simple_httpd.c revision 79452
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 79452 2001-07-09 09:24:06Z brian $ 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 } 10246493Sabial if (verbose) printf("simple_httpd\n",http_port); 10338589Sabial} 10438589Sabial 10546493Sabial/* 10646493Sabial * Wait here until we see an incoming http request 10746493Sabial */ 10846493Sabialwait_connection(void) 10938589Sabial{ 11038589Sabial int lg; 11138589Sabial 11238589Sabial lg = sizeof(struct sockaddr_in); 11338589Sabial 11438589Sabial con_sock = accept(http_sock, (struct sockaddr *) & source, &lg); 11538589Sabial if (con_sock <= 0) { 11638589Sabial perror("accept"); 11738589Sabial exit(1); 11838589Sabial } 11938589Sabial} 12038589Sabial 12146493Sabial/* 12246493Sabial * Print timestamp for HTTP HEAD and GET 12346493Sabial */ 12446493Sabialhttp_date() 12538589Sabial{ 12638589Sabial time_t tl; 12738589Sabial char buff[50]; 12838589Sabial 12938589Sabial tl = time(NULL); 13038589Sabial strftime(buff, 50, "Date: %a, %d %h %Y %H:%M:%S %Z\r\n", gmtime(&tl)); 13138589Sabial write(con_sock, buff, strlen(buff)); 13246493Sabial //return(buff); 13338589Sabial} 13438589Sabial 13546493Sabial/* 13646493Sabial * Send data to the open socket 13746493Sabial */ 13846493Sabialhttp_output(char *html) 13946493Sabial{ 14046493Sabial write(con_sock, html, strlen(html)); 14146493Sabial write(con_sock, "\r\n", 2); 14246493Sabial} 14338589Sabial 14438589Sabial 14546493Sabial/* 14646493Sabial * Create and write the log information to file 14746493Sabial * Log file format is one line per entry 14846493Sabial */ 14946493Sabiallog_line(char *req) 15038589Sabial{ 15146493Sabial char log_buff[256]; 15246493Sabial char msg[1024]; 15346493Sabial char env_host[80], env_addr[80]; 15446493Sabial long addr; 15546493Sabial FILE *log; 15638589Sabial 15746493Sabial strcpy(log_buff,inet_ntoa(source.sin_addr)); 15846493Sabial sprintf(env_addr, "REMOTE_ADDR=%s",log_buff); 15946493Sabial 16046493Sabial addr=inet_addr(log_buff); 16146493Sabial 16246493Sabial strcpy(msg,adate()); 16346493Sabial strcat(msg," "); 16446493Sabial hst=gethostbyaddr((char*) &addr, 4, AF_INET); 16546493Sabial 16646493Sabial /* If DNS hostname exists */ 16746493Sabial if (hst) { 16846493Sabial strcat(msg,hst->h_name); 16946493Sabial sprintf(env_host, "REMOTE_HOST=%s",hst->h_name); 17038589Sabial } 17146493Sabial strcat(msg," ("); 17246493Sabial strcat(msg,log_buff); 17346493Sabial strcat(msg,") "); 17446493Sabial strcat(msg,req); 17546493Sabial 17646493Sabial if (daemonize) { 17746493Sabial log=fopen(logfile,"a"); 17846493Sabial fprintf(log,"%s\n",msg); 17946493Sabial fclose(log); 18046493Sabial } else 18146493Sabial printf("%s\n",msg); 18246493Sabial 18346493Sabial /* This is for CGI scripts */ 18446493Sabial putenv(env_addr); 18546493Sabial putenv(env_host); 18638589Sabial} 18738589Sabial 18846493Sabial/* 18946493Sabial * We have a connection. Identify what type of request GET, HEAD, CGI, etc 19046493Sabial * and do what needs to be done 19146493Sabial */ 19246493Sabialhttp_request() 19338589Sabial{ 19446493Sabial int fd, lg, ld, i; 19546493Sabial int cmd = 0; 19646493Sabial int http1 = 0; 19746493Sabial char *p, *par; 19838589Sabial char *filename, *c; 19946493Sabial struct stat file_status; 20038589Sabial char req[1024]; 20138589Sabial char msg[1024]; 20246493Sabial char buff[8192]; 20338589Sabial 20438589Sabial lg = read(con_sock, req, 1024); 20538589Sabial 20638589Sabial if (p=strstr(req,"\n")) *p=0; 20738589Sabial if (p=strstr(req,"\r")) *p=0; 20838589Sabial 20946493Sabial log_line(req); 21038589Sabial 21146493Sabial c = strtok(req, " "); 21238589Sabial 21346493Sabial /* Error msg if request is nothing */ 21446493Sabial if (c == NULL) { 21546493Sabial http_output(http_404[0]); 21646493Sabial http_output(http_404[1]); 21746493Sabial goto end_request; 21846493Sabial } 21938589Sabial 22046493Sabial if (strncmp(c, "GET", 3) == 0) cmd = 1; 22146493Sabial if (strncmp(c, "HEAD", 4) == 0) cmd = 2; 22238589Sabial 22346493Sabial /* Do error msg for any other type of request */ 22446493Sabial if (cmd == 0) { 22546493Sabial http_output(http_405[0]); 22646493Sabial http_output(http_405[1]); 22746493Sabial goto end_request; 22838589Sabial } 22938589Sabial 23038589Sabial filename = strtok(NULL, " "); 23138589Sabial 23238589Sabial c = strtok(NULL, " "); 23346493Sabial if (fetch_mode[0] != NULL) strcpy(filename,fetch_mode); 23438589Sabial if (filename == NULL || 23538589Sabial strlen(filename)==1) filename="/index.html"; 23638589Sabial 23746493Sabial while (filename[0]== '/') filename++; 23846493Sabial 23946493Sabial /* CGI handling. Untested */ 24038589Sabial if (!strncmp(filename,"cgi-bin/",8)) 24138589Sabial { 24238589Sabial par=0; 24338589Sabial if (par=strstr(filename,"?")) 24438589Sabial { 24538589Sabial *par=0; 24638589Sabial par++; 24738589Sabial } 24838589Sabial if (access(filename,X_OK)) goto conti; 24946493Sabial stat (filename,&file_status); 25046493Sabial if (setuid(file_status.st_uid)) return(0); 25146493Sabial if (seteuid(file_status.st_uid)) return(0); 25238589Sabial if (!fork()) 25338589Sabial { 25438589Sabial close(1); 25538589Sabial dup(con_sock); 25646493Sabial //printf("HTTP/1.0 200 OK\nContent-type: text/html\n\n\n"); 25746493Sabial printf("HTTP/1.0 200 OK\r\n"); 25846493Sabial /* Plug in environment variable, others in log_line */ 25946493Sabial putenv("SERVER_SOFTWARE=FreeBSD/PicoBSD"); 26046493Sabial 26179452Sbrian execlp (filename,filename,par,(char *)0); 26238589Sabial } 26338589Sabial wait(&i); 26438589Sabial return(0); 26538589Sabial } 26638589Sabial conti: 26738589Sabial if (filename == NULL) { 26846493Sabial http_output(http_405[0]); 26946493Sabial http_output(http_405[1]); 27046493Sabial goto end_request; 27138589Sabial } 27246493Sabial /* End of CGI handling */ 27346493Sabial 27446493Sabial /* Reject any request with '..' in it, bad hacker */ 27538589Sabial c = filename; 27638589Sabial while (*c != '\0') 27746493Sabial if (c[0] == '.' && c[1] == '.') { 27846493Sabial http_output(http_404[0]); 27946493Sabial http_output(http_404[1]); 28046493Sabial goto end_request; 28146493Sabial } else 28246493Sabial c++; 28346493Sabial 28446493Sabial /* Open filename */ 28538589Sabial fd = open(filename, O_RDONLY); 28638589Sabial if (fd < 0) { 28746493Sabial http_output(http_404[0]); 28846493Sabial http_output(http_404[1]); 28946493Sabial goto end_request; 29038589Sabial } 29146493Sabial 29246493Sabial /* Get file status information */ 29346493Sabial if (fstat(fd, &file_status) < 0) { 29446493Sabial http_output(http_404[0]); 29546493Sabial http_output(http_404[1]); 29646493Sabial goto end_request; 29738589Sabial } 29846493Sabial 29946493Sabial /* Is it a regular file? */ 30046493Sabial if (!S_ISREG(file_status.st_mode)) { 30146493Sabial http_output(http_404[0]); 30246493Sabial http_output(http_404[1]); 30346493Sabial goto end_request; 30446493Sabial } 30538589Sabial 30646493Sabial /* Past this point we are serving either a GET or HEAD */ 30746493Sabial /* Print all the header info */ 30846493Sabial http_output(http_200); 30946493Sabial http_output(httpd_server_ident); 31046493Sabial http_date(); 31138589Sabial 31246493Sabial sprintf(buff, "Content-length: %d\r\n", file_status.st_size); 31338589Sabial 31446493Sabial if (strstr(filename,".txt")) { 31546493Sabial strcpy(buff,"Content-type: text/plain\r\n"); 31646493Sabial } else if (strstr(filename,".html") || strstr(filename,".htm")) { 31746493Sabial strcpy(buff,"Content-type: text/html\r\n"); 31846493Sabial } else if (strstr(filename,".gif")) { 31946493Sabial strcpy(buff,"Content-type: image/gif\r\n"); 32046493Sabial } else if (strstr(filename,".jpg")) { 32146493Sabial strcpy(buff,"Content-type: image/jpeg\r\n"); 32246493Sabial } else { 32346493Sabial /* Take a guess at content if we don't have something already */ 32446493Sabial strcpy(buff,"Content-type: "); 32546493Sabial strcat(buff,strstr(filename,".")+1); 32646493Sabial strcat(buff,"\r\n"); 32746493Sabial } 32846493Sabial write(con_sock, buff, strlen(buff)); 32946493Sabial 33046493Sabial strftime(buff, 50, "Last-Modified: %a, %d %h %Y %H:%M:%S %Z\r\n\r\n", gmtime(&file_status.st_mtime)); 33146493Sabial write(con_sock, buff, strlen(buff)); 33238589Sabial 33346493Sabial /* Send data only if GET request */ 33438589Sabial if (cmd == 1) { 33546493Sabial while (lg = read(fd, buff, 8192)) 33646493Sabial write(con_sock, buff, lg); 33738589Sabial } 33838589Sabial 33946493Sabialend_request: 34038589Sabial close(fd); 34138589Sabial close(con_sock); 34238589Sabial 34338589Sabial} 34438589Sabial 34546493Sabial/* 34646493Sabial * Simple httpd server for use in PicoBSD or other embedded application. 34746493Sabial * Should satisfy simple httpd needs. For more demanding situations 34846493Sabial * apache is probably a better (but much larger) choice. 34946493Sabial */ 35046493Sabialmain(int argc, char *argv[]) 35138589Sabial{ 35246493Sabial extern char *optarg; 35346493Sabial extern int optind; 35446493Sabial int bflag, ch, fd, ld; 35546493Sabial int lg; 35646493Sabial int httpd_group = 65534; 35746493Sabial pid_t server_pid; 35846493Sabial 35946493Sabial /* Default for html directory */ 36038589Sabial strcpy (homedir,getenv("HOME")); 36138589Sabial if (!geteuid()) strcpy (homedir,"/httphome"); 36238589Sabial else strcat (homedir,"/httphome"); 36338589Sabial 36446493Sabial /* Defaults for log file */ 36546493Sabial if (geteuid()) { 36646493Sabial strcpy(logfile,getenv("HOME")); 36746493Sabial strcat(logfile,"/"); 36846493Sabial strcat(logfile,"jhttp.log"); 36946493Sabial } else 37046493Sabial strcpy(logfile,"/var/log/jhttpd.log"); 37138589Sabial 37246493Sabial /* Parse command line arguments */ 37346493Sabial while ((ch = getopt(argc, argv, "d:f:g:l:p:vDh")) != -1) 37446493Sabial switch (ch) { 37546493Sabial case 'd': 37646493Sabial strcpy(homedir,optarg); 37746493Sabial break; 37846493Sabial case 'f': 37946493Sabial daemonize = 0; 38046493Sabial verbose = 1; 38146493Sabial strcpy(fetch_mode,optarg); 38246493Sabial break; 38346493Sabial case 'g': 38446493Sabial httpd_group = atoi(optarg); 38546493Sabial break; 38646493Sabial case 'l': 38746493Sabial strcpy(logfile,optarg); 38846493Sabial break; 38946493Sabial case 'p': 39046493Sabial http_port = atoi(optarg); 39146493Sabial break; 39246493Sabial case 'v': 39346493Sabial verbose = 1; 39446493Sabial break; 39546493Sabial case 'D': 39646493Sabial daemonize = 0; 39746493Sabial break; 39846493Sabial case '?': 39946493Sabial case 'h': 40046493Sabial default: 40146493Sabial printf("usage: simple_httpd [[-d directory][-g grpid][-l logfile][-p port][-vD]]\n"); 40246493Sabial exit(1); 40346493Sabial /* NOTREACHED */ 40446493Sabial } 40546493Sabial 40646493Sabial /* Not running as root and no port supplied, assume 1080 */ 40746493Sabial if ((http_port == 80) && geteuid()) { 40846493Sabial http_port = 1080; 40946493Sabial } 41046493Sabial 41146493Sabial /* Do we really have rights in the html directory? */ 41246493Sabial if (fetch_mode[0] == NULL) { 41346493Sabial if (chdir(homedir)) { 41446493Sabial perror("chdir"); 41546493Sabial puts(homedir); 41646493Sabial exit(1); 41746493Sabial } 41846493Sabial } 41946493Sabial 42046493Sabial /* Create log file if it doesn't exit */ 42146493Sabial if ((access(logfile,W_OK)) && daemonize) { 42246493Sabial ld = open (logfile,O_WRONLY); 42346493Sabial chmod (logfile,00600); 42446493Sabial close(ld); 42546493Sabial } 42646493Sabial 42738589Sabial init_servconnection(); 42838589Sabial 42946493Sabial if (verbose) { 43046493Sabial printf("Server started with options \n"); 43146493Sabial printf("port: %d\n",http_port); 43246493Sabial if (fetch_mode[0] == NULL) printf("html home: %s\n",homedir); 43346493Sabial if (daemonize) printf("logfile: %s\n",logfile); 43446493Sabial } 43538589Sabial 43646493Sabial /* httpd is spawned */ 43746493Sabial if (daemonize) { 43846493Sabial if (server_pid = fork()) { 43946493Sabial wait3(0,WNOHANG,0); 44046493Sabial if (verbose) printf("pid: %d\n",server_pid); 44146493Sabial exit(0); 44246493Sabial } 44346493Sabial wait3(0,WNOHANG,0); 44446493Sabial } 44538589Sabial 44646493Sabial if (fetch_mode[0] == NULL) setpgrp(0,httpd_group); 44746493Sabial 44846493Sabial /* How many connections do you want? 44946493Sabial * Keep this lower than the available number of processes 45046493Sabial */ 45146493Sabial if (listen(http_sock,15) < 0) exit(1); 45246493Sabial 45338589Sabial label: 45446493Sabial wait_connection(); 45546493Sabial 45646493Sabial if (fork()) { 45746493Sabial wait3(0,WNOHANG,0); 45846493Sabial close(con_sock); 45946493Sabial goto label; 46046493Sabial } 46146493Sabial 46246493Sabial http_request(); 46346493Sabial 46446493Sabial wait3(0,WNOHANG,0); 46546493Sabial exit(0); 46638589Sabial} 46738589Sabial 46838589Sabial 46938589Sabialchar *adate() 47038589Sabial{ 47138589Sabial static char out[50]; 47238589Sabial long now; 47338589Sabial struct tm *t; 47438589Sabial time(&now); 47538589Sabial t = localtime(&now); 47643939Sabial sprintf(out, "%02d:%02d:%02d %02d/%02d/%02d", 47743939Sabial t->tm_hour, t->tm_min, t->tm_sec, 47843939Sabial t->tm_mday, t->tm_mon+1, t->tm_year ); 47938589Sabial return out; 48038589Sabial} 481