run server
(cd ./site/content/chapter11/code; make && ./tiny.12 5000)
visit http://localhost:5000/post-home.html and submit
POST method pass param by message-body behind Headers part. When we input 9 and 10 and submit, socket pass content
POST /cgi-bin/post-adder HTTP/1.1
Host: localhost:5000
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 16
Referer: http://localhost:5000/post-home.html
Cookie: _ga=GA1.1.1286836072.1494744693
Connection: keep-alive
Upgrade-Insecure-Requests: 1
(CRLF here, message-body below)
first=9&second=10
Content-Length marks the length of message-body.
use readnb to fetch post param.
--- tiny.origin.c 2021-02-25 07:26:33.302592754 +0000
+++ tiny.12.c 2021-02-25 07:26:33.302592754 +0000
@@ -5,7 +5,7 @@
#include "csapp.h"
void doit(int fd);
-void read_requesthdrs(rio_t *rp);
+int read_requesthdrs(rio_t *rp, char *method);
int parse_uri(char *uri, char *filename, char *cgiargs);
void serve_static(int fd, char *filename, int filesize);
void get_filetype(char *filename, char *filetype);
@@ -55,12 +55,14 @@
return;
printf("%s", buf);
sscanf(buf, "%s %s %s", method, uri, version); //line:netp:doit:parserequest
- if (strcasecmp(method, "GET")) { //line:netp:doit:beginrequesterr
+ if (!(strcasecmp(method, "GET") == 0 || strcasecmp(method, "POST") == 0)) {
clienterror(fd, method, "501", "Not Implemented",
"Tiny does not implement this method");
return;
} //line:netp:doit:endrequesterr
- read_requesthdrs(&rio); //line:netp:doit:readrequesthdrs
+ int param_len = read_requesthdrs(&rio, method);
+
+ Rio_readnb(&rio, buf, param_len);
/* Parse URI from GET request */
is_static = parse_uri(uri, filename, cgiargs); //line:netp:doit:staticcheck
@@ -84,24 +86,29 @@
"Tiny couldn't run the CGI program");
return;
}
- serve_dynamic(fd, filename, cgiargs); //line:netp:doit:servedynamic
+ if (strcasecmp(method, "GET") == 0)
+ serve_dynamic(fd, filename, cgiargs);
+ else
+ serve_dynamic(fd, filename, buf);
}
}
/*
* read_requesthdrs - read HTTP request headers
*/
-void read_requesthdrs(rio_t *rp)
+int read_requesthdrs(rio_t *rp, char *method)
{
char buf[MAXLINE];
+ int len = 0;
- Rio_readlineb(rp, buf, MAXLINE);
- printf("%s", buf);
- while(strcmp(buf, "\r\n")) { //line:netp:readhdrs:checkterm
+ do {
Rio_readlineb(rp, buf, MAXLINE);
printf("%s", buf);
- }
- return;
+ if (strcasecmp(method, "POST") == 0 && strncasecmp(buf, "Content-Length:", 15) == 0)
+ sscanf(buf, "Content-Length: %d", &len);
+ } while(strcmp(buf, "\r\n"));
+
+ return len;
}
/*
* parse_uri - parse URI into filename and CGI args
post-adder code
/*
* post-adder.c - a minimal CGI program that adds two numbers together
*/
#include "../csapp.h"
int main(void) {
char *buf, *p;
char arg1[MAXLINE], arg2[MAXLINE], content[MAXLINE];
int n1=0, n2=0;
/* Extract the two arguments */
if ((buf = getenv("QUERY_STRING")) != NULL) {
p = strchr(buf, '&');
*p = '\0';
sscanf(buf, "first=%d", &n1);
sscanf(p+1, "second=%d", &n2);
}
/* Make the response body */
sprintf(content, "Welcome to add.com: ");
sprintf(content, "%sTHE Internet addition portal.\r\n<p>", content);
sprintf(content, "%sThe answer is: %d + %d = %d\r\n<p>",
content, n1, n2, n1 + n2);
sprintf(content, "%sThanks for visiting!\r\n", content);
/* Generate the HTTP response */
printf("Connection: close\r\n");
printf("Content-length: %d\r\n", (int)strlen(content));
printf("Content-type: text/html\r\n\r\n");
printf("%s", content);
fflush(stdout);
exit(0);
}