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/*
* Copyright 2015 Steven Barth <steven at midlink.org>
*
* 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.
*
*/
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <net/if.h>
#include <unistd.h>
#include <libubox/uloop.h>
#include <libubox/blobmsg.h>
#include "omcproxy.h"
#include "proxy.h"
enum {
PROXY_ATTR_SOURCE,
PROXY_ATTR_SCOPE,
PROXY_ATTR_DEST,
PROXY_ATTR_MAX,
};
static struct blobmsg_policy proxy_policy[PROXY_ATTR_MAX] = {
[PROXY_ATTR_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
[PROXY_ATTR_SCOPE] = { .name = "scope", .type = BLOBMSG_TYPE_STRING },
[PROXY_ATTR_DEST] = { .name = "dest", .type = BLOBMSG_TYPE_ARRAY },
};
static int handle_proxy_set(void *data, size_t len)
{
struct blob_attr *tb[PROXY_ATTR_MAX], *c;
blobmsg_parse(proxy_policy, PROXY_ATTR_MAX, tb, data, len);
const char *name = ((c = tb[PROXY_ATTR_SOURCE])) ? blobmsg_get_string(c) : NULL;
int uplink = 0;
int downlinks[32] = {0};
size_t downlinks_cnt = 0;
enum proxy_flags flags = 0;
if (!name)
return -EINVAL;
if (!(uplink = if_nametoindex(name))) {
L_WARN("%s(%s): %s", __FUNCTION__, name, strerror(errno));
return -errno;
}
if ((c = tb[PROXY_ATTR_SCOPE])) {
const char *scope = blobmsg_get_string(c);
if (!strcmp(scope, "global"))
flags = PROXY_GLOBAL;
else if (!strcmp(scope, "organization"))
flags = PROXY_ORGLOCAL;
else if (!strcmp(scope, "site"))
flags = PROXY_SITELOCAL;
else if (!strcmp(scope, "admin"))
flags = PROXY_ADMINLOCAL;
else if (!strcmp(scope, "realm"))
flags = PROXY_REALMLOCAL;
if (!flags) {
L_WARN("%s(%s): invalid scope (%s)", __FUNCTION__, name, scope);
return -EINVAL;
}
}
if ((c = tb[PROXY_ATTR_DEST])) {
struct blob_attr *d;
unsigned rem;
blobmsg_for_each_attr(d, c, rem) {
if (downlinks_cnt >= 32) {
L_WARN("%s(%s): maximum number of destinations exceeded", __FUNCTION__, name);
return -EINVAL;
}
const char *n = blobmsg_type(d) == BLOBMSG_TYPE_STRING ? blobmsg_get_string(d) : "";
if (!(downlinks[downlinks_cnt++] = if_nametoindex(n))) {
L_WARN("%s(%s): %s (%s)", __FUNCTION__, name, strerror(errno), blobmsg_get_string(d));
return -errno;
}
}
}
return proxy_set(uplink, downlinks, downlinks_cnt, flags);
}
static void handle_signal(__unused int signal)
{
uloop_end();
}
static void usage(const char *arg) {
fprintf(stderr, "Usage: %s [options] <proxy1> [<proxy2>] [...]\n"
"\nProxy examples:\n"
"eth1,eth2\n"
"eth1,eth2,eth3,scope=organization\n"
"\nProxy options (each option may only occur once):\n"
" <interface> interfaces to proxy (first is uplink)\n"
" scope=<scope> minimum multicast scope to proxy\n"
" [global,organization,site,admin,realm] (default: global)\n"
"\nOptions:\n"
" -v verbose logging\n"
" -h show this help\n",
arg);
}
int main(int argc, char **argv) {
signal(SIGINT, handle_signal);
signal(SIGTERM, handle_signal);
signal(SIGHUP, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
openlog("omcproxy", LOG_PERROR | LOG_PID, LOG_DAEMON);
setlogmask(LOG_UPTO(L_LEVEL));
if (getuid()) {
L_ERR("must be run as root!");
return 2;
}
uloop_init();
bool start = true;
for (ssize_t i = 1; i < argc; ++i) {
const char *source = NULL;
const char *scope = NULL;
struct blob_buf b = {NULL, NULL, 0, NULL};
if (!strcmp(argv[i], "-h")) {
usage(argv[0]);
return 1;
} else if (!strncmp(argv[i], "-v", 2)) {
int log_level;
if ((log_level = atoi(&argv[i][2])) <= 0)
log_level = LOG_DEBUG;
setlogmask(LOG_UPTO(log_level));
continue;
}
blob_buf_init(&b, 0);
void *k = blobmsg_open_array(&b, "dest");
for (char *c = strtok(argv[i], ","); c; c = strtok(NULL, ",")) {
if (!strncmp(c, "scope=", 6)) {
scope = &c[6];
} else if (!source) {
source = c;
} else {
blobmsg_add_string(&b, NULL, c);
}
}
blobmsg_close_array(&b, k);
if (source)
blobmsg_add_string(&b, "source", source);
if (scope)
blobmsg_add_string(&b, "scope", scope);
if (handle_proxy_set(blob_data(b.head), blob_len(b.head))) {
fprintf(stderr, "failed to setup proxy: %s\n", argv[i]);
start = false;
}
blob_buf_free(&b);
}
if (argc < 2) {
usage(argv[0]);
start = false;
}
if (start)
uloop_run();
proxy_update(true);
proxy_flush();
uloop_done();
return 0;
}
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