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request.c
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request.c
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/*
* request.c: Does the bulk of the work for the web server.
*/
#include "networks.h"
#include "request.h"
/*
* Request error processing function.
*/
void requestError(int fd, char *cause, char *errnum, char *shortmsg, char *longmsg) {
char buf[MAXLINE], body[MAXBUF];
// Create the body of the error message
sprintf(body, "<html><title>networks Error</title>");
sprintf(body, "%s<body bgcolor=""fffff"">\r\n", body);
sprintf(body, "%s%s: %s\r\n", body, errnum, shortmsg);
sprintf(body, "%s<p>%s: %s\r\n", body, longmsg, cause);
sprintf(body, "%s<hr>networks Web Server\r\n", body);
// Write out the header information for this response
sprintf(buf, "HTTP/1.0 %s %s\r\n", errnum, shortmsg);
Rio_writen(fd, buf, strlen(buf));
printf("%s", buf);
sprintf(buf, "Content-Type: text/html\r\n");
Rio_writen(fd, buf, strlen(buf));
printf("%s", buf);
sprintf(buf, "Content-Length: %lu\r\n\r\n", strlen(body));
Rio_writen(fd, buf, strlen(buf));
printf("%s", buf);
// Write out the content
Rio_writen(fd, body, strlen(body));
printf("%s", body);
}
/*
* Reads and discards everything up to an empty text line
*/
void requestReadhdrs(rio_t *rp) {
char buf[MAXLINE];
Rio_readlineb(rp, buf, MAXLINE);
while (strcmp(buf, "\r\n")) {
Rio_readlineb(rp, buf, MAXLINE);
}
return;
}
/*
* Calculates filename (and cgiargs, for dynamic) from uri.
*
* Return 1 if static, 0 if dynamic content.
*/
int requestParseURI(char *uri, char *filename, char *cgiargs) {
char *ptr;
if (!strstr(uri, "cgi")) {
// static
strcpy(cgiargs, "");
sprintf(filename, ".%s", uri);
if (uri[strlen(uri)-1] == '/') {
strcat(filename, "home.html");
}
return 1;
} else {
// dynamic
ptr = index(uri, '?');
if (ptr) {
strcpy(cgiargs, ptr+1);
*ptr = '\0';
} else {
strcpy(cgiargs, "");
}
sprintf(filename, ".%s", uri);
return 0;
}
}
/*
* Fills in the filetype given the filename
*/
void requestGetFiletype(char *filename, char *filetype) {
if (strstr(filename, ".html"))
strcpy(filetype, "text/html");
else if (strstr(filename, ".gif"))
strcpy(filetype, "image/gif");
else if (strstr(filename, ".jpg"))
strcpy(filetype, "image/jpeg");
else
strcpy(filetype, "text/plain");
}
/*
* Request dynamic server.
*/
void requestServeDynamic(int fd, char *filename, char *cgiargs) {
char buf[MAXLINE], *emptylist[] = {NULL};
// The server does only a little bit of the header.
// The CGI script has to finish writing out the header.
sprintf(buf, "HTTP/1.0 200 OK\r\n");
sprintf(buf, "%sServer: networks Web Server\r\n", buf);
Rio_writen(fd, buf, strlen(buf));
if (Fork() == 0) {
/* Child process */
Setenv("QUERY_STRING", cgiargs, 1);
/* When the CGI process writes to stdout, it will instead go to the socket */
Dup2(fd, STDOUT_FILENO);
Execve(filename, emptylist, environ);
}
Wait(NULL);
}
/*
* Request static server.
*/
void requestServeStatic(int fd, char *filename, int filesize) {
int srcfd;
char *srcp, filetype[MAXLINE], buf[MAXBUF];
requestGetFiletype(filename, filetype);
srcfd = Open(filename, O_RDONLY, 0);
// Rather than call read() to read the file into memory,
// which would require that we allocate a buffer, we memory-map the file
srcp = Mmap(0, filesize, PROT_READ, MAP_PRIVATE, srcfd, 0);
Close(srcfd);
// put together response
sprintf(buf, "HTTP/1.0 200 OK\r\n");
sprintf(buf, "%sServer: networks Web Server\r\n", buf);
sprintf(buf, "%sContent-Length: %d\r\n", buf, filesize);
sprintf(buf, "%sContent-Type: %s\r\n\r\n", buf, filetype);
Rio_writen(fd, buf, strlen(buf));
// Writes out to the client socket the memory-mapped file
Rio_writen(fd, srcp, filesize);
Munmap(srcp, filesize);
}
/*
* Handle a request.
*/
void requestHandle(int fd, thread *worker) {
int is_static;
struct stat sbuf;
char buf[MAXLINE], method[MAXLINE], uri[MAXLINE], version[MAXLINE];
char filename[MAXLINE], cgiargs[MAXLINE];
rio_t rio;
Rio_readinitb(&rio, fd);
Rio_readlineb(&rio, buf, MAXLINE);
sscanf(buf, "%s %s %s", method, uri, version);
printf("%s %s %s\n", method, uri, version);
if (strcasecmp(method, "GET")) {
requestError(fd, method, "501", "Not Implemented", "networks Server does not implement this method");
return;
}
requestReadhdrs(&rio);
is_static = requestParseURI(uri, filename, cgiargs);
if (stat(filename, &sbuf) < 0) {
requestError(fd, filename, "404", "Not found", "networks Server could not find this file");
return;
}
if (is_static) {
if (!(S_ISREG(sbuf.st_mode)) || !(S_IRUSR & sbuf.st_mode)) {
requestError(fd, filename, "403", "Forbidden", "networks Server could not read this file");
return;
}
worker->statics++;
requestServeStatic(fd, filename, sbuf.st_size);
} else {
if (!(S_ISREG(sbuf.st_mode)) || !(S_IXUSR & sbuf.st_mode)) {
requestError(fd, filename, "403", "Forbidden", "networks Server could not run this CGI program");
return;
}
worker->dynamics++;
requestServeDynamic(fd, filename, cgiargs);
}
}
/*
* Get request size.
*/
long requestFileSize(int fd) {
char buf[MAXLINE], method[MAXLINE], uri[MAXLINE], version[MAXLINE];
char filename[MAXLINE], cgiargs[MAXLINE];
struct stat s;
recv(fd, buf, sizeof(buf), MSG_PEEK);
sscanf(buf, "%s %s %s\n", method, uri, version);
requestParseURI(uri, filename, cgiargs);
Stat(filename, &s);
return (long) s.st_size;
}