1 03fcfb79 2021-06-12 op /*
  2 03fcfb79 2021-06-12 op  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
  3 03fcfb79 2021-06-12 op  *
  4 03fcfb79 2021-06-12 op  * Permission to use, copy, modify, and distribute this software for any
  5 03fcfb79 2021-06-12 op  * purpose with or without fee is hereby granted, provided that the above
  6 03fcfb79 2021-06-12 op  * copyright notice and this permission notice appear in all copies.
  7 03fcfb79 2021-06-12 op  *
  8 03fcfb79 2021-06-12 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 03fcfb79 2021-06-12 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 03fcfb79 2021-06-12 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 03fcfb79 2021-06-12 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 03fcfb79 2021-06-12 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 03fcfb79 2021-06-12 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 03fcfb79 2021-06-12 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 03fcfb79 2021-06-12 op  */
 16 03fcfb79 2021-06-12 op 
 17 03fcfb79 2021-06-12 op /*
 18 03fcfb79 2021-06-12 op  * Test program for fastcgi.  It speaks the protocol over stdin.
 19 03fcfb79 2021-06-12 op  * Can't handle more than one request at the same time.
 20 03fcfb79 2021-06-12 op  */
 21 03fcfb79 2021-06-12 op 
 22 03fcfb79 2021-06-12 op #include "../config.h"
 23 03fcfb79 2021-06-12 op 
 24 03fcfb79 2021-06-12 op #include <stdint.h>
 25 03fcfb79 2021-06-12 op #include <stdio.h>
 26 89c110fe 2021-06-15 op #include <stdlib.h>
 27 03fcfb79 2021-06-12 op #include <string.h>
 28 03fcfb79 2021-06-12 op #include <unistd.h>
 29 03fcfb79 2021-06-12 op 
 30 03fcfb79 2021-06-12 op #define FCGI_VERSION_1	1
 31 03fcfb79 2021-06-12 op 
 32 03fcfb79 2021-06-12 op /* subset of records that matters to us */
 33 03fcfb79 2021-06-12 op #define FCGI_BEGIN_REQUEST	 1
 34 03fcfb79 2021-06-12 op #define FCGI_END_REQUEST	 3
 35 03fcfb79 2021-06-12 op #define FCGI_PARAMS		 4
 36 03fcfb79 2021-06-12 op #define FCGI_STDIN		 5
 37 03fcfb79 2021-06-12 op #define FCGI_STDOUT		 6
 38 03fcfb79 2021-06-12 op 
 39 03fcfb79 2021-06-12 op #define SUM(a, b) (((a) << 8) + (b))
 40 03fcfb79 2021-06-12 op 
 41 03fcfb79 2021-06-12 op struct fcgi_header {
 42 03fcfb79 2021-06-12 op 	uint8_t version;
 43 03fcfb79 2021-06-12 op 	uint8_t type;
 44 03fcfb79 2021-06-12 op 	uint8_t req_id1;
 45 03fcfb79 2021-06-12 op 	uint8_t req_id0;
 46 03fcfb79 2021-06-12 op 	uint8_t content_len1;
 47 03fcfb79 2021-06-12 op 	uint8_t content_len0;
 48 03fcfb79 2021-06-12 op 	uint8_t padding;
 49 03fcfb79 2021-06-12 op 	uint8_t reserved;
 50 03fcfb79 2021-06-12 op };
 51 03fcfb79 2021-06-12 op 
 52 03fcfb79 2021-06-12 op struct fcgi_end_req_body {
 53 03fcfb79 2021-06-12 op 	unsigned char app_status3;
 54 03fcfb79 2021-06-12 op 	unsigned char app_status2;
 55 03fcfb79 2021-06-12 op 	unsigned char app_status1;
 56 03fcfb79 2021-06-12 op 	unsigned char app_status0;
 57 03fcfb79 2021-06-12 op 	unsigned char proto_status;
 58 03fcfb79 2021-06-12 op 	unsigned char reserved[3];
 59 03fcfb79 2021-06-12 op };
 60 03fcfb79 2021-06-12 op 
 61 03fcfb79 2021-06-12 op static int
 62 03fcfb79 2021-06-12 op prepare_header(struct fcgi_header *h, int type, int id, size_t size,
 63 03fcfb79 2021-06-12 op     size_t padding)
 64 03fcfb79 2021-06-12 op {
 65 03fcfb79 2021-06-12 op 	memset(h, 0, sizeof(*h));
 66 03fcfb79 2021-06-12 op 
 67 03fcfb79 2021-06-12 op 	h->version = FCGI_VERSION_1;
 68 03fcfb79 2021-06-12 op         h->type = type;
 69 03fcfb79 2021-06-12 op 	h->req_id1 = (id >> 8);
 70 03fcfb79 2021-06-12 op 	h->req_id0 = (id & 0xFF);
 71 03fcfb79 2021-06-12 op 	h->content_len1 = (size >> 8);
 72 03fcfb79 2021-06-12 op 	h->content_len0 = (size & 0xFF);
 73 03fcfb79 2021-06-12 op 	h->padding = padding;
 74 03fcfb79 2021-06-12 op 
 75 03fcfb79 2021-06-12 op 	return 0;
 76 03fcfb79 2021-06-12 op }
 77 03fcfb79 2021-06-12 op 
 78 03fcfb79 2021-06-12 op static int
 79 03fcfb79 2021-06-12 op must_read(int sock, void *d, size_t len)
 80 03fcfb79 2021-06-12 op {
 81 03fcfb79 2021-06-12 op 	ssize_t r;
 82 03fcfb79 2021-06-12 op 
 83 03fcfb79 2021-06-12 op 	for (;;) {
 84 03fcfb79 2021-06-12 op 		switch (r = read(sock, d, len)) {
 85 03fcfb79 2021-06-12 op 		case -1:
 86 03fcfb79 2021-06-12 op 		case 0:
 87 03fcfb79 2021-06-12 op 			return -1;
 88 03fcfb79 2021-06-12 op 		default:
 89 03fcfb79 2021-06-12 op 			if (r == (ssize_t)len)
 90 03fcfb79 2021-06-12 op 				return 0;
 91 03fcfb79 2021-06-12 op 			len -= r;
 92 03fcfb79 2021-06-12 op 			d += r;
 93 03fcfb79 2021-06-12 op 		}
 94 03fcfb79 2021-06-12 op 	}
 95 03fcfb79 2021-06-12 op }
 96 03fcfb79 2021-06-12 op 
 97 03fcfb79 2021-06-12 op static int
 98 03fcfb79 2021-06-12 op consume(int fd, size_t len)
 99 03fcfb79 2021-06-12 op {
100 03fcfb79 2021-06-12 op 	size_t	l;
101 03fcfb79 2021-06-12 op 	char	buf[64];
102 03fcfb79 2021-06-12 op 
103 03fcfb79 2021-06-12 op 	while (len != 0) {
104 03fcfb79 2021-06-12 op 		if ((l = len) > sizeof(buf))
105 03fcfb79 2021-06-12 op 			l =  sizeof(buf);
106 03fcfb79 2021-06-12 op 		if (must_read(fd, buf, l) == -1)
107 03fcfb79 2021-06-12 op                         return 0;
108 03fcfb79 2021-06-12 op 		len -= l;
109 03fcfb79 2021-06-12 op 	}
110 03fcfb79 2021-06-12 op 
111 03fcfb79 2021-06-12 op 	return 1;
112 03fcfb79 2021-06-12 op }
113 03fcfb79 2021-06-12 op 
114 03fcfb79 2021-06-12 op static void
115 03fcfb79 2021-06-12 op read_header(struct fcgi_header *hdr)
116 03fcfb79 2021-06-12 op {
117 03fcfb79 2021-06-12 op 	if (must_read(0, hdr, sizeof(*hdr)) == -1)
118 89c110fe 2021-06-15 op 		exit(1);
119 03fcfb79 2021-06-12 op }
120 03fcfb79 2021-06-12 op 
121 03fcfb79 2021-06-12 op /* read and consume a record of the given type */
122 03fcfb79 2021-06-12 op static void
123 03fcfb79 2021-06-12 op assert_record(int type)
124 03fcfb79 2021-06-12 op {
125 03fcfb79 2021-06-12 op 	struct fcgi_header hdr;
126 03fcfb79 2021-06-12 op 
127 03fcfb79 2021-06-12 op 	read_header(&hdr);
128 03fcfb79 2021-06-12 op 
129 03fcfb79 2021-06-12 op 	if (hdr.type != type)
130 03fcfb79 2021-06-12 op 		errx(1, "expected record type %d; got %d",
131 03fcfb79 2021-06-12 op 		    type, hdr.type);
132 03fcfb79 2021-06-12 op 
133 03fcfb79 2021-06-12 op 	consume(0, SUM(hdr.content_len1, hdr.content_len0));
134 03fcfb79 2021-06-12 op 	consume(0, hdr.padding);
135 03fcfb79 2021-06-12 op }
136 03fcfb79 2021-06-12 op 
137 03fcfb79 2021-06-12 op int
138 03fcfb79 2021-06-12 op main(void)
139 03fcfb79 2021-06-12 op {
140 03fcfb79 2021-06-12 op 	struct fcgi_header	 hdr;
141 03fcfb79 2021-06-12 op 	struct fcgi_end_req_body end;
142 03fcfb79 2021-06-12 op 	const char		*msg;
143 03fcfb79 2021-06-12 op 	size_t			 len;
144 03fcfb79 2021-06-12 op 
145 03fcfb79 2021-06-12 op 	msg = "20 text/gemini\r\n# Hello, world!\n";
146 03fcfb79 2021-06-12 op 	len = strlen(msg);
147 03fcfb79 2021-06-12 op 
148 03fcfb79 2021-06-12 op 	for (;;) {
149 03fcfb79 2021-06-12 op 		warnx("waiting for a request");
150 03fcfb79 2021-06-12 op 		assert_record(FCGI_BEGIN_REQUEST);
151 03fcfb79 2021-06-12 op 
152 03fcfb79 2021-06-12 op 		/* read params */
153 03fcfb79 2021-06-12 op 		for (;;) {
154 03fcfb79 2021-06-12 op 			read_header(&hdr);
155 03fcfb79 2021-06-12 op 
156 03fcfb79 2021-06-12 op 			consume(0, SUM(hdr.content_len1, hdr.content_len0));
157 03fcfb79 2021-06-12 op 			consume(0, hdr.padding);
158 03fcfb79 2021-06-12 op 
159 03fcfb79 2021-06-12 op 			if (hdr.type != FCGI_PARAMS)
160 03fcfb79 2021-06-12 op 				errx(1, "got %d; expecting PARAMS", hdr.type);
161 03fcfb79 2021-06-12 op 
162 03fcfb79 2021-06-12 op 			if (hdr.content_len0 == 0 &&
163 03fcfb79 2021-06-12 op 			    hdr.content_len1 == 0 &&
164 03fcfb79 2021-06-12 op 			    hdr.padding == 0)
165 03fcfb79 2021-06-12 op 				break;
166 03fcfb79 2021-06-12 op 		}
167 03fcfb79 2021-06-12 op 
168 03fcfb79 2021-06-12 op 		assert_record(FCGI_STDIN);
169 03fcfb79 2021-06-12 op 
170 03fcfb79 2021-06-12 op 		warnx("sending the response");
171 03fcfb79 2021-06-12 op 
172 03fcfb79 2021-06-12 op 		prepare_header(&hdr, FCGI_STDOUT, 1, len, 0);
173 03fcfb79 2021-06-12 op 		write(0, &hdr, sizeof(hdr));
174 03fcfb79 2021-06-12 op 		write(0, msg, len);
175 03fcfb79 2021-06-12 op 
176 03fcfb79 2021-06-12 op 		warnx("closing the request");
177 03fcfb79 2021-06-12 op 
178 03fcfb79 2021-06-12 op 		prepare_header(&hdr, FCGI_END_REQUEST, 1, sizeof(end), 0);
179 03fcfb79 2021-06-12 op 		write(0, &hdr, sizeof(hdr));
180 03fcfb79 2021-06-12 op 		memset(&end, 0, sizeof(end));
181 03fcfb79 2021-06-12 op 		write(0, &end, sizeof(end));
182 03fcfb79 2021-06-12 op 	}
183 03fcfb79 2021-06-12 op }