/*      $NetBSD: main.c,v 1.31 2023/06/07 20:12:31 mrg Exp $    */

/*      $eterna: main.c,v 1.6 2011/11/18 09:21:15 mrg Exp $     */
/* from: eterna: bozohttpd.c,v 1.159 2009/05/23 02:14:30 mrg Exp        */

/*
 * Copyright (c) 1997-2023 Matthew R. Green
 * All rights reserved.
 *
 * 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 and
 *    dedication in the documentation and/or other materials provided
 *    with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 *
 */

/* this program is dedicated to the Great God of Processed Cheese */

/*
 * main.c:  C front end to bozohttpd
 */

#include <sys/types.h>
#include <sys/param.h>

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>

#include "bozohttpd.h"

/* variables and functions */
#ifndef LOG_FTP
#define LOG_FTP LOG_DAEMON
#endif

/* print a usage message, and then exit */
BOZO_DEAD static void
usage(bozohttpd_t *httpd, char *progname)
{
        bozowarn(httpd, "usage: %s [options] slashdir [virtualhostname]",
                        progname);
        bozowarn(httpd, "options:");

        if (have_daemon_mode)
                bozowarn(httpd, "   -b\t\t\tbackground in daemon mode");
        if (have_cgibin &&
            have_dynamic_content)
                bozowarn(httpd, "   -C suffix handler\tadd this CGI handler "
                                "for paths ending with `suffix'");
        if (have_cgibin)
                bozowarn(httpd, "   -c cgibin\t\tenable cgi-bin support in "
                                "this directory");
        if (have_debug)
                bozowarn(httpd, "   -d\t\t\tenable debug support");
        if (have_user &&
            have_cgibin)
                bozowarn(httpd, "   -E\t\t\tenable CGI support for user dirs");
        if (have_core)
                bozowarn(httpd, "   -e\t\t\tdon't clean the environment "
                                "(-t and -U only)");
        if (have_daemon_mode)
                bozowarn(httpd, "   -f\t\t\tforeground in daemon mode");
        if (have_core)
                bozowarn(httpd, "   -G\t\t\tprint version number and exit");
        if (have_dirindex)
                bozowarn(httpd, "   -H\t\t\thide files starting with a period "
                                "(.) in index mode");
        if (have_core)
                bozowarn(httpd, "   -I port\t\tbind or use on this port");
        if (have_daemon_mode)
                bozowarn(httpd, "   -i address\t\tbind on this address "
                                "(daemon mode only)");
        if (have_lua)
                bozowarn(httpd, "   -L prefix script\tadd this Lua script for "
                                "paths starting with `prefix'");
        if (have_dynamic_content)
                bozowarn(httpd, "   -M suffix t c c11\tadd this mime entry");
        if (have_core)
                bozowarn(httpd, "   -n\t\t\tdon't resolve host names");
        if (have_daemon_mode)
                bozowarn(httpd, "   -P pidfile\t\tpid file path");
        if (have_user)
                bozowarn(httpd, "   -p dir\t\t\"public_html\" directory name");
        if (have_core)
                bozowarn(httpd, "   -q\t\tquiet mode, no logging");
        if (have_dirindex)
                bozowarn(httpd, "   -R readme\t\tput readme file in footer "
                                "of directory index");
        if (have_core) {
                bozowarn(httpd, "   -S version\t\tset server version string");
                bozowarn(httpd, "   -s\t\t\talways log to stderr");
                bozowarn(httpd, "   -T type timeout\t"
                                "set <ssl|initial|header|request> timeout");
                bozowarn(httpd, "   -t dir\t\tchroot to `dir'");
                bozowarn(httpd, "   -U user\t\tchange user to `user'");
        }
        if (have_user)
                bozowarn(httpd, "   -u\t\t\tenable ~user/public_html support");
        if (have_core) {
                bozowarn(httpd, "   -V\t\t\tUnknown virtual hosts go to "
                                "`slashdir'");
                bozowarn(httpd, "   -v virtualroot\tenable virtual host "
                                "support in this directory");
        }
        if (have_dirindex)
                bozowarn(httpd, "   -X\t\t\tdirectory index support");
        if (have_core)
                bozowarn(httpd, "   -x index\t\tdefault \"index.html\" "
                                "file name");
        if (have_ssl) {
                bozowarn(httpd, "   -Z cert privkey\tspecify path to server "
                                "certificate and private key file\n"
                                "\t\t\tin pem format and enable bozohttpd in "
                                "SSL mode");
                bozowarn(httpd, "   -z ciphers\t\tspecify SSL ciphers");
        }

        bozoerr(httpd, 1, "%s failed to start", progname);
}

int
main(int argc, char **argv)
{
        bozo_httpreq_t  *request;
        bozohttpd_t      httpd;
        bozoprefs_t      prefs;
        char            *progname;
        const char      *val;
        int              c;

        (void) memset(&httpd, 0x0, sizeof(httpd));
        (void) memset(&prefs, 0x0, sizeof(prefs));

        if ((progname = strrchr(argv[0], '/')) == NULL)
                progname = argv[0];
        else
                progname++;

        openlog(progname, LOG_PID|LOG_NDELAY, LOG_FTP);

        bozo_set_defaults(&httpd, &prefs);

        /*
         * -r option was removed, do not reuse it for a while
         */

        while ((c = getopt(argc, argv,
            "C:EGHI:L:M:m:P:R:S:T:U:VXZ:bc:defhi:np:qst:uv:x:z:")) != -1) {
                switch (c) {

                case 'b':
                        if (!have_daemon_mode)
 no_daemon_mode:
                                bozoerr(&httpd, 1, "Daemon mode not enabled");

                        /*
                         * test suite support - undocumented
                         * background == 2 (aka, -b -b) means to
                         * only process 1 per kid
                         */
                        val = bozo_get_pref(&prefs, "background") == NULL ?
                            "1" : "2";
                        bozo_set_pref(&httpd, &prefs, "background", val);
                        break;

                case 'C':
                        if (!have_dynamic_content ||
                            !have_cgibin)
                                bozoerr(&httpd, 1,
                                    "dynamic CGI handler support not enabled");

                        /* make sure there's two arguments */
                        if (argc - optind < 1)
                                usage(&httpd, progname);
                        bozo_add_content_map_cgi(&httpd, optarg,
                                        argv[optind++]);
                        break;

                case 'c':
                        if (!have_cgibin)
                                bozoerr(&httpd, 1, "CGI not enabled");

                        bozo_cgi_setbin(&httpd, optarg);
                        break;

                case 'd':
                        if (!have_debug)
                                bozowarn(&httpd, "Debugging not enabled");
                        httpd.debug++;
                        break;

                case 'E':
                        if (!have_user ||
                            !have_cgibin)
                                bozoerr(&httpd, 1, "CGI not enabled");

                        bozo_set_pref(&httpd, &prefs, "enable user cgibin",
                                      "true");
                        break;

                case 'e':
                        bozo_set_pref(&httpd, &prefs, "dirty environment",
                                      "true");
                        break;

                case 'f':
                        if (!have_daemon_mode)
                                goto no_daemon_mode;

                        bozo_set_pref(&httpd, &prefs, "foreground", "true");
                        break;

                case 'G':
                        {
                                char    version[128];

                                bozo_get_version(version, sizeof(version));
                                printf("bozohttpd version %s\n", version);
                        }
                        return 0;

                case 'H':
                        if (!have_dirindex)
 no_dirindex_support:
                                bozoerr(&httpd, 1,
                                        "directory indexing not enabled");

                        bozo_set_pref(&httpd, &prefs, "hide dots", "true");
                        break;

                case 'I':
                        bozo_set_pref(&httpd, &prefs, "port number", optarg);
                        break;

                case 'i':
                        if (!have_daemon_mode)
                                goto no_daemon_mode;

                        bozo_set_pref(&httpd, &prefs, "bind address", optarg);
                        break;

                case 'L':
                        if (!have_lua)
                                bozoerr(&httpd, 1, "Lua support not enabled");

                        /* make sure there's two argument */
                        if (argc - optind < 1)
                                usage(&httpd, progname);
                        bozo_add_lua_map(&httpd, optarg, argv[optind]);
                        optind++;
                        break;

                case 'M':
                        if (!have_dynamic_content)
                                bozoerr(&httpd, 1,
                                    "dynamic mime content support not enabled");

                        /* make sure there're four arguments */
                        if (argc - optind < 3)
                                usage(&httpd, progname);
                        bozo_add_content_map_mime(&httpd, optarg, argv[optind],
                            argv[optind+1], argv[optind+2]);
                        optind += 3;
                        break;

                case 'm':
                        if (!have_ssl)
                                goto no_ssl;

                        httpd.ssl_min_proto = optarg;
                        debug((&httpd, DEBUG_NORMAL,
                            "using minimum protocol version: %s", optarg));
                        break;

                case 'n':
                        bozo_set_pref(&httpd, &prefs, "numeric", "true");
                        break;

                case 'P':
                        if (!have_daemon_mode)
                                goto no_daemon_mode;

                        bozo_set_pref(&httpd, &prefs, "pid file", optarg);
                        break;

                case 'p':
                        if (!have_user)
 no_user_support:
                                bozoerr(&httpd, 1, "User support not enabled");

                        bozo_set_pref(&httpd, &prefs, "public_html", optarg);
                        break;

                case 'q':
                        bozo_set_pref(&httpd, &prefs, "no log", "true");
                        break;

                case 'R':
                        if (!have_dirindex)
                                goto no_dirindex_support;

                        bozo_set_pref(&httpd, &prefs, "directory index readme",
                                      optarg);
                        break;

                case 'S':
                        bozo_set_pref(&httpd, &prefs, "server software",
                                      optarg);
                        break;

                case 's':
                        bozo_set_pref(&httpd, &prefs, "log to stderr", "true");
                        break;

                case 'T':
                        /* make sure there're two arguments */
                        if (argc - optind < 1)
                                usage(&httpd, progname);
                        if (bozo_set_timeout(&httpd, &prefs,
                                             optarg, argv[optind])) {
                                bozoerr(&httpd, 1,
                                        "invalid type '%s'", optarg);
                                /* NOTREACHED */
                        }
                        optind++;
                        break;

                case 't':
                        bozo_set_pref(&httpd, &prefs, "chroot dir", optarg);
                        break;

                case 'U':
                        bozo_set_pref(&httpd, &prefs, "username", optarg);
                        break;

                case 'u':
                        if (!have_user)
                                goto no_user_support;

                        bozo_set_pref(&httpd, &prefs, "enable users", "true");
                        break;

                case 'V':
                        bozo_set_pref(&httpd, &prefs, "unknown slash", "true");
                        break;

                case 'v':
                        bozo_set_pref(&httpd, &prefs, "virtual base", optarg);
                        break;

                case 'X':
                        if (!have_dirindex)
                                goto no_dirindex_support;

                        bozo_set_pref(&httpd, &prefs, "directory indexing",
                                      "true");
                        break;

                case 'x':
                        bozo_set_pref(&httpd, &prefs, "index.html", optarg);
                        break;

                case 'Z':
                        if (!have_ssl)
 no_ssl:
                                bozoerr(&httpd, 1, "ssl support not enabled");

                        /* make sure there's two arguments */
                        if (argc - optind < 1)
                                usage(&httpd, progname);
                        bozo_ssl_set_opts(&httpd, optarg, argv[optind++]);
                        break;

                case 'z':
                        if (!have_ssl)
                                goto no_ssl;

                        bozo_ssl_set_ciphers(&httpd, optarg);
                        break;

                default:
                        usage(&httpd, progname);
                        /* NOTREACHED */
                }
        }

        argc -= optind;
        argv += optind;

        if (argc == 0 || argc > 2) {
                usage(&httpd, progname);
        }

        /* virtual host, and root of tree to serve */
        bozo_setup(&httpd, &prefs, argv[1], argv[0]);

        /*
         * read and process the HTTP request.
         */
        do {
                if ((request = bozo_read_request(&httpd)) != NULL) {
                        bozo_process_request(request);
                        bozo_clean_request(request);
                }
        } while (httpd.background);

        bozo_cleanup(&httpd, &prefs);

        return (0);
}