simple_httpd.c revision 94135 
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 94135 2002-04-07 17:42:27Z asmodai $
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
5546493Sabialchar            fetch_mode[100];
5646493Sabialchar            homedir[100];
5746493Sabialchar            logfile[80];
5838589Sabialchar           *adate();
5946493Sabial
6038589Sabialstruct hostent *hst;
6146493Sabialstruct sockaddr_in source;
6238589Sabial
6346493Sabial/* HTTP basics */
6446493Sabialstatic char httpd_server_ident[] = "Server: FreeBSD/PicoBSD simple_httpd 1.1\r";
6546493Sabial
6646493Sabialstatic char http_200[] = "HTTP/1.0 200 OK\r";
6746493Sabial
6846493Sabial/* Two parts, HTTP Header and then HTML */
6946493Sabialstatic char *http_404[2] =
7046493Sabial    {"HTTP/1.0 404 Not found\r\n",
7146493Sabial"<HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY><H1>Error 404</H1>\
7246493SabialNot found - file doesn't exist or you do not have permission.\n</BODY></HTML>\r\n"
7346493Sabial};
7446493Sabial
7546493Sabialstatic char *http_405[2] =
7646493Sabial    {"HTTP/1.0 405 Method Not allowed\r\nAllow: GET,HEAD\r\n",
7746493Sabial"<HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY><H1>Error 405</H1>\
7846493SabialThis server only supports GET and HEAD requests.\n</BODY></HTML>\r\n"
7946493Sabial};
8046493Sabial
8146493Sabial/*
8246493Sabial * Only called on initial invocation
8346493Sabial */
8438589Sabialvoid
8538589Sabialinit_servconnection(void)
8638589Sabial{
8738589Sabial	struct sockaddr_in server;
8838589Sabial
8938589Sabial	/* Create a socket */
9038589Sabial	http_sock = socket(AF_INET, SOCK_STREAM, 0);
9138589Sabial	if (http_sock < 0) {
9238589Sabial		perror("socket");
9338589Sabial		exit(1);
9438589Sabial	}
9538589Sabial	server.sin_family = AF_INET;
9638589Sabial	server.sin_port = htons(http_port);
9738589Sabial	server.sin_addr.s_addr = INADDR_ANY;
9838589Sabial	if (bind(http_sock, (struct sockaddr *) & server, sizeof(server)) < 0) {
9938589Sabial		perror("bind socket");
10038589Sabial		exit(1);
10138589Sabial	}
10294130Sasmodai        if (verbose) printf("simple_httpd:%d\n",http_port);
10338589Sabial}
10438589Sabial
10546493Sabial/*
10646493Sabial * Wait here until we see an incoming http request
10746493Sabial */
10894134Sasmodaivoid
10946493Sabialwait_connection(void)
11038589Sabial{
11138589Sabial	int lg;
11238589Sabial
11338589Sabial	lg = sizeof(struct sockaddr_in);
11438589Sabial
11538589Sabial	con_sock = accept(http_sock, (struct sockaddr *) & source, &lg);
11638589Sabial	if (con_sock <= 0) {
11738589Sabial		perror("accept");
11838589Sabial		exit(1);
11938589Sabial	}
12038589Sabial}
12138589Sabial
12246493Sabial/*
12346493Sabial * Print timestamp for HTTP HEAD and GET
12446493Sabial */
12594134Sasmodaivoid
12694134Sasmodaihttp_date(void)
12738589Sabial{
12838589Sabial	time_t	tl;
12938589Sabial	char	buff[50];
13038589Sabial
13138589Sabial	tl = time(NULL);
13238589Sabial	strftime(buff, 50, "Date: %a, %d %h %Y %H:%M:%S %Z\r\n", gmtime(&tl));
13338589Sabial	write(con_sock, buff, strlen(buff));
13446493Sabial	//return(buff);
13538589Sabial}
13638589Sabial
13746493Sabial/*
13846493Sabial * Send data to the open socket
13946493Sabial */
14094134Sasmodaivoid
14146493Sabialhttp_output(char *html)
14246493Sabial{
14346493Sabial        write(con_sock, html, strlen(html));
14446493Sabial        write(con_sock, "\r\n", 2);
14546493Sabial}
14638589Sabial
14738589Sabial
14846493Sabial/*
14946493Sabial * Create and write the log information to file
15046493Sabial * Log file format is one line per entry
15146493Sabial */
15294134Sasmodaivoid
15346493Sabiallog_line(char *req)
15438589Sabial{
15546493Sabial        char            log_buff[256];
15646493Sabial        char            msg[1024];
15746493Sabial	char            env_host[80], env_addr[80];
15846493Sabial	long            addr;
15946493Sabial	FILE           *log;
16038589Sabial
16146493Sabial	strcpy(log_buff,inet_ntoa(source.sin_addr));
16246493Sabial	sprintf(env_addr, "REMOTE_ADDR=%s",log_buff);
16346493Sabial
16446493Sabial        addr=inet_addr(log_buff);
16546493Sabial
16646493Sabial        strcpy(msg,adate());
16746493Sabial        strcat(msg,"    ");
16846493Sabial        hst=gethostbyaddr((char*) &addr, 4, AF_INET);
16946493Sabial
17046493Sabial	/* If DNS hostname exists */
17146493Sabial        if (hst) {
17246493Sabial	  strcat(msg,hst->h_name);
17346493Sabial	  sprintf(env_host, "REMOTE_HOST=%s",hst->h_name);
17438589Sabial	}
17546493Sabial        strcat(msg," (");
17646493Sabial        strcat(msg,log_buff);
17746493Sabial        strcat(msg,")   ");
17846493Sabial        strcat(msg,req);
17946493Sabial
18046493Sabial	if (daemonize) {
18146493Sabial	  log=fopen(logfile,"a");
18246493Sabial	  fprintf(log,"%s\n",msg);
18346493Sabial	  fclose(log);
18446493Sabial	} else
18546493Sabial	  printf("%s\n",msg);
18646493Sabial
18746493Sabial	/* This is for CGI scripts */
18846493Sabial	putenv(env_addr);
18946493Sabial	putenv(env_host);
19038589Sabial}
19138589Sabial
19246493Sabial/*
19346493Sabial * We have a connection.  Identify what type of request GET, HEAD, CGI, etc
19446493Sabial * and do what needs to be done
19546493Sabial */
19694134Sasmodaivoid
19794135Sasmodaihttp_request(void)
19838589Sabial{
19994132Sasmodai	int             fd, lg, i;
20046493Sabial	int             cmd = 0;
20146493Sabial	char           *p, *par;
20238589Sabial	char           *filename, *c;
20346493Sabial	struct stat     file_status;
20438589Sabial	char            req[1024];
20546493Sabial	char            buff[8192];
20638589Sabial
20738589Sabial	lg = read(con_sock, req, 1024);
20838589Sabial
20938589Sabial        if (p=strstr(req,"\n")) *p=0;
21038589Sabial        if (p=strstr(req,"\r")) *p=0;
21138589Sabial
21246493Sabial	log_line(req);
21338589Sabial
21446493Sabial	c = strtok(req, " ");
21538589Sabial
21646493Sabial	/* Error msg if request is nothing */
21746493Sabial	if (c == NULL) {
21846493Sabial	  http_output(http_404[0]);
21946493Sabial	  http_output(http_404[1]);
22046493Sabial	  goto end_request;
22146493Sabial	}
22238589Sabial
22346493Sabial	if (strncmp(c, "GET", 3) == 0) cmd = 1;
22446493Sabial	if (strncmp(c, "HEAD", 4) == 0) cmd = 2;
22538589Sabial
22646493Sabial	/* Do error msg for any other type of request */
22746493Sabial	if (cmd == 0) {
22846493Sabial	  http_output(http_405[0]);
22946493Sabial	  http_output(http_405[1]);
23046493Sabial	  goto end_request;
23138589Sabial	}
23238589Sabial
23338589Sabial	filename = strtok(NULL, " ");
23438589Sabial
23538589Sabial	c = strtok(NULL, " ");
23646493Sabial	if (fetch_mode[0] != NULL) strcpy(filename,fetch_mode);
23738589Sabial	if (filename == NULL ||
23838589Sabial            strlen(filename)==1) filename="/index.html";
23938589Sabial
24046493Sabial	while (filename[0]== '/') filename++;
24146493Sabial
24246493Sabial        /* CGI handling.  Untested */
24338589Sabial        if (!strncmp(filename,"cgi-bin/",8))
24438589Sabial           {
24538589Sabial           par=0;
24638589Sabial           if (par=strstr(filename,"?"))
24738589Sabial              {
24838589Sabial               *par=0;
24938589Sabial                par++;
25038589Sabial              }
25138589Sabial           if (access(filename,X_OK)) goto conti;
25246493Sabial           stat (filename,&file_status);
25346493Sabial           if (setuid(file_status.st_uid)) return(0);
25446493Sabial           if (seteuid(file_status.st_uid)) return(0);
25538589Sabial           if (!fork())
25638589Sabial              {
25738589Sabial               close(1);
25838589Sabial               dup(con_sock);
25946493Sabial               //printf("HTTP/1.0 200 OK\nContent-type: text/html\n\n\n");
26046493Sabial	       printf("HTTP/1.0 200 OK\r\n");
26146493Sabial               /* Plug in environment variable, others in log_line */
26246493Sabial	       putenv("SERVER_SOFTWARE=FreeBSD/PicoBSD");
26346493Sabial
26479452Sbrian	       execlp (filename,filename,par,(char *)0);
26538589Sabial              }
26638589Sabial            wait(&i);
26738589Sabial            return(0);
26838589Sabial            }
26938589Sabial        conti:
27038589Sabial	if (filename == NULL) {
27146493Sabial	  http_output(http_405[0]);
27246493Sabial	  http_output(http_405[1]);
27346493Sabial	  goto end_request;
27438589Sabial	}
27546493Sabial	/* End of CGI handling */
27646493Sabial
27746493Sabial	/* Reject any request with '..' in it, bad hacker */
27838589Sabial	c = filename;
27938589Sabial	while (*c != '\0')
28046493Sabial	  if (c[0] == '.' && c[1] == '.') {
28146493Sabial	    http_output(http_404[0]);
28246493Sabial	    http_output(http_404[1]);
28346493Sabial	    goto end_request;
28446493Sabial	  } else
28546493Sabial	    c++;
28646493Sabial
28746493Sabial	/* Open filename */
28838589Sabial	fd = open(filename, O_RDONLY);
28938589Sabial	if (fd < 0) {
29046493Sabial	        http_output(http_404[0]);
29146493Sabial	        http_output(http_404[1]);
29246493Sabial		goto end_request;
29338589Sabial	}
29446493Sabial
29546493Sabial	/* Get file status information */
29646493Sabial	if (fstat(fd, &file_status) < 0) {
29746493Sabial	  http_output(http_404[0]);
29846493Sabial	  http_output(http_404[1]);
29946493Sabial	  goto end_request;
30038589Sabial	}
30146493Sabial
30246493Sabial	/* Is it a regular file? */
30346493Sabial	if (!S_ISREG(file_status.st_mode)) {
30446493Sabial	  http_output(http_404[0]);
30546493Sabial	  http_output(http_404[1]);
30646493Sabial	  goto end_request;
30746493Sabial	}
30838589Sabial
30946493Sabial	/* Past this point we are serving either a GET or HEAD */
31046493Sabial	/* Print all the header info */
31146493Sabial	http_output(http_200);
31246493Sabial	http_output(httpd_server_ident);
31346493Sabial	http_date();
31438589Sabial
31594133Sasmodai	sprintf(buff, "Content-length: %lld\r\n", file_status.st_size);
31638589Sabial
31746493Sabial	if (strstr(filename,".txt")) {
31846493Sabial	  strcpy(buff,"Content-type: text/plain\r\n");
31946493Sabial	} else if (strstr(filename,".html") || strstr(filename,".htm")) {
32046493Sabial	    strcpy(buff,"Content-type: text/html\r\n");
32146493Sabial	} else if (strstr(filename,".gif")) {
32246493Sabial	  strcpy(buff,"Content-type: image/gif\r\n");
32346493Sabial	} else if (strstr(filename,".jpg")) {
32446493Sabial	  strcpy(buff,"Content-type: image/jpeg\r\n");
32546493Sabial	} else {
32646493Sabial	  /* Take a guess at content if we don't have something already */
32746493Sabial	  strcpy(buff,"Content-type: ");
32846493Sabial	  strcat(buff,strstr(filename,".")+1);
32946493Sabial	  strcat(buff,"\r\n");
33046493Sabial	}
33146493Sabial	write(con_sock, buff, strlen(buff));
33246493Sabial
33346493Sabial	strftime(buff, 50, "Last-Modified: %a, %d %h %Y %H:%M:%S %Z\r\n\r\n", gmtime(&file_status.st_mtime));
33446493Sabial	write(con_sock, buff, strlen(buff));
33538589Sabial
33646493Sabial	/* Send data only if GET request */
33738589Sabial	if (cmd == 1) {
33846493Sabial	  while (lg = read(fd, buff, 8192))
33946493Sabial	    write(con_sock, buff, lg);
34038589Sabial	}
34138589Sabial
34246493Sabialend_request:
34338589Sabial	close(fd);
34438589Sabial	close(con_sock);
34538589Sabial
34638589Sabial}
34738589Sabial
34846493Sabial/*
34946493Sabial * Simple httpd server for use in PicoBSD or other embedded application.
35046493Sabial * Should satisfy simple httpd needs.  For more demanding situations
35146493Sabial * apache is probably a better (but much larger) choice.
35246493Sabial */
35394134Sasmodaiint
35446493Sabialmain(int argc, char *argv[])
35538589Sabial{
35646493Sabial        extern char *optarg;
35746493Sabial        extern int optind;
35894132Sasmodai        int ch, ld;
35946493Sabial	int             httpd_group = 65534;
36046493Sabial        pid_t server_pid;
36146493Sabial
36246493Sabial	/* Default for html directory */
36338589Sabial	strcpy (homedir,getenv("HOME"));
36438589Sabial        if (!geteuid()) strcpy (homedir,"/httphome");
36538589Sabial           else         strcat (homedir,"/httphome");
36638589Sabial
36746493Sabial	/* Defaults for log file */
36846493Sabial	if (geteuid()) {
36946493Sabial	    strcpy(logfile,getenv("HOME"));
37046493Sabial	    strcat(logfile,"/");
37146493Sabial	    strcat(logfile,"jhttp.log");
37246493Sabial	} else
37346493Sabial	  strcpy(logfile,"/var/log/jhttpd.log");
37438589Sabial
37546493Sabial	/* Parse command line arguments */
37646493Sabial	while ((ch = getopt(argc, argv, "d:f:g:l:p:vDh")) != -1)
37746493Sabial	  switch (ch) {
37846493Sabial	  case 'd':
37946493Sabial	    strcpy(homedir,optarg);
38046493Sabial	    break;
38146493Sabial	  case 'f':
38246493Sabial	    daemonize = 0;
38346493Sabial	    verbose = 1;
38446493Sabial	    strcpy(fetch_mode,optarg);
38546493Sabial	    break;
38646493Sabial	  case 'g':
38746493Sabial	    httpd_group = atoi(optarg);
38846493Sabial	    break;
38946493Sabial	  case 'l':
39046493Sabial	    strcpy(logfile,optarg);
39146493Sabial	    break;
39246493Sabial	  case 'p':
39346493Sabial	    http_port = atoi(optarg);
39446493Sabial	    break;
39546493Sabial	  case 'v':
39646493Sabial	    verbose = 1;
39746493Sabial	    break;
39846493Sabial	  case 'D':
39946493Sabial	    daemonize = 0;
40046493Sabial	    break;
40146493Sabial	  case '?':
40246493Sabial	  case 'h':
40346493Sabial	  default:
40446493Sabial	    printf("usage: simple_httpd [[-d directory][-g grpid][-l logfile][-p port][-vD]]\n");
40546493Sabial	    exit(1);
40646493Sabial	    /* NOTREACHED */
40746493Sabial	  }
40846493Sabial
40946493Sabial	/* Not running as root and no port supplied, assume 1080 */
41046493Sabial        if ((http_port == 80) && geteuid()) {
41146493Sabial	  http_port = 1080;
41246493Sabial	}
41346493Sabial
41446493Sabial	/* Do we really have rights in the html directory? */
41546493Sabial	if (fetch_mode[0] == NULL) {
41646493Sabial	  if (chdir(homedir)) {
41746493Sabial	    perror("chdir");
41846493Sabial	    puts(homedir);
41946493Sabial	    exit(1);
42046493Sabial	  }
42146493Sabial	}
42246493Sabial
42346493Sabial	/* Create log file if it doesn't exit */
42446493Sabial	if ((access(logfile,W_OK)) && daemonize) {
42546493Sabial	  ld = open (logfile,O_WRONLY);
42646493Sabial	  chmod (logfile,00600);
42746493Sabial	  close(ld);
42846493Sabial	}
42946493Sabial
43038589Sabial        init_servconnection();
43138589Sabial
43246493Sabial        if (verbose) {
43346493Sabial	  printf("Server started with options \n");
43446493Sabial	  printf("port: %d\n",http_port);
43546493Sabial	  if (fetch_mode[0] == NULL) printf("html home: %s\n",homedir);
43646493Sabial	  if (daemonize) printf("logfile: %s\n",logfile);
43746493Sabial	}
43838589Sabial
43946493Sabial	/* httpd is spawned */
44046493Sabial        if (daemonize) {
44146493Sabial	  if (server_pid = fork()) {
44246493Sabial	    wait3(0,WNOHANG,0);
44346493Sabial	    if (verbose) printf("pid: %d\n",server_pid);
44446493Sabial	    exit(0);
44546493Sabial	  }
44646493Sabial	  wait3(0,WNOHANG,0);
44746493Sabial	}
44838589Sabial
44946493Sabial	if (fetch_mode[0] == NULL) setpgrp(0,httpd_group);
45046493Sabial
45146493Sabial	/* How many connections do you want?
45246493Sabial	 * Keep this lower than the available number of processes
45346493Sabial	 */
45446493Sabial        if (listen(http_sock,15) < 0) exit(1);
45546493Sabial
45638589Sabial        label:
45746493Sabial	wait_connection();
45846493Sabial
45946493Sabial	if (fork()) {
46046493Sabial	  wait3(0,WNOHANG,0);
46146493Sabial	  close(con_sock);
46246493Sabial	  goto label;
46346493Sabial	}
46446493Sabial
46546493Sabial	http_request();
46646493Sabial
46746493Sabial	wait3(0,WNOHANG,0);
46846493Sabial	exit(0);
46938589Sabial}
47038589Sabial
47138589Sabial
47238589Sabialchar *adate()
47338589Sabial{
47438589Sabial        static char out[50];
47538589Sabial        long now;
47638589Sabial        struct tm *t;
47738589Sabial        time(&now);
47838589Sabial        t = localtime(&now);
47943939Sabial        sprintf(out, "%02d:%02d:%02d %02d/%02d/%02d",
48043939Sabial                     t->tm_hour, t->tm_min, t->tm_sec,
48143939Sabial                     t->tm_mday, t->tm_mon+1, t->tm_year );
48238589Sabial        return out;
48338589Sabial}
484