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Implement RFC 8555 "Automatic Certificate Management Environment
(ACME)" to be able to talk to the v02 Let's Encrypt API.

With this acme-client(1) will no longer be able to talk to the v01
API. Users must change the api url in /etc/acme-client.conf to
https://acme-v02.api.letsencrypt.org/directory
Existing accounts (and certs of course) stay valid and after the url
change acme-client will be able to renew certs.

Tested by Renaud Allard and benno
Input & OK benno

/*	$Id: http.h,v 1.8 2019/06/07 08:07:52 florian Exp $ */
/*
 * Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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 AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
 */
#ifndef HTTP_H
#define HTTP_H

struct	source {
	int	 family; /* 4 (PF_INET) or 6 (PF_INET6) */
	char	*ip; /* IPV4 or IPV6 address */
};

struct	http;

/*
 * Write and read callbacks to allow HTTP and HTTPS.
 * Both of these return the number of bytes read (or written) or -1 on
 * failure.
 * 0 bytes read means that the connection has closed.
 */
typedef	ssize_t (*writefp)(const void *, size_t, const struct http *);
typedef	ssize_t (*readfp)(char *, size_t, const struct http *);

/*
 * HTTP/S header pair.
 * There's also a cooked-up pair, "Status", with the status code.
 * Both strings are NUL-terminated.
 */
struct	httphead {
	const char	*key;
	const char	*val;
};

/*
 * Grab all information from a transfer.
 * DO NOT free any parts of this, and editing the parts (e.g., changing
 * the underlying strings) will persist; so in short, don't.
 * All of these values will be set upon http_get() success.
 */
struct	httpget {
	struct httpxfer	*xfer; /* underlying transfer */
	struct http	*http; /* underlying connection */
	int		 code; /* return code */
	struct httphead	*head; /* headers */
	size_t		 headsz; /* number of headers */
	char		*headpart; /* header buffer */
	size_t		 headpartsz; /* size of headpart */
	char		*bodypart; /* body buffer */
	size_t		 bodypartsz; /* size of bodypart */
};

int		 http_init(void);

/* Convenience functions. */
struct httpget	*http_get(const struct source *, size_t,
			const char *, short, const char *, int,
			const void *, size_t);
void		 http_get_free(struct httpget *);

/* Allocation and release. */
struct http	*http_alloc(const struct source *, size_t,
			const char *, short, const char *);
void		 http_free(struct http *);
struct httpxfer	*http_open(const struct http *, int, const void *, size_t);
void		 http_close(struct httpxfer *);
void		 http_disconnect(struct http *);

/* Access. */
char		*http_head_read(const struct http *,
			struct httpxfer *, size_t *);
struct httphead	*http_head_parse(const struct http *,
			struct httpxfer *, size_t *);
char		*http_body_read(const struct http *,
			struct httpxfer *, size_t *);
int		 http_head_status(const struct http *,
			struct httphead *, size_t);
struct httphead	*http_head_get(const char *,
			struct httphead *, size_t);

#endif /* HTTP_H */