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nullserv.c
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/*
A minimal webserver for serving up null content.
Copyright (c) 2013 Flexion.Org, http://flexion.org.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
//#include <syslog.h>
static const unsigned char null_gif[] =
{
0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x01, 0x00, 0x01, 0x00, 0xf0, 0x00, 0x00, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x21, 0xf9, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x01, 0x00, 0x00, 0x02, 0x02, 0x44, 0x01, 0x00, 0x3b
};
static const unsigned char null_png[] =
{
0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x25, 0xdb, 0x56,
0xca, 0x00, 0x00, 0x00, 0x03, 0x73, 0x42, 0x49, 0x54, 0x08, 0x08, 0x08, 0xdb, 0xe1, 0x4f, 0xe0,
0x00, 0x00, 0x00, 0x06, 0x50, 0x4c, 0x54, 0x45, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x55, 0xc2,
0xd3, 0x7e, 0x00, 0x00, 0x00, 0x02, 0x74, 0x52, 0x4e, 0x53, 0x00, 0xff, 0x5b, 0x91, 0x22, 0xb5,
0x00, 0x00, 0x00, 0x0a, 0x49, 0x44, 0x41, 0x54, 0x08, 0x99, 0x63, 0x60, 0x00, 0x00, 0x00, 0x02,
0x00, 0x01, 0xf4, 0x71, 0x64, 0xa6, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42,
0x60, 0x82
};
static const unsigned char null_jpg[] =
{
0xff, 0xd8, 0xff, 0xdb, 0x00, 0x43, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xff, 0xc0, 0x00, 0x0b, 0x08, 0x00, 0x01, 0x00, 0x01,
0x01, 0x01, 0x11, 0x00, 0xff, 0xc4, 0x00, 0x14, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0xff, 0xc4, 0x00, 0x14, 0x10, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xda, 0x00, 0x08, 0x01, 0x01, 0x00, 0x00, 0x3f, 0x00, 0x7f, 0x0f, 0xff, 0xd9
};
static const unsigned char null_swf[] =
{
0x88, 0x08, 0x02, 0x35, 0x00, 0x42, 0x75, 0x66, 0x66, 0x65, 0x72, 0x00, 0x4E, 0x61, 0x74, 0x69,
0x76, 0x65, 0x00, 0x6C, 0x6F, 0x61, 0x64, 0x00, 0x42, 0x75, 0x66, 0x66, 0x65, 0x72, 0x5F, 0x6C,
0x6F, 0x61, 0x64, 0x00, 0x70, 0x72, 0x6F, 0x74, 0x6F, 0x74, 0x79, 0x70, 0x65, 0x00, 0x64, 0x69,
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0x17, 0x1D, 0x96, 0x02, 0x00, 0x08, 0x15, 0x9B, 0x07, 0x00, 0x00, 0x01, 0x00, 0x73, 0x00, 0x27,
0x00, 0x96, 0x02, 0x00, 0x08, 0x32, 0x1C, 0x12, 0x9D, 0x02, 0x00, 0x1B, 0x00, 0x96, 0x04, 0x00,
0x08, 0x34, 0x08, 0x32, 0x1C, 0x47, 0x96, 0x07, 0x00, 0x07, 0x01, 0x00, 0x00, 0x00, 0x08, 0x01,
0x1C, 0x96, 0x02, 0x00, 0x08, 0x31, 0x52, 0x17, 0x1D, 0x00
};
static const unsigned char null_text[] = "";
static const char* TEXT_PLAIN = "text/plain";
#define DEFAULT_MIMETYPE TEXT_PLAIN;
inline void send_headers(const char* mime_type, int length)
{
printf("%s %d %s\r\n", "HTTP/1.0", 200, "OK");
printf("Server: %s\r\n", "nullserv");
if (mime_type)
printf("Content-Type: %s\r\n", mime_type);
if (length >= 0)
printf("Content-Length: %d\r\n", length);
printf("Connection: close\r\n");
printf("\r\n");
}
inline const char* get_mime_type(const char* ext)
{
if (!ext) return DEFAULT_MIMETYPE;
if (!strcasecmp(ext, ".gif")) return "image/gif";
if (!strcasecmp(ext, ".png")) return "image/png";
if (!strcasecmp(ext, ".jpg") || !strcasecmp(ext, ".jpeg")) return "image/jpeg";
if (!strcasecmp(ext, ".swf")) return "application/x-shockwave-flash";
if (!strcasecmp(ext, ".js" ) || !strcasecmp(ext, ".ajax")) return "text/javascript";
if (!strcasecmp(ext, ".htm") || !strcasecmp(ext, ".html")) return "text/html";
if (!strcasecmp(ext, ".css")) return "text/css";
if (!strcasecmp(ext, ".php")) return TEXT_PLAIN;
if (!strcasecmp(ext, ".asp") || !strcasecmp(ext, ".aspx")) return TEXT_PLAIN;
if (!strcasecmp(ext, ".cgi") || !strcasecmp(ext, ".pl" )) return TEXT_PLAIN;
if (!strcasecmp(ext, ".txt")) return TEXT_PLAIN;
return DEFAULT_MIMETYPE;
}
int main(int argc, char** argv)
{
char buf[4096];
char* method;
char* path;
char* protocol;
char* querystring;
char* file;
const char* ext;
const char* mime_type;
size_t size;
const unsigned char* content;
// setlogmask (LOG_UPTO (LOG_NOTICE));
// openlog ("nullserv", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_USER);
if (!fgets(buf, sizeof(buf), stdin))
{
// syslog(LOG_NOTICE, "Failed to read from stdin (nothing to read?)");
// closelog();
return -1;
}
// Get the individual bits of the request
method = strtok(buf, " ");
path = strtok(NULL, " ");
protocol = strtok(NULL, "\r");
// Get the request file extenstion and mime type.
file = strtok(path, "?");
ext = strrchr(file, '.');
mime_type = get_mime_type(ext);
// Parse querystring if there is one.
querystring = strstr(path, "?");
if (querystring) ++querystring;
/*
syslog(LOG_NOTICE, "argc : %d", argc);
syslog(LOG_NOTICE, "buf : %s", buf);
syslog(LOG_NOTICE, "\tProtocol : %s %s", protocol, method);
syslog(LOG_NOTICE, "\tPath : %s", path);
syslog(LOG_NOTICE, "\tFile : %s", file);
syslog(LOG_NOTICE, "\tExt : %s", ext);
syslog(LOG_NOTICE, "\tQuery : %s", querystring);
syslog(LOG_NOTICE, "\tMimeType : %s", mime_type);
closelog();
*/
// Server up some null content.
if (!strcasecmp(mime_type, TEXT_PLAIN) ||
!strcasecmp(mime_type, "text/html") ||
!strcasecmp(mime_type, "text/css") ||
!strcasecmp(mime_type, "text/javascript"))
{
content = null_text;
size = sizeof(null_text);
}
else if (!strcasecmp(mime_type, "image/gif"))
{
content = null_gif;
size = sizeof(null_gif);
}
else if (!strcasecmp(mime_type, "image/png"))
{
content = null_png;
size = sizeof(null_png);
}
else if (!strcasecmp(mime_type, "image/jpeg"))
{
content = null_jpg;
size = sizeof(null_jpg);
}
else if (!strcasecmp(mime_type, "application/x-shockwave-flash"))
{
content = null_swf;
size = sizeof(null_swf);
}
else
{
content = null_text;
size = sizeof(null_text);
}
send_headers(mime_type, (size - 1));
fwrite(content, 1, (size - 1), stdout);
return 0;
}