/*      $NetBSD: pt_tcp.c,v 1.21 2009/04/11 07:36:43 lukem Exp $        */

/*
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: Id: pt_tcp.c,v 1.1 1992/05/25 21:43:09 jsp Exp
 *      @(#)pt_tcp.c    8.5 (Berkeley) 4/28/95
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: pt_tcp.c,v 1.21 2009/04/11 07:36:43 lukem Exp $");
#endif /* not lint */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

#include "portald.h"

/*
 * Key will be tcp/host/port[/"priv"]
 * Create a TCP socket connected to the
 * requested host and port.
 * Some trailing suffix values have special meanings.
 * An unrecognised suffix is an error.
 */
int
portal_tcp(struct portal_cred *pcr, char *key, char **v, int *fdp)
{
        char host[MAXHOSTNAMELEN];
        char port[MAXHOSTNAMELEN];
        char *p = key + (v[1] ? strlen(v[1]) : 0);
        char *q;
        int priv = 0;
        struct addrinfo hints, *res, *lres;
        int so = -1;
        const char *cause = "unknown";

        q = strchr(p, '/');
        if (q == 0 || (size_t)(q - p) >= sizeof(host))
                return (EINVAL);
        *q = '\0';
        if (strlcpy(host, p, sizeof(host)) >= sizeof(host))
                return (EINVAL);
        p = q + 1;

        q = strchr(p, '/');
        if (q)
                *q = '\0';
        if (strlcpy(port, p, sizeof(port)) >= sizeof(port))
                return (EINVAL);
        if (q) {
                p = q + 1;
                if (strcmp(p, "priv") == 0) {
                        if (pcr->pcr_uid == 0)
                                priv = 1;
                        else
                                return (EPERM);
                } else {
                        return (EINVAL);
                }
        }

        memset(&hints, 0, sizeof(hints));
        hints.ai_family = PF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_protocol = 0;
        if (getaddrinfo(host, port, &hints, &res) != 0)
                return(EINVAL);

        for (lres = res; lres; lres = lres->ai_next) {
                if (priv)
                        so = rresvport((int *) 0);
                else
                        so = socket(lres->ai_family, lres->ai_socktype,
                            lres->ai_protocol);
                if (so < 0) {
                        cause = "socket";
                        continue;
                }

                if (connect(so, lres->ai_addr, lres->ai_addrlen) != 0) {
                        cause = "connect";
                        (void)close(so);
                        so = -1;
                        continue;
                }

                *fdp = so;
                errno = 0;
                break;
        }

        if (so < 0)
                syslog(LOG_WARNING, "%s: %m", cause);
                
        freeaddrinfo(res);

        return (errno);
}