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http_server1.cc
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http_server1.cc
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#include "minet_socket.h"
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#define BUFSIZE 1024
#define FILENAMESIZE 100
int handle_connection(int);
int writenbytes(int,char *,int);
int readnbytes(int,char *,int);
int main(int argc,char *argv[])
{
int server_port;
int sock,sock2;
struct sockaddr_in sa,sa2;
int rc;
/* parse command line args */
if (argc != 3)
{
fprintf(stderr, "usage: http_server1 k|u port\n");
exit(-1);
}
server_port = atoi(argv[2]);
if (server_port < 1500)
{
fprintf(stderr,"INVALID PORT NUMBER: %d; can't be < 1500\n",server_port);
exit(-1);
}
/* initialize and make socket */
if (toupper(*(argv[1]))=='K') {
minet_init(MINET_KERNEL);
} else if (toupper(*(argv[1]))=='U') {
minet_init(MINET_USER);
} else {
fprintf(stderr, "First argument must be k or u\n");
exit(-1);
}
sock = minet_socket(SOCK_STREAM);
if (sock < 0)
{
minet_perror("couldn't make socket\n");
exit(-1);
}
/* set server address*/
memset(&sa, 0, sizeof sa);
sa.sin_port = htons(server_port);
sa.sin_addr.s_addr = htonl(INADDR_ANY);
sa.sin_family = AF_INET;
/* bind listening socket */
rc = minet_bind(sock,&sa);
if (rc < 0)
{
minet_perror("couldn't bind\n");
exit(-1);
}
/* start listening */
rc = minet_listen(sock,5);
if (rc < 0)
{
minet_perror("couldn't listen\n");
exit(-1);
}
/* connection handling loop */
while(1)
{
sock2 = minet_accept(sock,&sa2);
if (sock2 < 0)
{
minet_perror("Error accepting a connection ");
continue;
}
rc = handle_connection(sock2);
}
}
int handle_connection(int sock2)
{
char filename[FILENAMESIZE+1];
int rc;
int fd;
struct stat filestat;
char buf[BUFSIZE+1];
char *headers;
char *endheaders;
char *bptr;
int datalen=0;
char *ok_response_f = "HTTP/1.0 200 OK\r\n"\
"Content-type: text/plain\r\n"\
"Content-length: %d \r\n\r\n";
char ok_response[100];
char *notok_response = "HTTP/1.0 404 FILE NOT FOUND\r\n"\
"Content-type: text/html\r\n\r\n"\
"<html><body bgColor=black text=white>\n"\
"<h2>404 FILE NOT FOUND</h2>\n"
"</body></html>\n";
bool ok=true;
/* first read loop -- get request and headers*/
while ((rc = minet_read(sock2,buf+datalen,BUFSIZE-datalen)) > 0)
{
datalen += rc;
buf[datalen] = '\0';
if ((endheaders = strstr(buf,"\r\n\r\n")) != NULL)
{
endheaders[2] = '\0';
endheaders += 4;
headers =(char *) malloc(strlen(buf)+1); //not used here, for future
strcpy(headers,buf);
break;
}
}
if (rc < 0)
{
minet_perror("Error reading request\n");
minet_close(sock2);
return -1;
}
/* parse request to get file name */
/* Assumption: this is a GET request and filename contains no spaces*/
bptr = buf;
strsep(&bptr," ");
bptr = strsep(&bptr," ");
if (bptr == NULL)
{
ok = false;
}
else
{
if (strlen(bptr) > FILENAMESIZE)
{
fprintf(stderr,"Filename too big\n");
minet_close(sock2);
return -1;
}
if (bptr[0] == '/')
bptr += 1;
strcpy(filename,bptr);
/* try opening the file */
fd = open(filename,O_RDONLY);
if (fd < 0)
{
ok = false;
//printf("couldn't open file %s\n",filename);
}
}
/* send response */
if (ok)
{
/* send headers */
rc = stat(filename,&filestat);
if (rc < 0)
{
perror("error getting file stat ");
minet_close(sock2);
return -1;
}
sprintf(ok_response,ok_response_f,filestat.st_size);
rc = writenbytes(sock2,ok_response,strlen(ok_response));
if (rc < 0)
{
minet_perror("error writing response\n");
minet_close(sock2);
return -1;
}
/* send file */
while ((rc = read(fd,buf,BUFSIZE)) != 0)
{
if (rc < 0)
{
fprintf(stderr,"error reading requested file %s\n",filename);
break;
}
else
{
rc = writenbytes(sock2, buf, rc);
if (rc < 0)
{
minet_perror("error writing response\n");
minet_close(sock2);
return -1;
}
}
}
}
else
{
rc = writenbytes(sock2,notok_response,strlen(notok_response));
if (rc < 0)
{
minet_perror("error writing response\n");
minet_close(sock2);
return -1;
}
}
//free(headers);
minet_close(sock2);
if (ok)
return 0;
else
return -1;
}
int readnbytes(int fd,char *buf,int size)
{
int rc = 0;
int totalread = 0;
while ((rc = minet_read(fd,buf+totalread,size-totalread)) > 0)
totalread += rc;
if (rc < 0)
{
return -1;
}
else
return totalread;
}
int writenbytes(int fd,char *str,int size)
{
int rc = 0;
int totalwritten =0;
while ((rc = minet_write(fd,str+totalwritten,size-totalwritten)) > 0)
totalwritten += rc;
if (rc < 0)
return -1;
else
return totalwritten;
}