/*************************************************************************** * http.h * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2019 Insecure.Com LLC ("The Nmap * * Project"). Nmap is also a registered trademark of the Nmap Project. * * This program is free software; you may redistribute and/or modify it * * under the terms of the GNU General Public License as published by the * * Free Software Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE * * CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your * * right to use, modify, and redistribute this software under certain * * conditions. If you wish to embed Nmap technology into proprietary * * software, we sell alternative licenses (contact sales@nmap.com). * * Dozens of software vendors already license Nmap technology such as * * host discovery, port scanning, OS detection, version detection, and * * the Nmap Scripting Engine. * * * * Note that the GPL places important restrictions on "derivative works", * * yet it does not provide a detailed definition of that term. To avoid * * misunderstandings, we interpret that term as broadly as copyright law * * allows. For example, we consider an application to constitute a * * derivative work for the purpose of this license if it does any of the * * following with any software or content covered by this license * * ("Covered Software"): * * * * o Integrates source code from Covered Software. * * * * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db * * or nmap-service-probes. * * * * o Is designed specifically to execute Covered Software and parse the * * results (as opposed to typical shell or execution-menu apps, which will * * execute anything you tell them to). * * * * o Includes Covered Software in a proprietary executable installer. The * * installers produced by InstallShield are an example of this. Including * * Nmap with other software in compressed or archival form does not * * trigger this provision, provided appropriate open source decompression * * or de-archiving software is widely available for no charge. For the * * purposes of this license, an installer is considered to include Covered * * Software even if it actually retrieves a copy of Covered Software from * * another source during runtime (such as by downloading it from the * * Internet). * * * * o Links (statically or dynamically) to a library which does any of the * * above. * * * * o Executes a helper program, module, or script to do any of the above. * * * * This list is not exclusive, but is meant to clarify our interpretation * * of derived works with some common examples. Other people may interpret * * the plain GPL differently, so we consider this a special exception to * * the GPL that we apply to Covered Software. Works which meet any of * * these conditions must conform to all of the terms of this license, * * particularly including the GPL Section 3 requirements of providing * * source code and allowing free redistribution of the work as a whole. * * * * As another special exception to the GPL terms, the Nmap Project grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included docs/licenses/OpenSSL.txt file, and distribute * * linked combinations including the two. * * * * The Nmap Project has permission to redistribute Npcap, a packet * * capturing driver and library for the Microsoft Windows platform. * * Npcap is a separate work with it's own license rather than this Nmap * * license. Since the Npcap license does not permit redistribution * * without special permission, our Nmap Windows binary packages which * * contain Npcap may not be redistributed without special permission. * * * * Any redistribution of Covered Software, including any derived works, * * must obey and carry forward all of the terms of this license, including * * obeying all GPL rules and restrictions. For example, source code of * * the whole work must be provided and free redistribution must be * * allowed. All GPL references to "this License", are to be treated as * * including the terms and conditions of this license text as well. * * * * Because this license imposes special exceptions to the GPL, Covered * * Work may not be combined (even as part of a larger work) with plain GPL * * software. The terms, conditions, and exceptions of this license must * * be included as well. This license is incompatible with some other open * * source licenses as well. In some cases we can relicense portions of * * Nmap or grant special permissions to use it in other open source * * software. Please contact fyodor@nmap.org with any such requests. * * Similarly, we don't incorporate incompatible open source software into * * Covered Software without special permission from the copyright holders. * * * * If you have any questions about the licensing restrictions on using * * Nmap in other works, we are happy to help. As mentioned above, we also * * offer an alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to dozens * * of software vendors, and generally include a perpetual license as well * * as providing support and updates. They also fund the continued * * development of Nmap. Please email sales@nmap.com for further * * information. * * * * If you have received a written license agreement or contract for * * Covered Software stating terms other than these, you may choose to use * * and redistribute Covered Software under those terms instead of these. * * * * 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 send your changes * * to the dev@nmap.org mailing list for possible incorporation into the * * main distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, or checking them into the Nmap * * source code repository, it is understood (unless you specify * * otherwise) that you are offering the Nmap Project the unlimited, * * non-exclusive right to reuse, modify, and relicense the code. Nmap * * will always be available Open Source, but this is important because * * the inability to relicense code has caused devastating problems for * * other Free Software projects (such as KDE and NASM). We also * * occasionally relicense the code to third parties as discussed above. * * If you wish to specify special license conditions of your * * contributions, just say so when you send them. * * * * This program 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. See the Nmap * * license file for more details (it's in a COPYING file included with * * Nmap, and also available from https://svn.nmap.org/nmap/COPYING) * * * ***************************************************************************/ /* $Id$ */ #ifndef _HTTP_H #define _HTTP_H #include "ncat_config.h" #include "util.h" #include #include /* 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