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 cd1ede6d 2023-06-09 op #include <sys/socket.h>
 25 cd1ede6d 2023-06-09 op #include <sys/stat.h>
 26 cd1ede6d 2023-06-09 op #include <sys/un.h>
 27 cd1ede6d 2023-06-09 op 
 28 cd1ede6d 2023-06-09 op #include <errno.h>
 29 03fcfb79 2021-06-12 op #include <stdint.h>
 30 03fcfb79 2021-06-12 op #include <stdio.h>
 31 89c110fe 2021-06-15 op #include <stdlib.h>
 32 03fcfb79 2021-06-12 op #include <string.h>
 33 03fcfb79 2021-06-12 op #include <unistd.h>
 34 03fcfb79 2021-06-12 op 
 35 03fcfb79 2021-06-12 op #define FCGI_VERSION_1	1
 36 03fcfb79 2021-06-12 op 
 37 03fcfb79 2021-06-12 op /* subset of records that matters to us */
 38 03fcfb79 2021-06-12 op #define FCGI_BEGIN_REQUEST	 1
 39 03fcfb79 2021-06-12 op #define FCGI_END_REQUEST	 3
 40 03fcfb79 2021-06-12 op #define FCGI_PARAMS		 4
 41 03fcfb79 2021-06-12 op #define FCGI_STDIN		 5
 42 03fcfb79 2021-06-12 op #define FCGI_STDOUT		 6
 43 03fcfb79 2021-06-12 op 
 44 03fcfb79 2021-06-12 op #define SUM(a, b) (((a) << 8) + (b))
 45 03fcfb79 2021-06-12 op 
 46 03fcfb79 2021-06-12 op struct fcgi_header {
 47 03fcfb79 2021-06-12 op 	uint8_t version;
 48 03fcfb79 2021-06-12 op 	uint8_t type;
 49 03fcfb79 2021-06-12 op 	uint8_t req_id1;
 50 03fcfb79 2021-06-12 op 	uint8_t req_id0;
 51 03fcfb79 2021-06-12 op 	uint8_t content_len1;
 52 03fcfb79 2021-06-12 op 	uint8_t content_len0;
 53 03fcfb79 2021-06-12 op 	uint8_t padding;
 54 03fcfb79 2021-06-12 op 	uint8_t reserved;
 55 03fcfb79 2021-06-12 op };
 56 03fcfb79 2021-06-12 op 
 57 03fcfb79 2021-06-12 op struct fcgi_end_req_body {
 58 03fcfb79 2021-06-12 op 	unsigned char app_status3;
 59 03fcfb79 2021-06-12 op 	unsigned char app_status2;
 60 03fcfb79 2021-06-12 op 	unsigned char app_status1;
 61 03fcfb79 2021-06-12 op 	unsigned char app_status0;
 62 03fcfb79 2021-06-12 op 	unsigned char proto_status;
 63 03fcfb79 2021-06-12 op 	unsigned char reserved[3];
 64 03fcfb79 2021-06-12 op };
 65 03fcfb79 2021-06-12 op 
 66 03fcfb79 2021-06-12 op static int
 67 03fcfb79 2021-06-12 op prepare_header(struct fcgi_header *h, int type, int id, size_t size,
 68 03fcfb79 2021-06-12 op     size_t padding)
 69 03fcfb79 2021-06-12 op {
 70 03fcfb79 2021-06-12 op 	memset(h, 0, sizeof(*h));
 71 03fcfb79 2021-06-12 op 
 72 03fcfb79 2021-06-12 op 	h->version = FCGI_VERSION_1;
 73 03fcfb79 2021-06-12 op         h->type = type;
 74 03fcfb79 2021-06-12 op 	h->req_id1 = (id >> 8);
 75 03fcfb79 2021-06-12 op 	h->req_id0 = (id & 0xFF);
 76 03fcfb79 2021-06-12 op 	h->content_len1 = (size >> 8);
 77 03fcfb79 2021-06-12 op 	h->content_len0 = (size & 0xFF);
 78 03fcfb79 2021-06-12 op 	h->padding = padding;
 79 03fcfb79 2021-06-12 op 
 80 03fcfb79 2021-06-12 op 	return 0;
 81 03fcfb79 2021-06-12 op }
 82 03fcfb79 2021-06-12 op 
 83 cd1ede6d 2023-06-09 op static void
 84 03fcfb79 2021-06-12 op must_read(int sock, void *d, size_t len)
 85 03fcfb79 2021-06-12 op {
 86 03fcfb79 2021-06-12 op 	ssize_t r;
 87 03fcfb79 2021-06-12 op 
 88 cd1ede6d 2023-06-09 op 	while (len > 0) {
 89 03fcfb79 2021-06-12 op 		switch (r = read(sock, d, len)) {
 90 03fcfb79 2021-06-12 op 		case -1:
 91 cd1ede6d 2023-06-09 op 			err(1, "read");
 92 03fcfb79 2021-06-12 op 		case 0:
 93 cd1ede6d 2023-06-09 op 			errx(1, "EOF");
 94 03fcfb79 2021-06-12 op 		default:
 95 03fcfb79 2021-06-12 op 			len -= r;
 96 03fcfb79 2021-06-12 op 			d += r;
 97 03fcfb79 2021-06-12 op 		}
 98 03fcfb79 2021-06-12 op 	}
 99 03fcfb79 2021-06-12 op }
100 03fcfb79 2021-06-12 op 
101 cd1ede6d 2023-06-09 op static void
102 cd1ede6d 2023-06-09 op must_write(int sock, const void *d, size_t len)
103 cd1ede6d 2023-06-09 op {
104 cd1ede6d 2023-06-09 op 	ssize_t w;
105 cd1ede6d 2023-06-09 op 
106 cd1ede6d 2023-06-09 op 	while (len > 0) {
107 cd1ede6d 2023-06-09 op 		switch (w = write(sock, d, len)) {
108 cd1ede6d 2023-06-09 op 		case -1:
109 cd1ede6d 2023-06-09 op 			err(1, "write");
110 cd1ede6d 2023-06-09 op 		case 0:
111 cd1ede6d 2023-06-09 op 			errx(1, "EOF");
112 cd1ede6d 2023-06-09 op 		default:
113 cd1ede6d 2023-06-09 op 			len -= w;
114 cd1ede6d 2023-06-09 op 			d += w;
115 cd1ede6d 2023-06-09 op 		}
116 cd1ede6d 2023-06-09 op 	}
117 cd1ede6d 2023-06-09 op }
118 cd1ede6d 2023-06-09 op 
119 03fcfb79 2021-06-12 op static int
120 03fcfb79 2021-06-12 op consume(int fd, size_t len)
121 03fcfb79 2021-06-12 op {
122 03fcfb79 2021-06-12 op 	size_t	l;
123 03fcfb79 2021-06-12 op 	char	buf[64];
124 03fcfb79 2021-06-12 op 
125 03fcfb79 2021-06-12 op 	while (len != 0) {
126 03fcfb79 2021-06-12 op 		if ((l = len) > sizeof(buf))
127 03fcfb79 2021-06-12 op 			l =  sizeof(buf);
128 cd1ede6d 2023-06-09 op 		must_read(fd, buf, l);
129 03fcfb79 2021-06-12 op 		len -= l;
130 03fcfb79 2021-06-12 op 	}
131 03fcfb79 2021-06-12 op 
132 03fcfb79 2021-06-12 op 	return 1;
133 03fcfb79 2021-06-12 op }
134 03fcfb79 2021-06-12 op 
135 03fcfb79 2021-06-12 op static void
136 cd1ede6d 2023-06-09 op read_header(int fd, struct fcgi_header *hdr)
137 03fcfb79 2021-06-12 op {
138 cd1ede6d 2023-06-09 op 	must_read(fd, hdr, sizeof(*hdr));
139 03fcfb79 2021-06-12 op }
140 03fcfb79 2021-06-12 op 
141 03fcfb79 2021-06-12 op /* read and consume a record of the given type */
142 03fcfb79 2021-06-12 op static void
143 cd1ede6d 2023-06-09 op assert_record(int fd, int type)
144 03fcfb79 2021-06-12 op {
145 03fcfb79 2021-06-12 op 	struct fcgi_header hdr;
146 03fcfb79 2021-06-12 op 
147 cd1ede6d 2023-06-09 op 	read_header(fd, &hdr);
148 03fcfb79 2021-06-12 op 
149 03fcfb79 2021-06-12 op 	if (hdr.type != type)
150 03fcfb79 2021-06-12 op 		errx(1, "expected record type %d; got %d",
151 03fcfb79 2021-06-12 op 		    type, hdr.type);
152 03fcfb79 2021-06-12 op 
153 cd1ede6d 2023-06-09 op 	consume(fd, SUM(hdr.content_len1, hdr.content_len0));
154 cd1ede6d 2023-06-09 op 	consume(fd, hdr.padding);
155 03fcfb79 2021-06-12 op }
156 03fcfb79 2021-06-12 op 
157 03fcfb79 2021-06-12 op int
158 cd1ede6d 2023-06-09 op main(int argc, char **argv)
159 03fcfb79 2021-06-12 op {
160 03fcfb79 2021-06-12 op 	struct fcgi_header	 hdr;
161 03fcfb79 2021-06-12 op 	struct fcgi_end_req_body end;
162 cd1ede6d 2023-06-09 op 	struct sockaddr_un	 sun;
163 cd1ede6d 2023-06-09 op 	const char		*path;
164 03fcfb79 2021-06-12 op 	const char		*msg;
165 03fcfb79 2021-06-12 op 	size_t			 len;
166 cd1ede6d 2023-06-09 op 	int			 ch, sock, s;
167 03fcfb79 2021-06-12 op 
168 cd1ede6d 2023-06-09 op 	msg = "20 text/gemini\r\n# hello from fastcgi!\n";
169 03fcfb79 2021-06-12 op 	len = strlen(msg);
170 03fcfb79 2021-06-12 op 
171 cd1ede6d 2023-06-09 op 	while ((ch = getopt(argc, argv, "")) != -1)
172 cd1ede6d 2023-06-09 op 		errx(1, "wrong usage");
173 cd1ede6d 2023-06-09 op 	argc -= optind;
174 cd1ede6d 2023-06-09 op 	argv += optind;
175 cd1ede6d 2023-06-09 op 	if (argc != 1)
176 cd1ede6d 2023-06-09 op 		errx(1, "wrong usage");
177 cd1ede6d 2023-06-09 op 
178 cd1ede6d 2023-06-09 op 	path = argv[0];
179 cd1ede6d 2023-06-09 op 
180 cd1ede6d 2023-06-09 op 	if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
181 cd1ede6d 2023-06-09 op 		err(1, "socket");
182 cd1ede6d 2023-06-09 op 
183 cd1ede6d 2023-06-09 op 	memset(&sun, 0, sizeof(sun));
184 cd1ede6d 2023-06-09 op 	sun.sun_family = AF_UNIX;
185 cd1ede6d 2023-06-09 op 	(void)strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
186 cd1ede6d 2023-06-09 op 
187 cd1ede6d 2023-06-09 op 	if (unlink(path) == -1 && errno != ENOENT)
188 cd1ede6d 2023-06-09 op 		err(1, "unlink %s", path);
189 cd1ede6d 2023-06-09 op 
190 cd1ede6d 2023-06-09 op 	if (bind(sock, (struct sockaddr *)&sun, sizeof(sun)) == -1)
191 cd1ede6d 2023-06-09 op 		err(1, "bind");
192 cd1ede6d 2023-06-09 op 
193 cd1ede6d 2023-06-09 op 	if (listen(sock, 5) == -1)
194 cd1ede6d 2023-06-09 op 		err(1, "listen");
195 cd1ede6d 2023-06-09 op 
196 03fcfb79 2021-06-12 op 	for (;;) {
197 cd1ede6d 2023-06-09 op 		if ((s = accept(sock, NULL, NULL)) == -1) {
198 cd1ede6d 2023-06-09 op 			warn("retrying; accept failed");
199 cd1ede6d 2023-06-09 op 			continue;
200 cd1ede6d 2023-06-09 op 		}
201 03fcfb79 2021-06-12 op 
202 cd1ede6d 2023-06-09 op 		assert_record(s, FCGI_BEGIN_REQUEST);
203 cd1ede6d 2023-06-09 op 
204 03fcfb79 2021-06-12 op 		/* read params */
205 03fcfb79 2021-06-12 op 		for (;;) {
206 cd1ede6d 2023-06-09 op 			read_header(s, &hdr);
207 03fcfb79 2021-06-12 op 
208 cd1ede6d 2023-06-09 op 			consume(s, SUM(hdr.content_len1, hdr.content_len0));
209 cd1ede6d 2023-06-09 op 			consume(s, hdr.padding);
210 03fcfb79 2021-06-12 op 
211 03fcfb79 2021-06-12 op 			if (hdr.type != FCGI_PARAMS)
212 03fcfb79 2021-06-12 op 				errx(1, "got %d; expecting PARAMS", hdr.type);
213 03fcfb79 2021-06-12 op 
214 03fcfb79 2021-06-12 op 			if (hdr.content_len0 == 0 &&
215 03fcfb79 2021-06-12 op 			    hdr.content_len1 == 0 &&
216 03fcfb79 2021-06-12 op 			    hdr.padding == 0)
217 03fcfb79 2021-06-12 op 				break;
218 03fcfb79 2021-06-12 op 		}
219 03fcfb79 2021-06-12 op 
220 cd1ede6d 2023-06-09 op 		assert_record(s, FCGI_STDIN);
221 03fcfb79 2021-06-12 op 
222 03fcfb79 2021-06-12 op 		prepare_header(&hdr, FCGI_STDOUT, 1, len, 0);
223 cd1ede6d 2023-06-09 op 		must_write(s, &hdr, sizeof(hdr));
224 cd1ede6d 2023-06-09 op 		must_write(s, msg, len);
225 03fcfb79 2021-06-12 op 
226 03fcfb79 2021-06-12 op 		prepare_header(&hdr, FCGI_END_REQUEST, 1, sizeof(end), 0);
227 cd1ede6d 2023-06-09 op 		write(s, &hdr, sizeof(hdr));
228 03fcfb79 2021-06-12 op 		memset(&end, 0, sizeof(end));
229 cd1ede6d 2023-06-09 op 		write(s, &end, sizeof(end));
230 03fcfb79 2021-06-12 op 	}
231 03fcfb79 2021-06-12 op }