bird.c

/*
 * This file is part of BIRD-RTRlib-CLI.
 *
 * BIRD-RTRlib-CLI is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or (at your
 * option) any later version.
 *
 * BIRD-RTRlib-CLI is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with BIRD-RTRlib-CLI; see the file COPYING.
 *
 * written by smlng and Mehmet Ceyran, in cooperation with:
 * CST group, Freie Universitaet Berlin
 * Website: https://github.com/rtrlib/bird-rtrlib-cli
 */

#include <string.h>
#include <syslog.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

#include "bird.h"

int bird_connect(const char *socket_path)
{
    // Result value containing the socket to the BIRD.
    int bird_socket = -1;
    // Socket address to the BIRD.
    struct sockaddr_un addr;
    // Check socket path length.
    if (strlen(socket_path) >= sizeof addr.sun_path) {
        syslog(LOG_EMERG, "Socket path too long");
        return -1;
    }
    // Create socket and bail out on error.
    bird_socket = socket(AF_UNIX, SOCK_STREAM, 0);
    if (bird_socket < 0) {
        syslog(LOG_EMERG, "Socket creation error: %m");
        return -1;
    }
    // Create socket address.
    memset(&addr, 0, sizeof addr);
    addr.sun_family = AF_UNIX;
    strcpy(addr.sun_path, socket_path);
    // Try to connect to BIRD.
    if (connect(bird_socket, (struct sockaddr *) &addr, sizeof addr) == -1) {
        syslog(LOG_EMERG, "BIRD connection to %s failed: %m", socket_path);
        close(bird_socket);
        return -1;
    }
    // Return socket.
    return bird_socket;
}