/* $OpenBSD: s_socket.c,v 1.14 2025/01/02 13:10:03 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <sys/socket.h>

#include <netinet/in.h>

#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "apps.h"

#include <openssl/ssl.h>

static int init_server(int *sock, int port, int type);
static int init_server_long(int *sock, int port, char *ip, int type);
static int do_accept(int acc_sock, int *sock);

int
init_client(int *sock, char *host, char *port, int type, int af)
{
        struct addrinfo hints, *ai_top, *ai;
        int i, s = -1;

        memset(&hints, '\0', sizeof(hints));
        hints.ai_family = af;
        hints.ai_socktype = type;

        if ((i = getaddrinfo(host, port, &hints, &ai_top)) != 0) {
                BIO_printf(bio_err, "getaddrinfo: %s\n", gai_strerror(i));
                return (0);
        }
        if (ai_top == NULL || ai_top->ai_addr == NULL) {
                BIO_printf(bio_err, "getaddrinfo returned no addresses\n");
                if (ai_top != NULL) {
                        freeaddrinfo(ai_top);
                }
                return (0);
        }
        for (ai = ai_top; ai != NULL; ai = ai->ai_next) {
                s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
                if (s == -1) {
                        continue;
                }
                if (type == SOCK_STREAM) {
                        i = 0;
                        i = setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
                            (char *) &i, sizeof(i));
                        if (i == -1) {
                                perror("keepalive");
                                goto out;
                        }
                }
                if ((i = connect(s, ai->ai_addr, ai->ai_addrlen)) == 0) {
                        *sock = s;
                        freeaddrinfo(ai_top);
                        return (1);
                }
                close(s);
                s = -1;
        }

        perror("connect");
 out:
        if (s != -1)
                close(s);
        freeaddrinfo(ai_top);
        return (0);
}

int
do_server(int port, int type, int *ret,
    int (*cb)(int s, unsigned char *context),
    unsigned char *context, int naccept)
{
        int sock;
        int accept_socket = 0;
        int i;

        if (!init_server(&accept_socket, port, type))
                return (0);

        if (ret != NULL) {
                *ret = accept_socket;
                /* return(1); */
        }
        for (;;) {
                if (type == SOCK_STREAM) {
                        if (do_accept(accept_socket, &sock) == 0) {
                                shutdown(accept_socket, SHUT_RD);
                                close(accept_socket);
                                return (0);
                        }
                } else
                        sock = accept_socket;
                i = cb(sock, context);
                if (type == SOCK_STREAM) {
                        shutdown(sock, SHUT_RDWR);
                        close(sock);
                }
                if (naccept != -1)
                        naccept--;
                if (i < 0 || naccept == 0) {
                        shutdown(accept_socket, SHUT_RDWR);
                        close(accept_socket);
                        return (i);
                }
        }
}

static int
init_server_long(int *sock, int port, char *ip, int type)
{
        int ret = 0;
        struct sockaddr_in server;
        int s = -1;

        memset((char *) &server, 0, sizeof(server));
        server.sin_family = AF_INET;
        server.sin_port = htons((unsigned short) port);
        if (ip == NULL)
                server.sin_addr.s_addr = INADDR_ANY;
        else
                memcpy(&server.sin_addr.s_addr, ip, 4);

        if (type == SOCK_STREAM)
                s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
        else                    /* type == SOCK_DGRAM */
                s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

        if (s == -1)
                goto err;
#if defined SOL_SOCKET && defined SO_REUSEADDR
        {
                int j = 1;
                if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
                    (void *) &j, sizeof j) == -1) {
                        perror("setsockopt");
                        goto err;
                }
        }
#endif
        if (bind(s, (struct sockaddr *) & server, sizeof(server)) == -1) {
                perror("bind");
                goto err;
        }
        /* Make it 128 for linux */
        if (type == SOCK_STREAM && listen(s, 128) == -1)
                goto err;
        *sock = s;
        ret = 1;
 err:
        if ((ret == 0) && (s != -1)) {
                shutdown(s, SHUT_RD);
                close(s);
        }
        return (ret);
}

static int
init_server(int *sock, int port, int type)
{
        return (init_server_long(sock, port, NULL, type));
}

static int
do_accept(int acc_sock, int *sock)
{
        struct hostent *h1, *h2;
        static struct sockaddr_in from;
        socklen_t len;
        char *host = NULL;
        int ret;

 redoit:

        memset((char *) &from, 0, sizeof(from));
        len = sizeof(from);
        ret = accept(acc_sock, (struct sockaddr *) & from, &len);
        if (ret == -1) {
                if (errno == EINTR) {
                        /* check_timeout(); */
                        goto redoit;
                }
                fprintf(stderr, "errno=%d ", errno);
                perror("accept");
                return (0);
        }

        h1 = gethostbyaddr((char *) &from.sin_addr.s_addr,
            sizeof(from.sin_addr.s_addr), AF_INET);
        if (h1 == NULL) {
                BIO_printf(bio_err, "bad gethostbyaddr\n");
        } else {
                if ((host = strdup(h1->h_name)) == NULL) {
                        perror("strdup");
                        close(ret);
                        return (0);
                }

                h2 = gethostbyname(host);
                if (h2 == NULL) {
                        BIO_printf(bio_err, "gethostbyname failure\n");
                        close(ret);
                        free(host);
                        return (0);
                }
                if (h2->h_addrtype != AF_INET) {
                        BIO_printf(bio_err, "gethostbyname addr is not AF_INET\n");
                        close(ret);
                        free(host);
                        return (0);
                }
        }

        free(host);
        *sock = ret;
        return (1);
}

int
extract_host_port(char *str, char **host_ptr, unsigned char *ip,
    char **port_ptr)
{
        char *h, *p;

        h = str;
        p = strrchr(str, '/');  /* IPv6 host/port */
        if (p == NULL) {
                p = strrchr(str, ':');
        }
        if (p == NULL) {
                BIO_printf(bio_err, "no port defined\n");
                return (0);
        }
        *(p++) = '\0';

        if (host_ptr != NULL)
                *host_ptr = h;

        if (port_ptr != NULL && p != NULL && *p != '\0')
                *port_ptr = p;

        return (1);
}

int
extract_port(char *str, short *port_ptr)
{
        int i;
        const char *errstr;
        struct servent *s;

        i = strtonum(str, 1, 65535, &errstr);
        if (!errstr) {
                *port_ptr = (unsigned short) i;
        } else {
                s = getservbyname(str, "tcp");
                if (s == NULL) {
                        BIO_printf(bio_err, "getservbyname failure for %s\n", str);
                        return (0);
                }
                *port_ptr = ntohs((unsigned short) s->s_port);
        }
        return (1);
}