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/*
* Copyright (c) 2021 Omar Polo <op@omarpolo.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Test program for fastcgi. It speaks the protocol over stdin.
* Can't handle more than one request at the same time.
*/
#include "../config.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define FCGI_VERSION_1 1
/* subset of records that matters to us */
#define FCGI_BEGIN_REQUEST 1
#define FCGI_END_REQUEST 3
#define FCGI_PARAMS 4
#define FCGI_STDIN 5
#define FCGI_STDOUT 6
#define SUM(a, b) (((a) << 8) + (b))
struct fcgi_header {
uint8_t version;
uint8_t type;
uint8_t req_id1;
uint8_t req_id0;
uint8_t content_len1;
uint8_t content_len0;
uint8_t padding;
uint8_t reserved;
};
struct fcgi_end_req_body {
unsigned char app_status3;
unsigned char app_status2;
unsigned char app_status1;
unsigned char app_status0;
unsigned char proto_status;
unsigned char reserved[3];
};
static int
prepare_header(struct fcgi_header *h, int type, int id, size_t size,
size_t padding)
{
memset(h, 0, sizeof(*h));
h->version = FCGI_VERSION_1;
h->type = type;
h->req_id1 = (id >> 8);
h->req_id0 = (id & 0xFF);
h->content_len1 = (size >> 8);
h->content_len0 = (size & 0xFF);
h->padding = padding;
return 0;
}
static int
must_read(int sock, void *d, size_t len)
{
ssize_t r;
for (;;) {
switch (r = read(sock, d, len)) {
case -1:
case 0:
return -1;
default:
if (r == (ssize_t)len)
return 0;
len -= r;
d += r;
}
}
}
static int
consume(int fd, size_t len)
{
size_t l;
char buf[64];
while (len != 0) {
if ((l = len) > sizeof(buf))
l = sizeof(buf);
if (must_read(fd, buf, l) == -1)
return 0;
len -= l;
}
return 1;
}
static void
read_header(struct fcgi_header *hdr)
{
if (must_read(0, hdr, sizeof(*hdr)) == -1)
exit(1);
}
/* read and consume a record of the given type */
static void
assert_record(int type)
{
struct fcgi_header hdr;
read_header(&hdr);
if (hdr.type != type)
errx(1, "expected record type %d; got %d",
type, hdr.type);
consume(0, SUM(hdr.content_len1, hdr.content_len0));
consume(0, hdr.padding);
}
int
main(void)
{
struct fcgi_header hdr;
struct fcgi_end_req_body end;
const char *msg;
size_t len;
msg = "20 text/gemini\r\n# Hello, world!\n";
len = strlen(msg);
for (;;) {
warnx("waiting for a request");
assert_record(FCGI_BEGIN_REQUEST);
/* read params */
for (;;) {
read_header(&hdr);
consume(0, SUM(hdr.content_len1, hdr.content_len0));
consume(0, hdr.padding);
if (hdr.type != FCGI_PARAMS)
errx(1, "got %d; expecting PARAMS", hdr.type);
if (hdr.content_len0 == 0 &&
hdr.content_len1 == 0 &&
hdr.padding == 0)
break;
}
assert_record(FCGI_STDIN);
warnx("sending the response");
prepare_header(&hdr, FCGI_STDOUT, 1, len, 0);
write(0, &hdr, sizeof(hdr));
write(0, msg, len);
warnx("closing the request");
prepare_header(&hdr, FCGI_END_REQUEST, 1, sizeof(end), 0);
write(0, &hdr, sizeof(hdr));
memset(&end, 0, sizeof(end));
write(0, &end, sizeof(end));
}
}
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