src/server/daemon/error.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. 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 in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
 */

#include "error.h"

#include <cx/string.h>
#include "../util/pblock.h"
#include "../util/strbuf.h"

// macro for creating an error string (ucx cxmutstr)
#define ERRMSG(s) { s, sizeof(s)-1 }

static cxmutstr error_400 = ERRMSG("<html><body>bad request</body></html>");
static cxmutstr error_403 = ERRMSG("<html><body>forbidden</body></html>");
static cxmutstr error_404 = ERRMSG("<html><body>not found</body></html>");
static cxmutstr error_500 = ERRMSG("<html><body>server error</body></html>");
static cxmutstr error_503 = ERRMSG("<html><body>service unavailable</body></html>");

static cxmutstr error_std = ERRMSG("<html><body>error</body></html>");

int nsapi_error_request(Session *sn, Request *rq) {
    short status = rq->status_num;
    cxmutstr msg;
    if(status < 400) {
        msg.ptr = NULL;
        msg.length = 0;
    } else {
        switch(status) {
            default: msg = error_std;
            case 403: {
                msg = error_403;
                break;
            }
            case 404: {
                msg = error_404;
                break;
            }
            case 500: {
                msg = error_500;
                break;
            }
        }
    }
    
    pblock_removekey(pb_key_content_type, rq->srvhdrs);
    pblock_removekey(pb_key_content_length, rq->srvhdrs);
    
    pblock_kninsert(pb_key_content_length, msg.length, rq->srvhdrs);
    pblock_nvinsert("content-type", "text/html", rq->srvhdrs);
    http_start_response(sn, rq);
    
    if(msg.length > 0) {
        net_write(sn->csd, msg.ptr, msg.length);
    }
    
    return REQ_PROCEED;
}

void fatal_error(HTTPRequest *req, int status) {
    cxmutstr msg = error_500;
    char *statusmsg = "Internal Server Error";
    switch(status) {
        case 400: {
            msg = error_400;
            statusmsg = "Bad request";
            break;
        }
        case 500: {
            msg = error_500;
            statusmsg = "Internal Server Error";
            break;
        }
        case 503: {
            msg = error_503;
            statusmsg = "Service Unavailable";
            break;
        }
    }
    
    char buf[512];
    int len = snprintf(buf, 512, "HTTP/1.1 %d %s\r\nServer: webserver\r\nContent-type: text/html\r\nContent-length: %zd\r\n\r\n", status, statusmsg, msg.length);
    
    // set socket blocking
    int flags;
    if (-1 == (flags = fcntl(req->connection->fd, F_GETFL, 0))) {
        flags = 0;
    }
    if (fcntl(req->connection->fd, F_SETFL, flags & ~O_NONBLOCK) != 0) {
        // error
    }
    
    req->connection->write(req->connection, buf, len);
    req->connection->write(req->connection, msg.ptr, msg.length);
}