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/***************************************************************************
* http.h *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* Source is provided to this software because we believe users have a
* right to know exactly what a program is going to do before they run it.
* This also allows you to audit the software for security holes.
*
* Source code also allows you to port Nmap to new platforms, fix bugs, and add
* new features. You are highly encouraged to submit your changes as a Github PR
* or by email to the dev@nmap.org mailing list for possible incorporation into
* the main distribution. Unless you specify otherwise, it is understood that
* you are offering us very broad rights to use your submissions as described in
* the Nmap Public Source License Contributor Agreement. This is important
* because we fund the project by selling licenses with various terms, and also
* because the inability to relicense code has caused devastating problems for
* other Free Software projects (such as KDE and NASM).
*
* The free version of Nmap is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
/* $Id$ */
#ifndef _HTTP_H
#define _HTTP_H
#include "ncat_config.h"
#include "util.h"
#include <stdio.h>
#include <stdlib.h>
/* This is an abstraction over a socket (really a struct fdinfo) that provides
rudimentary buffering. It is useful for the line-oriented parts of HTTP. */
struct socket_buffer {
struct fdinfo fdn;
char buffer[BUFSIZ];
char *p;
char *end;
};
void socket_buffer_init(struct socket_buffer *buf, int sd);
int socket_buffer_read(struct socket_buffer *buf, char *out, size_t size);
char *socket_buffer_readline(struct socket_buffer *buf, size_t *n, size_t maxlen);
int socket_buffer_readcount(struct socket_buffer *buf, char *out, size_t size);
char *socket_buffer_remainder(struct socket_buffer *buf, size_t *len);
/* A broken-down URI as defined in RFC 3986, except that the query and fragment
parts are included in the path. */
struct uri {
char *scheme;
char *host;
int port;
char *path;
};
void uri_init(struct uri *uri);
void uri_free(struct uri *uri);
struct uri *uri_parse(struct uri *uri, const char *uri_s);
struct uri *uri_parse_authority(struct uri *uri, const char *authority);
enum http_version {
HTTP_09,
HTTP_10,
HTTP_11,
HTTP_UNKNOWN,
};
struct http_header {
char *name;
char *value;
struct http_header *next;
};
struct http_request {
char *method;
struct uri uri;
enum http_version version;
struct http_header *header;
int content_length_set;
unsigned long content_length;
unsigned long bytes_transferred;
};
struct http_response {
enum http_version version;
int code;
char *phrase;
struct http_header *header;
int content_length_set;
unsigned long content_length;
unsigned long bytes_transferred;
};
void http_header_free(struct http_header *header);
char *http_header_get(const struct http_header *header, const char *name);
const struct http_header *http_header_next(const struct http_header *header, const struct http_header *p, const char *name);
char *http_header_get_first(const struct http_header *header, const char *name);
struct http_header *http_header_set(struct http_header *header, const char *name, const char *value);
struct http_header *http_header_remove(struct http_header *header, const char *name);
int http_header_remove_hop_by_hop(struct http_header **header);
char *http_header_to_string(const struct http_header *header, size_t *n);
void http_request_init(struct http_request *request);
void http_request_free(struct http_request *request);
char *http_request_to_string(const struct http_request *request, size_t *n);
void http_response_init(struct http_response *response);
void http_response_free(struct http_response *response);
char *http_response_to_string(const struct http_response *response, size_t *n);
int http_read_header(struct socket_buffer *buf, char **result);
int http_parse_header(struct http_header **result, const char *header);
int http_request_parse_header(struct http_request *request, const char *header);
int http_response_parse_header(struct http_response *response, const char *header);
int http_read_request_line(struct socket_buffer *buf, char **line);
int http_parse_request_line(const char *line, struct http_request *request);
int http_read_status_line(struct socket_buffer *buf, char **line);
int http_parse_status_line(const char *line, struct http_response *response);
int http_parse_status_line_code(const char *line);
enum http_auth_scheme { AUTH_UNKNOWN, AUTH_BASIC, AUTH_DIGEST };
enum http_digest_algorithm { ALGORITHM_MD5, ALGORITHM_UNKNOWN };
enum http_digest_qop { QOP_NONE = 0, QOP_AUTH = 1 << 0, QOP_AUTH_INT = 1 << 1 };
struct http_challenge {
enum http_auth_scheme scheme;
char *realm;
struct {
char *nonce;
char *opaque;
enum http_digest_algorithm algorithm;
/* A bit mask of supported qop values ("auth", "auth-int", etc.). */
unsigned char qop;
} digest;
};
struct http_credentials {
enum http_auth_scheme scheme;
union {
char *basic;
struct {
char *username;
char *realm;
char *nonce;
char *uri;
char *response;
enum http_digest_algorithm algorithm;
enum http_digest_qop qop;
char *nc;
char *cnonce;
} digest;
} u;
};
void http_challenge_init(struct http_challenge *challenge);
void http_challenge_free(struct http_challenge *challenge);
struct http_challenge *http_header_get_proxy_challenge(const struct http_header *header, struct http_challenge *challenge);
void http_credentials_init_basic(struct http_credentials *credentials);
void http_credentials_init_digest(struct http_credentials *credentials);
void http_credentials_free(struct http_credentials *credentials);
struct http_credentials *http_header_get_proxy_credentials(const struct http_header *header, struct http_credentials *credentials);
#if HAVE_HTTP_DIGEST
/* Initialize the server secret used in generating nonces. */
int http_digest_init_secret(void);
int http_digest_nonce_time(const char *nonce, struct timeval *tv);
/* Return a Proxy-Authenticate header. */
char *http_digest_proxy_authenticate(const char *realm, int stale);
/* Return a Proxy-Authorization header answering the given challenge. */
char *http_digest_proxy_authorization(const struct http_challenge *challenge,
const char *username, const char *password,
const char *method, const char *uri);
int http_digest_check_credentials(const char *username, const char *realm,
const char *password, const char *method,
const struct http_credentials *credentials);
#endif
#endif
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