simple_httpd.c revision 133836 
143939Sabial/*-
246493Sabial * Simple_HTTPd v1.1 - a very small, barebones HTTP server
343939Sabial *
443939Sabial * Copyright (c) 1998-1999 Marc Nicholas <marc@netstor.com>
543939Sabial * All rights reserved.
643939Sabial *
746493Sabial * Major rewrite by William Lloyd <wlloyd@slap.net>
846493Sabial *
943939Sabial * Redistribution and use in source and binary forms, with or without
1043939Sabial * modification, are permitted provided that the following conditions
1143939Sabial * are met:
1243939Sabial * 1. Redistributions of source code must retain the above copyright
1343939Sabial *    notice, this list of conditions and the following disclaimer.
1443939Sabial * 2. Redistributions in binary form must reproduce the above copyright
1543939Sabial *    notice, this list of conditions and the following disclaimer in the
1643939Sabial *    documentation and/or other materials provided with the distribution.
1743939Sabial *
1843939Sabial * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
1943939Sabial * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2043939Sabial * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2143939Sabial * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
2243939Sabial * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2343939Sabial * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2443939Sabial * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2543939Sabial * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2643939Sabial * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2743939Sabial * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2843939Sabial * SUCH DAMAGE.
2943939Sabial *
3050479Speter * $FreeBSD: head/release/picobsd/tinyware/simple_httpd/simple_httpd.c 133836 2004-08-16 09:38:34Z dwmalone $
3138589Sabial */
3238589Sabial
3338589Sabial#include <sys/stat.h>
3438589Sabial#include <sys/time.h>
3538589Sabial#include <sys/types.h>
3638589Sabial#include <sys/socket.h>
3746493Sabial#include <sys/wait.h>
3838589Sabial#include <netinet/in.h>
3938589Sabial#include <arpa/inet.h>
4046493Sabial
4146493Sabial#include <fcntl.h>
4238589Sabial#include <netdb.h>
4346493Sabial#include <signal.h>
4446493Sabial#include <stdio.h>
4546493Sabial#include <stdlib.h>
4638589Sabial#include <string.h>
4746493Sabial#include <time.h>
4846493Sabial#include <unistd.h>
4938589Sabial
5046493Sabialint             http_port = 80;
5146493Sabialint             daemonize = 1;
5246493Sabialint             verbose = 0;
5338589Sabialint             http_sock, con_sock;
5446493Sabial
55113126Sdwmaloneconst char     *fetch_mode = NULL;
5646493Sabialchar            homedir[100];
5746493Sabialchar            logfile[80];
58113126Sdwmalonechar           *adate(void);
59113126Sdwmalonevoid            init_servconnection(void);
60113126Sdwmalonevoid		http_date(void);
61113126Sdwmalonevoid            http_output(const char *html);
62113126Sdwmalonevoid            http_request(void);
63113126Sdwmalonevoid            log_line(char *req);
64113126Sdwmalonevoid            wait_connection(void);
6546493Sabial
6638589Sabialstruct hostent *hst;
6746493Sabialstruct sockaddr_in source;
6838589Sabial
6946493Sabial/* HTTP basics */
7046493Sabialstatic char httpd_server_ident[] = "Server: FreeBSD/PicoBSD simple_httpd 1.1\r";
7146493Sabial
7246493Sabialstatic char http_200[] = "HTTP/1.0 200 OK\r";
7346493Sabial
74133836Sdwmaloneconst char *default_mime_type = "application/octet-stream";
75133836Sdwmalone
76133836Sdwmaloneconst char *mime_type[][2] = {
77133836Sdwmalone    { "txt",      "text/plain"            },
78133836Sdwmalone    { "htm",      "text/html"             },
79133836Sdwmalone    { "html",     "text/html"             },
80133836Sdwmalone    { "gif",      "image/gif"             },
81133836Sdwmalone    { "jpg",      "image/jpeg"            },
82133836Sdwmalone    { "mp3",      "audio/mpeg"            }
83133836Sdwmalone};
84133836Sdwmalone
85133836Sdwmaloneconst int mime_type_max = sizeof(mime_type) / sizeof(mime_type[0]) - 1;
86133836Sdwmalone
8746493Sabial/* Two parts, HTTP Header and then HTML */
88113126Sdwmalonestatic const char *http_404[2] =
8946493Sabial    {"HTTP/1.0 404 Not found\r\n",
9046493Sabial"<HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY><H1>Error 404</H1>\
9146493SabialNot found - file doesn't exist or you do not have permission.\n</BODY></HTML>\r\n"
9246493Sabial};
9346493Sabial
94113126Sdwmalonestatic const char *http_405[2] =
9546493Sabial    {"HTTP/1.0 405 Method Not allowed\r\nAllow: GET,HEAD\r\n",
9646493Sabial"<HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY><H1>Error 405</H1>\
9746493SabialThis server only supports GET and HEAD requests.\n</BODY></HTML>\r\n"
9846493Sabial};
9946493Sabial
10046493Sabial/*
10146493Sabial * Only called on initial invocation
10246493Sabial */
10338589Sabialvoid
10438589Sabialinit_servconnection(void)
10538589Sabial{
10638589Sabial	struct sockaddr_in server;
10738589Sabial
10838589Sabial	/* Create a socket */
10938589Sabial	http_sock = socket(AF_INET, SOCK_STREAM, 0);
11038589Sabial	if (http_sock < 0) {
11138589Sabial		perror("socket");
11238589Sabial		exit(1);
11338589Sabial	}
11438589Sabial	server.sin_family = AF_INET;
11538589Sabial	server.sin_port = htons(http_port);
11638589Sabial	server.sin_addr.s_addr = INADDR_ANY;
11738589Sabial	if (bind(http_sock, (struct sockaddr *) & server, sizeof(server)) < 0) {
11838589Sabial		perror("bind socket");
11938589Sabial		exit(1);
12038589Sabial	}
12194130Sasmodai        if (verbose) printf("simple_httpd:%d\n",http_port);
12238589Sabial}
12338589Sabial
12446493Sabial/*
12546493Sabial * Wait here until we see an incoming http request
12646493Sabial */
12794134Sasmodaivoid
12846493Sabialwait_connection(void)
12938589Sabial{
130113126Sdwmalone	socklen_t lg;
13138589Sabial
13238589Sabial	lg = sizeof(struct sockaddr_in);
13338589Sabial
13438589Sabial	con_sock = accept(http_sock, (struct sockaddr *) & source, &lg);
13538589Sabial	if (con_sock <= 0) {
13638589Sabial		perror("accept");
13738589Sabial		exit(1);
13838589Sabial	}
13938589Sabial}
14038589Sabial
14146493Sabial/*
14246493Sabial * Print timestamp for HTTP HEAD and GET
14346493Sabial */
14494134Sasmodaivoid
14594134Sasmodaihttp_date(void)
14638589Sabial{
14738589Sabial	time_t	tl;
14838589Sabial	char	buff[50];
14938589Sabial
15038589Sabial	tl = time(NULL);
15138589Sabial	strftime(buff, 50, "Date: %a, %d %h %Y %H:%M:%S %Z\r\n", gmtime(&tl));
15238589Sabial	write(con_sock, buff, strlen(buff));
153113126Sdwmalone	/* return(buff); */
15438589Sabial}
15538589Sabial
15646493Sabial/*
15746493Sabial * Send data to the open socket
15846493Sabial */
15994134Sasmodaivoid
160113126Sdwmalonehttp_output(const char *html)
16146493Sabial{
16246493Sabial        write(con_sock, html, strlen(html));
16346493Sabial        write(con_sock, "\r\n", 2);
16446493Sabial}
16538589Sabial
16638589Sabial
16746493Sabial/*
16846493Sabial * Create and write the log information to file
16946493Sabial * Log file format is one line per entry
17046493Sabial */
17194134Sasmodaivoid
17246493Sabiallog_line(char *req)
17338589Sabial{
17446493Sabial        char            log_buff[256];
17546493Sabial        char            msg[1024];
17646493Sabial	char            env_host[80], env_addr[80];
17746493Sabial	long            addr;
17846493Sabial	FILE           *log;
17938589Sabial
18046493Sabial	strcpy(log_buff,inet_ntoa(source.sin_addr));
18146493Sabial	sprintf(env_addr, "REMOTE_ADDR=%s",log_buff);
18246493Sabial
18346493Sabial        addr=inet_addr(log_buff);
18446493Sabial
18546493Sabial        strcpy(msg,adate());
18646493Sabial        strcat(msg,"    ");
18746493Sabial        hst=gethostbyaddr((char*) &addr, 4, AF_INET);
18846493Sabial
18946493Sabial	/* If DNS hostname exists */
19046493Sabial        if (hst) {
19146493Sabial	  strcat(msg,hst->h_name);
19246493Sabial	  sprintf(env_host, "REMOTE_HOST=%s",hst->h_name);
19338589Sabial	}
19446493Sabial        strcat(msg," (");
19546493Sabial        strcat(msg,log_buff);
19646493Sabial        strcat(msg,")   ");
19746493Sabial        strcat(msg,req);
19846493Sabial
19946493Sabial	if (daemonize) {
20046493Sabial	  log=fopen(logfile,"a");
20146493Sabial	  fprintf(log,"%s\n",msg);
20246493Sabial	  fclose(log);
20346493Sabial	} else
20446493Sabial	  printf("%s\n",msg);
20546493Sabial
20646493Sabial	/* This is for CGI scripts */
20746493Sabial	putenv(env_addr);
20846493Sabial	putenv(env_host);
20938589Sabial}
21038589Sabial
21146493Sabial/*
21246493Sabial * We have a connection.  Identify what type of request GET, HEAD, CGI, etc
21346493Sabial * and do what needs to be done
21446493Sabial */
21594134Sasmodaivoid
21694135Sasmodaihttp_request(void)
21738589Sabial{
21894132Sasmodai	int             fd, lg, i;
21946493Sabial	int             cmd = 0;
22046493Sabial	char           *p, *par;
221133836Sdwmalone	const char     *filename, *c, *ext, *type;
22246493Sabial	struct stat     file_status;
22338589Sabial	char            req[1024];
22446493Sabial	char            buff[8192];
22538589Sabial
22638589Sabial	lg = read(con_sock, req, 1024);
22738589Sabial
228113126Sdwmalone        if ((p=strstr(req,"\n"))) *p=0;
229113126Sdwmalone        if ((p=strstr(req,"\r"))) *p=0;
23038589Sabial
23146493Sabial	log_line(req);
23238589Sabial
23346493Sabial	c = strtok(req, " ");
23438589Sabial
23546493Sabial	/* Error msg if request is nothing */
23646493Sabial	if (c == NULL) {
23746493Sabial	  http_output(http_404[0]);
23846493Sabial	  http_output(http_404[1]);
23946493Sabial	  goto end_request;
24046493Sabial	}
24138589Sabial
24246493Sabial	if (strncmp(c, "GET", 3) == 0) cmd = 1;
24346493Sabial	if (strncmp(c, "HEAD", 4) == 0) cmd = 2;
24438589Sabial
24546493Sabial	/* Do error msg for any other type of request */
24646493Sabial	if (cmd == 0) {
24746493Sabial	  http_output(http_405[0]);
24846493Sabial	  http_output(http_405[1]);
24946493Sabial	  goto end_request;
25038589Sabial	}
25138589Sabial
25238589Sabial	filename = strtok(NULL, " ");
25338589Sabial
25438589Sabial	c = strtok(NULL, " ");
255113126Sdwmalone	if (fetch_mode != NULL) filename=fetch_mode;
25638589Sabial	if (filename == NULL ||
25738589Sabial            strlen(filename)==1) filename="/index.html";
25838589Sabial
25946493Sabial	while (filename[0]== '/') filename++;
26046493Sabial
26146493Sabial        /* CGI handling.  Untested */
26238589Sabial        if (!strncmp(filename,"cgi-bin/",8))
26338589Sabial           {
26438589Sabial           par=0;
265113126Sdwmalone           if ((par=strstr(filename,"?")))
26638589Sabial              {
26738589Sabial               *par=0;
26838589Sabial                par++;
26938589Sabial              }
27038589Sabial           if (access(filename,X_OK)) goto conti;
27146493Sabial           stat (filename,&file_status);
272112205Sdwmalone           if (setuid(file_status.st_uid)) return;
273112205Sdwmalone           if (seteuid(file_status.st_uid)) return;
27438589Sabial           if (!fork())
27538589Sabial              {
27638589Sabial               close(1);
27738589Sabial               dup(con_sock);
278113126Sdwmalone               /*printf("HTTP/1.0 200 OK\nContent-type: text/html\n\n\n");*/
27946493Sabial	       printf("HTTP/1.0 200 OK\r\n");
28046493Sabial               /* Plug in environment variable, others in log_line */
28146493Sabial	       putenv("SERVER_SOFTWARE=FreeBSD/PicoBSD");
28246493Sabial
28379452Sbrian	       execlp (filename,filename,par,(char *)0);
28438589Sabial              }
28538589Sabial            wait(&i);
286112205Sdwmalone            return;
28738589Sabial            }
28838589Sabial        conti:
28938589Sabial	if (filename == NULL) {
29046493Sabial	  http_output(http_405[0]);
29146493Sabial	  http_output(http_405[1]);
29246493Sabial	  goto end_request;
29338589Sabial	}
29446493Sabial	/* End of CGI handling */
29546493Sabial
29646493Sabial	/* Reject any request with '..' in it, bad hacker */
29738589Sabial	c = filename;
29838589Sabial	while (*c != '\0')
29946493Sabial	  if (c[0] == '.' && c[1] == '.') {
30046493Sabial	    http_output(http_404[0]);
30146493Sabial	    http_output(http_404[1]);
30246493Sabial	    goto end_request;
30346493Sabial	  } else
30446493Sabial	    c++;
30546493Sabial
30646493Sabial	/* Open filename */
30738589Sabial	fd = open(filename, O_RDONLY);
30838589Sabial	if (fd < 0) {
30946493Sabial	        http_output(http_404[0]);
31046493Sabial	        http_output(http_404[1]);
31146493Sabial		goto end_request;
31238589Sabial	}
31346493Sabial
31446493Sabial	/* Get file status information */
31546493Sabial	if (fstat(fd, &file_status) < 0) {
31646493Sabial	  http_output(http_404[0]);
31746493Sabial	  http_output(http_404[1]);
318113126Sdwmalone	  goto end_request2;
31938589Sabial	}
32046493Sabial
32146493Sabial	/* Is it a regular file? */
32246493Sabial	if (!S_ISREG(file_status.st_mode)) {
32346493Sabial	  http_output(http_404[0]);
32446493Sabial	  http_output(http_404[1]);
325113126Sdwmalone	  goto end_request2;
32646493Sabial	}
32738589Sabial
32846493Sabial	/* Past this point we are serving either a GET or HEAD */
32946493Sabial	/* Print all the header info */
33046493Sabial	http_output(http_200);
33146493Sabial	http_output(httpd_server_ident);
33246493Sabial	http_date();
33338589Sabial
33494133Sasmodai	sprintf(buff, "Content-length: %lld\r\n", file_status.st_size);
335113129Sdwmalone	write(con_sock, buff, strlen(buff));
33638589Sabial
337133836Sdwmalone	strcpy(buff, "Content-type: ");
338133836Sdwmalone	type = default_mime_type;
339133836Sdwmalone	if ((ext = strrchr(filename, '.')) != NULL) {
340133836Sdwmalone	  for (i = mime_type_max; i >= 0; i--)
341133836Sdwmalone	    if (strcmp(ext + 1, mime_type[i][0]) == 0) {
342133836Sdwmalone	      type = mime_type[i][1];
343133836Sdwmalone	      break;
344133836Sdwmalone	    }
34546493Sabial	}
346133836Sdwmalone	strcat(buff, type);
347133836Sdwmalone	http_output(buff);
34846493Sabial
34946493Sabial	strftime(buff, 50, "Last-Modified: %a, %d %h %Y %H:%M:%S %Z\r\n\r\n", gmtime(&file_status.st_mtime));
35046493Sabial	write(con_sock, buff, strlen(buff));
35138589Sabial
35246493Sabial	/* Send data only if GET request */
35338589Sabial	if (cmd == 1) {
354113126Sdwmalone	  while ((lg = read(fd, buff, 8192)) > 0)
35546493Sabial	    write(con_sock, buff, lg);
35638589Sabial	}
35738589Sabial
358113126Sdwmaloneend_request2:
359113126Sdwmalone	close(fd);
36046493Sabialend_request:
36138589Sabial	close(con_sock);
36238589Sabial
36338589Sabial}
36438589Sabial
36546493Sabial/*
36646493Sabial * Simple httpd server for use in PicoBSD or other embedded application.
36746493Sabial * Should satisfy simple httpd needs.  For more demanding situations
36846493Sabial * apache is probably a better (but much larger) choice.
36946493Sabial */
37094134Sasmodaiint
37146493Sabialmain(int argc, char *argv[])
37238589Sabial{
37394132Sasmodai        int ch, ld;
37446493Sabial	int             httpd_group = 65534;
37546493Sabial        pid_t server_pid;
37646493Sabial
37746493Sabial	/* Default for html directory */
37838589Sabial	strcpy (homedir,getenv("HOME"));
37938589Sabial        if (!geteuid()) strcpy (homedir,"/httphome");
38038589Sabial           else         strcat (homedir,"/httphome");
38138589Sabial
38246493Sabial	/* Defaults for log file */
38346493Sabial	if (geteuid()) {
38446493Sabial	    strcpy(logfile,getenv("HOME"));
38546493Sabial	    strcat(logfile,"/");
38646493Sabial	    strcat(logfile,"jhttp.log");
38746493Sabial	} else
38846493Sabial	  strcpy(logfile,"/var/log/jhttpd.log");
38938589Sabial
39046493Sabial	/* Parse command line arguments */
39146493Sabial	while ((ch = getopt(argc, argv, "d:f:g:l:p:vDh")) != -1)
39246493Sabial	  switch (ch) {
39346493Sabial	  case 'd':
39446493Sabial	    strcpy(homedir,optarg);
39546493Sabial	    break;
39646493Sabial	  case 'f':
39746493Sabial	    daemonize = 0;
39846493Sabial	    verbose = 1;
399113126Sdwmalone	    fetch_mode = optarg;
40046493Sabial	    break;
40146493Sabial	  case 'g':
40246493Sabial	    httpd_group = atoi(optarg);
40346493Sabial	    break;
40446493Sabial	  case 'l':
40546493Sabial	    strcpy(logfile,optarg);
40646493Sabial	    break;
40746493Sabial	  case 'p':
40846493Sabial	    http_port = atoi(optarg);
40946493Sabial	    break;
41046493Sabial	  case 'v':
41146493Sabial	    verbose = 1;
41246493Sabial	    break;
41346493Sabial	  case 'D':
41446493Sabial	    daemonize = 0;
41546493Sabial	    break;
41646493Sabial	  case '?':
41746493Sabial	  case 'h':
41846493Sabial	  default:
41946493Sabial	    printf("usage: simple_httpd [[-d directory][-g grpid][-l logfile][-p port][-vD]]\n");
42046493Sabial	    exit(1);
42146493Sabial	    /* NOTREACHED */
42246493Sabial	  }
42346493Sabial
42446493Sabial	/* Not running as root and no port supplied, assume 1080 */
42546493Sabial        if ((http_port == 80) && geteuid()) {
42646493Sabial	  http_port = 1080;
42746493Sabial	}
42846493Sabial
42946493Sabial	/* Do we really have rights in the html directory? */
430113126Sdwmalone	if (fetch_mode == NULL) {
43146493Sabial	  if (chdir(homedir)) {
43246493Sabial	    perror("chdir");
43346493Sabial	    puts(homedir);
43446493Sabial	    exit(1);
43546493Sabial	  }
43646493Sabial	}
43746493Sabial
43846493Sabial	/* Create log file if it doesn't exit */
43946493Sabial	if ((access(logfile,W_OK)) && daemonize) {
44046493Sabial	  ld = open (logfile,O_WRONLY);
44146493Sabial	  chmod (logfile,00600);
44246493Sabial	  close(ld);
44346493Sabial	}
44446493Sabial
44538589Sabial        init_servconnection();
44638589Sabial
44746493Sabial        if (verbose) {
44846493Sabial	  printf("Server started with options \n");
44946493Sabial	  printf("port: %d\n",http_port);
450113126Sdwmalone	  if (fetch_mode == NULL) printf("html home: %s\n",homedir);
45146493Sabial	  if (daemonize) printf("logfile: %s\n",logfile);
45246493Sabial	}
45338589Sabial
45446493Sabial	/* httpd is spawned */
45546493Sabial        if (daemonize) {
456113126Sdwmalone	  if ((server_pid = fork()) != 0) {
45746493Sabial	    wait3(0,WNOHANG,0);
45846493Sabial	    if (verbose) printf("pid: %d\n",server_pid);
45946493Sabial	    exit(0);
46046493Sabial	  }
46146493Sabial	  wait3(0,WNOHANG,0);
46246493Sabial	}
46338589Sabial
464113126Sdwmalone	if (fetch_mode == NULL) setpgrp(0,httpd_group);
46546493Sabial
46646493Sabial	/* How many connections do you want?
46746493Sabial	 * Keep this lower than the available number of processes
46846493Sabial	 */
46946493Sabial        if (listen(http_sock,15) < 0) exit(1);
47046493Sabial
47138589Sabial        label:
47246493Sabial	wait_connection();
47346493Sabial
47446493Sabial	if (fork()) {
47546493Sabial	  wait3(0,WNOHANG,0);
47646493Sabial	  close(con_sock);
47746493Sabial	  goto label;
47846493Sabial	}
47946493Sabial
48046493Sabial	http_request();
48146493Sabial
48246493Sabial	wait3(0,WNOHANG,0);
48346493Sabial	exit(0);
48438589Sabial}
48538589Sabial
48638589Sabial
487113126Sdwmalonechar *
488113126Sdwmaloneadate(void)
48938589Sabial{
49038589Sabial        static char out[50];
491112205Sdwmalone        time_t now;
49238589Sabial        struct tm *t;
49338589Sabial        time(&now);
49438589Sabial        t = localtime(&now);
49543939Sabial        sprintf(out, "%02d:%02d:%02d %02d/%02d/%02d",
49643939Sabial                     t->tm_hour, t->tm_min, t->tm_sec,
49743939Sabial                     t->tm_mday, t->tm_mon+1, t->tm_year );
49838589Sabial        return out;
49938589Sabial}
500