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|
/*-
* Simple_HTTPd v1.1 - a very small, barebones HTTP server
*
* Copyright (c) 1998-1999 Marc Nicholas <marc@netstor.com>
* All rights reserved.
*
* Major rewrite by William Lloyd <wlloyd@slap.net>
*
* 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 AUTHOR 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 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.
*
* $FreeBSD$
*/
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
int http_port = 80;
int daemonize = 1;
int verbose = 0;
int http_sock, con_sock;
char fetch_mode[100];
char homedir[100];
char logfile[80];
char *adate();
struct hostent *hst;
struct sockaddr_in source;
/* HTTP basics */
static char httpd_server_ident[] = "Server: FreeBSD/PicoBSD simple_httpd 1.1\r";
static char http_200[] = "HTTP/1.0 200 OK\r";
/* Two parts, HTTP Header and then HTML */
static char *http_404[2] =
{"HTTP/1.0 404 Not found\r\n",
"<HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY><H1>Error 404</H1>\
Not found - file doesn't exist or you do not have permission.\n</BODY></HTML>\r\n"
};
static char *http_405[2] =
{"HTTP/1.0 405 Method Not allowed\r\nAllow: GET,HEAD\r\n",
"<HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY><H1>Error 405</H1>\
This server only supports GET and HEAD requests.\n</BODY></HTML>\r\n"
};
/*
* Only called on initial invocation
*/
void
init_servconnection(void)
{
struct sockaddr_in server;
/* Create a socket */
http_sock = socket(AF_INET, SOCK_STREAM, 0);
if (http_sock < 0) {
perror("socket");
exit(1);
}
server.sin_family = AF_INET;
server.sin_port = htons(http_port);
server.sin_addr.s_addr = INADDR_ANY;
if (bind(http_sock, (struct sockaddr *) & server, sizeof(server)) < 0) {
perror("bind socket");
exit(1);
}
if (verbose) printf("simple_httpd\n",http_port);
}
/*
* Wait here until we see an incoming http request
*/
wait_connection(void)
{
int lg;
lg = sizeof(struct sockaddr_in);
con_sock = accept(http_sock, (struct sockaddr *) & source, &lg);
if (con_sock <= 0) {
perror("accept");
exit(1);
}
}
/*
* Print timestamp for HTTP HEAD and GET
*/
http_date()
{
time_t tl;
char buff[50];
tl = time(NULL);
strftime(buff, 50, "Date: %a, %d %h %Y %H:%M:%S %Z\r\n", gmtime(&tl));
write(con_sock, buff, strlen(buff));
//return(buff);
}
/*
* Send data to the open socket
*/
http_output(char *html)
{
write(con_sock, html, strlen(html));
write(con_sock, "\r\n", 2);
}
/*
* Create and write the log information to file
* Log file format is one line per entry
*/
log_line(char *req)
{
char log_buff[256];
char msg[1024];
char env_host[80], env_addr[80];
long addr;
FILE *log;
strcpy(log_buff,inet_ntoa(source.sin_addr));
sprintf(env_addr, "REMOTE_ADDR=%s",log_buff);
addr=inet_addr(log_buff);
strcpy(msg,adate());
strcat(msg," ");
hst=gethostbyaddr((char*) &addr, 4, AF_INET);
/* If DNS hostname exists */
if (hst) {
strcat(msg,hst->h_name);
sprintf(env_host, "REMOTE_HOST=%s",hst->h_name);
}
strcat(msg," (");
strcat(msg,log_buff);
strcat(msg,") ");
strcat(msg,req);
if (daemonize) {
log=fopen(logfile,"a");
fprintf(log,"%s\n",msg);
fclose(log);
} else
printf("%s\n",msg);
/* This is for CGI scripts */
putenv(env_addr);
putenv(env_host);
}
/*
* We have a connection. Identify what type of request GET, HEAD, CGI, etc
* and do what needs to be done
*/
http_request()
{
int fd, lg, ld, i;
int cmd = 0;
int http1 = 0;
char *p, *par;
char *filename, *c;
struct stat file_status;
char req[1024];
char msg[1024];
char buff[8192];
lg = read(con_sock, req, 1024);
if (p=strstr(req,"\n")) *p=0;
if (p=strstr(req,"\r")) *p=0;
log_line(req);
c = strtok(req, " ");
/* Error msg if request is nothing */
if (c == NULL) {
http_output(http_404[0]);
http_output(http_404[1]);
goto end_request;
}
if (strncmp(c, "GET", 3) == 0) cmd = 1;
if (strncmp(c, "HEAD", 4) == 0) cmd = 2;
/* Do error msg for any other type of request */
if (cmd == 0) {
http_output(http_405[0]);
http_output(http_405[1]);
goto end_request;
}
filename = strtok(NULL, " ");
c = strtok(NULL, " ");
if (fetch_mode[0] != NULL) strcpy(filename,fetch_mode);
if (filename == NULL ||
strlen(filename)==1) filename="/index.html";
while (filename[0]== '/') filename++;
/* CGI handling. Untested */
if (!strncmp(filename,"cgi-bin/",8))
{
par=0;
if (par=strstr(filename,"?"))
{
*par=0;
par++;
}
if (access(filename,X_OK)) goto conti;
stat (filename,&file_status);
if (setuid(file_status.st_uid)) return(0);
if (seteuid(file_status.st_uid)) return(0);
if (!fork())
{
close(1);
dup(con_sock);
//printf("HTTP/1.0 200 OK\nContent-type: text/html\n\n\n");
printf("HTTP/1.0 200 OK\r\n");
/* Plug in environment variable, others in log_line */
putenv("SERVER_SOFTWARE=FreeBSD/PicoBSD");
execlp (filename,filename,par,0);
}
wait(&i);
return(0);
}
conti:
if (filename == NULL) {
http_output(http_405[0]);
http_output(http_405[1]);
goto end_request;
}
/* End of CGI handling */
/* Reject any request with '..' in it, bad hacker */
c = filename;
while (*c != '\0')
if (c[0] == '.' && c[1] == '.') {
http_output(http_404[0]);
http_output(http_404[1]);
goto end_request;
} else
c++;
/* Open filename */
fd = open(filename, O_RDONLY);
if (fd < 0) {
http_output(http_404[0]);
http_output(http_404[1]);
goto end_request;
}
/* Get file status information */
if (fstat(fd, &file_status) < 0) {
http_output(http_404[0]);
http_output(http_404[1]);
goto end_request;
}
/* Is it a regular file? */
if (!S_ISREG(file_status.st_mode)) {
http_output(http_404[0]);
http_output(http_404[1]);
goto end_request;
}
/* Past this point we are serving either a GET or HEAD */
/* Print all the header info */
http_output(http_200);
http_output(httpd_server_ident);
http_date();
sprintf(buff, "Content-length: %d\r\n", file_status.st_size);
if (strstr(filename,".txt")) {
strcpy(buff,"Content-type: text/plain\r\n");
} else if (strstr(filename,".html") || strstr(filename,".htm")) {
strcpy(buff,"Content-type: text/html\r\n");
} else if (strstr(filename,".gif")) {
strcpy(buff,"Content-type: image/gif\r\n");
} else if (strstr(filename,".jpg")) {
strcpy(buff,"Content-type: image/jpeg\r\n");
} else {
/* Take a guess at content if we don't have something already */
strcpy(buff,"Content-type: ");
strcat(buff,strstr(filename,".")+1);
strcat(buff,"\r\n");
}
write(con_sock, buff, strlen(buff));
strftime(buff, 50, "Last-Modified: %a, %d %h %Y %H:%M:%S %Z\r\n\r\n", gmtime(&file_status.st_mtime));
write(con_sock, buff, strlen(buff));
/* Send data only if GET request */
if (cmd == 1) {
while (lg = read(fd, buff, 8192))
write(con_sock, buff, lg);
}
end_request:
close(fd);
close(con_sock);
}
/*
* Simple httpd server for use in PicoBSD or other embedded application.
* Should satisfy simple httpd needs. For more demanding situations
* apache is probably a better (but much larger) choice.
*/
main(int argc, char *argv[])
{
extern char *optarg;
extern int optind;
int bflag, ch, fd, ld;
int lg;
int httpd_group = 65534;
pid_t server_pid;
/* Default for html directory */
strcpy (homedir,getenv("HOME"));
if (!geteuid()) strcpy (homedir,"/httphome");
else strcat (homedir,"/httphome");
/* Defaults for log file */
if (geteuid()) {
strcpy(logfile,getenv("HOME"));
strcat(logfile,"/");
strcat(logfile,"jhttp.log");
} else
strcpy(logfile,"/var/log/jhttpd.log");
/* Parse command line arguments */
while ((ch = getopt(argc, argv, "d:f:g:l:p:vDh")) != -1)
switch (ch) {
case 'd':
strcpy(homedir,optarg);
break;
case 'f':
daemonize = 0;
verbose = 1;
strcpy(fetch_mode,optarg);
break;
case 'g':
httpd_group = atoi(optarg);
break;
case 'l':
strcpy(logfile,optarg);
break;
case 'p':
http_port = atoi(optarg);
break;
case 'v':
verbose = 1;
break;
case 'D':
daemonize = 0;
break;
case '?':
case 'h':
default:
printf("usage: simple_httpd [[-d directory][-g grpid][-l logfile][-p port][-vD]]\n");
exit(1);
/* NOTREACHED */
}
/* Not running as root and no port supplied, assume 1080 */
if ((http_port == 80) && geteuid()) {
http_port = 1080;
}
/* Do we really have rights in the html directory? */
if (fetch_mode[0] == NULL) {
if (chdir(homedir)) {
perror("chdir");
puts(homedir);
exit(1);
}
}
/* Create log file if it doesn't exit */
if ((access(logfile,W_OK)) && daemonize) {
ld = open (logfile,O_WRONLY);
chmod (logfile,00600);
close(ld);
}
init_servconnection();
if (verbose) {
printf("Server started with options \n");
printf("port: %d\n",http_port);
if (fetch_mode[0] == NULL) printf("html home: %s\n",homedir);
if (daemonize) printf("logfile: %s\n",logfile);
}
/* httpd is spawned */
if (daemonize) {
if (server_pid = fork()) {
wait3(0,WNOHANG,0);
if (verbose) printf("pid: %d\n",server_pid);
exit(0);
}
wait3(0,WNOHANG,0);
}
if (fetch_mode[0] == NULL) setpgrp(0,httpd_group);
/* How many connections do you want?
* Keep this lower than the available number of processes
*/
if (listen(http_sock,15) < 0) exit(1);
label:
wait_connection();
if (fork()) {
wait3(0,WNOHANG,0);
close(con_sock);
goto label;
}
http_request();
wait3(0,WNOHANG,0);
exit(0);
}
char *adate()
{
static char out[50];
long now;
struct tm *t;
time(&now);
t = localtime(&now);
sprintf(out, "%02d:%02d:%02d %02d/%02d/%02d",
t->tm_hour, t->tm_min, t->tm_sec,
t->tm_mday, t->tm_mon+1, t->tm_year );
return out;
}
|
