ethernet: add a working Linux/C webserver as a reference
This commit is contained in:
Vince Weaver
parent
89f9e15ab5
commit
4f3017c723
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@ -2,7 +2,9 @@ CC = gcc
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CFLAGS = -Wall -O2
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LFLAGS =-lpcap
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all: testarp
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all: testarp webserver
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###
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testarp: testarp.o
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$(CC) $(LFLAGS) -o testarp testarp.o
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@ -10,5 +12,15 @@ testarp: testarp.o
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testarp.o: testarp.c
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$(CC) $(CFLAGS) -c testarp.c
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###
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webserver: webserver.o
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$(CC) $(LFLAGS) -o webserver webserver.o
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webserver.o: webserver.c
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$(CC) $(CFLAGS) -c webserver.c
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###
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clean:
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rm -f *~ *.o testarp
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rm -f *~ *.o testarp webserver
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@ -0,0 +1,14 @@
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<html>
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<head><title>About the VMW-web server</title></head>
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<body>
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<h1>About the VMW-web server</h1>
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I made it myself.
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<hr>
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<a href="/">Back</a>
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</body>
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</html>
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@ -0,0 +1,23 @@
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<html>
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<head><title>Sample web Page</title></head>
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<body>
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<center><img src="vmw_logo.png"></center>
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<h1><center>Sample Web Page</center></h1>
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Just testing out a barebones webserver for ECE435.<br><br>
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<a href="about.html">More info</a><br><br>
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<a href="invalid.html">Invalid Link</a><br><br>
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<a href="teapot.html">Teapot Link</a><br><br>
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<hr>
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Back to <a href="http://www.deater.net/weave/vmwprod/">My Web Page</a>
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</body>
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</html>
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Binary file not shown.
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After Width: | Height: | Size: 3.3 KiB |
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@ -0,0 +1,357 @@
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <time.h>
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#define BUFFER_SIZE 256
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/* assume the max command we get is this big */
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#define RECEIVE_BUFFER_SIZE 4096
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/* Default port to listen on */
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#define DEFAULT_PORT 80
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#define MIME_HTML 0
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#define MIME_TXT 1
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#define MIME_PNG 2
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#define MIME_JPG 3
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#define MIME_MAX 4
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struct mime_type {
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char extension[5];
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char string[32];
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};
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struct mime_type mime[MIME_MAX] = {
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{"html", "text/html"},
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{"txt", "text/plain"},
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{"png", "image/png"},
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{"jpg", "image/jpeg"},
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};
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static int detect_mime(char *filename) {
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int i,j;
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i=strlen(filename);
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while(i>0) {
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if (filename[i]=='.') break;
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i--;
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}
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i++;
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for(j=0;j<MIME_MAX;j++) {
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if (!strcmp(filename+i,mime[j].extension)) {
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printf("Found filetype %s\n",mime[j].string);
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return j;
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}
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}
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return MIME_HTML;
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}
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static int serve_file(int fd, char *filename) {
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int n,result,mime_type,out_size=0;
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char time_string[1000];
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time_t now = time(NULL);
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struct tm tm = *gmtime(&now);
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struct stat stat_buf;
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char out_buffer[4096];
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strftime(time_string, sizeof(time_string),
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"%a, %d %b %Y %H:%M:%S %Z", &tm);
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result=stat(filename,&stat_buf);
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mime_type=detect_mime(filename);
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if (strstr(filename,"teapot")) {
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char message418[]=
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"<html><head>\r\n"
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"<title>418 I'm a teapot</title>\r\n"
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"</head><body>\r\n"
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"<h1>I'm a Teapot</h1>\r\n"
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"<p>I'm a *little* teapot.<br />\r\n"
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"</p>\r\n"
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"</body></html>\r\n";
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sprintf(out_buffer,
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"HTTP/1.1 418 I'm a teapot\r\n"
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"Date: %s\r\n"
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"Server: VMW-web\r\n"
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"Content-Length: %d\r\n"
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"Connection: close\r\n"
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"Content-Type: text/html; charset=iso-8859-1\r\n"
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"\r\n"
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"%s",
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time_string,(int)strlen(message418),message418);
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out_size=strlen(out_buffer);
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} else if (result<0) {
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char message404[]=
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"<html><head>\r\n"
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"<title>400 Bad Request</title>\r\n"
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"</head><body>\r\n"
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"<h1>Bad Request</h1>\r\n"
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"<p>Your browser sent a request that this server could not understand.<br />\r\n"
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"</p>\r\n"
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"</body></html>\r\n";
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sprintf(out_buffer,
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"HTTP/1.1 400 Bad Request\r\n"
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"Date: %s\r\n"
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"Server: VMW-web\r\n"
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"Content-Length: %d\r\n"
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"Connection: close\r\n"
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"Content-Type: text/html; charset=iso-8859-1\r\n"
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"\r\n"
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"%s",
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time_string,(int)strlen(message404),message404);
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out_size=strlen(out_buffer);
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}
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else {
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char mod_string[1000];
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tm = *gmtime(&stat_buf.st_mtime);
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int in_fd,out_offset;
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char file_buffer[256];
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strftime(mod_string, sizeof(mod_string),
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"%a, %d %b %Y %H:%M:%S %Z", &tm);
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sprintf(out_buffer,
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"HTTP/1.1 200 OK\r\n"
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"Date: %s\r\n"
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"Server: VMW-web\r\n"
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"Last-Modified: %s\r\n"
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"Content-Length: %ld\r\n"
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"Content-Type: %s\r\n"
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"\r\n",
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time_string,
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mod_string,
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stat_buf.st_size,
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mime[mime_type].string);
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out_offset=strlen(out_buffer);
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in_fd=open(filename,O_RDONLY);
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if (in_fd<0) {
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fprintf(stderr,"Could not open %s\n",filename);
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} else {
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while(1) {
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result=read(in_fd,&file_buffer,256);
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if (result<=0) break;
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memcpy(out_buffer+out_offset,
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file_buffer,result);
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out_offset+=result;
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}
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close(in_fd);
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}
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out_size=out_offset;
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}
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/* Send a response */
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printf("Sending:\n");
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printf("%s\n",out_buffer);
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n = write(fd,out_buffer,out_size);
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if (n<0) {
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fprintf(stderr,"Error writing. %s\n",
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strerror(errno));
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}
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return 0;
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}
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int main(int argc, char **argv) {
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int socket_fd,new_socket_fd;
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struct sockaddr_in server_addr, client_addr;
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struct addrinfo hints,*server_info;
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int port=DEFAULT_PORT;
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int n;
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socklen_t client_len;
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char buffer[BUFFER_SIZE];
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char in[RECEIVE_BUFFER_SIZE];
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int i,result,in_ptr=0;
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char port_string[BUFFER_SIZE];
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if (argc>1) {
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port=atoi(argv[1]);
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}
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sprintf(port_string,"%d",port);
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printf("Starting server on port %d\n",port);
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_INET;
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hints.ai_socktype = SOCK_STREAM;
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/* Null means localhost */
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/* How can we get IP of default interface? */
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result=getaddrinfo(NULL,port_string,&hints,&server_info);
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if (result<0) {
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fprintf(stderr,"Error getaddrinfo!\n");
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return -1;
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}
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/* Open a socket to listen on */
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/* AF_INET means an IPv4 connection */
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/* SOCK_STREAM means reliable two-way connection (TCP) */
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socket_fd = socket(hints.ai_family, hints.ai_socktype, hints.ai_protocol);
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if (socket_fd<0) {
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fprintf(stderr,"Error opening socket! %s\n",
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strerror(errno));
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return -1;
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}
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/* Set up the server address to listen on */
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memset(&server_addr,0,sizeof(struct sockaddr_in));
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server_addr.sin_family=AF_INET;
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/* Convert the port we want to network byte order */
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server_addr.sin_port=htons(port);
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/* Bind to the port */
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if (bind(socket_fd, server_info->ai_addr,server_info->ai_addrlen)) {
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fprintf(stderr,"Error binding! %s\n", strerror(errno));
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return -1;
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}
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/* Tell the server we want to listen on the port */
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/* Second argument is backlog, how many pending connections can */
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/* build up */
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listen(socket_fd,5);
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listen_connection:
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/* Call accept to create a new file descriptor for an incoming */
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/* connection. It takes the oldest one off the queue */
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/* We're blocking so it waits here until a connection happens */
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client_len=sizeof(client_addr);
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new_socket_fd = accept(socket_fd,
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(struct sockaddr *)&client_addr,&client_len);
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if (new_socket_fd<0) {
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fprintf(stderr,"Error accepting! %s\n",strerror(errno));
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}
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in_ptr=0;
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while(1) {
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/* Someone connected! Let's try to read BUFFER_SIZE-1 bytes */
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memset(buffer,0,BUFFER_SIZE);
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n = read(new_socket_fd,buffer,(BUFFER_SIZE-1));
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if (n==0) {
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fprintf(stderr,"Connection to client lost\n\n");
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break;
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}
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else if (n<0) {
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fprintf(stderr,"Error reading from socket %s\n",
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strerror(errno));
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}
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if (in_ptr+n>RECEIVE_BUFFER_SIZE) {
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fprintf(stderr,"Overflow receive buffer!\n");
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break;
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}
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memcpy(&in[in_ptr],buffer,n);
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in_ptr+=n;
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in[in_ptr]=0;
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/* See if last chars were CRLFCRLF (empty line) */
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/* Which indicates done talking */
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if ((in[in_ptr-1]=='\n') && (in[in_ptr-3]=='\n')) {
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break;
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}
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}
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/* Print the message we received */
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char filename[BUFSIZ];
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printf("Request from webserver:\n");
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i=0;
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int found_filename=0,file_ptr=0;
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while(i<strlen(in)) {
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if (!found_filename) {
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if (in[i]=='G') {
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printf("G"); i++;
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if (in[i]=='E') {
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printf("E"); i++;
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if (in[i]=='T') {
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printf("T"); i++;
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if (in[i]==' ') {
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printf(" "); i++;
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found_filename=1;
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while(in[i]!=' ') {
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filename[file_ptr]=in[i];
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printf("%c",in[i]);
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i++;
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file_ptr++;
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if (file_ptr>BUFSIZ) break;
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}
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filename[file_ptr]=0;
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}
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}
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}
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}
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}
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printf("%c",in[i]);
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i++;
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}
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if (!strcmp(filename,"/")) {
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printf("Mapping / to index.html\n");
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strcpy(filename,"/index.html");
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}
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printf("Sending back file: %s\n",filename);
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/* Skip leading / */
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serve_file(new_socket_fd,filename+1);
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printf("Exiting server\n\n");
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/* Try to avoid TIME_WAIT */
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// sleep(1);
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/* Close the sockets */
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close(new_socket_fd);
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goto listen_connection;
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close(socket_fd);
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return 0;
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}
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