove the file on need */
if (server && !abstract)
unlink(spec);
/* create a socket */
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return fd;
/* prepare address */
memset(&addr, 0, sizeof addr);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, spec);
if (abstract)
addr.sun_path[0] = 0; /* implement abstract sockets */
if (server) {
rc = bind(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
} else {
rc = connect(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
}
if (rc < 0) {
close(fd);
return rc;
}
return fd;
}
static int open_inet(const char *spec, int server)
{
int rc, fd;
const char *service, *host, *api;
struct addrinfo hint, *rai, *iai;
/* scan the uri */
api = strrchr(spec, '/');
service = strrchr(spec, ':');
if (api == NULL || service == NULL || api < service) {
errno = EINVAL;
return -1;
}
host = strndupa(spec, service++ - spec);
service = strndupa(service, api - service);
/* get addr */
memset(&hint, 0, sizeof hint);
hint.ai_family = AF_INET;
hint.ai_socktype = SOCK_STREAM;
rc = getaddrinfo(host, service, &hint, &rai);
if (rc != 0) {
errno = EINVAL;
return -1;
}
/* get the socket */
iai = rai;
while (iai != NULL) {
fd = socket(iai->ai_family, iai->ai_socktype, iai->ai_protocol);
if (fd >= 0) {
if (server) {
rc = bind(fd, iai->ai_addr, iai->ai_addrlen);
} else {
rc = connect(fd, iai->ai_addr, iai->ai_addrlen);
}
if (rc == 0) {
freeaddrinfo(rai);
return fd;
}
close(fd);
}
iai = iai->ai_next;
}
freeaddrinfo(rai);
return -1;
}
static int open_systemd(const char *spec)
{
#if defined(NO_SYSTEMD_ACTIVATION)
errno = EAFNOSUPPORT;
fd = -1;
#else
return afb_systemd_fds_for(spec);
#endif
}
/******************************************************************************/
enum type {
Type_Inet,
Type_Systemd,
Type_Unix
};
struct entry
{
const char *prefix;
unsigned type: 2;
unsigned noreuseaddr: 1;
unsigned nolisten: 1;
};
static struct entry entries[] = { /* default at first place */
{
.prefix = "tcp:",
.type = Type_Inet
},
{
.prefix = "sd:",
.type = Type_Systemd,
.noreuseaddr = 1,
.nolisten = 1
},
{
.prefix = "unix:",
.type = Type_Unix
}
};
/******************************************************************************/
/* get the entry of the uri by searching to its prefix */
static struct entry *get_entry(const char *uri, int *offset)
{
int l, search = 1, i = (int)(sizeof entries / sizeof * entries);
while (search) {
if (!i) {
l = 0;
search = 0;
} else {
i--;
l = (int)strlen(entries[i].prefix);
search = strncmp(uri, entries[i].prefix, l);
}
}
*offset = l;
return &entries[i];
}
static int open_any(const char *uri, int server)
{
int fd, rc, offset;
struct entry *e;
/* search for the entry */
e = get_entry(uri, &offset);
/* get the names */
uri += offset;
/* open the socket */
switch (e->type) {
case Type_Unix:
fd = open_unix(uri, server);
break;
case Type_Inet:
fd = open_inet(uri, server);
break;
case Type_Systemd:
fd = open_systemd(uri);
break;
default:
errno = EAFNOSUPPORT;
fd = -1;
break;
}
if (fd < 0)
return -1;
/* set it up */
fcntl(fd, F_SETFD, FD_CLOEXEC);
fcntl(fd, F_SETFL, O_NONBLOCK);
if (server) {
if (!e->noreuseaddr) {
rc = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &rc, sizeof rc);
}
if (!e->nolisten)
listen(fd, BACKLOG);
}
return fd;
}
struct fdev *afb_socket_open(const char *uri, int server)
{
int fd;
struct fdev *fdev;
fd = open_any(uri, server);
if (fd < 0)
goto error;
fdev = afb_fdev_create(fd);
if (!fdev)
goto error2;
return fdev;
error2:
close(fd);
error:
ERROR("can't make %s socket for %s", server ? "server" : "client", uri);
return NULL;
}
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